| 1 | /* $Cambridge: exim/src/src/expand.c,v 1.2 2004/10/19 13:40:39 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2004 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | |
| 11 | /* Functions for handling string expansion. */ |
| 12 | |
| 13 | |
| 14 | #include "exim.h" |
| 15 | |
| 16 | #ifdef STAND_ALONE |
| 17 | #ifndef SUPPORT_CRYPTEQ |
| 18 | #define SUPPORT_CRYPTEQ |
| 19 | #endif |
| 20 | #endif |
| 21 | |
| 22 | #ifdef SUPPORT_CRYPTEQ |
| 23 | #ifdef CRYPT_H |
| 24 | #include <crypt.h> |
| 25 | #endif |
| 26 | #ifndef HAVE_CRYPT16 |
| 27 | extern char* crypt16(char*, char*); |
| 28 | #endif |
| 29 | #endif |
| 30 | |
| 31 | #ifdef LOOKUP_LDAP |
| 32 | #include "lookups/ldap.h" |
| 33 | #endif |
| 34 | |
| 35 | |
| 36 | |
| 37 | /* Recursively called function */ |
| 38 | |
| 39 | static uschar *expand_string_internal(uschar *, BOOL, uschar **, BOOL); |
| 40 | |
| 41 | |
| 42 | |
| 43 | /************************************************* |
| 44 | * Local statics and tables * |
| 45 | *************************************************/ |
| 46 | |
| 47 | /* Table of item names, and corresponding switch numbers. The names must be in |
| 48 | alphabetical order. */ |
| 49 | |
| 50 | static uschar *item_table[] = { |
| 51 | US"extract", |
| 52 | US"hash", |
| 53 | US"hmac", |
| 54 | US"if", |
| 55 | US"length", |
| 56 | US"lookup", |
| 57 | US"nhash", |
| 58 | #ifdef EXIM_PERL |
| 59 | US"perl", |
| 60 | #endif |
| 61 | US"readfile", |
| 62 | US"readsocket", |
| 63 | US"run", |
| 64 | US"sg", |
| 65 | US"substr", |
| 66 | US"tr" }; |
| 67 | |
| 68 | enum { |
| 69 | EITEM_EXTRACT, |
| 70 | EITEM_HASH, |
| 71 | EITEM_HMAC, |
| 72 | EITEM_IF, |
| 73 | EITEM_LENGTH, |
| 74 | EITEM_LOOKUP, |
| 75 | EITEM_NHASH, |
| 76 | #ifdef EXIM_PERL |
| 77 | EITEM_PERL, |
| 78 | #endif |
| 79 | EITEM_READFILE, |
| 80 | EITEM_READSOCK, |
| 81 | EITEM_RUN, |
| 82 | EITEM_SG, |
| 83 | EITEM_SUBSTR, |
| 84 | EITEM_TR }; |
| 85 | |
| 86 | /* Tables of operator names, and corresponding switch numbers. The names must be |
| 87 | in alphabetical order. There are two tables, because underscore is used in some |
| 88 | cases to introduce arguments, whereas for other it is part of the name. This is |
| 89 | an historical mis-design. */ |
| 90 | |
| 91 | static uschar *op_table_underscore[] = { |
| 92 | US"from_utf8", |
| 93 | US"local_part", |
| 94 | US"quote_local_part", |
| 95 | US"time_interval"}; |
| 96 | |
| 97 | enum { |
| 98 | EOP_FROM_UTF8, |
| 99 | EOP_LOCAL_PART, |
| 100 | EOP_QUOTE_LOCAL_PART, |
| 101 | EOP_TIME_INTERVAL }; |
| 102 | |
| 103 | static uschar *op_table_main[] = { |
| 104 | US"address", |
| 105 | US"base62", |
| 106 | US"base62d", |
| 107 | US"domain", |
| 108 | US"escape", |
| 109 | US"eval", |
| 110 | US"eval10", |
| 111 | US"expand", |
| 112 | US"h", |
| 113 | US"hash", |
| 114 | US"hex2b64", |
| 115 | US"l", |
| 116 | US"lc", |
| 117 | US"length", |
| 118 | US"mask", |
| 119 | US"md5", |
| 120 | US"nh", |
| 121 | US"nhash", |
| 122 | US"quote", |
| 123 | US"rfc2047", |
| 124 | US"rxquote", |
| 125 | US"s", |
| 126 | US"sha1", |
| 127 | US"stat", |
| 128 | US"str2b64", |
| 129 | US"strlen", |
| 130 | US"substr", |
| 131 | US"uc" }; |
| 132 | |
| 133 | enum { |
| 134 | EOP_ADDRESS = sizeof(op_table_underscore)/sizeof(uschar *), |
| 135 | EOP_BASE62, |
| 136 | EOP_BASE62D, |
| 137 | EOP_DOMAIN, |
| 138 | EOP_ESCAPE, |
| 139 | EOP_EVAL, |
| 140 | EOP_EVAL10, |
| 141 | EOP_EXPAND, |
| 142 | EOP_H, |
| 143 | EOP_HASH, |
| 144 | EOP_HEX2B64, |
| 145 | EOP_L, |
| 146 | EOP_LC, |
| 147 | EOP_LENGTH, |
| 148 | EOP_MASK, |
| 149 | EOP_MD5, |
| 150 | EOP_NH, |
| 151 | EOP_NHASH, |
| 152 | EOP_QUOTE, |
| 153 | EOP_RFC2047, |
| 154 | EOP_RXQUOTE, |
| 155 | EOP_S, |
| 156 | EOP_SHA1, |
| 157 | EOP_STAT, |
| 158 | EOP_STR2B64, |
| 159 | EOP_STRLEN, |
| 160 | EOP_SUBSTR, |
| 161 | EOP_UC }; |
| 162 | |
| 163 | |
| 164 | /* Table of condition names, and corresponding switch numbers. The names must |
| 165 | be in alphabetical order. */ |
| 166 | |
| 167 | static uschar *cond_table[] = { |
| 168 | US"<", |
| 169 | US"<=", |
| 170 | US"=", |
| 171 | US"==", /* Backward compatibility */ |
| 172 | US">", |
| 173 | US">=", |
| 174 | US"and", |
| 175 | US"crypteq", |
| 176 | US"def", |
| 177 | US"eq", |
| 178 | US"eqi", |
| 179 | US"exists", |
| 180 | US"first_delivery", |
| 181 | US"ge", |
| 182 | US"gei", |
| 183 | US"gt", |
| 184 | US"gti", |
| 185 | US"isip", |
| 186 | US"isip4", |
| 187 | US"isip6", |
| 188 | US"ldapauth", |
| 189 | US"le", |
| 190 | US"lei", |
| 191 | US"lt", |
| 192 | US"lti", |
| 193 | US"match", |
| 194 | US"match_address", |
| 195 | US"match_domain", |
| 196 | US"match_local_part", |
| 197 | US"or", |
| 198 | US"pam", |
| 199 | US"pwcheck", |
| 200 | US"queue_running", |
| 201 | US"radius", |
| 202 | US"saslauthd" |
| 203 | }; |
| 204 | |
| 205 | enum { |
| 206 | ECOND_NUM_L, |
| 207 | ECOND_NUM_LE, |
| 208 | ECOND_NUM_E, |
| 209 | ECOND_NUM_EE, |
| 210 | ECOND_NUM_G, |
| 211 | ECOND_NUM_GE, |
| 212 | ECOND_AND, |
| 213 | ECOND_CRYPTEQ, |
| 214 | ECOND_DEF, |
| 215 | ECOND_STR_EQ, |
| 216 | ECOND_STR_EQI, |
| 217 | ECOND_EXISTS, |
| 218 | ECOND_FIRST_DELIVERY, |
| 219 | ECOND_STR_GE, |
| 220 | ECOND_STR_GEI, |
| 221 | ECOND_STR_GT, |
| 222 | ECOND_STR_GTI, |
| 223 | ECOND_ISIP, |
| 224 | ECOND_ISIP4, |
| 225 | ECOND_ISIP6, |
| 226 | ECOND_LDAPAUTH, |
| 227 | ECOND_STR_LE, |
| 228 | ECOND_STR_LEI, |
| 229 | ECOND_STR_LT, |
| 230 | ECOND_STR_LTI, |
| 231 | ECOND_MATCH, |
| 232 | ECOND_MATCH_ADDRESS, |
| 233 | ECOND_MATCH_DOMAIN, |
| 234 | ECOND_MATCH_LOCAL_PART, |
| 235 | ECOND_OR, |
| 236 | ECOND_PAM, |
| 237 | ECOND_PWCHECK, |
| 238 | ECOND_QUEUE_RUNNING, |
| 239 | ECOND_RADIUS, |
| 240 | ECOND_SASLAUTHD |
| 241 | }; |
| 242 | |
| 243 | |
| 244 | /* Type for main variable table */ |
| 245 | |
| 246 | typedef struct { |
| 247 | char *name; |
| 248 | int type; |
| 249 | void *value; |
| 250 | } var_entry; |
| 251 | |
| 252 | /* Type for entries pointing to address/length pairs. Not currently |
| 253 | in use. */ |
| 254 | |
| 255 | typedef struct { |
| 256 | uschar **address; |
| 257 | int *length; |
| 258 | } alblock; |
| 259 | |
| 260 | /* Types of table entry */ |
| 261 | |
| 262 | enum { |
| 263 | vtype_int, /* value is address of int */ |
| 264 | vtype_filter_int, /* ditto, but recognized only when filtering */ |
| 265 | vtype_ino, /* value is address of ino_t (not always an int) */ |
| 266 | vtype_uid, /* value is address of uid_t (not always an int) */ |
| 267 | vtype_gid, /* value is address of gid_t (not always an int) */ |
| 268 | vtype_stringptr, /* value is address of pointer to string */ |
| 269 | vtype_msgbody, /* as stringptr, but read when first required */ |
| 270 | vtype_msgbody_end, /* ditto, the end of the message */ |
| 271 | vtype_msgheaders, /* the message's headers */ |
| 272 | vtype_localpart, /* extract local part from string */ |
| 273 | vtype_domain, /* extract domain from string */ |
| 274 | vtype_recipients, /* extract recipients from recipients list */ |
| 275 | /* (enabled only during system filtering */ |
| 276 | vtype_todbsdin, /* value not used; generate BSD inbox tod */ |
| 277 | vtype_tode, /* value not used; generate tod in epoch format */ |
| 278 | vtype_todf, /* value not used; generate full tod */ |
| 279 | vtype_todl, /* value not used; generate log tod */ |
| 280 | vtype_todlf, /* value not used; generate log file datestamp tod */ |
| 281 | vtype_todzone, /* value not used; generate time zone only */ |
| 282 | vtype_todzulu, /* value not used; generate zulu tod */ |
| 283 | vtype_reply, /* value not used; get reply from headers */ |
| 284 | vtype_pid, /* value not used; result is pid */ |
| 285 | vtype_host_lookup, /* value not used; get host name */ |
| 286 | vtype_load_avg /* value not used; result is int from os_getloadavg */ |
| 287 | }; |
| 288 | |
| 289 | /* This table must be kept in alphabetical order. */ |
| 290 | |
| 291 | static var_entry var_table[] = { |
| 292 | { "acl_c0", vtype_stringptr, &acl_var[0] }, |
| 293 | { "acl_c1", vtype_stringptr, &acl_var[1] }, |
| 294 | { "acl_c2", vtype_stringptr, &acl_var[2] }, |
| 295 | { "acl_c3", vtype_stringptr, &acl_var[3] }, |
| 296 | { "acl_c4", vtype_stringptr, &acl_var[4] }, |
| 297 | { "acl_c5", vtype_stringptr, &acl_var[5] }, |
| 298 | { "acl_c6", vtype_stringptr, &acl_var[6] }, |
| 299 | { "acl_c7", vtype_stringptr, &acl_var[7] }, |
| 300 | { "acl_c8", vtype_stringptr, &acl_var[8] }, |
| 301 | { "acl_c9", vtype_stringptr, &acl_var[9] }, |
| 302 | { "acl_m0", vtype_stringptr, &acl_var[10] }, |
| 303 | { "acl_m1", vtype_stringptr, &acl_var[11] }, |
| 304 | { "acl_m2", vtype_stringptr, &acl_var[12] }, |
| 305 | { "acl_m3", vtype_stringptr, &acl_var[13] }, |
| 306 | { "acl_m4", vtype_stringptr, &acl_var[14] }, |
| 307 | { "acl_m5", vtype_stringptr, &acl_var[15] }, |
| 308 | { "acl_m6", vtype_stringptr, &acl_var[16] }, |
| 309 | { "acl_m7", vtype_stringptr, &acl_var[17] }, |
| 310 | { "acl_m8", vtype_stringptr, &acl_var[18] }, |
| 311 | { "acl_m9", vtype_stringptr, &acl_var[19] }, |
| 312 | { "acl_verify_message", vtype_stringptr, &acl_verify_message }, |
| 313 | { "address_data", vtype_stringptr, &deliver_address_data }, |
| 314 | { "address_file", vtype_stringptr, &address_file }, |
| 315 | { "address_pipe", vtype_stringptr, &address_pipe }, |
| 316 | { "authenticated_id", vtype_stringptr, &authenticated_id }, |
| 317 | { "authenticated_sender",vtype_stringptr, &authenticated_sender }, |
| 318 | { "authentication_failed",vtype_int, &authentication_failed }, |
| 319 | { "body_linecount", vtype_int, &body_linecount }, |
| 320 | { "body_zerocount", vtype_int, &body_zerocount }, |
| 321 | { "bounce_recipient", vtype_stringptr, &bounce_recipient }, |
| 322 | { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit }, |
| 323 | { "caller_gid", vtype_gid, &real_gid }, |
| 324 | { "caller_uid", vtype_uid, &real_uid }, |
| 325 | { "compile_date", vtype_stringptr, &version_date }, |
| 326 | { "compile_number", vtype_stringptr, &version_cnumber }, |
| 327 | { "dnslist_domain", vtype_stringptr, &dnslist_domain }, |
| 328 | { "dnslist_text", vtype_stringptr, &dnslist_text }, |
| 329 | { "dnslist_value", vtype_stringptr, &dnslist_value }, |
| 330 | { "domain", vtype_stringptr, &deliver_domain }, |
| 331 | { "domain_data", vtype_stringptr, &deliver_domain_data }, |
| 332 | { "exim_gid", vtype_gid, &exim_gid }, |
| 333 | { "exim_path", vtype_stringptr, &exim_path }, |
| 334 | { "exim_uid", vtype_uid, &exim_uid }, |
| 335 | { "home", vtype_stringptr, &deliver_home }, |
| 336 | { "host", vtype_stringptr, &deliver_host }, |
| 337 | { "host_address", vtype_stringptr, &deliver_host_address }, |
| 338 | { "host_data", vtype_stringptr, &host_data }, |
| 339 | { "host_lookup_failed", vtype_int, &host_lookup_failed }, |
| 340 | { "inode", vtype_ino, &deliver_inode }, |
| 341 | { "interface_address", vtype_stringptr, &interface_address }, |
| 342 | { "interface_port", vtype_int, &interface_port }, |
| 343 | #ifdef LOOKUP_LDAP |
| 344 | { "ldap_dn", vtype_stringptr, &eldap_dn }, |
| 345 | #endif |
| 346 | { "load_average", vtype_load_avg, NULL }, |
| 347 | { "local_part", vtype_stringptr, &deliver_localpart }, |
| 348 | { "local_part_data", vtype_stringptr, &deliver_localpart_data }, |
| 349 | { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix }, |
| 350 | { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix }, |
| 351 | { "local_scan_data", vtype_stringptr, &local_scan_data }, |
| 352 | { "local_user_gid", vtype_gid, &local_user_gid }, |
| 353 | { "local_user_uid", vtype_uid, &local_user_uid }, |
| 354 | { "localhost_number", vtype_int, &host_number }, |
| 355 | { "mailstore_basename", vtype_stringptr, &mailstore_basename }, |
| 356 | { "message_age", vtype_int, &message_age }, |
| 357 | { "message_body", vtype_msgbody, &message_body }, |
| 358 | { "message_body_end", vtype_msgbody_end, &message_body_end }, |
| 359 | { "message_body_size", vtype_int, &message_body_size }, |
| 360 | { "message_headers", vtype_msgheaders, NULL }, |
| 361 | { "message_id", vtype_stringptr, &message_id }, |
| 362 | { "message_size", vtype_int, &message_size }, |
| 363 | { "n0", vtype_filter_int, &filter_n[0] }, |
| 364 | { "n1", vtype_filter_int, &filter_n[1] }, |
| 365 | { "n2", vtype_filter_int, &filter_n[2] }, |
| 366 | { "n3", vtype_filter_int, &filter_n[3] }, |
| 367 | { "n4", vtype_filter_int, &filter_n[4] }, |
| 368 | { "n5", vtype_filter_int, &filter_n[5] }, |
| 369 | { "n6", vtype_filter_int, &filter_n[6] }, |
| 370 | { "n7", vtype_filter_int, &filter_n[7] }, |
| 371 | { "n8", vtype_filter_int, &filter_n[8] }, |
| 372 | { "n9", vtype_filter_int, &filter_n[9] }, |
| 373 | { "original_domain", vtype_stringptr, &deliver_domain_orig }, |
| 374 | { "original_local_part", vtype_stringptr, &deliver_localpart_orig }, |
| 375 | { "originator_gid", vtype_gid, &originator_gid }, |
| 376 | { "originator_uid", vtype_uid, &originator_uid }, |
| 377 | { "parent_domain", vtype_stringptr, &deliver_domain_parent }, |
| 378 | { "parent_local_part", vtype_stringptr, &deliver_localpart_parent }, |
| 379 | { "pid", vtype_pid, NULL }, |
| 380 | { "primary_hostname", vtype_stringptr, &primary_hostname }, |
| 381 | { "qualify_domain", vtype_stringptr, &qualify_domain_sender }, |
| 382 | { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient }, |
| 383 | { "rcpt_count", vtype_int, &rcpt_count }, |
| 384 | { "rcpt_defer_count", vtype_int, &rcpt_defer_count }, |
| 385 | { "rcpt_fail_count", vtype_int, &rcpt_fail_count }, |
| 386 | { "received_count", vtype_int, &received_count }, |
| 387 | { "received_for", vtype_stringptr, &received_for }, |
| 388 | { "received_protocol", vtype_stringptr, &received_protocol }, |
| 389 | { "recipient_data", vtype_stringptr, &recipient_data }, |
| 390 | { "recipients", vtype_recipients, NULL }, |
| 391 | { "recipients_count", vtype_int, &recipients_count }, |
| 392 | { "reply_address", vtype_reply, NULL }, |
| 393 | { "return_path", vtype_stringptr, &return_path }, |
| 394 | { "return_size_limit", vtype_int, &bounce_return_size_limit }, |
| 395 | { "runrc", vtype_int, &runrc }, |
| 396 | { "self_hostname", vtype_stringptr, &self_hostname }, |
| 397 | { "sender_address", vtype_stringptr, &sender_address }, |
| 398 | { "sender_address_data", vtype_stringptr, &sender_address_data }, |
| 399 | { "sender_address_domain", vtype_domain, &sender_address }, |
| 400 | { "sender_address_local_part", vtype_localpart, &sender_address }, |
| 401 | { "sender_data", vtype_stringptr, &sender_data }, |
| 402 | { "sender_fullhost", vtype_stringptr, &sender_fullhost }, |
| 403 | { "sender_helo_name", vtype_stringptr, &sender_helo_name }, |
| 404 | { "sender_host_address", vtype_stringptr, &sender_host_address }, |
| 405 | { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated }, |
| 406 | { "sender_host_name", vtype_host_lookup, NULL }, |
| 407 | { "sender_host_port", vtype_int, &sender_host_port }, |
| 408 | { "sender_ident", vtype_stringptr, &sender_ident }, |
| 409 | { "sender_rcvhost", vtype_stringptr, &sender_rcvhost }, |
| 410 | { "smtp_command_argument", vtype_stringptr, &smtp_command_argument }, |
| 411 | { "sn0", vtype_filter_int, &filter_sn[0] }, |
| 412 | { "sn1", vtype_filter_int, &filter_sn[1] }, |
| 413 | { "sn2", vtype_filter_int, &filter_sn[2] }, |
| 414 | { "sn3", vtype_filter_int, &filter_sn[3] }, |
| 415 | { "sn4", vtype_filter_int, &filter_sn[4] }, |
| 416 | { "sn5", vtype_filter_int, &filter_sn[5] }, |
| 417 | { "sn6", vtype_filter_int, &filter_sn[6] }, |
| 418 | { "sn7", vtype_filter_int, &filter_sn[7] }, |
| 419 | { "sn8", vtype_filter_int, &filter_sn[8] }, |
| 420 | { "sn9", vtype_filter_int, &filter_sn[9] }, |
| 421 | { "spool_directory", vtype_stringptr, &spool_directory }, |
| 422 | { "thisaddress", vtype_stringptr, &filter_thisaddress }, |
| 423 | { "tls_certificate_verified", vtype_int, &tls_certificate_verified }, |
| 424 | { "tls_cipher", vtype_stringptr, &tls_cipher }, |
| 425 | { "tls_peerdn", vtype_stringptr, &tls_peerdn }, |
| 426 | { "tod_bsdinbox", vtype_todbsdin, NULL }, |
| 427 | { "tod_epoch", vtype_tode, NULL }, |
| 428 | { "tod_full", vtype_todf, NULL }, |
| 429 | { "tod_log", vtype_todl, NULL }, |
| 430 | { "tod_logfile", vtype_todlf, NULL }, |
| 431 | { "tod_zone", vtype_todzone, NULL }, |
| 432 | { "tod_zulu", vtype_todzulu, NULL }, |
| 433 | { "value", vtype_stringptr, &lookup_value }, |
| 434 | { "version_number", vtype_stringptr, &version_string }, |
| 435 | { "warn_message_delay", vtype_stringptr, &warnmsg_delay }, |
| 436 | { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients }, |
| 437 | { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients }, |
| 438 | { "warnmsg_delay", vtype_stringptr, &warnmsg_delay }, |
| 439 | { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients }, |
| 440 | { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients } |
| 441 | }; |
| 442 | |
| 443 | static int var_table_size = sizeof(var_table)/sizeof(var_entry); |
| 444 | static uschar var_buffer[256]; |
| 445 | static BOOL malformed_header; |
| 446 | |
| 447 | /* For textual hashes */ |
| 448 | |
| 449 | static char *hashcodes = "abcdefghijklmnopqrtsuvwxyz" |
| 450 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 451 | "0123456789"; |
| 452 | |
| 453 | enum { HMAC_MD5, HMAC_SHA1 }; |
| 454 | |
| 455 | /* For numeric hashes */ |
| 456 | |
| 457 | static unsigned int prime[] = { |
| 458 | 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, |
| 459 | 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, |
| 460 | 73, 79, 83, 89, 97, 101, 103, 107, 109, 113}; |
| 461 | |
| 462 | /* For printing modes in symbolic form */ |
| 463 | |
| 464 | static uschar *mtable_normal[] = |
| 465 | { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" }; |
| 466 | |
| 467 | static uschar *mtable_setid[] = |
| 468 | { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" }; |
| 469 | |
| 470 | static uschar *mtable_sticky[] = |
| 471 | { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" }; |
| 472 | |
| 473 | |
| 474 | |
| 475 | /************************************************* |
| 476 | * Tables for UTF-8 support * |
| 477 | *************************************************/ |
| 478 | |
| 479 | /* Table of the number of extra characters, indexed by the first character |
| 480 | masked with 0x3f. The highest number for a valid UTF-8 character is in fact |
| 481 | 0x3d. */ |
| 482 | |
| 483 | static uschar utf8_table1[] = { |
| 484 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 485 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 486 | 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
| 487 | 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; |
| 488 | |
| 489 | /* These are the masks for the data bits in the first byte of a character, |
| 490 | indexed by the number of additional bytes. */ |
| 491 | |
| 492 | static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01}; |
| 493 | |
| 494 | /* Get the next UTF-8 character, advancing the pointer. */ |
| 495 | |
| 496 | #define GETUTF8INC(c, ptr) \ |
| 497 | c = *ptr++; \ |
| 498 | if ((c & 0xc0) == 0xc0) \ |
| 499 | { \ |
| 500 | int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \ |
| 501 | int s = 6*a; \ |
| 502 | c = (c & utf8_table2[a]) << s; \ |
| 503 | while (a-- > 0) \ |
| 504 | { \ |
| 505 | s -= 6; \ |
| 506 | c |= (*ptr++ & 0x3f) << s; \ |
| 507 | } \ |
| 508 | } |
| 509 | |
| 510 | |
| 511 | /************************************************* |
| 512 | * Binary chop search on a table * |
| 513 | *************************************************/ |
| 514 | |
| 515 | /* This is used for matching expansion items and operators. |
| 516 | |
| 517 | Arguments: |
| 518 | name the name that is being sought |
| 519 | table the table to search |
| 520 | table_size the number of items in the table |
| 521 | |
| 522 | Returns: the offset in the table, or -1 |
| 523 | */ |
| 524 | |
| 525 | static int |
| 526 | chop_match(uschar *name, uschar **table, int table_size) |
| 527 | { |
| 528 | uschar **bot = table; |
| 529 | uschar **top = table + table_size; |
| 530 | |
| 531 | while (top > bot) |
| 532 | { |
| 533 | uschar **mid = bot + (top - bot)/2; |
| 534 | int c = Ustrcmp(name, *mid); |
| 535 | if (c == 0) return mid - table; |
| 536 | if (c > 0) bot = mid + 1; else top = mid; |
| 537 | } |
| 538 | |
| 539 | return -1; |
| 540 | } |
| 541 | |
| 542 | |
| 543 | |
| 544 | /************************************************* |
