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) 2003-2008 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.
29 extern int modify_window;
30 extern int relative_paths;
31 extern int human_readable;
32 extern char *module_dir;
33 extern unsigned int module_dirlen;
34 extern mode_t orig_umask;
35 extern char *partial_dir;
36 extern struct filter_list_struct daemon_filter_list;
38 int sanitize_paths = 0;
40 char curr_dir[MAXPATHLEN];
41 unsigned int curr_dir_len;
42 int curr_dir_depth; /* This is only set for a sanitizing daemon. */
44 /* Set a fd into nonblocking mode. */
45 void set_nonblocking(int fd)
49 if ((val = fcntl(fd, F_GETFL)) == -1)
51 if (!(val & NONBLOCK_FLAG)) {
53 fcntl(fd, F_SETFL, val);
57 /* Set a fd into blocking mode. */
58 void set_blocking(int fd)
62 if ((val = fcntl(fd, F_GETFL)) == -1)
64 if (val & NONBLOCK_FLAG) {
65 val &= ~NONBLOCK_FLAG;
66 fcntl(fd, F_SETFL, val);
71 * Create a file descriptor pair - like pipe() but use socketpair if
72 * possible (because of blocking issues on pipes).
74 * Always set non-blocking.
76 int fd_pair(int fd[2])
80 #ifdef HAVE_SOCKETPAIR
81 ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
87 set_nonblocking(fd[0]);
88 set_nonblocking(fd[1]);
94 void print_child_argv(const char *prefix, char **cmd)
96 rprintf(FCLIENT, "%s ", prefix);
98 /* Look for characters that ought to be quoted. This
99 * is not a great quoting algorithm, but it's
100 * sufficient for a log message. */
101 if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz"
102 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
104 ",.-_=+@/") != strlen(*cmd)) {
105 rprintf(FCLIENT, "\"%s\" ", *cmd);
107 rprintf(FCLIENT, "%s ", *cmd);
110 rprintf(FCLIENT, "\n");
113 NORETURN void out_of_memory(const char *str)
115 rprintf(FERROR, "ERROR: out of memory in %s [%s]\n", str, who_am_i());
116 exit_cleanup(RERR_MALLOC);
119 NORETURN void overflow_exit(const char *str)
121 rprintf(FERROR, "ERROR: buffer overflow in %s [%s]\n", str, who_am_i());
122 exit_cleanup(RERR_MALLOC);
125 int set_modtime(const char *fname, time_t modtime, mode_t mode)
127 #if !defined HAVE_LUTIMES || !defined HAVE_UTIMES
133 rprintf(FINFO, "set modtime of %s to (%ld) %s",
134 fname, (long)modtime,
135 asctime(localtime(&modtime)));
144 t[0].tv_sec = time(NULL);
146 t[1].tv_sec = modtime;
150 if (lutimes(fname, t) < 0)
151 return errno == ENOSYS ? 1 : -1;
155 return utimes(fname, t);
156 #elif defined HAVE_STRUCT_UTIMBUF
158 tbuf.actime = time(NULL);
159 tbuf.modtime = modtime;
160 return utime(fname,&tbuf);
161 #elif defined HAVE_UTIME
165 return utime(fname,t);
167 #error No file-time-modification routine found!
172 /* This creates a new directory with default permissions. Since there
173 * might be some directory-default permissions affecting this, we can't
174 * force the permissions directly using the original umask and mkdir(). */
175 int mkdir_defmode(char *fname)
180 ret = do_mkdir(fname, ACCESSPERMS);
186 /* Create any necessary directories in fname. Any missing directories are
187 * created with default permissions. */
188 int create_directory_path(char *fname)
193 while (*fname == '/')
195 while (strncmp(fname, "./", 2) == 0)
200 while ((p = strchr(p,'/')) != NULL) {
202 if (do_mkdir(fname, ACCESSPERMS) < 0 && errno != EEXIST)
212 * Write @p len bytes at @p ptr to descriptor @p desc, retrying if
215 * @retval len upon success
217 * @retval <0 write's (negative) error code
219 * Derived from GNU C's cccp.c.
221 int full_write(int desc, const char *ptr, size_t len)
227 int written = write(desc, ptr, len);
233 total_written += written;
237 return total_written;
241 * Read @p len bytes at @p ptr from descriptor @p desc, retrying if
244 * @retval >0 the actual number of bytes read
248 * @retval <0 for an error.
250 * Derived from GNU C's cccp.c. */
251 static int safe_read(int desc, char *ptr, size_t len)
259 n_chars = read(desc, ptr, len);
260 } while (n_chars < 0 && errno == EINTR);
265 /* Copy a file. If ofd < 0, copy_file unlinks and opens the "dest" file.
