1 /* -*- c-file-style: "linux" -*-
3 * Copyright (C) 1996-2000 by Andrew Tridgell
4 * Copyright (C) Paul Mackerras 1996
5 * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 * Utilities used in rsync
31 extern struct exclude_list_struct server_exclude_list;
33 int sanitize_paths = 0;
38 * Set a fd into nonblocking mode
40 void set_nonblocking(int fd)
44 if ((val = fcntl(fd, F_GETFL, 0)) == -1)
46 if (!(val & NONBLOCK_FLAG)) {
48 fcntl(fd, F_SETFL, val);
53 * Set a fd into blocking mode
55 void set_blocking(int fd)
59 if ((val = fcntl(fd, F_GETFL, 0)) == -1)
61 if (val & NONBLOCK_FLAG) {
62 val &= ~NONBLOCK_FLAG;
63 fcntl(fd, F_SETFL, val);
69 * Create a file descriptor pair - like pipe() but use socketpair if
70 * possible (because of blocking issues on pipes).
72 * Always set non-blocking.
74 int fd_pair(int fd[2])
79 ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
85 set_nonblocking(fd[0]);
86 set_nonblocking(fd[1]);
93 void print_child_argv(char **cmd)
95 rprintf(FINFO, "opening connection using ");
97 /* Look for characters that ought to be quoted. This
98 * is not a great quoting algorithm, but it's
99 * sufficient for a log message. */
100 if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz"
101 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
103 ",.-_=+@/") != strlen(*cmd)) {
104 rprintf(FINFO, "\"%s\" ", *cmd);
106 rprintf(FINFO, "%s ", *cmd);
109 rprintf(FINFO, "\n");
113 void out_of_memory(char *str)
115 rprintf(FERROR, "ERROR: out of memory in %s\n", str);
116 exit_cleanup(RERR_MALLOC);
119 void overflow(char *str)
121 rprintf(FERROR, "ERROR: buffer overflow in %s\n", str);
122 exit_cleanup(RERR_MALLOC);
127 int set_modtime(char *fname, time_t modtime)
134 rprintf(FINFO, "set modtime of %s to (%ld) %s",
135 fname, (long) modtime,
136 asctime(localtime(&modtime)));
142 tbuf.actime = time(NULL);
143 tbuf.modtime = modtime;
144 return utime(fname,&tbuf);
145 #elif defined(HAVE_UTIME)
149 return utime(fname,t);
152 t[0].tv_sec = time(NULL);
154 t[1].tv_sec = modtime;
156 return utimes(fname,t);
163 Create any necessary directories in fname. Unfortunately we don't know
164 what perms to give the directory when this is called so we need to rely
167 int create_directory_path(char *fname, int base_umask)
171 while (*fname == '/')
173 while (strncmp(fname, "./", 2) == 0)
177 while ((p = strchr(p,'/')) != NULL) {
179 do_mkdir(fname, 0777 & ~base_umask);
188 * Write @p len bytes at @p ptr to descriptor @p desc, retrying if
191 * @retval len upon success
193 * @retval <0 write's (negative) error code
195 * Derived from GNU C's cccp.c.
197 static int full_write(int desc, char *ptr, size_t len)
203 int written = write(desc, ptr, len);
209 total_written += written;
213 return total_written;
218 * Read @p len bytes at @p ptr from descriptor @p desc, retrying if
221 * @retval >0 the actual number of bytes read
225 * @retval <0 for an error.
