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