| 545 | * Check a condition string * |
| 546 | *************************************************/ |
| 547 | |
| 548 | /* This function is called to expand a string, and test the result for a "true" |
| 549 | or "false" value. Failure of the expansion yields FALSE; logged unless it was a |
| 550 | forced fail or lookup defer. All store used by the function can be released on |
| 551 | exit. |
| 552 | |
| 553 | Arguments: |
| 554 | condition the condition string |
| 555 | m1 text to be incorporated in panic error |
| 556 | m2 ditto |
| 557 | |
| 558 | Returns: TRUE if condition is met, FALSE if not |
| 559 | */ |
| 560 | |
| 561 | BOOL |
| 562 | expand_check_condition(uschar *condition, uschar *m1, uschar *m2) |
| 563 | { |
| 564 | int rc; |
| 565 | void *reset_point = store_get(0); |
| 566 | uschar *ss = expand_string(condition); |
| 567 | if (ss == NULL) |
| 568 | { |
| 569 | if (!expand_string_forcedfail && !search_find_defer) |
| 570 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" " |
| 571 | "for %s %s: %s", condition, m1, m2, expand_string_message); |
| 572 | return FALSE; |
| 573 | } |
| 574 | rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 && |
| 575 | strcmpic(ss, US"false") != 0; |
| 576 | store_reset(reset_point); |
| 577 | return rc; |
| 578 | } |
| 579 | |
| 580 | |
| 581 | |
| 582 | /************************************************* |
| 583 | * Pick out a name from a string * |
| 584 | *************************************************/ |
| 585 | |
| 586 | /* If the name is too long, it is silently truncated. |
| 587 | |
| 588 | Arguments: |
| 589 | name points to a buffer into which to put the name |
| 590 | max is the length of the buffer |
| 591 | s points to the first alphabetic character of the name |
| 592 | extras chars other than alphanumerics to permit |
| 593 | |
| 594 | Returns: pointer to the first character after the name |
| 595 | |
| 596 | Note: The test for *s != 0 in the while loop is necessary because |
| 597 | Ustrchr() yields non-NULL if the character is zero (which is not something |
| 598 | I expected). */ |
| 599 | |
| 600 | static uschar * |
| 601 | read_name(uschar *name, int max, uschar *s, uschar *extras) |
| 602 | { |
| 603 | int ptr = 0; |
| 604 | while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL)) |
| 605 | { |
| 606 | if (ptr < max-1) name[ptr++] = *s; |
| 607 | s++; |
| 608 | } |
| 609 | name[ptr] = 0; |
| 610 | return s; |
| 611 | } |
| 612 | |
| 613 | |
| 614 | |
| 615 | /************************************************* |
| 616 | * Pick out the rest of a header name * |
| 617 | *************************************************/ |
| 618 | |
| 619 | /* A variable name starting $header_ (or just $h_ for those who like |
| 620 | abbreviations) might not be the complete header name because headers can |
| 621 | contain any printing characters in their names, except ':'. This function is |
| 622 | called to read the rest of the name, chop h[eader]_ off the front, and put ':' |
| 623 | on the end, if the name was terminated by white space. |
| 624 | |
| 625 | Arguments: |
| 626 | name points to a buffer in which the name read so far exists |
| 627 | max is the length of the buffer |
| 628 | s points to the first character after the name so far, i.e. the |
| 629 | first non-alphameric character after $header_xxxxx |
| 630 | |
| 631 | Returns: a pointer to the first character after the header name |
| 632 | */ |
| 633 | |
| 634 | static uschar * |
| 635 | read_header_name(uschar *name, int max, uschar *s) |
| 636 | { |
| 637 | int prelen = Ustrchr(name, '_') - name + 1; |
| 638 | int ptr = Ustrlen(name) - prelen; |
| 639 | if (ptr > 0) memmove(name, name+prelen, ptr); |
| 640 | while (mac_isgraph(*s) && *s != ':') |
| 641 | { |
| 642 | if (ptr < max-1) name[ptr++] = *s; |
| 643 | s++; |
| 644 | } |
| 645 | if (*s == ':') s++; |
| 646 | name[ptr++] = ':'; |
| 647 | name[ptr] = 0; |
| 648 | return s; |
| 649 | } |
| 650 | |
| 651 | |
| 652 | |
| 653 | /************************************************* |
| 654 | * Pick out a number from a string * |
| 655 | *************************************************/ |
| 656 | |
| 657 | /* Arguments: |
| 658 | n points to an integer into which to put the number |
| 659 | s points to the first digit of the number |
| 660 | |
| 661 | Returns: a pointer to the character after the last digit |
| 662 | */ |
| 663 | |
| 664 | static uschar * |
| 665 | read_number(int *n, uschar *s) |
| 666 | { |
| 667 | *n = 0; |
| 668 | while (isdigit(*s)) *n = *n * 10 + (*s++ - '0'); |
| 669 | return s; |
| 670 | } |
| 671 | |
| 672 | |
| 673 | |
| 674 | /************************************************* |
| 675 | * Extract keyed subfield from a string * |
| 676 | *************************************************/ |
| 677 | |
| 678 | /* The yield is in dynamic store; NULL means that the key was not found. |
| 679 | |
| 680 | Arguments: |
| 681 | key points to the name of the key |
| 682 | s points to the string from which to extract the subfield |
| 683 | |
| 684 | Returns: NULL if the subfield was not found, or |
| 685 | a pointer to the subfield's data |
| 686 | */ |
| 687 | |
| 688 | static uschar * |
| 689 | expand_getkeyed(uschar *key, uschar *s) |
| 690 | { |
| 691 | int length = Ustrlen(key); |
| 692 | while (isspace(*s)) s++; |
| 693 | |
| 694 | /* Loop to search for the key */ |
| 695 | |
| 696 | while (*s != 0) |
| 697 | { |
| 698 | int dkeylength; |
| 699 | uschar *data; |
| 700 | uschar *dkey = s; |
| 701 | |
| 702 | while (*s != 0 && *s != '=' && !isspace(*s)) s++; |
| 703 | dkeylength = s - dkey; |
| 704 | while (isspace(*s)) s++; |
| 705 | if (*s == '=') while (isspace((*(++s)))); |
| 706 | |
| 707 | data = string_dequote(&s); |
| 708 | if (length == dkeylength && strncmpic(key, dkey, length) == 0) |
| 709 | return data; |
| 710 | |
| 711 | while (isspace(*s)) s++; |
| 712 | } |
| 713 | |
| 714 | return NULL; |
| 715 | } |
| 716 | |
| 717 | |
| 718 | |
| 719 | |
| 720 | /************************************************* |
| 721 | * Extract numbered subfield from string * |
| 722 | *************************************************/ |
| 723 | |
| 724 | /* Extracts a numbered field from a string that is divided by tokens - for |
| 725 | example a line from /etc/passwd is divided by colon characters. First field is |
| 726 | numbered one. Negative arguments count from the right. Zero returns the whole |
| 727 | string. Returns NULL if there are insufficient tokens in the string |
| 728 | |
| 729 | ***WARNING*** |
| 730 | Modifies final argument - this is a dynamically generated string, so that's OK. |
| 731 | |
| 732 | Arguments: |
| 733 | field number of field to be extracted, |
| 734 | first field = 1, whole string = 0, last field = -1 |
| 735 | separators characters that are used to break string into tokens |
| 736 | s points to the string from which to extract the subfield |
| 737 | |
| 738 | Returns: NULL if the field was not found, |
| 739 | a pointer to the field's data inside s (modified to add 0) |
| 740 | */ |
| 741 | |
| 742 | static uschar * |
| 743 | expand_gettokened (int field, uschar *separators, uschar *s) |
| 744 | { |
| 745 | int sep = 1; |
| 746 | int count; |
| 747 | uschar *ss = s; |
| 748 | uschar *fieldtext = NULL; |
| 749 | |
| 750 | if (field == 0) return s; |
| 751 | |
| 752 | /* Break the line up into fields in place; for field > 0 we stop when we have |
| 753 | done the number of fields we want. For field < 0 we continue till the end of |
| 754 | the string, counting the number of fields. */ |
| 755 | |
| 756 | count = (field > 0)? field : INT_MAX; |
| 757 | |
| 758 | while (count-- > 0) |
| 759 | { |
| 760 | size_t len; |
| 761 | |
| 762 | /* Previous field was the last one in the string. For a positive field |
| 763 | number, this means there are not enough fields. For a negative field number, |
| 764 | check that there are enough, and scan back to find the one that is wanted. */ |
| 765 | |
| 766 | if (sep == 0) |
| 767 | { |
| 768 | if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL; |
| 769 | if ((-field) == (INT_MAX - count - 1)) return s; |
| 770 | while (field++ < 0) |
| 771 | { |
| 772 | ss--; |
| 773 | while (ss[-1] != 0) ss--; |
| 774 | } |
| 775 | fieldtext = ss; |
| 776 | break; |
| 777 | } |
| 778 | |
| 779 | /* Previous field was not last in the string; save its start and put a |
| 780 | zero at its end. */ |
| 781 | |
| 782 | fieldtext = ss; |
| 783 | len = Ustrcspn(ss, separators); |
| 784 | sep = ss[len]; |
| 785 | ss[len] = 0; |
| 786 | ss += len + 1; |
| 787 | } |
| 788 | |
| 789 | return fieldtext; |
| 790 | } |
| 791 | |
| 792 | |
| 793 | |
| 794 | /************************************************* |
| 795 | * Extract a substring from a string * |
| 796 | *************************************************/ |
| 797 | |
| 798 | /* Perform the ${substr or ${length expansion operations. |
| 799 | |
| 800 | Arguments: |
| 801 | subject the input string |
| 802 | value1 the offset from the start of the input string to the start of |
| 803 | the output string; if negative, count from the right. |
| 804 | value2 the length of the output string, or negative (-1) for unset |
| 805 | if value1 is positive, unset means "all after" |
| 806 | if value1 is negative, unset means "all before" |
| 807 | len set to the length of the returned string |
| 808 | |
| 809 | Returns: pointer to the output string, or NULL if there is an error |
| 810 | */ |
| 811 | |
| 812 | static uschar * |
| 813 | extract_substr(uschar *subject, int value1, int value2, int *len) |
| 814 | { |
| 815 | int sublen = Ustrlen(subject); |
| 816 | |
| 817 | if (value1 < 0) /* count from right */ |
| 818 | { |
| 819 | value1 += sublen; |
| 820 | |
| 821 | /* If the position is before the start, skip to the start, and adjust the |
| 822 | length. If the length ends up negative, the substring is null because nothing |
| 823 | can precede. This falls out naturally when the length is unset, meaning "all |
| 824 | to the left". */ |
| 825 | |
| 826 | if (value1 < 0) |
| 827 | { |
| 828 | value2 += value1; |
| 829 | if (value2 < 0) value2 = 0; |
| 830 | value1 = 0; |
| 831 | } |
| 832 | |
| 833 | /* Otherwise an unset length => characters before value1 */ |
| 834 | |
| 835 | else if (value2 < 0) |
| 836 | { |
| 837 | value2 = value1; |
| 838 | value1 = 0; |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | /* For a non-negative offset, if the starting position is past the end of the |
| 843 | string, the result will be the null string. Otherwise, an unset length means |
| 844 | "rest"; just set it to the maximum - it will be cut down below if necessary. */ |
| 845 | |
| 846 | else |
| 847 | { |
| 848 | if (value1 > sublen) |
| 849 | { |
| 850 | value1 = sublen; |
| 851 | value2 = 0; |
| 852 | } |
| 853 | else if (value2 < 0) value2 = sublen; |
| 854 | } |
| 855 | |
| 856 | /* Cut the length down to the maximum possible for the offset value, and get |
| 857 | the required characters. */ |
| 858 | |
| 859 | if (value1 + value2 > sublen) value2 = sublen - value1; |
| 860 | *len = value2; |
| 861 | return subject + value1; |
| 862 | } |
| 863 | |
| 864 | |
| 865 | |
| 866 | |
| 867 | /************************************************* |
| 868 | * Old-style hash of a string * |
| 869 | *************************************************/ |
| 870 | |
| 871 | /* Perform the ${hash expansion operation. |
| 872 | |
| 873 | Arguments: |
| 874 | subject the input string (an expanded substring) |
| 875 | value1 the length of the output string; if greater or equal to the |
| 876 | length of the input string, the input string is returned |
| 877 | value2 the number of hash characters to use, or 26 if negative |
| 878 | len set to the length of the returned string |
| 879 | |
| 880 | Returns: pointer to the output string, or NULL if there is an error |
| 881 | */ |
| 882 | |
| 883 | static uschar * |
| 884 | compute_hash(uschar *subject, int value1, int value2, int *len) |
| 885 | { |
| 886 | int sublen = Ustrlen(subject); |
| 887 | |
| 888 | if (value2 < 0) value2 = 26; |
| 889 | else if (value2 > Ustrlen(hashcodes)) |
| 890 | { |
| 891 | expand_string_message = |
| 892 | string_sprintf("hash count \"%d\" too big", value2); |
| 893 | return NULL; |
| 894 | } |
| 895 | |
| 896 | /* Calculate the hash text. We know it is shorter than the original string, so |
| 897 | can safely place it in subject[] (we know that subject is always itself an |
| 898 | expanded substring). */ |
| 899 | |
| 900 | if (value1 < sublen) |
| 901 | { |
| 902 | int c; |
| 903 | int i = 0; |
| 904 | int j = value1; |
| 905 | while ((c = (subject[j])) != 0) |
| 906 | { |
| 907 | int shift = (c + j++) & 7; |
| 908 | subject[i] ^= (c << shift) | (c >> (8-shift)); |
| 909 | if (++i >= value1) i = 0; |
| 910 | } |
| 911 | for (i = 0; i < value1; i++) |
| 912 | subject[i] = hashcodes[(subject[i]) % value2]; |
| 913 | } |
| 914 | else value1 = sublen; |
| 915 | |
| 916 | *len = value1; |
| 917 | return subject; |
| 918 | } |
| 919 | |
| 920 | |
| 921 | |
| 922 | |
| 923 | /************************************************* |
| 924 | * Numeric hash of a string * |
| 925 | *************************************************/ |
| 926 | |
| 927 | /* Perform the ${nhash expansion operation. The first characters of the |
| 928 | string are treated as most important, and get the highest prime numbers. |
| 929 | |
| 930 | Arguments: |
| 931 | subject the input string |
| 932 | value1 the maximum value of the first part of the result |
| 933 | value2 the maximum value of the second part of the result, |
| 934 | or negative to produce only a one-part result |
| 935 | len set to the length of the returned string |
| 936 | |
| 937 | Returns: pointer to the output string, or NULL if there is an error. |
| 938 | */ |
| 939 | |
| 940 | static uschar * |
| 941 | compute_nhash (uschar *subject, int value1, int value2, int *len) |
| 942 | { |
| 943 | uschar *s = subject; |
| 944 | int i = 0; |
| 945 | unsigned long int total = 0; /* no overflow */ |
| 946 | |
| 947 | while (*s != 0) |
| 948 | { |
| 949 | if (i == 0) i = sizeof(prime)/sizeof(int) - 1; |
| 950 | total += prime[i--] * (unsigned int)(*s++); |
| 951 | } |
| 952 | |
| 953 | /* If value2 is unset, just compute one number */ |
| 954 | |
| 955 | if (value2 < 0) |
| 956 | { |
| 957 | s = string_sprintf("%d", total % value1); |
| 958 | } |
| 959 | |
| 960 | /* Otherwise do a div/mod hash */ |
| 961 | |
| 962 | else |
| 963 | { |
| 964 | total = total % (value1 * value2); |
| 965 | s = string_sprintf("%d/%d", total/value2, total % value2); |
| 966 | } |
| 967 | |
| 968 | *len = Ustrlen(s); |
| 969 | return s; |
| 970 | } |
| 971 | |
| 972 | |
| 973 | |
| 974 | |
| 975 | |
| 976 | /************************************************* |
| 977 | * Find the value of a header or headers * |
| 978 | *************************************************/ |
| 979 | |
| 980 | /* Multiple instances of the same header get concatenated, and this function |
| 981 | can also return a concatenation of all the header lines. When concatenating |
| 982 | specific headers that contain lists of addresses, a comma is inserted between |
| 983 | them. Otherwise we use a straight concatenation. Because some messages can have |
| 984 | pathologically large number of lines, there is a limit on the length that is |
| 985 | returned. Also, to avoid massive store use which would result from using |
| 986 | string_cat() as it copies and extends strings, we do a preliminary pass to find |
| 987 | out exactly how much store will be needed. On "normal" messages this will be |
| 988 | pretty trivial. |
| 989 | |
| 990 | Arguments: |
| 991 | name the name of the header, without the leading $header_ or $h_, |
| 992 | or NULL if a concatenation of all headers is required |
| 993 | exists_only TRUE if called from a def: test; don't need to build a string; |
| 994 | just return a string that is not "" and not "0" if the header |
| 995 | exists |
| 996 | newsize return the size of memory block that was obtained; may be NULL |
| 997 | if exists_only is TRUE |
| 998 | want_raw TRUE if called for $rh_ or $rheader_ variables; no processing, |
| 999 | other than concatenating, will be done on the header |
| 1000 | charset name of charset to translate MIME words to; used only if |
| 1001 | want_raw is false; if NULL, no translation is done (this is |
| 1002 | used for $bh_ and $bheader_) |
| 1003 | |
| 1004 | Returns: NULL if the header does not exist, else a pointer to a new |
| 1005 | store block |
| 1006 | */ |
| 1007 | |
| 1008 | static uschar * |
| 1009 | find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw, |
| 1010 | uschar *charset) |
| 1011 | { |
| 1012 | BOOL found = name == NULL; |
| 1013 | int comma = 0; |
| 1014 | int len = found? 0 : Ustrlen(name); |
| 1015 | int i; |
| 1016 | uschar *yield = NULL; |
| 1017 | uschar *ptr = NULL; |
| 1018 | |
| 1019 | /* Loop for two passes - saves code repetition */ |
| 1020 | |
| 1021 | for (i = 0; i < 2; i++) |
| 1022 | { |
| 1023 | int size = 0; |
| 1024 | header_line *h; |
| 1025 | |
| 1026 | for (h = header_list; size < header_insert_maxlen && h != NULL; h = h->next) |
| 1027 | { |
| 1028 | if (h->type != htype_old && h->text != NULL) /* NULL => Received: placeholder */ |
| 1029 | { |
| 1030 | if (name == NULL || (len <= h->slen && strncmpic(name, h->text, len) == 0)) |
| 1031 | { |
| 1032 | int ilen; |
| 1033 | uschar *t; |
| 1034 | |
| 1035 | if (exists_only) return US"1"; /* don't need actual string */ |
| 1036 | found = TRUE; |
| 1037 | t = h->text + len; /* text to insert */ |
| 1038 | if (!want_raw) /* unless wanted raw, */ |
| 1039 | while (isspace(*t)) t++; /* remove leading white space */ |
| 1040 | ilen = h->slen - (t - h->text); /* length to insert */ |
| 1041 | |
| 1042 | /* Set comma = 1 if handling a single header and it's one of those |
| 1043 | that contains an address list, except when asked for raw headers. Only |
| 1044 | need to do this once. */ |
| 1045 | |
| 1046 | if (!want_raw && name != NULL && comma == 0 && |
| 1047 | Ustrchr("BCFRST", h->type) != NULL) |
| 1048 | comma = 1; |
| 1049 | |
| 1050 | /* First pass - compute total store needed; second pass - compute |
| 1051 | total store used, including this header. */ |
| 1052 | |
| 1053 | size += ilen + comma; |
| 1054 | |
| 1055 | /* Second pass - concatentate the data, up to a maximum. Note that |
| 1056 | the loop stops when size hits the limit. */ |
| 1057 | |
| 1058 | if (i != 0) |
| 1059 | { |
| 1060 | if (size > header_insert_maxlen) |
| 1061 | { |
| 1062 | ilen -= size - header_insert_maxlen; |
| 1063 | comma = 0; |
| 1064 | } |
| 1065 | Ustrncpy(ptr, t, ilen); |
| 1066 | ptr += ilen; |
| 1067 | if (comma != 0 && ilen > 0) |
| 1068 | { |
| 1069 | ptr[-1] = ','; |
| 1070 | *ptr++ = '\n'; |
| 1071 | } |
| 1072 | } |
| 1073 | } |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | /* At end of first pass, truncate size if necessary, and get the buffer |
| 1078 | to hold the data, returning the buffer size. */ |
| 1079 | |
| 1080 | if (i == 0) |
| 1081 | { |
| 1082 | if (!found) return NULL; |
| 1083 | if (size > header_insert_maxlen) size = header_insert_maxlen; |
| 1084 | *newsize = size + 1; |
| 1085 | ptr = yield = store_get(*newsize); |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | /* Remove a redundant added comma if present */ |
| 1090 | |
| 1091 | if (comma != 0 && ptr > yield) ptr -= 2; |
| 1092 | |
| 1093 | /* That's all we do for raw header expansion. */ |
| 1094 | |
| 1095 | if (want_raw) |
| 1096 | { |
| 1097 | *ptr = 0; |
| 1098 | } |
| 1099 | |
| 1100 | /* Otherwise, we remove trailing whitespace, including newlines. Then we do RFC |
| 1101 | 2047 decoding, translating the charset if requested. The rfc2047_decode2() |
| 1102 | function can return an error with decoded data if the charset translation |
| 1103 | fails. If decoding fails, it returns NULL. */ |
| 1104 | |
| 1105 | else |
| 1106 | { |
| 1107 | uschar *decoded, *error; |
| 1108 | while (ptr > yield && isspace(ptr[-1])) ptr--; |
| 1109 | *ptr = 0; |
| 1110 | decoded = rfc2047_decode2(yield, TRUE, charset, '?', NULL, newsize, &error); |
| 1111 | if (error != NULL) |
| 1112 | { |
| 1113 | DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n" |
| 1114 | " input was: %s\n", error, yield); |
| 1115 | } |
| 1116 | if (decoded != NULL) yield = decoded; |
| 1117 | } |
| 1118 | |
| 1119 | return yield; |
| 1120 | } |
| 1121 | |
