Bump mdns 2015.09.03
This commit is contained in:
jbnadal
390
src/3P/mdns/service.c
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390
src/3P/mdns/service.c
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/*
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* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <sys/types.h>
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#include <arpa/nameser.h>
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#include <sys/socket.h>
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#include <ifaddrs.h>
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#include <resolv.h>
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#include <glob.h>
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#include <stdio.h>
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#include <time.h>
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#include <libubus.h>
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#include <libubox/vlist.h>
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#include <libubox/uloop.h>
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#include <libubox/avl-cmp.h>
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#include <libubox/blobmsg_json.h>
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#include "ubus.h"
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#include "dns.h"
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#include "service.h"
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#include "util.h"
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#include "interface.h"
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#include "announce.h"
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enum {
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SERVICE_SERVICE,
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SERVICE_PORT,
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SERVICE_TXT,
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__SERVICE_MAX,
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};
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struct service {
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struct vlist_node node;
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time_t t;
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const char *id;
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const char *service;
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const uint8_t *txt;
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int txt_len;
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int port;
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int active;
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};
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static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
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[SERVICE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
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[SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
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[SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
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};
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static void
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service_update(struct vlist_tree *tree, struct vlist_node *node_new,
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struct vlist_node *node_old);
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static struct blob_buf b;
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static VLIST_TREE(services, avl_strcmp, service_update, false, false);
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static char *sdudp = "_services._dns-sd._udp.local";
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static char *sdtcp = "_services._dns-sd._tcp.local";
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static int service_init_announce;
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static const char *
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service_name(const char *domain)
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{
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static char buffer[256];
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snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
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return buffer;
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}
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static void
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service_add_ptr(const char *host, int ttl)
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{
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int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
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if (len < 1)
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return;
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dns_add_answer(TYPE_PTR, mdns_buf, len, ttl);
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}
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static void
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service_add_srv(struct service *s, int ttl)
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{
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struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
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int len = sizeof(*sd);
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len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
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if (len <= sizeof(*sd))
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return;
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sd->port = cpu_to_be16(s->port);
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dns_add_answer(TYPE_SRV, mdns_buf, len, ttl);
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}
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#define TOUT_LOOKUP 60
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static int
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service_timeout(struct service *s)
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{
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time_t t = monotonic_time();
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if (t - s->t <= TOUT_LOOKUP)
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return 0;
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s->t = t;
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return 1;
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}
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void
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service_reply_a(struct interface *iface, int ttl)
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{
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struct ifaddrs *ifap, *ifa;
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struct sockaddr_in *sa;
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struct sockaddr_in6 *sa6;
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getifaddrs(&ifap);
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dns_init_answer();
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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if (strcmp(ifa->ifa_name, iface->name))
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continue;
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if (ifa->ifa_addr->sa_family == AF_INET) {
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sa = (struct sockaddr_in *) ifa->ifa_addr;
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dns_add_answer(TYPE_A, (uint8_t *) &sa->sin_addr, 4, ttl);
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}
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if (ifa->ifa_addr->sa_family == AF_INET6) {
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uint8_t ll_prefix[] = {0xfe, 0x80 };
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sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
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if (!memcmp(&sa6->sin6_addr, &ll_prefix, 2))
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dns_add_answer(TYPE_AAAA, (uint8_t *) &sa6->sin6_addr, 16, ttl);
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}
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}
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dns_send_answer(iface, mdns_hostname_local);
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freeifaddrs(ifap);
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}
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static void
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service_reply_single(struct interface *iface, struct service *s, const char *match, int ttl, int force)
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{
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const char *host = service_name(s->service);
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char *service = strstr(host, "._");
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if (!force && (!s->active || !service || !service_timeout(s)))
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return;
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service++;
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if (match && strcmp(match, s->service))
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return;
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dns_init_answer();
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service_add_ptr(service_name(s->service), ttl);
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dns_send_answer(iface, service);
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dns_init_answer();
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service_add_srv(s, ttl);
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if (s->txt && s->txt_len)
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dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
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dns_send_answer(iface, host);
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}
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void
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service_reply(struct interface *iface, const char *match, int ttl)
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{
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struct service *s;
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vlist_for_each_element(&services, s, node)
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service_reply_single(iface, s, match, ttl, 0);
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if (match)
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return;
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if (ttl)
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service_reply_a(iface, ttl);
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}
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void
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service_announce_services(struct interface *iface, const char *service, int ttl)
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{
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struct service *s;
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int tcp = 1;
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if (!strcmp(service, sdudp))
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tcp = 0;
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else if (strcmp(service, sdtcp))
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return;
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vlist_for_each_element(&services, s, node) {
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if (!strstr(s->service, "._tcp") && tcp)
