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    Contents of /trunk/mkinitrd-magellan/busybox/libbb/bb_pwd.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 4066 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * password utility routines.
    4 *
    5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    6 *
    7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    8 */
    9
    10 #include "libbb.h"
    11
    12 #define assert(x) ((void)0)
    13
    14 /*
    15 * if bufsize is > 0 char *buffer cannot be set to NULL.
    16 * If idname is not NULL it is written on the static
    17 * allocated buffer (and a pointer to it is returned).
    18 * if idname is NULL, id as string is written to the static
    19 * allocated buffer and NULL is returned.
    20 * if bufsize is = 0 char *buffer can be set to NULL.
    21 * If idname exists a pointer to it is returned,
    22 * else NULL is returned.
    23 * if bufsize is < 0 char *buffer can be set to NULL.
    24 * If idname exists a pointer to it is returned,
    25 * else an error message is printed and the program exits.
    26 */
    27
    28 /* internal function for bb_getpwuid and bb_getgrgid */
    29 static char* bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
    30 {
    31 if (bufsize > 0 ) {
    32 assert(buffer != NULL);
    33 if (idname) {
    34 return safe_strncpy(buffer, idname, bufsize);
    35 }
    36 snprintf(buffer, bufsize, "%ld", id);
    37 } else if (bufsize < 0 && !idname) {
    38 bb_error_msg_and_die("unknown %cid %ld", prefix, id);
    39 }
    40 return idname;
    41 }
    42
    43 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
    44 * flexible :
    45 *
    46 * if bufsize is > 0 char *group cannot be set to NULL.
    47 * On success groupname is written on static allocated buffer
    48 * group (and a pointer to it is returned).
    49 * On failure gid as string is written to static allocated
    50 * buffer group and NULL is returned.
    51 * if bufsize is = 0 char *group can be set to NULL.
    52 * On success groupname is returned.
    53 * On failure NULL is returned.
    54 * if bufsize is < 0 char *group can be set to NULL.
    55 * On success groupname is returned.
    56 * On failure an error message is printed and
    57 * the program exits.
    58 */
    59
    60 /* gets a groupname given a gid */
    61 char* bb_getgrgid(char *group, long gid, int bufsize)
    62 {
    63 struct group *mygroup = getgrgid(gid);
    64
    65 return bb_getug(group,
    66 mygroup ? mygroup->gr_name : (char *)mygroup,
    67 gid, bufsize, 'g');
    68 }
    69
    70 /* returns a gid given a group name */
    71 long xgroup2gid(const char *name)
    72 {
    73 struct group *mygroup;
    74
    75 mygroup = getgrnam(name);
    76 if (mygroup == NULL)
    77 bb_error_msg_and_die("unknown group name: %s", name);
    78
    79 return mygroup->gr_gid;
    80 }
    81
    82 /* returns a uid given a username */
    83 long xuname2uid(const char *name)
    84 {
    85 struct passwd *myuser;
    86
    87 myuser = getpwnam(name);
    88 if (myuser == NULL)
    89 bb_error_msg_and_die("unknown user name: %s", name);
    90
    91 return myuser->pw_uid;
    92 }
    93
    94 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
    95 * flexible :
    96 *
    97 * if bufsize is > 0 char *name cannot be set to NULL.
    98 * On success username is written on the static allocated
    99 * buffer name (and a pointer to it is returned).
    100 * On failure uid as string is written to the static
    101 * allocated buffer name and NULL is returned.
    102 * if bufsize is = 0 char *name can be set to NULL.
    103 * On success username is returned.
    104 * On failure NULL is returned.
    105 * if bufsize is < 0 char *name can be set to NULL
    106 * On success username is returned.
    107 * On failure an error message is printed and
    108 * the program exits.
    109 */
    110
    111 /* gets a username given a uid */
    112 char* bb_getpwuid(char *name, long uid, int bufsize)
    113 {
    114 struct passwd *myuser = getpwuid(uid);
    115
    116 return bb_getug(name, myuser ? myuser->pw_name : (char *)myuser,
    117 uid, bufsize, 'u');
    118 }
    119
    120 unsigned long get_ug_id(const char *s,
    121 long (*xname2id)(const char *))
    122 {
    123 unsigned long r;
    124
    125 r = bb_strtoul(s, NULL, 10);
    126 if (errno)
    127 return xname2id(s);
    128 return r;
    129 }