3 * dropsbr.c -- create/read/manipulate mail drops
7 * This code is Copyright (c) 2002, by the authors of nmh. See the
8 * COPYRIGHT file in the root directory of the nmh distribution for
9 * complete copyright information.
16 #include <h/dropsbr.h>
25 # include <netinet/in.h>
36 static int mbx_chk_mbox (int);
37 static int mbx_chk_mmdf (int);
38 static int map_open (char *, int);
42 * Main entry point to open/create and lock
47 mbx_open (char *file, int mbx_style, uid_t uid, gid_t gid, mode_t mode)
54 /* attempt to open and lock file */
55 for (count = 4; count > 0; count--) {
56 if ((fd = lkopen (file, O_RDWR | O_CREAT | O_NONBLOCK, mode)) == NOTOK) {
58 #if defined(FCNTL_LOCKING) || defined(LOCKF_LOCKING)
72 /* just return error */
77 /* good file descriptor */
84 * Return if we still failed after 4 attempts,
85 * or we just want to skip the sanity checks.
87 if (fd == NOTOK || mbx_style == OTHER_FORMAT)
91 * Do sanity checks on maildrop.
93 if (fstat (fd, &st) == NOTOK) {
95 * The stat failed. So we make sure file
96 * has right ownership/modes
98 chown (file, uid, gid);
100 } else if (st.st_size > (off_t) 0) {
103 /* check the maildrop */
107 status = mbx_chk_mmdf (fd);
111 status = mbx_chk_mbox (fd);
115 /* if error, attempt to close it */
116 if (status == NOTOK) {
127 * Check/prepare MBOX style maildrop for appending.
131 mbx_chk_mbox (int fd)
133 /* just seek to the end */
134 if (lseek (fd, (off_t) 0, SEEK_END) == (off_t) NOTOK)
142 * Check/prepare MMDF style maildrop for appending.
146 mbx_chk_mmdf (int fd)
151 count = strlen (mmdlm2);
153 /* casting -count to off_t, seem to break FreeBSD 2.2.6 */
154 if (lseek (fd, (long) (-count), SEEK_END) == (off_t) NOTOK)
156 if (read (fd, ldelim, count) != count)
161 if (strcmp (ldelim, mmdlm2)
162 && write (fd, "\n", 1) != 1
163 && write (fd, mmdlm2, count) != count)
171 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
173 register int len, size;
174 register long ld1, ld2;
177 register struct drop *cp, *dp, *ep, *pp;
179 pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
182 admonish (NULL, "unable to allocate drop storage");
186 ld1 = (long) strlen (mmdlm1);
187 ld2 = (long) strlen (mmdlm2);
189 fseek (fp, pos, SEEK_SET);
190 for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
192 if (strcmp (buffer, mmdlm1) == 0)
193 pos += ld1, dp->d_start = (long) pos;
195 dp->d_start = (long)pos , pos += (long) strlen (buffer);
196 for (bp = buffer; *bp; bp++, size++)
201 while (fgets (buffer, sizeof(buffer), fp) != NULL)
202 if (strcmp (buffer, mmdlm2) == 0)
205 pos += (long) strlen (buffer);
206 for (bp = buffer; *bp; bp++, size++)
211 if (dp->d_start != (long) pos) {
213 dp->d_size = (long) size;
220 register int curlen = dp - pp;
222 cp = (struct drop *) mh_xrealloc ((char *) pp,
223 (size_t) (len += MAXFOLDER) * sizeof(*pp));
224 dp = cp + curlen, ep = (pp = cp) + len - 1;
237 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
238 long pos, off_t stop, int mapping, int noisy)
240 register int i, j, size;
246 off = (long) lseek (md, (off_t) 0, SEEK_CUR);
248 if (write (md, mmdlm1, j) != j)
250 start = lseek (md, (off_t) 0, SEEK_CUR);
253 fseek (fp, pos, SEEK_SET);
254 while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
256 for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
258 for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
260 if (write (md, buffer, i) != i)
264 for (cp = buffer; i-- > 0; size++)
269 stop = lseek (md, (off_t) 0, SEEK_CUR);
271 if (write (md, mmdlm2, j) != j)
274 map_write (mailbox, md, id, last, start, stop, off, size, noisy);
281 * Append message to end of file or maildrop.
285 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
286 int mapping, char *text, int noisy)
291 char *cp, buffer[BUFSIZ];
294 pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
301 if (write (md, mmdlm1, j) != j)
303 start = lseek (md, (off_t) 0, SEEK_CUR);
307 if (write (md, text, i) != i)
309 for (cp = text; *cp++; size++)
314 while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
316 (j = stringdex (mmdlm1, buffer)) >= 0;
320 (j = stringdex (mmdlm2, buffer)) >= 0;
323 if (write (md, buffer, i) != i)
326 for (cp = buffer; i-- > 0; size++)
331 stop = lseek (md, (off_t) 0, SEEK_CUR);
333 if (write (md, mmdlm2, j) != j)
336 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
338 return (i != NOTOK ? OK : NOTOK);
341 if ((j = dup (fd)) == NOTOK)
343 if ((fp = fdopen (j, "r")) == NULL) {
347 start = lseek (md, (off_t) 0, SEEK_CUR);
349 /* If text is given, we add it to top of message */
352 if (write (md, text, i) != i)
354 for (cp = text; *cp++; size++)
359 for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
362 * Check the first line, and make some changes.
