172 lines
5.8 KiB
C
172 lines
5.8 KiB
C
/*
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* mDNS registration handler. This file is part of Shairport.
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* Copyright (c) Paul Lietar 2013
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "mdns.h"
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#include "common.h"
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#include <ifaddrs.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "tinysvcmdns.h"
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static struct mdnsd *svr = NULL;
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static int mdns_tinysvcmdns_register(char *ap1name, __attribute__((unused)) char *ap2name, int port,
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__attribute__((unused)) char **txt_records,
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__attribute__((unused)) char **secondary_txt_records) {
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struct ifaddrs *ifalist;
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struct ifaddrs *ifa;
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svr = mdnsd_start();
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if (svr == NULL) {
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warn("tinysvcmdns: mdnsd_start() failed");
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return -1;
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}
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// Thanks to Paul Lietar for this
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// room for name + .local + NULL
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char hostname[100 + 6];
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gethostname(hostname, 99);
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// according to POSIX, this may be truncated without a final NULL !
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hostname[99] = 0;
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// will not work if the hostname doesn't end in .local
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char *hostend = hostname + strlen(hostname);
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if ((strlen(hostname) < strlen(".local")) || (strcmp(hostend - 6, ".local") != 0)) {
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strcat(hostname, ".local");
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}
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if (getifaddrs(&ifalist) < 0) {
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warn("tinysvcmdns: getifaddrs() failed");
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return -1;
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}
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ifa = ifalist;
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// Look for an ipv4/ipv6 non-loopback interface to use as the main one.
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for (ifa = ifalist; ifa != NULL; ifa = ifa->ifa_next) {
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// only check for the named interface, if specified
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if ((config.interface == NULL) || (strcmp(config.interface, ifa->ifa_name) == 0)) {
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if (!(ifa->ifa_flags & IFF_LOOPBACK) && ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_INET) {
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uint32_t main_ip = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
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mdnsd_set_hostname(svr, hostname, main_ip); // TTL should be 120 seconds
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break;
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} else if (!(ifa->ifa_flags & IFF_LOOPBACK) && ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_INET6) {
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struct in6_addr *addr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
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mdnsd_set_hostname_v6(svr, hostname, addr); // TTL should be 120 seconds
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break;
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}
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}
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}
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if (ifa == NULL) {
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warn("tinysvcmdns: no non-loopback ipv4 or ipv6 interface found");
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return -1;
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}
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// Skip the first one, it was already added by set_hostname
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for (ifa = ifa->ifa_next; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_flags & IFF_LOOPBACK) // Skip loop-back interfaces
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continue;
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// only check for the named interface, if specified
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if ((config.interface == NULL) || (strcmp(config.interface, ifa->ifa_name) == 0)) {
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switch (ifa->ifa_addr->sa_family) {
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case AF_INET: { // ipv4
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uint32_t ip = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
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struct rr_entry *a_e =
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rr_create_a(create_nlabel(hostname), ip); // TTL should be 120 seconds
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mdnsd_add_rr(svr, a_e);
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} break;
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case AF_INET6: { // ipv6
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struct in6_addr *addr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
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struct rr_entry *aaaa_e =
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rr_create_aaaa(create_nlabel(hostname), addr); // TTL should be 120 seconds
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mdnsd_add_rr(svr, aaaa_e);
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} break;
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}
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}
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}
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freeifaddrs(ifa);
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char *txtwithoutmetadata[] = {MDNS_RECORD_WITHOUT_METADATA, NULL};
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#ifdef CONFIG_METADATA
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char *txtwithmetadata[] = {MDNS_RECORD_WITH_METADATA, NULL};
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#endif
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char **txt;
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#ifdef CONFIG_METADATA
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if (config.metadata_enabled)
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txt = txtwithmetadata;
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else
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#endif
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txt = txtwithoutmetadata;
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if (config.regtype == NULL)
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die("tinysvcmdns: regtype is null");
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char *extendedregtype = malloc(strlen(config.regtype) + strlen(".local") + 1);
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if (extendedregtype == NULL)
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die("tinysvcmdns: could not allocated memory to request a Zeroconf service");
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strcpy(extendedregtype, config.regtype);
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strcat(extendedregtype, ".local");
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struct mdns_service *svc =
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mdnsd_register_svc(svr, ap1name, extendedregtype, port, NULL,
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(const char **)txt); // TTL should be 75 minutes, i.e. 4500 seconds
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mdns_service_destroy(svc);
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free(extendedregtype);
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return 0;
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}
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static void mdns_tinysvcmdns_unregister(void) {
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if (svr) {
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mdnsd_stop(svr);
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svr = NULL;
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}
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}
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mdns_backend mdns_tinysvcmdns = {.name = "tinysvcmdns",
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.mdns_register = mdns_tinysvcmdns_register,
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.mdns_unregister = mdns_tinysvcmdns_unregister,
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.mdns_dacp_monitor_start = NULL,
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.mdns_dacp_monitor_set_id = NULL,
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.mdns_dacp_monitor_stop = NULL};
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