* 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.
*/
-#define NETDISSECT_REWORKED
+/* \summary: BOOTP and IPv4 DHCP printer */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
* without express or implied warranty.
*/
-
struct bootp {
uint8_t bp_op; /* packet opcode type */
uint8_t bp_htype; /* hardware addr type */
uint8_t bp_vend[64]; /* vendor-specific area */
} UNALIGNED;
-#define BOOTPREPLY 2
-#define BOOTPREQUEST 1
+#define BOOTPREPLY 2
+#define BOOTPREQUEST 1
/*
* Vendor magic cookie (v_magic) for CMU
#define TAG_SLP_SCOPE ((uint8_t) 79)
/* RFC 2937 */
#define TAG_NS_SEARCH ((uint8_t) 117)
+/* RFC 3004 - The User Class Option for DHCP */
+#define TAG_USER_CLASS ((uint8_t) 77)
/* RFC 3011 */
#define TAG_IP4_SUBNET_SELECT ((uint8_t) 118)
/* RFC 3442 */
#define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121)
#define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249)
+/* RFC 5859 - TFTP Server Address Option for DHCPv4 */
+#define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150)
/* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
-#define TAG_USER_CLASS ((uint8_t) 77)
#define TAG_SLP_NAMING_AUTH ((uint8_t) 80)
#define TAG_CLIENT_FQDN ((uint8_t) 81)
#define TAG_AGENT_CIRCUIT ((uint8_t) 82)
#define TAG_CLIENT_GUID ((uint8_t) 97)
#define TAG_LDAP_URL ((uint8_t) 95)
#define TAG_6OVER4 ((uint8_t) 96)
-#define TAG_PRINTER_NAME ((uint8_t) 100)
-#define TAG_MDHCP_SERVER ((uint8_t) 101)
+/* RFC 4833, TZ codes */
+#define TAG_TZ_PCODE ((uint8_t) 100)
+#define TAG_TZ_TCODE ((uint8_t) 101)
#define TAG_IPX_COMPAT ((uint8_t) 110)
#define TAG_NETINFO_PARENT ((uint8_t) 112)
#define TAG_NETINFO_PARENT_TAG ((uint8_t) 113)
#define TAG_FAILOVER ((uint8_t) 115)
#define TAG_EXTENDED_REQUEST ((uint8_t) 126)
#define TAG_EXTENDED_OPTION ((uint8_t) 127)
-
+#define TAG_MUDURL ((uint8_t) 161)
/* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
-#define DHCPDISCOVER 1
-#define DHCPOFFER 2
-#define DHCPREQUEST 3
-#define DHCPDECLINE 4
-#define DHCPACK 5
-#define DHCPNAK 6
-#define DHCPRELEASE 7
-#define DHCPINFORM 8
-
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+#define DHCPINFORM 8
/*
* "vendor" data permitted for CMU bootp clients.
static char *client_fqdn_flags(u_int flags);
static const struct tok bootp_flag_values[] = {
- { 0x8000, "Broadcast" },
- { 0, NULL}
+ { 0x8000, "Broadcast" },
+ { 0, NULL}
};
static const struct tok bootp_op_values[] = {
- { BOOTPREQUEST, "Request" },
- { BOOTPREPLY, "Reply" },
- { 0, NULL}
+ { BOOTPREQUEST, "Request" },
+ { BOOTPREPLY, "Reply" },
+ { 0, NULL}
};
/*
*/
void
bootp_print(netdissect_options *ndo,
- register const u_char *cp, u_int length)
+ register const u_char *cp, u_int length)
{
register const struct bootp *bp;
static const u_char vm_cmu[4] = VM_CMU;
ND_TCHECK(bp->bp_op);
ND_PRINT((ndo, "BOOTP/DHCP, %s",
- tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
+ tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
+ ND_TCHECK(bp->bp_hlen);
if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
ND_TCHECK2(bp->bp_chaddr[0], 6);
ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr)));
if (EXTRACT_16BITS(&bp->bp_secs))
ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs)));
+ ND_TCHECK(bp->bp_flags);
ND_PRINT((ndo, ", Flags [%s]",
- bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
+ bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
if (ndo->ndo_vflag > 1)
ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)));
ND_TCHECK2(bp->bp_sname[0], 1); /* check first char only */
if (*bp->bp_sname) {
ND_PRINT((ndo, "\n\t sname \""));
- if (fn_print(ndo, bp->bp_sname, ndo->ndo_snapend)) {
+ if (fn_printztn(ndo, bp->bp_sname, (u_int)sizeof bp->bp_sname,
+ ndo->ndo_snapend) == 0) {
ND_PRINT((ndo, "\""));
ND_PRINT((ndo, "%s", tstr + 1));
return;
ND_TCHECK2(bp->bp_file[0], 1); /* check first char only */
if (*bp->bp_file) {
ND_PRINT((ndo, "\n\t file \""));
- if (fn_print(ndo, bp->bp_file, ndo->ndo_snapend)) {
+ if (fn_printztn(ndo, bp->bp_file, (u_int)sizeof bp->bp_file,
+ ndo->ndo_snapend) == 0) {
ND_PRINT((ndo, "\""));
