1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 * 8 * @(#)sendmail.h 8.54 (Berkeley) 08/08/94 9 */ 10 11 /* 12 ** SENDMAIL.H -- Global definitions for sendmail. 13 */ 14 15 # ifdef _DEFINE 16 # define EXTERN 17 # ifndef lint 18 static char SmailSccsId[] = "@(#)sendmail.h 8.54 08/08/94"; 19 # endif 20 # else /* _DEFINE */ 21 # define EXTERN extern 22 # endif /* _DEFINE */ 23 24 # include <unistd.h> 25 # include <stddef.h> 26 # include <stdlib.h> 27 # include <stdio.h> 28 # include <ctype.h> 29 # include <setjmp.h> 30 # include <sysexits.h> 31 # include <string.h> 32 # include <time.h> 33 # include <errno.h> 34 35 # include "conf.h" 36 # include "useful.h" 37 38 # ifdef LOG 39 # include <syslog.h> 40 # endif /* LOG */ 41 42 # ifdef DAEMON 43 # include <sys/socket.h> 44 # endif 45 # ifdef NETUNIX 46 # include <sys/un.h> 47 # endif 48 # ifdef NETINET 49 # include <netinet/in.h> 50 # endif 51 # ifdef NETISO 52 # include <netiso/iso.h> 53 # endif 54 # ifdef NETNS 55 # include <netns/ns.h> 56 # endif 57 # ifdef NETX25 58 # include <netccitt/x25.h> 59 # endif 60 61 62 63 64 /* 65 ** Data structure for bit maps. 66 ** 67 ** Each bit in this map can be referenced by an ascii character. 68 ** This is 256 possible bits, or 32 8-bit bytes. 69 */ 70 71 #define BITMAPBYTES 32 /* number of bytes in a bit map */ 72 #define BYTEBITS 8 /* number of bits in a byte */ 73 74 /* internal macros */ 75 #define _BITWORD(bit) (bit / (BYTEBITS * sizeof (int))) 76 #define _BITBIT(bit) (1 << (bit % (BYTEBITS * sizeof (int)))) 77 78 typedef int BITMAP[BITMAPBYTES / sizeof (int)]; 79 80 /* test bit number N */ 81 #define bitnset(bit, map) ((map)[_BITWORD(bit)] & _BITBIT(bit)) 82 83 /* set bit number N */ 84 #define setbitn(bit, map) (map)[_BITWORD(bit)] |= _BITBIT(bit) 85 86 /* clear bit number N */ 87 #define clrbitn(bit, map) (map)[_BITWORD(bit)] &= ~_BITBIT(bit) 88 89 /* clear an entire bit map */ 90 #define clrbitmap(map) bzero((char *) map, BITMAPBYTES) 91 /* 92 ** Address structure. 93 ** Addresses are stored internally in this structure. 94 */ 95 96 struct address 97 { 98 char *q_paddr; /* the printname for the address */ 99 char *q_user; /* user name */ 100 char *q_ruser; /* real user name, or NULL if q_user */ 101 char *q_host; /* host name */ 102 struct mailer *q_mailer; /* mailer to use */ 103 u_short q_flags; /* status flags, see below */ 104 uid_t q_uid; /* user-id of receiver (if known) */ 105 gid_t q_gid; /* group-id of receiver (if known) */ 106 char *q_home; /* home dir (local mailer only) */ 107 char *q_fullname; /* full name if known */ 108 struct address *q_next; /* chain */ 109 struct address *q_alias; /* address this results from */ 110 char *q_owner; /* owner of q_alias */ 111 struct address *q_tchain; /* temporary use chain */ 112 time_t q_timeout; /* timeout for this address */ 113 }; 114 115 typedef struct address ADDRESS; 116 117 # define QDONTSEND 000001 /* don't send to this address */ 118 # define QBADADDR 000002 /* this address is verified bad */ 119 # define QGOODUID 000004 /* the q_uid q_gid fields are good */ 120 # define QPRIMARY 000010 /* set from argv */ 121 # define QQUEUEUP 000020 /* queue for later transmission */ 122 # define QSENT 000040 /* has been successfully delivered */ 123 # define QNOTREMOTE 000100 /* not an address for remote forwarding */ 124 # define QSELFREF 000200 /* this address references itself */ 125 # define QVERIFIED 000400 /* verified, but not expanded */ 126 # define QREPORT 001000 /* report this address in return message */ 127 # define QBOGUSSHELL 002000 /* this entry has an invalid shell listed */ 128 # define QUNSAFEADDR 004000 /* address aquired through an unsafe path */ 129 130 # define NULLADDR ((ADDRESS *) NULL) 131 /* 132 ** Mailer definition structure. 133 ** Every mailer known to the system is declared in this 134 ** structure. It defines the pathname of the mailer, some 135 ** flags associated with it, and the argument vector to 136 ** pass to it. The flags are defined in conf.c 137 ** 138 ** The argument vector is expanded before actual use. All 139 ** words except the first are passed through the macro 140 ** processor. 141 */ 142 143 struct mailer 144 { 145 char *m_name; /* symbolic name of this mailer */ 146 char *m_mailer; /* pathname of the mailer to use */ 147 BITMAP m_flags; /* status flags, see below */ 148 short m_mno; /* mailer number internally */ 149 char **m_argv; /* template argument vector */ 150 short m_sh_rwset; /* rewrite set: sender header addresses */ 151 short m_se_rwset; /* rewrite set: sender envelope addresses */ 152 short m_rh_rwset; /* rewrite set: recipient header addresses */ 153 short m_re_rwset; /* rewrite set: recipient envelope addresses */ 154 char *m_eol; /* end of line string */ 155 long m_maxsize; /* size limit on message to this mailer */ 156 int m_linelimit; /* max # characters per line */ 157 char *m_execdir; /* directory