| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * password utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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| 12 | #define assert(x) ((void)0)
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| 13 |
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| 14 | /* internal function for bb_getpwuid and bb_getgrgid */
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| 15 | /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
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| 16 | * flexible:
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| 17 | *
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| 18 | * bufsize > 0: If idname is not NULL it is copied to buffer,
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| 19 | * and buffer is returned. Else id as string is written
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| 20 | * to buffer, and NULL is returned.
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| 21 | *
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| 22 | * bufsize == 0: idname is returned.
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| 23 | *
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| 24 | * bufsize < 0: If idname is not NULL it is returned.
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| 25 | * Else an error message is printed and the program exits.
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| 26 | */
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| 27 | static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
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| 28 | {
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| 29 | if (bufsize > 0) {
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| 30 | assert(buffer != NULL);
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| 31 | if (idname) {
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| 32 | return safe_strncpy(buffer, idname, bufsize);
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| 33 | }
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| 34 | snprintf(buffer, bufsize, "%ld", id);
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| 35 | } else if (bufsize < 0 && !idname) {
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| 36 | bb_error_msg_and_die("unknown %cid %ld", prefix, id);
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| 37 | }
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| 38 | return idname;
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| 39 | }
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| 40 |
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| 41 | /* bb_getpwuid, bb_getgrgid:
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| 42 | * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
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| 43 | * as a string to buf, return user/group name or NULL
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| 44 | * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
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| 45 | * bb_getXXXid(NULL, -1, id) - return user/group name or exit
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| 46 | */
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| 47 | /* gets a username given a uid */
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| 48 | char* bb_getpwuid(char *name, int bufsize, long uid)
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| 49 | {
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| 50 | struct passwd *myuser = getpwuid(uid);
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| 51 |
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| 52 | return bb_getug(name, bufsize,
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| 53 | (myuser ? myuser->pw_name : (char*)myuser),
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| 54 | uid, 'u');
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| 55 | }
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| 56 | /* gets a groupname given a gid */
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| 57 | char* bb_getgrgid(char *group, int bufsize, long gid)
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| 58 | {
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| 59 | struct group *mygroup = getgrgid(gid);
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| 60 |
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| 61 | return bb_getug(group, bufsize,
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| 62 | (mygroup ? mygroup->gr_name : (char*)mygroup),
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| 63 | gid, 'g');
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| 64 | }
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| 65 |
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| 66 | /* returns a gid given a group name */
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| 67 | long xgroup2gid(const char *name)
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| 68 | {
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| 69 | struct group *mygroup;
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| 70 |
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| 71 | mygroup = getgrnam(name);
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| 72 | if (mygroup == NULL)
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| 73 | bb_error_msg_and_die("unknown group name: %s", name);
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| 74 |
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| 75 | return mygroup->gr_gid;
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| 76 | }
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| 77 |
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| 78 | /* returns a uid given a username */
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| 79 | long xuname2uid(const char *name)
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| 80 | {
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| 81 | struct passwd *myuser;
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| 82 |
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| 83 | myuser = getpwnam(name);
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| 84 | if (myuser == NULL)
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| 85 | bb_error_msg_and_die("unknown user name: %s", name);
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| 86 |
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| 87 | return myuser->pw_uid;
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| 88 | }
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| 89 |
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| 90 | unsigned long get_ug_id(const char *s,
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| 91 | long (*xname2id)(const char *))
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| 92 | {
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| 93 | unsigned long r;
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| 94 |
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| 95 | r = bb_strtoul(s, NULL, 10);
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| 96 | if (errno)
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| 97 | return xname2id(s);
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| 98 | return r;
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| 99 | }
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