main.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Startup -- interface with user.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2014 Steffen "Daode" Nurpmeso <sdaoden@users.sf.net>.
   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 #ifndef HAVE_AMALGAMATION
  51 # define _MAIN_SOURCE
  52 # include "nail.h"
  53 #endif
  54
  55 #include <sys/ioctl.h>
  56
  57 #include <fcntl.h>
  58 #include <pwd.h>
  59
  60 #ifdef HAVE_NL_LANGINFO
  61 # include <langinfo.h>
  62 #endif
  63 #ifdef HAVE_SETLOCALE
  64 # include <locale.h>
  65 #endif
  66
  67 #include "version.h"
  68
  69 struct a_arg {
  70    struct a_arg   *aa_next;
  71    char           *aa_file;
  72 };
  73
  74 /* (extern, but not with amalgamation, so define here) */
  75 VL char const        weekday_names[7 + 1][4] = {
  76    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", ""
  77 };
  78 VL char const        month_names[12 + 1][4] = {
  79    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  80    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", ""
  81 };
  82 VL char const        uagent[] = UAGENT;
  83 VL char const        version[] = VERSION;
  84 /*VL char const        features[]; The "feature string" comes from config.h */
  85 VL uc_it const       class_char[] = {
  86 /* 000 nul  001 soh  002 stx  003 etx  004 eot  005 enq  006 ack  007 bel  */
  87    C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL,
  88 /* 010 bs   011 ht   012 nl   013 vt   014 np   015 cr   016 so   017 si   */
  89    C_CNTRL,  C_BLANK,  C_WHITE, C_SPACE, C_SPACE, C_SPACE, C_CNTRL, C_CNTRL,
  90 /* 020 dle  021 dc1  022 dc2  023 dc3  024 dc4  025 nak  026 syn  027 etb  */
  91    C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL,
  92 /* 030 can  031 em   032 sub  033 esc  034 fs   035 gs   036 rs   037 us   */
  93    C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL, C_CNTRL,
  94 /* 040 sp   041  !   042  "   043  #   044  $   045  %   046  &   047  '   */
  95    C_BLANK, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT,
  96 /* 050  (   051  )   052  *   053  +   054  ,    055  -   056  .   057  /   */
  97    C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT,
  98 /* 060  0   061  1   062  2   063  3   064  4   065  5   066  6   067  7   */
  99    C_OCTAL, C_OCTAL, C_OCTAL, C_OCTAL, C_OCTAL, C_OCTAL, C_OCTAL, C_OCTAL,
 100 /* 070  8   071  9   072  :   073  ;   074  <   075  =   076  >   077  ?   */
 101    C_DIGIT, C_DIGIT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT,
 102 /* 100  @   101  A   102  B   103  C   104  D   105  E   106  F   107  G   */
 103    C_PUNCT, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER,
 104 /* 110  H   111  I   112  J   113  K   114  L   115  M   116  N   117  O   */
 105    C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER,
 106 /* 120  P   121  Q   122  R   123  S   124  T   125  U   126  V   127  W   */
 107    C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER, C_UPPER,
 108 /* 130  X   131  Y   132  Z   133  [   134  \   135  ]   136  ^   137  _   */
 109    C_UPPER, C_UPPER, C_UPPER, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT,
 110 /* 140  `   141  a   142  b   143  c   144  d   145  e   146  f   147  g   */
 111    C_PUNCT, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER,
 112 /* 150  h   151  i   152  j   153  k   154  l   155  m   156  n   157  o   */
 113    C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER,
 114 /* 160  p   161  q   162  r   163  s   164  t   165  u   166  v   167  w   */
 115    C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER, C_LOWER,
 116 /* 170  x   171  y   172  z   173  {   174  |   175  }   176  ~   177 del  */
 117    C_LOWER, C_LOWER, C_LOWER, C_PUNCT, C_PUNCT, C_PUNCT, C_PUNCT, C_CNTRL
 118 };
 119
 120 /* getopt(3) fallback implementation */
 121 #ifdef HAVE_GETOPT
 122 # define _oarg       optarg
 123 # define _oind       optind
 124 /*# define _oerr     opterr*/
 125 # define _oopt       optopt
 126 #else
 127 static char          *_oarg;
 128 static int           _oind, /*_oerr,*/ _oopt;
 129 #endif
 130
 131 /* getopt(3) fallback implementation */
 132 #ifdef HAVE_GETOPT
 133 # define _getopt     getopt
 134 #else
 135 static int     _getopt(int argc, char *const argv[], const char *optstring);
 136 #endif
 137
 138 /* Perform basic startup initialization */
 139 static void    _startup(void);
 140
 141 /* Grow a char** */
 142 static size_t  _grow_cpp(char const ***cpp, size_t newsize, size_t oldcnt);
 143
 144 /* Initialize *tempdir*, *myname*, *homedir* */
 145 static void    _setup_vars(void);
 146
 147 /* We're in an interactive session - compute what the screen size for printing
 148  * headers etc. should be; notify tty upon resize if *is_sighdl* is not 0.
