src/src/exim.h

   1 /* $Cambridge: exim/src/src/exim.h,v 1.20 2007/01/02 11:25:00 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   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 <math.h>
  53 #include <signal.h>
  54 #include <stdarg.h>
  55 #include <stddef.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <time.h>
  60
  61 /* Unix includes */
  62
  63 #include <errno.h>
  64 #if defined(__svr4__) && defined(__sparc) && ! defined(__EXTENSIONS__)
  65 #define __EXTENSIONS__  /* so that SunOS 5 gets NGROUPS_MAX */
  66 #include <limits.h>
  67 #undef  __EXTENSIONS__
  68 #else
  69 #include <limits.h>
  70 #endif
  71
  72 /* Just in case some aged system doesn't define them... */
  73
  74 #ifndef INT_MAX
  75 #define INT_MAX 2147483647
  76 #endif
  77
  78 #ifndef INT_MIN
  79 #define INT_MIN (-INT_MAX - 1)
  80 #endif
  81
  82 #ifndef SHRT_MAX
  83 #define SHRT_MAX 32767
  84 #endif
  85
  86 #ifndef UCHAR_MAX
  87 #define UCHAR_MAX 255
  88 #endif
  89
  90 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
  91
  92 #ifndef PATH_MAX
  93 #ifdef MAX_PATH_LEN
  94 #define PATH_MAX MAX_PATH_LEN
  95 #else
  96 #define PATH_MAX 1024
  97 #endif
  98 #endif
  99
 100 #include <sys/types.h>
 101 #include <sys/file.h>
 102 #include <dirent.h>
 103 #include <netdb.h>
 104 #ifndef NO_POLL_H
 105 #include <poll.h>
 106 #endif
 107 #include <pwd.h>
 108 #include <grp.h>
 109 #include <syslog.h>
 110
 111 /* Not all systems have flock() available. Those that do must define LOCK_SH
 112 in sys/file.h. */
 113
 114 #ifndef LOCK_SH
 115 #define NO_FLOCK
 116 #endif
 117
 118 #ifndef NO_SYSEXITS        /* some OS don't have this */
 119 #include <sysexits.h>
 120 #endif
 121
 122 /* A few OS don't have socklen_t; their os.h files define EXIM_SOCKLEN_T to
 123 be size_t or whatever. We used to use SOCKLEN_T, but then it was discovered
 124 that this is used by the AIX include files. */
 125
 126 #ifndef EXIM_SOCKLEN_T
 127 #define EXIM_SOCKLEN_T socklen_t
 128 #endif
 129
 130 /* Ensure that the sysexits we reference are defined */
 131
 132 #ifndef EX_UNAVAILABLE
 133 #define EX_UNAVAILABLE 69        /* service unavailable; used for execv fail */
 134 #endif
 135 #ifndef EX_CANTCREAT
 136 #define EX_CANTCREAT   73        /* can't create file: treat as temporary */
 137 #endif
 138 #ifndef EX_TEMPFAIL
 139 #define EX_TEMPFAIL    75        /* temp failure; user is invited to retry */
 140 #endif
 141 #ifndef EX_CONFIG
 142 #define EX_CONFIG      78        /* configuration error */
 143 #endif
 144
 145 /* This one is not in any sysexits file that I've come across */
 146
 147 #define EX_EXECFAILED 127        /* execve() failed */
 148
 149
 150 #include <sys/time.h>
 151 #include <sys/param.h>
 152
 153 #ifndef NO_SYS_RESOURCE_H  /* QNX doesn't have this */
 154 #include <sys/resource.h>
 155 #endif
 156
 157 #include <sys/socket.h>
 158
 159 /* If we are on an IPv6 system, the macro AF_INET6 will have been defined in
 160 the sys/socket.h header. It is helpful to have this defined on an IPv4 system
 161 so that it can appear in the code, even if it is never actually used when
 162 the code is run. It saves some #ifdef occurrences. */
 163
 164 #ifndef AF_INET6
 165 #define AF_INET6 24
 166 #endif
 167
 168 #include <sys/ioctl.h>
 169
 170 /* The new standard is statvfs; some OS have statfs. For statvfs the block
 171 counts must be multiplied by the "fragment size" f_frsize to get the actual
 172 size. In other cases the value seems to be f_bsize (which is sometimes the only
 173 block size), so we use a macro to get that instead.
