usr.sbin/snoop/snoop_slp.c

	snoop_slp.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1998,2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <iconv.h>
#include "snoop.h"
#include "slp.h"

#define MAXSUMLEN 30

/* define VERIFYSLP to enable full message checking in summary mode */
#define VERIFYSLP

/* Globals -- ugly, yes, but fast and easy in macros */
static int msglength;
static int retlength;
static char *msgend;    /* the end of the summary message buffer */
static char *p;     /* current position in the packet */
static char *msgbuf;    /* message buffer for summary mode */
static boolean_t url_auth   = B_FALSE;
static boolean_t attr_auth  = B_FALSE;
static boolean_t fresh      = B_FALSE;
static boolean_t overflow   = B_FALSE;
static int v1_charset       = 0;    /* character set; only in V1 */

/* Entry points for parsing the protocol */
static int interpret_slp_v1(int, struct slpv1_hdr *, int);
static int interpret_slp_v2(int, struct slpv2_hdr *, int);

/* header parsing */
static int v1_header(int, struct slpv1_hdr *, int);
static int v2_header(int, struct slpv2_hdr *, int *, int);
static int v2_finish(struct slpv2_hdr *, int);

/* V2 auth blocks */
static int slpv2_authblock(int);

/* From snoop_rport: */
extern int add_transient(int, int (*)());

/*
 * Functions for parsing each protocol message
 * Each function takes the interpreter's flags argument as its input
 * parameter, and returns 1 on success, or 0 on message corruption.
 * retlength is set as a side-effect in summary mode.
 */
static int v2_srv_rqst(int);
static int v2_srv_rply(int);
static int v2_srv_reg(int);
static int v2_srv_dereg(int);
static int v2_srv_ack(int);
static int v2_attr_rqst(int);
static int v2_attr_rply(int);
static int v2_daadvert(int);
static int v2_srv_type_rqst(int);
static int v2_srv_type_rply(int);
static int v2_saadvert(int);

static int v1_srv_rqst(int);
static int v1_srv_rply(int);
static int v1_srv_reg(int);
static int v1_srv_dereg(int);
static int v1_srv_ack(int);
static int v1_attr_rqst(int);
static int v1_attr_rply(int);
static int v1_daadvert(int);
static int v1_srv_type_rqst(int);
static int v1_srv_type_rply(int);

/*
 * The dispatch tables for handling individual messages, keyed by
 * function number.
 */
typedef int function_handler();

#define V2_MAX_FUNCTION 11

static function_handler *v2_functions[V2_MAX_FUNCTION + 1] = {
    (function_handler *) NULL,
    (function_handler *) v2_srv_rqst,
    (function_handler *) v2_srv_rply,
    (function_handler *) v2_srv_reg,
    (function_handler *) v2_srv_dereg,
    (function_handler *) v2_srv_ack,
    (function_handler *) v2_attr_rqst,
    (function_handler *) v2_attr_rply,
    (function_handler *) v2_daadvert,
    (function_handler *) v2_srv_type_rqst,
    (function_handler *) v2_srv_type_rply,
    (function_handler *) v2_saadvert };

#define V1_MAX_FUNCTION 10

static function_handler *v1_functions[V1_MAX_FUNCTION + 1] = {
    (function_handler *) NULL,
    (function_handler *) v1_srv_rqst,
    (function_handler *) v1_srv_rply,
    (function_handler *) v1_srv_reg,
    (function_handler *) v1_srv_dereg,
    (function_handler *) v1_srv_ack,
    (function_handler *) v1_attr_rqst,
    (function_handler *) v1_attr_rply,
    (function_handler *) v1_daadvert,
    (function_handler *) v1_srv_type_rqst,
    (function_handler *) v1_srv_type_rply };

/* TCP continuation handling */
static boolean_t tcp_continuation = B_FALSE;

#define MAX_TCPCONT 16

static struct tcp_cont {
    int dst_port;
    char *msg;
    int totallen;
    int curr_offset;
} *tcp_cont[MAX_TCPCONT];

static int current_tcp_cont;

static void reg_tcp_cont(char *, int, int, int);
static int add_tcp_cont(struct tcp_cont *, char *, int);
static struct tcp_cont *find_tcp_cont(int);
static void remove_tcp_cont(int);

/* Conversions from numbers to strings */
static char *slpv2_func(int, boolean_t);
static char *slpv2_error(unsigned short);
static char *slpv1_func(int, boolean_t);
static char *slpv1_error(unsigned short);
static char *slpv1_charset(unsigned short);

/*
 * The only external entry point to the SLP interpreter. This function
 * simply dispatches the packet based on the version.
 */
void interpret_slp(int flags, char *slp, int fraglen) {
    extern int dst_port, curr_proto;
    struct tcp_cont *tce = NULL;

    msglength = fraglen;
    retlength = 0;
    p = slp;

    /* check if this is a TCP continuation */
    if (flags & F_DTAIL && curr_proto == IPPROTO_TCP) {
        tce = find_tcp_cont(dst_port);
        if (tce) {
        if (add_tcp_cont(tce, slp, fraglen)) {
            slp = tce->msg;
            fraglen = tce->curr_offset;
            tcp_continuation = B_TRUE;
        }
        }
    }
    if (*slp == 2 || tce)
        interpret_slp_v2(flags, (void *)slp, fraglen);
    else
        interpret_slp_v1(flags, (void *)slp, fraglen);

    tcp_continuation = B_FALSE;
}

/*
 * Primitives. These are implemented as much as possible as macros for
 * speed.
 */

#define FIELD_DEFAULT   0
#define FIELD_PREVRESP  1
#define FIELD_TYPENA    2

static long long netval = 0;    /* need signed 64 bit quantity */

/* gets two bytes from p and leaves the result in netval */
#define nbtohs() \
    netval = ((int)(p[0] & 0xff)) << 8; \
    netval += ((int)(p[1] & 0xff))

/* gets four bytes from p and leaves the result in netval */
#define nbtohl() \
    netval = ((int)(p[0] & 0xff)) << 24; \
    netval += ((int)(p[1] & 0xff)) << 16; \
    netval += ((int)(p[2] & 0xff)) << 8; \
    netval += ((int)(p[3] & 0xff))

#define get_byte() \
    if (msglength >= 1) { \
        netval = *p; \
        p++; \
        msglength--; \
    } else \
        netval = -1

#define GETBYTE(x) \
    get_byte(); \
    if ((retlength = netval) < 0) \
        return (0); \
    x = netval

#define SKIPBYTE \
    get_byte(); \
    if ((retlength = netval) < 0) \
        return (0); \

/*
 * gets two bytes from p, leaves the result in netval, and updates
 * msglength and p.
 */
#define get_short() \
    if (msglength >= sizeof (unsigned short)) { \
        nbtohs(); \
        p += sizeof (unsigned short); \
        msglength -= sizeof (unsigned short); \
    } else \
        netval = -1

#define GETSHORT(x) \
    get_short(); \
    if ((retlength = netval) < 0) \
        return (0); \
    x = netval

#define SKIPSHORT \
    get_short(); \
    if ((retlength = netval) < 0) \
        return (0)

