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>
22 # include "mmdfonly.h"
30 # include <netinet/in.h>
43 static int mbx_chk_mbox (int);
44 static int mbx_chk_mmdf (int);
45 static int map_open (char *, int);
49 * Main entry point to open/create and lock
54 mbx_open (char *file, int mbx_style, uid_t uid, gid_t gid, mode_t mode)
61 /* attempt to open and lock file */
62 for (count = 4; count > 0; count--) {
63 if ((fd = lkopen (file, O_RDWR | O_CREAT | O_NONBLOCK, mode)) == NOTOK) {
65 #if defined(FCNTL_LOCKING) || defined(LOCKF_LOCKING)
79 /* just return error */
84 /* good file descriptor */
91 * Return if we still failed after 4 attempts,
92 * or we just want to skip the sanity checks.
94 if (fd == NOTOK || mbx_style == OTHER_FORMAT)
98 * Do sanity checks on maildrop.
100 if (fstat (fd, &st) == NOTOK) {
102 * The stat failed. So we make sure file
103 * has right ownership/modes
105 chown (file, uid, gid);
107 } else if (st.st_size > (off_t) 0) {
110 /* check the maildrop */
114 status = mbx_chk_mmdf (fd);
118 status = mbx_chk_mbox (fd);
122 /* if error, attempt to close it */
123 if (status == NOTOK) {
134 * Check/prepare MBOX style maildrop for appending.
138 mbx_chk_mbox (int fd)
140 /* just seek to the end */
141 if (lseek (fd, (off_t) 0, SEEK_END) == (off_t) NOTOK)
149 * Check/prepare MMDF style maildrop for appending.
153 mbx_chk_mmdf (int fd)
158 count = strlen (mmdlm2);
160 /* casting -count to off_t, seem to break FreeBSD 2.2.6 */
161 if (lseek (fd, (long) (-count), SEEK_END) == (off_t) NOTOK)
163 if (read (fd, ldelim, count) != count)
168 if (strcmp (ldelim, mmdlm2)
169 && write (fd, "\n", 1) != 1
170 && write (fd, mmdlm2, count) != count)
178 mbx_read (FILE *fp, long pos, struct drop **drops, int noisy)
180 register int len, size;
181 register long ld1, ld2;
184 register struct drop *cp, *dp, *ep, *pp;
186 pp = (struct drop *) calloc ((size_t) (len = MAXFOLDER), sizeof(*dp));
189 admonish (NULL, "unable to allocate drop storage");
193 ld1 = (long) strlen (mmdlm1);
194 ld2 = (long) strlen (mmdlm2);
196 fseek (fp, pos, SEEK_SET);
197 for (ep = (dp = pp) + len - 1; fgets (buffer, sizeof(buffer), fp);) {
199 if (strcmp (buffer, mmdlm1) == 0)
200 pos += ld1, dp->d_start = (long) pos;
202 dp->d_start = (long)pos , pos += (long) strlen (buffer);
203 for (bp = buffer; *bp; bp++, size++)
208 while (fgets (buffer, sizeof(buffer), fp) != NULL)
209 if (strcmp (buffer, mmdlm2) == 0)
212 pos += (long) strlen (buffer);
213 for (bp = buffer; *bp; bp++, size++)
218 if (dp->d_start != (long) pos) {
220 dp->d_size = (long) size;
227 register int curlen = dp - pp;
229 cp = (struct drop *) realloc ((char *) pp,
230 (size_t) (len += MAXFOLDER) * sizeof(*pp));
233 admonish (NULL, "unable to allocate drop storage");
237 dp = cp + curlen, ep = (pp = cp) + len - 1;
250 mbx_write(char *mailbox, int md, FILE *fp, int id, long last,
251 long pos, off_t stop, int mapping, int noisy)
253 register int i, j, size;
259 off = (long) lseek (md, (off_t) 0, SEEK_CUR);
261 if (write (md, mmdlm1, j) != j)
263 start = lseek (md, (off_t) 0, SEEK_CUR);
266 fseek (fp, pos, SEEK_SET);
267 while (fgets (buffer, sizeof(buffer), fp) && (pos < stop)) {
269 for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
271 for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
273 if (write (md, buffer, i) != i)
277 for (cp = buffer; i-- > 0; size++)
282 stop = lseek (md, (off_t) 0, SEEK_CUR);
284 if (write (md, mmdlm2, j) != j)
287 map_write (mailbox, md, id, last, start, stop, off, size, noisy);
294 * Append message to end of file or maildrop.
