Update contrib/libs/c-ares to 1.34.2

commit_hash:abd65f143c484666e1545e6bbfb9d947df95ecd6

1 files changed, 137 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/src/lib/ares_close_sockets.c b/contrib/libs/c-ares/src/lib/ares_close_sockets.c
new file mode 100644
index 0000000000..fd3bf3c4b1
--- /dev/null
+++ b/contrib/libs/c-ares/src/lib/ares_close_sockets.c
@@ -0,0 +1,137 @@
+/* MIT License
+ *
+ * Copyright (c) 1998 Massachusetts Institute of Technology
+ * Copyright (c) The c-ares project and its contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ares_private.h"
+#include <assert.h>
+
+static void ares_requeue_queries(ares_conn_t  *conn,
+                                 ares_status_t requeue_status)
+{
+  ares_query_t  *query;
+  ares_timeval_t now;
+
+  ares_tvnow(&now);
+
+  while ((query = ares_llist_first_val(conn->queries_to_conn)) != NULL) {
+    ares_requeue_query(query, &now, requeue_status, ARES_TRUE, NULL);
+  }
+}
+
+void ares_close_connection(ares_conn_t *conn, ares_status_t requeue_status)
+{
+  ares_server_t  *server  = conn->server;
+  ares_channel_t *channel = server->channel;
+
+  /* Unlink */
+  ares_llist_node_claim(
+    ares_htable_asvp_get_direct(channel->connnode_by_socket, conn->fd));
+  ares_htable_asvp_remove(channel->connnode_by_socket, conn->fd);
+
+  if (conn->flags & ARES_CONN_FLAG_TCP) {
+    server->tcp_conn = NULL;
+  }
+
+  ares_buf_destroy(conn->in_buf);
+  ares_buf_destroy(conn->out_buf);
+
+  /* Requeue queries to other connections */
+  ares_requeue_queries(conn, requeue_status);
+
+  ares_llist_destroy(conn->queries_to_conn);
+
+  ares_conn_sock_state_cb_update(conn, ARES_CONN_STATE_NONE);
+
+  ares_socket_close(channel, conn->fd);
+
+  ares_free(conn);
+}
+
+void ares_close_sockets(ares_server_t *server)
+{
+  ares_llist_node_t *node;
+
+  while ((node = ares_llist_node_first(server->connections)) != NULL) {
+    ares_conn_t *conn = ares_llist_node_val(node);
+    ares_close_connection(conn, ARES_SUCCESS);
+  }
+}
+
+void ares_check_cleanup_conns(const ares_channel_t *channel)
+{
+  ares_slist_node_t *snode;
+
+  if (channel == NULL) {
+    return; /* LCOV_EXCL_LINE: DefensiveCoding */
+  }
+
+  /* Iterate across each server */
+  for (snode = ares_slist_node_first(channel->servers); snode != NULL;
+       snode = ares_slist_node_next(snode)) {
+    ares_server_t     *server = ares_slist_node_val(snode);
+    ares_llist_node_t *cnode;
+
+    /* Iterate across each connection */
+    cnode = ares_llist_node_first(server->connections);
+    while (cnode != NULL) {
+      ares_llist_node_t *next       = ares_llist_node_next(cnode);
+      ares_conn_t       *conn       = ares_llist_node_val(cnode);
+      ares_bool_t        do_cleanup = ARES_FALSE;
+      cnode                         = next;
+
+      /* Has connections, not eligible */
+      if (ares_llist_len(conn->queries_to_conn)) {
+        continue;
+      }
+
+      /* If we are configured not to stay open, close it out */
+      if (!(channel->flags & ARES_FLAG_STAYOPEN)) {
+        do_cleanup = ARES_TRUE;
+      }
+
+      /* If the associated server has failures, close it out. Resetting the
+       * connection (and specifically the source port number) can help resolve
+       * situations where packets are being dropped.
+       */
+      if (conn->server->consec_failures > 0) {
+        do_cleanup = ARES_TRUE;
+      }
+
+      /* If the udp connection hit its max queries, always close it */
+      if (!(conn->flags & ARES_CONN_FLAG_TCP) && channel->udp_max_queries > 0 &&
+          conn->total_queries >= channel->udp_max_queries) {
+        do_cleanup = ARES_TRUE;
+      }
+
+      if (!do_cleanup) {
+        continue;
+      }
+
+      /* Clean it up */
+      ares_close_connection(conn, ARES_SUCCESS);
+    }
+  }
+}