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Parse sms-submit messages

This commit is contained in:
Daniel Willmann 2008-12-29 00:44:41 +00:00
parent 6f4b753000
commit e0fbec823b
3 changed files with 88 additions and 4 deletions
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22
include/openbsc/gsm_04_11.h
View File

@ -22,12 +22,30 @@
/* Chapter 8.1.1 */
struct gsm411_rp_data_hdr {
u_int8_t len;
u_int8_t msg_type;
u_int8_t len;
u_int8_t msg_type;
u_int8_t msg_ref;
u_int8_t data[0];
} __attribute__ ((packed));
/* SMS submit PDU */
struct sms_submit {
u_int8_t *smsc;
u_int8_t mti:2;
u_int8_t mms:1;
u_int8_t vpf:2;
u_int8_t sri:1;
u_int8_t udhi:1;
u_int8_t rp:1;
u_int8_t msg_ref;
u_int8_t *dest_addr;
u_int8_t pid;
u_int8_t dcs;
u_int8_t vp;
u_int8_t ud_len;
u_int8_t *user_data;
};
struct msgb;
int gsm0411_rcv_sms(struct msgb *msg);

2
include/openbsc/msgb.h
View File

@ -36,6 +36,7 @@ struct msgb {
unsigned char *l2h;
unsigned char *l3h;
unsigned char *smsh;
u_int16_t data_len;
u_int16_t len;
@ -53,6 +54,7 @@ extern struct msgb *msgb_dequeue(struct llist_head *queue);
#define msgb_l2(m) ((void *)(m->l2h))
#define msgb_l3(m) ((void *)(m->l3h))
#define msgb_sms(m) ((void *)(m->smsh))
static inline unsigned int msgb_headlen(const struct msgb *msgb)
{

68
src/gsm_04_11.c
View File

@ -35,6 +35,68 @@
#include <openbsc/gsm_04_08.h>
#include <openbsc/abis_rsl.h>
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_cp_data(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
@ -45,8 +107,10 @@ static int gsm411_cp_data(struct msgb *msg)
switch (msg_type) {
case GSM411_MT_RP_DATA_MO:
DEBUGP(DSMS, "SMS RP-DATA (MO)\n");
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);
break;
default:
DEBUGP(DSMS, "Unimplemented RP type 0x%02x\n", msg_type);