repos/Smersh/Daemon.cpp

// Smersh
//
// Douglas Thrift
//
// $Id$

#include "Daemon.hpp"

string Daemon::crlf("\r\n");

void Daemon::serve(bool fork, Daemon* self)
{
        api::TcpSocket server;

        server.Create();
        server.SetAddress(api::InternetAddress(api::InternetAddress::Any, port));

        if (fork)
        {
                switch (pid_t pid = ::fork())
                {
                case -1:
                        cerr << program << ": fork()\n";

                        exit(1);
                case 0:
                        break;
                default:
                        cout << pid << '\n';
                        return;
                }
        }

        server.Listen(50);

        while (true)
        {
                Client* client (new Client);

                server.Accept(client->socket, &client->ip);

                api::Thread thread(etl::BindAll(&Daemon::handle, self, client));
        }
}

Daemon::Status Daemon::request(istream& sin, Environment& env, ostream& post,
        ostream& log)
{
        string line;
        Matcher request("^([A-Z]+) (.*?)(\\?.+)? HTTP/(\\d+)\\.(\\d+)$");

        getline(sin, line);

        log << '"' << line << "\" ";

        env.put("HTTP_REFERER=-");
        env.put("HTTP_USER_AGENT=-");

        if (line == request)
        {
                if (lexical_cast<unsigned>(request[4]) > 1) return version;

                Matcher method("^GET|HEAD|POST$");

                if (request[1] != method) return notImplemented;

                env.set("REQUEST_METHOD", method);
                env.set("REQUEST_URI", request[2] + request[3]);

                if (!request[3].empty()) env.set("QUERY_STRING", request[3].substr(1));

                headers(sin, env);

                if (env.get("HTTP_HOST").empty()) return bad;
                if (method[0] == "POST") return message(sin, env, post);

                return ok;
        }

        return bad;
}

void Daemon::response(ostream& sout, Status status)
{
        sout << "HTTP/1.1 " << status << ' ' << reason(status) << crlf << "Date: "
                << date() << crlf << "Server: " << server() << crlf
                << "Connection: close" << crlf;
}

string Daemon::reason(Status status)
{
        ostringstream sout;

        switch (status)
        {
        case ok:
                sout << "OK";
                break;
        case found:
                sout << "Found";
                break;
        case seeOther:
                sout << "See Other";
                break;
        case bad:
                sout << "Bad Request";
                break;
        case notFound:
                sout << "Not Found";
                break;
        case lengthRequired:
                sout << "Length Required";
                break;
        case mediaType:
                sout << "Unsupported Media Type";
                break;
        case serverError:
                sout << "Internal Server Error";
                break;
        case notImplemented:
                sout << "Not Implemented";
                break;
        case version:
                sout << "HTTP Version not supported";
        }

        return sout.str();
}

string Daemon::server()
{
        utsname system;

        uname(&system);

        return string("Smersh/0.9 (") + system.sysname + ')';
}

string Daemon::server(const Environment& env)
{
        ostringstream server;
        string port(env.get("SERVER_PORT"));

        server << this->server() << " Server at " << env.get("SERVER_NAME") << " Po"
                << "rt " << (port.empty() ? lexical_cast<string>(this->port) : port);

        return server.str();
}

streamsize Daemon::error(ostream& sout, Status status, const Environment& env)
{
        string reason(this->reason(status));
        ostringstream error;

        error << "<html><head><title>" << status << ' ' << reason << "</title></hea"
                << "d><body><h1>" << reason << "</h1><p>Mistakes were made, deal with t"
                << "hem.</p><hr /><address>" << server(env) << "</address></body></html"
                << ">\r\n";
        sout << "Content-Length: " << error.str().length() << crlf
                << "Content-Type: text/html; charset=UTF-8\r\n\r\n" << error.str();

        return error.str().size();
}

string Daemon::date(bool log)
{
        time_t now(time(NULL));
        tm time;

        if (log) localtime_r(&now, &time); else gmtime_r(&now, &time);

