373 lines
9.7 KiB
C
373 lines
9.7 KiB
C
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Rick Macklem at The University of Guelph.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "$Id: parse_netgroup.c,v 1.2 1996/05/12 17:17:44 wpaul Exp $";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*
|
|
* This is a specially hacked-up version of getnetgrent.c used to parse
|
|
* data from the stored hash table of netgroup info rather than from a
|
|
* file. It's used mainly for the parse_netgroup() function. All the YP
|
|
* stuff and file support has been stripped out since it isn't needed.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <strings.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "hash.h"
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] = "$Id: parse_netgroup.c,v 1.2 1996/05/12 17:17:44 wpaul Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* Static Variables and functions used by setnetgrent(), getnetgrent() and
|
|
* __endnetgrent().
|
|
* There are two linked lists:
|
|
* - linelist is just used by setnetgrent() to parse the net group file via.
|
|
* parse_netgrp()
|
|
* - netgrp is the list of entries for the current netgroup
|
|
*/
|
|
struct linelist {
|
|
struct linelist *l_next; /* Chain ptr. */
|
|
int l_parsed; /* Flag for cycles */
|
|
char *l_groupname; /* Name of netgroup */
|
|
char *l_line; /* Netgroup entrie(s) to be parsed */
|
|
};
|
|
|
|
struct netgrp {
|
|
struct netgrp *ng_next; /* Chain ptr */
|
|
char *ng_str[3]; /* Field pointers, see below */
|
|
};
|
|
#define NG_HOST 0 /* Host name */
|
|
#define NG_USER 1 /* User name */
|
|
#define NG_DOM 2 /* and Domain name */
|
|
|
|
static struct linelist *linehead = (struct linelist *)0;
|
|
static struct netgrp *nextgrp = (struct netgrp *)0;
|
|
static struct {
|
|
struct netgrp *gr;
|
|
char *grname;
|
|
} grouphead = {
|
|
(struct netgrp *)0,
|
|
(char *)0,
|
|
};
|
|
static int parse_netgrp();
|
|
static struct linelist *read_for_group();
|
|
void __setnetgrent(), __endnetgrent();
|
|
int __getnetgrent();
|
|
extern struct group_entry *gtable[];
|
|
|
|
/*
|
|
* setnetgrent()
|
|
* Parse the netgroup file looking for the netgroup and build the list
|
|
* of netgrp structures. Let parse_netgrp() and read_for_group() do
|
|
* most of the work.
|
|
*/
|
|
void
|
|
__setnetgrent(group)
|
|
char *group;
|
|
{
|
|
/* Sanity check */
|
|
|
|
if (group == NULL || !strlen(group))
|
|
return;
|
|
|
|
if (grouphead.gr == (struct netgrp *)0 ||
|
|
strcmp(group, grouphead.grname)) {
|
|
__endnetgrent();
|
|
if (parse_netgrp(group))
|
|
__endnetgrent();
|
|
else {
|
|
grouphead.grname = (char *)
|
|
malloc(strlen(group) + 1);
|
|
strcpy(grouphead.grname, group);
|
|
}
|
|
}
|
|
nextgrp = grouphead.gr;
|
|
}
|
|
|
|
/*
|
|
* Get the next netgroup off the list.
