collect.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Collect input from standard input, handling ~ escapes.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2013 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 #ifndef HAVE_AMALGAMATION
  41 # include "nail.h"
  42 #endif
  43
  44 /*
  45  * The following hokiness with global variables is so that on
  46  * receipt of an interrupt signal, the partial message can be salted
  47  * away on dead.letter.
  48  */
  49
  50 static sighandler_type  _coll_saveint;  /* Previous SIGINT value */
  51 static sighandler_type  _coll_savehup;  /* Previous SIGHUP value */
  52 static sighandler_type  _coll_savetstp; /* Previous SIGTSTP value */
  53 static sighandler_type  _coll_savettou; /* Previous SIGTTOU value */
  54 static sighandler_type  _coll_savettin; /* Previous SIGTTIN value */
  55 static FILE             *_coll_fp;      /* File for saving away */
  56 static int volatile     _coll_hadintr;  /* Have seen one SIGINT so far */
  57 static sigjmp_buf       _coll_jmp;      /* To get back to work */
  58 static int              _coll_jmp_p;    /* whether to long jump */
  59 static sigjmp_buf       _coll_abort;    /* To end collection with error */
  60 static sigjmp_buf       _coll_pipejmp;  /* On broken pipe */
  61
  62 /* Handle `~:', `~_' */
  63 static void     _execute_command(struct header *hp, char *linebuf,
  64                         size_t linesize);
  65
  66 /* If *interactive* is set and *doecho* is, too, also dump to *stdout* */
  67 static int      _include_file(FILE *fbuf, char const *name, int *linecount,
  68                         int *charcount, bool_t doecho);
  69
  70 static void _collect_onpipe(int signo);
  71 static void insertcommand(FILE *fp, char const *cmd);
  72 static void print_collf(FILE *collf, struct header *hp);
  73 static int exwrite(char const *name, FILE *fp, int f);
  74 static enum okay makeheader(FILE *fp, struct header *hp);
  75 static void mesedit(int c, struct header *hp);
  76 static void mespipe(char *cmd);
  77 static int forward(char *ms, FILE *fp, int f);
  78 static void collstop(int s);
  79 static void collint(int s);
  80 static void collhup(int s);
  81 static int putesc(const char *s, FILE *stream);
  82
  83 static void
  84 _execute_command(struct header *hp, char *linebuf, size_t linesize)
  85 {
  86         /* The problem arises if there are rfc822 message attachments and the
  87          * user uses `~:' to change the current file.  TODO Unfortunately we
  88          * TODO cannot simply keep a pointer to, or increment a reference count
  89          * TODO of the current `file' (mailbox that is) object, because the
  90          * TODO codebase doesn't deal with that at all; so, until some far
  91          * TODO later time, copy the name of the path, and warn the user if it
  92          * TODO changed; we COULD use the AC_TMPFILE attachment type, i.e.,
  93          * TODO copy the message attachments over to temporary files, but that
  94          * TODO would require more changes so that the user still can recognize
  95          * TODO in `~@' etc. that its a rfc822 message attachment; see below */
  96         char *mnbuf = NULL;
  97         size_t mnlen = 0 /* silence CC */;
  98         struct attachment *ap;
  99
 100         /* If the above todo is worked, remove or outsource to attachments.c! */
 101         if ((ap = hp->h_attach) != NULL) do
 102                 if (ap->a_msgno) {
 103                         mnlen = strlen(mailname) + 1;
 104                         mnbuf = ac_alloc(mnlen);
 105                         memcpy(mnbuf, mailname, mnlen);
 106                 }
 107         while ((ap = ap->a_flink) != NULL);
 108
 109         inhook = 0;
 110         execute(linebuf, TRU1, linesize);
 111
 112         if (mnbuf != NULL && memcmp(mnbuf, mailname, mnlen) != 0)
 113                 fputs(tr(237, "The mail file has changed, existing rfc822 "
 114                         "attachments became invalid!\n"), stderr);
 115 }
 116
 117 static int
 118 _include_file(FILE *fbuf, char const *name, int *linecount, int *charcount,
 119         bool_t doecho)
 120 {
 121         int ret = -1;
 122         char *linebuf = NULL;
 123         size_t linesize = 0, linelen, cnt;
 124
 125         if (fbuf == NULL) {
 126                 if ((fbuf = Fopen(name, "r")) == NULL) {
 127                         perror(name);
 128                         goto jleave;
 129                 }
 130         } else
 131                 fflush_rewind(fbuf);
 132
 133         *linecount = *charcount = 0;
 134         cnt = fsize(fbuf);
 135         while (fgetline(&linebuf, &linesize, &cnt, &linelen, fbuf, 0)
 136                         != NULL) {
 137                 if (fwrite(linebuf, sizeof *linebuf, linelen, _coll_fp)
 138                                 != linelen)
 139                         goto jleave;
 140                 if ((options & OPT_INTERACTIVE) && doecho)
 141                         fwrite(linebuf, sizeof *linebuf, linelen, stdout);
 142                 ++(*linecount);
 143                 (*charcount) += linelen;
 144         }
 145         if (fflush(_coll_fp))
 146                 goto jleave;
 147
 148         ret = 0;
 149 jleave:
 150         if (linebuf != NULL)
 151                 free(linebuf);
 152         if (fbuf != NULL)
 153                 Fclose(fbuf);
 154         return (ret);
 155 }
 156
 157 /*ARGSUSED*/
 158 static void
 159 _collect_onpipe(int signo)
 160 {
 161         UNUSED(signo);
 162         siglongjmp(_coll_pipejmp, 1);
 163 }
 164
 165 /*
 166  * Execute cmd and insert its standard output into fp.
