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
  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
  70
  71 /*
  72  * Mail -- a mail program
  73  *
  74  * Startup -- interface with user.
  75  */
  76
  77 static sigjmp_buf       hdrjmp;
  78
  79 char            *progname;
  80 sighandler_type dflpipe = SIG_DFL;
  81
  82 static void hdrstop(int signo);
  83 static void setscreensize(int dummy);
  84
  85 int
  86 main(int argc, char *argv[])
  87 {
  88         const char optstr[] = "A:a:Bb:c:DdEeFfHIiNnO:q:Rr:S:s:T:tu:Vv~",
  89                 usagestr[] =
  90                 "Usage:\t%s [-BDdEFintv~] [-A acc] [-a attachment]\n"
  91                 "\t\t[-b bcc-addr] [-c cc-addr] [-O mtaopt [-O mtaopt-arg]]\n"
  92                 "\t\t[-q file] [-r from-addr] [-S var[=value]]\n"
  93                 "\t\t[-s subject] to-addr...\n"
  94                 "\t%s [-BDdEeHIiNnRv~] [-A acct]\n"
  95                 "\t\t[-S var[=value]] [-T name] -f [file]\n"
  96                 "\t%s [-BDdEeiNnRv~] [-A acc] [-S var[=value]] [-u user]\n";
  97
  98         int scnt, i;
  99         struct name *to, *cc, *bcc, *smopts;
 100         struct attachment *attach;
 101         char *cp, *subject, *ef, *qf, *fromaddr, *Aflag;
 102         char existonly, headersonly, sendflag, nosrc, Eflag, Fflag, tflag;
 103         char volatile Nflag;
 104         sighandler_type prevint;
 105
 106         /*
 107          * Absolutely the first thing we do is save our egid
 108          * and set it to the rgid, so that we can safely run
 109          * setgid.  We use the sgid (saved set-gid) to allow ourselves
 110          * to revert to the egid if we want (temporarily) to become
 111          * priveliged.
 112          */
 113         effectivegid = getegid();
 114         realgid = getgid();
 115         if (setgid(realgid) < 0) {
 116                 perror("setgid");
 117                 exit(1);
 118         }
 119
 120         starting = 1;
 121         progname = strrchr(argv[0], '/');
 122         if (progname != NULL)
 123                 progname++;
 124         else
 125                 progname = argv[0];
 126         /*
 127          * Set up a reasonable environment.
 128          * Figure out whether we are being run interactively,
 129          * start the SIGCHLD catcher, and so forth.
 130          */
 131         safe_signal(SIGCHLD, sigchild);
 132         is_a_tty[0] = isatty(0);
 133         is_a_tty[1] = isatty(1);
 134         if (is_a_tty[0]) {
 135                 assign("interactive", "");
 136                 if (is_a_tty[1])
 137                         safe_signal(SIGPIPE, dflpipe = SIG_IGN);
 138         }
 139         assign("header", "");
 140         assign("save", "");
 141 #ifdef  HAVE_SETLOCALE
 142         setlocale(LC_ALL, "");
 143         mb_cur_max = MB_CUR_MAX;
 144 # if defined HAVE_NL_LANGINFO && defined CODESET
 145         if (value("ttycharset") == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 146                 assign("ttycharset", cp);
 147 # endif
 148 # if defined HAVE_MBTOWC && defined HAVE_WCTYPE_H
 149         if (mb_cur_max > 1) {
 150                 wchar_t wc;
 151                 if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 152                                 mbtowc(&wc, "\342\202\254", 3) == 3 &&
 153                                 wc == 0x20AC)
 154                         utf8 = 1;
 155         }
 156 # endif
 157 #else
 158         mb_cur_max = 1;
 159 #endif
 160 #ifdef HAVE_CATGETS
 161 # ifdef NL_CAT_LOCALE
 162         i = NL_CAT_LOCALE;
 163 # else
 164         i = 0;
 165 # endif
 166         catd = catopen(CATNAME, i);
 167 #endif
 168 #ifdef HAVE_ICONV
 169         iconvd = (iconv_t) -1;
 170 #endif
 171         image = -1;
 172         /*
 173          * Now, determine how we are being used.
 174          * We successively pick off - flags.
 175          * If there is anything left, it is the base of the list
 176          * of users to mail to.  Argp will be set to point to the
 177          * first of these users.
