* 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 <stdio.h>
-#include <string.h>
-#include <assert.h>
#include "libbb.h"
- /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
- * flexible :
- *
- * if bufsize is > 0 char *group cannot be set to NULL.
- * On success groupname is written on static allocated buffer
- * group (and a pointer to it is returned).
- * On failure gid as string is written to static allocated
- * buffer group and NULL is returned.
- * if bufsize is = 0 char *group can be set to NULL.
- * On success groupname is returned.
- * On failure NULL is returned.
- * if bufsize is < 0 char *group can be set to NULL.
- * On success groupname is returned.
- * On failure an error message is printed and
- * the program exits.
- */
-
-/* gets a groupname given a gid */
-char * bb_getgrgid(char *group, long gid, int bufsize)
+/* TODO: maybe change API to return malloced data?
+ * This will allow to stop using libc functions returning
+ * pointers to static data (getpwuid)
+ */
+
+struct passwd* FAST_FUNC xgetpwnam(const char *name)
{
- struct group *mygroup = getgrgid(gid);
+ struct passwd *pw = getpwnam(name);
+ if (!pw)
+ bb_error_msg_and_die("unknown user %s", name);
+ return pw;
+}
- return bb_getug(group, (mygroup) ?
- mygroup->gr_name : (char *)mygroup, gid, bufsize, 'g');
+struct group* FAST_FUNC xgetgrnam(const char *name)
+{
+ struct group *gr = getgrnam(name);
+ if (!gr)
+ bb_error_msg_and_die("unknown group %s", name);
+ return gr;
}
-/* returns a gid given a group name */
-long bb_xgetgrnam(const char *name)
+
+struct passwd* FAST_FUNC xgetpwuid(uid_t uid)
{
- struct group *mygroup;
+ struct passwd *pw = getpwuid(uid);
+ if (!pw)
+ bb_error_msg_and_die("unknown uid %u", (unsigned)uid);
+ return pw;
+}
- mygroup = getgrnam(name);
- if (mygroup==NULL)
- bb_error_msg_and_die("unknown group name: %s", name);
+struct group* FAST_FUNC xgetgrgid(gid_t gid)
+{
+ struct group *gr = getgrgid(gid);
+ if (!gr)
+ bb_error_msg_and_die("unknown gid %u", (unsigned)gid);
+ return gr;
+}
- return mygroup->gr_gid;
+char* FAST_FUNC xuid2uname(uid_t uid)
+{
+ struct passwd *pw = xgetpwuid(uid);
+ return pw->pw_name;
}
-/* returns a uid given a username */
-long bb_xgetpwnam(const char *name)
+char* FAST_FUNC xgid2group(gid_t gid)
{
- struct passwd *myuser;
+ struct group *gr = xgetgrgid(gid);
+ return gr->gr_name;
+}
- myuser = getpwnam(name);
- if (myuser==NULL)
- bb_error_msg_and_die("unknown user name: %s", name);
+char* FAST_FUNC uid2uname(uid_t uid)
+{
+ struct passwd *pw = getpwuid(uid);
+ return (pw) ? pw->pw_name : NULL;
+}
- return myuser->pw_uid;
+char* FAST_FUNC gid2group(gid_t gid)
+{
+ struct group *gr = getgrgid(gid);
+ return (gr) ? gr->gr_name : NULL;
}
- /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
- * flexible :
- *
- * if bufsize is > 0 char *name cannot be set to NULL.
- * On success username is written on the static allocated
- * buffer name (and a pointer to it is returned).
- * On failure uid as string is written to the static
- * allocated buffer name and NULL is returned.
- * if bufsize is = 0 char *name can be set to NULL.
- * On success username is returned.
- * On failure NULL is returned.
- * if bufsize is < 0 char *name can be set to NULL
- * On success username is returned.
- * On failure an error message is printed and
- * the program exits.
- */
-
-/* gets a username given a uid */
-char * bb_getpwuid(char *name, long uid, int bufsize)
+char* FAST_FUNC uid2uname_utoa(uid_t uid)
{
- struct passwd *myuser = getpwuid(uid);
+ char *name = uid2uname(uid);
+ return (name) ? name : utoa(uid);
+}
- return bb_getug(name, (myuser) ?
- myuser->pw_name : (char *)myuser , uid, bufsize, 'u');
+char* FAST_FUNC gid2group_utoa(gid_t gid)
+{
+ char *name = gid2group(gid);
+ return (name) ? name : utoa(gid);
}
- /*
- * if bufsize is > 0 char *buffer cannot be set to NULL.
- * If idname is not NULL it is written on the static
- * allocated buffer (and a pointer to it is returned).
- * if idname is NULL, id as string is written to the static
- * allocated buffer and NULL is returned.
- * if bufsize is = 0 char *buffer can be set to NULL.
- * If idname exists a pointer to it is returned,
- * else NULL is returned.
- * if bufsize is < 0 char *buffer can be set to NULL.
- * If idname exists a pointer to it is returned,
- * else an error message is printed and the program exits.
- */
-
-/* internal function for bb_getpwuid and bb_getgrgid */
-char * bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
+long FAST_FUNC xuname2uid(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 *myuser;
+
+ myuser = xgetpwnam(name);
+ return myuser->pw_uid;
}
-unsigned long get_ug_id(const char *s,
- long (*__bb_getxxnam)(const char *))
+long FAST_FUNC xgroup2gid(const char *name)
{
- unsigned long r;
- char *p;
+ struct group *mygroup;
- r = strtoul(s, &p, 10);
- if (*p || (s == p)) {
- r = __bb_getxxnam(s);
- }
+ mygroup = xgetgrnam(name);
+ return mygroup->gr_gid;
+}
+unsigned long FAST_FUNC get_ug_id(const char *s,
+ long FAST_FUNC (*xname2id)(const char *))
+{
+ unsigned long r;
+
+ r = bb_strtoul(s, NULL, 10);
+ if (errno)
+ 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