src/src/exim.h

   1 /* $Cambridge: exim/src/src/exim.h,v 1.10 2005/03/22 14:11:54 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2005 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* Source files for exim all #include this header, which drags in everything
  12 that is needed. They don't all need everything, of course, but it's far too
  13 messy to have each one importing its own list, and anyway, most of them need
  14 most of these includes. */
  15
  16 /* Assume most systems have statfs() unless os.h undefines this macro */
  17
  18 #define HAVE_STATFS
  19
  20 /* First of all include the os-specific header, which might set things that
  21 are needed by any of the other headers, including system headers. */
  22
  23 #include "os.h"
  24
  25 /* If it didn't define os_find_running_interfaces, use the common function. */
  26
  27 #ifndef os_find_running_interfaces
  28 #define os_find_running_interfaces os_common_find_running_interfaces
  29 #endif
  30
  31 /* If it didn't define the base for "base 62" numbers, we really do use 62.
  32 This is the case for all real Unix and Unix-like OS. It's only Cygwin and
  33 Darwin, with their case-insensitive file systems, that can't use base 62 for
  34 making unique names. */
  35
  36 #ifndef BASE_62
  37 #define BASE_62 62
  38 #endif
  39
  40 /* The maximum value of localhost_number depends on the base being used */
  41
  42 #if BASE_62 == 62
  43 #define LOCALHOST_MAX  16
  44 #else
  45 #define LOCALHOST_MAX  10
  46 #endif
  47
  48 /* ANSI C standard includes */
  49
  50 #include <ctype.h>
  51 #include <locale.h>
  52 #include <signal.h>
  53 #include <stdarg.h>
  54 #include <stddef.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59
  60 /* Unix includes */
  61
  62 #include <errno.h>
  63 #if defined(__svr4__) && defined(__sparc) && ! defined(__EXTENSIONS__)
  64 #define __EXTENSIONS__  /* so that SunOS 5 gets NGROUPS_MAX */
  65 #include <limits.h>
  66 #undef  __EXTENSIONS__
  67 #else
  68 #include <limits.h>
  69 #endif
  70
  71 /* Just in case some aged system doesn't define them... */
  72
  73 #ifndef INT_MAX
  74 #define INT_MAX 2147483647
  75 #endif
  76
  77 #ifndef UCHAR_MAX
  78 #define UCHAR_MAX 255
  79 #endif
  80
  81 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
  82
  83 #ifndef PATH_MAX
  84 #ifdef MAX_PATH_LEN
  85 #define PATH_MAX MAX_PATH_LEN
  86 #else
  87 #define PATH_MAX 1024
  88 #endif
  89 #endif
  90
  91 #include <sys/types.h>
  92 #include <sys/file.h>
  93 #include <dirent.h>
  94 #include <netdb.h>
  95 #include <pwd.h>
  96 #include <grp.h>
  97 #include <syslog.h>
  98
  99 /* Not all systems have flock() available. Those that do must define LOCK_SH
 100 in sys/file.h. */
 101
 102 #ifndef LOCK_SH
 103 #define NO_FLOCK
 104 #endif
 105
 106 #ifndef NO_SYSEXITS        /* some OS don't have this */
 107 #include <sysexits.h>
 108 #endif
 109
 110 /* A few OS don't have socklen_t; their os.h files define EXIM_SOCKLEN_T to
 111 be size_t or whatever. We used to use SOCKLEN_T, but then it was discovered
 112 that this is used by the AIX include files. */
 113
 114 #ifndef EXIM_SOCKLEN_T
 115 #define EXIM_SOCKLEN_T socklen_t
 116 #endif
 117
 118 /* Ensure that the sysexits we reference are defined */
 119
 120 #ifndef EX_UNAVAILABLE
 121 #define EX_UNAVAILABLE 69        /* service unavailable; used for execv fail */
 122 #endif
 123 #ifndef EX_CANTCREAT
 124 #define EX_CANTCREAT   73        /* can't create file: treat as temporary */
 125 #endif
 126 #ifndef EX_TEMPFAIL
 127 #define EX_TEMPFAIL    75        /* temp failure; user is invited to retry */
 128 #endif
 129 #ifndef EX_CONFIG
 130 #define EX_CONFIG      78        /* configuration error */
 131 #endif
 132
 133 /* This one is not in any sysexits file that I've come across */
 134
 135 #define EX_EXECFAILED 127        /* execve() failed */
 136
 137
 138 #include <sys/time.h>
 139 #include <sys/param.h>
 140
 141 #ifndef NO_SYS_RESOURCE_H  /* QNX doesn't have this */
 142 #include <sys/resource.h>
 143 #endif
 144
 145 #include <sys/socket.h>
 146
 147 /* If we are on an IPv6 system, the macro AF_INET6 will have been defined in
 148 the sys/socket.h header. It is helpful to have this defined on an IPv4 system
 149 so that it can appear in the code, even if it is never actually used when
 150 the code is run. It saves some #ifdef occurrences. */
 151
 152 #ifndef AF_INET6
 153 #define AF_INET6 24
 154 #endif
 155
 156 #include <sys/ioctl.h>
 157
 158 /* The new standard is statvfs; some OS have statfs. For statvfs the block
 159 counts must be multiplied by the "fragment size" f_frsize to get the actual
 160 size. In other cases the value seems to be f_bsize (which is sometimes the only
 161 block size), so we use a macro to get that instead.