 174
 175 Also arrange to be able to cut it out altogether for way-out OS that don't have
 176 anything. I've indented a bit here to try to make the mess a bit more
 177 intelligible. Note that simply defining one name to be another when
 178 HAVE_SYS_STATVFS_H is not set will not work if the system has a statvfs macro
 179 or a macro with entries f_frsize and f_bsize. */
 180
 181 #ifdef HAVE_STATFS
 182   #ifdef HAVE_SYS_STATVFS_H
 183     #include <sys/statvfs.h>
 184     #define STATVFS statvfs
 185     #define F_FRSIZE f_frsize
 186   #else
 187     #define STATVFS statfs
 188     #define F_FRSIZE f_bsize
 189     #ifdef HAVE_SYS_VFS_H
 190       #include <sys/vfs.h>
 191       #ifdef HAVE_SYS_STATFS_H
 192       #include <sys/statfs.h>
 193       #endif
 194     #endif
 195     #ifdef HAVE_SYS_MOUNT_H
 196     #include <sys/mount.h>
 197     #endif
 198   #endif
 199
 200   /* Macros for the fields for the available space for non-superusers; define
 201   these only if the OS header has not. Not all OS have f_favail; those that
 202   are known to have it define F_FAVAIL as f_favail. The default is to use
 203   f_free. */
 204
 205   #ifndef F_BAVAIL
 206   #define F_BAVAIL f_bavail
 207   #endif
 208
 209   #ifndef F_FAVAIL
 210   #define F_FAVAIL f_ffree
 211   #endif
 212
 213   /* All the systems I've been able to look at seem to have F_FILES */
 214
 215   #ifndef F_FILES
 216   #define F_FILES  f_files
 217   #endif
 218
 219 #endif
 220
 221
 222 #ifndef  SIOCGIFCONF   /* HACK for SunOS 5 */
 223 #include <sys/sockio.h>
 224 #endif
 225
 226 #include <sys/stat.h>
 227 #include <sys/wait.h>
 228 #include <sys/utsname.h>
 229 #include <fcntl.h>
 230
 231 /* There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
 232 with the definition in sysexits.h. Exim does not actually use this macro, so we
 233 just undefine it. It would be nice to be able to re-instate the definition from
 234 sysexits.h if there is no definition in unistd.h, but I do not think there is a
 235 way to do this in C because macro definitions are not scanned for other macros
 236 at definition time. [The code here used to assume they were, until I was
 237 disabused of the notion. Luckily, since EX_OK is not used, it didn't matter.] */
 238
 239 #ifdef EX_OK
 240 #undef EX_OK
 241 #endif
 242
 243 #include <unistd.h>
 244
 245 #include <utime.h>
 246 #ifndef NO_NET_IF_H
 247 #include <net/if.h>
 248 #endif
 249 #include <sys/un.h>
 250 #include <netinet/in.h>
 251 #include <netinet/tcp.h>
 252 #include <arpa/inet.h>
 253 #include <arpa/nameser.h>
 254
 255
 256 /* If arpa/nameser.h defines a maximum name server packet size, use it,
 257 provided it is greater than 2048. Otherwise go for a default. PACKETSZ was used
 258 for this, but it seems that NS_PACKETSZ is coming into use. */
 259
 260 #if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
 261   #define MAXPACKET NS_PACKETSZ
 262 #elif defined(PACKETSZ) && PACKETSZ >= 2048
 263   #define MAXPACKET PACKETSZ
 264 #else
 265   #define MAXPACKET 2048
 266 #endif
 267
 268 /* While IPv6 is still young the definitions of T_AAAA and T_A6 may not be
 269 included in arpa/nameser.h. Fudge them here. */
 270
 271 #ifndef T_AAAA
 272 #define T_AAAA 28
 273 #endif
 274
 275 #ifndef T_A6
 276 #define T_A6 38
 277 #endif
 278
 279 /* Ancient systems (e.g. SunOS4) don't appear to have T_TXT defined in their
 280 header files. I don't suppose they have T_SRV either. */
 281
 282 #ifndef T_TXT
 283 #define T_TXT 16
 284 #endif
 285
 286 #ifndef T_SRV
 287 #define T_SRV 33
