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#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <arpa/inet.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/gsm/protocol/gsm_44_318.h>
#include <osmocom/gsm/gsm48.h>
#include "conn.h"
#include "ganc_data.h"
static struct msgb *unc_msgb_alloc(void)
{
return msgb_alloc_headroom(1024+128, 128, "GANC Tx");
}
static int unc_peer_tx(struct gan_peer *peer, struct msgb *msg)
{
struct gan_rc_csr_hdr *gh = (struct gan_rc_csr_hdr*) msg->data;
/* compute and fill-in length */
msg->l2h = msg->data;
gh->len = htons(msgb_l2len(msg)-2);
return osmo_conn_enqueue(peer->conn, msg);
}
static int tx_unc_reg_acc(struct gan_peer *peer)
{
struct msgb *msg = unc_msgb_alloc();
struct gan_rc_csr_hdr *gh = (struct gan_rc_csr_hdr*) msg->data;
if (!msg)
return -ENOMEM;
gh->pdisc = GA_PDISC_RC;
gh->msg_type = GA_MT_RC_REGISTER_ACCEPT;
#if 0
msgb_tlv_put(msg, GA_IE_GERAN_CELL_ID,,);
msgb_tlv_put(msg, GA_IE_LAC,,);
msgb_tlv_put(msg, GA_IE_GANC_CTRL_CH_DESC,,);
msgb_tlv_put(msg, GA_IE_TU3910_TIMER,,);
msgb_tlv_put(msg, GA_IE_TU3906_TIMER,,);
#endif
return unc_peer_tx(peer, msg);
}
static int tx_unc_disco_acc(struct gan_peer *peer, const char *segw_host,
const char *ganc_host)
{
struct msgb *msg = unc_msgb_alloc();
struct gan_rc_csr_hdr *gh = (struct gan_rc_csr_hdr*) msg->data;
if (!msg)
return -ENOMEM;
gh->pdisc = GA_PDISC_RC;
gh->msg_type = GA_MT_RC_DISCOVERY_ACCEPT;
msgb_tlv_put(msg, GA_IE_DEF_SEGW_FQDN, strlen(segw_host)+1, (uint8_t *) segw_host);
msgb_tlv_put(msg, GA_IE_DEF_GANC_FQDN, strlen(ganc_host)+1, (uint8_t *) ganc_host);
return unc_peer_tx(peer, msg);
}
static int rx_unc_discovery_req(struct gan_peer *peer, struct msgb *msg,
struct gan_rc_csr_hdr *gh)
{
struct tlv_parsed tp;
tlv_parse(&tp, &tvlv_att_def, gh->data, htons(gh->len), 0, 0);
if (TLVP_PRESENT(&tp, GA_IE_MI)) {
char mi_string[32];
gsm48_mi_to_string(mi_string, sizeof(mi_string),
TLVP_VAL(&tp, GA_IE_MI), TLVP_LEN(&tp, GA_IE_MI));
printf("DISCOVERY from %s\n", mi_string);
}
return tx_unc_disco_acc(peer, "segw.uma.sysmocom.de",
"ganc.uma.sysmocom.de");
}
static int rx_unc_rc(struct gan_peer *peer, struct msgb *msg, struct gan_rc_csr_hdr *gh)
{
switch (gh->msg_type) {
case GA_MT_RC_DISCOVERY_REQUEST:
return rx_unc_discovery_req(peer, msg, gh);
case GA_MT_RC_REGISTER_REQUEST:
case GA_MT_RC_DEREGISTER:
break;
}
return 0;
}
static int rx_unc_msg(struct gan_peer *peer, struct msgb *msg)
{
struct gan_rc_csr_hdr *gh = (struct gan_rc_csr_hdr *) msg->l2h;
printf("PDISC=%u TYPE=%u\n", gh->pdisc, gh->msg_type);
switch (gh->pdisc) {
case GA_PDISC_RC:
case GA_PDISC_CSR:
return rx_unc_rc(peer, msg, gh);
case GA_PDISC_PSR:
default:
break;
}
return 0;
}
static int unc_read_cb(struct osmo_conn *conn)
{
struct msgb *msg;
int rc, len;
msg = msgb_alloc_headroom(1024 + 128, 128, "UNC Read");
if (!msg)
return -ENOMEM;
rc = read(conn->queue.bfd.fd, msg->data, 2);
if (rc <= 0) {
msgb_free(msg);
osmo_conn_close(conn);
return rc;
} else if (rc != 2) {
msgb_free(msg);
fprintf(stderr, "unable to read 2 length bytes\n");
return -EIO;
}
msg->l2h = msg->data;
msgb_put(msg, rc);
len = ntohs(*(uint16_t *)msg->data);
rc = read(conn->queue.bfd.fd, msg->data+2, len);
if (rc < 0) {
msgb_free(msg);
osmo_conn_close(conn);
return rc;
} else if (rc != len) {
msgb_free(msg);
fprintf(stderr, "unable to read %u bytes following len\n", len);
return -EIO;
}
msgb_put(msg, rc);
return rx_unc_msg(conn->priv, msg);
}
static void unc_accept_cb(struct osmo_conn *conn)
{
struct gan_peer *peer = talloc_zero(conn, struct gan_peer);
printf("accepted connection\n");
peer->conn = conn;
conn->priv = peer;
}
int ganc_server_start(const char *host, uint16_t port)
{
struct osmo_link *link;
link = osmo_link_create(NULL, host, port, unc_read_cb, 10);
if (!link)
return -ENOMEM;
osmo_link_listen(link, unc_accept_cb);
return 0;
}
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