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 /*
  41  * Most strcpy/sprintf functions have been changed to strncpy/snprintf to
  42  * correct several buffer overruns (at least one ot them was exploitable).
  43  * Sat Jun 20 04:58:09 CEST 1998 Alvaro Martinez Echevarria <alvaro@lander.es>
  44  * ---
  45  * Note: We set egid to realgid ... and only if we need the egid we will
  46  *       switch back temporary.  Nevertheless, I do not like seg faults.
  47  *       Werner Fink, <werner@suse.de>
  48  */
  49
  50
  51 #include "config.h"
  52 #ifdef  HAVE_NL_LANGINFO
  53 # include <langinfo.h>
  54 #endif
  55 #define _MAIL_GLOBS_
  56 #include "rcv.h"
  57 #include "extern.h"
  58 #include <sys/stat.h>
  59 #include <sys/ioctl.h>
  60 #include <termios.h>
  61 #include <unistd.h>
  62 #include <fcntl.h>
  63 #ifdef HAVE_SETLOCALE
  64 # include <locale.h>
  65 #endif
  66
  67 /*
  68  * Mail -- a mail program
  69  *
  70  * Startup -- interface with user.
  71  */
  72
  73 static sigjmp_buf       hdrjmp;
  74
  75 char            *progname;
  76 sighandler_type dflpipe = SIG_DFL;
  77
  78 static void hdrstop(int signo);
  79 static void setscreensize(int dummy);
  80
  81 int
  82 main(int argc, char *argv[])
  83 {
  84         const char optstr[] = "A:a:Bb:c:DdEeFfHIiNnO:q:Rr:S:s:T:tu:Vv~",
  85                 usagestr[] =
  86                 "Usage:\t%s [-BDdEFintv~] [-A acc] [-a attachment]\n"
  87                 "\t\t[-b bcc-addr] [-c cc-addr] [-O mtaopt [-O mtaopt-arg]]\n"
  88                 "\t\t[-q file] [-r from-addr] [-S var[=value]]\n"
  89                 "\t\t[-s subject] to-addr...\n"
  90                 "\t%s [-BDdEeHIiNnRv~] [-A acct]\n"
  91                 "\t\t[-S var[=value]] [-T name] -f [file]\n"
  92                 "\t%s [-BDdEeiNnRv~] [-A acc] [-S var[=value]] [-u user]\n";
  93
  94         int scnt, i;
  95         struct name *to, *cc, *bcc, *smopts;
  96         struct attachment *attach;
  97         char *cp, *subject, *ef, *qf, *fromaddr, *Aflag;
  98         char existonly, headersonly, sendflag, nosrc, Eflag, Fflag, tflag;
  99         char volatile Nflag;
 100         sighandler_type prevint;
 101
 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_ALL, "");
 139         mb_cur_max = MB_CUR_MAX;
 140 # if defined HAVE_NL_LANGINFO && defined CODESET
 141         if (value("ttycharset") == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 142                 assign("ttycharset", cp);
 143 # endif
 144 # if defined HAVE_MBTOWC && defined HAVE_WCTYPE_H
 145         if (mb_cur_max > 1) {
 146                 wchar_t wc;
 147                 if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 148                                 mbtowc(&wc, "\342\202\254", 3) == 3 &&
 149                                 wc == 0x20AC)
 150                         utf8 = 1;
 151         }
 152 # endif
 153 #else
 154         mb_cur_max = 1;
 155 #endif
 156 #ifdef HAVE_CATGETS
 157 # ifdef NL_CAT_LOCALE
 158         i = NL_CAT_LOCALE;
 159 # else
 160         i = 0;
 161 # endif
 162         catd = catopen(CATNAME, i);
 163 #endif
 164 #ifdef HAVE_ICONV
 165         iconvd = (iconv_t) -1;
 166 #endif
 167         image = -1;
 168         /*
 169          * Now, determine how we are being used.
 170          * We successively pick off - flags.
 171          * If there is anything left, it is the base of the list
 172          * of users to mail to.  Argp will be set to point to the
 173          * first of these users.
