src/src/exim.h

   1 /* $Cambridge: exim/src/src/exim.h,v 1.18 2005/08/22 10:49:04 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 <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 UCHAR_MAX
  79 #define UCHAR_MAX 255
  80 #endif
  81
  82 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
  83
  84 #ifndef PATH_MAX
  85 #ifdef MAX_PATH_LEN
  86 #define PATH_MAX MAX_PATH_LEN
  87 #else
  88 #define PATH_MAX 1024
  89 #endif
  90 #endif
  91
  92 #include <sys/types.h>
  93 #include <sys/file.h>
  94 #include <dirent.h>
  95 #include <netdb.h>
  96 #ifndef NO_POLL_H
  97 #include <poll.h>
  98 #endif
  99 #include <pwd.h>
 100 #include <grp.h>
 101 #include <syslog.h>
 102
 103 /* Not all systems have flock() available. Those that do must define LOCK_SH
 104 in sys/file.h. */
 105
 106 #ifndef LOCK_SH
 107 #define NO_FLOCK
 108 #endif
 109
 110 #ifndef NO_SYSEXITS        /* some OS don't have this */
 111 #include <sysexits.h>
 112 #endif
 113
 114 /* A few OS don't have socklen_t; their os.h files define EXIM_SOCKLEN_T to
 115 be size_t or whatever. We used to use SOCKLEN_T, but then it was discovered
 116 that this is used by the AIX include files. */
 117
 118 #ifndef EXIM_SOCKLEN_T
 119 #define EXIM_SOCKLEN_T socklen_t
 120 #endif
 121
 122 /* Ensure that the sysexits we reference are defined */
 123
 124 #ifndef EX_UNAVAILABLE
 125 #define EX_UNAVAILABLE 69        /* service unavailable; used for execv fail */
 126 #endif
 127 #ifndef EX_CANTCREAT
 128 #define EX_CANTCREAT   73        /* can't create file: treat as temporary */
 129 #endif
 130 #ifndef EX_TEMPFAIL
 131 #define EX_TEMPFAIL    75        /* temp failure; user is invited to retry */
 132 #endif
 133 #ifndef EX_CONFIG
 134 #define EX_CONFIG      78        /* configuration error */
 135 #endif
 136
 137 /* This one is not in any sysexits file that I've come across */
 138
 139 #define EX_EXECFAILED 127        /* execve() failed */
 140
 141
 142 #include <sys/time.h>
 143 #include <sys/param.h>
 144
 145 #ifndef NO_SYS_RESOURCE_H  /* QNX doesn't have this */
 146 #include <sys/resource.h>
 147 #endif
 148
 149 #include <sys/socket.h>
 150
 151 /* If we are on an IPv6 system, the macro AF_INET6 will have been defined in
 152 the sys/socket.h header. It is helpful to have this defined on an IPv4 system
 153 so that it can appear in the code, even if it is never actually used when
 154 the code is run. It saves some #ifdef occurrences. */
 155
 156 #ifndef AF_INET6
 157 #define AF_INET6 24
 158 #endif
 159
 160 #include <sys/ioctl.h>
 161
 162 /* The new standard is statvfs; some OS have statfs. For statvfs the block
 163 counts must be multiplied by the "fragment size" f_frsize to get the actual
 164 size. In other cases the value seems to be f_bsize (which is sometimes the only
 165 block size), so we use a macro to get that instead.
