/* $Id: q931.c,v 1.12.2.3 2004/01/13 14:31:26 keil Exp $
 *
 * code to decode ITU Q.931 call control messages
 *
 * Author       Jan den Ouden
 * Copyright    by Jan den Ouden
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * Changelog:
 *
 * Pauline Middelink    general improvements
 * Beat Doebeli         cause texts, display information element
 * Karsten Keil         cause texts, display information element for 1TR6
 *
 */


#include "hisax.h"
#include "l3_1tr6.h"

void
iecpy(u_char *dest, u_char *iestart, int ieoffset)
{
        u_char *p;
        int l;

        p = iestart + ieoffset + 2;
        l = iestart[1] - ieoffset;
        while (l--)
                *dest++ = *p++;
        *dest++ = '\0';
}

/*
 * According to Table 4-2/Q.931
 */
static
struct MessageType {
        u_char nr;
        char *descr;
} mtlist[] = {

        {
                0x1, "ALERTING"
        },
        {
                0x2, "CALL PROCEEDING"
        },
        {
                0x7, "CONNECT"
        },
        {
                0xf, "CONNECT ACKNOWLEDGE"
        },
        {
                0x3, "PROGRESS"
        },
        {
                0x5, "SETUP"
        },
        {
                0xd, "SETUP ACKNOWLEDGE"
        },
        {
                0x24, "HOLD"
        },
        {
                0x28, "HOLD ACKNOWLEDGE"
        },
        {
                0x30, "HOLD REJECT"
        },
        {
                0x31, "RETRIEVE"
        },
        {
                0x33, "RETRIEVE ACKNOWLEDGE"
        },
        {
                0x37, "RETRIEVE REJECT"
        },
        {
                0x26, "RESUME"
        },
        {
                0x2e, "RESUME ACKNOWLEDGE"
        },
        {
                0x22, "RESUME REJECT"
        },
        {
                0x25, "SUSPEND"
        },
        {
                0x2d, "SUSPEND ACKNOWLEDGE"
        },
        {
                0x21, "SUSPEND REJECT"
        },
        {
                0x20, "USER INFORMATION"
        },
        {
                0x45, "DISCONNECT"
        },
        {
                0x4d, "RELEASE"
        },
        {
                0x5a, "RELEASE COMPLETE"
        },
        {
                0x46, "RESTART"
        },
        {
                0x4e, "RESTART ACKNOWLEDGE"
        },
        {
                0x60, "SEGMENT"
        },
        {
                0x79, "CONGESTION CONTROL"
        },
        {
                0x7b, "INFORMATION"
        },
        {
                0x62, "FACILITY"
        },
        {
                0x6e, "NOTIFY"
        },
        {
                0x7d, "STATUS"
        },
        {
                0x75, "STATUS ENQUIRY"
        }
};

#define MTSIZE ARRAY_SIZE(mtlist)

static
struct MessageType mt_n0[] =
{
        {MT_N0_REG_IND, "REGister INDication"},
        {MT_N0_CANC_IND, "CANCel INDication"},
        {MT_N0_FAC_STA, "FACility STAtus"},
        {MT_N0_STA_ACK, "STAtus ACKnowledge"},
        {MT_N0_STA_REJ, "STAtus REJect"},
        {MT_N0_FAC_INF, "FACility INFormation"},
        {MT_N0_INF_ACK, "INFormation ACKnowledge"},
        {MT_N0_INF_REJ, "INFormation REJect"},
        {MT_N0_CLOSE, "CLOSE"},
        {MT_N0_CLO_ACK, "CLOse ACKnowledge"}
};

#define MT_N0_LEN ARRAY_SIZE(mt_n0)

static
struct MessageType mt_n1[] =
{
        {MT_N1_ESC, "ESCape"},
        {MT_N1_ALERT, "ALERT"},
        {MT_N1_CALL_SENT, "CALL SENT"},
        {MT_N1_CONN, "CONNect"},
        {MT_N1_CONN_ACK, "CONNect ACKnowledge"},
        {MT_N1_SETUP, "SETUP"},
        {MT_N1_SETUP_ACK, "SETUP ACKnowledge"},
        {MT_N1_RES, "RESume"},
        {MT_N1_RES_ACK, "RESume ACKnowledge"},
        {MT_N1_RES_REJ, "RESume REJect"},
        {MT_N1_SUSP, "SUSPend"},
        {MT_N1_SUSP_ACK, "SUSPend ACKnowledge"},
        {MT_N1_SUSP_REJ, "SUSPend REJect"},
        {MT_N1_USER_INFO, "USER INFO"},
        {MT_N1_DET, "DETach"},
        {MT_N1_DISC, "DISConnect"},
        {MT_N1_REL, "RELease"},
        {MT_N1_REL_ACK, "RELease ACKnowledge"},
        {MT_N1_CANC_ACK, "CANCel ACKnowledge"},
        {MT_N1_CANC_REJ, "CANCel REJect"},
        {MT_N1_CON_CON, "CONgestion CONtrol"},
        {MT_N1_FAC, "FACility"},
        {MT_N1_FAC_ACK, "FACility ACKnowledge"},
        {MT_N1_FAC_CAN, "FACility CANcel"},
        {MT_N1_FAC_REG, "FACility REGister"},
        {MT_N1_FAC_REJ, "FACility REJect"},
        {MT_N1_INFO, "INFOrmation"},
        {MT_N1_REG_ACK, "REGister ACKnowledge"},
        {MT_N1_REG_REJ, "REGister REJect"},
        {MT_N1_STAT, "STATus"}
};