| 1122 | |
| 1123 | |
| 1124 | |
| 1125 | /************************************************* |
| 1126 | * Find value of a variable * |
| 1127 | *************************************************/ |
| 1128 | |
| 1129 | /* The table of variables is kept in alphabetic order, so we can search it |
| 1130 | using a binary chop. The "choplen" variable is nothing to do with the binary |
| 1131 | chop. |
| 1132 | |
| 1133 | Arguments: |
| 1134 | name the name of the variable being sought |
| 1135 | exists_only TRUE if this is a def: test; passed on to find_header() |
| 1136 | skipping TRUE => skip any processing evaluation; this is not the same as |
| 1137 | exists_only because def: may test for values that are first |
| 1138 | evaluated here |
| 1139 | newsize pointer to an int which is initially zero; if the answer is in |
| 1140 | a new memory buffer, *newsize is set to its size |
| 1141 | |
| 1142 | Returns: NULL if the variable does not exist, or |
| 1143 | a pointer to the variable's contents, or |
| 1144 | something non-NULL if exists_only is TRUE |
| 1145 | */ |
| 1146 | |
| 1147 | static uschar * |
| 1148 | find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize) |
| 1149 | { |
| 1150 | int first = 0; |
| 1151 | int last = var_table_size; |
| 1152 | |
| 1153 | while (last > first) |
| 1154 | { |
| 1155 | uschar *s, *domain; |
| 1156 | uschar **ss; |
| 1157 | int middle = (first + last)/2; |
| 1158 | int c = Ustrcmp(name, var_table[middle].name); |
| 1159 | |
| 1160 | if (c > 0) { first = middle + 1; continue; } |
| 1161 | if (c < 0) { last = middle; continue; } |
| 1162 | |
| 1163 | /* Found an existing variable. If in skipping state, the value isn't needed, |
| 1164 | and we want to avoid processing (such as looking up up the host name). */ |
| 1165 | |
| 1166 | if (skipping) return US""; |
| 1167 | |
| 1168 | switch (var_table[middle].type) |
| 1169 | { |
| 1170 | case vtype_filter_int: |
| 1171 | if (!filter_running) return NULL; |
| 1172 | /* Fall through */ |
| 1173 | |
| 1174 | case vtype_int: |
| 1175 | sprintf(CS var_buffer, "%d", *(int *)(var_table[middle].value)); /* Integer */ |
| 1176 | return var_buffer; |
| 1177 | |
| 1178 | case vtype_ino: |
| 1179 | sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(var_table[middle].value))); /* Inode */ |
| 1180 | return var_buffer; |
| 1181 | |
| 1182 | case vtype_gid: |
| 1183 | sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(var_table[middle].value))); /* gid */ |
| 1184 | return var_buffer; |
| 1185 | |
| 1186 | case vtype_uid: |
| 1187 | sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(var_table[middle].value))); /* uid */ |
| 1188 | return var_buffer; |
| 1189 | |
| 1190 | case vtype_stringptr: /* Pointer to string */ |
| 1191 | s = *((uschar **)(var_table[middle].value)); |
| 1192 | return (s == NULL)? US"" : s; |
| 1193 | |
| 1194 | case vtype_pid: |
| 1195 | sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */ |
| 1196 | return var_buffer; |
| 1197 | |
| 1198 | case vtype_load_avg: |
| 1199 | sprintf(CS var_buffer, "%d", os_getloadavg()); /* load_average */ |
| 1200 | return var_buffer; |
| 1201 | |
| 1202 | case vtype_host_lookup: /* Lookup if not done so */ |
| 1203 | if (sender_host_name == NULL && sender_host_address != NULL && |
| 1204 | !host_lookup_failed && host_name_lookup() == OK) |
| 1205 | host_build_sender_fullhost(); |
| 1206 | return (sender_host_name == NULL)? US"" : sender_host_name; |
| 1207 | |
| 1208 | case vtype_localpart: /* Get local part from address */ |
| 1209 | s = *((uschar **)(var_table[middle].value)); |
| 1210 | if (s == NULL) return US""; |
| 1211 | domain = Ustrrchr(s, '@'); |
| 1212 | if (domain == NULL) return s; |
| 1213 | if (domain - s > sizeof(var_buffer) - 1) |
| 1214 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than %d in " |
| 1215 | "string expansion", sizeof(var_buffer)); |
| 1216 | Ustrncpy(var_buffer, s, domain - s); |
| 1217 | var_buffer[domain - s] = 0; |
| 1218 | return var_buffer; |
| 1219 | |
| 1220 | case vtype_domain: /* Get domain from address */ |
| 1221 | s = *((uschar **)(var_table[middle].value)); |
| 1222 | if (s == NULL) return US""; |
| 1223 | domain = Ustrrchr(s, '@'); |
| 1224 | return (domain == NULL)? US"" : domain + 1; |
| 1225 | |
| 1226 | case vtype_msgheaders: |
| 1227 | return find_header(NULL, exists_only, newsize, FALSE, NULL); |
| 1228 | |
| 1229 | case vtype_msgbody: /* Pointer to msgbody string */ |
| 1230 | case vtype_msgbody_end: /* Ditto, the end of the msg */ |
| 1231 | ss = (uschar **)(var_table[middle].value); |
| 1232 | if (*ss == NULL && deliver_datafile >= 0) /* Read body when needed */ |
| 1233 | { |
| 1234 | uschar *body; |
| 1235 | int start_offset = SPOOL_DATA_START_OFFSET; |
| 1236 | int len = message_body_visible; |
| 1237 | if (len > message_size) len = message_size; |
| 1238 | *ss = body = store_malloc(len+1); |
| 1239 | body[0] = 0; |
| 1240 | if (var_table[middle].type == vtype_msgbody_end) |
| 1241 | { |
| 1242 | struct stat statbuf; |
| 1243 | if (fstat(deliver_datafile, &statbuf) == 0) |
| 1244 | { |
| 1245 | start_offset = statbuf.st_size - len; |
| 1246 | if (start_offset < SPOOL_DATA_START_OFFSET) |
| 1247 | start_offset = SPOOL_DATA_START_OFFSET; |
| 1248 | } |
| 1249 | } |
| 1250 | lseek(deliver_datafile, start_offset, SEEK_SET); |
| 1251 | len = read(deliver_datafile, body, len); |
| 1252 | if (len > 0) |
| 1253 | { |
| 1254 | body[len] = 0; |
| 1255 | while (len > 0) |
| 1256 | { |
| 1257 | if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; |
| 1258 | } |
| 1259 | } |
| 1260 | } |
| 1261 | return (*ss == NULL)? US"" : *ss; |
| 1262 | |
| 1263 | case vtype_todbsdin: /* BSD inbox time of day */ |
| 1264 | return tod_stamp(tod_bsdin); |
| 1265 | |
| 1266 | case vtype_tode: /* Unix epoch time of day */ |
| 1267 | return tod_stamp(tod_epoch); |
| 1268 | |
| 1269 | case vtype_todf: /* Full time of day */ |
| 1270 | return tod_stamp(tod_full); |
| 1271 | |
| 1272 | case vtype_todl: /* Log format time of day */ |
| 1273 | return tod_stamp(tod_log_bare); /* (without timezone) */ |
| 1274 | |
| 1275 | case vtype_todzone: /* Time zone offset only */ |
| 1276 | return tod_stamp(tod_zone); |
| 1277 | |
| 1278 | case vtype_todzulu: /* Zulu time */ |
| 1279 | return tod_stamp(tod_zulu); |
| 1280 | |
| 1281 | case vtype_todlf: /* Log file datestamp tod */ |
| 1282 | return tod_stamp(tod_log_datestamp); |
| 1283 | |
| 1284 | case vtype_reply: /* Get reply address */ |
| 1285 | s = find_header(US"reply-to:", exists_only, newsize, FALSE, |
| 1286 | headers_charset); |
| 1287 | if (s == NULL || *s == 0) |
| 1288 | s = find_header(US"from:", exists_only, newsize, FALSE, headers_charset); |
| 1289 | return (s == NULL)? US"" : s; |
| 1290 | |
| 1291 | /* A recipients list is available only during system message filtering, |
| 1292 | during ACL processing after DATA, and while expanding pipe commands |
| 1293 | generated from a system filter, but not elsewhere. */ |
| 1294 | |
| 1295 | case vtype_recipients: |
| 1296 | if (!enable_dollar_recipients) return NULL; else |
| 1297 | { |
| 1298 | int size = 128; |
| 1299 | int ptr = 0; |
| 1300 | int i; |
| 1301 | s = store_get(size); |
| 1302 | for (i = 0; i < recipients_count; i++) |
| 1303 | { |
| 1304 | if (i != 0) s = string_cat(s, &size, &ptr, US", ", 2); |
| 1305 | s = string_cat(s, &size, &ptr, recipients_list[i].address, |
| 1306 | Ustrlen(recipients_list[i].address)); |
| 1307 | } |
| 1308 | s[ptr] = 0; /* string_cat() leaves room */ |
| 1309 | } |
| 1310 | return s; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | return NULL; /* Unknown variable name */ |
| 1315 | } |
| 1316 | |
| 1317 | |
| 1318 | |
| 1319 | |
| 1320 | /************************************************* |
| 1321 | * Read and expand substrings * |
| 1322 | *************************************************/ |
| 1323 | |
| 1324 | /* This function is called to read and expand argument substrings for various |
| 1325 | expansion items. Some have a minimum requirement that is less than the maximum; |
| 1326 | in these cases, the first non-present one is set to NULL. |
| 1327 | |
| 1328 | Arguments: |
| 1329 | sub points to vector of pointers to set |
| 1330 | n maximum number of substrings |
| 1331 | m minimum required |
| 1332 | sptr points to current string pointer |
| 1333 | skipping the skipping flag |
| 1334 | check_end if TRUE, check for final '}' |
| 1335 | name name of item, for error message |
| 1336 | |
| 1337 | Returns: 0 OK; string pointer updated |
| 1338 | 1 curly bracketing error (too few arguments) |
| 1339 | 2 too many arguments (only if check_end is set); message set |
| 1340 | 3 other error (expansion failure) |
| 1341 | */ |
| 1342 | |
| 1343 | static int |
| 1344 | read_subs(uschar **sub, int n, int m, uschar **sptr, BOOL skipping, |
| 1345 | BOOL check_end, uschar *name) |
| 1346 | { |
| 1347 | int i; |
| 1348 | uschar *s = *sptr; |
| 1349 | |
| 1350 | while (isspace(*s)) s++; |
| 1351 | for (i = 0; i < n; i++) |
| 1352 | { |
| 1353 | if (*s != '{') |
| 1354 | { |
| 1355 | if (i < m) return 1; |
| 1356 | sub[i] = NULL; |
| 1357 | break; |
| 1358 | } |
| 1359 | sub[i] = expand_string_internal(s+1, TRUE, &s, skipping); |
| 1360 | if (sub[i] == NULL) return 3; |
| 1361 | if (*s++ != '}') return 1; |
| 1362 | while (isspace(*s)) s++; |
| 1363 | } |
| 1364 | if (check_end && *s++ != '}') |
| 1365 | { |
| 1366 | if (s[-1] == '{') |
| 1367 | { |
| 1368 | expand_string_message = string_sprintf("Too many arguments for \"%s\" " |
| 1369 | "(max is %d)", name, n); |
| 1370 | return 2; |
| 1371 | } |
| 1372 | return 1; |
| 1373 | } |
| 1374 | |
| 1375 | *sptr = s; |
| 1376 | return 0; |
| 1377 | } |
| 1378 | |
| 1379 | |
| 1380 | |
| 1381 | |
| 1382 | /************************************************* |
| 1383 | * Read and evaluate a condition * |
| 1384 | *************************************************/ |
| 1385 | |
| 1386 | /* |
| 1387 | Arguments: |
| 1388 | s points to the start of the condition text |
| 1389 | yield points to a BOOL to hold the result of the condition test; |
| 1390 | if NULL, we are just reading through a condition that is |
| 1391 | part of an "or" combination to check syntax, or in a state |
| 1392 | where the answer isn't required |
| 1393 | |
| 1394 | Returns: a pointer to the first character after the condition, or |
| 1395 | NULL after an error |
| 1396 | */ |
| 1397 | |
| 1398 | static uschar * |
| 1399 | eval_condition(uschar *s, BOOL *yield) |
| 1400 | { |
| 1401 | BOOL testfor = TRUE; |
| 1402 | BOOL tempcond, combined_cond; |
| 1403 | BOOL *subcondptr; |
| 1404 | int i, rc, cond_type, roffset; |
| 1405 | int num[2]; |
| 1406 | struct stat statbuf; |
| 1407 | uschar name[256]; |
| 1408 | uschar *sub[4]; |
| 1409 | |
| 1410 | const pcre *re; |
| 1411 | const uschar *rerror; |
| 1412 | |
| 1413 | for (;;) |
| 1414 | { |
| 1415 | while (isspace(*s)) s++; |
| 1416 | if (*s == '!') { testfor = !testfor; s++; } else break; |
| 1417 | } |
| 1418 | |
| 1419 | /* Numeric comparisons are symbolic */ |
| 1420 | |
| 1421 | if (*s == '=' || *s == '>' || *s == '<') |
| 1422 | { |
| 1423 | int p = 0; |
| 1424 | name[p++] = *s++; |
| 1425 | if (*s == '=') |
| 1426 | { |
| 1427 | name[p++] = '='; |
| 1428 | s++; |
| 1429 | } |
| 1430 | name[p] = 0; |
| 1431 | } |
| 1432 | |
| 1433 | /* All other conditions are named */ |
| 1434 | |
| 1435 | else s = read_name(name, 256, s, US"_"); |
| 1436 | |
| 1437 | /* If we haven't read a name, it means some non-alpha character is first. */ |
| 1438 | |
| 1439 | if (name[0] == 0) |
| 1440 | { |
| 1441 | expand_string_message = string_sprintf("condition name expected, " |
| 1442 | "but found \"%.16s\"", s); |
| 1443 | return NULL; |
| 1444 | } |
| 1445 | |
| 1446 | /* Find which condition we are dealing with, and switch on it */ |
| 1447 | |
| 1448 | cond_type = chop_match(name, cond_table, sizeof(cond_table)/sizeof(uschar *)); |
| 1449 | switch(cond_type) |
| 1450 | { |
| 1451 | /* def: tests for a non-zero or non-NULL variable, or for an existing |
| 1452 | header */ |
| 1453 | |
| 1454 | case ECOND_DEF: |
| 1455 | if (*s != ':') |
| 1456 | { |
| 1457 | expand_string_message = US"\":\" expected after \"def\""; |
| 1458 | return NULL; |
| 1459 | } |
| 1460 | |
| 1461 | s = read_name(name, 256, s+1, US"_"); |
| 1462 | |
| 1463 | /* Test for a header's existence */ |
| 1464 | |
| 1465 | if (Ustrncmp(name, "h_", 2) == 0 || |
| 1466 | Ustrncmp(name, "rh_", 3) == 0 || |
| 1467 | Ustrncmp(name, "bh_", 3) == 0 || |
| 1468 | Ustrncmp(name, "header_", 7) == 0 || |
| 1469 | Ustrncmp(name, "rheader_", 8) == 0 || |
| 1470 | Ustrncmp(name, "bheader_", 8) == 0) |
| 1471 | { |
| 1472 | s = read_header_name(name, 256, s); |
| 1473 | if (yield != NULL) *yield = |
| 1474 | (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor; |
| 1475 | } |
| 1476 | |
| 1477 | /* Test for a variable's having a non-empty value. If yield == NULL we |
| 1478 | are in a skipping state, and don't care about the answer. */ |
| 1479 | |
| 1480 | else |
| 1481 | { |
| 1482 | uschar *value = find_variable(name, TRUE, yield == NULL, NULL); |
| 1483 | if (value == NULL) |
| 1484 | { |
| 1485 | expand_string_message = (name[0] == 0)? |
| 1486 | string_sprintf("variable name omitted after \"def:\"") : |
| 1487 | string_sprintf("unknown variable \"%s\" after \"def:\"", name); |
| 1488 | return NULL; |
| 1489 | } |
| 1490 | if (yield != NULL) |
| 1491 | *yield = (value[0] != 0 && Ustrcmp(value, "0") != 0) == testfor; |
| 1492 | } |
| 1493 | |
| 1494 | return s; |
| 1495 | |
| 1496 | |
| 1497 | /* first_delivery tests for first delivery attempt */ |
| 1498 | |
| 1499 | case ECOND_FIRST_DELIVERY: |
| 1500 | if (yield != NULL) *yield = deliver_firsttime == testfor; |
| 1501 | return s; |
| 1502 | |
| 1503 | |
| 1504 | /* queue_running tests for any process started by a queue runner */ |
| 1505 | |
| 1506 | case ECOND_QUEUE_RUNNING: |
| 1507 | if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor; |
| 1508 | return s; |
| 1509 | |
| 1510 | |
| 1511 | /* exists: tests for file existence |
| 1512 | isip: tests for any IP address |
| 1513 | isip4: tests for an IPv4 address |
| 1514 | isip6: tests for an IPv6 address |
| 1515 | pam: does PAM authentication |
| 1516 | radius: does RADIUS authentication |
| 1517 | ldapauth: does LDAP authentication |
| 1518 | pwcheck: does Cyrus SASL pwcheck authentication |
| 1519 | */ |
| 1520 | |
| 1521 | case ECOND_EXISTS: |
| 1522 | case ECOND_ISIP: |
| 1523 | case ECOND_ISIP4: |
| 1524 | case ECOND_ISIP6: |
| 1525 | case ECOND_PAM: |
| 1526 | case ECOND_RADIUS: |
| 1527 | case ECOND_LDAPAUTH: |
| 1528 | case ECOND_PWCHECK: |
| 1529 | |
| 1530 | while (isspace(*s)) s++; |
| 1531 | if (*s != '{') goto COND_FAILED_CURLY_START; |
| 1532 | |
| 1533 | sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL); |
| 1534 | if (sub[0] == NULL) return NULL; |
| 1535 | if (*s++ != '}') goto COND_FAILED_CURLY_END; |
| 1536 | |
| 1537 | if (yield == NULL) return s; /* No need to run the test if skipping */ |
| 1538 | |
| 1539 | switch(cond_type) |
| 1540 | { |
| 1541 | case ECOND_EXISTS: |
| 1542 | if ((expand_forbid & RDO_EXISTS) != 0) |
| 1543 | { |
| 1544 | expand_string_message = US"File existence tests are not permitted"; |
| 1545 | return NULL; |
| 1546 | } |
| 1547 | *yield = (Ustat(sub[0], &statbuf) == 0) == testfor; |
| 1548 | break; |
| 1549 | |
| 1550 | case ECOND_ISIP: |
| 1551 | case ECOND_ISIP4: |
| 1552 | case ECOND_ISIP6: |
| 1553 | rc = string_is_ip_address(sub[0], NULL); |
| 1554 | *yield = ((cond_type == ECOND_ISIP)? (rc > 0) : |
| 1555 | (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor; |
| 1556 | break; |
| 1557 | |
| 1558 | /* Various authentication tests - all optionally compiled */ |
| 1559 | |
| 1560 | case ECOND_PAM: |
| 1561 | #ifdef SUPPORT_PAM |
| 1562 | rc = auth_call_pam(sub[0], &expand_string_message); |
| 1563 | goto END_AUTH; |
| 1564 | #else |
| 1565 | goto COND_FAILED_NOT_COMPILED; |
| 1566 | #endif /* SUPPORT_PAM */ |
| 1567 | |
| 1568 | case ECOND_RADIUS: |
| 1569 | #ifdef RADIUS_CONFIG_FILE |
| 1570 | rc = auth_call_radius(sub[0], &expand_string_message); |
| 1571 | goto END_AUTH; |
| 1572 | #else |
| 1573 | goto COND_FAILED_NOT_COMPILED; |
| 1574 | #endif /* RADIUS_CONFIG_FILE */ |
| 1575 | |
| 1576 | case ECOND_LDAPAUTH: |
| 1577 | #ifdef LOOKUP_LDAP |
| 1578 | { |
| 1579 | /* Just to keep the interface the same */ |
| 1580 | BOOL do_cache; |
| 1581 | int old_pool = store_pool; |
| 1582 | store_pool = POOL_SEARCH; |
| 1583 | rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL, |
| 1584 | &expand_string_message, &do_cache); |
| 1585 | store_pool = old_pool; |
| 1586 | } |
| 1587 | goto END_AUTH; |
| 1588 | #else |
| 1589 | goto COND_FAILED_NOT_COMPILED; |
| 1590 | #endif /* LOOKUP_LDAP */ |
| 1591 | |
| 1592 | case ECOND_PWCHECK: |
| 1593 | #ifdef CYRUS_PWCHECK_SOCKET |
| 1594 | rc = auth_call_pwcheck(sub[0], &expand_string_message); |
| 1595 | goto END_AUTH; |
| 1596 | #else |
| 1597 | goto COND_FAILED_NOT_COMPILED; |
| 1598 | #endif /* CYRUS_PWCHECK_SOCKET */ |
| 1599 | |
| 1600 | #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \ |
| 1601 | defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET) |
| 1602 | END_AUTH: |
| 1603 | if (rc == ERROR || rc == DEFER) return NULL; |
| 1604 | *yield = (rc == OK) == testfor; |
| 1605 | #endif |
| 1606 | } |
| 1607 | return s; |
| 1608 | |
| 1609 | |
| 1610 | /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used: |
| 1611 | |
| 1612 | ${if saslauthd {{username}{password}{service}{realm}} {yes}[no}} |
| 1613 | |
| 1614 | However, the last two are optional. That is why the whole set is enclosed |
| 1615 | in their own set or braces. */ |
| 1616 | |
| 1617 | case ECOND_SASLAUTHD: |
| 1618 | #ifndef CYRUS_SASLAUTHD_SOCKET |
| 1619 | goto COND_FAILED_NOT_COMPILED; |
| 1620 | #else |
| 1621 | while (isspace(*s)) s++; |
| 1622 | if (*s++ != '{') goto COND_FAILED_CURLY_START; |
| 1623 | switch(read_subs(sub, 4, 2, &s, yield == NULL, TRUE, US"saslauthd")) |
| 1624 | { |
| 1625 | case 1: expand_string_message = US"too few arguments or bracketing " |
| 1626 | "error for saslauthd"; |
| 1627 | case 2: |
| 1628 | case 3: return NULL; |
| 1629 | } |
| 1630 | if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */ |
| 1631 | if (yield != NULL) |
| 1632 | { |
| 1633 | int rc; |
| 1634 | rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3], |
| 1635 | &expand_string_message); |
| 1636 | if (rc == ERROR || rc == DEFER) return NULL; |
| 1637 | *yield = (rc == OK) == testfor; |
| 1638 | } |
| 1639 | return s; |
| 1640 | #endif /* CYRUS_SASLAUTHD_SOCKET */ |
| 1641 | |
| 1642 | |
| 1643 | /* symbolic operators for numeric and string comparison, and a number of |
| 1644 | other operators, all requiring two arguments. |
| 1645 | |
| 1646 | match: does a regular expression match and sets up the numerical |
| 1647 | variables if it succeeds |
| 1648 | match_address: matches in an address list |
| 1649 | match_domain: matches in a domain list |
| 1650 | match_local_part: matches in a local part list |
| 1651 | crypteq: encrypts plaintext and compares against an encrypted text, |
| 1652 | using crypt(), crypt16(), MD5 or SHA-1 |
| 1653 | */ |
| 1654 | |
| 1655 | case ECOND_MATCH: |
| 1656 | case ECOND_MATCH_ADDRESS: |
| 1657 | case ECOND_MATCH_DOMAIN: |
| 1658 | case ECOND_MATCH_LOCAL_PART: |
| 1659 | case ECOND_CRYPTEQ: |
| 1660 | |
| 1661 | case ECOND_NUM_L: /* Numerical comparisons */ |
| 1662 | case ECOND_NUM_LE: |
| 1663 | case ECOND_NUM_E: |
| 1664 | case ECOND_NUM_EE: |
| 1665 | case ECOND_NUM_G: |
| 1666 | case ECOND_NUM_GE: |
| 1667 | |
| 1668 | case ECOND_STR_LT: /* String comparisons */ |
| 1669 | case ECOND_STR_LTI: |
| 1670 | case ECOND_STR_LE: |
| 1671 | case ECOND_STR_LEI: |
| 1672 | case ECOND_STR_EQ: |
| 1673 | case ECOND_STR_EQI: |
| 1674 | case ECOND_STR_GT: |
| 1675 | case ECOND_STR_GTI: |
| 1676 | case ECOND_STR_GE: |
| 1677 | case ECOND_STR_GEI: |
| 1678 | |
| 1679 | for (i = 0; i < 2; i++) |
| 1680 | { |
| 1681 | while (isspace(*s)) s++; |
| 1682 | if (*s != '{') |
| 1683 | { |
| 1684 | if (i == 0) goto COND_FAILED_CURLY_START; |
| 1685 | expand_string_message = string_sprintf("missing 2nd string in {} " |
| 1686 | "after \"%s\"", name); |
| 1687 | return NULL; |
| 1688 | } |
| 1689 | sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL); |
| 1690 | if (sub[i] == NULL) return NULL; |
| 1691 | if (*s++ != '}') goto COND_FAILED_CURLY_END; |