 166
 167 Also arrange to be able to cut it out altogether for way-out OS that don't have
 168 anything. I've indented a bit here to try to make the mess a bit more
 169 intelligible. Note that simply defining one name to be another when
 170 HAVE_SYS_STATVFS_H is not set will not work if the system has a statvfs macro
 171 or a macro with entries f_frsize and f_bsize. */
 172
 173 #ifdef HAVE_STATFS
 174   #ifdef HAVE_SYS_STATVFS_H
 175     #include <sys/statvfs.h>
 176     #define STATVFS statvfs
 177     #define F_FRSIZE f_frsize
 178   #else
 179     #define STATVFS statfs
 180     #define F_FRSIZE f_bsize
 181     #ifdef HAVE_SYS_VFS_H
 182       #include <sys/vfs.h>
 183       #ifdef HAVE_SYS_STATFS_H
 184       #include <sys/statfs.h>
 185       #endif
 186     #endif
 187     #ifdef HAVE_SYS_MOUNT_H
 188     #include <sys/mount.h>
 189     #endif
 190   #endif
 191
 192   /* Macros for the fields for the available space for non-superusers; define
 193   these only if the OS header has not. Not all OS have f_favail; those that
 194   are known to have it define F_FAVAIL as f_favail. The default is to use
 195   f_free. */
 196
 197   #ifndef F_BAVAIL
 198   #define F_BAVAIL f_bavail
 199   #endif
 200
 201   #ifndef F_FAVAIL
 202   #define F_FAVAIL f_ffree
 203   #endif
 204
 205   /* All the systems I've been able to look at seem to have F_FILES */
 206
 207   #ifndef F_FILES
 208   #define F_FILES  f_files
 209   #endif
 210
 211 #endif
 212
 213
 214 #ifndef  SIOCGIFCONF   /* HACK for SunOS 5 */
 215 #include <sys/sockio.h>
 216 #endif
 217
 218 #include <sys/stat.h>
 219 #include <sys/wait.h>
 220 #include <sys/utsname.h>
 221 #include <fcntl.h>
 222
 223 /* There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
 224 with the definition in sysexits.h. Exim does not actually use this macro, so we
 225 just undefine it. It would be nice to be able to re-instate the definition from
 226 sysexits.h if there is no definition in unistd.h, but I do not think there is a
 227 way to do this in C because macro definitions are not scanned for other macros
 228 at definition time. [The code here used to assume they were, until I was
 229 disabused of the notion. Luckily, since EX_OK is not used, it didn't matter.] */
 230
 231 #ifdef EX_OK
 232 #undef EX_OK
 233 #endif
 234
 235 #include <unistd.h>
 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 /* It seems that some versions of arpa/nameser.h don't define *any* of the
 283 T_xxx macros, which seem to be non-standard nowadays. Just to be on the safe
 284 side, put in definitions for all the ones that Exim uses. */
 285
 286 #ifndef T_A
 287 #define T_A 1
 288 #endif
 289
 290 #ifndef T_CNAME
 291 #define T_CNAME 5
 292 #endif
 293
 294 #ifndef T_SOA
 295 #define T_SOA 6
 296 #endif
 297
 298 #ifndef T_MX
 299 #define T_MX 15
 300 #endif
 301
 302 #ifndef T_NS
 303 #define T_NS 2
 304 #endif
 305
 306 #ifndef T_PTR
 307 #define T_PTR 12
 308 #endif
 309
 310
 311 /* We define a few private types for special DNS lookups:
 312
 313  . T_ZNS gets the nameservers of the enclosing zone of a domain
 314
 315  . T_MXH gets the MX hostnames only (without their priorities)
 316
 317  . T_CSA gets the domain's Client SMTP Authorization SRV record
 318
 319 */
 320
 321 #define T_ZNS (-1)
 322 #define T_MXH (-2)
 323 #define T_CSA (-3)
 324
 325 /* The resolv.h header defines __P(x) on some Solaris 2.5.1 systems (without
 326 checking that it is already defined, in fact). This conflicts with other
 327 headers that behave likewise (see below), leading to compiler warnings. Arrange
 328 to undefine it if resolv.h defines it. */
 329
 330 #if defined(__P)
 331 #define __P_WAS_DEFINED_BEFORE_RESOLV
 332 #endif
 333
 334 #include <resolv.h>
 335
 336 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
 337 #undef __P
 338 #endif
 339
 340 /* These three are to support the IP option logging code. Linux is
 341 different to everyone else and there are also other systems which don't
 342 have netinet/ip_var.h, so there's a general macro to control its inclusion. */
 343
 344 #include <netinet/in_systm.h>
 345 #include <netinet/ip.h>
 346
 347 #ifndef NO_IP_VAR_H
 348 #include <netinet/ip_var.h>
 349 #endif
 350
 351 /* Linux (and some others) uses a different type for the 2nd argument of
 352 iconv(). It's os.h file defines ICONV_ARG2_TYPE. For the rest, define a default
 353 here. */
 354
 355 #ifndef ICONV_ARG2_TYPE
 356 #define ICONV_ARG2_TYPE const char **
 357 #endif
 358
 359 /* One OS uses a different type for the 5th argument of getsockopt */
 360
 361 #ifndef GETSOCKOPT_ARG5_TYPE
 362 #define GETSOCKOPT_ARG5_TYPE socklen_t *
 363 #endif
 364
 365 /* One operating system uses a different type for the 2nd argument of select().
 366 Its os.h file defines SELECT_ARG2_TYPE. For the rest, define a default here. */
 367
 368 #ifndef SELECT_ARG2_TYPE
 369 #define SELECT_ARG2_TYPE fd_set
 370 #endif
 371
 372 /* One operating system uses a different type for the 4th argument of
 373 dn_expand(). Its os.h file defines DN_EXPAND_ARG4_TYPE. For the rest, define a
 374 default here. */
 375
 376 #ifndef DN_EXPAND_ARG4_TYPE
 377 #define DN_EXPAND_ARG4_TYPE char *
 378 #endif
 379
 380 /* One operating system defines a different type for the yield of inet_addr().
