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         if ((fd = lkopenspool (file, O_RDWR | O_CREAT |
  51                                O_NONBLOCK, mode)) == NOTOK) {
  52             switch (errno) {
  53 #if defined(FCNTL_LOCKING) || defined(LOCKF_LOCKING)
  54                 case EACCES:
  55                 case EAGAIN:
  56 #endif
  57
  58 #ifdef FLOCK_LOCKING
  59                 case EWOULDBLOCK:
  60 #endif
  61                 case ETXTBSY:
  62                     j = errno;
  63                     sleep (5);
  64                     continue;
  65
  66                 default:
  67                     /* just return error */
  68                     return NOTOK;
  69             }
  70         }
  71
  72         /* good file descriptor */
  73         break;
  74     }
  75
  76     errno = j;
  77
  78     /*
  79      * Return if we still failed after 4 attempts,
  80      * or we just want to skip the sanity checks.
  81      */
  82     if (fd == NOTOK || mbx_style == OTHER_FORMAT)
  83         return fd;
  84
  85     /*
  86      * Do sanity checks on maildrop.
  87      */
  88     if (fstat (fd, &st) == NOTOK) {
  89         /*
  90          * The stat failed.  So we make sure file
  91          * has right ownership/modes
  92          */
  93         chown (file, uid, gid);
  94         chmod (file, mode);
  95     } else if (st.st_size > (off_t) 0) {
  96         int status;
  97
  98         /* check the maildrop */
  99         switch (mbx_style) {
 100             case MMDF_FORMAT:
 101             default:
 102                 status = mbx_chk_mmdf (fd);
 103                 break;
 104
 105             case MBOX_FORMAT:
 106                 status = mbx_chk_mbox (fd);
 107                 break;
 108         }
 109
 110         /* if error, attempt to close it */
 111         if (status == NOTOK) {
 112             close (fd);
 113             return NOTOK;
 114         }
 115     }
 116
 117     return fd;
 118 }
 119
 120
 121 /*
 122  * Check/prepare MBOX style maildrop for appending.
 123  */
 124
 125 static int
 126 mbx_chk_mbox (int fd)
 127 {
 128     /* just seek to the end */
 129     if (lseek (fd, (off_t) 0, SEEK_END) == (off_t) NOTOK)
 130         return NOTOK;
 131
 132     return OK;
 133 }
 134
 135
 136 /*
 137  * Check/prepare MMDF style maildrop for appending.
 138  */
 139
 140 static int
 141 mbx_chk_mmdf (int fd)
 142 {
 143     ssize_t count;
 144     char ldelim[BUFSIZ];
 145
 146     count = strlen (mmdlm2);
 147
 148     if (lseek (fd, -count, SEEK_END) == (off_t) NOTOK)
 149         return NOTOK;
 150     if (read (fd, ldelim, count) != count)
 151         return NOTOK;
 152
 153     ldelim[count] = 0;
 154
 155     if (strcmp (ldelim, mmdlm2)
 156             && write (fd, "\n", 1) != 1
 157             && write (fd, mmdlm2, count) != count)
 158         return NOTOK;
 159
 160     return OK;
 161 }
 162
 163
 164 int
 165 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
 166 {
 167     register int len, size;
 168     register long ld1, ld2;
 169     register char *bp;
 170     char buffer[BUFSIZ];
 171     register struct drop *cp, *dp, *ep, *pp;
 172
 173     pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
 174     if (pp == NULL) {
 175         if (noisy)
 176             admonish (NULL, "unable to allocate drop storage");
 177         return NOTOK;
 178     }
 179
 180     ld1 = (long) strlen (mmdlm1);
 181     ld2 = (long) strlen (mmdlm2);
 182
 183     fseek (fp, pos, SEEK_SET);
 184     for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
 185         size = 0;
 186         if (strcmp (buffer, mmdlm1) == 0)
 187             pos += ld1, dp->d_start = (long) pos;
 188         else {
 189             dp->d_start = (long)pos , pos += (long) strlen (buffer);
 190             for (bp = buffer; *bp; bp++, size++)
 191                 if (*bp == '\n')
 192                     size++;
 193         }
 194
 195         while (fgets (buffer, sizeof(buffer), fp) != NULL)
 196             if (strcmp (buffer, mmdlm2) == 0)
 197                 break;
 198             else {
 199                 pos += (long) strlen (buffer);
 200                 for (bp = buffer; *bp; bp++, size++)
 201                     if (*bp == '\n')
 202                         size++;
 203             }
 204
 205         if (dp->d_start != (long) pos) {
 206             dp->d_id = 0;
 207             dp->d_size = (long) size;
 208             dp->d_stop = pos;
 209             dp++;
