src/src/exim.h

   1 /* $Cambridge: exim/src/src/exim.h,v 1.27 2009/11/16 19:50:36 nm4 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   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 /* Similarly, assume most systems have srandom() unless os.h undefines it.
  21 This call dates back at least as far as SUSv2. */
  22
  23 #define HAVE_SRANDOM
  24
  25 /* First of all include the os-specific header, which might set things that
  26 are needed by any of the other headers, including system headers. */
  27
  28 #include "os.h"
  29
  30 /* If it didn't define os_find_running_interfaces, use the common function. */
  31
  32 #ifndef os_find_running_interfaces
  33 #define os_find_running_interfaces os_common_find_running_interfaces
  34 #endif
  35
  36 /* If it didn't define the base for "base 62" numbers, we really do use 62.
  37 This is the case for all real Unix and Unix-like OS. It's only Cygwin and
  38 Darwin, with their case-insensitive file systems, that can't use base 62 for
  39 making unique names. */
  40
  41 #ifndef BASE_62
  42 #define BASE_62 62
  43 #endif
  44
  45 /* The maximum value of localhost_number depends on the base being used */
  46
  47 #if BASE_62 == 62
  48 #define LOCALHOST_MAX  16
  49 #else
  50 #define LOCALHOST_MAX  10
  51 #endif
  52
  53 /* ANSI C standard includes */
  54
  55 #include <ctype.h>
  56 #include <locale.h>
  57 #include <math.h>
  58 #include <signal.h>
  59 #include <stdarg.h>
  60 #include <stddef.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <time.h>
  65
  66 /* Unix includes */
  67
  68 #include <errno.h>
  69 #if defined(__svr4__) && defined(__sparc) && ! defined(__EXTENSIONS__)
  70 #define __EXTENSIONS__  /* so that SunOS 5 gets NGROUPS_MAX */
  71 #include <limits.h>
  72 #undef  __EXTENSIONS__
  73 #else
  74 #include <limits.h>
  75 #endif
  76
  77 /* Just in case some aged system doesn't define them... */
  78
  79 #ifndef INT_MAX
  80 #define INT_MAX 2147483647
  81 #endif
  82
  83 #ifndef INT_MIN
  84 #define INT_MIN (-INT_MAX - 1)
  85 #endif
  86
  87 #ifndef SHRT_MAX
  88 #define SHRT_MAX 32767
  89 #endif
  90
  91 #ifndef UCHAR_MAX
  92 #define UCHAR_MAX 255
  93 #endif
  94
  95 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
  96
  97 #ifndef PATH_MAX
  98 #ifdef MAX_PATH_LEN
  99 #define PATH_MAX MAX_PATH_LEN
 100 #else
 101 #define PATH_MAX 1024
 102 #endif
 103 #endif
 104
 105 #include <sys/types.h>
 106 #include <sys/file.h>
 107 #include <dirent.h>
 108 #include <netdb.h>
 109 #ifndef NO_POLL_H
 110 #include <poll.h>
 111 #endif
 112 #include <pwd.h>
 113 #include <grp.h>
 114 #include <syslog.h>
 115
 116 /* Not all systems have flock() available. Those that do must define LOCK_SH
 117 in sys/file.h. */
 118
 119 #ifndef LOCK_SH
 120 #define NO_FLOCK
 121 #endif
 122
 123 #ifndef NO_SYSEXITS        /* some OS don't have this */
 124 #include <sysexits.h>
 125 #endif
 126
 127 /* A few OS don't have socklen_t; their os.h files define EXIM_SOCKLEN_T to
 128 be size_t or whatever. We used to use SOCKLEN_T, but then it was discovered
 129 that this is used by the AIX include files. */
 130
 131 #ifndef EXIM_SOCKLEN_T
 132 #define EXIM_SOCKLEN_T socklen_t
 133 #endif
 134
 135 /* Ensure that the sysexits we reference are defined */
 136
 137 #ifndef EX_UNAVAILABLE
 138 #define EX_UNAVAILABLE 69        /* service unavailable; used for execv fail */
 139 #endif
 140 #ifndef EX_CANTCREAT
 141 #define EX_CANTCREAT   73        /* can't create file: treat as temporary */
 142 #endif
 143 #ifndef EX_TEMPFAIL
 144 #define EX_TEMPFAIL    75        /* temp failure; user is invited to retry */
 145 #endif
 146 #ifndef EX_CONFIG
 147 #define EX_CONFIG      78        /* configuration error */
 148 #endif
 149
 150 /* This one is not in any sysexits file that I've come across */
 151
 152 #define EX_EXECFAILED 127        /* execve() failed */
 153
 154
 155 #include <sys/time.h>
 156 #include <sys/param.h>
 157
 158 #ifndef NO_SYS_RESOURCE_H  /* QNX doesn't have this */
 159 #include <sys/resource.h>
 160 #endif
 161
 162 #include <sys/socket.h>
 163
 164 /* If we are on an IPv6 system, the macro AF_INET6 will have been defined in
 165 the sys/socket.h header. It is helpful to have this defined on an IPv4 system
 166 so that it can appear in the code, even if it is never actually used when
 167 the code is run. It saves some #ifdef occurrences. */
 168
 169 #ifndef AF_INET6
 170 #define AF_INET6 24
 171 #endif
 172
 173 #include <sys/ioctl.h>
 174
 175 /* The new standard is statvfs; some OS have statfs. For statvfs the block
 176 counts must be multiplied by the "fragment size" f_frsize to get the actual
 177 size. In other cases the value seems to be f_bsize (which is sometimes the only
 178 block size), so we use a macro to get that instead.