266 * Otherwise, it just writes to and closes the provided file descriptor.
268 * This is used in conjunction with the --temp-dir, --backup, and
269 * --copy-dest options. */
270 int copy_file(const char *source, const char *dest, int ofd,
271 mode_t mode, int create_bak_dir)
275 int len; /* Number of bytes read into `buf'. */
277 if ((ifd = do_open(source, O_RDONLY, 0)) < 0) {
278 rsyserr(FERROR_XFER, errno, "open %s", full_fname(source));
283 if (robust_unlink(dest) && errno != ENOENT) {
284 rsyserr(FERROR_XFER, errno, "unlink %s", full_fname(dest));
288 if ((ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0
289 && (!create_bak_dir || errno != ENOENT || make_bak_dir(dest) < 0
290 || (ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0)) {
291 rsyserr(FERROR_XFER, errno, "open %s", full_fname(dest));
297 while ((len = safe_read(ifd, buf, sizeof buf)) > 0) {
298 if (full_write(ofd, buf, len) < 0) {
299 rsyserr(FERROR_XFER, errno, "write %s", full_fname(dest));
307 rsyserr(FERROR_XFER, errno, "read %s", full_fname(source));
313 if (close(ifd) < 0) {
314 rsyserr(FWARNING, errno, "close failed on %s",
318 if (close(ofd) < 0) {
319 rsyserr(FERROR_XFER, errno, "close failed on %s",
327 /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */
328 #define MAX_RENAMES_DIGITS 3
329 #define MAX_RENAMES 1000
332 * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so
333 * rename to <path>/.rsyncNNN instead.
335 * Note that successive rsync runs will shuffle the filenames around a
336 * bit as long as the file is still busy; this is because this function
337 * does not know if the unlink call is due to a new file coming in, or
338 * --delete trying to remove old .rsyncNNN files, hence it renames it
341 int robust_unlink(const char *fname)
344 return do_unlink(fname);
346 static int counter = 1;
348 char path[MAXPATHLEN];
350 rc = do_unlink(fname);
351 if (rc == 0 || errno != ETXTBSY)
354 if ((pos = strlcpy(path, fname, MAXPATHLEN)) >= MAXPATHLEN)
355 pos = MAXPATHLEN - 1;
357 while (pos > 0 && path[pos-1] != '/')
359 pos += strlcpy(path+pos, ".rsync", MAXPATHLEN-pos);
361 if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) {
366 /* start where the last one left off to reduce chance of clashes */
369 snprintf(&path[pos], MAX_RENAMES_DIGITS+1, "%03d", counter);
370 if (++counter >= MAX_RENAMES)
372 } while ((rc = access(path, 0)) == 0 && counter != start);
375 rprintf(FWARNING, "renaming %s to %s because of text busy\n",
379 /* maybe we should return rename()'s exit status? Nah. */
380 if (do_rename(fname, path) != 0) {
388 /* Returns 0 on successful rename, 1 if we successfully copied the file
389 * across filesystems, -2 if copy_file() failed, and -1 on other errors.
390 * If partialptr is not NULL and we need to do a copy, copy the file into
391 * the active partial-dir instead of over the destination file. */
392 int robust_rename(const char *from, const char *to, const char *partialptr,
398 if (do_rename(from, to) == 0)
404 if (robust_unlink(to) != 0)
410 if (!handle_partial_dir(partialptr,PDIR_CREATE))
414 if (copy_file(from, to, -1, mode, 0) != 0)
425 static pid_t all_pids[10];
428 /** Fork and record the pid of the child. **/
431 pid_t newpid = fork();
433 if (newpid != 0 && newpid != -1) {
434 all_pids[num_pids++] = newpid;
442 * @todo It would be kind of nice to make sure that they are actually
443 * all our children before we kill them, because their pids may have
444 * been recycled by some other process. Perhaps when we wait for a
445 * child, we should remove it from this array. Alternatively we could
446 * perhaps use process groups, but I think that would not work on
447 * ancient Unix versions that don't support them.
