RecviveOutOfBandData.cpp

#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>
#include<errno.h>

#define BUF_SIZE 1024

int main(int argc,char*argv[])
{
    if (argc <= 2)
    {
        /* code */
        printf("usage:%s ip_address port_number\n",basename(argv[0]));
        return 1;
    }

    const char*ip = argv[1];
    int port =atoi(argv[2]);
    struct sockaddr_in address;
    bzero(&address,sizeof(address));
    address.sin_family = AF_INET;
    inet_pton(AF_INET,ip,&address.sin_addr);
    address.sin_port = htons(port);
    int sock = socket(PF_INET,SOCK_STREAM,0);
    assert(sock >=  0);

    int ret = bind(sock,(struct sockaddr*)&address,sizeof(address));
    assert(ret != -1);
    ret = listen(sock,5);
    assert(ret = -1);
    struct sockaddr_in client;
    socklen_t clinent_addrlength = sizeof(client);
    int connfd = accept(sock,(struct sockaddr*)&client,&clinent_addrlength);
    if (connfd < 0)
    {
        /* code */
        printf("errno is: %d\n",errno);
    }
    else
    {
        /* code */
        char buffer[BUF_SIZE];
        memset(buffer,'\0',BUF_SIZE);
        ret = recv(connfd,buffer,BUF_SIZE-1,0);
        printf("got %d bytes of normal data '%s'\n",ret,buffer);
        memset(buffer,'\0',BUF_SIZE);
        ret = recv(connfd,buffer,BUF_SIZE-1,MSG_OOB);
        printf("got %d bytes of oob data '%s'\n",ret,buffer);
        memset(buffer,'\0',BUF_SIZE);
        ret = recv(connfd,buffer,BUF_SIZE-1,0);
        printf("got %d bytes of normal data '%s'\n",ret,buffer);

        close(connfd);
    }
    close(sock);
    return 0;

}