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)
 160 {
 161     int len, size;
 162     long ld1, ld2;
 163     char *bp;
 164     char buffer[BUFSIZ];
 165     struct drop *cp, *dp, *ep, *pp;
 166
 167     len = MAXFOLDER;
 168     pp = mh_xcalloc(len, sizeof *pp);
 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             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(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     int i, j, size;
 225     off_t start;
 226     long off;
 227     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 = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 241             continue;
 242         for ( ; (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 = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 304                     continue;
 305                 for ( ; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
 306                     continue;
 307                 if (write (md, buffer, i) != i)
 308                     return NOTOK;
 309                 if (mapping)
 310                     for (cp = buffer; i-- > 0; size++)
 311                         if (*cp++ == '\n')
 312                             size++;
 313             }
 314
 315             stop = lseek (md, (off_t) 0, SEEK_CUR);
 316             j = strlen (mmdlm2);
 317             if (write (md, mmdlm2, j) != j)
 318                 return NOTOK;
 319             if (mapping)
 320                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 321
 322             return (i != NOTOK ? OK : NOTOK);
 323
 324         case MBOX_FORMAT:
 325             if ((j = dup (fd)) == NOTOK)
 326                 return NOTOK;
 327             if ((fp = fdopen (j, "r")) == NULL) {
 328                 close (j);
 329                 return NOTOK;
 330             }
 331             start = lseek (md, (off_t) 0, SEEK_CUR);
 332
 333             /* If text is given, we add it to top of message */
 334             if (text) {
 335                 i = strlen (text);
 336                 if (write (md, text, i) != i)
 337                     return NOTOK;
 338                 for (cp = text; *cp++; size++)
 339                     if (*cp == '\n')
 340                         size++;
 341             }
 342
 343             for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
 344
 345                 /*
 346                  * Check the first line, and make some changes.
 347                  */
 348                 if (j == 0 && !text) {
 349                     /*
 350                      * Change the "Return-Path:" field (if in first line)
 351                      * back to "From ".
 352                      */
 353                     if (HasPrefix(buffer, "Return-Path:")) {
 354                         char tmpbuffer[BUFSIZ];
 355                         char *tp, *ep, *fp;
 356
 357                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 358                         ep = tmpbuffer + 13;
 359                         if (!(fp = strchr(ep + 1, ' ')))
 360                             fp = strchr(ep + 1, '\n');
 361                         tp = dctime(dlocaltimenow());
 362                         snprintf (buffer, sizeof(buffer), "From %.*s  %s",
 363                                 (int)(fp - ep), ep, tp);
 364                     } else if (HasPrefix(buffer, "X-Envelope-From:")) {
 365                         /*
 366                          * Change the "X-Envelope-From:" field
 367                          * (if first line) back to "From ".
 368                          */
 369                         char tmpbuffer[BUFSIZ];
 370                         char *ep;
 371
 372                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 373                         ep = tmpbuffer + 17;
 374                         snprintf (buffer, sizeof(buffer), "From %s", ep);
 375                     } else if (!HasPrefix(buffer, "From ")) {
 376                         /*
 377                          * If there is already a "From " line,
 378                          * then leave it alone.  Else we add one.
 379                          */
 380                         char tmpbuffer[BUFSIZ];
 381                         char *tp, *ep;
 382
 383                         strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
 384                         ep = "nobody@nowhere";
 385                         tp = dctime(dlocaltimenow());
 386                         snprintf (buffer, sizeof(buffer), "From %s  %s%s", ep, tp, tmpbuffer);
 387                     }
 388                 }
 389
 390                 /*
 391                  * If this is not first line, and begins with
 392                  * "From ", then prepend line with ">".
