3 * dropsbr.c -- create/read/manipulate mail drops
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.
14 #include <h/dropsbr.h>
20 # include <netinet/in.h>
31 static int mbx_chk_mbox (int);
32 static int mbx_chk_mmdf (int);
33 static int map_open (char *, int);
37 * Main entry point to open/create and lock
42 mbx_open (char *file, int mbx_style, uid_t uid, gid_t gid, mode_t mode)
49 /* attempt to open and lock file */
50 for (count = 4; count > 0; count--) {
51 if ((fd = lkopen (file, O_RDWR | O_CREAT | O_NONBLOCK, mode)) == NOTOK) {
53 #if defined(FCNTL_LOCKING) || defined(LOCKF_LOCKING)
67 /* just return error */
72 /* good file descriptor */
79 * Return if we still failed after 4 attempts,
80 * or we just want to skip the sanity checks.
82 if (fd == NOTOK || mbx_style == OTHER_FORMAT)
86 * Do sanity checks on maildrop.
88 if (fstat (fd, &st) == NOTOK) {
90 * The stat failed. So we make sure file
91 * has right ownership/modes
93 chown (file, uid, gid);
95 } else if (st.st_size > (off_t) 0) {
98 /* check the maildrop */
102 status = mbx_chk_mmdf (fd);
106 status = mbx_chk_mbox (fd);
110 /* if error, attempt to close it */
111 if (status == NOTOK) {
122 * Check/prepare MBOX style maildrop for appending.
126 mbx_chk_mbox (int fd)
128 /* just seek to the end */
129 if (lseek (fd, (off_t) 0, SEEK_END) == (off_t) NOTOK)
137 * Check/prepare MMDF style maildrop for appending.
141 mbx_chk_mmdf (int fd)
146 count = strlen (mmdlm2);
148 /* casting -count to off_t, seem to break FreeBSD 2.2.6 */
149 if (lseek (fd, (long) (-count), SEEK_END) == (off_t) NOTOK)
151 if (read (fd, ldelim, count) != count)
156 if (strcmp (ldelim, mmdlm2)
157 && write (fd, "\n", 1) != 1
158 && write (fd, mmdlm2, count) != count)
166 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
168 register int len, size;
169 register long ld1, ld2;
172 register struct drop *cp, *dp, *ep, *pp;
174 pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
177 admonish (NULL, "unable to allocate drop storage");
181 ld1 = (long) strlen (mmdlm1);
182 ld2 = (long) strlen (mmdlm2);
184 fseek (fp, pos, SEEK_SET);
185 for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
187 if (strcmp (buffer, mmdlm1) == 0)
188 pos += ld1, dp->d_start = (long) pos;
190 dp->d_start = (long)pos , pos += (long) strlen (buffer);
191 for (bp = buffer; *bp; bp++, size++)
196 while (fgets (buffer, sizeof(buffer), fp) != NULL)
197 if (strcmp (buffer, mmdlm2) == 0)
200 pos += (long) strlen (buffer);
201 for (bp = buffer; *bp; bp++, size++)
206 if (dp->d_start != (long) pos) {
208 dp->d_size = (long) size;
215 register int curlen = dp - pp;
217 cp = (struct drop *) mh_xrealloc ((char *) pp,
218 (size_t) (len += MAXFOLDER) * sizeof(*pp));
219 dp = cp + curlen, ep = (pp = cp) + len - 1;
232 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
233 long pos, off_t stop, int mapping, int noisy)
235 register int i, j, size;
241 off = (long) lseek (md, (off_t) 0, SEEK_CUR);
243 if (write (md, mmdlm1, j) != j)
245 start = lseek (md, (off_t) 0, SEEK_CUR);
248 fseek (fp, pos, SEEK_SET);
249 while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
251 for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
253 for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
255 if (write (md, buffer, i) != i)
259 for (cp = buffer; i-- > 0; size++)
264 stop = lseek (md, (off_t) 0, SEEK_CUR);
266 if (write (md, mmdlm2, j) != j)
269 map_write (mailbox, md, id, last, start, stop, off, size, noisy);
276 * Append message to end of file or maildrop.
280 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
281 int mapping, char *text, int noisy)
286 char *cp, buffer[BUFSIZ];
289 pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
296 if (write (md, mmdlm1, j) != j)
298 start = lseek (md, (off_t) 0, SEEK_CUR);
302 if (write (md, text, i) != i)
304 for (cp = text; *cp++; size++)
309 while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
311 (j = stringdex (mmdlm1, buffer)) >= 0;
315 (j = stringdex (mmdlm2, buffer)) >= 0;
318 if (write (md, buffer, i) != i)
321 for (cp = buffer; i-- > 0; size++)
326 stop = lseek (md, (off_t) 0, SEEK_CUR);
328 if (write (md, mmdlm2, j) != j)
331 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
333 return (i != NOTOK ? OK : NOTOK);
336 if ((j = dup (fd)) == NOTOK)
338 if ((fp = fdopen (j, "r")) == NULL) {
342 start = lseek (md, (off_t) 0, SEEK_CUR);
344 /* If text is given, we add it to top of message */
347 if (write (md, text, i) != i)
349 for (cp = text; *cp++; size++)
354 for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
357 * Check the first line, and make some changes.