#define MT_N1_LEN ARRAY_SIZE(mt_n1)


static int
prbits(char *dest, u_char b, int start, int len)
{
        char *dp = dest;

        b = b << (8 - start);
        while (len--) {
                if (b & 0x80)
                        *dp++ = '1';
                else
                        *dp++ = '0';
                b = b << 1;
        }
        return (dp - dest);
}

static
u_char *
skipext(u_char *p)
{
        while (!(*p++ & 0x80));
        return (p);
}

/*
 * Cause Values According to Q.850
 * edescr: English description
 * ddescr: German description used by Swissnet II (Swiss Telecom
 *         not yet written...
 */

static
struct CauseValue {
        u_char nr;
        char *edescr;
        char *ddescr;
} cvlist[] = {

        {
                0x01, "Unallocated (unassigned) number", "Nummer nicht zugeteilt"
        },
        {
                0x02, "No route to specified transit network", ""
        },
        {
                0x03, "No route to destination", ""
        },
        {
                0x04, "Send special information tone", ""
        },
        {
                0x05, "Misdialled trunk prefix", ""
        },
        {
                0x06, "Channel unacceptable", "Kanal nicht akzeptierbar"
        },
        {
                0x07, "Channel awarded and being delivered in an established channel", ""
        },
        {
                0x08, "Preemption", ""
        },
        {
                0x09, "Preemption - circuit reserved for reuse", ""
        },
        {
                0x10, "Normal call clearing", "Normale Ausloesung"
        },
        {
                0x11, "User busy", "TNB besetzt"
        },
        {
                0x12, "No user responding", ""
        },
        {
                0x13, "No answer from user (user alerted)", ""
        },
        {
                0x14, "Subscriber absent", ""
        },
        {
                0x15, "Call rejected", ""
        },
        {
                0x16, "Number changed", ""
        },
        {
                0x1a, "non-selected user clearing", ""
        },
        {
                0x1b, "Destination out of order", ""
        },
        {
                0x1c, "Invalid number format (address incomplete)", ""
        },
        {
                0x1d, "Facility rejected", ""
        },
        {
                0x1e, "Response to Status enquiry", ""
        },
        {
                0x1f, "Normal, unspecified", ""
        },
        {
                0x22, "No circuit/channel available", ""
        },
        {
                0x26, "Network out of order", ""
        },
        {
                0x27, "Permanent frame mode connection out-of-service", ""
        },
        {
                0x28, "Permanent frame mode connection operational", ""
        },
        {
                0x29, "Temporary failure", ""
        },
        {
                0x2a, "Switching equipment congestion", ""
        },
        {
                0x2b, "Access information discarded", ""
        },
        {
                0x2c, "Requested circuit/channel not available", ""
        },
        {
                0x2e, "Precedence call blocked", ""
        },
        {
                0x2f, "Resource unavailable, unspecified", ""
        },
        {
                0x31, "Quality of service unavailable", ""
        },
        {
                0x32, "Requested facility not subscribed", ""
        },
        {
                0x35, "Outgoing calls barred within CUG", ""
        },
        {
                0x37, "Incoming calls barred within CUG", ""
        },
        {
                0x39, "Bearer capability not authorized", ""
        },
        {
                0x3a, "Bearer capability not presently available", ""
        },
        {
                0x3e, "Inconsistency in designated outgoing access information and subscriber class ", " "
        },
        {
                0x3f, "Service or option not available, unspecified", ""
        },
        {
                0x41, "Bearer capability not implemented", ""
        },
        {
                0x42, "Channel type not implemented", ""
        },
        {
                0x43, "Requested facility not implemented", ""
        },
        {
                0x44, "Only restricted digital information bearer capability is available", ""
        },
        {
                0x4f, "Service or option not implemented", ""
        },
        {
                0x51, "Invalid call reference value", ""
        },
        {
                0x52, "Identified channel does not exist", ""
        },
        {
                0x53, "A suspended call exists, but this call identity does not", ""
        },
        {
                0x54, "Call identity in use", ""
        },
        {
                0x55, "No call suspended", ""
        },
        {
                0x56, "Call having the requested call identity has been cleared", ""
        },
        {
                0x57, "User not member of CUG", ""
        },
        {
                0x58, "Incompatible destination", ""
        },
        {
                0x5a, "Non-existent CUG", ""
        },
        {
                0x5b, "Invalid transit network selection", ""
        },
        {
                0x5f, "Invalid message, unspecified", ""
        },
        {
                0x60, "Mandatory information element is missing", ""
        },
        {
                0x61, "Message type non-existent or not implemented", ""
        },
        {
                0x62, "Message not compatible with call state or message type non-existent or not implemented ", " "
        },
        {
                0x63, "Information element/parameter non-existent or not implemented", ""
        },
        {
                0x64, "Invalid information element contents", ""
        },
        {
                0x65, "Message not compatible with call state", ""
        },
        {
                0x66, "Recovery on timer expiry", ""
        },
        {
                0x67, "Parameter non-existent or not implemented - passed on", ""
        },
        {
                0x6e, "Message with unrecognized parameter discarded", ""
        },
        {
                0x6f, "Protocol error, unspecified", ""
        },
        {
                0x7f, "Interworking, unspecified", ""
        },
};