 167  */
 168 static void
 169 insertcommand(FILE *fp, char const *cmd)
 170 {
 171         FILE *ibuf = NULL;
 172         char const *cp;
 173         int c;
 174
 175         cp = ok_vlook(SHELL);
 176         if (cp == NULL)
 177                 cp = XSHELL;
 178         if ((ibuf = Popen(cmd, "r", cp, 0)) != NULL) {
 179                 while ((c = getc(ibuf)) != EOF) /* XXX bytewise, yuck! */
 180                         putc(c, fp);
 181                 Pclose(ibuf, TRU1);
 182         } else
 183                 perror(cmd);
 184 }
 185
 186 /*
 187  * ~p command.
 188  */
 189 static void
 190 print_collf(FILE *cf, struct header *hp)
 191 {
 192         char *lbuf = NULL;
 193         FILE *volatile obuf = stdout;
 194         struct attachment *ap;
 195         char const *cp;
 196         enum gfield gf;
 197         size_t linecnt, maxlines, linesize = 0, linelen, cnt, cnt2;
 198
 199         fflush(cf);
 200         rewind(cf);
 201         cnt = cnt2 = fsize(cf);
 202
 203         if (IS_TTY_SESSION() && (cp = ok_vlook(crt)) != NULL) {
 204                 for (linecnt = 0;
 205                         fgetline(&lbuf, &linesize, &cnt2, NULL, cf, 0);
 206                         linecnt++);
 207                 rewind(cf);
 208                 maxlines = (*cp == '\0' ? screensize() : atoi(cp));
 209                 maxlines -= 4;
 210                 if (hp->h_to)
 211                         maxlines--;
 212                 if (hp->h_subject)
 213                         maxlines--;
 214                 if (hp->h_cc)
 215                         maxlines--;
 216                 if (hp->h_bcc)
 217                         maxlines--;
 218                 if (hp->h_attach)
 219                         maxlines--;
 220                 maxlines -= myaddrs(hp) != NULL || hp->h_from != NULL;
 221                 maxlines -= ok_vlook(ORGANIZATION) != NULL ||
 222                         hp->h_organization != NULL;
 223                 maxlines -= ok_vlook(replyto) != NULL || hp->h_replyto != NULL;
 224                 maxlines -= ok_vlook(sender) != NULL || hp->h_sender != NULL;
 225                 if ((long)maxlines < 0 || linecnt > maxlines) {
 226                         cp = get_pager();
 227                         if (sigsetjmp(_coll_pipejmp, 1))
 228                                 goto endpipe;
 229                         obuf = Popen(cp, "w", NULL, 1);
 230                         if (obuf == NULL) {
 231                                 perror(cp);
 232                                 obuf = stdout;
 233                         } else
 234                                 safe_signal(SIGPIPE, &_collect_onpipe);
 235                 }
 236         }
 237
 238         fprintf(obuf, tr(62, "-------\nMessage contains:\n"));
 239         gf = GIDENT|GTO|GSUBJECT|GCC|GBCC|GNL|GFILES;
 240         if (ok_blook(fullnames))
 241                 gf |= GCOMMA;
 242         puthead(hp, obuf, gf, SEND_TODISP, CONV_NONE, NULL, NULL);
 243         while (fgetline(&lbuf, &linesize, &cnt, &linelen, cf, 1))
 244                 prout(lbuf, linelen, obuf);
 245         if (hp->h_attach != NULL) {
 246                 fputs(tr(63, "-------\nAttachments:\n"), obuf);
 247                 for (ap = hp->h_attach; ap != NULL; ap = ap->a_flink) {
 248                         if (ap->a_msgno)
 249                                 fprintf(obuf, " - message %u\n", ap->a_msgno);
 250                         else {
 251                                 /* TODO after MIME/send layer rewrite we *know*
 252                                  * TODO the details of the attachment here,
 253                                  * TODO so adjust this again, then */
 254                                 char const *cs, *csi = "-> ";
 255
 256                                 if ((cs = ap->a_charset) == NULL &&
 257                                                 (csi = "<- ",
 258                                                 cs = ap->a_input_charset)
 259                                                 == NULL)
 260                                         cs = charset_get_lc();
 261                                 if ((cp = ap->a_content_type) == NULL)
 262                                         cp = "?";
 263                                 else if (ascncasecmp(cp, "text/", 5) != 0)
 264                                         csi = "";
 265
 266                                 fprintf(obuf, " - [%s, %s%s] %s\n",
 267                                         cp, csi, cs, ap->a_name);
 268                         }
 269                 }
 270         }
 271 endpipe:
 272         if (obuf != stdout) {
 273                 safe_signal(SIGPIPE, SIG_IGN);
 274                 Pclose(obuf, TRU1);
 275                 safe_signal(SIGPIPE, dflpipe);
 276         }
 277         if (lbuf)
 278                 free(lbuf);
 279 }
 280
 281 FL FILE *
 282 collect(struct header *hp, int printheaders, struct message *mp,
 283                 char *quotefile, int doprefix)
 284 {
 285         FILE *fbuf;
 286         struct ignoretab *quoteig;
 287         int lc, cc, eofcount, c, t;
 288         int volatile escape, getfields;
 289         char *linebuf = NULL, *quote = NULL, *tempMail = NULL;
 290         char const *cp;
 291         size_t linesize = 0;
 292         long cnt;
 293         enum sendaction action;
 294         sigset_t oset, nset;
 295         sighandler_type savedtop;
 296
 297         _coll_fp = NULL;
 298         /*
 299          * Start catching signals from here, but we're still die on interrupts
 300          * until we're in the main loop.
