ie.c

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/*
 * Chan_Misdn -- Channel Driver for Asterisk
 *
 * Interface to mISDN
 *
 * Copyright (C) 2005, Christian Richter
 *
 * Christian Richter <[email protected]>
 *
 * heaviliy patched from jollys ie.cpp, jolly gave me ALL
 * rights for this code, i can even have my own copyright on it.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

/*! \file
 * \brief Interface to mISDN
 * \author Christian Richter <[email protected]>
 */

/*
 the pointer of enc_ie_* always points to the IE itself
 if qi is not NULL (TE-mode), offset is set
*/

/*** MODULEINFO
 <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include <string.h>

#include <mISDNuser/mISDNlib.h>
#include <mISDNuser/isdn_net.h>
#include <mISDNuser/l3dss1.h>
#include <mISDNuser/net_l3.h>
#include "asterisk/localtime.h"



#define MISDN_IE_DEBG 0

/* support stuff */
static void strnncpy(char *dest, const char *src, size_t len, size_t dst_len)
{
 if (len > dst_len-1)
 len = dst_len-1;
 strncpy(dest, src, len);
 dest[len] = '\0';
}


/* IE_COMPLETE */
static void enc_ie_complete(unsigned char **ntmode, msg_t *msg, int complete, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);

 if (complete<0 || complete>1)
 {
 printf("%s: ERROR: complete(%d) is out of range.\n", __FUNCTION__, complete);
 return;
 }

 if (complete)
 if (MISDN_IE_DEBG) printf(" complete=%d\n", complete);

 if (complete)
 {
 p = msg_put(msg, 1);
 if (nt)
 {
 *ntmode = p;
 } else
 qi->QI_ELEMENT(sending_complete) = p - (unsigned char *)qi - sizeof(Q931_info_t);

 p[0] = IE_COMPLETE;
 }
}

static void dec_ie_complete(unsigned char *p, Q931_info_t *qi, int *complete, int nt, struct misdn_bchannel *bc)
{
 *complete = 0;
 if (!nt)
 {
 if (qi->QI_ELEMENT(sending_complete))
 *complete = 1;
 } else
 if (p)
 *complete = 1;

 if (*complete)
 if (MISDN_IE_DEBG) printf(" complete=%d\n", *complete);
}


/* IE_BEARER */
static void enc_ie_bearer(unsigned char **ntmode, msg_t *msg, int coding, int capability, int mode, int rate, int multi, int user, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (coding<0 || coding>3)
 {
 printf("%s: ERROR: coding(%d) is out of range.\n", __FUNCTION__, coding);
 return;
 }
 if (capability<0 || capability>31)
 {
 printf("%s: ERROR: capability(%d) is out of range.\n", __FUNCTION__, capability);
 return;
 }
 if (mode<0 || mode>3)
 {
 printf("%s: ERROR: mode(%d) is out of range.\n", __FUNCTION__, mode);
 return;
 }
 if (rate<0 || rate>31)
 {
 printf("%s: ERROR: rate(%d) is out of range.\n", __FUNCTION__, rate);
 return;
 }
 if (multi>127)
 {
 printf("%s: ERROR: multi(%d) is out of range.\n", __FUNCTION__, multi);
 return;
 }
 if (user>31)
 {
 printf("%s: ERROR: user L1(%d) is out of range.\n", __FUNCTION__, rate);
 return;
 }
 if (rate!=24 && multi>=0)
 {
 printf("%s: WARNING: multi(%d) is only possible if rate(%d) would be 24.\n", __FUNCTION__, multi, rate);
 multi = -1;
 }

 if (MISDN_IE_DEBG) printf(" coding=%d capability=%d mode=%d rate=%d multi=%d user=%d\n", coding, capability, mode, rate, multi, user);

 l = 2 + (multi>=0) + (user>=0);
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(bearer_capability) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_BEARER;
 p[1] = l;
 p[2] = 0x80 + (coding<<5) + capability;
 p[3] = 0x80 + (mode<<5) + rate;
 if (multi >= 0)
 p[4] = 0x80 + multi;
 if (user >= 0)
 p[4+(multi>=0)] = 0xa0 + user;
}

