Linux 原始套接字发送接收示例

客户端：发送

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <fcntl.h>

#include <sys/shm.h>

#define MYPORT 8887

#define BUFFER_SIZE 1024

int main()

{

///定义sockfd

int sock_cli = socket(AF_INET,SOCK_STREAM, 0);

///定义sockaddr_in

struct sockaddr_in servaddr;

memset(&servaddr, 0, sizeof(servaddr));

servaddr.sin_family = AF_INET;

servaddr.sin_port = htons(MYPORT); ///服务器端口

servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); ///服务器ip

///连接服务器，成功返回0，错误返回-1

if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)

{

perror("connect");

exit(1);

}

char sendbuf[BUFFER_SIZE]="abcde";

while (1)

{

send(sock_cli, sendbuf, strlen(sendbuf),0); ///发送

sleep(1);

memset(sendbuf, 0, sizeof(sendbuf));

}

close(sock_cli);

return 0;

}

服务端：接收

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <fcntl.h>

#include <sys/shm.h>

#define MYPORT 8887

#define QUEUE 20

#define BUFFER_SIZE 1024

int main()

{

///定义sockfd

int server_sockfd = socket(AF_INET,SOCK_STREAM, 0);

///定义sockaddr_in

struct sockaddr_in server_sockaddr;

server_sockaddr.sin_family = AF_INET;

server_sockaddr.sin_port = htons(MYPORT);

server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);

///bind，成功返回0，出错返回-1

if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-1)

{

perror("bind");

exit(1);

}

///listen，成功返回0，出错返回-1

if(listen(server_sockfd,QUEUE) == -1)

{

perror("listen");

exit(1);

}

///客户端套接字

char buffer[BUFFER_SIZE];

struct sockaddr_in client_addr;

socklen_t length = sizeof(client_addr);

///成功返回非负描述字，出错返回-1

int conn = accept(server_sockfd, (struct sockaddr*)&client_addr, &length);

if(conn<0)

{

perror("connect");

exit(1);

}

while(1)

{

memset(buffer,0,sizeof(buffer));

int len = recv(conn, buffer, sizeof(buffer),0);

printf("Recv dataLen = %d\n",len);

}

close(conn);

close(server_sockfd);

return 0;

}