2 * Utility routines used in rsync.
4 * Copyright (C) 1996-2000 Andrew Tridgell
5 * Copyright (C) 1996 Paul Mackerras
6 * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
7 * Copyright (C) 2003-2015 Wayne Davison
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, visit the http://fsf.org website.
30 extern int protect_args;
31 extern int modify_window;
32 extern int relative_paths;
33 extern int preserve_times;
34 extern int preserve_xattrs;
35 extern int preallocate_files;
36 extern char *module_dir;
37 extern unsigned int module_dirlen;
38 extern char *partial_dir;
39 extern filter_rule_list daemon_filter_list;
41 int sanitize_paths = 0;
43 char curr_dir[MAXPATHLEN];
44 unsigned int curr_dir_len;
45 int curr_dir_depth; /* This is only set for a sanitizing daemon. */
47 /* Set a fd into nonblocking mode. */
48 void set_nonblocking(int fd)
52 if ((val = fcntl(fd, F_GETFL)) == -1)
54 if (!(val & NONBLOCK_FLAG)) {
56 fcntl(fd, F_SETFL, val);
60 /* Set a fd into blocking mode. */
61 void set_blocking(int fd)
65 if ((val = fcntl(fd, F_GETFL)) == -1)
67 if (val & NONBLOCK_FLAG) {
68 val &= ~NONBLOCK_FLAG;
69 fcntl(fd, F_SETFL, val);
74 * Create a file descriptor pair - like pipe() but use socketpair if
75 * possible (because of blocking issues on pipes).
77 * Always set non-blocking.
79 int fd_pair(int fd[2])
83 #ifdef HAVE_SOCKETPAIR
84 ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
90 set_nonblocking(fd[0]);
91 set_nonblocking(fd[1]);
97 void print_child_argv(const char *prefix, char **cmd)
100 rprintf(FCLIENT, "%s ", prefix);
101 for (; *cmd; cmd++) {
102 /* Look for characters that ought to be quoted. This
103 * is not a great quoting algorithm, but it's
104 * sufficient for a log message. */
105 if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz"
106 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
108 ",.-_=+@/") != strlen(*cmd)) {
109 rprintf(FCLIENT, "\"%s\" ", *cmd);
111 rprintf(FCLIENT, "%s ", *cmd);
115 rprintf(FCLIENT, " (%d args)\n", cnt);
118 /* This returns 0 for success, 1 for a symlink if symlink time-setting
119 * is not possible, or -1 for any other error. */
120 int set_modtime(const char *fname, time_t modtime, uint32 mod_nsec, mode_t mode)
122 static int switch_step = 0;
124 if (DEBUG_GTE(TIME, 1)) {
125 rprintf(FINFO, "set modtime of %s to (%ld) %s",
126 fname, (long)modtime,
127 asctime(localtime(&modtime)));
130 switch (switch_step) {
131 #ifdef HAVE_UTIMENSAT
133 if (do_utimensat(fname, modtime, mod_nsec) == 0)
143 if (do_lutimes(fname, modtime, mod_nsec) == 0)
153 if (preserve_times & PRESERVE_LINK_TIMES) {
154 preserve_times &= ~PRESERVE_LINK_TIMES;
162 if (do_utimes(fname, modtime, mod_nsec) == 0)
165 if (do_utime(fname, modtime, mod_nsec) == 0)
175 /* Create any necessary directories in fname. Any missing directories are
176 * created with default permissions. Returns < 0 on error, or the number
177 * of directories created. */
178 int make_path(char *fname, int flags)
183 if (flags & MKP_SKIP_SLASH) {
184 while (*fname == '/')
188 while (*fname == '.' && fname[1] == '/')
191 if (flags & MKP_DROP_NAME) {
192 end = strrchr(fname, '/');
193 if (!end || end == fname)
197 end = fname + strlen(fname);
199 /* Try to find an existing dir, starting from the deepest dir. */
203 if (do_stat(fname, &st) == 0) {
204 if (S_ISDIR(st.st_mode))
209 } else if (do_mkdir(fname, ACCESSPERMS) == 0) {
214 if (errno != ENOENT) {
216 if (errno != EEXIST || (do_stat(fname, &st) == 0 && !S_ISDIR(st.st_mode)))
222 /* We got a relative path that doesn't exist, so assume that '.'
223 * is there and just break out and create the whole thing. */
229 /* We reached the "/" dir, which we assume is there. */
239 /* Make all the dirs that we didn't find on the way here. */
246 if (ret < 0) /* Skip mkdir on error, but keep restoring the path. */
248 if (do_mkdir(fname, ACCESSPERMS) < 0)
254 if (flags & MKP_DROP_NAME)
261 * Write @p len bytes at @p ptr to descriptor @p desc, retrying if
264 * @retval len upon success
266 * @retval <0 write's (negative) error code
268 * Derived from GNU C's cccp.c.