| 1692 | |
| 1693 | /* Convert to numerical if required; we know that the names of all the |
| 1694 | conditions that compare numbers do not start with a letter. This just saves |
| 1695 | checking for them individually. */ |
| 1696 | |
| 1697 | if (!isalpha(name[0])) |
| 1698 | { |
| 1699 | uschar *endptr; |
| 1700 | num[i] = (int)Ustrtol((const uschar *)sub[i], &endptr, 10); |
| 1701 | if (tolower(*endptr) == 'k') |
| 1702 | { |
| 1703 | num[i] *= 1024; |
| 1704 | endptr++; |
| 1705 | } |
| 1706 | else if (tolower(*endptr) == 'm') |
| 1707 | { |
| 1708 | num[i] *= 1024*1024; |
| 1709 | endptr++; |
| 1710 | } |
| 1711 | while (isspace(*endptr)) endptr++; |
| 1712 | if (*endptr != 0) |
| 1713 | { |
| 1714 | expand_string_message = string_sprintf("\"%s\" is not a number", |
| 1715 | sub[i]); |
| 1716 | return NULL; |
| 1717 | } |
| 1718 | } |
| 1719 | } |
| 1720 | |
| 1721 | /* Result not required */ |
| 1722 | |
| 1723 | if (yield == NULL) return s; |
| 1724 | |
| 1725 | /* Do an appropriate comparison */ |
| 1726 | |
| 1727 | switch(cond_type) |
| 1728 | { |
| 1729 | case ECOND_NUM_E: |
| 1730 | case ECOND_NUM_EE: |
| 1731 | *yield = (num[0] == num[1]) == testfor; |
| 1732 | break; |
| 1733 | |
| 1734 | case ECOND_NUM_G: |
| 1735 | *yield = (num[0] > num[1]) == testfor; |
| 1736 | break; |
| 1737 | |
| 1738 | case ECOND_NUM_GE: |
| 1739 | *yield = (num[0] >= num[1]) == testfor; |
| 1740 | break; |
| 1741 | |
| 1742 | case ECOND_NUM_L: |
| 1743 | *yield = (num[0] < num[1]) == testfor; |
| 1744 | break; |
| 1745 | |
| 1746 | case ECOND_NUM_LE: |
| 1747 | *yield = (num[0] <= num[1]) == testfor; |
| 1748 | break; |
| 1749 | |
| 1750 | case ECOND_STR_LT: |
| 1751 | *yield = (Ustrcmp(sub[0], sub[1]) < 0) == testfor; |
| 1752 | break; |
| 1753 | |
| 1754 | case ECOND_STR_LTI: |
| 1755 | *yield = (strcmpic(sub[0], sub[1]) < 0) == testfor; |
| 1756 | break; |
| 1757 | |
| 1758 | case ECOND_STR_LE: |
| 1759 | *yield = (Ustrcmp(sub[0], sub[1]) <= 0) == testfor; |
| 1760 | break; |
| 1761 | |
| 1762 | case ECOND_STR_LEI: |
| 1763 | *yield = (strcmpic(sub[0], sub[1]) <= 0) == testfor; |
| 1764 | break; |
| 1765 | |
| 1766 | case ECOND_STR_EQ: |
| 1767 | *yield = (Ustrcmp(sub[0], sub[1]) == 0) == testfor; |
| 1768 | break; |
| 1769 | |
| 1770 | case ECOND_STR_EQI: |
| 1771 | *yield = (strcmpic(sub[0], sub[1]) == 0) == testfor; |
| 1772 | break; |
| 1773 | |
| 1774 | case ECOND_STR_GT: |
| 1775 | *yield = (Ustrcmp(sub[0], sub[1]) > 0) == testfor; |
| 1776 | break; |
| 1777 | |
| 1778 | case ECOND_STR_GTI: |
| 1779 | *yield = (strcmpic(sub[0], sub[1]) > 0) == testfor; |
| 1780 | break; |
| 1781 | |
| 1782 | case ECOND_STR_GE: |
| 1783 | *yield = (Ustrcmp(sub[0], sub[1]) >= 0) == testfor; |
| 1784 | break; |
| 1785 | |
| 1786 | case ECOND_STR_GEI: |
| 1787 | *yield = (strcmpic(sub[0], sub[1]) >= 0) == testfor; |
| 1788 | break; |
| 1789 | |
| 1790 | case ECOND_MATCH: /* Regular expression match */ |
| 1791 | re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset, |
| 1792 | NULL); |
| 1793 | if (re == NULL) |
| 1794 | { |
| 1795 | expand_string_message = string_sprintf("regular expression error in " |
| 1796 | "\"%s\": %s at offset %d", sub[1], rerror, roffset); |
| 1797 | return NULL; |
| 1798 | } |
| 1799 | *yield = regex_match_and_setup(re, sub[0], 0, -1) == testfor; |
| 1800 | break; |
| 1801 | |
| 1802 | case ECOND_MATCH_ADDRESS: /* Match in an address list */ |
| 1803 | rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL); |
| 1804 | goto MATCHED_SOMETHING; |
| 1805 | |
| 1806 | case ECOND_MATCH_DOMAIN: /* Match in a domain list */ |
| 1807 | rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL, |
| 1808 | MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL); |
| 1809 | goto MATCHED_SOMETHING; |
| 1810 | |
| 1811 | case ECOND_MATCH_LOCAL_PART: |
| 1812 | rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL, |
| 1813 | MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL); |
| 1814 | /* Fall through */ |
| 1815 | |
| 1816 | MATCHED_SOMETHING: |
| 1817 | switch(rc) |
| 1818 | { |
| 1819 | case OK: |
| 1820 | *yield = testfor; |
| 1821 | break; |
| 1822 | |
| 1823 | case FAIL: |
| 1824 | *yield = !testfor; |
| 1825 | break; |
| 1826 | |
| 1827 | case DEFER: |
| 1828 | expand_string_message = string_sprintf("unable to complete match " |
| 1829 | "against \"%s\": %s", sub[1], search_error_message); |
| 1830 | return NULL; |
| 1831 | } |
| 1832 | |
| 1833 | break; |
| 1834 | |
| 1835 | /* Various "encrypted" comparisons. If the second string starts with |
| 1836 | "{" then an encryption type is given. Default to crypt() or crypt16() |
| 1837 | (build-time choice). */ |
| 1838 | |
| 1839 | case ECOND_CRYPTEQ: |
| 1840 | #ifndef SUPPORT_CRYPTEQ |
| 1841 | goto COND_FAILED_NOT_COMPILED; |
| 1842 | #else |
| 1843 | if (strncmpic(sub[1], US"{md5}", 5) == 0) |
| 1844 | { |
| 1845 | int sublen = Ustrlen(sub[1]+5); |
| 1846 | md5 base; |
| 1847 | uschar digest[16]; |
| 1848 | |
| 1849 | md5_start(&base); |
| 1850 | md5_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest); |
| 1851 | |
| 1852 | /* If the length that we are comparing against is 24, the MD5 digest |
| 1853 | is expressed as a base64 string. This is the way LDAP does it. However, |
| 1854 | some other software uses a straightforward hex representation. We assume |
| 1855 | this if the length is 32. Other lengths fail. */ |
| 1856 | |
| 1857 | if (sublen == 24) |
| 1858 | { |
| 1859 | uschar *coded = auth_b64encode((uschar *)digest, 16); |
| 1860 | DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n" |
| 1861 | " subject=%s\n crypted=%s\n", coded, sub[1]+5); |
| 1862 | *yield = (Ustrcmp(coded, sub[1]+5) == 0) == testfor; |
| 1863 | } |
| 1864 | else if (sublen == 32) |
| 1865 | { |
| 1866 | int i; |
| 1867 | uschar coded[36]; |
| 1868 | for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); |
| 1869 | coded[32] = 0; |
| 1870 | DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n" |
| 1871 | " subject=%s\n crypted=%s\n", coded, sub[1]+5); |
| 1872 | *yield = (strcmpic(coded, sub[1]+5) == 0) == testfor; |
| 1873 | } |
| 1874 | else |
| 1875 | { |
| 1876 | DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: " |
| 1877 | "fail\n crypted=%s\n", sub[1]+5); |
| 1878 | *yield = !testfor; |
| 1879 | } |
| 1880 | } |
| 1881 | |
| 1882 | else if (strncmpic(sub[1], US"{sha1}", 6) == 0) |
| 1883 | { |
| 1884 | int sublen = Ustrlen(sub[1]+6); |
| 1885 | sha1 base; |
| 1886 | uschar digest[20]; |
| 1887 | |
| 1888 | sha1_start(&base); |
| 1889 | sha1_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest); |
| 1890 | |
| 1891 | /* If the length that we are comparing against is 28, assume the SHA1 |
| 1892 | digest is expressed as a base64 string. If the length is 40, assume a |
| 1893 | straightforward hex representation. Other lengths fail. */ |
| 1894 | |
| 1895 | if (sublen == 28) |
| 1896 | { |
| 1897 | uschar *coded = auth_b64encode((uschar *)digest, 20); |
| 1898 | DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n" |
| 1899 | " subject=%s\n crypted=%s\n", coded, sub[1]+6); |
| 1900 | *yield = (Ustrcmp(coded, sub[1]+6) == 0) == testfor; |
| 1901 | } |
| 1902 | else if (sublen == 40) |
| 1903 | { |
| 1904 | int i; |
| 1905 | uschar coded[44]; |
| 1906 | for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); |
| 1907 | coded[40] = 0; |
| 1908 | DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n" |
| 1909 | " subject=%s\n crypted=%s\n", coded, sub[1]+6); |
| 1910 | *yield = (strcmpic(coded, sub[1]+6) == 0) == testfor; |
| 1911 | } |
| 1912 | else |
| 1913 | { |
| 1914 | DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: " |
| 1915 | "fail\n crypted=%s\n", sub[1]+6); |
| 1916 | *yield = !testfor; |
| 1917 | } |
| 1918 | } |
| 1919 | |
| 1920 | else /* {crypt} or {crypt16} and non-{ at start */ |
| 1921 | { |
| 1922 | int which = 0; |
| 1923 | uschar *coded; |
| 1924 | |
| 1925 | if (strncmpic(sub[1], US"{crypt}", 7) == 0) |
| 1926 | { |
| 1927 | sub[1] += 7; |
| 1928 | which = 1; |
| 1929 | } |
| 1930 | else if (strncmpic(sub[1], US"{crypt16}", 9) == 0) |
| 1931 | { |
| 1932 | sub[1] += 9; |
| 1933 | which = 2; |
| 1934 | } |
| 1935 | else if (sub[1][0] == '{') |
| 1936 | { |
| 1937 | expand_string_message = string_sprintf("unknown encryption mechanism " |
| 1938 | "in \"%s\"", sub[1]); |
| 1939 | return NULL; |
| 1940 | } |
| 1941 | |
| 1942 | switch(which) |
| 1943 | { |
| 1944 | case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break; |
| 1945 | case 1: coded = US crypt(CS sub[0], CS sub[1]); break; |
| 1946 | default: coded = US crypt16(CS sub[0], CS sub[1]); break; |
| 1947 | } |
| 1948 | |
| 1949 | #define STR(s) # s |
| 1950 | #define XSTR(s) STR(s) |
| 1951 | DEBUG(D_auth) debug_printf("crypteq: using %s()\n" |
| 1952 | " subject=%s\n crypted=%s\n", |
| 1953 | (which == 0)? XSTR(DEFAULT_CRYPT) : (which == 1)? "crypt" : "crypt16", |
| 1954 | coded, sub[1]); |
| 1955 | #undef STR |
| 1956 | #undef XSTR |
| 1957 | |
| 1958 | /* If the encrypted string contains fewer than two characters (for the |
| 1959 | salt), force failure. Otherwise we get false positives: with an empty |
| 1960 | string the yield of crypt() is an empty string! */ |
| 1961 | |
| 1962 | *yield = (Ustrlen(sub[1]) < 2)? !testfor : |
| 1963 | (Ustrcmp(coded, sub[1]) == 0) == testfor; |
| 1964 | } |
| 1965 | break; |
| 1966 | #endif /* SUPPORT_CRYPTEQ */ |
| 1967 | } /* Switch for comparison conditions */ |
| 1968 | |
| 1969 | return s; /* End of comparison conditions */ |
| 1970 | |
| 1971 | |
| 1972 | /* and/or: computes logical and/or of several conditions */ |
| 1973 | |
| 1974 | case ECOND_AND: |
| 1975 | case ECOND_OR: |
| 1976 | subcondptr = (yield == NULL)? NULL : &tempcond; |
| 1977 | combined_cond = (cond_type == ECOND_AND); |
| 1978 | |
| 1979 | while (isspace(*s)) s++; |
| 1980 | if (*s++ != '{') goto COND_FAILED_CURLY_START; |
| 1981 | |
| 1982 | for (;;) |
| 1983 | { |
| 1984 | while (isspace(*s)) s++; |
| 1985 | if (*s == '}') break; |
| 1986 | if (*s != '{') |
| 1987 | { |
| 1988 | expand_string_message = string_sprintf("each subcondition " |
| 1989 | "inside an \"%s{...}\" condition must be in its own {}", name); |
| 1990 | return NULL; |
| 1991 | } |
| 1992 | |
| 1993 | s = eval_condition(s+1, subcondptr); |
| 1994 | if (s == NULL) |
| 1995 | { |
| 1996 | expand_string_message = string_sprintf("%s inside \"%s{...}\" condition", |
| 1997 | expand_string_message, name); |
| 1998 | return NULL; |
| 1999 | } |
| 2000 | while (isspace(*s)) s++; |
| 2001 | |
| 2002 | if (*s++ != '}') |
| 2003 | { |
| 2004 | expand_string_message = string_sprintf("missing } at end of condition " |
| 2005 | "inside \"%s\" group", name); |
| 2006 | return NULL; |
| 2007 | } |
| 2008 | |
| 2009 | if (yield != NULL) |
| 2010 | { |
| 2011 | if (cond_type == ECOND_AND) |
| 2012 | { |
| 2013 | combined_cond &= tempcond; |
| 2014 | if (!combined_cond) subcondptr = NULL; /* once false, don't */ |
| 2015 | } /* evaluate any more */ |
| 2016 | else |
| 2017 | { |
| 2018 | combined_cond |= tempcond; |
| 2019 | if (combined_cond) subcondptr = NULL; /* once true, don't */ |
| 2020 | } /* evaluate any more */ |
| 2021 | } |
| 2022 | } |
| 2023 | |
| 2024 | if (yield != NULL) *yield = (combined_cond == testfor); |
| 2025 | return ++s; |
| 2026 | |
| 2027 | |
| 2028 | /* Unknown condition */ |
| 2029 | |
| 2030 | default: |
| 2031 | expand_string_message = string_sprintf("unknown condition \"%s\"", name); |
| 2032 | return NULL; |
| 2033 | } /* End switch on condition type */ |
| 2034 | |
| 2035 | /* Missing braces at start and end of data */ |
| 2036 | |
| 2037 | COND_FAILED_CURLY_START: |
| 2038 | expand_string_message = string_sprintf("missing { after \"%s\"", name); |
| 2039 | return NULL; |
| 2040 | |
| 2041 | COND_FAILED_CURLY_END: |
| 2042 | expand_string_message = string_sprintf("missing } at end of \"%s\" condition", |
| 2043 | name); |
| 2044 | return NULL; |
| 2045 | |
| 2046 | /* A condition requires code that is not compiled */ |
| 2047 | |
| 2048 | #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \ |
| 2049 | !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \ |
| 2050 | !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET) |
| 2051 | COND_FAILED_NOT_COMPILED: |
| 2052 | expand_string_message = string_sprintf("support for \"%s\" not compiled", |
| 2053 | name); |
| 2054 | return NULL; |
| 2055 | #endif |
| 2056 | } |
| 2057 | |
| 2058 | |
| 2059 | |
| 2060 | |
| 2061 | /************************************************* |
| 2062 | * Save numerical variables * |
| 2063 | *************************************************/ |
| 2064 | |
| 2065 | /* This function is called from items such as "if" that want to preserve and |
| 2066 | restore the numbered variables. |
| 2067 | |
| 2068 | Arguments: |
| 2069 | save_expand_string points to an array of pointers to set |
| 2070 | save_expand_nlength points to an array of ints for the lengths |
| 2071 | |
| 2072 | Returns: the value of expand max to save |
| 2073 | */ |
| 2074 | |
| 2075 | static int |
| 2076 | save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength) |
| 2077 | { |
| 2078 | int i; |
| 2079 | for (i = 0; i <= expand_nmax; i++) |
| 2080 | { |
| 2081 | save_expand_nstring[i] = expand_nstring[i]; |
| 2082 | save_expand_nlength[i] = expand_nlength[i]; |
| 2083 | } |
| 2084 | return expand_nmax; |
| 2085 | } |
| 2086 | |
| 2087 | |
| 2088 | |
| 2089 | /************************************************* |
| 2090 | * Restore numerical variables * |
| 2091 | *************************************************/ |
| 2092 | |
| 2093 | /* This function restored saved values of numerical strings. |
| 2094 | |
| 2095 | Arguments: |
| 2096 | save_expand_nmax the number of strings to restore |
| 2097 | save_expand_string points to an array of pointers |
| 2098 | save_expand_nlength points to an array of ints |
| 2099 | |
| 2100 | Returns: nothing |
| 2101 | */ |
| 2102 | |
| 2103 | static void |
| 2104 | restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring, |
| 2105 | int *save_expand_nlength) |
| 2106 | { |
| 2107 | int i; |
| 2108 | expand_nmax = save_expand_nmax; |
| 2109 | for (i = 0; i <= expand_nmax; i++) |
| 2110 | { |
| 2111 | expand_nstring[i] = save_expand_nstring[i]; |
| 2112 | expand_nlength[i] = save_expand_nlength[i]; |
| 2113 | } |
| 2114 | } |
| 2115 | |
| 2116 | |
| 2117 | |
| 2118 | |
| 2119 | |
| 2120 | /************************************************* |
| 2121 | * Handle yes/no substrings * |
| 2122 | *************************************************/ |
| 2123 | |
| 2124 | /* This function is used by ${if}, ${lookup} and ${extract} to handle the |
| 2125 | alternative substrings that depend on whether or not the condition was true, |
| 2126 | or the lookup or extraction succeeded. The substrings always have to be |
| 2127 | expanded, to check their syntax, but "skipping" is set when the result is not |
| 2128 | needed - this avoids unnecessary nested lookups. |
| 2129 | |
| 2130 | Arguments: |
| 2131 | skipping TRUE if we were skipping when this item was reached |
| 2132 | yes TRUE if the first string is to be used, else use the second |
| 2133 | save_lookup a value to put back into lookup_value before the 2nd expansion |
| 2134 | sptr points to the input string pointer |
| 2135 | yieldptr points to the output string pointer |
| 2136 | sizeptr points to the output string size |
| 2137 | ptrptr points to the output string pointer |
| 2138 | type "lookup" or "if" or "extract" or "run", for error message |
| 2139 | |
| 2140 | Returns: 0 OK; lookup_value has been reset to save_lookup |
| 2141 | 1 expansion failed |
| 2142 | 2 expansion failed because of bracketing error |
| 2143 | */ |
| 2144 | |
| 2145 | static int |
| 2146 | process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, uschar **sptr, |
| 2147 | uschar **yieldptr, int *sizeptr, int *ptrptr, uschar *type) |
| 2148 | { |
| 2149 | int rc = 0; |
| 2150 | uschar *s = *sptr; /* Local value */ |
| 2151 | uschar *sub1, *sub2; |
| 2152 | |
| 2153 | /* If there are no following strings, we substitute the contents of $value for |
| 2154 | lookups and for extractions in the success case. In the fail case, nothing is |
| 2155 | substituted. In the case of "if", lack of following strings is an error. */ |
| 2156 | |
| 2157 | while (isspace(*s)) s++; |
| 2158 | if (*s == '}') |
| 2159 | { |
| 2160 | if (type[0] == 'i') goto FAILED_CURLY; |
| 2161 | if (yes && lookup_value != NULL) |
| 2162 | *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, lookup_value, |
| 2163 | Ustrlen(lookup_value)); |
| 2164 | lookup_value = save_lookup; |
| 2165 | s++; |
| 2166 | goto RETURN; |
| 2167 | } |
| 2168 | |
| 2169 | /* Expand the first substring. Forced failures are noticed only if we actually |
| 2170 | want this string. Set skipping in the call in the fail case (this will always |
| 2171 | be the case if we were already skipping). */ |
| 2172 | |
| 2173 | sub1 = expand_string_internal(s+1, TRUE, &s, !yes); |
| 2174 | if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED; |
| 2175 | expand_string_forcedfail = FALSE; |
| 2176 | if (*s++ != '}') goto FAILED_CURLY; |
| 2177 | |
| 2178 | /* If we want the first string, add it to the output */ |
| 2179 | |
| 2180 | if (yes) |
| 2181 | *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub1, Ustrlen(sub1)); |
| 2182 | |
| 2183 | /* If this is called from a lookup or an extract, we want to restore $value to |
| 2184 | what it was at the start of the item, so that it has this value during the |
| 2185 | second string expansion. For the call from "if" to this function, save_lookup |
| 2186 | is set to lookup_value, so that this statement does nothing. */ |
| 2187 | |
| 2188 | lookup_value = save_lookup; |
| 2189 | |
| 2190 | /* There now follows either another substring, or "fail", or nothing. This |
| 2191 | time, forced failures are noticed only if we want the second string. We must |
| 2192 | set skipping in the nested call if we don't want this string, or if we were |
| 2193 | already skipping. */ |
| 2194 | |
| 2195 | while (isspace(*s)) s++; |
| 2196 | if (*s == '{') |
| 2197 | { |
| 2198 | sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping); |
| 2199 | if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED; |
| 2200 | expand_string_forcedfail = FALSE; |
| 2201 | if (*s++ != '}') goto FAILED_CURLY; |
| 2202 | |
| 2203 | /* If we want the second string, add it to the output */ |
| 2204 | |
| 2205 | if (!yes) |
| 2206 | *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub2, Ustrlen(sub2)); |
| 2207 | } |
| 2208 | |
| 2209 | /* If there is no second string, but the word "fail" is present when the use of |
| 2210 | the second string is wanted, set a flag indicating it was a forced failure |
| 2211 | rather than a syntactic error. Swallow the terminating } in case this is nested |
| 2212 | inside another lookup or if or extract. */ |
| 2213 | |
| 2214 | else if (*s != '}') |
| 2215 | { |
| 2216 | uschar name[256]; |
| 2217 | s = read_name(name, sizeof(name), s, US"_"); |
| 2218 | if (Ustrcmp(name, "fail") == 0) |
| 2219 | { |
| 2220 | if (!yes && !skipping) |
| 2221 | { |
| 2222 | while (isspace(*s)) s++; |
| 2223 | if (*s++ != '}') goto FAILED_CURLY; |
| 2224 | expand_string_message = |
| 2225 | string_sprintf("\"%s\" failed and \"fail\" requested", type); |
| 2226 | expand_string_forcedfail = TRUE; |
| 2227 | goto FAILED; |
| 2228 | } |
| 2229 | } |
| 2230 | else |
| 2231 | { |
| 2232 | expand_string_message = |
| 2233 | string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type); |
| 2234 | goto FAILED; |
| 2235 | } |
| 2236 | } |
| 2237 | |
| 2238 | /* All we have to do now is to check on the final closing brace. */ |
| 2239 | |
| 2240 | while (isspace(*s)) s++; |
| 2241 | if (*s++ == '}') goto RETURN; |
| 2242 | |
| 2243 | /* Get here if there is a bracketing failure */ |
| 2244 | |
| 2245 | FAILED_CURLY: |
| 2246 | rc++; |
| 2247 | |
| 2248 | /* Get here for other failures */ |
| 2249 | |
| 2250 | FAILED: |
| 2251 | rc++; |
| 2252 | |
| 2253 | /* Update the input pointer value before returning */ |
| 2254 | |
| 2255 | RETURN: |
| 2256 | *sptr = s; |
| 2257 | return rc; |
| 2258 | } |
| 2259 | |
| 2260 | |
| 2261 | |
| 2262 | |
| 2263 | |
| 2264 | |
| 2265 | /************************************************* |
| 2266 | * Handle MD5 or SHA-1 computation for HMAC * |
| 2267 | *************************************************/ |