227 * Derived from GNU C's cccp.c. */
228 static int safe_read(int desc, char *ptr, size_t len)
236 n_chars = read(desc, ptr, len);
237 } while (n_chars < 0 && errno == EINTR);
245 * This is used in conjunction with the --temp-dir option */
246 int copy_file(char *source, char *dest, mode_t mode)
251 int len; /* Number of bytes read into `buf'. */
253 ifd = do_open(source, O_RDONLY, 0);
255 rprintf(FERROR,"open %s: %s\n",
256 full_fname(source), strerror(errno));
260 if (robust_unlink(dest) && errno != ENOENT) {
261 rprintf(FERROR,"unlink %s: %s\n",
262 full_fname(dest), strerror(errno));
266 ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode);
268 rprintf(FERROR,"open %s: %s\n",
269 full_fname(dest), strerror(errno));
274 while ((len = safe_read(ifd, buf, sizeof buf)) > 0) {
275 if (full_write(ofd, buf, len) < 0) {
276 rprintf(FERROR,"write %s: %s\n",
277 full_fname(dest), strerror(errno));
285 rprintf(FERROR, "read %s: %s\n",
286 full_fname(source), strerror(errno));
292 if (close(ifd) < 0) {
293 rprintf(FINFO, "close failed on %s: %s\n",
294 full_fname(source), strerror(errno));
297 if (close(ofd) < 0) {
298 rprintf(FERROR, "close failed on %s: %s\n",
299 full_fname(dest), strerror(errno));
306 /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */
307 #define MAX_RENAMES_DIGITS 3
308 #define MAX_RENAMES 1000
311 * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so
312 * rename to <path>/.rsyncNNN instead.
314 * Note that successive rsync runs will shuffle the filenames around a
315 * bit as long as the file is still busy; this is because this function
316 * does not know if the unlink call is due to a new file coming in, or
317 * --delete trying to remove old .rsyncNNN files, hence it renames it
320 int robust_unlink(char *fname)
323 return do_unlink(fname);
325 static int counter = 1;
327 char path[MAXPATHLEN];
329 rc = do_unlink(fname);
330 if (rc == 0 || errno != ETXTBSY)
333 if ((pos = strlcpy(path, fname, MAXPATHLEN)) >= MAXPATHLEN)
334 pos = MAXPATHLEN - 1;
336 while (pos > 0 && path[pos-1] != '/')
338 pos += strlcpy(path+pos, ".rsync", MAXPATHLEN-pos);
340 if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) {
345 /* start where the last one left off to reduce chance of clashes */
348 sprintf(&path[pos], "%03d", counter);
349 if (++counter >= MAX_RENAMES)
351 } while ((rc = access(path, 0)) == 0 && counter != start);
354 rprintf(FINFO,"renaming %s to %s because of text busy\n",
358 /* maybe we should return rename()'s exit status? Nah. */
359 if (do_rename(fname, path) != 0) {
367 /* Returns 0 on success, -1 on most errors, and -2 if we got an error
368 * trying to copy the file across file systems. */
369 int robust_rename(char *from, char *to, int mode)
374 if (do_rename(from, to) == 0)
380 if (robust_unlink(to) != 0)
385 if (copy_file(from, to, mode) != 0)
397 static pid_t all_pids[10];
400 /** Fork and record the pid of the child. **/
403 pid_t newpid = fork();
405 if (newpid != 0 && newpid != -1) {
406 all_pids[num_pids++] = newpid;
414 * @todo It would be kind of nice to make sure that they are actually
415 * all our children before we kill them, because their pids may have
416 * been recycled by some other process. Perhaps when we wait for a
417 * child, we should remove it from this array. Alternatively we could
418 * perhaps use process groups, but I think that would not work on
419 * ancient Unix versions that don't support them.
421 void kill_all(int sig)
425 for (i = 0; i < num_pids; i++) {
426 /* Let's just be a little careful where we
427 * point that gun, hey? See kill(2) for the
428 * magic caused by negative values. */
429 pid_t p = all_pids[i];
441 /** Turn a user name into a uid */
442 int name_to_uid(char *name, uid_t *uid)
445 if (!name || !*name) return 0;
446 pass = getpwnam(name);
454 /** Turn a group name into a gid */
455 int name_to_gid(char *name, gid_t *gid)
458 if (!name || !*name) return 0;
459 grp = getgrnam(name);
468 /** Lock a byte range in a open file */
469 int lock_range(int fd, int offset, int len)
473 lock.l_type = F_WRLCK;
474 lock.l_whence = SEEK_SET;
475 lock.l_start = offset;
479 return fcntl(fd,F_SETLK,&lock) == 0;