#define CVSIZE ARRAY_SIZE(cvlist)

static
int
prcause(char *dest, u_char *p)
{
        u_char *end;
        char *dp = dest;
        int i, cause;

        end = p + p[1] + 1;
        p += 2;
        dp += sprintf(dp, "    coding ");
        dp += prbits(dp, *p, 7, 2);
        dp += sprintf(dp, " location ");
        dp += prbits(dp, *p, 4, 4);
        *dp++ = '\n';
        p = skipext(p);

        cause = 0x7f & *p++;

        /* locate cause value */
        for (i = 0; i < CVSIZE; i++)
                if (cvlist[i].nr == cause)
                        break;

        /* display cause value if it exists */
        if (i == CVSIZE)
                dp += sprintf(dp, "Unknown cause type %x!\n", cause);
        else
                dp += sprintf(dp, "  cause value %x : %s \n", cause, cvlist[i].edescr);

        while (!0) {
                if (p > end)
                        break;
                dp += sprintf(dp, "    diag attribute %d ", *p++ & 0x7f);
                dp += sprintf(dp, " rej %d ", *p & 0x7f);
                if (*p & 0x80) {
                        *dp++ = '\n';
                        break;
                } else
                        dp += sprintf(dp, " av %d\n", (*++p) & 0x7f);
        }
        return (dp - dest);

}

static
struct MessageType cause_1tr6[] =
{
        {CAUSE_InvCRef, "Invalid Call Reference"},
        {CAUSE_BearerNotImpl, "Bearer Service Not Implemented"},
        {CAUSE_CIDunknown, "Caller Identity unknown"},
        {CAUSE_CIDinUse, "Caller Identity in Use"},
        {CAUSE_NoChans, "No Channels available"},
        {CAUSE_FacNotImpl, "Facility Not Implemented"},
        {CAUSE_FacNotSubscr, "Facility Not Subscribed"},
        {CAUSE_OutgoingBarred, "Outgoing calls barred"},
        {CAUSE_UserAccessBusy, "User Access Busy"},
        {CAUSE_NegativeGBG, "Negative GBG"},
        {CAUSE_UnknownGBG, "Unknown  GBG"},
        {CAUSE_NoSPVknown, "No SPV known"},
        {CAUSE_DestNotObtain, "Destination not obtainable"},
        {CAUSE_NumberChanged, "Number changed"},
        {CAUSE_OutOfOrder, "Out Of Order"},
        {CAUSE_NoUserResponse, "No User Response"},
        {CAUSE_UserBusy, "User Busy"},
        {CAUSE_IncomingBarred, "Incoming Barred"},
        {CAUSE_CallRejected, "Call Rejected"},
        {CAUSE_NetworkCongestion, "Network Congestion"},
        {CAUSE_RemoteUser, "Remote User initiated"},
        {CAUSE_LocalProcErr, "Local Procedure Error"},
        {CAUSE_RemoteProcErr, "Remote Procedure Error"},
        {CAUSE_RemoteUserSuspend, "Remote User Suspend"},
        {CAUSE_RemoteUserResumed, "Remote User Resumed"},
        {CAUSE_UserInfoDiscarded, "User Info Discarded"}
};

static int cause_1tr6_len = ARRAY_SIZE(cause_1tr6);

static int
prcause_1tr6(char *dest, u_char *p)
{
        char *dp = dest;
        int i, cause;

        p++;
        if (0 == *p) {
                dp += sprintf(dp, "   OK (cause length=0)\n");
                return (dp - dest);
        } else if (*p > 1) {
                dp += sprintf(dp, "    coding ");
                dp += prbits(dp, p[2], 7, 2);
                dp += sprintf(dp, " location ");
                dp += prbits(dp, p[2], 4, 4);
                *dp++ = '\n';
        }
        p++;
        cause = 0x7f & *p;

        /* locate cause value */
        for (i = 0; i < cause_1tr6_len; i++)
                if (cause_1tr6[i].nr == cause)
                        break;

        /* display cause value if it exists */
        if (i == cause_1tr6_len)
                dp += sprintf(dp, "Unknown cause type %x!\n", cause);
        else
                dp += sprintf(dp, "  cause value %x : %s \n", cause, cause_1tr6[i].descr);

        return (dp - dest);

}

static int
prchident(char *dest, u_char *p)
{
        char *dp = dest;

        p += 2;
        dp += sprintf(dp, "    octet 3 ");
        dp += prbits(dp, *p, 8, 8);
        *dp++ = '\n';
        return (dp - dest);
}

static int
prcalled(char *dest, u_char *p)
{
        int l;
        char *dp = dest;

        p++;
        l = *p++ - 1;
        dp += sprintf(dp, "    octet 3 ");
        dp += prbits(dp, *p++, 8, 8);
        *dp++ = '\n';
        dp += sprintf(dp, "    number digits ");
        while (l--)
                *dp++ = *p++;
        *dp++ = '\n';
        return (dp - dest);
}
static int
prcalling(char *dest, u_char *p)
{
        int l;
        char *dp = dest;

        p++;
        l = *p++ - 1;
        dp += sprintf(dp, "    octet 3 ");
        dp += prbits(dp, *p, 8, 8);
        *dp++ = '\n';
        if (!(*p & 0x80)) {
                dp += sprintf(dp, "    octet 3a ");
                dp += prbits(dp, *++p, 8, 8);
                *dp++ = '\n';
                l--;
        };
        p++;

        dp += sprintf(dp, "    number digits ");
        while (l--)
                *dp++ = *p++;
        *dp++ = '\n';
        return (dp - dest);
}

static
int
prbearer(char *dest, u_char *p)
{
        char *dp = dest, ch;

