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|
/*
* Copyright (c) 1990, 1991, 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.
*
* Format and print bootp packets.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.80 2005-05-06 04:19:25 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 "extract.h"
#include "ether.h"
#include "bootp.h"
static void rfc1048_print(const u_char *);
static void cmu_print(const u_char *);
static char tstr[] = " [|bootp]";
static const struct tok bootp_flag_values[] = {
{ 0x8000, "Broadcast" },
{ 0, NULL}
};
static const struct tok bootp_op_values[] = {
{ BOOTPREQUEST, "Request" },
{ BOOTPREPLY, "Reply" },
{ 0, NULL}
};
/*
* Print bootp requests
*/
void
bootp_print(register const u_char *cp, u_int length)
{
register const struct bootp *bp;
static const u_char vm_cmu[4] = VM_CMU;
static const u_char vm_rfc1048[4] = VM_RFC1048;
bp = (const struct bootp *)cp;
TCHECK(bp->bp_op);
printf("BOOTP/DHCP, %s",
tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
TCHECK2(bp->bp_chaddr[0], 6);
printf(" from %s", etheraddr_string(bp->bp_chaddr));
}
printf(", length: %u", length);
if (!vflag)
return;
TCHECK(bp->bp_secs);
/* The usual hardware address type is 1 (10Mb Ethernet) */
if (bp->bp_htype != 1)
printf(", htype-#%d", bp->bp_htype);
/* The usual length for 10Mb Ethernet address is 6 bytes */
if (bp->bp_htype != 1 || bp->bp_hlen != 6)
printf(", hlen:%d", bp->bp_hlen);
/* Only print interesting fields */
if (bp->bp_hops)
printf(", hops:%d", bp->bp_hops);
if (bp->bp_xid)
printf(", xid:0x%x", EXTRACT_32BITS(&bp->bp_xid));
if (bp->bp_secs)
printf(", secs:%d", EXTRACT_16BITS(&bp->bp_secs));
printf(", flags: [%s]",
bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
if (vflag>1)
printf( " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
/* Client's ip address */
TCHECK(bp->bp_ciaddr);
if (bp->bp_ciaddr.s_addr)
printf("\n\t Client IP: %s", ipaddr_string(&bp->bp_ciaddr));
/* 'your' ip address (bootp client) */
TCHECK(bp->bp_yiaddr);
if (bp->bp_yiaddr.s_addr)
printf("\n\t Your IP: %s", ipaddr_string(&bp->bp_yiaddr));
/* Server's ip address */
TCHECK(bp->bp_siaddr);
if (bp->bp_siaddr.s_addr)
printf("\n\t Server IP: %s", ipaddr_string(&bp->bp_siaddr));
/* Gateway's ip address */
TCHECK(bp->bp_giaddr);
if (bp->bp_giaddr.s_addr)
printf("\n\t Gateway IP: %s", ipaddr_string(&bp->bp_giaddr));
/* Client's Ethernet address */
if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
TCHECK2(bp->bp_chaddr[0], 6);
printf("\n\t Client Ethernet Address: %s", etheraddr_string(bp->bp_chaddr));
}
TCHECK2(bp->bp_sname[0], 1); /* check first char only */
if (*bp->bp_sname) {
printf("\n\t sname \"");
if (fn_print(bp->bp_sname, snapend)) {