to chdir to before execv */ 158 uid_t m_uid; /* UID to run as */ 159 gid_t m_gid; /* GID to run as */ 160 }; 161 162 typedef struct mailer MAILER; 163 164 /* bits for m_flags */ 165 # define M_ESMTP 'a' /* run Extended SMTP protocol */ 166 # define M_ALIASABLE 'A' /* user can be LHS of an alias */ 167 # define M_BLANKEND 'b' /* ensure blank line at end of message */ 168 # define M_NOCOMMENT 'c' /* don't include comment part of address */ 169 # define M_CANONICAL 'C' /* make addresses canonical "u@dom" */ 170 # define M_NOBRACKET 'd' /* never angle bracket envelope route-addrs */ 171 /* 'D' /* CF: include Date: */ 172 # define M_EXPENSIVE 'e' /* it costs to use this mailer.... */ 173 # define M_ESCFROM 'E' /* escape From lines to >From */ 174 # define M_FOPT 'f' /* mailer takes picky -f flag */ 175 /* 'F' /* CF: include From: or Resent-From: */ 176 # define M_NO_NULL_FROM 'g' /* sender of errors should be $g */ 177 # define M_HST_UPPER 'h' /* preserve host case distinction */ 178 # define M_PREHEAD 'H' /* MAIL11V3: preview headers */ 179 # define M_INTERNAL 'I' /* SMTP to another sendmail site */ 180 # define M_NOLOOPCHECK 'k' /* don't check for loops in HELO command */ 181 # define M_LOCALMAILER 'l' /* delivery is to this host */ 182 # define M_LIMITS 'L' /* must enforce SMTP line limits */ 183 # define M_MUSER 'm' /* can handle multiple users at once */ 184 /* 'M' /* CF: include Message-Id: */ 185 # define M_NHDR 'n' /* don't insert From line */ 186 # define M_MANYSTATUS 'N' /* MAIL11V3: DATA returns multi-status */ 187 # define M_RUNASRCPT 'o' /* always run mailer as recipient */ 188 # define M_FROMPATH 'p' /* use reverse-path in MAIL FROM: */ 189 /* 'P' /* CF: include Return-Path: */ 190 # define M_ROPT 'r' /* mailer takes picky -r flag */ 191 # define M_SECURE_PORT 'R' /* try to send on a reserved TCP port */ 192 # define M_STRIPQ 's' /* strip quote chars from user/host */ 193 # define M_SPECIFIC_UID 'S' /* run as specific uid/gid */ 194 # define M_USR_UPPER 'u' /* preserve user case distinction */ 195 # define M_UGLYUUCP 'U' /* this wants an ugly UUCP from line */ 196 /* 'V' /* UIUC: !-relativize all addresses */ 197 # define M_HASPWENT 'w' /* check for /etc/passwd entry */ 198 /* 'x' /* CF: include Full-Name: */ 199 # define M_XDOT 'X' /* use hidden-dot algorithm */ 200 # define M_TRYRULESET5 '5' /* use ruleset 5 after local aliasing */ 201 # define M_7BITS '7' /* use 7-bit path */ 202 # define M_CHECKINCLUDE ':' /* check for :include: files */ 203 # define M_CHECKPROG '|' /* check for |program addresses */ 204 # define M_CHECKFILE '/' /* check for /file addresses */ 205 # define M_CHECKUDB '@' /* user can be user database key */ 206 207 EXTERN MAILER *Mailer[MAXMAILERS+1]; 208 209 EXTERN MAILER *LocalMailer; /* ptr to local mailer */ 210 EXTERN MAILER *ProgMailer; /* ptr to program mailer */ 211 EXTERN MAILER *FileMailer; /* ptr to *file* mailer */ 212 EXTERN MAILER *InclMailer; /* ptr to *include* mailer */ 213 /* 214 ** Header structure. 215 ** This structure is used internally to store header items. 216 */ 217 218 struct header 219 { 220 char *h_field; /* the name of the field */ 221 char *h_value; /* the value of that field */ 222 struct header *h_link; /* the next header */ 223 u_short h_flags; /* status bits, see below */ 224 BITMAP h_mflags; /* m_flags bits needed */ 225 }; 226 227 typedef struct header HDR; 228 229 /* 230 ** Header information structure. 231 ** Defined in conf.c, this struct declares the header fields 232 ** that have some magic meaning. 233 */ 234 235 struct hdrinfo 236 { 237 char *hi_field; /* the name of the field */ 238 u_short hi_flags; /* status bits, see below */ 239 }; 240 241 extern struct hdrinfo HdrInfo[]; 242 243 /* bits for h_flags and hi_flags */ 244 # define H_EOH 00001 /* this field terminates header */ 245 # define H_RCPT 00002 /* contains recipient addresses */ 246 # define H_DEFAULT 00004 /* if another value is found, drop this */ 247 # define H_RESENT 00010 /* this address is a "Resent-..." address */ 248 # define H_CHECK 00020 /* check h_mflags against m_flags */ 249 # define H_ACHECK 00040 /* ditto, but always (not just default) */ 250 # define H_FORCE 00100 /* force this field, even if default */ 251 # define H_TRACE 00200 /* this field contains trace information */ 252 # define H_FROM 00400 /* this is a from-type field */ 253 # define H_VALID 01000 /* this field has a validated value */ 254 # define H_RECEIPTTO 02000 /* this field has return receipt info */ 255 # define H_ERRORSTO 04000 /* this field has error address info */ 256 /* 257 ** Information about currently open connections to mailers, or to 258 ** hosts that we have looked up recently. 