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