| 2268 | |
| 2269 | /* These are some wrapping functions that enable the HMAC code to be a bit |
| 2270 | cleaner. A good compiler will spot the tail recursion. |
| 2271 | |
| 2272 | Arguments: |
| 2273 | type HMAC_MD5 or HMAC_SHA1 |
| 2274 | remaining are as for the cryptographic hash functions |
| 2275 | |
| 2276 | Returns: nothing |
| 2277 | */ |
| 2278 | |
| 2279 | static void |
| 2280 | chash_start(int type, void *base) |
| 2281 | { |
| 2282 | if (type == HMAC_MD5) |
| 2283 | md5_start((md5 *)base); |
| 2284 | else |
| 2285 | sha1_start((sha1 *)base); |
| 2286 | } |
| 2287 | |
| 2288 | static void |
| 2289 | chash_mid(int type, void *base, uschar *string) |
| 2290 | { |
| 2291 | if (type == HMAC_MD5) |
| 2292 | md5_mid((md5 *)base, string); |
| 2293 | else |
| 2294 | sha1_mid((sha1 *)base, string); |
| 2295 | } |
| 2296 | |
| 2297 | static void |
| 2298 | chash_end(int type, void *base, uschar *string, int length, uschar *digest) |
| 2299 | { |
| 2300 | if (type == HMAC_MD5) |
| 2301 | md5_end((md5 *)base, string, length, digest); |
| 2302 | else |
| 2303 | sha1_end((sha1 *)base, string, length, digest); |
| 2304 | } |
| 2305 | |
| 2306 | |
| 2307 | |
| 2308 | |
| 2309 | |
| 2310 | /************************************************* |
| 2311 | * Join a file onto the output string * |
| 2312 | *************************************************/ |
| 2313 | |
| 2314 | /* This is used for readfile and after a run expansion. It joins the contents |
| 2315 | of a file onto the output string, globally replacing newlines with a given |
| 2316 | string (optionally). The file is closed at the end. |
| 2317 | |
| 2318 | Arguments: |
| 2319 | f the FILE |
| 2320 | yield pointer to the expandable string |
| 2321 | sizep pointer to the current size |
| 2322 | ptrp pointer to the current position |
| 2323 | eol newline replacement string, or NULL |
| 2324 | |
| 2325 | Returns: new value of string pointer |
| 2326 | */ |
| 2327 | |
| 2328 | static uschar * |
| 2329 | cat_file(FILE *f, uschar *yield, int *sizep, int *ptrp, uschar *eol) |
| 2330 | { |
| 2331 | int eollen; |
| 2332 | uschar buffer[1024]; |
| 2333 | |
| 2334 | eollen = (eol == NULL)? 0 : Ustrlen(eol); |
| 2335 | |
| 2336 | while (Ufgets(buffer, sizeof(buffer), f) != NULL) |
| 2337 | { |
| 2338 | int len = Ustrlen(buffer); |
| 2339 | if (eol != NULL && buffer[len-1] == '\n') len--; |
| 2340 | yield = string_cat(yield, sizep, ptrp, buffer, len); |
| 2341 | if (buffer[len] != 0) |
| 2342 | yield = string_cat(yield, sizep, ptrp, eol, eollen); |
| 2343 | } |
| 2344 | |
| 2345 | if (yield != NULL) yield[*ptrp] = 0; |
| 2346 | |
| 2347 | return yield; |
| 2348 | } |
| 2349 | |
| 2350 | |
| 2351 | |
| 2352 | |
| 2353 | /************************************************* |
| 2354 | * Evaluate numeric expression * |
| 2355 | *************************************************/ |
| 2356 | |
| 2357 | /* This is a set of mutually recursive functions that evaluate a simple |
| 2358 | arithmetic expression involving only + - * / and parentheses. The only one that |
| 2359 | is called from elsewhere is eval_expr, whose interface is: |
| 2360 | |
| 2361 | Arguments: |
| 2362 | sptr pointer to the pointer to the string - gets updated |
| 2363 | decimal TRUE if numbers are to be assumed decimal |
| 2364 | error pointer to where to put an error message - must be NULL on input |
| 2365 | endket TRUE if ')' must terminate - FALSE for external call |
| 2366 | |
| 2367 | |
| 2368 | Returns: on success: the value of the expression, with *error still NULL |
| 2369 | on failure: an undefined value, with *error = a message |
| 2370 | */ |
| 2371 | |
| 2372 | static int eval_sumterm(uschar **, BOOL, uschar **); |
| 2373 | |
| 2374 | static int |
| 2375 | eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket) |
| 2376 | { |
| 2377 | uschar *s = *sptr; |
| 2378 | int x = eval_sumterm(&s, decimal, error); |
| 2379 | if (*error == NULL) |
| 2380 | { |
| 2381 | while (*s == '+' || *s == '-') |
| 2382 | { |
| 2383 | int op = *s++; |
| 2384 | int y = eval_sumterm(&s, decimal, error); |
| 2385 | if (*error != NULL) break; |
| 2386 | if (op == '+') x += y; else x -= y; |
| 2387 | } |
| 2388 | if (*error == NULL) |
| 2389 | { |
| 2390 | if (endket) |
| 2391 | { |
| 2392 | if (*s != ')') |
| 2393 | *error = US"expecting closing parenthesis"; |
| 2394 | else |
| 2395 | while (isspace(*(++s))); |
| 2396 | } |
| 2397 | else if (*s != 0) *error = US"expecting + or -"; |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | *sptr = s; |
| 2402 | return x; |
| 2403 | } |
| 2404 | |
| 2405 | static int |
| 2406 | eval_term(uschar **sptr, BOOL decimal, uschar **error) |
| 2407 | { |
| 2408 | register int c; |
| 2409 | int n; |
| 2410 | uschar *s = *sptr; |
| 2411 | while (isspace(*s)) s++; |
| 2412 | c = *s; |
| 2413 | if (isdigit(c) || ((c == '-' || c == '+') && isdigit(s[1]))) |
| 2414 | { |
| 2415 | int count; |
| 2416 | (void)sscanf(CS s, (decimal? "%d%n" : "%i%n"), &n, &count); |
| 2417 | s += count; |
| 2418 | if (tolower(*s) == 'k') { n *= 1024; s++; } |
| 2419 | else if (tolower(*s) == 'm') { n *= 1024*1024; s++; } |
| 2420 | while (isspace (*s)) s++; |
| 2421 | } |
| 2422 | else if (c == '(') |
| 2423 | { |
| 2424 | s++; |
| 2425 | n = eval_expr(&s, decimal, error, 1); |
| 2426 | } |
| 2427 | else |
| 2428 | { |
| 2429 | *error = US"expecting number or opening parenthesis"; |
| 2430 | n = 0; |
| 2431 | } |
| 2432 | *sptr = s; |
| 2433 | return n; |
| 2434 | } |
| 2435 | |
| 2436 | static int eval_sumterm(uschar **sptr, BOOL decimal, uschar **error) |
| 2437 | { |
| 2438 | uschar *s = *sptr; |
| 2439 | int x = eval_term(&s, decimal, error); |
| 2440 | if (*error == NULL) |
| 2441 | { |
| 2442 | while (*s == '*' || *s == '/') |
| 2443 | { |
| 2444 | int op = *s++; |
| 2445 | int y = eval_term(&s, decimal, error); |
| 2446 | if (*error != NULL) break; |
| 2447 | if (op == '*') x *= y; else x /= y; |
| 2448 | } |
| 2449 | } |
| 2450 | *sptr = s; |
| 2451 | return x; |
| 2452 | } |
| 2453 | |
| 2454 | |
| 2455 | |
| 2456 | |
| 2457 | /************************************************* |
| 2458 | * Expand string * |
| 2459 | *************************************************/ |
| 2460 | |
| 2461 | /* Returns either an unchanged string, or the expanded string in stacking pool |
| 2462 | store. Interpreted sequences are: |
| 2463 | |
| 2464 | \... normal escaping rules |
| 2465 | $name substitutes the variable |
| 2466 | ${name} ditto |
| 2467 | ${op:string} operates on the expanded string value |
| 2468 | ${item{arg1}{arg2}...} expands the args and then does the business |
| 2469 | some literal args are not enclosed in {} |
| 2470 | |
| 2471 | There are now far too many operators and item types to make it worth listing |
| 2472 | them here in detail any more. |
| 2473 | |
| 2474 | We use an internal routine recursively to handle embedded substrings. The |
| 2475 | external function follows. The yield is NULL if the expansion failed, and there |
| 2476 | are two cases: if something collapsed syntactically, or if "fail" was given |
| 2477 | as the action on a lookup failure. These can be distinguised by looking at the |
| 2478 | variable expand_string_forcedfail, which is TRUE in the latter case. |
| 2479 | |
| 2480 | The skipping flag is set true when expanding a substring that isn't actually |
| 2481 | going to be used (after "if" or "lookup") and it prevents lookups from |
| 2482 | happening lower down. |
| 2483 | |
| 2484 | Store usage: At start, a store block of the length of the input plus 64 |
| 2485 | is obtained. This is expanded as necessary by string_cat(), which might have to |
| 2486 | get a new block, or might be able to expand the original. At the end of the |
| 2487 | function we can release any store above that portion of the yield block that |
| 2488 | was actually used. In many cases this will be optimal. |
| 2489 | |
| 2490 | However: if the first item in the expansion is a variable name or header name, |
| 2491 | we reset the store before processing it; if the result is in fresh store, we |
| 2492 | use that without copying. This is helpful for expanding strings like |
| 2493 | $message_headers which can get very long. |
| 2494 | |
| 2495 | Arguments: |
| 2496 | string the string to be expanded |
| 2497 | ket_ends true if expansion is to stop at } |
| 2498 | left if not NULL, a pointer to the first character after the |
| 2499 | expansion is placed here (typically used with ket_ends) |
| 2500 | skipping TRUE for recursive calls when the value isn't actually going |
| 2501 | to be used (to allow for optimisation) |
| 2502 | |
| 2503 | Returns: NULL if expansion fails: |
| 2504 | expand_string_forcedfail is set TRUE if failure was forced |
| 2505 | expand_string_message contains a textual error message |
| 2506 | a pointer to the expanded string on success |
| 2507 | */ |
| 2508 | |
| 2509 | static uschar * |
| 2510 | expand_string_internal(uschar *string, BOOL ket_ends, uschar **left, |
| 2511 | BOOL skipping) |
| 2512 | { |
| 2513 | int ptr = 0; |
| 2514 | int size = Ustrlen(string)+ 64; |
| 2515 | int item_type; |
| 2516 | uschar *yield = store_get(size); |
| 2517 | uschar *s = string; |
| 2518 | uschar *save_expand_nstring[EXPAND_MAXN+1]; |
| 2519 | int save_expand_nlength[EXPAND_MAXN+1]; |
| 2520 | |
| 2521 | expand_string_forcedfail = FALSE; |
| 2522 | expand_string_message = US""; |
| 2523 | |
| 2524 | while (*s != 0) |
| 2525 | { |
| 2526 | uschar *value; |
| 2527 | uschar name[256]; |
| 2528 | |
| 2529 | /* \ escapes the next character, which must exist, or else |
| 2530 | the expansion fails. There's a special escape, \N, which causes |
| 2531 | copying of the subject verbatim up to the next \N. Otherwise, |
| 2532 | the escapes are the standard set. */ |
| 2533 | |
| 2534 | if (*s == '\\') |
| 2535 | { |
| 2536 | if (s[1] == 0) |
| 2537 | { |
| 2538 | expand_string_message = US"\\ at end of string"; |
| 2539 | goto EXPAND_FAILED; |
| 2540 | } |
| 2541 | |
| 2542 | if (s[1] == 'N') |
| 2543 | { |
| 2544 | uschar *t = s + 2; |
| 2545 | for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break; |
| 2546 | yield = string_cat(yield, &size, &ptr, t, s - t); |
| 2547 | if (*s != 0) s += 2; |
| 2548 | } |
| 2549 | |
| 2550 | else |
| 2551 | { |
| 2552 | uschar ch[1]; |
| 2553 | ch[0] = string_interpret_escape(&s); |
| 2554 | s++; |
| 2555 | yield = string_cat(yield, &size, &ptr, ch, 1); |
| 2556 | } |
| 2557 | |
| 2558 | continue; |
| 2559 | } |
| 2560 | |
| 2561 | /* Anything other than $ is just copied verbatim, unless we are |
| 2562 | looking for a terminating } character. */ |
| 2563 | |
| 2564 | if (ket_ends && *s == '}') break; |
| 2565 | |
| 2566 | if (*s != '$') |
| 2567 | { |
| 2568 | yield = string_cat(yield, &size, &ptr, s++, 1); |
| 2569 | continue; |
| 2570 | } |
| 2571 | |
| 2572 | /* No { after the $ - must be a plain name or a number for string |
| 2573 | match variable. There has to be a fudge for variables that are the |
| 2574 | names of header fields preceded by "$header_" because header field |
| 2575 | names can contain any printing characters except space and colon. |
| 2576 | For those that don't like typing this much, "$h_" is a synonym for |
| 2577 | "$header_". A non-existent header yields a NULL value; nothing is |
| 2578 | inserted. */ |
| 2579 | |
| 2580 | if (isalpha((*(++s)))) |
| 2581 | { |
| 2582 | int len; |
| 2583 | int newsize = 0; |
| 2584 | |
| 2585 | s = read_name(name, sizeof(name), s, US"_"); |
| 2586 | |
| 2587 | /* If this is the first thing to be expanded, release the pre-allocated |
| 2588 | buffer. */ |
| 2589 | |
| 2590 | if (ptr == 0 && yield != NULL) |
| 2591 | { |
| 2592 | store_reset(yield); |
| 2593 | yield = NULL; |
| 2594 | size = 0; |
| 2595 | } |
| 2596 | |
| 2597 | /* Header */ |
| 2598 | |
| 2599 | if (Ustrncmp(name, "h_", 2) == 0 || |
| 2600 | Ustrncmp(name, "rh_", 3) == 0 || |
| 2601 | Ustrncmp(name, "bh_", 3) == 0 || |
| 2602 | Ustrncmp(name, "header_", 7) == 0 || |
| 2603 | Ustrncmp(name, "rheader_", 8) == 0 || |
| 2604 | Ustrncmp(name, "bheader_", 8) == 0) |
| 2605 | { |
| 2606 | BOOL want_raw = (name[0] == 'r')? TRUE : FALSE; |
| 2607 | uschar *charset = (name[0] == 'b')? NULL : headers_charset; |
| 2608 | s = read_header_name(name, sizeof(name), s); |
| 2609 | value = find_header(name, FALSE, &newsize, want_raw, charset); |
| 2610 | |
| 2611 | /* If we didn't find the header, and the header contains a closing brace |
| 2612 | characters, this may be a user error where the terminating colon |
| 2613 | has been omitted. Set a flag to adjust the error message in this case. |
| 2614 | But there is no error here - nothing gets inserted. */ |
| 2615 | |
| 2616 | if (value == NULL) |
| 2617 | { |
| 2618 | if (Ustrchr(name, '}') != NULL) malformed_header = TRUE; |
| 2619 | continue; |
| 2620 | } |
| 2621 | } |
| 2622 | |
| 2623 | /* Variable */ |
| 2624 | |
| 2625 | else |
| 2626 | { |
| 2627 | value = find_variable(name, FALSE, skipping, &newsize); |
| 2628 | if (value == NULL) |
| 2629 | { |
| 2630 | expand_string_message = |
| 2631 | string_sprintf("unknown variable name \"%s\"", name); |
| 2632 | goto EXPAND_FAILED; |
| 2633 | } |
| 2634 | } |
| 2635 | |
| 2636 | /* If the data is known to be in a new buffer, newsize will be set to the |
| 2637 | size of that buffer. If this is the first thing in an expansion string, |
| 2638 | yield will be NULL; just point it at the new store instead of copying. Many |
| 2639 | expansion strings contain just one reference, so this is a useful |
| 2640 | optimization, especially for humungous headers. */ |
| 2641 | |
| 2642 | len = Ustrlen(value); |
| 2643 | if (yield == NULL && newsize != 0) |
| 2644 | { |
| 2645 | yield = value; |
| 2646 | size = newsize; |
| 2647 | ptr = len; |
| 2648 | } |
| 2649 | else yield = string_cat(yield, &size, &ptr, value, len); |
| 2650 | |
| 2651 | continue; |
| 2652 | } |
| 2653 | |
| 2654 | if (isdigit(*s)) |
| 2655 | { |
| 2656 | int n; |
| 2657 | s = read_number(&n, s); |
| 2658 | if (n >= 0 && n <= expand_nmax) |
| 2659 | yield = string_cat(yield, &size, &ptr, expand_nstring[n], |
| 2660 | expand_nlength[n]); |
| 2661 | continue; |
| 2662 | } |
| 2663 | |
| 2664 | /* Otherwise, if there's no '{' after $ it's an error. */ |
| 2665 | |
| 2666 | if (*s != '{') |
| 2667 | { |
| 2668 | expand_string_message = US"$ not followed by letter, digit, or {"; |
| 2669 | goto EXPAND_FAILED; |
| 2670 | } |
| 2671 | |
| 2672 | /* After { there can be various things, but they all start with |
| 2673 | an initial word, except for a number for a string match variable. */ |
| 2674 | |
| 2675 | if (isdigit((*(++s)))) |
| 2676 | { |
| 2677 | int n; |
| 2678 | s = read_number(&n, s); |
| 2679 | if (*s++ != '}') |
| 2680 | { |
| 2681 | expand_string_message = US"} expected after number"; |
| 2682 | goto EXPAND_FAILED; |
| 2683 | } |
| 2684 | if (n >= 0 && n <= expand_nmax) |
| 2685 | yield = string_cat(yield, &size, &ptr, expand_nstring[n], |
| 2686 | expand_nlength[n]); |
| 2687 | continue; |
| 2688 | } |
| 2689 | |
| 2690 | if (!isalpha(*s)) |
| 2691 | { |
| 2692 | expand_string_message = US"letter or digit expected after ${"; |
| 2693 | goto EXPAND_FAILED; |
| 2694 | } |
| 2695 | |
| 2696 | /* Allow "-" in names to cater for substrings with negative |
| 2697 | arguments. Since we are checking for known names after { this is |
| 2698 | OK. */ |
| 2699 | |
| 2700 | s = read_name(name, sizeof(name), s, US"_-"); |
| 2701 | item_type = chop_match(name, item_table, sizeof(item_table)/sizeof(uschar *)); |
| 2702 | |
| 2703 | switch(item_type) |
| 2704 | { |
| 2705 | /* Handle conditionals - preserve the values of the numerical expansion |
| 2706 | variables in case they get changed by a regular expression match in the |
| 2707 | condition. If not, they retain their external settings. At the end |
| 2708 | of this "if" section, they get restored to their previous values. */ |
| 2709 | |
| 2710 | case EITEM_IF: |
| 2711 | { |
| 2712 | BOOL cond = FALSE; |
| 2713 | uschar *next_s; |
| 2714 | int save_expand_nmax = |
| 2715 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 2716 | |
| 2717 | while (isspace(*s)) s++; |
| 2718 | next_s = eval_condition(s, skipping? NULL : &cond); |
| 2719 | if (next_s == NULL) goto EXPAND_FAILED; /* message already set */ |
| 2720 | |
| 2721 | DEBUG(D_expand) |
| 2722 | debug_printf("condition: %.*s\n result: %s\n", (int)(next_s - s), s, |
| 2723 | cond? "true" : "false"); |
| 2724 | |
| 2725 | s = next_s; |
| 2726 | |
| 2727 | /* The handling of "yes" and "no" result strings is now in a separate |
| 2728 | function that is also used by ${lookup} and ${extract} and ${run}. */ |
| 2729 | |
| 2730 | switch(process_yesno( |
| 2731 | skipping, /* were previously skipping */ |
| 2732 | cond, /* success/failure indicator */ |
| 2733 | lookup_value, /* value to reset for string2 */ |
| 2734 | &s, /* input pointer */ |
| 2735 | &yield, /* output pointer */ |
| 2736 | &size, /* output size */ |
| 2737 | &ptr, /* output current point */ |
| 2738 | US"if")) /* condition type */ |
| 2739 | { |
| 2740 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 2741 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 2742 | } |
| 2743 | |
| 2744 | /* Restore external setting of expansion variables for continuation |
| 2745 | at this level. */ |
| 2746 | |
| 2747 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 2748 | save_expand_nlength); |
| 2749 | continue; |
| 2750 | } |
| 2751 | |
| 2752 | /* Handle database lookups unless locked out. If "skipping" is TRUE, we are |
| 2753 | expanding an internal string that isn't actually going to be used. All we |
| 2754 | need to do is check the syntax, so don't do a lookup at all. Preserve the |
| 2755 | values of the numerical expansion variables in case they get changed by a |
| 2756 | partial lookup. If not, they retain their external settings. At the end |
| 2757 | of this "lookup" section, they get restored to their previous values. */ |
| 2758 | |
| 2759 | case EITEM_LOOKUP: |
| 2760 | { |
| 2761 | int stype, partial, affixlen, starflags; |
| 2762 | int expand_setup = 0; |
| 2763 | int nameptr = 0; |
| 2764 | uschar *key, *filename, *affix; |
| 2765 | uschar *save_lookup_value = lookup_value; |
| 2766 | int save_expand_nmax = |
| 2767 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 2768 | |
| 2769 | if ((expand_forbid & RDO_LOOKUP) != 0) |
| 2770 | { |
| 2771 | expand_string_message = US"lookup expansions are not permitted"; |
| 2772 | goto EXPAND_FAILED; |
| 2773 | } |
| 2774 | |
| 2775 | /* Get the key we are to look up for single-key+file style lookups. |
| 2776 | Otherwise set the key NULL pro-tem. */ |
| 2777 | |
| 2778 | while (isspace(*s)) s++; |
| 2779 | if (*s == '{') |
| 2780 | { |
| 2781 | key = expand_string_internal(s+1, TRUE, &s, skipping); |
| 2782 | if (key == NULL) goto EXPAND_FAILED; |
| 2783 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 2784 | while (isspace(*s)) s++; |
| 2785 | } |
| 2786 | else key = NULL; |
| 2787 | |
| 2788 | /* Find out the type of database */ |
| 2789 | |
| 2790 | if (!isalpha(*s)) |
| 2791 | { |
| 2792 | expand_string_message = US"missing lookup type"; |
| 2793 | goto EXPAND_FAILED; |
| 2794 | } |
| 2795 | |
| 2796 | /* The type is a string that may contain special characters of various |
| 2797 | kinds. Allow everything except space or { to appear; the actual content |
| 2798 | is checked by search_findtype_partial. */ |
| 2799 | |
| 2800 | while (*s != 0 && *s != '{' && !isspace(*s)) |
| 2801 | { |
| 2802 | if (nameptr < sizeof(name) - 1) name[nameptr++] = *s; |
| 2803 | s++; |
| 2804 | } |
| 2805 | name[nameptr] = 0; |
| 2806 | while (isspace(*s)) s++; |
| 2807 | |
| 2808 | /* Now check for the individual search type and any partial or default |
| 2809 | options. Only those types that are actually in the binary are valid. */ |
| 2810 | |
| 2811 | stype = search_findtype_partial(name, &partial, &affix, &affixlen, |
| 2812 | &starflags); |
| 2813 | if (stype < 0) |
| 2814 | { |
| 2815 | expand_string_message = search_error_message; |
| 2816 | goto EXPAND_FAILED; |
| 2817 | } |
| 2818 | |
| 2819 | /* Check that a key was provided for those lookup types that need it, |
| 2820 | and was not supplied for those that use the query style. */ |
| 2821 | |
| 2822 | if (!mac_islookup(stype, lookup_querystyle)) |
| 2823 | { |
| 2824 | if (key == NULL) |
| 2825 | { |
| 2826 | expand_string_message = string_sprintf("missing {key} for single-" |
