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/*
http-server.c - generic HTTP server
Copyright (C) 2008 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 */
int optval = 1;
setsockopt(server->s, SOL_SOCKET, SO_REUSEADDR, (const char *) &optval, sizeof(optval));
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);
}
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