        p += 2;
        dp += sprintf(dp, "    octet 3  ");
        dp += prbits(dp, *p++, 8, 8);
        *dp++ = '\n';
        dp += sprintf(dp, "    octet 4  ");
        dp += prbits(dp, *p, 8, 8);
        *dp++ = '\n';
        if ((*p++ & 0x1f) == 0x18) {
                dp += sprintf(dp, "    octet 4.1 ");
                dp += prbits(dp, *p++, 8, 8);
                *dp++ = '\n';
        }
        /* check for user information layer 1 */
        if ((*p & 0x60) == 0x20) {
                ch = ' ';
                do {
                        dp += sprintf(dp, "    octet 5%c ", ch);
                        dp += prbits(dp, *p, 8, 8);
                        *dp++ = '\n';
                        if (ch == ' ')
                                ch = 'a';
                        else
                                ch++;
                }
                while (!(*p++ & 0x80));
        }
        /* check for user information layer 2 */
        if ((*p & 0x60) == 0x40) {
                dp += sprintf(dp, "    octet 6  ");
                dp += prbits(dp, *p++, 8, 8);
                *dp++ = '\n';
        }
        /* check for user information layer 3 */
        if ((*p & 0x60) == 0x60) {
                dp += sprintf(dp, "    octet 7  ");
                dp += prbits(dp, *p++, 8, 8);
                *dp++ = '\n';
        }
        return (dp - dest);
}


static
int
prbearer_ni1(char *dest, u_char *p)
{
        char *dp = dest;
        u_char len;

        p++;
        len = *p++;
        dp += sprintf(dp, "    octet 3  ");
        dp += prbits(dp, *p, 8, 8);
        switch (*p++) {
        case 0x80:
                dp += sprintf(dp, " Speech");
                break;
        case 0x88:
                dp += sprintf(dp, " Unrestricted digital information");
                break;
        case 0x90:
                dp += sprintf(dp, " 3.1 kHz audio");
                break;
        default:
                dp += sprintf(dp, " Unknown information-transfer capability");
        }
        *dp++ = '\n';
        dp += sprintf(dp, "    octet 4  ");
        dp += prbits(dp, *p, 8, 8);
        switch (*p++) {
        case 0x90:
                dp += sprintf(dp, " 64 kbps, circuit mode");
                break;
        case 0xc0:
                dp += sprintf(dp, " Packet mode");
                break;
        default:
                dp += sprintf(dp, " Unknown transfer mode");
        }
        *dp++ = '\n';
        if (len > 2) {
                dp += sprintf(dp, "    octet 5  ");
                dp += prbits(dp, *p, 8, 8);
                switch (*p++) {
                case 0x21:
                        dp += sprintf(dp, " Rate adaption\n");
                        dp += sprintf(dp, "    octet 5a ");
                        dp += prbits(dp, *p, 8, 8);
                        break;
                case 0xa2:
                        dp += sprintf(dp, " u-law");
                        break;
                default:
                        dp += sprintf(dp, " Unknown UI layer 1 protocol");
                }
                *dp++ = '\n';
        }
        return (dp - dest);
}

static int
general(char *dest, u_char *p)
{
        char *dp = dest;
        char ch = ' ';
        int l, octet = 3;

        p++;
        l = *p++;
        /* Iterate over all octets in the information element */
        while (l--) {
                dp += sprintf(dp, "    octet %d%c ", octet, ch);
                dp += prbits(dp, *p++, 8, 8);
                *dp++ = '\n';

                /* last octet in group? */
                if (*p & 0x80) {
                        octet++;
                        ch = ' ';
                } else if (ch == ' ')
                        ch = 'a';
                else
                        ch++;
        }
        return (dp - dest);
}

static int
general_ni1(char *dest, u_char *p)
{
        char *dp = dest;
        char ch = ' ';
        int l, octet = 3;

        p++;
        l = *p++;
        /* Iterate over all octets in the information element */
        while (l--) {
                dp += sprintf(dp, "    octet %d%c ", octet, ch);
                dp += prbits(dp, *p, 8, 8);
                *dp++ = '\n';

                /* last octet in group? */
                if (*p++ & 0x80) {
                        octet++;
                        ch = ' ';
                } else if (ch == ' ')
                        ch = 'a';
                else
                        ch++;
        }
        return (dp - dest);
}

static int
prcharge(char *dest, u_char *p)
{
        char *dp = dest;
        int l;

        p++;
        l = *p++ - 1;
        dp += sprintf(dp, "    GEA ");
        dp += prbits(dp, *p++, 8, 8);
        dp += sprintf(dp, "  Anzahl: ");
        /* Iterate over all octets in the * information element */
        while (l--)
                *dp++ = *p++;
        *dp++ = '\n';
        return (dp - dest);
}
static int
prtext(char *dest, u_char *p)
{
        char *dp = dest;
        int l;

        p++;
        l = *p++;
        dp += sprintf(dp, "    ");
        /* Iterate over all octets in the * information element */
        while (l--)
                *dp++ = *p++;
        *dp++ = '\n';
        return (dp - dest);
}

static int
prfeatureind(char *dest, u_char *p)
{
        char *dp = dest;

