1 /* $Cambridge: exim/src/src/exim.h,v 1.24 2008/01/16 13:44:45 nm4 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
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. */
16 /* Assume most systems have statfs() unless os.h undefines this macro */
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. */
25 /* If it didn't define os_find_running_interfaces, use the common function. */
27 #ifndef os_find_running_interfaces
28 #define os_find_running_interfaces os_common_find_running_interfaces
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. */
40 /* The maximum value of localhost_number depends on the base being used */
43 #define LOCALHOST_MAX 16
45 #define LOCALHOST_MAX 10
48 /* ANSI C standard includes */
64 #if defined(__svr4__) && defined(__sparc) && ! defined(__EXTENSIONS__)
65 #define __EXTENSIONS__ /* so that SunOS 5 gets NGROUPS_MAX */
72 /* Just in case some aged system doesn't define them... */
75 #define INT_MAX 2147483647
79 #define INT_MIN (-INT_MAX - 1)
83 #define SHRT_MAX 32767
90 /* Some systems have PATH_MAX and some have MAX_PATH_LEN. */
94 #define PATH_MAX MAX_PATH_LEN
100 #include <sys/types.h>
101 #include <sys/file.h>
111 /* Not all systems have flock() available. Those that do must define LOCK_SH
118 #ifndef NO_SYSEXITS /* some OS don't have this */
119 #include <sysexits.h>
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. */
126 #ifndef EXIM_SOCKLEN_T
127 #define EXIM_SOCKLEN_T socklen_t
130 /* Ensure that the sysexits we reference are defined */
132 #ifndef EX_UNAVAILABLE
133 #define EX_UNAVAILABLE 69 /* service unavailable; used for execv fail */
136 #define EX_CANTCREAT 73 /* can't create file: treat as temporary */
139 #define EX_TEMPFAIL 75 /* temp failure; user is invited to retry */
142 #define EX_CONFIG 78 /* configuration error */
145 /* This one is not in any sysexits file that I've come across */
147 #define EX_EXECFAILED 127 /* execve() failed */
150 #include <sys/time.h>
151 #include <sys/param.h>
153 #ifndef NO_SYS_RESOURCE_H /* QNX doesn't have this */
154 #include <sys/resource.h>
157 #include <sys/socket.h>
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. */
168 #include <sys/ioctl.h>
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.
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. */
182 #ifdef HAVE_SYS_STATVFS_H
183 #include <sys/statvfs.h>
184 #define STATVFS statvfs
185 #define F_FRSIZE f_frsize
187 #define STATVFS statfs
188 #define F_FRSIZE f_bsize
189 #ifdef HAVE_SYS_VFS_H
191 #ifdef HAVE_SYS_STATFS_H
192 #include <sys/statfs.h>
195 #ifdef HAVE_SYS_MOUNT_H
196 #include <sys/mount.h>
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
206 #define F_BAVAIL f_bavail
210 #define F_FAVAIL f_ffree
213 /* All the systems I've been able to look at seem to have F_FILES */
216 #define F_FILES f_files
222 #ifndef SIOCGIFCONF /* HACK for SunOS 5 */
223 #include <sys/sockio.h>
226 #include <sys/stat.h>
227 #include <sys/wait.h>
228 #include <sys/utsname.h>
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.] */
250 #include <netinet/in.h>
251 #include <netinet/tcp.h>
252 #include <arpa/inet.h>
253 #include <arpa/nameser.h>
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. */
260 #if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
261 #define MAXPACKET NS_PACKETSZ
262 #elif defined(PACKETSZ) && PACKETSZ >= 2048
263 #define MAXPACKET PACKETSZ
265 #define MAXPACKET 2048
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. */
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. */
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. */
319 /* We define a few private types for special DNS lookups:
