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165 lines
5.3 KiB
C
165 lines
5.3 KiB
C
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/**
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* @file
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* DNS-SD APIs used by LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE
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*
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* This implementation assumes the DNS-SD API implementation (most likely provided by
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* mDNSResponder) is implemented in the same process space as LwIP and can directly
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* invoke the callback for DNSServiceGetAddrInfo. This is the typical deployment in
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* an embedded environment where as a traditional OS requires pumping the callback results
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* through an IPC mechanism (see DNSServiceRefSockFD/DNSServiceProcessResult)
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*
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* @defgroup dnssd DNS-SD
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* @ingroup dns
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*/
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/*
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* Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Joel Cunningham <joel.cunningham@me.com>
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/err.h"
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#include "lwip/inet.h"
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#include "lwip/sockets.h"
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#include "lwip/sys.h"
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#include "dnssd.h"
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/* External headers */
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#include <string.h>
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#include <dns_sd.h>
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/* This timeout should allow for multiple queries.
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mDNSResponder has the following query timeline:
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Query 1: time = 0s
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Query 2: time = 1s
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Query 3: time = 4s
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*/
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#define GETADDR_TIMEOUT_MS 5000
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#define LOCAL_DOMAIN ".local"
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/* Only consume .local hosts */
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#ifndef CONSUME_LOCAL_ONLY
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#define CONSUME_LOCAL_ONLY 1
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#endif
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struct addr_clbk_msg {
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sys_sem_t sem;
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struct sockaddr_storage addr;
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err_t err;
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};
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static void addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index,
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DNSServiceErrorType error_code, char const* hostname,
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const struct sockaddr* address, u32_t ttl, void* context);
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int
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lwip_dnssd_gethostbyname(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err)
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{
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DNSServiceErrorType result;
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DNSServiceRef ref;
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struct addr_clbk_msg msg;
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char *p;
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/* @todo: use with IPv6 */
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LWIP_UNUSED_ARG(addrtype);
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#if CONSUME_LOCAL_ONLY
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/* check if this is a .local host. If it is, then we consume the query */
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p = strstr(name, LOCAL_DOMAIN);
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if (p == NULL) {
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return 0; /* not consumed */
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}
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p += (sizeof(LOCAL_DOMAIN) - 1);
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/* check to make sure .local isn't a substring (only allow .local\0 or .local.\0) */
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if ((*p != '.' && *p != '\0') ||
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(*p == '.' && *(p + 1) != '\0')) {
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return 0; /* not consumed */
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}
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#endif /* CONSUME_LOCAL_ONLY */
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msg.err = sys_sem_new(&msg.sem, 0);
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if (msg.err != ERR_OK) {
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goto query_done;
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}
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msg.err = ERR_TIMEOUT;
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result = DNSServiceGetAddrInfo(&ref, 0, 0, kDNSServiceProtocol_IPv4, name, addr_info_callback, &msg);
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if (result == kDNSServiceErr_NoError) {
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sys_arch_sem_wait(&msg.sem, GETADDR_TIMEOUT_MS);
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DNSServiceRefDeallocate(ref);
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/* We got a response */
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if (msg.err == ERR_OK) {
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struct sockaddr_in* addr_in = (struct sockaddr_in *)&msg.addr;
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if (addr_in->sin_family == AF_INET) {
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inet_addr_to_ip4addr(ip_2_ip4(addr), &addr_in->sin_addr);
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} else {
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/* @todo add IPv6 support */
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msg.err = ERR_VAL;
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}
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}
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}
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sys_sem_free(&msg.sem);
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/* Query has been consumed and is finished */
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query_done:
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*err = msg.err;
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return 1;
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}
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static void
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addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index,
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DNSServiceErrorType error_code, char const* hostname,
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const struct sockaddr* address, u32_t ttl, void* context)
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{
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struct addr_clbk_msg* msg = (struct addr_clbk_msg*)context;
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struct sockaddr_in* addr_in = (struct sockaddr_in *)address;
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LWIP_UNUSED_ARG(ref);
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LWIP_UNUSED_ARG(flags);
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LWIP_UNUSED_ARG(interface_index);
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LWIP_UNUSED_ARG(hostname);
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LWIP_UNUSED_ARG(ttl);
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LWIP_UNUSED_ARG(context);
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if ((error_code == kDNSServiceErr_NoError) &&
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(addr_in->sin_family == AF_INET)) {
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MEMCPY(&msg->addr, addr_in, sizeof(*addr_in));
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msg->err = ERR_OK;
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}
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else {
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/* @todo add IPv6 support */
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msg->err = ERR_VAL;
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}
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sys_sem_signal(&msg->sem);
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} /* addr_info_callback() */
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