 149  * We use the following algorithm for the height:
 150  * If baud rate < 1200, use  9
 151  * If baud rate = 1200, use 14
 152  * If baud rate > 1200, use 24 or ws_row
 153  * Width is either 80 or ws_col */
 154 static void    _setscreensize(int is_sighdl);
 155
 156 /* Ok, we are reading mail.  Decide whether we are editing a mailbox or reading
 157  * the system mailbox, and open up the right stuff */
 158 static int     _rcv_mode(char const *folder);
 159
 160 /* Interrupt printing of the headers */
 161 static void    _hdrstop(int signo);
 162
 163 #ifndef HAVE_GETOPT
 164 static int
 165 _getopt(int argc, char * const argv[], char const *optstring)
 166 {
 167    static char const *lastp;
 168    int rv = -1, colon;
 169    char const *curp;
 170
 171    if ((colon = (optstring[0] == ':')))
 172       ++optstring;
 173    if (lastp != NULL) {
 174       curp = lastp;
 175       lastp = 0;
 176    } else {
 177       if (_oind >= argc || argv[_oind] == 0 || argv[_oind][0] != '-' ||
 178             argv[_oind][1] == '\0')
 179          goto jleave;
 180       if (argv[_oind][1] == '-' && argv[_oind][2] == '\0') {
 181          ++_oind;
 182          goto jleave;
 183       }
 184       curp = &argv[_oind][1];
 185    }
 186
 187    _oopt = curp[0];
 188    while (optstring[0] != '\0') {
 189       if (optstring[0] == ':' || optstring[0] != _oopt) {
 190          ++optstring;
 191          continue;
 192       }
 193       if (optstring[1] == ':') {
 194          if (curp[1] != '\0') {
 195             _oarg = UNCONST(&curp[1]);
 196             ++_oind;
 197          } else {
 198             if ((_oind += 2) > argc) {
 199                if (!colon /*&& _oerr*/) {
 200                   fprintf(stderr,
 201                      tr(79, "%s: option requires an argument -- %c\n"),
 202                      argv[0], (char)_oopt);
 203                }
 204                rv = (colon ? ':' : '?');
 205                goto jleave;
 206             }
 207             _oarg = argv[_oind - 1];
 208          }
 209       } else {
 210          if (curp[1] != '\0')
 211             lastp = &curp[1];
 212          else
 213             ++_oind;
 214          _oarg = NULL;
 215       }
 216       rv = _oopt;
 217       goto jleave;
 218    }
 219
 220    if (!colon /*&& opterr*/)
 221       fprintf(stderr, tr(78, "%s: illegal option -- %c\n"), argv[0], _oopt);
 222    if (curp[1] != '\0')
 223       lastp = &curp[1];
 224    else
 225       ++_oind;
 226    _oarg = 0;
 227    rv = '?';
 228 jleave:
 229    return rv;
 230 }
 231 #endif /* !HAVE_GETOPT */
 232
 233 static void
 234 _startup(void)
 235 {
 236    char *cp;
 237
 238    /* Absolutely the first thing we do is save our egid
 239     * and set it to the rgid, so that we can safely run
 240     * setgid.  We use the sgid (saved set-gid) to allow ourselves
 241     * to revert to the egid if we want (temporarily) to become
 242     * privileged XXX (s-nail-)*dotlock(-program)* */
 243    effectivegid = getegid();
 244    realgid = getgid();
 245    if (setgid(realgid) < 0) {
 246       perror("setgid");
 247       exit(1);
 248    }
 249
 250    image = -1;
 251    dflpipe = SIG_DFL;
 252 #ifndef HAVE_GETOPT
 253    _oind = /*_oerr =*/ 1;
 254 #endif
 255
 256    if ((cp = strrchr(progname, '/')) != NULL)
 257       progname = ++cp;
 258
 259    /* Set up a reasonable environment.