static void dec_ie_bearer(unsigned char *p, Q931_info_t *qi, int *coding, int *capability, int *mode, int *rate, int *multi, int *user,
 int *async, int *urate, int *stopbits, int *dbits, int *parity, int nt, struct misdn_bchannel *bc)
{
 int octet;
 *coding = -1;
 *capability = -1;
 *mode = -1;
 *rate = -1;
 *multi = -1;
 *user = -1;
 *async = -1;
 *urate = -1;
 *stopbits = -1;
 *dbits = -1;
 *parity = -1;

 if (!nt)
 {
 p = NULL;
#ifdef LLC_SUPPORT
 if (qi->QI_ELEMENT(llc)) {

 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(llc) + 1;
 }
#endif
 if (qi->QI_ELEMENT(bearer_capability))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(bearer_capability) + 1;
 }
 if (!p)
 return;

 if (p[0] < 2)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *coding = (p[1]&0x60) >> 5;
 *capability = p[1] & 0x1f;
 octet = 2;
 if (!(p[1] & 0x80))
 octet++;

 if (p[0] < octet)
 goto done;

 *mode = (p[octet]&0x60) >> 5;
 *rate = p[octet] & 0x1f;

 octet++;

 if (p[0] < octet)
 goto done;

 if (*rate == 0x18) {
 /* Rate multiplier only present if 64Kb/s base rate */
 *multi = p[octet++] & 0x7f;
 }

 if (p[0] < octet)
 goto done;

 /* Start L1 info */
 if ((p[octet] & 0x60) == 0x20) {
 *user = p[octet] & 0x1f;

 if (p[0] <= octet)
 goto done;

 if (p[octet++] & 0x80)
 goto l2;

 *async = !!(p[octet] & 0x40);
 /* 0x20 is inband negotiation */
 *urate = p[octet] & 0x1f;

 if (p[0] <= octet)
 goto done;

 if (p[octet++] & 0x80)
 goto l2;

 /* Ignore next byte for now: Intermediate rate, NIC, flow control */

 if (p[0] <= octet)
 goto done;

 if (p[octet++] & 0x80)
 goto l2;

 /* And the next one. Header, multiframe, mode, assignor/ee, negotiation */

 if (p[0] <= octet)
 goto done;

 if (~p[octet++] & 0x80)
 goto l2;

 /* Wheee. V.110 speed information */

 *stopbits = (p[octet] & 0x60) >> 5;
 *dbits = (p[octet] & 0x18) >> 3;
 *parity = p[octet] & 7;

 octet++;
 }
 l2: /* Nobody seems to want the rest so we don't bother (yet) */
 done:
 if (MISDN_IE_DEBG) printf(" coding=%d capability=%d mode=%d rate=%d multi=%d user=%d async=%d urate=%d stopbits=%d dbits=%d parity=%d\n", *coding, *capability, *mode, *rate, *multi, *user, *async, *urate, *stopbits, *dbits, *parity);
}


/* IE_CALL_ID */
#if 0
static void enc_ie_call_id(unsigned char **ntmode, msg_t *msg, char *callid, int callid_len, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 char debug[25];
 int i;

 if (!callid || callid_len<=0)
 {
 return;
 }
 if (callid_len>8)
 {
 printf("%s: ERROR: callid_len(%d) is out of range.\n", __FUNCTION__, callid_len);
 return;
 }

 i = 0;
 while(i < callid_len)
 {
 if (MISDN_IE_DEBG) printf(debug+(i*3), " %02hhx", (unsigned char)callid[i]);
 i++;
 }

 if (MISDN_IE_DEBG) printf(" callid%s\n", debug);

 l = callid_len;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(call_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CALL_ID;
 p[1] = l;
 memcpy(p+2, callid, callid_len);
}
#endif

#if 0
static void dec_ie_call_id(unsigned char *p, Q931_info_t *qi, char *callid, int *callid_len, int nt, struct misdn_bchannel *bc)
{
 char debug[25];
 int i;

