[457] | 1 | /**
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| 2 | * @file
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| 3 | * DNS-SD APIs used by LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE
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| 4 | *
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| 5 | * This implementation assumes the DNS-SD API implementation (most likely provided by
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| 6 | * mDNSResponder) is implemented in the same process space as LwIP and can directly
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| 7 | * invoke the callback for DNSServiceGetAddrInfo. This is the typical deployment in
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| 8 | * an embedded environment where as a traditional OS requires pumping the callback results
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| 9 | * through an IPC mechanism (see DNSServiceRefSockFD/DNSServiceProcessResult)
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| 10 | *
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| 11 | * @defgroup dnssd DNS-SD
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| 12 | * @ingroup dns
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| 13 | */
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| 14 |
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| 15 | /*
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| 16 | * Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com>
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| 17 | * All rights reserved.
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| 18 | *
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| 19 | * Redistribution and use in source and binary forms, with or without modification,
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| 20 | * are permitted provided that the following conditions are met:
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| 21 | *
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| 22 | * 1. Redistributions of source code must retain the above copyright notice,
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| 23 | * this list of conditions and the following disclaimer.
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| 24 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 25 | * this list of conditions and the following disclaimer in the documentation
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| 26 | * and/or other materials provided with the distribution.
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| 27 | * 3. The name of the author may not be used to endorse or promote products
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| 28 | * derived from this software without specific prior written permission.
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| 29 | *
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| 30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 31 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 32 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 33 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 34 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 35 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 36 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 37 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 38 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 39 | * OF SUCH DAMAGE.
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| 40 | *
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| 41 | * This file is part of the lwIP TCP/IP stack.
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| 42 | *
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| 43 | * Author: Joel Cunningham <joel.cunningham@me.com>
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| 44 | *
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| 45 | */
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| 46 | #include "lwip/opt.h"
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| 47 |
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| 48 | #include "lwip/err.h"
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| 49 | #include "lwip/inet.h"
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| 50 | #include "lwip/sockets.h"
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| 51 | #include "lwip/sys.h"
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| 52 |
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| 53 | #include "dnssd.h"
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| 54 |
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| 55 | /* External headers */
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| 56 | #include <string.h>
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| 57 | #include <dns_sd.h>
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| 58 |
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| 59 | /* This timeout should allow for multiple queries.
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| 60 | mDNSResponder has the following query timeline:
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| 61 | Query 1: time = 0s
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| 62 | Query 2: time = 1s
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| 63 | Query 3: time = 4s
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| 64 | */
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| 65 | #define GETADDR_TIMEOUT_MS 5000
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| 66 | #define LOCAL_DOMAIN ".local"
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| 67 |
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| 68 | /* Only consume .local hosts */
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| 69 | #ifndef CONSUME_LOCAL_ONLY
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| 70 | #define CONSUME_LOCAL_ONLY 1
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| 71 | #endif
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| 72 |
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| 73 | struct addr_clbk_msg {
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| 74 | sys_sem_t sem;
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| 75 | struct sockaddr_storage addr;
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| 76 | err_t err;
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| 77 | };
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| 78 |
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| 79 | static void addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index,
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| 80 | DNSServiceErrorType error_code, char const* hostname,
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| 81 | const struct sockaddr* address, u32_t ttl, void* context);
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| 82 |
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| 83 | int
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| 84 | lwip_dnssd_gethostbyname(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err)
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| 85 | {
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| 86 | DNSServiceErrorType result;
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| 87 | DNSServiceRef ref;
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| 88 | struct addr_clbk_msg msg;
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| 89 | char *p;
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| 90 |
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| 91 | /* @todo: use with IPv6 */
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| 92 | LWIP_UNUSED_ARG(addrtype);
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| 93 |
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| 94 | #if CONSUME_LOCAL_ONLY
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| 95 | /* check if this is a .local host. If it is, then we consume the query */
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| 96 | p = strstr(name, LOCAL_DOMAIN);
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| 97 | if (p == NULL) {
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| 98 | return 0; /* not consumed */
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| 99 | }
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| 100 | p += (sizeof(LOCAL_DOMAIN) - 1);
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| 101 | /* check to make sure .local isn't a substring (only allow .local\0 or .local.\0) */
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| 102 | if ((*p != '.' && *p != '\0') ||
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| 103 | (*p == '.' && *(p + 1) != '\0')) {
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| 104 | return 0; /* not consumed */
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| 105 | }
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| 106 | #endif /* CONSUME_LOCAL_ONLY */
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| 107 |
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| 108 | msg.err = sys_sem_new(&msg.sem, 0);
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| 109 | if (msg.err != ERR_OK) {
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| 110 | goto query_done;
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| 111 | }
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| 112 |
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| 113 | msg.err = ERR_TIMEOUT;
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| 114 | result = DNSServiceGetAddrInfo(&ref, 0, 0, kDNSServiceProtocol_IPv4, name, addr_info_callback, &msg);
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| 115 | if (result == kDNSServiceErr_NoError) {
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| 116 | sys_arch_sem_wait(&msg.sem, GETADDR_TIMEOUT_MS);
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| 117 | DNSServiceRefDeallocate(ref);
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| 118 |
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| 119 | /* We got a response */
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| 120 | if (msg.err == ERR_OK) {
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| 121 | struct sockaddr_in* addr_in = (struct sockaddr_in *)&msg.addr;
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| 122 | if (addr_in->sin_family == AF_INET) {
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| 123 | inet_addr_to_ip4addr(ip_2_ip4(addr), &addr_in->sin_addr);
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| 124 | } else {
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| 125 | /* @todo add IPv6 support */
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| 126 | msg.err = ERR_VAL;
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| 127 | }
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| 128 | }
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| 129 | }
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| 130 | sys_sem_free(&msg.sem);
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| 131 |
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| 132 | /* Query has been consumed and is finished */
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| 133 | query_done:
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| 134 | *err = msg.err;
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| 135 | return 1;
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| 136 | }
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| 137 |
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| 138 | static void
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| 139 | addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index,
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| 140 | DNSServiceErrorType error_code, char const* hostname,
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| 141 | const struct sockaddr* address, u32_t ttl, void* context)
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| 142 | {
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| 143 | struct addr_clbk_msg* msg = (struct addr_clbk_msg*)context;
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| 144 | struct sockaddr_in* addr_in = (struct sockaddr_in *)address;
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| 145 |
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| 146 | LWIP_UNUSED_ARG(ref);
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| 147 | LWIP_UNUSED_ARG(flags);
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| 148 | LWIP_UNUSED_ARG(interface_index);
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| 149 | LWIP_UNUSED_ARG(hostname);
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| 150 | LWIP_UNUSED_ARG(ttl);
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| 151 | LWIP_UNUSED_ARG(context);
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| 152 |
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| 153 | if ((error_code == kDNSServiceErr_NoError) &&
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| 154 | (addr_in->sin_family == AF_INET)) {
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| 155 | MEMCPY(&msg->addr, addr_in, sizeof(*addr_in));
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| 156 | msg->err = ERR_OK;
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| 157 | }
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| 158 | else {
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| 159 | /* @todo add IPv6 support */
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| 160 | msg->err = ERR_VAL;
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| 161 | }
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| 162 |
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| 163 | sys_sem_signal(&msg->sem);
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| 164 | } /* addr_info_callback() */
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