#include <arpa/nameser.h>
#include <sys/socket.h>
-#include <ifaddrs.h>
#include <resolv.h>
#include <glob.h>
+#include <inttypes.h>
#include <stdio.h>
#include <time.h>
-#include <uci.h>
-#include <uci_blob.h>
-
#include <libubus.h>
#include <libubox/vlist.h>
#include <libubox/uloop.h>
#include "announce.h"
enum {
+ SERVICE_INSTANCE,
SERVICE_SERVICE,
SERVICE_PORT,
SERVICE_TXT,
+ SERVICE_HOSTNAME,
__SERVICE_MAX,
};
time_t t;
const char *id;
+ const char *instance;
const char *service;
const uint8_t *txt;
int txt_len;
};
static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
+ [SERVICE_INSTANCE] = { .name = "instance", .type = BLOBMSG_TYPE_STRING },
[SERVICE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
[SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
[SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
+ [SERVICE_HOSTNAME] = { .name = "hostname", .type = BLOBMSG_TYPE_STRING },
};
static void
service_update(struct vlist_tree *tree, struct vlist_node *node_new,
struct vlist_node *node_old);
+static void
+hostname_update(struct vlist_tree *tree, struct vlist_node *node_new,
+ struct vlist_node *node_old);
+
static struct blob_buf b;
static VLIST_TREE(services, avl_strcmp, service_update, false, false);
-static char *sdudp = "_services._dns-sd._udp.local";
-static char *sdtcp = "_services._dns-sd._tcp.local";
+VLIST_TREE(hostnames, avl_strcmp, hostname_update, false, false);
static int service_init_announce;
+/**
+ * service_instance_name - construct Service Instance Name as in RFC 6763
+ *
+ * RFC 6763 specifies Service Instance Names in the following way:
+ *
+ * Service Instance Name = <Instance> . <Service> . <Domain>
+ *
+ * @s: service to generate service instance name for
+ */
static const char *
-service_name(const char *domain)
+service_instance_name(struct service *s)
{
static char buffer[256];
- snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
+ snprintf(buffer, sizeof(buffer), "%s.%s", s->instance, s->service);
return buffer;
}
#define TOUT_LOOKUP 60
-static int
+static time_t
service_timeout(struct service *s)
{
- time_t t = time(NULL);
+ time_t t = monotonic_time();
- if (t - s->t <= TOUT_LOOKUP)
+ if (t - s->t <= TOUT_LOOKUP) {
+ DBG(2, "t=%" PRId64 ", s->t=%" PRId64 ", t - s->t = %" PRId64 "\n", (int64_t)t, (int64_t)s->t, (int64_t)(t - s->t));
return 0;
-
- s->t = t;
-
- return 1;
-}
-
-void
-service_reply_a(struct interface *iface, int type, int ttl)
-{
- struct ifaddrs *ifap, *ifa;
- struct sockaddr_in *sa;
- struct sockaddr_in6 *sa6;
-
- getifaddrs(&ifap);
-
- dns_init_answer();
- for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
- if (strcmp(ifa->ifa_name, iface->name))
- continue;
- if (ifa->ifa_addr->sa_family==AF_INET) {
- sa = (struct sockaddr_in *) ifa->ifa_addr;
- dns_add_answer(TYPE_A, (uint8_t *) &sa->sin_addr, 4, ttl);
- }
- if (ifa->ifa_addr->sa_family==AF_INET6) {
- uint8_t ll_prefix[] = {0xfe, 0x80 };
- sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
- if (!memcmp(&sa6->sin6_addr, &ll_prefix, 2))
- dns_add_answer(TYPE_AAAA, (uint8_t *) &sa6->sin6_addr, 16, ttl);
- }
}
- dns_send_answer(iface, mdns_hostname_local);
- freeifaddrs(ifap);
+ return t;
}
static void
-service_reply_single(struct interface *iface, struct service *s, const char *match, int ttl, int force)
+service_reply_single(struct interface *iface, struct sockaddr *to, struct service *s, int ttl, int force)
{
- const char *host = service_name(s->service);
+ const char *host = service_instance_name(s);
char *service = strstr(host, "._");
+ time_t t = service_timeout(s);
- if (!force && (!s->active || !service || !service_timeout(s)))
+
+ if (!force && (!s->active || !service || !t))
return;
service++;
- if (match && strcmp(match, s->service))
- return;
+ s->t = t;
dns_init_answer();
- service_add_ptr(service_name(s->service), ttl);
- dns_send_answer(iface, service);
+ service_add_ptr(service_instance_name(s), ttl);
+ dns_send_answer(iface, to, service);
dns_init_answer();
service_add_srv(s, ttl);
if (s->txt && s->txt_len)
dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
- dns_send_answer(iface, host);
+ dns_send_answer(iface, to, host);
}
void
-service_reply(struct interface *iface, const char *match, int ttl)
+service_reply(struct interface *iface, struct sockaddr *to, const char *instance, const char *service_domain, int ttl)
{
struct service *s;
- vlist_for_each_element(&services, s, node)
- service_reply_single(iface, s, match, ttl, 0);
-
- if (match)
- return;
-
- service_reply_a(iface, TYPE_A, ttl);
+ vlist_for_each_element(&services, s, node) {
+ if (instance && strcmp(s->instance, instance))
+ continue;
+ if (service_domain && strcmp(s->service, service_domain))
+ continue;
