quit.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Termination processing.
   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 #include <fcntl.h>
  45 #include <utime.h>
  46
  47 static char     _mboxname[MAXPATHLEN];  /* Name of mbox */
  48
  49 /* Touch the indicated file */
  50 static void     alter(char const *name);
  51
  52 static int writeback(FILE *res, FILE *obuf);
  53 static void edstop(void);
  54
  55 static void
  56 alter(char const *name)
  57 {
  58         struct stat sb;
  59         struct utimbuf utb;
  60
  61         if (stat(name, &sb))
  62                 return;
  63         utb.actime = time((time_t *)0) + 1;
  64         utb.modtime = sb.st_mtime;
  65         utime(name, &utb);
  66 }
  67
  68 /*
  69  * The "quit" command.
  70  */
  71 /*ARGSUSED*/
  72 FL int
  73 quitcmd(void *v)
  74 {
  75         (void)v;
  76         /*
  77          * If we are sourcing, then return 1 so execute() can handle it.
  78          * Otherwise, return -1 to abort command loop.
  79          */
  80         if (sourcing)
  81                 return 1;
  82         return -1;
  83 }
  84
  85 /*
  86  * Preserve all the appropriate messages back in the system
  87  * mailbox, and print a nice message indicated how many were
  88  * saved.  On any error, just return -1.  Else return 0.
  89  * Incorporate the any new mail that we found.
  90  */
  91 static int
  92 writeback(FILE *res, FILE *obuf)
  93 {
  94         struct message *mp;
  95         int p, c;
  96
  97         p = 0;
  98         if (fseek(obuf, 0L, SEEK_SET) < 0)
  99                 return -1;
 100 #ifndef APPEND
 101         if (res != NULL)
 102                 while ((c = getc(res)) != EOF)
 103                         putc(c, obuf);
 104 #endif
 105         srelax_hold();
 106         for (mp = &message[0]; mp < &message[msgCount]; mp++)
 107                 if ((mp->m_flag&MPRESERVE)||(mp->m_flag&MTOUCH)==0) {
 108                         p++;
 109                         if (sendmp(mp, obuf, NULL, NULL, SEND_MBOX, NULL) < 0) {
 110                                 perror(mailname);
 111                                 (void)fseek(obuf, 0L, SEEK_SET);
 112                                 srelax_rele();
 113                                 return(-1);
 114                         }
 115                         srelax();
 116                 }
 117         srelax_rele();
 118
 119 #ifdef APPEND
 120         if (res != NULL)
 121                 while ((c = getc(res)) != EOF)
 122                         putc(c, obuf);
 123 #endif
 124         fflush(obuf);
 125         ftrunc(obuf);
 126         if (ferror(obuf)) {
 127                 perror(mailname);
 128                 (void)fseek(obuf, 0L, SEEK_SET);
 129                 return(-1);
 130         }
 131         if (res != NULL)
 132                 Fclose(res);
 133         if (fseek(obuf, 0L, SEEK_SET) < 0)
 134                 return -1;
 135         alter(mailname);
 136         if (p == 1)
 137                 printf(tr(155, "Held 1 message in %s\n"), displayname);
 138         else
 139                 printf(tr(156, "Held %d messages in %s\n"), p, displayname);
 140         return 0;
 141 }
 142
 143 /*
 144  * Save all of the undetermined messages at the top of "mbox"
 145  * Save all untouched messages back in the system mailbox.
 146  * Remove the system mailbox, if none saved there.
 147  */
 148 FL void
 149 quit(void)
 150 {
 151         int p, modify, anystat;
 152         FILE *fbuf, *rbuf, *abuf;
 153         struct message *mp;
 154         int c;
 155         char *tempResid;
 156         struct stat minfo;
 157
 158         /*
 159          * If we are read only, we can't do anything,
 160          * so just return quickly. IMAP can set some
 161          * flags (e.g. "\\Seen") so imap_quit must be
 162          * called even then.
