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/* MIT License
*
* Copyright (c) 2005 Daniel Stenberg
*
* 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"
int ares_getsock(const ares_channel_t *channel, ares_socket_t *socks,
int numsocks) /* size of the 'socks' array */
{
ares_slist_node_t *snode;
size_t sockindex = 0;
unsigned int bitmap = 0;
unsigned int setbits = 0xffffffff;
/* Are there any active queries? */
size_t active_queries;
if (channel == NULL || numsocks <= 0) {
return 0;
}
ares_channel_lock(channel);
active_queries = ares_llist_len(channel->all_queries);
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 *node;
for (node = ares_llist_node_first(server->connections); node != NULL;
node = ares_llist_node_next(node)) {
const ares_conn_t *conn = ares_llist_node_val(node);
if (sockindex >= (size_t)numsocks || sockindex >= ARES_GETSOCK_MAXNUM) {
break;
}
/* We only need to register interest in UDP sockets if we have
* outstanding queries.
*/
if (!active_queries && !(conn->flags & ARES_CONN_FLAG_TCP)) {
continue;
}
socks[sockindex] = conn->fd;
if (active_queries || conn->flags & ARES_CONN_FLAG_TCP) {
bitmap |= ARES_GETSOCK_READABLE(setbits, sockindex);
}
if (conn->state_flags & ARES_CONN_STATE_WRITE) {
/* then the tcp socket is also writable! */
bitmap |= ARES_GETSOCK_WRITABLE(setbits, sockindex);
}
sockindex++;
}
}
ares_channel_unlock(channel);
return (int)bitmap;
}
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