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q931.c: Fix subaddress finding octet 4.

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Some switches have extended subaddress ie octet 3 encoding to be
multi-octet.

* Update dump and receive helper functions to search for the end of octet
3 encoding to determine where octet 4 starts.

ASTERISK-27342

Change-Id: I5b2706f668e1a4664b020a58de41dad4cbc5c7e6
This commit is contained in:
bbabic 2017-10-23 10:59:59 +02:00 committed by Richard Mudgett
parent c038af7892
commit a7a2245b12
1 changed files with 32 additions and 7 deletions
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35
q931.c
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@ -2196,17 +2196,33 @@ static int transmit_subaddr_helper(int full_ie, struct pri *ctrl, struct q931_pa
static int receive_subaddr_helper(int full_ie, struct pri *ctrl, struct q931_party_subaddress *q931_subaddress, int msgtype, q931_ie *ie, int offset, int len)
{
int i = -1;
if (len <= 0) {
return -1;
}
q931_subaddress->valid = 1;
q931_subaddress->length = len;
/*
* To follow Q.931 (4.5.1), we must search for start of octet 4 by
* walking through all bytes until one with ext bit (8) set to 1
*/
do {
++i;
switch (i) {
case 0: /* Octet 3 */
/* type: 0 = NSAP, 2 = User Specified */
q931_subaddress->type = ((ie->data[0] & 0x70) >> 4);
q931_subaddress->odd_even_indicator = (ie->data[0] & 0x08) ? 1 : 0;
break;
default: /* Octet 3* extra */
break;
}
} while (!(ie->data[i] & 0x80) && len - i);
q931_subaddress->valid = 1;
q931_subaddress->length = len - i;
q931_memget(q931_subaddress->data, sizeof(q931_subaddress->data),
ie->data + offset, len);
ie->data + offset + i, len - i);
return 0;
}
@ -2214,13 +2230,22 @@ static int receive_subaddr_helper(int full_ie, struct pri *ctrl, struct q931_par
static void dump_subaddr_helper(int full_ie, struct pri *ctrl, q931_ie *ie, int offset, int len, int datalen, char prefix)
{
unsigned char cnum[256];
int i = -1;
/*
* To follow Q.931 (4.5.1), we must search for start of octet 4 by
* walking through all bytes until one with ext bit (8) set to 1
*/
do {
++i;
} while (!(ie->data[i] & 0x80) && datalen - i);
if (!(ie->data[0] & 0x70)) {
/* NSAP Get it as a string for dump display purposes only. */
q931_strget(cnum, sizeof(cnum), ie->data + offset, datalen);
q931_strget(cnum, sizeof(cnum), ie->data + offset + i, datalen - i);
} else {
/* User Specified */
q931_get_subaddr_specific(cnum, sizeof(cnum), ie->data + offset, datalen,
q931_get_subaddr_specific(cnum, sizeof(cnum), ie->data + offset + i, datalen - i,
ie->data[0] & 0x08);
}