manual proxy forcing api

add function to manually setup proxy. Useful on iOS where
 getenv doesn't return proxy settings

Simplified by AG

Signed-off-by: shys <shyswork@zoho.com>
Signed-off-by: Andy Green <andy@warmcat.com>

lib/libwebsockets.c

@@ -2268,6 +2268,52 @@ bail:
 	return NULL;
 }
 
+/**
+ * libwebsocket_set_proxy() - Setups proxy to libwebsocket_context.
+ * @context:	pointer to struct libwebsocket_context you want set proxy to
+ * @proxy: pointer to c string containing proxy in format address:port
+ *
+ * Returns 0 if proxy string was parsed and proxy was setup. 
+ * Returns -1 if @proxy is NULL or has incorrect format.
+ *
+ * This is only required if your OS does not provide the http_proxy
+ * enviroment variable (eg, OSX)
+ *
+ *   IMPORTANT! You should call this function right after creation of the
+ *   libwebsocket_context and before call to connect. If you call this
+ *   function after connect behavior is undefined.
+ *   This function will override proxy settings made on libwebsocket_context
+ *   creation with genenv() call.
+ */
+
+LWS_VISIBLE int
+libwebsocket_set_proxy(struct libwebsocket_context *context, const char *proxy)
+{
+	char *p;
+	
+	if (!proxy)
+		return -1;
+
+	strncpy(context->http_proxy_address, proxy,
+				sizeof(context->http_proxy_address) - 1);
+	context->http_proxy_address[
+				sizeof(context->http_proxy_address) - 1] = '\0';
+	
+	p = strchr(context->http_proxy_address, ':');
+	if (!p) {
+		lwsl_err("http_proxy needs to be ads:port\n");
+
+		return -1;
+	}
+	*p = '\0';
+	context->http_proxy_port = atoi(p + 1);
+	
+	lwsl_notice(" Proxy %s:%u\n", context->http_proxy_address,
+						context->http_proxy_port);
+
+	return 0;
+}
+
 /**
  * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
  *				  connection.

lib/libwebsockets.h

@@ -830,6 +830,9 @@ lwsl_emit_syslog(int level, const char *line);
 
 LWS_VISIBLE LWS_EXTERN struct libwebsocket_context *
 libwebsocket_create_context(struct lws_context_creation_info *info);
+	
+LWS_VISIBLE LWS_EXTERN int
+libwebsocket_set_proxy(struct libwebsocket_context *context, const char *proxy);
 
 LWS_VISIBLE LWS_EXTERN void
 libwebsocket_context_destroy(struct libwebsocket_context *context);