449 void kill_all(int sig)
453 for (i = 0; i < num_pids; i++) {
454 /* Let's just be a little careful where we
455 * point that gun, hey? See kill(2) for the
456 * magic caused by negative values. */
457 pid_t p = all_pids[i];
468 /** Turn a user name into a uid */
469 int name_to_uid(const char *name, uid_t *uid_p)
474 if (!(pass = getpwnam(name)))
476 *uid_p = pass->pw_uid;
480 /** Turn a group name into a gid */
481 int name_to_gid(const char *name, gid_t *gid_p)
486 if (!(grp = getgrnam(name)))
488 *gid_p = grp->gr_gid;
492 /** Lock a byte range in a open file */
493 int lock_range(int fd, int offset, int len)
497 lock.l_type = F_WRLCK;
498 lock.l_whence = SEEK_SET;
499 lock.l_start = offset;
503 return fcntl(fd,F_SETLK,&lock) == 0;
506 #define ENSURE_MEMSPACE(buf, type, sz, req) \
507 if ((req) >= sz && !(buf = realloc_array(buf, type, sz *= 2))) \
508 out_of_memory("ENSURE_MEMSPACE")
510 static inline void call_glob_match(const char *name, int len, int from_glob,
511 char *arg, int abpos, int fbpos);
513 static char *arg_buf, *filt_buf, **glob_argv;
514 static int absize, fbsize, glob_maxargs, glob_argc;
516 static void glob_match(char *arg, int abpos, int fbpos)
521 while (*arg == '.' && arg[1] == '/') {
524 filt_buf = realloc_array(filt_buf, char, fbsize = absize);
525 memcpy(filt_buf, arg_buf, abpos + 1);
528 ENSURE_MEMSPACE(arg_buf, char, absize, abpos + 2);
529 arg_buf[abpos++] = *arg++;
530 arg_buf[abpos++] = *arg++;
531 arg_buf[abpos] = '\0';
533 if ((slash = strchr(arg, '/')) != NULL) {
538 if (strpbrk(arg, "*?[")) {
542 if (!(d = opendir(abpos ? arg_buf : ".")))
544 while ((di = readdir(d)) != NULL) {
545 char *dname = d_name(di);
546 if (dname[0] == '.' && (dname[1] == '\0'
547 || (dname[1] == '.' && dname[2] == '\0')))
549 if (!wildmatch(arg, dname))
551 call_glob_match(dname, strlen(dname), 1,
552 slash ? arg + len + 1 : NULL,
557 call_glob_match(arg, len, 0,
558 slash ? arg + len + 1 : NULL,
565 static inline void call_glob_match(const char *name, int len, int from_glob,
566 char *arg, int abpos, int fbpos)
570 ENSURE_MEMSPACE(arg_buf, char, absize, abpos + len + 2);
571 memcpy(arg_buf + abpos, name, len);
573 arg_buf[abpos] = '\0';
576 ENSURE_MEMSPACE(filt_buf, char, fbsize, fbpos + len + 2);
577 memcpy(filt_buf + fbpos, name, len);
579 filt_buf[fbpos] = '\0';
584 if (from_glob || arg) {
588 if (do_stat(arg_buf, &st) != 0) {
593 is_dir = S_ISDIR(st.st_mode) != 0;
598 if (daemon_filter_list.head
599 && check_filter(&daemon_filter_list, use_buf, is_dir) < 0) {
607 arg_buf[abpos++] = '/';
608 arg_buf[abpos] = '\0';
610 filt_buf[fbpos++] = '/';
611 filt_buf[fbpos] = '\0';
613 glob_match(arg, abpos, fbpos);
615 ENSURE_MEMSPACE(glob_argv, char *, glob_maxargs, glob_argc + 1);
616 if (!(glob_argv[glob_argc++] = strdup(arg_buf)))
617 out_of_memory("glob_match");
621 /* This routine performs wild-card expansion of the pathname in "arg". Any
622 * daemon-excluded files/dirs will not be matched by the wildcards. */
623 void glob_expand(const char *arg, char ***argv_p, int *argc_p, int *maxargs_p)
626 int save_argc = *argc_p;
629 s = sanitize_path(NULL, arg, "", 0, SP_KEEP_DOT_DIRS);
633 out_of_memory("glob_expand");
634 clean_fname(s, CFN_KEEP_DOT_DIRS
635 | CFN_KEEP_TRAILING_SLASH
636 | CFN_COLLAPSE_DOT_DOT_DIRS);
639 if (!(arg_buf = new_array(char, absize = MAXPATHLEN)))
640 out_of_memory("glob_expand");
647 glob_maxargs = *maxargs_p;
649 if (glob_maxargs < MAX_ARGS
650 && !(glob_argv = realloc_array(glob_argv, char *, glob_maxargs = MAX_ARGS)))
651 out_of_memory("glob_expand");
653 glob_match(s, 0, -1);
655 /* The arg didn't match anything, so add the failed arg to the list. */
656 if (glob_argc == save_argc) {
657 ENSURE_MEMSPACE(glob_argv, char *, glob_maxargs, glob_argc + 1);