270 int full_write(int desc, const char *ptr, size_t len)
276 int written = write(desc, ptr, len);
282 total_written += written;
286 return total_written;
290 * Read @p len bytes at @p ptr from descriptor @p desc, retrying if
293 * @retval >0 the actual number of bytes read
297 * @retval <0 for an error.
299 * Derived from GNU C's cccp.c. */
300 static int safe_read(int desc, char *ptr, size_t len)
308 n_chars = read(desc, ptr, len);
309 } while (n_chars < 0 && errno == EINTR);
314 /* Copy a file. If ofd < 0, copy_file unlinks and opens the "dest" file.
315 * Otherwise, it just writes to and closes the provided file descriptor.
316 * In either case, if --xattrs are being preserved, the dest file will
317 * have its xattrs set from the source file.
319 * This is used in conjunction with the --temp-dir, --backup, and
320 * --copy-dest options. */
321 int copy_file(const char *source, const char *dest, int ofd, mode_t mode)
325 int len; /* Number of bytes read into `buf'. */
326 #ifdef PREALLOCATE_NEEDS_TRUNCATE
327 OFF_T preallocated_len = 0, offset = 0;
330 if ((ifd = do_open(source, O_RDONLY, 0)) < 0) {
331 int save_errno = errno;
332 rsyserr(FERROR_XFER, errno, "open %s", full_fname(source));
338 if (robust_unlink(dest) && errno != ENOENT) {
339 int save_errno = errno;
340 rsyserr(FERROR_XFER, errno, "unlink %s", full_fname(dest));
345 #ifdef SUPPORT_XATTRS
349 mode &= INITACCESSPERMS;
350 if ((ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0) {
351 int save_errno = errno;
352 rsyserr(FERROR_XFER, save_errno, "open %s", full_fname(dest));
359 #ifdef SUPPORT_PREALLOCATION
360 if (preallocate_files) {
363 /* Try to preallocate enough space for file's eventual length. Can
364 * reduce fragmentation on filesystems like ext4, xfs, and NTFS. */
365 if (do_fstat(ifd, &srcst) < 0)
366 rsyserr(FWARNING, errno, "fstat %s", full_fname(source));
367 else if (srcst.st_size > 0) {
368 if (do_fallocate(ofd, 0, srcst.st_size) == 0) {
369 #ifdef PREALLOCATE_NEEDS_TRUNCATE
370 preallocated_len = srcst.st_size;
373 rsyserr(FWARNING, errno, "do_fallocate %s", full_fname(dest));
378 while ((len = safe_read(ifd, buf, sizeof buf)) > 0) {
379 if (full_write(ofd, buf, len) < 0) {
380 int save_errno = errno;
381 rsyserr(FERROR_XFER, errno, "write %s", full_fname(dest));
387 #ifdef PREALLOCATE_NEEDS_TRUNCATE
393 int save_errno = errno;
394 rsyserr(FERROR_XFER, errno, "read %s", full_fname(source));
401 if (close(ifd) < 0) {
402 rsyserr(FWARNING, errno, "close failed on %s",
406 #ifdef PREALLOCATE_NEEDS_TRUNCATE
407 /* Source file might have shrunk since we fstatted it.
408 * Cut off any extra preallocated zeros from dest file. */
409 if (offset < preallocated_len && do_ftruncate(ofd, offset) < 0) {
410 /* If we fail to truncate, the dest file may be wrong, so we
411 * must trigger the "partial transfer" error. */
412 rsyserr(FERROR_XFER, errno, "ftruncate %s", full_fname(dest));
416 if (close(ofd) < 0) {
417 int save_errno = errno;
418 rsyserr(FERROR_XFER, errno, "close failed on %s",
424 #ifdef SUPPORT_XATTRS
426 copy_xattrs(source, dest);
432 /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */
433 #define MAX_RENAMES_DIGITS 3
434 #define MAX_RENAMES 1000
437 * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so
438 * rename to <path>/.rsyncNNN instead.
440 * Note that successive rsync runs will shuffle the filenames around a
441 * bit as long as the file is still busy; this is because this function
442 * does not know if the unlink call is due to a new file coming in, or
443 * --delete trying to remove old .rsyncNNN files, hence it renames it
446 int robust_unlink(const char *fname)
449 return do_unlink(fname);
451 static int counter = 1;
453 char path[MAXPATHLEN];
455 rc = do_unlink(fname);
456 if (rc == 0 || errno != ETXTBSY)
459 if ((pos = strlcpy(path, fname, MAXPATHLEN)) >= MAXPATHLEN)
460 pos = MAXPATHLEN - 1;
462 while (pos > 0 && path[pos-1] != '/')
464 pos += strlcpy(path+pos, ".rsync", MAXPATHLEN-pos);
466 if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) {
471 /* start where the last one left off to reduce chance of clashes */
474 snprintf(&path[pos], MAX_RENAMES_DIGITS+1, "%03d", counter);
475 if (++counter >= MAX_RENAMES)
477 } while ((rc = access(path, 0)) == 0 && counter != start);
479 if (INFO_GTE(MISC, 1)) {
480 rprintf(FWARNING, "renaming %s to %s because of text busy\n",
484 /* maybe we should return rename()'s exit status? Nah. */
485 if (do_rename(fname, path) != 0) {
493 /* Returns 0 on successful rename, 1 if we successfully copied the file
494 * across filesystems, -2 if copy_file() failed, and -1 on other errors.
