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/*
* l1ctl_link.c
*
* L1CTL link handling
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* 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 <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/bb/common/logging.h>
#include "l1ctl_link.h"
#define L1CTL_LENGTH 256
#define L1CTL_HEADROOM 32
static int
_l1l_read(struct osmo_fd *fd)
{
struct l1ctl_link *l1l = fd->data;
struct msgb *msg;
uint16_t len;
int rc;
msg = msgb_alloc_headroom(L1CTL_LENGTH+L1CTL_HEADROOM, L1CTL_HEADROOM, "L1CTL");
if (!msg) {
LOGP(DL1C, LOGL_ERROR, "Failed to allocate msg.\n");
return -ENOMEM;
}
rc = read(fd->fd, &len, sizeof(len));
if (rc < sizeof(len)) {
LOGP(DL1C, LOGL_ERROR, "l1ctl socket failed\n");
msgb_free(msg);
if (rc >= 0)
rc = -EIO;
l1l_close(l1l);
return rc;
}
len = ntohs(len);
if (len > L1CTL_LENGTH) {
LOGP(DL1C, LOGL_ERROR, "Length is too big: %u\n", len);
msgb_free(msg);
return -EINVAL;
}
msg->l1h = msgb_put(msg, len);
rc = read(fd->fd, msg->l1h, msgb_l1len(msg));
if (rc != msgb_l1len(msg)) {
LOGP(DL1C, LOGL_ERROR, "Can not read data: len=%d rc=%d "
"errno=%d\n", len, rc, errno);
msgb_free(msg);
return rc;
}
return l1l->cb(l1l->cb_data, msg);
}
static int
_l1l_write(struct osmo_fd *fd, struct msgb *msg)
{
int rc;
if (fd->fd <= 0)
return -EINVAL;
rc = write(fd->fd, msg->data, msg->len);
if (rc != msg->len) {
LOGP(DL1C, LOGL_ERROR, "Failed to write data: rc: %d\n", rc);
return rc;
}
return 0;
}
int
l1l_open(struct l1ctl_link *l1l,
const char *path, l1ctl_cb_t cb, void *cb_data)
{
int rc, fd;
struct sockaddr_un local;
l1l->cb = cb;
l1l->cb_data = cb_data;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to create unix domain socket.\n");
return fd;
}
l1l->wq.bfd.fd = fd;
local.sun_family = AF_UNIX;
strncpy(local.sun_path, path, sizeof(local.sun_path));
local.sun_path[sizeof(local.sun_path) - 1] = '\0';
rc = connect(fd, (struct sockaddr *) &local, sizeof(local));
if (rc < 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to connect to '%s': %s\n",
local.sun_path, strerror(errno));
close(fd);
return rc;
}
osmo_wqueue_init(&l1l->wq, 100);
l1l->wq.bfd.data = l1l;
l1l->wq.bfd.when = BSC_FD_READ;
l1l->wq.read_cb = _l1l_read;
l1l->wq.write_cb = _l1l_write;
rc = osmo_fd_register(&l1l->wq.bfd);
if (rc != 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to register fd.\n");
close(fd);
return rc;
}
return 0;
}
int
l1l_close(struct l1ctl_link *l1l)
{
if (l1l->wq.bfd.fd <= 0)
return -EINVAL;
osmo_fd_unregister(&l1l->wq.bfd);
close(l1l->wq.bfd.fd);
l1l->wq.bfd.fd = -1;
osmo_wqueue_clear(&l1l->wq);
return 0;
}
int
l1l_send(struct l1ctl_link *l1l, struct msgb *msg)
{
uint16_t *len;
DEBUGP(DL1C, "Sending: '%s'\n", osmo_hexdump(msg->data, msg->len));
if (msg->l1h != msg->data)
LOGP(DL1C, LOGL_NOTICE, "Message L1 header != Message Data\n");
/* prepend 16bit length before sending */
len = (uint16_t *) msgb_push(msg, sizeof(*len));
*len = htons(msg->len - sizeof(*len));
if (osmo_wqueue_enqueue(&l1l->wq, msg) != 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to enqueue msg.\n");
msgb_free(msg);
return -EIO;
}
return 0;
}
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