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 if (lseek (fd, -count, SEEK_END) == (off_t) NOTOK)
150 if (read (fd, ldelim, count) != count)
155 if (strcmp (ldelim, mmdlm2)
156 && write (fd, "\n", 1) != 1
157 && write (fd, mmdlm2, count) != count)
165 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
167 register int len, size;
168 register long ld1, ld2;
171 register struct drop *cp, *dp, *ep, *pp;
173 pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
176 admonish (NULL, "unable to allocate drop storage");
180 ld1 = (long) strlen (mmdlm1);
181 ld2 = (long) strlen (mmdlm2);
183 fseek (fp, pos, SEEK_SET);
184 for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
186 if (strcmp (buffer, mmdlm1) == 0)
187 pos += ld1, dp->d_start = (long) pos;
189 dp->d_start = (long)pos , pos += (long) strlen (buffer);
190 for (bp = buffer; *bp; bp++, size++)
195 while (fgets (buffer, sizeof(buffer), fp) != NULL)
196 if (strcmp (buffer, mmdlm2) == 0)
199 pos += (long) strlen (buffer);
200 for (bp = buffer; *bp; bp++, size++)
205 if (dp->d_start != (long) pos) {
207 dp->d_size = (long) size;
214 register int curlen = dp - pp;
216 cp = (struct drop *) mh_xrealloc ((char *) pp,
217 (size_t) (len += MAXFOLDER) * sizeof(*pp));
218 dp = cp + curlen, ep = (pp = cp) + len - 1;
231 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
232 long pos, off_t stop, int mapping, int noisy)
234 register int i, j, size;
240 off = (long) lseek (md, (off_t) 0, SEEK_CUR);
242 if (write (md, mmdlm1, j) != j)
244 start = lseek (md, (off_t) 0, SEEK_CUR);
247 fseek (fp, pos, SEEK_SET);
248 while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
250 for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
252 for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
254 if (write (md, buffer, i) != i)
258 for (cp = buffer; i-- > 0; size++)
263 stop = lseek (md, (off_t) 0, SEEK_CUR);
265 if (write (md, mmdlm2, j) != j)
268 map_write (mailbox, md, id, last, start, stop, off, size, noisy);
275 * Append message to end of file or maildrop.
279 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
280 int mapping, char *text, int noisy)
285 char *cp, buffer[BUFSIZ];
288 pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
295 if (write (md, mmdlm1, j) != j)
297 start = lseek (md, (off_t) 0, SEEK_CUR);
301 if (write (md, text, i) != i)
303 for (cp = text; *cp++; size++)
308 while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
310 (j = stringdex (mmdlm1, buffer)) >= 0;
314 (j = stringdex (mmdlm2, buffer)) >= 0;
317 if (write (md, buffer, i) != i)
320 for (cp = buffer; i-- > 0; size++)
325 stop = lseek (md, (off_t) 0, SEEK_CUR);
327 if (write (md, mmdlm2, j) != j)
330 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
332 return (i != NOTOK ? OK : NOTOK);
335 if ((j = dup (fd)) == NOTOK)
337 if ((fp = fdopen (j, "r")) == NULL) {
341 start = lseek (md, (off_t) 0, SEEK_CUR);
343 /* If text is given, we add it to top of message */
346 if (write (md, text, i) != i)
348 for (cp = text; *cp++; size++)
353 for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
356 * Check the first line, and make some changes.
358 if (j == 0 && !text) {
360 * Change the "Return-Path:" field (if in first line)
363 if (!strncmp (buffer, "Return-Path:", 12)) {
364 char tmpbuffer[BUFSIZ];
367 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
369 if (!(fp = strchr(ep + 1, ' ')))
370 fp = strchr(ep + 1, '\n');
371 tp = dctime(dlocaltimenow());
372 snprintf (buffer, sizeof(buffer), "From %.*s %s",
373 (int)(fp - ep), ep, tp);
374 } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
376 * Change the "X-Envelope-From:" field
377 * (if first line) back to "From ".
379 char tmpbuffer[BUFSIZ];
382 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
384 snprintf (buffer, sizeof(buffer), "From %s", ep);
385 } else if (strncmp (buffer, "From ", 5)) {
387 * If there is already a "From " line,
388 * then leave it alone. Else we add one.
390 char tmpbuffer[BUFSIZ];
393 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
394 ep = "nobody@nowhere";
395 tp = dctime(dlocaltimenow());
396 snprintf (buffer, sizeof(buffer), "From %s %s%s", ep, tp, tmpbuffer);
401 * If this is not first line, and begins with
402 * "From ", then prepend line with ">".
404 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
409 if (write (md, buffer, i) != i) {
414 for (cp = buffer; i-- > 0; size++)
418 if (write (md, "\n", 1) != 1) {
426 lseek (fd, (off_t) 0, SEEK_END);
427 stop = lseek (md, (off_t) 0, SEEK_CUR);
429 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
437 mbx_size (int md, off_t start, off_t stop)
443 if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
449 fseek (fp, start, SEEK_SET);
450 for (i = 0, pos = stop - start; pos-- > 0; i++)
451 if (fgetc (fp) == '\n')
460 * Close and unlock file/maildrop.
464 mbx_close (char *mailbox, int md)
466 if (lkclose (md, mailbox) == 0)
473 * This function is performed implicitly by getbbent.c:
474 * bb->bb_map = map_name (bb->bb_file);
478 map_name (char *file)
480 register char *cp, *dp;
481 static char buffer[BUFSIZ];
483 if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
484 dp = cp + strlen (cp);
486 snprintf (buffer, sizeof(buffer), ".%.*s%s", (int)(dp - cp), cp, ".map");
488 snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
489 (int)(cp - file), file, (int)(dp - cp), cp, ".map");
496 map_read (char *file, long pos, struct drop **drops, int noisy)
498 register int i, md, msgp;
501 register struct drop *mp, *dp;
503 if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
504 || map_chk (cp, md, mp = &d, pos, noisy)) {
511 dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
517 memcpy((char *) dp, (char *) mp, sizeof(*dp));
519 lseek (md, (off_t) sizeof(*mp), SEEK_SET);
520 if ((i = read (md, (char *) (dp + 1), msgp * 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 ? (int) (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 = 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);