 163          */
 164         if (mb.mb_perm == 0 && mb.mb_type != MB_IMAP)
 165                 return;
 166         /* TODO lex.c:setfile() has just called hold_sigs(); before it called
 167          * TODO us, but this causes uninterruptible hangs due to blocked sigs
 168          * TODO anywhere except for MB_FILE (all others install their own
 169          * TODO handlers, as it seems, properly); marked YYY */
 170         switch (mb.mb_type) {
 171         case MB_FILE:
 172                 break;
 173         case MB_MAILDIR:
 174                 rele_sigs(); /* YYY */
 175                 maildir_quit();
 176                 hold_sigs(); /* YYY */
 177                 return;
 178 #ifdef HAVE_POP3
 179         case MB_POP3:
 180                 rele_sigs(); /* YYY */
 181                 pop3_quit();
 182                 hold_sigs(); /* YYY */
 183                 return;
 184 #endif
 185 #ifdef HAVE_IMAP
 186         case MB_IMAP:
 187         case MB_CACHE:
 188                 rele_sigs(); /* YYY */
 189                 imap_quit();
 190                 hold_sigs(); /* YYY */
 191                 return;
 192 #endif
 193         case MB_VOID:
 194         default:
 195                 return;
 196         }
 197         /*
 198          * If editing (not reading system mail box), then do the work
 199          * in edstop()
 200          */
 201         if (edit) {
 202                 edstop();
 203                 return;
 204         }
 205
 206         /*
 207          * See if there any messages to save in mbox.  If no, we
 208          * can save copying mbox to /tmp and back.
 209          *
 210          * Check also to see if any files need to be preserved.
 211          * Delete all untouched messages to keep them out of mbox.
 212          * If all the messages are to be preserved, just exit with
 213          * a message.
 214          */
 215
 216         fbuf = Zopen(mailname, "r+", &mb.mb_compressed);
 217         if (fbuf == NULL) {
 218                 if (errno == ENOENT)
 219                         return;
 220                 goto newmail;
 221         }
 222         if (fcntl_lock(fileno(fbuf), F_WRLCK) == -1) {
 223 nolock:
 224                 perror(tr(157, "Unable to lock mailbox"));
 225                 Fclose(fbuf);
 226                 return;
 227         }
 228         if (dot_lock(mailname, fileno(fbuf), 1, stdout, ".") == -1)
 229                 goto nolock;
 230         rbuf = NULL;
 231         if (fstat(fileno(fbuf), &minfo) >= 0 && minfo.st_size > mailsize) {
 232                 printf(tr(158, "New mail has arrived.\n"));
 233                 rbuf = Ftemp(&tempResid, "Rq", "w", 0600, 1);
 234                 if (rbuf == NULL || fbuf == NULL)
 235                         goto newmail;
 236 #ifdef APPEND
 237                 fseek(fbuf, (long)mailsize, SEEK_SET);
 238                 while ((c = getc(fbuf)) != EOF)
 239                         putc(c, rbuf);
 240 #else
 241                 p = minfo.st_size - mailsize;
 242                 while (p-- > 0) {
 243                         c = getc(fbuf);
 244                         if (c == EOF)
 245                                 goto newmail;
 246                         putc(c, rbuf);
 247                 }
 248 #endif
 249                 Fclose(rbuf);
 250                 if ((rbuf = Fopen(tempResid, "r")) == NULL)
 251                         goto newmail;
 252                 rm(tempResid);
 253                 Ftfree(&tempResid);
 254         }
 255
 256         anystat = holdbits();
 257         modify = 0;
 258         for (c = 0, p = 0, mp = &message[0]; mp < &message[msgCount]; mp++) {
 259                 if (mp->m_flag & MBOX)
 260                         c++;
 261                 if (mp->m_flag & MPRESERVE)
 262                         p++;
 263                 if (mp->m_flag & MODIFY)
 264                         modify++;
 265         }
 266         if (p == msgCount && !modify && !anystat) {
 267                 if (p == 1)
 268                         printf(tr(155, "Held 1 message in %s\n"), displayname);
 269                 else if (p > 1)
 270                         printf(tr(156, "Held %d messages in %s\n"),
 271                                 p, displayname);
 272                 Fclose(fbuf);
 273                 dot_unlock(mailname);
 274                 return;
 275         }
 276         if (c == 0) {
 277                 if (p != 0) {
 278                         writeback(rbuf, fbuf);
 279                         Fclose(fbuf);
 280                         dot_unlock(mailname);
 281                         return;
 282                 }
 283                 goto cream;
 284         }
 285
 286         if (makembox() == STOP) {
 287                 Fclose(fbuf);
 288                 dot_unlock(mailname);
 289                 return;
 290         }
 291         /*
 292          * Now we are ready to copy back preserved files to
 293          * the system mailbox, if any were requested.
