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#include <stdio.h> #include <string.h> #include <unistd.h> #include <curl/curl.h> static int send_msg(CURL *curl, const char *send_payload) { size_t sent; CURLcode result = curl_ws_send(curl, send_payload, strlen(send_payload), &sent, 0,CURLWS_TEXT); return (int)result; } static int recv_pong(CURL *curl, const char *expected_payload) { size_t rlen; const struct curl_ws_frame *meta; char buffer[256]; CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta); if(!result) { if(meta->flags & CURLWS_PONG) { int same = 0; fprintf(stderr, "ws: got PONG back\n"); if(rlen == strlen(expected_payload)) { if(!memcmp(expected_payload, buffer, rlen)) { fprintf(stderr, "ws: got the same payload back\n"); same = 1; } } if(!same) fprintf(stderr, "ws: did NOT get the same payload back\n"); } else { fprintf(stderr, "recv_pong: got %u bytes rflags %x\n", (int)rlen, meta->flags); } } fprintf(stderr, "ws: curl_ws_recv returned %u, received %u\n", (unsigned int)result, (unsigned int)rlen); return (int)result; } static int recv_any(CURL *curl) { size_t rlen; const struct curl_ws_frame *meta; char buffer[256]; CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta); if(result) return result; return 0; } /* close the connection */ static void websocket_close(CURL *curl) { size_t sent; (void)curl_ws_send(curl, "", 0, &sent, 0, CURLWS_CLOSE); } static void websocket(CURL *curl) { int i = 0; do { recv_any(curl); if(recv_pong(curl, "foobar")) { return; } sleep(2); } while(i++ < 10); websocket_close(curl); } int main(void) { CURL *curl; CURLcode res; curl = curl_easy_init(); struct curl_slist *list = NULL; list = curl_slist_append(list, "Sec-WebSocket-Protocol: graphql-transport-ws"); list = curl_slist_append(list, "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36"); if(curl) { curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); curl_easy_setopt(curl, CURLOPT_URL, "wss://api.csgoroll.com/graphql"); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list); // curl_slist_free_all(list); curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */ /* Perform the request, res will get the return code */ res = curl_easy_perform(curl); /* Check for errors */ if(res != CURLE_OK) fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res)); else { send_msg(curl, "{\"type\":\"connection_init\"}"); /* connected and ready */ websocket(curl); } /* always cleanup */ curl_easy_cleanup(curl); } return 0; }