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/*
* Copyright (c) 2002-2019 Balabit
* Copyright (c) 1998-2019 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "transport-udp-socket.h"
#include "transport/transport-socket.h"
#include "gsocket.h"
#include "scratch-buffers.h"
#include "str-format.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <errno.h>
#include <string.h>
typedef struct _LogTransportUDP LogTransportUDP;
struct _LogTransportUDP
{
LogTransportSocket super;
GSockAddr *bind_addr;
};
#if defined(__FreeBSD__) || defined(__OpenBSD__)
GSockAddr *
_extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
{
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_RECVDSTADDR)
{
struct sockaddr_in sin = *(struct sockaddr_in *) &bind_addr->sa;
struct in_addr *sin_addr = (struct in_addr *) CMSG_DATA(cmsg);
sin.sin_addr = *sin_addr;
return g_sockaddr_new((struct sockaddr *) &sin, sizeof(sin));
}
return NULL;
}
#else
GSockAddr *
_extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
{
#ifdef IP_PKTINFO
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO)
{
struct sockaddr_in sin;
struct in_pktinfo inpkt;
memcpy(&inpkt, CMSG_DATA(cmsg), sizeof(inpkt));
/* we need to copy the port number from the bind address as it is not
* part of IP_PKTINFO */
sin = *(struct sockaddr_in *) &bind_addr->sa;
sin.sin_addr = inpkt.ipi_addr;
return g_sockaddr_new((struct sockaddr *) &sin, sizeof(sin));
}
#endif
return NULL;
}
#endif
#if SYSLOG_NG_ENABLE_IPV6
GSockAddr *
_extract_dest_ip6_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
{
#ifdef IPV6_PKTINFO
if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO)
{
struct sockaddr_in6 sin6;
struct in6_pktinfo in6pkt;
memcpy(&in6pkt, CMSG_DATA(cmsg), sizeof(in6pkt));
/* we need to copy the port number (and scope id) from the bind
* address as it is not part of IPV6_PKTINFO */
sin6 = *(struct sockaddr_in6 *) &bind_addr->sa;
sin6.sin6_addr = in6pkt.ipi6_addr;
return g_sockaddr_new((struct sockaddr *) &sin6, sizeof(sin6));
}
#endif
return NULL;
}
#endif
GSockAddr *
_extract_dest_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
{
if (bind_addr->sa.sa_family == AF_INET)
return _extract_dest_ip4_addr_from_cmsg(cmsg, bind_addr);
#if SYSLOG_NG_ENABLE_IPV6
else if (bind_addr->sa.sa_family == AF_INET6)
return _extract_dest_ip6_addr_from_cmsg(cmsg, bind_addr);
#endif
else
g_assert_not_reached();
}
static void
log_transport_udp_parse_cmsg(LogTransportSocket *s, struct cmsghdr *cmsg, LogTransportAuxData *aux)
{
LogTransportUDP *self = (LogTransportUDP *) s;
log_transport_socket_parse_cmsg_method(s, cmsg, aux);
GSockAddr *dest_addr = _extract_dest_addr_from_cmsg(cmsg, self->bind_addr);
if (dest_addr)
{
log_transport_aux_data_set_local_addr_ref(aux, dest_addr);
return;
}
}
static void
_setup_fd(LogTransportUDP *self, gint fd)
{
gint on = 1;
self->bind_addr = g_socket_get_local_name(fd);
if (self->super.address_family == AF_INET)
{
#if defined(__FreeBSD__) || defined(__OpenBSD__)
setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &on, sizeof(on));
#elif defined(IP_PKTINFO)
setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
#endif
}
#if SYSLOG_NG_ENABLE_IPV6 && defined(IPV6_RECVPKTINFO)
else if (self->bind_addr->sa.sa_family == AF_INET6)
setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
#endif
else
g_assert_not_reached();
}
static void
log_transport_udp_socket_free(LogTransport *s)
{
LogTransportUDP *self = (LogTransportUDP *)s;
g_sockaddr_unref(self->bind_addr);
log_transport_free_method(s);
}
LogTransport *
log_transport_udp_socket_new(gint fd)
{
LogTransportUDP *self = g_new0(LogTransportUDP, 1);
log_transport_dgram_socket_init_instance(&self->super, fd);
self->super.super.free_fn = log_transport_udp_socket_free;
self->super.parse_cmsg = log_transport_udp_parse_cmsg;
_setup_fd(self, fd);
return &self->super.super;
}
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