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/* LAPD over datagram user-mode example. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/application.h>
#include <osmocom/core/select.h>
#include <osmocom/abis/lapd.h>
#include <osmocom/netif/datagram.h>
#define DLAPDTEST 0
struct log_info_cat lapd_test_cat[] = {
[DLAPDTEST] = {
.name = "DLAPDTEST",
.description = "LAPD-mode test",
.color = "\033[1;35m",
.enabled = 1, .loglevel = LOGL_DEBUG,
},
};
const struct log_info lapd_test_log_info = {
.filter_fn = NULL,
.cat = lapd_test_cat,
.num_cat = ARRAY_SIZE(lapd_test_cat),
};
static struct osmo_dgram_conn *conn;
static struct lapd_instance *lapd;
static int sapi = 63, tei = 0;
void sighandler(int foo)
{
lapd_sap_stop(lapd, tei, sapi);
lapd_instance_free(lapd);
LOGP(DLINP, LOGL_NOTICE, "closing LAPD.\n");
exit(EXIT_SUCCESS);
}
static int read_cb(struct osmo_dgram_conn *conn, struct msgb *msg)
{
int error;
LOGP(DLINP, LOGL_NOTICE, "received message from datagram\n");
if (lapd_receive(lapd, msg, &error) < 0) {
LOGP(DLINP, LOGL_ERROR, "lapd_receive returned error!\n");
return -1;
}
return 0;
}
static void *tall_test;
void lapd_tx_cb(struct msgb *msg, void *cbdata)
{
LOGP(DLINP, LOGL_NOTICE, "sending message over datagram\n");
osmo_dgram_conn_send(conn, msg);
}
void lapd_rx_cb(struct osmo_dlsap_prim *dp, uint8_t tei, uint8_t sapi,
void *rx_cbdata)
{
struct msgb *msg = dp->oph.msg;
switch (dp->oph.primitive) {
case PRIM_DL_EST:
DEBUGP(DLAPDTEST, "DL_EST: sapi(%d) tei(%d)\n", sapi, tei);
break;
case PRIM_DL_REL:
DEBUGP(DLAPDTEST, "DL_REL: sapi(%d) tei(%d)\n", sapi, tei);
break;
case PRIM_DL_DATA:
case PRIM_DL_UNIT_DATA:
if (dp->oph.operation == PRIM_OP_INDICATION) {
msg->l2h = msg->l3h;
DEBUGP(DLAPDTEST, "RX: %s sapi=%d tei=%d\n",
osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)),
sapi, tei);
return;
}
break;
case PRIM_MDL_ERROR:
DEBUGP(DLMI, "MDL_EERROR: cause(%d)\n", dp->u.error_ind.cause);
break;
default:
printf("ERROR: unknown prim\n");
break;
}
}
static int kbd_cb(struct osmo_fd *fd, unsigned int what)
{
char buf[1024];
struct msgb *msg;
uint8_t *ptr;
int ret;
ret = read(STDIN_FILENO, buf, sizeof(buf));
LOGP(DLAPDTEST, LOGL_NOTICE, "read %d byte from keyboard\n", ret);
msg = msgb_alloc(1024, "LAPD/test");
if (msg == NULL) {
LOGP(DLINP, LOGL_ERROR, "lapd: cannot allocate message\n");
return 0;
}
ptr = msgb_put(msg, strlen(buf));
memcpy(ptr, buf, ret);
lapd_transmit(lapd, tei, sapi, msg);
LOGP(DLAPDTEST, LOGL_NOTICE, "message of %d bytes sent\n", msg->len);
return 0;
}
int main(void)
{
struct osmo_fd *kbd_ofd;
tall_test = talloc_named_const(NULL, 1, "lapd_test");
osmo_init_logging(&lapd_test_log_info);
log_set_log_level(osmo_stderr_target, 1);
/*
* initialize LAPD stuff.
*/
lapd = lapd_instance_alloc(0, lapd_tx_cb, NULL, lapd_rx_cb, NULL,
&lapd_profile_sat);
if (lapd == NULL) {
LOGP(DLINP, LOGL_ERROR, "cannot allocate instance\n");
exit(EXIT_FAILURE);
}
/*
* initialize datagram socket.
*/
conn = osmo_dgram_conn_create(tall_test);
if (conn == NULL) {
fprintf(stderr, "cannot create client\n");
exit(EXIT_FAILURE);
}
osmo_dgram_conn_set_local_addr(conn, "127.0.0.1");
osmo_dgram_conn_set_local_port(conn, 10000);
osmo_dgram_conn_set_remote_addr(conn, "127.0.0.1");
osmo_dgram_conn_set_remote_port(conn, 10001);
osmo_dgram_conn_set_read_cb(conn, read_cb);
if (osmo_dgram_conn_open(conn) < 0) {
fprintf(stderr, "cannot open client\n");
exit(EXIT_FAILURE);
}
if (lapd_sap_start(lapd, tei, sapi) < 0) {
LOGP(DLINP, LOGL_ERROR, "cannot start user-side LAPD\n");
exit(EXIT_FAILURE);
}
kbd_ofd = talloc_zero(tall_test, struct osmo_fd);
if (!kbd_ofd) {
LOGP(DLAPDTEST, LOGL_ERROR, "OOM\n");
exit(EXIT_FAILURE);
}
kbd_ofd->fd = STDIN_FILENO;
kbd_ofd->when = BSC_FD_READ;
kbd_ofd->data = conn;
kbd_ofd->cb = kbd_cb;
osmo_fd_register(kbd_ofd);
LOGP(DLINP, LOGL_NOTICE, "Entering main loop\n");
while(1) {
osmo_select_main(0);
}
}
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