+ service_reply_single(iface, to, s, ttl, 0);
+ }
}
void
-service_announce_services(struct interface *iface, const char *service)
+service_announce_services(struct interface *iface, struct sockaddr *to, int ttl)
{
struct service *s;
- int tcp = 1;
-
- if (!strcmp(service, sdudp))
- tcp = 0;
- else if (strcmp(service, sdtcp))
- return;
vlist_for_each_element(&services, s, node) {
- if (!strstr(s->service, "._tcp") && tcp)
- continue;
- if (!strstr(s->service, "._udp") && !tcp)
- continue;
s->t = 0;
- dns_init_answer();
- service_add_ptr(s->service, announce_ttl);
- if (tcp)
- dns_send_answer(iface, sdtcp);
- else
- dns_send_answer(iface, sdudp);
- service_reply(iface, s->service, announce_ttl);
+ if (ttl) {
+ dns_init_answer();
+ service_add_ptr(s->service, ttl);
+ dns_send_answer(iface, to, C_DNS_SD);
+ }
+ service_reply_single(iface, to, s, ttl, 0);
}
}
-void
-service_announce(struct interface *iface)
-{
- service_announce_services(iface, sdudp);
- service_announce_services(iface, sdtcp);
-}
-
static void
service_update(struct vlist_tree *tree, struct vlist_node *node_new,
struct vlist_node *node_old)
if (service_init_announce)
vlist_for_each_element(&interfaces, iface, node) {
s->t = 0;
- service_reply_single(iface, s, NULL, announce_ttl, 1);
+ service_reply_single(iface, NULL, s, announce_ttl, 1);
}
return;
}
s = container_of(node_old, struct service, node);
if (!node_new && service_init_announce)
vlist_for_each_element(&interfaces, iface, node)
- service_reply_single(iface, s, NULL, 0, 1);
+ service_reply_single(iface, NULL, s, 0, 1);
free(s);
}
+static void
+hostname_update(struct vlist_tree *tree, struct vlist_node *node_new,
+ struct vlist_node *node_old)
+{
+ struct interface *iface;
+ struct hostname *h;
+
+ if (!node_old) {
+ h = container_of(node_new, struct hostname, node);
+ vlist_for_each_element(&interfaces, iface, node)
+ dns_reply_a(iface, NULL, announce_ttl, h->hostname);
+ return;
+ }
+
+ h = container_of(node_old, struct hostname, node);
+ if (!node_new)
+ vlist_for_each_element(&interfaces, iface, node)
+ dns_reply_a(iface, NULL, 0, h->hostname);
+
+ free(h);
+}
+
+static void
+service_load_hostname(struct blob_attr *b)
+{
+ struct hostname *h;
+ char *hostname, *d_hostname;
+
+ hostname = blobmsg_get_string(b);
+ h = calloc_a(sizeof(*h), &d_hostname, strlen(hostname) + 1);
+ if (!h)
+ return;
+
+ h->hostname = strcpy(d_hostname, hostname);
+
+ vlist_add(&hostnames, &h->node, h->hostname);
+}
+
static void
service_load_blob(struct blob_attr *b)
{
struct blob_attr *txt, *_tb[__SERVICE_MAX];
struct service *s;
- char *d_service, *d_id;
+ char *d_instance, *d_service, *d_id;
uint8_t *d_txt;
int rem2;
int txt_len = 0;
+ unsigned int n;
blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
_tb, blobmsg_data(b), blobmsg_data_len(b));
+
+ if (_tb[SERVICE_HOSTNAME]) {
+ service_load_hostname(_tb[SERVICE_HOSTNAME]);
+ return;
+ }
+
if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
return;
- if (_tb[SERVICE_SERVICE])
+ if (_tb[SERVICE_TXT])
blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
txt_len += 1 + strlen(blobmsg_get_string(txt));
+ n = strlen(blobmsg_name(b));
s = calloc_a(sizeof(*s),
- &d_id, strlen(blobmsg_name(b)) + 1,
+ &d_id, n + 1,
+ &d_instance, _tb[SERVICE_INSTANCE] ? strlen(blobmsg_get_string(_tb[SERVICE_INSTANCE])) + 1 : 0,
&d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
&d_txt, txt_len);
if (!s)
return;
s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
- s->id = strcpy(d_id, blobmsg_name(b));
+ s->id = strncpy(d_id, blobmsg_name(b), n);
+ if (_tb[SERVICE_INSTANCE])
+ s->instance = strcpy(d_instance, blobmsg_get_string(_tb[SERVICE_INSTANCE]));
+ else
+ s->instance = umdns_host_label;
s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
s->active = 1;
s->t = 0;
s->txt_len = txt_len;
s->txt = d_txt;
- if (_tb[SERVICE_SERVICE])
+ if (_tb[SERVICE_TXT])
blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
int len = strlen(blobmsg_get_string(txt));
if (!len)
for (i = 0; i < gl.gl_pathc; i++) {
blob_buf_init(&b, 0);
- if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
+ if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i])) {
blob_for_each_attr(cur, b.head, rem)
service_load_blob(cur);
+ } else {
+ fprintf(stderr, "Error reading %s JSON\n", gl.gl_pathv[i]);
+ }
}
globfree(&gl);
}
get_hostname();
vlist_update(&services);
- service_load("/tmp/run/mdns/*");
+ vlist_update(&hostnames);
+ service_load("/etc/umdns/*");
blob_for_each_attr(cur, msg, rem) {
struct blob_attr *cur2;
}
}
vlist_flush(&services);
+ vlist_flush(&hostnames);
}
void
service_init(int announce)
{
+ get_hostname();
+
service_init_announce = announce;
ubus_service_list(service_init_cb);
}
projects / project / mdnsd.git / blobdiff