git.marmaro.de Git - mmh/blob - uip/spost.c

   1 /*
   2 ** spost.c -- feed messages to sendmail
   3 **
   4 ** This is a simpler, faster, replacement for "post" for use
   5 ** when "sendmail" is the transport system.
   6 **
   7 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   8 ** COPYRIGHT file in the root directory of the nmh distribution for
   9 ** complete copyright information.
  10 */
  11
  12 #include <h/mh.h>
  13 #include <signal.h>
  14 #include <h/addrsbr.h>
  15 #include <h/aliasbr.h>
  16 #include <h/dropsbr.h>
  17 #include <h/tws.h>
  18 #include <h/utils.h>
  19
  20 #define MAX_SM_FIELD 1476  /* < largest hdr field sendmail will accept */
  21 #define FCCS 10  /* max number of fccs allowed */
  22
  23 struct swit switches[] = {
  24 #define VERBSW  0
  25         { "verbose", 0 },
  26 #define NVERBSW  1
  27         { "noverbose", 0 },
  28 #define WATCSW  2
  29         { "watch", 0 },
  30 #define NWATCSW  3
  31         { "nowatch", 0 },
  32 #define ALIASW  4
  33         { "alias aliasfile", 0 },
  34 #define NALIASW  5
  35         { "noalias", 0 },
  36 #define VERSIONSW  6
  37         { "version", 0 },
  38 #define HELPSW  7
  39         { "help", 0 },
  40 #define DEBUGSW  8
  41         { "debug", -5 },
  42 #define DISTSW  9
  43         { "dist", -4 },  /* interface from dist */
  44 #define PUSHSW  10  /* fork to sendmail then exit */
  45         { "push", -4 },
  46 #define NPUSHSW  11  /* exec sendmail */
  47         { "nopush", -6 },
  48 #define LIBSW  12
  49         { "library directory", -7 },
  50         { NULL, 0 }
  51 };
  52
  53
  54 /* flags for headers->flags */
  55 #define HNOP  0x0000  /* just used to keep .set around */
  56 #define HBAD  0x0001  /* bad header - don't let it through */
  57 #define HADR  0x0002  /* header has an address field */
  58 #define HSUB  0x0004  /* Subject: header */
  59 #define HTRY  0x0008  /* try to send to addrs on header */
  60 #define HBCC  0x0010  /* don't output this header */
  61 #define HNGR  0x0020  /* no groups allowed in this header */
  62 #define HFCC  0x0040  /* FCC: type header */
  63 #define HNIL  0x0080  /* okay for this header not to have addrs */
  64 #define HIGN  0x0100  /* ignore this header */
  65
  66 /* flags for headers->set */
  67 #define MFRM  0x0001  /* we've seen a From: */
  68 #define MDAT  0x0002  /* we've seen a Date: */
  69 #define MRFM  0x0004  /* we've seen a Resent-From: */
  70 #define MVIS  0x0008  /* we've seen sighted addrs */
  71 #define MINV  0x0010  /* we've seen blind addrs */
  72 #define MRDT  0x0020  /* we've seen a Resent-Date: */
  73
  74 struct headers {
  75         char *value;
  76         unsigned int flags;
  77         unsigned int set;
  78 };
  79
  80
  81 static struct headers NHeaders[] = {
  82         { "Return-Path", HBAD, 0 },
  83         { "Received", HBAD, 0 },
  84         { "Reply-To", HADR|HNGR, 0 },
  85         { "From", HADR|HNGR, MFRM },
  86         { "Sender", HADR|HBAD, 0 },
  87         { "Date", HNOP, MDAT },
  88         { "Subject", HSUB, 0 },
  89         { "To", HADR|HTRY, MVIS },
  90         { "Cc", HADR|HTRY, MVIS },
  91         { "Bcc", HADR|HTRY|HBCC|HNIL, MINV },
  92         { "Message-Id", HBAD, 0 },
  93         { "Fcc", HFCC, 0 },
  94         { NULL, 0, 0 }
  95 };
  96
  97 static struct headers RHeaders[] = {
  98         { "Resent-Reply-To",   HADR|HNGR, 0 },
  99         { "Resent-From", HADR|HNGR, MRFM },
 100         { "Resent-Sender", HADR|HBAD, 0 },
 101         { "Resent-Date", HNOP, MRDT },
 102         { "Resent-Subject", HSUB, 0 },
 103         { "Resent-To", HADR|HTRY, MVIS },
 104         { "Resent-Cc", HADR|HTRY, MVIS },
 105         { "Resent-Bcc", HADR|HTRY|HBCC, MINV },
 106         { "Resent-Message-Id", HBAD, 0 },
 107         { "Resent-Fcc", HFCC, 0 },
 108         { "Reply-To", HADR, 0 },
 109         { "Fcc", HIGN, 0 },
 110         { NULL, 0, 0 }
 111 };
 112
 113
 114 static int badmsg = 0;  /* message has bad semantics */
 115 static int verbose = 0;  /* spell it out */
 116 static int debug = 0;  /* debugging post */
 117 static int watch = 0;  /* watch the delivery process */