 162
 163 Also arrange to be able to cut it out altogether for way-out OS that don't have
 164 anything. I've indented a bit here to try to make the mess a bit more
 165 intelligible. Note that simply defining one name to be another when
 166 HAVE_SYS_STATVFS_H is not set will not work if the system has a statvfs macro
 167 or a macro with entries f_frsize and f_bsize. */
 168
 169 #ifdef HAVE_STATFS
 170   #ifdef HAVE_SYS_STATVFS_H
 171     #include <sys/statvfs.h>
 172     #define STATVFS statvfs
 173     #define F_FRSIZE f_frsize
 174   #else
 175     #define STATVFS statfs
 176     #define F_FRSIZE f_bsize
 177     #ifdef HAVE_SYS_VFS_H
 178       #include <sys/vfs.h>
 179       #ifdef HAVE_SYS_STATFS_H
 180       #include <sys/statfs.h>
 181       #endif
 182     #endif
 183     #ifdef HAVE_SYS_MOUNT_H
 184     #include <sys/mount.h>
 185     #endif
 186   #endif
 187
 188   /* Macros for the fields for the available space for non-superusers; define
 189   these only if the OS header has not. Not all OS have f_favail; those that
 190   are known to have it define F_FAVAIL as f_favail. The default is to use
 191   f_free. */
 192
 193   #ifndef F_BAVAIL
 194   #define F_BAVAIL f_bavail
 195   #endif
 196
 197   #ifndef F_FAVAIL
 198   #define F_FAVAIL f_ffree
 199   #endif
 200
 201   /* All the systems I've been able to look at seem to have F_FILES */
 202
 203   #ifndef F_FILES
 204   #define F_FILES  f_files
 205   #endif
 206
 207 #endif
 208
 209
 210 #ifndef  SIOCGIFCONF   /* HACK for SunOS 5 */
 211 #include <sys/sockio.h>
 212 #endif
 213
 214 #include <sys/stat.h>
 215 #include <sys/wait.h>
 216 #include <sys/utsname.h>
 217 #include <fcntl.h>
 218
 219 /* There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
 220 with the definition in sysexits.h. Arrange to preserve it, even though at
 221 present Exim doesn't actually use it. */
 222
 223 #ifdef EX_OK
 224 #define SAVE_EX_OK EX_OK
 225 #undef EX_OK
 226 #endif
 227
 228 #include <unistd.h>
 229
 230 #ifdef SAVE_EX_OK
 231 #ifdef EX_OK
 232 #undef EX_OK
 233 #endif
 234 #define EX_OK SAVE_EX_OK
 235 #endif
 236
 237 #include <utime.h>
 238 #ifndef NO_NET_IF_H
 239 #include <net/if.h>
 240 #endif
 241 #include <sys/un.h>
 242 #include <netinet/in.h>
 243 #include <netinet/tcp.h>
 244 #include <arpa/inet.h>
 245 #include <arpa/nameser.h>
 246
 247
 248 /* If arpa/nameser.h defines a maximum name server packet size, use it,
 249 provided it is greater than 2048. Otherwise go for a default. PACKETSZ was used
 250 for this, but it seems that NS_PACKETSZ is coming into use. */
 251
 252 #if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
 253   #define MAXPACKET NS_PACKETSZ
 254 #elif defined(PACKETSZ) && PACKETSZ >= 2048
 255   #define MAXPACKET PACKETSZ
 256 #else
 257   #define MAXPACKET 2048
 258 #endif
 259
 260 /* While IPv6 is still young the definitions of T_AAAA and T_A6 may not be
 261 included in arpa/nameser.h. Fudge them here. */
 262
 263 #ifndef T_AAAA
 264 #define T_AAAA 28
 265 #endif
 266
 267 #ifndef T_A6
 268 #define T_A6 38
 269 #endif
 270