 *callid_len = -1;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(call_id))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(call_id) + 1;
 }
 if (!p)
 return;
 if (p[0] > 8)
 {
 printf("%s: ERROR: IE too long (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *callid_len = p[0];
 memcpy(callid, p+1, *callid_len);

 i = 0;
 while(i < *callid_len)
 {
 if (MISDN_IE_DEBG) printf(debug+(i*3), " %02hhx", (unsigned char)callid[i]);
 i++;
 }

 if (MISDN_IE_DEBG) printf(" callid%s\n", debug);
}
#endif

/* IE_CALLED_PN */
static void enc_ie_called_pn(unsigned char **ntmode, msg_t *msg, int type, int plan, char *number, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (type<0 || type>7)
 {
 printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
 return;
 }
 if (plan<0 || plan>15)
 {
 printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
 return;
 }
 if (!number[0])
 {
 printf("%s: ERROR: number is not given.\n", __FUNCTION__);
 return;
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d number='%s'\n", type, plan, number);

 l = 1+strlen((char *)number);
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(called_nr) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CALLED_PN;
 p[1] = l;
 p[2] = 0x80 + (type<<4) + plan;
 strncpy((char *)p+3, (char *)number, strlen((char *)number));
}

static void dec_ie_called_pn(unsigned char *p, Q931_info_t *qi, int *type, int *plan, char *number, size_t number_len, int nt, struct misdn_bchannel *bc)
{
 *type = -1;
 *plan = -1;
 *number = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(called_nr))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(called_nr) + 1;
 }
 if (!p)
 return;
 if (p[0] < 2)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *type = (p[1]&0x70) >> 4;
 *plan = p[1] & 0xf;
 strnncpy(number, (char *)p+2, p[0]-1, number_len);

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d number='%s'\n", *type, *plan, number);
}


/* IE_CALLING_PN */
static void enc_ie_calling_pn(unsigned char **ntmode, msg_t *msg, int type, int plan, int present, int screen, char *number, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (type<0 || type>7)
 {
 printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
 return;
 }
 if (plan<0 || plan>15)
 {
 printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
 return;
 }
 if (present>3)
 {
 printf("%s: ERROR: present(%d) is out of range.\n", __FUNCTION__, present);
 return;
 }
 if (present >= 0) if (screen<0 || screen>3)
 {
 printf("%s: ERROR: screen(%d) is out of range.\n", __FUNCTION__, screen);
 return;
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d number='%s'\n", type, plan, present, screen, number);

 l = 1;
 if (number) if (number[0])
 l += strlen((char *)number);
 if (present >= 0)
 l += 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(calling_nr) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CALLING_PN;
 p[1] = l;
 if (present >= 0)
 {
 p[2] = 0x00 + (type<<4) + plan;
 p[3] = 0x80 + (present<<5) + screen;
 if (number) if (number[0])
 strncpy((char *)p+4, (char *)number, strlen((char *)number));
 } else
 {
 p[2] = 0x80 + (type<<4) + plan;
 if (number) if (number[0])
 strncpy((char *)p+3, (char *)number, strlen((char *)number));
 }
}

static void dec_ie_calling_pn(unsigned char *p, Q931_info_t *qi, int *type, int *plan, int *present, int *screen, char *number, size_t number_len, int nt, struct misdn_bchannel *bc)
{
 *type = -1;
 *plan = -1;
 *present = -1;
 *screen = -1;
 *number = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(calling_nr))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(calling_nr) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *type = (p[1]&0x70) >> 4;
 *plan = p[1] & 0xf;
 if (!(p[1] & 0x80))
 {
 if (p[0] < 2)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }
 *present = (p[2]&0x60) >> 5;
 *screen = p[2] & 0x3;
 strnncpy(number, (char *)p+3, p[0]-2, number_len);
 } else
 {
 strnncpy(number, (char *)p+2, p[0]-1, number_len);
 /* SPECIAL workarround for IBT software bug */
 /* if (number[0]==0x80) */
 /* strcpy((char *)number, (char *)number+1); */
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d number='%s'\n", *type, *plan, *present, *screen, number);
}