 118 static int pushflg = 0;  /* if going to fork to sendmail */
 119 static int aliasflg = 0;  /* if going to process aliases */
 120
 121 static unsigned msgflags = 0;  /* what we've seen */
 122
 123 static enum {
 124         normal, resent
 125 } msgstate = normal;
 126
 127 static char tmpfil[] = "/tmp/spost-XXXXXX";
 128 static char bccfil[] = "/tmp/spost-bcc-XXXXXX";
 129
 130 static char *subject = NULL;  /* the subject field for BCC'ing */
 131 static char fccs[BUFSIZ] = "";
 132 struct mailname *bccs = NULL;
 133
 134 static struct headers *hdrtab;  /* table for the message we're doing */
 135 static FILE *out;  /* output (temp) file */
 136
 137 extern char *sendmail;
 138
 139 /*
 140 ** static prototypes
 141 */
 142 static void putfmt(char *, char *, FILE *);
 143 static void finish_headers(FILE *);
 144 static int get_header(char *, struct headers *);
 145 static void putadr(char *, struct mailname *);
 146 static int putone(char *, int, int);
 147 static void fcc(char *, char *);
 148 static void make_bcc_draft(char *);
 149
 150
 151 int
 152 main(int argc, char **argv)
 153 {
 154         int state, i, pid, compnum;
 155         char *cp, *msg = NULL, **argp, **arguments;
 156         char *sargv[16], buf[BUFSIZ], name[NAMESZ];
 157         FILE *in;
 158
 159 #ifdef LOCALE
 160         setlocale(LC_ALL, "");
 161 #endif
 162         invo_name = mhbasename(argv[0]);
 163
 164         /* foil search of user profile/context */
 165         if (context_foil(NULL) == -1)
 166                 done(1);
 167
 168         arguments = getarguments(invo_name, argc, argv, 0);
 169         argp = arguments;
 170
 171         while ((cp = *argp++)) {
 172                 if (*cp == '-') {
 173                         switch (smatch(++cp, switches)) {
 174                         case AMBIGSW:
 175                                 ambigsw(cp, switches);
 176                                 done(1);
 177                         case UNKWNSW:
 178                                 adios(NULL, "-%s unknown", cp);
 179
 180                         case HELPSW:
 181                                 snprintf(buf, sizeof(buf),
 182                                                 "%s [switches] file",
 183                                                 invo_name);
 184                                 print_help(buf, switches, 1);
 185                                 done(1);
 186                         case VERSIONSW:
 187                                 print_version(invo_name);
 188                                 done(1);
 189
 190                         case DEBUGSW:
 191                                 debug++;
 192                                 continue;
 193
 194                         case DISTSW:
 195                                 msgstate = resent;
 196                                 continue;
 197
 198                         case VERBSW:
 199                                 verbose++;
 200                                 continue;
 201                         case NVERBSW:
 202                                 verbose = 0;
 203                                 continue;
 204
 205                         case WATCSW:
 206                                 watch++;
 207                                 continue;
 208                         case NWATCSW:
 209                                 watch = 0;
 210                                 continue;
 211
 212                         case PUSHSW:
 213                                 pushflg++;
 214                                 continue;
 215                         case NPUSHSW:
 216                                 pushflg = 0;
 217                                 continue;
 218
 219                         case ALIASW:
 220                                 if (!(cp = *argp++) || *cp == '-')
 221                                         adios(NULL, "missing argument to %s",
 222                                                         argp[-2]);
 223                                 aliasflg = 1;
 224                                 if ((state = alias(cp)) != AK_OK)
