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/*
* lws-minimal-http-client hugeurl
*
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates the a minimal http client using lws.
*
* It visits https://warmcat.com/?fakeparam=<2KB> and receives the html
* page there. You can dump the page data by changing the #if 0 below.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
static int interrupted, bad = 1, status;
static struct lws *client_wsi;
static const char * const uri =
"/?fakeparam="
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000" /* 500 */
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111"
"11111111111111111111111111111111111111111111111111" /* 1000 */
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222"
"22222222222222222222222222222222222222222222222222" /* 1500 */
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333"
"33333333333333333333333333333333333333333333333333" /* 2000 */
;
static int
callback_http(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
client_wsi = NULL;
break;
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
status = (int)lws_http_client_http_response(wsi);
lwsl_user("Connected with server response: %d\n", status);
break;
/* chunks of chunked content, with header removed */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len);
#if 0 /* enable to dump the html */
{
const char *p = in;
while (len--)
if (*p < 0x7f)
putchar(*p++);
else
putchar('.');
}
#endif
return 0; /* don't passthru */
/* uninterpreted http content */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
{
char buffer[1024 + LWS_PRE];
char *px = buffer + LWS_PRE;
int lenx = sizeof(buffer) - LWS_PRE;
if (lws_http_client_read(wsi, &px, &lenx) < 0)
return -1;
}
return 0; /* don't passthru */
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
client_wsi = NULL;
bad = status != 200;
lws_cancel_service(lws_get_context(wsi)); /* abort poll wait */
break;
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
client_wsi = NULL;
bad = status != 200;
lws_cancel_service(lws_get_context(wsi)); /* abort poll wait */
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{
"http",
callback_http,
0, 0, 0, NULL, 0
},
LWS_PROTOCOL_LIST_TERM
};
static void
sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
struct lws_client_connect_info i;
struct lws_context *context;
int n = 0;
signal(SIGINT, sigint_handler);
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
lws_cmdline_option_handle_builtin(argc, argv, &info);
lwsl_user("LWS minimal http client hugeurl [-d <verbosity>] [-l] [--h1]\n");
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
info.protocols = protocols;
info.pt_serv_buf_size = 8192;
info.timeout_secs = 10;
info.connect_timeout_secs = 30;
/*
* since we know this lws context is only ever going to be used with
* one client wsis / fds / sockets at a time, let lws know it doesn't
* have to use the default allocations for fd tables up to ulimit -n.
* It will just allocate for 1 internal and 1 (+ 1 http2 nwsi) that we
* will use.
*/
info.fd_limit_per_thread = 1 + 1 + 1;
#if defined(LWS_WITH_MBEDTLS) || defined(USE_WOLFSSL)
/*
* OpenSSL uses the system trust store. mbedTLS has to be told which
* CA to trust explicitly.
*/
info.client_ssl_ca_filepath = "./warmcat.com.cer";
#endif
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
i.ssl_connection = LCCSCF_USE_SSL;
if (lws_cmdline_option(argc, argv, "-l")) {
i.port = 7681;
i.address = "localhost";
i.ssl_connection |= LCCSCF_ALLOW_SELFSIGNED;
} else {
i.port = 443;
i.address = "warmcat.com";
}
if (lws_cmdline_option(argc, argv, "--h1"))
i.alpn = "http/1.1";
i.path = uri;
i.host = i.address;
i.origin = i.address;
i.method = "GET";
i.protocol = protocols[0].name;
i.pwsi = &client_wsi;
lws_client_connect_via_info(&i);
while (n >= 0 && client_wsi && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
lwsl_user("Completed: %s\n", bad? "failed": "OK");
return bad;
}
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