/* IE_CONNECTED_PN */
static void enc_ie_connected_pn(unsigned char **ntmode, msg_t *msg, int type, int plan, int present, int screen, char *number, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (type<0 || type>7)
 {
 printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
 return;
 }
 if (plan<0 || plan>15)
 {
 printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
 return;
 }
 if (present>3)
 {
 printf("%s: ERROR: present(%d) is out of range.\n", __FUNCTION__, present);
 return;
 }
 if (present >= 0) if (screen<0 || screen>3)
 {
 printf("%s: ERROR: screen(%d) is out of range.\n", __FUNCTION__, screen);
 return;
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d number='%s'\n", type, plan, present, screen, number);

 l = 1;
 if (number) if (number[0])
 l += strlen((char *)number);
 if (present >= 0)
 l += 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(connected_nr) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CONNECT_PN;
 p[1] = l;
 if (present >= 0)
 {
 p[2] = 0x00 + (type<<4) + plan;
 p[3] = 0x80 + (present<<5) + screen;
 if (number) if (number[0])
 strncpy((char *)p+4, (char *)number, strlen((char *)number));
 } else
 {
 p[2] = 0x80 + (type<<4) + plan;
 if (number) if (number[0])
 strncpy((char *)p+3, (char *)number, strlen((char *)number));
 }
}

static void dec_ie_connected_pn(unsigned char *p, Q931_info_t *qi, int *type, int *plan, int *present, int *screen, char *number, size_t number_len, int nt, struct misdn_bchannel *bc)
{
 *type = -1;
 *plan = -1;
 *present = -1;
 *screen = -1;
 *number = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(connected_nr))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(connected_nr) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *type = (p[1]&0x70) >> 4;
 *plan = p[1] & 0xf;
 if (!(p[1] & 0x80))
 {
 if (p[0] < 2)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }
 *present = (p[2]&0x60) >> 5;
 *screen = p[2] & 0x3;
 strnncpy(number, (char *)p+3, p[0]-2, number_len);
 } else
 {
 strnncpy(number, (char *)p+2, p[0]-1, number_len);
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d number='%s'\n", *type, *plan, *present, *screen, number);
}


/* IE_CAUSE */
static void enc_ie_cause(unsigned char **ntmode, msg_t *msg, int location, int cause, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (location<0 || location>7)
 {
 printf("%s: ERROR: location(%d) is out of range.\n", __FUNCTION__, location);
 return;
 }
 if (cause<0 || cause>127)
 {
 printf("%s: ERROR: cause(%d) is out of range.\n", __FUNCTION__, cause);
 return;
 }

 if (MISDN_IE_DEBG) printf(" location=%d cause=%d\n", location, cause);

 l = 2;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(cause) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CAUSE;
 p[1] = l;
 p[2] = 0x80 + location;
 p[3] = 0x80 + cause;
}

#if 0
static void enc_ie_cause_standalone(unsigned char **ntmode, msg_t *msg, int location, int cause, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p = msg_put(msg, 4);
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 if (ntmode)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(cause) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CAUSE;
 p[1] = 2;
 p[2] = 0x80 + location;
 p[3] = 0x80 + cause;
}
#endif

static void dec_ie_cause(unsigned char *p, Q931_info_t *qi, int *location, int *cause, int nt, struct misdn_bchannel *bc)
{
 *location = -1;
 *cause = -1;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(cause))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(cause) + 1;
 }
 if (!p)
 return;
 if (p[0] < 2)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *location = p[1] & 0x0f;
 *cause = p[2] & 0x7f;

 if (MISDN_IE_DEBG) printf(" location=%d cause=%d\n", *location, *cause);
}


/* IE_CHANNEL_ID */
static void enc_ie_channel_id(unsigned char **ntmode, msg_t *msg, int exclusive, int channel, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;
 struct misdn_stack *stack=get_stack_by_bc(bc);
 int pri = stack->pri;

 if (exclusive<0 || exclusive>1)
 {
 printf("%s: ERROR: exclusive(%d) is out of range.\n", __FUNCTION__, exclusive);
 return;
 }
 if ((channel<0 || channel>0xff)
 || (!pri && (channel>2 && channel<0xff))
 || (pri && (channel>31 && channel<0xff))
 || (pri && channel==16))
 {
 printf("%s: ERROR: channel(%d) is out of range.\n", __FUNCTION__, channel);
 return;
 }

