main.c

   1 /*
   2  * Heirloom mailx - 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  * All rights reserved.
   7  */
   8 /*
   9  * Copyright (c) 1980, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 #ifdef  DOSCCS
  43 static char copyright[]
  44 = "@(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.\n";
  45 static char sccsid[] = "@(#)main.c      2.51 (gritter) 10/1/07";
  46 #endif  /* DOSCCS */
  47 #endif /* not lint */
  48
  49 /*
  50  * Most strcpy/sprintf functions have been changed to strncpy/snprintf to
  51  * correct several buffer overruns (at least one ot them was exploitable).
  52  * Sat Jun 20 04:58:09 CEST 1998 Alvaro Martinez Echevarria <alvaro@lander.es>
  53  * ---
  54  * Note: We set egid to realgid ... and only if we need the egid we will
  55  *       switch back temporary.  Nevertheless, I do not like seg faults.
  56  *       Werner Fink, <werner@suse.de>
  57  */
  58
  59
  60 #include "config.h"
  61 #ifdef  HAVE_NL_LANGINFO
  62 #include <langinfo.h>
  63 #endif  /* HAVE_NL_LANGINFO */
  64 #define _MAIL_GLOBS_
  65 #include "rcv.h"
  66 #include "extern.h"
  67 #include <sys/stat.h>
  68 #include <sys/ioctl.h>
  69 #include <termios.h>
  70 #include <unistd.h>
  71 #include <fcntl.h>
  72 #ifdef  HAVE_SETLOCALE
  73 #include <locale.h>
  74 #endif  /* HAVE_SETLOCALE */
  75
  76 /*
  77  * Mail -- a mail program
  78  *
  79  * Startup -- interface with user.
  80  */
  81
  82 static sigjmp_buf       hdrjmp;
  83 char    *progname;
  84 sighandler_type dflpipe = SIG_DFL;
  85
  86 static void hdrstop(int signo);
  87 static void setscreensize(int dummy);
  88
  89 int
  90 main(int argc, char *argv[])
  91 {
  92         const char optstr[] = "A:BHEFINVT:RS:a:b:c:dDefh:inqr:s:tu:v~O:";
  93         int i, existonly = 0, headersonly = 0, sendflag = 0;
  94         struct name *to, *cc, *bcc, *smopts;
  95         struct attachment *attach;
  96         char *subject, *cp, *ef, *qf = NULL, *fromaddr = NULL, *Aflag = NULL;
  97         char nosrc = 0;
  98         int Eflag = 0, Fflag = 0, Nflag = 0, tflag = 0;
  99         sighandler_type prevint;
 100
 101         (void)&Nflag;
 102         /*
 103          * Absolutely the first thing we do is save our egid
 104          * and set it to the rgid, so that we can safely run
 105          * setgid.  We use the sgid (saved set-gid) to allow ourselves
 106          * to revert to the egid if we want (temporarily) to become
 107          * priveliged.
 108          */
 109         effectivegid = getegid();
 110         realgid = getgid();
 111         if (setgid(realgid) < 0) {
 112                 perror("setgid");
 113                 exit(1);
 114         }
 115
 116         starting = 1;
 117         progname = strrchr(argv[0], '/');
 118         if (progname != NULL)
 119                 progname++;
 120         else
 121                 progname = argv[0];
 122         /*
 123          * Set up a reasonable environment.
 124          * Figure out whether we are being run interactively,
 125          * start the SIGCHLD catcher, and so forth.
 126          */
 127         safe_signal(SIGCHLD, sigchild);
 128         is_a_tty[0] = isatty(0);
 129         is_a_tty[1] = isatty(1);
 130         if (is_a_tty[0]) {
 131                 assign("interactive", "");
 132                 if (is_a_tty[1])
 133                         safe_signal(SIGPIPE, dflpipe = SIG_IGN);
 134         }
 135         assign("header", "");
 136         assign("save", "");
 137 #ifdef  HAVE_SETLOCALE
 138         setlocale(LC_CTYPE, "");
 139         setlocale(LC_COLLATE, "");
 140         setlocale(LC_MESSAGES, "");
 141         mb_cur_max = MB_CUR_MAX;
 142 #if defined (HAVE_NL_LANGINFO) && defined (CODESET)
 143         if (value("ttycharset") == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 144                 assign("ttycharset", cp);
 145 #endif  /* HAVE_NL_LANGINFO && CODESET */
 146 #if defined (HAVE_MBTOWC) && defined (HAVE_WCTYPE_H)
 147         if (mb_cur_max > 1) {
 148                 wchar_t wc;
 149                 if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 150                                 mbtowc(&wc, "\342\202\254", 3) == 3 &&
 151                                 wc == 0x20AC)
 152                         utf8 = 1;
 153         }
 154 #endif  /* HAVE_MBTOWC && HAVE_WCTYPE_H */
 155 #else   /* !HAVE_SETLOCALE */
 156         mb_cur_max = 1;
 157 #endif  /* !HAVE_SETLOCALE */
 158 #ifdef  HAVE_CATGETS
 159 #ifdef  NL_CAT_LOCALE
 160         i = NL_CAT_LOCALE;
 161 #else
 162         i = 0;
 163 #endif
 164         catd = catopen(CATNAME, i);
 165 #endif  /* HAVE_CATGETS */
 166 #ifdef  HAVE_ICONV
 167         iconvd = (iconv_t) -1;
 168 #endif
 169         image = -1;
 170         /*
 171          * Now, determine how we are being used.
