Browse Source Download (without any required ccan dependencies)
net
simple IPv4/IPv6 socket library
Rusty Russell <rusty@rustcorp.com.au>
This code makes it simple to support IPv4 and IPv6 without speed penalty in clients by using non-blocking simultaneous connect, and using a convenience function to create both IPv4 and IPv6 sockets for servers.
#include <ccan/net/net.h>
#include <netinet/in.h>
#include <stdio.h>
#include <err.h>
int main(int argc, char *argv[])
{
struct addrinfo *addr;
const char *dest, *port;
int fd;
union {
struct sockaddr s;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} u;
socklen_t slen = sizeof(u);
if (argc == 2) {
dest = argv[1];
port = "http";
} else if (argc == 3) {
dest = argv[1];
port = argv[2];
} else
errx(1, "Usage: test-net <target> [<port>]");
addr = net_client_lookup(dest, port, AF_UNSPEC, SOCK_STREAM);
if (!addr)
err(1, "Failed to look up %s", dest);
fd = net_connect(addr);
if (fd < 0)
err(1, "Failed to connect to %s", dest);
freeaddrinfo(addr);
if (getsockname(fd, &u.s, &slen) == 0)
printf("Connected via %s\n",
u.s.sa_family == AF_INET6 ? "IPv6"
: u.s.sa_family == AF_INET ? "IPv4"
: "UNKNOWN??");
else
err(1, "Failed to get socket type for connection");
return 0;
}
MIT