 /* if (MISDN_IE_DEBG) printf(" exclusive=%d channel=%d\n", exclusive, channel); */


 if (!pri)
 {
 /* BRI */
 l = 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CHANNEL_ID;
 p[1] = l;
 if (channel == 0xff)
 channel = 3;
 p[2] = 0x80 + (exclusive<<3) + channel;
 /* printf(" exclusive=%d channel=%d\n", exclusive, channel); */
 } else
 {
 /* PRI */
 if (channel == 0) /* no channel */
 return; /* IE not present */
/* if (MISDN_IE_DEBG) printf("channel = %d\n", channel); */
 if (channel == 0xff) /* any channel */
 {
 l = 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CHANNEL_ID;
 p[1] = l;
 p[2] = 0x80 + 0x20 + 0x03;
/* if (MISDN_IE_DEBG) printf("%02hhx\n", p[2]); */
 return; /* end */
 }
 l = 3;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_CHANNEL_ID;
 p[1] = l;
 p[2] = 0x80 + 0x20 + (exclusive<<3) + 0x01;
 p[3] = 0x80 + 3; /* CCITT, Number, B-type */
 p[4] = 0x80 + channel;
/* if (MISDN_IE_DEBG) printf("%02hhx %02hhx %02hhx\n", p[2], p[3], p[4]); */
 }
}

static void dec_ie_channel_id(unsigned char *p, Q931_info_t *qi, int *exclusive, int *channel, int nt, struct misdn_bchannel *bc)
{
 struct misdn_stack *stack=get_stack_by_bc(bc);
 int pri =stack->pri;

 *exclusive = -1;
 *channel = -1;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(channel_id))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(channel_id) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 if (p[1] & 0x40)
 {
 printf("%s: ERROR: refering to channels of other interfaces is not supported.\n", __FUNCTION__);
 return;
 }
 if (p[1] & 0x04)
 {
 printf("%s: ERROR: using d-channel is not supported.\n", __FUNCTION__);
 return;
 }

 *exclusive = (p[1]&0x08) >> 3;
 if (!pri)
 {
 /* BRI */
 if (p[1] & 0x20)
 {
 printf("%s: ERROR: extended channel ID with non PRI interface.\n", __FUNCTION__);
 return;
 }
 *channel = p[1] & 0x03;
 if (*channel == 3)
 *channel = 0xff;
 } else
 {
 /* PRI */
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short for PRI (%d).\n", __FUNCTION__, p[0]);
 return;
 }
 if (!(p[1] & 0x20))
 {
 printf("%s: ERROR: basic channel ID with PRI interface.\n", __FUNCTION__);
 return;
 }
 if ((p[1]&0x03) == 0x00)
 {
 /* no channel */
 *channel = 0;
 return;
 }
 if ((p[1]&0x03) == 0x03)
 {
 /* any channel */
 *channel = 0xff;
 return;
 }
 if (p[0] < 3)
 {
 printf("%s: ERROR: IE too short for PRI with channel(%d).\n", __FUNCTION__, p[0]);
 return;
 }
 if (p[2] & 0x10)
 {
 printf("%s: ERROR: channel map not supported.\n", __FUNCTION__);
 return;
 }
 *channel = p[3] & 0x7f;
 if ( (*channel<1) | (*channel==16) | (*channel>31))
 {
 printf("%s: ERROR: PRI interface channel out of range (%d).\n", __FUNCTION__, *channel);
 return;
 }
/* if (MISDN_IE_DEBG) printf("%02hhx %02hhx %02hhx\n", p[1], p[2], p[3]); */
 }

 if (MISDN_IE_DEBG) printf(" exclusive=%d channel=%d\n", *exclusive, *channel);
}


/* IE_DATE */
static void enc_ie_date(unsigned char **ntmode, msg_t *msg, time_t ti, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;
 struct timeval tv = { ti, 0 };
 struct ast_tm tm;

 ast_localtime(&tv, &tm, NULL);
 if (MISDN_IE_DEBG) printf(" year=%d month=%d day=%d hour=%d minute=%d\n", tm.tm_year%100, tm.tm_mon+1, tm.tm_mday, tm.tm_hour, tm.tm_min);

 l = 5;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(date) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_DATE;
 p[1] = l;
 p[2] = tm.tm_year % 100;
 p[3] = tm.tm_mon + 1;
 p[4] = tm.tm_mday;
 p[5] = tm.tm_hour;
 p[6] = tm.tm_min;
}


