src/src/exim.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2012 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 /* Source files for exim all #include this header, which drags in everything
  10 that is needed. They don't all need everything, of course, but it's far too
  11 messy to have each one importing its own list, and anyway, most of them need
  12 most of these includes. */
  13
  14 /* Assume most systems have statfs() unless os.h undefines this macro */
  15
  16 #define HAVE_STATFS
  17
  18 /* Similarly, assume most systems have srandom() unless os.h undefines it.
  19 This call dates back at least as far as SUSv2. */
  20
  21 #define HAVE_SRANDOM
  22
  23 /* This is primarily for the Gnu C library; we define it before os.h so that
  24 os.h has a chance to hurriedly undef it, Just In Case.  We need C99 for some
  25 64-bit math support, and defining _ISOC99_SOURCE breaks <resolv.h> and friends.
  26 */
  27
  28 #define _GNU_SOURCE 1
  29
  30 /* First of all include the os-specific header, which might set things that
  31 are needed by any of the other headers, including system headers. */
  32
  33 #include "os.h"
  34
  35 /* If it didn't define os_find_running_interfaces, use the common function. */
  36
  37 #ifndef os_find_running_interfaces
  38 #define os_find_running_interfaces os_common_find_running_interfaces
  39 #endif
  40
  41 /* If it didn't define the base for "base 62" numbers, we really do use 62.
  42 This is the case for all real Unix and Unix-like OS. It's only Cygwin and
  43 Darwin, with their case-insensitive file systems, that can't use base 62 for
  44 making unique names. */
  45
  46 #ifndef BASE_62
  47 #define BASE_62 62
  48 #endif
  49
  50 /* The maximum value of localhost_number depends on the base being used */
  51
  52 #if BASE_62 == 62
  53 #define LOCALHOST_MAX  16
  54 #else
  55 #define LOCALHOST_MAX  10
  56 #endif
  57
  58 /* If not overriden by os.h, dynamic libraries have filenames ending .so */
  59 #ifndef DYNLIB_FN_EXT
  60 # define DYNLIB_FN_EXT "so"
  61 #endif
  62
  63 /* ANSI C standard includes */
  64
  65 #include <ctype.h>
  66 #include <locale.h>
  67 #include <math.h>
  68 #include <signal.h>
  69 #include <stdarg.h>
  70 #include <stddef.h>
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #include <time.h>
  75
  76 /* Unix includes */
  77
  78 #include <errno.h>
  79 #if defined(__svr4__) && defined(__sparc) && ! defined(__EXTENSIONS__)
  80 #define __EXTENSIONS__  /* so that SunOS 5 gets NGROUPS_MAX */
  81 #include <limits.h>
  82 #undef  __EXTENSIONS__
  83 #else
  84 #include <limits.h>
  85 #endif
  86
  87 /* C99 integer types, figure out how to undo this if needed for older systems */
  88
  89 #include <inttypes.h>
  90
  91 /* Just in case some aged system doesn't define them... */
  92
  93 #ifndef INT_MAX
  94 #define INT_MAX 2147483647
  95 #endif
  96
  97 #ifndef INT_MIN
  98 #define INT_MIN (-INT_MAX - 1)
  99 #endif
 100
 101 #ifndef SHRT_MAX
 102 #define SHRT_MAX 32767
 103 #endif
 104
 105 #ifndef UCHAR_MAX
 106 #define UCHAR_MAX 255
 107 #endif
 108
 109 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
 110
 111 #ifndef PATH_MAX
 112 #ifdef MAX_PATH_LEN
 113 #define PATH_MAX MAX_PATH_LEN
 114 #else
 115 #define PATH_MAX 1024
 116 #endif
 117 #endif
 118
 119 #include <sys/types.h>