495 * If partialptr is not NULL and we need to do a copy, copy the file into
496 * the active partial-dir instead of over the destination file. */
497 int robust_rename(const char *from, const char *to, const char *partialptr,
503 if (do_rename(from, to) == 0)
509 if (robust_unlink(to) != 0) {
518 if (!handle_partial_dir(partialptr,PDIR_CREATE))
522 if (copy_file(from, to, -1, mode) != 0)
533 static pid_t all_pids[10];
536 /** Fork and record the pid of the child. **/
539 pid_t newpid = fork();
541 if (newpid != 0 && newpid != -1) {
542 all_pids[num_pids++] = newpid;
550 * @todo It would be kind of nice to make sure that they are actually
551 * all our children before we kill them, because their pids may have
552 * been recycled by some other process. Perhaps when we wait for a
553 * child, we should remove it from this array. Alternatively we could
554 * perhaps use process groups, but I think that would not work on
555 * ancient Unix versions that don't support them.
557 void kill_all(int sig)
561 for (i = 0; i < num_pids; i++) {
562 /* Let's just be a little careful where we
563 * point that gun, hey? See kill(2) for the
564 * magic caused by negative values. */
565 pid_t p = all_pids[i];
576 /** Lock a byte range in a open file */
577 int lock_range(int fd, int offset, int len)
581 lock.l_type = F_WRLCK;
582 lock.l_whence = SEEK_SET;
583 lock.l_start = offset;
587 return fcntl(fd,F_SETLK,&lock) == 0;
590 #define ENSURE_MEMSPACE(buf, type, sz, req) \
591 if ((req) > sz && !(buf = realloc_array(buf, type, sz = MAX(sz * 2, req)))) \
592 out_of_memory("glob_expand")
594 static inline void call_glob_match(const char *name, int len, int from_glob,
595 char *arg, int abpos, int fbpos);
597 static struct glob_data {
598 char *arg_buf, *filt_buf, **argv;
599 int absize, fbsize, maxargs, argc;
602 static void glob_match(char *arg, int abpos, int fbpos)
607 while (*arg == '.' && arg[1] == '/') {
609 ENSURE_MEMSPACE(glob.filt_buf, char, glob.fbsize, glob.absize);
610 memcpy(glob.filt_buf, glob.arg_buf, abpos + 1);
613 ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, abpos + 3);
614 glob.arg_buf[abpos++] = *arg++;
615 glob.arg_buf[abpos++] = *arg++;
616 glob.arg_buf[abpos] = '\0';
618 if ((slash = strchr(arg, '/')) != NULL) {
623 if (strpbrk(arg, "*?[")) {
627 if (!(d = opendir(abpos ? glob.arg_buf : ".")))
629 while ((di = readdir(d)) != NULL) {
630 char *dname = d_name(di);
631 if (dname[0] == '.' && (dname[1] == '\0'
632 || (dname[1] == '.' && dname[2] == '\0')))
634 if (!wildmatch(arg, dname))
636 call_glob_match(dname, strlen(dname), 1,
637 slash ? arg + len + 1 : NULL,
642 call_glob_match(arg, len, 0,
643 slash ? arg + len + 1 : NULL,
650 static inline void call_glob_match(const char *name, int len, int from_glob,
651 char *arg, int abpos, int fbpos)
655 ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, abpos + len + 2);
656 memcpy(glob.arg_buf + abpos, name, len);
658 glob.arg_buf[abpos] = '\0';
661 ENSURE_MEMSPACE(glob.filt_buf, char, glob.fbsize, fbpos + len + 2);
662 memcpy(glob.filt_buf + fbpos, name, len);
664 glob.filt_buf[fbpos] = '\0';
665 use_buf = glob.filt_buf;
667 use_buf = glob.arg_buf;
669 if (from_glob || (arg && len)) {
673 if (do_stat(glob.arg_buf, &st) != 0)
675 is_dir = S_ISDIR(st.st_mode) != 0;
679 if (daemon_filter_list.head
680 && check_filter(&daemon_filter_list, FLOG, use_buf, is_dir) < 0)
685 glob.arg_buf[abpos++] = '/';
686 glob.arg_buf[abpos] = '\0';
688 glob.filt_buf[fbpos++] = '/';
689 glob.filt_buf[fbpos] = '\0';
691 glob_match(arg, abpos, fbpos);
693 ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, glob.argc + 1);
694 if (!(glob.argv[glob.argc++] = strdup(glob.arg_buf)))
695 out_of_memory("glob_match");
699 /* This routine performs wild-card expansion of the pathname in "arg". Any
700 * daemon-excluded files/dirs will not be matched by the wildcards. Returns 0
701 * if a wild-card string is the only returned item (due to matching nothing). */
702 int glob_expand(const char *arg, char ***argv_p, int *argc_p, int *maxargs_p)
711 memset(&glob, 0, sizeof glob);
716 s = sanitize_path(NULL, arg, "", 0, SP_KEEP_DOT_DIRS);
720 out_of_memory("glob_expand");
721 clean_fname(s, CFN_KEEP_DOT_DIRS
722 | CFN_KEEP_TRAILING_SLASH
723 | CFN_COLLAPSE_DOT_DOT_DIRS);
726 ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, MAXPATHLEN);