 294          */
 295
 296         if (p != 0) {
 297                 writeback(rbuf, fbuf);
 298                 Fclose(fbuf);
 299                 dot_unlock(mailname);
 300                 return;
 301         }
 302
 303         /*
 304          * Finally, remove his /usr/mail file.
 305          * If new mail has arrived, copy it back.
 306          */
 307
 308 cream:
 309         if (rbuf != NULL) {
 310                 abuf = fbuf;
 311                 fseek(abuf, 0L, SEEK_SET);
 312                 while ((c = getc(rbuf)) != EOF)
 313                         putc(c, abuf);
 314                 Fclose(rbuf);
 315                 ftrunc(abuf);
 316                 alter(mailname);
 317                 Fclose(fbuf);
 318                 dot_unlock(mailname);
 319                 return;
 320         }
 321         demail();
 322         Fclose(fbuf);
 323         dot_unlock(mailname);
 324         return;
 325
 326 newmail:
 327         printf(tr(166, "Thou hast new mail.\n"));
 328         if (fbuf != NULL) {
 329                 Fclose(fbuf);
 330                 dot_unlock(mailname);
 331         }
 332 }
 333
 334 /*
 335  * Adjust the message flags in each message.
 336  */
 337 FL int
 338 holdbits(void)
 339 {
 340         struct message *mp;
 341         int anystat, autohold, holdbit, nohold;
 342
 343         anystat = 0;
 344         autohold = value("hold") != NULL;
 345         holdbit = autohold ? MPRESERVE : MBOX;
 346         nohold = MBOX|MSAVED|MDELETED|MPRESERVE;
 347         if (value("keepsave") != NULL)
 348                 nohold &= ~MSAVED;
 349         for (mp = &message[0]; mp < &message[msgCount]; mp++) {
 350                 if (mp->m_flag & MNEW) {
 351                         mp->m_flag &= ~MNEW;
 352                         mp->m_flag |= MSTATUS;
 353                 }
 354                 if (mp->m_flag & (MSTATUS|MFLAG|MUNFLAG|MANSWER|MUNANSWER|
 355                                         MDRAFT|MUNDRAFT))
 356                         anystat++;
 357                 if ((mp->m_flag & MTOUCH) == 0)
 358                         mp->m_flag |= MPRESERVE;
 359                 if ((mp->m_flag & nohold) == 0)
 360                         mp->m_flag |= holdbit;
 361         }
 362         return anystat;
 363 }
 364
 365 FL void
 366 save_mbox_for_possible_quitstuff(void) /* TODO try to get rid of that */
 367 {
 368         char const *cp;
 369
 370         if ((cp = expand("&")) == NULL)
 371                 cp = "";
 372         n_strlcpy(_mboxname, cp, sizeof _mboxname);
 373 }
 374
 375 /*
 376  * Create another temporary file and copy user's mbox file
 377  * darin.  If there is no mbox, copy nothing.
 378  * If he has specified "append" don't copy his mailbox,
 379  * just copy saveable entries at the end.
 380  */
 381 FL enum okay
 382 makembox(void)
 383 {
 384         struct message *mp;
 385         char *mbox, *tempQuit;
 386         int mcount, c;
 387         FILE *ibuf = NULL, *obuf, *abuf;
 388         enum protocol   prot;
 389
 390         mbox = _mboxname;
 391         mcount = 0;
 392         if (value("append") == NULL) {
 393                 if ((obuf = Ftemp(&tempQuit, "Rm", "w", 0600, 1)) == NULL) {
 394                         perror(tr(163, "temporary mail quit file"));
 395                         return STOP;
 396                 }
 397                 if ((ibuf = Fopen(tempQuit, "r")) == NULL) {
 398                         perror(tempQuit);
 399                         Fclose(obuf);
 400                 }
 401                 rm(tempQuit);
 402                 Ftfree(&tempQuit);
 403                 if (ibuf == NULL)
 404                         return STOP;
 405
 406                 if ((abuf = Zopen(mbox, "r", NULL)) != NULL) {
 407                         while ((c = getc(abuf)) != EOF)