| 2827 | "key \"%s\" lookup", name); |
| 2828 | goto EXPAND_FAILED; |
| 2829 | } |
| 2830 | } |
| 2831 | else |
| 2832 | { |
| 2833 | if (key != NULL) |
| 2834 | { |
| 2835 | expand_string_message = string_sprintf("a single key was given for " |
| 2836 | "lookup type \"%s\", which is not a single-key lookup type", name); |
| 2837 | goto EXPAND_FAILED; |
| 2838 | } |
| 2839 | } |
| 2840 | |
| 2841 | /* Get the next string in brackets and expand it. It is the file name for |
| 2842 | single-key+file lookups, and the whole query otherwise. */ |
| 2843 | |
| 2844 | if (*s != '{') goto EXPAND_FAILED_CURLY; |
| 2845 | filename = expand_string_internal(s+1, TRUE, &s, skipping); |
| 2846 | if (filename == NULL) goto EXPAND_FAILED; |
| 2847 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 2848 | while (isspace(*s)) s++; |
| 2849 | |
| 2850 | /* If this isn't a single-key+file lookup, re-arrange the variables |
| 2851 | to be appropriate for the search_ functions. */ |
| 2852 | |
| 2853 | if (key == NULL) |
| 2854 | { |
| 2855 | key = filename; |
| 2856 | filename = NULL; |
| 2857 | } |
| 2858 | |
| 2859 | /* If skipping, don't do the next bit - just lookup_value == NULL, as if |
| 2860 | the entry was not found. Note that there is no search_close() function. |
| 2861 | Files are left open in case of re-use. At suitable places in higher logic, |
| 2862 | search_tidyup() is called to tidy all open files. This can save opening |
| 2863 | the same file several times. However, files may also get closed when |
| 2864 | others are opened, if too many are open at once. The rule is that a |
| 2865 | handle should not be used after a second search_open(). |
| 2866 | |
| 2867 | Request that a partial search sets up $1 and maybe $2 by passing |
| 2868 | expand_setup containing zero. If its value changes, reset expand_nmax, |
| 2869 | since new variables will have been set. Note that at the end of this |
| 2870 | "lookup" section, the old numeric variables are restored. */ |
| 2871 | |
| 2872 | if (skipping) |
| 2873 | lookup_value = NULL; |
| 2874 | else |
| 2875 | { |
| 2876 | void *handle = search_open(filename, stype, 0, NULL, NULL); |
| 2877 | if (handle == NULL) |
| 2878 | { |
| 2879 | expand_string_message = search_error_message; |
| 2880 | goto EXPAND_FAILED; |
| 2881 | } |
| 2882 | lookup_value = search_find(handle, filename, key, partial, affix, |
| 2883 | affixlen, starflags, &expand_setup); |
| 2884 | if (search_find_defer) |
| 2885 | { |
| 2886 | expand_string_message = |
| 2887 | string_sprintf("lookup of \"%s\" gave DEFER: %s", key, |
| 2888 | search_error_message); |
| 2889 | goto EXPAND_FAILED; |
| 2890 | } |
| 2891 | if (expand_setup > 0) expand_nmax = expand_setup; |
| 2892 | } |
| 2893 | |
| 2894 | /* The handling of "yes" and "no" result strings is now in a separate |
| 2895 | function that is also used by ${if} and ${extract}. */ |
| 2896 | |
| 2897 | switch(process_yesno( |
| 2898 | skipping, /* were previously skipping */ |
| 2899 | lookup_value != NULL, /* success/failure indicator */ |
| 2900 | save_lookup_value, /* value to reset for string2 */ |
| 2901 | &s, /* input pointer */ |
| 2902 | &yield, /* output pointer */ |
| 2903 | &size, /* output size */ |
| 2904 | &ptr, /* output current point */ |
| 2905 | US"lookup")) /* condition type */ |
| 2906 | { |
| 2907 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 2908 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 2909 | } |
| 2910 | |
| 2911 | /* Restore external setting of expansion variables for carrying on |
| 2912 | at this level, and continue. */ |
| 2913 | |
| 2914 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 2915 | save_expand_nlength); |
| 2916 | continue; |
| 2917 | } |
| 2918 | |
| 2919 | /* If Perl support is configured, handle calling embedded perl subroutines, |
| 2920 | unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}} |
| 2921 | or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS |
| 2922 | arguments (defined below). */ |
| 2923 | |
| 2924 | #ifdef EXIM_PERL |
| 2925 | #define EXIM_PERL_MAX_ARGS 8 |
| 2926 | |
| 2927 | case EITEM_PERL: |
| 2928 | { |
| 2929 | uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2]; |
| 2930 | uschar *new_yield; |
| 2931 | |
| 2932 | if ((expand_forbid & RDO_PERL) != 0) |
| 2933 | { |
| 2934 | expand_string_message = US"Perl calls are not permitted"; |
| 2935 | goto EXPAND_FAILED; |
| 2936 | } |
| 2937 | |
| 2938 | switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE, |
| 2939 | US"perl")) |
| 2940 | { |
| 2941 | case 1: goto EXPAND_FAILED_CURLY; |
| 2942 | case 2: |
| 2943 | case 3: goto EXPAND_FAILED; |
| 2944 | } |
| 2945 | |
| 2946 | /* If skipping, we don't actually do anything */ |
| 2947 | |
| 2948 | if (skipping) continue; |
| 2949 | |
| 2950 | /* Start the interpreter if necessary */ |
| 2951 | |
| 2952 | if (!opt_perl_started) |
| 2953 | { |
| 2954 | uschar *initerror; |
| 2955 | if (opt_perl_startup == NULL) |
| 2956 | { |
| 2957 | expand_string_message = US"A setting of perl_startup is needed when " |
| 2958 | "using the Perl interpreter"; |
| 2959 | goto EXPAND_FAILED; |
| 2960 | } |
| 2961 | DEBUG(D_any) debug_printf("Starting Perl interpreter\n"); |
| 2962 | initerror = init_perl(opt_perl_startup); |
| 2963 | if (initerror != NULL) |
| 2964 | { |
| 2965 | expand_string_message = |
| 2966 | string_sprintf("error in perl_startup code: %s\n", initerror); |
| 2967 | goto EXPAND_FAILED; |
| 2968 | } |
| 2969 | opt_perl_started = TRUE; |
| 2970 | } |
| 2971 | |
| 2972 | /* Call the function */ |
| 2973 | |
| 2974 | sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL; |
| 2975 | new_yield = call_perl_cat(yield, &size, &ptr, &expand_string_message, |
| 2976 | sub_arg[0], sub_arg + 1); |
| 2977 | |
| 2978 | /* NULL yield indicates failure; if the message pointer has been set to |
| 2979 | NULL, the yield was undef, indicating a forced failure. Otherwise the |
| 2980 | message will indicate some kind of Perl error. */ |
| 2981 | |
| 2982 | if (new_yield == NULL) |
| 2983 | { |
| 2984 | if (expand_string_message == NULL) |
| 2985 | { |
| 2986 | expand_string_message = |
| 2987 | string_sprintf("Perl subroutine \"%s\" returned undef to force " |
| 2988 | "failure", sub_arg[0]); |
| 2989 | expand_string_forcedfail = TRUE; |
| 2990 | } |
| 2991 | goto EXPAND_FAILED; |
| 2992 | } |
| 2993 | |
| 2994 | /* Yield succeeded. Ensure forcedfail is unset, just in case it got |
| 2995 | set during a callback from Perl. */ |
| 2996 | |
| 2997 | expand_string_forcedfail = FALSE; |
| 2998 | yield = new_yield; |
| 2999 | continue; |
| 3000 | } |
| 3001 | #endif /* EXIM_PERL */ |
| 3002 | |
| 3003 | /* Handle "readfile" to insert an entire file */ |
| 3004 | |
| 3005 | case EITEM_READFILE: |
| 3006 | { |
| 3007 | FILE *f; |
| 3008 | uschar *sub_arg[2]; |
| 3009 | |
| 3010 | if ((expand_forbid & RDO_READFILE) != 0) |
| 3011 | { |
| 3012 | expand_string_message = US"file insertions are not permitted"; |
| 3013 | goto EXPAND_FAILED; |
| 3014 | } |
| 3015 | |
| 3016 | switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile")) |
| 3017 | { |
| 3018 | case 1: goto EXPAND_FAILED_CURLY; |
| 3019 | case 2: |
| 3020 | case 3: goto EXPAND_FAILED; |
| 3021 | } |
| 3022 | |
| 3023 | /* If skipping, we don't actually do anything */ |
| 3024 | |
| 3025 | if (skipping) continue; |
| 3026 | |
| 3027 | /* Open the file and read it */ |
| 3028 | |
| 3029 | f = Ufopen(sub_arg[0], "rb"); |
| 3030 | if (f == NULL) |
| 3031 | { |
| 3032 | expand_string_message = string_open_failed(errno, "%s", sub_arg[0]); |
| 3033 | goto EXPAND_FAILED; |
| 3034 | } |
| 3035 | |
| 3036 | yield = cat_file(f, yield, &size, &ptr, sub_arg[1]); |
| 3037 | fclose(f); |
| 3038 | continue; |
| 3039 | } |
| 3040 | |
| 3041 | /* Handle "readsocket" to insert data from a Unix domain socket */ |
| 3042 | |
| 3043 | case EITEM_READSOCK: |
| 3044 | { |
| 3045 | int fd; |
| 3046 | int timeout = 5; |
| 3047 | int save_ptr = ptr; |
| 3048 | FILE *f; |
| 3049 | struct sockaddr_un sockun; /* don't call this "sun" ! */ |
| 3050 | uschar *arg; |
| 3051 | uschar *sub_arg[4]; |
| 3052 | |
| 3053 | if ((expand_forbid & RDO_READSOCK) != 0) |
| 3054 | { |
| 3055 | expand_string_message = US"socket insertions are not permitted"; |
| 3056 | goto EXPAND_FAILED; |
| 3057 | } |
| 3058 | |
| 3059 | /* Read up to 4 arguments, but don't do the end of item check afterwards, |
| 3060 | because there may be a string for expansion on failure. */ |
| 3061 | |
| 3062 | switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket")) |
| 3063 | { |
| 3064 | case 1: goto EXPAND_FAILED_CURLY; |
| 3065 | case 2: /* Won't occur: no end check */ |
| 3066 | case 3: goto EXPAND_FAILED; |
| 3067 | } |
| 3068 | |
| 3069 | /* Sort out timeout, if given */ |
| 3070 | |
| 3071 | if (sub_arg[2] != NULL) |
| 3072 | { |
| 3073 | timeout = readconf_readtime(sub_arg[2], 0, FALSE); |
| 3074 | if (timeout < 0) |
| 3075 | { |
| 3076 | expand_string_message = string_sprintf("bad time value %s", |
| 3077 | sub_arg[2]); |
| 3078 | goto EXPAND_FAILED; |
| 3079 | } |
| 3080 | } |
| 3081 | else sub_arg[3] = NULL; /* No eol if no timeout */ |
| 3082 | |
| 3083 | /* If skipping, we don't actually do anything */ |
| 3084 | |
| 3085 | if (!skipping) |
| 3086 | { |
| 3087 | /* Make a connection to the socket */ |
| 3088 | |
| 3089 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
| 3090 | { |
| 3091 | expand_string_message = string_sprintf("failed to create socket: %s", |
| 3092 | strerror(errno)); |
| 3093 | goto SOCK_FAIL; |
| 3094 | } |
| 3095 | |
| 3096 | sockun.sun_family = AF_UNIX; |
| 3097 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), |
| 3098 | sub_arg[0]); |
| 3099 | if(connect(fd, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1) |
| 3100 | { |
| 3101 | expand_string_message = string_sprintf("failed to connect to socket " |
| 3102 | "%s: %s", sub_arg[0], strerror(errno)); |
| 3103 | goto SOCK_FAIL; |
| 3104 | } |
| 3105 | DEBUG(D_expand) debug_printf("connected to socket %s\n", sub_arg[0]); |
| 3106 | |
| 3107 | /* Write the request string, if not empty */ |
| 3108 | |
| 3109 | if (sub_arg[1][0] != 0) |
| 3110 | { |
| 3111 | int len = Ustrlen(sub_arg[1]); |
| 3112 | DEBUG(D_expand) debug_printf("writing \"%s\" to socket\n", |
| 3113 | sub_arg[1]); |
| 3114 | if (write(fd, sub_arg[1], len) != len) |
| 3115 | { |
| 3116 | expand_string_message = string_sprintf("request write to socket " |
| 3117 | "failed: %s", strerror(errno)); |
| 3118 | goto SOCK_FAIL; |
| 3119 | } |
| 3120 | } |
| 3121 | |
| 3122 | /* Now we need to read from the socket, under a timeout. The function |
| 3123 | that reads a file can be used. */ |
| 3124 | |
| 3125 | f = fdopen(fd, "rb"); |
| 3126 | sigalrm_seen = FALSE; |
| 3127 | alarm(timeout); |
| 3128 | yield = cat_file(f, yield, &size, &ptr, sub_arg[3]); |
| 3129 | alarm(0); |
| 3130 | fclose(f); |
| 3131 | |
| 3132 | /* After a timeout, we restore the pointer in the result, that is, |
| 3133 | make sure we add nothing from the socket. */ |
| 3134 | |
| 3135 | if (sigalrm_seen) |
| 3136 | { |
| 3137 | ptr = save_ptr; |
| 3138 | expand_string_message = US"socket read timed out"; |
| 3139 | goto SOCK_FAIL; |
| 3140 | } |
| 3141 | } |
| 3142 | |
| 3143 | /* The whole thing has worked (or we were skipping). If there is a |
| 3144 | failure string following, we need to skip it. */ |
| 3145 | |
| 3146 | if (*s == '{') |
| 3147 | { |
| 3148 | if (expand_string_internal(s+1, TRUE, &s, TRUE) == NULL) |
| 3149 | goto EXPAND_FAILED; |
| 3150 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3151 | while (isspace(*s)) s++; |
| 3152 | } |
| 3153 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3154 | continue; |
| 3155 | |
| 3156 | /* Come here on failure to create socket, connect socket, write to the |
| 3157 | socket, or timeout on reading. If another substring follows, expand and |
| 3158 | use it. Otherwise, those conditions give expand errors. */ |
| 3159 | |
| 3160 | SOCK_FAIL: |
| 3161 | if (*s != '{') goto EXPAND_FAILED; |
| 3162 | DEBUG(D_any) debug_printf("%s\n", expand_string_message); |
| 3163 | arg = expand_string_internal(s+1, TRUE, &s, FALSE); |
| 3164 | if (arg == NULL) goto EXPAND_FAILED; |
| 3165 | yield = string_cat(yield, &size, &ptr, arg, Ustrlen(arg)); |
| 3166 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3167 | while (isspace(*s)) s++; |
| 3168 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3169 | continue; |
| 3170 | } |
| 3171 | |
| 3172 | /* Handle "run" to execute a program. */ |
| 3173 | |
| 3174 | case EITEM_RUN: |
| 3175 | { |
| 3176 | FILE *f; |
| 3177 | uschar *old_lookup_value = NULL; |
| 3178 | uschar *arg; |
| 3179 | uschar **argv; |
| 3180 | pid_t pid; |
| 3181 | int fd_in, fd_out; |
| 3182 | int lsize = 0; |
| 3183 | int lptr = 0; |
| 3184 | |
| 3185 | if ((expand_forbid & RDO_RUN) != 0) |
| 3186 | { |
| 3187 | expand_string_message = US"running a command is not permitted"; |
| 3188 | goto EXPAND_FAILED; |
| 3189 | } |
| 3190 | |
| 3191 | while (isspace(*s)) s++; |
| 3192 | if (*s != '{') goto EXPAND_FAILED_CURLY; |
| 3193 | arg = expand_string_internal(s+1, TRUE, &s, skipping); |
| 3194 | if (arg == NULL) goto EXPAND_FAILED; |
| 3195 | while (isspace(*s)) s++; |
| 3196 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3197 | |
| 3198 | if (skipping) /* Just pretend it worked when we're skipping */ |
| 3199 | { |
| 3200 | runrc = 0; |
| 3201 | } |
| 3202 | else |
| 3203 | { |
| 3204 | if (!transport_set_up_command(&argv, /* anchor for arg list */ |
| 3205 | arg, /* raw command */ |
| 3206 | FALSE, /* don't expand the arguments */ |
| 3207 | 0, /* not relevant when... */ |
| 3208 | NULL, /* no transporting address */ |
| 3209 | US"${run} expansion", /* for error messages */ |
| 3210 | &expand_string_message)) /* where to put error message */ |
| 3211 | { |
| 3212 | goto EXPAND_FAILED; |
| 3213 | } |
| 3214 | |
| 3215 | /* Create the child process, making it a group leader. */ |
| 3216 | |
| 3217 | pid = child_open(argv, NULL, 0077, &fd_in, &fd_out, TRUE); |
| 3218 | |
| 3219 | if (pid < 0) |
| 3220 | { |
| 3221 | expand_string_message = |
| 3222 | string_sprintf("couldn't create child process: %s", strerror(errno)); |
| 3223 | goto EXPAND_FAILED; |
| 3224 | } |
| 3225 | |
| 3226 | /* Nothing is written to the standard input. */ |
| 3227 | |
| 3228 | close(fd_in); |
| 3229 | |
| 3230 | /* Wait for the process to finish, applying the timeout, and inspect its |
| 3231 | return code for serious disasters. Simple non-zero returns are passed on. |
| 3232 | */ |
| 3233 | |
| 3234 | if ((runrc = child_close(pid, 60)) < 0) |
| 3235 | { |
| 3236 | if (runrc == -256) |
| 3237 | { |
| 3238 | expand_string_message = string_sprintf("command timed out"); |
| 3239 | killpg(pid, SIGKILL); /* Kill the whole process group */ |
| 3240 | } |
| 3241 | |
| 3242 | else if (runrc == -257) |
| 3243 | expand_string_message = string_sprintf("wait() failed: %s", |
| 3244 | strerror(errno)); |
| 3245 | |
| 3246 | else |
| 3247 | expand_string_message = string_sprintf("command killed by signal %d", |
| 3248 | -runrc); |
| 3249 | |
| 3250 | goto EXPAND_FAILED; |
| 3251 | } |
| 3252 | |
| 3253 | /* Read the pipe to get the command's output into $value (which is kept |
| 3254 | in lookup_value). */ |
| 3255 | |
| 3256 | f = fdopen(fd_out, "rb"); |
| 3257 | old_lookup_value = lookup_value; |
| 3258 | lookup_value = NULL; |
| 3259 | lookup_value = cat_file(f, lookup_value, &lsize, &lptr, NULL); |
| 3260 | fclose(f); |
| 3261 | } |
| 3262 | |
| 3263 | /* Process the yes/no strings */ |
| 3264 | |
| 3265 | switch(process_yesno( |
| 3266 | skipping, /* were previously skipping */ |
| 3267 | runrc == 0, /* success/failure indicator */ |
| 3268 | old_lookup_value, /* value to reset for string2 */ |
| 3269 | &s, /* input pointer */ |
| 3270 | &yield, /* output pointer */ |
| 3271 | &size, /* output size */ |
| 3272 | &ptr, /* output current point */ |
| 3273 | US"run")) /* condition type */ |
| 3274 | { |
| 3275 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 3276 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 3277 | } |
| 3278 | |
| 3279 | continue; |
| 3280 | } |
| 3281 | |
| 3282 | /* Handle character translation for "tr" */ |
| 3283 | |
| 3284 | case EITEM_TR: |
| 3285 | { |
| 3286 | int oldptr = ptr; |
| 3287 | int o2m; |
| 3288 | uschar *sub[3]; |
| 3289 | |
| 3290 | switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr")) |
| 3291 | { |
| 3292 | case 1: goto EXPAND_FAILED_CURLY; |
| 3293 | case 2: |
| 3294 | case 3: goto EXPAND_FAILED; |
| 3295 | } |
| 3296 | |
| 3297 | yield = string_cat(yield, &size, &ptr, sub[0], Ustrlen(sub[0])); |
| 3298 | o2m = Ustrlen(sub[2]) - 1; |
| 3299 | |
| 3300 | if (o2m >= 0) for (; oldptr < ptr; oldptr++) |
| 3301 | { |
| 3302 | uschar *m = Ustrrchr(sub[1], yield[oldptr]); |
| 3303 | if (m != NULL) |
| 3304 | { |
| 3305 | int o = m - sub[1]; |
| 3306 | yield[oldptr] = sub[2][(o < o2m)? o : o2m]; |
| 3307 | } |
| 3308 | } |
| 3309 | |
| 3310 | continue; |
| 3311 | } |
| 3312 | |
| 3313 | /* Handle "hash", "length", "nhash", and "substr" when they are given with |
| 3314 | expanded arguments. */ |
| 3315 | |
| 3316 | case EITEM_HASH: |
| 3317 | case EITEM_LENGTH: |
| 3318 | case EITEM_NHASH: |
| 3319 | case EITEM_SUBSTR: |
| 3320 | { |
| 3321 | int i; |
| 3322 | int len; |
| 3323 | uschar *ret; |
| 3324 | int val[2] = { 0, -1 }; |
| 3325 | uschar *sub[3]; |
| 3326 | |
| 3327 | /* "length" takes only 2 arguments whereas the others take 2 or 3. |
| 3328 | Ensure that sub[2] is set in the ${length case. */ |
| 3329 | |
| 3330 | sub[2] = NULL; |
| 3331 | switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping, |
| 3332 | TRUE, name)) |
| 3333 | { |
| 3334 | case 1: goto EXPAND_FAILED_CURLY; |
| 3335 | case 2: |
| 3336 | case 3: goto EXPAND_FAILED; |
| 3337 | } |
| 3338 | |
| 3339 | /* Juggle the arguments if there are only two of them: always move the |
| 3340 | string to the last position and make ${length{n}{str}} equivalent to |
| 3341 | ${substr{0}{n}{str}}. See the defaults for val[] above. */ |
| 3342 | |
| 3343 | if (sub[2] == NULL) |
| 3344 | { |
| 3345 | sub[2] = sub[1]; |
| 3346 | sub[1] = NULL; |
| 3347 | if (item_type == EITEM_LENGTH) |
| 3348 | { |
| 3349 | sub[1] = sub[0]; |
| 3350 | sub[0] = NULL; |
| 3351 | } |
| 3352 | } |
| 3353 | |
| 3354 | for (i = 0; i < 2; i++) |
| 3355 | { |
| 3356 | if (sub[i] == NULL) continue; |
| 3357 | val[i] = (int)Ustrtol(sub[i], &ret, 10); |
| 3358 | if (*ret != 0 || (i != 0 && val[i] < 0)) |
| 3359 | { |
| 3360 | expand_string_message = string_sprintf("\"%s\" is not a%s number " |
| 3361 | "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name); |
| 3362 | goto EXPAND_FAILED; |
| 3363 | } |
| 3364 | } |
| 3365 | |
| 3366 | ret = |
| 3367 | (item_type == EITEM_HASH)? |
| 3368 | compute_hash(sub[2], val[0], val[1], &len) : |
| 3369 | (item_type == EITEM_NHASH)? |
| 3370 | compute_nhash(sub[2], val[0], val[1], &len) : |
| 3371 | extract_substr(sub[2], val[0], val[1], &len); |
| 3372 | |
| 3373 | if (ret == NULL) goto EXPAND_FAILED; |
| 3374 | yield = string_cat(yield, &size, &ptr, ret, len); |
| 3375 | continue; |
| 3376 | } |
| 3377 | |
| 3378 | /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}} |
| 3379 | This code originally contributed by Steve Haslam. It currently supports |
| 3380 | the use of MD5 and SHA-1 hashes. |
| 3381 | |
| 3382 | We need some workspace that is large enough to handle all the supported |
| 3383 | hash types. Use macros to set the sizes rather than be too elaborate. */ |
| 3384 | |
| 3385 | #define MAX_HASHLEN 20 |
| 3386 | #define MAX_HASHBLOCKLEN 64 |
| 3387 | |
| 3388 | case EITEM_HMAC: |
| 3389 | { |
| 3390 | uschar *sub[3]; |
| 3391 | md5 md5_base; |
| 3392 | sha1 sha1_base; |
| 3393 | void *use_base; |
| 3394 | int type, i; |
| 3395 | int hashlen; /* Number of octets for the hash algorithm's output */ |
| 3396 | int hashblocklen; /* Number of octets the hash algorithm processes */ |
| 3397 | uschar *keyptr, *p; |
| 3398 | unsigned int keylen; |
| 3399 | |
| 3400 | uschar keyhash[MAX_HASHLEN]; |
| 3401 | uschar innerhash[MAX_HASHLEN]; |
| 3402 | uschar finalhash[MAX_HASHLEN]; |
| 3403 | uschar finalhash_hex[2*MAX_HASHLEN]; |
| 3404 | uschar innerkey[MAX_HASHBLOCKLEN]; |
| 3405 | uschar outerkey[MAX_HASHBLOCKLEN]; |
| 3406 | |
| 3407 | switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name)) |
| 3408 | { |
| 3409 | case 1: goto EXPAND_FAILED_CURLY; |
