1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)envelope.c 6.26 (Berkeley) 03/19/93"; 11 #endif /* not lint */ 12 13 #include "sendmail.h" 14 #include <sys/time.h> 15 #include <sys/stat.h> 16 #include <pwd.h> 17 18 /* 19 ** NEWENVELOPE -- allocate a new envelope 20 ** 21 ** Supports inheritance. 22 ** 23 ** Parameters: 24 ** e -- the new envelope to fill in. 25 ** parent -- the envelope to be the parent of e. 26 ** 27 ** Returns: 28 ** e. 29 ** 30 ** Side Effects: 31 ** none. 32 */ 33 34 ENVELOPE * 35 newenvelope(e, parent) 36 register ENVELOPE *e; 37 register ENVELOPE *parent; 38 { 39 extern putheader(), putbody(); 40 extern ENVELOPE BlankEnvelope; 41 42 if (e == parent && e->e_parent != NULL) 43 parent = e->e_parent; 44 clearenvelope(e, TRUE); 45 if (e == CurEnv) 46 bcopy((char *) &NullAddress, (char *) &e->e_from, sizeof e->e_from); 47 else 48 bcopy((char *) &CurEnv->e_from, (char *) &e->e_from, sizeof e->e_from); 49 e->e_parent = parent; 50 e->e_ctime = curtime(); 51 if (parent != NULL) 52 e->e_msgpriority = parent->e_msgsize; 53 e->e_puthdr = putheader; 54 e->e_putbody = putbody; 55 if (CurEnv->e_xfp != NULL) 56 (void) fflush(CurEnv->e_xfp); 57 58 return (e); 59 } 60 /* 61 ** DROPENVELOPE -- deallocate an envelope. 62 ** 63 ** Parameters: 64 ** e -- the envelope to deallocate. 65 ** 66 ** Returns: 67 ** none. 68 ** 69 ** Side Effects: 70 ** housekeeping necessary to dispose of an envelope. 71 ** Unlocks this queue file. 72 */ 73 74 dropenvelope(e) 75 register ENVELOPE *e; 76 { 77 bool queueit = FALSE; 78 register ADDRESS *q; 79 char *id = e->e_id; 80 81 if (tTd(50, 1)) 82 { 83 printf("dropenvelope %x: id=", e); 84 xputs(e->e_id); 85 printf(", flags=%o\n", e->e_flags); 86 } 87 88 /* we must have an id to remove disk files */ 89 if (id == NULL) 90 return; 91 92 #ifdef LOG 93 if (LogLevel > 84) 94 syslog(LOG_DEBUG, "dropenvelope, id=%s, flags=%o, pid=%d", 95 id, e->e_flags, getpid()); 96 #endif /* LOG */ 97 98 /* 99 ** Extract state information from dregs of send list. 100 */ 101 102 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 103 { 104 if (bitset(QQUEUEUP, q->q_flags)) 105 queueit = TRUE; 106 } 107 108 /* 109 ** Send back return receipts as requested. 110 */ 111 112 if (e->e_receiptto != NULL && bitset(EF_SENDRECEIPT, e->e_flags)) 113 { 114 auto ADDRESS *rlist = NULL; 115 116 (void) sendtolist(e->e_receiptto, (ADDRESS *) NULL, &rlist, e); 117 (void) returntosender("Return receipt", rlist, FALSE, e); 118 } 119 120 /* 121 ** Arrange to send error messages if there are fatal errors. 122 */ 123 124 if (bitset(EF_FATALERRS|EF_TIMEOUT, e->e_flags) && 125 e->e_errormode != EM_QUIET) 126 savemail(e); 127 128 /* 129 ** Instantiate or deinstantiate the queue. 130 */ 131 132 if ((!queueit && !bitset(EF_KEEPQUEUE, e->e_flags)) || 133 bitset(EF_CLRQUEUE, e->e_flags)) 134 { 135 if (e->e_df != NULL) 136 xunlink(e->e_df); 137 xunlink(queuename(e, 'q')); 138 } 139 else if (queueit || !bitset(EF_INQUEUE, e->e_flags)) 140 { 141 #ifdef QUEUE 142 queueup(e, FALSE, FALSE); 143 #else /* QUEUE */ 144 syserr("554 dropenvelope: queueup"); 145 #endif /* QUEUE */ 146 } 147 148 /* now unlock the job */ 149 closexscript(e); 150 unlockqueue(e); 151 152 /* make sure that this envelope is marked unused */ 153 if (e->e_dfp != NULL) 154 (void) xfclose(e->e_dfp, "dropenvelope", e->e_df); 155 e->e_dfp = NULL; 156 e->e_id = e->e_df = NULL; 157 158 #ifdef LOG 159 if (LogLevel > 74) 160 syslog(LOG_INFO, "%s: done", id); 161 #endif /* LOG */ 162 } 163 /* 164 ** CLEARENVELOPE -- clear an envelope without unlocking 165 ** 166 ** This is normally used by a child process to get a clean 167 ** envelope without disturbing the parent. 