putchar('"');
fputs(tstr + 1, stdout);
return;
}
putchar('"');
}
TCHECK2(bp->bp_file[0], 1); /* check first char only */
if (*bp->bp_file) {
printf("\n\t file \"");
if (fn_print(bp->bp_file, snapend)) {
putchar('"');
fputs(tstr + 1, stdout);
return;
}
putchar('"');
}
/* Decode the vendor buffer */
TCHECK(bp->bp_vend[0]);
if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
sizeof(u_int32_t)) == 0)
rfc1048_print(bp->bp_vend);
else if (memcmp((const char *)bp->bp_vend, vm_cmu,
sizeof(u_int32_t)) == 0)
cmu_print(bp->bp_vend);
else {
u_int32_t ul;
ul = EXTRACT_32BITS(&bp->bp_vend);
if (ul != 0)
printf("\n\t Vendor-#0x%x", ul);
}
return;
trunc:
fputs(tstr, stdout);
}
/*
* The first character specifies the format to print:
* i - ip address (32 bits)
* p - ip address pairs (32 bits + 32 bits)
* l - long (32 bits)
* L - unsigned long (32 bits)
* s - short (16 bits)
* b - period-seperated decimal bytes (variable length)
* x - colon-seperated hex bytes (variable length)
* a - ascii string (variable length)
* B - on/off (8 bits)
* $ - special (explicit code to handle)
*/
static struct tok tag2str[] = {
/* RFC1048 tags */
{ TAG_PAD, " PAD" },
{ TAG_SUBNET_MASK, "iSM" }, /* subnet mask (RFC950) */
{ TAG_TIME_OFFSET, "LTZ" }, /* seconds from UTC */
{ TAG_GATEWAY, "iDG" }, /* default gateway */
{ TAG_TIME_SERVER, "iTS" }, /* time servers (RFC868) */
{ TAG_NAME_SERVER, "iIEN" }, /* IEN name servers (IEN116) */
{ TAG_DOMAIN_SERVER, "iNS" }, /* domain name (RFC1035) */
{ TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */
{ TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */
{ TAG_LPR_SERVER, "iLPR" }, /* lpr server (RFC1179) */
{ TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */
{ TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */
{ TAG_HOSTNAME, "aHN" }, /* ascii hostname */
{ TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */
{ TAG_END, " END" },
/* RFC1497 tags */
{ TAG_DUMPPATH, "aDP" },
{ TAG_DOMAINNAME, "aDN" },
{ TAG_SWAP_SERVER, "iSS" },
{ TAG_ROOTPATH, "aRP" },
{ TAG_EXTPATH, "aEP" },
/* RFC2132 tags */
{ TAG_IP_FORWARD, "BIPF" },
{ TAG_NL_SRCRT, "BSRT" },
{ TAG_PFILTERS, "pPF" },
{ TAG_REASS_SIZE, "sRSZ" },
{ TAG_DEF_TTL, "bTTL" },
{ TAG_MTU_TIMEOUT, "lMA" },
{ TAG_MTU_TABLE, "sMT" },
{ TAG_INT_MTU, "sMTU" },
{ TAG_LOCAL_SUBNETS, "BLSN" },
{ TAG_BROAD_ADDR, "iBR" },
{ TAG_DO_MASK_DISC, "BMD" },
{ TAG_SUPPLY_MASK, "BMS" },
{ TAG_DO_RDISC, "BRD" },
{ TAG_RTR_SOL_ADDR, "iRSA" },
{ TAG_STATIC_ROUTE, "pSR" },
{ TAG_USE_TRAILERS, "BUT" },
{ TAG_ARP_TIMEOUT, "lAT" },
{ TAG_ETH_ENCAP, "BIE" },
{ TAG_TCP_TTL, "bTT" },
{ TAG_TCP_KEEPALIVE, "lKI" },
{ TAG_KEEPALIVE_GO, "BKG" },
{ TAG_NIS_DOMAIN, "aYD" },
{ TAG_NIS_SERVERS, "iYS" },
{ TAG_NTP_SERVERS, "iNTP" },