 260     * Figure out whether we are being run interactively,
 261     * start the SIGCHLD catcher, and so forth */
 262    safe_signal(SIGCHLD, sigchild);
 263
 264    if (isatty(STDIN_FILENO)) /* TODO should be isatty(0) && isatty(2)?? */
 265       options |= OPT_TTYIN | OPT_INTERACTIVE;
 266    if (isatty(STDOUT_FILENO))
 267       options |= OPT_TTYOUT;
 268    if (IS_TTY_SESSION())
 269       safe_signal(SIGPIPE, dflpipe = SIG_IGN);
 270
 271    /* Define defaults for internal variables, based on POSIX 2008/Cor 1-2013 */
 272    /* noallnet */
 273    /* noappend */
 274    ok_bset(asksub, TRU1);
 275    /* noaskbcc */
 276    /* noaskcc */
 277    /* noautoprint */
 278    /* nobang */
 279    /* nocmd */
 280    /* nocrt */
 281    /* nodebug */
 282    /* nodot */
 283    /* ok_vset(escape, ESCAPE *"~"*); TODO non-compliant */
 284    /* noflipr */
 285    /* nofolder */
 286    ok_bset(header, TRU1);
 287    /* nohold */
 288    /* noignore */
 289    /* noignoreeof */
 290    /* nokeep */
 291    /* nokeepsave */
 292    /* nometoo */
 293    /* noonehop -- Note: we ignore this one */
 294    /* nooutfolder */
 295    /* nopage */
 296    ok_vset(prompt, "\\& "); /* POSIX "? " unless *bsdcompat*, then "& " */
 297    /* noquiet */
 298    /* norecord */
 299    ok_bset(save, TRU1);
 300    /* nosendwait */
 301    /* noshowto */
 302    /* nosign */
 303    /* noSign */
 304    /* ok_vset(toplines, "5"); XXX somewhat hmm */
 305
 306 #ifdef HAVE_SETLOCALE
 307    setlocale(LC_ALL, "");
 308    mb_cur_max = MB_CUR_MAX;
 309 # ifdef HAVE_NL_LANGINFO
 310    if (ok_vlook(ttycharset) == NULL && (cp = nl_langinfo(CODESET)) != NULL)
 311       ok_vset(ttycharset, cp);
 312 # endif
 313
 314 # ifdef HAVE_C90AMEND1
 315    if (mb_cur_max > 1) {
 316       wchar_t  wc;
 317       if (mbtowc(&wc, "\303\266", 2) == 2 && wc == 0xF6 &&
 318             mbtowc(&wc, "\342\202\254", 3) == 3 && wc == 0x20AC)
 319          utf8 = 1;
 320       /* Reset state - it may have been messed up; luckily this also
 321        * gives us an indication wether the encoding has locking shift
 322        * state sequences */
 323       /* TODO temporary - use option bits! */
 324       enc_has_state = mbtowc(&wc, NULL, mb_cur_max);
 325    }
 326 # endif
 327 #else
 328    mb_cur_max = 1;
 329 #endif
 330
 331 #ifdef HAVE_CATGETS
 332 # ifdef NL_CAT_LOCALE
 333    catd = catopen(CATNAME, NL_CAT_LOCALE);
 334 # else
 335    catd = catopen(CATNAME, 0);
 336 # endif
 337 #endif
 338
 339 #ifdef HAVE_ICONV
 340    iconvd = (iconv_t)-1;
 341 #endif
 342 }
 343
 344 static size_t
 345 _grow_cpp(char const ***cpp, size_t newsize, size_t oldcnt)
 346 {
 347    /* Before spreserve(): use our string pool instead of LibC heap */
 348    char const **newcpp = salloc(sizeof(char*) * newsize);
 349
 350    if (oldcnt > 0)
 351       memcpy(newcpp, *cpp, oldcnt * sizeof(char*));
 352    *cpp = newcpp;
 353    return newsize;
 354 }
 355
 356 static void
 357 _setup_vars(void)
 358 {
 359    /* Before spreserve(): use our string pool instead of LibC heap */
 360    /* XXX further check paths? */
 361    char const *cp;
 362    uid_t uid;
 363    struct passwd *pwuid, *pw;
 364
 365    tempdir = ((cp = getenv("TMPDIR")) != NULL) ? savestr(cp) : TMPDIR_FALLBACK;
 366
 367    cp = (myname == NULL) ? getenv("USER") : myname;
 368    uid = getuid();
 369    if ((pwuid = getpwuid(uid)) == NULL)
