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

#define BUF_SIZE 1024

int main(int argc, const char *argv[])
{
    
    if (argc <= 2) 
    {
        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 client_addrlength = sizeof(client);
    int connfd = accept(sock, (struct sockaddr *)&client, &client_addrlength);
    if (connfd < 0) 
    {
        printf("errno is: %d, errstr: %s\n", errno, strerror(errno));
    }
    else
    {
        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;
}