/* IE_DISPLAY */
static void enc_ie_display(unsigned char **ntmode, msg_t *msg, char *display, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *) (msg->data + mISDN_HEADER_LEN);
 int l;

 if (!display[0])
 {
 printf("%s: ERROR: display text not given.\n", __FUNCTION__);
 return;
 }

 l = strlen(display);
 if (80 < l)
 {
 l = 80;
 printf("%s: WARNING: display text too long (max %d chars), cutting.\n", __FUNCTION__, l);
 display[l] = '\0';
 }

 /* if (MISDN_IE_DEBG) printf(" display='%s' (len=%d)\n", display, l); */

 p = msg_put(msg, l + 2);
 if (nt)
 *ntmode = p + 1;
 else
 qi->QI_ELEMENT(display) = p - (unsigned char *) qi - sizeof(Q931_info_t);
 p[0] = IE_DISPLAY;
 p[1] = l;
 strncpy((char *) p + 2, display, l);
}

#if 0
static void dec_ie_display(unsigned char *p, Q931_info_t *qi, char *display, size_t display_len, int nt, struct misdn_bchannel *bc)
{
 *display = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(display))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(display) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 strnncpy(display, (char *)p+1, p[0], display_len);

 if (MISDN_IE_DEBG) printf(" display='%s'\n", display);
}
#endif

/* IE_KEYPAD */
#if 1
static void enc_ie_keypad(unsigned char **ntmode, msg_t *msg, char *keypad, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (!keypad[0])
 {
 printf("%s: ERROR: keypad info not given.\n", __FUNCTION__);
 return;
 }

 if (MISDN_IE_DEBG) printf(" keypad='%s'\n", keypad);

 l = strlen(keypad);
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(keypad) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_KEYPAD;
 p[1] = l;
 strncpy((char *)p+2, keypad, strlen(keypad));
}
#endif

static void dec_ie_keypad(unsigned char *p, Q931_info_t *qi, char *keypad, size_t keypad_len, int nt, struct misdn_bchannel *bc)
{
 *keypad = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(keypad))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(keypad) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 strnncpy(keypad, (char *)p+1, p[0], keypad_len);

 if (MISDN_IE_DEBG) printf(" keypad='%s'\n", keypad);
}


/* IE_NOTIFY */
static void enc_ie_notify(unsigned char **ntmode, msg_t *msg, int notify, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (notify<0 || notify>0x7f)
 {
 printf("%s: ERROR: notify(%d) is out of range.\n", __FUNCTION__, notify);
 return;
 }

 if (MISDN_IE_DEBG) printf(" notify=%d\n", notify);

 l = 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(notify) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_NOTIFY;
 p[1] = l;
 p[2] = 0x80 + notify;
}

static void dec_ie_notify(unsigned char *p, Q931_info_t *qi, int *notify, int nt, struct misdn_bchannel *bc)
{
 *notify = -1;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(notify))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(notify) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *notify = p[1] & 0x7f;

 if (MISDN_IE_DEBG) printf(" notify=%d\n", *notify);
}


/* IE_PROGRESS */
static void enc_ie_progress(unsigned char **ntmode, msg_t *msg, int coding, int location, int progress, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (coding<0 || coding>0x03)
 {
 printf("%s: ERROR: coding(%d) is out of range.\n", __FUNCTION__, coding);
 return;
 }
 if (location<0 || location>0x0f)
 {
 printf("%s: ERROR: location(%d) is out of range.\n", __FUNCTION__, location);
 return;
 }
 if (progress<0 || progress>0x7f)
 {
 printf("%s: ERROR: progress(%d) is out of range.\n", __FUNCTION__, progress);
 return;
 }

 if (MISDN_IE_DEBG) printf(" coding=%d location=%d progress=%d\n", coding, location, progress);

 l = 2;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(progress) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_PROGRESS;
 p[1] = l;
 p[2] = 0x80 + (coding<<5) + location;
 p[3] = 0x80 + progress;
}

static void dec_ie_progress(unsigned char *p, Q931_info_t *qi, int *coding, int *location, int *progress, int nt, struct misdn_bchannel *bc)
{
 *coding = -1;
 *location = -1;
 //*progress = -1;
 *progress = 0;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(progress))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(progress) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *coding = (p[1]&0x60) >> 5;
 *location = p[1] & 0x0f;
 *progress = p[2] & 0x7f;

 if (MISDN_IE_DEBG) printf(" coding=%d location=%d progress=%d\n", *coding, *location, *progress);
}