658 glob_argv[glob_argc++] = s;
662 *maxargs_p = glob_maxargs;
671 /* This routine is only used in daemon mode. */
672 void glob_expand_module(char *base1, char *arg, char ***argv_p, int *argc_p, int *maxargs_p)
676 int base_len = strlen(base);
681 if (strncmp(arg, base, base_len) == 0)
684 if (!(arg = strdup(arg)))
685 out_of_memory("glob_expand_module");
687 if (asprintf(&base," %s/", base1) <= 0)
688 out_of_memory("glob_expand_module");
691 for (s = arg; *s; s = p + base_len) {
692 if ((p = strstr(s, base)) != NULL)
693 *p = '\0'; /* split it at this point */
694 glob_expand(s, argv_p, argc_p, maxargs_p);
704 * Convert a string to lower case
706 void strlower(char *s)
715 /* Join strings p1 & p2 into "dest" with a guaranteed '/' between them. (If
716 * p1 ends with a '/', no extra '/' is inserted.) Returns the length of both
717 * strings + 1 (if '/' was inserted), regardless of whether the null-terminated
718 * string fits into destsize. */
719 size_t pathjoin(char *dest, size_t destsize, const char *p1, const char *p2)
721 size_t len = strlcpy(dest, p1, destsize);
722 if (len < destsize - 1) {
723 if (!len || dest[len-1] != '/')
725 if (len < destsize - 1)
726 len += strlcpy(dest + len, p2, destsize - len);
733 len += strlen(p2) + 1; /* Assume we'd insert a '/'. */
737 /* Join any number of strings together, putting them in "dest". The return
738 * value is the length of all the strings, regardless of whether the null-
739 * terminated whole fits in destsize. Your list of string pointers must end
740 * with a NULL to indicate the end of the list. */
741 size_t stringjoin(char *dest, size_t destsize, ...)
747 va_start(ap, destsize);
749 if (!(src = va_arg(ap, const char *)))
756 memcpy(dest, src, len);
767 int count_dir_elements(const char *p)
769 int cnt = 0, new_component = 1;
772 new_component = (*p != '.' || (p[1] != '/' && p[1] != '\0'));
773 else if (new_component) {
781 /* Turns multiple adjacent slashes into a single slash, drops all leading or
782 * interior "." elements unless CFN_KEEP_DOT_DIRS is flagged. Will also drop
783 * a trailing '.' after a '/' if CFN_DROP_TRAILING_DOT_DIR is flagged, removes
784 * a trailing slash (perhaps after removing the aforementioned dot) unless
785 * CFN_KEEP_TRAILING_SLASH is flagged, and will also collapse ".." elements
786 * (except at the start) if CFN_COLLAPSE_DOT_DOT_DIRS is flagged. If the
787 * resulting name would be empty, returns ".". */
788 unsigned int clean_fname(char *name, int flags)
790 char *limit = name - 1, *t = name, *f = name;
796 if ((anchored = *f == '/') != 0)
798 else if (flags & CFN_KEEP_DOT_DIRS && *f == '.' && f[1] == '/') {
803 /* discard extra slashes */
809 /* discard interior "." dirs */
810 if (f[1] == '/' && !(flags & CFN_KEEP_DOT_DIRS)) {
814 if (f[1] == '\0' && flags & CFN_DROP_TRAILING_DOT_DIR)
816 /* collapse ".." dirs */
817 if (flags & CFN_COLLAPSE_DOT_DOT_DIRS
818 && f[1] == '.' && (f[2] == '/' || !f[2])) {
820 if (s == name && anchored) {
824 while (s > limit && *--s != '/') {}
825 if (s != t - 1 && (s < name || *s == '/')) {
833 while (*f && (*t++ = *f++) != '/') {}
836 if (t > name+anchored && t[-1] == '/' && !(flags & CFN_KEEP_TRAILING_SLASH))
845 /* Make path appear as if a chroot had occurred. This handles a leading
846 * "/" (either removing it or expanding it) and any leading or embedded
847 * ".." components that attempt to escape past the module's top dir.
849 * If dest is NULL, a buffer is allocated to hold the result. It is legal
850 * to call with the dest and the path (p) pointing to the same buffer, but
851 * rootdir will be ignored to avoid expansion of the string.
853 * The rootdir string contains a value to use in place of a leading slash.
854 * Specify NULL to get the default of "module_dir".