 301          */
 302         sigemptyset(&nset);
 303         sigaddset(&nset, SIGINT);
 304         sigaddset(&nset, SIGHUP);
 305         sigprocmask(SIG_BLOCK, &nset, &oset);
 306         handlerpush(collint);
 307         if ((_coll_saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 308                 safe_signal(SIGINT, collint);
 309         if ((_coll_savehup = safe_signal(SIGHUP, SIG_IGN)) != SIG_IGN)
 310                 safe_signal(SIGHUP, collhup);
 311         /* TODO We do a lot of redundant signal handling, especially
 312          * TODO with the command line editor(s); try to merge this */
 313         _coll_savetstp = safe_signal(SIGTSTP, collstop);
 314         _coll_savettou = safe_signal(SIGTTOU, collstop);
 315         _coll_savettin = safe_signal(SIGTTIN, collstop);
 316         if (sigsetjmp(_coll_abort, 1))
 317                 goto jerr;
 318         if (sigsetjmp(_coll_jmp, 1))
 319                 goto jerr;
 320         sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
 321
 322         noreset++;
 323         if ((_coll_fp = Ftemp(&tempMail, "Rs", "w+", 0600, 1)) == NULL) {
 324                 perror(tr(51, "temporary mail file"));
 325                 goto jerr;
 326         }
 327         unlink(tempMail);
 328         Ftfree(&tempMail);
 329
 330         if ((cp = ok_vlook(NAIL_HEAD)) != NULL && putesc(cp, _coll_fp) < 0)
 331                 goto jerr;
 332
 333         /*
 334          * If we are going to prompt for a subject,
 335          * refrain from printing a newline after
 336          * the headers (since some people mind).
 337          */
 338         getfields = 0;
 339         if (! (options & OPT_t_FLAG)) {
 340                 t = GTO|GSUBJECT|GCC|GNL;
 341                 if (ok_blook(fullnames))
 342                         t |= GCOMMA;
 343                 if (hp->h_subject == NULL && (options & OPT_INTERACTIVE) &&
 344                             (ok_blook(ask) || ok_blook(asksub)))
 345                         t &= ~GNL, getfields |= GSUBJECT;
 346                 if (hp->h_to == NULL && (options & OPT_INTERACTIVE))
 347                         t &= ~GNL, getfields |= GTO;
 348                 if (!ok_blook(bsdcompat) && !ok_blook(askatend) &&
 349                                 (options & OPT_INTERACTIVE)) {
 350                         if (hp->h_bcc == NULL && ok_blook(askbcc))
 351                                 t &= ~GNL, getfields |= GBCC;
 352                         if (hp->h_cc == NULL && ok_blook(askcc))
 353                                 t &= ~GNL, getfields |= GCC;
 354                 }
 355                 if (printheaders) {
 356                         (void)puthead(hp, stdout, t, SEND_TODISP, CONV_NONE,
 357                                         NULL, NULL);
 358                         (void)fflush(stdout);
 359                 }
 360         }
 361
 362         /*
 363          * Quote an original message
 364          */
 365         if (mp != NULL && (doprefix || (quote = ok_vlook(quote)) != NULL)) {
 366                 quoteig = allignore;
 367                 action = SEND_QUOTE;
 368                 if (doprefix) {
 369                         quoteig = fwdignore;
 370                         if ((cp = ok_vlook(fwdheading)) == NULL)
 371                                 cp = "-------- Original Message --------";
 372                         if (*cp && fprintf(_coll_fp, "%s\n", cp) < 0)
 373                                 goto jerr;
 374                 } else if (strcmp(quote, "noheading") == 0) {
 375                         /*EMPTY*/;
 376                 } else if (strcmp(quote, "headers") == 0) {
 377                         quoteig = ignore;
 378                 } else if (strcmp(quote, "allheaders") == 0) {
 379                         quoteig = NULL;
 380                         action = SEND_QUOTE_ALL;
 381                 } else {
 382                         cp = hfield1("from", mp);
 383                         if (cp != NULL && (cnt = (long)strlen(cp)) > 0) {
 384                                 if (xmime_write(cp, cnt, _coll_fp,
 385                                                 CONV_FROMHDR, TD_NONE,
 386                                                 NULL) < 0)
 387                                         goto jerr;
 388                                 if (fprintf(_coll_fp,
 389                                                 tr(52, " wrote:\n\n")) < 0)
 390                                         goto jerr;
 391                         }
 392                 }
 393                 if (fflush(_coll_fp))
 394                         goto jerr;
 395                 cp = ok_vlook(indentprefix);
 396                 if (cp != NULL && *cp == '\0')
 397                         cp = "\t";
 398                 if (sendmp(mp, _coll_fp, quoteig, (doprefix ? NULL : cp),
 399                                 action, NULL) < 0)
 400                         goto jerr;
 401         }
 402
 403         /* Print what we have sofar also on the terminal */
 404         rewind(_coll_fp);
 405         while ((c = getc(_coll_fp)) != EOF) /* XXX bytewise, yuck! */
 406                 (void)putc(c, stdout);
 407         if (fseek(_coll_fp, 0, SEEK_END))
 408                 goto jerr;
 409
 410         escape = ((cp = ok_vlook(escape)) != NULL) ? *cp : ESCAPE;
 411         eofcount = 0;
 412         _coll_hadintr = 0;
 413
 414         if (!sigsetjmp(_coll_jmp, 1)) {
 415                 if (getfields)
 416                         grab_headers(hp, getfields, 1);
 417                 if (quotefile != NULL) {
 418                         if (_include_file(NULL, quotefile, &lc, &cc, TRU1) != 0)
 419                                 goto jerr;
 420                 }
 421                 if ((options & OPT_INTERACTIVE) && ok_blook(editalong)) {
 422                         rewind(_coll_fp);
 423                         mesedit('e', hp);
 424                         goto jcont;
 425                 }
 426         } else {
 427                 /*
 428                  * Come here for printing the after-signal message.
