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 /* Add an option for sendmail(1) */
  79 static void     add_smopt(int argc_left, char *arg);
  80 static void     hdrstop(int signo);
  81 static void     setscreensize(int dummy);
  82
  83 static void
  84 add_smopt(int argc_left, char *arg)
  85 {
  86         if (smopts == NULL)
  87                 smopts = salloc((argc_left + 1) * sizeof(char*));
  88         smopts[smopts_count++] = arg;
  89 }
  90
  91 int
  92 main(int argc, char *argv[])
  93 {
  94         const char optstr[] = "A:a:Bb:c:DdEeFfHIiNnO:q:Rr:S:s:T:tu:Vv~",
  95                 usagestr[] =
  96                 "Usage:\t%s [-BDdEFintv~] [-A acc] [-a attachment]\n"
  97                 "\t\t[-b bcc-addr] [-c cc-addr] [-O mtaopt [-O mtaopt-arg]]\n"
  98                 "\t\t[-q file] [-r from-addr] [-S var[=value]]\n"
  99                 "\t\t[-s subject] to-addr...\n"
 100                 "\t%s [-BDdEeHIiNnRv~] [-A acct]\n"
 101                 "\t\t[-S var[=value]] [-T name] -f [file]\n"
 102                 "\t%s [-BDdEeiNnRv~] [-A acc] [-S var[=value]] [-u user]\n";
 103
 104         int scnt, i;
 105         struct name *to, *cc, *bcc;
 106         struct attachment *attach;
 107         char *cp, *subject, *ef, *qf, *fromaddr, *Aflag;
 108         char existonly, headersonly, sendflag, nosrc, Eflag, Fflag, tflag;
 109         char volatile Nflag;
 110         sighandler_type prevint;
 111
 112         /*
 113          * Absolutely the first thing we do is save our egid
 114          * and set it to the rgid, so that we can safely run
 115          * setgid.  We use the sgid (saved set-gid) to allow ourselves
 116          * to revert to the egid if we want (temporarily) to become
 117          * priveliged.
 118          */
 119         effectivegid = getegid();
 120         realgid = getgid();
 121         if (setgid(realgid) < 0) {
 122                 perror("setgid");
 123                 exit(1);
 124         }
 125
 126         starting = 1;
 127         progname = strrchr(argv[0], '/');
 128         if (progname != NULL)
 129                 progname++;
 130         else
 131                 progname = argv[0];
 132         /*
 133          * Set up a reasonable environment.
 134          * Figure out whether we are being run interactively,
 135          * start the SIGCHLD catcher, and so forth.
 136          */
 137         safe_signal(SIGCHLD, sigchild);
 138         is_a_tty[0] = isatty(0);
 139         is_a_tty[1] = isatty(1);
 140         if (is_a_tty[0]) {
 141                 assign("interactive", "");
 142                 if (is_a_tty[1])
 143                         safe_signal(SIGPIPE, dflpipe = SIG_IGN);
 144         }
 145         assign("header", "");
 146         assign("save", "");
 147 #ifdef  HAVE_SETLOCALE
 148         setlocale(LC_ALL, "");
 149         mb_cur_max = MB_CUR_MAX;
 150 # if defined HAVE_NL_LANGINFO && defined CODESET
 151         if (value("ttycharset") == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 152                 assign("ttycharset", cp);
 153 # endif
 154 # if defined HAVE_MBTOWC && defined HAVE_WCTYPE_H
 155         if (mb_cur_max > 1) {
 156                 wchar_t wc;
 157                 if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 158                                 mbtowc(&wc, "\342\202\254", 3) == 3 &&
 159                                 wc == 0x20AC)
 160                         utf8 = 1;
 161         }
 162 # endif
 163 #else
 164         mb_cur_max = 1;
 165 #endif
 166 #ifdef HAVE_CATGETS
 167 # ifdef NL_CAT_LOCALE
 168         i = NL_CAT_LOCALE;
 169 # else
 170         i = 0;
 171 # endif
 172         catd = catopen(CATNAME, i);
 173 #endif
 174 #ifdef HAVE_ICONV
 175         iconvd = (iconv_t) -1;
 176 #endif
 177         image = -1;
 178         /*
 179          * Now, determine how we are being used.
 180          * We successively pick off - flags.
 181          * If there is anything left, it is the base of the list
 182          * of users to mail to.  Argp will be set to point to the
 183          * first of these users.