 393                  */
 394                 if (j != 0 && HasPrefix(buffer, "From ")) {
 395                     if (write (md, ">", 1) < 0) {
 396                         advise (mailbox, "write");
 397                     }
 398                     size++;
 399                 }
 400                 i = strlen (buffer);
 401                 if (write (md, buffer, i) != i) {
 402                     fclose (fp);
 403                     return NOTOK;
 404                 }
 405                 if (mapping)
 406                     for (cp = buffer; i-- > 0; size++)
 407                         if (*cp++ == '\n')
 408                             size++;
 409             }
 410             if (write (md, "\n", 1) != 1) {
 411                 fclose (fp);
 412                 return NOTOK;
 413             }
 414             if (mapping)
 415                 size += 2;
 416
 417             fclose (fp);
 418             lseek (fd, (off_t) 0, SEEK_END);
 419             stop = lseek (md, (off_t) 0, SEEK_CUR);
 420             if (mapping)
 421                 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
 422
 423             return OK;
 424     }
 425 }
 426
 427
 428 int
 429 mbx_size (int md, off_t start, off_t stop)
 430 {
 431     int i, fd;
 432     long pos;
 433     FILE *fp;
 434
 435     if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
 436         if (fd != NOTOK)
 437             close (fd);
 438         return NOTOK;
 439     }
 440
 441     fseek (fp, start, SEEK_SET);
 442     for (i = 0, pos = stop - start; pos-- > 0; i++)
 443         if (fgetc (fp) == '\n')
 444             i++;
 445
 446     fclose (fp);
 447     return i;
 448 }
 449
 450
 451 /*
 452  * Close and unlock file/maildrop.
 453  */
 454
 455 int
 456 mbx_close (char *mailbox, int md)
 457 {
 458     if (lkclosespool (md, mailbox) == 0)
 459         return OK;
 460     return NOTOK;
 461 }
 462
 463
 464 /*
 465  * This function is performed implicitly by getbbent.c:
 466  *     bb->bb_map = map_name (bb->bb_file);
 467  */
 468
 469 char *
 470 map_name (char *file)
 471 {
 472     char *cp, *dp;
 473     static char buffer[BUFSIZ];
 474
 475     if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
 476         dp = cp + strlen (cp);
 477     if (cp == file)
 478         snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
 479     else
 480         snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
 481                 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
 482
 483     return buffer;
 484 }
 485
 486
 487 int
 488 map_read (char *file, long pos, struct drop **drops, int noisy)
 489 {
 490     int i, md, msgp;
 491     char *cp;
 492     struct drop d;
 493     struct drop *mp, *dp;
 494
 495     if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
 496             || map_chk (cp, md, mp = &d, pos, noisy)) {
 497         if (md != NOTOK)
 498             close (md);
 499         return 0;
 500     }
 501
 502     msgp = mp->d_id;
 503     dp = mh_xcalloc(msgp + 1, sizeof *dp);
 504     memcpy((char *) dp, (char *) mp, sizeof(*dp));
 505
 506     lseek (md, (off_t) sizeof(*mp), SEEK_SET);
 507     if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) <
 508         (int) sizeof(*dp)) {
 509         i = 0;
 510         free(dp);
 511     } else {
 512 #ifdef NTOHLSWAP
 513         struct drop *tdp;
 514         int j;
 515
 516         for (j = 0, tdp = dp; j < i / sizeof(*dp); j++, tdp++) {
 517             tdp->d_id = ntohl(tdp->d_id);
 518             tdp->d_size = ntohl(tdp->d_size);
 519             tdp->d_start = ntohl(tdp->d_start);
 520             tdp->d_stop = ntohl(tdp->d_stop);
 521         }
 522 #endif
 523         *drops = dp;
 524     }
 525
 526     close (md);
 527
 528     return (i / sizeof(*dp));
 529 }
 530
 531
 532 int
 533 map_write (char *mailbox, int md, int id, long last, off_t start,
 534            off_t stop, long pos, int size, int noisy)
 535 {
 536     int i;
 537     int clear, fd, td;
 538     char *file;
 539     struct drop *dp;
 540     struct drop d1, d2, *rp;
 541     FILE *fp;
 542     struct stat st;
 543
 544     if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
 545         return NOTOK;
 546
 547     if ((fstat (fd, &st) == OK) && (st.st_size > 0))
 548         clear = 0;
 549     else
 550         clear = 1;
 551
 552     if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
 553         (void) m_unlink (file);
 554         mbx_close (file, fd);
 555         if ((fd = map_open (file, md)) == NOTOK)
 556             return NOTOK;
 557         clear++;
 558     }