 179
 180 Also arrange to be able to cut it out altogether for way-out OS that don't have
 181 anything. I've indented a bit here to try to make the mess a bit more
 182 intelligible. Note that simply defining one name to be another when
 183 HAVE_SYS_STATVFS_H is not set will not work if the system has a statvfs macro
 184 or a macro with entries f_frsize and f_bsize. */
 185
 186 #ifdef HAVE_STATFS
 187   #ifdef HAVE_SYS_STATVFS_H
 188     #include <sys/statvfs.h>
 189     #define STATVFS statvfs
 190     #define F_FRSIZE f_frsize
 191   #else
 192     #define STATVFS statfs
 193     #define F_FRSIZE f_bsize
 194     #ifdef HAVE_SYS_VFS_H
 195       #include <sys/vfs.h>
 196       #ifdef HAVE_SYS_STATFS_H
 197       #include <sys/statfs.h>
 198       #endif
 199     #endif
 200     #ifdef HAVE_SYS_MOUNT_H
 201     #include <sys/mount.h>
 202     #endif
 203   #endif
 204
 205   /* Macros for the fields for the available space for non-superusers; define
 206   these only if the OS header has not. Not all OS have f_favail; those that
 207   are known to have it define F_FAVAIL as f_favail. The default is to use
 208   f_free. */
 209
 210   #ifndef F_BAVAIL
 211   #define F_BAVAIL f_bavail
 212   #endif
 213
 214   #ifndef F_FAVAIL
 215   #define F_FAVAIL f_ffree
 216   #endif
 217
 218   /* All the systems I've been able to look at seem to have F_FILES */
 219
 220   #ifndef F_FILES
 221   #define F_FILES  f_files
 222   #endif
 223
 224 #endif
 225
 226
 227 #ifndef  SIOCGIFCONF   /* HACK for SunOS 5 */
 228 #include <sys/sockio.h>
 229 #endif
 230
 231 #include <sys/stat.h>
 232 #include <sys/wait.h>
 233 #include <sys/utsname.h>
 234 #include <fcntl.h>
 235
 236 /* There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
 237 with the definition in sysexits.h. Exim does not actually use this macro, so we
 238 just undefine it. It would be nice to be able to re-instate the definition from
 239 sysexits.h if there is no definition in unistd.h, but I do not think there is a
 240 way to do this in C because macro definitions are not scanned for other macros
 241 at definition time. [The code here used to assume they were, until I was
 242 disabused of the notion. Luckily, since EX_OK is not used, it didn't matter.] */
 243
 244 #ifdef EX_OK
 245 #undef EX_OK
 246 #endif
 247
 248 #include <unistd.h>
 249
 250 #include <utime.h>
 251 #ifndef NO_NET_IF_H
 252 #include <net/if.h>
 253 #endif
 254 #include <sys/un.h>
 255 #include <netinet/in.h>
 256 #include <netinet/tcp.h>
 257 #include <arpa/inet.h>
 258 #include <arpa/nameser.h>
 259
 260
 261 /* If arpa/nameser.h defines a maximum name server packet size, use it,
 262 provided it is greater than 2048. Otherwise go for a default. PACKETSZ was used
 263 for this, but it seems that NS_PACKETSZ is coming into use. */
 264
 265 #if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
 266   #define MAXPACKET NS_PACKETSZ
 267 #elif defined(PACKETSZ) && PACKETSZ >= 2048
 268   #define MAXPACKET PACKETSZ
 269 #else
 270   #define MAXPACKET 2048
 271 #endif
 272
 273 /* While IPv6 is still young the definitions of T_AAAA and T_A6 may not be
 274 included in arpa/nameser.h. Fudge them here. */
 275
 276 #ifndef T_AAAA
 277 #define T_AAAA 28
 278 #endif
 279
 280 #ifndef T_A6
 281 #define T_A6 38
 282 #endif
 283
 284 /* Ancient systems (e.g. SunOS4) don't appear to have T_TXT defined in their
 285 header files. I don't suppose they have T_SRV either. */
 286
 287 #ifndef T_TXT
 288 #define T_TXT 16
 289 #endif
 290
 291 #ifndef T_SRV
 292 #define T_SRV 33
