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/* LAPD over datagram user-mode example. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <osmocom/core/linuxlist.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>
static LLIST_HEAD(msg_sent_list);
struct msg_sent {
struct llist_head head;
struct msgb *msg;
int num;
struct timeval tv;
};
#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;
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)
{
int error;
struct msgb *msg;
msg = msgb_alloc(1200, "LAPD/test");
if (msg == NULL) {
LOGP(DLAPDTEST, LOGL_ERROR, "cannot allocate message\n");
return -1;
}
if (osmo_dgram_recv(conn, msg) < 0) {
msgb_free(msg);
LOGP(DLAPDTEST, LOGL_ERROR, "cannot receive message\n");
return -1;
}
if (lapd_receive(lapd, msg, &error) < 0) {
msgb_free(msg);
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_DEBUG, "sending message over datagram\n");
osmo_dgram_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;
int *__msgs = rx_cbdata;
int num_msgs = *__msgs;
switch (dp->oph.primitive) {
case PRIM_DL_EST:
DEBUGP(DLAPDTEST, "DL_EST: sapi(%d) tei(%d)\n", sapi, tei);
int i;
for (i=0; i<num_msgs; i++) {
struct msgb *msg;
struct msg_sent *msg_sent;
char *ptr;
int x;
msg = msgb_alloc(1024, "LAPD/test");
if (msg == NULL) {
LOGP(DLINP, LOGL_ERROR, "cannot alloc msg\n");
return;
}
ptr = (char *)msgb_put(msg, sizeof(int));
x = htonl(i);
memcpy(ptr, &x, sizeof(int));
msg_sent = talloc_zero(NULL, struct msg_sent);
if (msg_sent == NULL) {
LOGP(DLINP, LOGL_ERROR, "can't alloc struct\n");
return;
}
msg_sent->msg = msg;
gettimeofday(&msg_sent->tv, NULL);
msg_sent->num = i;
llist_add(&msg_sent->head, &msg_sent_list);
lapd_transmit(lapd, tei, sapi, msg);
LOGP(DLAPDTEST, LOGL_DEBUG, "enqueueing msg %d of "
"%d bytes to be sent over LAPD\n", i, msg->len);
}
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);
int num;
struct msg_sent *cur, *tmp, *found = NULL;
num = ntohl(*((int *)msg->data));
LOGP(DLINP, LOGL_DEBUG,
"received msg number %d\n", num);
llist_for_each_entry_safe(cur, tmp,
&msg_sent_list, head) {
if (cur->num == num) {
llist_del(&cur->head);
found = cur;
break;
}
}
if (found) {
struct timeval tv, diff;
gettimeofday(&tv, NULL);
timersub(&tv, &found->tv, &diff);
LOGP(DLINP, LOGL_NOTICE, "message %d replied "
"in %lu.%.6lu\n",
num, diff.tv_sec, diff.tv_usec);
talloc_free(found);
} else {
LOGP(DLINP, LOGL_ERROR,
"message %d not found!\n", num);
}
}
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;
}
}
int main(int argc, char *argv[])
{
int num_msgs;
signal(SIGINT, sighandler);
if (argc != 2) {
printf("Usage: %s [num_msgs]\n", argv[0]);
exit(EXIT_FAILURE);
}
num_msgs = atoi(argv[1]);
tall_test = talloc_named_const(NULL, 1, "lapd_test");
osmo_init_logging(&lapd_test_log_info);
log_set_log_level(osmo_stderr_target, LOGL_NOTICE);
/*
* initialize LAPD stuff.
*/
lapd = lapd_instance_alloc(0, lapd_tx_cb, NULL, lapd_rx_cb, &num_msgs,
&lapd_profile_sat);
if (lapd == NULL) {
LOGP(DLINP, LOGL_ERROR, "cannot allocate instance\n");
exit(EXIT_FAILURE);
}
/*
* initialize datagram socket.
*/
conn = osmo_dgram_create(tall_test);
if (conn == NULL) {
fprintf(stderr, "cannot create client\n");
exit(EXIT_FAILURE);
}
osmo_dgram_set_local_addr(conn, "127.0.0.1");
osmo_dgram_set_local_port(conn, 10000);
osmo_dgram_set_remote_addr(conn, "127.0.0.1");
osmo_dgram_set_remote_port(conn, 10001);
osmo_dgram_set_read_cb(conn, read_cb);
if (osmo_dgram_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);
}
LOGP(DLINP, LOGL_NOTICE, "Entering main loop\n");
while(1) {
osmo_select_main(0);
}
}
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