727 *glob.arg_buf = '\0';
729 glob.argc = save_argc = *argc_p;
731 glob.maxargs = *maxargs_p;
733 ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, 100);
735 glob_match(s, 0, -1);
737 /* The arg didn't match anything, so add the failed arg to the list. */
738 if (glob.argc == save_argc) {
739 ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, glob.argc + 1);
740 glob.argv[glob.argc++] = s;
747 *maxargs_p = glob.maxargs;
754 /* This routine is only used in daemon mode. */
755 void glob_expand_module(char *base1, char *arg, char ***argv_p, int *argc_p, int *maxargs_p)
759 int base_len = strlen(base);
764 if (strncmp(arg, base, base_len) == 0)
768 glob_expand(arg, argv_p, argc_p, maxargs_p);
772 if (!(arg = strdup(arg)))
773 out_of_memory("glob_expand_module");
775 if (asprintf(&base," %s/", base1) < 0)
776 out_of_memory("glob_expand_module");
779 for (s = arg; *s; s = p + base_len) {
780 if ((p = strstr(s, base)) != NULL)
781 *p = '\0'; /* split it at this point */
782 glob_expand(s, argv_p, argc_p, maxargs_p);
792 * Convert a string to lower case
794 void strlower(char *s)
803 /* Join strings p1 & p2 into "dest" with a guaranteed '/' between them. (If
804 * p1 ends with a '/', no extra '/' is inserted.) Returns the length of both
805 * strings + 1 (if '/' was inserted), regardless of whether the null-terminated
806 * string fits into destsize. */
807 size_t pathjoin(char *dest, size_t destsize, const char *p1, const char *p2)
809 size_t len = strlcpy(dest, p1, destsize);
810 if (len < destsize - 1) {
811 if (!len || dest[len-1] != '/')
813 if (len < destsize - 1)
814 len += strlcpy(dest + len, p2, destsize - len);
821 len += strlen(p2) + 1; /* Assume we'd insert a '/'. */
825 /* Join any number of strings together, putting them in "dest". The return
826 * value is the length of all the strings, regardless of whether the null-
827 * terminated whole fits in destsize. Your list of string pointers must end
828 * with a NULL to indicate the end of the list. */
829 size_t stringjoin(char *dest, size_t destsize, ...)
835 va_start(ap, destsize);
837 if (!(src = va_arg(ap, const char *)))
844 memcpy(dest, src, len);
855 int count_dir_elements(const char *p)
857 int cnt = 0, new_component = 1;
860 new_component = (*p != '.' || (p[1] != '/' && p[1] != '\0'));
861 else if (new_component) {
869 /* Turns multiple adjacent slashes into a single slash (possible exception:
870 * the preserving of two leading slashes at the start), drops all leading or
871 * interior "." elements unless CFN_KEEP_DOT_DIRS is flagged. Will also drop
872 * a trailing '.' after a '/' if CFN_DROP_TRAILING_DOT_DIR is flagged, removes
873 * a trailing slash (perhaps after removing the aforementioned dot) unless
874 * CFN_KEEP_TRAILING_SLASH is flagged, and will also collapse ".." elements
875 * (except at the start) if CFN_COLLAPSE_DOT_DOT_DIRS is flagged. If the
876 * resulting name would be empty, returns ".". */
877 int clean_fname(char *name, int flags)
879 char *limit = name - 1, *t = name, *f = name;
885 #define DOT_IS_DOT_DOT_DIR(bp) (bp[1] == '.' && (bp[2] == '/' || !bp[2]))
887 if ((anchored = *f == '/') != 0) {
890 /* If there are exactly 2 slashes at the start, preserve
891 * them. Would break daemon excludes unless the paths are
892 * really treated differently, so used this sparingly. */
893 if (*f == '/' && f[1] != '/')
896 } else if (flags & CFN_KEEP_DOT_DIRS && *f == '.' && f[1] == '/') {
899 } else if (flags & CFN_REFUSE_DOT_DOT_DIRS && *f == '.' && DOT_IS_DOT_DOT_DIR(f))
902 /* discard extra slashes */
908 /* discard interior "." dirs */
909 if (f[1] == '/' && !(flags & CFN_KEEP_DOT_DIRS)) {
913 if (f[1] == '\0' && flags & CFN_DROP_TRAILING_DOT_DIR)
915 /* collapse ".." dirs */
916 if (flags & (CFN_COLLAPSE_DOT_DOT_DIRS|CFN_REFUSE_DOT_DOT_DIRS) && DOT_IS_DOT_DOT_DIR(f)) {
918 if (flags & CFN_REFUSE_DOT_DOT_DIRS)
920 if (s == name && anchored) {
924 while (s > limit && *--s != '/') {}
925 if (s != t - 1 && (s < name || *s == '/')) {
933 while (*f && (*t++ = *f++) != '/') {}
936 if (t > name+anchored && t[-1] == '/' && !(flags & CFN_KEEP_TRAILING_SLASH))
942 #undef DOT_IS_DOT_DOT_DIR
947 /* Make path appear as if a chroot had occurred. This handles a leading
948 * "/" (either removing it or expanding it) and any leading or embedded
949 * ".." components that attempt to escape past the module's top dir.