#define get_int24(pp) \
    netval = ((int)((pp)[0] & 0xff)) << 16; \
    netval += ((int)((pp)[1] & 0xff)) << 8; \
    netval += ((int)((pp)[2] & 0xff))

static void slp_prevresp(char *p) {
    char *p2;

    /* cycle through all entries */
    for (; p != NULL; p = p2) {
        p2 = strchr(p, ',');
        if (p2 != NULL)
        *p2++ = '\0';

        /* print entry at p */
        sprintf(get_line(0, 0), "  \"%s\"", p);
    }
}

static int skip_field(int type) {
    unsigned short stringlen;

    get_short();
    if (netval < 0) {
        return (-1);
    }
    stringlen = netval;

    /* special case for NA field in SrvTypeRqst */
    if (type == FIELD_TYPENA && stringlen == 0xffff) {
        stringlen = 0;
    }

    if (stringlen > msglength) {
        return (-1);
    }

    msglength -= stringlen;
    p += stringlen;

    return (stringlen);
}

#define SKIPFIELD(type) \
    if ((retlength = skip_field(type)) < 0) \
        return (0)

#define GETFIELD \
    get_short(); \
    if ((retlength = netval) < 0) \
        return (0); \
    strncat(msgbuf, p, (retlength > MAXSUMLEN ? MAXSUMLEN : retlength)); \
    p += retlength; \
    msglength -= retlength

/*
 * Determines from the first five bytes of a potential SLP header
 * if the following message is really an SLP message. Returns 1 if
 * it is a real SLP message, 0 if not.
 */
int valid_slp(unsigned char *slphdr, int len) {
    struct slpv1_hdr slp1;
    struct slpv2_hdr slp2;

    len -= (8 /* udp */ + 20 /* IP */ + 14 /* ether */);
    /* a valid version will be 1 or 2 */
    switch (*slphdr) {
    case 1:
        memcpy(&slp1, slphdr, 5);
        /* valid function? */
        if (slp1.function > V1_MAX_FUNCTION) {
        return (0);
        }
        /* valid length heuristic */
        if (slp1.length > len) {
        return (0);
        }
        return (1);
    case 2:
        memcpy(&slp2, slphdr, 5);
        /* valid function? */
        if (slp2.function > V2_MAX_FUNCTION) {
        return (0);
        }
        /* valid length heuristic */
        get_int24(&(slp2.l1));
        if (netval > len) {
        return (0);
        }
        return (1);
    default:
        return (0);
    }
}

/*
 * Converts a V1 char encoding to UTF8. If this fails, returns 0,
 * otherwise, 1. This function is the union of iconv UTF-8
 * modules and character sets registered with IANA.
 */
static int make_utf8(char *outbuf, size_t outlen,
            const char *inbuf, size_t inlen) {
    iconv_t cd;
    size_t converted;

    switch (v1_charset) {
    case 4:
    case 1004:
        cd = iconv_open("UTF-8", "8859-1");
        break;
    case 5:
        cd = iconv_open("UTF-8", "8859-2");
        break;
    case 6:
        cd = iconv_open("UTF-8", "8859-3");
        break;
    case 7:
        cd = iconv_open("UTF-8", "8859-4");
        break;
    case 8:
        cd = iconv_open("UTF-8", "8859-5");
        break;
    case 9:
        cd = iconv_open("UTF-8", "8859-6");
        break;
    case 10:
        cd = iconv_open("UTF-8", "8859-7");
        break;
    case 11:
        cd = iconv_open("UTF-8", "8859-8");
        break;
    case 12:
        cd = iconv_open("UTF-8", "8859-9");
        break;
    case 13:
        cd = iconv_open("UTF-8", "8859-10");
        break;
    case 37:
        cd = iconv_open("UTF-8", "ko_KR-iso2022-7");
        break;
    case 104:
        cd = iconv_open("UTF-8", "iso2022");
        break;
    case 1000:
        cd = iconv_open("UTF-8", "UCS-2");
        break;
    case 1001:
        cd = iconv_open("UTF-8", "UCS-4");
        break;
    default:
        /*
         * charset not set, or reserved, or not supported, so
         * just copy it and hope for the best.
         */
        converted = outlen < inlen ? outlen : inlen;
        memcpy(outbuf, inbuf, converted);
        outbuf[converted] = 0;
        return (1);
    }

    if (cd == (iconv_t)-1) {
        return (0);
    }

    if ((converted = iconv(cd, &inbuf, &inlen, &outbuf, &outlen))
        == (size_t)-1) {
        return (0);
    }

    outbuf[converted] = 0;
    iconv_close(cd);

    return (1);
}

static int slp_field(char *tag, int type) {
    int length;

    get_short();
    if (netval < 0) {
        return (-1);
    }
    length = netval;

    /* special case for NA field in SrvTypeRqst */
    if (type == FIELD_TYPENA && length == 0xffff) {
        sprintf(get_line(0, 0), "%s: length = -1: Use all NAs", tag);
        return (0);
    }

    sprintf(get_line(0, 0), "%s: length = %d", tag, length);
    if (length > msglength) {
        /* framing error: message is not long enough to contain data */
        sprintf(get_line(0, 0),
            "  [Framing error: remaining pkt length = %u]",
            msglength);
        return (-1);
    }

    if (length > 0) {
        char *buf = malloc(length + 1);
        if (buf != NULL) {
        if (v1_charset) {
            if (!make_utf8(buf, length, p, length)) {
            strcpy(buf, "[Invalid Character Encoding]");
            }
        } else {
            memcpy(buf, p, length);
            buf[length] = '\0';     /* ensure null-terminated */
        }

        switch (type) {
            case FIELD_PREVRESP:
            slp_prevresp(buf);
            break;

            default:
            sprintf(get_line(0, 0), "  \"%s\"", buf);
            break;
        }
        free(buf);
        }

        p += length;
        msglength -= length;
    }

    /* return ok */
    return (0);
}

static int slpv2_url(int cnt) {
    time_t exp;
    int lifetime, length, n;

    /* reserved */
    get_byte();
    if (netval < 0)
        return (-1);

    /* lifetime */
    get_short();
    if ((lifetime = netval) < 0)
        return (-1);

    /* length */
    get_short();
    if ((length = netval) < 0)
        return (-1);

    /* time */
    exp = time(0) + lifetime;
    if (cnt == -1)
        sprintf(get_line(0, 0),
            "URL: length = %u, lifetime = %d (%24.24s)",
            length, lifetime, ctime(&exp));
    else
        /* number the URLs to make it easier to parse them */
        sprintf(get_line(0, 0),
            "URL %d: length = %u, lifetime = %d (%24.24s)",
            cnt, length, lifetime, ctime(&exp));

    if (length > msglength) {
        if (!tcp_continuation)
        /* framing error: message is not long enough to contain data */
        sprintf(get_line(0, 0),
            "  [Framing error: remaining pkt length = %u]",
            msglength);
        return (-1);
    }

    if (length > 0) {
        char *buf = malloc(length + 1);
        if (buf != NULL) {
        memcpy(buf, p, length);
        buf[length] = '\0';     /* ensure null-terminated */
        sprintf(get_line(0, 0), "  \"%s\"", buf);
        free(buf);
        }
    }
    msglength -= length;
    p += length;

    get_byte();
    if ((n = netval) < 0)
        return (-1);

    if (n > 0) {
        int i;
        sprintf(get_line(0, 0), "%d Authentication Blocks", n);
        for (i = 0; i < n; i++)
        if ((length = slpv2_authblock(i)) < 0)
            return (-1);
    }
    return (0);
}