856 * The depth var is a count of how many '..'s to allow at the start of the
859 * We also clean the path in a manner similar to clean_fname() but with a
862 * Turns multiple adjacent slashes into a single slash, gets rid of "." dir
863 * elements (INCLUDING a trailing dot dir), PRESERVES a trailing slash, and
864 * ALWAYS collapses ".." elements (except for those at the start of the
865 * string up to "depth" deep). If the resulting name would be empty,
866 * change it into a ".". */
867 char *sanitize_path(char *dest, const char *p, const char *rootdir, int depth,
871 int rlen = 0, drop_dot_dirs = !relative_paths || !(flags & SP_KEEP_DOT_DIRS);
874 int plen = strlen(p);
877 rootdir = module_dir;
878 rlen = strlen(rootdir);
883 if (rlen + plen + 1 >= MAXPATHLEN)
885 } else if (!(dest = new_array(char, rlen + plen + 1)))
886 out_of_memory("sanitize_path");
888 memcpy(dest, rootdir, rlen);
895 while (*p == '.' && p[1] == '/')
899 start = sanp = dest + rlen;
900 /* This loop iterates once per filename component in p, pointing at
901 * the start of the name (past any prior slash) for each iteration. */
903 /* discard leading or extra slashes */
909 if (*p == '.' && (p[1] == '/' || p[1] == '\0')) {
910 /* skip "." component */
915 if (*p == '.' && p[1] == '.' && (p[2] == '/' || p[2] == '\0')) {
916 /* ".." component followed by slash or end */
917 if (depth <= 0 || sanp != start) {
920 /* back up sanp one level */
921 --sanp; /* now pointing at slash */
922 while (sanp > start && sanp[-1] != '/')
927 /* allow depth levels of .. at the beginning */
929 /* move the virtual beginning to leave the .. alone */
932 /* copy one component through next slash */
933 while (*p && (*sanp++ = *p++) != '/') {}
936 /* ended up with nothing, so put in "." component */
944 /* Like chdir(), but it keeps track of the current directory (in the
945 * global "curr_dir"), and ensures that the path size doesn't overflow.
946 * Also cleans the path using the clean_fname() function. */
947 int push_dir(const char *dir, int set_path_only)
949 static int initialised;
954 getcwd(curr_dir, sizeof curr_dir - 1);
955 curr_dir_len = strlen(curr_dir);
958 if (!dir) /* this call was probably just to initialize */
962 if (len == 1 && *dir == '.')
965 if ((*dir == '/' ? len : curr_dir_len + 1 + len) >= sizeof curr_dir) {
966 errno = ENAMETOOLONG;
970 if (!set_path_only && chdir(dir))
974 memcpy(curr_dir, dir, len + 1);
977 curr_dir[curr_dir_len++] = '/';
978 memcpy(curr_dir + curr_dir_len, dir, len + 1);
982 curr_dir_len = clean_fname(curr_dir, CFN_COLLAPSE_DOT_DOT_DIRS);
983 if (sanitize_paths) {
984 if (module_dirlen > curr_dir_len)
985 module_dirlen = curr_dir_len;
986 curr_dir_depth = count_dir_elements(curr_dir + module_dirlen);
989 if (verbose >= 5 && !set_path_only)
990 rprintf(FINFO, "[%s] push_dir(%s)\n", who_am_i(), curr_dir);
996 * Reverse a push_dir() call. You must pass in an absolute path
997 * that was copied from a prior value of "curr_dir".
999 int pop_dir(const char *dir)
1004 curr_dir_len = strlcpy(curr_dir, dir, sizeof curr_dir);
1005 if (curr_dir_len >= sizeof curr_dir)
1006 curr_dir_len = sizeof curr_dir - 1;
1008 curr_dir_depth = count_dir_elements(curr_dir + module_dirlen);
1011 rprintf(FINFO, "[%s] pop_dir(%s)\n", who_am_i(), curr_dir);
1017 * Return a quoted string with the full pathname of the indicated filename.
1018 * The string " (in MODNAME)" may also be appended. The returned pointer
1019 * remains valid until the next time full_fname() is called.
1021 char *full_fname(const char *fn)
1023 static char *result = NULL;
1033 p1 = curr_dir + module_dirlen;
1034 for (p2 = p1; *p2 == '/'; p2++) {}
1038 if (module_id >= 0) {
1040 m2 = lp_name(module_id);
1045 if (asprintf(&result, "\"%s%s%s\"%s%s%s", p1, p2, fn, m1, m2, m3) <= 0)
1046 out_of_memory("full_fname");
1051 static char partial_fname[MAXPATHLEN];
1053 char *partial_dir_fname(const char *fname)
1055 char *t = partial_fname;
1056 int sz = sizeof partial_fname;
1059 if ((fn = strrchr(fname, '/')) != NULL) {
1061 if (*partial_dir != '/') {
1062 int len = fn - fname;
1063 strncpy(t, fname, len); /* safe */
1069 if ((int)pathjoin(t, sz, partial_dir, fn) >= sz)
1071 if (daemon_filter_list.head) {
1072 t = strrchr(partial_fname, '/');
1074 if (check_filter(&daemon_filter_list, partial_fname, 1) < 0)
1077 if (check_filter(&daemon_filter_list, partial_fname, 0) < 0)
1081 return partial_fname;
1084 /* If no --partial-dir option was specified, we don't need to do anything
1085 * (the partial-dir is essentially '.'), so just return success. */
1086 int handle_partial_dir(const char *fname, int create)
1090 if (fname != partial_fname)
1092 if (!create && *partial_dir == '/')
1094 if (!(fn = strrchr(partial_fname, '/')))
1098 dir = partial_fname;
1101 int statret = do_lstat(dir, &st);
1102 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1103 if (do_unlink(dir) < 0)
1107 if (statret < 0 && do_mkdir(dir, 0700) < 0)
1117 * Determine if a symlink points outside the current directory tree.