 178          */
 179         scnt = 0;
 180         to = cc = bcc = smopts = NULL;
 181         attach = NULL;
 182         subject = ef = qf = fromaddr = Aflag = NULL;
 183         existonly = headersonly = sendflag = nosrc =
 184         Eflag = Fflag = tflag = 0;
 185         Nflag = 0;
 186
 187         while ((i = getopt(argc, argv, optstr)) != EOF) {
 188                 switch (i) {
 189                 case 'A':
 190                         /* Execute an account command later on */
 191                         Aflag = optarg;
 192                         break;
 193                 case 'a':
 194                         /* Get attachment filenames */
 195                         attach = add_attachment(attach, optarg, 0);
 196                         if (attach == NULL) {
 197                                 perror(optarg);
 198                                 exit(1);
 199                         }
 200                         sendflag = 1;
 201                         break;
 202                 case 'B':
 203                         /* Make 0/1 line buffered */
 204                         setvbuf(stdin, NULL, _IOLBF, 0);
 205                         setvbuf(stdout, NULL, _IOLBF, 0);
 206                         break;
 207                 case 'b':
 208                         /* Get Blind Carbon Copy Recipient list */
 209                         bcc = cat(bcc, checkaddrs(lextract(optarg,GBCC|GFULL)));
 210                         sendflag = 1;
 211                         break;
 212                 case 'c':
 213                         /* Get Carbon Copy Recipient list */
 214                         cc = cat(cc, checkaddrs(lextract(optarg, GCC|GFULL)));
 215                         sendflag = 1;
 216                         break;
 217                 case 'D':
 218                         assign("disconnected", "");
 219                         break;
 220                 case 'd':
 221                         ++debug;
 222                         break;
 223                 case 'E':
 224                         Eflag = 1;
 225                         break;
 226                 case 'e':
 227                         existonly = 1;
 228                         break;
 229                 case 'F':
 230                         Fflag = 1;
 231                         sendflag = 1;
 232                         break;
 233                 case 'f':
 234                         /*
 235                          * User is specifying file to "edit" with Mail,
 236                          * as opposed to reading system mailbox.
 237                          * If no argument is given, we read his mbox file.
 238                          * Check for remaining arguments later.
 239                          */
 240                         ef = "&";
 241                         break;
 242                 case 'H':
 243                         headersonly = 1;
 244                         break;
 245 jIflag:         case 'I':
 246                         /* Show Newsgroups: field in header summary */
 247                         Iflag = 1;
 248                         break;
 249                 case 'i':
 250                         /* Ignore interrupts */
 251                         assign("ignore", "");
 252                         break;
 253                 case 'N':
 254                         /* Avoid initial header printing */
 255                         Nflag = 1;
 256                         unset_internal("header");
 257                         break;
 258                 case 'n':
 259                         /* Don't source "unspecified system start-up file" */
 260                         nosrc = 1;
 261                         break;
 262                 case 'O':
 263                         /* Additional options to pass-through to MTA */
 264                         smopts = cat(smopts, nalloc(optarg, 0));
 265                         sendflag = 1;
 266                         break;
 267                 case 'q':
 268                         /* Quote file TODO drop? -Q with real quote?? what ? */
 269                         if (*optarg != '-')
 270                                 qf = optarg;
 271                         sendflag = 1;
 272                         break;
 273                 case 'R':
 274                         /* Open folders read-only */
 275                         Rflag = 1;
 276                         break;
 277                 case 'r':
 278                         /* Set From address. */
 279                         i = count(smopts);
 280                         fromaddr = optarg;
 281                         smopts = cat(smopts, nalloc("-r", 0));
 282                         smopts = cat(smopts, lextract(optarg, GFULL));
 283                         if (count(smopts) != i + 2) {
 284                                 fprintf(stderr, tr(271,
 285                                         "More than one address "
 286                                         "given with -r\n"));
 287                                 goto usage;
 288                         }
 289                         tildeflag = -1;
 290                         sendflag = 1;
 291                         break;
 292                 case 'S':
 293                         /* Set variable (do so later, after RC loading..) */
 294                         argv[scnt++] = optarg;
 295                         break;
 296                 case 's':
 297                         /* Subject: */
 298                         subject = optarg;
 299                         sendflag = 1;
 300                         break;
 301                 case 'T':
 302                         /*
 303                          * Next argument is temp file to write which
 304                          * articles have been read/deleted for netnews.