 429                  * Duplicate messages won't be printed because
 430                  * the write is aborted if we get a SIGTTOU.
 431                  */
 432 jcont:
 433                 if (_coll_hadintr) {
 434                         (void)fprintf(stderr, tr(53,
 435                                 "\n(Interrupt -- one more to kill letter)\n"));
 436                 } else {
 437                         printf(tr(54, "(continue)\n"));
 438                         (void)fflush(stdout);
 439                 }
 440         }
 441
 442         /*
 443          * No tilde escapes, interrupts not expected.  Simply copy STDIN
 444          */
 445         if (! (options & (OPT_INTERACTIVE | OPT_t_FLAG|OPT_TILDE_FLAG))) {
 446                 linebuf = srealloc(linebuf, linesize = LINESIZE);
 447                 while ((cnt = fread(linebuf, sizeof *linebuf,
 448                                                 linesize, stdin)) > 0) {
 449                         if ((size_t)cnt != fwrite(linebuf, sizeof *linebuf,
 450                                                 cnt, _coll_fp))
 451                                 goto jerr;
 452                 }
 453                 if (fflush(_coll_fp))
 454                         goto jerr;
 455                 goto jout;
 456         }
 457
 458         /*
 459          * The interactive collect loop
 460          */
 461         for (;;) {
 462                 _coll_jmp_p = 1;
 463                 cnt = readline_input(LNED_NONE, "", &linebuf, &linesize);
 464                 _coll_jmp_p = 0;
 465
 466                 if (cnt < 0) {
 467                         if ((options & OPT_INTERACTIVE) &&
 468                             ok_blook(ignoreeof) && ++eofcount < 25) {
 469                                 printf(tr(55,
 470                                         "Use \".\" to terminate letter\n"));
 471                                 continue;
 472                         }
 473                         break;
 474                 }
 475                 if ((options & OPT_t_FLAG) && cnt == 0) {
 476                         rewind(_coll_fp);
 477                         if (makeheader(_coll_fp, hp) != OKAY)
 478                                 goto jerr;
 479                         rewind(_coll_fp);
 480                         options &= ~OPT_t_FLAG;
 481                         continue;
 482                 }
 483
 484                 eofcount = 0;
 485                 _coll_hadintr = 0;
 486                 if (linebuf[0] == '.' && linebuf[1] == '\0' &&
 487                                 (options & (OPT_INTERACTIVE|OPT_TILDE_FLAG)) &&
 488                                 (ok_blook(dot) || ok_blook(ignoreeof)))
 489                         break;
 490                 if (cnt == 0 || linebuf[0] != escape || ! (options &
 491                                 (OPT_INTERACTIVE | OPT_TILDE_FLAG))) {
 492                         /* TODO calls putline(), which *always* appends LF;
 493                          * TODO thus, STDIN with -t will ALWAYS end with LF,
 494                          * TODO even if no trailing LF and QP CTE */
 495                         if (putline(_coll_fp, linebuf, cnt) < 0)
 496                                 goto jerr;
 497                         continue;
 498                 }
 499
 500                 c = linebuf[1];
 501                 switch (c) {
 502                 default:
 503                         /*
 504                          * On double escape, just send the single one.
 505                          * Otherwise, it's an error.