| 3410 | case 2: |
| 3411 | case 3: goto EXPAND_FAILED; |
| 3412 | } |
| 3413 | |
| 3414 | if (Ustrcmp(sub[0], "md5") == 0) |
| 3415 | { |
| 3416 | type = HMAC_MD5; |
| 3417 | use_base = &md5_base; |
| 3418 | hashlen = 16; |
| 3419 | hashblocklen = 64; |
| 3420 | } |
| 3421 | else if (Ustrcmp(sub[0], "sha1") == 0) |
| 3422 | { |
| 3423 | type = HMAC_SHA1; |
| 3424 | use_base = &sha1_base; |
| 3425 | hashlen = 20; |
| 3426 | hashblocklen = 64; |
| 3427 | } |
| 3428 | else |
| 3429 | { |
| 3430 | expand_string_message = |
| 3431 | string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]); |
| 3432 | goto EXPAND_FAILED; |
| 3433 | } |
| 3434 | |
| 3435 | keyptr = sub[1]; |
| 3436 | keylen = Ustrlen(keyptr); |
| 3437 | |
| 3438 | /* If the key is longer than the hash block length, then hash the key |
| 3439 | first */ |
| 3440 | |
| 3441 | if (keylen > hashblocklen) |
| 3442 | { |
| 3443 | chash_start(type, use_base); |
| 3444 | chash_end(type, use_base, keyptr, keylen, keyhash); |
| 3445 | keyptr = keyhash; |
| 3446 | keylen = hashlen; |
| 3447 | } |
| 3448 | |
| 3449 | /* Now make the inner and outer key values */ |
| 3450 | |
| 3451 | memset(innerkey, 0x36, hashblocklen); |
| 3452 | memset(outerkey, 0x5c, hashblocklen); |
| 3453 | |
| 3454 | for (i = 0; i < keylen; i++) |
| 3455 | { |
| 3456 | innerkey[i] ^= keyptr[i]; |
| 3457 | outerkey[i] ^= keyptr[i]; |
| 3458 | } |
| 3459 | |
| 3460 | /* Now do the hashes */ |
| 3461 | |
| 3462 | chash_start(type, use_base); |
| 3463 | chash_mid(type, use_base, innerkey); |
| 3464 | chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash); |
| 3465 | |
| 3466 | chash_start(type, use_base); |
| 3467 | chash_mid(type, use_base, outerkey); |
| 3468 | chash_end(type, use_base, innerhash, hashlen, finalhash); |
| 3469 | |
| 3470 | /* Encode the final hash as a hex string */ |
| 3471 | |
| 3472 | p = finalhash_hex; |
| 3473 | for (i = 0; i < hashlen; i++) |
| 3474 | { |
| 3475 | *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; |
| 3476 | *p++ = hex_digits[finalhash[i] & 0x0f]; |
| 3477 | } |
| 3478 | |
| 3479 | DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%.*s)=%.*s\n", sub[0], |
| 3480 | (int)keylen, keyptr, Ustrlen(sub[2]), sub[2], hashlen*2, finalhash_hex); |
| 3481 | |
| 3482 | yield = string_cat(yield, &size, &ptr, finalhash_hex, hashlen*2); |
| 3483 | } |
| 3484 | |
| 3485 | continue; |
| 3486 | |
| 3487 | /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator. |
| 3488 | We have to save the numerical variables and restore them afterwards. */ |
| 3489 | |
| 3490 | case EITEM_SG: |
| 3491 | { |
| 3492 | const pcre *re; |
| 3493 | int moffset, moffsetextra, slen; |
| 3494 | int roffset; |
| 3495 | int emptyopt; |
| 3496 | const uschar *rerror; |
| 3497 | uschar *subject; |
| 3498 | uschar *sub[3]; |
| 3499 | int save_expand_nmax = |
| 3500 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 3501 | |
| 3502 | switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"sg")) |
| 3503 | { |
| 3504 | case 1: goto EXPAND_FAILED_CURLY; |
| 3505 | case 2: |
| 3506 | case 3: goto EXPAND_FAILED; |
| 3507 | } |
| 3508 | |
| 3509 | /* Compile the regular expression */ |
| 3510 | |
| 3511 | re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset, |
| 3512 | NULL); |
| 3513 | |
| 3514 | if (re == NULL) |
| 3515 | { |
| 3516 | expand_string_message = string_sprintf("regular expression error in " |
| 3517 | "\"%s\": %s at offset %d", sub[1], rerror, roffset); |
| 3518 | goto EXPAND_FAILED; |
| 3519 | } |
| 3520 | |
| 3521 | /* Now run a loop to do the substitutions as often as necessary. It ends |
| 3522 | when there are no more matches. Take care over matches of the null string; |
| 3523 | do the same thing as Perl does. */ |
| 3524 | |
| 3525 | subject = sub[0]; |
| 3526 | slen = Ustrlen(sub[0]); |
| 3527 | moffset = moffsetextra = 0; |
| 3528 | emptyopt = 0; |
| 3529 | |
| 3530 | for (;;) |
| 3531 | { |
| 3532 | int ovector[3*(EXPAND_MAXN+1)]; |
| 3533 | int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra, |
| 3534 | PCRE_EOPT | emptyopt, ovector, sizeof(ovector)/sizeof(int)); |
| 3535 | int nn; |
| 3536 | uschar *insert; |
| 3537 | |
| 3538 | /* No match - if we previously set PCRE_NOTEMPTY after a null match, this |
| 3539 | is not necessarily the end. We want to repeat the match from one |
| 3540 | character further along, but leaving the basic offset the same (for |
| 3541 | copying below). We can't be at the end of the string - that was checked |
| 3542 | before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are |
| 3543 | finished; copy the remaining string and end the loop. */ |
| 3544 | |
| 3545 | if (n < 0) |
| 3546 | { |
| 3547 | if (emptyopt != 0) |
| 3548 | { |
| 3549 | moffsetextra = 1; |
| 3550 | emptyopt = 0; |
| 3551 | continue; |
| 3552 | } |
| 3553 | yield = string_cat(yield, &size, &ptr, subject+moffset, slen-moffset); |
| 3554 | break; |
| 3555 | } |
| 3556 | |
| 3557 | /* Match - set up for expanding the replacement. */ |
| 3558 | |
| 3559 | if (n == 0) n = EXPAND_MAXN + 1; |
| 3560 | expand_nmax = 0; |
| 3561 | for (nn = 0; nn < n*2; nn += 2) |
| 3562 | { |
| 3563 | expand_nstring[expand_nmax] = subject + ovector[nn]; |
| 3564 | expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; |
| 3565 | } |
| 3566 | expand_nmax--; |
| 3567 | |
| 3568 | /* Copy the characters before the match, plus the expanded insertion. */ |
| 3569 | |
| 3570 | yield = string_cat(yield, &size, &ptr, subject + moffset, |
| 3571 | ovector[0] - moffset); |
| 3572 | insert = expand_string(sub[2]); |
| 3573 | if (insert == NULL) goto EXPAND_FAILED; |
| 3574 | yield = string_cat(yield, &size, &ptr, insert, Ustrlen(insert)); |
| 3575 | |
| 3576 | moffset = ovector[1]; |
| 3577 | moffsetextra = 0; |
| 3578 | emptyopt = 0; |
| 3579 | |
| 3580 | /* If we have matched an empty string, first check to see if we are at |
| 3581 | the end of the subject. If so, the loop is over. Otherwise, mimic |
| 3582 | what Perl's /g options does. This turns out to be rather cunning. First |
| 3583 | we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty |
| 3584 | string at the same point. If this fails (picked up above) we advance to |
| 3585 | the next character. */ |
| 3586 | |
| 3587 | if (ovector[0] == ovector[1]) |
| 3588 | { |
| 3589 | if (ovector[0] == slen) break; |
| 3590 | emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED; |
| 3591 | } |
| 3592 | } |
| 3593 | |
| 3594 | /* All done - restore numerical variables. */ |
| 3595 | |
| 3596 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 3597 | save_expand_nlength); |
| 3598 | continue; |
| 3599 | } |
| 3600 | |
| 3601 | /* Handle keyed and numbered substring extraction. If the first argument |
| 3602 | consists entirely of digits, then a numerical extraction is assumed. */ |
| 3603 | |
| 3604 | case EITEM_EXTRACT: |
| 3605 | { |
| 3606 | int i; |
| 3607 | int j = 2; |
| 3608 | int field_number = 1; |
| 3609 | BOOL field_number_set = FALSE; |
| 3610 | uschar *save_lookup_value = lookup_value; |
| 3611 | uschar *sub[3]; |
| 3612 | int save_expand_nmax = |
| 3613 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 3614 | |
| 3615 | /* Read the arguments */ |
| 3616 | |
| 3617 | for (i = 0; i < j; i++) |
| 3618 | { |
| 3619 | while (isspace(*s)) s++; |
| 3620 | if (*s == '{') |
| 3621 | { |
| 3622 | sub[i] = expand_string_internal(s+1, TRUE, &s, skipping); |
| 3623 | if (sub[i] == NULL) goto EXPAND_FAILED; |
| 3624 | if (*s++ != '}') goto EXPAND_FAILED_CURLY; |
| 3625 | |
| 3626 | /* After removal of leading and trailing white space, the first |
| 3627 | argument must not be empty; if it consists entirely of digits |
| 3628 | (optionally preceded by a minus sign), this is a numerical |
| 3629 | extraction, and we expect 3 arguments. */ |
| 3630 | |
| 3631 | if (i == 0) |
| 3632 | { |
| 3633 | int len; |
| 3634 | int x = 0; |
| 3635 | uschar *p = sub[0]; |
| 3636 | |
| 3637 | while (isspace(*p)) p++; |
| 3638 | sub[0] = p; |
| 3639 | |
| 3640 | len = Ustrlen(p); |
| 3641 | while (len > 0 && isspace(p[len-1])) len--; |
| 3642 | p[len] = 0; |
| 3643 | |
| 3644 | if (*p == 0) |
| 3645 | { |
| 3646 | expand_string_message = US"first argument of \"expand\" must not " |
| 3647 | "be empty"; |
| 3648 | goto EXPAND_FAILED; |
| 3649 | } |
| 3650 | |
| 3651 | if (*p == '-') |
| 3652 | { |
| 3653 | field_number = -1; |
| 3654 | p++; |
| 3655 | } |
| 3656 | while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0'; |
| 3657 | if (*p == 0) |
| 3658 | { |
| 3659 | field_number *= x; |
| 3660 | j = 3; /* Need 3 args */ |
| 3661 | field_number_set = TRUE; |
| 3662 | } |
| 3663 | } |
| 3664 | } |
| 3665 | else goto EXPAND_FAILED_CURLY; |
| 3666 | } |
| 3667 | |
| 3668 | /* Extract either the numbered or the keyed substring into $value. If |
| 3669 | skipping, just pretend the extraction failed. */ |
| 3670 | |
| 3671 | lookup_value = skipping? NULL : field_number_set? |
| 3672 | expand_gettokened(field_number, sub[1], sub[2]) : |
| 3673 | expand_getkeyed(sub[0], sub[1]); |
| 3674 | |
| 3675 | /* If no string follows, $value gets substituted; otherwise there can |
| 3676 | be yes/no strings, as for lookup or if. */ |
| 3677 | |
| 3678 | switch(process_yesno( |
| 3679 | skipping, /* were previously skipping */ |
| 3680 | lookup_value != NULL, /* success/failure indicator */ |
| 3681 | save_lookup_value, /* value to reset for string2 */ |
| 3682 | &s, /* input pointer */ |
| 3683 | &yield, /* output pointer */ |
| 3684 | &size, /* output size */ |
| 3685 | &ptr, /* output current point */ |
| 3686 | US"extract")) /* condition type */ |
| 3687 | { |
| 3688 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 3689 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 3690 | } |
| 3691 | |
| 3692 | /* All done - restore numerical variables. */ |
| 3693 | |
| 3694 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 3695 | save_expand_nlength); |
| 3696 | |
| 3697 | continue; |
| 3698 | } |
| 3699 | } |
| 3700 | |
| 3701 | /* Control reaches here if the name is not recognized as one of the more |
| 3702 | complicated expansion items. Check for the "operator" syntax (name terminated |
| 3703 | by a colon). Some of the operators have arguments, separated by _ from the |
| 3704 | name. */ |
| 3705 | |
| 3706 | if (*s == ':') |
| 3707 | { |
| 3708 | int c; |
| 3709 | uschar *arg = NULL; |
| 3710 | uschar *sub = expand_string_internal(s+1, TRUE, &s, skipping); |
| 3711 | if (sub == NULL) goto EXPAND_FAILED; |
| 3712 | s++; |
| 3713 | |
| 3714 | /* Owing to an historical mis-design, an underscore may be part of the |
| 3715 | operator name, or it may introduce arguments. We therefore first scan the |
| 3716 | table of names that contain underscores. If there is no match, we cut off |
| 3717 | the arguments and then scan the main table. */ |
| 3718 | |
| 3719 | c = chop_match(name, op_table_underscore, |
| 3720 | sizeof(op_table_underscore)/sizeof(uschar *)); |
| 3721 | |
| 3722 | if (c < 0) |
| 3723 | { |
| 3724 | arg = Ustrchr(name, '_'); |
| 3725 | if (arg != NULL) *arg = 0; |
| 3726 | c = chop_match(name, op_table_main, |
| 3727 | sizeof(op_table_main)/sizeof(uschar *)); |
| 3728 | if (c >= 0) c += sizeof(op_table_underscore)/sizeof(uschar *); |
| 3729 | if (arg != NULL) *arg++ = '_'; /* Put back for error messages */ |
| 3730 | } |
| 3731 | |
| 3732 | /* If we are skipping, we don't need to perform the operation at all. |
| 3733 | This matters for operations like "mask", because the data may not be |
| 3734 | in the correct format when skipping. For example, the expression may test |
| 3735 | for the existence of $sender_host_address before trying to mask it. For |
| 3736 | other operations, doing them may not fail, but it is a waste of time. */ |
| 3737 | |
| 3738 | if (skipping && c >= 0) continue; |
| 3739 | |
| 3740 | /* Otherwise, switch on the operator type */ |
| 3741 | |
| 3742 | switch(c) |
| 3743 | { |
| 3744 | case EOP_BASE62: |
| 3745 | { |
| 3746 | uschar *t; |
| 3747 | unsigned long int n = Ustrtoul(sub, &t, 10); |
| 3748 | if (*t != 0) |
| 3749 | { |
| 3750 | expand_string_message = string_sprintf("argument for base62 " |
| 3751 | "operator is \"%s\", which is not a decimal number", sub); |
| 3752 | goto EXPAND_FAILED; |
| 3753 | } |
| 3754 | t = string_base62(n); |
| 3755 | yield = string_cat(yield, &size, &ptr, t, Ustrlen(t)); |
| 3756 | continue; |
| 3757 | } |
| 3758 | |
| 3759 | case EOP_BASE62D: |
| 3760 | { |
| 3761 | uschar buf[16]; |
| 3762 | uschar *tt = sub; |
| 3763 | unsigned long int n = 0; |
| 3764 | while (*tt != 0) |
| 3765 | { |
| 3766 | uschar *t = Ustrchr(base62_chars, *tt++); |
| 3767 | if (t == NULL) |
| 3768 | { |
| 3769 | expand_string_message = string_sprintf("argument for base62d " |
| 3770 | "operator is \"%s\", which is not a base 62 number", sub); |
| 3771 | goto EXPAND_FAILED; |
| 3772 | } |
| 3773 | n = n * 62 + (t - base62_chars); |
| 3774 | } |
| 3775 | (void)sprintf(CS buf, "%ld", n); |
| 3776 | yield = string_cat(yield, &size, &ptr, buf, Ustrlen(buf)); |
| 3777 | continue; |
| 3778 | } |
| 3779 | |
| 3780 | case EOP_EXPAND: |
| 3781 | { |
| 3782 | uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping); |
| 3783 | if (expanded == NULL) |
| 3784 | { |
| 3785 | expand_string_message = |
| 3786 | string_sprintf("internal expansion of \"%s\" failed: %s", sub, |
| 3787 | expand_string_message); |
| 3788 | goto EXPAND_FAILED; |
| 3789 | } |
| 3790 | yield = string_cat(yield, &size, &ptr, expanded, Ustrlen(expanded)); |
| 3791 | continue; |
| 3792 | } |
| 3793 | |
| 3794 | case EOP_LC: |
| 3795 | { |
| 3796 | int count = 0; |
| 3797 | uschar *t = sub - 1; |
| 3798 | while (*(++t) != 0) { *t = tolower(*t); count++; } |
| 3799 | yield = string_cat(yield, &size, &ptr, sub, count); |
| 3800 | continue; |
| 3801 | } |
| 3802 | |
| 3803 | case EOP_UC: |
| 3804 | { |
| 3805 | int count = 0; |
| 3806 | uschar *t = sub - 1; |
| 3807 | while (*(++t) != 0) { *t = toupper(*t); count++; } |
| 3808 | yield = string_cat(yield, &size, &ptr, sub, count); |
| 3809 | continue; |
| 3810 | } |
| 3811 | |
| 3812 | case EOP_MD5: |
| 3813 | { |
| 3814 | md5 base; |
| 3815 | uschar digest[16]; |
| 3816 | int j; |
| 3817 | char st[33]; |
| 3818 | md5_start(&base); |
| 3819 | md5_end(&base, sub, Ustrlen(sub), digest); |
| 3820 | for(j = 0; j < 16; j++) sprintf(st+2*j, "%02x", digest[j]); |
| 3821 | yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st)); |
| 3822 | continue; |
| 3823 | } |
| 3824 | |
| 3825 | case EOP_SHA1: |
| 3826 | { |
| 3827 | sha1 base; |
| 3828 | uschar digest[20]; |
| 3829 | int j; |
| 3830 | char st[41]; |
| 3831 | sha1_start(&base); |
| 3832 | sha1_end(&base, sub, Ustrlen(sub), digest); |
| 3833 | for(j = 0; j < 20; j++) sprintf(st+2*j, "%02X", digest[j]); |
| 3834 | yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st)); |
| 3835 | continue; |
| 3836 | } |
| 3837 | |
| 3838 | /* Convert hex encoding to base64 encoding */ |
| 3839 | |
| 3840 | case EOP_HEX2B64: |
| 3841 | { |
| 3842 | int c = 0; |
| 3843 | int b = -1; |
| 3844 | uschar *in = sub; |
| 3845 | uschar *out = sub; |
| 3846 | uschar *enc; |
| 3847 | |
| 3848 | for (enc = sub; *enc != 0; enc++) |
| 3849 | { |
| 3850 | if (!isxdigit(*enc)) |
| 3851 | { |
| 3852 | expand_string_message = string_sprintf("\"%s\" is not a hex " |
| 3853 | "string", sub); |
| 3854 | goto EXPAND_FAILED; |
| 3855 | } |
| 3856 | c++; |
| 3857 | } |
| 3858 | |
| 3859 | if ((c & 1) != 0) |
| 3860 | { |
| 3861 | expand_string_message = string_sprintf("\"%s\" contains an odd " |
| 3862 | "number of characters", sub); |
| 3863 | goto EXPAND_FAILED; |
| 3864 | } |
| 3865 | |
| 3866 | while ((c = *in++) != 0) |
| 3867 | { |
| 3868 | if (isdigit(c)) c -= '0'; |
| 3869 | else c = toupper(c) - 'A' + 10; |
| 3870 | if (b == -1) |
| 3871 | { |
| 3872 | b = c << 4; |
| 3873 | } |
| 3874 | else |
| 3875 | { |
| 3876 | *out++ = b | c; |
| 3877 | b = -1; |
| 3878 | } |
| 3879 | } |
| 3880 | |
| 3881 | enc = auth_b64encode(sub, out - sub); |
| 3882 | yield = string_cat(yield, &size, &ptr, enc, Ustrlen(enc)); |
| 3883 | continue; |
| 3884 | } |
| 3885 | |
| 3886 | /* mask applies a mask to an IP address; for example the result of |
| 3887 | ${mask:131.111.10.206/28} is 131.111.10.192/28. */ |
| 3888 | |
| 3889 | case EOP_MASK: |
| 3890 | { |
| 3891 | int count; |
| 3892 | uschar *endptr; |
| 3893 | int binary[4]; |
| 3894 | int mask, maskoffset; |
| 3895 | int type = string_is_ip_address(sub, &maskoffset); |
| 3896 | uschar buffer[64]; |
| 3897 | |
| 3898 | if (type == 0) |
| 3899 | { |
| 3900 | expand_string_message = string_sprintf("\"%s\" is not an IP address", |
| 3901 | sub); |
| 3902 | goto EXPAND_FAILED; |
| 3903 | } |
| 3904 | |
| 3905 | if (maskoffset == 0) |
| 3906 | { |
| 3907 | expand_string_message = string_sprintf("missing mask value in \"%s\"", |
| 3908 | sub); |
| 3909 | goto EXPAND_FAILED; |
| 3910 | } |
| 3911 | |
| 3912 | mask = Ustrtol(sub + maskoffset + 1, &endptr, 10); |
| 3913 | |
| 3914 | if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128)) |
| 3915 | { |
| 3916 | expand_string_message = string_sprintf("mask value too big in \"%s\"", |
| 3917 | sub); |
| 3918 | goto EXPAND_FAILED; |
| 3919 | } |
| 3920 | |
| 3921 | /* Convert the address to binary integer(s) and apply the mask */ |
| 3922 | |
| 3923 | sub[maskoffset] = 0; |
| 3924 | count = host_aton(sub, binary); |
| 3925 | host_mask(count, binary, mask); |
| 3926 | |
| 3927 | /* Convert to masked textual format and add to output. */ |
| 3928 | |
| 3929 | yield = string_cat(yield, &size, &ptr, buffer, |
| 3930 | host_nmtoa(count, binary, mask, buffer)); |
| 3931 | continue; |
| 3932 | } |
| 3933 | |
| 3934 | case EOP_ADDRESS: |
| 3935 | case EOP_LOCAL_PART: |
| 3936 | case EOP_DOMAIN: |
| 3937 | { |
| 3938 | uschar *error; |
| 3939 | int start, end, domain; |
| 3940 | uschar *t = parse_extract_address(sub, &error, &start, &end, &domain, |
| 3941 | FALSE); |
| 3942 | if (t != NULL) |
| 3943 | { |
| 3944 | if (c != EOP_DOMAIN) |
| 3945 | { |
| 3946 | if (c == EOP_LOCAL_PART && domain != 0) end = start + domain - 1; |
| 3947 | yield = string_cat(yield, &size, &ptr, sub+start, end-start); |
| 3948 | } |
| 3949 | else if (domain != 0) |
| 3950 | { |
| 3951 | domain += start; |
| 3952 | yield = string_cat(yield, &size, &ptr, sub+domain, end-domain); |
| 3953 | } |
| 3954 | } |
| 3955 | continue; |
| 3956 | } |
| 3957 | |
| 3958 | /* quote puts a string in quotes if it is empty or contains anything |
| 3959 | other than alphamerics, underscore, dot, or hyphen. |
| 3960 | |
| 3961 | quote_local_part puts a string in quotes if RFC 2821/2822 requires it to |
| 3962 | be quoted in order to be a valid local part. |
| 3963 | |
| 3964 | In both cases, newlines and carriage returns are converted into \n and \r |
| 3965 | respectively */ |
| 3966 | |
| 3967 | case EOP_QUOTE: |
| 3968 | case EOP_QUOTE_LOCAL_PART: |
| 3969 | if (arg == NULL) |
| 3970 | { |
| 3971 | BOOL needs_quote = (*sub == 0); /* TRUE for empty string */ |
| 3972 | uschar *t = sub - 1; |
| 3973 | |
| 3974 | if (c == EOP_QUOTE) |
| 3975 | { |
| 3976 | while (!needs_quote && *(++t) != 0) |
| 3977 | needs_quote = !isalnum(*t) && !strchr("_-.", *t); |
| 3978 | } |
| 3979 | else /* EOP_QUOTE_LOCAL_PART */ |
| 3980 | { |
| 3981 | while (!needs_quote && *(++t) != 0) |
| 3982 | needs_quote = !isalnum(*t) && |
| 3983 | strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL && |
| 3984 | (*t != '.' || t == sub || t[1] == 0); |
| 3985 | } |
| 3986 | |
| 3987 | if (needs_quote) |
| 3988 | { |
| 3989 | yield = string_cat(yield, &size, &ptr, US"\"", 1); |
| 3990 | t = sub - 1; |
| 3991 | while (*(++t) != 0) |
| 3992 | { |
| 3993 | if (*t == '\n') |
| 3994 | yield = string_cat(yield, &size, &ptr, US"\\n", 2); |
| 3995 | else if (*t == '\r') |
| 3996 | yield = string_cat(yield, &size, &ptr, US"\\r", 2); |
| 3997 | else |
| 3998 | { |
| 3999 | if (*t == '\\' || *t == '"') |
| 4000 | yield = string_cat(yield, &size, &ptr, US"\\", 1); |
| 4001 | yield = string_cat(yield, &size, &ptr, t, 1); |
| 4002 | } |
| 4003 | } |
| 4004 | yield = string_cat(yield, &size, &ptr, US"\"", 1); |
| 4005 | } |
| 4006 | else yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub)); |
| 4007 | continue; |
| 4008 | } |
| 4009 | |
| 4010 | /* quote_lookuptype does lookup-specific quoting */ |
| 4011 | |
| 4012 | else |
| 4013 | { |
| 4014 | int n; |
| 4015 | uschar *opt = Ustrchr(arg, '_'); |
| 4016 | |
| 4017 | if (opt != NULL) *opt++ = 0; |