 271 /* Ancient systems (e.g. SunOS4) don't appear to have T_TXT defined in their
 272 header files. I don't suppose they have T_SRV either. */
 273
 274 #ifndef T_TXT
 275 #define T_TXT 16
 276 #endif
 277
 278 #ifndef T_SRV
 279 #define T_SRV 33
 280 #endif
 281
 282 /* We use the private type T_ZNS for retrieving the nameservers for the
 283 enclosing zone of a domain, and the private type T_MXH for retrieving
 284 the MX hostnames only (without their priorities). */
 285
 286 #define T_ZNS (-1)
 287 #define T_MXH (-2)
 288
 289 /* The resolv.h header defines __P(x) on some Solaris 2.5.1 systems (without
 290 checking that it is already defined, in fact). This conflicts with other
 291 headers that behave likewise (see below), leading to compiler warnings. Arrange
 292 to undefine it if resolv.h defines it. */
 293
 294 #if defined(__P)
 295 #define __P_WAS_DEFINED_BEFORE_RESOLV
 296 #endif
 297
 298 #include <resolv.h>
 299
 300 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
 301 #undef __P
 302 #endif
 303
 304 /* These three are to support the IP option logging code. Linux is
 305 different to everyone else and there are also other systems which don't
 306 have netinet/ip_var.h, so there's a general macro to control its inclusion. */
 307
 308 #include <netinet/in_systm.h>
 309 #include <netinet/ip.h>
 310
 311 #ifndef NO_IP_VAR_H
 312 #include <netinet/ip_var.h>
 313 #endif
 314
 315 /* Linux (and some others) uses a different type for the 2nd argument of
 316 iconv(). It's os.h file defines ICONV_ARG2_TYPE. For the rest, define a default
 317 here. */
 318
 319 #ifndef ICONV_ARG2_TYPE
 320 #define ICONV_ARG2_TYPE const char **
 321 #endif
 322
 323 /* One OS uses a different type for the 5th argument of getsockopt */
 324
 325 #ifndef GETSOCKOPT_ARG5_TYPE
 326 #define GETSOCKOPT_ARG5_TYPE socklen_t *
 327 #endif
 328
 329 /* One operating system uses a different type for the 2nd argument of select().
 330 Its os.h file defines SELECT_ARG2_TYPE. For the rest, define a default here. */
 331
 332 #ifndef SELECT_ARG2_TYPE
 333 #define SELECT_ARG2_TYPE fd_set
 334 #endif
 335
 336 /* One operating system uses a different type for the 4th argument of
 337 dn_expand(). Its os.h file defines DN_EXPAND_ARG4_TYPE. For the rest, define a
 338 default here. */
 339
 340 #ifndef DN_EXPAND_ARG4_TYPE
 341 #define DN_EXPAND_ARG4_TYPE char *
 342 #endif
 343
 344 /* One operating system defines a different type for the yield of inet_addr().
 345 In Exim code, its value is always assigned to the s_addr members of address
 346 structures. Casting the yield to the type of s_addr should fix the problem,
 347 since the size of the data is correct. Just in case this ever has to be
 348 changed, use a macro for the type, and define it here so that it is possible to
 349 use different values for specific OS if ever necessary. */
 350
 351 #ifndef S_ADDR_TYPE
 352 #define S_ADDR_TYPE u_long
 353 #endif
 354
 355 /* (At least) one operating system (Solaris) defines a different type for the
 356 second argument of pam_converse() - the difference is the absence of "const".