 506                          */
 507                         if (c == escape) {
 508                                 if (putline(_coll_fp, &linebuf[1], cnt - 1) < 0)
 509                                         goto jerr;
 510                                 else
 511                                         break;
 512                         }
 513                         fputs(tr(56, "Unknown tilde escape.\n"), stderr);
 514                         break;
 515 #ifdef HAVE_DEBUG
 516                 case 'C':
 517                         /* Dump core */
 518                         core(NULL);
 519                         break;
 520 #endif
 521                 case '!':
 522                         /* Shell escape, send the balance of line to sh -c */
 523                         shell(&linebuf[2]);
 524                         break;
 525                 case ':':
 526                         /* FALLTHRU */
 527                 case '_':
 528                         /* Escape to command mode, but be nice! */
 529                         _execute_command(hp, linebuf + 2, cnt - 2);
 530                         goto jcont;
 531                 case '.':
 532                         /* Simulate end of file on input */
 533                         goto jout;
 534                 case 'x':
 535                         /* Same as 'q', but no dead.letter saving */
 536                         /* FALLTHRU */
 537                 case 'q':
 538                         /* Force a quit, act like an interrupt had happened */
 539                         ++_coll_hadintr;
 540                         collint((c == 'x') ? 0 : SIGINT);
 541                         exit(1);
 542                         /*NOTREACHED*/
 543                 case 'h':
 544                         /* Grab a bunch of headers */
 545                         do
 546                                 grab_headers(hp, GTO|GSUBJECT|GCC|GBCC,
 547                                                 (ok_blook(bsdcompat) &&
 548                                                 ok_blook(bsdorder)));
 549                         while (hp->h_to == NULL);
 550                         goto jcont;
 551                 case 'H':
 552                         /* Grab extra headers */
 553                         do
 554                                 grab_headers(hp, GEXTRA, 0);
 555                         while (check_from_and_sender(hp->h_from, hp->h_sender));
 556                         goto jcont;
 557                 case 't':
 558                         /* Add to the To list */
 559                         while ((hp->h_to = cat(hp->h_to, checkaddrs(
 560                                         lextract(&linebuf[2], GTO|GFULL))))
 561                                         == NULL)
 562                                 ;
 563                         break;
 564                 case 's':
 565                         /* Set the Subject list */
 566                         cp = &linebuf[2];
 567                         while (whitechar(*cp))
 568                                 ++cp;
 569                         hp->h_subject = savestr(cp);
 570                         break;
 571 #ifdef HAVE_DEBUG
 572                 case 'S':
 573                         c_sstats(NULL);
 574                         break;
 575 #endif
 576                 case '@':
 577                         /* Edit the attachment list */
 578                         if (linebuf[2] != '\0')
 579                                 hp->h_attach = append_attachments(hp->h_attach,
 580                                                 &linebuf[2]);
 581                         else
 582                                 hp->h_attach = edit_attachments(hp->h_attach);
 583                         break;
 584                 case 'c':
 585                         /* Add to the CC list */
 586                         hp->h_cc = cat(hp->h_cc, checkaddrs(
 587                                         lextract(&linebuf[2], GCC|GFULL)));
 588                         break;
 589                 case 'b':
 590                         /* Add stuff to blind carbon copies list */
 591                         hp->h_bcc = cat(hp->h_bcc, checkaddrs(
 592                                         lextract(&linebuf[2], GBCC|GFULL)));
 593                         break;
 594                 case 'd':
 595                         strncpy(linebuf + 2, getdeadletter(), linesize - 2);
 596                         linebuf[linesize-1]='\0';
 597                         /*FALLTHRU*/
 598                 case 'r':
 599                 case '<':
 600                         /*
 601                          * Invoke a file:
 602                          * Search for the file name,
 603                          * then open it and copy the contents to _coll_fp.
 604                          */
 605                         cp = &linebuf[2];
 606                         while (whitechar(*cp))
 607                                 cp++;
 608                         if (*cp == '\0') {
 609                                 fputs(tr(57, "Interpolate what file?\n"),
 610                                         stderr);
 611                                 break;
 612                         }
 613                         if (*cp == '!') {
 614                                 insertcommand(_coll_fp, cp + 1);
 615                                 break;
 616                         }
 617                         if ((cp = file_expand(cp)) == NULL)
 618                                 break;
 619                         if (is_dir(cp)) {
 620                                 fprintf(stderr, tr(58, "%s: Directory\n"), cp);
 621                                 break;
 622                         }
 623                         if ((fbuf = Fopen(cp, "r")) == NULL) {
 624                                 perror(cp);
 625                                 break;
 626                         }
 627                         printf(tr(59, "\"%s\" "), cp);
 628                         fflush(stdout);
 629                         if (_include_file(fbuf, cp, &lc, &cc, FAL0) != 0)
 630                                 goto jerr;
 631                         printf(tr(60, "%d/%d\n"), lc, cc);
 632                         break;
 633                 case 'i':
 634                         /* Insert a variable into the file */
 635                         cp = &linebuf[2];
 636                         while (whitechar(*cp))
 637                                 ++cp;
 638                         if ((cp = vok_vlook(cp)) == NULL || *cp == '\0')
 639                                 break;
 640                         if (putesc(cp, _coll_fp) < 0)
 641                                 goto jerr;
 642                         if ((options & OPT_INTERACTIVE) &&
 643                                         putesc(cp, stdout) < 0)
 644                                 goto jerr;
 645                         break;
 646                 case 'a':
 647                 case 'A':
 648                         /* Insert the contents of a signature variable */
 649                         cp = (c == 'a') ? ok_vlook(sign) : ok_vlook(Sign);
 650                         if (cp != NULL && *cp != '\0') {
 651                                 if (putesc(cp, _coll_fp) < 0)
 652                                         goto jerr;
 653                                 if ((options & OPT_INTERACTIVE) &&
 654                                                 putesc(cp, stdout) < 0)
 655                                         goto jerr;
 656                         }
 657                         break;
 658                 case 'w':
 659                         /* Write the message on a file */
 660                         cp = &linebuf[2];
 661                         while (blankchar(*cp))
 662                                 ++cp;
 663                         if (*cp == '\0' || (cp = file_expand(cp)) == NULL) {
 664                                 fputs(tr(61, "Write what file!?\n"), stderr);
 665                                 break;
 666                         }
 667                         rewind(_coll_fp);
 668                         if (exwrite(cp, _coll_fp, 1) < 0)
 669                                 goto jerr;
 670                         break;
 671                 case 'm':
 672                 case 'M':
 673                 case 'f':
 674                 case 'F':
 675                         /*
 676                          * Interpolate the named messages, if we
 677                          * are in receiving mail mode.  Does the
 678                          * standard list processing garbage.