|
|
*/
|
|
int
|
|
__getnetgrent(hostp, userp, domp)
|
|
char **hostp, **userp, **domp;
|
|
{
|
|
if (nextgrp) {
|
|
*hostp = nextgrp->ng_str[NG_HOST];
|
|
*userp = nextgrp->ng_str[NG_USER];
|
|
*domp = nextgrp->ng_str[NG_DOM];
|
|
nextgrp = nextgrp->ng_next;
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* __endnetgrent() - cleanup
|
|
*/
|
|
void
|
|
__endnetgrent()
|
|
{
|
|
register struct linelist *lp, *olp;
|
|
register struct netgrp *gp, *ogp;
|
|
|
|
lp = linehead;
|
|
while (lp) {
|
|
olp = lp;
|
|
lp = lp->l_next;
|
|
free(olp->l_groupname);
|
|
free(olp->l_line);
|
|
free((char *)olp);
|
|
}
|
|
linehead = (struct linelist *)0;
|
|
if (grouphead.grname) {
|
|
free(grouphead.grname);
|
|
grouphead.grname = (char *)0;
|
|
}
|
|
gp = grouphead.gr;
|
|
while (gp) {
|
|
ogp = gp;
|
|
gp = gp->ng_next;
|
|
if (ogp->ng_str[NG_HOST])
|
|
free(ogp->ng_str[NG_HOST]);
|
|
if (ogp->ng_str[NG_USER])
|
|
free(ogp->ng_str[NG_USER]);
|
|
if (ogp->ng_str[NG_DOM])
|
|
free(ogp->ng_str[NG_DOM]);
|
|
free((char *)ogp);
|
|
}
|
|
grouphead.gr = (struct netgrp *)0;
|
|
}
|
|
|
|
/*
|
|
* Parse the netgroup file setting up the linked lists.
|
|
*/
|
|
static int
|
|
parse_netgrp(group)
|
|
char *group;
|
|
{
|
|
register char *spos, *epos;
|
|
register int len, strpos;
|
|
#ifdef DEBUG
|
|
register int fields;
|
|
#endif
|
|
char *pos, *gpos;
|
|
struct netgrp *grp;
|
|
struct linelist *lp = linehead;
|
|
|
|
/*
|
|
* First, see if the line has already been read in.
|
|
*/
|
|
while (lp) {
|
|
if (!strcmp(group, lp->l_groupname))
|
|
break;
|
|
lp = lp->l_next;
|
|
}
|
|
if (lp == (struct linelist *)0 &&
|
|
(lp = read_for_group(group)) == (struct linelist *)0)
|
|
return (1);
|
|
if (lp->l_parsed) {
|
|
#ifdef DEBUG
|
|
/*
|
|
* This error message is largely superflous since the
|
|
* code handles the error condition sucessfully, and
|
|
* spewing it out from inside libc can actually hose
|
|
* certain programs.
|
|
*/
|
|
fprintf(stderr, "Cycle in netgroup %s\n", lp->l_groupname);
|
|
#endif
|
|
return (1);
|
|
} else
|
|
lp->l_parsed = 1;
|
|
pos = lp->l_line;
|
|
/* Watch for null pointer dereferences, dammit! */
|
|
while (pos != NULL && *pos != '\0') {
|
|
if (*pos == '(') {
|
|
grp = (struct netgrp *)malloc(sizeof (struct netgrp));
|
|
bzero((char *)grp, sizeof (struct netgrp));
|
|
grp->ng_next = grouphead.gr;
|
|
grouphead.gr = grp;
|
|
pos++;
|
|
gpos = strsep(&pos, ")");
|
|
#ifdef DEBUG
|
|
fields = 0;
|
|
#endif
|
|
for (strpos = 0; strpos < 3; strpos++) {
|
|
if ((spos = strsep(&gpos, ","))) {
|
|
#ifdef DEBUG
|
|
fields++;
|
|
#endif
|
|
while (*spos == ' ' || *spos == '\t')
|
|
spos++;
|
|
if ((epos = strpbrk(spos, " \t"))) {
|
|
*epos = '\0';
|
|
len = epos - spos;
|
|
} else
|
|
len = strlen(spos);
|
|
if (len > 0) {
|
|
grp->ng_str[strpos] = (char *)
|
|
malloc(len + 1);
|
|
bcopy(spos, grp->ng_str[strpos],
|
|
len + 1);
|
|
}
|
|
} else {
|
|
/*
|
|
* All other systems I've tested
|
|
* return NULL for empty netgroup
|
|
* fields. It's up to user programs
|
|
* to handle the NULLs appropriately.
