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/// @file
#include "vere.h"
#include "mdns.h"
#include "dns_sd.h"
typedef struct _mdns_payload {
mdns_cb* cb;
DNSServiceRef sref;
char who[58];
bool fake;
uint16_t port;
uv_poll_t poll;
void* context;
} mdns_payload;
static void close_cb(uv_handle_t* poll) {
mdns_payload* payload = (mdns_payload*)poll->data;
DNSServiceRefDeallocate(payload->sref);
c3_free(payload);
}
static void getaddrinfo_cb(uv_getaddrinfo_t* req, int status, struct addrinfo* res) {
mdns_payload* payload = (mdns_payload*)req->data;
if (status < 0) {
u3l_log("mdns: getaddrinfo error: %s", uv_strerror(status));
} else {
struct sockaddr_in* addr = (struct sockaddr_in*)res->ai_addr;
payload->cb(payload->who, payload->fake, addr->sin_addr.s_addr, payload->port, payload->context);
}
payload->poll.data = payload;
uv_close((uv_handle_t*)&payload->poll, close_cb);
c3_free(req);
uv_freeaddrinfo(res);
}
static void resolve_cb(DNSServiceRef sref,
DNSServiceFlags f,
uint32_t interface,
DNSServiceErrorType err,
const char *name,
const char *host,
uint16_t port,
uint16_t tl,
const unsigned char *t,
void *context)
{
mdns_payload* payload = (mdns_payload*)context;
uv_poll_stop(&payload->poll);
if (err != kDNSServiceErr_NoError) {
u3l_log("mdns: dns resolve error %d", err);
payload->poll.data = payload;
uv_close((uv_handle_t*)&payload->poll, close_cb);
return;
}
payload->sref = sref;
payload->port = port;
const char *start = name;
if (strncmp(name, "fake-", 4) == 0) {
payload->fake = 1;
start = name + 5;
} else {
payload->fake = 0;
}
payload->who[0] = '~';
for (int i = 0; start[i] != '\0' && start[i] != '.' && i < 58; ++i)
{
payload->who[i+1] = start[i];
}
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET; // Request only IPv4 addresses
hints.ai_socktype = SOCK_STREAM; // TCP socket
uv_getaddrinfo_t* req = (uv_getaddrinfo_t*)c3_calloc(sizeof(uv_getaddrinfo_t));
req->data = (void*)payload;
uv_loop_t* loop = uv_default_loop();
int error = uv_getaddrinfo(loop, req, getaddrinfo_cb, host, NULL, &hints);
if (error < 0) {
u3l_log("mdns: getaddrinfo error: %s\n", uv_strerror(error));
payload->poll.data = payload;
uv_close((uv_handle_t*)&payload->poll, close_cb);
c3_free(req);
}
}
static void poll_cb(uv_poll_t* handle, int status, int events) {
DNSServiceRef sref = (DNSServiceRef) handle->data;
int err = DNSServiceProcessResult(sref);
}
static void init_sref_poll(DNSServiceRef sref, mdns_payload* payload) {
int fd = DNSServiceRefSockFD(sref);
uv_loop_t* loop = uv_default_loop();
payload->poll.data = (void*)sref;
uv_poll_init(loop, &payload->poll, fd);
uv_poll_start(&payload->poll, UV_READABLE, poll_cb);
}
static void browse_cb(DNSServiceRef s,
DNSServiceFlags f,
uint32_t interface,
DNSServiceErrorType err,
const char* name,
const char* type,
const char* domain,
void* context)
{
if (err != kDNSServiceErr_NoError) {
u3l_log("mdns: service browse error %i", err);
return;
}
if (f & kDNSServiceFlagsAdd) { // Add
// we are leaking payload because we don't know when we are done
// browsing, luckily we only browse once
mdns_payload* payload = (mdns_payload*)context;
mdns_payload* payload_copy = c3_calloc(sizeof *payload_copy);
// copy to prevent asynchronous thrashing of payload
memcpy(payload_copy, payload, sizeof(mdns_payload));
DNSServiceErrorType err =
DNSServiceResolve(&payload_copy->sref, 0, interface,
name, type, domain, resolve_cb,
(void*)payload_copy);
init_sref_poll(payload_copy->sref, payload_copy);
if (err != kDNSServiceErr_NoError) {
u3l_log("mdns: dns service resolve error %i", err);
payload_copy->poll.data = payload_copy;
uv_close((uv_handle_t*)&payload_copy->poll, close_cb);
}
}
}
static void register_close_cb(uv_handle_t* poll) {
// not freeing sref with DNSServiceRefDeallocate since that
// deregisters us from mdns
mdns_payload* payload = (mdns_payload*)poll->data;
c3_free(payload);
}
static void register_cb(DNSServiceRef sref,
DNSServiceFlags f,
DNSServiceErrorType err,
const char* name,
const char* type,
const char* domain,
void* context)
{
mdns_payload* payload = (mdns_payload*)context;
if (err != kDNSServiceErr_NoError) {
u3l_log("mdns: service register error %i", err);
} else {
u3l_log("mdns: %s registered on all interfaces", name);
}
uv_poll_stop(&payload->poll);
uv_close((uv_handle_t*)&payload->poll, register_close_cb);
}
void mdns_init(uint16_t port, bool fake, char* our, mdns_cb* cb, void* context)
{
#if defined(U3_OS_linux)
setenv("AVAHI_COMPAT_NOWARN", "1", 0);
setenv("DBUS_SYSTEM_BUS_ADDRESS", "unix:path=/var/run/dbus/system_bus_socket", 0);
# endif
mdns_payload* register_payload = (mdns_payload*)c3_calloc(sizeof(mdns_payload));
DNSServiceRef sref;
DNSServiceErrorType err;
char* domain;
char s[63] = {0};
if (fake) {
strcat(s, "fake-");
strcat(s, our + 1); // certain url parsers don't like the ~
domain = s;
} else {
domain = our + 1;
}
err = DNSServiceRegister(&sref, 0, 0, domain, "_ames._udp",
NULL, NULL, htons(port), 0, NULL, register_cb, (void*)register_payload);
if (err != kDNSServiceErr_NoError) {
if (err == kDNSServiceErr_Unknown) {
#if defined(U3_OS_linux)
u3l_log("mdns: init failed, install avahi on this system for mdns support");
#else
u3l_log("mdns: service register error %i", err);
# endif
} else {
u3l_log("mdns: service register error %i", err);
}
DNSServiceRefDeallocate(sref);
return;
}
init_sref_poll(sref, register_payload);
mdns_payload* browse_payload = (mdns_payload*)c3_calloc(sizeof(mdns_payload));
browse_payload->cb = cb;
browse_payload->context = context;
DNSServiceErrorType dnserr;
DNSServiceRef sref2;
dnserr = DNSServiceBrowse(&sref2, 0, 0, "_ames._udp", NULL, browse_cb, (void *)browse_payload);
if (dnserr != kDNSServiceErr_NoError) {
u3l_log("mdns: service browse error %i", dnserr);
DNSServiceRefDeallocate(sref2);
return;
}
init_sref_poll(sref2, browse_payload);
}
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