 679                          * If ~f is given, we don't shift over.
 680                          */
 681                         if (forward(linebuf + 2, _coll_fp, c) < 0)
 682                                 goto jerr;
 683                         goto jcont;
 684                 case 'p':
 685                         /*
 686                          * Print out the current state of the
 687                          * message without altering anything.
 688                          */
 689                         print_collf(_coll_fp, hp);
 690                         goto jcont;
 691                 case '|':
 692                         /*
 693                          * Pipe message through command.
 694                          * Collect output as new message.
 695                          */
 696                         rewind(_coll_fp);
 697                         mespipe(&linebuf[2]);
 698                         goto jcont;
 699                 case 'v':
 700                 case 'e':
 701                         /*
 702                          * Edit the current message.
 703                          * 'e' means to use EDITOR
 704                          * 'v' means to use VISUAL
 705                          */
 706                         rewind(_coll_fp);
 707                         mesedit(c, ok_blook(editheaders) ? hp : NULL);
 708                         goto jcont;
 709                 case '?':
 710                         /*
 711                          * Last the lengthy help string.
 712                          * (Very ugly, but take care for compiler supported
 713                          * string lengths :()
 714                          */
 715                         (void)puts(tr(300,
 716 "-------------------- ~ ESCAPES ----------------------------\n"
 717 "~~             Quote a single tilde\n"
 718 "~@ [file ...]  Edit attachment list\n"
 719 "~b users       Add users to \"blind\" cc list\n"
 720 "~c users       Add users to cc list\n"
 721 "~d             Read in dead.letter\n"
 722 "~e             Edit the message buffer\n"
 723 "~f messages    Read in messages without indenting lines\n"
 724 "~F messages    Same as ~f, but keep all header lines\n"
 725 "~h             Prompt for to list, subject, cc, and \"blind\" cc list\n"));
 726                         (void)puts(tr(301,
 727 "~r file        Read a file into the message buffer\n"
 728 "~p             Print the message buffer\n"
 729 "~q             Abort message composition and save text to dead.letter\n"
 730 "~m messages    Read in messages with each line indented\n"
 731 "~M messages    Same as ~m, but keep all header lines\n"
 732 "~s subject     Set subject\n"
 733 "~t users       Add users to to list\n"
 734 "~v             Invoke display editor on message\n"
 735 "~w file        Write message onto file\n"
 736 "~x             Abort message composition and discard text written so far\n"));
 737                         (void)puts(tr(302,
 738 "~!command      Invoke the shell\n"
 739 "~:command      Execute a regular command\n"
 740 "-----------------------------------------------------------\n"));
 741                         break;
 742                 }
 743         }
 744
 745 jout:
 746         if (_coll_fp != NULL) {
 747                 if ((cp = ok_vlook(NAIL_TAIL)) != NULL) {
 748                         if (putesc(cp, _coll_fp) < 0)
 749                                 goto jerr;
 750                         if ((options & OPT_INTERACTIVE) &&
 751                                         putesc(cp, stdout) < 0)
 752                                 goto jerr;
 753                 }
 754                 rewind(_coll_fp);
 755         }
 756         if (linebuf != NULL)
 757                 free(linebuf);
 758         handlerpop();
 759         noreset--;
 760         sigemptyset(&nset);
 761         sigaddset(&nset, SIGINT);
 762         sigaddset(&nset, SIGHUP);
 763         sigprocmask(SIG_BLOCK, &nset, (sigset_t*)NULL);
 764         safe_signal(SIGINT, _coll_saveint);
 765         safe_signal(SIGHUP, _coll_savehup);
 766         safe_signal(SIGTSTP, _coll_savetstp);
 767         safe_signal(SIGTTOU, _coll_savettou);
 768         safe_signal(SIGTTIN, _coll_savettin);
 769         sigprocmask(SIG_SETMASK, &oset, (sigset_t*)NULL);
 770         return _coll_fp;
 771
 772 jerr:
 773         if (tempMail != NULL) {
 774                 rm(tempMail);
 775                 Ftfree(&tempMail);
 776         }
 777         if (_coll_fp != NULL) {
 778                 Fclose(_coll_fp);
 779                 _coll_fp = NULL;
 780         }
 781         goto jout;
 782 }
 783
 784 /*
 785  * Write a file, ex-like if f set.
