2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/types.h>
15 #include <arpa/nameser.h>
16 #include <sys/socket.h>
27 #include <libubox/vlist.h>
28 #include <libubox/uloop.h>
29 #include <libubox/avl-cmp.h>
30 #include <libubox/blobmsg_json.h>
35 #include "interface.h"
44 struct vlist_node node;
56 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
57 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
58 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
62 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
63 struct vlist_node *node_old);
65 static struct blob_buf b;
66 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
67 static char *sdudp = "_services._dns-sd._udp.local";
68 static char *sdtcp = "_services._dns-sd._tcp.local";
71 service_name(const char *domain)
73 static char buffer[256];
75 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
81 service_add_ptr(const char *host)
83 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
88 dns_add_answer(TYPE_PTR, mdns_buf, len);
92 service_add_srv(struct service *s)
94 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
95 int len = sizeof(*sd);
97 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
98 if (len <= sizeof(*sd))
101 sd->port = cpu_to_be16(s->port);
102 dns_add_answer(TYPE_SRV, mdns_buf, len);
105 #define TOUT_LOOKUP 60
108 service_timeout(struct service *s)
110 time_t t = time(NULL);
112 if (t - s->t <= TOUT_LOOKUP)
121 service_reply_a(struct interface *iface, int type)
123 struct ifaddrs *ifap, *ifa;
124 struct sockaddr_in *sa;
125 struct sockaddr_in6 *sa6;
131 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
132 if (strcmp(ifa->ifa_name, iface->name))
134 if (ifa->ifa_addr->sa_family==AF_INET) {
135 sa = (struct sockaddr_in *) ifa->ifa_addr;
136 addr = inet_ntoa(sa->sin_addr);
137 printf("Interface: %s\tAddress4: %s\n", ifa->ifa_name, addr);
138 dns_add_answer(TYPE_A, (uint8_t *) &sa->sin_addr, 4);
140 if (ifa->ifa_addr->sa_family==AF_INET6) {
141 uint8_t ll_prefix[] = {0xfe, 0x80 };
142 char buf[64] = { 0 };
143 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
144 if (!memcmp(&sa6->sin6_addr, &ll_prefix, 2)) {
145 if (inet_ntop(AF_INET6, &sa6->sin6_addr, buf, 64))
146 printf("Interface: %s\tAddress6: %s\n", ifa->ifa_name, buf);
147 dns_add_answer(TYPE_AAAA, (uint8_t *) &sa6->sin6_addr, 16);
151 dns_send_answer(iface, mdns_hostname_local);
157 service_reply(struct interface *iface, const char *match)
161 vlist_for_each_element(&services, s, node) {
162 const char *host = service_name(s->service);
163 char *service = strstr(host, "._");
165 if (!s->active || !service || !service_timeout(s))
170 if (match && strcmp(match, s->service))
174 service_add_ptr(service_name(s->service));
175 dns_send_answer(iface, service);
179 if (s->txt && s->txt_len)
180 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
181 dns_send_answer(iface, host);
187 service_reply_a(iface, TYPE_A);
191 service_announce_services(struct interface *iface, const char *service)
196 if (!strcmp(service, sdudp))
198 else if (strcmp(service, sdtcp))
201 vlist_for_each_element(&services, s, node) {
202 if (!strstr(s->service, "._tcp") && tcp)
204 if (!strstr(s->service, "._udp") && !tcp)
208 service_add_ptr(s->service);
210 dns_send_answer(iface, sdtcp);
212 dns_send_answer(iface, sdudp);
213 service_reply(iface, s->service);
218 service_announce(struct interface *iface)
220 service_announce_services(iface, sdudp);
221 service_announce_services(iface, sdtcp);
225 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
226 struct vlist_node *node_old)
233 s = container_of(node_old, struct service, node);
238 service_load(char *path)
240 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
244 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
247 for (i = 0; i < gl.gl_pathc; i++) {
248 blob_buf_init(&b, 0);
250 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
252 blob_for_each_attr(cur, b.head, rem) {
254 char *d_service, *d_daemon;
259 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
260 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
261 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
264 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
265 txt_len += 1 + strlen(blobmsg_get_string(txt));
267 s = calloc_a(sizeof(*s),
268 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
269 &d_service, strlen(blobmsg_name(cur)) + 1,
274 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
275 s->service = strcpy(d_service, blobmsg_name(cur));
276 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
279 s->txt_len = txt_len;
282 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
283 int len = strlen(blobmsg_get_string(txt));
290 memcpy(d_txt, blobmsg_get_string(txt), len);
294 vlist_add(&services, &s->node, s->service);
304 vlist_update(&services);
305 service_load("/tmp/run/mdnsd/*");
306 vlist_flush(&services);
310 service_cleanup(void)
312 vlist_flush(&services);