 305                          */
 306                         Tflag = optarg;
 307                         if ((i = creat(Tflag, 0600)) < 0) {
 308                                 perror(Tflag);
 309                                 exit(1);
 310                         }
 311                         close(i);
 312                         goto jIflag;
 313                 case 't':
 314                         /* Read defined set of headers from mail to be send */
 315                         sendflag = 1;
 316                         tflag = 1;
 317                         break;
 318                 case 'u':
 319                         /* Set user name to pretend to be  */
 320                         uflag = myname = optarg;
 321                         break;
 322                 case 'V':
 323                         puts(version);
 324                         exit(0);
 325                         /*NOTREACHED*/
 326                 case 'v':
 327                         /* Be verbose */
 328                         assign("verbose", "");
 329                         break;
 330                 case '~':
 331                         /* Enable tilde escapes even in non-interactive mode */
 332                         if (tildeflag == 0)
 333                                 tildeflag = 1;
 334                         break;
 335                 case '?':
 336 usage:                  fprintf(stderr, tr(135, usagestr),
 337                                 progname, progname, progname);
 338                         exit(2);
 339                 }
 340         }
 341
 342         if (ef != NULL) {
 343                 if (optind < argc) {
 344                         if (optind + 1 < argc) {
 345                                 fprintf(stderr, tr(205,
 346                                         "More than one file given with -f\n"));
 347                                 goto usage;
 348                         }
 349                         ef = argv[optind];
 350                 }
 351         } else {
 352                 for (i = optind; argv[i]; i++)
 353                         to = cat(to, checkaddrs(lextract(argv[i], GTO|GFULL)));
 354         }
 355
 356         /* Check for inconsistent arguments */
 357         if (ef != NULL && to != NULL) {
 358                 fprintf(stderr, tr(137,
 359                         "Cannot give -f and people to send to.\n"));
 360                 goto usage;
 361         }
 362         if (sendflag && !tflag && to == NULL) {
 363                 fprintf(stderr, tr(138,
 364                         "Send options without primary recipient specified.\n"));
 365                 goto usage;
 366         }
 367         if (Rflag && to != NULL) {
 368                 fprintf(stderr, "The -R option is meaningless in send mode.\n");
 369                 goto usage;
 370         }
 371         if (Iflag && ef == NULL) {
 372                 fprintf(stderr, tr(204, "Need -f with -I.\n"));
 373                 goto usage;
 374         }
 375
 376         tinit();
 377         setscreensize(0);
 378 #ifdef SIGWINCH
 379         if (value("interactive"))
 380                 if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 381                         safe_signal(SIGWINCH, setscreensize);
 382 #endif
 383         input = stdin;
 384         rcvmode = !to && !tflag;
 385         spreserve();
 386
 387         if (! nosrc)
 388                 load(SYSCONFRC);
 389         /*
 390          * Expand returns a savestr, but load only uses the file name
 391          * for fopen, so it's safe to do this.
 392          */
 393         if ((cp = getenv("MAILRC")) != NULL)
 394                 load(file_expand(cp));
 395         else if ((cp = getenv("NAILRC")) != NULL)
 396                 load(file_expand(cp));
 397         else
 398                 load(file_expand("~/.mailrc"));
 399         if (getenv("NAIL_EXTRA_RC") == NULL &&
 400                         (cp = value("NAIL_EXTRA_RC")) != NULL)
 401                 load(file_expand(cp));
 402
 403         /*
 404          * Now we can set the account.
 405          */
 406         if (Aflag) {
 407                 char    *a[2];
 408                 a[0] = Aflag;
 409                 a[1] = NULL;
 410                 account(a);
 411         }
 412         /*
 413          * Override 'skipemptybody' if '-E' flag was given.
 414          */
 415         if (Eflag)
 416                 assign("skipemptybody", "");
 417         /*
 418          * -S arguments override rc files.
 419          */
 420         for (i = 0; i < scnt; ++i) {
 421                 char *a[2];
 422                 a[0] = argv[i];
 423                 a[1] = NULL;
 424                 set(a);
 425         }
 426
 427         starting = 0;
 428
 429         /*
 430          * From address from command line overrides rc files.
 431          */
 432         if (fromaddr)
 433                 assign("from", fromaddr);
 434         if (!rcvmode) {
 435                 mail(to, cc, bcc, smopts, subject, attach, qf, Fflag, tflag,
 436                     Eflag);
 437                 /*
 438                  * why wait?