 172          * We successively pick off - flags.
 173          * If there is anything left, it is the base of the list
 174          * of users to mail to.  Argp will be set to point to the
 175          * first of these users.
 176          */
 177         ef = NULL;
 178         to = NULL;
 179         cc = NULL;
 180         bcc = NULL;
 181         attach = NULL;
 182         smopts = NULL;
 183         subject = NULL;
 184         while ((i = getopt(argc, argv, optstr)) != EOF) {
 185                 switch (i) {
 186                 case 'V':
 187                         puts(version);
 188                         exit(0);
 189                         /*NOTREACHED*/
 190                 case 'B':
 191                         setvbuf(stdin, NULL, _IOLBF, 0);
 192                         setvbuf(stdout, NULL, _IOLBF, 0);
 193                         break;
 194                 case 'H':
 195                         headersonly = 1;
 196                         break;
 197                 case 'E':
 198                         Eflag = 1;
 199                         break;
 200                 case 'F':
 201                         Fflag = 1;
 202                         sendflag++;
 203                         break;
 204                 case 'S': {
 205                                 char *args[] = { NULL, NULL };
 206                                 args[0] = optarg;
 207                                 set(args);
 208                         }
 209                         break;
 210                 case 'T':
 211                         /*
 212                          * Next argument is temp file to write which
 213                          * articles have been read/deleted for netnews.
 214                          */
 215                         Tflag = optarg;
 216                         if ((i = creat(Tflag, 0600)) < 0) {
 217                                 perror(Tflag);
 218                                 exit(1);
 219                         }
 220                         close(i);
 221                         /*FALLTHRU*/
 222                 case 'I':
 223                         /*
 224                          * Show Newsgroups: field in header summary
 225                          */
 226                         Iflag = 1;
 227                         break;
 228                 case 'u':
 229                         /*
 230                          * Next argument is person to pretend to be.
 231                          */
 232                         uflag = myname = optarg;
 233                         break;
 234                 case 'i':
 235                         /*
 236                          * User wants to ignore interrupts.
 237                          * Set the variable "ignore"
 238                          */
 239                         assign("ignore", "");
 240                         break;
 241                 case 'd':
 242                         debug++;
 243                         break;
 244                 case 'D':
 245                         assign("disconnected", "");
 246                         break;
 247                 case 'e':
 248                         existonly++;
 249                         break;
 250                 case 's':
 251                         /*
 252                          * Give a subject field for sending from
 253                          * non terminal
 254                          */
 255                         subject = optarg;
 256                         sendflag++;
 257                         break;
 258                 case 'f':
 259                         /*
 260                          * User is specifying file to "edit" with Mail,
 261                          * as opposed to reading system mailbox.
 262                          * If no argument is given, we read his
 263                          * mbox file.
 264                          *
 265                          * Check for remaining arguments later.
 266                          */
 267                         ef = "&";
 268                         break;
 269                 case 'q':
 270                         /*
 271                          * User is specifying file to quote in front of
 272                          * the mail to be collected.
 273                          */
 274                         if ((argv[optind]) && (argv[optind][0] != '-'))
 275                                 qf = argv[optind++];
 276                         else
 277                                 qf = NULL;
 278                         sendflag++;
 279                         break;
 280                 case 'n':
 281                         /*
 282                          * User doesn't want to source /usr/lib/Mail.rc
 283                          */
 284                         nosrc++;
 285                         break;
 286                 case 'N':
 287                         /*
 288                          * Avoid initial header printing.
 289                          */
 290                         Nflag = 1;
 291                         unset_internal("header");
 292                         break;
 293                 case 'v':
 294                         /*
 295                          * Send mailer verbose flag
 296                          */
 297                         assign("verbose", "");
 298                         break;
 299                 case 'r':
 300                         /*
 301                          * Set From address.