        const char* format(log ? "[%m/%d/%Y:%T %z]" : "%a, %d %b %Y %T GMT");
        char when[log ? 29 : 30];

        strftime(when, log ? 29 : 30, format, &time);

        return when;
}

int Daemon::handle(Client* client)
{
        ios::InputOutputStreamBufAdapter adapter(client->socket);
        iostream sio(&adapter);
        Environment env;
        stringstream post;
        ostringstream log;
        Status code(request(sio, env, post, log));

        if (env.get("REQUEST_URI") == "/favicon.ico") code = notFound;

        response(sio, code);

        bool head(env.get("REQUEST_METHOD") == "HEAD");
        streamsize sent(0);

        if (code == ok && env.get("REQUEST_URI") == "/robots.txt")
        {
                sio << "Content-Length: 28\r\nContent-Type: text/plain; charset=UTF-8\r"
                        << "\n\r\n";

                if (!head) { sio << "User-agent: *\r\nDisallow: /\r\n"; sent = 28; }
        }
        else if (code == ok && !head)
        {
                ostringstream content;
                Smersh smersh(post, content, env);

                sio << "Content-Length: " << content.str().length() << crlf
                        << "Content-Type: text/html; charset=UTF-8\r\n\r\n";

                sio.write(content.str().data(), content.str().size());

                sent = content.str().size();
        }
        else if (head) sio << "Content-Type: text/html; charset=UTF-8\r\n\r\n";
        else sent = error(sio, code, env);

        ofstream fout(this->log.c_str(), ios_base::app);

        fout << inet_ntoa(client->ip->sin_addr) << " - - " << date(true) << ' '
                << log.str() << code << ' ' << lexical_cast<string>(sent) << " \""
                << env.get("HTTP_REFERER") << "\" \"" << env.get("HTTP_USER_AGENT")
                << "\"\n";
        sio << flush;

        client->socket.ShutdownWrite();

        delete client;
}

void Daemon::headers(istream& sin, Environment& env)
{
        do
        {
                string line;

                getline(sin, line);

                if (line.empty()) break;

                istringstream input(line);
                string name, value;

                std::getline(input, name, ':');
                getline(input, value);

                for (char next(sin.peek()); next == ' ' || next == '\t'; next =
                        sin.peek())
                {
                        getline(sin, line);

                        value += ' ' + line;
                }

                Matcher matcher("^\\s*(.+)\\s*$");

                if (name == "Content-Length")
                {
                        if (value == matcher) env.set("CONTENT_LENGTH", matcher[1]);
                }
                else if (name == "Content-Type")
                {
                        if (value == matcher) env.set("CONTENT_TYPE", matcher[1]);
                }
                else if (name == "Host")
                {
                        Matcher matcher("^\\s*(.+?)(:[0-9]+)?\\s*$");

                        if (value == matcher)
                        {
                                bool port(matcher.size() > 2);

                                env.set("HTTP_HOST", matcher[1] + (port ? matcher[2] : ""));
                                env.set("SERVER_NAME", matcher[1]);

                                if (port) env.set("SERVER_PORT", matcher[2].substr(1));
                        }
                }
                else if (name == "Referer")
                {
                        if (value == matcher) env.set("HTTP_REFERER", matcher[1]);
                }
                else if (name == "User-Agent")
                {
                        if (value == matcher) env.set("HTTP_USER_AGENT", matcher[1]);
                }
        }
        while (sin.good());
}