1118 * This is considered "unsafe" because e.g. when mirroring somebody
1119 * else's machine it might allow them to establish a symlink to
1120 * /etc/passwd, and then read it through a web server.
1122 * Null symlinks and absolute symlinks are always unsafe.
1124 * Basically here we are concerned with symlinks whose target contains
1125 * "..", because this might cause us to walk back up out of the
1126 * transferred directory. We are not allowed to go back up and
1129 * @param dest Target of the symlink in question.
1131 * @param src Top source directory currently applicable. Basically this
1132 * is the first parameter to rsync in a simple invocation, but it's
1133 * modified by flist.c in slightly complex ways.
1135 * @retval True if unsafe
1136 * @retval False is unsafe
1140 int unsafe_symlink(const char *dest, const char *src)
1142 const char *name, *slash;
1145 /* all absolute and null symlinks are unsafe */
1146 if (!dest || !*dest || *dest == '/')
1149 /* find out what our safety margin is */
1150 for (name = src; (slash = strchr(name, '/')) != 0; name = slash+1) {
1151 if (strncmp(name, "../", 3) == 0) {
1153 } else if (strncmp(name, "./", 2) == 0) {
1159 if (strcmp(name, "..") == 0)
1162 for (name = dest; (slash = strchr(name, '/')) != 0; name = slash+1) {
1163 if (strncmp(name, "../", 3) == 0) {
1164 /* if at any point we go outside the current directory
1165 then stop - it is unsafe */
1168 } else if (strncmp(name, "./", 2) == 0) {
1174 if (strcmp(name, "..") == 0)
1180 /* Return the int64 number as a string. If the --human-readable option was
1181 * specified, we may output the number in K, M, or G units. We can return
1182 * up to 4 buffers at a time. */
1183 char *human_num(int64 num)
1185 static char bufs[4][128]; /* more than enough room */
1186 static unsigned int n;
1189 n = (n + 1) % (sizeof bufs / sizeof bufs[0]);
1191 if (human_readable) {
1193 int mult = human_readable == 1 ? 1000 : 1024;
1195 if (num > mult*mult*mult) {
1196 dnum = (double)num / (mult*mult*mult);
1198 } else if (num > mult*mult) {
1199 dnum = (double)num / (mult*mult);
1201 } else if (num > mult) {
1202 dnum = (double)num / mult;
1206 snprintf(bufs[n], sizeof bufs[0], "%.2f%c", dnum, units);
1211 s = bufs[n] + sizeof bufs[0] - 1;
1217 *--s = (char)(num % 10) + '0';
1223 /* Return the double number as a string. If the --human-readable option was
1224 * specified, we may output the number in K, M, or G units. We use a buffer
1225 * from human_num() to return our result. */
1226 char *human_dnum(double dnum, int decimal_digits)
1228 char *buf = human_num(dnum);
1229 int len = strlen(buf);
1230 if (isDigit(buf + len - 1)) {
1231 /* There's extra room in buf prior to the start of the num. */
1232 buf -= decimal_digits + 1;
1233 snprintf(buf, len + decimal_digits + 2, "%.*f", decimal_digits, dnum);
1238 /* Return the date and time as a string. Some callers tweak returned buf. */
1239 char *timestring(time_t t)
1241 static char TimeBuf[200];
1242 struct tm *tm = localtime(&t);
1245 #ifdef HAVE_STRFTIME
1246 strftime(TimeBuf, sizeof TimeBuf - 1, "%Y/%m/%d %H:%M:%S", tm);
1248 strlcpy(TimeBuf, asctime(tm), sizeof TimeBuf);
1251 if ((p = strchr(TimeBuf, '\n')) != NULL)
1258 * Sleep for a specified number of milliseconds.
