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/* tcpserver.c
*
* TCP Server
* note: 'echo "hello" | nc localhost 8080' to send messages to the server
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
int main(int argc, char **argv)
{
if (argc != 2)
{
fprintf(stderr, "usage: %s <port>\n", argv[0]);
exit(1);
}
int server_sockfd, ret;
if ((server_sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket");
close(server_sockfd);
exit(-1);
}
/* allow fast reuse of ports */
int reuse_true = 1;
setsockopt(server_sockfd, SOL_SOCKET, SO_REUSEADDR, &reuse_true,
sizeof(reuse_true));
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(atoi(argv[1]));
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(server_sockfd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
{
perror("bind");
exit(-1);
}
if (listen(server_sockfd, 0) == -1)
{
perror("listen");
exit(-1);
}
struct sockaddr_in remote_addr;
unsigned int socklen = sizeof(remote_addr);
while (1)
{
int sockfd;
sockfd = accept(server_sockfd, (struct sockaddr *) &remote_addr, &socklen);
if (sockfd == -1)
{
perror("socket");
close(sockfd);
exit(-1);
}
char buf[255] = { 0 };
if ((ret = recv(sockfd, buf, sizeof(buf), 0)) < 0)
{
perror("recv");
exit(-1);
}
printf("%s", buf);
shutdown(sockfd, SHUT_RDWR);
close(sockfd);
}
shutdown(server_sockfd, SHUT_RDWR);
close(server_sockfd);
}
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