{ TAG_VENDOR_OPTS, "bVO" },
{ TAG_NETBIOS_NS, "iWNS" },
{ TAG_NETBIOS_DDS, "iWDD" },
{ TAG_NETBIOS_NODE, "$WNT" },
{ TAG_NETBIOS_SCOPE, "aWSC" },
{ TAG_XWIN_FS, "iXFS" },
{ TAG_XWIN_DM, "iXDM" },
{ TAG_NIS_P_DOMAIN, "sN+D" },
{ TAG_NIS_P_SERVERS, "iN+S" },
{ TAG_MOBILE_HOME, "iMH" },
{ TAG_SMPT_SERVER, "iSMTP" },
{ TAG_POP3_SERVER, "iPOP3" },
{ TAG_NNTP_SERVER, "iNNTP" },
{ TAG_WWW_SERVER, "iWWW" },
{ TAG_FINGER_SERVER, "iFG" },
{ TAG_IRC_SERVER, "iIRC" },
{ TAG_STREETTALK_SRVR, "iSTS" },
{ TAG_STREETTALK_STDA, "iSTDA" },
{ TAG_REQUESTED_IP, "iRQ" },
{ TAG_IP_LEASE, "lLT" },
{ TAG_OPT_OVERLOAD, "$OO" },
{ TAG_TFTP_SERVER, "aTFTP" },
{ TAG_BOOTFILENAME, "aBF" },
{ TAG_DHCP_MESSAGE, " DHCP" },
{ TAG_SERVER_ID, "iSID" },
{ TAG_PARM_REQUEST, "bPR" },
{ TAG_MESSAGE, "aMSG" },
{ TAG_MAX_MSG_SIZE, "sMSZ" },
{ TAG_RENEWAL_TIME, "lRN" },
{ TAG_REBIND_TIME, "lRB" },
{ TAG_VENDOR_CLASS, "aVC" },
{ TAG_CLIENT_ID, "$CID" },
/* RFC 2485 */
{ TAG_OPEN_GROUP_UAP, "aUAP" },
/* RFC 2563 */
{ TAG_DISABLE_AUTOCONF, "BNOAUTO" },
/* RFC 2610 */
{ TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */
{ TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */
/* RFC 2937 */
{ TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */
/* RFC 3011 */
{ TAG_IP4_SUBNET_SELECT, "iSUBNET" },
/* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
{ TAG_USER_CLASS, "aCLASS" },
{ TAG_SLP_NAMING_AUTH, "aSLP-NA" },
{ TAG_CLIENT_FQDN, "$FQDN" },
{ TAG_AGENT_CIRCUIT, "bACKT" },
{ TAG_AGENT_REMOTE, "bARMT" },
{ TAG_AGENT_MASK, "bAMSK" },
{ TAG_TZ_STRING, "aTZSTR" },
{ TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */
{ TAG_AUTH, "bAUTH" }, /* XXX 'b' */
{ TAG_VINES_SERVERS, "iVINES" },
{ TAG_SERVER_RANK, "sRANK" },
{ TAG_CLIENT_ARCH, "sARCH" },
{ TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */
{ TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */
{ TAG_LDAP_URL, "aLDAP" },
{ TAG_6OVER4, "i6o4" },
{ TAG_PRINTER_NAME, "aPRTR" },
{ TAG_MDHCP_SERVER, "bMDHCP" }, /* XXX 'b' */
{ TAG_IPX_COMPAT, "bIPX" }, /* XXX 'b' */
{ TAG_NETINFO_PARENT, "iNI" },
{ TAG_NETINFO_PARENT_TAG, "aNITAG" },
{ TAG_URL, "aURL" },
{ TAG_FAILOVER, "bFAIL" }, /* XXX 'b' */
{ 0, NULL }
};
/* 2-byte extended tags */
static struct tok xtag2str[] = {
{ 0, NULL }
};
/* DHCP "options overload" types */
static struct tok oo2str[] = {
{ 1, "file" },
{ 2, "sname" },
{ 3, "file+sname" },
{ 0, NULL }
};
/* NETBIOS over TCP/IP node type options */
static struct tok nbo2str[] = {
{ 0x1, "b-node" },
{ 0x2, "p-node" },
{ 0x4, "m-node" },
{ 0x8, "h-node" },
{ 0, NULL }
};
/* ARP Hardware types, for Client-ID option */
static struct tok arp2str[] = {
{ 0x1, "ether" },
{ 0x6, "ieee802" },
{ 0x7, "arcnet" },
