jscoverage/trunk/http-server.c

/*
    http-server.c - generic HTTP server
    Copyright (C) 2008, 2009, 2010 siliconforks.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <config.h>

#include "http-server.h"

#include <stdarg.h>
#include <string.h>

#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif

#ifdef __MINGW32__
#include <process.h>
#endif

#include "util.h"

#ifdef __MINGW32__
typedef void ThreadRoutineReturnType;
#define THREAD_ROUTINE_RETURN return
#else
typedef void * ThreadRoutineReturnType;
#define THREAD_ROUTINE_RETURN return NULL
#endif

struct HTTPServer {
  char * ip_address;
  uint16_t port;
  HTTPServerHandler handler;
  SOCKET s;
};

struct HTTPServerConnection {
  HTTPConnection * connection;
  struct HTTPServer * server;
};

static bool is_shutdown = false;
#ifdef __MINGW32__
CRITICAL_SECTION shutdown_mutex;
#define LOCK EnterCriticalSection
#define UNLOCK LeaveCriticalSection
#else
pthread_mutex_t shutdown_mutex = PTHREAD_MUTEX_INITIALIZER;
#define LOCK pthread_mutex_lock
#define UNLOCK pthread_mutex_unlock
#endif

static ThreadRoutineReturnType handle_connection(void * p) {
  struct HTTPServerConnection * connection = p;
  uint16_t port = connection->server->port;

  HTTPExchange * exchange = HTTPExchange_new(connection->connection);
  if (HTTPExchange_read_request_headers(exchange) == 0) {
    connection->server->handler(exchange);
  }
  else {
    HTTPExchange_set_status_code(exchange, 400);
    const char * message = "Could not parse request headers\n";
    if (HTTPExchange_write_response(exchange, message, strlen(message)) != 0) {
      HTTPServer_log_err("Warning: error writing to client\n");
    }
  }
  if (HTTPExchange_flush_response(exchange) != 0) {
    HTTPServer_log_err("Warning: error writing to client\n");
  }
  HTTPExchange_delete(exchange);
  if (HTTPConnection_delete(connection->connection) != 0) {
    HTTPServer_log_err("Warning: error closing connection to client\n");
  }
  free(connection);

  /* HACK: make connection to server to force accept() to return */
  LOCK(&shutdown_mutex);
  if (is_shutdown) {
    SOCKET s = socket(PF_INET, SOCK_STREAM, 0);
    if (s == INVALID_SOCKET) {
      HTTPServer_log_err("Warning: error creating socket\n");
    }
    else {
      struct sockaddr_in a;
      a.sin_family = AF_INET;
      a.sin_port = htons(port);
      a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
      if (connect(s, (struct sockaddr *) &a, sizeof(a)) == -1) {
        HTTPServer_log_err("Warning: error connecting to server\n");
      }
      closesocket(s);
    }
  }
  UNLOCK(&shutdown_mutex);

  THREAD_ROUTINE_RETURN;
}

static struct HTTPServer * HTTPServer_new(const char * ip_address, uint16_t port, HTTPServerHandler handler) {
  struct HTTPServer * result = xmalloc(sizeof(struct HTTPServer));
  if (ip_address == NULL) {
    result->ip_address = NULL;
  }
  else {
    result->ip_address = xstrdup(ip_address);
  }
  result->port = port;
  result->handler = handler;
  result->s = -1;
  return result;
}

static void HTTPServer_delete(struct HTTPServer * server) {
  free(server->ip_address);
  closesocket(server->s);
  free(server);
}

void HTTPServer_run(const char * ip_address, uint16_t port, HTTPServerHandler handler) {
  struct HTTPServer * server = HTTPServer_new(ip_address, port, handler);

#ifdef __MINGW32__
  WSADATA data;
  if (WSAStartup(MAKEWORD(1, 1), &data) != 0) {
    fatal("could not start Winsock");
  }
  InitializeCriticalSection(&shutdown_mutex);
#endif

  server->s = socket(PF_INET, SOCK_STREAM, 0);
  if (server->s == INVALID_SOCKET) {
    fatal("could not create socket");
  }

  /* http://hea-www.harvard.edu/~fine/Tech/addrinuse.html */
  /* note that SO_REUSEADDR has different semantics on Windows */
#ifndef __MINGW32__
  int optval = 1;
  setsockopt(server->s, SOL_SOCKET, SO_REUSEADDR, (const char *) &optval, sizeof(optval));
#endif

  struct sockaddr_in a;
  a.sin_family = AF_INET;
  a.sin_port = htons(server->port);
  if (server->ip_address == NULL) {
    /*
    a.sin_addr.s_addr = htonl(INADDR_ANY);
    */
    a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  }
  else {
    if (inet_aton(server->ip_address, &(a.sin_addr)) == 0) {
      closesocket(server->s);
      fatal("invalid address: %s", server->ip_address);
    }
  }

  if (bind(server->s, (struct sockaddr *) &a, sizeof(a)) == -1) {
    closesocket(server->s);
    fatal("could not bind to address");
  }

  if (listen(server->s, 5) == -1) {
    closesocket(server->s);
    fatal("could not listen for connections");
  }

  for (;;) {
    struct sockaddr_in client_address;
    size_t client_address_size = sizeof(client_address);
    SOCKET s = accept(server->s, (struct sockaddr *) &client_address, &client_address_size);
    if (s == INVALID_SOCKET) {
      HTTPServer_log_err("Warning: could not accept client connection\n");
      continue;
    }