|
|
*/
|
|
grp->ng_str[strpos] = NULL;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
/*
|
|
* Note: on other platforms, malformed netgroup
|
|
* entries are not normally flagged. While we
|
|
* can catch bad entries and report them, we should
|
|
* stay silent by default for compatibility's sake.
|
|
*/
|
|
if (fields < 3)
|
|
fprintf(stderr, "Bad entry (%s%s%s%s%s) in netgroup \"%s\"\n",
|
|
grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST],
|
|
grp->ng_str[NG_USER] == NULL ? "" : ",",
|
|
grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER],
|
|
grp->ng_str[NG_DOM] == NULL ? "" : ",",
|
|
grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM],
|
|
lp->l_groupname);
|
|
#endif
|
|
} else {
|
|
spos = strsep(&pos, ", \t");
|
|
if (parse_netgrp(spos))
|
|
continue;
|
|
}
|
|
/* Watch for null pointer dereferences, dammit! */
|
|
if (pos != NULL)
|
|
while (*pos == ' ' || *pos == ',' || *pos == '\t')
|
|
pos++;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Read the netgroup file and save lines until the line for the netgroup
|
|
* is found. Return 1 if eof is encountered.
|
|
*/
|
|
static struct linelist *
|
|
read_for_group(group)
|
|
char *group;
|
|
{
|
|
register char *pos, *spos, *linep = NULL, *olinep = NULL;
|
|
register int len, olen;
|
|
int cont;
|
|
struct linelist *lp;
|
|
char line[LINSIZ + 1];
|
|
char *data = NULL;
|
|
|
|
data = lookup (gtable, group);
|
|
sprintf(line, "%s %s", group, data);
|
|
pos = (char *)&line;
|
|
#ifdef CANT_HAPPEN
|
|
if (*pos == '#')
|
|
continue;
|
|
#endif
|
|
while (*pos == ' ' || *pos == '\t')
|
|
pos++;
|
|
spos = pos;
|
|
while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
|
|
*pos != '\0')
|
|
pos++;
|
|
len = pos - spos;
|
|
while (*pos == ' ' || *pos == '\t')
|
|
pos++;
|
|
if (*pos != '\n' && *pos != '\0') {
|
|
lp = (struct linelist *)malloc(sizeof (*lp));
|
|
lp->l_parsed = 0;
|
|
lp->l_groupname = (char *)malloc(len + 1);
|
|
bcopy(spos, lp->l_groupname, len);
|
|
*(lp->l_groupname + len) = '\0';
|
|
len = strlen(pos);
|
|
olen = 0;
|
|
/*
|
|
* Loop around handling line continuations.
|
|
*/
|
|
do {
|
|
if (*(pos + len - 1) == '\n')
|
|
len--;
|
|
if (*(pos + len - 1) == '\\') {
|
|
len--;
|
|
cont = 1;
|
|
} else
|
|
cont = 0;
|
|
if (len > 0) {
|
|
linep = (char *)malloc(olen + len + 1);
|
|
if (olen > 0) {
|
|
bcopy(olinep, linep, olen);
|
|
free(olinep);
|
|
}
|
|
bcopy(pos, linep + olen, len);
|
|
olen += len;
|
|
*(linep + olen) = '\0';
|
|
olinep = linep;
|
|
}
|
|
#ifdef CANT_HAPPEN
|
|
if (cont) {
|
|
if (fgets(line, LINSIZ, netf)) {
|
|
pos = line;
|
|
len = strlen(pos);
|
|
} else
|
|
cont = 0;
|
|
}
|
|
#endif
|
|
} while (cont);
|
|
lp->l_line = linep;
|
|
lp->l_next = linehead;
|
|
linehead = lp;
|
|
#ifdef CANT_HAPPEN
|
|
/*
|
|
* If this is the one we wanted, we are done.
|
|
*/
|
|
if (!strcmp(lp->l_groupname, group))
|
|
#endif
|
|
return (lp);
|
|
}
|
|
return ((struct linelist *)0);
|
|
}
|