minimal-http-client-custom-headers

minimal-examples/http-client/README.md

@@ -1,6 +1,7 @@
 |name|demonstrates|
 ---|---
 minimal-http-client-certinfo|Shows how to gain detailed information on the peer certificate
+minimal-http-client-custom-headers|Shows how to send and receive custom headers (h1 only)
 minimal-http-client-hugeurl|Sends a > 2.5KB URL to warmcat.com
 minimal-http-client-multi|Connects to and reads https://warmcat.com, 8 times concurrently
 minimal-http-client-post|POSTs a form containing an uploaded file and a form variable, and captures the response

minimal-examples/http-client/minimal-http-client-custom-headers/CMakeLists.txt

@@ -0,0 +1,79 @@
+cmake_minimum_required(VERSION 2.8)
+include(CheckCSourceCompiles)
+
+set(SAMP lws-minimal-http-client-custom-headers)
+set(SRCS minimal-http-client-custom-headers.c)
+
+# If we are being built as part of lws, confirm current build config supports
+# reqconfig, else skip building ourselves.
+#
+# If we are being built externally, confirm installed lws was configured to
+# support reqconfig, else error out with a helpful message about the problem.
+#
+MACRO(require_lws_config reqconfig _val result)
+
+	if (DEFINED ${reqconfig})
+	if (${reqconfig})
+		set (rq 1)
+	else()
+		set (rq 0)
+	endif()
+	else()
+		set(rq 0)
+	endif()
+
+	if (${_val} EQUAL ${rq})
+		set(SAME 1)
+	else()
+		set(SAME 0)
+	endif()
+
+	if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
+		if (${_val})
+			message("${SAMP}: skipping as lws being built without ${reqconfig}")
+		else()
+			message("${SAMP}: skipping as lws built with ${reqconfig}")
+		endif()
+		set(${result} 0)
+	else()
+		if (LWS_WITH_MINIMAL_EXAMPLES)
+			set(MET ${SAME})
+		else()
+			CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
+			if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
+				set(HAS_${reqconfig} 0)
+			else()
+				set(HAS_${reqconfig} 1)
+			endif()
+			if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
+				set(MET 1)
+			else()
+				set(MET 0)
+			endif()
+		endif()
+		if (NOT MET)
+			if (${_val})
+				message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
+			else()
+				message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
+			endif()
+		endif()
+	
+	endif()
+ENDMACRO()
+
+
+set(requirements 1)
+require_lws_config(LWS_ROLE_H1 1 requirements)
+require_lws_config(LWS_WITHOUT_CLIENT 0 requirements)
+
+if (requirements)
+	add_executable(${SAMP} ${SRCS})
+
+	if (websockets_shared)
+		target_link_libraries(${SAMP} websockets_shared)
+		add_dependencies(${SAMP} websockets_shared)
+	else()
+		target_link_libraries(${SAMP} websockets)
+	endif()
+endif()

minimal-examples/http-client/minimal-http-client-custom-headers/README.md

@@ -0,0 +1,45 @@
+# lws minimal http client custom headers
+
+This http client application shows how to send and receive custom headers.
+
+This currently only works on http 1, so the app forces that even if h2 enables.
+
+## build
+
+```
+ $ cmake . && make
+```
+
+## usage
+
+Commandline option|Meaning
+---|---
+-d <loglevel>|Debug verbosity in decimal, eg, -d15
+-l| Connect to https://localhost:7681 and accept selfsigned cert
+-n|no TLS
+
+The app looks for a custom header "test-custom-header" sent by warmcat.com.
+
+```
+ $ ./lws-minimal-http-client-custom-headers
+[2019/03/11 05:46:45:7582] USER: LWS minimal http client Custom Headers [-d<verbosity>] [-l] [--h1]
+[2019/03/11 05:46:45:7671] NOTICE: created client ssl context for default
+[2019/03/11 05:46:46:7812] USER: Connected with server response: 200
+[2019/03/11 05:46:46:7812] NOTICE: callback_http: custom header: 'hello'
+[2019/03/11 05:46:46:7814] USER: RECEIVE_CLIENT_HTTP_READ: read 1024
+...
+```
+You can use the -n and -l to make this test app connect to localhost:7681 over http,
+and confirm the "dnt:1" header was sent either by tcpdump or by running the test
+server on :7681 with -d1151
+
+```
+[2019/03/11 05:48:53:6806] PARSER: WSI_TOKEN_NAME_PART 'd' 0x64 (role=0x20000000) wsi->lextable_pos=0
+[2019/03/11 05:48:53:6807] PARSER: WSI_TOKEN_NAME_PART 'n' 0x6E (role=0x20000000) wsi->lextable_pos=567
+[2019/03/11 05:48:53:6807] PARSER: WSI_TOKEN_NAME_PART 't' 0x74 (role=0x20000000) wsi->lextable_pos=-1
+[2019/03/11 05:48:53:6807] PARSER: WSI_TOKEN_NAME_PART ' ' 0x20 (role=0x20000000) wsi->lextable_pos=-1
+[2019/03/11 05:48:53:6807] PARSER: WSI_TOKEN_NAME_PART '1' 0x31 (role=0x20000000) wsi->lextable_pos=-1
+' 0x0D (role=0x20000000) wsi->lextable_pos=-1NAME_PART '
+[2019/03/11 05:48:53:6807] PARSER: WSI_TOKEN_NAME_PART '
+```
+

