diff options
Diffstat (limited to 'usr.sbin/tcpdump')
| -rw-r--r-- | usr.sbin/tcpdump/nameser.h | 274 | ||||
| -rw-r--r-- | usr.sbin/tcpdump/print-domain.c | 506 |
2 files changed, 603 insertions, 177 deletions
diff --git a/usr.sbin/tcpdump/nameser.h b/usr.sbin/tcpdump/nameser.h new file mode 100644 index 00000000000..b416a562073 --- /dev/null +++ b/usr.sbin/tcpdump/nameser.h @@ -0,0 +1,274 @@ +/* @(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/nameser.h,v 1.1 2001/03/05 22:40:10 jakob Exp $ (LBL) */ +/* + * Copyright (c) 1983, 1989, 1993 + * 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 the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)nameser.h 8.2 (Berkeley) 2/16/94 + * - + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * - + * --Copyright-- + */ + +#ifndef _NAMESER_H_ +#define _NAMESER_H_ + +#include <sys/types.h> + +/* + * Define constants based on rfc883 + */ +#define PACKETSZ 512 /* maximum packet size */ +#define MAXDNAME 256 /* maximum domain name */ +#define MAXCDNAME 255 /* maximum compressed domain name */ +#define MAXLABEL 63 /* maximum length of domain label */ + /* Number of bytes of fixed size data in query structure */ +#define QFIXEDSZ 4 + /* number of bytes of fixed size data in resource record */ +#define RRFIXEDSZ 10 + +/* + * Internet nameserver port number + */ +#define NAMESERVER_PORT 53 + +/* + * Currently defined opcodes + */ +#define QUERY 0x0 /* standard query */ +#define IQUERY 0x1 /* inverse query */ +#define STATUS 0x2 /* nameserver status query */ +#if 0 +#define xxx 0x3 /* 0x3 reserved */ +#endif + /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ +#define UPDATEA 0x9 /* add resource record */ +#define UPDATED 0xa /* delete a specific resource record */ +#define UPDATEDA 0xb /* delete all named resource record */ +#define UPDATEM 0xc /* modify a specific resource record */ +#define UPDATEMA 0xd /* modify all named resource record */ + +#define ZONEINIT 0xe /* initial zone transfer */ +#define ZONEREF 0xf /* incremental zone referesh */ + +/* + * Currently defined response codes + */ +#define NOERROR 0 /* no error */ +#define FORMERR 1 /* format error */ +#define SERVFAIL 2 /* server failure */ +#define NXDOMAIN 3 /* non existent domain */ +#define NOTIMP 4 /* not implemented */ +#define REFUSED 5 /* query refused */ + /* non standard */ +#define NOCHANGE 0xf /* update failed to change db */ + +/* + * Type values for resources and queries + */ +#define T_A 1 /* host address */ +#define T_NS 2 /* authoritative server */ +#define T_MD 3 /* mail destination */ +#define T_MF 4 /* mail forwarder */ +#define T_CNAME 5 /* connonical name */ +#define T_SOA 6 /* start of authority zone */ +#define T_MB 7 /* mailbox domain name */ +#define T_MG 8 /* mail group member */ +#define T_MR 9 /* mail rename name */ +#define T_NULL 10 /* null resource record */ +#define T_WKS 11 /* well known service */ +#define T_PTR 12 /* domain name pointer */ +#define T_HINFO 13 /* host information */ +#define T_MINFO 14 /* mailbox information */ +#define T_MX 15 /* mail routing information */ +#define T_TXT 16 /* text strings */ +#define T_RP 17 /* responsible person */ +#define T_AFSDB 18 /* AFS cell database */ +#define T_X25 19 /* X_25 calling address */ +#define T_ISDN 20 /* ISDN calling address */ +#define T_RT 21 /* router */ +#define T_NSAP 22 /* NSAP address */ +#define T_NSAP_PTR 23 /* reverse lookup for NSAP */ +#define