 225                                         adios(NULL, "aliasing error in file %s - %s", cp, akerror(state));
 226                                 continue;
 227                         case NALIASW:
 228                                 aliasflg = 0;
 229                                 continue;
 230
 231                         case LIBSW:
 232                                 if (!(cp = *argp++) || *cp == '-')
 233                                         adios(NULL, "missing argument to %s",
 234                                                         argp[-2]);
 235                                 /* create a minimal context */
 236                                 if (context_foil(cp) == -1)
 237                                         done(1);
 238                                 continue;
 239                         }
 240                 }
 241                 if (msg)
 242                         adios(NULL, "only one message at a time!");
 243                 else
 244                         msg = cp;
 245         }
 246
 247         if (!msg)
 248                 adios(NULL, "usage: %s [switches] file", invo_name);
 249
 250         if ((in = fopen(msg, "r")) == NULL)
 251                 adios(msg, "unable to open");
 252
 253         if (debug) {
 254                 verbose++;
 255                 out = stdout;
 256         } else {
 257 #ifdef HAVE_MKSTEMP
 258                 if ((out = fdopen(mkstemp(tmpfil), "w")) == NULL)
 259                         adios(tmpfil, "unable to create");
 260 #else
 261                 mktemp(tmpfil);
 262                 if ((out = fopen(tmpfil, "w")) == NULL)
 263                         adios(tmpfil, "unable to create");
 264                 chmod(tmpfil, 0600);
 265 #endif
 266         }
 267
 268         hdrtab = (msgstate == normal) ? NHeaders : RHeaders;
 269
 270         for (compnum = 1, state = FLD;;) {
 271                 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
 272                 case FLD:
 273                         compnum++;
 274                         putfmt(name, buf, out);
 275                         continue;
 276
 277                 case FLDPLUS:
 278                         compnum++;
 279                         cp = add(buf, cp);
 280                         while (state == FLDPLUS) {
 281                                 state = m_getfld(state, name, buf,
 282                                                 sizeof(buf), in);
 283                                 cp = add(buf, cp);
 284                         }
 285                         putfmt(name, cp, out);
 286                         free(cp);
 287                         continue;
 288
 289                 case BODY:
 290                         finish_headers(out);
 291                         fprintf(out, "\n%s", buf);
 292                         while (state == BODY) {
 293                                 state = m_getfld(state, name, buf,
 294                                                 sizeof(buf), in);
 295                                 fputs(buf, out);
 296                         }
 297                         break;
 298
 299                 case FILEEOF:
 300                         finish_headers(out);
 301                         break;
 302
 303                 case LENERR:
 304                 case FMTERR:
 305                         adios(NULL, "message format error in component #%d",
 306                                         compnum);
 307
 308                 default:
 309                         adios(NULL, "getfld() returned %d", state);
 310                 }
 311                 break;
 312         }
 313         fclose(in);
 314
 315         if (debug) {
 316                 /* stop here */
 317                 done(0);
 318         }
 319
 320         fclose(out);
 321
 322         /* process Fcc */
 323         if (*fccs) {
 324                 fcc(tmpfil, fccs);
 325         }
 326
 327         /* process Bcc */
 328         if (bccs) {
 329                 make_bcc_draft(tmpfil);
 330         }
 331
 332         /*
 333         ** re-open the temp file, unlink it and exec sendmail, giving it
 334         ** the msg temp file as std in.