 370       panic(tr(201, "Cannot associate a name with uid %lu"), (ul_it)uid);
 371    if (cp == NULL)
 372       myname = pwuid->pw_name;
 373    else if ((pw = getpwnam(cp)) == NULL)
 374       panic(tr(236, "`%s' is not a user of this system"), cp);
 375    else {
 376       myname = pw->pw_name;
 377       if (pw->pw_uid != uid)
 378          options |= OPT_u_FLAG;
 379    }
 380    myname = savestr(myname);
 381    /* XXX myfullname = pw->pw_gecos[OPTIONAL!] -> GUT THAT; TODO pw_shell */
 382
 383    if ((cp = getenv("HOME")) == NULL)
 384       cp = "."; /* XXX User and Login objects; Login: pw->pw_dir */
 385    homedir = savestr(cp);
 386 }
 387
 388 static void
 389 _setscreensize(int is_sighdl)
 390 {
 391    struct termios tbuf;
 392 #ifdef TIOCGWINSZ
 393    struct winsize ws;
 394 #elif defined TIOCGSIZE
 395    struct ttysize ts;
 396 #endif
 397
 398    scrnheight = realscreenheight = scrnwidth = 0;
 399
 400    /* (Also) POSIX: LINES and COLUMNS always override.  Adjust this
 401     * a little bit to be able to honour resizes during our lifetime and
 402     * only honour it upon first run; abuse *is_sighdl* as an indicator */
 403    if (!is_sighdl) {
 404       char *cp;
 405       long i;
 406
 407       if ((cp = getenv("LINES")) != NULL && (i = strtol(cp, NULL, 10)) > 0)
 408          scrnheight = realscreenheight = (int)i;
 409       if ((cp = getenv("COLUMNS")) != NULL && (i = strtol(cp, NULL, 10)) > 0)
 410          scrnwidth = (int)i;
 411
 412       if (scrnwidth != 0 && scrnheight != 0)
 413          goto jleave;
 414    }
 415
 416 #ifdef TIOCGWINSZ
 417    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
 418       ws.ws_col = ws.ws_row = 0;
 419 #elif defined TIOCGSIZE
 420    if (ioctl(STDOUT_FILENO, TIOCGSIZE, &ws) < 0)
 421       ts.ts_lines = ts.ts_cols = 0;
 422 #endif
 423
 424    if (scrnheight == 0) {
 425       speed_t ospeed = ((tcgetattr(STDOUT_FILENO, &tbuf) < 0)
 426             ? B9600 : cfgetospeed(&tbuf));
 427
 428       if (ospeed < B1200)
 429          scrnheight = 9;
 430       else if (ospeed == B1200)
 431          scrnheight = 14;
 432 #ifdef TIOCGWINSZ
 433       else if (ws.ws_row != 0)
 434          scrnheight = ws.ws_row;
 435 #elif defined TIOCGSIZE
 436       else if (ts.ts_lines != 0)
 437          scrnheight = ts.ts_lines;
 438 #endif
 439       else
 440          scrnheight = 24;
 441
 442 #if defined TIOCGWINSZ || defined TIOCGSIZE
 443       if (0 ==
 444 # ifdef TIOCGWINSZ
 445             (realscreenheight = ws.ws_row)
 446 # else
 447             (realscreenheight = ts.ts_lines)
 448 # endif
 449       )
 450          realscreenheight = 24;
 451 #endif
 452    }
 453
 454    if (scrnwidth == 0 && 0 ==
 455 #ifdef TIOCGWINSZ
 456          (scrnwidth = ws.ws_col)
 457 #elif defined TIOCGSIZE
 458          (scrnwidth = ts.ts_cols)
 459 #endif
 460    )
 461       scrnwidth = 80;
 462
 463 jleave:
 464 #ifdef SIGWINCH
 465    if (is_sighdl && IS_TTY_SESSION())
 466       tty_signal(SIGWINCH);
 467 #endif
 468 }
 469
 470 static sigjmp_buf __hdrjmp; /* XXX */
 471
 472 static int
 473 _rcv_mode(char const *folder)
 474 {
 475    char *cp;
 476    int i;
 477    sighandler_type prevint;
 478
 479    if (folder == NULL)
 480       folder = "%";
 481    else if (*folder == '@') {
 482       /* This must be treated specially to make invocation like
