source: rtems-libbsd/freebsd/contrib/tcpdump/print-pppoe.c @ 8440506

#include <machine/rtems-bsd-user-space.h>

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Original code by Greg Stark <gsstark@mit.edu> 
 */

#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.31 2005-04-26 19:48:38 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "ppp.h"
#include "ethertype.h"
#include "ether.h"
#include "extract.h"                    /* must come after interface.h */

/* Codes */
enum {
        PPPOE_PADI = 0x09,
        PPPOE_PADO = 0x07,
        PPPOE_PADR = 0x19,
        PPPOE_PADS = 0x65,
        PPPOE_PADT = 0xa7
};

static struct tok pppoecode2str[] = {
        { PPPOE_PADI, "PADI" },
        { PPPOE_PADO, "PADO" },
        { PPPOE_PADR, "PADR" },
        { PPPOE_PADS, "PADS" },
        { PPPOE_PADT, "PADT" },
        { 0, "" }, /* PPP Data */
        { 0, NULL }
};

/* Tags */
enum {
        PPPOE_EOL = 0,
        PPPOE_SERVICE_NAME = 0x0101,
        PPPOE_AC_NAME = 0x0102,
        PPPOE_HOST_UNIQ = 0x0103,
        PPPOE_AC_COOKIE = 0x0104,
        PPPOE_VENDOR = 0x0105,
        PPPOE_RELAY_SID = 0x0110,
        PPPOE_MAX_PAYLOAD = 0x0120,
        PPPOE_SERVICE_NAME_ERROR = 0x0201,
        PPPOE_AC_SYSTEM_ERROR = 0x0202,
        PPPOE_GENERIC_ERROR = 0x0203
};

static struct tok pppoetag2str[] = {
        { PPPOE_EOL, "EOL" },
        { PPPOE_SERVICE_NAME, "Service-Name" },
        { PPPOE_AC_NAME, "AC-Name" },
        { PPPOE_HOST_UNIQ, "Host-Uniq" },
        { PPPOE_AC_COOKIE, "AC-Cookie" },
        { PPPOE_VENDOR, "Vendor-Specific" },
        { PPPOE_RELAY_SID, "Relay-Session-ID" },
        { PPPOE_MAX_PAYLOAD, "PPP-Max-Payload" },
        { PPPOE_SERVICE_NAME_ERROR, "Service-Name-Error" },
        { PPPOE_AC_SYSTEM_ERROR, "AC-System-Error" },
        { PPPOE_GENERIC_ERROR, "Generic-Error" },
        { 0, NULL }
};

#define PPPOE_HDRLEN 6
#define MAXTAGPRINT 80

u_int
pppoe_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
        return (pppoe_print(p, h->len));
}

u_int
pppoe_print(register const u_char *bp, u_int length)
{
        u_int16_t pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid;
        u_int pppoe_length;
        const u_char *pppoe_packet, *pppoe_payload;

        if (length < PPPOE_HDRLEN) {
                (void)printf("truncated-pppoe %u", length);
                return (length);
        }
        length -= PPPOE_HDRLEN;
        pppoe_packet = bp;
        TCHECK2(*pppoe_packet, PPPOE_HDRLEN);
        pppoe_ver  = (pppoe_packet[0] & 0xF0) >> 4;
        pppoe_type  = (pppoe_packet[0] & 0x0F);
        pppoe_code = pppoe_packet[1];
        pppoe_sessionid = EXTRACT_16BITS(pppoe_packet + 2);
        pppoe_length    = EXTRACT_16BITS(pppoe_packet + 4);
        pppoe_payload = pppoe_packet + PPPOE_HDRLEN;

        if (pppoe_ver != 1) {
                printf(" [ver %d]",pppoe_ver);
        }
        if (pppoe_type != 1) {
                printf(" [type %d]",pppoe_type);
        }

        printf("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code));
        if (pppoe_code == PPPOE_PADI && pppoe_length > 1484 - PPPOE_HDRLEN) {
                printf(" [len %u!]",pppoe_length);
        }
        if (pppoe_length > length) {
                printf(" [len %u > %u!]", pppoe_length, length);
                pppoe_length = length;
        }
        if (pppoe_sessionid) {
                printf(" [ses 0x%x]", pppoe_sessionid);
        }

        if (pppoe_code) {
                /* PPP session packets don't contain tags */
                u_short tag_type = 0xffff, tag_len;
                const u_char *p = pppoe_payload;

                /*
                 * loop invariant:
                 * p points to current tag,
                 * tag_type is previous tag or 0xffff for first iteration
                 */
                while (tag_type && p < pppoe_payload + pppoe_length) {
                        TCHECK2(*p, 4);
                        tag_type = EXTRACT_16BITS(p);
                        tag_len = EXTRACT_16BITS(p + 2);
                        p += 4;
                        /* p points to tag_value */

                        if (tag_len) {
                                unsigned isascii = 0, isgarbage = 0;
                                const u_char *v;
                                char tag_str[MAXTAGPRINT];
                                unsigned tag_str_len = 0;

                                /* TODO print UTF-8 decoded text */
                                TCHECK2(*p, tag_len);
                                for (v = p; v < p + tag_len && tag_str_len < MAXTAGPRINT-1; v++)
                                        if (*v >= 32 && *v < 127) {
                                                tag_str[tag_str_len++] = *v;
                                                isascii++;
                                        } else {
                                                tag_str[tag_str_len++] = '.';
                                                isgarbage++;
                                        }
                                tag_str[tag_str_len] = 0;

                                if (isascii > isgarbage) {
                                        printf(" [%s \"%*.*s\"]",
                                               tok2str(pppoetag2str, "TAG-0x%x", tag_type),
                                               (int)tag_str_len,
                                               (int)tag_str_len,
                                               tag_str);
                                } else {
                                        /* Print hex, not fast to abuse printf but this doesn't get used much */
                                        printf(" [%s 0x", tok2str(pppoetag2str, "TAG-0x%x", tag_type));
                                        for (v=p; v<p+tag_len; v++) {
                                                printf("%02X", *v);
                                        }
                                        printf("]");
                                }
                                

                        } else
                                printf(" [%s]", tok2str(pppoetag2str,
                                    "TAG-0x%x", tag_type));

                        p += tag_len;
                        /* p points to next tag */
                }
                return (0);
        } else {
                /* PPPoE data */
                printf(" ");
                return (PPPOE_HDRLEN + ppp_print(pppoe_payload, pppoe_length));
        }

trunc:
        printf("[|pppoe]");
        return (PPPOE_HDRLEN);
}