/* IE_REDIR_NR (redirecting = during MT_SETUP) */
static void enc_ie_redir_nr(unsigned char **ntmode, msg_t *msg, int type, int plan, int present, int screen, int reason, char *number, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (type<0 || type>7)
 {
 printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
 return;
 }
 if (plan<0 || plan>15)
 {
 printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
 return;
 }
 if (present > 3)
 {
 printf("%s: ERROR: present(%d) is out of range.\n", __FUNCTION__, present);
 return;
 }
 if (present >= 0) if (screen<0 || screen>3)
 {
 printf("%s: ERROR: screen(%d) is out of range.\n", __FUNCTION__, screen);
 return;
 }
 if (reason > 0x0f)
 {
 printf("%s: ERROR: reason(%d) is out of range.\n", __FUNCTION__, reason);
 return;
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d readon=%d number='%s'\n", type, plan, present, screen, reason, number);

 l = 1;
 if (number)
 l += strlen((char *)number);
 if (present >= 0)
 {
 l += 1;
 if (reason >= 0)
 l += 1;
 }
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(redirect_nr) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_REDIR_NR;
 p[1] = l;
 if (present >= 0)
 {
 if (reason >= 0)
 {
 p[2] = 0x00 + (type<<4) + plan;
 p[3] = 0x00 + (present<<5) + screen;
 p[4] = 0x80 + reason;
 if (number)
 strncpy((char *)p+5, (char *)number, strlen((char *)number));
 } else
 {
 p[2] = 0x00 + (type<<4) + plan;
 p[3] = 0x80 + (present<<5) + screen;
 if (number)
 strncpy((char *)p+4, (char *)number, strlen((char *)number));
 }
 } else
 {
 p[2] = 0x80 + (type<<4) + plan;
 if (number) if (number[0])
 strncpy((char *)p+3, (char *)number, strlen((char *)number));
 }
}

static void dec_ie_redir_nr(unsigned char *p, Q931_info_t *qi, int *type, int *plan, int *present, int *screen, int *reason, char *number, size_t number_len, int nt, struct misdn_bchannel *bc)
{
 *type = -1;
 *plan = -1;
 *present = -1;
 *screen = -1;
 *reason = -1;
 *number = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(redirect_nr))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(redirect_nr) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *type = (p[1]&0x70) >> 4;
 *plan = p[1] & 0xf;
 if (!(p[1] & 0x80))
 {
 *present = (p[2]&0x60) >> 5;
 *screen = p[2] & 0x3;
 if (!(p[2] & 0x80))
 {
 *reason = p[3] & 0x0f;
 strnncpy(number, (char *)p+4, p[0]-3, number_len);
 } else
 {
 strnncpy(number, (char *)p+3, p[0]-2, number_len);
 }
 } else
 {
 strnncpy(number, (char *)p+2, p[0]-1, number_len);
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d screen=%d reason=%d number='%s'\n", *type, *plan, *present, *screen, *reason, number);
}


