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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
void error(char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
int sockfd, newsockfd, portno;
socklen_t clilen;
char buffer[256];
struct sockaddr_in6 serv_addr, cli_addr;
int n;
char client_addr_ipv6[100];
if (argc < 2) {
fprintf(stderr, "Usage: %s \n", argv[0]);
exit(0);
}
printf("\nIPv6 TCP Server Started...\n");
//Sockets Layer Call: socket()
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin6_flowinfo = 0;
serv_addr.sin6_family = AF_INET6;
serv_addr.sin6_addr = in6addr_any;
serv_addr.sin6_port = htons(portno);
//Sockets Layer Call: bind()
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
//Sockets Layer Call: listen()
listen(sockfd, 5);
clilen = sizeof(cli_addr);
//Sockets Layer Call: accept()
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error("ERROR on accept");
//Sockets Layer Call: inet_ntop()
inet_ntop(AF_INET6, &(cli_addr.sin6_addr),client_addr_ipv6, 100);
printf("Incoming connection from client having IPv6 address: %s\n",client_addr_ipv6);
memset(buffer,0, 256);
//Sockets Layer Call: recv()
n = recv(newsockfd, buffer, 255, 0);
if (n < 0)
error("ERROR reading from socket");
printf("Message from client: %s\n", buffer);
//Sockets Layer Call: send()
printf("sending...\n");
n = send(newsockfd, "Server got your message", 23+1, 0);
if (n < 0)
error("ERROR writing to socket");
//Sockets Layer Call: close()
close(sockfd);
close(newsockfd);
return 0;
}
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