minimal-examples/http-client/minimal-http-client-custom-headers/minimal-http-client-custom-headers.c

@@ -0,0 +1,220 @@
+/*
+ * lws-minimal-http-client
+ *
+ * Copyright (C) 2018 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/ 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 int
+callback_http(struct lws *wsi, enum lws_callback_reasons reason,
+	      void *user, void *in, size_t len)
+{
+	char val[32];
+	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)");
+		client_wsi = NULL;
+		break;
+
+	case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
+	{
+		 unsigned char **p = (unsigned char **)in, *end = (*p) + len;
+
+		 /*
+		  * How to send a custom header in the request to the server
+		  */
+
+		 if (lws_add_http_header_by_name(wsi,
+				 (const unsigned char *)"dnt",
+				 (const unsigned char *)"1", 1, p, end))
+			 return -1;
+		break;
+	}
+
+	case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
+		status = lws_http_client_http_response(wsi);
+		lwsl_user("Connected with server response: %d\n", status);
+
+		/*
+		 * How to query custom headers (http 1.x only at the momemnt)
+		 *
+		 * warmcat.com sends a custom header "test-custom-header" for
+		 * testing, it has the fixed value "hello".
+		 */
+
+		n = lws_hdr_custom_length(wsi, "test-custom-header:", 19);
+		if (n < 0)
+			lwsl_notice("%s: Can't find test-custom-header\n",
+				    __func__);
+		else {
+			if (lws_hdr_custom_copy(wsi, val, sizeof(val),
+						"test-custom-header:", 19) < 0)
+				lwsl_notice("%s: custom header too long\n",
+					    __func__);
+			else
+				lwsl_notice("%s: custom header: '%s'\n",
+						__func__, val);
+		}
+		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:
+		lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
+		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,
+	},
+	{ NULL, NULL, 0, 0 }
+};
+
+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, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
+		   /*
+		    * For LLL_ verbosity above NOTICE to be built into lws,
+		    * lws must have been configured and built with
+		    * -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE
+		    *
+		    * | LLL_INFO   | LLL_PARSER  | LLL_HEADER | LLL_EXT |
+		    *   LLL_CLIENT | LLL_LATENCY | LLL_DEBUG
+		    */ ;
+
+	signal(SIGINT, sigint_handler);
+
+	if ((p = lws_cmdline_option(argc, argv, "-d")))
+		logs = atoi(p);
+
+	lws_set_log_level(logs, NULL);
+	lwsl_user("LWS minimal http client Custom Headers [-d<verbosity>] [-l] [--h1]\n");
+
+	memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
+	info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
+	info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
+	info.protocols = protocols;
+
+#if defined(LWS_WITH_MBEDTLS)
+	/*
+	 * 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;
+
+	if (!lws_cmdline_option(argc, argv, "-n"))
+		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";
+	}
+
+	/* currently custom headers receive only works with h1 */
+	i.alpn = "http/1.1";
+
+	i.path = "/";
+	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, 1000);
+
+	lws_context_destroy(context);
+	lwsl_user("Completed: %s\n", bad ? "failed" : "OK");
+
+	return bad;
+}

minimal-examples/http-client/minimal-http-client-custom-headers/warmcat.com.cer

@@ -0,0 +1,92 @@
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+-----END CERTIFICATE-----