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transfer.c
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transfer.c
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#include "transfer.h"
#include "config.h"
int init_socket(transfer_session *session, char *host_ip,\
unsigned short control_port, unsigned short data_port,
char *train_no)
{
session->connect = connect_server;
session->control_port = control_port;
session->data_port = data_port;
session->remote_addr = host_ip;
session->state = STATE_WAIT_CONN;
session->fd = 0;
session->train_no = train_no;
session->train_no_len = strlen(train_no);
session->f_desc = NULL;
}
int connect_server(transfer_session *session)
{
int client_fd, data_fd;
int len = 0;
struct sockaddr_in *remote_addr;
memset(&remote_addr, 0, sizeof(remote_addr));
remote_addr = &(session->remote_con_addr);
remote_addr->sin_family = AF_INET;
inet_pton(AF_INET, session->remote_addr, &(remote_addr->sin_addr.s_addr));
remote_addr->sin_port = HTONS(session->control_port);
if((client_fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket");
return -1;
}
if(connect(client_fd, (struct sockaddr *)remote_addr, sizeof(struct sockaddr)) < 0)
{
//perror("connect");
close(client_fd);
return -1;
}
session->fd = client_fd;
printf("connected to server\n");
remote_addr = &(session->remote_data_addr);
remote_addr->sin_family = AF_INET;
inet_pton(AF_INET, session->remote_addr, &(remote_addr->sin_addr.s_addr));
remote_addr->sin_port = HTONS(session->data_port);
if((data_fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("socket");
return -1;
}
session->data_fd = data_fd;
return client_fd;
}
int send_file_data(transfer_session *session, char *buf_send, int data_len)
{
int send_len;
socklen_t len;
len = sizeof(struct sockaddr);
send_len = sendto(session->data_fd, buf_send, data_len, 0,\
(struct sockaddr*)&(session->remote_data_addr), len);
//usleep(5000);
return send_len;
}
void receive_handler(void *args)
{
fd_set rset;
int sock_fd;
int recv_len = 0;
int frame_len;
int len;
int data_len;
unsigned short recv_crc;
unsigned char buf[2400];
unsigned char *handle_package;
q_msg package_msg;
transfer_session *session;
struct timeval timeout={1,0};
int i;
session = (transfer_session *)args;
sock_fd = session->fd;
FD_ZERO(&rset);
for(;;)
{
if(session->state == STATE_WAIT_CONN)
{
printf("exit receive handler\n");
return;
}
FD_SET(sock_fd, &rset);
select(sock_fd + 1, &rset, NULL, NULL, NULL);
if(FD_ISSET(sock_fd, &rset))
{
//printf("fd is set!");
len = recv(sock_fd, buf, LEN_HEADER, 0);
recv_len = 0;
recv_len = NTOHS(*((unsigned short *)buf));
if (recv_len > 2400 || recv_len <= 0)
{
t_log("receive package length error!length:%d\n", recv_len);
frame_len = recv(sock_fd, buf + LEN_HEADER, 2400, 0);
printf("frame len:%d\n", frame_len);
for(i = 0; i < frame_len; i++)
printf("%02x ", buf[i]);
printf("\n");
//loged too much
continue;
}
frame_len = recv(sock_fd, buf + LEN_HEADER, recv_len, MSG_WAITALL);
//printf("recv len:%d frame len:%d\n", recv_len, frame_len);
if (frame_len != recv_len)
continue;
frame_len += LEN_HEADER;
if (buf[recv_len + 1] != FRAME_TAIL)
continue;
data_len = recv_len + 1 - sizeof(frame_header);
recv_crc = get_crc_code(buf + sizeof(frame_header), data_len);
/*
if(recv_crc != NTOHS(((frame_header *)buf)->crc))
{
t_log("receive crc error");
continue;
}
*/
handle_package = (unsigned char *)t_malloc(frame_len);
//printf("malloc ptr:%p len:%d\n", handle_package, frame_len);
memcpy(handle_package, buf, frame_len);
memcpy(&package_msg.msg_buf.data, &handle_package,\
sizeof(handle_package));
package_msg.msg_type = MSG_TYPE_PACKAGE;
//printf("send to msg q\n");
if(send_to_msg_q(session->package_qid, &package_msg,\
sizeof(q_msg), 0) < 0)
{
perror("msg closed! quit the system!");
}
//printf("after send to msg q\n");
}
}
return;
}
void send_heartbeat_thread(void *args)
{
transfer_session *session;
int ret = 0;
session = (transfer_session *)args;
for(;;)
{
if(session->state < STATE_LOGIN || session->state >= STATE_TRANSFER_FIN)
return;
/* do not return in case of state be changed by others */
if((ret = send(session->fd, session->hb, HEARTBEAT_LEN, 0)) !=\
HEARTBEAT_LEN)
{
session->state = STATE_CONN_LOST;
t_log("[heart_beat]connection lost!");
return;
}
//else
// printf("send heart beat...\n");
sleep(1);
}
}