+
+/* turn a user name into a uid */
+int name_to_uid(char *name, uid_t *uid)
+{
+ struct passwd *pass;
+ if (!name || !*name) return 0;
+ pass = getpwnam(name);
+ if (pass) {
+ *uid = pass->pw_uid;
+ return 1;
+ }
+ return 0;
+}
+
+/* turn a group name into a gid */
+int name_to_gid(char *name, gid_t *gid)
+{
+ struct group *grp;
+ if (!name || !*name) return 0;
+ grp = getgrnam(name);
+ if (grp) {
+ *gid = grp->gr_gid;
+ return 1;
+ }
+ return 0;
+}
+
+
+/* lock a byte range in a open file */
+int lock_range(int fd, int offset, int len)
+{
+ struct flock lock;
+
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = offset;
+ lock.l_len = len;
+ lock.l_pid = 0;
+
+ return fcntl(fd,F_SETLK,&lock) == 0;
+}
+
+
+static void glob_expand_one(char *s, char **argv, int *argc, int maxargs, int sanitize_paths)
+{
+#if !(defined(HAVE_GLOB) && defined(HAVE_GLOB_H))
+ if (!*s) s = ".";
+ argv[*argc] = strdup(s);
+ (*argc)++;
+ return;
+#else
+ glob_t globbuf;
+ int i;
+
+ if (!*s) s = ".";
+
+ s = strdup(s);
+ sanitize_path(s);
+ argv[*argc] = s;
+
+ memset(&globbuf, 0, sizeof(globbuf));
+ glob(argv[*argc], 0, NULL, &globbuf);
+ if (globbuf.gl_pathc == 0) {
+ (*argc)++;
+ globfree(&globbuf);
+ return;
+ }
+ for (i=0; i<(maxargs - (*argc)) && i<globbuf.gl_pathc;i++) {
+ if (i == 0) free(argv[*argc]);
+ argv[(*argc) + i] = strdup(globbuf.gl_pathv[i]);
+ if (!argv[(*argc) + i]) out_of_memory("glob_expand");
+ }
+ globfree(&globbuf);
+ (*argc) += i;
+#endif
+}
+
+void glob_expand(char *base1, char **argv, int *argc, int maxargs, int sanitize_paths)
+{
+ char *s = argv[*argc];
+ char *p, *q;
+ char *base = base1;
+
+ if (!s || !*s) return;
+
+ if (strncmp(s, base, strlen(base)) == 0) {
+ s += strlen(base);
+ }
+
+ s = strdup(s);
+ if (!s) out_of_memory("glob_expand");
+
+ base = (char *)malloc(strlen(base1)+3);
+ if (!base) out_of_memory("glob_expand");
+
+ sprintf(base," %s/", base1);
+
+ q = s;
+ while ((p = strstr(q,base)) && ((*argc) < maxargs)) {
+ /* split it at this point */
+ *p = 0;
+ glob_expand_one(q, argv, argc, maxargs, sanitize_paths);
+ q = p+strlen(base);
+ }
+
+ if (*q && (*argc < maxargs)) glob_expand_one(q, argv, argc, maxargs, sanitize_paths);
+
+ free(s);
+ free(base);
+}
+
+/*******************************************************************
+ convert a string to lower case
+********************************************************************/
+void strlower(char *s)
+{
+ while (*s) {
+ if (isupper(*s)) *s = tolower(*s);
+ s++;
+ }
+}
+
+/* this is like vsnprintf but it always null terminates, so you
+ can fit at most n-1 chars in */
+int vslprintf(char *str, int n, const char *format, va_list ap)
+{
+ int ret = vsnprintf(str, n, format, ap);
+ if (ret >= n || ret < 0) {
+ str[n-1] = 0;
+ return -1;
+ }
+ str[ret] = 0;
+ return ret;
+}
+
+
+/* like snprintf but always null terminates */
+int slprintf(char *str, int n, char *format, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, format);
