main.c

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 /* TODO longjmp() globbering as in cmd1.c and cmd3.c (see there)
  41  * TODO Problem: Popen doesn't encapsulate all cases of open failures,
  42  * TODO may leave child running if fdopen() fails! */
  43
  44 /*
  45  * Most strcpy/sprintf functions have been changed to strncpy/snprintf to
  46  * correct several buffer overruns (at least one ot them was exploitable).
  47  * Sat Jun 20 04:58:09 CEST 1998 Alvaro Martinez Echevarria <alvaro@lander.es>
  48  * ---
  49  * Note: We set egid to realgid ... and only if we need the egid we will
  50  *       switch back temporary.  Nevertheless, I do not like seg faults.
  51  *       Werner Fink, <werner@suse.de>
  52  */
  53
  54
  55 #include "config.h"
  56 #ifdef  HAVE_NL_LANGINFO
  57 #include <langinfo.h>
  58 #endif  /* HAVE_NL_LANGINFO */
  59 #define _MAIL_GLOBS_
  60 #include "rcv.h"
  61 #include "extern.h"
  62 #include <sys/stat.h>
  63 #include <sys/ioctl.h>
  64 #include <termios.h>
  65 #include <unistd.h>
  66 #include <fcntl.h>
  67 #ifdef  HAVE_SETLOCALE
  68 #include <locale.h>
  69 #endif  /* HAVE_SETLOCALE */
  70
  71 /*
  72  * Mail -- a mail program
  73  *
  74  * Startup -- interface with user.
  75  */
  76
  77 static sigjmp_buf       hdrjmp;
  78 char    *progname;
  79 sighandler_type dflpipe = SIG_DFL;
  80
  81 static void hdrstop(int signo);
  82 static void setscreensize(int dummy);
  83
  84 int
  85 main(int argc, char *argv[])
  86 {
  87         const char optstr[] = "A:BHEFINVT:RS:a:b:c:dDefh:inqr:s:tu:v~O:";
  88         int scnt, i, existonly = 0, headersonly = 0, sendflag = 0;
  89         struct name *to, *cc, *bcc, *smopts;
  90         struct attachment *attach;
  91         char *subject, *cp, *ef, *qf = NULL, *fromaddr = NULL, *Aflag = NULL;
  92         char nosrc = 0;
  93         int Eflag = 0, Fflag = 0, Nflag = 0, tflag = 0;
  94         sighandler_type prevint;
  95
  96         (void)&Nflag;
  97         /*
  98          * Absolutely the first thing we do is save our egid
  99          * and set it to the rgid, so that we can safely run
 100          * setgid.  We use the sgid (saved set-gid) to allow ourselves
 101          * to revert to the egid if we want (temporarily) to become
 102          * priveliged.
 103          */
 104         effectivegid = getegid();
 105         realgid = getgid();
 106         if (setgid(realgid) < 0) {
 107                 perror("setgid");
 108                 exit(1);
 109         }
 110
 111         starting = 1;
 112         progname = strrchr(argv[0], '/');
 113         if (progname != NULL)
 114                 progname++;
 115         else
 116                 progname = argv[0];
 117         /*
 118          * Set up a reasonable environment.
 119          * Figure out whether we are being run interactively,
 120          * start the SIGCHLD catcher, and so forth.
