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connectd: resolve ADDR_TYPE_DNS

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This will resolve ADDR_TYPE_DNS wireaddr by expanding connect->addrs with one
new wireaddr ADDR_INTERNAL_WIREADDR per DNS result and calling recursion
This commit is contained in:
Michael Schmoock 2021-10-07 13:01:05 +02:00 • committed by Rusty Russell
parent 01e8a523e9
commit cb20d6747e
1 changed files with 50 additions and 2 deletions
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52
connectd/connectd.c
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@ -874,6 +874,8 @@ static struct io_plan *conn_init(struct io_conn *conn,
"Can't connect to forproxy address");
break;
case ADDR_INTERNAL_WIREADDR:
/* DNS should have been resolved before */
assert(addr->u.wireaddr.type != ADDR_TYPE_DNS);
/* If it was a Tor address, we wouldn't be here. */
assert(!is_toraddr((char*)addr->u.wireaddr.addr));
ai = wireaddr_to_addrinfo(tmpctx, &addr->u.wireaddr);
@ -926,6 +928,12 @@ static void try_connect_one_addr(struct connecting *connect)
bool use_proxy = connect->daemon->always_use_proxy;
const struct wireaddr_internal *addr = &connect->addrs[connect->addrnum];
struct io_conn *conn;
bool use_dns = connect->daemon->use_dns;
struct addrinfo hints, *ais, *aii;
struct wireaddr_internal addrhint;
int gai_err;
struct sockaddr_in *sa4;
struct sockaddr_in6 *sa6;
/* In case we fail without a connection, make destroy_io_conn happy */
connect->conn = NULL;
@ -976,8 +984,48 @@ static void try_connect_one_addr(struct connecting *connect)
af = AF_INET6;
break;
case ADDR_TYPE_DNS:
// TODO: resolve with getaddrinfo and set af
break;
if (use_proxy) /* hand it to the proxy */
break;
if (!use_dns) /* ignore DNS when we can't use it */
goto next;
/* Resolve with getaddrinfo */
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = AF_UNSPEC;
hints.ai_protocol = 0;
hints.ai_flags = AI_ADDRCONFIG;
gai_err = getaddrinfo((char *)addr->u.wireaddr.addr,
tal_fmt(tmpctx, "%d",
addr->u.wireaddr.port),
&hints, &ais);
if (gai_err != 0) {
status_debug("DNS with getaddrinfo gave: %s",
gai_strerror(gai_err));
goto next;
}
/* create new addrhints on-the-fly per result ... */
for (aii = ais; aii; aii = aii->ai_next) {
addrhint.itype = ADDR_INTERNAL_WIREADDR;
if (aii->ai_family == AF_INET) {
sa4 = (struct sockaddr_in *) aii->ai_addr;
wireaddr_from_ipv4(&addrhint.u.wireaddr,
&sa4->sin_addr,
addr->u.wireaddr.port);
} else if (aii->ai_family == AF_INET6) {
sa6 = (struct sockaddr_in6 *) aii->ai_addr;
wireaddr_from_ipv6(&addrhint.u.wireaddr,
&sa6->sin6_addr,
addr->u.wireaddr.port);
} else {
/* skip unsupported ai_family */
continue;
}
tal_arr_expand(&connect->addrs, addrhint);
/* don't forget to update convenience pointer */
addr = &connect->addrs[connect->addrnum];
}
freeaddrinfo(ais);
goto next;
case ADDR_TYPE_WEBSOCKET:
af = -1;
break;