 439                  */
 440                 exit(senderr ? 1 : 0);
 441         }
 442         /*
 443          * Ok, we are reading mail.
 444          * Decide whether we are editing a mailbox or reading
 445          * the system mailbox, and open up the right stuff.
 446          */
 447         if (ef == NULL)
 448                 ef = "%";
 449         else if (*ef == '@') {
 450                 /*
 451                  * This must be treated specially to make invocation like
 452                  * -A imap -f @mailbox work.
 453                  */
 454                 if ((cp = value("folder")) != NULL &&
 455                                 which_protocol(cp) == PROTO_IMAP)
 456                         strncpy(mailname, cp, PATHSIZE)[PATHSIZE-1] = '\0';
 457         }
 458         i = setfile(ef, 0);
 459         if (i < 0)
 460                 exit(1);                /* error already reported */
 461         if (existonly)
 462                 exit(i);
 463         if (headersonly) {
 464                 if (mb.mb_type == MB_IMAP)
 465                         imap_getheaders(1, msgCount);
 466                 for (i = 1; i <= msgCount; i++)
 467                         printhead(i, stdout, 0);
 468                 exit(exit_status);
 469         }
 470         callhook(mailname, 0);
 471         if (i > 0 && value("emptystart") == NULL)
 472                 exit(1);
 473         if (sigsetjmp(hdrjmp, 1) == 0) {
 474                 if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 475                         safe_signal(SIGINT, hdrstop);
 476                 if (Nflag == 0) {
 477                         if (value("quiet") == NULL)
 478                                 printf(tr(140,
 479                                         "%s version %s.  Type ? for help.\n"),
 480                                         value("bsdcompat") ? "Mail" : uagent,
 481                                         version);
 482                         announce(1);
 483                         fflush(stdout);
 484                 }
 485                 safe_signal(SIGINT, prevint);
 486         }
 487         commands();
 488         if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 489                 safe_signal(SIGHUP, SIG_IGN);
 490                 safe_signal(SIGINT, SIG_IGN);
 491                 safe_signal(SIGQUIT, SIG_IGN);
 492         }
 493         strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
 494         quit();
 495         return exit_status;
 496 }
 497
 498 /*
 499  * Interrupt printing of the headers.
 500  */
 501 /*ARGSUSED*/
 502 static void
 503 hdrstop(int signo)
 504 {
 505         (void)signo;
 506
 507         fflush(stdout);
 508         fprintf(stderr, tr(141, "\nInterrupt\n"));
 509         siglongjmp(hdrjmp, 1);
 510 }
 511
 512 /*
 513  * Compute what the screen size for printing headers should be.
 514  * We use the following algorithm for the height:
 515  *      If baud rate < 1200, use  9
 516  *      If baud rate = 1200, use 14
 517  *      If baud rate > 1200, use 24 or ws_row
 518  * Width is either 80 or ws_col;
 519  */
 520 /*ARGSUSED*/
 521 static void
 522 setscreensize(int dummy)
 523 {
 524         struct termios tbuf;
 525 #ifdef  TIOCGWINSZ
 526         struct winsize ws;
 527 #endif
 528         speed_t ospeed;
 529         (void)dummy;
 530
 531 #ifdef  TIOCGWINSZ
 532         if (ioctl(1, TIOCGWINSZ, &ws) < 0)
 533                 ws.ws_col = ws.ws_row = 0;
 534 #endif
 535         if (tcgetattr(1, &tbuf) < 0)
 536                 ospeed = B9600;
 537         else
 538                 ospeed = cfgetospeed(&tbuf);
 539         if (ospeed < B1200)
 540                 scrnheight = 9;
 541         else if (ospeed == B1200)
 542                 scrnheight = 14;
 543 #ifdef  TIOCGWINSZ
 544         else if (ws.ws_row != 0)
 545                 scrnheight = ws.ws_row;
 546 #endif
 547         else
 548                 scrnheight = 24;
 549 #ifdef  TIOCGWINSZ
 550         if ((realscreenheight = ws.ws_row) == 0)
 551                 realscreenheight = 24;
 552 #endif
 553 #ifdef  TIOCGWINSZ
 554         if ((scrnwidth = ws.ws_col) == 0)
 555 #endif
 556                 scrnwidth = 80;
 557 }