//send packet with ACK no
//int corr is for printEv purposes only.
//corr: 1= dupl, 2= not dupl
void sendACK(int last_cons_seq,struct sockaddr_in * cli_addr, int sockfd,char*dip,char*dpt,int corr){
char * pack = makePack(last_cons_seq,1);
socklen_t cli_len = sizeof(*cli_addr);
int charsent;
if ((charsent = sendto(sockfd, pack, strlen(pack), 0,(struct sockaddr *)&*cli_addr, cli_len) == -1)) {
perror("sws: error in sendto()");
exit(1);
}
if(corr==2){
printEvent(1,2,pack,"ACK",dip,dpt);
}
if(corr==1){
printEvent(1,1,pack,"ACK",dip,dpt);
}
free(pack);
}
//establishes by waiting for SYN packet from sender. Returns SENDER seq #
//verified
int estConn( struct sockaddr_in *cli_addr,int sockfd,struct Info *c,char * dip, char * dpt){
//printf("Waiting for sender....\n");
char buffer[MAXBUFLEN];
socklen_t cli_len = sizeof(*cli_addr);
int verify = recvfrom(sockfd, buffer, MAXBUFLEN-1 , 0,(struct sockaddr *)&*cli_addr, &cli_len);
if(verify==-1){
printf("error on recvfrom()\nExit..\n");
exit(1);
}
buffer[verify] = '\0';
int type = isA(buffer);
if(type == 1){ //got syn
printEvent(2,2,buffer,"SYN",dip,dpt);
c->syn_rcv+=1;
c->total_bytes_rcv+=strlen(buffer);
c->unique_bytes_rcv+=strlen(buffer);
c->total_packets_rcv+=1;
c->unique_packets_rcv+=1;
}
else{
return -1;
}
int s_seq = getSeqNo(buffer,1) + strlen(buffer);
char * tosend = makePack(s_seq,1);
//printf("tosend:\n%s\n",tosend);
int charsent;
if ((charsent = sendto(sockfd, tosend, strlen(tosend), 0,(struct sockaddr *)&*cli_addr, cli_len) == -1)) {
perror("sws: error in sendto()");
exit(1);
}
printEvent(1,2,tosend,"ACK",dip,dpt);
c->ack_sent+=1;
free(tosend);
return s_seq;
}
/* 主程序 */
int main(int argc,char *argv[])
{
int src_fd,dst_fd;
int retval = RET_FAIL;
struct sockaddr_in src_addr,dst_addr;
int addr_sz = sizeof(struct sockaddr);
/* 1.初始化udp */
printf("######### Client socket initial #########\n");
src_fd = socket(AF_INET,SOCK_DGRAM,0);
if(src_fd < 0)
{
CLI_PRINT("Client socket create fail..\n");
return RET_FAIL;
}
CLI_PRINT("Client udp sock create success.\n");
/* 2.绑定 */
printf("######### socket bind #########\n");
src_addr.sin_family = AF_INET;
src_addr.sin_addr.s_addr = htonl(INADDR_ANY);
src_addr.sin_port = htons(SRC_PORT);
retval = bind(src_fd,(struct sockaddr *)&src_addr,addr_sz);
if(retval < 0)
{
CLI_PRINT("Client bind fail.\n");
return RET_FAIL;
}
CLI_PRINT("Client sock bind success.\n");
/* 3.组包 */
printf("######### making package #########\n");
//EN_MSG_TYPE type = TYPE_MSG_HEAD;// 消息类型
PST_FILE_HEADER head = (PST_FILE_HEADER)malloc(sizeof(ST_FILE_HEADER));
if(head == NULL)
{
CLI_PRINT("Malloc error.\n");
close(src_fd);
return RET_FAIL;
}
memset(head,0,sizeof(ST_FILE_HEADER));
CLI_PRINT("Malloc done.\n");
//memcpy(head->name,"pisc_v1.0",strlen("pisc_v1.0"));
strncpy(head->name,"pisc_v1.0",strlen("pisc_v1.0"));
head->type = TYPE_PISC; // 文件类型,区别于消息类型
head->size = 1024; // 乱填的数据
head->version = 1; // 乱填的数据
head->crc = 555; // 乱填的数据
CLI_PRINT("memcpy done.\n");
PST_MSG message = makePack(TYPE_MSG_HEAD,&head);
CLI_PRINT("Make package done..\n");
/* 4.发送测试数据 */
printf("######### Ready to send data #########\n");
dst_addr.sin_family = AF_INET;
//dst_addr.sin_addr.s_addr = inet_addr("192.168.16.67");
dst_addr.sin_addr.s_addr = inet_addr("192.168.16.181");
dst_addr.sin_port = htons(UDP_PORT);
while(1)
{
retval = sendto(src_fd,message,sizeof(ST_MSG),0,(struct sockaddr *)&dst_addr,addr_sz);
if(retval < 0)
{
CLI_PRINT("Send data error.\n");
}
CLI_PRINT("Client send %d bytes data.\n",retval);
sleep(2);
}
free(head);
free(msg);
return RET_OK;
}