 335         */
 336         if (!freopen(tmpfil, "r", stdin)) {
 337                 adios(tmpfil, "can't reopen for sendmail");
 338         }
 339         unlink(tmpfil);
 340
 341         argp = sargv;
 342         *argp++ = "send-mail";
 343         *argp++ = "-m";  /* send to me too */
 344         *argp++ = "-t";  /* read msg for recipients */
 345         *argp++ = "-i";  /* don't stop on "." */
 346         if (watch || verbose) {
 347                 *argp++ = "-v";
 348                 pushflg = 0;
 349         }
 350         *argp = NULL;
 351
 352         if (pushflg) {
 353                 /* fork to a child to run sendmail */
 354                 for (i=0; (pid = fork()) == NOTOK && i < 5; i++)
 355                         sleep(5);
 356                 switch (pid) {
 357                 case NOTOK:
 358                         fprintf(verbose ? stdout : stderr,
 359                                         "%s: can't fork to %s\n",
 360                                         invo_name, sendmail);
 361                         exit(-1);
 362                 case OK:
 363                         /* we're the child .. */
 364                         break;
 365                 default:
 366                         exit(0);
 367                 }
 368         }
 369
 370         if (0 /*bccs*/) {
 371                 /* fork to a child to run sendmail */
 372                 for (i=0; (pid = fork()) == NOTOK && i < 5; i++)
 373                         sleep(5);
 374                 switch (pid) {
 375                 case NOTOK:
 376                         fprintf(verbose ? stdout : stderr,
 377                                         "%s: can't fork to %s\n",
 378                                         invo_name, sendmail);
 379                         exit(-1);
 380                 case OK:
 381                         /* we're the child .. */
 382                         exit(0);
 383                 default:
 384                         exit(0);
 385                 }
 386         }
 387
 388         execv(sendmail, sargv);
 389         adios(sendmail, "can't exec");
 390         return 0;  /* dead code to satisfy the compiler */
 391 }
 392
 393 /* DRAFT GENERATION */
 394
 395 static void
 396 putfmt(char *name, char *str, FILE *out)
 397 {
 398         int i;
 399         char *cp, *pp;
 400         struct headers *hdr;
 401
 402         while (*str == ' ' || *str == '\t')
 403                 str++;
 404
 405         if ((i = get_header(name, hdrtab)) == NOTOK) {
 406                 /* some boring header: push it through */
 407                 fprintf(out, "%s: %s", name, str);
 408                 return;
 409         }
 410         /* one of the interesting headers */
 411         hdr = &hdrtab[i];
 412
 413         if (hdr->flags & HIGN) {
 414                 return;
 415         }
 416         if (hdr->flags & HBAD) {
 417                 advise(NULL, "illegal header line -- %s:", name);
 418                 badmsg++;
 419                 return;
 420         }
 421         msgflags |= hdr->set;
 422
 423         if (hdr->flags & HSUB) {
 424                 if (subject) {
 425                         /* concatenate mupliple subject */
 426                         char *cp = concat(subject, "\t", str, NULL);
 427                         free(subject);
 428                         subject = cp;
 429                 } else {
 430                         subject = getcpy(str);
 431                 }
 432         }
 433
 434         if (hdr->flags & HFCC) {
 435                 if (strlen(str)+strlen(fccs) > sizeof fccs /2) {
 436                         adios(NULL, "Too much Fcc data");
 437                 }
 438                 /* todo: better have three states: SEPARATOR, PLUS, WORD */
 439                 int state = 0;
 440                 for (cp=pp=str; *cp; cp++) {
 441                         switch (*cp) {
 442                         case ' ':
 443                         case '\t':
 444                         case '\n':
 445                         case ',':
 446                                 if (state != 0) {
 447                                         state = 0;
 448                                         *cp = '\0';
 449                                         if (*pp=='+' || *pp=='@') {
 450                                                 strcat(fccs, " ");
 451                                         } else {
 452                                                 strcat(fccs, " +");
 453                                         }
 454                                         strcat(fccs, pp);
 455                                 }
 456                                 break;
 457                         default:
 458                                 if (state == 0) {
 459                                         state = 1;
 460                                         pp = cp;
 461                                 }
 462                                 break;
 463                         }
 464                 }
 465                 return;
 466         }
 467
 468         if (*str != '\n' && *str != '\0') {
 469                 if (hdr->flags & HBCC) {
 470                         struct mailname *mp = NULL;
 471
 472                         /* Create list of Bcc adds. */
 473                         while ((cp = getname(str))) {
 474                                 mp = getm(cp, NULL, 0, AD_HOST, NULL);
 475                                 mp->m_next = bccs;  /* push */
 476                                 bccs = mp;
 477                         }
 478                 } else if (aliasflg && hdr->flags & HTRY) {
 479                         /*
 480                         ** this header contains address(es) that we have to do
 481                         ** alias expansion on.  Because of the saved state in
 482                         ** getname we have to put all the addresses into a
 483                         ** list. We then let putadr munch on that list,
 484                         ** possibly expanding aliases.
