* password utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
-#define assert(x) ((void)0)
-
-/* internal function for bb_getpwuid and bb_getgrgid */
-/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
- * flexible:
- *
- * bufsize > 0: If idname is not NULL it is copied to buffer,
- * and buffer is returned. Else id as string is written
- * to buffer, and NULL is returned.
- *
- * bufsize == 0: idname is returned.
- *
- * bufsize < 0: If idname is not NULL it is returned.
- * Else an error message is printed and the program exits.
+/* TODO: maybe change API to return malloced data?
+ * This will allow to stop using libc functions returning
+ * pointers to static data (getpwuid)
*/
-static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
+
+struct passwd* FAST_FUNC xgetpwnam(const char *name)
{
- if (bufsize > 0) {
- assert(buffer != NULL);
- if (idname) {
- return safe_strncpy(buffer, idname, bufsize);
- }
- snprintf(buffer, bufsize, "%ld", id);
- } else if (bufsize < 0 && !idname) {
- bb_error_msg_and_die("unknown %cid %ld", prefix, id);
- }
- return idname;
+ struct passwd *pw = getpwnam(name);
+ if (!pw)
+ bb_error_msg_and_die("unknown user %s", name);
+ return pw;
}
-/* bb_getpwuid, bb_getgrgid:
- * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
- * as a string to buf, return user/group name or NULL
- * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
- * bb_getXXXid(NULL, -1, id) - return user/group name or exit
- */
-/* gets a username given a uid */
-char* FAST_FUNC bb_getpwuid(char *name, int bufsize, long uid)
+struct group* FAST_FUNC xgetgrnam(const char *name)
{
- struct passwd *myuser = getpwuid(uid);
+ struct group *gr = getgrnam(name);
+ if (!gr)
+ bb_error_msg_and_die("unknown group %s", name);
+ return gr;
+}
+
- return bb_getug(name, bufsize,
- (myuser ? myuser->pw_name : (char*)myuser),
- uid, 'u');
+struct passwd* FAST_FUNC xgetpwuid(uid_t uid)
+{
+ struct passwd *pw = getpwuid(uid);
+ if (!pw)
+ bb_error_msg_and_die("unknown uid %u", (unsigned)uid);
+ return pw;
}
-/* gets a groupname given a gid */
-char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid)
+
+struct group* FAST_FUNC xgetgrgid(gid_t gid)
{
- struct group *mygroup = getgrgid(gid);
+ struct group *gr = getgrgid(gid);
+ if (!gr)
+ bb_error_msg_and_die("unknown gid %u", (unsigned)gid);
+ return gr;
+}
- return bb_getug(group, bufsize,
- (mygroup ? mygroup->gr_name : (char*)mygroup),
- gid, 'g');
+char* FAST_FUNC xuid2uname(uid_t uid)
+{
+ struct passwd *pw = xgetpwuid(uid);
+ return pw->pw_name;
}
-/* returns a gid given a group name */
-long FAST_FUNC xgroup2gid(const char *name)
+char* FAST_FUNC xgid2group(gid_t gid)
{
- struct group *mygroup;
+ struct group *gr = xgetgrgid(gid);
+ return gr->gr_name;
+}
- mygroup = getgrnam(name);
- if (mygroup == NULL)
- bb_error_msg_and_die("unknown group name: %s", name);
+char* FAST_FUNC uid2uname(uid_t uid)
+{
+ struct passwd *pw = getpwuid(uid);
+ return (pw) ? pw->pw_name : NULL;
+}
- return mygroup->gr_gid;
+char* FAST_FUNC gid2group(gid_t gid)
+{
+ struct group *gr = getgrgid(gid);
+ return (gr) ? gr->gr_name : NULL;
+}
+
+char* FAST_FUNC uid2uname_utoa(uid_t uid)
+{
+ char *name = uid2uname(uid);
+ return (name) ? name : utoa(uid);
+}
+
+char* FAST_FUNC gid2group_utoa(gid_t gid)
+{
+ char *name = gid2group(gid);
+ return (name) ? name : utoa(gid);
}
-/* returns a uid given a username */
long FAST_FUNC xuname2uid(const char *name)
{
struct passwd *myuser;
- myuser = getpwnam(name);
- if (myuser == NULL)
- bb_error_msg_and_die("unknown user name: %s", name);
-
+ myuser = xgetpwnam(name);
return myuser->pw_uid;
}
+long FAST_FUNC xgroup2gid(const char *name)
+{
+ struct group *mygroup;
+
+ mygroup = xgetgrnam(name);
+ return mygroup->gr_gid;
+}
+
unsigned long FAST_FUNC get_ug_id(const char *s,
long FAST_FUNC (*xname2id)(const char *))
{
return xname2id(s);
return r;
}
+
+/* Experimental "mallocing" API.
+ * The goal is nice: "we want to support a case when "guests" group is very large"
+ * but the code is butt-ugly.
+ */
+#if 0
+static char *find_latest(char last, char *cp)
+{
+ if (!cp)
+ return last;
+ cp += strlen(cp) + 1;
+ if (last < cp)
+ last = cp;
+ return last;
+}
+
+struct group* FAST_FUNC xmalloc_getgrnam(const char *name)
+{
+ struct {
+ struct group gr;
+ // May still be not enough!
+ char buf[64*1024 - sizeof(struct group) - 16];
+ } *s;
+ struct group *grp;
+ int r;
+ char *last;
+ char **gr_mem;
+
+ s = xmalloc(sizeof(*s));
+ r = getgrnam_r(name, &s->gr, s->buf, sizeof(s->buf), &grp);
+ if (!grp) {
+ free(s);
+ return grp;
+ }
+ last = find_latest(s->buf, grp->gr_name);
+ last = find_latest(last, grp->gr_passwd);
+ gr_mem = grp->gr_mem;
+ while (*gr_mem)
+ last = find_latest(last, *gr_mem++);
+ gr_mem++; /* points past NULL */
+ if (last < (char*)gr_mem)
+ last = (char*)gr_mem;
+//FIXME: what if we get not only truncated, but also moved here?
+// grp->gr_name pointer and friends are invalid now!!!
+ s = xrealloc(s, last - (char*)s);
+ return grp;
+}
+#endif
projects / oweals / busybox.git / blobdiff