minimal-examples/http-client/minimal-http-client-post/minimal-http-client-post.c - platform/external/libwebsockets - Git at Google

 /*
  * lws-minimal-http-client-post
  *
  * Written in 2010-2019 by Andy Green <[email protected]>
  *
  * 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 and POST.
  *
  * It POSTs both form data and a file to the form at
  * https://libwebsockets.org/testserver/formtest and dumps
  * the html page received generated by the POST handler.
  */

 #include <libwebsockets.h>
 #include <string.h>
 #include <signal.h>

 static int interrupted, bad = 0, status, count_clients = 1, completed;
 static struct lws *client_wsi[4];

 struct pss {
 	char body_part;
 };

 static int
 callback_http(struct lws *wsi, enum lws_callback_reasons reason,
 	      void *user, void *in, size_t len)
 {
 	struct pss *pss = (struct pss *)user;
 	char buf[LWS_PRE + 1024], *start = &buf[LWS_PRE], *p = start,
 		*end = &buf[sizeof(buf) - LWS_PRE - 1];
 	int n;

 	switch (reason) {

 	/* because we are protocols[0] ... */
 	case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
 		lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
 			 in ? (char *)in : "(null)");
 		bad = 1;
 		if (++completed == count_clients)
 			lws_cancel_service(lws_get_context(wsi));
 		break;

 	case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
 		for (n = 0; n < count_clients; n++)
 			if (client_wsi[n] == wsi) {
 				client_wsi[n] = NULL;
 				bad |= status != 200;
 				if (++completed == count_clients)
 					/* abort poll wait */
 					lws_cancel_service(lws_get_context(wsi));
 			}
 		break;

 	/* ...callbacks related to receiving the result... */

 	case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
 		status = (int)lws_http_client_http_response(wsi);
 		lwsl_user("Connected with server response: %d\n", status);
 		break;

 	case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
 		lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len);
 		lwsl_hexdump_notice(in, len);
 		return 0; /* don't passthru */

 	case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
 		n = sizeof(buf) - LWS_PRE;
 		if (lws_http_client_read(wsi, &p, &n) < 0)
 			return -1;

 		return 0; /* don't passthru */

 	case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
 		lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
 		bad |= status != 200;
 		/*
 		 * Do this to mark us as having processed the completion
 		 * so close doesn't duplicate (with pipelining, completion !=
 		 * connection close
 		 */
 		for (n = 0; n < count_clients; n++)
 			if (client_wsi[n] == wsi)
 				client_wsi[n] = NULL;
 		if (++completed == count_clients)
 			/* abort poll wait */
 			lws_cancel_service(lws_get_context(wsi));
 		break;

 	/* ...callbacks related to generating the POST... */

 	case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
 		/*
 		 * Tell lws we are going to send the body next...
 		 */
 		if (!lws_http_is_redirected_to_get(wsi)) {
 			lwsl_user("%s: doing POST flow\n", __func__);
 			lws_client_http_body_pending(wsi, 1);
 			lws_callback_on_writable(wsi);
 		} else
 			lwsl_user("%s: doing GET flow\n", __func__);
 		break;

 	case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE:
 		if (lws_http_is_redirected_to_get(wsi))
 			break;
 		lwsl_user("LWS_CALLBACK_CLIENT_HTTP_WRITEABLE\n");
 		n = LWS_WRITE_HTTP;

 		/*
 		 * For a small body like this, we could prepare it in memory and
 		 * send it all at once.  But to show how to handle, eg,
 		 * arbitrary-sized file payloads, or huge form-data fields, the
 		 * sending is done in multiple passes through the event loop.
 		 */

 		switch (pss->body_part++) {
 		case 0:
 			if (lws_client_http_multipart(wsi, "text", NULL, NULL,
 						      &p, end))
 				return -1;
 			/* notice every usage of the boundary starts with -- */
 			p += lws_snprintf(p, lws_ptr_diff_size_t(end, p), "my text field\xd\xa");
 			break;
 		case 1:
 			if (lws_client_http_multipart(wsi, "file", "myfile.txt",
 						      "text/plain", &p, end))
 				return -1;
 			p += lws_snprintf(p, lws_ptr_diff_size_t(end, p),
 					"This is the contents of the "
 					"uploaded file.\xd\xa"
 					"\xd\xa");
 			break;
 		case 2:
 			if (lws_client_http_multipart(wsi, NULL, NULL, NULL,
 						      &p, end))
 				return -1;
 			lws_client_http_body_pending(wsi, 0);
 			 /* necessary to support H2, it means we will write no
 			  * more on this stream */
 			n = LWS_WRITE_HTTP_FINAL;
 			break;