#define DOFIELD(tag, type) \
    if (slp_field(tag, type) < 0) \
        return (0)

#define V2_DOURL(x) \
    if (slpv2_url(x) < 0) \
        return (0)

#define V2_DOERRCODE \
    if (msglength < sizeof (unsigned short)) \
        return (0); \
    nbtohs(); \
    errcode = netval; \
    sprintf(get_line(0, 0), "Error code = %d, %s", \
                errcode, slpv2_error(errcode)); \
    p += sizeof (unsigned short); \
    msglength -= sizeof (unsigned short); \
    if (errcode != OK) \
        msglength = 0;  /* skip rest of message */ \
    if (errcode != OK) \
        return (0)

#define V2_DOAUTH(cnt) \
    if (slpv2_authblock(cnt) < 0) \
        return (0)

#define V2_DOTIMESTAMP \
    if (msglength < 4) \
        return (0); \
    nbtohl(); \
    timestamp = netval; \
    sprintf(get_line(0, 0), "Timestamp = %u, %s", \
        timestamp, (timestamp ? convert_ts(timestamp) : "0")); \
    p += 4; \
    msglength -= 4

/* some V1 macros */
#define SKIPAUTH(auth) \
    if (auth && ((retlength = skip_v1authblock()) < 0)) \
        return (0)

#define DOERRCODE \
    if (msglength < sizeof (unsigned short)) \
        return (0); \
    nbtohs(); \
    errcode = netval; \
    sprintf(get_line(0, 0), "Error code = %d, %s", errcode, \
                slpv1_error(errcode)); \
    p += sizeof (unsigned short); \
    msglength -= sizeof (unsigned short); \
    if (errcode != OK) \
        return (0)

#define DOURL \
    if (slpv1_url(url_auth) < 0) \
        return (0)

#define DOAUTH(auth) \
    if (auth && slpv1_authblock() < 0) \
        return (0)

/*
 * TCP Continuation handling
 * We keep track of continuations in a fixed size cache, so as to prevent
 * memory leaks if some continuations are never finished. The continuations
 * are indexed by their destination ports.
 */
static void reg_tcp_cont(char *msg, int totallen,
                int fraglen, int dst_port) {
    struct tcp_cont *tce = malloc(sizeof (*tce));

    /* always overwrite the entry at current_tcp_cont */
    if (tcp_cont[current_tcp_cont]) {
        free(tcp_cont[current_tcp_cont]->msg);
        free(tcp_cont[current_tcp_cont]);
    }

    tce->dst_port = dst_port;
    tce->msg = malloc(totallen);
    memcpy(tce->msg, msg, fraglen);
    tce->totallen = totallen;
    tce->curr_offset = fraglen;

    tcp_cont[current_tcp_cont++] = tce;
    if (current_tcp_cont == MAX_TCPCONT)
        current_tcp_cont = 0;
}

/* returns 0 if there is a mismatch error, 1 on success */
static int add_tcp_cont(struct tcp_cont *tce, char *msg, int fraglen) {
    if ((fraglen + tce->curr_offset) > tce->totallen)
        return (0);

    memcpy(tce->msg + tce->curr_offset, msg, fraglen);
    tce->curr_offset += fraglen;
    return (1);
}

static struct tcp_cont *find_tcp_cont(int dst_port) {
    int i;
    for (i = current_tcp_cont; i >= 0; i--)
        if (tcp_cont[i] && tcp_cont[i]->dst_port == dst_port)
        return (tcp_cont[i]);

    for (i = MAX_TCPCONT -1; i > current_tcp_cont; i--)
        if (tcp_cont[i] && tcp_cont[i]->dst_port == dst_port)
        return (tcp_cont[i]);

    return (NULL);
}

static void remove_tcp_cont(int dst_port) {
    int i;
    for (i = current_tcp_cont; i >= 0; i--)
        if (tcp_cont[i] && tcp_cont[i]->dst_port == dst_port) {
        free(tcp_cont[i]->msg);
        free(tcp_cont[i]);
        tcp_cont[i] = NULL;
        return;
        }

    for (i = MAX_TCPCONT -1; i > current_tcp_cont; i--)
        if (tcp_cont[i] && tcp_cont[i]->dst_port == dst_port) {
        free(tcp_cont[i]->msg);
        free(tcp_cont[i]);
        tcp_cont[i] = NULL;
        return;
        }
}

/*
 * V2 interpreter
 */

static int interpret_slp_v2(int flags, struct slpv2_hdr *slp, int fraglen) {
    extern int src_port, dst_port, curr_proto;
    char msgbuf_real[256];
    int totallen = 0;

    msgbuf = msgbuf_real;

    /*
     * Somewhat of a hack to decode traffic from a server that does
     * not send udp replies from its SLP src port.
     */

    if (curr_proto == IPPROTO_UDP &&
        dst_port == 427 &&
        src_port != 427) {
        add_transient(src_port, (int (*)())interpret_slp);
    }

    /* parse the header */
    if (v2_header(flags, slp, &totallen, fraglen)) {

        if (slp->function <= V2_MAX_FUNCTION && slp->function > 0) {

        /* Parse the message body */
        if ((v2_functions[slp->function])(flags)) {

            /* finish any remaining tasks */
            v2_finish(slp, flags);

        }

        }

    }

    /* summary error check */
    if (flags & F_SUM) {
        if (retlength < 0) {
        if (curr_proto == IPPROTO_TCP)
            sprintf(get_sum_line(),
                "%s [partial TCP message]", msgbuf);
        else if (overflow)
            sprintf(get_sum_line(), "%s [OVERFLOW]", msgbuf);
        else
            sprintf(get_sum_line(), "%s [CORRUPTED MESSAGE]", msgbuf);
        }
#ifdef VERIFYSLP
        else if (msglength > 0)
        sprintf(get_sum_line(), "%s +%d", msgbuf, msglength);
#endif
        else
        sprintf(get_sum_line(), "%s", msgbuf);
    } else if (flags & F_DTAIL) {
        /* detailed error check */
        if (msglength > 0) {
        if (tcp_continuation) {
            sprintf(get_line(0, 0),
                "[TCP Continuation, %d bytes remaining]",
                totallen - fraglen);
        } else
            sprintf(get_line(0, 0),
            "[%d extra bytes at end of SLP message]", msglength);
        }

        show_trailer();

        if (tcp_continuation && msglength == 0)
        remove_tcp_cont(dst_port);
    }

    return (0);
}

static int v2_header(int flags,
            struct slpv2_hdr *slp,
            int *totallen,
            int fraglen) {
    extern int curr_proto, dst_port;
    char *prototag = (curr_proto == IPPROTO_TCP ? "/tcp" : "");

    if ((slp->flags & V2_OVERFLOW) == V2_OVERFLOW)
        overflow = B_TRUE;