482 static int exclude_server_path(char *arg)
486 if (server_exclude_list.head) {
487 for (s = arg; (s = strchr(s, '/')) != NULL; ) {
489 if (check_exclude(&server_exclude_list, arg, 1) < 0) {
490 /* We must leave arg truncated! */
499 static void glob_expand_one(char *s, char **argv, int *argc, int maxargs)
501 #if !(defined(HAVE_GLOB) && defined(HAVE_GLOB_H))
503 s = argv[*argc] = strdup(s);
504 exclude_server_path(s);
507 extern int sanitize_paths;
513 s = argv[*argc] = strdup(s);
514 if (sanitize_paths) {
515 sanitize_path(s, NULL);
518 memset(&globbuf, 0, sizeof globbuf);
519 if (!exclude_server_path(s))
520 glob(s, 0, NULL, &globbuf);
521 if (globbuf.gl_pathc == 0) {
526 for (i = 0; i < maxargs - *argc && i < (int)globbuf.gl_pathc; i++) {
529 argv[*argc + i] = strdup(globbuf.gl_pathv[i]);
530 if (!argv[*argc + i])
531 out_of_memory("glob_expand");
538 /* This routine is only used in daemon mode. */
539 void glob_expand(char *base1, char **argv, int *argc, int maxargs)
541 char *s = argv[*argc];
544 int base_len = strlen(base);
546 if (!s || !*s) return;
548 if (strncmp(s, base, base_len) == 0)
552 if (!s) out_of_memory("glob_expand");
554 if (asprintf(&base," %s/", base1) <= 0) out_of_memory("glob_expand");
558 while ((p = strstr(q,base)) != NULL && *argc < maxargs) {
559 /* split it at this point */
561 glob_expand_one(q, argv, argc, maxargs);
565 if (*q && *argc < maxargs)
566 glob_expand_one(q, argv, argc, maxargs);
573 * Convert a string to lower case
575 void strlower(char *s)
578 if (isupper(* (unsigned char *) s))
579 *s = tolower(* (unsigned char *) s);
584 /* Join strings p1 & p2 into "dest" with a guaranteed '/' between them. (If
585 * p1 ends with a '/', no extra '/' is inserted.) Returns the length of both
586 * strings + 1 (if '/' was inserted), regardless of whether the null-terminated
587 * string fits into destsize. */
588 size_t pathjoin(char *dest, size_t destsize, const char *p1, const char *p2)
590 size_t len = strlcpy(dest, p1, destsize);
591 if (len < destsize - 1) {
592 if (!len || dest[len-1] != '/')
594 if (len < destsize - 1)
595 len += strlcpy(dest + len, p2, destsize - len);
602 len += strlen(p2) + 1; /* Assume we'd insert a '/'. */
606 /* Join any number of strings together, putting them in "dest". The return
607 * value is the length of all the strings, regardless of whether the null-
608 * terminated whole fits in destsize. Your list of string pointers must end
609 * with a NULL to indicate the end of the list. */
610 size_t stringjoin(char *dest, size_t destsize, ...)
616 va_start(ap, destsize);
618 if (!(src = va_arg(ap, const char *)))
625 memcpy(dest, src, len);
636 void clean_fname(char *name)
647 if ((p = strstr(name,"/./")) != NULL) {
655 if ((p = strstr(name,"//")) != NULL) {
663 if (strncmp(p = name, "./", 2) == 0) {
670 l = strlen(p = name);
671 if (l > 1 && p[l-1] == '/') {
679 * Make path appear as if a chroot had occurred:
681 * @li 1. remove leading "/" (or replace with "." if at end)
683 * @li 2. remove leading ".." components (except those allowed by @p reldir)
685 * @li 3. delete any other "<dir>/.." (recursively)
687 * Can only shrink paths, so sanitizes in place.
689 * While we're at it, remove double slashes and "." components like
690 * clean_fname() does, but DON'T remove a trailing slash because that
691 * is sometimes significant on command line arguments.
693 * If @p reldir is non-null, it is a sanitized directory that the path will be
694 * relative to, so allow as many ".." at the beginning of the path as
695 * there are components in reldir. This is used for symbolic link targets.
696 * If reldir is non-null and the path began with "/", to be completely like
697 * a chroot we should add in depth levels of ".." at the beginning of the
698 * path, but that would blow the assumption that the path doesn't grow and
699 * it is not likely to end up being a valid symlink anyway, so just do
700 * the normal removal of the leading "/" instead.
702 * Contributed by Dave Dykstra <dwd@bell-labs.com>
704 void sanitize_path(char *p, char *reldir)
713 if (*reldir++ == '/') {
721 /* remove leading slashes */
725 /* this loop iterates once per filename component in p.
