server ipv6 support

src/server.c

@@ -22,24 +22,30 @@ struct rx_info {
   uint8_t tv_set : 1;
 };
 
+static int setsockopt_int(int fd, int level, int option, int val) {
+  return setsockopt(fd, level, option, &val, sizeof(val));
+}
+
 static int server_init(const struct server_conf *conf, struct server_ctx *ctx) {
-  struct sockaddr_in server_addr = { 0 };
+  struct sockaddr_in6 server_addr = { 0 };
   int sock_fd;
-  int sockopt_int_yes = 1;
 
-  server_addr.sin_family = AF_INET;
-  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-  server_addr.sin_port = htons(conf->port);
+  server_addr.sin6_family = AF_INET6;
+  server_addr.sin6_addr = in6addr_any;
+  server_addr.sin6_port = htons(conf->port);
 
-  if ((sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+  if ((sock_fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) < 0)
     FAIL("failed to create socket: %s", strerror(errno));
 
-  if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &sockopt_int_yes, sizeof(sockopt_int_yes)))
+  if (setsockopt_int(sock_fd, SOL_SOCKET, SO_REUSEADDR, 1))
     FAIL("failed to set SO_REUSEADDR: %s", strerror(errno));
 
-  if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMP, &sockopt_int_yes, sizeof(sockopt_int_yes)))
+  if (setsockopt_int(sock_fd, SOL_SOCKET, SO_TIMESTAMP, 1))
     FAIL("failed to set SO_TIMESTAMP: %s", strerror(errno));
 
+  if (setsockopt_int(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, 0))
+    FAIL("failed to set IPV6_V6ONLY: %s", strerror(errno));
+
   if (bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)))
     FAIL("failed to bind: %s", strerror(errno));