+ ret = vslprintf(str,n,format,ap);
+ va_end(ap);
+ return ret;
+}
+
+
+void *Realloc(void *p, int size)
+{
+ if (!p) return (void *)malloc(size);
+ return (void *)realloc(p, size);
+}
+
+
+void clean_fname(char *name)
+{
+ char *p;
+ int l;
+ int modified = 1;
+
+ if (!name) return;
+
+ while (modified) {
+ modified = 0;
+
+ if ((p=strstr(name,"/./"))) {
+ modified = 1;
+ while (*p) {
+ p[0] = p[2];
+ p++;
+ }
+ }
+
+ if ((p=strstr(name,"//"))) {
+ modified = 1;
+ while (*p) {
+ p[0] = p[1];
+ p++;
+ }
+ }
+
+ if (strncmp(p=name,"./",2) == 0) {
+ modified = 1;
+ do {
+ p[0] = p[2];
+ } while (*p++);
+ }
+
+ l = strlen(p=name);
+ if (l > 1 && p[l-1] == '/') {
+ modified = 1;
+ p[l-1] = 0;
+ }
+ }
+}
+
+/*
+ * Make path appear as if a chroot had occurred:
+ * 1. remove leading "/" (or replace with "." if at end)
+ * 2. remove leading ".." components
+ * 3. delete any other "<dir>/.." (recursively)
+ * While we're at it, remove double slashes and "." components like
+ * clean_fname does(), but DON'T remove a trailing slash because that
+ * is sometimes significant on command line arguments.
+ * Can only shrink paths, so sanitizes in place.
+ * Contributed by Dave Dykstra <dwd@bell-labs.com>
+ */
+
+void sanitize_path(char *p)
+{
+ char *start, *sanp;
+
+ start = p;
+ sanp = p;
+ while (*p == '/') {
+ /* remove leading slashes */
+ p++;
+ }
+ while (*p != '\0') {
+ /* this loop iterates once per filename component in p.
+ * both p (and sanp if the original had a slash) should
+ * always be left pointing after a slash
+ */
+ if ((*p == '.') && ((*(p+1) == '/') || (*(p+1) == '\0'))) {
+ /* skip "." component */
+ while (*++p == '/') {
+ /* skip following slashes */
+ ;
+ }
+ } else if ((*p == '.') && (*(p+1) == '.') &&
+ ((*(p+2) == '/') || (*(p+2) == '\0'))) {
+ /* skip ".." component followed by slash or end */
+ p += 2;
+ if (*p == '/')
+ p++;
+ if (sanp != start) {
+ /* back up sanp one level */
+ --sanp; /* now pointing at slash */
+ while ((sanp > start) && (*(sanp - 1) != '/')) {
+ /* skip back up to slash */
+ sanp--;
+ }
+ }
+ } else {
+ while (1) {
+ /* copy one component through next slash */
+ *sanp++ = *p++;
+ if ((*p == '\0') || (*(p-1) == '/')) {
+ while (*p == '/') {
+ /* skip multiple slashes */
+ p++;
+ }
+ break;
+ }
+ }
+ }
+ }
+ if (sanp == start) {
+ /* ended up with nothing, so put in "." component */
+ *sanp++ = '.';
+ }
+ *sanp = '\0';
+}
+
+
+static char curr_dir[MAXPATHLEN];
+
+/* like chdir() but can be reversed with pop_dir() if save is set. It
+ is also much faster as it remembers where we have been */
+char *push_dir(char *dir, int save)
+{
+ char *ret = curr_dir;
+ static int initialised;
+
+ if (!initialised) {
+ initialised = 1;
+ getcwd(curr_dir, sizeof(curr_dir)-1);
+ }
+
+ if (!dir) return NULL; /* this call was probably just to initialize */
+
+ if (chdir(dir)) return NULL;