259 */ 260 261 # define MCI struct mailer_con_info 262 263 MCI 264 { 265 short mci_flags; /* flag bits, see below */ 266 short mci_errno; /* error number on last connection */ 267 short mci_herrno; /* h_errno from last DNS lookup */ 268 short mci_exitstat; /* exit status from last connection */ 269 short mci_state; /* SMTP state */ 270 long mci_maxsize; /* max size this server will accept */ 271 FILE *mci_in; /* input side of connection */ 272 FILE *mci_out; /* output side of connection */ 273 int mci_pid; /* process id of subordinate proc */ 274 char *mci_phase; /* SMTP phase string */ 275 struct mailer *mci_mailer; /* ptr to the mailer for this conn */ 276 char *mci_host; /* host name */ 277 time_t mci_lastuse; /* last usage time */ 278 }; 279 280 281 /* flag bits */ 282 #define MCIF_VALID 000001 /* this entry is valid */ 283 #define MCIF_TEMP 000002 /* don't cache this connection */ 284 #define MCIF_CACHED 000004 /* currently in open cache */ 285 #define MCIF_ESMTP 000010 /* this host speaks ESMTP */ 286 #define MCIF_EXPN 000020 /* EXPN command supported */ 287 #define MCIF_SIZE 000040 /* SIZE option supported */ 288 #define MCIF_8BITMIME 000100 /* BODY=8BITMIME supported */ 289 #define MCIF_7BIT 000200 /* strip this message to 7 bits */ 290 #define MCIF_MULTSTAT 000400 /* MAIL11V3: handles MULT status */ 291 #define MCIF_INHEADER 001000 /* currently outputing header */ 292 #define MCIF_CVT8TO7 002000 /* convert from 8 to 7 bits */ 293 294 /* states */ 295 #define MCIS_CLOSED 0 /* no traffic on this connection */ 296 #define MCIS_OPENING 1 /* sending initial protocol */ 297 #define MCIS_OPEN 2 /* open, initial protocol sent */ 298 #define MCIS_ACTIVE 3 /* message being sent */ 299 #define MCIS_QUITING 4 /* running quit protocol */ 300 #define MCIS_SSD 5 /* service shutting down */ 301 #define MCIS_ERROR 6 /* I/O error on connection */ 302 /* 303 ** Envelope structure. 304 ** This structure defines the message itself. There is usually 305 ** only one of these -- for the message that we originally read 306 ** and which is our primary interest -- but other envelopes can 307 ** be generated during processing. For example, error messages 308 ** will have their own envelope. 309 */ 310 311 # define ENVELOPE struct envelope 312 313 ENVELOPE 314 { 315 HDR *e_header; /* head of header list */ 316 long e_msgpriority; /* adjusted priority of this message */ 317 time_t e_ctime; /* time message appeared in the queue */ 318 char *e_to; /* the target person */ 319 char *e_receiptto; /* return receipt address */ 320 ADDRESS e_from; /* the person it is from */ 321 char *e_sender; /* e_from.q_paddr w comments stripped */ 322 char **e_fromdomain; /* the domain part of the sender */ 323 ADDRESS *e_sendqueue; /* list of message recipients */ 324 ADDRESS *e_errorqueue; /* the queue for error responses */ 325 long e_msgsize; /* size of the message in bytes */ 326 long e_flags; /* flags, see below */ 327 int e_nrcpts; /* number of recipients */ 328 short e_class; /* msg class (priority, junk, etc.) */ 329 short e_hopcount; /* number of times processed */ 330 short e_nsent; /* number of sends since checkpoint */ 331 short e_sendmode; /* message send mode */ 332 short e_errormode; /* error return mode */ 333 int (*e_puthdr)__P((MCI *, HDR *, ENVELOPE *)); 334 /* function to put header of message */ 335 int (*e_putbody)__P((MCI *, ENVELOPE *, char *)); 336 /* function to put body of message */ 337 struct envelope *e_parent; /* the message this one encloses */ 338 struct envelope *e_sibling; /* the next envelope of interest */ 339 char *e_bodytype; /* type of message body */ 340 char *e_df; /* location of temp file */ 341 FILE *e_dfp; /* temporary file */ 342 char *e_id; /* code for this entry in queue */ 343 FILE *e_xfp; /* transcript file */ 344 FILE *e_lockfp; /* the lock file for this message */ 345 char *e_message; /* error message */ 346 char *e_statmsg; /* stat msg (changes per delivery) */ 347 char *e_msgboundary; /* MIME-style message part boundary */ 348 char *e_origrcpt; /* original recipient (one only) */ 349 time_t e_dtime; /* time of last delivery attempt */ 350 int e_ntries; /* number of delivery attempts */ 351 ino_t e_dfino; /* df file's ino, for crash recovery */ 352 char *e_macro[128]; /* macro definitions */ 353 }; 354 355 /* values for e_flags */ 356 #define EF_OLDSTYLE 0x0000001 /* use spaces (not commas) in hdrs */ 357 #define EF_INQUEUE 0x0000002 /* this message is fully queued */ 358 #define EF_NORETURN 0x0000004 /* don't return the message on error */ 359 #define EF_CLRQUEUE 0x0000008 /* disk copy is no longer needed */ 360 #define EF_SENDRECEIPT 0x0000010 /* send a return receipt */ 361 #define EF_FATALERRS 0x0000020 /* fatal errors occured */ 362 #define EF_KEEPQUEUE 0x0000040 /* keep queue files always */ 363 #define EF_RESPONSE 0x0000080 /* this is an error or return receipt */ 364 #define EF_RESENT 0x0000100 /* this message is being forwarded */ 365 #define EF_VRFYONLY 0x0000200 /* verify only (don't expand aliases) */ 366 #define EF_WARNING 0x0000400 /* warning message has been sent */ 367 #define EF_QUEUERUN 0x0000800 /* this envelope is from queue */ 368 #define EF_GLOBALERRS 0x0001000 /* treat errors as global */ 369 #define EF_PM_NOTIFY 0x0002000 /* send return mail to postmaster */ 370 #define EF_METOO 0x0004000 /* send to me too */ 371 #define EF_LOGSENDER 0x0008000 /* need to log the sender */ 372 #define EF_NORECEIPT 0x0010000 /* suppress all return-receipts */ 373 #define EF_HAS8BIT 0x0020000 /* at least one 8-bit char in body */ 374 #define EF_NL_NOT_EOL 0x0040000 /* don't accept raw NL as EOLine */ 375 #define EF_CRLF_NOT_EOL 0x0080000 /* don't accept CR-LF as EOLine */ 376 377 EXTERN ENVELOPE *CurEnv; /* envelope currently being processed */ 378 /* 379 ** Message priority classes. 