 786  */
 787 static int
 788 exwrite(char const *name, FILE *fp, int f)
 789 {
 790         FILE *of;
 791         int c;
 792         long cc;
 793         int lc;
 794
 795         if (f) {
 796                 printf("\"%s\" ", name);
 797                 fflush(stdout);
 798         }
 799         if ((of = Fopen(name, "a")) == NULL) {
 800                 perror(NULL);
 801                 return(-1);
 802         }
 803         lc = 0;
 804         cc = 0;
 805         while ((c = getc(fp)) != EOF) {
 806                 cc++;
 807                 if (c == '\n')
 808                         lc++;
 809                 putc(c, of);
 810                 if (ferror(of)) {
 811                         perror(name);
 812                         Fclose(of);
 813                         return(-1);
 814                 }
 815         }
 816         Fclose(of);
 817         printf(tr(65, "%d/%ld\n"), lc, cc);
 818         fflush(stdout);
 819         return(0);
 820 }
 821
 822 static enum okay
 823 makeheader(FILE *fp, struct header *hp)
 824 {
 825         char *tempEdit;
 826         FILE *nf;
 827         int c;
 828
 829         if ((nf = Ftemp(&tempEdit, "Re", "w+", 0600, 1)) == NULL) {
 830                 perror(tr(66, "temporary mail edit file"));
 831                 return STOP;
 832         }
 833         unlink(tempEdit);
 834         Ftfree(&tempEdit);
 835
 836         extract_header(fp, hp);
 837         while ((c = getc(fp)) != EOF) /* XXX bytewise, yuck! */
 838                 putc(c, nf);
 839         if (fp != _coll_fp)
 840                 Fclose(_coll_fp);
 841         Fclose(fp);
 842         _coll_fp = nf;
 843         if (check_from_and_sender(hp->h_from, hp->h_sender))
 844                 return STOP;
 845         return OKAY;
 846 }
 847
 848 /*
 849  * Edit the message being collected on fp.
 850  * On return, make the edit file the new temp file.
 851  */
 852 static void
 853 mesedit(int c, struct header *hp)
 854 {
 855         sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
 856         bool_t saved = ok_blook(add_file_recipients);
 857         FILE *nf;
 858
 859         ok_bset(add_file_recipients, FAL0);
 860         nf = run_editor(_coll_fp, (off_t)-1, c, 0, hp, NULL, SEND_MBOX, sigint);
 861
 862         if (nf != NULL) {
 863                 if (hp) {
 864                         rewind(nf);
 865                         makeheader(nf, hp);
 866                 } else {
 867                         fseek(nf, 0L, SEEK_END);
 868                         Fclose(_coll_fp);
 869                         _coll_fp = nf;
 870                 }
 871         }
 872
 873         ok_bset(add_file_recipients, saved);
 874         safe_signal(SIGINT, sigint);
 875 }
 876
 877 /*
 878  * Pipe the message through the command.
 879  * Old message is on stdin of command;
 880  * New message collected from stdout.
 881  * Sh -c must return 0 to accept the new message.
 882  */
 883 static void
 884 mespipe(char *cmd)
 885 {
 886         FILE *nf;
 887         sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
 888         char *tempEdit;
 889         char const *sh;
 890
 891         if ((nf = Ftemp(&tempEdit, "Re", "w+", 0600, 1)) == NULL) {
 892                 perror(tr(66, "temporary mail edit file"));
 893                 goto out;
 894         }
 895         fflush(_coll_fp);
 896         unlink(tempEdit);
 897         Ftfree(&tempEdit);
 898         /*
 899          * stdin = current message.
 900          * stdout = new message.
 901          */
 902         if ((sh = ok_vlook(SHELL)) == NULL)
 903                 sh = XSHELL;
 904         if (run_command(sh, 0, fileno(_coll_fp), fileno(nf), "-c", cmd, NULL)
 905                         < 0) {
 906                 Fclose(nf);
 907                 goto out;
 908         }
 909         if (fsize(nf) == 0) {
 910                 fprintf(stderr, tr(67, "No bytes from \"%s\" !?\n"), cmd);
 911                 Fclose(nf);
 912                 goto out;
 913         }
 914         /*
 915          * Take new files.
 916          */
 917         fseek(nf, 0L, SEEK_END);
 918         Fclose(_coll_fp);
 919         _coll_fp = nf;
 920 out:
 921         safe_signal(SIGINT, sigint);
 922 }
 923
 924 /*
 925  * Interpolate the named messages into the current
 926  * message, preceding each line with a tab.
 927  * Return a count of the number of characters now in
 928  * the message, or -1 if an error is encountered writing
 929  * the message temporary.  The flag argument is 'm' if we
 930  * should shift over and 'f' if not.
 931  */
 932 static int
 933 forward(char *ms, FILE *fp, int f)
 934 {
 935         int *msgvec;
 936         struct ignoretab *ig;
 937         char const *tabst;
 938         enum sendaction action;
 939
 940         /*LINTED*/
 941         msgvec = (int *)salloc((msgCount+1) * sizeof *msgvec);
 942         if (msgvec == NULL)
 943                 return(0);
 944         if (getmsglist(ms, msgvec, 0) < 0)
 945                 return(0);
 946         if (*msgvec == 0) {
 947                 *msgvec = first(0, MMNORM);
 948                 if (*msgvec == 0) {
 949                         fputs(tr(68, "No appropriate messages\n"), stderr);
 950                         return 0;
 951                 }
 952                 msgvec[1] = 0;
 953         }
 954         if (f == 'f' || f == 'F')
 955                 tabst = NULL;
 956         else if ((tabst = ok_vlook(indentprefix)) == NULL)
 957                 tabst = "\t";
 958         ig = upperchar(f) ? (struct ignoretab *)NULL : ignore;
 959         action = upperchar(f) ? SEND_QUOTE_ALL : SEND_QUOTE;
 960         printf(tr(69, "Interpolating:"));
 961         for (; *msgvec != 0; msgvec++) {
 962                 struct message *mp = message + *msgvec - 1;
 963
 964                 touch(mp);
 965                 printf(" %d", *msgvec);
 966                 if (sendmp(mp, fp, ig, tabst, action, NULL) < 0) {
 967                         perror(tr(70, "temporary mail file"));
 968                         return(-1);
 969                 }
 970         }
 971         printf("\n");
 972         return(0);
 973 }
 974
 975 /*
 976  * Print (continue) when continued after ^Z.