1260 * Always returns TRUE. (In the future it might return FALSE if
1266 struct timeval tval, t1, t2;
1268 gettimeofday(&t1, NULL);
1271 tval.tv_sec = (t-tdiff)/1000;
1272 tval.tv_usec = 1000*((t-tdiff)%1000);
1275 select(0,NULL,NULL, NULL, &tval);
1277 gettimeofday(&t2, NULL);
1278 tdiff = (t2.tv_sec - t1.tv_sec)*1000 +
1279 (t2.tv_usec - t1.tv_usec)/1000;
1285 /* Determine if two time_t values are equivalent (either exact, or in
1286 * the modification timestamp window established by --modify-window).
1288 * @retval 0 if the times should be treated as the same
1290 * @retval +1 if the first is later
1292 * @retval -1 if the 2nd is later
1294 int cmp_time(time_t file1, time_t file2)
1296 if (file2 > file1) {
1297 if (file2 - file1 <= modify_window)
1301 if (file1 - file2 <= modify_window)
1311 This routine is a trick to immediately catch errors when debugging
1312 with insure. A xterm with a gdb is popped up when insure catches
1313 a error. It is Linux specific.
1315 int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6)
1321 asprintf(&cmd, "/usr/X11R6/bin/xterm -display :0 -T Panic -n Panic -e /bin/sh -c 'cat /tmp/ierrs.*.%d ; gdb /proc/%d/exe %d'",
1322 getpid(), getpid(), getpid());
1326 h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY);
1327 fn = dlsym(h, "_Insure_trap_error");
1330 ret = fn(a1, a2, a3, a4, a5, a6);
1340 #define MALLOC_MAX 0x40000000
1342 void *_new_array(unsigned long num, unsigned int size, int use_calloc)
1344 if (num >= MALLOC_MAX/size)
1346 return use_calloc ? calloc(num, size) : malloc(num * size);
1349 void *_realloc_array(void *ptr, unsigned int size, unsigned long num)
1351 if (num >= MALLOC_MAX/size)
1354 return malloc(size * num);
1355 return realloc(ptr, size * num);
1358 /* Take a filename and filename length and return the most significant
1359 * filename suffix we can find. This ignores suffixes such as "~",
1360 * ".bak", ".orig", ".~1~", etc. */
1361 const char *find_filename_suffix(const char *fn, int fn_len, int *len_ptr)
1363 const char *suf, *s;
1367 /* One or more dots at the start aren't a suffix. */
1368 while (fn_len && *fn == '.') fn++, fn_len--;
1370 /* Ignore the ~ in a "foo~" filename. */
1371 if (fn_len > 1 && fn[fn_len-1] == '~')
1372 fn_len--, had_tilde = True;
1376 /* Assume we don't find an suffix. */
1380 /* Find the last significant suffix. */
1381 for (s = fn + fn_len; fn_len > 1; ) {
1382 while (*--s != '.' && s != fn) {}
1385 s_len = fn_len - (s - fn);
1388 if (strcmp(s+1, "bak") == 0
1389 || strcmp(s+1, "old") == 0)
1391 } else if (s_len == 5) {
1392 if (strcmp(s+1, "orig") == 0)
1394 } else if (s_len > 2 && had_tilde
1395 && s[1] == '~' && isDigit(s + 2))
1401 /* Determine if the suffix is all digits. */
1402 for (s++, s_len--; s_len > 0; s++, s_len--) {
1406 /* An all-digit suffix may not be that signficant. */
1413 /* This is an implementation of the Levenshtein distance algorithm. It
1414 * was implemented to avoid needing a two-dimensional matrix (to save
1415 * memory). It was also tweaked to try to factor in the ASCII distance
1416 * between changed characters as a minor distance quantity. The normal
1417 * Levenshtein units of distance (each signifying a single change between
1418 * the two strings) are defined as a "UNIT". */
1420 #define UNIT (1 << 16)
1422 uint32 fuzzy_distance(const char *s1, int len1, const char *s2, int len2)
1424 uint32 a[MAXPATHLEN], diag, above, left, diag_inc, above_inc, left_inc;
1428 if (!len1 || !len2) {
1433 for (i1 = 0, cost = 0; i1 < len1; i1++)
1435 return (int32)len1 * UNIT + cost;