359 if (j == 0 && !text) {
361 * Change the "Return-Path:" field (if in first line)
364 if (!strncmp (buffer, "Return-Path:", 12)) {
365 char tmpbuffer[BUFSIZ];
368 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
370 if (!(fp = strchr(ep + 1, ' ')))
371 fp = strchr(ep + 1, '\n');
372 tp = dctime(dlocaltimenow());
373 snprintf (buffer, sizeof(buffer), "From %.*s %s",
374 (int)(fp - ep), ep, tp);
375 } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
377 * Change the "X-Envelope-From:" field
378 * (if first line) back to "From ".
380 char tmpbuffer[BUFSIZ];
383 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
385 snprintf (buffer, sizeof(buffer), "From %s", ep);
386 } else if (strncmp (buffer, "From ", 5)) {
388 * If there is already a "From " line,
389 * then leave it alone. Else we add one.
391 char tmpbuffer[BUFSIZ];
394 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
395 ep = "nobody@nowhere";
396 tp = dctime(dlocaltimenow());
397 snprintf (buffer, sizeof(buffer), "From %s %s%s", ep, tp, tmpbuffer);
402 * If this is not first line, and begins with
403 * "From ", then prepend line with ">".
405 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
410 if (write (md, buffer, i) != i) {
415 for (cp = buffer; i-- > 0; size++)
419 if (write (md, "\n", 1) != 1) {
427 lseek (fd, (off_t) 0, SEEK_END);
428 stop = lseek (md, (off_t) 0, SEEK_CUR);
430 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
438 mbx_size (int md, off_t start, off_t stop)
444 if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
450 fseek (fp, start, SEEK_SET);
451 for (i = 0, pos = stop - start; pos-- > 0; i++)
452 if (fgetc (fp) == '\n')
461 * Close and unlock file/maildrop.
465 mbx_close (char *mailbox, int md)
467 if (lkclose (md, mailbox) == 0)
474 * This function is performed implicitly by getbbent.c:
475 * bb->bb_map = map_name (bb->bb_file);
479 map_name (char *file)
481 register char *cp, *dp;
482 static char buffer[BUFSIZ];
484 if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
485 dp = cp + strlen (cp);
487 snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
489 snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
490 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
497 map_read (char *file, long pos, struct drop **drops, int noisy)
499 register int i, md, msgp;
502 register struct drop *mp, *dp;
504 if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
505 || map_chk (cp, md, mp = &d, pos, noisy)) {
512 dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
518 memcpy((char *) dp, (char *) mp, sizeof(*dp));
520 lseek (md, (off_t) sizeof(*mp), SEEK_SET);
521 if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) < sizeof(*dp)) {
526 register struct drop *tdp;
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);
541 return (i / sizeof(*dp));
546 map_write (char *mailbox, int md, int id, long last, off_t start,
547 off_t stop, long pos, int size, int noisy)
552 register struct drop *dp;
553 struct drop d1, d2, *rp;
557 if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
560 if ((fstat (fd, &st) == OK) && (st.st_size > 0))
565 if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
567 mbx_close (file, fd);
568 if ((fd = map_open (file, md)) == NOTOK)
574 if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
576 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
579 mbx_close (file, fd);
583 switch (i = mbx_read (fp, 0, &rp, noisy)) {
586 mbx_close (file, fd);
595 for (dp = rp; i-- >0; dp++) {
596 if (dp->d_start == start)
598 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
599 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
601 admonish (file, "write error");
602 mbx_close (file, fd);
617 dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
620 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
621 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
623 admonish (file, "write error");
624 mbx_close (file, fd);
631 dp->d_start = (long) last;
632 dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
634 lseek (fd, (off_t) 0, SEEK_SET);
635 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
637 admonish (file, "write error");
638 mbx_close (file, fd);
642 mbx_close (file, fd);
649 map_open (char *file, int md)
654 mode = fstat (md, &st) != NOTOK ? (mode_t) (st.st_mode & 0777) : m_gmprot ();
655 return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
660 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
664 register struct drop *dl;
666 if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
668 admonish (NULL, "%s: missing or partial index", file);
673 *dp = tmpd; /* if ntohl(n)=(n), can use struct assign */
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);
681 if (dp->d_size != DRVRSN) {
683 admonish (NULL, "%s: version mismatch (%d != %d)", file,
688 if (dp->d_stop != pos) {
689 if (noisy && pos != (long) 0)
691 "%s: pointer mismatch or incomplete index (%ld!=%ld)",
692 file, dp->d_stop, (long) pos);
696 if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
698 admonish (NULL, "%s: corrupt index(1)", file);
703 count = (long) 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)) {
709 admonish (NULL, "%s: corrupt index(2)", file);