 120 #include <sys/file.h>
 121 #include <dirent.h>
 122 #include <netdb.h>
 123 #ifndef NO_POLL_H
 124 #include <poll.h>
 125 #endif
 126 #include <pwd.h>
 127 #include <grp.h>
 128 #include <syslog.h>
 129
 130 /* Not all systems have flock() available. Those that do must define LOCK_SH
 131 in sys/file.h. */
 132
 133 #ifndef LOCK_SH
 134 #define NO_FLOCK
 135 #endif
 136
 137 #ifndef NO_SYSEXITS        /* some OS don't have this */
 138 #include <sysexits.h>
 139 #endif
 140
 141 /* A few OS don't have socklen_t; their os.h files define EXIM_SOCKLEN_T to
 142 be size_t or whatever. We used to use SOCKLEN_T, but then it was discovered
 143 that this is used by the AIX include files. */
 144
 145 #ifndef EXIM_SOCKLEN_T
 146 #define EXIM_SOCKLEN_T socklen_t
 147 #endif
 148
 149 /* Ensure that the sysexits we reference are defined */
 150
 151 #ifndef EX_UNAVAILABLE
 152 #define EX_UNAVAILABLE 69        /* service unavailable; used for execv fail */
 153 #endif
 154 #ifndef EX_CANTCREAT
 155 #define EX_CANTCREAT   73        /* can't create file: treat as temporary */
 156 #endif
 157 #ifndef EX_TEMPFAIL
 158 #define EX_TEMPFAIL    75        /* temp failure; user is invited to retry */
 159 #endif
 160 #ifndef EX_CONFIG
 161 #define EX_CONFIG      78        /* configuration error */
 162 #endif
 163
 164 /* This one is not in any sysexits file that I've come across */
 165
 166 #define EX_EXECFAILED 127        /* execve() failed */
 167
 168
 169 #include <sys/time.h>
 170 #include <sys/param.h>
 171
 172 #ifndef NO_SYS_RESOURCE_H  /* QNX doesn't have this */
 173 #include <sys/resource.h>
 174 #endif
 175
 176 #include <sys/socket.h>
 177
 178 /* If we are on an IPv6 system, the macro AF_INET6 will have been defined in
 179 the sys/socket.h header. It is helpful to have this defined on an IPv4 system
 180 so that it can appear in the code, even if it is never actually used when
 181 the code is run. It saves some #ifdef occurrences. */
 182
 183 #ifndef AF_INET6
 184 #define AF_INET6 24
 185 #endif
 186
 187 #include <sys/ioctl.h>
 188
 189 /* The new standard is statvfs; some OS have statfs. For statvfs the block
 190 counts must be multiplied by the "fragment size" f_frsize to get the actual
 191 size. In other cases the value seems to be f_bsize (which is sometimes the only
 192 block size), so we use a macro to get that instead.
 193
 194 Also arrange to be able to cut it out altogether for way-out OS that don't have
 195 anything. I've indented a bit here to try to make the mess a bit more
 196 intelligible. Note that simply defining one name to be another when
 197 HAVE_SYS_STATVFS_H is not set will not work if the system has a statvfs macro
 198 or a macro with entries f_frsize and f_bsize. */
 199
 200 #ifdef HAVE_STATFS
 201   #ifdef HAVE_SYS_STATVFS_H
 202     #include <sys/statvfs.h>
 203     #define STATVFS statvfs
 204     #define F_FRSIZE f_frsize
 205   #else
 206     #define STATVFS statfs
 207     #define F_FRSIZE f_bsize
 208     #ifdef HAVE_SYS_VFS_H
 209       #include <sys/vfs.h>
 210       #ifdef HAVE_SYS_STATFS_H
 211       #include <sys/statfs.h>
 212       #endif
 213     #endif
 214     #ifdef HAVE_SYS_MOUNT_H
 215     #include <sys/mount.h>
 216     #endif
 217   #endif
 218
 219   /* Macros for the fields for the available space for non-superusers; define
