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https://github.com/samba-team/samba.git
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bcb2752125
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Internal DNS query structures
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* Copyright (C) Volker Lendecke 2018
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include <stdio.h>
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#include <errno.h>
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#include "libcli/dns/resolvconf.h"
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#include "lib/util/memory.h"
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int parse_resolvconf_fp(
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FILE *fp,
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TALLOC_CTX *mem_ctx,
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char ***pnameservers,
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size_t *pnum_nameservers)
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{
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char *line = NULL;
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size_t len = 0;
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char **nameservers = NULL;
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size_t num_nameservers = 0;
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int ret = 0;
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while (true) {
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char *saveptr = NULL, *option = NULL, *ns = NULL;
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char **tmp = NULL;
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ssize_t n = 0;
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n = getline(&line, &len, fp);
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if (n < 0) {
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if (!feof(fp)) {
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/* real error */
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ret = errno;
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}
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break;
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}
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if ((n > 0) && (line[n-1] == '\n')) {
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line[n-1] = '\0';
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}
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if ((line[0] == '#') || (line[0] == ';')) {
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continue;
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}
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option = strtok_r(line, " \t", &saveptr);
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if (option == NULL) {
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continue;
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}
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if (strcmp(option, "nameserver") != 0) {
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continue;
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}
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ns = strtok_r(NULL, " \t", &saveptr);
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if (ns == NULL) {
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continue;
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}
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tmp = talloc_realloc(
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mem_ctx,
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nameservers,
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char *,
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num_nameservers+1);
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if (tmp == NULL) {
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ret = ENOMEM;
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break;
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}
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nameservers = tmp;
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nameservers[num_nameservers] = talloc_strdup(nameservers, ns);
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if (nameservers[num_nameservers] == NULL) {
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ret = ENOMEM;
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break;
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}
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num_nameservers += 1;
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}
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SAFE_FREE(line);
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if (ret == 0) {
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*pnameservers = nameservers;
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*pnum_nameservers = num_nameservers;
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} else {
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TALLOC_FREE(nameservers);
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}
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return ret;
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}
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int parse_resolvconf(
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const char *resolvconf,
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TALLOC_CTX *mem_ctx,
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char ***pnameservers,
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size_t *pnum_nameservers)
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{
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FILE *fp;
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int ret;
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fp = fopen(resolvconf ? resolvconf : "/etc/resolv.conf", "r");
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if (fp == NULL) {
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return errno;
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}
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ret = parse_resolvconf_fp(fp, mem_ctx, pnameservers, pnum_nameservers);
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fclose(fp);
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return ret;
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}
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