        p += 2; /* skip id, len */
        dp += sprintf(dp, "    octet 3  ");
        dp += prbits(dp, *p, 8, 8);
        *dp++ = '\n';
        if (!(*p++ & 0x80)) {
                dp += sprintf(dp, "    octet 4  ");
                dp += prbits(dp, *p++, 8, 8);
                *dp++ = '\n';
        }
        dp += sprintf(dp, "    Status:  ");
        switch (*p) {
        case 0:
                dp += sprintf(dp, "Idle");
                break;
        case 1:
                dp += sprintf(dp, "Active");
                break;
        case 2:
                dp += sprintf(dp, "Prompt");
                break;
        case 3:
                dp += sprintf(dp, "Pending");
                break;
        default:
                dp += sprintf(dp, "(Reserved)");
                break;
        }
        *dp++ = '\n';
        return (dp - dest);
}

static
struct DTag { /* Display tags */
        u_char nr;
        char *descr;
} dtaglist[] = {
        { 0x82, "Continuation" },
        { 0x83, "Called address" },
        { 0x84, "Cause" },
        { 0x85, "Progress indicator" },
        { 0x86, "Notification indicator" },
        { 0x87, "Prompt" },
        { 0x88, "Accumlated digits" },
        { 0x89, "Status" },
        { 0x8a, "Inband" },
        { 0x8b, "Calling address" },
        { 0x8c, "Reason" },
        { 0x8d, "Calling party name" },
        { 0x8e, "Called party name" },
        { 0x8f, "Orignal called name" },
        { 0x90, "Redirecting name" },
        { 0x91, "Connected name" },
        { 0x92, "Originating restrictions" },
        { 0x93, "Date & time of day" },
        { 0x94, "Call Appearance ID" },
        { 0x95, "Feature address" },
        { 0x96, "Redirection name" },
        { 0x9e, "Text" },
};
#define DTAGSIZE ARRAY_SIZE(dtaglist)

static int
disptext_ni1(char *dest, u_char *p)
{
        char *dp = dest;
        int l, tag, len, i;

        p++;
        l = *p++ - 1;
        if (*p++ != 0x80) {
                dp += sprintf(dp, "    Unknown display type\n");
                return (dp - dest);
        }
        /* Iterate over all tag,length,text fields */
        while (l > 0) {
                tag = *p++;
                len = *p++;
                l -= len + 2;
                /* Don't space or skip */
                if ((tag == 0x80) || (tag == 0x81)) p++;
                else {
                        for (i = 0; i < DTAGSIZE; i++)
                                if (tag == dtaglist[i].nr)
                                        break;

                        /* When not found, give appropriate msg */
                        if (i != DTAGSIZE) {
                                dp += sprintf(dp, "    %s: ", dtaglist[i].descr);
                                while (len--)
                                        *dp++ = *p++;
                        } else {
                                dp += sprintf(dp, "    (unknown display tag %2x): ", tag);
                                while (len--)
                                        *dp++ = *p++;
                        }
                        dp += sprintf(dp, "\n");
                }
        }
        return (dp - dest);
}
static int
display(char *dest, u_char *p)
{
        char *dp = dest;
        char ch = ' ';
        int l, octet = 3;

        p++;
        l = *p++;
        /* Iterate over all octets in the * display-information element */
        dp += sprintf(dp, "   \"");
        while (l--) {
                dp += sprintf(dp, "%c", *p++);

                /* last octet in group? */
                if (*p & 0x80) {
                        octet++;
                        ch = ' ';
                } else if (ch == ' ')
                        ch = 'a';

                else
                        ch++;
        }
        *dp++ = '\"';
        *dp++ = '\n';
        return (dp - dest);
}

static int
prfacility(char *dest, u_char *p)
{
        char *dp = dest;
        int l, l2;

        p++;
        l = *p++;
        dp += sprintf(dp, "    octet 3 ");
        dp += prbits(dp, *p++, 8, 8);
        dp += sprintf(dp, "\n");
        l -= 1;

        while (l > 0) {
                dp += sprintf(dp, "   octet 4 ");
                dp += prbits(dp, *p++, 8, 8);
                dp += sprintf(dp, "\n");
                dp += sprintf(dp, "   octet 5 %d\n", l2 = *p++ & 0x7f);
                l -= 2;
                dp += sprintf(dp, "   contents ");
                while (l2--) {
                        dp += sprintf(dp, "%2x ", *p++);
                        l--;
                }
                dp += sprintf(dp, "\n");
        }

        return (dp - dest);
}

static
struct InformationElement {
        u_char nr;
        char *descr;
        int (*f) (char *, u_char *);
} ielist[] = {

        {
                0x00, "Segmented message", general
        },
        {
                0x04, "Bearer capability", prbearer
        },
        {
                0x08, "Cause", prcause
        },
        {
                0x10, "Call identity", general
        },
        {
                0x14, "Call state", general
        },
        {
                0x18, "Channel identification", prchident
        },
        {
                0x1c, "Facility", prfacility
        },
        {
                0x1e, "Progress indicator", general
        },
        {
                0x20, "Network-specific facilities", general

        },
        {
                0x27, "Notification indicator", general
        },
        {
                0x28, "Display", display
        },
        {
                0x29, "Date/Time", general
        },
        {
                0x2c, "Keypad facility", general
        },
        {
                0x34, "Signal", general
        },
        {
                0x40, "Information rate", general
        },
        {
                0x42, "End-to-end delay", general
        },
        {
                0x43, "Transit delay selection and indication", general
        },
        {
                0x44, "Packet layer binary parameters", general
        },
        {
                0x45, "Packet layer window size", general
        },
        {
                0x46, "Packet size", general
        },
        {
                0x47, "Closed user group", general
        },
        {
                0x4a, "Reverse charge indication", general
        },
        {
                0x6c, "Calling party number", prcalling
        },
        {
                0x6d, "Calling party subaddress", general
        },
        {
                0x70, "Called party number", prcalled
        },
        {
                0x71, "Called party subaddress", general
        },
        {
                0x74, "Redirecting number", general
        },
        {
                0x78, "Transit network selection", general
        },
        {
                0x79, "Restart indicator", general
        },
        {
                0x7c, "Low layer compatibility", general
        },
        {
                0x7d, "High layer compatibility", general
        },
        {
                0x7e, "User-user", general
        },
        {
                0x7f, "Escape for extension", general
        },
};