    /* summary mode header parsing */
    if (flags & F_SUM) {

        /* make sure we have at least a header */
        if (msglength < sizeof (*slp)) {
        sprintf(get_sum_line(), "SLP V2 [Incomplete Header]");
        return (0);
        }

        sprintf(msgbuf, "SLP V2 %s [%d%s] ",
            slpv2_func(slp->function, B_TRUE),
            ntohs(slp->xid), prototag);

        /* skip to end of header */
        msgend = msgbuf + strlen(msgbuf);
        msglength -= sizeof (*slp);
        p += sizeof (*slp);

        /* skip language tag */
        SKIPFIELD(FIELD_DEFAULT);
    } else if (flags & F_DTAIL) {
        char *lang;
        int len;

        /* detailed mode header parsing */
        show_header("SLP:  ", "Service Location Protocol (v2)", fraglen);
        show_space();

        if (msglength < sizeof (*slp)) {
        sprintf(get_line(0, 0), "==> Incomplete SLP header");
        return (0);
        }

        sprintf(get_line(0, 0), "Version = %d", slp->vers);
        sprintf(get_line(0, 0), "Function = %d, %s",
            slp->function, slpv2_func(slp->function, B_FALSE));
        get_int24(&(slp->l1));
        *totallen = netval;
        sprintf(get_line(0, 0), "Message length = %u", *totallen);
        /* check for TCP continuation */
        if (curr_proto == IPPROTO_TCP &&
        *totallen > msglength &&
        !tcp_continuation) {
        tcp_continuation = B_TRUE;
        reg_tcp_cont((char *)slp, *totallen, msglength, dst_port);
        }

        if (!tcp_continuation && *totallen != msglength) {
        sprintf(get_line(0, 0),
            "  (Stated and on-the-wire lengths differ)");
        }
        /* flags */
        sprintf(get_line(0, 0), "Flags = 0x%02x", slp->flags);
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V2_OVERFLOW,
                "overflow", "no overflow"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V2_FRESH,
                "fresh registration", "no fresh registration"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V2_MCAST,
                "request multicast / broadcast", "unicast"));
        /* check reserved flags that must be zero */
        if ((slp->flags & 7) != 0) {
        sprintf(get_line(0, 0),
            "      .... .xxx = %d (reserved flags nonzero)",
            slp->flags & 7);
        }
        /* end of flags */

        /* language tag */
        p = (char *)slp + sizeof (*slp);
        msglength -= sizeof (*slp);
        GETSHORT(len);
        if (len > msglength) {
        sprintf(get_line(0, 0),
            "Language Tag Length = %u [CORRUPT MESSAGE]",
            len);
        return (0);
        }

        lang = get_line(0, 0);
        strcpy(lang, "Language Tag = ");
        strncat(lang,  p, len);
        sprintf(get_line(0, 0), "XID = %u", ntohs(slp->xid));

        /* set msglength to remaining length of SLP message */
        p += len;
        msglength -= len;
    }

    return (1);
}

static int v2_finish(struct slpv2_hdr *slp, int flags) {
    unsigned int firstop;

    if (!(flags & F_DTAIL))
        return (1);

    /* check for options */
    get_int24(&(slp->o1));
    firstop = netval;

    if (firstop) {
        unsigned short op_id;
        unsigned short nextop;
        char *op_class;

        for (;;) {
        unsigned short real_oplen;

        if (msglength < 4) {
            sprintf(get_line(0, 0),
                "Option expected but not present");
            return (0);
        }

        nbtohs();
        op_id = netval;
        p += sizeof (unsigned short);
        msglength -= sizeof (unsigned short);
        nbtohs();
        nextop = netval;
        p += sizeof (unsigned short);
        msglength -= sizeof (unsigned short);

        real_oplen = nextop ? nextop : msglength;

        /* known options */
        switch (op_id) {
        case 1:
            sprintf(get_line(0, 0),
                "Option: Required Attribute Missing");
            DOFIELD("Template IDVer", FIELD_DEFAULT);
            DOFIELD("Required Attrs", FIELD_DEFAULT);
            break;
        default:
            sprintf(get_line(0, 0), "Option: Unknown");
            p += (real_oplen - 4);
            msglength -= (real_oplen - 4);
            break;
        }

        if (op_id < 0x3fff)
            op_class = "Standardized, optional";
        else if (op_id < 0x7fff)
            op_class = "Standardized, mandatory";
        else if (op_id < 0x8fff)
            op_class = "Not standardized, private";
        else if (op_id < 0xffff)
            op_class = "Reserved";
        sprintf(get_line(0, 0), "Option ID = 0x%04x, %s",
            op_id, op_class);
        if (nextop &&
            ((nextop - 4) > msglength) &&
            !tcp_continuation) {
            sprintf(get_line(0, 0),
                "[Framing error: remaining pkt length = %u]",
                msglength);
            return (0);
        }

        sprintf(get_line(0, 0), "Option Length = %u", real_oplen);

        if (!nextop)
            break;
        }
    }

    return (1);
}

#ifdef VERIFYSLP
static int skip_v2authblock() {
    unsigned short length, slen;

    /* auth header */
    if (msglength < 10)
        return (-1);

    /* block descriptor: 2 bytes */
    p += sizeof (unsigned short);
    /* length */
    nbtohs();
    length = netval;
    p += sizeof (unsigned short);
    /* timestamp */
    p += 4;
    /* SPI String length */
    nbtohs();
    slen = netval;
    p += sizeof (unsigned short);

    msglength -= 10;
    if (slen > msglength || length > (msglength + 10))
        return (-1);

    p += slen;
    msglength -= slen;

    /* structured auth block */
    p += (length - 10 - slen);
    msglength -= (length - 10 - slen);
    return (0);
}
#endif

static char *display_bsd(unsigned short bsd) {
    switch (bsd) {
    case 1: return ("MD5 with RSA");
    case 2: return ("DSA with SHA-1");
    case 3: return ("Keyed HMAC with MD5");
    default: return ("Unknown BSD");
    }
}

static char *slpv2_func(int t, boolean_t s) {
    static char buf[128];

    switch (t) {
    case V2_SRVRQST:    return s? "SrvRqst"  : "Service Request";
    case V2_SRVRPLY:    return s? "SrvRply"  : "Service Reply";
    case V2_SRVREG:     return s? "SrvReg"   : "Service Registration";
    case V2_SRVDEREG:
        return (s ? "SrvDereg" : "Service Deregistration");
    case V2_SRVACK:     return s? "SrvAck"   : "Service Acknowledge";
    case V2_ATTRRQST:   return s? "AttrRqst" : "Attribute Request";
    case V2_ATTRRPLY:   return s? "AttrRply" : "Attribute Reply";
    case V2_DAADVERT:   return s? "DAAdvert" : "DA advertisement";
    case V2_SRVTYPERQST:
        return (s ? "SrvTypeRqst" : "Service Type Request");
    case V2_SRVTYPERPLY:
        return (s ? "SrvTypeRply" : "Service Type Reply");
    case V2_SAADVERT:   return s? "SAAdvert" : "SA advertisement";
    }
    sprintf(buf, "(func %d)", t);
    return (s ? buf : "unknown function");
}