 210         }
 211         pos += ld2;
 212
 213         if (dp >= ep) {
 214             register int    curlen = dp - pp;
 215
 216             cp = (struct drop *) mh_xrealloc ((char *) pp,
 217                                     (size_t) (len += MAXFOLDER) * sizeof(*pp));
 218             dp = cp + curlen, ep = (pp = cp) + len - 1;
 219         }
 220     }
 221
 222     if (dp == pp)
 223         free ((char *) pp);
 224     else
 225         *drops = pp;
 226     return (dp - pp);
 227 }
 228
 229
 230 int
 231 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
 232            long pos, off_t stop, int mapping, int noisy)
 233 {
 234     register int i, j, size;
 235     off_t start;
 236     long off;
 237     register char *cp;
 238     char buffer[BUFSIZ];
 239
 240     off = (long) lseek (md, (off_t) 0, SEEK_CUR);
 241     j = strlen (mmdlm1);
 242     if (write (md, mmdlm1, j) != j)
 243         return NOTOK;
 244     start = lseek (md, (off_t) 0, SEEK_CUR);
 245     size = 0;
 246
 247     fseek (fp, pos, SEEK_SET);
 248     while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
 249         i = strlen (buffer);
 250         for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 251             continue;
 252         for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
 253             continue;
 254         if (write (md, buffer, i) != i)
 255             return NOTOK;
 256         pos += (long) i;
 257         if (mapping)
 258             for (cp = buffer; i-- > 0; size++)
 259                 if (*cp++ == '\n')
 260                     size++;
 261     }
 262
 263     stop = lseek (md, (off_t) 0, SEEK_CUR);
 264     j = strlen (mmdlm2);
 265     if (write (md, mmdlm2, j) != j)
 266         return NOTOK;
 267     if (mapping)
 268         map_write (mailbox, md, id, last, start, stop, off, size, noisy);
 269
 270     return OK;
 271 }
 272
 273
 274 /*
 275  * Append message to end of file or maildrop.
 276  */
 277
 278 int
 279 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
 280           int mapping, char *text, int noisy)
 281 {
 282     int i, j, size;
 283     off_t start, stop;
 284     long pos;
 285     char *cp, buffer[BUFSIZ];
 286     FILE *fp;
 287
 288     pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
 289     size = 0;
 290
 291     switch (mbx_style) {
 292         case MMDF_FORMAT:
 293         default:
 294             j = strlen (mmdlm1);
 295             if (write (md, mmdlm1, j) != j)
 296                 return NOTOK;
 297             start = lseek (md, (off_t) 0, SEEK_CUR);
 298
 299             if (text) {
 300                 i = strlen (text);
 301                 if (write (md, text, i) != i)
 302                     return NOTOK;
 303                 for (cp = text; *cp++; size++)
 304                     if (*cp == '\n')
 305                         size++;
 306             }
 307
 308             while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
 309                 /* valgrind noticed that stringdex depends on null
 310                    termination. */
 311                 buffer[i] = '\0';
 312
 313                 for (j = 0;
 314                         (j = stringdex (mmdlm1, buffer)) >= 0;
 315                         buffer[j]++)
 316                     continue;
 317                 for (j = 0;
 318                         (j = stringdex (mmdlm2, buffer)) >= 0;
 319                         buffer[j]++)
 320                     continue;
 321                 if (write (md, buffer, i) != i)
 322                     return NOTOK;
 323                 if (mapping)
 324                     for (cp = buffer; i-- > 0; size++)
 325                         if (*cp++ == '\n')
 326                             size++;
 327             }
 328
 329             stop = lseek (md, (off_t) 0, SEEK_CUR);
 330             j = strlen (mmdlm2);
 331             if (write (md, mmdlm2, j) != j)
 332                 return NOTOK;
 333             if (mapping)
 334                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 335
 336             return (i != NOTOK ? OK : NOTOK);
 337
 338         case MBOX_FORMAT:
 339             if ((j = dup (fd)) == NOTOK)
 340                 return NOTOK;
 341             if ((fp = fdopen (j, "r")) == NULL) {
 342                 close (j);
 343                 return NOTOK;
 344             }
 345             start = lseek (md, (off_t) 0, SEEK_CUR);
 346
 347             /* If text is given, we add it to top of message */
