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http_engine.c
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/*
* http_mod.c - RFC 2616 module documentation.
*/
#include <linux/kernel.h> /* Needed for KERN_INFO */
/* kthread management*/
#include <linux/kthread.h>
/* socket management*/
#include <net/sock.h>
#include "http_parser.h"
#define http_debug printk // TODO
static struct task_struct * server_task; // TODO multiple server
int tcp_receive_data(struct socket * sk,char * buffer,int length)
{
struct msghdr msg;
struct iovec iov;
int ret;
iov.iov_base = (void *)buffer;
iov.iov_len = (__kernel_size_t)length;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = MSG_DONTWAIT;
ret = sock_recvmsg(sk, &msg, length, 0);
buffer[ret] = 0;
printk(buffer);
return ret;
}
int tcp_send_data(struct socket * sk,char * buffer,int length)
{
struct msghdr msg;
struct iovec iov;
int len;
iov.iov_base = (void *)buffer;
iov.iov_len = (__kernel_size_t)length;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
len = sock_sendmsg(sk, &msg, length);
return len;
}
const char * html_header = "HTTP/1.1 200 OK\n\
Content-Type: text/html; charset=utf-8\n\
Connection: close\n\
Content-Length: ";
const char * html_content = "<html><body><h1>It works!</h1>\
<p>This is the default web page for this server.</p>\
<p>The web server software is running but no content has been added, yet.</p>\
</body></html>\n";
int http_build_reply(char * out_buffer,char * in_buffer,int max_length)
{
int len;
int msg_len = strlen(html_content);
len = sprintf(out_buffer,"%s%d\n\n%s",html_header,msg_len,html_content);
printk("Compute html content %d octets total size = %d \n",(int)strlen(html_content),len);
return len;
}
static void (*sk_old_data_ready)(struct sock *sk, int bytes) = NULL;
/* data available on socket, or listen socket received a connect */
static void ceph_sock_data_ready(struct sock *sk, int count_unused)
{
char recv_buffer[512];
int length = 512;
int ret = 0;
struct socket * sk_socket = sk->sk_socket;
/*TODO : Use this method to handle multiple connections*/
printk("sock_data_ready %d \n",count_unused);
sk_old_data_ready(sk,count_unused);
// ret = tcp_receive_data(sk_socket,recv_buffer,length);
// http_debug("tcp_receive_data = %d\n", ret);
/* struct ceph_connection *con = sk->sk_user_data;
if (atomic_read(&con->msgr->stopping)) {
return;
}
if (sk->sk_state != TCP_CLOSE_WAIT) {
dout("%s on %p state = %lu, queueing work\n", __func__,
con, con->state);
queue_con(con);
}
*/
}
static void set_sock_callbacks(struct socket *sock)
{
struct sock *sk = sock->sk;
// sk->sk_user_data = con;
sk_old_data_ready = sk->sk_data_ready;
sk->sk_data_ready = ceph_sock_data_ready;
//sk->sk_write_space = ceph_sock_write_space;
//sk->sk_state_change = ceph_sock_state_change;
}
static int tcp_server_thread(void *data)
{
char recv_buffer[512];
char send_buffer[512];
int length = 512;
struct socket *sk = NULL;
struct socket *new_sk = NULL;
http_parser * cur_parser = NULL;
struct sockaddr_in svr_addr;
struct sockaddr_in client_addr;
int ret = 0;
memset(&svr_addr, 0, sizeof(svr_addr));
svr_addr.sin_family = AF_INET;
svr_addr.sin_addr.s_addr = htonl(INADDR_ANY);
svr_addr.sin_port = htons(9090);
allow_signal(SIGTERM);
http_debug(KERN_INFO "HTTP listen thread start\n");
ret = sock_create(AF_INET, SOCK_STREAM,IPPROTO_TCP, &sk);
if (ret < 0)
{
http_debug("sock_create failed %d\n",ret);
return ret;
}
ret = sk->ops->bind(sk, (struct sockaddr *)&svr_addr,sizeof(svr_addr));
http_debug("bind ret = %d\n", ret);
ret = sk->ops->listen(sk, SOMAXCONN);
http_debug("bind listen = %d\n", ret);
while (1)
{
set_current_state(TASK_INTERRUPTIBLE);
if (!kthread_should_stop())
{
http_debug("wait socket to accept \n");
ret = kernel_accept(sk, &new_sk,0);
if (ret >= 0)
{
http_debug("connection received %d\n", ret);
// TODO : IPV6
ret = kernel_getpeername(new_sk,(struct sockaddr *)&client_addr,&length);
printk("client sock %d : %X:%d\n",length,client_addr.sin_addr.s_addr,htons(client_addr.sin_port));
set_current_state(TASK_RUNNING);
set_sock_callbacks(new_sk); // TODO : handle read / right
cur_parser = http_parser_get();
http_parser_recvdata(cur_parser,recv_buffer,length);
ret = tcp_receive_data(new_sk,recv_buffer,length);
http_debug("tcp_receive_data = %d\n", ret);
ret = http_build_reply(send_buffer,recv_buffer,length);
ret = tcp_send_data(new_sk,send_buffer,ret);
http_debug("tcp_send_data = %d\n", ret);
msleep(15000);
kernel_sock_shutdown(new_sk,SHUT_RDWR);
ret = new_sk->ops->release(new_sk);
sock_release(new_sk);
http_debug("release = %d\n", ret);
}
else
{
http_debug("no connection received %d\n", ret);
break;
}
}
else
{
break;
}
}
if (sk)
ret = sk->ops->release(sk);
sock_release(sk);
http_debug("release binded socket = %d\n", ret);
return ret;
}
/* TODO : add parameter (if / port / ...)*/
int http_engine_start(void)
{
http_debug(KERN_INFO "HTTP module start \n");
/* creating a thread for connection management */
server_task = kthread_run(tcp_server_thread, NULL, "server task");
if (IS_ERR(server_task))
{
printk(KERN_ERR "can't start http daemon\n");
return PTR_ERR(server_task);
}
return 0;
}
int http_engine_stop(void)
{
http_debug(KERN_INFO "HTTP module stop \n");
send_sig(SIGTERM, server_task, 1);
kthread_stop(server_task);
return 0;
}