aboutsummaryrefslogtreecommitdiff
path: root/libexec/revnetgroup/parse_netgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'libexec/revnetgroup/parse_netgroup.c')
-rw-r--r--libexec/revnetgroup/parse_netgroup.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/libexec/revnetgroup/parse_netgroup.c b/libexec/revnetgroup/parse_netgroup.c
new file mode 100644
index 000000000000..3d6a7939fa1d
--- /dev/null
+++ b/libexec/revnetgroup/parse_netgroup.c
@@ -0,0 +1,357 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * 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. 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.
+ */
+
+/*
+ * 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 <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "hash.h"
+
+/*
+ * 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(char *group);
+static struct linelist *read_for_group(char *group);
+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(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(char **hostp, char **userp, char **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(void)
+{
+ struct linelist *lp, *olp;
+ 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(char *group)
+{
+ char *spos, *epos;
+ int len, strpos;
+#ifdef DEBUG
+ 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 superfluous since the
+ * code handles the error condition successfully, and
+ * spewing it out from inside libc can actually hose
+ * certain programs.
+ */
+ warnx("cycle in netgroup %s", 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)
+ warnx("bad entry (%s%s%s%s%s) in netgroup \"%s\"",
+ 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(char *group)
+{
+ char *pos, *spos, *linep = NULL, *olinep = NULL;
+ 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-12 19:06:36 +0000