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continue;
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if (!strstr(s->service, "._udp") && !tcp)
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continue;
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s->t = 0;
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if (ttl) {
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dns_init_answer();
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service_add_ptr(s->service, ttl);
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if (tcp)
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dns_send_answer(iface, sdtcp);
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else
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dns_send_answer(iface, sdudp);
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}
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service_reply(iface, s->service, ttl);
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}
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}
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void
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service_announce(struct interface *iface, int ttl)
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{
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service_announce_services(iface, sdudp, ttl);
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service_announce_services(iface, sdtcp, ttl);
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}
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static void
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service_update(struct vlist_tree *tree, struct vlist_node *node_new,
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struct vlist_node *node_old)
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{
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struct interface *iface;
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struct service *s;
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if (!node_old) {
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s = container_of(node_new, struct service, node);
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if (service_init_announce)
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vlist_for_each_element(&interfaces, iface, node) {
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s->t = 0;
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service_reply_single(iface, s, NULL, announce_ttl, 1);
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}
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return;
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}
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s = container_of(node_old, struct service, node);
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if (!node_new && service_init_announce)
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vlist_for_each_element(&interfaces, iface, node)
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service_reply_single(iface, s, NULL, 0, 1);
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free(s);
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}
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static void
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service_load_blob(struct blob_attr *b)
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{
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struct blob_attr *txt, *_tb[__SERVICE_MAX];
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struct service *s;
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char *d_service, *d_id;
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uint8_t *d_txt;
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int rem2;
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int txt_len = 0;
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blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
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_tb, blobmsg_data(b), blobmsg_data_len(b));
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if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
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return;
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if (_tb[SERVICE_SERVICE])
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blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
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txt_len += 1 + strlen(blobmsg_get_string(txt));
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s = calloc_a(sizeof(*s),
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&d_id, strlen(blobmsg_name(b)) + 1,
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&d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
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&d_txt, txt_len);
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if (!s)
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return;
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s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
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s->id = strcpy(d_id, blobmsg_name(b));
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s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
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s->active = 1;
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s->t = 0;
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s->txt_len = txt_len;
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s->txt = d_txt;
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if (_tb[SERVICE_SERVICE])
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blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
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int len = strlen(blobmsg_get_string(txt));
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if (!len)
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return;
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if (len > 0xff)
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len = 0xff;
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*d_txt = len;
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d_txt++;
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memcpy(d_txt, blobmsg_get_string(txt), len);
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d_txt += len;
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}
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vlist_add(&services, &s->node, s->id);
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}
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static void
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service_load(char *path)
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{
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struct blob_attr *cur;
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glob_t gl;
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int i, rem;
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if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
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return;
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for (i = 0; i < gl.gl_pathc; i++) {
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blob_buf_init(&b, 0);
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if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
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blob_for_each_attr(cur, b.head, rem)
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service_load_blob(cur);
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}
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globfree(&gl);
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}
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static void
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service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
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{
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struct blob_attr *cur;
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int rem;
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get_hostname();
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vlist_update(&services);
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service_load("/tmp/run/mdns/*");
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blob_for_each_attr(cur, msg, rem) {
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struct blob_attr *cur2;
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int rem2;
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blobmsg_for_each_attr(cur2, cur, rem2) {
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struct blob_attr *cur3;
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int rem3;
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if (strcmp(blobmsg_name(cur2), "instances"))
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continue;
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blobmsg_for_each_attr(cur3, cur2, rem3) {
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struct blob_attr *cur4;
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int rem4;
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int running = 0;
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blobmsg_for_each_attr(cur4, cur3, rem4) {
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const char *name = blobmsg_name(cur4);
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if (!strcmp(name, "running")) {
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running = blobmsg_get_bool(cur4);
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} else if (running && !strcmp(name, "data")) {
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struct blob_attr *cur5;
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int rem5;
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blobmsg_for_each_attr(cur5, cur4, rem5) {
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struct blob_attr *cur6;
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int rem6;
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if (strcmp(blobmsg_name(cur5), "mdns"))
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continue;
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blobmsg_for_each_attr(cur6, cur5, rem6)
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service_load_blob(cur6);
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}
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break;
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}
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}
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}
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}
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}
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vlist_flush(&services);
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}
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void
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service_init(int announce)
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{
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get_hostname();
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service_init_announce = announce;
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ubus_service_list(service_init_cb);
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}
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void
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service_cleanup(void)
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{
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vlist_flush(&services);
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blob_buf_free(&b);
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}
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