951 * If dest is NULL, a buffer is allocated to hold the result. It is legal
952 * to call with the dest and the path (p) pointing to the same buffer, but
953 * rootdir will be ignored to avoid expansion of the string.
955 * The rootdir string contains a value to use in place of a leading slash.
956 * Specify NULL to get the default of "module_dir".
958 * The depth var is a count of how many '..'s to allow at the start of the
961 * We also clean the path in a manner similar to clean_fname() but with a
964 * Turns multiple adjacent slashes into a single slash, gets rid of "." dir
965 * elements (INCLUDING a trailing dot dir), PRESERVES a trailing slash, and
966 * ALWAYS collapses ".." elements (except for those at the start of the
967 * string up to "depth" deep). If the resulting name would be empty,
968 * change it into a ".". */
969 char *sanitize_path(char *dest, const char *p, const char *rootdir, int depth,
973 int rlen = 0, drop_dot_dirs = !relative_paths || !(flags & SP_KEEP_DOT_DIRS);
976 int plen = strlen(p);
979 rootdir = module_dir;
980 rlen = strlen(rootdir);
985 if (rlen + plen + 1 >= MAXPATHLEN)
987 } else if (!(dest = new_array(char, rlen + plen + 1)))
988 out_of_memory("sanitize_path");
990 memcpy(dest, rootdir, rlen);
997 while (*p == '.' && p[1] == '/')
1001 start = sanp = dest + rlen;
1002 /* This loop iterates once per filename component in p, pointing at
1003 * the start of the name (past any prior slash) for each iteration. */
1005 /* discard leading or extra slashes */
1010 if (drop_dot_dirs) {
1011 if (*p == '.' && (p[1] == '/' || p[1] == '\0')) {
1012 /* skip "." component */
1017 if (*p == '.' && p[1] == '.' && (p[2] == '/' || p[2] == '\0')) {
1018 /* ".." component followed by slash or end */
1019 if (depth <= 0 || sanp != start) {
1021 if (sanp != start) {
1022 /* back up sanp one level */
1023 --sanp; /* now pointing at slash */
1024 while (sanp > start && sanp[-1] != '/')
1029 /* allow depth levels of .. at the beginning */
1031 /* move the virtual beginning to leave the .. alone */
1034 /* copy one component through next slash */
1035 while (*p && (*sanp++ = *p++) != '/') {}
1038 /* ended up with nothing, so put in "." component */
1046 /* Like chdir(), but it keeps track of the current directory (in the
1047 * global "curr_dir"), and ensures that the path size doesn't overflow.
1048 * Also cleans the path using the clean_fname() function. */
1049 int change_dir(const char *dir, int set_path_only)
1051 static int initialised, skipped_chdir;
1056 if (getcwd(curr_dir, sizeof curr_dir - 1) == NULL) {
1057 rsyserr(FERROR, errno, "getcwd()");
1058 exit_cleanup(RERR_FILESELECT);
1060 curr_dir_len = strlen(curr_dir);
1063 if (!dir) /* this call was probably just to initialize */
1067 if (len == 1 && *dir == '.' && (!skipped_chdir || set_path_only))
1071 if (len >= sizeof curr_dir) {
1072 errno = ENAMETOOLONG;
1075 if (!set_path_only && chdir(dir))
1077 skipped_chdir = set_path_only;
1078 memcpy(curr_dir, dir, len + 1);
1080 if (curr_dir_len + 1 + len >= sizeof curr_dir) {
1081 errno = ENAMETOOLONG;
1084 if (!(curr_dir_len && curr_dir[curr_dir_len-1] == '/'))
1085 curr_dir[curr_dir_len++] = '/';
1086 memcpy(curr_dir + curr_dir_len, dir, len + 1);
1088 if (!set_path_only && chdir(curr_dir)) {
1089 curr_dir[curr_dir_len] = '\0';
1092 skipped_chdir = set_path_only;
1095 curr_dir_len = clean_fname(curr_dir, CFN_COLLAPSE_DOT_DOT_DIRS | CFN_DROP_TRAILING_DOT_DIR);
1096 if (sanitize_paths) {
1097 if (module_dirlen > curr_dir_len)
1098 module_dirlen = curr_dir_len;
1099 curr_dir_depth = count_dir_elements(curr_dir + module_dirlen);
1102 if (DEBUG_GTE(CHDIR, 1) && !set_path_only)
1103 rprintf(FINFO, "[%s] change_dir(%s)\n", who_am_i(), curr_dir);
1108 /* This will make a relative path absolute and clean it up via clean_fname().
