diplodocus.org Git - nmh/blob - uip/dropsbr.c

   1
   2 /*
   3  * dropsbr.c -- create/read/manipulate mail drops
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/nmh.h>
  11 #include <h/utils.h>
  12
  13 #include <h/mh.h>
  14 #include <h/dropsbr.h>
  15 #include <h/mts.h>
  16 #include <h/tws.h>
  17
  18 #ifdef NTOHLSWAP
  19 # include <netinet/in.h>
  20 #else
  21 # undef ntohl
  22 # define ntohl(n) (n)
  23 #endif
  24
  25 #include <fcntl.h>
  26
  27 /*
  28  * static prototypes
  29  */
  30 static int mbx_chk_mbox (int);
  31 static int mbx_chk_mmdf (int);
  32 static int map_open (char *, int);
  33
  34
  35 /*
  36  * Main entry point to open/create and lock
  37  * a file or maildrop.
  38  */
  39
  40 int
  41 mbx_open (char *file, int mbx_style, uid_t uid, gid_t gid, mode_t mode)
  42 {
  43     int j, count, fd = NOTOK;
  44     struct stat st;
  45
  46     j = 0;
  47
  48     /* attempt to open and lock file */
  49     for (count = 4; count > 0; count--) {
  50         int failed_to_lock = 0;
  51         if ((fd = lkopenspool (file, O_RDWR | O_CREAT |
  52                                O_NONBLOCK, mode, &failed_to_lock)) == NOTOK) {
  53             if (failed_to_lock) {
  54                 j = errno;
  55                 sleep (5);
  56                 continue;
  57             } else {
  58                 return NOTOK;
  59             }
  60         }
  61
  62         /* good file descriptor */
  63         break;
  64     }
  65
  66     errno = j;
  67
  68     /*
  69      * Return if we still failed after 4 attempts,
  70      * or we just want to skip the sanity checks.
  71      */
  72     if (fd == NOTOK || mbx_style == OTHER_FORMAT)
  73         return fd;
  74
  75     /*
  76      * Do sanity checks on maildrop.
  77      */
  78     if (fstat (fd, &st) == NOTOK) {
  79         /*
  80          * The stat failed.  So we make sure file
  81          * has right ownership/modes
  82          */
  83         if (chown (file, uid, gid) < 0) {
  84             advise (file, "chown");
  85         }
  86         if (chmod (file, mode) < 0) {
  87             advise (file, "chmod");
  88         }
  89     } else if (st.st_size > (off_t) 0) {
  90         int status;
  91
  92         /* check the maildrop */
  93         switch (mbx_style) {
  94             case MMDF_FORMAT:
  95             default:
  96                 status = mbx_chk_mmdf (fd);
  97                 break;
  98
  99             case MBOX_FORMAT:
 100                 status = mbx_chk_mbox (fd);
 101                 break;
 102         }
 103
 104         /* if error, attempt to close it */
 105         if (status == NOTOK) {
 106             close (fd);
 107             return NOTOK;
 108         }
 109     }
 110
 111     return fd;
 112 }
 113
 114
 115 /*
 116  * Check/prepare MBOX style maildrop for appending.
 117  */
 118
 119 static int
 120 mbx_chk_mbox (int fd)
 121 {
 122     /* just seek to the end */
 123     if (lseek (fd, (off_t) 0, SEEK_END) == (off_t) NOTOK)
 124         return NOTOK;
 125
 126     return OK;
 127 }
 128
 129
 130 /*
 131  * Check/prepare MMDF style maildrop for appending.