 485                         **/
 486                         register struct mailname *f = 0;
 487                         register struct mailname *mp = 0;
 488
 489                         while ((cp = getname(str))) {
 490                                 mp = getm(cp, NULL, 0, AD_HOST, NULL);
 491                                 if (f == 0) {
 492                                         f = mp;
 493                                         mp->m_next = mp;
 494                                 } else {
 495                                         mp->m_next = f->m_next;
 496                                         f->m_next = mp;
 497                                         f = mp;
 498                                 }
 499                         }
 500                         f = mp->m_next; mp->m_next = 0;
 501                         putadr(name, f);
 502                 } else {
 503                         /*
 504                         ** The author(s) of spost decided that alias
 505                         ** substitution wasn't necessary for the non-HTRY
 506                         ** headers.  Unfortunately, one of those headers
 507                         ** is "From:", and having alias substitution
 508                         ** work on that is extremely useful for someone
 509                         ** with a lot of POP3 email accounts or aliases.
 510                         ** post supports aliasing of "From:"...
 511                         **
 512                         ** Since "From:"-processing is incompletely
 513                         ** implemented in this unsupported and
 514                         ** undocumented spost backend, I'm not
 515                         ** going to take the time to implement my new
 516                         ** draft-From:-based email address masquerading.
 517                         ** If I do ever implement it here, I'd almost
 518                         ** certainly want to implement "From:" line
 519                         ** alias processing as well.
 520                         ** -- Dan Harkless <dan-nmh@dilvish.speed.net>
 521                         */
 522                         fprintf(out, "%s: %s", name, str);
 523                 }
 524         }
 525 }
 526
 527
 528 /*
 529 ** Add yet missing headers.
 530 */
 531 static void
 532 finish_headers(FILE *out)
 533 {
 534         char *cp;
 535         char from[BUFSIZ];  /* my network address */
 536         char signature[BUFSIZ];  /* my signature */
 537         char *resentstr = (msgstate == resent) ? "Resent-" : "";
 538
 539         if (!(msgflags & MDAT)) {
 540                 fprintf(out, "%sDate: %s\n", resentstr, dtimenow(0));
 541         }
 542
 543         strncpy(from, getusername(), sizeof(from));
 544         if ((cp = getfullname()) && *cp) {
 545                 snprintf(signature, sizeof(signature), "%s <%s>", cp, from);
 546         } else {
 547                 snprintf(signature, sizeof(signature), "%s", from);
 548         }
 549         if (!(msgflags & MFRM)) {
 550                 fprintf(out, "%sFrom: %s\n", resentstr, signature);
 551         } else {
 552                 /* In case the From: header contains multiple addresses. */
 553                 fprintf(out, "%sSender: %s\n", resentstr, from);
 554         }
 555         if (!(msgflags & MVIS)) {
 556                 fprintf(out, "%sBcc: Blind Distribution List: ;\n", resentstr);
 557         }
 558         if (badmsg) {
 559                 adios(NULL, "re-format message and try again");
 560         }
 561 }
 562
 563
 564 /*
 565 ** Return index of the requested header in the table, or NOTOK if missing.
 566 */
 567 static int
 568 get_header(char *header, struct headers *table)
 569 {
 570         struct headers *h;
 571
 572         for (h=table; h->value; h++) {
 573                 if (mh_strcasecmp(header, h->value)==0) {
 574                         return (h - table);
 575                 }
 576         }
 577
 578         return NOTOK;
 579 }
 580
 581
 582 /*
 583 ** output the address list for header "name".  The address list
 584 ** is a linked list of mailname structs.  "nl" points to the head
 585 ** of the list.  Alias substitution should be done on nl.