 184          */
 185         scnt = 0;
 186         to = cc = bcc = NULL;
 187         attach = NULL;
 188         subject = ef = qf = fromaddr = Aflag = NULL;
 189         existonly = headersonly = sendflag = nosrc =
 190         Eflag = Fflag = tflag = 0;
 191         Nflag = 0;
 192
 193         while ((i = getopt(argc, argv, optstr)) != EOF) {
 194                 switch (i) {
 195                 case 'A':
 196                         /* Execute an account command later on */
 197                         Aflag = optarg;
 198                         break;
 199                 case 'a':
 200                         /* Get attachment filenames */
 201                         attach = add_attachment(attach, optarg, 0);
 202                         if (attach == NULL) {
 203                                 perror(optarg);
 204                                 exit(1);
 205                         }
 206                         sendflag = 1;
 207                         break;
 208                 case 'B':
 209                         /* Make 0/1 line buffered */
 210                         setvbuf(stdin, NULL, _IOLBF, 0);
 211                         setvbuf(stdout, NULL, _IOLBF, 0);
 212                         break;
 213                 case 'b':
 214                         /* Get Blind Carbon Copy Recipient list */
 215                         bcc = cat(bcc, checkaddrs(lextract(optarg,GBCC|GFULL)));
 216                         sendflag = 1;
 217                         break;
 218                 case 'c':
 219                         /* Get Carbon Copy Recipient list */
 220                         cc = cat(cc, checkaddrs(lextract(optarg, GCC|GFULL)));
 221                         sendflag = 1;
 222                         break;
 223                 case 'D':
 224                         assign("disconnected", "");
 225                         break;
 226                 case 'd':
 227                         ++debug;
 228                         break;
 229                 case 'E':
 230                         Eflag = 1;
 231                         break;
 232                 case 'e':
 233                         existonly = 1;
 234                         break;
 235                 case 'F':
 236                         Fflag = 1;
 237                         sendflag = 1;
 238                         break;
 239                 case 'f':
 240                         /*
 241                          * User is specifying file to "edit" with Mail,
 242                          * as opposed to reading system mailbox.
 243                          * If no argument is given, we read his mbox file.
 244                          * Check for remaining arguments later.
 245                          */
 246                         ef = "&";
 247                         break;
 248                 case 'H':
 249                         headersonly = 1;
 250                         break;
 251 jIflag:         case 'I':
 252                         /* Show Newsgroups: field in header summary */
 253                         Iflag = 1;
 254                         break;
 255                 case 'i':
 256                         /* Ignore interrupts */
 257                         assign("ignore", "");
 258                         break;
 259                 case 'N':
 260                         /* Avoid initial header printing */
 261                         Nflag = 1;
 262                         unset_internal("header");
 263                         break;
 264                 case 'n':
 265                         /* Don't source "unspecified system start-up file" */
 266                         nosrc = 1;
 267                         break;
 268                 case 'O':
 269                         /* Additional options to pass-through to MTA */
 270                         add_smopt(argc - optind, skin(optarg));
 271                         break;
 272                 case 'q':
 273                         /* Quote file TODO drop? -Q with real quote?? what ? */
 274                         if (*optarg != '-')
 275                                 qf = optarg;
 276                         sendflag = 1;
 277                         break;
 278                 case 'R':
 279                         /* Open folders read-only */
 280                         Rflag = 1;
 281                         break;
 282                 case 'r':
 283                         /* Set From address. */
 284                         {       struct name *fa = nalloc(optarg, GFULL);
 285                                 if (is_addr_invalid(fa, 1) ||
 286                                                 is_fileorpipe_addr(fa)) {
 287                                         fprintf(stderr, tr(271,
 288                                                 "Invalid address argument "
 289                                                 "with -r\n"));
 290                                         goto usage;
 291                                 }
 292                                 fromaddr = fa->n_fullname;
 293                                 add_smopt(argc - optind, "-r");
 294                                 add_smopt(-1, fa->n_name);
 295                                 /* ..and fa goes even though it is ready :/ */
 296                         }
 297                         tildeflag = -1;
 298                         break;
 299                 case 'S':
 300                         /* Set variable (do so later, after RC loading..) */
 301                         argv[scnt++] = optarg;
 302                         /* TODO Also set -S directly (see TODO) */
 303                         {       char *a[2];
 304                                 a[0] = optarg;
 305                                 a[1] = NULL;
 306                                 set(a);
 307                         }
 308                         break;
 309                 case 's':
 310                         /* Subject: */
 311                         subject = optarg;
 312                         sendflag = 1;
 313                         break;
 314                 case 'T':
 315                         /*
 316                          * Next argument is temp file to write which
 317                          * articles have been read/deleted for netnews.