 132  */
 133
 134 static int
 135 mbx_chk_mmdf (int fd)
 136 {
 137     ssize_t count;
 138     char ldelim[BUFSIZ];
 139
 140     count = strlen (mmdlm2);
 141
 142     if (lseek (fd, -count, SEEK_END) == (off_t) NOTOK)
 143         return NOTOK;
 144     if (read (fd, ldelim, count) != count)
 145         return NOTOK;
 146
 147     ldelim[count] = 0;
 148
 149     if (strcmp (ldelim, mmdlm2)
 150             && write (fd, "\n", 1) != 1
 151             && write (fd, mmdlm2, count) != count)
 152         return NOTOK;
 153
 154     return OK;
 155 }
 156
 157
 158 int
 159 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
 160 {
 161     register int len, size;
 162     register long ld1, ld2;
 163     register char *bp;
 164     char buffer[BUFSIZ];
 165     register struct drop *cp, *dp, *ep, *pp;
 166
 167     pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
 168     if (pp == NULL) {
 169         if (noisy)
 170             admonish (NULL, "unable to allocate drop storage");
 171         return NOTOK;
 172     }
 173
 174     ld1 = (long) strlen (mmdlm1);
 175     ld2 = (long) strlen (mmdlm2);
 176
 177     fseek (fp, pos, SEEK_SET);
 178     for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
 179         size = 0;
 180         if (strcmp (buffer, mmdlm1) == 0)
 181             pos += ld1, dp->d_start = (long) pos;
 182         else {
 183             dp->d_start = (long)pos , pos += (long) strlen (buffer);
 184             for (bp = buffer; *bp; bp++, size++)
 185                 if (*bp == '\n')
 186                     size++;
 187         }
 188
 189         while (fgets (buffer, sizeof(buffer), fp) != NULL)
 190             if (strcmp (buffer, mmdlm2) == 0)
 191                 break;
 192             else {
 193                 pos += (long) strlen (buffer);
 194                 for (bp = buffer; *bp; bp++, size++)
 195                     if (*bp == '\n')
 196                         size++;
 197             }
 198
 199         if (dp->d_start != (long) pos) {
 200             dp->d_id = 0;
 201             dp->d_size = (long) size;
 202             dp->d_stop = pos;
 203             dp++;
 204         }
 205         pos += ld2;
 206
 207         if (dp >= ep) {
 208             register int    curlen = dp - pp;
 209
 210             cp = (struct drop *) mh_xrealloc ((char *) pp,
 211                                     (size_t) (len += MAXFOLDER) * sizeof(*pp));
 212             dp = cp + curlen, ep = (pp = cp) + len - 1;
 213         }
 214     }
 215
 216     if (dp == pp)
 217         free ((char *) pp);
 218     else
 219         *drops = pp;
 220     return (dp - pp);
 221 }
 222
 223
 224 int
 225 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
 226            long pos, off_t stop, int mapping, int noisy)
 227 {
 228     register int i, j, size;
 229     off_t start;
 230     long off;
 231     register char *cp;
 232     char buffer[BUFSIZ];
 233
 234     off = (long) lseek (md, (off_t) 0, SEEK_CUR);
 235     j = strlen (mmdlm1);
 236     if (write (md, mmdlm1, j) != j)
 237         return NOTOK;
 238     start = lseek (md, (off_t) 0, SEEK_CUR);
 239     size = 0;
 240
 241     fseek (fp, pos, SEEK_SET);
 242     while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
 243         i = strlen (buffer);
 244         for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 245             continue;
 246         for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
 247             continue;
 248         if (write (md, buffer, i) != i)
 249             return NOTOK;
 250         pos += (long) i;
 251         if (mapping)
 252             for (cp = buffer; i-- > 0; size++)
 253                 if (*cp++ == '\n')
 254                     size++;
 255     }
 256
 257     stop = lseek (md, (off_t) 0, SEEK_CUR);
 258     j = strlen (mmdlm2);
 259     if (write (md, mmdlm2, j) != j)
 260         return NOTOK;
 261     if (mapping)
 262         map_write (mailbox, md, id, last, start, stop, off, size, noisy);
 263
 264     return OK;
 265 }
 266
 267
 268 /*
 269  * Append message to end of file or maildrop.