| 4018 | |
| 4019 | n = search_findtype(arg, Ustrlen(arg)); |
| 4020 | if (n < 0) |
| 4021 | { |
| 4022 | expand_string_message = search_error_message; |
| 4023 | goto EXPAND_FAILED; |
| 4024 | } |
| 4025 | |
| 4026 | if (lookup_list[n].quote != NULL) |
| 4027 | sub = (lookup_list[n].quote)(sub, opt); |
| 4028 | else if (opt != NULL) sub = NULL; |
| 4029 | |
| 4030 | if (sub == NULL) |
| 4031 | { |
| 4032 | expand_string_message = string_sprintf( |
| 4033 | "\"%s\" unrecognized after \"${quote_%s\"", |
| 4034 | opt, arg); |
| 4035 | goto EXPAND_FAILED; |
| 4036 | } |
| 4037 | |
| 4038 | yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub)); |
| 4039 | continue; |
| 4040 | } |
| 4041 | |
| 4042 | /* rx quote sticks in \ before any non-alphameric character so that |
| 4043 | the insertion works in a regular expression. */ |
| 4044 | |
| 4045 | case EOP_RXQUOTE: |
| 4046 | { |
| 4047 | uschar *t = sub - 1; |
| 4048 | while (*(++t) != 0) |
| 4049 | { |
| 4050 | if (!isalnum(*t)) |
| 4051 | yield = string_cat(yield, &size, &ptr, US"\\", 1); |
| 4052 | yield = string_cat(yield, &size, &ptr, t, 1); |
| 4053 | } |
| 4054 | continue; |
| 4055 | } |
| 4056 | |
| 4057 | /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as |
| 4058 | prescribed by the RFC, if there are characters that need to be encoded */ |
| 4059 | |
| 4060 | case EOP_RFC2047: |
| 4061 | { |
| 4062 | uschar buffer[1024]; |
| 4063 | uschar *string = parse_quote_2047(sub, Ustrlen(sub), headers_charset, |
| 4064 | buffer, sizeof(buffer)); |
| 4065 | yield = string_cat(yield, &size, &ptr, string, Ustrlen(string)); |
| 4066 | continue; |
| 4067 | } |
| 4068 | |
| 4069 | /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into |
| 4070 | underscores */ |
| 4071 | |
| 4072 | case EOP_FROM_UTF8: |
| 4073 | { |
| 4074 | while (*sub != 0) |
| 4075 | { |
| 4076 | int c; |
| 4077 | uschar buff[4]; |
| 4078 | GETUTF8INC(c, sub); |
| 4079 | if (c > 255) c = '_'; |
| 4080 | buff[0] = c; |
| 4081 | yield = string_cat(yield, &size, &ptr, buff, 1); |
| 4082 | } |
| 4083 | continue; |
| 4084 | } |
| 4085 | |
| 4086 | /* escape turns all non-printing characters into escape sequences. */ |
| 4087 | |
| 4088 | case EOP_ESCAPE: |
| 4089 | { |
| 4090 | uschar *t = string_printing(sub); |
| 4091 | yield = string_cat(yield, &size, &ptr, t, Ustrlen(t)); |
| 4092 | continue; |
| 4093 | } |
| 4094 | |
| 4095 | /* Handle numeric expression evaluation */ |
| 4096 | |
| 4097 | case EOP_EVAL: |
| 4098 | case EOP_EVAL10: |
| 4099 | { |
| 4100 | uschar *save_sub = sub; |
| 4101 | uschar *error = NULL; |
| 4102 | int n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE); |
| 4103 | if (error != NULL) |
| 4104 | { |
| 4105 | expand_string_message = string_sprintf("error in expression " |
| 4106 | "evaluation: %s (after processing \"%.*s\")", error, sub-save_sub, |
| 4107 | save_sub); |
| 4108 | goto EXPAND_FAILED; |
| 4109 | } |
| 4110 | sprintf(CS var_buffer, "%d", n); |
| 4111 | yield = string_cat(yield, &size, &ptr, var_buffer, Ustrlen(var_buffer)); |
| 4112 | continue; |
| 4113 | } |
| 4114 | |
| 4115 | /* Handle time period formating */ |
| 4116 | |
| 4117 | case EOP_TIME_INTERVAL: |
| 4118 | { |
| 4119 | int n; |
| 4120 | uschar *t = read_number(&n, sub); |
| 4121 | if (*t != 0) /* Not A Number*/ |
| 4122 | { |
| 4123 | expand_string_message = string_sprintf("string \"%s\" is not a " |
| 4124 | "positive number in \"%s\" operator", sub, name); |
| 4125 | goto EXPAND_FAILED; |
| 4126 | } |
| 4127 | t = readconf_printtime(n); |
| 4128 | yield = string_cat(yield, &size, &ptr, t, Ustrlen(t)); |
| 4129 | continue; |
| 4130 | } |
| 4131 | |
| 4132 | /* Convert string to base64 encoding */ |
| 4133 | |
| 4134 | case EOP_STR2B64: |
| 4135 | { |
| 4136 | uschar *encstr = auth_b64encode(sub, Ustrlen(sub)); |
| 4137 | yield = string_cat(yield, &size, &ptr, encstr, Ustrlen(encstr)); |
| 4138 | continue; |
| 4139 | } |
| 4140 | |
| 4141 | /* strlen returns the length of the string */ |
| 4142 | |
| 4143 | case EOP_STRLEN: |
| 4144 | { |
| 4145 | uschar buff[24]; |
| 4146 | (void)sprintf(CS buff, "%d", Ustrlen(sub)); |
| 4147 | yield = string_cat(yield, &size, &ptr, buff, Ustrlen(buff)); |
| 4148 | continue; |
| 4149 | } |
| 4150 | |
| 4151 | /* length_n or l_n takes just the first n characters or the whole string, |
| 4152 | whichever is the shorter; |
| 4153 | |
| 4154 | substr_m_n, and s_m_n take n characters from offset m; negative m take |
| 4155 | from the end; l_n is synonymous with s_0_n. If n is omitted in substr it |
| 4156 | takes the rest, either to the right or to the left. |
| 4157 | |
| 4158 | hash_n or h_n makes a hash of length n from the string, yielding n |
| 4159 | characters from the set a-z; hash_n_m makes a hash of length n, but |
| 4160 | uses m characters from the set a-zA-Z0-9. |
| 4161 | |
| 4162 | nhash_n returns a single number between 0 and n-1 (in text form), while |
| 4163 | nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies |
| 4164 | between 0 and n-1 and the second between 0 and m-1. */ |
| 4165 | |
| 4166 | case EOP_LENGTH: |
| 4167 | case EOP_L: |
| 4168 | case EOP_SUBSTR: |
| 4169 | case EOP_S: |
| 4170 | case EOP_HASH: |
| 4171 | case EOP_H: |
| 4172 | case EOP_NHASH: |
| 4173 | case EOP_NH: |
| 4174 | { |
| 4175 | int sign = 1; |
| 4176 | int value1 = 0; |
| 4177 | int value2 = -1; |
| 4178 | int *pn; |
| 4179 | int len; |
| 4180 | uschar *ret; |
| 4181 | |
| 4182 | if (arg == NULL) |
| 4183 | { |
| 4184 | expand_string_message = string_sprintf("missing values after %s", |
| 4185 | name); |
| 4186 | goto EXPAND_FAILED; |
| 4187 | } |
| 4188 | |
| 4189 | /* "length" has only one argument, effectively being synonymous with |
| 4190 | substr_0_n. */ |
| 4191 | |
| 4192 | if (c == EOP_LENGTH || c == EOP_L) |
| 4193 | { |
| 4194 | pn = &value2; |
| 4195 | value2 = 0; |
| 4196 | } |
| 4197 | |
| 4198 | /* The others have one or two arguments; for "substr" the first may be |
| 4199 | negative. The second being negative means "not supplied". */ |
| 4200 | |
| 4201 | else |
| 4202 | { |
| 4203 | pn = &value1; |
| 4204 | if (name[0] == 's' && *arg == '-') { sign = -1; arg++; } |
| 4205 | } |
| 4206 | |
| 4207 | /* Read up to two numbers, separated by underscores */ |
| 4208 | |
| 4209 | ret = arg; |
| 4210 | while (*arg != 0) |
| 4211 | { |
| 4212 | if (arg != ret && *arg == '_' && pn == &value1) |
| 4213 | { |
| 4214 | pn = &value2; |
| 4215 | value2 = 0; |
| 4216 | if (arg[1] != 0) arg++; |
| 4217 | } |
| 4218 | else if (!isdigit(*arg)) |
| 4219 | { |
| 4220 | expand_string_message = |
| 4221 | string_sprintf("non-digit after underscore in \"%s\"", name); |
| 4222 | goto EXPAND_FAILED; |
| 4223 | } |
| 4224 | else *pn = (*pn)*10 + *arg++ - '0'; |
| 4225 | } |
| 4226 | value1 *= sign; |
| 4227 | |
| 4228 | /* Perform the required operation */ |
| 4229 | |
| 4230 | ret = |
| 4231 | (c == EOP_HASH || c == EOP_H)? |
| 4232 | compute_hash(sub, value1, value2, &len) : |
| 4233 | (c == EOP_NHASH || c == EOP_NH)? |
| 4234 | compute_nhash(sub, value1, value2, &len) : |
| 4235 | extract_substr(sub, value1, value2, &len); |
| 4236 | |
| 4237 | if (ret == NULL) goto EXPAND_FAILED; |
| 4238 | yield = string_cat(yield, &size, &ptr, ret, len); |
| 4239 | continue; |
| 4240 | } |
| 4241 | |
| 4242 | /* Stat a path */ |
| 4243 | |
| 4244 | case EOP_STAT: |
| 4245 | { |
| 4246 | uschar *s; |
| 4247 | uschar smode[12]; |
| 4248 | uschar **modetable[3]; |
| 4249 | int i; |
| 4250 | mode_t mode; |
| 4251 | struct stat st; |
| 4252 | |
| 4253 | if (stat(CS sub, &st) < 0) |
| 4254 | { |
| 4255 | expand_string_message = string_sprintf("stat(%s) failed: %s", |
| 4256 | sub, strerror(errno)); |
| 4257 | goto EXPAND_FAILED; |
| 4258 | } |
| 4259 | mode = st.st_mode; |
| 4260 | switch (mode & S_IFMT) |
| 4261 | { |
| 4262 | case S_IFIFO: smode[0] = 'p'; break; |
| 4263 | case S_IFCHR: smode[0] = 'c'; break; |
| 4264 | case S_IFDIR: smode[0] = 'd'; break; |
| 4265 | case S_IFBLK: smode[0] = 'b'; break; |
| 4266 | case S_IFREG: smode[0] = '-'; break; |
| 4267 | default: smode[0] = '?'; break; |
| 4268 | } |
| 4269 | |
| 4270 | modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky; |
| 4271 | modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid; |
| 4272 | modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid; |
| 4273 | |
| 4274 | for (i = 0; i < 3; i++) |
| 4275 | { |
| 4276 | memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3); |
| 4277 | mode >>= 3; |
| 4278 | } |
| 4279 | |
| 4280 | smode[10] = 0; |
| 4281 | s = string_sprintf("mode=%04lo smode=%s inode=%ld device=%ld links=%ld " |
| 4282 | "uid=%ld gid=%ld size=%ld atime=%ld mtime=%ld ctime=%ld", |
| 4283 | (long)(st.st_mode & 077777), smode, (long)st.st_ino, |
| 4284 | (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid, |
| 4285 | (long)st.st_gid, (long)st.st_size, (long)st.st_atime, |
| 4286 | (long)st.st_mtime, (long)st.st_ctime); |
| 4287 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); |
| 4288 | continue; |
| 4289 | } |
| 4290 | |
| 4291 | /* Unknown operator */ |
| 4292 | |
| 4293 | default: |
| 4294 | expand_string_message = |
| 4295 | string_sprintf("unknown expansion operator \"%s\"", name); |
| 4296 | goto EXPAND_FAILED; |
| 4297 | } |
| 4298 | } |
| 4299 | |
| 4300 | /* Handle a plain name. If this is the first thing in the expansion, release |
| 4301 | the pre-allocated buffer. If the result data is known to be in a new buffer, |
| 4302 | newsize will be set to the size of that buffer, and we can just point at that |
| 4303 | store instead of copying. Many expansion strings contain just one reference, |
| 4304 | so this is a useful optimization, especially for humungous headers |
| 4305 | ($message_headers). */ |
| 4306 | |
| 4307 | if (*s++ == '}') |
| 4308 | { |
| 4309 | int len; |
| 4310 | int newsize = 0; |
| 4311 | if (ptr == 0) |
| 4312 | { |
| 4313 | store_reset(yield); |
| 4314 | yield = NULL; |
| 4315 | size = 0; |
| 4316 | } |
| 4317 | value = find_variable(name, FALSE, skipping, &newsize); |
| 4318 | if (value == NULL) |
| 4319 | { |
| 4320 | expand_string_message = |
| 4321 | string_sprintf("unknown variable in \"${%s}\"", name); |
| 4322 | goto EXPAND_FAILED; |
| 4323 | } |
| 4324 | len = Ustrlen(value); |
| 4325 | if (yield == NULL && newsize != 0) |
| 4326 | { |
| 4327 | yield = value; |
| 4328 | size = newsize; |
| 4329 | ptr = len; |
| 4330 | } |
| 4331 | else yield = string_cat(yield, &size, &ptr, value, len); |
| 4332 | continue; |
| 4333 | } |
| 4334 | |
| 4335 | /* Else there's something wrong */ |
| 4336 | |
| 4337 | expand_string_message = |
| 4338 | string_sprintf("\"${%s\" is not a known operator (or a } is missing " |
| 4339 | "in a variable reference)", name); |
| 4340 | goto EXPAND_FAILED; |
| 4341 | } |
| 4342 | |
| 4343 | /* If we hit the end of the string when ket_ends is set, there is a missing |
| 4344 | terminating brace. */ |
| 4345 | |
| 4346 | if (ket_ends && *s == 0) |
| 4347 | { |
| 4348 | expand_string_message = malformed_header? |
| 4349 | US"missing } at end of string - could be header name not terminated by colon" |
| 4350 | : |
| 4351 | US"missing } at end of string"; |
| 4352 | goto EXPAND_FAILED; |
| 4353 | } |
| 4354 | |
| 4355 | /* Expansion succeeded; yield may still be NULL here if nothing was actually |
| 4356 | added to the string. If so, set up an empty string. Add a terminating zero. If |
| 4357 | left != NULL, return a pointer to the terminator. */ |
| 4358 | |
| 4359 | if (yield == NULL) yield = store_get(1); |
| 4360 | yield[ptr] = 0; |
| 4361 | if (left != NULL) *left = s; |
| 4362 | |
| 4363 | /* Any stacking store that was used above the final string is no longer needed. |
| 4364 | In many cases the final string will be the first one that was got and so there |
| 4365 | will be optimal store usage. */ |
| 4366 | |
| 4367 | store_reset(yield + ptr + 1); |
| 4368 | DEBUG(D_expand) |
| 4369 | { |
| 4370 | debug_printf("expanding: %.*s\n result: %s\n", (int)(s - string), string, |
| 4371 | yield); |
| 4372 | if (skipping) debug_printf("skipping: result is not used\n"); |
| 4373 | } |
| 4374 | return yield; |
| 4375 | |
| 4376 | /* This is the failure exit: easiest to program with a goto. We still need |
| 4377 | to update the pointer to the terminator, for cases of nested calls with "fail". |
| 4378 | */ |
| 4379 | |
| 4380 | EXPAND_FAILED_CURLY: |
| 4381 | expand_string_message = malformed_header? |
| 4382 | US"missing or misplaced { or } - could be header name not terminated by colon" |
| 4383 | : |
| 4384 | US"missing or misplaced { or }"; |
| 4385 | |
| 4386 | /* At one point, Exim reset the store to yield (if yield was not NULL), but |
| 4387 | that is a bad idea, because expand_string_message is in dynamic store. */ |
| 4388 | |
| 4389 | EXPAND_FAILED: |
| 4390 | if (left != NULL) *left = s; |
| 4391 | DEBUG(D_expand) |
| 4392 | { |
| 4393 | debug_printf("failed to expand: %s\n", string); |
| 4394 | debug_printf(" error message: %s\n", expand_string_message); |
| 4395 | if (expand_string_forcedfail) debug_printf("failure was forced\n"); |
| 4396 | } |
| 4397 | return NULL; |
| 4398 | } |
| 4399 | |
| 4400 | |
| 4401 | /* This is the external function call. Do a quick check for any expansion |
| 4402 | metacharacters, and if there are none, just return the input string. |
| 4403 | |
| 4404 | Argument: the string to be expanded |
| 4405 | Returns: the expanded string, or NULL if expansion failed; if failure was |
| 4406 | due to a lookup deferring, search_find_defer will be TRUE |
| 4407 | */ |
| 4408 | |
| 4409 | uschar * |
| 4410 | expand_string(uschar *string) |
| 4411 | { |
| 4412 | search_find_defer = FALSE; |
| 4413 | malformed_header = FALSE; |
| 4414 | return (Ustrpbrk(string, "$\\") == NULL)? string : |
| 4415 | expand_string_internal(string, FALSE, NULL, FALSE); |
| 4416 | } |
| 4417 | |
| 4418 | |
| 4419 | |
| 4420 | /************************************************* |
| 4421 | * Expand and copy * |
| 4422 | *************************************************/ |
| 4423 | |
| 4424 | /* Now and again we want to expand a string and be sure that the result is in a |
| 4425 | new bit of store. This function does that. |
| 4426 | |
| 4427 | Argument: the string to be expanded |
| 4428 | Returns: the expanded string, always in a new bit of store, or NULL |
| 4429 | */ |
| 4430 | |
| 4431 | uschar * |
| 4432 | expand_string_copy(uschar *string) |
| 4433 | { |
| 4434 | uschar *yield = expand_string(string); |
| 4435 | if (yield == string) yield = string_copy(string); |
| 4436 | return yield; |
| 4437 | } |
| 4438 | |
| 4439 | |
| 4440 | |
| 4441 | /************************************************* |
| 4442 | * Expand and interpret as an integer * |
| 4443 | *************************************************/ |
| 4444 | |
| 4445 | /* Expand a string, and convert the result into an integer. |
| 4446 | |
| 4447 | Argument: the string to be expanded |
| 4448 | |
| 4449 | Returns: the integer value, or |
| 4450 | -1 for an expansion error ) in both cases, message in |
| 4451 | -2 for an integer interpretation error ) expand_string_message |
| 4452 | |
| 4453 | */ |
| 4454 | |
| 4455 | int |
| 4456 | expand_string_integer(uschar *string) |
| 4457 | { |
| 4458 | long int value; |
| 4459 | uschar *s = expand_string(string); |
| 4460 | uschar *msg = US"invalid integer \"%s\""; |
| 4461 | uschar *endptr; |
| 4462 | |
| 4463 | if (s == NULL) return -1; |
| 4464 | |
| 4465 | /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno |
| 4466 | to ERANGE. When there isn't an overflow, errno is not changed, at least on some |
| 4467 | systems, so we set it zero ourselves. */ |
| 4468 | |
| 4469 | errno = 0; |
| 4470 | value = strtol(CS s, CSS &endptr, 0); |
| 4471 | |
| 4472 | if (endptr == s) |
| 4473 | { |
| 4474 | msg = US"integer expected but \"%s\" found"; |
| 4475 | } |
| 4476 | else |
| 4477 | { |
| 4478 | /* Ensure we can cast this down to an int */ |
| 4479 | if (value > INT_MAX || value < INT_MIN) errno = ERANGE; |
| 4480 | |
| 4481 | if (errno != ERANGE) |
| 4482 | { |
| 4483 | if (tolower(*endptr) == 'k') |
| 4484 | { |
| 4485 | if (value > INT_MAX/1024 || value < INT_MIN/1024) errno = ERANGE; |
| 4486 | else value *= 1024; |
| 4487 | endptr++; |
| 4488 | } |
| 4489 | else if (tolower(*endptr) == 'm') |
| 4490 | { |
| 4491 | if (value > INT_MAX/(1024*1024) || value < INT_MIN/(1024*1024)) |
| 4492 | errno = ERANGE; |
| 4493 | else value *= 1024*1024; |
| 4494 | endptr++; |
| 4495 | } |
| 4496 | } |
| 4497 | if (errno == ERANGE) |
| 4498 | msg = US"absolute value of integer \"%s\" is too large (overflow)"; |
| 4499 | else |
| 4500 | { |
| 4501 | while (isspace(*endptr)) endptr++; |
| 4502 | if (*endptr == 0) return (int)value; |
| 4503 | } |
| 4504 | } |
| 4505 | |
| 4506 | expand_string_message = string_sprintf(CS msg, s); |
| 4507 | return -2; |
| 4508 | } |
| 4509 | |
| 4510 | |
| 4511 | |
| 4512 | /************************************************* |
| 4513 | ************************************************** |
| 4514 | * Stand-alone test program * |
| 4515 | ************************************************** |
| 4516 | *************************************************/ |
| 4517 | |
| 4518 | #ifdef STAND_ALONE |
| 4519 | |
| 4520 | |
| 4521 | BOOL |
| 4522 | regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup) |
| 4523 | { |
| 4524 | int ovector[3*(EXPAND_MAXN+1)]; |
| 4525 | int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options, |
| 4526 | ovector, sizeof(ovector)/sizeof(int)); |
| 4527 | BOOL yield = n >= 0; |
| 4528 | if (n == 0) n = EXPAND_MAXN + 1; |
| 4529 | if (yield) |
| 4530 | { |
| 4531 | int nn; |
| 4532 | expand_nmax = (setup < 0)? 0 : setup + 1; |
| 4533 | for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2) |
| 4534 | { |
| 4535 | expand_nstring[expand_nmax] = subject + ovector[nn]; |
| 4536 | expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; |
| 4537 | } |
| 4538 | expand_nmax--; |
| 4539 | } |
| 4540 | return yield; |
| 4541 | } |
| 4542 | |
| 4543 | |
| 4544 | int main(int argc, uschar **argv) |
| 4545 | { |
| 4546 | int i; |
| 4547 | uschar buffer[1024]; |
| 4548 | |
| 4549 | debug_selector = D_v; |
| 4550 | debug_file = stderr; |
| 4551 | debug_fd = fileno(debug_file); |
| 4552 | big_buffer = malloc(big_buffer_size); |
| 4553 | |
| 4554 | for (i = 1; i < argc; i++) |
| 4555 | { |
| 4556 | if (argv[i][0] == '+') |
| 4557 | { |
| 4558 | debug_trace_memory = 2; |
| 4559 | argv[i]++; |
| 4560 | } |
| 4561 | if (isdigit(argv[i][0])) |
| 4562 | debug_selector = Ustrtol(argv[i], NULL, 0); |
| 4563 | else |
| 4564 | if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") == |
| 4565 | Ustrlen(argv[i])) |
| 4566 | { |
| 4567 | #ifdef LOOKUP_LDAP |
| 4568 | eldap_default_servers = argv[i]; |
| 4569 | #endif |
| 4570 | #ifdef LOOKUP_MYSQL |
| 4571 | mysql_servers = argv[i]; |
| 4572 | #endif |
| 4573 | #ifdef LOOKUP_PGSQL |
| 4574 | pgsql_servers = argv[i]; |
| 4575 | #endif |
| 4576 | } |
| 4577 | #ifdef EXIM_PERL |
| 4578 | else opt_perl_startup = argv[i]; |
| 4579 | #endif |
| 4580 | } |
| 4581 | |
| 4582 | printf("Testing string expansion: debug_level = %d\n\n", debug_level); |
| 4583 | |
| 4584 | expand_nstring[1] = US"string 1...."; |
| 4585 | expand_nlength[1] = 8; |
| 4586 | expand_nmax = 1; |
| 4587 | |
| 4588 | #ifdef EXIM_PERL |
| 4589 | if (opt_perl_startup != NULL) |
| 4590 | { |
| 4591 | uschar *errstr; |
| 4592 | printf("Starting Perl interpreter\n"); |
| 4593 | errstr = init_perl(opt_perl_startup); |
| 4594 | if (errstr != NULL) |
| 4595 | { |
| 4596 | printf("** error in perl_startup code: %s\n", errstr); |
| 4597 | return EXIT_FAILURE; |
| 4598 | } |
| 4599 | } |
| 4600 | #endif /* EXIM_PERL */ |
| 4601 | |
| 4602 | while (fgets(buffer, sizeof(buffer), stdin) != NULL) |
| 4603 | { |
| 4604 | void *reset_point = store_get(0); |
| 4605 | uschar *yield = expand_string(buffer); |
| 4606 | if (yield != NULL) |
| 4607 | { |
| 4608 | printf("%s\n", yield); |
| 4609 | store_reset(reset_point); |
| 4610 | } |
| 4611 | else |
| 4612 | { |
| 4613 | if (search_find_defer) printf("search_find deferred\n"); |
| 4614 | printf("Failed: %s\n", expand_string_message); |
| 4615 | if (expand_string_forcedfail) printf("Forced failure\n"); |
| 4616 | printf("\n"); |
| 4617 | } |
| 4618 | } |
| 4619 | |
| 4620 | search_tidyup(); |
| 4621 | |
| 4622 | return 0; |
| 4623 | } |
| 4624 | |
| 4625 | #endif |
| 4626 | |
| 4627 | /* End of expand.c */ |