 121          */
 122         safe_signal(SIGCHLD, sigchild);
 123         is_a_tty[0] = isatty(0);
 124         is_a_tty[1] = isatty(1);
 125         if (is_a_tty[0]) {
 126                 assign("interactive", "");
 127                 if (is_a_tty[1])
 128                         safe_signal(SIGPIPE, dflpipe = SIG_IGN);
 129         }
 130         assign("header", "");
 131         assign("save", "");
 132 #ifdef  HAVE_SETLOCALE
 133         setlocale(LC_CTYPE, "");
 134         setlocale(LC_COLLATE, "");
 135         setlocale(LC_MESSAGES, "");
 136         mb_cur_max = MB_CUR_MAX;
 137 #if defined (HAVE_NL_LANGINFO) && defined (CODESET)
 138         if (value("ttycharset") == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 139                 assign("ttycharset", cp);
 140 #endif  /* HAVE_NL_LANGINFO && CODESET */
 141 #if defined (HAVE_MBTOWC) && defined (HAVE_WCTYPE_H)
 142         if (mb_cur_max > 1) {
 143                 wchar_t wc;
 144                 if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 145                                 mbtowc(&wc, "\342\202\254", 3) == 3 &&
 146                                 wc == 0x20AC)
 147                         utf8 = 1;
 148         }
 149 #endif  /* HAVE_MBTOWC && HAVE_WCTYPE_H */
 150 #else   /* !HAVE_SETLOCALE */
 151         mb_cur_max = 1;
 152 #endif  /* !HAVE_SETLOCALE */
 153 #ifdef  HAVE_CATGETS
 154 #ifdef  NL_CAT_LOCALE
 155         i = NL_CAT_LOCALE;
 156 #else
 157         i = 0;
 158 #endif
 159         catd = catopen(CATNAME, i);
 160 #endif  /* HAVE_CATGETS */
 161 #ifdef  HAVE_ICONV
 162         iconvd = (iconv_t) -1;
 163 #endif
 164         image = -1;
 165         /*
 166          * Now, determine how we are being used.
 167          * We successively pick off - flags.
 168          * If there is anything left, it is the base of the list
 169          * of users to mail to.  Argp will be set to point to the
 170          * first of these users.
 171          */
 172         ef = NULL;
 173         to = NULL;
 174         cc = NULL;
 175         bcc = NULL;
 176         attach = NULL;
 177         smopts = NULL;
 178         subject = NULL;
 179         scnt = 0;
 180         while ((i = getopt(argc, argv, optstr)) != EOF) {
 181                 switch (i) {
 182                 case 'V':
 183                         puts(version);
 184                         exit(0);
 185                         /*NOTREACHED*/
 186                 case 'B':
 187                         setvbuf(stdin, NULL, _IOLBF, 0);
 188                         setvbuf(stdout, NULL, _IOLBF, 0);
 189                         break;
 190                 case 'H':
 191                         headersonly = 1;
 192                         break;
 193                 case 'E':
 194                         Eflag = 1;
 195                         break;
 196                 case 'F':
 197                         Fflag = 1;
 198                         sendflag++;
 199                         break;
 200                 case 'S':
 201                         argv[scnt++] = optarg;
 202                         break;
 203                 case 'T':
 204                         /*
 205                          * Next argument is temp file to write which
 206                          * articles have been read/deleted for netnews.
 207                          */
 208                         Tflag = optarg;
 209                         if ((i = creat(Tflag, 0600)) < 0) {
 210                                 perror(Tflag);
 211                                 exit(1);
 212                         }
 213                         close(i);
 214                         /*FALLTHRU*/
 215                 case 'I':
 216                         /*
 217                          * Show Newsgroups: field in header summary
 218                          */
 219                         Iflag = 1;
 220                         break;
 221                 case 'u':
 222                         /*
 223                          * Next argument is person to pretend to be.
 224                          */
 225                         uflag = myname = optarg;
 226                         break;
 227                 case 'i':
 228                         /*
 229                          * User wants to ignore interrupts.
 230                          * Set the variable "ignore"
 231                          */
 232                         assign("ignore", "");
 233                         break;
 234                 case 'd':
 235                         debug++;
 236                         break;
 237                 case 'D':
 238                         assign("disconnected", "");
 239                         break;
 240                 case 'e':
 241                         existonly++;
 242                         break;
 243                 case 's':
 244                         /*
 245                          * Give a subject field for sending from
 246                          * non terminal
 247                          */
 248                         subject = optarg;
 249                         sendflag++;
 250                         break;
 251                 case 'f':
 252                         /*
 253                          * User is specifying file to "edit" with Mail,
 254                          * as opposed to reading system mailbox.
