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.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));
                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::ToIoStream sio(&client->socket, &client->socket);
        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;

        return 0;
}

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:	241
Committed:	2004-09-11T20:59:56-07:00 (20 years, 9 months ago) by Douglas Thrift
File size:	6469 byte(s)
Log Message:	Meep!
#	Content
1	// Smersh
2	//
3	// Douglas Thrift
4	//
5	// $Id$
6
7	#include "Daemon.hpp"
8
9	string Daemon::crlf("\r\n");
10
11	void Daemon::serve(bool fork, Daemon* self)
12	{
13	api::TcpSocket server;
14
15	server.SetAddress(api::InternetAddress(api::InternetAddress::Any, port));
16
17	if (fork)
18	{
19	switch (pid_t pid = ::fork())
20	{
21	case -1:
22	cerr << program << ": fork()\n";
23
24	exit(1);
25	case 0:
26	break;
27	default:
28	cout << pid << '\n';
29	return;
30	}
31	}
32
33	server.Listen(50);
34
35	while (true)
36	{
37	Client* client (new Client(server));
38	api::Thread thread(etl::BindAll(&Daemon::handle, self, client));
39	}
40	}
41
42	Daemon::Status Daemon::request(istream& sin, Environment& env, ostream& post,
43	ostream& log)
44	{
45	string line;
46	Matcher request("^([A-Z]+) (.*?)(\\?.+)? HTTP/(\\d+)\\.(\\d+)$");
47
48	getline(sin, line);
49
50	log << '"' << line << "\" ";
51
52	env.put("HTTP_REFERER=-");
53	env.put("HTTP_USER_AGENT=-");
54
55	if (line == request)
56	{
57	if (lexical_cast<unsigned>(request[4]) > 1) return version;
58
59	Matcher method("^GET\|HEAD\|POST$");
60
61	if (request[1] != method) return notImplemented;
62
63	env.set("REQUEST_METHOD", method);
64	env.set("REQUEST_URI", request[2] + request[3]);
65
66	if (!request[3].empty()) env.set("QUERY_STRING", request[3].substr(1));
67
68	headers(sin, env);
69
70	if (env.get("HTTP_HOST").empty()) return bad;
71	if (method[0] == "POST") return message(sin, env, post);
72
73	return ok;
74	}
75
76	return bad;
77	}
78
79	void Daemon::response(ostream& sout, Status status)
80	{
81	sout << "HTTP/1.1 " << status << ' ' << reason(status) << crlf << "Date: "
82	<< date() << crlf << "Server: " << server() << crlf
83	<< "Connection: close" << crlf;
84	}
85
86	string Daemon::reason(Status status)
87	{
88	ostringstream sout;
89
90	switch (status)
91	{
92	case ok:
93	sout << "OK";
94	break;
95	case found:
96	sout << "Found";
97	break;
98	case seeOther:
99	sout << "See Other";
100	break;
101	case bad:
102	sout << "Bad Request";
103	break;
104	case notFound:
105	sout << "Not Found";
106	break;
107	case lengthRequired:
108	sout << "Length Required";
109	break;
110	case mediaType:
111	sout << "Unsupported Media Type";
112	break;
113	case serverError:
114	sout << "Internal Server Error";
115	break;
116	case notImplemented:
117	sout << "Not Implemented";
118	break;
119	case version:
120	sout << "HTTP Version not supported";
121	}
122
123	return sout.str();
124	}
125
126	string Daemon::server()
127	{
128	utsname system;
129
130	uname(&system);
131
132	return string("Smersh/0.9 (") + system.sysname + ')';
133	}
134
135	string Daemon::server(const Environment& env)
136	{
137	ostringstream server;
138	string port(env.get("SERVER_PORT"));
139
140	server << this->server() << " Server at " << env.get("SERVER_NAME") << " Po"
141	<< "rt " << (port.empty() ? lexical_cast<string>(this->port) : port);
142
143	return server.str();
144	}
145
146	streamsize Daemon::error(ostream& sout, Status status, const Environment& env)
147	{
148	string reason(this->reason(status));
149	ostringstream error;
150
151	error << "<html><head><title>" << status << ' ' << reason << "</title></hea"
152	<< "d><body><h1>" << reason << "</h1><p>Mistakes were made, deal with t"
153	<< "hem.</p><hr /><address>" << server(env) << "</address></body></html"
154	<< ">\r\n";
