Move listen code to listen.c

1 files changed, 105 insertions, 0 deletions

diff --git a/listen.c b/listen.c
new file mode 100644
index 0000000..4ecf5d3
--- /dev/null
+++ b/listen.c
@@ -0,0 +1,105 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sysexits.h>
+#include <tls.h>
+#include <unistd.h>
+
+#include "bouncer.h"
+
+static struct tls *server;
+
+void listenConfig(const char *cert, const char *priv) {
+	struct tls_config *config = tls_config_new();
+	if (!config) errx(EX_SOFTWARE, "tls_config_new");
+
+	int error = tls_config_set_keypair_file(config, cert, priv);
+	if (error) {
+		errx(
+			EX_CONFIG, "tls_config_set_keypair_file: %s",
+			tls_config_error(config)
+		);
+	}
+
+	server = tls_server();
+	if (!server) errx(EX_SOFTWARE, "tls_server");
+
+	error = tls_configure(server, config);
+	if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(server));
+	tls_config_free(config);
+}
+
+size_t
+listenBind(
+	struct pollfd fds[], size_t cap,
+	const char *host, const char *port
+) {
+	struct addrinfo *head;
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_STREAM,
+		.ai_protocol = IPPROTO_TCP,
+	};
+	int error = getaddrinfo(host, port, &hints, &head);
+	if (error) errx(EX_NOHOST, "%s:%s: %s", host, port, gai_strerror(error));
+
+	size_t len = 0;
+	for (struct addrinfo *ai = head; ai && len < cap; ai = ai->ai_next) {
+		int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+		if (sock < 0) err(EX_OSERR, "socket");
+
+		error = bind(sock, ai->ai_addr, ai->ai_addrlen);
+		if (error) {
+			warn("%s:%s", host, port);
+			close(sock);
+			continue;
+		}
+
+		error = listen(sock, 1);
+		if (error) err(EX_IOERR, "listen");
+
+		fds[len].fd = sock;
+		fds[len].events = POLLIN;
+		len++;
+	}
+	freeaddrinfo(head);
+
+	if (!len) errx(EX_UNAVAILABLE, "could not bind any sockets");
+	return len;
+}
+
+struct tls *listenAccept(struct pollfd *poll, int fd) {
+	int sock = accept(fd, NULL, NULL);
+	if (sock < 0) err(EX_IOERR, "accept");
+
+	int yes = 1;
+	int error = setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, &yes, sizeof(yes));
+	if (error) err(EX_OSERR, "setsockopt");
+
+	struct tls *client;
+	error = tls_accept_socket(server, &client, sock);
+	if (error) errx(EX_SOFTWARE, "tls_accept_socket: %s", tls_error(server));
+
+	poll->fd = sock;
+	poll->events = POLLIN;
+	return client;
+}