 408                                 putc(c, obuf);
 409                         Fclose(abuf);
 410                 }
 411                 if (ferror(obuf)) {
 412                         perror(tr(163, "temporary mail quit file"));
 413                         Fclose(ibuf);
 414                         Fclose(obuf);
 415                         return STOP;
 416                 }
 417                 Fclose(obuf);
 418
 419                 if ((c = open(mbox, O_CREAT|O_TRUNC|O_WRONLY, 0600)) >= 0)
 420                         close(c);
 421                 if ((obuf = Zopen(mbox, "r+", NULL)) == NULL) {
 422                         perror(mbox);
 423                         Fclose(ibuf);
 424                         return STOP;
 425                 }
 426         }
 427         else {
 428                 if ((obuf = Zopen(mbox, "a", NULL)) == NULL) {
 429                         perror(mbox);
 430                         return STOP;
 431                 }
 432                 fchmod(fileno(obuf), 0600);
 433         }
 434
 435         srelax_hold();
 436         prot = which_protocol(mbox);
 437         for (mp = &message[0]; mp < &message[msgCount]; mp++) {
 438                 if (mp->m_flag & MBOX) {
 439                         mcount++;
 440                         if (prot == PROTO_IMAP &&
 441                                         saveignore[0].i_count == 0 &&
 442                                         saveignore[1].i_count == 0
 443 #ifdef HAVE_IMAP /* TODO revisit */
 444                                         && imap_thisaccount(mbox)
 445 #endif
 446                         ) {
 447 #ifdef HAVE_IMAP
 448                                 if (imap_copy(mp, mp-message+1, mbox) == STOP)
 449 #endif
 450                                         goto jerr;
 451                         } else if (sendmp(mp, obuf, saveignore,
 452                                                 NULL, SEND_MBOX, NULL) < 0) {
 453                                 perror(mbox);
 454 jerr:
 455                                 if (ibuf)
 456                                         Fclose(ibuf);
 457                                 Fclose(obuf);
 458                                 srelax_rele();
 459                                 return STOP;
 460                         }
 461                         mp->m_flag |= MBOXED;
 462                         srelax();
 463                 }
 464         }
 465         srelax_rele();
 466
 467         /*
 468          * Copy the user's old mbox contents back
 469          * to the end of the stuff we just saved.
 470          * If we are appending, this is unnecessary.
 471          */
 472
 473         if (value("append") == NULL) {
 474                 rewind(ibuf);
 475                 c = getc(ibuf);
 476                 while (c != EOF) {
 477                         putc(c, obuf);
 478                         if (ferror(obuf))
 479                                 break;
 480                         c = getc(ibuf);
 481                 }
 482                 Fclose(ibuf);
 483                 fflush(obuf);
 484         }
 485         ftrunc(obuf);
 486         if (ferror(obuf)) {
 487                 perror(mbox);
 488                 Fclose(obuf);
 489                 return STOP;
 490         }
 491         if (Fclose(obuf) != 0) {
 492                 if (prot != PROTO_IMAP)
 493                         perror(mbox);
 494                 return STOP;
 495         }
 496         if (mcount == 1)
 497                 printf(tr(164, "Saved 1 message in mbox\n"));
 498         else
 499                 printf(tr(165, "Saved %d messages in mbox\n"), mcount);
 500         return OKAY;
 501 }
 502
 503 /*
 504  * Terminate an editing session by attempting to write out the user's
 505  * file from the temporary.  Save any new stuff appended to the file.