155	sout << "Content-Length: " << error.str().length() << crlf
156	<< "Content-Type: text/html; charset=UTF-8\r\n\r\n" << error.str();
157
158	return error.str().size();
159	}
160
161	string Daemon::date(bool log)
162	{
163	time_t now(time(NULL));
164	tm time;
165
166	if (log) localtime_r(&now, &time); else gmtime_r(&now, &time);
167
168	const char* format(log ? "[%m/%d/%Y:%T %z]" : "%a, %d %b %Y %T GMT");
169	char when[log ? 29 : 30];
170
171	strftime(when, log ? 29 : 30, format, &time);
172
173	return when;
174	}
175
176	int Daemon::handle(Client* client)
177	{
178	ios::ToIoStream sio(&client->socket, &client->socket);
179	Environment env;
180	stringstream post;
181	ostringstream log;
182	Status code(request(sio, env, post, log));
183
184	if (env.get("REQUEST_URI") == "/favicon.ico") code = notFound;
185
186	response(sio, code);
187
188	bool head(env.get("REQUEST_METHOD") == "HEAD");
189	streamsize sent(0);
190
191	if (code == ok && env.get("REQUEST_URI") == "/robots.txt")
192	{
193	sio << "Content-Length: 28\r\nContent-Type: text/plain; charset=UTF-8\r"
194	<< "\n\r\n";
195
196	if (!head) { sio << "User-agent: *\r\nDisallow: /\r\n"; sent = 28; }
197	}
198	else if (code == ok && !head)
199	{
200	ostringstream content;
201	Smersh smersh(post, content, env);
202
203	sio << "Content-Length: " << content.str().length() << crlf
204	<< "Content-Type: text/html; charset=UTF-8\r\n\r\n";
205
206	sio.write(content.str().data(), content.str().size());
207
208	sent = content.str().size();
209	}
210	else if (head) sio << "Content-Type: text/html; charset=UTF-8\r\n\r\n";
211	else sent = error(sio, code, env);
212
213	ofstream fout(this->log.c_str(), ios_base::app);
214
215	fout << inet_ntoa(client->ip->sin_addr) << " - - " << date(true) << ' '
216	<< log.str() << code << ' ' << lexical_cast<string>(sent) << " \""
217	<< env.get("HTTP_REFERER") << "\" \"" << env.get("HTTP_USER_AGENT")
218	<< "\"\n";
219	sio << flush;
220
221	client->socket.ShutdownWrite();
222
223	delete client;
224
225	return 0;
226	}
227
228	void Daemon::headers(istream& sin, Environment& env)
229	{
230	do
231	{
232	string line;
233
234	getline(sin, line);
235
236	if (line.empty()) break;
237
238	istringstream input(line);
239	string name, value;
240
241	std::getline(input, name, ':');
242	getline(input, value);
243
244	for (char next(sin.peek()); next == ' ' \|\| next == '\t'; next =
245	sin.peek())
246	{
247	getline(sin, line);
248
249	value += ' ' + line;
250	}
251
252	Matcher matcher("^\\s(.+)\\s$");
253
254	if (name == "Content-Length")
255	{
256	if (value == matcher) env.set("CONTENT_LENGTH", matcher[1]);
257	}
258	else if (name == "Content-Type")
259	{
260	if (value == matcher) env.set("CONTENT_TYPE", matcher[1]);
261	}
262	else if (name == "Host")
263	{
264	Matcher matcher("^\\s(.+?)(:[0-9]+)?\\s$");
265
266	if (value == matcher)
267	{
268	bool port(matcher.size() > 2);
269
270	env.set("HTTP_HOST", matcher[1] + (port ? matcher[2] : ""));
271	env.set("SERVER_NAME", matcher[1]);
272
273	if (port) env.set("SERVER_PORT", matcher[2].substr(1));
274	}
275	}
276	else if (name == "Referer")
277	{
278	if (value == matcher) env.set("HTTP_REFERER", matcher[1]);
279	}
280	else if (name == "User-Agent")
281	{
282	if (value == matcher) env.set("HTTP_USER_AGENT", matcher[1]);
283	}
284	}
285	while (sin.good());
286	}
287
288	Daemon::Status Daemon::message(istream& sin, Environment& env, ostream& post)
289	{
290	string contentLength(env.get("CONTENT_LENGTH"));
291
292	if (env.get("CONTENT_TYPE") != "application/x-www-form-urlencoded") return
293	mediaType;
294	if (contentLength.empty()) return lengthRequired;
295
296	streamsize length(lexical_cast<streamsize>(contentLength));
297	char* content(new char[length]);
298
299	sin.read(content, length);
300	post.write(content, length);
301
302	delete [] content;
303
304	return ok;
305	}