 255                          * If no argument is given, we read his
 256                          * mbox file.
 257                          *
 258                          * Check for remaining arguments later.
 259                          */
 260                         ef = "&";
 261                         break;
 262                 case 'q':
 263                         /*
 264                          * User is specifying file to quote in front of
 265                          * the mail to be collected.
 266                          */
 267                         if ((argv[optind]) && (argv[optind][0] != '-'))
 268                                 qf = argv[optind++];
 269                         else
 270                                 qf = NULL;
 271                         sendflag++;
 272                         break;
 273                 case 'n':
 274                         /*
 275                          * User doesn't want to source /usr/lib/Mail.rc
 276                          */
 277                         nosrc++;
 278                         break;
 279                 case 'N':
 280                         /*
 281                          * Avoid initial header printing.
 282                          */
 283                         Nflag = 1;
 284                         unset_internal("header");
 285                         break;
 286                 case 'v':
 287                         /*
 288                          * Send mailer verbose flag
 289                          */
 290                         assign("verbose", "");
 291                         break;
 292                 case 'r':
 293                         /*
 294                          * Set From address.
 295                          * MTA is only interested in plain address so strip
 296                          * anything else (but still give user the option to
 297                          * simply pass a fully fledged email address)
 298                          */
 299                         i = count(smopts);
 300                         fromaddr = optarg;
 301                         smopts = cat(smopts, nalloc("-r", 0));
 302                         smopts = cat(smopts, sextract(optarg, GFULL));
 303                         if (count(smopts) != i + 2) {
 304                                 fprintf(stderr, tr(271,
 305                                         "More than one address "
 306                                         "given with -r\n"));
 307                                 goto usage;
 308                         }
 309                         tildeflag = -1;
 310                         sendflag++;
 311                         break;
 312                 case 'a':
 313                         /*
 314                          * Get attachment filenames
 315                          */
 316                         attach = add_attachment(attach, optarg, 0);
 317                         if (attach == NULL) {
 318                                 perror(optarg);
 319                                 exit(1);
 320                         }
 321                         sendflag++;
 322                         break;
 323                 case 'c':
 324                         /*
 325                          * Get Carbon Copy Recipient list
 326                          */
 327                         cc = checkaddrs(cat(cc, sextract(optarg, GCC|GFULL)));
 328                         sendflag++;
 329                         break;
 330                 case 'b':
 331                         /*
 332                          * Get Blind Carbon Copy Recipient list
 333                          */
 334                         bcc = checkaddrs(cat(bcc,
 335                                 sextract(optarg, GBCC|GFULL)));
 336                         sendflag++;
 337                         break;
 338                 case 'h':
 339                         /*
 340                          * Hop count for sendmail
 341                          */
 342                         smopts = cat(smopts, nalloc("-h", 0));
 343                         smopts = cat(smopts, nalloc(optarg, 0));
 344                         sendflag++;
 345                         break;
 346                 case 'O':
 347                         /*
 348                          * Additional options to pass-through to MTA
 349                          */
 350                         smopts = cat(smopts, nalloc(optarg, 0));
 351                         sendflag++;
 352                         break;
 353                 case '~':
 354                         if (tildeflag == 0)
 355                                 tildeflag = 1;
 356                         break;
 357                 case 't':
 358                         sendflag = 1;
 359                         tflag = 1;
 360                         break;
 361                 case 'A':
 362                         Aflag = optarg;
 363                         break;
 364                 case 'R':
 365                         Rflag = 1;
 366                         break;
 367                 case '?':
 368 usage:
 369                         fprintf(stderr, tr(135,
 370 "Usage: %s -eiIUdEFntBDNHRV~ -T FILE -u USER -O MTAARG -h hops -r address -s SUBJECT -a FILE -q FILE -f FILE -A ACCOUNT -b USERS -c USERS -S OPTION users\n"), progname);
 371                         exit(2);
 372                 }
 373         }
 374         if (ef != NULL) {
 375                 if (optind < argc) {
 376                         if (optind + 1 < argc) {
 377                                 fprintf(stderr, catgets(catd, CATSET, 205,
 378                                         "More than one file given with -f\n"));
 379                                 goto usage;
 380                         }
 381                         ef = argv[optind];
 382                 }
 383         } else {
 384                 for (i = optind; argv[i]; i++)
 385                         to = checkaddrs(cat(to, extract(argv[i], GTO|GFULL)));
 386         }
 387         /*
 388          * Check for inconsistent arguments.
