diff options
Diffstat (limited to 'libbb/bb_pwd.c')
| -rw-r--r-- | libbb/bb_pwd.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libbb/bb_pwd.c b/libbb/bb_pwd.c new file mode 100644 index 000000000..b5125b0f4 --- /dev/null +++ b/libbb/bb_pwd.c @@ -0,0 +1,130 @@ +/* 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 <stdio.h> +#include <string.h> +#include <assert.h> +#include "libbb.h" + + /* + * 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 */ +static char * bb_getug(char *buffer, char *idname, long id, int bufsize, 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; +} + + /* 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) +{ + struct group *mygroup = getgrgid(gid); + + return bb_getug(group, (mygroup) ? + mygroup->gr_name : (char *)mygroup, gid, bufsize, 'g'); +} + +/* returns a gid given a group name */ +long bb_xgetgrnam(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 bb_xgetpwnam(const char *name) +{ + struct passwd *myuser; + + myuser = getpwnam(name); + if (myuser==NULL) + bb_error_msg_and_die("unknown user name: %s", name); + + return myuser->pw_uid; +} + + /* 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) +{ + struct passwd *myuser = getpwuid(uid); + + return bb_getug(name, myuser ? myuser->pw_name : (char *)myuser, + uid, bufsize, 'u'); +} + +unsigned long get_ug_id(const char *s, + long (*__bb_getxxnam)(const char *)) +{ + unsigned long r; + + r = bb_strtoul(s, NULL, 10); + if (errno) + r = __bb_getxxnam(s); + + return r; +} |