static char *slpv2_error(unsigned short code) {
    static char buf[128];

    switch (code) {
    case OK:            return "ok";
    case LANG_NOT_SUPPORTED:    return "language not supported";
    case PROTOCOL_PARSE_ERR:    return "protocol parse error";
    case INVALID_REGISTRATION:  return "invalid registration";
    case SCOPE_NOT_SUPPORTED:   return "scope not supported";
    case AUTHENTICATION_UNKNOWN:    return "authentication unknown";
    case V2_AUTHENTICATION_ABSENT:  return "authentication absent";
    case V2_AUTHENTICATION_FAILED:  return "authentication failed";
    case V2_VER_NOT_SUPPORTED:  return "version not supported";
    case V2_INTERNAL_ERROR:     return "internal error";
    case V2_DA_BUSY_NOW:        return "DA busy";
    case V2_OPTION_NOT_UNDERSTOOD:  return "option not understood";
    case V2_INVALID_UPDATE:     return "invalid update";
    case V2_RQST_NOT_SUPPORTED: return "request not supported";
    case INVALID_LIFETIME:      return "invalid lifetime";
    }
    sprintf(buf, "error %d", code);
    return (buf);
}

static char *convert_ts(unsigned int timestamp) {
    /* timestamp is in UNIX time */
    static char buff[128];

    strcpy(buff, ctime((time_t *)&timestamp));
    buff[strlen(buff) - 1] = '\0';
    return (buff);
}

static int slpv2_authblock(int cnt) {
    unsigned short bsd, length, slen;
    char *pp, *scopes;
    unsigned int timestamp;

    if (msglength < 10) {
        sprintf(get_line(0, 0),
        "  [no room for auth block header: remaining msg length = %u]",
            msglength);
        return (-1);
    }

    /* bsd */
    nbtohs();
    bsd = netval;
    p += sizeof (unsigned short);

    /* length */
    nbtohs();
    length = netval;
    p += sizeof (unsigned short);

    /* timestamp */
    nbtohl();
    timestamp = netval;
    p += 4;

    /* SPI String length */
    nbtohs();
    slen = netval;
    p += sizeof (unsigned short);

    msglength -= 10;
    if (slen > msglength) {
        sprintf(get_line(0, 0),
        "  [no room for auth block scopes: remaining msg length = %u]",
            msglength);
        return (-1);
    }

    if (length > (msglength + 10)) {
        if (!tcp_continuation)
        /* framing error: message is not long enough to contain data */
        sprintf(get_line(0, 0),
            "  [Framing error: remaining pkt length = %u]",
            msglength);
        return (-1);
    }

    scopes = p;
    p += slen;
    msglength -= slen;

    sprintf(get_line(0, 0),
        "Auth block %d: timestamp = %s", cnt,
        (timestamp) ? convert_ts(timestamp) : "0");

    pp = get_line(0, 0);
    strcpy(pp, "              SPI = ");
    strncat(pp, scopes, slen);

    sprintf(get_line(0, 0),
        "              block desc = 0x%04x: %s", bsd, display_bsd(bsd));

    sprintf(get_line(0, 0), "              length = %u", length);

    p += (length - 10 - slen);
    msglength -= (length - 10 - slen);
    return (0);
}

static int v2_srv_rqst(int flags) {
    if (flags & F_SUM) {
        SKIPFIELD(FIELD_DEFAULT);   /* PR list */
        GETFIELD;           /* service type */
        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        strcat(msgend, " [");
        GETFIELD;           /* predicate */
        strcat(msgend, "]");
        SKIPFIELD(FIELD_DEFAULT);   /* SPI */
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_DEFAULT);
        DOFIELD("Service type",  FIELD_DEFAULT);
        DOFIELD("Scopes",  FIELD_DEFAULT);
        DOFIELD("Predicate string",  FIELD_DEFAULT);
        DOFIELD("Requested SPI", FIELD_DEFAULT);
    }

    return (1);
}

static int v2_srv_rply(int flags) {
    unsigned short itemcnt, errcode;
    int n;

    if (flags & F_SUM) {
        int i, auth_cnt;

        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv2_error(errcode));
        msglength = 0;  /* skip rest of message */
        return (0);
        } else {
        GETSHORT(itemcnt);
        sprintf(msgend, "%d URL entries", itemcnt);
#ifdef VERIFYSLP
        for (n = 0; n < itemcnt; n++) {
            SKIPBYTE;           /* reserved */
            SKIPSHORT;          /* lifetime */
            SKIPFIELD(FIELD_DEFAULT);   /* URL */
            GETBYTE(auth_cnt);
            for (i = 0; i < auth_cnt; auth_cnt++)
            if (skip_v2authblock() < 0)
                return (0);
        }
#endif
        }
    } else if (flags & F_DTAIL) {
        V2_DOERRCODE;
        GETSHORT(itemcnt);
        sprintf(get_line(0, 0), "URL entry count = %d", itemcnt);
        for (n = 0; n < itemcnt; n++) {
        V2_DOURL(n);
        }
    }

    return (1);
}

static int v2_srv_reg(int flags) {
    int i, auth_cnt;

    if (flags & F_SUM) {
        SKIPBYTE;           /* reserved */
        SKIPSHORT;          /* lifetime */
        GETFIELD;           /* URL */
#ifdef VERIFYSLP
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        if (skip_v2authblock() < 0)
            return (0);
        SKIPFIELD(FIELD_DEFAULT);   /* type */
        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        SKIPFIELD(FIELD_DEFAULT);   /* attrs */
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        if (skip_v2authblock() < 0)
            return (0);
#endif
    } if (flags & F_DTAIL) {
        V2_DOURL(-1);
        DOFIELD("Service type", FIELD_DEFAULT);
        DOFIELD("Scopes", FIELD_DEFAULT);
        DOFIELD("Attribute list", FIELD_DEFAULT);
        /* auth */
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        V2_DOAUTH(i);
    }

    return (1);
}

static int v2_srv_dereg(int flags) {
    if (flags & F_SUM) {
        int i, auth_cnt;

        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        SKIPBYTE;           /* reserved */
        SKIPSHORT;          /* lifetime */
        GETFIELD;           /* URL */

#ifdef VERIFYSLP
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        if (skip_v2authblock() < 0)
            return (0);
        SKIPFIELD(FIELD_DEFAULT);   /* attrs */
#endif
    } else if (flags & F_DTAIL) {
        DOFIELD("Scopes", FIELD_DEFAULT);
        V2_DOURL(-1);
        DOFIELD("Tag list",  FIELD_DEFAULT);
    }

    return (1);
}

static int v2_srv_ack(int flags) {
    unsigned short errcode;
    if (flags & F_SUM) {
        GETSHORT(errcode);
        strcat(msgbuf, slpv2_error(errcode));
    } else if (flags & F_DTAIL) {
        V2_DOERRCODE;
    }

    return (1);
}

static int v2_attr_rqst(int flags) {
    if (flags  & F_SUM) {
        SKIPFIELD(FIELD_DEFAULT);   /* PR list */
        GETFIELD;           /* URL */
        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        strcat(msgend, " [");
        GETFIELD;           /* attrs */
        strcat(msgend, "]");