 288 #endif
 289
 290 /* It seems that some versions of arpa/nameser.h don't define *any* of the
 291 T_xxx macros, which seem to be non-standard nowadays. Just to be on the safe
 292 side, put in definitions for all the ones that Exim uses. */
 293
 294 #ifndef T_A
 295 #define T_A 1
 296 #endif
 297
 298 #ifndef T_CNAME
 299 #define T_CNAME 5
 300 #endif
 301
 302 #ifndef T_SOA
 303 #define T_SOA 6
 304 #endif
 305
 306 #ifndef T_MX
 307 #define T_MX 15
 308 #endif
 309
 310 #ifndef T_NS
 311 #define T_NS 2
 312 #endif
 313
 314 #ifndef T_PTR
 315 #define T_PTR 12
 316 #endif
 317
 318
 319 /* We define a few private types for special DNS lookups:
 320
 321  . T_ZNS gets the nameservers of the enclosing zone of a domain
 322
 323  . T_MXH gets the MX hostnames only (without their priorities)
 324
 325  . T_CSA gets the domain's Client SMTP Authorization SRV record
 326
 327 */
 328
 329 #define T_ZNS (-1)
 330 #define T_MXH (-2)
 331 #define T_CSA (-3)
 332
 333 /* The resolv.h header defines __P(x) on some Solaris 2.5.1 systems (without
 334 checking that it is already defined, in fact). This conflicts with other
 335 headers that behave likewise (see below), leading to compiler warnings. Arrange
 336 to undefine it if resolv.h defines it. */
 337
 338 #if defined(__P)
 339 #define __P_WAS_DEFINED_BEFORE_RESOLV
 340 #endif
 341
 342 #include <resolv.h>
 343
 344 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
 345 #undef __P
 346 #endif
 347
 348 /* These three are to support the IP option logging code. Linux is
 349 different to everyone else and there are also other systems which don't
 350 have netinet/ip_var.h, so there's a general macro to control its inclusion. */
 351
 352 #include <netinet/in_systm.h>
 353 #include <netinet/ip.h>
 354
 355 #ifndef NO_IP_VAR_H
 356 #include <netinet/ip_var.h>
 357 #endif
 358
 359 /* Linux (and some others) uses a different type for the 2nd argument of
 360 iconv(). It's os.h file defines ICONV_ARG2_TYPE. For the rest, define a default
 361 here. */
 362
 363 #ifndef ICONV_ARG2_TYPE
 364 #define ICONV_ARG2_TYPE const char **
 365 #endif
 366
 367 /* One OS uses a different type for the 5th argument of getsockopt */
 368
 369 #ifndef GETSOCKOPT_ARG5_TYPE
 370 #define GETSOCKOPT_ARG5_TYPE socklen_t *
 371 #endif
 372
 373 /* One operating system uses a different type for the 2nd argument of select().
 374 Its os.h file defines SELECT_ARG2_TYPE. For the rest, define a default here. */
 375
 376 #ifndef SELECT_ARG2_TYPE
 377 #define SELECT_ARG2_TYPE fd_set
 378 #endif
 379
 380 /* One operating system uses a different type for the 4th argument of
 381 dn_expand(). Its os.h file defines DN_EXPAND_ARG4_TYPE. For the rest, define a
 382 default here. */
 383
 384 #ifndef DN_EXPAND_ARG4_TYPE
 385 #define DN_EXPAND_ARG4_TYPE char *
 386 #endif
 387
 388 /* One operating system defines a different type for the yield of inet_addr().
 389 In Exim code, its value is always assigned to the s_addr members of address
 390 structures. Casting the yield to the type of s_addr should fix the problem,
 391 since the size of the data is correct. Just in case this ever has to be
 392 changed, use a macro for the type, and define it here so that it is possible to
 393 use different values for specific OS if ever necessary. */
 394
 395 #ifndef S_ADDR_TYPE
 396 #define S_ADDR_TYPE u_long
 397 #endif
 398
 399 /* (At least) one operating system (Solaris) defines a different type for the
 400 second argument of pam_converse() - the difference is the absence of "const".