168 ** 169 ** Parameters: 170 ** e -- the envelope to clear. 171 ** fullclear - if set, the current envelope is total 172 ** garbage and should be ignored; otherwise, 173 ** release any resources it may indicate. 174 ** 175 ** Returns: 176 ** none. 177 ** 178 ** Side Effects: 179 ** Closes files associated with the envelope. 180 ** Marks the envelope as unallocated. 181 */ 182 183 clearenvelope(e, fullclear) 184 register ENVELOPE *e; 185 bool fullclear; 186 { 187 register HDR *bh; 188 register HDR **nhp; 189 extern ENVELOPE BlankEnvelope; 190 191 if (!fullclear) 192 { 193 /* clear out any file information */ 194 if (e->e_xfp != NULL) 195 (void) xfclose(e->e_xfp, "clearenvelope xfp", e->e_id); 196 if (e->e_dfp != NULL) 197 (void) xfclose(e->e_dfp, "clearenvelope dfp", e->e_df); 198 e->e_xfp = e->e_dfp = NULL; 199 } 200 201 /* now clear out the data */ 202 STRUCTCOPY(BlankEnvelope, *e); 203 bh = BlankEnvelope.e_header; 204 nhp = &e->e_header; 205 while (bh != NULL) 206 { 207 *nhp = (HDR *) xalloc(sizeof *bh); 208 bcopy((char *) bh, (char *) *nhp, sizeof *bh); 209 bh = bh->h_link; 210 nhp = &(*nhp)->h_link; 211 } 212 } 213 /* 214 ** INITSYS -- initialize instantiation of system 215 ** 216 ** In Daemon mode, this is done in the child. 217 ** 218 ** Parameters: 219 ** none. 220 ** 221 ** Returns: 222 ** none. 223 ** 224 ** Side Effects: 225 ** Initializes the system macros, some global variables, 226 ** etc. In particular, the current time in various 227 ** forms is set. 228 */ 229 230 initsys(e) 231 register ENVELOPE *e; 232 { 233 static char cbuf[5]; /* holds hop count */ 234 static char pbuf[10]; /* holds pid */ 235 #ifdef TTYNAME 236 static char ybuf[10]; /* holds tty id */ 237 register char *p; 238 #endif /* TTYNAME */ 239 extern char *ttyname(); 240 extern char *macvalue(); 241 extern char Version[]; 242 243 /* 244 ** Give this envelope a reality. 245 ** I.e., an id, a transcript, and a creation time. 246 */ 247 248 openxscript(e); 249 e->e_ctime = curtime(); 250 251 /* 252 ** Set OutChannel to something useful if stdout isn't it. 253 ** This arranges that any extra stuff the mailer produces 254 ** gets sent back to the user on error (because it is 255 ** tucked away in the transcript). 256 */ 257 258 if (OpMode == MD_DAEMON && !bitset(EF_QUEUERUN, e->e_flags) && 259 e->e_xfp != NULL) 260 OutChannel = e->e_xfp; 261 262 /* 263 ** Set up some basic system macros. 264 */ 265 266 /* process id */ 267 (void) sprintf(pbuf, "%d", getpid()); 268 define('p', pbuf, e); 269 270 /* hop count */ 271 (void) sprintf(cbuf, "%d", e->e_hopcount); 272 define('c', cbuf, e); 273 274 /* time as integer, unix time, arpa time */ 275 settime(e); 276 277 #ifdef TTYNAME 278 /* tty name */ 279 if (macvalue('y', e) == NULL) 280 { 281 p = ttyname(2); 282 if (p != NULL) 283 { 284 if (strrchr(p, '/') != NULL) 285 p = strrchr(p, '/') + 1; 286 (void) strcpy(ybuf, p); 287 define('y', ybuf, e); 288 } 289 } 290 #endif /* TTYNAME */ 291 } 292 /* 293 ** SETTIME -- set the current time. 294 ** 295 ** Parameters: 296 ** none. 297 ** 298 ** Returns: 299 ** none. 300 ** 301 ** Side Effects: 302 ** Sets the various time macros -- $a, $b, $d, $t. 303 */ 304 305 settime(e) 306 register ENVELOPE *e; 307 { 308 register char *p; 309 auto time_t now; 310 static char tbuf[20]; /* holds "current" time */ 311 static char dbuf[30]; /* holds ctime(tbuf) */ 312 register struct tm *tm; 313 extern char *arpadate(); 314 extern struct tm *gmtime(); 315 extern char *macvalue(); 316 317 now = curtime(); 318 tm = gmtime(&now); 319 (void) sprintf(tbuf, "%04d%02d%02d%02d%02d", tm->tm_year + 1900, 320 tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min); 321 define('t', tbuf, e); 322 (void) strcpy(dbuf, ctime(&now)); 323 p = strchr(dbuf, '\n'); 324 if (p != NULL) 325 *p = '\0'; 326 define('d', dbuf, e); 327 p = newstr(arpadate(dbuf)); 328 if (macvalue('a', e) == NULL) 329 define('a', p, e); 330 define('b', p, e); 331 } 332 /* 333 ** OPENXSCRIPT -- Open transcript file 334 ** 335 ** Creates a transcript file for possible eventual mailing or 336 ** sending back. 337 ** 338 ** Parameters: 339 ** e -- the envelope to create the transcript in/for. 340 ** 341 ** Returns: 342 ** none 343 ** 344 ** Side Effects: 345 ** Creates the transcript file. 346 */ 347 348 openxscript(e) 349 register ENVELOPE *e; 350 { 351 register char *p; 352 int fd; 353 354 if (e->e_xfp != NULL) 355 return; 356 p = queuename(e, 'x'); 357 fd = open(p, O_WRONLY|O_CREAT, 0644); 358 if (fd < 0) 359 syserr("Can't create %s", p); 360 else 361 e->e_xfp = fdopen(fd, "w"); 362 } 363 /* 364 ** CLOSEXSCRIPT -- close the transcript file. 365 ** 366 ** Parameters: 367 ** e -- the envelope containing the transcript to close. 368 ** 369 ** Returns: 370 ** none. 371 ** 372 ** Side Effects: 373 ** none. 374 */ 375 376 closexscript(e) 377 register ENVELOPE *e; 378 { 379 if (e->e_xfp == NULL) 380 return; 381 (void) xfclose(e->e_xfp, "closexscript", e->e_id); 382 e->e_xfp = NULL; 383 } 384 /* 385 ** SETSENDER -- set the person who this message is from 386 ** 387 ** Under certain circumstances allow the user to say who 388 ** s/he is (using -f or -r). These are: 389 ** 1. The user's uid is zero (root). 390 ** 2. The user's login name is in an approved list (typically 391 ** from a network server). 392 ** 3. The address the user is trying to claim has a 393 ** "!" character in it (since #2 doesn't do it for 394 ** us if we are dialing out for UUCP). 395 ** A better check to replace #3 would be if the 396 ** effective uid is "UUCP" -- this would require me 397 ** to rewrite getpwent to "grab" uucp as it went by, 398 ** make getname more nasty, do another passwd file 399 ** scan, or compile the UID of "UUCP" into the code, 400 ** all of which are reprehensible. 401 ** 402 ** Assuming all of these fail, we figure out something 403 ** ourselves. 404 ** 405 ** Parameters: 406 ** from -- the person we would like to believe this message 407 ** is from, as specified on the command line. 408 ** e -- the envelope in which we would like the sender set. 409 ** delimptr -- if non-NULL, set to the location of the 410 ** trailing delimiter. 411 ** internal -- set if this address is coming from an internal 412 ** source such as an owner alias. 413 ** 414 ** Returns: 415 ** none. 416 ** 417 ** Side Effects: 418 ** sets sendmail's notion of who the from person is. 419 */ 420 421 setsender(from, e, delimptr, internal) 422 char *from; 423 register ENVELOPE *e; 424 char **delimptr; 425 bool internal; 426 { 427 register char **pvp; 428 char *realname = NULL; 429 register struct passwd *pw; 430 char delimchar; 431 char buf[MAXNAME]; 432 char pvpbuf[PSBUFSIZE]; 433 extern struct passwd *getpwnam(); 434 extern char *macvalue(); 435 extern char **prescan(); 436 extern char *FullName; 437 438 if (tTd(45, 1)) 439 printf("setsender(%s)\n", from == NULL ? "" : from); 440 441 /* 442 ** Figure out the real user executing us. 443 ** Username can return errno != 0 on non-errors. 