380 ** 381 ** The message class is read directly from the Priority: header 382 ** field in the message. 383 ** 384 ** CurEnv->e_msgpriority is the number of bytes in the message plus 385 ** the creation time (so that jobs ``tend'' to be ordered correctly), 386 ** adjusted by the message class, the number of recipients, and the 387 ** amount of time the message has been sitting around. This number 388 ** is used to order the queue. Higher values mean LOWER priority. 389 ** 390 ** Each priority class point is worth WkClassFact priority points; 391 ** each recipient is worth WkRecipFact priority points. Each time 392 ** we reprocess a message the priority is adjusted by WkTimeFact. 393 ** WkTimeFact should normally decrease the priority so that jobs 394 ** that have historically failed will be run later; thanks go to 395 ** Jay Lepreau at Utah for pointing out the error in my thinking. 396 ** 397 ** The "class" is this number, unadjusted by the age or size of 398 ** this message. Classes with negative representations will have 399 ** error messages thrown away if they are not local. 400 */ 401 402 struct priority 403 { 404 char *pri_name; /* external name of priority */ 405 int pri_val; /* internal value for same */ 406 }; 407 408 EXTERN struct priority Priorities[MAXPRIORITIES]; 409 EXTERN int NumPriorities; /* pointer into Priorities */ 410 /* 411 ** Rewrite rules. 412 */ 413 414 struct rewrite 415 { 416 char **r_lhs; /* pattern match */ 417 char **r_rhs; /* substitution value */ 418 struct rewrite *r_next;/* next in chain */ 419 }; 420 421 EXTERN struct rewrite *RewriteRules[MAXRWSETS]; 422 423 /* 424 ** Special characters in rewriting rules. 425 ** These are used internally only. 426 ** The COND* rules are actually used in macros rather than in 427 ** rewriting rules, but are given here because they 428 ** cannot conflict. 429 */ 430 431 /* left hand side items */ 432 # define MATCHZANY 0220 /* match zero or more tokens */ 433 # define MATCHANY 0221 /* match one or more tokens */ 434 # define MATCHONE 0222 /* match exactly one token */ 435 # define MATCHCLASS 0223 /* match one token in a class */ 436 # define MATCHNCLASS 0224 /* match anything not in class */ 437 # define MATCHREPL 0225 /* replacement on RHS for above */ 438 439 /* right hand side items */ 440 # define CANONNET 0226 /* canonical net, next token */ 441 # define CANONHOST 0227 /* canonical host, next token */ 442 # define CANONUSER 0230 /* canonical user, next N tokens */ 443 # define CALLSUBR 0231 /* call another rewriting set */ 444 445 /* conditionals in macros */ 446 # define CONDIF 0232 /* conditional if-then */ 447 # define CONDELSE 0233 /* conditional else */ 448 # define CONDFI 0234 /* conditional fi */ 449 450 /* bracket characters for host name lookup */ 451 # define HOSTBEGIN 0235 /* hostname lookup begin */ 452 # define HOSTEND 0236 /* hostname lookup end */ 453 454 /* bracket characters for generalized lookup */ 455 # define LOOKUPBEGIN 0205 /* generalized lookup begin */ 456 # define LOOKUPEND 0206 /* generalized lookup end */ 457 458 /* macro substitution character */ 459 # define MACROEXPAND 0201 /* macro expansion */ 460 # define MACRODEXPAND 0202 /* deferred macro expansion */ 461 462 /* to make the code clearer */ 463 # define MATCHZERO CANONHOST 464 465 /* external <==> internal mapping table */ 466 struct metamac 467 { 468 char metaname; /* external code (after $) */ 469 u_char metaval; /* internal code (as above) */ 470 }; 471 /* 472 ** Name canonification short circuit. 473 ** 474 ** If the name server for a host is down, the process of trying to 475 ** canonify the name can hang. This is similar to (but alas, not 476 ** identical to) looking up the name for delivery. This stab type 477 ** caches the result of the name server lookup so we don't hang 478 ** multiple times. 479 */ 480 481 #define NAMECANON struct _namecanon 482 483 NAMECANON 484 { 485 short nc_errno; /* cached errno */ 486 short nc_herrno; /* cached h_errno */ 487 short nc_stat; /* cached exit status code */ 488 short nc_flags; /* flag bits */ 489 char *nc_cname; /* the canonical name */ 490 }; 491 492 /* values for nc_flags */ 493 #define NCF_VALID 0x0001 /* entry valid */ 494 /* 495 ** Mapping functions 496 ** 497 ** These allow arbitrary mappings in the config file. The idea 498 ** (albeit not the implementation) comes from IDA sendmail. 