1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
#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>
void error(char *msg) {
perror(msg);
exit(0);
}
int main(int argc, char *argv[]) {
int sockfd, portno, n;
struct sockaddr_in6 serv_addr;
struct hostent *server;
char buffer[256] = "This is a string from client!";
if (argc < 3) {
fprintf(stderr, "Usage: %s \n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
printf("\nIPv6 TCP Client Started...\n");
//Sockets Layer Call: socket()
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
//Sockets Layer Call: gethostbyname2()
server = gethostbyname2(argv[1],AF_INET6);
if (server == NULL) {
fprintf(stderr, "ERROR, no such host\n");
exit(0);
}
memset((char *) &serv_addr, 0, sizeof(serv_addr));
serv_addr.sin6_flowinfo = 0;
serv_addr.sin6_family = AF_INET6;
memmove((char *) &serv_addr.sin6_addr.s6_addr, (char *) server->h_addr, server->h_length);
serv_addr.sin6_port = htons(portno);
//Sockets Layer Call: connect()
if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR connecting");
//Sockets Layer Call: send()
n = send(sockfd,buffer, strlen(buffer)+1, 0);
if (n < 0)
error("ERROR writing to socket");
memset(buffer, 0, 256);
//Sockets Layer Call: recv()
n = recv(sockfd, buffer, 255, 0);
if (n < 0)
error("ERROR reading from socket");
printf("Message from server: %s\n", buffer);
//Sockets Layer Call: close()
close(sockfd);
return 0;
}
|
