lab3-2-client.c

linux下自建TCP连接服务器和客户端

#include <netdb.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
                                                                                
#define PORT 2345
#define SERVER_IP "127.0.0.1"
                                                                                
int main()
{
 int s, len;
 struct sockaddr_in addr;
 struct in_addr in;
 int addr_len = sizeof(struct sockaddr_in);
 char buffer[256];
 char *argv[80];
 
 
 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 {
  perror("socket");
  exit(1);
 }
 printf("Please type in the IP address of server:");
 fgets(argv[1], 80 ,stdin);
 while (1)
 {
  addr.sin_family = AF_INET;
  addr.sin_port = htons(PORT);
  inet_aton(argv[1],&in);
  addr.sin_addr.s_addr = in.s_addr;
  bzero(buffer, sizeof(buffer));
  printf("Please type in the message you want to send:\n");
  len = read(STDIN_FILENO, buffer, sizeof(buffer));
  sendto(s, buffer, len, 0, &addr, addr_len);
  len = recvfrom(s, buffer, sizeof(buffer), 0, &addr, &addr_len);
  printf("recieve : %s\n",buffer);
 }
}