#ifdef VERIFYSLP
        SKIPFIELD(FIELD_DEFAULT);   /* SPI */
#endif
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_DEFAULT);
        DOFIELD("URL",  FIELD_DEFAULT);
        DOFIELD("Scopes",  FIELD_DEFAULT);
        DOFIELD("Tag list",  FIELD_DEFAULT);
        DOFIELD("Requested SPI", FIELD_DEFAULT);
    }

    return (1);
}

static int v2_attr_rply(int flags) {
    int auth_cnt, i;
    unsigned short errcode;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv2_error(errcode));
        msglength = 0;  /* skip rest of message */
        return (0);
        } else {
        GETFIELD;           /* attr list */

#ifdef VERIFYSLP
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
            if (skip_v2authblock() < 0)
            return (0);
#endif
        }
    } else if (flags & F_DTAIL) {
        V2_DOERRCODE;
        DOFIELD("Attribute list", FIELD_DEFAULT);
        /* auth */
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        V2_DOAUTH(i);
    }

    return (1);
}

static int v2_daadvert(int flags) {
    int auth_cnt, i;
    unsigned short errcode;
    unsigned int timestamp;

    if (flags & F_SUM) {
        SKIPSHORT;          /* error code */
        SKIPSHORT; SKIPSHORT;   /* timestamp */
        GETFIELD;           /* URL */

#ifdef VERIFYSLP
        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        SKIPFIELD(FIELD_DEFAULT);   /* attrs */
        SKIPFIELD(FIELD_DEFAULT);   /* SPIs */

        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        if (skip_v2authblock() < 0)
            return (0);
#endif
    } else if (flags & F_DTAIL) {
        V2_DOERRCODE;
        V2_DOTIMESTAMP;
        DOFIELD("URL", FIELD_DEFAULT);
        DOFIELD("Scope list", FIELD_DEFAULT);
        DOFIELD("Attribute list", FIELD_DEFAULT);
        DOFIELD("Configured SPIs", FIELD_DEFAULT);
        /* auth */
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        V2_DOAUTH(i);
    }

    return (1);
}

static int v2_srv_type_rqst(int flags) {
    if (flags & F_SUM) {
        SKIPFIELD(FIELD_DEFAULT);   /* prev responders */
        SKIPFIELD(FIELD_TYPENA);    /* naming authority */
        GETFIELD;           /* scope */
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_DEFAULT);
        DOFIELD("Naming authority", FIELD_TYPENA);
        DOFIELD("Scopes",  FIELD_DEFAULT);
    }

    return (1);
}

static int v2_srv_type_rply(int flags) {
    unsigned short errcode;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK)
        strcat(msgbuf, slpv2_error(errcode));
        else
        GETFIELD;
    } else if (flags & F_DTAIL) {
        V2_DOERRCODE;
        DOFIELD("Service types", FIELD_DEFAULT);
    }

    return (1);
}

static int v2_saadvert(int flags) {
    int auth_cnt, i;

    if (flags & F_SUM) {
        GETFIELD;           /* URL */

#ifdef VERIFYSLP
        SKIPFIELD(FIELD_DEFAULT);   /* scopes */
        SKIPFIELD(FIELD_DEFAULT);   /* attrs */

        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        if (skip_v2authblock() < 0)
            return (0);
#endif
    } else if (flags & F_DTAIL) {
        DOFIELD("URL", FIELD_DEFAULT);
        DOFIELD("Scopes",  FIELD_DEFAULT);
        DOFIELD("Attribute list", FIELD_DEFAULT);
        /* auth */
        GETBYTE(auth_cnt);
        for (i = 0; i < auth_cnt; i++)
        V2_DOAUTH(i);
    }

    return (1);
}

/*
 * V1 Interpreter
 */

static int interpret_slp_v1(int flags, struct slpv1_hdr *slp, int fraglen) {
    char msgbuf_real[256];
    extern int src_port, dst_port, curr_proto;
    boolean_t overflow  = B_FALSE;

    msgbuf = msgbuf_real;

    if (msglength >= sizeof (*slp)) {
        if ((slp->flags & V1_URL_AUTH) == V1_URL_AUTH)
        url_auth = B_TRUE;
        if ((slp->flags & V1_ATTR_AUTH) == V1_ATTR_AUTH)
        attr_auth = B_TRUE;
        if ((slp->flags & V1_FRESH_REG) == V1_FRESH_REG)
        fresh = B_TRUE;
        if ((slp->flags & V1_OVERFLOW) == V1_OVERFLOW)
        overflow = B_TRUE;
    }

    /*
     * Somewhat of a hack to decode traffic from a server that does
     * not send udp replies from its SLP src port.
     */
    if (curr_proto == IPPROTO_UDP &&
        dst_port == 427 &&
        src_port != 427)
        add_transient(src_port, (int (*)())interpret_slp);

    /* parse the header */
    if (v1_header(flags, slp, fraglen)) {

        if (slp->function <= V1_MAX_FUNCTION && slp->function > 0) {

        /* Parse the message body */
        (v1_functions[slp->function])(flags);

        }

    }

    /* summary error check */
    if (flags & F_SUM) {
        if (retlength < 0) {
        if (curr_proto == IPPROTO_TCP)
            sprintf(get_sum_line(),
                "%s [partial TCP message]",
                msgbuf);
        else if (overflow)
            sprintf(get_sum_line(), "%s [OVERFLOW]", msgbuf);
        else
            sprintf(get_sum_line(), "%s [CORRUPTED MESSAGE]", msgbuf);
        }
#ifdef VERIFYSLP
        else if (msglength > 0)
        sprintf(get_sum_line(), "%s +%d", msgbuf, msglength);
#endif
        else
        sprintf(get_sum_line(), "%s", msgbuf);
    } else if (flags & F_DTAIL) {
        /* detail error check */
        if (msglength > 0) {
        sprintf(get_line(0, 0),
            "[%d extra bytes at end of SLP message]", msglength);
        }

        show_trailer();