{ 0xf, "frelay" },
{ 0x17, "strip" },
{ 0x18, "ieee1394" },
{ 0, NULL }
};
static void
rfc1048_print(register const u_char *bp)
{
register u_int16_t tag;
register u_int len, size;
register const char *cp;
register char c;
int first;
u_int32_t ul;
u_int16_t us;
u_int8_t uc;
printf("\n\t Vendor-rfc1048:");
/* Step over magic cookie */
bp += sizeof(int32_t);
/* Loop while we there is a tag left in the buffer */
while (bp + 1 < snapend) {
tag = *bp++;
if (tag == TAG_PAD)
continue;
if (tag == TAG_END)
return;
if (tag == TAG_EXTENDED_OPTION) {
TCHECK2(*(bp + 1), 2);
tag = EXTRACT_16BITS(bp + 1);
/* XXX we don't know yet if the IANA will
* preclude overlap of 1-byte and 2-byte spaces.
* If not, we need to offset tag after this step.
*/
cp = tok2str(xtag2str, "?xT%u", tag);
} else
cp = tok2str(tag2str, "?T%u", tag);
c = *cp++;
printf("\n\t %s:", cp);
/* Get the length; check for truncation */
if (bp + 1 >= snapend) {
fputs(tstr, stdout);
return;
}
len = *bp++;
if (bp + len >= snapend) {
printf("[|bootp %u]", len);
return;
}
if (tag == TAG_DHCP_MESSAGE && len == 1) {
uc = *bp++;
switch (uc) {
case DHCPDISCOVER: printf("DISCOVER"); break;
case DHCPOFFER: printf("OFFER"); break;
case DHCPREQUEST: printf("REQUEST"); break;
case DHCPDECLINE: printf("DECLINE"); break;
case DHCPACK: printf("ACK"); break;
case DHCPNAK: printf("NACK"); break;
case DHCPRELEASE: printf("RELEASE"); break;
case DHCPINFORM: printf("INFORM"); break;
default: printf("%u", uc); break;
}
continue;
}
if (tag == TAG_PARM_REQUEST) {
first = 1;
while (len-- > 0) {
uc = *bp++;
cp = tok2str(tag2str, "?T%u", uc);
if (!first)
putchar('+');
printf("%s", cp + 1);
first = 0;
}
continue;
}
if (tag == TAG_EXTENDED_REQUEST) {
first = 1;
while (len > 1) {
len -= 2;
us = EXTRACT_16BITS(bp);
bp += 2;
cp = tok2str(xtag2str, "?xT%u", us);
if (!first)
putchar('+');
printf("%s", cp + 1);
first = 0;
}
continue;
}
/* Print data */
size = len;
if (c == '?') {
/* Base default formats for unknown tags on data size */
if (size & 1)
c = 'b';
else if (size & 2)
c = 's';
else
c = 'l';
}
first = 1;
switch (c) {
case 'a':
/* ascii strings */
putchar('"');
if (fn_printn(bp, size, snapend)) {
putchar('"');
goto trunc;
}
putchar('"');
bp += size;
size = 0;
break;
case 'i':
case 'l':
case 'L':
/* ip addresses/32-bit words */
while (size >= sizeof(ul)) {
if (!first)
putchar(',');
ul = EXTRACT_32BITS(bp);
if (c == 'i') {
ul = htonl(ul);
printf("%s", ipaddr_string(&ul));
} else if (c == 'L')
printf("%d", ul);
else
printf("%u", ul);
bp += sizeof(ul);
size -= sizeof(ul);
first = 0;
}
break;
case 'p':
/* IP address pairs */
while (size >= 2*sizeof(ul)) {
if (!first)
putchar(',');
memcpy((char *)&ul, (const char *)bp, sizeof(ul));
printf("(%s:", ipaddr_string(&ul));
