lab3-2-server.c

linux下自建TCP连接服务器和客户端

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define PORT 2345

main()
{
 int sockfd, len;
 struct sockaddr_in addr;
 int addr_len = sizeof(struct sockaddr_in);
 char buffer[256];
 
 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 {
  perror("socket");
  exit(1);
 }
 
 bzero(&addr, sizeof(addr));
 addr.sin_family = AF_INET;
 addr.sin_port = htons(PORT);
 addr.sin_addr.s_addr = htonl(INADDR_ANY);

 if(bind(sockfd, &addr, sizeof(addr)) < 0)
 {
  perror("connect");
  exit(1);
 }
 while (1)
 {
  bzero(buffer, sizeof(buffer));
  len = recvfrom(sockfd, buffer, sizeof(buffer), 0, &addr, &addr_len);
  printf("Message: %s",buffer);
  printf("\nRecieved from : %s\n\n",inet_ntoa(addr.sin_addr));
  sendto(sockfd, buffer, len, 0, &addr, addr_len);
 }
}