T_SIG 24 /* security signature */ +#define T_KEY 25 /* security key */ +#define T_PX 26 /* X.400 mail mapping */ +#define T_GPOS 27 /* geographical position (withdrawn) */ +#define T_AAAA 28 /* IP6 Address */ +#define T_LOC 29 /* Location Information */ +#define T_NXT 30 /* Next Valid Name in Zone */ +#define T_EID 31 /* Endpoint identifier */ +#define T_NIMLOC 32 /* Nimrod locator */ +#define T_SRV 33 /* Server selection */ +#define T_ATMA 34 /* ATM Address */ +#define T_NAPTR 35 /* Naming Authority PoinTeR */ +#define T_CERT 37 /* certificate */ +#define T_A6 38 /* IP6 address */ +#define T_DNAME 39 /* non-terminal redirection */ +#define T_OPT 41 /* EDNS0 option (meta-RR) */ + /* non standard */ +#define T_UINFO 100 /* user (finger) information */ +#define T_UID 101 /* user ID */ +#define T_GID 102 /* group ID */ +#define T_UNSPEC 103 /* Unspecified format (binary data) */ +#define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ + /* Query type values which do not appear in resource records */ +#define T_AXFR 252 /* transfer zone of authority */ +#define T_MAILB 253 /* transfer mailbox records */ +#define T_MAILA 254 /* transfer mail agent records */ +#define T_ANY 255 /* wildcard match */ + +/* + * Values for class field + */ + +#define C_IN 1 /* the arpa internet */ +#define C_CHAOS 3 /* for chaos net (MIT) */ +#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ + /* Query class values which do not appear in resource records */ +#define C_ANY 255 /* wildcard match */ + +/* + * Status return codes for T_UNSPEC conversion routines + */ +#define CONV_SUCCESS 0 +#define CONV_OVERFLOW -1 +#define CONV_BADFMT -2 +#define CONV_BADCKSUM -3 +#define CONV_BADBUFLEN -4 + +/* + * Structure for query header. + */ +typedef struct { + u_int16_t id; /* query identification number */ + u_int8_t flags1; /* first byte of flags */ + u_int8_t flags2; /* second byte of flags */ + u_int16_t qdcount; /* number of question entries */ + u_int16_t ancount; /* number of answer entries */ + u_int16_t nscount; /* number of authority entries */ + u_int16_t arcount; /* number of resource entries */ +} HEADER; + +/* + * Macros for subfields of flag fields. + */ +#define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ +#define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ +#define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ +#define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ +#define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ + +#define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ +#define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ +#define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ +#define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ + +/* + * Defines for handling compressed domain names, EDNS0 labels, etc. + */ +#define INDIR_MASK 0xc0 /* 11.... */ +#define EDNS0_MASK 0x40 /* 01.... */ +# define EDNS0_ELT_BITLABEL 0x01 + +/* + * Structure for passing resource records around. + */ +struct rrec { + int16_t r_zone; /* zone number */ + int16_t r_class; /* class number */ + int16_t r_type; /* type number */ + u_int32_t r_ttl; /* time to live */ + int r_size; /* size of data area */ + char *r_data; /* pointer to data */ +}; + +/* + * Inline versions of get/put short/long. Pointer is advanced. + * We also assume that a "u_int16_t" holds 2 "chars" + * and that a "u_int32_t" holds 4 "chars". + * + * These macros