1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 /* <DESC>
25 * Websockets data echos
26 * </DESC>
27 */
28
29 /* curl stuff */
30 #include "curl_setup.h"
31 #include <curl/curl.h>
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 /* somewhat unix-specific */
38 #include <sys/time.h>
39 #include <unistd.h>
40
41 #ifdef USE_WEBSOCKETS
42
43 static
dump(const char * text,unsigned char * ptr,size_t size,char nohex)44 void dump(const char *text, unsigned char *ptr, size_t size,
45 char nohex)
46 {
47 size_t i;
48 size_t c;
49
50 unsigned int width = 0x10;
51
52 if(nohex)
53 /* without the hex output, we can fit more on screen */
54 width = 0x40;
55
56 fprintf(stderr, "%s, %lu bytes (0x%lx)\n",
57 text, (unsigned long)size, (unsigned long)size);
58
59 for(i = 0; i<size; i += width) {
60
61 fprintf(stderr, "%4.4lx: ", (unsigned long)i);
62
63 if(!nohex) {
64 /* hex not disabled, show it */
65 for(c = 0; c < width; c++)
66 if(i + c < size)
67 fprintf(stderr, "%02x ", ptr[i + c]);
68 else
69 fputs(" ", stderr);
70 }
71
72 for(c = 0; (c < width) && (i + c < size); c++) {
73 /* check for 0D0A; if found, skip past and start a new line of output */
74 if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
75 ptr[i + c + 1] == 0x0A) {
76 i += (c + 2 - width);
77 break;
78 }
79 fprintf(stderr, "%c",
80 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
81 /* check again for 0D0A, to avoid an extra \n if it's at width */
82 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
83 ptr[i + c + 2] == 0x0A) {
84 i += (c + 3 - width);
85 break;
86 }
87 }
88 fputc('\n', stderr); /* newline */
89 }
90 }
91
send_binary(CURL * curl,char * buf,size_t buflen)92 static CURLcode send_binary(CURL *curl, char *buf, size_t buflen)
93 {
94 size_t nwritten;
95 CURLcode result =
96 curl_ws_send(curl, buf, buflen, &nwritten, 0, CURLWS_BINARY);
97 fprintf(stderr, "ws: send_binary(len=%ld) -> %d, %ld\n",
98 (long)buflen, result, (long)nwritten);
99 return result;
100 }
101
recv_binary(CURL * curl,char * exp_data,size_t exp_len)102 static CURLcode recv_binary(CURL *curl, char *exp_data, size_t exp_len)
103 {
104 const struct curl_ws_frame *frame;
105 char recvbuf[256];
106 size_t r_offset, nread;
107 CURLcode result;
108
109 fprintf(stderr, "recv_binary: expected payload %ld bytes\n", (long)exp_len);
110 r_offset = 0;
111 while(1) {
112 result = curl_ws_recv(curl, recvbuf, sizeof(recvbuf), &nread, &frame);
113 if(result == CURLE_AGAIN) {
114 fprintf(stderr, "EAGAIN, sleep, try again\n");
115 usleep(100*1000);
116 continue;
117 }
118 fprintf(stderr, "ws: curl_ws_recv(offset=%ld, len=%ld) -> %d, %ld\n",
119 (long)r_offset, (long)sizeof(recvbuf), result, (long)nread);
120 if(result) {
121 return result;
122 }
123 if(!(frame->flags & CURLWS_BINARY)) {
124 fprintf(stderr, "recv_data: wrong frame, got %ld bytes rflags %x\n",
125 (long)nread, frame->flags);
126 return CURLE_RECV_ERROR;
127 }
128 if(frame->offset != (curl_off_t)r_offset) {
129 fprintf(stderr, "recv_data: frame offset, expected %ld, got %ld\n",
130 (long)r_offset, (long)frame->offset);
131 return CURLE_RECV_ERROR;
132 }
133 if(frame->bytesleft != (curl_off_t)(exp_len - r_offset - nread)) {
134 fprintf(stderr, "recv_data: frame bytesleft, expected %ld, got %ld\n",
135 (long)(exp_len - r_offset - nread), (long)frame->bytesleft);
136 return CURLE_RECV_ERROR;
137 }
