OpenBSD-4.6/usr.sbin/tcpdump/print-bootp.c
/* $OpenBSD: print-bootp.c,v 1.16 2007/10/07 16:41:05 deraadt Exp $ */
/*
* 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[] =
"@(#) $Id: print-bootp.c,v 1.16 2007/10/07 16:41:05 deraadt Exp $ (LBL)";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
struct mbuf;
struct rtentry;
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <ctype.h>
#include <memory.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "bootp.h"
static void rfc1048_print(const u_char *, u_int);
static void cmu_print(const u_char *, u_int);
static char tstr[] = " [|bootp]";
/*
* Print bootp requests
*/
void
bootp_print(register const u_char *cp, u_int length,
u_short sport, u_short dport)
{
register const struct bootp *bp;
static u_char vm_cmu[4] = VM_CMU;
static u_char vm_rfc1048[4] = VM_RFC1048;
bp = (struct bootp *)cp;
TCHECK(bp->bp_op);
switch (bp->bp_op) {
case BOOTREQUEST:
/* Usually, a request goes from a client to a server */
if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
printf(" (request)");
break;
case BOOTREPLY:
/* Usually, a reply goes from a server to a client */
if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
printf(" (reply)");
break;
default:
printf(" bootp-#%d", bp->bp_op);
}
TCHECK(bp->bp_flags);
/* 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", (u_int32_t)ntohl(bp->bp_xid));
if (bp->bp_secs)
printf(" secs:%d", ntohs(bp->bp_secs));
if (bp->bp_flags)
printf(" flags:0x%x", ntohs(bp->bp_flags));
/* Client's ip address */
TCHECK(bp->bp_ciaddr);
if (bp->bp_ciaddr.s_addr)
printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
/* 'your' ip address (bootp client) */
TCHECK(bp->bp_yiaddr);
if (bp->bp_yiaddr.s_addr)
printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
/* Server's ip address */
TCHECK(bp->bp_siaddr);
if (bp->bp_siaddr.s_addr)
printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
/* Gateway's ip address */
TCHECK(bp->bp_giaddr);
if (bp->bp_giaddr.s_addr)
printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
/* Client's Ethernet address */
if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
register const struct ether_header *eh;
register const char *e;
TCHECK2(bp->bp_chaddr[0], 6);
eh = (struct ether_header *)packetp;
if (bp->bp_op == BOOTREQUEST)
e = (const char *)ESRC(eh);
else if (bp->bp_op == BOOTREPLY)
e = (const char *)EDST(eh);
else
e = 0;
if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0)
printf(" ether %s", etheraddr_string(bp->bp_chaddr));
}
TCHECK2(bp->bp_sname[0], 1); /* check first char only */
if (*bp->bp_sname) {
printf(" 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(" file \"");
if (fn_print(bp->bp_file, snapend)) {
putchar('"');
fputs(tstr + 1, stdout);
return;
}
putchar('"');
}
/* Decode the vendor buffer */
TCHECK2(bp->bp_vend[0], sizeof(u_int32_t));
length -= sizeof(*bp) - sizeof(bp->bp_vend);
if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048,
sizeof(u_int32_t)) == 0)
rfc1048_print(bp->bp_vend, length);
else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu,
sizeof(u_int32_t)) == 0)
cmu_print(bp->bp_vend, length);
else {
u_int32_t ul;
memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul));
if (ul != 0)
printf("vend-#0x%x", ul);
}
return;
trunc:
fputs(tstr, stdout);
}
/* The first character specifies the format to print */
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, "bWNT" },
{ 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, "bOO" },
{ 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, "bVC" },
{ TAG_CLIENT_ID, "bCID" },
{ 0, NULL }
};
static void
rfc1048_print(register const u_char *bp, register u_int length)
{
register u_char tag;
register u_int len, size;
register const char *cp;
register u_char c;
int first;
u_int32_t ul;
u_short us;
printf(" vend-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;
cp = tok2str(tag2str, "?T%d", tag);
c = *cp++;
printf(" %s:", cp);
/* Get the length; check for truncation */
if (bp + 1 >= snapend) {
fputs(tstr, stdout);
return;
}
len = *bp++;
if (bp + len >= snapend) {
fputs(tstr, stdout);
return;
}
if (tag == TAG_DHCP_MESSAGE && len == 1) {
c = *bp++;
switch (c) {
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", c); break;
}
continue;
}
if (tag == TAG_PARM_REQUEST) {
first = 1;
while (len-- > 0) {
c = *bp++;
cp = tok2str(tag2str, "?%d", c);
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('"');
(void)fn_printn(bp, size, NULL);
putchar('"');
bp += size;
size = 0;
break;
case 'i':
case 'l':
/* ip addresses/32-bit words */
while (size >= sizeof(ul)) {
if (!first)
putchar(',');
memcpy((char *)&ul, (char *)bp, sizeof(ul));
if (c == 'i')
printf("%s", ipaddr_string(&ul));
else
printf("%u", ntohl(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, (char *)bp, sizeof(ul));
printf("(%s:", ipaddr_string(&ul));
bp += sizeof(ul);
memcpy((char *)&ul, (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(',');
memcpy((char *)&us, (char *)bp, sizeof(us));
printf("%u", ntohs(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("%d?", *bp);
break;
}
++bp;
--size;
first = 0;
}
break;
case 'b':
default:
/* Bytes */
while (size > 0) {
if (!first)
putchar('.');
printf("%d", *bp);
++bp;
--size;
first = 0;
}
break;
}
/* Data left over? */
if (size)
printf("[len %d]", len);
}
}
static void
cmu_print(register const u_char *bp, register u_int length)
{
register const struct cmu_vend *cmu;
char *fmt = " %s:%s";
#define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
if (cmu->m.s_addr != 0) \
printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); }
printf(" vend-cmu");
cmu = (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
}