 318                          */
 319                         Tflag = optarg;
 320                         if ((i = creat(Tflag, 0600)) < 0) {
 321                                 perror(Tflag);
 322                                 exit(1);
 323                         }
 324                         close(i);
 325                         goto jIflag;
 326                 case 't':
 327                         /* Read defined set of headers from mail to be send */
 328                         sendflag = 1;
 329                         tflag = 1;
 330                         break;
 331                 case 'u':
 332                         /* Set user name to pretend to be  */
 333                         uflag = myname = optarg;
 334                         break;
 335                 case 'V':
 336                         puts(version);
 337                         exit(0);
 338                         /*NOTREACHED*/
 339                 case 'v':
 340                         /* Be verbose */
 341                         assign("verbose", "");
 342                         break;
 343                 case '~':
 344                         /* Enable tilde escapes even in non-interactive mode */
 345                         if (tildeflag == 0)
 346                                 tildeflag = 1;
 347                         break;
 348                 case '?':
 349 usage:                  fprintf(stderr, tr(135, usagestr),
 350                                 progname, progname, progname);
 351                         exit(2);
 352                 }
 353         }
 354
 355         if (ef != NULL) {
 356                 if (optind < argc) {
 357                         if (optind + 1 < argc) {
 358                                 fprintf(stderr, tr(205,
 359                                         "More than one file given with -f\n"));
 360                                 goto usage;
 361                         }
 362                         ef = argv[optind];
 363                 }
 364         } else {
 365                 for (i = optind; argv[i]; i++)
 366                         to = cat(to, checkaddrs(lextract(argv[i], GTO|GFULL)));
 367         }
 368
 369         /* Check for inconsistent arguments */
 370         if (ef != NULL && to != NULL) {
 371                 fprintf(stderr, tr(137,
 372                         "Cannot give -f and people to send to.\n"));
 373                 goto usage;
 374         }
 375         if (sendflag && ! tflag && to == NULL) {
 376                 fprintf(stderr, tr(138,
 377                         "Send options without primary recipient specified.\n"));
 378                 goto usage;
 379         }
 380         if (Rflag && to != NULL) {
 381                 fprintf(stderr, "The -R option is meaningless in send mode.\n");
 382                 goto usage;
 383         }
 384         if (Iflag && ef == NULL) {
 385                 fprintf(stderr, tr(204, "Need -f with -I.\n"));
 386                 goto usage;
 387         }
 388
 389         tinit();
 390         setscreensize(0);
 391 #ifdef SIGWINCH
 392         if (value("interactive"))
 393                 if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 394                         safe_signal(SIGWINCH, setscreensize);
 395 #endif
 396         input = stdin;
 397         rcvmode = !to && !tflag;
 398         spreserve();
 399
 400         if (! nosrc)
 401                 load(SYSCONFRC);
 402         /*
 403          * Expand returns a savestr, but load only uses the file name
 404          * for fopen, so it's safe to do this.
 405          */
 406         if ((cp = getenv("MAILRC")) != NULL)
 407                 load(file_expand(cp));
 408         else if ((cp = getenv("NAILRC")) != NULL)
 409                 load(file_expand(cp));
 410         else
 411                 load(file_expand("~/.mailrc"));
 412         if (getenv("NAIL_EXTRA_RC") == NULL &&
 413                         (cp = value("NAIL_EXTRA_RC")) != NULL)
 414                 load(file_expand(cp));
 415
 416         /* Now we can set the account */
 417         if (Aflag) {
 418                 char *a[2];
 419                 a[0] = Aflag;
 420                 a[1] = NULL;
 421                 account(a);
 422         }
 423         /* Override 'skipemptybody' if '-E' flag was given */
 424         if (Eflag)
 425                 assign("skipemptybody", "");
 426         /* -S arguments override rc files */
 427         for (i = 0; i < scnt; ++i) {
 428                 char *a[2];
 429                 a[0] = argv[i];
 430                 a[1] = NULL;
 431                 set(a);
 432         }
 433         /* From address from command line overrides rc files */
 434         if (fromaddr)
 435                 assign("from", fromaddr);
 436
 437         starting = 0;
 438
 439         if (!rcvmode) {
 440                 mail(to, cc, bcc, subject, attach, qf, Fflag, tflag, Eflag);
 441                 /*
 442                  * why wait?
