Try using INT_MAX, not SOMAXCONN, to set listen() backlog.

Fall back to SOMAXCONN if INT_MAX doesn't work.

We'd like to do this because the actual maximum is overrideable by the
kernel, and the value in the header file might not be right at all.
All implementations I can find out about claim that this is supported.

Fix for 9716; bugfix on every Tor.

1 files changed, 22 insertions, 1 deletions

diff --git a/src/or/connection.c b/src/or/connection.c
index 6e754a0f7a..41946e4485 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -926,6 +926,27 @@ make_socket_reuseable(tor_socket_t sock)
 #endif
 }
 
+/** Max backlog to pass to listen.  We start at */
+static int listen_limit = INT_MAX;
+
+/* Listen on <b>fd</b> with appropriate backlog. Return as for listen. */
+static int
+tor_listen(tor_socket_t fd)
+{
+  int r;
+
+  if ((r = listen(fd, listen_limit)) < 0) {
+    if (listen_limit == SOMAXCONN)
+      return r;
+    if ((r = listen(fd, SOMAXCONN)) == 0) {
+      listen_limit = SOMAXCONN;
+      log_warn(LD_NET, "Setting listen backlog to INT_MAX connections "
+               "didn't work, but SOMAXCONN did. Lowering backlog limit.");
+    }
+  }
+  return r;
+}
+
 /** Bind a new non-blocking socket listening to the socket described
  * by <b>listensockaddr</b>.
  *
@@ -1009,7 +1030,7 @@ connection_listener_new(const struct sockaddr *listensockaddr,
     }
 
     if (is_tcp) {
-      if (listen(s,SOMAXCONN) < 0) {
+      if (tor_listen(s) < 0) {
         log_warn(LD_NET, "Could not listen on %s:%u: %s", address, usePort,
                  tor_socket_strerror(tor_socket_errno(s)));
         tor_close_socket(s);