 270  */
 271
 272 int
 273 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
 274           int mapping, char *text, int noisy)
 275 {
 276     int i, j, size;
 277     off_t start, stop;
 278     long pos;
 279     char *cp, buffer[BUFSIZ];
 280     FILE *fp;
 281
 282     pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
 283     size = 0;
 284
 285     switch (mbx_style) {
 286         case MMDF_FORMAT:
 287         default:
 288             j = strlen (mmdlm1);
 289             if (write (md, mmdlm1, j) != j)
 290                 return NOTOK;
 291             start = lseek (md, (off_t) 0, SEEK_CUR);
 292
 293             if (text) {
 294                 i = strlen (text);
 295                 if (write (md, text, i) != i)
 296                     return NOTOK;
 297                 for (cp = text; *cp++; size++)
 298                     if (*cp == '\n')
 299                         size++;
 300             }
 301
 302             while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
 303                 /* valgrind noticed that stringdex depends on null
 304                    termination. */
 305                 buffer[i] = '\0';
 306
 307                 for (j = 0;
 308                         (j = stringdex (mmdlm1, buffer)) >= 0;
 309                         buffer[j]++)
 310                     continue;
 311                 for (j = 0;
 312                         (j = stringdex (mmdlm2, buffer)) >= 0;
 313                         buffer[j]++)
 314                     continue;
 315                 if (write (md, buffer, i) != i)
 316                     return NOTOK;
 317                 if (mapping)
 318                     for (cp = buffer; i-- > 0; size++)
 319                         if (*cp++ == '\n')
 320                             size++;
 321             }
 322
 323             stop = lseek (md, (off_t) 0, SEEK_CUR);
 324             j = strlen (mmdlm2);
 325             if (write (md, mmdlm2, j) != j)
 326                 return NOTOK;
 327             if (mapping)
 328                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 329
 330             return (i != NOTOK ? OK : NOTOK);
 331
 332         case MBOX_FORMAT:
 333             if ((j = dup (fd)) == NOTOK)
 334                 return NOTOK;
 335             if ((fp = fdopen (j, "r")) == NULL) {
 336                 close (j);
 337                 return NOTOK;
 338             }
 339             start = lseek (md, (off_t) 0, SEEK_CUR);
 340
 341             /* If text is given, we add it to top of message */
 342             if (text) {
 343                 i = strlen (text);
 344                 if (write (md, text, i) != i)
 345                     return NOTOK;
 346                 for (cp = text; *cp++; size++)
 347                     if (*cp == '\n')
 348                         size++;
 349             }
 350
 351             for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
 352
 353                 /*
 354                  * Check the first line, and make some changes.
 355                  */
 356                 if (j == 0 && !text) {
 357                     /*
 358                      * Change the "Return-Path:" field (if in first line)
 359                      * back to "From ".
 360                      */
 361                     if (!strncmp (buffer, "Return-Path:", 12)) {
 362                         char tmpbuffer[BUFSIZ];
 363                         char *tp, *ep, *fp;
 364
 365                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 366                         ep = tmpbuffer + 13;
 367                         if (!(fp = strchr(ep + 1, ' ')))
 368                             fp = strchr(ep + 1, '\n');
 369                         tp = dctime(dlocaltimenow());
 370                         snprintf (buffer, sizeof(buffer), "From %.*s  %s",
 371                                 (int)(fp - ep), ep, tp);
 372                     } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
 373                         /*
 374                          * Change the "X-Envelope-From:" field
 375                          * (if first line) back to "From ".
 376                          */
 377                         char tmpbuffer[BUFSIZ];
 378                         char *ep;
 379
 380                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 381                         ep = tmpbuffer + 17;
 382                         snprintf (buffer, sizeof(buffer), "From %s", ep);
 383                     } else if (strncmp (buffer, "From ", 5)) {
 384                         /*
 385                          * If there is already a "From " line,
 386                          * then leave it alone.  Else we add one.
 387                          */
 388                         char tmpbuffer[BUFSIZ];
 389                         char *tp, *ep;
 390
 391                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 392                         ep = "nobody@nowhere";
 393                         tp = dctime(dlocaltimenow());
 394                         snprintf (buffer, sizeof(buffer), "From %s  %s%s", ep, tp, tmpbuffer);
 395                     }
 396                 }
 397
 398                 /*
 399                  * If this is not first line, and begins with
 400                  * "From ", then prepend line with ">".
