369 lines
9.3 KiB
C
369 lines
9.3 KiB
C
/* $NetBSD: parse_netgroup.c,v 1.6 2003/08/07 11:25:51 agc Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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. 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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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: parse_netgroup.c,v 1.6 2003/08/07 11:25:51 agc Exp $");
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#endif
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/*
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* This is a specially hacked-up version of getnetgrent.c used to parse
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* data from the stored hash table of netgroup info rather than from a
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* file. It's used mainly for the parse_netgroup() function. All the YP
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* stuff and file support has been stripped out since it isn't needed.
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*/
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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 <unistd.h>
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#include "hash.h"
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/*
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* Static Variables and functions used by rng_setnetgrent(), rng_getnetgrent()
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* and rng_endnetgrent().
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*
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* There are two linked lists:
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* - linelist is just used by setnetgrent() to parse the net group file via.
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* parse_netgrp()
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* - netgrp is the list of entries for the current netgroup
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*/
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struct linelist {
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struct linelist *l_next; /* Chain ptr. */
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int l_parsed; /* Flag for cycles */
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char *l_groupname; /* Name of netgroup */
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char *l_line; /* Netgroup entrie(s) to be parsed */
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};
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struct netgrp {
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struct netgrp *ng_next; /* Chain ptr */
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char *ng_str[3]; /* Field pointers, see below */
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};
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#define NG_HOST 0 /* Host name */
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#define NG_USER 1 /* User name */
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#define NG_DOM 2 /* and Domain name */
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static struct linelist *linehead = (struct linelist *)0;
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static struct netgrp *nextgrp = (struct netgrp *)0;
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static struct {
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struct netgrp *gr;
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char *grname;
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} grouphead = {
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(struct netgrp *)0,
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(char *)0,
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};
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extern struct group_entry *gtable[];
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static int parse_netgrp(const char *);
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static struct linelist *read_for_group(const char *);
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/*
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* rng_setnetgrent()
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* Parse the netgroup file looking for the netgroup and build the list
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* of netgrp structures. Let parse_netgrp() and read_for_group() do
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* most of the work.
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*/
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void
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rng_setnetgrent(const char *group)
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{
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/* Sanity check */
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if (group == NULL || !strlen(group))
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return;
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if (grouphead.gr == (struct netgrp *)0 ||
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strcmp(group, grouphead.grname)) {
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rng_endnetgrent();
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if (parse_netgrp(group))
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rng_endnetgrent();
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else
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grouphead.grname = strdup(group);
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}
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nextgrp = grouphead.gr;
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}
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/*
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* Get the next netgroup off the list.
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*/
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int
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rng_getnetgrent(char **hostp, char **userp, char **domp)
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{
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if (nextgrp) {
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*hostp = nextgrp->ng_str[NG_HOST];
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*userp = nextgrp->ng_str[NG_USER];
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*domp = nextgrp->ng_str[NG_DOM];
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nextgrp = nextgrp->ng_next;
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return (1);
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}
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return (0);
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}
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/*
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* rng_endnetgrent() - cleanup
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*/
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void
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rng_endnetgrent(void)
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{
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struct linelist *lp, *olp;
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struct netgrp *gp, *ogp;
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lp = linehead;
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while (lp) {
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olp = lp;
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lp = lp->l_next;
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free(olp->l_groupname);
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free(olp->l_line);
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free((char *)olp);
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}
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linehead = (struct linelist *)0;
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if (grouphead.grname) {
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free(grouphead.grname);
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grouphead.grname = (char *)0;
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}
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gp = grouphead.gr;
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while (gp) {
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ogp = gp;
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gp = gp->ng_next;
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if (ogp->ng_str[NG_HOST])
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free(ogp->ng_str[NG_HOST]);
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if (ogp->ng_str[NG_USER])
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free(ogp->ng_str[NG_USER]);
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if (ogp->ng_str[NG_DOM])
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free(ogp->ng_str[NG_DOM]);
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free((char *)ogp);
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}
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grouphead.gr = (struct netgrp *)0;
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}
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/*
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* Parse the netgroup file setting up the linked lists.
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*/
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static int
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parse_netgrp(const char *group)
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{
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char *spos, *epos;
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int len, strpos;
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#ifdef DEBUG
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int fields;
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#endif
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char *pos, *gpos;
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struct netgrp *grp;
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struct linelist *lp = linehead;
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/*
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* First, see if the line has already been read in.
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*/
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while (lp) {
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if (!strcmp(group, lp->l_groupname))
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break;
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lp = lp->l_next;
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}
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if (lp == (struct linelist *)0 &&
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(lp = read_for_group(group)) == (struct linelist *)0)
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return (1);
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if (lp->l_parsed) {
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#ifdef DEBUG
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/*
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* This error message is largely superflous since the
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* code handles the error condition successfully, and
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* spewing it out from inside libc can actually hose
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* certain programs.