Daemon::Status Daemon::message(istream& sin, Environment& env, ostream& post)
{
        string contentLength(env.get("CONTENT_LENGTH"));

        if (env.get("CONTENT_TYPE") != "application/x-www-form-urlencoded") return
                mediaType;
        if (contentLength.empty()) return lengthRequired;

        streamsize length(lexical_cast<streamsize>(contentLength));
        char* content(new char[length]);

        sin.read(content, length);
        post.write(content, length);

        delete [] content;

        return ok;
}
Revision:	182
Committed:	2004-07-03T06:52:04-07:00 (20 years, 11 months ago) by Douglas Thrift
File size:	6543 byte(s)
Log Message:	Redirector redirects, nicely!
#	User	Rev	Content
1	Douglas Thrift	164	// Smersh
2			//
3			// Douglas Thrift
4			//
5			// $Id$
6
7			#include "Daemon.hpp"
8
9	Douglas Thrift	175	string Daemon::crlf("\r\n");
10
11	Douglas Thrift	181	void Daemon::serve(bool fork, Daemon* self)
12	Douglas Thrift	164	{
13	Douglas Thrift	174	api::TcpSocket server;
14	Douglas Thrift	172
15	Douglas Thrift	174	server.Create();
16			server.SetAddress(api::InternetAddress(api::InternetAddress::Any, port));
17
18	Douglas Thrift	172	if (fork)
19			{
20	Douglas Thrift	179	switch (pid_t pid = ::fork())
21	Douglas Thrift	172	{
22			case -1:
23			cerr << program << ": fork()\n";
24
25			exit(1);
26			case 0:
27			break;
28			default:
29	Douglas Thrift	179	cout << pid << '\n';
30	Douglas Thrift	172	return;
31			}
32			}
33
34	Douglas Thrift	174	server.Listen(50);
35	Douglas Thrift	173
36			while (true)
37			{
38	Douglas Thrift	179	Client* client (new Client);
39	Douglas Thrift	173
40	Douglas Thrift	179	server.Accept(client->socket, &client->ip);
41	Douglas Thrift	174
42			api::Thread thread(etl::BindAll(&Daemon::handle, self, client));
43	Douglas Thrift	173	}
44	Douglas Thrift	164	}
45
46	Douglas Thrift	175	Daemon::Status Daemon::request(istream& sin, Environment& env, ostream& post,
47			ostream& log)
48			{
49			string line;
50	Douglas Thrift	180	Matcher request("^([A-Z]+) (.*?)(\\?.+)? HTTP/(\\d+)\\.(\\d+)$");
51	Douglas Thrift	175
52			getline(sin, line);
53
54			log << '"' << line << "\" ";
55
56	Douglas Thrift	176	env.put("HTTP_REFERER=-");
57			env.put("HTTP_USER_AGENT=-");
58
59	Douglas Thrift	175	if (line == request)
60			{
61	Douglas Thrift	180	if (lexical_cast<unsigned>(request[4]) > 1) return version;
62	Douglas Thrift	175
63	Douglas Thrift	176	Matcher method("^GET\|HEAD\|POST$");
64	Douglas Thrift	175
65	Douglas Thrift	176	if (request[1] != method) return notImplemented;
66	Douglas Thrift	175
67	Douglas Thrift	176	env.set("REQUEST_METHOD", method);
68	Douglas Thrift	180	env.set("REQUEST_URI", request[2] + request[3]);
69	Douglas Thrift	175
70	Douglas Thrift	180	if (!request[3].empty()) env.set("QUERY_STRING", request[3].substr(1));
71	Douglas Thrift	175
72	Douglas Thrift	176	headers(sin, env);
73	Douglas Thrift	175
74	Douglas Thrift	181	if (env.get("HTTP_HOST").empty()) return bad;
75	Douglas Thrift	176	if (method[0] == "POST") return message(sin, env, post);
76	Douglas Thrift	175
77			return ok;
78			}
79
80	Douglas Thrift	180	return bad;
81	Douglas Thrift	175	}
82
83	Douglas Thrift	176	void Daemon::response(ostream& sout, Status status)
84	Douglas Thrift	175	{
85	Douglas Thrift	177	sout << "HTTP/1.1 " << status << ' ' << reason(status) << crlf << "Date: "
86	Douglas Thrift	178	<< date() << crlf << "Server: " << server() << crlf
