291 lines
8.2 KiB
C
291 lines
8.2 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsforeach.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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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 <ctype.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <arpa/inet.h>
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#include <nuttx/net/dns.h>
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#include "netdb/lib_dns.h"
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#ifdef CONFIG_NETDB_DNSCLIENT
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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#ifdef CONFIG_NETDB_RESOLVCONF
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static FAR char *skip_spaces(FAR char *ptr)
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{
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while (isspace(*ptr)) ptr++;
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return ptr;
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}
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static FAR char *find_spaces(FAR char *ptr)
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{
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while (*ptr && !isspace(*ptr)) ptr++;
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return ptr;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dns_foreach_nameserver
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*
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* Description:
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* Traverse each nameserver entry in the resolv.conf file and perform the
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* the provided callback.
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*
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****************************************************************************/
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#ifdef CONFIG_NETDB_RESOLVCONF
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int dns_foreach_nameserver(dns_callback_t callback, FAR void *arg)
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{
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union dns_addr_u u;
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FAR FILE *stream;
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char line[DNS_MAX_LINE];
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FAR char *addrstr;
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FAR char *ptr;
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uint16_t port;
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int keylen;
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int ret;
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/* Open the resolver configuration file */
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stream = fopen(CONFIG_NETDB_RESOLVCONF_PATH, "r");
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if (stream == NULL)
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{
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ret = -errno;
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nerr("ERROR: Failed to open %s: %d\n",
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CONFIG_NETDB_RESOLVCONF_PATH, ret);
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DEBUGASSERT(ret < 0);
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return ret;
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}
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keylen = strlen(NETDB_DNS_KEYWORD);
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while (fgets(line, DNS_MAX_LINE, stream) != NULL)
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{
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ptr = skip_spaces(line);
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if (strncmp(ptr, NETDB_DNS_KEYWORD, keylen) == 0)
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{
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/* Skip over the 'nameserver' keyword */
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ptr = find_spaces(ptr);
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addrstr = skip_spaces(ptr);
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if (*addrstr == '\0')
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{
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nerr("ERROR: Missing address in %s record\n",
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CONFIG_NETDB_RESOLVCONF_PATH);
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continue;
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}
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/* Make sure that the address string is NUL terminated and
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* not followed by garbage.
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*/
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ptr = find_spaces(addrstr);
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*ptr = '\0';
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/* Convert the address string to a binary representation. */
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port = HTONS(DNS_DEFAULT_PORT);
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#ifdef CONFIG_NETDB_RESOLVCONF_NONSTDPORT
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/* The OpenBSD version supports a [host]:port syntax. When a
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* non-standard port is specified the host address must be
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* enclosed in square brackets. For example:
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*
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* nameserver [10.0.0.1]:5353
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* nameserver [::1]:5353
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*/
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if (*addrstr == '[')
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{
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/* Make sure that there is a right bracket */
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ptr = strchr(addrstr, ']');
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if (ptr == NULL)
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{
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nerr("ERROR: Missing right bracket after %s\n", line);
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continue;
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}
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/* Replace the right bracket with a NULL terminator */
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addrstr++;
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*ptr++ = '\0';
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/* Get the port number following the right bracket */
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if (*ptr++ == ':')
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{
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FAR char *portstr;
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int tmp;
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/* Isolate the port string */
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portstr = ptr;
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ptr = find_spaces(ptr);
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*ptr = '\0';
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/* Get the port number */
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tmp = atoi(portstr);
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if (tmp != 0)
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{
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port = htons(tmp);
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}
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}
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}
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#endif /* CONFIG_NETDB_RESOLVCONF_NONSTDPORT */
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#ifdef CONFIG_NET_IPv4
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/* Try to convert the IPv4 address */
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ret = inet_pton(AF_INET, addrstr, &u.ipv4.sin_addr);
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/* The inet_pton() function returns 1 if the conversion succeeds */
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if (ret == 1)
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{
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u.ipv4.sin_family = AF_INET;
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u.ipv4.sin_port = port;
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ret = callback(arg, (FAR struct sockaddr *)&u.ipv4,
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sizeof(struct sockaddr_in));
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}
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else
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#endif
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#ifdef CONFIG_NET_IPv6
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{
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/* Try to convert the IPv6 address */
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ret = inet_pton(AF_INET6, addrstr, &u.ipv6.sin6_addr);
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/* The inet_pton() function returns 1 if the conversion
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* succeeds.
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*/
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if (ret == 1)
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{
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u.ipv6.sin6_family = AF_INET6;
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u.ipv6.sin6_port = port;
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ret = callback(arg, (FAR struct sockaddr *)&u.ipv6,
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sizeof(struct sockaddr_in6));
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}
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else
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#endif
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{
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nerr("ERROR: Unrecognized address: %s\n", addrstr)
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ret = OK;
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}
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#ifdef CONFIG_NET_IPv6
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}
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#endif
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if (ret != OK)
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{
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fclose(stream);
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return ret;
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}
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}
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}
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fclose(stream);
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return OK;
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}
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#else /* CONFIG_NETDB_RESOLVCONF */
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int dns_foreach_nameserver(dns_callback_t callback, FAR void *arg)
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{
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int ret = OK;
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if (g_dns_address)
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{
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#ifdef CONFIG_NET_IPv4
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/* Check for an IPv4 address */
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if (g_dns_server.addr.sa_family == AF_INET)
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{
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/* Perform the callback */
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ret = callback(arg, (FAR struct sockaddr *)&g_dns_server.ipv4,
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sizeof(struct sockaddr_in));
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}
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else
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#endif
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#ifdef CONFIG_NET_IPv6
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/* Check for an IPv6 address */
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if (g_dns_server.addr.sa_family == AF_INET6)
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{
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/* Perform the callback */
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ret = callback(arg, (FAR struct sockaddr *)&g_dns_server.ipv6,
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sizeof(struct sockaddr_in6));
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}
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else
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#endif
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{
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nerr("ERROR: Unsupported family: %d\n",
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g_dns_server.addr.sa_family);
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ret = -ENOSYS;
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}
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}
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return ret;
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}
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#endif /* CONFIG_NETDB_RESOLVCONF */
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#endif /* CONFIG_NETDB_DNSCLIENT */
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