 		default:
 			/*
 			 * We can get extra callbacks here, if nothing to do,
 			 * then do nothing.
 			 */
 			return 0;
 		}

 		if (lws_write(wsi, (uint8_t *)start, lws_ptr_diff_size_t(p, start), (enum lws_write_protocol)n)
 				!= lws_ptr_diff(p, start))
 			return 1;

 		if (n != LWS_WRITE_HTTP_FINAL)
 			lws_callback_on_writable(wsi);

 		return 0;

 	default:
 		break;
 	}

 	return lws_callback_http_dummy(wsi, reason, user, in, len);
 }

 static const struct lws_protocols protocols[] = {
 	{
 		"http",
 		callback_http,
 		sizeof(struct pss),
 		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;
 	const char *p;
 	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 - POST [-d<verbosity>] [-l] [--h1]\n");

 	if (lws_cmdline_option(argc, argv, "-m"))
 		count_clients = LWS_ARRAY_SIZE(client_wsi);

 	info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
 	info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
 	info.protocols = protocols;
 	/*
 	 * 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 = (unsigned int)(1 + count_clients + 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.
 	 */
 	if (!lws_cmdline_option(argc, argv, "-l"))
 		info.client_ssl_ca_filepath = "./libwebsockets.org.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 | LCCSCF_HTTP_MULTIPART_MIME;

 	if (lws_cmdline_option(argc, argv, "-l")) {
 		i.port = 7681;
 		i.address = "localhost";
 		i.ssl_connection |= LCCSCF_ALLOW_SELFSIGNED;
 		i.path = "/formtest";
 	} else {
 		i.port = 443;
 		i.address = "libwebsockets.org";
 		i.path = "/testserver/formtest";
 	}

 	if (lws_cmdline_option(argc, argv, "--form1"))
 		i.path = "/form1";

 	if ((p = lws_cmdline_option(argc, argv, "--port")))
 		i.port = atoi(p);

 	i.host = i.address;
 	i.origin = i.address;
 	i.method = "POST";

 	/* force h1 even if h2 available */
 	if (lws_cmdline_option(argc, argv, "--h1"))
 		i.alpn = "http/1.1";

 	i.protocol = protocols[0].name;

 	for (n = 0; n < count_clients; n++) {
 		i.pwsi = &client_wsi[n];
 		lwsl_notice("%s: connecting to %s:%d\n", __func__,
 			    i.address, i.port);
 		if (!lws_client_connect_via_info(&i))
 			completed++;
 	}

 	while (n >= 0 && completed != count_clients && !interrupted)
 		n = lws_service(context, 0);

 	lws_context_destroy(context);
 	lwsl_user("Completed: %s\n", bad ? "failed" : "OK");

 	return bad;
 }
	/*
	* lws-minimal-http-client-post
	*
	* Written in 2010-2019 by Andy Green <[email protected]>
	*
	* 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 and POST.
	*
	* It POSTs both form data and a file to the form at
	* https://libwebsockets.org/testserver/formtest and dumps
	* the html page received generated by the POST handler.
	*/

	#include <libwebsockets.h>
	#include <string.h>
	#include <signal.h>

	static int interrupted, bad = 0, status, count_clients = 1, completed;
	static struct lws *client_wsi[4];

	struct pss {
	char body_part;
	};

	static int
	callback_http(struct lws *wsi, enum lws_callback_reasons reason,
	void user, void in, size_t len)
	{
	struct pss pss = (struct pss )user;
	char buf[LWS_PRE + 1024], start = &buf[LWS_PRE], p = start,
	*end = &buf[sizeof(buf) - LWS_PRE - 1];
	int n;

	switch (reason) {

	/* because we are protocols[0] ... */
	case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
	lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
	in ? (char *)in : "(null)");
	bad = 1;
	if (++completed == count_clients)
	lws_cancel_service(lws_get_context(wsi));
	break;

	case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
	for (n = 0; n < count_clients; n++)
	if (client_wsi[n] == wsi) {
	client_wsi[n] = NULL;
	bad \|= status != 200;
	if (++completed == count_clients)
	/* abort poll wait */
	lws_cancel_service(lws_get_context(wsi));
	}
	break;

	/* ...callbacks related to receiving the result... */

	case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
	status = (int)lws_http_client_http_response(wsi);
	lwsl_user("Connected with server response: %d\n", status);
	break;

	case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
	lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len);
	lwsl_hexdump_notice(in, len);
	return 0; /* don't passthru */

	case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
	n = sizeof(buf) - LWS_PRE;
	if (lws_http_client_read(wsi, &p, &n) < 0)
	return -1;

	return 0; /* don't passthru */

	case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
	lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
	bad \|= status != 200;
	/*
	* Do this to mark us as having processed the completion
	* so close doesn't duplicate (with pipelining, completion !=
	* connection close
	*/
	for (n = 0; n < count_clients; n++)
	if (client_wsi[n] == wsi)
	client_wsi[n] = NULL;
	if (++completed == count_clients)
	/* abort poll wait */
	lws_cancel_service(lws_get_context(wsi));
	break;

