132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* WebSocket using CONNECT_ONLY
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* </DESC>
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <curl/curl.h>
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static int ping(CURL *curl, const char *send_payload)
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{
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size_t sent;
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CURLcode result =
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curl_ws_send(curl, send_payload, strlen(send_payload), &sent, 0,
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CURLWS_PING);
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return (int)result;
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}
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static int recv_pong(CURL *curl, const char *expected_payload)
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{
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size_t rlen;
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const struct curl_ws_frame *meta;
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char buffer[256];
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CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
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if(!result) {
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if(meta->flags & CURLWS_PONG) {
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int same = 0;
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fprintf(stderr, "ws: got PONG back\n");
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if(rlen == strlen(expected_payload)) {
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if(!memcmp(expected_payload, buffer, rlen)) {
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fprintf(stderr, "ws: got the same payload back\n");
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same = 1;
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}
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}
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if(!same)
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fprintf(stderr, "ws: did NOT get the same payload back\n");
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}
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else {
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fprintf(stderr, "recv_pong: got %u bytes rflags %x\n", (int)rlen,
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meta->flags);
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}
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}
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fprintf(stderr, "ws: curl_ws_recv returned %u, received %u\n",
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(unsigned int)result, (unsigned int)rlen);
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return (int)result;
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}
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static int recv_any(CURL *curl)
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{
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size_t rlen;
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const struct curl_ws_frame *meta;
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char buffer[256];
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CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
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if(result)
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return result;
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return 0;
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}
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/* close the connection */
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static void websocket_close(CURL *curl)
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{
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size_t sent;
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(void)curl_ws_send(curl, "", 0, &sent, 0, CURLWS_CLOSE);
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}
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static void websocket(CURL *curl)
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{
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int i = 0;
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do {
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recv_any(curl);
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if(ping(curl, "foobar"))
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return;
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if(recv_pong(curl, "foobar")) {
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return;
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}
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sleep(2);
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} while(i++ < 10);
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websocket_close(curl);
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}
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int main(void)
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{
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CURL *curl;
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CURLcode res;
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curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com");
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curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */
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/* Perform the request, res will get the return code */
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res = curl_easy_perform(curl);
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/* Check for errors */
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if(res != CURLE_OK)
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fprintf(stderr, "curl_easy_perform() failed: %s\n",
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curl_easy_strerror(res));
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else {
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/* connected and ready */
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websocket(curl);
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}
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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return 0;
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}
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