 401                  */
 402                 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
 403                     if (write (md, ">", 1) < 0) {
 404                         advise (mailbox, "write");
 405                     }
 406                     size++;
 407                 }
 408                 i = strlen (buffer);
 409                 if (write (md, buffer, i) != i) {
 410                     fclose (fp);
 411                     return NOTOK;
 412                 }
 413                 if (mapping)
 414                     for (cp = buffer; i-- > 0; size++)
 415                         if (*cp++ == '\n')
 416                             size++;
 417             }
 418             if (write (md, "\n", 1) != 1) {
 419                 fclose (fp);
 420                 return NOTOK;
 421             }
 422             if (mapping)
 423                 size += 2;
 424
 425             fclose (fp);
 426             lseek (fd, (off_t) 0, SEEK_END);
 427             stop = lseek (md, (off_t) 0, SEEK_CUR);
 428             if (mapping)
 429                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 430
 431             return OK;
 432     }
 433 }
 434
 435
 436 int
 437 mbx_size (int md, off_t start, off_t stop)
 438 {
 439     register int i, fd;
 440     register long pos;
 441     register FILE *fp;
 442
 443     if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
 444         if (fd != NOTOK)
 445             close (fd);
 446         return NOTOK;
 447     }
 448
 449     fseek (fp, start, SEEK_SET);
 450     for (i = 0, pos = stop - start; pos-- > 0; i++)
 451         if (fgetc (fp) == '\n')
 452             i++;
 453
 454     fclose (fp);
 455     return i;
 456 }
 457
 458
 459 /*
 460  * Close and unlock file/maildrop.
 461  */
 462
 463 int
 464 mbx_close (char *mailbox, int md)
 465 {
 466     if (lkclosespool (md, mailbox) == 0)
 467         return OK;
 468     return NOTOK;
 469 }
 470
 471
 472 /*
 473  * This function is performed implicitly by getbbent.c:
 474  *     bb->bb_map = map_name (bb->bb_file);
 475  */
 476
 477 char *
 478 map_name (char *file)
 479 {
 480     register char *cp, *dp;
 481     static char buffer[BUFSIZ];
 482
 483     if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
 484         dp = cp + strlen (cp);
 485     if (cp == file)
 486         snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
 487     else
 488         snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
 489                 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
 490
 491     return buffer;
 492 }
 493
 494
 495 int
 496 map_read (char *file, long pos, struct drop **drops, int noisy)
 497 {
 498     register int i, md, msgp;
 499     register char *cp;
 500     struct drop d;
 501     register struct drop *mp, *dp;
 502
 503     if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
 504             || map_chk (cp, md, mp = &d, pos, noisy)) {
 505         if (md != NOTOK)
 506             close (md);
 507         return 0;
 508     }
 509
 510     msgp = mp->d_id;
 511     dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
 512     if (dp == NULL) {
 513         close (md);
 514         return 0;
 515     }
 516
 517     memcpy((char *) dp, (char *) mp, sizeof(*dp));
 518
 519     lseek (md, (off_t) sizeof(*mp), SEEK_SET);
 520     if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) <
 521         (int) sizeof(*dp)) {
 522         i = 0;
 523         free ((char *) dp);
 524     } else {
 525 #ifdef NTOHLSWAP
 526         register struct drop *tdp;
 527         int j;
 528
 529         for (j = 0, tdp = dp; j < i / sizeof(*dp); j++, tdp++) {
 530             tdp->d_id = ntohl(tdp->d_id);
 531             tdp->d_size = ntohl(tdp->d_size);
 532             tdp->d_start = ntohl(tdp->d_start);
 533             tdp->d_stop = ntohl(tdp->d_stop);
 534         }
 535 #endif
 536         *drops = dp;
 537     }
 538
 539     close (md);
 540
 541     return (i / sizeof(*dp));
 542 }
 543
 544
 545 int
 546 map_write (char *mailbox, int md, int id, long last, off_t start,
 547            off_t stop, long pos, int size, int noisy)
 548 {
 549     register int i;
 550     int clear, fd, td;
 551     char *file;
 552     register struct drop *dp;
 553     struct drop d1, d2, *rp;
 554     register FILE *fp;
 555     struct stat st;
 556
 557     if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
 558         return NOTOK;
 559
 560     if ((fstat (fd, &st) == OK) && (st.st_size > 0))
 561         clear = 0;
 562     else
 563         clear = 1;
 564
 565     if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
 566         (void) m_unlink (file);
 567         mbx_close (file, fd);