364 if (j == 0 && !text) {
366 * Change the "Return-Path:" field (if in first line)
369 if (!strncmp (buffer, "Return-Path:", 12)) {
370 char tmpbuffer[BUFSIZ];
373 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
375 if (!(fp = strchr(ep + 1, ' ')))
376 fp = strchr(ep + 1, '\n');
377 tp = dctime(dlocaltimenow());
378 snprintf (buffer, sizeof(buffer), "From %.*s %s",
379 (int)(fp - ep), ep, tp);
380 } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
382 * Change the "X-Envelope-From:" field
383 * (if first line) back to "From ".
385 char tmpbuffer[BUFSIZ];
388 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
390 snprintf (buffer, sizeof(buffer), "From %s", ep);
391 } else if (strncmp (buffer, "From ", 5)) {
393 * If there is already a "From " line,
394 * then leave it alone. Else we add one.
396 char tmpbuffer[BUFSIZ];
399 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
400 ep = "nobody@nowhere";
401 tp = dctime(dlocaltimenow());
402 snprintf (buffer, sizeof(buffer), "From %s %s%s", ep, tp, tmpbuffer);
407 * If this is not first line, and begins with
408 * "From ", then prepend line with ">".
410 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
415 if (write (md, buffer, i) != i) {
420 for (cp = buffer; i-- > 0; size++)
424 if (write (md, "\n", 1) != 1) {
432 lseek (fd, (off_t) 0, SEEK_END);
433 stop = lseek (md, (off_t) 0, SEEK_CUR);
435 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
443 mbx_size (int md, off_t start, off_t stop)
449 if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
455 fseek (fp, start, SEEK_SET);
456 for (i = 0, pos = stop - start; pos-- > 0; i++)
457 if (fgetc (fp) == '\n')
466 * Close and unlock file/maildrop.
470 mbx_close (char *mailbox, int md)
472 lkclose (md, mailbox);
478 * This function is performed implicitly by getbbent.c:
479 * bb->bb_map = map_name (bb->bb_file);
483 map_name (char *file)
485 register char *cp, *dp;
486 static char buffer[BUFSIZ];
488 if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
489 dp = cp + strlen (cp);
491 snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
493 snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
494 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
501 map_read (char *file, long pos, struct drop **drops, int noisy)
503 register int i, md, msgp;
506 register struct drop *mp, *dp;
508 if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
509 || map_chk (cp, md, mp = &d, pos, noisy)) {
516 dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
522 memcpy((char *) dp, (char *) mp, sizeof(*dp));
524 lseek (md, (off_t) sizeof(*mp), SEEK_SET);
525 if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) < sizeof(*dp)) {
530 register struct drop *tdp;
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);
545 return (i / sizeof(*dp));
550 map_write (char *mailbox, int md, int id, long last, off_t start,
551 off_t stop, long pos, int size, int noisy)
556 register struct drop *dp;
557 struct drop d1, d2, *rp;
561 if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
564 if ((fstat (fd, &st) == OK) && (st.st_size > 0))
569 if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
571 mbx_close (file, fd);
572 if ((fd = map_open (file, md)) == NOTOK)
578 if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
580 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
583 mbx_close (file, fd);
587 switch (i = mbx_read (fp, 0, &rp, noisy)) {
590 mbx_close (file, fd);
599 for (dp = rp; i-- >0; dp++) {
600 if (dp->d_start == start)
602 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
603 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
605 admonish (file, "write error");
606 mbx_close (file, fd);
621 dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
624 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
625 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
627 admonish (file, "write error");
628 mbx_close (file, fd);
635 dp->d_start = (long) last;
636 dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
638 lseek (fd, (off_t) 0, SEEK_SET);
639 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
641 admonish (file, "write error");
642 mbx_close (file, fd);
646 mbx_close (file, fd);
653 map_open (char *file, int md)
658 mode = fstat (md, &st) != NOTOK ? (mode_t) (st.st_mode & 0777) : m_gmprot ();
659 return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
664 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
668 register struct drop *dl;
670 if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
672 admonish (NULL, "%s: missing or partial index", file);
677 *dp = tmpd; /* if ntohl(n)=(n), can use struct assign */
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);
685 if (dp->d_size != DRVRSN) {
687 admonish (NULL, "%s: version mismatch (%d != %d)", file,
692 if (dp->d_stop != pos) {
693 if (noisy && pos != (long) 0)
695 "%s: pointer mismatch or incomplete index (%ld!=%ld)",
696 file, dp->d_stop, (long) pos);
700 if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
702 admonish (NULL, "%s: corrupt index(1)", file);
707 count = (long) 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)) {
713 admonish (NULL, "%s: corrupt index(2)", file);