 348             if (text) {
 349                 i = strlen (text);
 350                 if (write (md, text, i) != i)
 351                     return NOTOK;
 352                 for (cp = text; *cp++; size++)
 353                     if (*cp == '\n')
 354                         size++;
 355             }
 356
 357             for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
 358
 359                 /*
 360                  * Check the first line, and make some changes.
 361                  */
 362                 if (j == 0 && !text) {
 363                     /*
 364                      * Change the "Return-Path:" field (if in first line)
 365                      * back to "From ".
 366                      */
 367                     if (!strncmp (buffer, "Return-Path:", 12)) {
 368                         char tmpbuffer[BUFSIZ];
 369                         char *tp, *ep, *fp;
 370
 371                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 372                         ep = tmpbuffer + 13;
 373                         if (!(fp = strchr(ep + 1, ' ')))
 374                             fp = strchr(ep + 1, '\n');
 375                         tp = dctime(dlocaltimenow());
 376                         snprintf (buffer, sizeof(buffer), "From %.*s  %s",
 377                                 (int)(fp - ep), ep, tp);
 378                     } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
 379                         /*
 380                          * Change the "X-Envelope-From:" field
 381                          * (if first line) back to "From ".
 382                          */
 383                         char tmpbuffer[BUFSIZ];
 384                         char *ep;
 385
 386                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 387                         ep = tmpbuffer + 17;
 388                         snprintf (buffer, sizeof(buffer), "From %s", ep);
 389                     } else if (strncmp (buffer, "From ", 5)) {
 390                         /*
 391                          * If there is already a "From " line,
 392                          * then leave it alone.  Else we add one.
 393                          */
 394                         char tmpbuffer[BUFSIZ];
 395                         char *tp, *ep;
 396
 397                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 398                         ep = "nobody@nowhere";
 399                         tp = dctime(dlocaltimenow());
 400                         snprintf (buffer, sizeof(buffer), "From %s  %s%s", ep, tp, tmpbuffer);
 401                     }
 402                 }
 403
 404                 /*
 405                  * If this is not first line, and begins with
 406                  * "From ", then prepend line with ">".
 407                  */
 408                 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
 409                     write (md, ">", 1);
 410                     size++;
 411                 }
 412                 i = strlen (buffer);
 413                 if (write (md, buffer, i) != i) {
 414                     fclose (fp);
 415                     return NOTOK;
 416                 }
 417                 if (mapping)
 418                     for (cp = buffer; i-- > 0; size++)
 419                         if (*cp++ == '\n')
 420                             size++;
 421             }
 422             if (write (md, "\n", 1) != 1) {
 423                 fclose (fp);
 424                 return NOTOK;
 425             }
 426             if (mapping)
 427                 size += 2;
 428
 429             fclose (fp);
 430             lseek (fd, (off_t) 0, SEEK_END);
 431             stop = lseek (md, (off_t) 0, SEEK_CUR);
 432             if (mapping)
 433                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 434
 435             return OK;
 436     }
 437 }
 438
 439
 440 int
 441 mbx_size (int md, off_t start, off_t stop)
 442 {
 443     register int i, fd;
 444     register long pos;
 445     register FILE *fp;
 446
 447     if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
 448         if (fd != NOTOK)
 449             close (fd);
 450         return NOTOK;
 451     }
 452
 453     fseek (fp, start, SEEK_SET);
 454     for (i = 0, pos = stop - start; pos-- > 0; i++)
 455         if (fgetc (fp) == '\n')
 456             i++;
 457
 458     fclose (fp);
 459     return i;
 460 }
 461
 462
 463 /*
 464  * Close and unlock file/maildrop.