 302                          */
 303                         fromaddr = optarg;
 304                         smopts = cat(smopts, nalloc("-r", 0));
 305                         smopts = cat(smopts, nalloc(optarg, 0));
 306                         tildeflag = -1;
 307                         sendflag++;
 308                         break;
 309                 case 'a':
 310                         /*
 311                          * Get attachment filenames
 312                          */
 313                         attach = add_attachment(attach, optarg, 0);
 314                         if (attach == NULL) {
 315                                 perror(optarg);
 316                                 exit(1);
 317                         }
 318                         sendflag++;
 319                         break;
 320                 case 'c':
 321                         /*
 322                          * Get Carbon Copy Recipient list
 323                          */
 324                         cc = checkaddrs(cat(cc, extract(optarg, GCC|GFULL)));
 325                         sendflag++;
 326                         break;
 327                 case 'b':
 328                         /*
 329                          * Get Blind Carbon Copy Recipient list
 330                          */
 331                         bcc = checkaddrs(cat(bcc, extract(optarg, GBCC|GFULL)));
 332                         sendflag++;
 333                         break;
 334                 case 'h':
 335                         /*
 336                          * Hop count for sendmail
 337                          */
 338                         smopts = cat(smopts, nalloc("-h", 0));
 339                         smopts = cat(smopts, nalloc(optarg, 0));
 340                         sendflag++;
 341                         break;
 342                 case 'O':
 343                         /*
 344                          * Additional options to pass-through to MTA
 345                          */
 346                         smopts = cat(smopts, nalloc(optarg, 0));
 347                         sendflag++;
 348                         break;
 349                 case '~':
 350                         if (tildeflag == 0)
 351                                 tildeflag = 1;
 352                         break;
 353                 case 't':
 354                         sendflag = 1;
 355                         tflag = 1;
 356                         break;
 357                 case 'A':
 358                         Aflag = optarg;
 359                         break;
 360                 case 'R':
 361                         Rflag = 1;
 362                         break;
 363                 case '?':
 364 usage:
 365                         fprintf(stderr, catgets(catd, CATSET, 135,
 366 "Usage: %s -eiIUdEFntBDNHRV~ -T FILE -u USER -h hops -r address -s SUBJECT -a FILE -q FILE -f FILE -A ACCOUNT -b USERS -c USERS -S OPTION users\n"), progname);
 367                         exit(2);
 368                 }
 369         }
 370         if (ef != NULL) {
 371                 if (optind < argc) {
 372                         if (optind + 1 < argc) {
 373                                 fprintf(stderr, catgets(catd, CATSET, 205,
 374                                         "More than one file given with -f\n"));
 375                                 goto usage;
 376                         }
 377                         ef = argv[optind];
 378                 }
 379         } else {
 380                 for (i = optind; argv[i]; i++)
 381                         to = checkaddrs(cat(to, extract(argv[i], GTO|GFULL)));
 382         }
 383         /*
 384          * Check for inconsistent arguments.
 385          */
 386         if (ef != NULL && to != NULL) {
 387                 fprintf(stderr, catgets(catd, CATSET, 137,
 388                         "Cannot give -f and people to send to.\n"));
 389                 goto usage;
 390         }
 391         if (sendflag && !tflag && to == NULL) {
 392                 fprintf(stderr, catgets(catd, CATSET, 138,
 393                         "Send options without primary recipient specified.\n"));
 394                 goto usage;
 395         }
 396         if (Rflag && to != NULL) {
 397                 fprintf(stderr, "The -R option is meaningless in send mode.\n");
 398                 goto usage;
 399         }
 400         if (Iflag && ef == NULL) {
 401                 fprintf(stderr, catgets(catd, CATSET, 204,
 402                                         "Need -f with -I.\n"));
 403                 goto usage;
 404         }
 405         tinit();
 406         setscreensize(0);
 407 #ifdef  SIGWINCH
 408         if (value("interactive"))
 409                 if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 410                         safe_signal(SIGWINCH, setscreensize);
 411 #endif  /* SIGWINCH */
 412         input = stdin;
 413         rcvmode = !to && !tflag;
 414         spreserve();
 415         if (!nosrc)
 416                 load(MAILRC);
 417         /*
 418          * Expand returns a savestr, but load only uses the file name
 419          * for fopen, so it's safe to do this.
 420          */
 421         if ((cp = getenv("MAILRC")) != NULL)
 422                 load(expand(cp));
 423         else if ((cp = getenv("SNAILRC")) != NULL)
 424                 load(expand(cp));
 425         else
 426                 load(expand("~/.mailrc"));
 427         if (getenv("SNAIL_EXTRA_RC") == NULL &&
 428                         (cp = value("SNAIL_EXTRA_RC")) != NULL)
 429                 load(expand(cp));
 430         /*
 431          * Now we can set the account.
 432          */
 433         if (Aflag) {
 434                 char    *a[2];
 435                 a[0] = Aflag;
 436                 a[1] = NULL;
 437                 account(a);
 438         }
 439
 440         /*
 441          * Override 'skipemptybody' if '-E' flag was given.