 389          */
 390         if (ef != NULL && to != NULL) {
 391                 fprintf(stderr, catgets(catd, CATSET, 137,
 392                         "Cannot give -f and people to send to.\n"));
 393                 goto usage;
 394         }
 395         if (sendflag && !tflag && to == NULL) {
 396                 fprintf(stderr, catgets(catd, CATSET, 138,
 397                         "Send options without primary recipient specified.\n"));
 398                 goto usage;
 399         }
 400         if (Rflag && to != NULL) {
 401                 fprintf(stderr, "The -R option is meaningless in send mode.\n");
 402                 goto usage;
 403         }
 404         if (Iflag && ef == NULL) {
 405                 fprintf(stderr, catgets(catd, CATSET, 204,
 406                                         "Need -f with -I.\n"));
 407                 goto usage;
 408         }
 409         tinit();
 410         setscreensize(0);
 411 #ifdef  SIGWINCH
 412         if (value("interactive"))
 413                 if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 414                         safe_signal(SIGWINCH, setscreensize);
 415 #endif  /* SIGWINCH */
 416         input = stdin;
 417         rcvmode = !to && !tflag;
 418         spreserve();
 419         if (!nosrc)
 420                 load(MAILRC);
 421         /*
 422          * Expand returns a savestr, but load only uses the file name
 423          * for fopen, so it's safe to do this.
 424          */
 425         if ((cp = getenv("MAILRC")) != NULL)
 426                 load(expand(cp));
 427         else if ((cp = getenv("NAILRC")) != NULL)
 428                 load(expand(cp));
 429         else
 430                 load(expand("~/.mailrc"));
 431         if (getenv("NAIL_EXTRA_RC") == NULL &&
 432                         (cp = value("NAIL_EXTRA_RC")) != NULL)
 433                 load(expand(cp));
 434         /*
 435          * Now we can set the account.
 436          */
 437         if (Aflag) {
 438                 char    *a[2];
 439                 a[0] = Aflag;
 440                 a[1] = NULL;
 441                 account(a);
 442         }
 443         /*
 444          * Override 'skipemptybody' if '-E' flag was given.
 445          */
 446         if (Eflag)
 447                 assign("skipemptybody", "");
 448         /*
 449          * -S arguments override rc files.
 450          */
 451         for (i = 0; i < scnt; ++i) {
 452                 char *a[2];
 453                 a[0] = argv[i];
 454                 a[1] = NULL;
 455                 set(a);
 456         }
 457
 458         starting = 0;
 459
 460         /*
 461          * From address from command line overrides rc files.
 462          */
 463         if (fromaddr)
 464                 assign("from", fromaddr);
 465         if (!rcvmode) {
 466                 mail(to, cc, bcc, smopts, subject, attach, qf, Fflag, tflag,
 467                     Eflag);
 468                 /*
 469                  * why wait?
 470                  */
 471                 exit(senderr ? 1 : 0);
 472         }
 473         /*
 474          * Ok, we are reading mail.
 475          * Decide whether we are editing a mailbox or reading
 476          * the system mailbox, and open up the right stuff.
 477          */
 478         if (ef == NULL)
 479                 ef = "%";
 480         else if (*ef == '@') {
 481                 /*
 482                  * This must be treated specially to make invocation like
 483                  * -A imap -f @mailbox work.
