network: Add `create_socket()`

This function makes makes it easier to create sockets, without having to
duplicate code.

2 files changed, 56 insertions, 0 deletions

diff --git a/network.c b/network.c
index f7b5ecb..9b9557e 100644
--- a/network.c
+++ b/network.c
@@ -18,3 +18,58 @@ const char *addr_to_str(struct sockaddr *sa, socklen_t len) {
 	}
 	return str;
 }
+
+int create_socket(struct sockaddr *sa, size_t sock_len) {
+	const int one = 1;
+	/* Create a new listen socket. */
+	const int fd = socket(sa->sa_family, SOCK_SEQPACKET, IPPROTO_SCTP);
+	int ret = fd;
+
+	/* Did we fail to create the listen socket? */
+	if (fd < 0) {
+		log_reason(LOG_ERR, "Failed to create listen socket.", strerror(errno));
+		return -1;
+	}
+
+	/* Do we have an IPv6 socket? */
+	if (sa->sa_family == AF_INET6) {
+		int set = 1;
+		setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &set, sizeof(set));
+	}
+
+	/* Did we fail to enable SO_REUSEADDR? */
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) {
+		log_reason(LOG_ERR, "Failed to enable SO_REUSEADDR.", strerror(errno));
+		ret = -1;
+	}
+
+
+	/* Did we fail to bind the listen socket? */
+	if (ret >= 0 && bind(fd, sa, sock_len) < 0) {
+		log_reason(LOG_ERR, "Failed to bind listen socket.", strerror(errno));
+		ret = -1;
+	}
+
+	/* Did we fail to listen to the socket? */
+	if (ret >= 0 && listen(fd, 20) < 0) {
+		log_reason(LOG_ERR, "Failed to listen to socket.", strerror(errno));
+		ret = -1;
+	}
+
+	/* Did we get an error? */
+	if (ret < 0) {
+		/* Close the socket. */
+		close(fd);
+		/* Is this a unix domain socket? */
+		if (sa->sa_family == AF_UNIX) {
+			struct sockaddr_un *sa_un = (struct sockaddr_un *)sa;
+			/* Unlink the path. */
+			unlink(sa_un->sun_path);
+		}
+		log(LOG_ERR, "Failed to create socket for address \"%s\".", addr_to_str(sa, sock_len));
+	} else {
+		log(LOG_INFO, "Successfully created socket descriptor %i for address \"%s\".", fd, addr_to_str(sa, sock_len));
+	}
+
+	return ret;
+}
diff --git a/network.h b/network.h
index 671df30..b953a1d 100644
--- a/network.h
+++ b/network.h
@@ -32,5 +32,6 @@ struct packet {
 };
 
 extern const char *addr_to_str(struct sockaddr *sa, socklen_t len);
+extern int create_socket(struct sockaddr *sa, size_t sock_len);
 
 #endif