+
+ if (save) {
+ ret = strdup(curr_dir);
+ }
+
+ if (*dir == '/') {
+ strlcpy(curr_dir, dir, sizeof(curr_dir));
+ } else {
+ strlcat(curr_dir,"/", sizeof(curr_dir));
+ strlcat(curr_dir,dir, sizeof(curr_dir));
+ }
+
+ clean_fname(curr_dir);
+
+ return ret;
+}
+
+/* reverse a push_dir call */
+int pop_dir(char *dir)
+{
+ int ret;
+
+ ret = chdir(dir);
+ if (ret) {
+ free(dir);
+ return ret;
+ }
+
+ strlcpy(curr_dir, dir, sizeof(curr_dir));
+
+ free(dir);
+
+ return 0;
+}
+
+/* we need to supply our own strcmp function for file list comparisons
+ to ensure that signed/unsigned usage is consistent between machines. */
+int u_strcmp(const char *cs1, const char *cs2)
+{
+ const uchar *s1 = (const uchar *)cs1;
+ const uchar *s2 = (const uchar *)cs2;
+
+ while (*s1 && *s2 && (*s1 == *s2)) {
+ s1++; s2++;
+ }
+
+ return (int)*s1 - (int)*s2;
+}
+
+static OFF_T last_ofs;
+
+void end_progress(void)
+{
+ extern int do_progress, am_server;
+
+ if (do_progress && !am_server) {
+ rprintf(FINFO,"\n");
+ }
+ last_ofs = 0;
+}
+
+void show_progress(OFF_T ofs, OFF_T size)
+{
+ extern int do_progress, am_server;
+
+ if (do_progress && !am_server) {
+ if (ofs > last_ofs + 1000) {
+ int pct = (int)((100.0*ofs)/size);
+ rprintf(FINFO,"%.0f (%d%%)\r", (double)ofs, pct);
+ last_ofs = ofs;
+ }
+ }
+}
+
+/* determine if a symlink points outside the current directory tree */
+int unsafe_symlink(char *dest, char *src)
+{
+ char *tok;
+ int depth = 0;
+
+ /* all absolute and null symlinks are unsafe */
+ if (!dest || !(*dest) || (*dest == '/')) return 1;
+
+ src = strdup(src);
+ if (!src) out_of_memory("unsafe_symlink");
+
+ /* find out what our safety margin is */
+ for (tok=strtok(src,"/"); tok; tok=strtok(NULL,"/")) {
+ if (strcmp(tok,"..") == 0) {
+ depth=0;
+ } else if (strcmp(tok,".") == 0) {
+ /* nothing */
+ } else {
+ depth++;
+ }
+ }
+ free(src);
+
+ /* drop by one to account for the filename portion */
+ depth--;
+
+ dest = strdup(dest);
+ if (!dest) out_of_memory("unsafe_symlink");
+
+ for (tok=strtok(dest,"/"); tok; tok=strtok(NULL,"/")) {
+ if (strcmp(tok,"..") == 0) {
+ depth--;
+ } else if (strcmp(tok,".") == 0) {
+ /* nothing */
+ } else {
+ depth++;
+ }
+ /* if at any point we go outside the current directory then
+ stop - it is unsafe */
+ if (depth < 0) break;
+ }
+
+ free(dest);
+ return (depth < 0);
+}
+
+
+/****************************************************************************
+ return the date and time as a string
+****************************************************************************/
+char *timestring(time_t t)
+{
+ static char TimeBuf[200];
+ struct tm *tm = localtime(&t);
+
+#ifdef HAVE_STRFTIME
+ strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %T",tm);
+#else
+ strlcpy(TimeBuf, asctime(tm), sizeof(TimeBuf));
+#endif
+
+ if (TimeBuf[strlen(TimeBuf)-1] == '\n') {
+ TimeBuf[strlen(TimeBuf)-1] = 0;
+ }
+
+ return(TimeBuf);
+}
+