 506  */
 507 static void
 508 edstop(void)
 509 {
 510         int gotcha, c;
 511         struct message *mp;
 512         FILE *obuf, *ibuf = NULL;
 513         struct stat statb;
 514
 515         if (mb.mb_perm == 0)
 516                 return;
 517         hold_sigs();
 518         for (mp = &message[0], gotcha = 0; mp < &message[msgCount]; mp++) {
 519                 if (mp->m_flag & MNEW) {
 520                         mp->m_flag &= ~MNEW;
 521                         mp->m_flag |= MSTATUS;
 522                 }
 523                 if (mp->m_flag & (MODIFY|MDELETED|MSTATUS|MFLAG|MUNFLAG|
 524                                         MANSWER|MUNANSWER|MDRAFT|MUNDRAFT))
 525                         gotcha++;
 526         }
 527         if (!gotcha)
 528                 goto done;
 529         ibuf = NULL;
 530         if (stat(mailname, &statb) >= 0 && statb.st_size > mailsize) {
 531                 char *tempname;
 532
 533                 if ((obuf = Ftemp(&tempname, "edstop", "w", 0600, 1)) == NULL) {
 534                         perror(tr(167, "tmpfile"));
 535                         rele_sigs();
 536                         reset(0);
 537                 }
 538                 if ((ibuf = Zopen(mailname, "r", &mb.mb_compressed)) == NULL) {
 539                         perror(mailname);
 540                         Fclose(obuf);
 541                         rm(tempname);
 542                         Ftfree(&tempname);
 543                         rele_sigs();
 544                         reset(0);
 545                 }
 546                 fseek(ibuf, (long)mailsize, SEEK_SET);
 547                 while ((c = getc(ibuf)) != EOF)
 548                         putc(c, obuf);
 549                 Fclose(ibuf);
 550                 Fclose(obuf);
 551                 if ((ibuf = Fopen(tempname, "r")) == NULL) {
 552                         perror(tempname);
 553                         rm(tempname);
 554                         Ftfree(&tempname);
 555                         rele_sigs();
 556                         reset(0);
 557                 }
 558                 rm(tempname);
 559                 Ftfree(&tempname);
 560         }
 561         printf(tr(168, "\"%s\" "), displayname);
 562         fflush(stdout);
 563         if ((obuf = Zopen(mailname, "r+", &mb.mb_compressed)) == NULL) {
 564                 perror(mailname);
 565                 rele_sigs();
 566                 reset(0);
 567         }
 568         ftrunc(obuf);
 569
 570         srelax_hold();
 571         c = 0;
 572         for (mp = &message[0]; mp < &message[msgCount]; mp++) {
 573                 if ((mp->m_flag & MDELETED) != 0)
 574                         continue;
 575                 c++;
 576                 if (sendmp(mp, obuf, NULL, NULL, SEND_MBOX, NULL) < 0) {
 577                         perror(mailname);
 578                         rele_sigs();
 579                         srelax_rele();
 580                         reset(0);/* XXX jump aways are terrible */
 581                 }
 582                 srelax();
 583         }
 584         srelax_rele();
 585
 586         gotcha = (c == 0 && ibuf == NULL);
 587         if (ibuf != NULL) {
 588                 while ((c = getc(ibuf)) != EOF)
 589                         putc(c, obuf);
 590                 Fclose(ibuf);
 591         }
 592         fflush(obuf);
 593         if (ferror(obuf)) {
 594                 perror(mailname);
 595                 rele_sigs();
 596                 reset(0);
 597         }
 598         Fclose(obuf);
 599         if (gotcha && value("emptybox") == NULL) {
 600                 rm(mailname);
 601                 printf((value("bsdcompat") || value("bsdmsgs"))
 602                         ? tr(169, "removed\n") : tr(211, "removed.\n"));
 603         } else
 604                 printf((value("bsdcompat") || value("bsdmsgs"))
 605                         ? tr(170, "complete\n") : tr(212, "updated.\n"));
 606         fflush(stdout);
 607
 608 done:
 609         rele_sigs();
 610 }
 611
 612 enum quitflags {
 613         QUITFLAG_HOLD      = 001,
 614         QUITFLAG_KEEPSAVE  = 002,
 615         QUITFLAG_APPEND    = 004,
 616         QUITFLAG_EMPTYBOX  = 010
 617 };
 618
 619 static const struct quitnames {
 620         enum quitflags  flag;
 621         const char      *name;
 622 } quitnames[] = {
 623         { QUITFLAG_HOLD,        "hold" },
 624         { QUITFLAG_KEEPSAVE,    "keepsave" },
 625         { QUITFLAG_APPEND,      "append" },
 626         { QUITFLAG_EMPTYBOX,    "emptybox" },
 627         { 0,                    NULL }
 628 };
 629
 630 FL int
 631 savequitflags(void)
 632 {
 633         enum quitflags  qf = 0;
 634         int     i;
 635
 636         for (i = 0; quitnames[i].name; i++)
 637                 if (value(quitnames[i].name))
 638                         qf |= quitnames[i].flag;
 639         return qf;
 640 }
 641
 642 FL void
 643 restorequitflags(int qf)
 644 {
 645         int     i;
 646
 647         for (i = 0; quitnames[i].name; i++)
 648                 if (qf & quitnames[i].flag) {
 649                         if (value(quitnames[i].name) == NULL)
 650                                 assign(quitnames[i].name, "");
 651                 } else if (value(quitnames[i].name))
 652                         unset_internal(quitnames[i].name);
 653 }