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