 293 #endif
 294
 295 /* It seems that some versions of arpa/nameser.h don't define *any* of the
 296 T_xxx macros, which seem to be non-standard nowadays. Just to be on the safe
 297 side, put in definitions for all the ones that Exim uses. */
 298
 299 #ifndef T_A
 300 #define T_A 1
 301 #endif
 302
 303 #ifndef T_CNAME
 304 #define T_CNAME 5
 305 #endif
 306
 307 #ifndef T_SOA
 308 #define T_SOA 6
 309 #endif
 310
 311 #ifndef T_MX
 312 #define T_MX 15
 313 #endif
 314
 315 #ifndef T_NS
 316 #define T_NS 2
 317 #endif
 318
 319 #ifndef T_PTR
 320 #define T_PTR 12
 321 #endif
 322
 323
 324 /* We define a few private types for special DNS lookups:
 325
 326  . T_ZNS gets the nameservers of the enclosing zone of a domain
 327
 328  . T_MXH gets the MX hostnames only (without their priorities)
 329
 330  . T_CSA gets the domain's Client SMTP Authorization SRV record
 331
 332 */
 333
 334 #define T_ZNS (-1)
 335 #define T_MXH (-2)
 336 #define T_CSA (-3)
 337
 338 /* The resolv.h header defines __P(x) on some Solaris 2.5.1 systems (without
 339 checking that it is already defined, in fact). This conflicts with other
 340 headers that behave likewise (see below), leading to compiler warnings. Arrange
 341 to undefine it if resolv.h defines it. */
 342
 343 #if defined(__P)
 344 #define __P_WAS_DEFINED_BEFORE_RESOLV
 345 #endif
 346
 347 #include <resolv.h>
 348
 349 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
 350 #undef __P
 351 #endif
 352
 353 /* These three are to support the IP option logging code. Linux is
 354 different to everyone else and there are also other systems which don't
 355 have netinet/ip_var.h, so there's a general macro to control its inclusion. */
 356
 357 #include <netinet/in_systm.h>
 358 #include <netinet/ip.h>
 359
 360 #ifndef NO_IP_VAR_H
 361 #include <netinet/ip_var.h>
 362 #endif
 363
 364 /* Linux (and some others) uses a different type for the 2nd argument of
 365 iconv(). It's os.h file defines ICONV_ARG2_TYPE. For the rest, define a default
 366 here. */
 367
 368 #ifndef ICONV_ARG2_TYPE
 369 #define ICONV_ARG2_TYPE const char **
 370 #endif
 371
 372 /* One OS uses a different type for the 5th argument of getsockopt */
 373
 374 #ifndef GETSOCKOPT_ARG5_TYPE
 375 #define GETSOCKOPT_ARG5_TYPE socklen_t *
 376 #endif
 377
 378 /* One operating system uses a different type for the 2nd argument of select().
 379 Its os.h file defines SELECT_ARG2_TYPE. For the rest, define a default here. */
 380
 381 #ifndef SELECT_ARG2_TYPE
 382 #define SELECT_ARG2_TYPE fd_set
 383 #endif
 384
 385 /* One operating system uses a different type for the 4th argument of
 386 dn_expand(). Its os.h file defines DN_EXPAND_ARG4_TYPE. For the rest, define a
 387 default here. */
 388
 389 #ifndef DN_EXPAND_ARG4_TYPE
 390 #define DN_EXPAND_ARG4_TYPE char *
 391 #endif
 392
 393 /* One operating system defines a different type for the yield of inet_addr().
 394 In Exim code, its value is always assigned to the s_addr members of address
 395 structures. Casting the yield to the type of s_addr should fix the problem,
 396 since the size of the data is correct. Just in case this ever has to be
 397 changed, use a macro for the type, and define it here so that it is possible to
 398 use different values for specific OS if ever necessary. */
 399
 400 #ifndef S_ADDR_TYPE
 401 #define S_ADDR_TYPE u_long
 402 #endif
 403
 404 /* (At least) one operating system (Solaris) defines a different type for the
 405 second argument of pam_converse() - the difference is the absence of "const".
