Emery Hemingway
e36ddaf659
Rename LwIP library in preparation for removal of LwIP libc plugin. The current LwIP library will be replaced with a new version stripped of its synchronous socket support. The next version will be incompatible with the current, so removing 'lwip.lib.so' completely for a period makes it easy to identify legacy users. Fix #2797
158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
/*
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* \brief Minimal HTTP server lwIP demonstration
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* \author lwIP Team
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* \author Stefan Kalkowski
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* \date 2009-10-23
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*
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* This small example shows how to use the LwIP in Genode directly.
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* If you simply want to use LwIP's socket API, you might use
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* Genode's libc together with its LwIP backend, especially useful
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* when porting legacy code.
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*/
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/*
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* Copyright (C) 2009-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/attached_rom_dataspace.h>
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#include <base/log.h>
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#include <libc/component.h>
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#include <nic/packet_allocator.h>
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#include <util/string.h>
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/* LwIP includes */
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extern "C" {
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#include <lwip/sockets.h>
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#include <lwip/api.h>
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}
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#include <lwip_legacy/genode.h>
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using Response = Genode::String<1024>;
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/**
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* Handle a single client's request.
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*
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* \param conn socket connected to the client
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*/
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void http_server_serve(int conn, Response & response)
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{
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char buf[1024];
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ssize_t buflen;
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/* Read the data from the port, blocking if nothing yet there.
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We assume the request (the part we care about) is in one packet */
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buflen = lwip_recv(conn, buf, 1024, 0);
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Genode::log("Packet received!");
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/* Ignore all receive errors */
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if (buflen > 0) {
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/* Is this an HTTP GET command? (only check the first 5 chars, since
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there are other formats for GET, and we're keeping it very simple)*/
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if (buflen >= 5 &&
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buf[0] == 'G' &&
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buf[1] == 'E' &&
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buf[2] == 'T' &&
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buf[3] == ' ' &&
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buf[4] == '/' ) {
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Genode::log("Will send response");
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/* Send our HTML page */
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lwip_send(conn, response.string(), response.length(), 0);
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}
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}
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}
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struct Initialization_failed {};
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#define ASSERT(cond, err) \
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if (!cond) { \
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Genode::error(err); \
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throw Initialization_failed(); \
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}
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void Libc::Component::construct(Libc::Env & env)
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{
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using namespace Genode;
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using Address = Genode::String<16>;
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enum { BUF_SIZE = Nic::Packet_allocator::DEFAULT_PACKET_SIZE * 128 };
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lwip_tcpip_init();
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uint32_t ip = 0;
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uint32_t nm = 0;
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uint32_t gw = 0;
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unsigned port = 0;
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Address ip_addr_str;
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Address netmask_str;
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Address gateway_str;
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Attached_rom_dataspace config(env, "config");
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Xml_node libc_node = env.libc_config();
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libc_node.attribute("ip_addr").value(&ip_addr_str);
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libc_node.attribute("netmask").value(&netmask_str);
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libc_node.attribute("gateway").value(&gateway_str);
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config.xml().attribute("port").value(&port);
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log("static network interface: ip=", ip_addr_str, " nm=", netmask_str, " gw=", gateway_str);
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ip = inet_addr(ip_addr_str.string());
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nm = inet_addr(netmask_str.string());
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gw = inet_addr(gateway_str.string());
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ASSERT((ip != INADDR_NONE && nm != INADDR_NONE && gw != INADDR_NONE),
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"Invalid network interface config.");
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/* Initialize network stack */
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ASSERT(!lwip_nic_init(ip, nm, gw, BUF_SIZE, BUF_SIZE),
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"got no IP address!");
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log("Create new socket ...");
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int s;
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ASSERT(((s = lwip_socket(AF_INET, SOCK_STREAM, 0)) >= 0),
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"no socket available!");
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static Response response(
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"HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n"
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"<html><head></head><body>"
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"<h1>HTTP server at %s:%u</h1>"
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"<p>This is a small test page.</body></html>",
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ip_addr_str.string(), port);
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log("Now, I will bind ...");
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struct sockaddr_in in_addr;
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in_addr.sin_family = AF_INET;
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in_addr.sin_port = htons(port);
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in_addr.sin_addr.s_addr = INADDR_ANY;
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ASSERT(!lwip_bind(s, (struct sockaddr*)&in_addr, sizeof(in_addr)),
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"bind failed!");
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log("Now, I will listen ...");
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ASSERT(!lwip_listen(s, 5),
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"listen failed!");
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log("Start the server loop ...");
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while (true) {
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struct sockaddr addr;
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socklen_t len = sizeof(addr);
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int client = lwip_accept(s, &addr, &len);
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if(client < 0) {
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warning("invalid socket from accept!");
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continue;
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}
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http_server_serve(client, response);
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lwip_close(client);
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}
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}
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