 484                  */
 485                 if ((cp = value("folder")) != NULL &&
 486                                 which_protocol(cp) == PROTO_IMAP)
 487                         strncpy(mailname, cp, PATHSIZE)[PATHSIZE-1] = '\0';
 488         }
 489         i = setfile(ef, 0);
 490         if (i < 0)
 491                 exit(1);                /* error already reported */
 492         if (existonly)
 493                 exit(i);
 494         if (headersonly) {
 495                 if (mb.mb_type == MB_IMAP)
 496                         imap_getheaders(1, msgCount);
 497                 for (i = 1; i <= msgCount; i++)
 498                         printhead(i, stdout, 0);
 499                 exit(exit_status);
 500         }
 501         callhook(mailname, 0);
 502         if (i > 0 && value("emptystart") == NULL)
 503                 exit(1);
 504         if (sigsetjmp(hdrjmp, 1) == 0) {
 505                 if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 506                         safe_signal(SIGINT, hdrstop);
 507                 if (Nflag == 0) {
 508                         if (value("quiet") == NULL)
 509                                 printf(catgets(catd, CATSET, 140,
 510                                         "%s version %s.  "
 511                                         "Type ? for help.\n"),
 512                                         value("bsdcompat") ? "Mail" : uagent,
 513                                         version);
 514                         announce(1);
 515                         fflush(stdout);
 516                 }
 517                 safe_signal(SIGINT, prevint);
 518         }
 519         commands();
 520         if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 521                 safe_signal(SIGHUP, SIG_IGN);
 522                 safe_signal(SIGINT, SIG_IGN);
 523                 safe_signal(SIGQUIT, SIG_IGN);
 524         }
 525         strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
 526         quit();
 527         return exit_status;
 528 }
 529
 530 /*
 531  * Interrupt printing of the headers.
 532  */
 533 /*ARGSUSED*/
 534 static void
 535 hdrstop(int signo)
 536 {
 537         (void)signo;
 538
 539         fflush(stdout);
 540         fprintf(stderr, catgets(catd, CATSET, 141, "\nInterrupt\n"));
 541         siglongjmp(hdrjmp, 1);
 542 }
 543
 544 /*
 545  * Compute what the screen size for printing headers should be.
 546  * We use the following algorithm for the height:
 547  *      If baud rate < 1200, use  9
 548  *      If baud rate = 1200, use 14
 549  *      If baud rate > 1200, use 24 or ws_row
 550  * Width is either 80 or ws_col;
 551  */
 552 /*ARGSUSED*/
 553 static void
 554 setscreensize(int dummy)
 555 {
 556         struct termios tbuf;
 557 #ifdef  TIOCGWINSZ
 558         struct winsize ws;
 559 #endif
 560         speed_t ospeed;
 561         (void)dummy;
 562
 563 #ifdef  TIOCGWINSZ
 564         if (ioctl(1, TIOCGWINSZ, &ws) < 0)
 565                 ws.ws_col = ws.ws_row = 0;
 566 #endif
 567         if (tcgetattr(1, &tbuf) < 0)
 568                 ospeed = B9600;
 569         else
 570                 ospeed = cfgetospeed(&tbuf);
 571         if (ospeed < B1200)
 572                 scrnheight = 9;
 573         else if (ospeed == B1200)
 574                 scrnheight = 14;
 575 #ifdef  TIOCGWINSZ
 576         else if (ws.ws_row != 0)
 577                 scrnheight = ws.ws_row;
 578 #endif
 579         else
 580                 scrnheight = 24;
 581 #ifdef  TIOCGWINSZ
 582         if ((realscreenheight = ws.ws_row) == 0)
 583                 realscreenheight = 24;
 584 #endif
 585 #ifdef  TIOCGWINSZ
 586         if ((scrnwidth = ws.ws_col) == 0)
 587 #endif
 588                 scrnwidth = 80;
 589 }