444 */ 445 446 if (bitset(EF_QUEUERUN, e->e_flags) || OpMode == MD_SMTP) 447 realname = from; 448 if (realname == NULL || realname[0] == '\0') 449 { 450 extern char *username(); 451 452 realname = username(); 453 } 454 455 /* 456 SuprErrs = TRUE; 457 */ 458 delimchar = internal ? '\0' : ' '; 459 if (from == NULL || 460 parseaddr(from, &e->e_from, 1, delimchar, delimptr, e) == NULL) 461 { 462 /* log garbage addresses for traceback */ 463 # ifdef LOG 464 if (from != NULL && LogLevel > 2) 465 { 466 char *host = RealHostName; 467 468 if (host == NULL) 469 host = MyHostName; 470 syslog(LOG_NOTICE, 471 "from=%s unparseable, received from %s@%s", 472 from, realname, host); 473 } 474 # endif /* LOG */ 475 if (from != NULL) 476 SuprErrs = TRUE; 477 if (from == realname || 478 parseaddr(from = newstr(realname), &e->e_from, 1, ' ', NULL, e) == NULL) 479 { 480 SuprErrs = TRUE; 481 if (parseaddr("postmaster", &e->e_from, 1, ' ', NULL, e) == NULL) 482 syserr("553 setsender: can't even parse postmaster!"); 483 } 484 } 485 else 486 FromFlag = TRUE; 487 e->e_from.q_flags |= QDONTSEND; 488 if (tTd(45, 5)) 489 { 490 printf("setsender: QDONTSEND "); 491 printaddr(&e->e_from, FALSE); 492 } 493 SuprErrs = FALSE; 494 495 pvp = NULL; 496 if (e->e_from.q_mailer == LocalMailer) 497 { 498 # ifdef USERDB 499 register char *p; 500 extern char *udbsender(); 501 # endif 502 503 if (!internal) 504 { 505 /* if the user has given fullname already, don't redefine */ 506 if (FullName == NULL) 507 FullName = macvalue('x', e); 508 if (FullName != NULL && FullName[0] == '\0') 509 FullName = NULL; 510 511 # ifdef USERDB 512 p = udbsender(from); 513 514 if (p != NULL) 515 { 516 /* 517 ** We have an alternate address for the sender 518 */ 519 520 pvp = prescan(p, '\0', pvpbuf, NULL); 521 } 522 # endif /* USERDB */ 523 } 524 525 if ((pw = getpwnam(e->e_from.q_user)) != NULL) 526 { 527 /* 528 ** Process passwd file entry. 529 */ 530 531 532 /* extract home directory */ 533 e->e_from.q_home = newstr(pw->pw_dir); 534 define('z', e->e_from.q_home, e); 535 536 /* extract user and group id */ 537 e->e_from.q_uid = pw->pw_uid; 538 e->e_from.q_gid = pw->pw_gid; 539 540 /* extract full name from passwd file */ 541 if (FullName == NULL && pw->pw_gecos != NULL && 542 strcmp(pw->pw_name, e->e_from.q_user) == 0 && 543 !internal) 544 { 545 buildfname(pw->pw_gecos, e->e_from.q_user, buf); 546 if (buf[0] != '\0') 547 FullName = newstr(buf); 548 } 549 } 550 if (FullName != NULL && !internal) 551 define('x', FullName, e); 552 } 553 else if (!internal) 554 { 555 if (e->e_from.q_home == NULL) 556 e->e_from.q_home = getenv("HOME"); 557 e->e_from.q_uid = getuid(); 558 e->e_from.q_gid = getgid(); 559 } 560 561 /* 562 ** Rewrite the from person to dispose of possible implicit 563 ** links in the net. 564 */ 565 566 if (pvp == NULL) 567 pvp = prescan(from, '\0', pvpbuf, NULL); 568 if (pvp == NULL) 569 { 570 /* don't need to give error -- prescan did that already */ 571 # ifdef LOG 572 if (LogLevel > 2) 573 syslog(LOG_NOTICE, "cannot prescan from (%s)", from); 574 # endif 575 finis(); 576 } 577 rewrite(pvp, 3); 578 rewrite(pvp, 1); 579 rewrite(pvp, 4); 580 cataddr(pvp, buf, sizeof buf, '\0'); 581 e->e_sender = newstr(buf); 582 define('f', e->e_sender, e); 583 584 /* save the domain spec if this mailer wants it */ 585 if (!internal && e->e_from.q_mailer != NULL && 586 bitnset(M_CANONICAL, e->e_from.q_mailer->m_flags)) 587 { 588 extern char **copyplist(); 589 590 while (*pvp != NULL && strcmp(*pvp, "@") != 0) 591 pvp++; 592 if (*pvp != NULL) 593 e->e_fromdomain = copyplist(pvp, TRUE); 594 } 595 } 596