 357 Its os.h file defines PAM_CONVERSE_ARG2_TYPE. For the rest, define a default
 358 here. */
 359
 360 #ifndef PAM_CONVERSE_ARG2_TYPE
 361 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
 362 #endif
 363
 364 /* One operating system (SunOS4) defines getc, ungetc, feof, and ferror as
 365 macros and not as functions. Exim needs them to be assignable functions. This
 366 flag gets set to cause this to be sorted out here. */
 367
 368 #ifdef FUDGE_GETC_AND_FRIENDS
 369 #undef getc
 370 extern int getc(FILE *);
 371 #undef ungetc
 372 extern int ungetc(int, FILE *);
 373 #undef feof
 374 extern int feof(FILE *);
 375 #undef ferror
 376 extern int ferror(FILE *);
 377 #endif
 378
 379 /* The header from the PCRE regex package */
 380
 381 #include "pcre/pcre.h"
 382
 383 /* Exim includes are in several files. Note that local_scan.h #includes
 384 mytypes.h and store.h, so we don't need to mention them explicitly. */
 385
 386 #include "config.h"
 387
 388 #include "local_scan.h"
 389 #include "macros.h"
 390 #include "dbstuff.h"
 391 #include "structs.h"
 392 #include "globals.h"
 393 #include "functions.h"
 394 #include "dbfunctions.h"
 395 #include "osfunctions.h"
 396
 397 #ifdef EXPERIMENTAL_BRIGHTMAIL
 398 #include "bmi_spam.h"
 399 #endif
 400 #ifdef EXPERIMENTAL_SPF
 401 #include "spf.h"
 402 #endif
 403 #ifdef EXPERIMENTAL_SRS
 404 #include "srs.h"
 405 #endif
 406 #ifdef EXPERIMENTAL_DOMAINKEYS
 407 #include "dk.h"
 408 #endif
 409
 410 /* The following stuff must follow the inclusion of config.h because it
 411 requires various things that are set therein. */
 412
 413 #if HAVE_ICONV             /* Not all OS have this */
 414 #include <iconv.h>
 415 #endif
 416
 417 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC)
 418 #include <dlfcn.h>
 419 #endif
 420
 421 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
 422
 423 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
 424 #define LOOKUP_LSEARCH yes
 425 #endif
 426
 427 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
 428 simplifies some of the coding. */
 429
 430 union sockaddr_46 {
 431   struct sockaddr_in v4;
 432   #if HAVE_IPV6
 433   struct sockaddr_in6 v6;
 434   #endif
 435 };
 436
 437 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
 438 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
 439
 440 #ifndef SUPPORT_TLS
 441 #undef USE_GNUTLS
 442 #endif
 443
 444 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
 445 set them to the null string. */
 446
 447 #ifndef SPOOL_DIRECTORY
 448   #define SPOOL_DIRECTORY ""
 449 #endif
 450 #ifndef LOG_FILE_PATH
 451   #define LOG_FILE_PATH ""
 452 #endif
 453 #ifndef PID_FILE_PATH
 454   #define PID_FILE_PATH ""
 455 #endif
 456
 457 /* The EDQUOT error code isn't universally available, though it is widespread.
 458 There is a particular shambles in SunOS5, where it did not exist originally,
 459 but got installed with a particular patch for Solaris 2.4. There is a
 460 configuration variable for specifying what the system's "over quota" error is,
 461 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
 462 default to EDQUOT if it exists, otherwise ENOSPC. */
 463
 464 #ifndef ERRNO_QUOTA
 465 #ifdef  EDQUOT
 466 #define ERRNO_QUOTA EDQUOT
 467 #else
 468 #define ERRNO_QUOTA ENOSPC
 469 #endif
 470 #endif
 471
 472 /* Ensure PATH_MAX is defined */
 473
 474 #ifndef PATH_MAX
 475   #ifdef MAXPATHLEN
 476   #define PATH_MAX MAXPATHLEN
 477   #else
 478   #define PATH_MAX 1024
 479   #endif
 480 #endif
 481
 482
 483 /* End of exim.h */