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/*
* Copyright 2015 Google Inc.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: xiaoj@google.com (Xiao Jia)
*
* Testing against a shared object (*.so) file.
*/
#include "so_testing.h"
#include <dlfcn.h>
#include "logging.h"
#include "netdev.h"
#include "packetdrill.h"
#include "run.h"
struct so_netdev {
struct netdev netdev; /* "inherit" from netdev */
struct packetdrill_interface *ifc; /* to be filled in later */
};
/* "Downcast" an abstract netdev to our flavor. */
static inline struct so_netdev *to_so_netdev(struct netdev *netdev)
{
return (struct so_netdev *)netdev;
}
static void so_netdev_free(struct netdev *a_netdev)
{
struct so_netdev *netdev = to_so_netdev(a_netdev);
memset(netdev, 0, sizeof(*netdev)); /* paranoia */
free(netdev);
}
static int so_netdev_send(struct netdev *a_netdev, struct packet *packet)
{
struct so_netdev *netdev = to_so_netdev(a_netdev);
assert(packet->ip_bytes > 0);
/* We do IPv4 and IPv6 */
assert(packet->ipv4 || packet->ipv6);
/* We only do TCP and ICMP */
assert(packet->tcp || packet->udp || packet->icmpv4 || packet->icmpv6);
return netdev->ifc->netdev_send(netdev->ifc->userdata,
packet_start(packet),
packet->ip_bytes);
}
static int so_netdev_receive(struct netdev *a_netdev, struct packet **packet,
char **error)
{
struct so_netdev *netdev = to_so_netdev(a_netdev);
enum packet_parse_result_t result;
enum packet_layer_t layer = PACKET_LAYER_3_IP;
size_t in_bytes;
assert(*packet == NULL); /* should be no packet yet */
for (;;) {
*packet = packet_new(PACKET_READ_BYTES);
in_bytes = (*packet)->buffer_bytes;
/* Sniff the next outbound packet from the stack under test. */
if (netdev->ifc->netdev_receive(netdev->ifc->userdata,
(*packet)->buffer, &in_bytes,
&((*packet)->time_usecs)))
goto next;
result = parse_packet(*packet, in_bytes, layer, error);
if (result == PACKET_OK)
return STATUS_OK;
if (result == PACKET_BAD)
return STATUS_ERR;
DEBUGP("parse_result:%d; error parsing packet: %s\n",
result, *error);
next:
packet_free(*packet);
*packet = NULL;
}
assert(!"should not be reached");
return STATUS_ERR; /* not reached */
}
static struct netdev_ops so_netdev_ops = {
.free = so_netdev_free,
.send = so_netdev_send,
.receive = so_netdev_receive,
};
struct netdev *so_netdev_new(struct config *config)
{
struct so_netdev *netdev = calloc(1, sizeof(struct so_netdev));
netdev->netdev.ops = &so_netdev_ops;
return (struct netdev *)netdev;
}
struct so_instance *so_instance_new(void)
{
return calloc(1, sizeof(struct so_instance));
}
int so_instance_init(struct so_instance *instance,
const struct config *config,
const struct script *script,
const struct state *state)
{
#if 0
packetdrill_interface_init_t init;
char *error;
instance->handle = dlopen(config->so_filename,
RTLD_NOW | RTLD_LOCAL | RTLD_NODELETE |
RTLD_DEEPBIND);
if (!instance->handle)
die("%s\n", dlerror());
dlerror(); /* clear any existing error */
init = dlsym(instance->handle, "packetdrill_interface_init");
error = dlerror();
if (error)
die("%s\n", error);
init(config->so_flags, &instance->ifc);
#else
extern void packetdrill_interface_init(const char *flags, struct packetdrill_interface *ifc);
instance->handle = (void *)1;
packetdrill_interface_init(config->so_flags, &instance->ifc);
#endif
to_so_netdev(state->netdev)->ifc = &instance->ifc;
return STATUS_OK;
}
void so_instance_free(struct so_instance *instance)
{
if (!instance)
return;
instance->ifc.free(instance->ifc.userdata);
// if (instance->handle)
// dlclose(instance->handle);
memset(instance, 0, sizeof(*instance));
free(instance);
}
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