	/* ...callbacks related to generating the POST... */

	case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
	/*
	* Tell lws we are going to send the body next...
	*/
	if (!lws_http_is_redirected_to_get(wsi)) {
	lwsl_user("%s: doing POST flow\n", __func__);
	lws_client_http_body_pending(wsi, 1);
	lws_callback_on_writable(wsi);
	} else
	lwsl_user("%s: doing GET flow\n", __func__);
	break;

	case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE:
	if (lws_http_is_redirected_to_get(wsi))
	break;
	lwsl_user("LWS_CALLBACK_CLIENT_HTTP_WRITEABLE\n");
	n = LWS_WRITE_HTTP;

	/*
	* For a small body like this, we could prepare it in memory and
	* send it all at once. But to show how to handle, eg,
	* arbitrary-sized file payloads, or huge form-data fields, the
	* sending is done in multiple passes through the event loop.
	*/

	switch (pss->body_part++) {
	case 0:
	if (lws_client_http_multipart(wsi, "text", NULL, NULL,
	&p, end))
	return -1;
	/* notice every usage of the boundary starts with -- */
	p += lws_snprintf(p, lws_ptr_diff_size_t(end, p), "my text field\xd\xa");
	break;
	case 1:
	if (lws_client_http_multipart(wsi, "file", "myfile.txt",
	"text/plain", &p, end))
	return -1;
	p += lws_snprintf(p, lws_ptr_diff_size_t(end, p),
	"This is the contents of the "
	"uploaded file.\xd\xa"
	"\xd\xa");
	break;
	case 2:
	if (lws_client_http_multipart(wsi, NULL, NULL, NULL,
	&p, end))
	return -1;
	lws_client_http_body_pending(wsi, 0);
	/* necessary to support H2, it means we will write no
	* more on this stream */
	n = LWS_WRITE_HTTP_FINAL;
	break;

	default:
	/*
	* We can get extra callbacks here, if nothing to do,
	* then do nothing.
	*/
	return 0;
	}

	if (lws_write(wsi, (uint8_t *)start, lws_ptr_diff_size_t(p, start), (enum lws_write_protocol)n)
	!= lws_ptr_diff(p, start))
	return 1;

	if (n != LWS_WRITE_HTTP_FINAL)
	lws_callback_on_writable(wsi);

	return 0;

	default:
	break;
	}

	return lws_callback_http_dummy(wsi, reason, user, in, len);
	}

	static const struct lws_protocols protocols[] = {
	{
	"http",
	callback_http,
	sizeof(struct pss),
	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;
	const char *p;
	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 - POST [-d<verbosity>] [-l] [--h1]\n");

	if (lws_cmdline_option(argc, argv, "-m"))
	count_clients = LWS_ARRAY_SIZE(client_wsi);

	info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
	info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
	info.protocols = protocols;
	/*
	* 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 = (unsigned int)(1 + count_clients + 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.
	*/
	if (!lws_cmdline_option(argc, argv, "-l"))
	info.client_ssl_ca_filepath = "./libwebsockets.org.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 \| LCCSCF_HTTP_MULTIPART_MIME;

	if (lws_cmdline_option(argc, argv, "-l")) {
	i.port = 7681;
	i.address = "localhost";
	i.ssl_connection \|= LCCSCF_ALLOW_SELFSIGNED;
	i.path = "/formtest";
	} else {
	i.port = 443;
	i.address = "libwebsockets.org";
	i.path = "/testserver/formtest";
	}

	if (lws_cmdline_option(argc, argv, "--form1"))
	i.path = "/form1";

	if ((p = lws_cmdline_option(argc, argv, "--port")))
	i.port = atoi(p);

	i.host = i.address;
	i.origin = i.address;
	i.method = "POST";

	/* force h1 even if h2 available */
	if (lws_cmdline_option(argc, argv, "--h1"))
	i.alpn = "http/1.1";

	i.protocol = protocols[0].name;

	for (n = 0; n < count_clients; n++) {
	i.pwsi = &client_wsi[n];
	lwsl_notice("%s: connecting to %s:%d\n", __func__,
	i.address, i.port);
	if (!lws_client_connect_via_info(&i))
	completed++;
	}

	while (n >= 0 && completed != count_clients && !interrupted)
	n = lws_service(context, 0);

	lws_context_destroy(context);
	lwsl_user("Completed: %s\n", bad ? "failed" : "OK");

	return bad;
	}