 465  */
 466
 467 int
 468 mbx_close (char *mailbox, int md)
 469 {
 470     if (lkclosespool (md, mailbox) == 0)
 471         return OK;
 472     return NOTOK;
 473 }
 474
 475
 476 /*
 477  * This function is performed implicitly by getbbent.c:
 478  *     bb->bb_map = map_name (bb->bb_file);
 479  */
 480
 481 char *
 482 map_name (char *file)
 483 {
 484     register char *cp, *dp;
 485     static char buffer[BUFSIZ];
 486
 487     if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
 488         dp = cp + strlen (cp);
 489     if (cp == file)
 490         snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
 491     else
 492         snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
 493                 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
 494
 495     return buffer;
 496 }
 497
 498
 499 int
 500 map_read (char *file, long pos, struct drop **drops, int noisy)
 501 {
 502     register int i, md, msgp;
 503     register char *cp;
 504     struct drop d;
 505     register struct drop *mp, *dp;
 506
 507     if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
 508             || map_chk (cp, md, mp = &d, pos, noisy)) {
 509         if (md != NOTOK)
 510             close (md);
 511         return 0;
 512     }
 513
 514     msgp = mp->d_id;
 515     dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
 516     if (dp == NULL) {
 517         close (md);
 518         return 0;
 519     }
 520
 521     memcpy((char *) dp, (char *) mp, sizeof(*dp));
 522
 523     lseek (md, (off_t) sizeof(*mp), SEEK_SET);
 524     if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) <
 525         (int) sizeof(*dp)) {
 526         i = 0;
 527         free ((char *) dp);
 528     } else {
 529 #ifdef NTOHLSWAP
 530         register struct drop *tdp;
 531         int j;
 532
 533         for (j = 0, tdp = dp; j < i / sizeof(*dp); j++, tdp++) {
 534             tdp->d_id = ntohl(tdp->d_id);
 535             tdp->d_size = ntohl(tdp->d_size);
 536             tdp->d_start = ntohl(tdp->d_start);
 537             tdp->d_stop = ntohl(tdp->d_stop);
 538         }
 539 #endif
 540         *drops = dp;
 541     }
 542
 543     close (md);
 544
 545     return (i / sizeof(*dp));
 546 }
 547
 548
 549 int
 550 map_write (char *mailbox, int md, int id, long last, off_t start,
 551            off_t stop, long pos, int size, int noisy)
 552 {
 553     register int i;
 554     int clear, fd, td;
 555     char *file;
 556     register struct drop *dp;
 557     struct drop d1, d2, *rp;
 558     register FILE *fp;
 559     struct stat st;
 560
 561     if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
 562         return NOTOK;
 563
 564     if ((fstat (fd, &st) == OK) && (st.st_size > 0))
 565         clear = 0;
 566     else
 567         clear = 1;
 568
 569     if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
 570         unlink (file);
 571         mbx_close (file, fd);
 572         if ((fd = map_open (file, md)) == NOTOK)
 573             return NOTOK;
 574         clear++;
 575     }
 576
 577     if (clear) {
 578         if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
 579             if (noisy)
 580                 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
 581             if (td != NOTOK)
 582                 close (td);
 583             mbx_close (file, fd);
 584             return NOTOK;
 585         }
 586
 587         switch (i = mbx_read (fp, 0, &rp, noisy)) {
 588             case NOTOK:
 589                 fclose (fp);
 590                 mbx_close (file, fd);
 591                 return NOTOK;
 592
 593             case OK:
 594                 fclose (fp);
 595                 break;
 596
 597             default:
 598                 d1.d_id = 0;
 599                 for (dp = rp; i-- >0; dp++) {
 600                     if (dp->d_start == start)