499 */ 500 501 # define MAPCLASS struct _mapclass 502 # define MAP struct _map 503 504 505 /* 506 ** An actual map. 507 */ 508 509 MAP 510 { 511 MAPCLASS *map_class; /* the class of this map */ 512 char *map_mname; /* name of this map */ 513 int map_mflags; /* flags, see below */ 514 char *map_file; /* the (nominal) filename */ 515 ARBPTR_T map_db1; /* the open database ptr */ 516 ARBPTR_T map_db2; /* an "extra" database pointer */ 517 char *map_app; /* to append to successful matches */ 518 char *map_domain; /* the (nominal) NIS domain */ 519 char *map_rebuild; /* program to run to do auto-rebuild */ 520 time_t map_mtime; /* last database modification time */ 521 }; 522 523 /* bit values for map_flags */ 524 # define MF_VALID 0x0001 /* this entry is valid */ 525 # define MF_INCLNULL 0x0002 /* include null byte in key */ 526 # define MF_OPTIONAL 0x0004 /* don't complain if map not found */ 527 # define MF_NOFOLDCASE 0x0008 /* don't fold case in keys */ 528 # define MF_MATCHONLY 0x0010 /* don't use the map value */ 529 # define MF_OPEN 0x0020 /* this entry is open */ 530 # define MF_WRITABLE 0x0040 /* open for writing */ 531 # define MF_ALIAS 0x0080 /* this is an alias file */ 532 # define MF_TRY0NULL 0x0100 /* try with no null byte */ 533 # define MF_TRY1NULL 0x0200 /* try with the null byte */ 534 # define MF_LOCKED 0x0400 /* this map is currently locked */ 535 # define MF_ALIASWAIT 0x0800 /* alias map in aliaswait state */ 536 # define MF_IMPL_HASH 0x1000 /* implicit: underlying hash database */ 537 # define MF_IMPL_NDBM 0x2000 /* implicit: underlying NDBM database */ 538 # define MF_UNSAFEDB 0x4000 /* this map is world writable */ 539 540 541 /* 542 ** The class of a map -- essentially the functions to call 543 */ 544 545 MAPCLASS 546 { 547 char *map_cname; /* name of this map class */ 548 char *map_ext; /* extension for database file */ 549 short map_cflags; /* flag bits, see below */ 550 bool (*map_parse)__P((MAP *, char *)); 551 /* argument parsing function */ 552 char *(*map_lookup)__P((MAP *, char *, char **, int *)); 553 /* lookup function */ 554 void (*map_store)__P((MAP *, char *, char *)); 555 /* store function */ 556 bool (*map_open)__P((MAP *, int)); 557 /* open function */ 558 void (*map_close)__P((MAP *)); 559 /* close function */ 560 }; 561 562 /* bit values for map_cflags */ 563 #define MCF_ALIASOK 0x0001 /* can be used for aliases */ 564 #define MCF_ALIASONLY 0x0002 /* usable only for aliases */ 565 #define MCF_REBUILDABLE 0x0004 /* can rebuild alias files */ 566 /* 567 ** Symbol table definitions 568 */ 569 570 struct symtab 571 { 572 char *s_name; /* name to be entered */ 573 char s_type; /* general type (see below) */ 574 struct symtab *s_next; /* pointer to next in chain */ 575 union 576 { 577 BITMAP sv_class; /* bit-map of word classes */ 578 ADDRESS *sv_addr; /* pointer to address header */ 579 MAILER *sv_mailer; /* pointer to mailer */ 580 char *sv_alias; /* alias */ 581 MAPCLASS sv_mapclass; /* mapping function class */ 582 MAP sv_map; /* mapping function */ 583 char *sv_hostsig; /* host signature */ 584 MCI sv_mci; /* mailer connection info */ 585 NAMECANON sv_namecanon; /* canonical name cache */ 586 } s_value; 587 }; 588 589 typedef struct symtab STAB; 590 591 /* symbol types */ 592 # define ST_UNDEF 0 /* undefined type */ 593 # define ST_CLASS 1 /* class map */ 594 # define ST_ADDRESS 2 /* an address in parsed format */ 595 # define ST_MAILER 3 /* a mailer header */ 596 # define ST_ALIAS 4 /* an alias */ 597 # define ST_MAPCLASS 5 /* mapping function class */ 598 # define ST_MAP 6 /* mapping function */ 599 # define ST_HOSTSIG 7 /* host signature */ 600 # define ST_NAMECANON 8 /* cached canonical name */ 601 # define ST_MCI 16 /* mailer connection info (offset) */ 602 603 # define s_class s_value.sv_class 604 # define s_address s_value.sv_addr 605 # define s_mailer s_value.sv_mailer 606 # define s_alias s_value.sv_alias 607 # define s_mci s_value.sv_mci 608 # define s_mapclass s_value.sv_mapclass 609 # define s_hostsig s_value.sv_hostsig 610 # define s_map s_value.sv_map 611 # define s_namecanon s_value.sv_namecanon 612 613 extern STAB *stab __P((char *, int, int)); 614 extern void stabapply __P((void (*)(STAB *, int), int)); 615 616 /* opcodes to stab */ 617 # define ST_FIND 0 /* find entry */ 618 # define ST_ENTER 1 /* enter if not there */ 619 /* 620 ** STRUCT EVENT -- event queue. 621 ** 622 ** Maintained in sorted order. 623 ** 624 ** We store the pid of the process that set this event to insure 625 ** that when we fork we will not take events intended for the parent. 