 174          */
 175         scnt = 0;
 176         to = cc = bcc = smopts = NULL;
 177         attach = NULL;
 178         subject = ef = qf = fromaddr = Aflag = NULL;
 179         existonly = headersonly = sendflag = nosrc =
 180         Eflag = Fflag = tflag = 0;
 181         Nflag = 0;
 182
 183         while ((i = getopt(argc, argv, optstr)) != EOF) {
 184                 switch (i) {
 185                 case 'A':
 186                         /* Execute an account command later on */
 187                         Aflag = optarg;
 188                         break;
 189                 case 'a':
 190                         /* Get attachment filenames */
 191                         attach = add_attachment(attach, optarg, 0);
 192                         if (attach == NULL) {
 193                                 perror(optarg);
 194                                 exit(1);
 195                         }
 196                         sendflag = 1;
 197                         break;
 198                 case 'B':
 199                         /* Make 0/1 line buffered */
 200                         setvbuf(stdin, NULL, _IOLBF, 0);
 201                         setvbuf(stdout, NULL, _IOLBF, 0);
 202                         break;
 203                 case 'b':
 204                         /* Get Blind Carbon Copy Recipient list */
 205                         bcc = cat(bcc, checkaddrs(lextract(optarg,GBCC|GFULL)));
 206                         sendflag = 1;
 207                         break;
 208                 case 'c':
 209                         /* Get Carbon Copy Recipient list */
 210                         cc = cat(cc, checkaddrs(lextract(optarg, GCC|GFULL)));
 211                         sendflag = 1;
 212                         break;
 213                 case 'D':
 214                         assign("disconnected", "");
 215                         break;
 216                 case 'd':
 217                         ++debug;
 218                         break;
 219                 case 'E':
 220                         Eflag = 1;
 221                         break;
 222                 case 'e':
 223                         existonly = 1;
 224                         break;
 225                 case 'F':
 226                         Fflag = 1;
 227                         sendflag = 1;
 228                         break;
 229                 case 'f':
 230                         /*
 231                          * User is specifying file to "edit" with Mail,
 232                          * as opposed to reading system mailbox.
 233                          * If no argument is given, we read his mbox file.
 234                          * Check for remaining arguments later.
 235                          */
 236                         ef = "&";
 237                         break;
 238                 case 'H':
 239                         headersonly = 1;
 240                         break;
 241 jIflag:         case 'I':
 242                         /* Show Newsgroups: field in header summary */
 243                         Iflag = 1;
 244                         break;
 245                 case 'i':
 246                         /* Ignore interrupts */
 247                         assign("ignore", "");
 248                         break;
 249                 case 'N':
 250                         /* Avoid initial header printing */
 251                         Nflag = 1;
 252                         unset_internal("header");
 253                         break;
 254                 case 'n':
 255                         /* Don't source "unspecified system start-up file" */
 256                         nosrc = 1;
 257                         break;
 258                 case 'O':
 259                         /* Additional options to pass-through to MTA */
 260                         smopts = cat(smopts, nalloc(optarg, 0));
 261                         sendflag = 1;
 262                         break;
 263                 case 'q':
 264                         /* Quote file TODO drop? -Q with real quote?? what ? */
 265                         if (*optarg != '-')
 266                                 qf = optarg;
 267                         sendflag = 1;
 268                         break;
 269                 case 'R':
 270                         /* Open folders read-only */
 271                         Rflag = 1;
 272                         break;
 273                 case 'r':
 274                         /* Set From address. */
 275                         i = count(smopts);
 276                         fromaddr = optarg;
 277                         smopts = cat(smopts, nalloc("-r", 0));
 278                         smopts = cat(smopts, lextract(optarg, GFULL));
 279                         if (count(smopts) != i + 2) {
 280                                 fprintf(stderr, tr(271,
 281                                         "More than one address "
 282                                         "given with -r\n"));
 283                                 goto usage;
 284                         }
 285                         tildeflag = -1;
 286                         sendflag = 1;
 287                         break;
 288                 case 'S':
 289                         /* Set variable (do so later, after RC loading..) */
 290                         argv[scnt++] = optarg;
 291                         /* TODO Also set -S directly (see TODO) */
 292                         {       char *a[2];
 293                                 a[0] = optarg;
 294                                 a[1] = NULL;
 295                                 set(a);
 296                         }
 297                         break;
 298                 case 's':
 299                         /* Subject: */
 300                         subject = optarg;
 301                         sendflag = 1;
 302                         break;
 303                 case 'T':
 304                         /*
 305                          * Next argument is temp file to write which
 306                          * articles have been read/deleted for netnews.