726 * both p (and sanp if the original had a slash) should
727 * always be left pointing after a slash
729 if (*p == '.' && (p[1] == '/' || p[1] == '\0')) {
730 /* skip "." component */
731 while (*++p == '/') {
732 /* skip following slashes */
738 if (*p == '.' && p[1] == '.' && (p[2] == '/' || p[2] == '\0')) {
739 /* ".." component followed by slash or end */
740 if (depth > 0 && sanp == start) {
741 /* allow depth levels of .. at the beginning */
749 /* back up sanp one level */
750 --sanp; /* now pointing at slash */
751 while (sanp > start && sanp[-1] != '/') {
752 /* skip back up to slash */
760 /* copy one component through next slash */
762 if (*p == '\0' || p[-1] == '/') {
764 /* skip multiple slashes */
771 /* move the virtual beginning to leave the .. alone */
775 if (sanp == start && !allowdotdot) {
776 /* ended up with nothing, so put in "." component */
778 * note that the !allowdotdot doesn't prevent this from
779 * happening in all allowed ".." situations, but I didn't
780 * think it was worth putting in an extra variable to ensure
781 * it since an extra "." won't hurt in those situations.
788 /* Works much like sanitize_path(), with these differences: (1) a new buffer
789 * is allocated for the sanitized path rather than modifying it in-place; (2)
790 * a leading slash gets transformed into the rootdir value (which can be empty
791 * or NULL if you just want the slash to get dropped); (3) no "reldir" can be
793 char *alloc_sanitize_path(const char *path, const char *rootdir)
796 int rlen, plen = strlen(path);
798 if (*path == '/' && rootdir) {
799 rlen = strlen(rootdir);
804 if (!(buf = new_array(char, rlen + plen + 1)))
805 out_of_memory("alloc_sanitize_path");
807 memcpy(buf, rootdir, rlen);
808 memcpy(buf + rlen, path, plen + 1);
812 sanitize_path(buf + rlen, NULL);
813 if (rlen && buf[rlen] == '.' && buf[rlen+1] == '\0') {
822 char curr_dir[MAXPATHLEN];
823 unsigned int curr_dir_len;
826 * Like chdir(), but it keeps track of the current directory (in the
827 * global "curr_dir"), and ensures that the path size doesn't overflow.
828 * Also cleans the path using the clean_fname() function.
830 int push_dir(char *dir)
832 static int initialised;
837 getcwd(curr_dir, sizeof curr_dir - 1);
838 curr_dir_len = strlen(curr_dir);
841 if (!dir) /* this call was probably just to initialize */
845 if (len == 1 && *dir == '.')
848 if ((*dir == '/' ? len : curr_dir_len + 1 + len) >= sizeof curr_dir)
855 memcpy(curr_dir, dir, len + 1);
858 curr_dir[curr_dir_len++] = '/';
859 memcpy(curr_dir + curr_dir_len, dir, len + 1);
863 clean_fname(curr_dir);
869 * Reverse a push_dir() call. You must pass in an absolute path
870 * that was copied from a prior value of "curr_dir".
872 int pop_dir(char *dir)
877 curr_dir_len = strlcpy(curr_dir, dir, sizeof curr_dir);
878 if (curr_dir_len >= sizeof curr_dir)
879 curr_dir_len = sizeof curr_dir - 1;
885 * Return a quoted string with the full pathname of the indicated filename.
886 * The string " (in MODNAME)" may also be appended. The returned pointer
887 * remains valid until the next time full_fname() is called.
889 char *full_fname(char *fn)
891 extern int module_id;
892 static char *result = NULL;
905 if (module_id >= 0) {
907 m2 = lp_name(module_id);
910 if (!lp_use_chroot(module_id)) {
911 char *p = lp_path(module_id);
912 if (*p != '/' || p[1])
925 asprintf(&result, "\"%s%s%s\"%s%s%s", p1, p2, fn, m1, m2, m3);
930 /** We need to supply our own strcmp function for file list comparisons
931 to ensure that signed/unsigned usage is consistent between machines. */
932 int u_strcmp(const char *cs1, const char *cs2)
934 const uchar *s1 = (const uchar *)cs1;
935 const uchar *s2 = (const uchar *)cs2;
937 while (*s1 && *s2 && (*s1 == *s2)) {
941 return (int)*s1 - (int)*s2;
947 * Determine if a symlink points outside the current directory tree.