1109 * Returns the string, which might be newly allocated, or NULL on error. */
1110 char *normalize_path(char *path, BOOL force_newbuf, unsigned int *len_ptr)
1114 if (*path != '/') { /* Make path absolute. */
1115 int len = strlen(path);
1116 if (curr_dir_len + 1 + len >= sizeof curr_dir)
1118 curr_dir[curr_dir_len] = '/';
1119 memcpy(curr_dir + curr_dir_len + 1, path, len + 1);
1120 if (!(path = strdup(curr_dir)))
1121 out_of_memory("normalize_path");
1122 curr_dir[curr_dir_len] = '\0';
1123 } else if (force_newbuf) {
1124 if (!(path = strdup(path)))
1125 out_of_memory("normalize_path");
1128 len = clean_fname(path, CFN_COLLAPSE_DOT_DOT_DIRS | CFN_DROP_TRAILING_DOT_DIR);
1137 * Return a quoted string with the full pathname of the indicated filename.
1138 * The string " (in MODNAME)" may also be appended. The returned pointer
1139 * remains valid until the next time full_fname() is called.
1141 char *full_fname(const char *fn)
1143 static char *result = NULL;
1153 p1 = curr_dir + module_dirlen;
1154 for (p2 = p1; *p2 == '/'; p2++) {}
1158 if (module_id >= 0) {
1160 m2 = lp_name(module_id);
1165 if (asprintf(&result, "\"%s%s%s\"%s%s%s", p1, p2, fn, m1, m2, m3) < 0)
1166 out_of_memory("full_fname");
1171 static char partial_fname[MAXPATHLEN];
1173 char *partial_dir_fname(const char *fname)
1175 char *t = partial_fname;
1176 int sz = sizeof partial_fname;
1179 if ((fn = strrchr(fname, '/')) != NULL) {
1181 if (*partial_dir != '/') {
1182 int len = fn - fname;
1183 strncpy(t, fname, len); /* safe */
1189 if ((int)pathjoin(t, sz, partial_dir, fn) >= sz)
1191 if (daemon_filter_list.head) {
1192 t = strrchr(partial_fname, '/');
1194 if (check_filter(&daemon_filter_list, FLOG, partial_fname, 1) < 0)
1197 if (check_filter(&daemon_filter_list, FLOG, partial_fname, 0) < 0)
1201 return partial_fname;
1204 /* If no --partial-dir option was specified, we don't need to do anything
1205 * (the partial-dir is essentially '.'), so just return success. */
1206 int handle_partial_dir(const char *fname, int create)
1210 if (fname != partial_fname)
1212 if (!create && *partial_dir == '/')
1214 if (!(fn = strrchr(partial_fname, '/')))
1218 dir = partial_fname;
1221 int statret = do_lstat(dir, &st);
1222 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1223 if (do_unlink(dir) < 0) {
1229 if (statret < 0 && do_mkdir(dir, 0700) < 0) {
1240 /* Determine if a symlink points outside the current directory tree.
1241 * This is considered "unsafe" because e.g. when mirroring somebody
1242 * else's machine it might allow them to establish a symlink to
1243 * /etc/passwd, and then read it through a web server.
1245 * Returns 1 if unsafe, 0 if safe.
1247 * Null symlinks and absolute symlinks are always unsafe.
1249 * Basically here we are concerned with symlinks whose target contains
1250 * "..", because this might cause us to walk back up out of the
1251 * transferred directory. We are not allowed to go back up and
1254 * "dest" is the target of the symlink in question.
1256 * "src" is the top source directory currently applicable at the level
1257 * of the referenced symlink. This is usually the symlink's full path
1258 * (including its name), as referenced from the root of the transfer. */
1259 int unsafe_symlink(const char *dest, const char *src)
1261 const char *name, *slash;
1264 /* all absolute and null symlinks are unsafe */
1265 if (!dest || !*dest || *dest == '/')
1268 /* find out what our safety margin is */
1269 for (name = src; (slash = strchr(name, '/')) != 0; name = slash+1) {
1270 /* ".." segment starts the count over. "." segment is ignored. */
1271 if (*name == '.' && (name[1] == '/' || (name[1] == '.' && name[2] == '/'))) {
1276 while (slash[1] == '/') slash++; /* just in case src isn't clean */
1278 if (*name == '.' && name[1] == '.' && name[2] == '\0')
1281 for (name = dest; (slash = strchr(name, '/')) != 0; name = slash+1) {
1282 if (*name == '.' && (name[1] == '/' || (name[1] == '.' && name[2] == '/'))) {
1283 if (name[1] == '.') {
1284 /* if at any point we go outside the current directory
1285 then stop - it is unsafe */
1291 while (slash[1] == '/') slash++;
1293 if (*name == '.' && name[1] == '.' && name[2] == '\0')
1299 /* Return the date and time as a string. Some callers tweak returned buf. */
1300 char *timestring(time_t t)
1302 static char TimeBuf[200];
1303 struct tm *tm = localtime(&t);
1306 #ifdef HAVE_STRFTIME
1307 strftime(TimeBuf, sizeof TimeBuf - 1, "%Y/%m/%d %H:%M:%S", tm);
1309 strlcpy(TimeBuf, asctime(tm), sizeof TimeBuf);
1312 if ((p = strchr(TimeBuf, '\n')) != NULL)
1318 /* Determine if two time_t values are equivalent (either exact, or in
1319 * the modification timestamp window established by --modify-window).