 442          */
 443         if (Eflag)
 444                 assign("skipemptybody", "");
 445
 446         starting = 0;
 447
 448         /*
 449          * From address from command line overrides rc files.
 450          */
 451         if (fromaddr)
 452                 assign("from", fromaddr);
 453         if (!rcvmode) {
 454                 mail(to, cc, bcc, smopts, subject, attach, qf, Fflag, tflag,
 455                     Eflag);
 456                 /*
 457                  * why wait?
 458                  */
 459                 exit(senderr ? 1 : 0);
 460         }
 461         /*
 462          * Ok, we are reading mail.
 463          * Decide whether we are editing a mailbox or reading
 464          * the system mailbox, and open up the right stuff.
 465          */
 466         if (ef == NULL)
 467                 ef = "%";
 468         else if (*ef == '@') {
 469                 /*
 470                  * This must be treated specially to make invocation like
 471                  * -A imap -f @mailbox work.
 472                  */
 473                 if ((cp = value("folder")) != NULL &&
 474                                 which_protocol(cp) == PROTO_IMAP)
 475                         strncpy(mailname, cp, PATHSIZE)[PATHSIZE-1] = '\0';
 476         }
 477         i = setfile(ef, 0);
 478         if (i < 0)
 479                 exit(1);                /* error already reported */
 480         if (existonly)
 481                 exit(i);
 482         if (headersonly) {
 483                 if (mb.mb_type == MB_IMAP)
 484                         imap_getheaders(1, msgCount);
 485                 for (i = 1; i <= msgCount; i++)
 486                         printhead(i, stdout, 0);
 487                 exit(exit_status);
 488         }
 489         callhook(mailname, 0);
 490         if (i > 0 && value("emptystart") == NULL)
 491                 exit(1);
 492         if (sigsetjmp(hdrjmp, 1) == 0) {
 493                 if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 494                         safe_signal(SIGINT, hdrstop);
 495                 if (Nflag == 0) {
 496                         if (value("quiet") == NULL)
 497                                 printf(catgets(catd, CATSET, 140,
 498                                         "%s version %s.  "
 499                                         "Type ? for help.\n"),
 500                                         value("bsdcompat") ? "Mail" : "S-nail",
 501                                         version);
 502                         announce(1);
 503                         fflush(stdout);
 504                 }
 505                 safe_signal(SIGINT, prevint);
 506         }
 507         commands();
 508         if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 509                 safe_signal(SIGHUP, SIG_IGN);
 510                 safe_signal(SIGINT, SIG_IGN);
 511                 safe_signal(SIGQUIT, SIG_IGN);
 512         }
 513         strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
 514         quit();
 515         return exit_status;
 516 }
 517
 518 /*
 519  * Interrupt printing of the headers.
 520  */
 521 /*ARGSUSED*/
 522 static void
 523 hdrstop(int signo)
 524 {
 525
 526         fflush(stdout);
 527         fprintf(stderr, catgets(catd, CATSET, 141, "\nInterrupt\n"));
 528         siglongjmp(hdrjmp, 1);
 529 }
 530
 531 /*
 532  * Compute what the screen size for printing headers should be.
 533  * We use the following algorithm for the height:
 534  *      If baud rate < 1200, use  9
 535  *      If baud rate = 1200, use 14
 536  *      If baud rate > 1200, use 24 or ws_row
 537  * Width is either 80 or ws_col;
 538  */
 539 /*ARGSUSED*/
 540 static void
 541 setscreensize(int dummy)
 542 {
 543         struct termios tbuf;
 544 #ifdef  TIOCGWINSZ
 545         struct winsize ws;
 546 #endif
 547         speed_t ospeed;
 548
 549 #ifdef  TIOCGWINSZ
 550         if (ioctl(1, TIOCGWINSZ, &ws) < 0)
 551                 ws.ws_col = ws.ws_row = 0;
 552 #endif
 553         if (tcgetattr(1, &tbuf) < 0)
 554                 ospeed = B9600;
 555         else
 556                 ospeed = cfgetospeed(&tbuf);
 557         if (ospeed < B1200)
 558                 scrnheight = 9;
 559         else if (ospeed == B1200)
 560                 scrnheight = 14;
 561 #ifdef  TIOCGWINSZ
 562         else if (ws.ws_row != 0)
 563                 scrnheight = ws.ws_row;
 564 #endif
 565         else
 566                 scrnheight = 24;
 567 #ifdef  TIOCGWINSZ
 568         if ((realscreenheight = ws.ws_row) == 0)
 569                 realscreenheight = 24;
 570 #endif
 571 #ifdef  TIOCGWINSZ
 572         if ((scrnwidth = ws.ws_col) == 0)
 573 #endif
 574                 scrnwidth = 80;
 575 }