 401 Its os.h file defines PAM_CONVERSE_ARG2_TYPE. For the rest, define a default
 402 here. */
 403
 404 #ifndef PAM_CONVERSE_ARG2_TYPE
 405 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
 406 #endif
 407
 408 /* One operating system (SunOS4) defines getc, ungetc, feof, and ferror as
 409 macros and not as functions. Exim needs them to be assignable functions. This
 410 flag gets set to cause this to be sorted out here. */
 411
 412 #ifdef FUDGE_GETC_AND_FRIENDS
 413 #undef getc
 414 extern int getc(FILE *);
 415 #undef ungetc
 416 extern int ungetc(int, FILE *);
 417 #undef feof
 418 extern int feof(FILE *);
 419 #undef ferror
 420 extern int ferror(FILE *);
 421 #endif
 422
 423 /* The header from the PCRE regex package */
 424
 425 #include "pcre/pcre.h"
 426
 427 /* Exim includes are in several files. Note that local_scan.h #includes
 428 config.h, mytypes.h, and store.h, so we don't need to mention them explicitly.
 429 */
 430
 431 #include "local_scan.h"
 432 #include "macros.h"
 433 #include "dbstuff.h"
 434 #include "structs.h"
 435 #include "globals.h"
 436 #include "functions.h"
 437 #include "dbfunctions.h"
 438 #include "osfunctions.h"
 439
 440 #ifdef EXPERIMENTAL_BRIGHTMAIL
 441 #include "bmi_spam.h"
 442 #endif
 443 #ifdef EXPERIMENTAL_SPF
 444 #include "spf.h"
 445 #endif
 446 #ifdef EXPERIMENTAL_SRS
 447 #include "srs.h"
 448 #endif
 449 #ifdef EXPERIMENTAL_DOMAINKEYS
 450 #include "dk.h"
 451 #endif
 452
 453 /* The following stuff must follow the inclusion of config.h because it
 454 requires various things that are set therein. */
 455
 456 #if HAVE_ICONV             /* Not all OS have this */
 457 #include <iconv.h>
 458 #endif
 459
 460 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC)
 461 #include <dlfcn.h>
 462 #endif
 463
 464 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
 465
 466 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
 467 #define LOOKUP_LSEARCH yes
 468 #endif
 469
 470 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
 471 simplifies some of the coding. */
 472
 473 union sockaddr_46 {
 474   struct sockaddr_in v4;
 475   #if HAVE_IPV6
 476   struct sockaddr_in6 v6;
 477   #endif
 478 };
 479
 480 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
 481 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
 482
 483 #ifndef SUPPORT_TLS
 484 #undef USE_GNUTLS
 485 #endif
 486
 487 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
 488 set them to the null string. */
 489
 490 #ifndef SPOOL_DIRECTORY
 491   #define SPOOL_DIRECTORY ""
 492 #endif
 493 #ifndef LOG_FILE_PATH
 494   #define LOG_FILE_PATH ""
 495 #endif
 496 #ifndef PID_FILE_PATH
 497   #define PID_FILE_PATH ""
 498 #endif
 499
 500 /* The EDQUOT error code isn't universally available, though it is widespread.
 501 There is a particular shambles in SunOS5, where it did not exist originally,
 502 but got installed with a particular patch for Solaris 2.4. There is a
 503 configuration variable for specifying what the system's "over quota" error is,
 504 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
 505 default to EDQUOT if it exists, otherwise ENOSPC. */
 506
 507 #ifndef ERRNO_QUOTA
 508 #ifdef  EDQUOT
 509 #define ERRNO_QUOTA EDQUOT
 510 #else
 511 #define ERRNO_QUOTA ENOSPC
 512 #endif
 513 #endif
 514
 515 /* Ensure PATH_MAX is defined */
 516
 517 #ifndef PATH_MAX
 518   #ifdef MAXPATHLEN
 519   #define PATH_MAX MAXPATHLEN
 520   #else
 521   #define PATH_MAX 1024
 522   #endif
 523 #endif
 524
 525
 526 /* End of exim.h */