#define IESIZE ARRAY_SIZE(ielist)

static
struct InformationElement ielist_ni1[] = {
        { 0x04, "Bearer Capability", prbearer_ni1 },
        { 0x08, "Cause", prcause },
        { 0x14, "Call State", general_ni1 },
        { 0x18, "Channel Identification", prchident },
        { 0x1e, "Progress Indicator", general_ni1 },
        { 0x27, "Notification Indicator", general_ni1 },
        { 0x2c, "Keypad Facility", prtext },
        { 0x32, "Information Request", general_ni1 },
        { 0x34, "Signal", general_ni1 },
        { 0x38, "Feature Activation", general_ni1 },
        { 0x39, "Feature Indication", prfeatureind },
        { 0x3a, "Service Profile Identification (SPID)", prtext },
        { 0x3b, "Endpoint Identifier", general_ni1 },
        { 0x6c, "Calling Party Number", prcalling },
        { 0x6d, "Calling Party Subaddress", general_ni1 },
        { 0x70, "Called Party Number", prcalled },
        { 0x71, "Called Party Subaddress", general_ni1 },
        { 0x74, "Redirecting Number", general_ni1 },
        { 0x78, "Transit Network Selection", general_ni1 },
        { 0x7c, "Low Layer Compatibility", general_ni1 },
        { 0x7d, "High Layer Compatibility", general_ni1 },
};


#define IESIZE_NI1 ARRAY_SIZE(ielist_ni1)

static
struct InformationElement ielist_ni1_cs5[] = {
        { 0x1d, "Operator system access", general_ni1 },
        { 0x2a, "Display text", disptext_ni1 },
};

#define IESIZE_NI1_CS5 ARRAY_SIZE(ielist_ni1_cs5)

static
struct InformationElement ielist_ni1_cs6[] = {
        { 0x7b, "Call appearance", general_ni1 },
};

#define IESIZE_NI1_CS6 ARRAY_SIZE(ielist_ni1_cs6)

static struct InformationElement we_0[] =
{
        {WE0_cause, "Cause", prcause_1tr6},
        {WE0_connAddr, "Connecting Address", prcalled},
        {WE0_callID, "Call IDentity", general},
        {WE0_chanID, "Channel IDentity", general},
        {WE0_netSpecFac, "Network Specific Facility", general},
        {WE0_display, "Display", general},
        {WE0_keypad, "Keypad", general},
        {WE0_origAddr, "Origination Address", prcalled},
        {WE0_destAddr, "Destination Address", prcalled},
        {WE0_userInfo, "User Info", general}
};

#define WE_0_LEN ARRAY_SIZE(we_0)

static struct InformationElement we_6[] =
{
        {WE6_serviceInd, "Service Indicator", general},
        {WE6_chargingInfo, "Charging Information", prcharge},
        {WE6_date, "Date", prtext},
        {WE6_facSelect, "Facility Select", general},
        {WE6_facStatus, "Facility Status", general},
        {WE6_statusCalled, "Status Called", general},
        {WE6_addTransAttr, "Additional Transmission Attributes", general}
};
#define WE_6_LEN ARRAY_SIZE(we_6)

int
QuickHex(char *txt, u_char *p, int cnt)
{
        register int i;
        register char *t = txt;

        for (i = 0; i < cnt; i++) {
                *t++ = ' ';
                *t++ = hex_asc_hi(p[i]);
                *t++ = hex_asc_lo(p[i]);
        }
        *t++ = 0;
        return (t - txt);
}

void
LogFrame(struct IsdnCardState *cs, u_char *buf, int size)
{
        char *dp;

        if (size < 1)
                return;
        dp = cs->dlog;
        if (size < MAX_DLOG_SPACE / 3 - 10) {
                *dp++ = 'H';
                *dp++ = 'E';
                *dp++ = 'X';
                *dp++ = ':';
                dp += QuickHex(dp, buf, size);
                dp--;
                *dp++ = '\n';
                *dp = 0;
                HiSax_putstatus(cs, NULL, "%s", cs->dlog);
        } else
                HiSax_putstatus(cs, "LogFrame: ", "warning Frame too big (%d)", size);
}

void
dlogframe(struct IsdnCardState *cs, struct sk_buff *skb, int dir)
{
        u_char *bend, *buf;
        char *dp;
        unsigned char pd, cr_l, cr, mt;
        unsigned char sapi, tei, ftyp;
        int i, cset = 0, cs_old = 0, cs_fest = 0;
        int size, finish = 0;

        if (skb->len < 3)
                return;
        /* display header */
        dp = cs->dlog;
        dp += jiftime(dp, jiffies);
        *dp++ = ' ';
        sapi = skb->data[0] >> 2;
        tei  = skb->data[1] >> 1;
        ftyp = skb->data[2];
        buf = skb->data;
        dp += sprintf(dp, "frame %s ", dir ? "network->user" : "user->network");
        size = skb->len;