    }

    v1_charset = 0;

    return (0);
}

static int v1_header(int flags,
            struct slpv1_hdr *slp,
            int fraglen) {
    extern int src_port, dst_port, curr_proto;
    char *prototag = (curr_proto == IPPROTO_TCP? "/tcp" : "");

    if (flags & F_SUM) {
        char portflag = ' ';

        if (msglength < sizeof (*slp)) {
        sprintf(msgbuf, "SLP V1 [incomplete header]");
        return (0);
        }

        if (slp->vers != 1) {
        if (curr_proto == IPPROTO_TCP)
            sprintf(msgbuf, "SLP [TCP Continuation]");
        else
            sprintf(msgbuf, "SLP [unknown version %d]", slp->vers);
        return (0);
        }

        if (src_port != 427 && dst_port != 427)
        portflag = '-';

        sprintf(msgbuf, "SLP V1%c%s [%d%s] ", portflag,
            slpv1_func(slp->function, B_TRUE),
            ntohs(slp->xid), prototag);
        msgend = msgbuf + strlen(msgbuf);
        msglength -= sizeof (*slp);
        p += sizeof (*slp);
    } else if (flags & F_DTAIL) {
        show_header("SLP:  ", "Service Location Protocol (v1)", fraglen);
        show_space();

        if (msglength < sizeof (*slp)) {
        sprintf(get_line(0, 0), "==> Incomplete SLP header");
        return (0);
        }

        sprintf(get_line(0, 0), "Version = %d", slp->vers);
        if (slp->vers != 1) {
        if (curr_proto == IPPROTO_TCP)
            sprintf(get_line(0, 0), "==> TCP continuation");
        else
            sprintf(get_line(0, 0), "==> Unexpected version number");
        return (0);
        }
        sprintf(get_line(0, 0), "Function = %d, %s",
        slp->function, slpv1_func(slp->function, B_FALSE));
        sprintf(get_line(0, 0), "Message length = %u", ntohs(slp->length));

        /* flags */
        sprintf(get_line(0, 0), "Flags = 0x%02x", slp->flags);
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V1_OVERFLOW,
                "overflow", "no overflow"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V1_MONOLINGUAL,
                "monolingual", "not monolingual"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V1_URL_AUTH,
                "url authentication", "no url authentication"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V1_ATTR_AUTH,
        "attribute authentication", "no attribute authentication"));
        sprintf(get_line(0, 0), "      %s",
            getflag(slp->flags, V1_FRESH_REG,
                "fresh registration", "no fresh registration"));
        /* check reserved flags that must be zero */
        if ((slp->flags & 7) != 0) {
        sprintf(get_line(0, 0),
            "      .... .xxx = %d (reserved flags nonzero)",
            slp->flags & 7);
        }
        /* end of flags */

        sprintf(get_line(0, 0), "Dialect = %u", slp->dialect);
        sprintf(get_line(0, 0), "Language = 0x%02x%02x, %c%c",
            slp->language[0], slp->language[1],
            slp->language[0], slp->language[1]);
        v1_charset = ntohs(slp->charset);
        sprintf(get_line(0, 0), "Character encoding = %u, %s",
            v1_charset,
            slpv1_charset(v1_charset));
        sprintf(get_line(0, 0), "XID = %u", ntohs(slp->xid));

        /* set msglength to remaining length of SLP message */
        msglength -= sizeof (*slp);
        p += sizeof (*slp);
    }

    return (1);
}

static char *slpv1_func(int t, boolean_t s) {
    static char buf[128];
    switch (t) {
    case V1_SRVREQ: return s? "SrvRqst"  : "Service Request";
    case V1_SRVRPLY:    return s? "SrvRply"  : "Service Reply";
    case V1_SRVREG: return s? "SrvReg"   : "Service Registration";
    case V1_SRVDEREG:   return s?
                    "SrvDereg" : "Service Deregistration";
    case V1_SRVACK: return s? "SrvAck"   : "Service Acknowledge";
    case V1_ATTRRQST:   return s? "AttrRqst" : "Attribute Request";
    case V1_ATTRRPLY:   return s? "AttrRply" : "Attribute Reply";
    case V1_DAADVERT:   return s? "DAAdvert" : "DA advertisement";
    case V1_SRVTYPERQST:return s? "SrvTypeRqst" : "Service Type Request";
    case V1_SRVTYPERPLY:return s? "SrvTypeRply" : "Service Type Reply";
    }
    sprintf(buf, "(func %d)", t);
    return (s ? buf : "unknown function");
}

static char *slpv1_error(unsigned short code) {
    static char buf[128];

    switch (code) {
        case OK:            return "ok";
        case LANG_NOT_SUPPORTED:    return "language not supported";
        case PROTOCOL_PARSE_ERR:    return "protocol parse error";
        case INVALID_REGISTRATION:  return "invalid registration";
        case SCOPE_NOT_SUPPORTED:   return "scope not supported";
        case CHARSET_NOT_UNDERSTOOD:return "character set not understood";
        case AUTHENTICATION_INVALID:return "invalid authentication";
        case NOT_SUPPORTED_YET: return "not yet supported";
        case REQUEST_TIMED_OUT: return "request timed out";
        case COULD_NOT_INIT_NET_RESOURCES:
                return ("could not initialize net resources");
        case COULD_NOT_ALLOCATE_MEMORY:
                    return ("could not allocate memory");
        case PARAMETER_BAD:     return "bad parameter";
        case INTERNAL_NET_ERROR:    return "internal network error";
        case INTERNAL_SYSTEM_ERROR: return "internal system error";
    }
    sprintf(buf, "error %d", code);
    return (buf);
}

/*
 *  Character set info from
 *    www.isi.edu/in-notes/iana/assignments/character-sets
 *
 *  Assigned MIB enum Numbers
 *  -------------------------
 *  0               Reserved
 *  1               Reserved
 *  3-106           Set By Standards Organizations
 *  1000-1010       Unicode / 10646
 *  2000-2087       Vendor
 *  2250-2258       Vendor
 *
 *  MIBenum: 3
 *  Alias: US-ASCII (preferred MIME name)
 *  Source: ECMA registry [RFC1345]
 *
 *  MIBenum: 106
 *  Name: UTF-8
 *  Source: RFC 2044
 */

static char *slpv1_charset(unsigned short code) {
    if (code <= 1)
        return ("Reserved");
    if (code == 3)
        return ("US-ASCII");
    if (code == 4)
        return ("latin1");
    if (code == 106)
        return ("UTF-8");
    if (code >= 3 && code <= 106)
        return ("set by standards organization");
    if (code >= 1000 && code <= 1010)
        return ("Unicode variant");
    if ((code >= 2000 && code <= 2087) ||
        (code >= 2250 && code <= 2258))
        return ("Vendor assigned");

    return ("unknown");
}

#ifdef VERIFYSLP
static int skip_v1authblock() {
    unsigned short length;

    /* auth header: 12 bytes total */
    if (msglength < 12)
        return (-1);

    /* timestamp: 8 bytes */
    p += 8;         /* timestamp: 8 bytes */
    p += sizeof (short);        /* block descriptor: 2 bytes */
    nbtohs();
    length = netval;
    p += sizeof (short);
    msglength -= 12;

    if (length > msglength) {
        /* framing error: message is not long enough to contain data */
        return (-1);
    }

    p += length;
    msglength -= length;
    return (0);
}
#endif

static int slpv1_authblock() {
    unsigned short bsd, length;
    char msgbuf[128];
    int n;

    if (msglength < 12) {
        sprintf(get_line(0, 0),
            "  [no room for auth block: remaining msg length = %u]",
            msglength);
        return (-1);
    }