 220   these only if the OS header has not. Not all OS have f_favail; those that
 221   are known to have it define F_FAVAIL as f_favail. The default is to use
 222   f_free. */
 223
 224   #ifndef F_BAVAIL
 225   #define F_BAVAIL f_bavail
 226   #endif
 227
 228   #ifndef F_FAVAIL
 229   #define F_FAVAIL f_ffree
 230   #endif
 231
 232   /* All the systems I've been able to look at seem to have F_FILES */
 233
 234   #ifndef F_FILES
 235   #define F_FILES  f_files
 236   #endif
 237
 238 #endif
 239
 240
 241 #ifndef  SIOCGIFCONF   /* HACK for SunOS 5 */
 242 #include <sys/sockio.h>
 243 #endif
 244
 245 #include <sys/stat.h>
 246 #include <sys/wait.h>
 247 #include <sys/utsname.h>
 248 #include <fcntl.h>
 249
 250 /* There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
 251 with the definition in sysexits.h. Exim does not actually use this macro, so we
 252 just undefine it. It would be nice to be able to re-instate the definition from
 253 sysexits.h if there is no definition in unistd.h, but I do not think there is a
 254 way to do this in C because macro definitions are not scanned for other macros
 255 at definition time. [The code here used to assume they were, until I was
 256 disabused of the notion. Luckily, since EX_OK is not used, it didn't matter.] */
 257
 258 #ifdef EX_OK
 259 #undef EX_OK
 260 #endif
 261
 262 #include <unistd.h>
 263
 264 #include <utime.h>
 265 #ifndef NO_NET_IF_H
 266 #include <net/if.h>
 267 #endif
 268 #include <sys/un.h>
 269 #include <netinet/in.h>
 270 #include <netinet/tcp.h>
 271 #include <arpa/inet.h>
 272 #include <arpa/nameser.h>
 273
 274
 275 /* If arpa/nameser.h defines a maximum name server packet size, use it,
 276 provided it is greater than 2048. Otherwise go for a default. PACKETSZ was used
 277 for this, but it seems that NS_PACKETSZ is coming into use. */
 278
 279 #if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
 280   #define MAXPACKET NS_PACKETSZ
 281 #elif defined(PACKETSZ) && PACKETSZ >= 2048
 282   #define MAXPACKET PACKETSZ
 283 #else
 284   #define MAXPACKET 2048
 285 #endif
 286
 287 /* While IPv6 is still young the definitions of T_AAAA and T_A6 may not be
 288 included in arpa/nameser.h. Fudge them here. */
 289
 290 #ifndef T_AAAA
 291 #define T_AAAA 28
 292 #endif
 293
 294 #ifndef T_A6
 295 #define T_A6 38
 296 #endif
 297
 298 /* Ancient systems (e.g. SunOS4) don't appear to have T_TXT defined in their
 299 header files. I don't suppose they have T_SRV either. */
 300
 301 #ifndef T_TXT
 302 #define T_TXT 16
 303 #endif
 304
 305 #ifndef T_SRV
 306 #define T_SRV 33
 307 #endif
 308
 309 /* Many systems do not have T_SPF. */
 310
 311 #ifndef T_SPF
 312 #define T_SPF 99
 313 #endif
 314
 315 /* It seems that some versions of arpa/nameser.h don't define *any* of the
 316 T_xxx macros, which seem to be non-standard nowadays. Just to be on the safe
 317 side, put in definitions for all the ones that Exim uses. */
 318
 319 #ifndef T_A
 320 #define T_A 1
 321 #endif
 322
 323 #ifndef T_CNAME
 324 #define T_CNAME 5
 325 #endif
 326
 327 #ifndef T_SOA
 328 #define T_SOA 6
 329 #endif
 330
 331 #ifndef T_MX
 332 #define T_MX 15
 333 #endif
 334
 335 #ifndef T_NS
 336 #define T_NS 2
 337 #endif
 338
 339 #ifndef T_PTR
 340 #define T_PTR 12
 341 #endif
 342
 343
 344 /* We define a few private types for special DNS lookups:
 345
 346  . T_ZNS gets the nameservers of the enclosing zone of a domain
 347
 348  . T_MXH gets the MX hostnames only (without their priorities)
 349
 350  . T_CSA gets the domain's Client SMTP Authorization SRV record
 351
 352 */
 353
 354 #define T_ZNS (-1)
 355 #define T_MXH (-2)
 356 #define T_CSA (-3)
 357
 358 /* The resolv.h header defines __P(x) on some Solaris 2.5.1 systems (without
 359 checking that it is already defined, in fact). This conflicts with other
 360 headers that behave likewise (see below), leading to compiler warnings. Arrange
 361 to undefine it if resolv.h defines it. */
 362
 363 #if defined(__P)
 364 #define __P_WAS_DEFINED_BEFORE_RESOLV
 365 #endif
 366
 367 #include <resolv.h>
 368
 369 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
 370 #undef __P
 371 #endif
 372
 373 /* If not defined by os.h, we do nothing special to push DNS resolver state
 374 back to be available by the classic resolver routines.  Also, provide
 375 prototype for our get routine, unless defined away. */
 376
 377 #ifndef os_put_dns_resolver_res
 378 # define os_put_dns_resolver_res(R) do {/**/} while(0)
 379 #endif
 380 #ifndef os_get_dns_resolver_res
 381 res_state os_get_dns_resolver_res(void);
 382 #endif
 383
 384 /* These three are to support the IP option logging code. Linux is
 385 different to everyone else and there are also other systems which don't
 386 have netinet/ip_var.h, so there's a general macro to control its inclusion. */
 387
 388 #include <netinet/in_systm.h>
 389 #include <netinet/ip.h>
 390
 391 #ifndef NO_IP_VAR_H
 392 #include <netinet/ip_var.h>
 393 #endif
 394
 395 /* Linux (and some others) uses a different type for the 2nd argument of
 396 iconv(). It's os.h file defines ICONV_ARG2_TYPE. For the rest, define a default
 397 here. */
 398
 399 #ifndef ICONV_ARG2_TYPE
 400 #define ICONV_ARG2_TYPE const char **
 401 #endif
 402
 403 /* One OS uses a different type for the 5th argument of getsockopt */
 404
 405 #ifndef GETSOCKOPT_ARG5_TYPE
 406 #define GETSOCKOPT_ARG5_TYPE socklen_t *
 407 #endif
 408
 409 /* One operating system uses a different type for the 2nd argument of select().
 410 Its os.h file defines SELECT_ARG2_TYPE. For the rest, define a default here. */
 411
 412 #ifndef SELECT_ARG2_TYPE
 413 #define SELECT_ARG2_TYPE fd_set
 414 #endif
 415
 416 /* One operating system uses a different type for the 4th argument of
 417 dn_expand(). Its os.h file defines DN_EXPAND_ARG4_TYPE. For the rest, define a
 418 default here. */
 419
 420 #ifndef DN_EXPAND_ARG4_TYPE
 421 #define DN_EXPAND_ARG4_TYPE char *
 422 #endif
 423
 424 /* One operating system defines a different type for the yield of inet_addr().
 425 In Exim code, its value is always assigned to the s_addr members of address
 426 structures. Casting the yield to the type of s_addr should fix the problem,
 427 since the size of the data is correct. Just in case this ever has to be
 428 changed, use a macro for the type, and define it here so that it is possible to
 429 use different values for specific OS if ever necessary. */
 430
 431 #ifndef S_ADDR_TYPE
 432 #define S_ADDR_TYPE u_long
 433 #endif
 434
 435 /* (At least) one operating system (Solaris) defines a different type for the
 436 second argument of pam_converse() - the difference is the absence of "const".