demonstrate the property of C whereby it can be + * portable or it can be elegant but never both. + */ +#define GETSHORT(s, cp) { \ + register u_char *t_cp = (u_char *)(cp); \ + (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ + (cp) += 2; \ +} + +#define GETLONG(l, cp) { \ + register u_char *t_cp = (u_char *)(cp); \ + (l) = (((u_int32_t)t_cp[0]) << 24) \ + | (((u_int32_t)t_cp[1]) << 16) \ + | (((u_int32_t)t_cp[2]) << 8) \ + | (((u_int32_t)t_cp[3])); \ + (cp) += 4; \ +} + +#define PUTSHORT(s, cp) { \ + register u_int16_t t_s = (u_int16_t)(s); \ + register u_char *t_cp = (u_char *)(cp); \ + *t_cp++ = t_s >> 8; \ + *t_cp = t_s; \ + (cp) += 2; \ +} + +/* + * Warning: PUTLONG --no-longer-- destroys its first argument. if you + * were depending on this "feature", you will lose. + */ +#define PUTLONG(l, cp) { \ + register u_int32_t t_l = (u_int32_t)(l); \ + register u_char *t_cp = (u_char *)(cp); \ + *t_cp++ = t_l >> 24; \ + *t_cp++ = t_l >> 16; \ + *t_cp++ = t_l >> 8; \ + *t_cp = t_l; \ + (cp) += 4; \ +} + +#endif /* !_NAMESER_H_ */ diff --git a/usr.sbin/tcpdump/print-domain.c b/usr.sbin/tcpdump/print-domain.c index c45ffe74e14..2e6d432bec0 100644 --- a/usr.sbin/tcpdump/print-domain.c +++ b/usr.sbin/tcpdump/print-domain.c @@ -1,4 +1,4 @@ -/* $OpenBSD: print-domain.c,v 1.11 2000/10/03 14:31:56 ho Exp $ */ +/* $OpenBSD: print-domain.c,v 1.12 2001/03/05 22:40:11 jakob Exp $ */ /* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 @@ -23,17 +23,13 @@ #ifndef lint static const char rcsid[] = - "@(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/print-domain.c,v 1.11 2000/10/03 14:31:56 ho Exp $ (LBL)"; + "@(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/print-domain.c,v 1.12 2001/03/05 22:40:11 jakob Exp $ (LBL)"; #endif #include <sys/param.h> #include <sys/time.h> #include <sys/socket.h> -#ifdef __STDC__ -struct mbuf; -struct rtentry; -#endif #include <net/if.h> #include <netinet/in.h> @@ -51,7 +47,7 @@ struct rtentry; #ifdef NOERROR #undef T_UNSPEC /* SINIX does too */ #endif -#include <arpa/nameser.h> +#include "nameser.h" #include <stdio.h> #include <string.h> @@ -60,85 +56,6 @@ struct rtentry; #include "addrtoname.h" #include "extract.h" /* must come after interface.h */ -/* Compatibility */ -#ifndef T_TXT -#define T_TXT 16 /* text strings */ -#endif -#ifndef T_RP -#define T_RP 17 /* responsible person */ -#endif -#ifndef T_AFSDB -#define T_AFSDB 18 /* AFS cell database */ -#endif -#ifndef T_X25 -#define T_X25 19 /* X_25 calling address */ -#endif -#ifndef T_ISDN -#define T_ISDN 20 /* ISDN calling address */ -#endif -#ifndef T_RT -#define T_RT 21 /* router */ -#endif -#ifndef T_NSAP -#define T_NSAP 22 /* NSAP address */ -#endif -#ifndef T_NSAP_PTR -#define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */ -#endif -#ifndef T_SIG -#define T_SIG 24 /* security signature */ -#endif -#ifndef T_KEY -#define T_KEY 25 /* security key */ -#endif -#ifndef T_PX -#define T_PX 26 /* X.400 mail mapping */ -#endif -#ifndef T_GPOS -#define T_GPOS 27 /* geographical position (withdrawn) */ -#endif -#ifndef T_AAAA -#define T_AAAA 28 /* IP6 Address */ -#endif -#ifndef T_LOC -#define T_LOC 29 /* Location Information */ -#endif -#ifndef T_NXT -#define T_NXT 30 /* Next Valid Name in Zone */ -#endif -#ifndef T_EID -#define T_EID 31 /* Endpoint identifier */ -#endif -#ifndef T_NIMLOC -#define T_NIMLOC 32 /* Nimrod locator */ -#endif -#ifndef T_SRV -#define T_SRV 