        if (tei == GROUP_TEI) {
                if (sapi == CTRL_SAPI) { /* sapi 0 */
                        if (ftyp == 3) {
                                dp += sprintf(dp, "broadcast\n");
                                buf += 3;
                                size -= 3;
                        } else {
                                dp += sprintf(dp, "no UI broadcast\n");
                                finish = 1;
                        }
                } else if (sapi == TEI_SAPI) {
                        dp += sprintf(dp, "tei management\n");
                        finish = 1;
                } else {
                        dp += sprintf(dp, "unknown sapi %d broadcast\n", sapi);
                        finish = 1;
                }
        } else {
                if (sapi == CTRL_SAPI) {
                        if (!(ftyp & 1)) { /* IFrame */
                                dp += sprintf(dp, "with tei %d\n", tei);
                                buf += 4;
                                size -= 4;
                        } else {
                                dp += sprintf(dp, "SFrame with tei %d\n", tei);
                                finish = 1;
                        }
                } else {
                        dp += sprintf(dp, "unknown sapi %d tei %d\n", sapi, tei);
                        finish = 1;
                }
        }
        bend = skb->data + skb->len;
        if (buf >= bend) {
                dp += sprintf(dp, "frame too short\n");
                finish = 1;
        }
        if (finish) {
                *dp = 0;
                HiSax_putstatus(cs, NULL, "%s", cs->dlog);
                return;
        }
        if ((0xfe & buf[0]) == PROTO_DIS_N0) {  /* 1TR6 */
                /* locate message type */
                pd = *buf++;
                cr_l = *buf++;
                if (cr_l)
                        cr = *buf++;
                else
                        cr = 0;
                mt = *buf++;
                if (pd == PROTO_DIS_N0) {       /* N0 */
                        for (i = 0; i < MT_N0_LEN; i++)
                                if (mt_n0[i].nr == mt)
                                        break;
                        /* display message type if it exists */
                        if (i == MT_N0_LEN)
                                dp += sprintf(dp, "callref %d %s size %d unknown message type N0 %x!\n",
                                              cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                              size, mt);
                        else
                                dp += sprintf(dp, "callref %d %s size %d message type %s\n",
                                              cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                              size, mt_n0[i].descr);
                } else {        /* N1 */
                        for (i = 0; i < MT_N1_LEN; i++)
                                if (mt_n1[i].nr == mt)
                                        break;
                        /* display message type if it exists */
                        if (i == MT_N1_LEN)
                                dp += sprintf(dp, "callref %d %s size %d unknown message type N1 %x!\n",
                                              cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                              size, mt);
                        else
                                dp += sprintf(dp, "callref %d %s size %d message type %s\n",
                                              cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                              size, mt_n1[i].descr);
                }

                /* display each information element */
                while (buf < bend) {
                        /* Is it a single octet information element? */
                        if (*buf & 0x80) {
                                switch ((*buf >> 4) & 7) {
                                case 1:
                                        dp += sprintf(dp, "  Shift %x\n", *buf & 0xf);
                                        cs_old = cset;
                                        cset = *buf & 7;
                                        cs_fest = *buf & 8;
                                        break;
                                case 3:
                                        dp += sprintf(dp, "  Congestion level %x\n", *buf & 0xf);
                                        break;
                                case 2:
                                        if (*buf == 0xa0) {
                                                dp += sprintf(dp, "  More data\n");
                                                break;
                                        }
                                        if (*buf == 0xa1) {
                                                dp += sprintf(dp, "  Sending complete\n");
                                        }
                                        break;
                                        /* fall through */
                                default:
                                        dp += sprintf(dp, "  Reserved %x\n", *buf);
                                        break;
                                }
                                buf++;
                                continue;
                        }
                        /* No, locate it in the table */
                        if (cset == 0) {
                                for (i = 0; i < WE_0_LEN; i++)
                                        if (*buf == we_0[i].nr)
                                                break;

                                /* When found, give appropriate msg */
                                if (i != WE_0_LEN) {
                                        dp += sprintf(dp, "  %s\n", we_0[i].descr);
                                        dp += we_0[i].f(dp, buf);
                                } else
                                        dp += sprintf(dp, "  Codeset %d attribute %x attribute size %d\n", cset, *buf, buf[1]);
                        } else if (cset == 6) {
                                for (i = 0; i < WE_6_LEN; i++)
                                        if (*buf == we_6[i].nr)
                                                break;

                                /* When found, give appropriate msg */
                                if (i != WE_6_LEN) {
                                        dp += sprintf(dp, "  %s\n", we_6[i].descr);
                                        dp += we_6[i].f(dp, buf);
                                } else
                                        dp += sprintf(dp, "  Codeset %d attribute %x attribute size %d\n", cset, *buf, buf[1]);
                        } else
                                dp += sprintf(dp, "  Unknown Codeset %d attribute %x attribute size %d\n", cset, *buf, buf[1]);
                        /* Skip to next element */
                        if (cs_fest == 8) {
                                cset = cs_old;
                                cs_old = 0;
                                cs_fest = 0;
                        }
                        buf += buf[1] + 2;
                }
        } else if ((buf[0] == 8) && (cs->protocol == ISDN_PTYPE_NI1)) { /* NI-1 */
                /* locate message type */
                buf++;
                cr_l = *buf++;
                if (cr_l)
                        cr = *buf++;
                else
                        cr = 0;
                mt = *buf++;
                for (i = 0; i < MTSIZE; i++)
                        if (mtlist[i].nr == mt)
                                break;