 559
 560     if (clear) {
 561         if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
 562             if (noisy)
 563                 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
 564             if (td != NOTOK)
 565                 close (td);
 566             mbx_close (file, fd);
 567             return NOTOK;
 568         }
 569
 570         switch (i = mbx_read (fp, 0, &rp)) {
 571             case NOTOK:
 572                 fclose (fp);
 573                 mbx_close (file, fd);
 574                 return NOTOK;
 575
 576             case OK:
 577                 fclose (fp);
 578                 break;
 579
 580             default:
 581                 d1.d_id = 0;
 582                 for (dp = rp; i-- >0; dp++) {
 583                     if (dp->d_start == start)
 584                         dp->d_id = id;
 585                     lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 586                     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 587                         if (noisy)
 588                             admonish (file, "write error");
 589                         mbx_close (file, fd);
 590                         fclose (fp);
 591                         return NOTOK;
 592                     }
 593                 }
 594                 free(rp);
 595                 fclose (fp);
 596                 break;
 597         }
 598     }
 599     else {
 600         if (last == 0)
 601             last = d1.d_start;
 602         dp = &d2;
 603         dp->d_id = id;
 604         dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
 605         dp->d_start = start;
 606         dp->d_stop = stop;
 607         lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
 608         if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 609             if (noisy)
 610                 admonish (file, "write error");
 611             mbx_close (file, fd);
 612             return NOTOK;
 613         }
 614     }
 615
 616     dp = &d1;
 617     dp->d_size = DRVRSN;
 618     dp->d_start = (long) last;
 619     dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
 620
 621     lseek (fd, (off_t) 0, SEEK_SET);
 622     if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
 623         if (noisy)
 624             admonish (file, "write error");
 625         mbx_close (file, fd);
 626         return NOTOK;
 627     }
 628
 629     mbx_close (file, fd);
 630
 631     return OK;
 632 }
 633
 634
 635 static int
 636 map_open (char *file, int md)
 637 {
 638     mode_t mode;
 639     struct stat st;
 640
 641     mode = fstat (md, &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot ();
 642     return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
 643 }
 644
 645
 646 int
 647 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
 648 {
 649     ssize_t count;
 650     struct drop d, tmpd;
 651     struct drop *dl;
 652
 653     if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
 654 #ifdef notdef
 655         admonish (NULL, "%s: missing or partial index", file);
 656 #endif /* notdef */
 657         return NOTOK;
 658     }
 659 #ifndef NTOHLSWAP
 660     *dp = tmpd;         /* if ntohl(n)=(n), can use struct assign */
 661 #else
 662     dp->d_id    = ntohl(tmpd.d_id);
 663     dp->d_size  = ntohl(tmpd.d_size);
 664     dp->d_start = ntohl(tmpd.d_start);
 665     dp->d_stop  = ntohl(tmpd.d_stop);
 666 #endif
 667
 668     if (dp->d_size != DRVRSN) {
 669         if (noisy)
 670             admonish (NULL, "%s: version mismatch (%d != %d)", file,
 671                                 dp->d_size, DRVRSN);
 672         return NOTOK;
 673     }
 674
 675     if (dp->d_stop != pos) {
 676         if (noisy && pos != (long) 0)
 677             admonish (NULL,
 678                     "%s: pointer mismatch or incomplete index (%ld!=%ld)",
 679                     file, dp->d_stop, (long) pos);
 680         return NOTOK;
 681     }
 682
 683     if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
 684         if (noisy)
 685             admonish (NULL, "%s: corrupt index(1)", file);
 686         return NOTOK;
 687     }
 688
 689     dl = &d;
 690     count = strlen (mmdlm2);
 691     lseek (fd, (off_t) (dp->d_id * sizeof(*dp)), SEEK_SET);
 692     if (read (fd, (char *) dl, sizeof(*dl)) != sizeof(*dl)
 693             || (ntohl(dl->d_stop) != dp->d_stop
 694                 && ntohl(dl->d_stop) + count != dp->d_stop)) {
 695         if (noisy)
 696             admonish (NULL, "%s: corrupt index(2)", file);
 697         return NOTOK;
 698     }
 699
 700     return OK;
 701 }