 443                  */
 444                 exit(senderr ? 1 : 0);
 445         }
 446         /*
 447          * Ok, we are reading mail.
 448          * Decide whether we are editing a mailbox or reading
 449          * the system mailbox, and open up the right stuff.
 450          */
 451         if (ef == NULL)
 452                 ef = "%";
 453         else if (*ef == '@') {
 454                 /*
 455                  * This must be treated specially to make invocation like
 456                  * -A imap -f @mailbox work.
 457                  */
 458                 if ((cp = value("folder")) != NULL &&
 459                                 which_protocol(cp) == PROTO_IMAP)
 460                         strncpy(mailname, cp, PATHSIZE)[PATHSIZE-1] = '\0';
 461         }
 462         i = setfile(ef, 0);
 463         if (i < 0)
 464                 exit(1);                /* error already reported */
 465         if (existonly)
 466                 exit(i);
 467         if (headersonly) {
 468                 if (mb.mb_type == MB_IMAP)
 469                         imap_getheaders(1, msgCount);
 470                 for (i = 1; i <= msgCount; i++)
 471                         printhead(i, stdout, 0);
 472                 exit(exit_status);
 473         }
 474         callhook(mailname, 0);
 475         if (i > 0 && value("emptystart") == NULL)
 476                 exit(1);
 477         if (sigsetjmp(hdrjmp, 1) == 0) {
 478                 if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 479                         safe_signal(SIGINT, hdrstop);
 480                 if (Nflag == 0) {
 481                         if (value("quiet") == NULL)
 482                                 printf(tr(140,
 483                                         "%s version %s.  Type ? for help.\n"),
 484                                         value("bsdcompat") ? "Mail" : uagent,
 485                                         version);
 486                         announce(1);
 487                         fflush(stdout);
 488                 }
 489                 safe_signal(SIGINT, prevint);
 490         }
 491         commands();
 492         if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 493                 safe_signal(SIGHUP, SIG_IGN);
 494                 safe_signal(SIGINT, SIG_IGN);
 495                 safe_signal(SIGQUIT, SIG_IGN);
 496         }
 497         strncpy(mboxname, expand("&"), sizeof mboxname)[sizeof mboxname-1]='\0';
 498         quit();
 499         return exit_status;
 500 }
 501
 502 /*
 503  * Interrupt printing of the headers.
 504  */
 505 /*ARGSUSED*/
 506 static void
 507 hdrstop(int signo)
 508 {
 509         (void)signo;
 510
 511         fflush(stdout);
 512         fprintf(stderr, tr(141, "\nInterrupt\n"));
 513         siglongjmp(hdrjmp, 1);
 514 }
 515
 516 /*
 517  * Compute what the screen size for printing headers should be.
 518  * We use the following algorithm for the height:
 519  *      If baud rate < 1200, use  9
 520  *      If baud rate = 1200, use 14
 521  *      If baud rate > 1200, use 24 or ws_row
 522  * Width is either 80 or ws_col;
 523  */
 524 /*ARGSUSED*/
 525 static void
 526 setscreensize(int dummy)
 527 {
 528         struct termios tbuf;
 529 #ifdef  TIOCGWINSZ
 530         struct winsize ws;
 531 #endif
 532         speed_t ospeed;
 533         (void)dummy;
 534
 535 #ifdef  TIOCGWINSZ
 536         if (ioctl(1, TIOCGWINSZ, &ws) < 0)
 537                 ws.ws_col = ws.ws_row = 0;
 538 #endif
 539         if (tcgetattr(1, &tbuf) < 0)
 540                 ospeed = B9600;
 541         else
 542                 ospeed = cfgetospeed(&tbuf);
 543         if (ospeed < B1200)
 544                 scrnheight = 9;
 545         else if (ospeed == B1200)
 546                 scrnheight = 14;
 547 #ifdef  TIOCGWINSZ
 548         else if (ws.ws_row != 0)
 549                 scrnheight = ws.ws_row;
 550 #endif
 551         else
 552                 scrnheight = 24;
 553 #ifdef  TIOCGWINSZ
 554         if ((realscreenheight = ws.ws_row) == 0)
 555                 realscreenheight = 24;
 556 #endif
 557 #ifdef  TIOCGWINSZ
 558         if ((scrnwidth = ws.ws_col) == 0)
 559 #endif
 560                 scrnwidth = 80;
 561 }