 437 Its os.h file defines PAM_CONVERSE_ARG2_TYPE. For the rest, define a default
 438 here. */
 439
 440 #ifndef PAM_CONVERSE_ARG2_TYPE
 441 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
 442 #endif
 443
 444 /* One operating system (SunOS4) defines getc, ungetc, feof, and ferror as
 445 macros and not as functions. Exim needs them to be assignable functions. This
 446 flag gets set to cause this to be sorted out here. */
 447
 448 #ifdef FUDGE_GETC_AND_FRIENDS
 449 #undef getc
 450 extern int getc(FILE *);
 451 #undef ungetc
 452 extern int ungetc(int, FILE *);
 453 #undef feof
 454 extern int feof(FILE *);
 455 #undef ferror
 456 extern int ferror(FILE *);
 457 #endif
 458
 459 /* The header from the PCRE regex package */
 460
 461 #include <pcre.h>
 462
 463 /* Exim includes are in several files. Note that local_scan.h #includes
 464 config.h, mytypes.h, and store.h, so we don't need to mention them explicitly.
 465 */
 466
 467 #include "local_scan.h"
 468 #include "macros.h"
 469 #include "dbstuff.h"
 470 #include "structs.h"
 471 #include "globals.h"
 472 #include "functions.h"
 473 #include "dbfunctions.h"
 474 #include "osfunctions.h"
 475
 476 #ifdef EXPERIMENTAL_BRIGHTMAIL
 477 #include "bmi_spam.h"
 478 #endif
 479 #ifdef EXPERIMENTAL_SPF
 480 #include "spf.h"
 481 #endif
 482 #ifdef EXPERIMENTAL_SRS
 483 #include "srs.h"
 484 #endif
 485 #ifndef DISABLE_DKIM
 486 #include "dkim.h"
 487 #endif
 488
 489 /* The following stuff must follow the inclusion of config.h because it
 490 requires various things that are set therein. */
 491
 492 #if HAVE_ICONV             /* Not all OS have this */
 493 #include <iconv.h>
 494 #endif
 495
 496 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC) || defined (LOOKUP_MODULE_DIR)
 497 #include <dlfcn.h>
 498 #endif
 499
 500 #ifdef ENABLE_DISABLE_FSYNC
 501 #define EXIMfsync(f) (disable_fsync? 0 : fsync(f))
 502 #else
 503 #define EXIMfsync(f) fsync(f)
 504 #endif
 505
 506 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
 507
 508 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
 509 #define LOOKUP_LSEARCH yes
 510 #endif
 511
 512 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
 513 simplifies some of the coding.  We include the sockaddr to reduce type-punning
 514 issues in C99. */
 515
 516 union sockaddr_46 {
 517   struct sockaddr_in v4;
 518   #if HAVE_IPV6
 519   struct sockaddr_in6 v6;
 520   #endif
 521   struct sockaddr v0;
 522 };
 523
 524 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
 525 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
 526
 527 #ifndef SUPPORT_TLS
 528 #undef USE_GNUTLS
 529 #endif
 530
 531 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
 532 set them to the null string. */
 533
 534 #ifndef SPOOL_DIRECTORY
 535   #define SPOOL_DIRECTORY ""
 536 #endif
 537 #ifndef LOG_FILE_PATH
 538   #define LOG_FILE_PATH ""
 539 #endif
 540 #ifndef PID_FILE_PATH
 541   #define PID_FILE_PATH ""
 542 #endif
 543
 544 /* The EDQUOT error code isn't universally available, though it is widespread.
 545 There is a particular shambles in SunOS5, where it did not exist originally,
 546 but got installed with a particular patch for Solaris 2.4. There is a
 547 configuration variable for specifying what the system's "over quota" error is,
 548 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
 549 default to EDQUOT if it exists, otherwise ENOSPC. */
 550
 551 #ifndef ERRNO_QUOTA
 552 #ifdef  EDQUOT
 553 #define ERRNO_QUOTA EDQUOT
 554 #else
 555 #define ERRNO_QUOTA ENOSPC
 556 #endif
 557 #endif
 558
 559 /* Ensure PATH_MAX is defined */
 560
 561 #ifndef PATH_MAX
 562   #ifdef MAXPATHLEN
 563   #define PATH_MAX MAXPATHLEN
 564   #else
 565   #define PATH_MAX 1024
 566   #endif
 567 #endif
 568
 569 /* End of exim.h */