 307                          */
 308                         Tflag = optarg;
 309                         if ((i = creat(Tflag, 0600)) < 0) {
 310                                 perror(Tflag);
 311                                 exit(1);
 312                         }
 313                         close(i);
 314                         goto jIflag;
 315                 case 't':
 316                         /* Read defined set of headers from mail to be send */
 317                         sendflag = 1;
 318                         tflag = 1;
 319                         break;
 320                 case 'u':
 321                         /* Set user name to pretend to be  */
 322                         uflag = myname = optarg;
 323                         break;
 324                 case 'V':
 325                         puts(version);
 326                         exit(0);
 327                         /*NOTREACHED*/
 328                 case 'v':
 329                         /* Be verbose */
 330                         assign("verbose", "");
 331                         break;
 332                 case '~':
 333                         /* Enable tilde escapes even in non-interactive mode */
 334                         if (tildeflag == 0)
 335                                 tildeflag = 1;
 336                         break;
 337                 case '?':
 338 usage:                  fprintf(stderr, tr(135, usagestr),
 339                                 progname, progname, progname);
 340                         exit(2);
 341                 }
 342         }
 343
 344         if (ef != NULL) {
 345                 if (optind < argc) {
 346                         if (optind + 1 < argc) {
 347                                 fprintf(stderr, tr(205,
 348                                         "More than one file given with -f\n"));
 349                                 goto usage;
 350                         }
 351                         ef = argv[optind];
 352                 }
 353         } else {
 354                 for (i = optind; argv[i]; i++)
 355                         to = cat(to, checkaddrs(lextract(argv[i], GTO|GFULL)));
 356         }
 357
 358         /* Check for inconsistent arguments */
 359         if (ef != NULL && to != NULL) {
 360                 fprintf(stderr, tr(137,
 361                         "Cannot give -f and people to send to.\n"));
 362                 goto usage;
 363         }
 364         if (sendflag && !tflag && to == NULL) {
 365                 fprintf(stderr, tr(138,
 366                         "Send options without primary recipient specified.\n"));
 367                 goto usage;
 368         }
 369         if (Rflag && to != NULL) {
 370                 fprintf(stderr, "The -R option is meaningless in send mode.\n");
 371                 goto usage;
 372         }
 373         if (Iflag && ef == NULL) {
 374                 fprintf(stderr, tr(204, "Need -f with -I.\n"));
 375                 goto usage;
 376         }
 377
 378         tinit();
 379         setscreensize(0);
 380 #ifdef SIGWINCH
 381         if (value("interactive"))
 382                 if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 383                         safe_signal(SIGWINCH, setscreensize);
 384 #endif
 385         input = stdin;
 386         rcvmode = !to && !tflag;
 387         spreserve();
 388
 389         if (! nosrc)
 390                 load(SYSCONFRC);
 391         /*
 392          * Expand returns a savestr, but load only uses the file name
 393          * for fopen, so it's safe to do this.
 394          */
 395         if ((cp = getenv("MAILRC")) != NULL)
 396                 load(file_expand(cp));
 397         else if ((cp = getenv("NAILRC")) != NULL)
 398                 load(file_expand(cp));
 399         else
 400                 load(file_expand("~/.mailrc"));
 401         if (getenv("NAIL_EXTRA_RC") == NULL &&
 402                         (cp = value("NAIL_EXTRA_RC")) != NULL)
 403                 load(file_expand(cp));
 404
 405         /*
 406          * Now we can set the account.
 407          */
 408         if (Aflag) {
 409                 char    *a[2];
 410                 a[0] = Aflag;
 411                 a[1] = NULL;
 412                 account(a);
 413         }
 414         /*
 415          * Override 'skipemptybody' if '-E' flag was given.
 416          */
 417         if (Eflag)
 418                 assign("skipemptybody", "");
 419         /*
 420          * -S arguments override rc files.
 421          */
 422         for (i = 0; i < scnt; ++i) {
 423                 char *a[2];
 424                 a[0] = argv[i];
 425                 a[1] = NULL;
 426                 set(a);
 427         }
 428
 429         starting = 0;
 430
 431         /*
 432          * From address from command line overrides rc files.
 433          */
 434         if (fromaddr)
 435                 assign("from", fromaddr);
 436         if (!rcvmode) {
 437                 mail(to, cc, bcc, smopts, subject, attach, qf, Fflag, tflag,
 438                     Eflag);
 439                 /*
 440                  * why wait?