    LOCK(&shutdown_mutex);
    if (is_shutdown) {
      closesocket(s);
      break;
    }
    UNLOCK(&shutdown_mutex);

    struct HTTPServerConnection * connection = xmalloc(sizeof(struct HTTPServerConnection));
    connection->server = server;
    connection->connection = HTTPConnection_new_server(s);

#ifdef __MINGW32__
    unsigned long thread = _beginthread(handle_connection, 0, connection);
#else
    pthread_t thread;
    pthread_attr_t a;
    pthread_attr_init(&a);
    pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
    pthread_create(&thread, &a, handle_connection, connection);
    pthread_attr_destroy(&a);
#endif
  }

  HTTPServer_delete(server);
}

void HTTPServer_shutdown(void) {
  LOCK(&shutdown_mutex);
  is_shutdown = true;
  UNLOCK(&shutdown_mutex);
}

void HTTPServer_log_out(const char * format, ...) {
  va_list a;
  va_start(a, format);
  vfprintf(stdout, format, a);
  va_end(a);
  fflush(stdout);
}

void HTTPServer_log_err(const char * format, ...) {
  va_list a;
  va_start(a, format);
  vfprintf(stderr, format, a);
  va_end(a);
  fflush(stderr);
}
1	/*
2	http-server.c - generic HTTP server
3	Copyright (C) 2008, 2009, 2010 siliconforks.com
4
5	This program is free software; you can redistribute it and/or modify
6	it under the terms of the GNU General Public License as published by
7	the Free Software Foundation; either version 2 of the License, or
8	(at your option) any later version.
9
10	This program is distributed in the hope that it will be useful,
11	but WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License along
16	with this program; if not, write to the Free Software Foundation, Inc.,
17	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18	*/
19
20	#include <config.h>
21
22	#include "http-server.h"
23
24	#include <stdarg.h>
25	#include <string.h>
26
27	#ifdef HAVE_PTHREAD_H
28	#include <pthread.h>
29	#endif
30
31	#ifdef __MINGW32__
32	#include <process.h>
33	#endif
34
35	#include "util.h"
36
37	#ifdef __MINGW32__
38	typedef void ThreadRoutineReturnType;
39	#define THREAD_ROUTINE_RETURN return
40	#else
41	typedef void * ThreadRoutineReturnType;
42	#define THREAD_ROUTINE_RETURN return NULL
43	#endif
44
45	struct HTTPServer {
46	char * ip_address;
47	uint16_t port;
48	HTTPServerHandler handler;
49	SOCKET s;
50	};
51
52	struct HTTPServerConnection {
53	HTTPConnection * connection;
54	struct HTTPServer * server;
55	};
56
57	static bool is_shutdown = false;
58	#ifdef __MINGW32__
59	CRITICAL_SECTION shutdown_mutex;
60	#define LOCK EnterCriticalSection
61	#define UNLOCK LeaveCriticalSection
62	#else
63	pthread_mutex_t shutdown_mutex = PTHREAD_MUTEX_INITIALIZER;
64	#define LOCK pthread_mutex_lock
65	#define UNLOCK pthread_mutex_unlock
66	#endif
67
68	static ThreadRoutineReturnType handle_connection(void * p) {
69	struct HTTPServerConnection * connection = p;
70	uint16_t port = connection->server->port;
71
72	HTTPExchange * exchange = HTTPExchange_new(connection->connection);
73	if (HTTPExchange_read_request_headers(exchange) == 0) {
74	connection->server->handler(exchange);
75	}
76	else {
77	HTTPExchange_set_status_code(exchange, 400);
78	const char * message = "Could not parse request headers\n";
79	if (HTTPExchange_write_response(exchange, message, strlen(message)) != 0) {
80	HTTPServer_log_err("Warning: error writing to client\n");
81	}
82	}
83	if (HTTPExchange_flush_response(exchange) != 0) {
84	HTTPServer_log_err("Warning: error writing to client\n");
85	}
86	HTTPExchange_delete(exchange);
87	if (HTTPConnection_delete(connection->connection) != 0) {
88	HTTPServer_log_err("Warning: error closing connection to client\n");
89	}
90	free(connection);
91
92	/* HACK: make connection to server to force accept() to return */
93	LOCK(&shutdown_mutex);
94	if (is_shutdown) {
95	SOCKET s = socket(PF_INET, SOCK_STREAM, 0);
96	if (s == INVALID_SOCKET) {
97	HTTPServer_log_err("Warning: error creating socket\n");
98	}
99	else {