298 mbx_copy (char *mailbox, int mbx_style, int md, int fd,
299 int mapping, char *text, int noisy)
304 char *cp, buffer[BUFSIZ];
307 pos = (long) lseek (md, (off_t) 0, SEEK_CUR);
314 if (write (md, mmdlm1, j) != j)
316 start = lseek (md, (off_t) 0, SEEK_CUR);
320 if (write (md, text, i) != i)
322 for (cp = text; *cp++; size++)
327 while ((i = read (fd, buffer, sizeof(buffer))) > 0) {
329 (j = stringdex (mmdlm1, buffer)) >= 0;
333 (j = stringdex (mmdlm2, buffer)) >= 0;
336 if (write (md, buffer, i) != i)
339 for (cp = buffer; i-- > 0; size++)
344 stop = lseek (md, (off_t) 0, SEEK_CUR);
346 if (write (md, mmdlm2, j) != j)
349 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
351 return (i != NOTOK ? OK : NOTOK);
354 if ((j = dup (fd)) == NOTOK)
356 if ((fp = fdopen (j, "r")) == NULL) {
360 start = lseek (md, (off_t) 0, SEEK_CUR);
362 /* If text is given, we add it to top of message */
365 if (write (md, text, i) != i)
367 for (cp = text; *cp++; size++)
372 for (j = 0; fgets (buffer, sizeof(buffer), fp) != NULL; j++) {
375 * Check the first line, and make some changes.
377 if (j == 0 && !text) {
379 * Change the "Return-Path:" field (if in first line)
382 if (!strncmp (buffer, "Return-Path:", 12)) {
383 char tmpbuffer[BUFSIZ];
386 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
388 if (!(fp = strchr(ep + 1, ' ')))
389 fp = strchr(ep + 1, '\n');
390 tp = dctime(dlocaltimenow());
391 snprintf (buffer, sizeof(buffer), "From %.*s %s",
393 } else if (!strncmp (buffer, "X-Envelope-From:", 16)) {
395 * Change the "X-Envelope-From:" field
396 * (if first line) back to "From ".
398 char tmpbuffer[BUFSIZ];
401 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
403 snprintf (buffer, sizeof(buffer), "From %s", ep);
404 } else if (strncmp (buffer, "From ", 5)) {
406 * If there is already a "From " line,
407 * then leave it alone. Else we add one.
409 char tmpbuffer[BUFSIZ];
412 strncpy(tmpbuffer, buffer, sizeof(tmpbuffer));
413 ep = "nobody@nowhere";
414 tp = dctime(dlocaltimenow());
415 snprintf (buffer, sizeof(buffer), "From %s %s%s", ep, tp, tmpbuffer);
420 * If this is not first line, and begins with
421 * "From ", then prepend line with ">".
423 if (j != 0 && strncmp (buffer, "From ", 5) == 0) {
428 if (write (md, buffer, i) != i) {
433 for (cp = buffer; i-- > 0; size++)
437 if (write (md, "\n", 1) != 1) {
445 lseek (fd, (off_t) 0, SEEK_END);
446 stop = lseek (md, (off_t) 0, SEEK_CUR);
448 map_write (mailbox, md, 0, (long) 0, start, stop, pos, size, noisy);
456 mbx_size (int md, off_t start, off_t stop)
462 if ((fd = dup (md)) == NOTOK || (fp = fdopen (fd, "r")) == NULL) {
468 fseek (fp, start, SEEK_SET);
469 for (i = 0, pos = stop - start; pos-- > 0; i++)
470 if (fgetc (fp) == '\n')
479 * Close and unlock file/maildrop.
