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diff --git a/src/resolve.c b/src/resolve.c
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+++ b/src/resolve.c
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+/*
+ Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#define _GNU_SOURCE
+
+#include "fastd.h"
+#include "peer.h"
+
+#include <netdb.h>
+#include <pthread.h>
+#include <signal.h>
+
+
+typedef struct _resolv_arg {
+ fastd_context *ctx;
+ pthread_t master_thread;
+ char *hostname;
+ sa_family_t af;
+ uint16_t port;
+} resolv_arg;
+
+
+static void* fastd_resolve_peer_handshake_do(void *varg) {
+ resolv_arg *arg = varg;
+
+ struct addrinfo hints;
+ struct addrinfo *res = NULL;
+ int gai_ret;
+ bool error = false;
+
+ char portstr[6];
+ snprintf(portstr, 6, "%u", arg->port);
+
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = arg->af;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = IPPROTO_UDP;
+ hints.ai_flags = AI_NUMERICSERV | AI_ADDRCONFIG;
+#ifdef AI_IDN
+ hints.ai_flags |= AI_IDN;
+#endif
+
+ gai_ret = getaddrinfo(arg->hostname, portstr, &hints, &res);
+
+ if (gai_ret) {
+ pr_debug(arg->ctx, "Resolving host `%s' failed: %s", arg->hostname, gai_strerror(gai_ret));
+ error = true;
+ }
+ else if (res->ai_addrlen > sizeof(fastd_peer_address)) {
+ pr_warn(arg->ctx, "Resolving host `%s': unsupported address returned", arg->hostname);
+ error = true;
+ }
+
+ fastd_resolve_return *ret = malloc(sizeof(fastd_resolve_return));
+
+ ret->ctx = arg->ctx;
+
+ ret->hostname = arg->hostname;
+ ret->af = arg->af;
+ ret->port = arg->port;
+
+ if (!error) {
+ pr_debug(arg->ctx, "Resolved host `%s' successfully", arg->hostname);
+ memcpy(&ret->addr, res->ai_addr, res->ai_addrlen);
+ }
+ else {
+ ret->addr.sa.sa_family = AF_UNSPEC;
+ }
+
+ union sigval sigval;
+ sigval.sival_ptr = ret;
+ if (pthread_sigqueue(arg->master_thread, SIGUSR1, sigval))
+ exit_errno(arg->ctx, "pthread_sigqueue");
+
+ freeaddrinfo(res);
+ free(arg);
+
+ return NULL;
+}
+
+void fastd_resolve_peer_handshake(fastd_context *ctx, fastd_peer *peer) {
+ pr_debug(ctx, "Resolving host `%s' for peer %P...", peer->config->hostname, peer);
+
+ resolv_arg *arg = malloc(sizeof(resolv_arg));
+
+ arg->ctx = ctx;
+ arg->master_thread = pthread_self();
+ arg->hostname = strdup(peer->config->hostname);
+ arg->af = peer->config->address.sa.sa_family;
+ arg->port = ntohs(peer->config->address.in.sin_port);
+
+ pthread_t thread;
+ if (pthread_create(&thread, NULL, fastd_resolve_peer_handshake_do, arg) != 0) {
+ pr_error_errno(ctx, "unable to create resolver thread");
+ free(arg->hostname);
+ free(arg);
+ }
+
+ pthread_detach(thread);
+}