ND_PRINT((ndo, "%s", tstr + 1));
return;
}
/* Decode the vendor buffer */
- ND_TCHECK(bp->bp_vend[0]);
+ ND_TCHECK2(bp->bp_vend[0], 4);
if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
- sizeof(uint32_t)) == 0)
+ sizeof(uint32_t)) == 0)
rfc1048_print(ndo, bp->bp_vend);
else if (memcmp((const char *)bp->bp_vend, vm_cmu,
- sizeof(uint32_t)) == 0)
+ sizeof(uint32_t)) == 0)
cmu_print(ndo, bp->bp_vend);
else {
uint32_t ul;
+ ND_TCHECK_32BITS(&bp->bp_vend);
ul = EXTRACT_32BITS(&bp->bp_vend);
if (ul != 0)
ND_PRINT((ndo, "\n\t Vendor-#0x%x", ul));
{ TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */
/* RFC 2937 */
{ TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */
+/* RFC 3004 - The User Class Option for DHCP */
+ { TAG_USER_CLASS, "$User-Class" },
/* RFC 3011 */
{ TAG_IP4_SUBNET_SELECT, "iSUBNET" },
/* RFC 3442 */
{ TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
{ TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
+/* RFC 5859 - TFTP Server Address Option for DHCPv4 */
+ { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
/* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
- { TAG_USER_CLASS, "aCLASS" },
{ TAG_SLP_NAMING_AUTH, "aSLP-NA" },
{ TAG_CLIENT_FQDN, "$FQDN" },
{ TAG_AGENT_CIRCUIT, "$Agent-Information" },
{ TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */
{ TAG_LDAP_URL, "aLDAP" },
{ TAG_6OVER4, "i6o4" },
- { TAG_PRINTER_NAME, "aPRTR" },
- { TAG_MDHCP_SERVER, "bMDHCP" }, /* XXX 'b' */
+ { TAG_TZ_PCODE, "aPOSIX-TZ" },
+ { TAG_TZ_TCODE, "aTZ-Name" },
{ 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 }
+ { TAG_MUDURL, "aMUD-URL" },
+ { 0, NULL }
};
/* 2-byte extended tags */
static const struct tok xtag2str[] = {
- { 0, NULL }
+ { 0, NULL }
};
/* DHCP "options overload" types */
static const struct tok oo2str[] = {
- { 1, "file" },
- { 2, "sname" },
- { 3, "file+sname" },
- { 0, NULL }
+ { 1, "file" },
+ { 2, "sname" },
+ { 3, "file+sname" },
+ { 0, NULL }
};
/* NETBIOS over TCP/IP node type options */
static const struct tok nbo2str[] = {
- { 0x1, "b-node" },
- { 0x2, "p-node" },
- { 0x4, "m-node" },
- { 0x8, "h-node" },
- { 0, NULL }
+ { 0x1, "b-node" },
+ { 0x2, "p-node" },
+ { 0x4, "m-node" },
+ { 0x8, "h-node" },
+ { 0, NULL }
};
/* ARP Hardware types, for Client-ID option */
static const struct tok arp2str[] = {
- { 0x1, "ether" },
- { 0x6, "ieee802" },
- { 0x7, "arcnet" },
- { 0xf, "frelay" },
- { 0x17, "strip" },
- { 0x18, "ieee1394" },
- { 0, NULL }
+ { 0x1, "ether" },
+ { 0x6, "ieee802" },
+ { 0x7, "arcnet" },
+ { 0xf, "frelay" },
+ { 0x17, "strip" },
+ { 0x18, "ieee1394" },
+ { 0, NULL }
};
static const struct tok dhcp_msg_values[] = {
- { DHCPDISCOVER, "Discover" },
- { DHCPOFFER, "Offer" },
- { DHCPREQUEST, "Request" },
- { DHCPDECLINE, "Decline" },
- { DHCPACK, "ACK" },
- { DHCPNAK, "NACK" },
- { DHCPRELEASE, "Release" },
- { DHCPINFORM, "Inform" },
- { 0, NULL }
+ { DHCPDISCOVER, "Discover" },
+ { DHCPOFFER, "Offer" },
+ { DHCPREQUEST, "Request" },
+ { DHCPDECLINE, "Decline" },
+ { DHCPACK, "ACK" },
+ { DHCPNAK, "NACK" },
+ { DHCPRELEASE, "Release" },
+ { DHCPINFORM, "Inform" },
+ { 0, NULL }
};
-#define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */
-#define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */
-#define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */
+#define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */
+#define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */
+#define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */
static const struct tok agent_suboption_values[] = {
- { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
- { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
- { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
- { 0, NULL }
+ { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
+ { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
+ { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
+ { 0, NULL }
};
static void
rfc1048_print(netdissect_options *ndo,
- register const u_char *bp)
+ register const u_char *bp)
{
register uint16_t tag;
register u_int len;