87	Douglas Thrift	176	<< "Connection: close" << crlf;
88			}
89
90	Douglas Thrift	180	string Daemon::reason(Status status)
91			{
92			ostringstream sout;
93
94			switch (status)
95			{
96			case ok:
97			sout << "OK";
98			break;
99			case found:
100			sout << "Found";
101			break;
102			case seeOther:
103			sout << "See Other";
104			break;
105			case bad:
106			sout << "Bad Request";
107			break;
108			case notFound:
109			sout << "Not Found";
110			break;
111			case lengthRequired:
112			sout << "Length Required";
113			break;
114			case mediaType:
115			sout << "Unsupported Media Type";
116			break;
117			case serverError:
118			sout << "Internal Server Error";
119			break;
120			case notImplemented:
121			sout << "Not Implemented";
122			break;
123			case version:
124			sout << "HTTP Version not supported";
125			}
126
127			return sout.str();
128			}
129
130	Douglas Thrift	178	string Daemon::server()
131			{
132			utsname system;
133
134			uname(&system);
135
136			return string("Smersh/0.9 (") + system.sysname + ')';
137			}
138
139	Douglas Thrift	181	string Daemon::server(const Environment& env)
140	Douglas Thrift	176	{
141	Douglas Thrift	181	ostringstream server;
142			string port(env.get("SERVER_PORT"));
143
144			server << this->server() << " Server at " << env.get("SERVER_NAME") << " Po"
145			<< "rt " << (port.empty() ? lexical_cast<string>(this->port) : port);
146
147			return server.str();
148			}
149
150			streamsize Daemon::error(ostream& sout, Status status, const Environment& env)
151			{
152	Douglas Thrift	177	string reason(this->reason(status));
153			ostringstream error;
154
155			error << "<html><head><title>" << status << ' ' << reason << "</title></hea"
156			<< "d><body><h1>" << reason << "</h1><p>Mistakes were made, deal with t"
157	Douglas Thrift	181	<< "hem.</p><hr /><address>" << server(env) << "</address></body></html"
158			<< ">\r\n";
159	Douglas Thrift	177	sout << "Content-Length: " << error.str().length() << crlf
160			<< "Content-Type: text/html; charset=UTF-8\r\n\r\n" << error.str();
161
162			return error.str().size();
163	Douglas Thrift	175	}
164
165	Douglas Thrift	176	string Daemon::date(bool log)
166			{
167			time_t now(time(NULL));
168			tm time;
169
170			if (log) localtime_r(&now, &time); else gmtime_r(&now, &time);
171
172			const char* format(log ? "[%m/%d/%Y:%T %z]" : "%a, %d %b %Y %T GMT");
173			char when[log ? 29 : 30];
174
175			strftime(when, log ? 29 : 30, format, &time);
176
177			return when;
178			}
179
180	Douglas Thrift	179	int Daemon::handle(Client* client)
181	Douglas Thrift	177	{
182	Douglas Thrift	179	ios::InputOutputStreamBufAdapter adapter(client->socket);
183	Douglas Thrift	175	iostream sio(&adapter);
184			Environment env;
185			stringstream post;
186			ostringstream log;
187			Status code(request(sio, env, post, log));
188	Douglas Thrift	174
189	Douglas Thrift	180	if (env.get("REQUEST_URI") == "/favicon.ico") code = notFound;
190
191	Douglas Thrift	176	response(sio, code);
192	Douglas Thrift	174
193	Douglas Thrift	177	bool head(env.get("REQUEST_METHOD") == "HEAD");
194			streamsize sent(0);
195
196	Douglas Thrift	181	if (code == ok && env.get("REQUEST_URI") == "/robots.txt")
197	Douglas Thrift	176	{
198	Douglas Thrift	181	sio << "Content-Length: 28\r\nContent-Type: text/plain; charset=UTF-8\r"
199			<< "\n\r\n";
200