                /* display message type if it exists */
                if (i == MTSIZE)
                        dp += sprintf(dp, "callref %d %s size %d unknown message type %x!\n",
                                      cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                      size, mt);
                else
                        dp += sprintf(dp, "callref %d %s size %d message type %s\n",
                                      cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                      size, mtlist[i].descr);

                /* display each information element */
                while (buf < bend) {
                        /* Is it a single octet information element? */
                        if (*buf & 0x80) {
                                switch ((*buf >> 4) & 7) {
                                case 1:
                                        dp += sprintf(dp, "  Shift %x\n", *buf & 0xf);
                                        cs_old = cset;
                                        cset = *buf & 7;
                                        cs_fest = *buf & 8;
                                        break;
                                default:
                                        dp += sprintf(dp, "  Unknown single-octet IE %x\n", *buf);
                                        break;
                                }
                                buf++;
                                continue;
                        }
                        /* No, locate it in the table */
                        if (cset == 0) {
                                for (i = 0; i < IESIZE_NI1; i++)
                                        if (*buf == ielist_ni1[i].nr)
                                                break;

                                /* When not found, give appropriate msg */
                                if (i != IESIZE_NI1) {
                                        dp += sprintf(dp, "  %s\n", ielist_ni1[i].descr);
                                        dp += ielist_ni1[i].f(dp, buf);
                                } else
                                        dp += sprintf(dp, "  attribute %x attribute size %d\n", *buf, buf[1]);
                        } else if (cset == 5) {
                                for (i = 0; i < IESIZE_NI1_CS5; i++)
                                        if (*buf == ielist_ni1_cs5[i].nr)
                                                break;

                                /* When not found, give appropriate msg */
                                if (i != IESIZE_NI1_CS5) {
                                        dp += sprintf(dp, "  %s\n", ielist_ni1_cs5[i].descr);
                                        dp += ielist_ni1_cs5[i].f(dp, buf);
                                } else
                                        dp += sprintf(dp, "  attribute %x attribute size %d\n", *buf, buf[1]);
                        } else if (cset == 6) {
                                for (i = 0; i < IESIZE_NI1_CS6; i++)
                                        if (*buf == ielist_ni1_cs6[i].nr)
                                                break;

                                /* When not found, give appropriate msg */
                                if (i != IESIZE_NI1_CS6) {
                                        dp += sprintf(dp, "  %s\n", ielist_ni1_cs6[i].descr);
                                        dp += ielist_ni1_cs6[i].f(dp, buf);
                                } else
                                        dp += sprintf(dp, "  attribute %x attribute size %d\n", *buf, buf[1]);
                        } else
                                dp += sprintf(dp, "  Unknown Codeset %d attribute %x attribute size %d\n", cset, *buf, buf[1]);

                        /* Skip to next element */
                        if (cs_fest == 8) {
                                cset = cs_old;
                                cs_old = 0;
                                cs_fest = 0;
                        }
                        buf += buf[1] + 2;
                }
        } else if ((buf[0] == 8) && (cs->protocol == ISDN_PTYPE_EURO)) { /* EURO */
                /* locate message type */
                buf++;
                cr_l = *buf++;
                if (cr_l)
                        cr = *buf++;
                else
                        cr = 0;
                mt = *buf++;
                for (i = 0; i < MTSIZE; i++)
                        if (mtlist[i].nr == mt)
                                break;

                /* display message type if it exists */
                if (i == MTSIZE)
                        dp += sprintf(dp, "callref %d %s size %d unknown message type %x!\n",
                                      cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                      size, mt);
                else
                        dp += sprintf(dp, "callref %d %s size %d message type %s\n",
                                      cr & 0x7f, (cr & 0x80) ? "called" : "caller",
                                      size, mtlist[i].descr);

                /* display each information element */
                while (buf < bend) {
                        /* Is it a single octet information element? */
                        if (*buf & 0x80) {
                                switch ((*buf >> 4) & 7) {
                                case 1:
                                        dp += sprintf(dp, "  Shift %x\n", *buf & 0xf);
                                        break;
                                case 3:
                                        dp += sprintf(dp, "  Congestion level %x\n", *buf & 0xf);
                                        break;
                                case 5:
                                        dp += sprintf(dp, "  Repeat indicator %x\n", *buf & 0xf);
                                        break;
                                case 2:
                                        if (*buf == 0xa0) {
                                                dp += sprintf(dp, "  More data\n");
                                                break;
                                        }
                                        if (*buf == 0xa1) {
                                                dp += sprintf(dp, "  Sending complete\n");
                                        }
                                        break;
                                        /* fall through */
                                default:
                                        dp += sprintf(dp, "  Reserved %x\n", *buf);
                                        break;
                                }
                                buf++;
                                continue;
                        }
                        /* No, locate it in the table */
                        for (i = 0; i < IESIZE; i++)
                                if (*buf == ielist[i].nr)
                                        break;

                        /* When not found, give appropriate msg */
                        if (i != IESIZE) {
                                dp += sprintf(dp, "  %s\n", ielist[i].descr);
                                dp += ielist[i].f(dp, buf);
                        } else
                                dp += sprintf(dp, "  attribute %x attribute size %d\n", *buf, buf[1]);

                        /* Skip to next element */
                        buf += buf[1] + 2;
                }
        } else {
                dp += sprintf(dp, "Unknown protocol %x!", buf[0]);
        }
        *dp = 0;
        HiSax_putstatus(cs, NULL, "%s", cs->dlog);
}