}
ND_PRINT((ndo, "\n\t %s Option %u, length %u%s", cp, tag, len,
- len > 0 ? ": " : ""));
+ len > 0 ? ": " : ""));
if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
u_int ntag = 1;
case TAG_NETBIOS_NODE:
/* this option should be at least 1 byte long */
- if (len < 1) {
- ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
- TAG_NETBIOS_NODE, len));
+ if (len < 1) {
+ ND_PRINT((ndo, "ERROR: length < 1 bytes"));
break;
}
tag = *bp++;
case TAG_OPT_OVERLOAD:
/* this option should be at least 1 byte long */
- if (len < 1) {
- ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
- TAG_OPT_OVERLOAD, len));
+ if (len < 1) {
+ ND_PRINT((ndo, "ERROR: length < 1 bytes"));
break;
}
tag = *bp++;
case TAG_CLIENT_FQDN:
/* this option should be at least 3 bytes long */
- if (len < 3) {
- ND_PRINT((ndo, "ERROR: option %u len %u < 3 bytes",
- TAG_CLIENT_FQDN, len));
+ if (len < 3) {
+ ND_PRINT((ndo, "ERROR: length < 3 bytes"));
bp += len;
len = 0;
break;
break;
case TAG_CLIENT_ID:
- { int type;
+ {
+ int type;
/* this option should be at least 1 byte long */
- if (len < 1) {
- ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
- TAG_CLIENT_ID, len));
+ if (len < 1) {
+ ND_PRINT((ndo, "ERROR: length < 1 bytes"));
break;
}
type = *bp++;
len -= 2;
if (suboptlen > len) {
ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: length goes past end of option",
- tok2str(agent_suboption_values, "Unknown", subopt),
- subopt,
- suboptlen));
+ tok2str(agent_suboption_values, "Unknown", subopt),
+ subopt,
+ suboptlen));
bp += len;
len = 0;
break;
}
ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: ",
- tok2str(agent_suboption_values, "Unknown", subopt),
- subopt,
- suboptlen));
+ tok2str(agent_suboption_values, "Unknown", subopt),
+ subopt,
+ suboptlen));
switch (subopt) {
case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
case AGENT_SUBOPTION_REMOTE_ID:
case AGENT_SUBOPTION_SUBSCRIBER_ID:
- fn_printn(ndo, bp, suboptlen, NULL);
+ if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
+ goto trunc;
break;
default:
len -= suboptlen;
bp += suboptlen;
- }
- break;
+ }
+ break;
case TAG_CLASSLESS_STATIC_RT:
case TAG_CLASSLESS_STA_RT_MS:
- {
+ {
u_int mask_width, significant_octets, i;
/* this option should be at least 5 bytes long */
- if (len < 5) {
- ND_PRINT((ndo, "ERROR: option %u len %u < 5 bytes",
- TAG_CLASSLESS_STATIC_RT, len));
+ if (len < 5) {
+ ND_PRINT((ndo, "ERROR: length < 5 bytes"));
bp += len;
len = 0;
break;
len--;
/* mask_width <= 32 */
if (mask_width > 32) {
- ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
+ ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
bp += len;
len = 0;
break;
significant_octets = (mask_width + 7) / 8;
/* significant octets + router(4) */
if (len < significant_octets + 4) {
- ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
+ ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
bp += len;
len = 0;
break;
len -= (significant_octets + 4);
first = 0;
}
- }
- break;
+ break;
+ }
+
+ case TAG_USER_CLASS:
+ {
+ u_int suboptnumber = 1;
+
+ first = 1;
+ if (len < 2) {
+ ND_PRINT((ndo, "ERROR: length < 2 bytes"));
+ bp += len;
+ len = 0;
+ break;
+ }
+ while (len > 0) {
+ suboptlen = *bp++;
+ len--;
+ ND_PRINT((ndo, "\n\t "));
+ ND_PRINT((ndo, "instance#%u: ", suboptnumber));
+ if (suboptlen == 0) {
+ ND_PRINT((ndo, "ERROR: suboption length must be non-zero"));
+ bp += len;
+ len = 0;
+ break;
+ }
+ if (len < suboptlen) {
+ ND_PRINT((ndo, "ERROR: invalid option"));
+ bp += len;
+ len = 0;
+ break;
+ }
+ ND_PRINT((ndo, "\""));
+ if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
+ ND_PRINT((ndo, "\""));
+ goto trunc;
+ }
+ ND_PRINT((ndo, "\""));
+ ND_PRINT((ndo, ", length %d", suboptlen));
+ suboptnumber++;
+ len -= suboptlen;
+ bp += suboptlen;
+ }
+ break;
+ }
default:
ND_PRINT((ndo, "[unknown special tag %u, size %u]",
- tag, len));
+ tag, len));
bp += len;
len = 0;
break;
static void
cmu_print(netdissect_options *ndo,
- register const u_char *bp)
+ register const u_char *bp)
{
register const struct cmu_vend *cmu;
projects / tcpdump / blobdiff