 568         if ((fd = map_open (file, md)) == NOTOK)
 569             return NOTOK;
 570         clear++;
 571     }
 572
 573     if (clear) {
 574         if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
 575             if (noisy)
 576                 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
 577             if (td != NOTOK)
 578                 close (td);
 579             mbx_close (file, fd);
 580             return NOTOK;
 581         }
 582
 583         switch (i = mbx_read (fp, 0, &rp, noisy)) {
 584             case NOTOK:
 585                 fclose (fp);
 586                 mbx_close (file, fd);
 587                 return NOTOK;
 588
 589             case OK:
 590                 fclose (fp);
 591                 break;
 592
 593             default:
 594                 d1.d_id = 0;
 595                 for (dp = rp; i-- >0; dp++) {
 596                     if (dp->d_start == start)
 597                         dp->d_id = id;
 598                     lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 599                     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 600                         if (noisy)
 601                             admonish (file, "write error");
 602                         mbx_close (file, fd);
 603                         fclose (fp);
 604                         return NOTOK;
 605                     }
 606                 }
 607                 free ((char *) rp);
 608                 fclose (fp);
 609                 break;
 610         }
 611     }
 612     else {
 613         if (last == 0)
 614             last = d1.d_start;
 615         dp = &d2;
 616         dp->d_id = id;
 617         dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
 618         dp->d_start = start;
 619         dp->d_stop = stop;
 620         lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 621         if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 622             if (noisy)
 623                 admonish (file, "write error");
 624             mbx_close (file, fd);
 625             return NOTOK;
 626         }
 627     }
 628
 629     dp = &d1;
 630     dp->d_size = DRVRSN;
 631     dp->d_start = (long) last;
 632     dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
 633
 634     lseek (fd, (off_t) 0, SEEK_SET);
 635     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 636         if (noisy)
 637             admonish (file, "write error");
 638         mbx_close (file, fd);
 639         return NOTOK;
 640     }
 641
 642     mbx_close (file, fd);
 643
 644     return OK;
 645 }
 646
 647
 648 static int
 649 map_open (char *file, int md)
 650 {
 651     mode_t mode;
 652     struct stat st;
 653
 654     mode = fstat (md, &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot ();
 655     return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
 656 }
 657
 658
 659 int
 660 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
 661 {
 662     ssize_t count;
 663     struct drop d, tmpd;
 664     register struct drop *dl;
 665
 666     if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
 667 #ifdef notdef
 668         admonish (NULL, "%s: missing or partial index", file);
 669 #endif /* notdef */
 670         return NOTOK;
 671     }
 672 #ifndef NTOHLSWAP
 673     *dp = tmpd;         /* if ntohl(n)=(n), can use struct assign */
 674 #else
 675     dp->d_id    = ntohl(tmpd.d_id);
 676     dp->d_size  = ntohl(tmpd.d_size);
 677     dp->d_start = ntohl(tmpd.d_start);
 678     dp->d_stop  = ntohl(tmpd.d_stop);
 679 #endif
 680
 681     if (dp->d_size != DRVRSN) {
 682         if (noisy)
 683             admonish (NULL, "%s: version mismatch (%d != %d)", file,
 684                                 dp->d_size, DRVRSN);
 685         return NOTOK;
 686     }
 687
 688     if (dp->d_stop != pos) {
 689         if (noisy && pos != (long) 0)
 690             admonish (NULL,
 691                     "%s: pointer mismatch or incomplete index (%ld!=%ld)",
 692                     file, dp->d_stop, (long) pos);
 693         return NOTOK;
 694     }
 695
 696     if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
 697         if (noisy)
 698             admonish (NULL, "%s: corrupt index(1)", file);
 699         return NOTOK;
 700     }
 701
 702     dl = &d;
 703     count = strlen (mmdlm2);
 704     lseek (fd, (off_t) (dp->d_id * sizeof(*dp)), SEEK_SET);
 705     if (read (fd, (char *) dl, sizeof(*dl)) != sizeof(*dl)
 706             || (ntohl(dl->d_stop) != dp->d_stop
 707                 && ntohl(dl->d_stop) + count != dp->d_stop)) {
 708         if (noisy)
 709             admonish (NULL, "%s: corrupt index(2)", file);
 710         return NOTOK;
 711     }
 712
 713     return OK;
 714 }