626 */ 627 628 struct event 629 { 630 time_t ev_time; /* time of the function call */ 631 int (*ev_func)__P((int)); 632 /* function to call */ 633 int ev_arg; /* argument to ev_func */ 634 int ev_pid; /* pid that set this event */ 635 struct event *ev_link; /* link to next item */ 636 }; 637 638 typedef struct event EVENT; 639 640 EXTERN EVENT *EventQueue; /* head of event queue */ 641 /* 642 ** Operation, send, error, and MIME modes 643 ** 644 ** The operation mode describes the basic operation of sendmail. 645 ** This can be set from the command line, and is "send mail" by 646 ** default. 647 ** 648 ** The send mode tells how to send mail. It can be set in the 649 ** configuration file. It's setting determines how quickly the 650 ** mail will be delivered versus the load on your system. If the 651 ** -v (verbose) flag is given, it will be forced to SM_DELIVER 652 ** mode. 653 ** 654 ** The error mode tells how to return errors. 655 */ 656 657 EXTERN char OpMode; /* operation mode, see below */ 658 659 #define MD_DELIVER 'm' /* be a mail sender */ 660 #define MD_SMTP 's' /* run SMTP on standard input */ 661 #define MD_ARPAFTP 'a' /* obsolete ARPANET mode (Grey Book) */ 662 #define MD_DAEMON 'd' /* run as a daemon */ 663 #define MD_VERIFY 'v' /* verify: don't collect or deliver */ 664 #define MD_TEST 't' /* test mode: resolve addrs only */ 665 #define MD_INITALIAS 'i' /* initialize alias database */ 666 #define MD_PRINT 'p' /* print the queue */ 667 #define MD_FREEZE 'z' /* freeze the configuration file */ 668 669 670 /* values for e_sendmode -- send modes */ 671 #define SM_DELIVER 'i' /* interactive delivery */ 672 #define SM_QUICKD 'j' /* deliver w/o queueing */ 673 #define SM_FORK 'b' /* deliver in background */ 674 #define SM_QUEUE 'q' /* queue, don't deliver */ 675 #define SM_VERIFY 'v' /* verify only (used internally) */ 676 677 /* used only as a parameter to sendall */ 678 #define SM_DEFAULT '\0' /* unspecified, use SendMode */ 679 680 681 /* values for e_errormode -- error handling modes */ 682 #define EM_PRINT 'p' /* print errors */ 683 #define EM_MAIL 'm' /* mail back errors */ 684 #define EM_WRITE 'w' /* write back errors */ 685 #define EM_BERKNET 'e' /* special berknet processing */ 686 #define EM_QUIET 'q' /* don't print messages (stat only) */ 687 688 689 /* MIME processing mode */ 690 EXTERN int MimeMode; 691 692 /* bit values for MimeMode */ 693 #define MM_CVTMIME 0x0001 /* convert 8 to 7 bit MIME */ 694 #define MM_PASS8BIT 0x0002 /* just send 8 bit data blind */ 695 #define MM_MIME8BIT 0x0004 /* convert 8-bit data to MIME */ 696 /* 697 ** Additional definitions 698 */ 699 700 701 /* 702 ** Privacy flags 703 ** These are bit values for the PrivacyFlags word. 704 */ 705 706 #define PRIV_PUBLIC 0 /* what have I got to hide? */ 707 #define PRIV_NEEDMAILHELO 00001 /* insist on HELO for MAIL, at least */ 708 #define PRIV_NEEDEXPNHELO 00002 /* insist on HELO for EXPN */ 709 #define PRIV_NEEDVRFYHELO 00004 /* insist on HELO for VRFY */ 710 #define PRIV_NOEXPN 00010 /* disallow EXPN command entirely */ 711 #define PRIV_NOVRFY 00020 /* disallow VRFY command entirely */ 712 #define PRIV_AUTHWARNINGS 00040 /* flag possible authorization probs */ 713 #define PRIV_NORECEIPTS 00100 /* disallow return receipts */ 714 #define PRIV_RESTRICTMAILQ 01000 /* restrict mailq command */ 715 #define PRIV_RESTRICTQRUN 02000 /* restrict queue run */ 716 #define PRIV_GOAWAY 00777 /* don't give no info, anyway, anyhow */ 717 718 /* struct defining such things */ 719 struct prival 720 { 721 char *pv_name; /* name of privacy flag */ 722 int pv_flag; /* numeric level */ 723 }; 724 725 726 /* 727 ** Flags passed to remotename, parseaddr, allocaddr, and buildaddr. 728 */ 729 730 #define RF_SENDERADDR 0001 /* this is a sender address */ 731 #define RF_HEADERADDR 0002 /* this is a header address */ 732 #define RF_CANONICAL 0004 /* strip comment information */ 733 #define RF_ADDDOMAIN 0010 /* OK to do domain extension */ 734 #define RF_COPYPARSE 0020 /* copy parsed user & host */ 735 #define RF_COPYPADDR 0040 /* copy print address */ 736 #define RF_COPYALL (RF_COPYPARSE|RF_COPYPADDR) 737 #define RF_COPYNONE 0 738 739 740 /* 741 ** Flags passed to safefile. 742 */ 743 744 #define SFF_ANYFILE 0 /* no special restrictions */ 745 #define SFF_MUSTOWN 0x0001 /* user must own this file */ 746 #define SFF_NOSLINK 0x0002 /* file cannot be a symbolic link */ 747 #define SFF_ROOTOK 0x0004 /* ok for root to own this file */ 748 749 750 /* 751 ** Regular UNIX sockaddrs are too small to handle ISO addresses, so 752 ** we are forced to declare a supertype here. 753 */ 754 755 union bigsockaddr 756 { 757 struct sockaddr sa; /* general version */ 758 #ifdef NETUNIX 759 struct sockaddr_un sunix; /* UNIX family */ 760 #endif 761 #ifdef NETINET 762 struct sockaddr_in sin; /* INET family */ 763 #endif 764 #ifdef NETISO 765 struct sockaddr_iso siso; /* ISO family */ 766 #endif 767 #ifdef NETNS 768 struct sockaddr_ns sns; /* XNS family */ 769 #endif 770 #ifdef NETX25 771 struct sockaddr_x25 sx25; /* X.25 family */ 772 #endif 773 }; 774 775 #define SOCKADDR union bigsockaddr 776 /* 777 ** Global variables. 