948 * This is considered "unsafe" because e.g. when mirroring somebody
949 * else's machine it might allow them to establish a symlink to
950 * /etc/passwd, and then read it through a web server.
952 * Null symlinks and absolute symlinks are always unsafe.
954 * Basically here we are concerned with symlinks whose target contains
955 * "..", because this might cause us to walk back up out of the
956 * transferred directory. We are not allowed to go back up and
959 * @param dest Target of the symlink in question.
961 * @param src Top source directory currently applicable. Basically this
962 * is the first parameter to rsync in a simple invocation, but it's
963 * modified by flist.c in slightly complex ways.
965 * @retval True if unsafe
966 * @retval False is unsafe
970 int unsafe_symlink(const char *dest, const char *src)
972 const char *name, *slash;
975 /* all absolute and null symlinks are unsafe */
976 if (!dest || !*dest || *dest == '/') return 1;
978 /* find out what our safety margin is */
979 for (name = src; (slash = strchr(name, '/')) != 0; name = slash+1) {
980 if (strncmp(name, "../", 3) == 0) {
982 } else if (strncmp(name, "./", 2) == 0) {
988 if (strcmp(name, "..") == 0)
991 for (name = dest; (slash = strchr(name, '/')) != 0; name = slash+1) {
992 if (strncmp(name, "../", 3) == 0) {
993 /* if at any point we go outside the current directory
994 then stop - it is unsafe */
997 } else if (strncmp(name, "./", 2) == 0) {
1003 if (strcmp(name, "..") == 0)
1011 * Return the date and time as a string
1013 char *timestring(time_t t)
1015 static char TimeBuf[200];
1016 struct tm *tm = localtime(&t);
1018 #ifdef HAVE_STRFTIME
1019 strftime(TimeBuf, sizeof TimeBuf - 1, "%Y/%m/%d %H:%M:%S", tm);
1021 strlcpy(TimeBuf, asctime(tm), sizeof TimeBuf);
1024 if (TimeBuf[strlen(TimeBuf)-1] == '\n') {
1025 TimeBuf[strlen(TimeBuf)-1] = 0;
1033 * Sleep for a specified number of milliseconds.
1035 * Always returns TRUE. (In the future it might return FALSE if
1041 struct timeval tval, t1, t2;
1043 gettimeofday(&t1, NULL);
1044 gettimeofday(&t2, NULL);
1047 tval.tv_sec = (t-tdiff)/1000;
1048 tval.tv_usec = 1000*((t-tdiff)%1000);
1051 select(0,NULL,NULL, NULL, &tval);
1053 gettimeofday(&t2, NULL);
1054 tdiff = (t2.tv_sec - t1.tv_sec)*1000 +
1055 (t2.tv_usec - t1.tv_usec)/1000;
1063 * Determine if two file modification times are equivalent (either
1064 * exact or in the modification timestamp window established by
1067 * @retval 0 if the times should be treated as the same
1069 * @retval +1 if the first is later
1071 * @retval -1 if the 2nd is later
1073 int cmp_modtime(time_t file1, time_t file2)
1075 extern int modify_window;
1077 if (file2 > file1) {
1078 if (file2 - file1 <= modify_window) return 0;
1081 if (file1 - file2 <= modify_window) return 0;
1090 This routine is a trick to immediately catch errors when debugging
1091 with insure. A xterm with a gdb is popped up when insure catches
1092 a error. It is Linux specific.
1094 int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6)
1100 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'",
1101 getpid(), getpid(), getpid());
1105 h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY);
1106 fn = dlsym(h, "_Insure_trap_error");
1109 ret = fn(a1, a2, a3, a4, a5, a6);
1120 #define MALLOC_MAX 0x40000000
1122 void *_new_array(unsigned int size, unsigned long num)
1124 if (num >= MALLOC_MAX/size)
1126 return malloc(size * num);
1129 void *_realloc_array(void *ptr, unsigned int size, unsigned long num)
1131 if (num >= MALLOC_MAX/size)
1133 /* No realloc should need this, but just in case... */
1135 return malloc(size * num);
1136 return realloc(ptr, size * num);