 483        * -A imap -f @mailbox work */
 484       if ((cp = ok_vlook(folder)) != NULL && which_protocol(cp) == PROTO_IMAP)
 485          (void)n_strlcpy(mailname, cp, MAXPATHLEN);
 486    }
 487
 488    i = setfile(folder, 0);
 489    if (i < 0)
 490       exit(1);    /* error already reported */
 491    if (options & OPT_EXISTONLY)
 492       exit(i);
 493
 494    if (options & OPT_HEADERSONLY) {
 495       print_headers(1, msgCount);
 496       exit(exit_status);
 497    }
 498
 499    callhook(mailname, 0);
 500    if (i > 0 && !ok_blook(emptystart))
 501       exit(1);
 502
 503    if (sigsetjmp(__hdrjmp, 1) == 0) {
 504       if ((prevint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 505          safe_signal(SIGINT, _hdrstop);
 506       if (!(options & OPT_N_FLAG)) {
 507          if (!ok_blook(quiet))
 508             printf(tr(140, "%s version %s.  Type ? for help.\n"),
 509                (ok_blook(bsdcompat) ? "Mail" : uagent), version);
 510          announce(1);
 511          fflush(stdout);
 512       }
 513       safe_signal(SIGINT, prevint);
 514    }
 515
 516    /* Enter the command loop */
 517    if (options & OPT_INTERACTIVE)
 518       tty_init();
 519    commands();
 520    if (options & OPT_INTERACTIVE)
 521       tty_destroy();
 522
 523    if (mb.mb_type == MB_FILE || mb.mb_type == MB_MAILDIR) {
 524       safe_signal(SIGHUP, SIG_IGN);
 525       safe_signal(SIGINT, SIG_IGN);
 526       safe_signal(SIGQUIT, SIG_IGN);
 527    }
 528    save_mbox_for_possible_quitstuff();
 529    quit();
 530    return exit_status;
 531 }
 532
 533 static void
 534 _hdrstop(int signo)
 535 {
 536    UNUSED(signo);
 537
 538    fflush(stdout);
 539    fprintf(stderr, tr(141, "\nInterrupt\n"));
 540    siglongjmp(__hdrjmp, 1);
 541 }
 542
 543 int
 544 main(int argc, char *argv[])
 545 {
 546    static char const optstr[] = "A:a:Bb:c:DdEeFfHiNnO:q:Rr:S:s:tu:Vv~#",
 547       usagestr[] =
 548          "Synopsis:\n"
 549          "  %s [-BDdEFintv~] [-A acc] [-a attachment] "
 550             "[-b bcc-addr] [-c cc-addr]\n"
 551          "\t  [-O mtaopt [-O mtaopt-arg]] [-q file] [-r from-addr] "
 552             "[-S var[=value]]\n"
 553          "\t  [-s subject] to-addr...\n"
 554          "  %s [-BDdEeHiNnRv~#] [-A acct] "
 555             "[-S var[=value]] -f [file]\n"
 556          "  %s [-BDdEeiNnRv~#] [-A acc] [-S var[=value]] [-u user]\n";
 557
 558    struct a_arg *a_head = NULL, *a_curr = /* silence CC */ NULL;
 559    struct name *to = NULL, *cc = NULL, *bcc = NULL;
 560    struct attachment *attach = NULL;
 561    char *cp = NULL, *subject = NULL, *qf = NULL, *Aflag = NULL;
 562    char const *okey, **oargs = NULL, *folder = NULL;
 563    size_t oargs_size = 0, oargs_count = 0, smopts_size = 0;
 564    int i;
 565
 566    /*
 567     * Start our lengthy setup
 568     */
 569
 570    starting =
 571    var_clear_allow_undefined = TRU1;
 572
 573    progname = argv[0];
 574    _startup();
 575
 576    /* Command line parsing */
 577    while ((i = _getopt(argc, argv, optstr)) >= 0) {
 578       switch (i) {
 579       case 'A':
 580          /* Execute an account command later on */
 581          Aflag = _oarg;
 582          break;
 583       case 'a':
 584          {  struct a_arg *nap = ac_alloc(sizeof(struct a_arg));
 585             if (a_head == NULL)
 586                a_head = nap;
 587             else