1321 * @retval 0 if the times should be treated as the same
1323 * @retval +1 if the first is later
1325 * @retval -1 if the 2nd is later
1327 int cmp_time(time_t file1, time_t file2)
1329 if (file2 > file1) {
1330 /* The final comparison makes sure that modify_window doesn't overflow a
1331 * time_t, which would mean that file2 must be in the equality window. */
1332 if (!modify_window || (file2 > file1 + modify_window && file1 + modify_window > file1))
1334 } else if (file1 > file2) {
1335 if (!modify_window || (file1 > file2 + modify_window && file2 + modify_window > file2))
1345 This routine is a trick to immediately catch errors when debugging
1346 with insure. A xterm with a gdb is popped up when insure catches
1347 a error. It is Linux specific.
1349 int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6)
1352 int ret, pid_int = getpid();
1356 "/usr/X11R6/bin/xterm -display :0 -T Panic -n Panic -e /bin/sh -c 'cat /tmp/ierrs.*.%d ; "
1357 "gdb /proc/%d/exe %d'", pid_int, pid_int, pid_int) < 0)
1362 h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY);
1363 fn = dlsym(h, "_Insure_trap_error");
1366 ret = fn(a1, a2, a3, a4, a5, a6);
1376 /* Take a filename and filename length and return the most significant
1377 * filename suffix we can find. This ignores suffixes such as "~",
1378 * ".bak", ".orig", ".~1~", etc. */
1379 const char *find_filename_suffix(const char *fn, int fn_len, int *len_ptr)
1381 const char *suf, *s;
1385 /* One or more dots at the start aren't a suffix. */
1386 while (fn_len && *fn == '.') fn++, fn_len--;
1388 /* Ignore the ~ in a "foo~" filename. */
1389 if (fn_len > 1 && fn[fn_len-1] == '~')
1390 fn_len--, had_tilde = True;
1394 /* Assume we don't find an suffix. */
1398 /* Find the last significant suffix. */
1399 for (s = fn + fn_len; fn_len > 1; ) {
1400 while (*--s != '.' && s != fn) {}
1403 s_len = fn_len - (s - fn);
1406 if (strcmp(s+1, "bak") == 0
1407 || strcmp(s+1, "old") == 0)
1409 } else if (s_len == 5) {
1410 if (strcmp(s+1, "orig") == 0)
1412 } else if (s_len > 2 && had_tilde
1413 && s[1] == '~' && isDigit(s + 2))
1419 /* Determine if the suffix is all digits. */
1420 for (s++, s_len--; s_len > 0; s++, s_len--) {
1424 /* An all-digit suffix may not be that signficant. */
1431 /* This is an implementation of the Levenshtein distance algorithm. It
1432 * was implemented to avoid needing a two-dimensional matrix (to save
1433 * memory). It was also tweaked to try to factor in the ASCII distance
1434 * between changed characters as a minor distance quantity. The normal
1435 * Levenshtein units of distance (each signifying a single change between
1436 * the two strings) are defined as a "UNIT". */
1438 #define UNIT (1 << 16)
1440 uint32 fuzzy_distance(const char *s1, unsigned len1, const char *s2, unsigned len2)
1442 uint32 a[MAXPATHLEN], diag, above, left, diag_inc, above_inc, left_inc;
1446 if (!len1 || !len2) {
1451 for (i1 = 0, cost = 0; i1 < len1; i1++)
1453 return (int32)len1 * UNIT + cost;
1456 for (i2 = 0; i2 < len2; i2++)
1457 a[i2] = (i2+1) * UNIT;
1459 for (i1 = 0; i1 < len1; i1++) {
1461 above = (i1+1) * UNIT;
1462 for (i2 = 0; i2 < len2; i2++) {
1464 if ((cost = *((uchar*)s1+i1) - *((uchar*)s2+i2)) != 0) {
1470 diag_inc = diag + cost;
1471 left_inc = left + UNIT + *((uchar*)s1+i1);
1472 above_inc = above + UNIT + *((uchar*)s2+i2);
1473 a[i2] = above = left < above
1474 ? (left_inc < diag_inc ? left_inc : diag_inc)
1475 : (above_inc < diag_inc ? above_inc : diag_inc);