33 /* Server selection */ -#endif -#ifndef T_ATMA -#define T_ATMA 34 /* ATM Address */ -#endif -#ifndef T_NAPTR -#define T_NAPTR 35 /* Naming Authority PoinTeR */ -#endif -#ifndef T_A6 -#define T_A6 38 /* IP6 address (ipngwg-dns-lookups) */ -#endif - -#ifndef T_UNSPEC -#define T_UNSPEC 103 /* Unspecified format (binary data) */ -#endif -#ifndef T_UNSPECA -#define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ -#endif - -#ifndef C_CHAOS -#define C_CHAOS 3 /* for chaos net (MIT) */ -#endif -#ifndef C_HS -#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ -#endif - static char *ns_ops[] = { "", " inv_q", " stat", " op3", " notify", " op5", " op6", " op7", " op8", " updataA", " updateD", " updateDA", @@ -160,8 +77,22 @@ ns_nskip(register const u_char *cp, register const u_char *bp) if (((i = *cp++) & INDIR_MASK) == INDIR_MASK) return (cp + 1); + if (cp >= snapend) + return(NULL); while (i && cp < snapend) { - cp += i; + if ((i & INDIR_MASK) == EDNS0_MASK) { + int bitlen, bytelen; + + if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL) + return(NULL); /* unknown ELT */ + if ((bitlen = *cp++) == 0) + bitlen = 256; + bytelen = (bitlen + 7) / 8; + cp += bytelen; + } else + cp += i; + if (cp >= snapend) + return(NULL); i = *cp++; } return (cp); @@ -169,26 +100,95 @@ ns_nskip(register const u_char *cp, register const u_char *bp) /* print a <domain-name> */ static const u_char * -ns_nprint(register const u_char *cp, register const u_char *bp) +blabel_print(const u_char *cp) +{ + int bitlen, slen, b; + int truncated = 0; + const u_char *bitp, *lim; + char tc; + + if (cp >= snapend) + return(NULL); + if ((bitlen = *cp) == 0) + bitlen = 256; + slen = (bitlen + 3) / 4; + if ((lim = cp + 1 + slen) > snapend) { + truncated = 1; + lim = snapend; + } + + /* print the bit string as a hex string */ + printf("\\[x"); + for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) + printf("%02x", *bitp); + if (bitp == lim) + printf("..."); + else if (b > 4) { + tc = *bitp++; + printf("%02x", tc & (0xff << (8 - b))); + } else if (b > 0) { + tc = *bitp++; + printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b))); + } + printf("/%d]", bitlen); + + return(truncated ? NULL : lim); +} + +static int +labellen(const u_char *cp) { register u_int i; - register const u_char *rp; - register int compress; + + if (cp >= snapend) + return(-1); + i = *cp; + if ((i & INDIR_MASK) == EDNS0_MASK) { + int bitlen, elt; + + if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) + return(-1); + if (cp + 1 >= snapend) + return(-1); + if ((bitlen = *(cp + 1)) == 0) + bitlen = 256; + return(((bitlen + 7) / 8) + 1); + } else + return(i); +} + +static const u_char * +ns_nprint(register const u_char *cp, register const u_char *bp) +{ + register u_int i, l; + register const u_char *rp = NULL; + register int compress = 0; int chars_processed; + int elt; int data_size = snapend - bp; - i = *cp++; + if ((l = labellen(cp)) < 0) + return(NULL); + if (cp >= snapend) + return(NULL); chars_processed = 1; - rp = cp + i; - if ((i & INDIR_MASK) == INDIR_MASK) { - rp = cp + 1; - compress = 1; - } else + if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) { compress = 0; + rp = cp + l; + } + if (i != 0) while (i && cp < snapend) { if ((i & INDIR_MASK) == INDIR_MASK) { + if (!compress) { + rp = cp + 1; + compress = 1; + } cp = bp + (((i << 8) | *cp) & 0x3fff); + if (cp >= snapend) + return(NULL); + if ((l = labellen(cp)) < 0) + return(NULL); i = *cp++; chars_processed++; @@ -199,22 +199,36 @@ ns_nprint(register const u_char *cp, register const u_char *bp) * which means we're looping. */ if (chars_processed >= data_size) { - fn_printn(cp, 6, "<LOOP>"); - if (!compress) - rp += i + 1; - return (rp); + printf("<LOOP>"); + return (NULL); } continue; } - if (fn_printn(cp, i, snapend)) - break; - cp += i; - chars_processed += i; + if ((i & INDIR_MASK) == EDNS0_MASK) { + elt = (i & ~INDIR_MASK); + switch(elt) { + case EDNS0_ELT_BITLABEL: + blabel_print(cp); + break; + default: + /* unknown ELT */ + printf("<ELT %d>", elt); + return(NULL); + } + } else { + if (fn_printn(cp, l, snapend)) + break; + } + + cp += l; + chars_processed += l; putchar('.'); + if (cp >= snapend || (l = labellen(cp)) < 0) + return(NULL); i = *cp++; chars_processed++; if (!compress) - rp += i + 1; + rp += l + 1; } else putchar('.'); @@ -227,12 +241,14 @@ ns_cprint(register const u_char *cp, register const u_char *bp) { register u_int i; + if (cp >= snapend) + return NULL; i = *cp++; (void)fn_printn(cp, i, snapend); return (cp + i); } -static struct tok type2str[] = { +struct tok ns_type2str[] = { { T_A, "A" }, { T_NS, "NS" }, { T_MD, "MD" }, @@ -261,25 +277,19 @@ static struct tok type2str[] = { { T_PX, "PX" }, { T_GPOS, "GPOS" }, { T_AAAA, "AAAA" }, - { T_LOC, "LOC " }, - { T_NXT, "NXT " }, - { T_EID, "EID " }, - { T_NIMLOC, "NIMLOC " }, - { T_SRV, "SRV " }, - { T_ATMA, "ATMA " }, - { T_NAPTR, "NAPTR " }, - { T_A6, "A6 " }, -#ifndef T_UINFO -#define T_UINFO 100 -#endif + { T_LOC, "LOC" }, + { T_NXT, "NXT" }, + { T_EID, "EID" }, + { T_NIMLOC, "NIMLOC" }, + { T_SRV, "SRV" }, + { T_ATMA, "ATMA" }, + { T_NAPTR, "NAPTR" }, + { T_CERT, "CERT" }, + { T_A6, "A6" }, + { T_DNAME, "DNAME" }, + { T_OPT, "OPT" }, { T_UINFO, "UINFO" }, -#ifndef T_UID -#define T_UID 101 -#endif { T_UID, "UID" }, -#ifndef T_GID -#define T_GID 102 -#endif { T_GID, "GID" }, { T_UNSPEC, "UNSPEC" }, { T_UNSPECA, "UNSPECA" }, @@ -290,16 +300,16 @@ static struct tok type2str[] = { { 0, NULL } }; -static struct tok class2str[] = { +struct tok ns_class2str[] = { { C_IN, "IN" }, /* Not used */ - { C_CHAOS, "CHAOS)" }, + { C_CHAOS, "CHAOS" }, { C_HS, "HS" }, { C_ANY, "ANY" }, { 0, NULL } }; /* print a query */ -static void +static const u_char * ns_qprint(register const u_char *cp, register const u_char *bp) { register const u_char *np = cp; @@ -307,46 +317,48 @@ ns_qprint(register const u_char *cp, register const u_char *bp) cp = ns_nskip(cp, bp); - if (cp + 4 > snapend) - return; + if (cp + 4 > snapend || cp == NULL) + return(NULL); /* print the qtype and qclass (if it's not IN) */ i = *cp++ << 8; i |= *cp++; - printf(" %s", tok2str(type2str, "Type%d", i)); + printf(" %s", tok2str(ns_type2str, "Type%d", i)); i = *cp++ << 8; i |= *cp++; if (i != C_IN) - printf(" %s", tok2str(class2str, "(Class %d)", i)); + printf(" %s", tok2str(ns_class2str, "(Class %d)", i)); fputs("? ", stdout); - ns_nprint(np, bp); + cp = ns_nprint(np, bp); + return(cp ? cp + 4 : NULL); } /* print a reply */ static const u_char * ns_rprint(register const u_char *cp, register const u_char *bp) { - register u_int i; + register u_int class; register u_short typ, len; register const u_char *rp; if (vflag) { putchar(' '); - cp = ns_nprint(cp, bp); + if ((cp = ns_nprint(cp, bp)) == NULL) + return NULL; } else cp = ns_nskip(cp, bp); - if (cp + 10 > snapend) + if (cp + 10 > snapend || cp == NULL) return (snapend); /* print the type/qtype and class (if it's not IN) */ typ = *cp++ << 8; typ |= *cp++; - i = *cp++ << 8; - i |= *cp++; - if (i != C_IN) - printf(" %s", tok2str(class2str, "(Class %d)", i)); + class = *cp++ << 8; + class |= *cp++; + if (class != C_IN && typ != T_OPT) + printf(" %s", tok2str(ns_class2str, "(Class %d)", class)); /* ignore ttl */ cp += 4; @@ -356,10 +368,14 @@ ns_rprint(register const u_char *cp, register const u_char *bp) rp = cp + len; - printf(" %s", tok2str(type2str, "Type%d", typ)); - switch (typ) { + printf(" %s", tok2str(ns_type2str, "Type%d", typ)); + if (rp > snapend) + return(NULL); + switch (typ) { case T_A: + if (cp + sizeof(struct in_addr) > snapend) + return(NULL); printf(" %s", ipaddr_string(cp)); break; @@ -367,15 +383,41 @@ ns_rprint(register const u_char *cp, register const u_char *bp) case T_CNAME: case T_PTR: #ifdef T_DNAME - case T_DNAME: /*XXX not checked as there's no server support yet*/ + case T_DNAME: #endif putchar(' '); - (void)ns_nprint(cp, bp); + if (ns_nprint(cp, bp) == NULL) + return(NULL); break; + case T_SOA: + if (!vflag) + break; + putchar(' '); + if ((cp = ns_nprint(cp, bp)) == NULL) + return(NULL); + putchar(' '); + if ((cp = ns_nprint(cp, bp)) == NULL) + return(NULL); + if (cp + 5 * 4 > snapend) + return(NULL); + printf(" %u", EXTRACT_32BITS(cp)); + cp += 4; + printf(" %u", EXTRACT_32BITS(cp)); + cp += 4; + printf(" %u", EXTRACT_32BITS(cp)); + cp += 4; + printf(" %u", EXTRACT_32BITS(cp)); + cp += 4; + printf(" %u", EXTRACT_32BITS(cp)); + cp += 4; + break; case T_MX: putchar(' '); - (void)ns_nprint(cp + 2, bp); + if (cp + 2 > snapend) + return(NULL); + if (ns_nprint(cp + 2, bp) == NULL) + return(NULL); printf(" %d", EXTRACT_16BITS(cp)); break; @@ -386,25 +428,43 @@ ns_rprint(register const u_char *cp, register const u_char *bp) #ifdef INET6 case T_AAAA: + if (cp + sizeof(struct in6_addr) > snapend) + return(NULL); printf(" %s", ip6addr_string(cp)); break; - case T_A6: /*XXX not checked as there's no server support yet*/ + case T_A6: { struct in6_addr a; - int pbyte; - - pbyte = (*cp + 7) / 8; - memset(&a, 0, sizeof(a)); - memcpy(&a, cp + 1, pbyte); - printf(" %u %s ", *cp, ip6addr_string(&a)); - (void)ns_nprint(cp + 1 + pbyte, bp); + int pbit, pbyte; + + pbit = *cp; + pbyte = (pbit & ~7) / 8; + if (pbit > 128) { + printf(" %u(bad plen)", pbit); + break; + } else if (pbit < 128) { + memset(&a, 0, sizeof(a)); + memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte); + printf(" %u %s", pbit, ip6addr_string(&a)); + } + if (pbit > 0) { + putchar(' '); + if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL) + return(NULL); + } break; } #endif /*INET6*/ + case T_OPT: + printf(" UDPsize=%u", class); + break; + case T_UNSPECA: /* One long string */ - printf(" %.*s", len, cp); + if (cp + len > snapend) + return(NULL); + fn_printn(cp, len, snapend); break; } return (rp); /* XXX This isn't always right */ @@ -415,7 +475,7 @@ ns_print(register const u_char *bp, u_int length) { register const HEADER *np; register int qdcount, ancount, nscount, arcount; - register const u_char *cp; + register const u_char *cp = NULL; np = (const HEADER *)bp; /* get the byte-order right */ @@ -424,44 +484,79 @@ ns_print(register const u_char *bp, u_int length) nscount = ntohs(np->nscount); arcount = ntohs(np->arcount); - if (np->qr) { + if (DNS_QR(np)) { /* this is a response */ - printf(" %d%s%s%s%s%s", + printf(" %d%s%s%s%s%s%s", ntohs(np->id), - ns_ops[np->opcode], - ns_resp[np->rcode], - np->aa? "*" : "", - np->ra? "" : "-", - np->tc? "|" : ""); - if (qdcount != 1) - printf(" [%dq]", qdcount); - /* Print QUESTION section on -vv */ + ns_ops[DNS_OPCODE(np)], + ns_resp[DNS_RCODE(np)], + DNS_AA(np)? "*" : "", + DNS_RA(np)? "" : "-", + DNS_TC(np)? "|" : "", + DNS_CD(np)? "%" : ""); + if (vflag > 1) { - fputs(" q: ", stdout); - cp = ns_nprint((const u_char *)(np + 1), bp); - } else - cp = ns_nskip((const u_char *)(np + 1), bp); + fputs(" q:", stdout); + if ((cp = ns_qprint((const u_char *)(np + 1), bp)) + == NULL) + goto trunc; + } else { + if ((cp = ns_nskip((const u_char *)(np + 1), bp)) + == NULL) + goto trunc; + cp += 4; + } printf(" %d/%d/%d", ancount, nscount, arcount); if (ancount--) { - cp = ns_rprint(cp + 4, bp); - while (ancount-- && cp < snapend) { + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (cp < snapend && ancount--) { putchar(','); - cp = ns_rprint(cp, bp); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } + } + if (ancount > 0) + goto trunc; + /* Print NS and AR sections on -vv */ + if (vflag > 1) { + if (cp < snapend && nscount--) { + fputs(" ns:", stdout); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (cp < snapend && nscount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } } + if (nscount > 0) + goto trunc; + if (cp < snapend && arcount--) { + fputs(" ar:", stdout); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (cp < snapend && arcount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } + } + if (arcount > 0) + goto trunc; } } else { /* this is a request */ - printf(" %d%s%s", - ntohs(np->id), - ns_ops[np->opcode], - np->rd? "+" : ""); + printf(" %d%s%s%s", ntohs(np->id), ns_ops[DNS_OPCODE(np)], + DNS_RD(np) ? "+" : "", + DNS_AD(np) ? "$" : ""); /* any weirdness? */ - if (*(((u_short *)np)+1) & htons(0x6ff)) + if (*(((u_short *)np)+1) & htons(0x6cf)) printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1))); - if (np->opcode == IQUERY) { + if (DNS_OPCODE(np) == IQUERY) { if (qdcount) printf(" [%dq]", qdcount); if (ancount != 1) @@ -478,7 +573,64 @@ ns_print(register const u_char *bp, u_int length) if (arcount) printf(" [%dau]", arcount); - ns_qprint((const u_char *)(np + 1), (const u_char *)np); + if (qdcount--) { + cp = ns_qprint((const u_char *)(np + 1), + (const u_char *)np); + if (!cp) + goto trunc; + while (cp < snapend && qdcount--) { + cp = ns_qprint((const u_char *)cp, + (const u_char *)np); + if (!cp) + goto trunc; + } + } + if (qdcount > 0) + goto trunc; + + /* Print remaining sections on -vv */ + if (vflag > 1) { + if (ancount--) { + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (cp < snapend && ancount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } + } + if (ancount > 0) + goto trunc; + if (cp < snapend && nscount--) { + fputs(" ns:", stdout); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (nscount-- && cp < snapend) { + putchar(','); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } + } + if (nscount > 0) + goto trunc; + if (cp < snapend && arcount--) { + fputs(" ar:", stdout); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + while (cp < snapend && arcount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp)) == NULL) + goto trunc; + } + } + if (arcount > 0) + goto trunc; + } } printf(" (%d)", length); + return; + + trunc: + printf("[|domain]"); + return; } |