 588                a_curr->aa_next = nap;
 589             nap->aa_next = NULL;
 590             nap->aa_file = _oarg;
 591             a_curr = nap;
 592          }
 593          options |= OPT_SENDMODE;
 594          break;
 595       case 'B':
 596          /* Make 0/1 line buffered */
 597          setvbuf(stdin, NULL, _IOLBF, 0);
 598          setvbuf(stdout, NULL, _IOLBF, 0);
 599          break;
 600       case 'b':
 601          /* Get Blind Carbon Copy Recipient list */
 602          bcc = cat(bcc, checkaddrs(lextract(_oarg, GBCC | GFULL)));
 603          options |= OPT_SENDMODE;
 604          break;
 605       case 'c':
 606          /* Get Carbon Copy Recipient list */
 607          cc = cat(cc, checkaddrs(lextract(_oarg, GCC | GFULL)));
 608          options |= OPT_SENDMODE;
 609          break;
 610       case 'D':
 611 #ifdef HAVE_IMAP
 612          okey = "disconnected";
 613          goto joarg;
 614 #else
 615          break;
 616 #endif
 617       case 'd':
 618          okey = "debug";
 619 #ifdef HAVE_DEBUG
 620          ok_bset(debug, TRU1);
 621 #endif
 622          goto joarg;
 623       case 'E':
 624          okey = "skipemptybody";
 625          goto joarg;
 626       case 'e':
 627          options |= OPT_EXISTONLY;
 628          break;
 629       case 'F':
 630          options |= OPT_F_FLAG | OPT_SENDMODE;
 631          break;
 632       case 'f':
 633          /* User is specifying file to "edit" with Mail, as opposed to reading
 634           * system mailbox.  If no argument is given, we read his mbox file.
 635           * Check for remaining arguments later */
 636          folder = "&";
 637          break;
 638       case 'H':
 639          options |= OPT_HEADERSONLY;
 640          break;
 641       case 'i':
 642          /* Ignore interrupts */
 643          okey = "ignore";
 644          goto joarg;
 645       case 'N':
 646          /* Avoid initial header printing */
 647          okey = "noheader";
 648          goto joarg;
 649       case 'n':
 650          /* Don't source "unspecified system start-up file" */
 651          options |= OPT_NOSRC;
 652          break;
 653       case 'O':
 654          /* Additional options to pass-through to MTA */
 655          if (smopts_count == (size_t)smopts_size)
 656             smopts_size = _grow_cpp(&smopts, smopts_size + 8, smopts_count);
 657          smopts[smopts_count++] = skin(_oarg);
 658          break;
 659       case 'q':
 660          /* Quote file TODO drop? -Q with real quote?? what ? */
 661          if (*_oarg != '-')
 662             qf = _oarg;
 663          options |= OPT_SENDMODE;
 664          break;
 665       case 'R':
 666          /* Open folders read-only */
 667          options |= OPT_R_FLAG;
 668          break;
 669       case 'r':
 670          /* Set From address. */
 671          options |= OPT_r_FLAG;
 672          if ((option_r_arg = _oarg)[0] != '\0') {
 673             struct name *fa = nalloc(_oarg, GFULL);
 674
 675             if (is_addr_invalid(fa, 1) || is_fileorpipe_addr(fa)) {
 676                fprintf(stderr, tr(271, "Invalid address argument with -r\n"));
 677                goto jusage;
 678             }
 679             option_r_arg = fa->n_name;
 680             /* TODO -r options is set in smopts, but may
 681              * TODO be overwritten by setting from= in
 682              * TODO an interactive session!
