161 lines
3.2 KiB
C
161 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* password utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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/* TODO: maybe change API to return malloced data?
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* This will allow to stop using libc functions returning
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* pointers to static data (getpwuid)
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*/
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struct passwd* FAST_FUNC xgetpwnam(const char *name)
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{
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struct passwd *pw = getpwnam(name);
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if (!pw)
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bb_error_msg_and_die("unknown user %s", name);
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return pw;
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}
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struct group* FAST_FUNC xgetgrnam(const char *name)
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{
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struct group *gr = getgrnam(name);
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if (!gr)
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bb_error_msg_and_die("unknown group %s", name);
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return gr;
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}
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struct passwd* FAST_FUNC xgetpwuid(uid_t uid)
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{
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struct passwd *pw = getpwuid(uid);
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if (!pw)
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bb_error_msg_and_die("unknown uid %u", (unsigned)uid);
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return pw;
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}
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struct group* FAST_FUNC xgetgrgid(gid_t gid)
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{
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struct group *gr = getgrgid(gid);
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if (!gr)
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bb_error_msg_and_die("unknown gid %u", (unsigned)gid);
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return gr;
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}
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char* FAST_FUNC xuid2uname(uid_t uid)
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{
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struct passwd *pw = xgetpwuid(uid);
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return pw->pw_name;
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}
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char* FAST_FUNC xgid2group(gid_t gid)
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{
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struct group *gr = xgetgrgid(gid);
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return gr->gr_name;
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}
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char* FAST_FUNC uid2uname(uid_t uid)
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{
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struct passwd *pw = getpwuid(uid);
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return (pw) ? pw->pw_name : NULL;
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}
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char* FAST_FUNC gid2group(gid_t gid)
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{
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struct group *gr = getgrgid(gid);
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return (gr) ? gr->gr_name : NULL;
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}
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char* FAST_FUNC uid2uname_utoa(uid_t uid)
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{
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char *name = uid2uname(uid);
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return (name) ? name : utoa(uid);
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}
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char* FAST_FUNC gid2group_utoa(gid_t gid)
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{
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char *name = gid2group(gid);
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return (name) ? name : utoa(gid);
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}
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long FAST_FUNC xuname2uid(const char *name)
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{
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struct passwd *myuser;
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myuser = xgetpwnam(name);
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return myuser->pw_uid;
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}
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long FAST_FUNC xgroup2gid(const char *name)
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{
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struct group *mygroup;
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mygroup = xgetgrnam(name);
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return mygroup->gr_gid;
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}
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unsigned long FAST_FUNC get_ug_id(const char *s,
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long FAST_FUNC (*xname2id)(const char *))
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{
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unsigned long r;
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r = bb_strtoul(s, NULL, 10);
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if (errno)
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return xname2id(s);
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return r;
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}
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/* Experimental "mallocing" API.
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* The goal is nice: "we want to support a case when "guests" group is very large"
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* but the code is butt-ugly.
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*/
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#if 0
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static char *find_latest(char last, char *cp)
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{
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if (!cp)
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return last;
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cp += strlen(cp) + 1;
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if (last < cp)
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last = cp;
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return last;
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}
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struct group* FAST_FUNC xmalloc_getgrnam(const char *name)
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{
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struct {
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struct group gr;
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// May still be not enough!
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char buf[64*1024 - sizeof(struct group) - 16];
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} *s;
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struct group *grp;
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int r;
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char *last;
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char **gr_mem;
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s = xmalloc(sizeof(*s));
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r = getgrnam_r(name, &s->gr, s->buf, sizeof(s->buf), &grp);
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if (!grp) {
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free(s);
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return grp;
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}
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last = find_latest(s->buf, grp->gr_name);
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last = find_latest(last, grp->gr_passwd);
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gr_mem = grp->gr_mem;
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while (*gr_mem)
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last = find_latest(last, *gr_mem++);
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gr_mem++; /* points past NULL */
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if (last < (char*)gr_mem)
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last = (char*)gr_mem;
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//FIXME: what if we get not only truncated, but also moved here?
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// grp->gr_name pointer and friends are invalid now!!!
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s = xrealloc(s, last - (char*)s);
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return grp;
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}
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#endif
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