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/*
* proto.c
*
* (C) 2019 by Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*
* This program 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 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/utils.h>
#include <osmocom/e1d/proto.h>
#include "log.h"
const struct value_string osmo_e1dp_msg_type_names[] = {
{ E1DP_CMD_INTF_QUERY, "CMD_INTF_QUERY" },
{ E1DP_CMD_LINE_QUERY, "CMD_LINE_QUERY" },
{ E1DP_CMD_TS_QUERY, "CMD_TS_QUERY" },
{ E1DP_CMD_TS_OPEN, "CMD_TS_OPEN" },
{ E1DP_EVT_TYPE, "EVT_TYPE" },
{ E1DP_RESP_TYPE, "RESP_TYPE" },
{ E1DP_ERR_TYPE, "ERR_TYPE" },
{ 0, NULL }
};
const struct value_string osmo_e1dp_line_mode_names[] = {
{ E1DP_LMODE_OFF, "OFF" },
{ E1DP_LMODE_CHANNELIZED, "CHANNELIZED" },
{ E1DP_LMODE_SUPERCHANNEL, "SUPERCHANNEL" },
{ 0, NULL }
};
const struct value_string osmo_e1dp_ts_mode_names[] = {
{ E1DP_TSMODE_OFF, "OFF" },
{ E1DP_TSMODE_RAW, "RAW" },
{ E1DP_TSMODE_HDLCFCS, "HDLC-FCS" },
{ 0, NULL }
};
struct msgb *
osmo_e1dp_recv(struct osmo_fd *ofd, int *fd)
{
struct msgb *msgb;
struct osmo_e1dp_msg_hdr *hdr;
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
char cms[CMSG_SPACE(sizeof(int))];
int rc;
msgb = msgb_alloc(E1DP_MAX_LEN, "e1d proto rx message");
memset(&msg, 0x00, sizeof(msg));
iov.iov_base = msgb->data;
iov.iov_len = E1DP_MAX_LEN;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = (caddr_t) cms;
msg.msg_controllen = sizeof(cms);
rc = recvmsg(ofd->fd, &msg, MSG_WAITALL | MSG_CMSG_CLOEXEC);
if (rc == 0)
goto err;
if (rc < (int)sizeof(struct osmo_e1dp_msg_hdr)) {
LOGP(DE1D, LOGL_ERROR, "Failed to read packet header.\n");
goto err;
}
msgb->l1h = msgb_put(msgb, sizeof(struct osmo_e1dp_msg_hdr));
hdr = msgb_l1(msgb);
if ((hdr->magic != E1DP_MAGIC) || (hdr->len < sizeof(struct osmo_e1dp_msg_hdr))) {
LOGP(DE1D, LOGL_ERROR, "Invalid packet header.\n");
goto err;
}
if (hdr->len > sizeof(struct osmo_e1dp_msg_hdr))
msgb->l2h = msgb_put(msgb, hdr->len - sizeof(struct osmo_e1dp_msg_hdr));
else
msgb->l2h = msgb->tail;
if (fd) {
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg) {
memmove(fd, CMSG_DATA(cmsg), sizeof(int));
} else {
*fd = -1;
}
}
LOGP(DE1D, LOGL_DEBUG, "rx pkt: %d %s\n", fd ? *fd : -2, msgb_hexdump(msgb));
return msgb;
err:
msgb_free(msgb);
return NULL;
}
int
osmo_e1dp_send(struct osmo_fd *ofd, struct msgb *msgb, int fd)
{
struct msghdr msg;
struct iovec iov;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
int rc;
memset(&msg, 0x00, sizeof(msg));
iov.iov_base = msgb->data;
iov.iov_len = msgb_length(msgb);
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
if (fd >= 0) {
msg.msg_control = cmsgbuf;
msg.msg_controllen = CMSG_LEN(sizeof(int));
struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
memmove(CMSG_DATA(cmsg), &fd, sizeof(int));
}
rc = sendmsg(ofd->fd, &msg, 0);
if (rc < 0) {
LOGP(DE1D, LOGL_ERROR, "Failed to send packet.\n");
perror("tx");
}
if (fd >= 0)
close(fd);
LOGP(DE1D, LOGL_DEBUG, "tx pkt: %d %s\n", msgb_length(msgb), msgb_hexdump(msgb));
return rc;
}
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