    /* timestamp: 8 bytes */
    *msgbuf = '\0';
    for (n = 0; n < 8; n++, p += 1) {
        char tmp[16];
        sprintf(tmp, "%02x", (unsigned char)(*p));
        strcat(msgbuf, tmp);
    }

    nbtohs();
    bsd = netval;
    p += sizeof (short);
    nbtohs();
    length = netval;
    p += sizeof (short);
    msglength -= 12;

    sprintf(get_line(0, 0),
        "  Auth block: timestamp = %s",
        msgbuf);
    sprintf(get_line(0, 0),
        "              block desc = 0x%04x, length = %u",
        bsd, length);
    if (length > msglength) {
        /* framing error: message is not long enough to contain data */
        sprintf(get_line(0, 0),
        "  [Framing error: remaining pkt length = %u]",  msglength);
        return (-1);
    }

    p += length;
    msglength -= length;
    return (0);
}

static int slpv1_url(boolean_t auth_present) {
    time_t exp;
    int lifetime, length;

    get_short();
    if ((lifetime = netval) < 0)
        return (-1);
    get_short();
    if ((length = netval) < 0)
        return (-1);

    exp = time(0) + lifetime;
    sprintf(get_line(0, 0), "URL: length = %u, lifetime = %d (%24.24s)",
        length, lifetime, ctime(&exp));
    if (length > msglength) {
        /* framing error: message is not long enough to contain data */
        sprintf(get_line(0, 0),
        "  [Framing error: remaining pkt length = %u]",  msglength);
        return (-1);
    }

    if (length > 0) {
        char *buf = malloc(length + 1);
        if (buf != NULL) {
        if (!make_utf8(buf, length, p, length)) {
            strcpy(buf, "[Invalid Character Encoding]");
        }
        sprintf(get_line(0, 0), "  \"%s\"", buf);
        free(buf);
        }
    }
    msglength -= length;
    p += length;

    if (auth_present)
        return (slpv1_authblock());

    return (0);
}

static int v1_srv_rqst(int flags) {
    if (flags & F_SUM) {
        SKIPFIELD(FIELD_PREVRESP);  /* prev responders */
        GETFIELD;           /* predicate */
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_PREVRESP);
        DOFIELD("predicate string", FIELD_DEFAULT);
    }

    return (1);
}

static int v1_srv_rply(int flags) {
    unsigned short errcode, itemcnt;
    int n;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv1_error(errcode));
        } else {
        GETSHORT(itemcnt);
        sprintf(msgend, "%d URL entries", itemcnt);
#ifdef VERIFYSLP
        for (n = 0; n < itemcnt; n++) {
            SKIPSHORT;      /* lifetime */
            SKIPFIELD(FIELD_DEFAULT);   /* URL */
            SKIPAUTH(url_auth);     /* URL auth */
        }
#endif
        }
    } else if (flags & F_DTAIL) {
        DOERRCODE;
        GETSHORT(itemcnt);
        sprintf(get_line(0, 0), "URL entry count = %d", itemcnt);
        for (n = 0; n < itemcnt; n++) {
        DOURL;
        }
    }

    return (1);
}

static int v1_srv_reg(int flags) {
    if (flags & F_SUM) {
        SKIPSHORT;          /* lifetime */
        GETFIELD;           /* URL */
#ifdef VERIFYSLP
        SKIPAUTH(url_auth);     /* URL auth */
        SKIPFIELD(FIELD_DEFAULT);   /* attribute list */
        SKIPAUTH(attr_auth);        /* attr auth */
#endif
    } else if (flags & F_DTAIL) {
        DOURL;
        DOFIELD("Attribute list", FIELD_DEFAULT);
        DOAUTH(attr_auth);
    }

    return (1);
}

static int v1_srv_ack(int flags) {
    unsigned short errcode;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        strcat(msgbuf, slpv1_error(errcode));
        if (errcode == OK && fresh) {
        strcat(msgbuf, " [Fresh]");
        }
    } else if (flags & F_DTAIL) {
        DOERRCODE;
    }

    return (1);
}

static int v1_srv_dereg(int flags) {
    if (flags & F_SUM) {
        GETFIELD;           /* URL */
#ifdef VERIFYSLP
        SKIPAUTH(url_auth);
        SKIPFIELD(FIELD_DEFAULT);   /* tag spec */
#endif
    } else if (flags & F_DTAIL) {
        DOFIELD("URL", FIELD_DEFAULT);
        DOAUTH(url_auth);
        DOFIELD("Tag spec", FIELD_DEFAULT);
    }

    return (1);
}

static int v1_attr_rqst(int flags) {
    if (flags & F_SUM) {
        SKIPFIELD(FIELD_PREVRESP);  /* prev responders */
        GETFIELD;           /* URL */
#ifdef VERIFYSLP
        SKIPFIELD(FIELD_DEFAULT);   /* scope */
        SKIPFIELD(FIELD_DEFAULT);   /* select list */
#endif
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_PREVRESP);
        DOFIELD("URL", FIELD_DEFAULT);
        DOFIELD("Scope", FIELD_DEFAULT);
        DOFIELD("Select list", FIELD_DEFAULT);
    }

    return (1);
}

static int v1_attr_rply(int flags) {
    unsigned short errcode;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv1_error(errcode));
        } else {
        GETFIELD;           /* attr list */
#ifdef VERIFYSLP
        SKIPAUTH(attr_auth);
#endif
        }
    } else if (flags & F_DTAIL) {
        DOERRCODE;
        DOFIELD("Attribute list", FIELD_DEFAULT);
        DOAUTH(attr_auth);
    }

    return (1);
}

static int v1_daadvert(int flags) {
    unsigned short errcode;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv1_error(errcode));
        } else {
            GETFIELD;           /* URL */
#ifdef VERIFYSLP
            SKIPFIELD(FIELD_DEFAULT);   /* scope list */
#endif
        }
    } else if (flags & F_DTAIL) {
        DOERRCODE;
        DOFIELD("URL", FIELD_DEFAULT);
        DOFIELD("Scope list", FIELD_DEFAULT);
    }

    return (1);
}

static int v1_srv_type_rqst(int flags) {
    if (flags & F_SUM) {
        SKIPFIELD(FIELD_PREVRESP);  /* prev responders */
        SKIPFIELD(FIELD_TYPENA);    /* naming authority */
        GETFIELD;           /* scope */
    } else if (flags & F_DTAIL) {
        DOFIELD("Previous responders", FIELD_PREVRESP);
        DOFIELD("Naming authority", FIELD_TYPENA);
        DOFIELD("Scope string", FIELD_DEFAULT);
    }

    return (1);
}

static int v1_srv_type_rply(int flags) {
    unsigned short errcode, itemcnt;
    int n;

    if (flags & F_SUM) {
        GETSHORT(errcode);
        if (errcode != OK) {
        strcat(msgbuf, slpv1_error(errcode));
        } else {
        GETSHORT(itemcnt);
        sprintf(msgend, "%d type entries", itemcnt);
#ifdef VERIFYSLP
        for (n = 0; n < itemcnt; n++) {
            SKIPFIELD(FIELD_DEFAULT);  /* Service type item */
        }
#endif
        }
    } else if (flags & F_DTAIL) {
        DOERRCODE;
        GETSHORT(itemcnt);
        sprintf(get_line(0, 0), "Service type count = %d", itemcnt);
        for (n = 0; n < itemcnt; n++) {
        DOFIELD("  Service type item", FIELD_DEFAULT);
        }
    }

    return (1);
}