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*/
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warnx("Cycle in netgroup %s", lp->l_groupname);
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#endif
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return (1);
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} else
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lp->l_parsed = 1;
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pos = lp->l_line;
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/* Watch for null pointer dereferences, dammit! */
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while (pos != NULL && *pos != '\0') {
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if (*pos == '(') {
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grp = (struct netgrp *)malloc(sizeof (struct netgrp));
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memset((char *)grp, 0, sizeof (struct netgrp));
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grp->ng_next = grouphead.gr;
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grouphead.gr = grp;
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pos++;
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gpos = strsep(&pos, ")");
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#ifdef DEBUG
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fields = 0;
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#endif
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for (strpos = 0; strpos < 3; strpos++) {
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if ((spos = strsep(&gpos, ","))) {
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#ifdef DEBUG
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fields++;
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#endif
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while (*spos == ' ' || *spos == '\t')
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spos++;
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if ((epos = strpbrk(spos, " \t"))) {
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*epos = '\0';
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len = epos - spos;
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} else
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len = strlen(spos);
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if (len > 0) {
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grp->ng_str[strpos] = (char *)
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malloc(len + 1);
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memmove(grp->ng_str[strpos],
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spos, len + 1);
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}
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} else {
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/*
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* All other systems I've tested
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* return NULL for empty netgroup
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* fields. It's up to user programs
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* to handle the NULLs appropriately.
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*/
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grp->ng_str[strpos] = NULL;
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}
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}
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#ifdef DEBUG
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/*
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* Note: on other platforms, malformed netgroup
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* entries are not normally flagged. While we
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* can catch bad entries and report them, we should
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* stay silent by default for compatibility's sake.
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*/
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if (fields < 3)
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warnx(
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"Bad entry (%s%s%s%s%s) in netgroup \"%s\"",
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grp->ng_str[NG_HOST] == NULL ? "" :
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grp->ng_str[NG_HOST],
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grp->ng_str[NG_USER] == NULL ? "" : ",",
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grp->ng_str[NG_USER] == NULL ? "" :
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grp->ng_str[NG_USER],
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grp->ng_str[NG_DOM] == NULL ? "" : ",",
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grp->ng_str[NG_DOM] == NULL ? "" :
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grp->ng_str[NG_DOM],
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lp->l_groupname);
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#endif
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} else {
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spos = strsep(&pos, ", \t");
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if (parse_netgrp(spos))
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continue;
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}
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/* Watch for null pointer dereferences, dammit! */
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if (pos != NULL)
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while (*pos == ' ' || *pos == ',' || *pos == '\t')
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pos++;
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}
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return (0);
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}
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/*
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* Read the netgroup file and save lines until the line for the netgroup
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* is found. Return 1 if eof is encountered.
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*/
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static struct linelist *
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read_for_group(const char *group)
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{
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char *pos, *spos, *linep = NULL, *olinep = NULL;
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int len, olen;
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int cont;
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struct linelist *lp;
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char line[LINSIZ + 1];
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char *data = NULL;
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data = lookup (gtable, group);
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snprintf(line, sizeof(line), "%s %s", group, data);
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pos = (char *)&line;
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#ifdef CANT_HAPPEN
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if (*pos == '#')
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continue;
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#endif
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while (*pos == ' ' || *pos == '\t')
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pos++;
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spos = pos;
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while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
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*pos != '\0')
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pos++;
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len = pos - spos;
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while (*pos == ' ' || *pos == '\t')
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pos++;
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if (*pos != '\n' && *pos != '\0') {
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lp = (struct linelist *)malloc(sizeof (*lp));
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lp->l_parsed = 0;
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lp->l_groupname = (char *)malloc(len + 1);
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memmove(lp->l_groupname, spos, len);
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*(lp->l_groupname + len) = '\0';
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len = strlen(pos);
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olen = 0;
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/*
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* Loop around handling line continuations.
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*/
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do {
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if (*(pos + len - 1) == '\n')
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len--;
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if (*(pos + len - 1) == '\\') {
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len--;
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cont = 1;
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} else
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cont = 0;
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if (len > 0) {
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linep = (char *)malloc(olen + len + 1);
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if (olen > 0) {
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memmove(linep, olinep, olen);
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free(olinep);
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}
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memmove(linep + olen, pos, len);
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olen += len;
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*(linep + olen) = '\0';
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olinep = linep;
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}
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#ifdef CANT_HAPPEN
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if (cont) {
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if (fgets(line, LINSIZ, netf)) {
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pos = line;
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len = strlen(pos);
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} else
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cont = 0;
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}
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#endif
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} while (cont);
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lp->l_line = linep;
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lp->l_next = linehead;
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linehead = lp;
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#ifdef CANT_HAPPEN
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/*
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* If this is the one we wanted, we are done.
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*/
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if (!strcmp(lp->l_groupname, group))
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#endif
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return (lp);
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}
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return ((struct linelist *)0);
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}
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