 977  */
 978 /*ARGSUSED*/
 979 static void
 980 collstop(int s)
 981 {
 982         sighandler_type old_action = safe_signal(s, SIG_DFL);
 983         sigset_t nset;
 984
 985         sigemptyset(&nset);
 986         sigaddset(&nset, s);
 987         sigprocmask(SIG_UNBLOCK, &nset, (sigset_t *)NULL);
 988         kill(0, s);
 989         sigprocmask(SIG_BLOCK, &nset, (sigset_t *)NULL);
 990         safe_signal(s, old_action);
 991         if (_coll_jmp_p) {
 992                 _coll_jmp_p = 0;
 993                 _coll_hadintr = 0;
 994                 siglongjmp(_coll_jmp, 1);
 995         }
 996 }
 997
 998 /*
 999  * On interrupt, come here to save the partial message in ~/dead.letter.
1000  * Then jump out of the collection loop.
1001  */
1002 /*ARGSUSED*/
1003 static void
1004 collint(int s)
1005 {
1006         /* the control flow is subtle, because we can be called from ~q */
1007         if (_coll_hadintr == 0) {
1008                 if (ok_blook(ignore)) {
1009                         puts("@");
1010                         fflush(stdout);
1011                         clearerr(stdin);
1012                         return;
1013                 }
1014                 _coll_hadintr = 1;
1015                 siglongjmp(_coll_jmp, 1);
1016         }
1017         exit_status |= 04;
1018         if (ok_blook(save) && s != 0)
1019                 savedeadletter(_coll_fp, 1);
1020         /* Aborting message, no need to fflush() .. */
1021         siglongjmp(_coll_abort, 1);
1022 }
1023
1024 /*ARGSUSED*/
1025 static void
1026 collhup(int s)
1027 {
1028         (void)s;
1029         savedeadletter(_coll_fp, 1);
1030         /*
1031          * Let's pretend nobody else wants to clean up,
1032          * a true statement at this time.
1033          */
1034         exit(1);
1035 }
1036
1037 FL void
1038 savedeadletter(FILE *fp, int fflush_rewind_first)
1039 {
1040         char const *cp;
1041         int c;
1042         FILE *dbuf;
1043         ul_it lines, bytes;
1044
1045         if (fflush_rewind_first) {
1046                 (void)fflush(fp);
1047                 rewind(fp);
1048         }
1049         if (fsize(fp) == 0)
1050                 goto jleave;
1051
1052         cp = getdeadletter();
1053         c = umask(077);
1054         dbuf = Fopen(cp, "a");
1055         umask(c);
1056         if (dbuf == NULL)
1057                 goto jleave;
1058
1059         /*
1060          * There are problems with dup()ing of file-descriptors for child
1061          * processes.  As long as those are not fixed in equal spirit to
1062          * (outof(): FIX and recode.., 2012-10-04), and to avoid reviving of
1063          * bugs like (If *record* is set, avoid writing dead content twice..,
1064          * 2012-09-14), we have to somehow accomplish that the FILE* fp
1065          * makes itself comfortable with the *real* offset of the underlaying
1066          * file descriptor.  Unfortunately Standard I/O and POSIX don't
1067          * describe a way for that -- fflush();rewind(); won't do it.
1068          * This fseek(END),rewind() pair works around the problem on *BSD.
1069          */
1070         (void)fseek(fp, 0, SEEK_END);
1071         rewind(fp);
1072
1073         printf("\"%s\" ", cp);
1074         for (lines = bytes = 0; (c = getc(fp)) != EOF; ++bytes) {
1075                 putc(c, dbuf);
1076                 if (c == '\n')
1077                         ++lines;
1078         }
1079         printf("%lu/%lu\n", lines, bytes);
1080
1081         Fclose(dbuf);
1082         rewind(fp);
1083 jleave: ;
1084 }
1085
1086 static int
1087 putesc(const char *s, FILE *stream)
1088 {
1089         int     n = 0;
1090
1091         while (s[0]) {
1092                 if (s[0] == '\\') {
1093                         if (s[1] == 't') {
1094                                 if (putc('\t', stream) == EOF)
1095                                         return (-1);
1096                                 n++;
1097                                 s += 2;
1098                                 continue;
1099                         }
1100                         if (s[1] == 'n') {
1101                                 if (putc('\n', stream) == EOF)
1102                                         return (-1);
1103                                 n++;
1104                                 s += 2;
1105                                 continue;
1106                         }
1107                 }
1108                 if (putc(s[0], stream) == EOF)
1109                         return (-1);
1110                 n++;
1111                 s++;
1112         }
1113         if (putc('\n', stream) == EOF)
1114                 return (-1);
1115         return (++n);
1116 }