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/*
* Copyright (C) 2000-2012 Free Software Foundation, Inc.
*
* This file is part of GnuTLS.
*
* GnuTLS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GnuTLS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#elif HAVE_WS2TCPIP_H
# include <ws2tcpip.h>
#endif
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef _WIN32
# include <signal.h>
#endif
#include <socket.h>
#include "sockets.h"
#define MAX_BUF 4096
extern unsigned int verbose;
/* Functions to manipulate sockets
*/
ssize_t
socket_recv (const socket_st * socket, void *buffer, int buffer_size)
{
int ret;
if (socket->secure)
{
do
{
ret = gnutls_record_recv (socket->session, buffer, buffer_size);
if (ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED)
gnutls_heartbeat_pong(socket->session, 0);
}
while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED);
}
else
do
{
ret = recv (socket->fd, buffer, buffer_size, 0);
}
while (ret == -1 && errno == EINTR);
return ret;
}
ssize_t
socket_send (const socket_st * socket, const void *buffer, int buffer_size)
{
return socket_send_range(socket, buffer, buffer_size, NULL);
}
ssize_t
socket_send_range (const socket_st * socket, const void *buffer, int buffer_size, gnutls_range_st *range)
{
int ret;
if (socket->secure)
do
{
if (range == NULL)
ret = gnutls_record_send (socket->session, buffer, buffer_size);
else
ret = gnutls_record_send_range(socket->session, buffer, buffer_size, range);
}
while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
else
do
{
ret = send (socket->fd, buffer, buffer_size, 0);
}
while (ret == -1 && errno == EINTR);
if (ret > 0 && ret != buffer_size && verbose)
fprintf (stderr,
"*** Only sent %d bytes instead of %d.\n", ret, buffer_size);
return ret;
}
void
socket_bye (socket_st * socket)
{
int ret;
if (socket->secure)
{
do
ret = gnutls_bye (socket->session, GNUTLS_SHUT_WR);
while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
if (ret < 0)
fprintf (stderr, "*** gnutls_bye() error: %s\n",
gnutls_strerror (ret));
gnutls_deinit (socket->session);
socket->session = NULL;
}
freeaddrinfo (socket->addr_info);
socket->addr_info = socket->ptr = NULL;
free (socket->ip);
free (socket->hostname);
free (socket->service);
shutdown (socket->fd, SHUT_RDWR); /* no more receptions */
close (socket->fd);
socket->fd = -1;
socket->secure = 0;
}
void
socket_open (socket_st * hd, const char *hostname, const char *service, int udp)
{
struct addrinfo hints, *res, *ptr;
int sd, err;
char buffer[MAX_BUF + 1];
char portname[16] = { 0 };
printf ("Resolving '%s'...\n", hostname);
/* get server name */
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
if ((err = getaddrinfo (hostname, service, &hints, &res)))
{
fprintf (stderr, "Cannot resolve %s:%s: %s\n", hostname, service,
gai_strerror (err));
exit (1);
}
sd = -1;
for (ptr = res; ptr != NULL; ptr = ptr->ai_next)
{
sd = socket (ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
if (sd == -1)
continue;
if ((err = getnameinfo (ptr->ai_addr, ptr->ai_addrlen, buffer, MAX_BUF,
portname, sizeof (portname),
NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
{
fprintf (stderr, "getnameinfo(): %s\n", gai_strerror (err));
continue;
}
if (hints.ai_socktype == SOCK_DGRAM)
{
#if defined(IP_DONTFRAG)
int yes = 1;
if (setsockopt (sd, IPPROTO_IP, IP_DONTFRAG,
(const void *) &yes, sizeof (yes)) < 0)
perror ("setsockopt(IP_DF) failed");
#elif defined(IP_MTU_DISCOVER)
int yes = IP_PMTUDISC_DO;
if (setsockopt(sd, IPPROTO_IP, IP_MTU_DISCOVER,
(const void*) &yes, sizeof (yes)) < 0)
perror ("setsockopt(IP_DF) failed");
#endif
}
printf ("Connecting to '%s:%s'...\n", buffer, portname);
err = connect (sd, ptr->ai_addr, ptr->ai_addrlen);
if (err < 0)
{
fprintf (stderr, "Cannot connect to %s:%s: %s\n", buffer,
portname, strerror (errno));
continue;
}
break;
}
if (err != 0)
exit(1);
if (sd == -1)
{
fprintf (stderr, "Could not find a supported socket\n");
exit (1);
}
hd->secure = 0;
hd->fd = sd;
hd->hostname = strdup (hostname);
hd->ip = strdup (buffer);
hd->service = strdup (portname);
hd->ptr = ptr;
hd->addr_info = res;
return;
}
void
sockets_init (void)
{
#ifdef _WIN32
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD (1, 1);
if (WSAStartup (wVersionRequested, &wsaData) != 0)
{
perror ("WSA_STARTUP_ERROR");
}
#else
signal (SIGPIPE, SIG_IGN);
#endif
}
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