 586 */
 587 static void
 588 putadr(char *name, struct mailname *nl)
 589 {
 590         struct mailname *mp, *mp2;
 591         int linepos;
 592         char *cp;
 593         int namelen;
 594
 595         fprintf(out, "%s: ", name);
 596         namelen = strlen(name) + 2;
 597         linepos = namelen;
 598
 599         for (mp = nl; mp; ) {
 600                 if (linepos > MAX_SM_FIELD) {
 601                         fprintf(out, "\n%s: ", name);
 602                         linepos = namelen;
 603                 }
 604                 if (mp->m_nohost) {
 605                         /* a local name - see if it's an alias */
 606                         cp = akvalue(mp->m_mbox);
 607                         if (cp == mp->m_mbox) {
 608                                 /* wasn't an alias - use what the user typed */
 609                                 linepos = putone(mp->m_text, linepos, namelen);
 610                         } else {
 611                                 /* an alias - expand it */
 612                                 while ((cp = getname(cp))) {
 613                                         if (linepos > MAX_SM_FIELD) {
 614                                                 fprintf(out, "\n%s: ", name);
 615                                                 linepos = namelen;
 616                                         }
 617                                         mp2 = getm(cp, NULL, 0, AD_HOST, NULL);
 618                                         if (akvisible()) {
 619                                                 mp2->m_pers = getcpy(mp->m_mbox);
 620                                                 linepos = putone(adrformat(mp2), linepos, namelen);
 621                                         } else {
 622                                                 linepos = putone(mp2->m_text,
 623                                                                 linepos,
 624                                                                 namelen);
 625                                         }
 626                                         mnfree(mp2);
 627                                 }
 628                         }
 629                 } else {
 630                         /* not a local name - use what the user typed */
 631                         linepos = putone(mp->m_text, linepos, namelen);
 632                 }
 633                 mp2 = mp;
 634                 mp = mp->m_next;
 635                 mnfree(mp2);
 636         }
 637         putc('\n', out);
 638 }
 639
 640 static int
 641 putone(char *adr, int pos, int indent)
 642 {
 643         register int len;
 644         static int linepos;
 645
 646         len = strlen(adr);
 647         if (pos == indent)
 648                 linepos = pos;
 649         else if (linepos+len > OUTPUTLINELEN) {
 650                 fprintf(out, ",\n%*s", indent, "");
 651                 linepos = indent;
 652                 pos += indent + 2;
 653         } else {
 654                 fputs(", ", out);
 655                 linepos += 2;
 656                 pos += 2;
 657         }
 658         fputs(adr, out);
 659
 660         linepos += len;
 661         return (pos+len);
 662 }
 663
 664
 665 static void
 666 fcc(char *file, char *folders)
 667 {
 668         int status;
 669         char cmd[BUFSIZ];
 670
 671         if (verbose) {
 672                 printf("%sFcc: %s\n", msgstate == resent ? "Resent-" : "",
 673                                 folders);
 674                 fflush(stdout);
 675         }
 676         if (strlen(fileproc)+strlen(file)+strlen(folders)+100 > sizeof cmd) {
 677                 adios(NULL, "Too much Fcc data");
 678         }
 679         /* hack: read from /dev/null and refile(1) won't question us */
 680         snprintf(cmd, sizeof cmd, "</dev/null %s -link -file %s %s",
 681                         fileproc, file, folders);
 682         status = system(cmd);
 683         if (status == -1) {
 684                 fprintf(stderr, "Skipped %sFcc %s: unable to system().\n",
 685                                 msgstate == resent ? "Resent-" : "", folders);
 686         } else if (status != 0) {
 687                 fprintf(stderr, "%sFcc %s: Problems occured.\n",
 688                                 msgstate == resent ? "Resent-" : "", folders);
 689         }
 690 }
 691
 692
 693 /* BCC GENERATION */
 694
 695 static void
 696 make_bcc_draft(char *draft)
 697 {
 698         int fd;
 699         FILE *out;
 700
 701 #ifdef HAVE_MKSTEMP
 702         fd = mkstemp(bccfil);
 703         if (fd == -1 || (out = fdopen(fd, "w")) == NULL)
 704                 adios(bccfil, "unable to create");
 705 #else
 706         mktemp(bccfil);
 707         if ((out = fopen(bccfil, "w")) == NULL)
 708                 adios(bccfil, "unable to create");
 709 #endif
 710         chmod(bccfil, 0600);
 711
 712         if (subject) {
 713                 fprintf(out, "Subject: BCC: %s", subject);
 714         } else {
 715                 fprintf(out, "Subject: BCC: message without subject");
 716         }
 717         fprintf(out, "%s: %s\n", attach_hdr, draft);
 718         fprintf(out, "------------\n");
 719         fclose(out);
 720 }