321 . T_ZNS gets the nameservers of the enclosing zone of a domain
323 . T_MXH gets the MX hostnames only (without their priorities)
325 . T_CSA gets the domain's Client SMTP Authorization SRV record
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. */
339 #define __P_WAS_DEFINED_BEFORE_RESOLV
344 #if defined(__P) && ! defined (__P_WAS_DEFINED_BEFORE_RESOLV)
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. */
352 #include <netinet/in_systm.h>
353 #include <netinet/ip.h>
356 #include <netinet/ip_var.h>
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
363 #ifndef ICONV_ARG2_TYPE
364 #define ICONV_ARG2_TYPE const char **
367 /* One OS uses a different type for the 5th argument of getsockopt */
369 #ifndef GETSOCKOPT_ARG5_TYPE
370 #define GETSOCKOPT_ARG5_TYPE socklen_t *
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. */
376 #ifndef SELECT_ARG2_TYPE
377 #define SELECT_ARG2_TYPE fd_set
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
384 #ifndef DN_EXPAND_ARG4_TYPE
385 #define DN_EXPAND_ARG4_TYPE char *
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. */
396 #define S_ADDR_TYPE u_long
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
404 #ifndef PAM_CONVERSE_ARG2_TYPE
405 #define PAM_CONVERSE_ARG2_TYPE const struct pam_message
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. */
412 #ifdef FUDGE_GETC_AND_FRIENDS
414 extern int getc(FILE *);
416 extern int ungetc(int, FILE *);
418 extern int feof(FILE *);
420 extern int ferror(FILE *);
423 /* The header from the PCRE regex package */
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.
431 #include "local_scan.h"
436 #include "functions.h"
437 #include "dbfunctions.h"
438 #include "osfunctions.h"
440 #ifdef EXPERIMENTAL_BRIGHTMAIL
441 #include "bmi_spam.h"
443 #ifdef EXPERIMENTAL_SPF
446 #ifdef EXPERIMENTAL_SRS
449 #ifdef EXPERIMENTAL_DOMAINKEYS
452 #ifdef EXPERIMENTAL_DKIM
453 #include "dkim-exim.h"
456 /* The following stuff must follow the inclusion of config.h because it
457 requires various things that are set therein. */
459 #if HAVE_ICONV /* Not all OS have this */
463 #if defined(USE_READLINE) || defined(EXPAND_DLFUNC)
467 #ifdef ENABLE_DISABLE_FSYNC
468 #define EXIMfsync(f) (disable_fsync? 0 : fsync(f))
470 #define EXIMfsync(f) fsync(f)
473 /* Backward compatibility; LOOKUP_LSEARCH now includes all three */
475 #if (!defined LOOKUP_LSEARCH) && (defined LOOKUP_WILDLSEARCH || defined LOOKUP_NWILDLSEARCH)
476 #define LOOKUP_LSEARCH yes
479 /* Define a union to hold either an IPv4 or an IPv6 sockaddr structure; this
480 simplifies some of the coding. */
483 struct sockaddr_in v4;
485 struct sockaddr_in6 v6;
489 /* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
490 so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set. */
496 /* If SPOOL_DIRECTORY, LOG_FILE_PATH or PID_FILE_PATH have not been defined,
497 set them to the null string. */
499 #ifndef SPOOL_DIRECTORY
500 #define SPOOL_DIRECTORY ""
502 #ifndef LOG_FILE_PATH
503 #define LOG_FILE_PATH ""
505 #ifndef PID_FILE_PATH
506 #define PID_FILE_PATH ""
509 /* The EDQUOT error code isn't universally available, though it is widespread.
510 There is a particular shambles in SunOS5, where it did not exist originally,
511 but got installed with a particular patch for Solaris 2.4. There is a
512 configuration variable for specifying what the system's "over quota" error is,
513 which will end up in config.h if supplied in OS/Makefile-xxx. If it is not set,
514 default to EDQUOT if it exists, otherwise ENOSPC. */
518 #define ERRNO_QUOTA EDQUOT
520 #define ERRNO_QUOTA ENOSPC
524 /* Ensure PATH_MAX is defined */
528 #define PATH_MAX MAXPATHLEN
530 #define PATH_MAX 1024