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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* Point-to-Point (PP) Short Message Service (SMS)
* Support on Mobile Radio Interface
* 3GPP TS 04.11 version 7.1.0 Release 1998 / ETSI TS 100 942 V7.1.0 */
/* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
*
* All Rights Reserved
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include <openbsc/msgb.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/gsm_04_11.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/abis_rsl.h>
#define GSM411_ALLOC_SIZE 1024
#define GSM411_ALLOC_HEADROOM 128
static struct msgb *gsm411_msgb_alloc(void)
{
return msgb_alloc_headroom(GSM411_ALLOC_SIZE, GSM411_ALLOC_HEADROOM);
}
static int gsm0411_sendmsg(struct msgb *msg)
{
if (msg->lchan)
msg->trx = msg->lchan->ts->trx;
msg->l3h = msg->data;
return rsl_data_request(msg, 0);
}
static char *gsm411_7bit_decode(u_int8_t *user_data, u_int8_t length)
{
u_int8_t d_off = 0, b_off = 0;
u_int8_t i;
char *text = malloc(length+1);
for (i=0;i<length;i++) {
text[i] = ((user_data[d_off] + (user_data[d_off+1]<<8)) & (0x7f<<b_off))>>b_off;
b_off += 7;
if (b_off >= 8) {
d_off += 1;
b_off -= 8;
}
}
text[i] = 0;
return text;
}
static int gsm411_sms_submit_from_msgb(struct msgb *msg)
{
u_int8_t *smsp = msgb_sms(msg);
struct sms_submit *sms;
sms = malloc(sizeof(*sms));
sms->mti = *smsp & 0x03;
sms->mms = !!(*smsp & 0x04);
sms->vpf = (*smsp & 0x18) >> 3;
sms->sri = !!(*smsp & 0x20);
sms->udhi= !!(*smsp & 0x40);
sms->rp = !!(*smsp & 0x80);
smsp++;
sms->msg_ref = *smsp++;
/* Skip destination address for now */
smsp += 2 + *smsp/2 + *smsp%2;
sms->pid = *smsp++;
sms->dcs = *smsp++;
switch (sms->vpf)
{
case 2: /* relative */
sms->vp = *smsp++;
break;
default:
DEBUGP(DSMS, "SMS Validity period not implemented: 0x%02x\n",
sms->vpf);
}
sms->ud_len = *smsp++;
sms->user_data = gsm411_7bit_decode(smsp, sms->ud_len);
DEBUGP(DSMS, "SMS:\nMTI: 0x%02x, VPF: 0x%02x, MR: 0x%02x\n"
"PID: 0x%02x, DCS: 0x%02x, UserDataLength: 0x%02x\n"
"UserData: \"%s\"\n", sms->mti, sms->vpf, sms->msg_ref,
sms->pid, sms->dcs, sms->ud_len, sms->user_data);
free(sms);
return 0;
}
static int gsm411_send_rp_ack(struct gsm_lchan *lchan, u_int8_t trans_id,
u_int8_t msg_ref)
{
struct msgb *msg = gsm411_msgb_alloc();
struct gsm48_hdr *gh;
struct gsm411_rp_hdr *rp;
msg->lchan = lchan;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
// Outgoing needs the highest bit set
gh->proto_discr = GSM48_PDISC_SMS | trans_id<<4 | 0x80;
gh->msg_type = GSM411_MT_CP_DATA;
rp = (struct gsm411_rp_hdr *)msgb_put(msg, sizeof(*rp));
rp->len = 2;
rp->msg_type = GSM411_MT_RP_ACK_MT;
rp->msg_ref = msg_ref;
DEBUGP(DSMS, "TX: SMS RP ACK\n");
return gsm0411_sendmsg(msg);
}
static int gsm411_send_rp_error(struct gsm_lchan *lchan, u_int8_t trans_id,
u_int8_t msg_ref)
{
struct msgb *msg = gsm411_msgb_alloc();
struct gsm48_hdr *gh;
struct gsm411_rp_hdr *rp;
msg->lchan = lchan;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
// Outgoing needs the highest bit set
gh->proto_discr = GSM48_PDISC_SMS | trans_id<<4 | 0x80;
gh->msg_type = GSM411_MT_CP_DATA;
rp = (struct gsm411_rp_hdr *)msgb_put(msg, sizeof(*rp));
rp->msg_type = GSM411_MT_RP_ERROR_MT;
rp->msg_ref = msg_ref;
DEBUGP(DSMS, "TX: SMS RP ERROR\n");
return gsm0411_sendmsg(msg);
}
static int gsm411_cp_data(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
int rc = 0;
struct gsm411_rp_hdr *rp_data = (struct gsm411_rp_hdr*)&gh->data;
u_int8_t msg_type = rp_data->msg_type & 0x07;
switch (msg_type) {
case GSM411_MT_RP_DATA_MO:
DEBUGP(DSMS, "SMS RP-DATA (MO)\n");
/* Skip SMSC no and RP-UD length */
msg->smsh = &rp_data->data[1] + rp_data->data[1] + 2;
gsm411_sms_submit_from_msgb(msg);
gsm411_send_rp_ack(msg->lchan, (gh->proto_discr & 0xf0)>>4, rp_data->msg_ref);
break;
default:
DEBUGP(DSMS, "Unimplemented RP type 0x%02x\n", msg_type);
break;
}
return rc;
}
int gsm0411_rcv_sms(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
u_int8_t msg_type = gh->msg_type;
int rc = 0;
DEBUGP(DSMS, "SMS Message\n");
switch(msg_type) {
case GSM411_MT_CP_DATA:
DEBUGP(DSMS, "SMS CP-DATA\n");
rc = gsm411_cp_data(msg);
break;
case GSM411_MT_CP_ACK:
DEBUGP(DSMS, "SMS CP-ACK\n");
break;
case GSM411_MT_CP_ERROR:
DEBUGP(DSMS, "SMS CP-ERROR, cause 0x%02x\n", gh->data[0]);
break;
default:
DEBUGP(DSMS, "Unimplemented CP msg_type: 0x%02x\n", msg_type);
break;
}
return rc;
}
|