483 mbx_close (char *mailbox, int md)
485 lkclose (md, mailbox);
491 * This function is performed implicitly by getbbent.c:
492 * bb->bb_map = map_name (bb->bb_file);
496 map_name (char *file)
498 register char *cp, *dp;
499 static char buffer[BUFSIZ];
501 if ((dp = strchr(cp = r1bindex (file, '/'), '.')) == NULL)
502 dp = cp + strlen (cp);
504 snprintf (buffer, sizeof(buffer), ".%.*s%s", dp - cp, cp, ".map");
506 snprintf (buffer, sizeof(buffer), "%.*s.%.*s%s",
507 cp - file, file, dp - cp, cp, ".map");
514 map_read (char *file, long pos, struct drop **drops, int noisy)
516 register int i, md, msgp;
519 register struct drop *mp, *dp;
521 if ((md = open (cp = map_name (file), O_RDONLY)) == NOTOK
522 || map_chk (cp, md, mp = &d, pos, noisy)) {
529 dp = (struct drop *) calloc ((size_t) (msgp + 1), sizeof(*dp));
535 memcpy((char *) dp, (char *) mp, sizeof(*dp));
537 lseek (md, (off_t) sizeof(*mp), SEEK_SET);
538 if ((i = read (md, (char *) (dp + 1), msgp * sizeof(*dp))) < sizeof(*dp)) {
543 register struct drop *tdp;
546 for (j = 0, tdp = dp; j < i / sizeof(*dp); j++, tdp++) {
547 tdp->d_id = ntohl(tdp->d_id);
548 tdp->d_size = ntohl(tdp->d_size);
549 tdp->d_start = ntohl(tdp->d_start);
550 tdp->d_stop = ntohl(tdp->d_stop);
558 return (i / sizeof(*dp));
563 map_write (char *mailbox, int md, int id, long last, off_t start,
564 off_t stop, long pos, int size, int noisy)
569 register struct drop *dp;
570 struct drop d1, d2, *rp;
574 if ((fd = map_open (file = map_name (mailbox), md)) == NOTOK)
577 if ((fstat (fd, &st) == OK) && (st.st_size > 0))
582 if (!clear && map_chk (file, fd, &d1, pos, noisy)) {
584 mbx_close (file, fd);
585 if ((fd = map_open (file, md)) == NOTOK)
591 if ((td = dup (md)) == NOTOK || (fp = fdopen (td, "r")) == NULL) {
593 admonish (file, "unable to %s", td != NOTOK ? "fdopen" : "dup");
596 mbx_close (file, fd);
600 switch (i = mbx_read (fp, 0, &rp, noisy)) {
603 mbx_close (file, fd);
612 for (dp = rp; i-- >0; dp++) {
613 if (dp->d_start == start)
615 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
616 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
618 admonish (file, "write error");
619 mbx_close (file, fd);
634 dp->d_size = (long) (size ? size : mbx_size (fd, start, stop));
637 lseek (fd, (off_t) (++d1.d_id * sizeof(*dp)), SEEK_SET);
638 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
640 admonish (file, "write error");
641 mbx_close (file, fd);
648 dp->d_start = (long) last;
649 dp->d_stop = lseek (md, (off_t) 0, SEEK_CUR);
651 lseek (fd, (off_t) 0, SEEK_SET);
652 if (write (fd, (char *) dp, sizeof(*dp)) != sizeof(*dp)) {
654 admonish (file, "write error");
655 mbx_close (file, fd);
659 mbx_close (file, fd);
666 map_open (char *file, int md)
671 mode = fstat (md, &st) != NOTOK ? (mode_t) (st.st_mode & 0777) : m_gmprot ();
672 return mbx_open (file, OTHER_FORMAT, st.st_uid, st.st_gid, mode);
677 map_chk (char *file, int fd, struct drop *dp, long pos, int noisy)
681 register struct drop *dl;
683 if (read (fd, (char *) &tmpd, sizeof(*dp)) != sizeof(*dp)) {
685 admonish (NULL, "%s: missing or partial index", file);
690 *dp = tmpd; /* if ntohl(n)=(n), can use struct assign */
692 dp->d_id = ntohl(tmpd.d_id);
693 dp->d_size = ntohl(tmpd.d_size);
694 dp->d_start = ntohl(tmpd.d_start);
695 dp->d_stop = ntohl(tmpd.d_stop);
698 if (dp->d_size != DRVRSN) {
700 admonish (NULL, "%s: version mismatch (%d != %d)", file,
705 if (dp->d_stop != pos) {
706 if (noisy && pos != (long) 0)
708 "%s: pointer mismatch or incomplete index (%ld!=%ld)",
709 file, dp->d_stop, (long) pos);
713 if ((long) ((dp->d_id + 1) * sizeof(*dp)) != (long) lseek (fd, (off_t) 0, SEEK_END)) {
715 admonish (NULL, "%s: corrupt index(1)", file);
720 count = (long) strlen (mmdlm2);
721 lseek (fd, (off_t) (dp->d_id * sizeof(*dp)), SEEK_SET);
722 if (read (fd, (char *) dl, sizeof(*dl)) != sizeof(*dl)
723 || (ntohl(dl->d_stop) != dp->d_stop
724 && ntohl(dl->d_stop) + count != dp->d_stop)) {
726 admonish (NULL, "%s: corrupt index(2)", file);