138 if(r_offset + nread > exp_len) {
139 fprintf(stderr, "recv_data: data length, expected %ld, now at %ld\n",
140 (long)exp_len, (long)(r_offset + nread));
141 return CURLE_RECV_ERROR;
142 }
143 if(memcmp(exp_data + r_offset, recvbuf, nread)) {
144 fprintf(stderr, "recv_data: data differs, offset=%ld, len=%ld\n",
145 (long)r_offset, (long)nread);
146 dump("expected:", (unsigned char *)exp_data + r_offset, nread, 0);
147 dump("received:", (unsigned char *)recvbuf, nread, 0);
148 return CURLE_RECV_ERROR;
149 }
150 r_offset += nread;
151 if(r_offset >= exp_len) {
152 fprintf(stderr, "recv_data: frame complete\n");
153 break;
154 }
155 }
156 return CURLE_OK;
157 }
158
159 /* just close the connection */
websocket_close(CURL * curl)160 static void websocket_close(CURL *curl)
161 {
162 size_t sent;
163 CURLcode result =
164 curl_ws_send(curl, "", 0, &sent, 0, CURLWS_CLOSE);
165 fprintf(stderr,
166 "ws: curl_ws_send returned %u, sent %u\n", (int)result, (int)sent);
167 }
168
data_echo(CURL * curl,size_t plen_min,size_t plen_max)169 static CURLcode data_echo(CURL *curl, size_t plen_min, size_t plen_max)
170 {
171 CURLcode res = CURLE_OK;
172 size_t len;
173 char *send_buf;
174 size_t i;
175
176 send_buf = calloc(1, plen_max);
177 if(!send_buf)
178 return CURLE_OUT_OF_MEMORY;
179 for(i = 0; i < plen_max; ++i) {
180 send_buf[i] = (char)('0' + ((int)i % 10));
181 }
182
183 for(len = plen_min; len <= plen_max; ++len) {
184 res = send_binary(curl, send_buf, len);
185 if(res)
186 goto out;
187 res = recv_binary(curl, send_buf, len);
188 if(res) {
189 fprintf(stderr, "recv_data(len=%ld) -> %d\n", (long)len, res);
190 goto out;
191 }
192 }
193
194 out:
195 if(!res)
196 websocket_close(curl);
197 free(send_buf);
198 return res;
199 }
200
201 #endif
202
main(int argc,char * argv[])203 int main(int argc, char *argv[])
204 {
205 #ifdef USE_WEBSOCKETS
206 CURL *curl;
207 CURLcode res = CURLE_OK;
208 const char *url;
209 long l1, l2;
210 size_t plen_min, plen_max;
211
212
213 if(argc != 4) {
214 fprintf(stderr, "usage: ws-data url minlen maxlen\n");
215 return 2;
216 }
217 url = argv[1];
218 l1 = strtol(argv[2], NULL, 10);
219 if(l1 < 0) {
220 fprintf(stderr, "minlen must be >= 0, got %ld\n", l1);
221 return 2;
222 }
223 l2 = strtol(argv[3], NULL, 10);
224 if(l2 < 0) {
225 fprintf(stderr, "maxlen must be >= 0, got %ld\n", l2);
226 return 2;
227 }
228 plen_min = l1;
229 plen_max = l2;
230 if(plen_max < plen_min) {
231 fprintf(stderr, "maxlen must be >= minlen, got %ld-%ld\n",
232 (long)plen_min, (long)plen_max);
233 return 2;
234 }
235
236 curl_global_init(CURL_GLOBAL_ALL);
237
238 curl = curl_easy_init();
239 if(curl) {
240 curl_easy_setopt(curl, CURLOPT_URL, url);
241
242 /* use the callback style */
243 curl_easy_setopt(curl, CURLOPT_USERAGENT, "ws-data");
244 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
245 curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */
246 res = curl_easy_perform(curl);
247 fprintf(stderr, "curl_easy_perform() returned %u\n", (int)res);
248 if(res == CURLE_OK)
249 res = data_echo(curl, plen_min, plen_max);
250
251 /* always cleanup */
252 curl_easy_cleanup(curl);
253 }
254 curl_global_cleanup();
255 return (int)res;
256
257 #else /* USE_WEBSOCKETS */
258 (void)argc;
259 (void)argv;
260 fprintf(stderr, "websockets not enabled in libcurl\n");
261 return 1;
262 #endif /* !USE_WEBSOCKETS */
263 }
264
