439 lines
9.0 KiB
C
439 lines
9.0 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <grp.h>
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static FILE *_gr_fp;
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static struct group _gr_group;
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static int _gr_stayopen;
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static int grscan(), start_gr();
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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static int _gr_stepping_yp;
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static int _gr_yp_enabled;
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static int _getypgroup(struct group *, const char *, char *);
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static int _nextypgroup(struct group *);
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#endif
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#define MAXGRP 200
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static char *members[MAXGRP];
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#define MAXLINELENGTH 1024
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static char line[MAXLINELENGTH];
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struct group *
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getgrent()
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{
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if (!_gr_fp && !start_gr()) {
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return NULL;
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}
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#ifdef YP
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if (_gr_stepping_yp) {
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if (_nextypgroup(&_gr_group))
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return(&_gr_group);
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}
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tryagain:
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#endif
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if (!grscan(0, 0, NULL))
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return(NULL);
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#ifdef YP
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if(_gr_group.gr_name[0] == '+' && _gr_group.gr_name[1]) {
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_getypgroup(&_gr_group, &_gr_group.gr_name[1],
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"group.byname");
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} else if(_gr_group.gr_name[0] == '+') {
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if (!_nextypgroup(&_gr_group))
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goto tryagain;
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else
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return(&_gr_group);
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}
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#endif
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return(&_gr_group);
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}
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struct group *
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getgrnam(name)
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const char *name;
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{
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int rval;
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if (!start_gr())
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return(NULL);
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#ifdef YP
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tryagain:
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#endif
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rval = grscan(1, 0, name);
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#ifdef YP
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if(rval == -1 && (_gr_yp_enabled < 0 || (_gr_yp_enabled &&
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_gr_group.gr_name[0] == '+'))) {
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if (!(rval = _getypgroup(&_gr_group, name, "group.byname")))
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goto tryagain;
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}
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#endif
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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struct group *
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#ifdef __STDC__
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getgrgid(gid_t gid)
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#else
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getgrgid(gid)
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gid_t gid;
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#endif
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{
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int rval;
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if (!start_gr())
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return(NULL);
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#ifdef YP
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tryagain:
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#endif
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rval = grscan(1, gid, NULL);
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#ifdef YP
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if(rval == -1 && _gr_yp_enabled) {
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char buf[16];
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snprintf(buf, sizeof buf, "%d", (unsigned)gid);
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if (!(rval = _getypgroup(&_gr_group, buf, "group.bygid")))
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goto tryagain;
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}
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#endif
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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static int
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start_gr()
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{
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if (_gr_fp) {
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rewind(_gr_fp);
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return(1);
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}
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_gr_fp = fopen(_PATH_GROUP, "r");
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if(!_gr_fp) return 0;
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#ifdef YP
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/*
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* This is a disgusting hack, used to determine when YP is enabled.
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* This would be easier if we had a group database to go along with
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* the password database.
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*/
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{
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char *line;
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size_t linelen;
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_gr_yp_enabled = 0;
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while((line = fgetln(_gr_fp, &linelen)) != NULL) {
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if(line[0] == '+') {
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if(line[1] && !_gr_yp_enabled) {
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_gr_yp_enabled = 1;
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} else {
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_gr_yp_enabled = -1;
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break;
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}
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}
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}
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rewind(_gr_fp);
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}
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#endif
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return 1;
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}
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int
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setgrent()
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{
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return(setgroupent(0));
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}
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int
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setgroupent(stayopen)
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int stayopen;
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{
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if (!start_gr())
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return(0);
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_gr_stayopen = stayopen;
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#ifdef YP
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_gr_stepping_yp = 0;
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#endif
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return(1);
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}
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void
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endgrent()
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{
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#ifdef YP
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_gr_stepping_yp = 0;
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#endif
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if (_gr_fp) {
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(void)fclose(_gr_fp);
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_gr_fp = NULL;
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}
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}
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static int
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grscan(search, gid, name)
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register int search, gid;
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register char *name;
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{
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register char *cp, **m;
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char *bp;
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#ifdef YP
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int _ypfound = 0;
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#endif;
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for (;;) {
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if (!fgets(line, sizeof(line), _gr_fp))
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return(0);
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bp = line;
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/* skip lines that are too big */
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if (!index(line, '\n')) {
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int ch;
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while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
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;
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continue;
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}
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if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
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break;
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#ifdef YP
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/*
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* XXX We need to be careful to avoid proceeding
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* past this point under certain circumstances or
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* we risk dereferencing null pointers down below.