 601                         dp->d_id = id;
 602                     lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 603                     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 604                         if (noisy)
 605                             admonish (file, "write error");
 606                         mbx_close (file, fd);
 607                         fclose (fp);
 608                         return NOTOK;
 609                     }
 610                 }
 611                 free ((char *) rp);
 612                 fclose (fp);
 613                 break;
 614         }
 615     }
 616     else {
 617         if (last == 0)
 618             last = d1.d_start;
 619         dp = &d2;
 620         dp->d_id = id;
 621         dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
 622         dp->d_start = start;
 623         dp->d_stop = stop;
 624         lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 625         if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 626             if (noisy)
 627                 admonish (file, "write error");
 628             mbx_close (file, fd);
 629             return NOTOK;
 630         }
 631     }
 632
 633     dp = &d1;
 634     dp->d_size = DRVRSN;
 635     dp->d_start = (long) last;
 636     dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
 637
 638     lseek (fd, (off_t) 0, SEEK_SET);
 639     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 640         if (noisy)
 641             admonish (file, "write error");
 642         mbx_close (file, fd);
 643         return NOTOK;
 644     }
 645
 646     mbx_close (file, fd);
 647
 648     return OK;
 649 }
 650
 651
 652 static int
 653 map_open (char *file, int md)
 654 {
 655     mode_t mode;
 656     struct stat st;
 657
 658     mode = fstat (md, &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot ();
 659     return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
 660 }
 661
 662
 663 int
 664 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
 665 {
 666     ssize_t count;
 667     struct drop d, tmpd;
 668     register struct drop *dl;
 669
 670     if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
 671 #ifdef notdef
 672         admonish (NULL, "%s: missing or partial index", file);
 673 #endif /* notdef */
 674         return NOTOK;
 675     }
 676 #ifndef NTOHLSWAP
 677     *dp = tmpd;         /* if ntohl(n)=(n), can use struct assign */
 678 #else
 679     dp->d_id    = ntohl(tmpd.d_id);
 680     dp->d_size  = ntohl(tmpd.d_size);
 681     dp->d_start = ntohl(tmpd.d_start);
 682     dp->d_stop  = ntohl(tmpd.d_stop);
 683 #endif
 684
 685     if (dp->d_size != DRVRSN) {
 686         if (noisy)
 687             admonish (NULL, "%s: version mismatch (%d != %d)", file,
 688                                 dp->d_size, DRVRSN);
 689         return NOTOK;
 690     }
 691
 692     if (dp->d_stop != pos) {
 693         if (noisy && pos != (long) 0)
 694             admonish (NULL,
 695                     "%s: pointer mismatch or incomplete index (%ld!=%ld)",
 696                     file, dp->d_stop, (long) pos);
 697         return NOTOK;
 698     }
 699
 700     if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
 701         if (noisy)
 702             admonish (NULL, "%s: corrupt index(1)", file);
 703         return NOTOK;
 704     }
 705
 706     dl = &d;
 707     count = strlen (mmdlm2);
 708     lseek (fd, (off_t) (dp->d_id * sizeof(*dp)), SEEK_SET);
 709     if (read (fd, (char *) dl, sizeof(*dl)) != sizeof(*dl)
 710             || (ntohl(dl->d_stop) != dp->d_stop
 711                 && ntohl(dl->d_stop) + count != dp->d_stop)) {
 712         if (noisy)
 713             admonish (NULL, "%s: corrupt index(2)", file);
 714         return NOTOK;
 715     }
 716
 717     return OK;
 718 }