778 */ 779 780 EXTERN bool FromFlag; /* if set, "From" person is explicit */ 781 EXTERN bool MeToo; /* send to the sender also */ 782 EXTERN bool IgnrDot; /* don't let dot end messages */ 783 EXTERN bool SaveFrom; /* save leading "From" lines */ 784 EXTERN bool Verbose; /* set if blow-by-blow desired */ 785 EXTERN bool GrabTo; /* if set, get recipients from msg */ 786 EXTERN bool SuprErrs; /* set if we are suppressing errors */ 787 EXTERN bool HoldErrs; /* only output errors to transcript */ 788 EXTERN bool NoConnect; /* don't connect to non-local mailers */ 789 EXTERN bool SuperSafe; /* be extra careful, even if expensive */ 790 EXTERN bool ForkQueueRuns; /* fork for each job when running the queue */ 791 EXTERN bool AutoRebuild; /* auto-rebuild the alias database as needed */ 792 EXTERN bool CheckAliases; /* parse addresses during newaliases */ 793 EXTERN bool NoAlias; /* suppress aliasing */ 794 EXTERN bool UseNameServer; /* use internet domain name server */ 795 EXTERN bool SevenBitInput; /* force 7-bit data on input */ 796 EXTERN bool HasEightBits; /* has at least one eight bit input byte */ 797 EXTERN time_t SafeAlias; /* interval to wait until @:@ in alias file */ 798 EXTERN FILE *InChannel; /* input connection */ 799 EXTERN FILE *OutChannel; /* output connection */ 800 EXTERN uid_t RealUid; /* when Daemon, real uid of caller */ 801 EXTERN gid_t RealGid; /* when Daemon, real gid of caller */ 802 EXTERN uid_t DefUid; /* default uid to run as */ 803 EXTERN gid_t DefGid; /* default gid to run as */ 804 EXTERN char *DefUser; /* default user to run as (from DefUid) */ 805 EXTERN int OldUmask; /* umask when sendmail starts up */ 806 EXTERN int Errors; /* set if errors (local to single pass) */ 807 EXTERN int ExitStat; /* exit status code */ 808 EXTERN int AliasLevel; /* depth of aliasing */ 809 EXTERN int LineNumber; /* line number in current input */ 810 EXTERN int LogLevel; /* level of logging to perform */ 811 EXTERN int FileMode; /* mode on files */ 812 EXTERN int QueueLA; /* load average starting forced queueing */ 813 EXTERN int RefuseLA; /* load average refusing connections are */ 814 EXTERN int CurrentLA; /* current load average */ 815 EXTERN long QueueFactor; /* slope of queue function */ 816 EXTERN time_t QueueIntvl; /* intervals between running the queue */ 817 EXTERN char *HelpFile; /* location of SMTP help file */ 818 EXTERN char *ErrMsgFile; /* file to prepend to all error messages */ 819 EXTERN char *StatFile; /* location of statistics summary */ 820 EXTERN char *QueueDir; /* location of queue directory */ 821 EXTERN char *FileName; /* name to print on error messages */ 822 EXTERN char *SmtpPhase; /* current phase in SMTP processing */ 823 EXTERN char *MyHostName; /* name of this host for SMTP messages */ 824 EXTERN char *RealHostName; /* name of host we are talking to */ 825 EXTERN SOCKADDR RealHostAddr; /* address of host we are talking to */ 826 EXTERN char *CurHostName; /* current host we are dealing with */ 827 EXTERN jmp_buf TopFrame; /* branch-to-top-of-loop-on-error frame */ 828 EXTERN bool QuickAbort; /* .... but only if we want a quick abort */ 829 EXTERN bool LogUsrErrs; /* syslog user errors (e.g., SMTP RCPT cmd) */ 830 EXTERN bool SendMIMEErrors; /* send error messages in MIME format */ 831 EXTERN bool MatchGecos; /* look for user names in gecos field */ 832 EXTERN bool UseErrorsTo; /* use Errors-To: header (back compat) */ 833 EXTERN bool TryNullMXList; /* if we are the best MX, try host directly */ 834 EXTERN bool InChild; /* true if running in an SMTP subprocess */ 835 EXTERN bool DisConnected; /* running with OutChannel redirected to xf */ 836 EXTERN char SpaceSub; /* substitution for <lwsp> */ 837 EXTERN int PrivacyFlags; /* privacy flags */ 838 EXTERN char *ConfFile; /* location of configuration file [conf.c] */ 839 extern char *PidFile; /* location of proc id file [conf.c] */ 840 extern ADDRESS NullAddress; /* a null (template) address [main.c] */ 841 EXTERN long WkClassFact; /* multiplier for message class -> priority */ 842 EXTERN long WkRecipFact; /* multiplier for # of recipients -> priority */ 843 EXTERN long WkTimeFact; /* priority offset each time this job is run */ 844 EXTERN char *UdbSpec; /* user database source spec */ 845 EXTERN int MaxHopCount; /* max # of hops until bounce */ 846 EXTERN int ConfigLevel; /* config file level */ 847 EXTERN char *TimeZoneSpec; /* override time zone specification */ 848 EXTERN char *ForwardPath; /* path to search for .forward files */ 849 EXTERN long MinBlocksFree; /* min # of blocks free on queue fs */ 850 EXTERN char *FallBackMX; /* fall back MX host */ 851 EXTERN long MaxMessageSize; /* advertised max size we will accept */ 852 EXTERN char *PostMasterCopy; /* address to get errs cc's */ 853 EXTERN int CheckpointInterval; /* queue file checkpoint interval */ 854 EXTERN bool DontPruneRoutes; /* don't prune source routes */ 855 EXTERN bool BrokenSmtpPeers; /* peers can't handle 2-line greeting */ 856 EXTERN bool SortQueueByHost; /* order queue by host name first */ 857 EXTERN int MaxMciCache; /* maximum entries in MCI cache */ 858 EXTERN time_t MciCacheTimeout; /* maximum idle time on connections */ 859 EXTERN char *QueueLimitRecipient; /* limit queue runs to this recipient */ 860 EXTERN char *QueueLimitSender; /* limit queue runs to this sender */ 861 EXTERN char *QueueLimitId; /* limit queue runs to this id */ 862 EXTERN FILE *TrafficLogFile; /* file in which to log all traffic */ 863 extern int errno; 864 865 866 /* 867 ** Timeouts 868 ** 869 ** Indicated values are the MINIMUM per RFC 1123 section 5.3.2. 870 */ 871 872 EXTERN struct 873 { 874 /* RFC 1123-specified timeouts [minimum value] */ 875 time_t to_initial; /* initial greeting timeout [5m] */ 876 time_t to_mail; /* MAIL command [5m] */ 877 time_t to_rcpt; /* RCPT command [5m] */ 878 time_t to_datainit; /* DATA initiation [2m] */ 879 time_t to_datablock; /* DATA block [3m] */ 880 time_t to_datafinal; /* DATA completion [10m] */ 881 time_t to_nextcommand; /* next command [5m] */ 882 /* following timeouts are not mentioned in RFC 1123 */ 883 time_t to_rset; /* RSET command */ 884 time_t to_helo; /* HELO command */ 885 time_t to_quit; /* QUIT command */ 886 time_t to_miscshort; /* misc short commands (NOOP, VERB, etc) */ 887 time_t to_ident; /* IDENT protocol requests */ 888 /* following are per message */ 889 time_t to_q_return; /* queue return timeout */ 890 time_t to_q_warning; /* queue warning timeout */ 891 } TimeOuts; 892 893 894 /* 895 ** Trace information 896 */ 897 898 /* trace vector and macros for debugging flags */ 899 EXTERN u_char tTdvect[100]; 900 # define tTd(flag, level) (tTdvect[flag] >= level) 901 # define tTdlevel(flag) (tTdvect[flag]) 902 /* 903 ** Miscellaneous information. 904 */ 905 906 907 908 /* 909 ** Some in-line functions 910 */ 911 912 /* set exit status */ 913 #define setstat(s) { \ 914 if (ExitStat == EX_OK || ExitStat == EX_TEMPFAIL) \ 915 ExitStat = s; \ 916 } 917 918 /* make a copy of a string */ 919 #define newstr(s) strcpy(xalloc(strlen(s) + 1), s) 920 921 #define STRUCTCOPY(s, d) d = s 922 923 924 /* 925 ** Declarations of useful functions 926 */ 927 928 extern ADDRESS *parseaddr __P((char *, ADDRESS *, int, int, char **, ENVELOPE *)); 929 extern char *xalloc __P((int)); 930 extern bool sameaddr __P((ADDRESS *, ADDRESS *)); 931 extern FILE *dfopen __P((char *, int, int)); 932 extern EVENT *setevent __P((time_t, int(*)(), int)); 933 extern char *sfgets __P((char *, int, FILE *, time_t, char *)); 934 extern char *queuename __P((ENVELOPE *, int)); 935 extern time_t curtime __P(()); 936 extern bool transienterror __P((int)); 937 extern const char *errstring __P((int)); 938 extern void expand __P((char *, char *, char *, ENVELOPE *)); 939 extern void define __P((int, char *, ENVELOPE *)); 940 extern char *macvalue __P((int, ENVELOPE *)); 941 extern char **prescan __P((char *, int, char[], int, char **)); 942 extern int rewrite __P((char **, int, int, ENVELOPE *)); 943 extern char *fgetfolded __P((char *, int, FILE *)); 944 extern ADDRESS *recipient __P((ADDRESS *, ADDRESS **, ENVELOPE *)); 945 extern ENVELOPE *newenvelope __P((ENVELOPE *, ENVELOPE *)); 946 extern void dropenvelope __P((ENVELOPE *)); 947 extern void clearenvelope __P((ENVELOPE *, int)); 948 extern char *username __P(()); 949 extern MCI *mci_get __P((char *, MAILER *)); 950 extern char *pintvl __P((time_t, int)); 951 extern char *map_rewrite __P((MAP *, char *, int, char **)); 952 extern ADDRESS *getctladdr __P((ADDRESS *)); 953 extern char *anynet_ntoa __P((SOCKADDR *)); 954 extern char *remotename __P((char *, MAILER *, int, int *, ENVELOPE *)); 955 extern bool shouldqueue __P((long, time_t)); 956 extern bool lockfile __P((int, char *, char *, int)); 957 extern char *hostsignature __P((MAILER *, char *, ENVELOPE *)); 958 extern void openxscript __P((ENVELOPE *)); 959 extern void closexscript __P((ENVELOPE *)); 960 extern sigfunc_t setsignal __P((int, sigfunc_t)); 961 extern char *shortenstring __P((char *, int)); 962 extern bool usershellok __P((char *)); 963 extern void commaize __P((HDR *, char *, int, MCI *, ENVELOPE *)); 964 965 /* ellipsis is a different case though */ 966 #ifdef __STDC__ 967 extern void auth_warning(ENVELOPE *, const char *, ...); 968 extern void syserr(const char *, ...); 969 extern void usrerr(const char *, ...); 970 extern void message(const char *, ...); 971 extern void nmessage(const char *, ...); 972 #else 973 extern void auth_warning(); 974 extern void syserr(); 975 extern void usrerr(); 976 extern void message(); 977 extern void nmessage(); 978 #endif 979