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/*
* osmo-pcap-client code
*
* (C) 2011 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2011 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmo-pcap/osmo_pcap_client.h>
#include <osmo-pcap/common.h>
#include <osmo-pcap/wireformat.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>
static void _osmo_client_connect(void *_data)
{
osmo_client_connect((struct osmo_pcap_client *) _data);
}
static void lost_connection(struct osmo_pcap_client *client)
{
if (client->wqueue.bfd.fd >= 0) {
osmo_fd_unregister(&client->wqueue.bfd);
close(client->wqueue.bfd.fd);
client->wqueue.bfd.fd = -1;
}
client->timer.cb = _osmo_client_connect;
client->timer.data = client;
osmo_timer_schedule(&client->timer, 2, 0);
}
static void write_data(struct osmo_pcap_client *client, struct msgb *msg)
{
if (osmo_wqueue_enqueue(&client->wqueue, msg) != 0) {
LOGP(DCLIENT, LOGL_ERROR, "Failed to enqueue.\n");
msgb_free(msg);
return;
}
}
static int read_cb(struct osmo_fd *fd)
{
char buf[4096];
int rc;
rc = read(fd->fd, buf, sizeof(buf));
if (rc <= 0) {
struct osmo_pcap_client *client = fd->data;
LOGP(DCLIENT, LOGL_ERROR, "Lost connection on read.\n");
lost_connection(client);
return -1;
}
return 0;
}
static int write_cb(struct osmo_fd *fd, struct msgb *msg)
{
int rc;
rc = write(fd->fd, msg->data, msg->len);
if (rc < 0) {
struct osmo_pcap_client *client = fd->data;
LOGP(DCLIENT, LOGL_ERROR, "Lost connection on write.\n");
lost_connection(client);
return -1;
}
return 0;
}
void osmo_client_send_data(struct osmo_pcap_client *client,
struct pcap_pkthdr *in_hdr, const uint8_t *data)
{
struct osmo_pcap_data *om_hdr;
struct pcap_pkthdr *hdr;
struct msgb *msg;
msg = msgb_alloc(4096, "data-data");
if (!msg) {
LOGP(DCLIENT, LOGL_ERROR, "Failed to allocate.\n");
return;
}
om_hdr = (struct osmo_pcap_data *) msgb_put(msg, sizeof(*om_hdr));
om_hdr->type = PKT_LINK_DATA;
msg->l2h = msgb_put(msg, sizeof(*hdr));
hdr = (struct pcap_pkthdr *) msg->l2h;
*hdr = *in_hdr;
msg->l3h = msgb_put(msg, in_hdr->caplen);
memcpy(msg->l3h, data, in_hdr->caplen);
om_hdr->len = msgb_l2len(msg);
write_data(client, msg);
}
void osmo_client_send_link(struct osmo_pcap_client *client)
{
struct pcap_file_header *hdr;
struct osmo_pcap_data *om_hdr;
struct msgb *msg = msgb_alloc(4096, "link-data");
if (!msg) {
LOGP(DCLIENT, LOGL_ERROR, "Failed to allocate data.\n");
return;
}
om_hdr = (struct osmo_pcap_data *) msgb_put(msg, sizeof(*om_hdr));
om_hdr->type = PKT_LINK_HDR;
om_hdr->len = sizeof(*hdr);
hdr = (struct pcap_file_header *) msgb_put(msg, sizeof(*hdr));
hdr->magic = 0xa1b2c3d4;
hdr->version_major = 2;
hdr->version_minor = 4;
hdr->thiszone = 0;
hdr->sigfigs = 0;
hdr->snaplen = UINT_MAX;
hdr->linktype = pcap_datalink(client->handle);
write_data(client, msg);
}
void osmo_client_connect(struct osmo_pcap_client *client)
{
int fd;
client->wqueue.read_cb = read_cb;
client->wqueue.write_cb = write_cb;
client->wqueue.bfd.when = BSC_FD_READ;
client->wqueue.bfd.data = client;
osmo_wqueue_clear(&client->wqueue);
fd = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP,
client->srv_ip, client->srv_port, 0);
if (fd < 0) {
LOGP(DCLIENT, LOGL_ERROR,
"Failed to connect to %s:%d\n",
client->srv_ip, client->srv_port);
lost_connection(client);
return;
}
client->wqueue.bfd.fd = fd;
if (osmo_fd_register(&client->wqueue.bfd) != 0) {
LOGP(DCLIENT, LOGL_ERROR,
"Failed to register to BFD.\n");
lost_connection(client);
return;
}
osmo_client_send_link(client);
}
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