1438 for (i2 = 0; i2 < len2; i2++)
1439 a[i2] = (i2+1) * UNIT;
1441 for (i1 = 0; i1 < len1; i1++) {
1443 above = (i1+1) * UNIT;
1444 for (i2 = 0; i2 < len2; i2++) {
1446 if ((cost = *((uchar*)s1+i1) - *((uchar*)s2+i2)) != 0) {
1452 diag_inc = diag + cost;
1453 left_inc = left + UNIT + *((uchar*)s1+i1);
1454 above_inc = above + UNIT + *((uchar*)s2+i2);
1455 a[i2] = above = left < above
1456 ? (left_inc < diag_inc ? left_inc : diag_inc)
1457 : (above_inc < diag_inc ? above_inc : diag_inc);
1465 #define BB_SLOT_SIZE (16*1024) /* Desired size in bytes */
1466 #define BB_PER_SLOT_BITS (BB_SLOT_SIZE * 8) /* Number of bits per slot */
1467 #define BB_PER_SLOT_INTS (BB_SLOT_SIZE / 4) /* Number of int32s per slot */
1474 struct bitbag *bitbag_create(int max_ndx)
1476 struct bitbag *bb = new(struct bitbag);
1477 bb->slot_cnt = (max_ndx + BB_PER_SLOT_BITS - 1) / BB_PER_SLOT_BITS;
1479 if (!(bb->bits = (uint32**)calloc(bb->slot_cnt, sizeof (uint32*))))
1480 out_of_memory("bitbag_create");
1485 void bitbag_set_bit(struct bitbag *bb, int ndx)
1487 int slot = ndx / BB_PER_SLOT_BITS;
1488 ndx %= BB_PER_SLOT_BITS;
1490 if (!bb->bits[slot]) {
1491 if (!(bb->bits[slot] = (uint32*)calloc(BB_PER_SLOT_INTS, 4)))
1492 out_of_memory("bitbag_set_bit");
1495 bb->bits[slot][ndx/32] |= 1u << (ndx % 32);
1498 #if 0 /* not needed yet */
1499 void bitbag_clear_bit(struct bitbag *bb, int ndx)
1501 int slot = ndx / BB_PER_SLOT_BITS;
1502 ndx %= BB_PER_SLOT_BITS;
1504 if (!bb->bits[slot])
1507 bb->bits[slot][ndx/32] &= ~(1u << (ndx % 32));
1510 int bitbag_check_bit(struct bitbag *bb, int ndx)
1512 int slot = ndx / BB_PER_SLOT_BITS;
1513 ndx %= BB_PER_SLOT_BITS;
1515 if (!bb->bits[slot])
1518 return bb->bits[slot][ndx/32] & (1u << (ndx % 32)) ? 1 : 0;
1522 /* Call this with -1 to start checking from 0. Returns -1 at the end. */
1523 int bitbag_next_bit(struct bitbag *bb, int after)
1526 int i, ndx = after + 1;
1527 int slot = ndx / BB_PER_SLOT_BITS;
1528 ndx %= BB_PER_SLOT_BITS;
1530 mask = (1u << (ndx % 32)) - 1;
1531 for (i = ndx / 32; slot < bb->slot_cnt; slot++, i = mask = 0) {
1532 if (!bb->bits[slot])
1534 for ( ; i < BB_PER_SLOT_INTS; i++, mask = 0) {
1535 if (!(bits = bb->bits[slot][i] & ~mask))
1537 /* The xor magic figures out the lowest enabled bit in
1538 * bits, and the switch quickly computes log2(bit). */
1539 switch (bits ^ (bits & (bits-1))) {
1540 #define LOG2(n) case 1u << n: return slot*BB_PER_SLOT_BITS + i*32 + n
1541 LOG2(0); LOG2(1); LOG2(2); LOG2(3);
1542 LOG2(4); LOG2(5); LOG2(6); LOG2(7);
1543 LOG2(8); LOG2(9); LOG2(10); LOG2(11);
1544 LOG2(12); LOG2(13); LOG2(14); LOG2(15);
1545 LOG2(16); LOG2(17); LOG2(18); LOG2(19);
1546 LOG2(20); LOG2(21); LOG2(22); LOG2(23);
1547 LOG2(24); LOG2(25); LOG2(26); LOG2(27);
1548 LOG2(28); LOG2(29); LOG2(30); LOG2(31);
1550 return -1; /* impossible... */
1557 void *expand_item_list(item_list *lp, size_t item_size,
1558 const char *desc, int incr)
1560 /* First time through, 0 <= 0, so list is expanded. */
1561 if (lp->malloced <= lp->count) {
1563 size_t new_size = lp->malloced;
1565 new_size += -incr; /* increase slowly */
1566 else if (new_size < (size_t)incr)
1570 new_ptr = realloc_array(lp->items, char, new_size * item_size);
1572 rprintf(FINFO, "[%s] expand %s to %.0f bytes, did%s move\n",
1573 who_am_i(), desc, (double)new_size * item_size,
1574 new_ptr == lp->items ? " not" : "");
1577 out_of_memory("expand_item_list");
1579 lp->items = new_ptr;
1580 lp->malloced = new_size;
1582 return (char*)lp->items + (lp->count++ * item_size);