* Copyright 2008, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT license.
*/
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
extern const char* __progname;
int
main(int argc, char** argv)
{
if (argc < 2) {
printf("usage: %s <host> [port]\n"
"Connects to the host (default port 21, ftp), and calls\n"
"getpeername() to see if it works correctly with a short\n"
"buffer.\n", __progname);
return 0;
}
struct hostent* host = gethostbyname(argv[1]);
if (host == NULL) {
perror("gethostbyname");
return 1;
}
uint16_t port = 21;
if (argc > 2)
port = atol(argv[2]);
int socket = ::socket(AF_INET, SOCK_STREAM, 0);
if (socket < 0) {
perror("socket");
return 1;
}
sockaddr_in address;
memset(&address, 0, sizeof(sockaddr_in));
address.sin_family = AF_INET;
address.sin_port = htons(port);
address.sin_addr = *((struct in_addr*)host->h_addr);
socklen_t length = 14;
sockaddr buffer;
int result = getpeername(socket, &buffer, &length);
printf("getpeername() before connect(): %d (%s), length: %d\n", result,
strerror(errno), length);
if (connect(socket, (sockaddr*)&address, sizeof(sockaddr_in)) < 0) {
perror("connect");
return 1;
}
errno = 0;
length = 14;
result = getpeername(socket, &buffer, &length);
printf("getpeername() after connect(): %d (%s), length: %d\n", result,
strerror(errno), length);
close(socket);
return 0;
}