 683              * TODO Maybe disable setting of from?
 684              * TODO Warn user?  Update manual!! */
 685             okey = savecat("from=", fa->n_fullname);
 686             goto joarg;
 687             /* ..and fa goes even though it is ready :/ */
 688          }
 689          break;
 690       case 'S':
 691          /* Set variable.  We need to do this twice, since the
 692           * user surely wants the setting to take effect
 693           * immediately, but also doesn't want it to be
 694           * overwritten from within resource files */
 695          {  char *a[2];
 696             okey = a[0] = _oarg;
 697             a[1] = NULL;
 698             set(a);
 699          }
 700 joarg:
 701          if (oargs_count == oargs_size)
 702             oargs_size = _grow_cpp(&oargs, oargs_size + 8, oargs_count);
 703          oargs[oargs_count++] = okey;
 704          break;
 705       case 's':
 706          /* Subject: */
 707          subject = _oarg;
 708          options |= OPT_SENDMODE;
 709          break;
 710       case 't':
 711          /* Read defined set of headers from mail to be send */
 712          options |= OPT_SENDMODE | OPT_t_FLAG;
 713          break;
 714       case 'u':
 715          /* Set user name to pretend to be; don't set OPT_u_FLAG yet, this is
 716           * done as necessary in _setup_vars() above */
 717          myname = _oarg;
 718          break;
 719       case 'V':
 720          puts(version);
 721          exit(0);
 722          /* NOTREACHED */
 723       case 'v':
 724          /* Be verbose */
 725          okey = "verbose";
 726 #ifdef HAVE_DEBUG
 727          ok_bset(verbose, TRU1);
 728 #endif
 729          goto joarg;
 730       case '~':
 731          /* Enable tilde escapes even in non-interactive mode */
 732          options |= OPT_TILDE_FLAG;
 733          break;
 734       case '#':
 735          /* Work in batch mode, even if non-interactive */
 736          if (oargs_count + 6 >= oargs_size)
 737             oargs_size = _grow_cpp(&oargs, oargs_size + 8, oargs_count);
 738          oargs[oargs_count + 0] = "dot";
 739          oargs[oargs_count + 1] = "emptystart";
 740          oargs[oargs_count + 2] = "noheader";
 741          oargs[oargs_count + 3] = "quiet";
 742          oargs[oargs_count + 4] = "sendwait";
 743          oargs[oargs_count + 5] = "MBOX=/dev/null";
 744          oargs_count += 6;
 745          options |= OPT_TILDE_FLAG | OPT_BATCH_FLAG;
 746          break;
 747       case '?':
 748 jusage:
 749          fprintf(stderr, tr(135, usagestr), progname, progname, progname);
 750          exit(2);
 751       }
 752    }
 753
 754    if (folder != NULL) {
 755       if (_oind < argc) {
 756          if (_oind + 1 < argc) {
 757             fprintf(stderr, tr(205, "More than one file given with -f\n"));
 758             goto jusage;
 759          }
 760          folder = argv[_oind];
 761       }
 762    } else {
 763       for (i = _oind; argv[i]; ++i)
 764          to = cat(to, checkaddrs(lextract(argv[i], GTO | GFULL)));
 765       if (to != NULL)
 766          options |= OPT_SENDMODE;
 767    }
 768
 769    /* Check for inconsistent arguments */
 770    if (folder != NULL && to != NULL) {
 771       fprintf(stderr, tr(137, "Cannot give -f and people to send to.\n"));