/* IE_REDIR_DN (redirection = during MT_NOTIFY) */
static void enc_ie_redir_dn(unsigned char **ntmode, msg_t *msg, int type, int plan, int present, char *number, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (type<0 || type>7)
 {
 printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
 return;
 }
 if (plan<0 || plan>15)
 {
 printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
 return;
 }
 if (present > 3)
 {
 printf("%s: ERROR: present(%d) is out of range.\n", __FUNCTION__, present);
 return;
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d number='%s'\n", type, plan, present, number);

 l = 1;
 if (number)
 l += strlen((char *)number);
 if (present >= 0)
 l += 1;
 p = msg_put(msg, l+2);
 if (nt)
 *ntmode = p+1;
 else {
 qi->QI_ELEMENT(redirect_dn) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 }
 p[0] = IE_REDIR_DN;
 p[1] = l;
 if (present >= 0)
 {
 p[2] = 0x00 + (type<<4) + plan;
 p[3] = 0x80 + (present<<5);
 if (number)
 strncpy((char *)p+4, (char *)number, strlen((char *)number));
 } else
 {
 p[2] = 0x80 + (type<<4) + plan;
 if (number)
 strncpy((char *)p+3, (char *)number, strlen((char *)number));
 }
}

static void dec_ie_redir_dn(unsigned char *p, Q931_info_t *qi, int *type, int *plan, int *present, char *number, size_t number_len, int nt, struct misdn_bchannel *bc)
{
 *type = -1;
 *plan = -1;
 *present = -1;
 *number = '\0';

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(redirect_dn))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(redirect_dn) + 1;
 }
 if (!p)
 return;
 if (p[0] < 1)
 {
 printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
 return;
 }

 *type = (p[1]&0x70) >> 4;
 *plan = p[1] & 0xf;
 if (!(p[1] & 0x80))
 {
 *present = (p[2]&0x60) >> 5;
 strnncpy(number, (char *)p+3, p[0]-2, number_len);
 } else
 {
 strnncpy(number, (char *)p+2, p[0]-1, number_len);
 }

 if (MISDN_IE_DEBG) printf(" type=%d plan=%d present=%d number='%s'\n", *type, *plan, *present, number);
}


/* IE_USERUSER */
#if 1
static void enc_ie_useruser(unsigned char **ntmode, msg_t *msg, int protocol, char *user, int user_len, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 int l;

 if (protocol<0 || protocol>127)
 {
 printf("%s: ERROR: protocol(%d) is out of range.\n", __FUNCTION__, protocol);
 return;
 }
 if (!user || user_len<=0)
 {
 return;
 }

 if (MISDN_IE_DEBG) {
 size_t i;
 char debug[768];

 for (i = 0; i < user_len; ++i) {
 sprintf(debug + (i * 3), " %02hhx", (unsigned char)user[i]);
 }
 debug[i * 3] = 0;
 printf(" protocol=%d user-user%s\n", protocol, debug);
 }

 l = user_len+1;
 p = msg_put(msg, l+3);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(useruser) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_USER_USER;
 p[1] = l;
 p[2] = protocol;
 memcpy(p+3, user, user_len);
}
#endif

#if 1
static void dec_ie_useruser(unsigned char *p, Q931_info_t *qi, int *protocol, char *user, int *user_len, int nt, struct misdn_bchannel *bc)
{
 *user_len = 0;
 *protocol = -1;

 if (!nt)
 {
 p = NULL;
 if (qi->QI_ELEMENT(useruser))
 p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(useruser) + 1;
 }
 if (!p)
 return;

 *user_len = p[0]-1;
 if (p[0] < 1)
 return;
 *protocol = p[1];
 memcpy(user, p+2, (*user_len<=128)?*(user_len):128); /* clip to 128 maximum */

 if (MISDN_IE_DEBG) {
 int i;
 char debug[768];

 for (i = 0; i < *user_len; ++i) {
 sprintf(debug + (i * 3), " %02hhx", (unsigned char)user[i]);
 }
 debug[i * 3] = 0;
 printf(" protocol=%d user-user%s\n", *protocol, debug);
 }
}
#endif

/* IE_DISPLAY */
static void enc_ie_restart_ind(unsigned char **ntmode, msg_t *msg, unsigned char rind, int nt, struct misdn_bchannel *bc)
{
 unsigned char *p;
 Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
 /* if (MISDN_IE_DEBG) printf(" display='%s' (len=%d)\n", display, strlen((char *)display)); */

 p = msg_put(msg, 3);
 if (nt)
 *ntmode = p+1;
 else
 qi->QI_ELEMENT(restart_ind) = p - (unsigned char *)qi - sizeof(Q931_info_t);
 p[0] = IE_RESTART_IND;
 p[1] = 1;
 p[2] = rind;

}