 406 Its os.h file defines PAM_CONVERSE_ARG2_TYPE. For the rest, define a default
 407 here. */
 408
 409 #ifndef PAM_CONVERSE_ARG2_TYPE
 410 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
 411 #endif
 412
 413 /* One operating system (SunOS4) defines getc, ungetc, feof, and ferror as
 414 macros and not as functions. Exim needs them to be assignable functions. This
 415 flag gets set to cause this to be sorted out here. */
 416
 417 #ifdef FUDGE_GETC_AND_FRIENDS
 418 #undef getc
 419 extern int getc(FILE *);
 420 #undef ungetc
 421 extern int ungetc(int, FILE *);
 422 #undef feof
 423 extern int feof(FILE *);
 424 #undef ferror
 425 extern int ferror(FILE *);
 426 #endif
 427
 428 /* The header from the PCRE regex package */
 429
 430 #include <pcre.h>
 431
 432 /* Exim includes are in several files. Note that local_scan.h #includes
 433 config.h, mytypes.h, and store.h, so we don't need to mention them explicitly.
 434 */
 435
 436 #include "local_scan.h"
 437 #include "macros.h"
 438 #include "dbstuff.h"
 439 #include "structs.h"
 440 #include "globals.h"
 441 #include "functions.h"
 442 #include "dbfunctions.h"
 443 #include "osfunctions.h"
 444
 445 #ifdef EXPERIMENTAL_BRIGHTMAIL
 446 #include "bmi_spam.h"
 447 #endif
 448 #ifdef EXPERIMENTAL_SPF
 449 #include "spf.h"
 450 #endif
 451 #ifdef EXPERIMENTAL_SRS
 452 #include "srs.h"
 453 #endif
 454 #ifndef DISABLE_DKIM
 455 #include "dkim.h"
 456 #endif
 457
 458 /* The following stuff must follow the inclusion of config.h because it
 459 requires various things that are set therein. */
 460
 461 #if HAVE_ICONV             /* Not all OS have this */
 462 #include <iconv.h>
 463 #endif
 464
 465 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC) || defined (LOOKUP_MODULE_DIR)
 466 #include <dlfcn.h>
 467 #endif
 468
 469 #ifdef ENABLE_DISABLE_FSYNC
 470 #define EXIMfsync(f) (disable_fsync? 0 : fsync(f))
 471 #else
 472 #define EXIMfsync(f) fsync(f)
 473 #endif
 474
 475 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
 476
 477 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
 478 #define LOOKUP_LSEARCH yes
 479 #endif
 480
 481 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
 482 simplifies some of the coding. */
 483
 484 union sockaddr_46 {
 485   struct sockaddr_in v4;
 486   #if HAVE_IPV6
 487   struct sockaddr_in6 v6;
 488   #endif
 489 };
 490
 491 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
 492 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
 493
 494 #ifndef SUPPORT_TLS
 495 #undef USE_GNUTLS
 496 #endif
 497
 498 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
 499 set them to the null string. */
 500
 501 #ifndef SPOOL_DIRECTORY
 502   #define SPOOL_DIRECTORY ""
 503 #endif
 504 #ifndef LOG_FILE_PATH
 505   #define LOG_FILE_PATH ""
 506 #endif
 507 #ifndef PID_FILE_PATH
 508   #define PID_FILE_PATH ""
 509 #endif
 510
 511 /* The EDQUOT error code isn't universally available, though it is widespread.
 512 There is a particular shambles in SunOS5, where it did not exist originally,
 513 but got installed with a particular patch for Solaris 2.4. There is a
 514 configuration variable for specifying what the system's "over quota" error is,
 515 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
 516 default to EDQUOT if it exists, otherwise ENOSPC. */
 517
 518 #ifndef ERRNO_QUOTA
 519 #ifdef  EDQUOT
 520 #define ERRNO_QUOTA EDQUOT
 521 #else
 522 #define ERRNO_QUOTA ENOSPC
 523 #endif
 524 #endif
 525
 526 /* Ensure PATH_MAX is defined */
 527
 528 #ifndef PATH_MAX
 529   #ifdef MAXPATHLEN
 530   #define PATH_MAX MAXPATHLEN
 531   #else
 532   #define PATH_MAX 1024
 533   #endif
 534 #endif
 535
 536 /* These are for reporting version information from various componenents, to
 537 figure out what's actually happening. They need to be available to the main
 538 function, so we declare them here. Unfortunate. */
 539
 540 #ifdef AUTH_CYRUS_SASL
 541 extern void auth_cyrus_sasl_version_report(FILE *);
 542 #endif
 543
 544 /* End of exim.h */