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*/
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if (_gr_group.gr_name[0] == '+') {
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if (strlen(_gr_group.gr_name) == 1) {
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switch(search) {
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case 0:
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return(1);
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case 1:
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return(-1);
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default:
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return(0);
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}
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} else {
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if (!_getypgroup(&_gr_group, &_gr_group.gr_name[1],
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"group.byname"))
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continue;
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/* We're going to override -- tell the world. */
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members[0] = NULL;
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_ypfound++;
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}
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}
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#else
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if (_gr_group.gr_name[0] == '+')
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continue;
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#endif /* YP */
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if (search && name) {
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if(strcmp(_gr_group.gr_name, name)) {
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continue;
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}
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}
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if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
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break;;
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if (!(cp = strsep(&bp, ":\n")))
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continue;
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#ifdef YP
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if (!_ypfound)
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#endif
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_gr_group.gr_gid = atoi(cp);
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if (search && name == NULL && _gr_group.gr_gid != gid)
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continue;
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cp = NULL;
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for (m = _gr_group.gr_mem = members;; bp++) {
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if (m == &members[MAXGRP - 1])
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break;
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if (*bp == ',') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL)
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cp = bp;
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}
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*m = NULL;
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return(1);
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}
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/* NOTREACHED */
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return (0);
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}
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#ifdef YP
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static int
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_gr_breakout_yp(struct group *gr, char *result)
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{
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char *s, *cp;
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char **m;
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/*
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* XXX If 's' ends up being a NULL pointer, punt on this group.
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* It means the NIS group entry is badly formatted and should
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* be skipped.
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*/
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if ((s = strsep(&result, ":")) == NULL) return 0; /* name */
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gr->gr_name = s;
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if ((s = strsep(&result, ":")) == NULL) return 0; /* password */
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gr->gr_passwd = s;
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if ((s = strsep(&result, ":")) == NULL) return 0; /* gid */
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gr->gr_gid = atoi(s);
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if ((s = result) == NULL) return 0;
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cp = 0;
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for (m = _gr_group.gr_mem = members; /**/; s++) {
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if (m == &members[MAXGRP - 1]) {
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break;
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}
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if (*s == ',') {
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if (cp) {
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*s = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*s == '\0' || *s == '\n' || *s == ' ') {
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if (cp) {
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*s = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL) {
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cp = s;
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}
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}
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*m = NULL;
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return 1;
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}
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static char *_gr_yp_domain;
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static int
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_getypgroup(struct group *gr, const char *name, char *map)
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{
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char *result, *s;
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static char resultbuf[1024];
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int resultlen;
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if(!_gr_yp_domain) {
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if(yp_get_default_domain(&_gr_yp_domain))
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return 0;
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}
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if(yp_match(_gr_yp_domain, map, name, strlen(name),
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&result, &resultlen))
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return 0;
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s = strchr(result, '\n');
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if(s) *s = '\0';
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if(resultlen >= sizeof resultbuf) return 0;
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strcpy(resultbuf, result);
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result = resultbuf;
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return(_gr_breakout_yp(gr, resultbuf));
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}
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static int
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_nextypgroup(struct group *gr)
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{
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static char *key;
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static int keylen;
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char *lastkey, *result;
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static char resultbuf[1024];
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int resultlen;
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int rv;
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if(!_gr_yp_domain) {
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if(yp_get_default_domain(&_gr_yp_domain))
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return 0;
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}
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if(!_gr_stepping_yp) {
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if(key) free(key);
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rv = yp_first(_gr_yp_domain, "group.byname",
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&key, &keylen, &result, &resultlen);
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if(rv) {
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return 0;
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}
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_gr_stepping_yp = 1;
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goto unpack;
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} else {
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tryagain:
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lastkey = key;
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rv = yp_next(_gr_yp_domain, "group.byname", key, keylen,
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&key, &keylen, &result, &resultlen);
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free(lastkey);
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unpack:
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if(rv) {
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_gr_stepping_yp = 0;
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return 0;
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}
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if(resultlen > sizeof(resultbuf)) {
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free(result);
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goto tryagain;
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}
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strcpy(resultbuf, result);
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free(result);
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if((result = strchr(resultbuf, '\n')) != NULL)
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*result = '\0';
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if (_gr_breakout_yp(gr, resultbuf))
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return(1);
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else
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goto tryagain;
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}
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}
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#endif /* YP */
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