基于数据包的原始套接字

服务器端代码：

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

#define N 64

typedef struct sockaddr SA;

int main(int argc, char *argv[])
{
 int sockfd;
 socklen_t addr_len;
 char buf[N];
 struct sockaddr_un myaddr, peeraddr;

 if (argc < 2)
 {
  printf("input format is : %s  <server_socket_file>\n", argv[0]);
  return -1;
 }

 if ((sockfd = socket(PF_UNIX, SOCK_DGRAM, 0)) == -1)
 {
  perror("sock fail");
  return -1;
 }

 unlink(argv[1]);
 bzero(&myaddr, sizeof(myaddr));
 myaddr.sun_family = PF_UNIX;
 strcpy(myaddr.sun_path, argv[1]);

 if (bind(sockfd, (SA *)&myaddr, sizeof(myaddr)) == -1)
 {
  perror("bind fail");
  return -1;
 }

 addr_len = sizeof(peeraddr);
 recvfrom(sockfd, buf, N, 0, (SA *)&peeraddr, &addr_len);
 printf("recv from %s : %s\n",peeraddr.sun_path, buf);
 sendto(sockfd, buf, N, 0, (SA *)&peeraddr, addr_len);

 return 0;
}

 

客户端代码如下：

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

#define N 64

typedef struct sockaddr SA;

int main(int argc, char *argv[])
{
 int sockfd;
 socklen_t addr_len;
 char buf[N];
 struct sockaddr_un peeraddr, myaddr;

 if (argc < 3)
 {
  printf("input format is : %s  <server_sock_file> <my_sock_file>\n", argv[0]);
  return -1;
 }

 if ((sockfd = socket(PF_UNIX, SOCK_DGRAM, 0)) == -1)
 {
  perror("sock fail");
  return -1;
 }

 // bind myaddr
 
 unlink(argv[2]);
 bzero(&myaddr, sizeof(myaddr));
 myaddr.sun_family = PF_UNIX;
 strcpy(myaddr.sun_path, argv[2]);
 if (bind(sockfd, (SA *)&myaddr, sizeof(myaddr)) == -1)
 {
  perror("bind fail");
  return -1;
 }

 bzero(&peeraddr, sizeof(peeraddr));
 peeraddr.sun_family = PF_UNIX;
 strcpy(peeraddr.sun_path, argv[1]);

 strcpy(buf, "this is unix dgram socket\n");
 addr_len = sizeof(peeraddr);
 sendto(sockfd, buf, N, 0, (SA *)&peeraddr, addr_len);
 recvfrom(sockfd, buf, N, 0, (SA *)&peeraddr, &addr_len);
 printf("recv from %s : %s\n", peeraddr.sun_path, buf);

 return 0;
}