100	struct sockaddr_in a;
101	a.sin_family = AF_INET;
102	a.sin_port = htons(port);
103	a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
104	if (connect(s, (struct sockaddr *) &a, sizeof(a)) == -1) {
105	HTTPServer_log_err("Warning: error connecting to server\n");
106	}
107	closesocket(s);
108	}
109	}
110	UNLOCK(&shutdown_mutex);
111
112	THREAD_ROUTINE_RETURN;
113	}
114
115	static struct HTTPServer * HTTPServer_new(const char * ip_address, uint16_t port, HTTPServerHandler handler) {
116	struct HTTPServer * result = xmalloc(sizeof(struct HTTPServer));
117	if (ip_address == NULL) {
118	result->ip_address = NULL;
119	}
120	else {
121	result->ip_address = xstrdup(ip_address);
122	}
123	result->port = port;
124	result->handler = handler;
125	result->s = -1;
126	return result;
127	}
128
129	static void HTTPServer_delete(struct HTTPServer * server) {
130	free(server->ip_address);
131	closesocket(server->s);
132	free(server);
133	}
134
135	void HTTPServer_run(const char * ip_address, uint16_t port, HTTPServerHandler handler) {
136	struct HTTPServer * server = HTTPServer_new(ip_address, port, handler);
137
138	#ifdef __MINGW32__
139	WSADATA data;
140	if (WSAStartup(MAKEWORD(1, 1), &data) != 0) {
141	fatal("could not start Winsock");
142	}
143	InitializeCriticalSection(&shutdown_mutex);
144	#endif
145
146	server->s = socket(PF_INET, SOCK_STREAM, 0);
147	if (server->s == INVALID_SOCKET) {
148	fatal("could not create socket");
149	}
150
151	/* http://hea-www.harvard.edu/~fine/Tech/addrinuse.html */
152	/* note that SO_REUSEADDR has different semantics on Windows */
153	#ifndef __MINGW32__
154	int optval = 1;
155	setsockopt(server->s, SOL_SOCKET, SO_REUSEADDR, (const char *) &optval, sizeof(optval));
156	#endif
157
158	struct sockaddr_in a;
159	a.sin_family = AF_INET;
160	a.sin_port = htons(server->port);
161	if (server->ip_address == NULL) {
162	/*
163	a.sin_addr.s_addr = htonl(INADDR_ANY);
164	*/
165	a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
166	}
167	else {
168	if (inet_aton(server->ip_address, &(a.sin_addr)) == 0) {
169	closesocket(server->s);
170	fatal("invalid address: %s", server->ip_address);
171	}
172	}
173
174	if (bind(server->s, (struct sockaddr *) &a, sizeof(a)) == -1) {
175	closesocket(server->s);
176	fatal("could not bind to address");
177	}
178
179	if (listen(server->s, 5) == -1) {
180	closesocket(server->s);
181	fatal("could not listen for connections");
182	}
183
184	for (;;) {
185	struct sockaddr_in client_address;
186	size_t client_address_size = sizeof(client_address);
187	SOCKET s = accept(server->s, (struct sockaddr *) &client_address, &client_address_size);
188	if (s == INVALID_SOCKET) {
189	HTTPServer_log_err("Warning: could not accept client connection\n");
190	continue;
191	}
192
193	LOCK(&shutdown_mutex);
194	if (is_shutdown) {
195	closesocket(s);
196	break;
197	}
198	UNLOCK(&shutdown_mutex);
199
200	struct HTTPServerConnection * connection = xmalloc(sizeof(struct HTTPServerConnection));
201	connection->server = server;
202	connection->connection = HTTPConnection_new_server(s);
203
204	#ifdef __MINGW32__
205	unsigned long thread = _beginthread(handle_connection, 0, connection);
206	#else
207	pthread_t thread;
208	pthread_attr_t a;
209	pthread_attr_init(&a);
210	pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
211	pthread_create(&thread, &a, handle_connection, connection);
212	pthread_attr_destroy(&a);
213	#endif
214	}
215
216	HTTPServer_delete(server);
217	}
218
219	void HTTPServer_shutdown(void) {
220	LOCK(&shutdown_mutex);
221	is_shutdown = true;
222	UNLOCK(&shutdown_mutex);
223	}
224
225	void HTTPServer_log_out(const char * format, ...) {
226	va_list a;
227	va_start(a, format);
228	vfprintf(stdout, format, a);
229	va_end(a);
230	fflush(stdout);
231	}
232
233	void HTTPServer_log_err(const char * format, ...) {
234	va_list a;
235	va_start(a, format);
236	vfprintf(stderr, format, a);
237	va_end(a);
238	fflush(stderr);
239	}