| /* vi: set sw=4 ts=4: */ |
| /* |
| * password utility routines. |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| #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. |
| */ |
| static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix) |
| { |
| 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; |
| } |
| |
| /* 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 passwd *myuser = getpwuid(uid); |
| |
| return bb_getug(name, bufsize, |
| (myuser ? myuser->pw_name : (char*)myuser), |
| uid, 'u'); |
| } |
| /* gets a groupname given a gid */ |
| char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid) |
| { |
| struct group *mygroup = getgrgid(gid); |
| |
| return bb_getug(group, bufsize, |
| (mygroup ? mygroup->gr_name : (char*)mygroup), |
| gid, 'g'); |
| } |
| |
| /* returns a gid given a group name */ |
| long FAST_FUNC xgroup2gid(const char *name) |
| { |
| struct group *mygroup; |
| |
| mygroup = getgrnam(name); |
| if (mygroup == NULL) |
| bb_error_msg_and_die("unknown group name: %s", name); |
| |
| return mygroup->gr_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 %s", name); |
| |
| return myuser->pw_uid; |
| } |
| |
| 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; |
| } |