201			if (!head) { sio << "User-agent: *\r\nDisallow: /\r\n"; sent = 28; }
202			}
203			else if (code == ok && !head)
204			{
205	Douglas Thrift	180	ostringstream content;
206	Douglas Thrift	181	Smersh smersh(post, content, env);
207	Douglas Thrift	176
208	Douglas Thrift	182	sio << "Content-Length: " << content.str().length() << crlf
209	Douglas Thrift	177	<< "Content-Type: text/html; charset=UTF-8\r\n\r\n";
210	Douglas Thrift	176
211	Douglas Thrift	182	sio.write(content.str().data(), content.str().size());
212	Douglas Thrift	177
213	Douglas Thrift	182	sent = content.str().size();
214	Douglas Thrift	176	}
215	Douglas Thrift	177	else if (head) sio << "Content-Type: text/html; charset=UTF-8\r\n\r\n";
216	Douglas Thrift	181	else sent = error(sio, code, env);
217	Douglas Thrift	176
218	Douglas Thrift	177	ofstream fout(this->log.c_str(), ios_base::app);
219	Douglas Thrift	175
220	Douglas Thrift	179	fout << inet_ntoa(client->ip->sin_addr) << " - - " << date(true) << ' '
221	Douglas Thrift	180	<< log.str() << code << ' ' << lexical_cast<string>(sent) << " \""
222			<< env.get("HTTP_REFERER") << "\" \"" << env.get("HTTP_USER_AGENT")
223			<< "\"\n";
224	Douglas Thrift	178	sio << flush;
225	Douglas Thrift	177
226	Douglas Thrift	179	client->socket.ShutdownWrite();
227	Douglas Thrift	178
228	Douglas Thrift	174	delete client;
229	Douglas Thrift	164	}
230	Douglas Thrift	176
231			void Daemon::headers(istream& sin, Environment& env)
232			{
233			do
234			{
235			string line;
236
237			getline(sin, line);
238
239			if (line.empty()) break;
240
241			istringstream input(line);
242			string name, value;
243
244	Douglas Thrift	178	std::getline(input, name, ':');
245	Douglas Thrift	176	getline(input, value);
246
247			for (char next(sin.peek()); next == ' ' \|\| next == '\t'; next =
248			sin.peek())
249			{
250			getline(sin, line);
251
252			value += ' ' + line;
253			}
254
255			Matcher matcher("^\\s(.+)\\s$");
256
257			if (name == "Content-Length")
258			{
259			if (value == matcher) env.set("CONTENT_LENGTH", matcher[1]);
260			}
261			else if (name == "Content-Type")
262			{
263			if (value == matcher) env.set("CONTENT_TYPE", matcher[1]);
264			}
265	Douglas Thrift	181	else if (name == "Host")
266			{
267			Matcher matcher("^\\s(.+?)(:[0-9]+)?\\s$");
268
269			if (value == matcher)
270			{
271			bool port(matcher.size() > 2);
272
273			env.set("HTTP_HOST", matcher[1] + (port ? matcher[2] : ""));
274			env.set("SERVER_NAME", matcher[1]);
275
276			if (port) env.set("SERVER_PORT", matcher[2].substr(1));
277			}
278			}
279	Douglas Thrift	176	else if (name == "Referer")
280			{
281			if (value == matcher) env.set("HTTP_REFERER", matcher[1]);
282			}
283			else if (name == "User-Agent")
284			{
285			if (value == matcher) env.set("HTTP_USER_AGENT", matcher[1]);
286			}
287			}
288			while (sin.good());
289			}
290
291			Daemon::Status Daemon::message(istream& sin, Environment& env, ostream& post)
292			{
293			string contentLength(env.get("CONTENT_LENGTH"));
294	Douglas Thrift	177
295	Douglas Thrift	176	if (env.get("CONTENT_TYPE") != "application/x-www-form-urlencoded") return
296			mediaType;
297			if (contentLength.empty()) return lengthRequired;
298
299			streamsize length(lexical_cast<streamsize>(contentLength));
300			char* content(new char[length]);
301
302			sin.read(content, length);
303			post.write(content, length);
304
305			delete [] content;
306
307			return ok;
308			}