 772       goto jusage;
 773    }
 774    if ((options & (OPT_SENDMODE | OPT_t_FLAG)) == OPT_SENDMODE && to == NULL) {
 775       fprintf(stderr, tr(138,
 776          "Send options without primary recipient specified.\n"));
 777       goto jusage;
 778    }
 779    if ((options & OPT_R_FLAG) && to != NULL) {
 780       fprintf(stderr, tr(235, "The -R option is meaningless in send mode.\n"));
 781       goto jusage;
 782    }
 783
 784    /*
 785     * Likely to go, perform more setup
 786     */
 787
 788    _setup_vars();
 789
 790    if (options & OPT_INTERACTIVE) {
 791       _setscreensize(0);
 792 #ifdef SIGWINCH
 793 # ifndef TTY_WANTS_SIGWINCH
 794       if (safe_signal(SIGWINCH, SIG_IGN) != SIG_IGN)
 795 # endif
 796          safe_signal(SIGWINCH, _setscreensize);
 797 #endif
 798    } else
 799       scrnheight = realscreenheight = 24, scrnwidth = 80;
 800
 801    /* Snapshot our string pools.  Memory is auto-reclaimed from now on */
 802    spreserve();
 803
 804    if (!(options & OPT_NOSRC) && getenv("NAIL_NO_SYSTEM_RC") == NULL)
 805       load(SYSCONFRC);
 806    /* *expand() returns a savestr(), but load only uses the file name for
 807     * fopen(), so it's safe to do this */
 808    if ((cp = getenv("MAILRC")) == NULL && (cp = getenv("NAILRC")) == NULL)
 809       cp = UNCONST(MAILRC);
 810    load(file_expand(cp));
 811    if (getenv("NAIL_EXTRA_RC") == NULL &&
 812          (cp = ok_vlook(NAIL_EXTRA_RC)) != NULL)
 813       load(file_expand(cp));
 814
 815    /* Now we can set the account */
 816    if (Aflag != NULL) {
 817       char *a[2];
 818       a[0] = Aflag;
 819       a[1] = NULL;
 820       c_account(a);
 821    }
 822
 823    /* Ensure the -S and other command line options take precedence over
 824     * anything that may have been placed in resource files */
 825    for (i = 0; UICMP(z, i, <, oargs_count); ++i) {
 826       char const *a[2];
 827       a[0] = oargs[i];
 828       a[1] = NULL;
 829       set(a);
 830    }
 831
 832    /*
 833     * We're finally completely setup and ready to go
 834     */
 835
 836    starting =
 837    var_clear_allow_undefined = FAL0;
 838
 839    if (options & OPT_DEBUG)
 840       fprintf(stderr, tr(199, "user = %s, homedir = %s\n"), myname, homedir);
 841
 842    if (!(options & OPT_SENDMODE)) {
 843       exit_status = _rcv_mode(folder);
 844       goto jleave;
 845    }
 846
 847    /* Now that full mailx(1)-style file expansion is possible handle the
 848     * attachments which we had delayed due to this.
 849     * This may use savestr(), but since we won't enter the command loop we
 850     * don't need to care about that */
 851    while (a_head != NULL) {
 852       attach = add_attachment(attach, a_head->aa_file, NULL);
 853       if (attach != NULL) {
 854          a_curr = a_head;
 855          a_head = a_head->aa_next;
 856          ac_free(a_curr);
 857       } else {
 858          perror(a_head->aa_file);
 859          exit(1);
 860       }
 861    }
 862
 863    /* xxx exit_status = EXIT_OK; */
 864    if (options & OPT_INTERACTIVE)
 865       tty_init();
 866    mail(to, cc, bcc, subject, attach, qf, ((options & OPT_F_FLAG) != 0));
 867    if (options & OPT_INTERACTIVE)
 868       tty_destroy();
 869 jleave:
 870    return exit_status;
 871 }
 872
 873 /* vim:set fenc=utf-8:s-it-mode */