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/* OpenBSC Abis input driver for ip.access */
/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
*
* 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 <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <osmocore/select.h>
#include <osmocore/msgb.h>
#include <osmocore/talloc.h>
#include <ipaccess.h>
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
#endif
#define TS1_ALLOC_SIZE 4096
static const uint8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG };
static const uint8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK };
static const uint8_t id_req[] = { 0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
0x01, IPAC_IDTAG_UNIT,
0x01, IPAC_IDTAG_MACADDR,
0x01, IPAC_IDTAG_LOCATION1,
0x01, IPAC_IDTAG_LOCATION2,
0x01, IPAC_IDTAG_EQUIPVERS,
0x01, IPAC_IDTAG_SWVERSION,
0x01, IPAC_IDTAG_UNITNAME,
0x01, IPAC_IDTAG_SERNR,
};
static const char *idtag_names[] = {
[IPAC_IDTAG_SERNR] = "Serial_Number",
[IPAC_IDTAG_UNITNAME] = "Unit_Name",
[IPAC_IDTAG_LOCATION1] = "Location_1",
[IPAC_IDTAG_LOCATION2] = "Location_2",
[IPAC_IDTAG_EQUIPVERS] = "Equipment_Version",
[IPAC_IDTAG_SWVERSION] = "Software_Version",
[IPAC_IDTAG_IPADDR] = "IP_Address",
[IPAC_IDTAG_MACADDR] = "MAC_Address",
[IPAC_IDTAG_UNIT] = "Unit_ID",
};
static const char *ipac_idtag_name(int tag)
{
if (tag >= ARRAY_SIZE(idtag_names))
return "unknown";
return idtag_names[tag];
}
/* send the id ack */
int ipaccess_send_id_ack(int fd)
{
return write(fd, id_ack, sizeof(id_ack));
}
int ipaccess_send_id_req(int fd)
{
return write(fd, id_req, sizeof(id_req));
}
/* base handling of the ip.access protocol */
int ipaccess_rcvmsg_base(struct msgb *msg,
struct bsc_fd *bfd)
{
uint8_t msg_type = *(msg->l2h);
int ret = 0;
switch (msg_type) {
case IPAC_MSGT_PING:
ret = write(bfd->fd, pong, sizeof(pong));
break;
case IPAC_MSGT_PONG:
break;
case IPAC_MSGT_ID_ACK:
ret = ipaccess_send_id_ack(bfd->fd);
break;
}
return 0;
}
/*
* read one ipa message from the socket
* return NULL in case of error
*/
struct msgb *ipaccess_read_msg(struct bsc_fd *bfd, int *error)
{
struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "Abis/IP");
struct ipaccess_head *hh;
int len, ret = 0;
if (!msg) {
*error = -ENOMEM;
return NULL;
}
/* first read our 3-byte header */
hh = (struct ipaccess_head *) msg->data;
ret = recv(bfd->fd, msg->data, 3, 0);
if (ret < 0) {
msgb_free(msg);
*error = ret;
return NULL;
} else if (ret == 0) {
msgb_free(msg);
*error = ret;
return NULL;
}
msgb_put(msg, ret);
/* then read te length as specified in header */
msg->l2h = msg->data + sizeof(*hh);
len = ntohs(hh->len);
ret = recv(bfd->fd, msg->l2h, len, 0);
if (ret < len) {
msgb_free(msg);
*error = -EIO;
return NULL;
}
msgb_put(msg, ret);
return msg;
}
void ipaccess_prepend_header(struct msgb *msg, int proto)
{
struct ipaccess_head *hh;
/* prepend the ip.access header */
hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
hh->len = htons(msg->len - sizeof(*hh));
hh->proto = proto;
}
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