1483 #define BB_SLOT_SIZE (16*1024) /* Desired size in bytes */
1484 #define BB_PER_SLOT_BITS (BB_SLOT_SIZE * 8) /* Number of bits per slot */
1485 #define BB_PER_SLOT_INTS (BB_SLOT_SIZE / 4) /* Number of int32s per slot */
1492 struct bitbag *bitbag_create(int max_ndx)
1494 struct bitbag *bb = new(struct bitbag);
1495 bb->slot_cnt = (max_ndx + BB_PER_SLOT_BITS - 1) / BB_PER_SLOT_BITS;
1497 if (!(bb->bits = (uint32**)calloc(bb->slot_cnt, sizeof (uint32*))))
1498 out_of_memory("bitbag_create");
1503 void bitbag_set_bit(struct bitbag *bb, int ndx)
1505 int slot = ndx / BB_PER_SLOT_BITS;
1506 ndx %= BB_PER_SLOT_BITS;
1508 if (!bb->bits[slot]) {
1509 if (!(bb->bits[slot] = (uint32*)calloc(BB_PER_SLOT_INTS, 4)))
1510 out_of_memory("bitbag_set_bit");
1513 bb->bits[slot][ndx/32] |= 1u << (ndx % 32);
1516 #if 0 /* not needed yet */
1517 void bitbag_clear_bit(struct bitbag *bb, int ndx)
1519 int slot = ndx / BB_PER_SLOT_BITS;
1520 ndx %= BB_PER_SLOT_BITS;
1522 if (!bb->bits[slot])
1525 bb->bits[slot][ndx/32] &= ~(1u << (ndx % 32));
1528 int bitbag_check_bit(struct bitbag *bb, int ndx)
1530 int slot = ndx / BB_PER_SLOT_BITS;
1531 ndx %= BB_PER_SLOT_BITS;
1533 if (!bb->bits[slot])
1536 return bb->bits[slot][ndx/32] & (1u << (ndx % 32)) ? 1 : 0;
1540 /* Call this with -1 to start checking from 0. Returns -1 at the end. */
1541 int bitbag_next_bit(struct bitbag *bb, int after)
1544 int i, ndx = after + 1;
1545 int slot = ndx / BB_PER_SLOT_BITS;
1546 ndx %= BB_PER_SLOT_BITS;
1548 mask = (1u << (ndx % 32)) - 1;
1549 for (i = ndx / 32; slot < bb->slot_cnt; slot++, i = mask = 0) {
1550 if (!bb->bits[slot])
1552 for ( ; i < BB_PER_SLOT_INTS; i++, mask = 0) {
1553 if (!(bits = bb->bits[slot][i] & ~mask))
1555 /* The xor magic figures out the lowest enabled bit in
1556 * bits, and the switch quickly computes log2(bit). */
1557 switch (bits ^ (bits & (bits-1))) {
1558 #define LOG2(n) case 1u << n: return slot*BB_PER_SLOT_BITS + i*32 + n
1559 LOG2(0); LOG2(1); LOG2(2); LOG2(3);
1560 LOG2(4); LOG2(5); LOG2(6); LOG2(7);
1561 LOG2(8); LOG2(9); LOG2(10); LOG2(11);
1562 LOG2(12); LOG2(13); LOG2(14); LOG2(15);
1563 LOG2(16); LOG2(17); LOG2(18); LOG2(19);
1564 LOG2(20); LOG2(21); LOG2(22); LOG2(23);
1565 LOG2(24); LOG2(25); LOG2(26); LOG2(27);
1566 LOG2(28); LOG2(29); LOG2(30); LOG2(31);
1568 return -1; /* impossible... */
1575 void flist_ndx_push(flist_ndx_list *lp, int ndx)
1577 struct flist_ndx_item *item;
1579 if (!(item = new(struct flist_ndx_item)))
1580 out_of_memory("flist_ndx_push");
1584 lp->tail->next = item;
1590 int flist_ndx_pop(flist_ndx_list *lp)
1592 struct flist_ndx_item *next;
1598 ndx = lp->head->ndx;
1599 next = lp->head->next;
1608 void *expand_item_list(item_list *lp, size_t item_size,
1609 const char *desc, int incr)
1611 /* First time through, 0 <= 0, so list is expanded. */
1612 if (lp->malloced <= lp->count) {
1614 size_t new_size = lp->malloced;
1616 new_size += -incr; /* increase slowly */
1617 else if (new_size < (size_t)incr)
1621 if (new_size < lp->malloced)
1622 overflow_exit("expand_item_list");
1623 /* Using _realloc_array() lets us pass the size, not a type. */
1624 new_ptr = _realloc_array(lp->items, item_size, new_size);
1625 if (DEBUG_GTE(FLIST, 3)) {
1626 rprintf(FINFO, "[%s] expand %s to %s bytes, did%s move\n",
1627 who_am_i(), desc, big_num(new_size * item_size),
1628 new_ptr == lp->items ? " not" : "");
1631 out_of_memory("expand_item_list");
1633 lp->items = new_ptr;
1634 lp->malloced = new_size;
1636 return (char*)lp->items + (lp->count++ * item_size);