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/* E1 timeslot "pipe" utility: Open a 64k timeslot of osmo-e1d and connect to stdin/stdout
*
* (C) 2020 by Harald Welte <laforge@osmocom.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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.
*/
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/types.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/application.h>
#include <osmocom/e1d/proto_clnt.h>
static void *g_ctx;
static struct osmo_e1dp_client *g_client;
static struct osmo_fd ts_ofd;
static enum osmo_e1dp_ts_mode g_mode = E1DP_TSMODE_RAW;
static int outfd = 1;
static int infd = 0;
static int ts_open(uint8_t intf_nr, uint8_t line_nr, uint8_t ts_nr,
enum osmo_e1dp_ts_mode mode, uint16_t bufsize)
{
int rc = osmo_e1dp_client_ts_open(g_client, intf_nr, line_nr, ts_nr, mode, bufsize);
if (rc < 0)
fprintf(stderr, "Cannot open e1d timeslot %u:%u:%u\n", intf_nr, line_nr, ts_nr);
return rc;
}
static int ts_fd_cb(struct osmo_fd *ofd, unsigned int what)
{
uint8_t buf[32*10];
int rc, count;
if (what & OSMO_FD_READ) {
rc = read(ofd->fd, buf, sizeof(buf));
if (rc < 0 && errno != EAGAIN)
exit(3);
else if (rc > 0) {
count = rc;
rc = write(outfd, buf, count);
if (rc < 0 && errno != EAGAIN)
exit(3);
}
}
if (what & OSMO_FD_WRITE) {
unsigned int read_len = sizeof(buf);
if (g_mode == E1DP_TSMODE_HDLCFCS)
read_len = E1DP_MAX_SIZE_HDLC;
rc = read(infd, buf, read_len);
if (rc < 0 && errno != EAGAIN)
exit(4);
else if (rc == 0) { /* EOF */
rc = lseek(infd, 0, SEEK_SET);
if (rc < 0) {
perror("rewind input file");
exit(5);
}
} else if (rc > 0) {
count = rc;
rc = write(ofd->fd, buf, count);
if (rc < 0 && errno != EAGAIN)
exit(4);
}
}
return 0;
}
static int set_nonblock(int fd)
{
int rc, flags;
flags = fcntl(fd, F_GETFL);
OSMO_ASSERT(flags >= 0);
rc = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
OSMO_ASSERT(rc >= 0);
return 0;
}
static void print_help(void)
{
printf(
" -h --help This help message\n"
" -p --path PATH Path of the osmo-e1d control socket\n"
" -i --interface <0-255> E1 Interface Number\n"
" -l --line <0-255> E1 Line Number\n"
" -t --timeslot <0-31> E1 Timeslot Number\n"
" -m --mode (RAW|HDLC-FCS) E1 Timeslot Mode\n"
" -r --read FILE Read from FILE instead of STDIN\n"
);
}
int main(int argc, char **argv)
{
int intf_nr = -1, line_nr = -1, ts_nr = -1;
char *path = E1DP_DEFAULT_SOCKET;
int bufsize = 160;
int tsfd;
int option_index, rc;
g_ctx = talloc_named_const(NULL, 0, "g_ctx");
OSMO_ASSERT(g_ctx);
osmo_init_logging2(g_ctx, NULL);
/* FIXME: handle options */
while (1) {
int c;
static const struct option long_options[] = {
{ "help", 0, 0, 'h' },
{ "path", 1, 0, 'p' },
{ "interface", 1, 0, 'i' },
{ "line", 1, 0, 'l' },
{ "timeslot", 1, 0, 't' },
{ "mode", 1, 0, 'm' },
{ "read", 1, 0, 'r' },
{ "read-bufsize", 1, 0, 'b' },
{ 0,0,0,0 }
};
c = getopt_long(argc, argv, "hp:i:l:t:m:r:b:", long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'h':
print_help();
exit(0);
case 'p':
path = optarg;
break;
case 'i':
intf_nr = atoi(optarg);
break;
case 'l':
line_nr = atoi(optarg);
break;
case 't':
ts_nr = atoi(optarg);
break;
case 'm':
rc = get_string_value(osmo_e1dp_ts_mode_names, optarg);
if (rc < 0) {
fprintf(stderr, "Unknown mode '%s'\n", optarg);
exit(2);
}
g_mode = rc;
break;
case 'r':
rc = open(optarg, 0, O_RDONLY);
if (rc < 0) {
fprintf(stderr, "Unable to open '%s': %s\n", optarg, strerror(errno));
exit(2);
}
infd = rc;
break;
case 'b':
bufsize = atoi(optarg);
break;
}
}
if (intf_nr == -1 || line_nr == -1 || ts_nr == -1) {
fprintf(stderr, "You must at least specify interface, line and timeslot numbers\n");
exit(2);
}
g_client = osmo_e1dp_client_create(g_ctx, path);
if (!g_client) {
fprintf(stderr, "Cannot establish connection to osmo-e1d at %s\n", path);
exit(1);
}
tsfd = ts_open(intf_nr, line_nr, ts_nr, g_mode, bufsize);
if (tsfd < 0)
exit(2);
osmo_fd_setup(&ts_ofd, tsfd, OSMO_FD_READ|OSMO_FD_WRITE, ts_fd_cb, NULL, 0);
osmo_fd_register(&ts_ofd);
set_nonblock(infd);
set_nonblock(outfd);
while (1) {
osmo_select_main(0);
}
}
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