bp += sizeof(ul);
memcpy((char *)&ul, (const char *)bp, sizeof(ul));
printf("%s)", ipaddr_string(&ul));
bp += sizeof(ul);
size -= 2*sizeof(ul);
first = 0;
}
break;
case 's':
/* shorts */
while (size >= sizeof(us)) {
if (!first)
putchar(',');
us = EXTRACT_16BITS(bp);
printf("%u", us);
bp += sizeof(us);
size -= sizeof(us);
first = 0;
}
break;
case 'B':
/* boolean */
while (size > 0) {
if (!first)
putchar(',');
switch (*bp) {
case 0:
putchar('N');
break;
case 1:
putchar('Y');
break;
default:
printf("%u?", *bp);
break;
}
++bp;
--size;
first = 0;
}
break;
case 'b':
case 'x':
default:
/* Bytes */
while (size > 0) {
if (!first)
putchar(c == 'x' ? ':' : '.');
if (c == 'x')
printf("%02x", *bp);
else
printf("%u", *bp);
++bp;
--size;
first = 0;
}
break;
case '$':
/* Guys we can't handle with one of the usual cases */
switch (tag) {
case TAG_NETBIOS_NODE:
tag = *bp++;
--size;
fputs(tok2str(nbo2str, NULL, tag), stdout);
break;
case TAG_OPT_OVERLOAD:
tag = *bp++;
--size;
fputs(tok2str(oo2str, NULL, tag), stdout);
break;
case TAG_CLIENT_FQDN:
/* option 81 should be at least 4 bytes long */
if (len < 4) {
printf("ERROR: options 81 len %u < 4 bytes", len);
break;
}
if (*bp++)
printf("[svrreg]");
if (*bp)
printf("%u/%u/", *bp, *(bp+1));
bp += 2;
putchar('"');
if (fn_printn(bp, size - 3, snapend)) {
putchar('"');
goto trunc;
}
putchar('"');
bp += size - 3;
size = 0;
break;
case TAG_CLIENT_ID:
{ int type = *bp++;
size--;
if (type == 0) {
putchar('"');
if (fn_printn(bp, size, snapend)) {
putchar('"');
goto trunc;
}
putchar('"');
bp += size;
size = 0;
break;
} else {
printf("[%s]", tok2str(arp2str, "type-%d", type));
}
while (size > 0) {
if (!first)
putchar(':');
printf("%02x", *bp);
++bp;
--size;
first = 0;
}
break;
}
default:
printf("[unknown special tag %u, size %u]",
tag, size);
bp += size;
size = 0;
break;
}
break;
}
/* Data left over? */
if (size) {
printf("[len %u]", len);
bp += size;
}
}
return;
trunc:
printf("|[rfc1048]");
}
static void
cmu_print(register const u_char *bp)
{
register const struct cmu_vend *cmu;
#define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
if (cmu->m.s_addr != 0) \
printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
printf(" vend-cmu");
cmu = (const struct cmu_vend *)bp;
/* Only print if there are unknown bits */
TCHECK(cmu->v_flags);
if ((cmu->v_flags & ~(VF_SMASK)) != 0)
printf(" F:0x%x", cmu->v_flags);
PRINTCMUADDR(v_dgate, "DG");
PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
PRINTCMUADDR(v_dns1, "NS1");
PRINTCMUADDR(v_dns2, "NS2");
PRINTCMUADDR(v_ins1, "IEN1");
PRINTCMUADDR(v_ins2, "IEN2");
PRINTCMUADDR(v_ts1, "TS1");
PRINTCMUADDR(v_ts2, "TS2");
return;
trunc:
fputs(tstr, stdout);
#undef PRINTCMUADDR
}
|