 441                  */
 442                 exit(senderr ? 1 : 0);
 443         }
 444         /*
 445          * Ok, we are reading mail.
 446          * Decide whether we are editing a mailbox or reading
 447          * the system mailbox, and open up the right stuff.
 448          */
 449         if (ef == NULL)
 450                 ef = "%";
 451         else if (*ef == '@') {
 452                 /*
 453                  * This must be treated specially to make invocation like
 454                  * -A imap -f @mailbox work.
 455                  */
 456                 if ((cp = value("folder")) != NULL &&
 457                                 which_protocol(cp) == PROTO_IMAP)
 458                         strncpy(mailname, cp, PATHSIZE)[PATHSIZE-1] = '\0';
 459         }
 460         i = setfile(ef, 0);
 461         if (i < 0)
 462                 exit(1);                /* error already reported */
 463         if (existonly)
 464                 exit(i);
 465         if (headersonly) {
 466                 if (mb.mb_type == MB_IMAP)
 467                         imap_getheaders(1, msgCount);
 468                 for (i = 1; i <= msgCount; i++)
 469                         printhead(i, stdout, 0);
 470                 exit(exit_status);
 471         }
 472         callhook(mailname, 0);
 473         if (i > 0 && value("emptystart") == NULL)
 474                 exit(1);
 475         if (sigsetjmp(hdrjmp, 1) == 0) {
 476                 if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 477                         safe_signal(SIGINT, hdrstop);
 478                 if (Nflag == 0) {
 479                         if (value("quiet") == NULL)
 480                                 printf(tr(140,
 481                                         "%s version %s.  Type ? for help.\n"),
 482                                         value("bsdcompat") ? "Mail" : uagent,
 483                                         version);
 484                         announce(1);
 485                         fflush(stdout);
 486                 }
 487                 safe_signal(SIGINT, prevint);
 488         }
 489         commands();
 490         if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 491                 safe_signal(SIGHUP, SIG_IGN);
 492                 safe_signal(SIGINT, SIG_IGN);
 493                 safe_signal(SIGQUIT, SIG_IGN);
 494         }
 495         strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
 496         quit();
 497         return exit_status;
 498 }
 499
 500 /*
 501  * Interrupt printing of the headers.
 502  */
 503 /*ARGSUSED*/
 504 static void
 505 hdrstop(int signo)
 506 {
 507         (void)signo;
 508
 509         fflush(stdout);
 510         fprintf(stderr, tr(141, "\nInterrupt\n"));
 511         siglongjmp(hdrjmp, 1);
 512 }
 513
 514 /*
 515  * Compute what the screen size for printing headers should be.
 516  * We use the following algorithm for the height:
 517  *      If baud rate < 1200, use  9
 518  *      If baud rate = 1200, use 14
 519  *      If baud rate > 1200, use 24 or ws_row
 520  * Width is either 80 or ws_col;
 521  */
 522 /*ARGSUSED*/
 523 static void
 524 setscreensize(int dummy)
 525 {
 526         struct termios tbuf;
 527 #ifdef  TIOCGWINSZ
 528         struct winsize ws;
 529 #endif
 530         speed_t ospeed;
 531         (void)dummy;
 532
 533 #ifdef  TIOCGWINSZ
 534         if (ioctl(1, TIOCGWINSZ, &ws) < 0)
 535                 ws.ws_col = ws.ws_row = 0;
 536 #endif
 537         if (tcgetattr(1, &tbuf) < 0)
 538                 ospeed = B9600;
 539         else
 540                 ospeed = cfgetospeed(&tbuf);
 541         if (ospeed < B1200)
 542                 scrnheight = 9;
 543         else if (ospeed == B1200)
 544                 scrnheight = 14;
 545 #ifdef  TIOCGWINSZ
 546         else if (ws.ws_row != 0)
 547                 scrnheight = ws.ws_row;
 548 #endif
 549         else
 550                 scrnheight = 24;
 551 #ifdef  TIOCGWINSZ
 552         if ((realscreenheight = ws.ws_row) == 0)
 553                 realscreenheight = 24;
 554 #endif
 555 #ifdef  TIOCGWINSZ
 556         if ((scrnwidth = ws.ws_col) == 0)
 557 #endif
 558                 scrnwidth = 80;
 559 }