summaryrefslogtreecommitdiffstats
path: root/osmo-gsup-hlr/src/gsup_server.c
blob: 41a03f47c5bbed0ce87af48b4eb1bae4821fa2df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
#include <errno.h>

#include <osmocom/core/msgb.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/abis/ipa.h>
#include <osmocom/abis/ipaccess.h>

#include "gsup_server.h"

static void osmo_gsup_server_send(struct osmo_gsup_conn *conn,
			     int proto_ext, struct msgb *msg_tx)
{
	ipa_prepend_header_ext(msg_tx, proto_ext);
	ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO);
	ipa_server_conn_send(conn->conn, msg_tx);
}

int osmo_gsup_conn_send(struct osmo_gsup_conn *conn, struct msgb *msg)
{
	if (!conn) {
		msgb_free(msg);
		return -ENOTCONN;
	}

	osmo_gsup_server_send(conn, IPAC_PROTO_EXT_GSUP, msg);

	return 0;
}

static int osmo_gsup_conn_oap_handle(struct osmo_gsup_conn *conn,
				struct msgb *msg_rx)
{
	int rc;
	struct msgb *msg_tx;
#if 0
	rc = oap_handle(&conn->oap_state, msg_rx, &msg_tx);
	msgb_free(msg_rx);
	if (rc < 0)
		return rc;

	if (msg_tx)
		osmo_gsup_conn_send(conn, IPAC_PROTO_EXT_OAP, msg_tx);
#endif
	return 0;
}


/* Data from a given client has arrived over the socket */
static int osmo_gsup_server_read_cb(struct ipa_server_conn *conn,
			       struct msgb *msg)
{
	struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
	struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
	struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
	int rc;
	static struct ipaccess_unit ipa_dev = {
		.unit_name = "HLR",
		/* FIXME */
	};

	msg->l2h = &hh->data[0];

	/* FIXME: not BTS for server side? */
#if 0
	rc = ipaccess_bts_handle_ccm(conn, &ipa_dev, msg);

	if (rc < 0) {
		LOGP(DLGSUP, LOGL_NOTICE,
		     "GSUP received an invalid IPA/CCM message from %s:%d\n",
		     conn->addr, conn->port);
		/* Link has been closed */
		clnt->is_connected = 0;
		msgb_free(msg);
		return -1;
	}

	if (rc == 1) {
		uint8_t msg_type = *(msg->l2h);
		/* CCM message */
		if (msg_type == IPAC_MSGT_PONG) {
			LOGP(DLGSUP, LOGL_DEBUG, "GSUP receiving PONG\n");
			clnt->got_ipa_pong = 1;
		}

		msgb_free(msg);
		return 0;
	}
#endif

	if (hh->proto != IPAC_PROTO_OSMO)
		goto invalid;

	if (!he || msgb_l2len(msg) < sizeof(*he))
		goto invalid;

	msg->l2h = &he->data[0];

	if (he->proto == IPAC_PROTO_EXT_GSUP) {
		OSMO_ASSERT(clnt->server->read_cb != NULL);
		clnt->server->read_cb(clnt, msg);
		/* expecting read_cb() to free msg */
	} else if (he->proto == IPAC_PROTO_EXT_OAP) {
		return osmo_gsup_conn_oap_handle(clnt, msg);
		/* osmo_gsup_client_oap_handle frees msg */
	} else
		goto invalid;

	return 0;

invalid:
	LOGP(DLGSUP, LOGL_NOTICE,
	     "GSUP received an invalid IPA message from %s:%d, size = %d\n",
	     conn->addr, conn->port, msgb_length(msg));
	msgb_free(msg);
	return -1;

}

static int osmo_gsup_server_closed_cb(struct ipa_server_conn *conn)
{
	struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;

	LOGP(DLGSUP, LOGL_INFO, "Lost GSUP client %s:%d\n",
		conn->addr, conn->port);

	llist_del(&clnt->list);

	return 0;
}

/* a client has connected to the server socket and we have accept()ed it */
static int osmo_gsup_server_accept_cb(struct ipa_server_link *link, int fd)
{
	struct osmo_gsup_conn *conn;
	struct osmo_gsup_server *gsups =
		(struct osmo_gsup_server *) link->data;

	conn = talloc_zero(link->data, struct osmo_gsup_conn);
	OSMO_ASSERT(conn);

	conn->conn = ipa_server_conn_create(conn, link, fd,
					   osmo_gsup_server_read_cb,
					   osmo_gsup_server_closed_cb, conn);
	OSMO_ASSERT(conn->conn);

	/* link data structure with server structure */
	conn->server = gsups;
	llist_add_tail(&conn->list, &gsups->clients);

	LOGP(DLGSUP, LOGL_INFO, "New GSUP client %s:%d\n",
		conn->conn->addr, conn->conn->port);
#if 0
	rc = oap_init(&gsups->oap_config, &conn->oap_state);
	if (rc != 0)
		goto failed;
failed:
#endif
	return 0;
}

struct osmo_gsup_server *
osmo_gsup_server_create(void *ctx, const char *ip_addr,
			uint16_t tcp_port,
			osmo_gsup_read_cb_t read_cb)
{
	struct osmo_gsup_server *gsups;
	int rc;

	gsups = talloc_zero(ctx, struct osmo_gsup_server);
	OSMO_ASSERT(gsups);

	INIT_LLIST_HEAD(&gsups->clients);

	gsups->link = ipa_server_link_create(gsups,
					/* no e1inp */ NULL,
					ip_addr, tcp_port,
					osmo_gsup_server_accept_cb,
					gsups);
	if (!gsups->link)
		goto failed;

	gsups->read_cb = read_cb;

	rc = ipa_server_link_open(gsups->link);
	if (rc < 0)
		goto failed;

	return gsups;

failed:
	osmo_gsup_server_destroy(gsups);
	return NULL;
}

void osmo_gsup_server_destroy(struct osmo_gsup_server *gsups)
{
	if (gsups->link) {
		ipa_server_link_close(gsups->link);
		ipa_server_link_destroy(gsups->link);
		gsups->link = NULL;
	}
	talloc_free(gsups);
}