 381 In Exim code, its value is always assigned to the s_addr members of address
 382 structures. Casting the yield to the type of s_addr should fix the problem,
 383 since the size of the data is correct. Just in case this ever has to be
 384 changed, use a macro for the type, and define it here so that it is possible to
 385 use different values for specific OS if ever necessary. */
 386
 387 #ifndef S_ADDR_TYPE
 388 #define S_ADDR_TYPE u_long
 389 #endif
 390
 391 /* (At least) one operating system (Solaris) defines a different type for the
 392 second argument of pam_converse() - the difference is the absence of "const".
 393 Its os.h file defines PAM_CONVERSE_ARG2_TYPE. For the rest, define a default
 394 here. */
 395
 396 #ifndef PAM_CONVERSE_ARG2_TYPE
 397 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
 398 #endif
 399
 400 /* One operating system (SunOS4) defines getc, ungetc, feof, and ferror as
 401 macros and not as functions. Exim needs them to be assignable functions. This
 402 flag gets set to cause this to be sorted out here. */
 403
 404 #ifdef FUDGE_GETC_AND_FRIENDS
 405 #undef getc
 406 extern int getc(FILE *);
 407 #undef ungetc
 408 extern int ungetc(int, FILE *);
 409 #undef feof
 410 extern int feof(FILE *);
 411 #undef ferror
 412 extern int ferror(FILE *);
 413 #endif
 414
 415 /* The header from the PCRE regex package */
 416
 417 #include "pcre/pcre.h"
 418
 419 /* Exim includes are in several files. Note that local_scan.h #includes
 420 config.h, mytypes.h, and store.h, so we don't need to mention them explicitly.
 421 */
 422
 423 #include "local_scan.h"
 424 #include "macros.h"
 425 #include "dbstuff.h"
 426 #include "structs.h"
 427 #include "globals.h"
 428 #include "functions.h"
 429 #include "dbfunctions.h"
 430 #include "osfunctions.h"
 431
 432 #ifdef EXPERIMENTAL_BRIGHTMAIL
 433 #include "bmi_spam.h"
 434 #endif
 435 #ifdef EXPERIMENTAL_SPF
 436 #include "spf.h"
 437 #endif
 438 #ifdef EXPERIMENTAL_SRS
 439 #include "srs.h"
 440 #endif
 441 #ifdef EXPERIMENTAL_DOMAINKEYS
 442 #include "dk.h"
 443 #endif
 444
 445 /* The following stuff must follow the inclusion of config.h because it
 446 requires various things that are set therein. */
 447
 448 #if HAVE_ICONV             /* Not all OS have this */
 449 #include <iconv.h>
 450 #endif
 451
 452 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC)
 453 #include <dlfcn.h>
 454 #endif
 455
 456 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
 457
 458 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
 459 #define LOOKUP_LSEARCH yes
 460 #endif
 461
 462 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
 463 simplifies some of the coding. */
 464
 465 union sockaddr_46 {
 466   struct sockaddr_in v4;
 467   #if HAVE_IPV6
 468   struct sockaddr_in6 v6;
 469   #endif
 470 };
 471
 472 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
 473 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
 474
 475 #ifndef SUPPORT_TLS
 476 #undef USE_GNUTLS
 477 #endif
 478
 479 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
 480 set them to the null string. */
 481
 482 #ifndef SPOOL_DIRECTORY
 483   #define SPOOL_DIRECTORY ""
 484 #endif
 485 #ifndef LOG_FILE_PATH
 486   #define LOG_FILE_PATH ""
 487 #endif
 488 #ifndef PID_FILE_PATH
 489   #define PID_FILE_PATH ""
 490 #endif
 491
 492 /* The EDQUOT error code isn't universally available, though it is widespread.
 493 There is a particular shambles in SunOS5, where it did not exist originally,
 494 but got installed with a particular patch for Solaris 2.4. There is a
 495 configuration variable for specifying what the system's "over quota" error is,
 496 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
 497 default to EDQUOT if it exists, otherwise ENOSPC. */
 498
 499 #ifndef ERRNO_QUOTA
 500 #ifdef  EDQUOT
 501 #define ERRNO_QUOTA EDQUOT
 502 #else
 503 #define ERRNO_QUOTA ENOSPC
 504 #endif
 505 #endif
 506
 507 /* Ensure PATH_MAX is defined */
 508
 509 #ifndef PATH_MAX
 510   #ifdef MAXPATHLEN
 511   #define PATH_MAX MAXPATHLEN
 512   #else
 513   #define PATH_MAX 1024
 514   #endif
 515 #endif
 516
 517
 518 /* End of exim.h */