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/*
* Unix SMB/CIFS implementation.
* Internal DNS query structures
* Copyright (C) Volker Lendecke 2018
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include <stdio.h>
#include <errno.h>
#include "libcli/dns/resolvconf.h"
#include "lib/util/memory.h"
int parse_resolvconf_fp(
FILE *fp,
TALLOC_CTX *mem_ctx,
char ***pnameservers,
size_t *pnum_nameservers)
{
char *line = NULL;
size_t len = 0;
char **nameservers = NULL;
size_t num_nameservers = 0;
int ret = 0;
while (true) {
char *saveptr = NULL, *option = NULL, *ns = NULL;
char **tmp = NULL;
ssize_t n = 0;
n = getline(&line, &len, fp);
if (n < 0) {
if (!feof(fp)) {
/* real error */
ret = errno;
}
break;
}
if ((n > 0) && (line[n-1] == '\n')) {
line[n-1] = '\0';
}
if ((line[0] == '#') || (line[0] == ';')) {
continue;
}
option = strtok_r(line, " \t", &saveptr);
if (option == NULL) {
continue;
}
if (strcmp(option, "nameserver") != 0) {
continue;
}
ns = strtok_r(NULL, " \t", &saveptr);
if (ns == NULL) {
continue;
}
tmp = talloc_realloc(
mem_ctx,
nameservers,
char *,
num_nameservers+1);
if (tmp == NULL) {
ret = ENOMEM;
break;
}
nameservers = tmp;
nameservers[num_nameservers] = talloc_strdup(nameservers, ns);
if (nameservers[num_nameservers] == NULL) {
ret = ENOMEM;
break;
}
num_nameservers += 1;
}
SAFE_FREE(line);
if (ret == 0) {
*pnameservers = nameservers;
*pnum_nameservers = num_nameservers;
} else {
TALLOC_FREE(nameservers);
}
return ret;
}
int parse_resolvconf(
const char *resolvconf,
TALLOC_CTX *mem_ctx,
char ***pnameservers,
size_t *pnum_nameservers)
{
FILE *fp;
int ret;
fp = fopen(resolvconf ? resolvconf : "/etc/resolv.conf", "r");
if (fp == NULL) {
return errno;
}
ret = parse_resolvconf_fp(fp, mem_ctx, pnameservers, pnum_nameservers);
fclose(fp);
return ret;
}
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