diff options
Diffstat (limited to 'contrib/addons/netconn/external_resolve/dnssd.c')
| -rw-r--r-- | contrib/addons/netconn/external_resolve/dnssd.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/contrib/addons/netconn/external_resolve/dnssd.c b/contrib/addons/netconn/external_resolve/dnssd.c new file mode 100644 index 00000000000..d26743bc65c --- /dev/null +++ b/contrib/addons/netconn/external_resolve/dnssd.c @@ -0,0 +1,164 @@ +/** + * @file + * DNS-SD APIs used by LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE + * + * This implementation assumes the DNS-SD API implementation (most likely provided by + * mDNSResponder) is implemented in the same process space as LwIP and can directly + * invoke the callback for DNSServiceGetAddrInfo. This is the typical deployment in + * an embedded environment where as a traditional OS requires pumping the callback results + * through an IPC mechanism (see DNSServiceRefSockFD/DNSServiceProcessResult) + * + * @defgroup dnssd DNS-SD + * @ingroup dns + */ + +/* + * Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * This file is part of the lwIP TCP/IP stack. + * + * Author: Joel Cunningham <joel.cunningham@me.com> + * + */ +#include "lwip/opt.h" + +#include "lwip/err.h" +#include "lwip/inet.h" +#include "lwip/sockets.h" +#include "lwip/sys.h" + +#include "dnssd.h" + +/* External headers */ +#include <string.h> +#include <dns_sd.h> + +/* This timeout should allow for multiple queries. +mDNSResponder has the following query timeline: + Query 1: time = 0s + Query 2: time = 1s + Query 3: time = 4s +*/ +#define GETADDR_TIMEOUT_MS 5000 +#define LOCAL_DOMAIN ".local" + +/* Only consume .local hosts */ +#ifndef CONSUME_LOCAL_ONLY +#define CONSUME_LOCAL_ONLY 1 +#endif + +struct addr_clbk_msg { + sys_sem_t sem; + struct sockaddr_storage addr; + err_t err; +}; + +static void addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index, + DNSServiceErrorType error_code, char const* hostname, + const struct sockaddr* address, u32_t ttl, void* context); + +int +lwip_dnssd_gethostbyname(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err) +{ + DNSServiceErrorType result; + DNSServiceRef ref; + struct addr_clbk_msg msg; + char *p; + + /* @todo: use with IPv6 */ + LWIP_UNUSED_ARG(addrtype); + +#if CONSUME_LOCAL_ONLY + /* check if this is a .local host. If it is, then we consume the query */ + p = strstr(name, LOCAL_DOMAIN); + if (p == NULL) { + return 0; /* not consumed */ + } + p += (sizeof(LOCAL_DOMAIN) - 1); + /* check to make sure .local isn't a substring (only allow .local\0 or .local.\0) */ + if ((*p != '.' && *p != '\0') || + (*p == '.' && *(p + 1) != '\0')) { + return 0; /* not consumed */ + } +#endif /* CONSUME_LOCAL_ONLY */ + + msg.err = sys_sem_new(&msg.sem, 0); + if (msg.err != ERR_OK) { + goto query_done; + } + + msg.err = ERR_TIMEOUT; + result = DNSServiceGetAddrInfo(&ref, 0, 0, kDNSServiceProtocol_IPv4, name, addr_info_callback, &msg); + if (result == kDNSServiceErr_NoError) { + sys_arch_sem_wait(&msg.sem, GETADDR_TIMEOUT_MS); + DNSServiceRefDeallocate(ref); + + /* We got a response */ + if (msg.err == ERR_OK) { + struct sockaddr_in* addr_in = (struct sockaddr_in *)&msg.addr; + if (addr_in->sin_family == AF_INET) { + inet_addr_to_ip4addr(ip_2_ip4(addr), &addr_in->sin_addr); + } else { + /* @todo add IPv6 support */ + msg.err = ERR_VAL; + } + } + } + sys_sem_free(&msg.sem); + +/* Query has been consumed and is finished */ +query_done: +*err = msg.err; +return 1; +} + +static void +addr_info_callback(DNSServiceRef ref, DNSServiceFlags flags, u32_t interface_index, + DNSServiceErrorType error_code, char const* hostname, + const struct sockaddr* address, u32_t ttl, void* context) +{ + struct addr_clbk_msg* msg = (struct addr_clbk_msg*)context; + struct sockaddr_in* addr_in = (struct sockaddr_in *)address; + + LWIP_UNUSED_ARG(ref); + LWIP_UNUSED_ARG(flags); + LWIP_UNUSED_ARG(interface_index); + LWIP_UNUSED_ARG(hostname); + LWIP_UNUSED_ARG(ttl); + LWIP_UNUSED_ARG(context); + + if ((error_code == kDNSServiceErr_NoError) && + (addr_in->sin_family == AF_INET)) { + MEMCPY(&msg->addr, addr_in, sizeof(*addr_in)); + msg->err = ERR_OK; + } + else { + /* @todo add IPv6 support */ + msg->err = ERR_VAL; + } + + sys_sem_signal(&msg->sem); +} /* addr_info_callback() */ |