diff options
Diffstat (limited to 'contrib/tcpdump/print-domain.c')
| -rw-r--r-- | contrib/tcpdump/print-domain.c | 753 |
1 files changed, 753 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-domain.c b/contrib/tcpdump/print-domain.c new file mode 100644 index 0000000..39abda5 --- /dev/null +++ b/contrib/tcpdump/print-domain.c @@ -0,0 +1,753 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +#ifndef lint +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.97.2.1 2007-12-09 01:51:12 guy Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include "nameser.h" + +#include <stdio.h> +#include <string.h> + +#include "interface.h" +#include "addrtoname.h" +#include "extract.h" /* must come after interface.h */ + +static const char *ns_ops[] = { + "", " inv_q", " stat", " op3", " notify", " update", " op6", " op7", + " op8", " updataA", " updateD", " updateDA", + " updateM", " updateMA", " zoneInit", " zoneRef", +}; + +static const char *ns_resp[] = { + "", " FormErr", " ServFail", " NXDomain", + " NotImp", " Refused", " YXDomain", " YXRRSet", + " NXRRSet", " NotAuth", " NotZone", " Resp11", + " Resp12", " Resp13", " Resp14", " NoChange", +}; + +/* skip over a domain name */ +static const u_char * +ns_nskip(register const u_char *cp) +{ + register u_char i; + + if (!TTEST2(*cp, 1)) + return (NULL); + i = *cp++; + while (i) { + if ((i & INDIR_MASK) == INDIR_MASK) + return (cp + 1); + if ((i & INDIR_MASK) == EDNS0_MASK) { + int bitlen, bytelen; + + if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL) + return(NULL); /* unknown ELT */ + if (!TTEST2(*cp, 1)) + return (NULL); + if ((bitlen = *cp++) == 0) + bitlen = 256; + bytelen = (bitlen + 7) / 8; + cp += bytelen; + } else + cp += i; + if (!TTEST2(*cp, 1)) + return (NULL); + i = *cp++; + } + return (cp); +} + +/* print a <domain-name> */ +static const u_char * +blabel_print(const u_char *cp) +{ + int bitlen, slen, b; + const u_char *bitp, *lim; + char tc; + + if (!TTEST2(*cp, 1)) + return(NULL); + if ((bitlen = *cp) == 0) + bitlen = 256; + slen = (bitlen + 3) / 4; + lim = cp + 1 + slen; + + /* print the bit string as a hex string */ + printf("\\[x"); + for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) { + TCHECK(*bitp); + printf("%02x", *bitp); + } + if (b > 4) { + TCHECK(*bitp); + tc = *bitp++; + printf("%02x", tc & (0xff << (8 - b))); + } else if (b > 0) { + TCHECK(*bitp); + tc = *bitp++; + printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b))); + } + printf("/%d]", bitlen); + return lim; +trunc: + printf(".../%d]", bitlen); + return NULL; +} + +static int +labellen(const u_char *cp) +{ + register u_int i; + + if (!TTEST2(*cp, 1)) + return(-1); + i = *cp; + if ((i & INDIR_MASK) == EDNS0_MASK) { + int bitlen, elt; + if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) { + printf("<ELT %d>", elt); + return(-1); + } + if (!TTEST2(*(cp + 1), 1)) + 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; + + if ((l = labellen(cp)) == (u_int)-1) + return(NULL); + if (!TTEST2(*cp, 1)) + return(NULL); + chars_processed = 1; + 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; + } + if (!TTEST2(*cp, 1)) + return(NULL); + cp = bp + (((i << 8) | *cp) & 0x3fff); + if ((l = labellen(cp)) == (u_int)-1) + return(NULL); + if (!TTEST2(*cp, 1)) + return(NULL); + i = *cp++; + chars_processed++; + + /* + * If we've looked at every character in + * the message, this pointer will make + * us look at some character again, + * which means we're looping. + */ + if (chars_processed >= data_size) { + printf("<LOOP>"); + return (NULL); + } + continue; + } + if ((i & INDIR_MASK) == EDNS0_MASK) { + elt = (i & ~INDIR_MASK); + switch(elt) { + case EDNS0_ELT_BITLABEL: + if (blabel_print(cp) == NULL) + return (NULL); + break; + default: + /* unknown ELT */ + printf("<ELT %d>", elt); + return(NULL); + } + } else { + if (fn_printn(cp, l, snapend)) + return(NULL); + } + + cp += l; + chars_processed += l; + putchar('.'); + if ((l = labellen(cp)) == (u_int)-1) + return(NULL); + if (!TTEST2(*cp, 1)) + return(NULL); + i = *cp++; + chars_processed++; + if (!compress) + rp += l + 1; + } + else + putchar('.'); + return (rp); +} + +/* print a <character-string> */ +static const u_char * +ns_cprint(register const u_char *cp) +{ + register u_int i; + + if (!TTEST2(*cp, 1)) + return (NULL); + i = *cp++; + if (fn_printn(cp, i, snapend)) + return (NULL); + return (cp + i); +} + +/* http://www.iana.org/assignments/dns-parameters */ +struct tok ns_type2str[] = { + { T_A, "A" }, /* RFC 1035 */ + { T_NS, "NS" }, /* RFC 1035 */ + { T_MD, "MD" }, /* RFC 1035 */ + { T_MF, "MF" }, /* RFC 1035 */ + { T_CNAME, "CNAME" }, /* RFC 1035 */ + { T_SOA, "SOA" }, /* RFC 1035 */ + { T_MB, "MB" }, /* RFC 1035 */ + { T_MG, "MG" }, /* RFC 1035 */ + { T_MR, "MR" }, /* RFC 1035 */ + { T_NULL, "NULL" }, /* RFC 1035 */ + { T_WKS, "WKS" }, /* RFC 1035 */ + { T_PTR, "PTR" }, /* RFC 1035 */ + { T_HINFO, "HINFO" }, /* RFC 1035 */ + { T_MINFO, "MINFO" }, /* RFC 1035 */ + { T_MX, "MX" }, /* RFC 1035 */ + { T_TXT, "TXT" }, /* RFC 1035 */ + { T_RP, "RP" }, /* RFC 1183 */ + { T_AFSDB, "AFSDB" }, /* RFC 1183 */ + { T_X25, "X25" }, /* RFC 1183 */ + { T_ISDN, "ISDN" }, /* RFC 1183 */ + { T_RT, "RT" }, /* RFC 1183 */ + { T_NSAP, "NSAP" }, /* RFC 1706 */ + { T_NSAP_PTR, "NSAP_PTR" }, + { T_SIG, "SIG" }, /* RFC 2535 */ + { T_KEY, "KEY" }, /* RFC 2535 */ + { T_PX, "PX" }, /* RFC 2163 */ + { T_GPOS, "GPOS" }, /* RFC 1712 */ + { T_AAAA, "AAAA" }, /* RFC 1886 */ + { T_LOC, "LOC" }, /* RFC 1876 */ + { T_NXT, "NXT" }, /* RFC 2535 */ + { T_EID, "EID" }, /* Nimrod */ + { T_NIMLOC, "NIMLOC" }, /* Nimrod */ + { T_SRV, "SRV" }, /* RFC 2782 */ + { T_ATMA, "ATMA" }, /* ATM Forum */ + { T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */ + { T_KX, "KX" }, /* RFC 2230 */ + { T_CERT, "CERT" }, /* RFC 2538 */ + { T_A6, "A6" }, /* RFC 2874 */ + { T_DNAME, "DNAME" }, /* RFC 2672 */ + { T_SINK, "SINK" }, + { T_OPT, "OPT" }, /* RFC 2671 */ + { T_APL, "APL" }, /* RFC 3123 */ + { T_DS, "DS" }, /* RFC 4034 */ + { T_SSHFP, "SSHFP" }, /* RFC 4255 */ + { T_IPSECKEY, "IPSECKEY" }, /* RFC 4025 */ + { T_RRSIG, "RRSIG" }, /* RFC 4034 */ + { T_NSEC, "NSEC" }, /* RFC 4034 */ + { T_DNSKEY, "DNSKEY" }, /* RFC 4034 */ + { T_SPF, "SPF" }, /* RFC-schlitt-spf-classic-02.txt */ + { T_UINFO, "UINFO" }, + { T_UID, "UID" }, + { T_GID, "GID" }, + { T_UNSPEC, "UNSPEC" }, + { T_UNSPECA, "UNSPECA" }, + { T_TKEY, "TKEY" }, /* RFC 2930 */ + { T_TSIG, "TSIG" }, /* RFC 2845 */ + { T_IXFR, "IXFR" }, /* RFC 1995 */ + { T_AXFR, "AXFR" }, /* RFC 1035 */ + { T_MAILB, "MAILB" }, /* RFC 1035 */ + { T_MAILA, "MAILA" }, /* RFC 1035 */ + { T_ANY, "ANY" }, + { 0, NULL } +}; + +struct tok ns_class2str[] = { + { C_IN, "IN" }, /* Not used */ + { C_CHAOS, "CHAOS" }, + { C_HS, "HS" }, + { C_ANY, "ANY" }, + { 0, NULL } +}; + +/* print a query */ +static const u_char * +ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns) +{ + register const u_char *np = cp; + register u_int i, class; + + cp = ns_nskip(cp); + + if (cp == NULL || !TTEST2(*cp, 4)) + return(NULL); + + /* print the qtype */ + i = EXTRACT_16BITS(cp); + cp += 2; + printf(" %s", tok2str(ns_type2str, "Type%d", i)); + /* print the qclass (if it's not IN) */ + i = EXTRACT_16BITS(cp); + cp += 2; + if (is_mdns) + class = (i & ~C_QU); + else + class = i; + if (class != C_IN) + printf(" %s", tok2str(ns_class2str, "(Class %d)", class)); + if (is_mdns) { + if (i & C_QU) + printf(" (QU)"); + else + printf(" (QM)"); + } + + fputs("? ", stdout); + 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, int is_mdns) +{ + register u_int i, class, opt_flags = 0; + register u_short typ, len; + register const u_char *rp; + + if (vflag) { + putchar(' '); + if ((cp = ns_nprint(cp, bp)) == NULL) + return NULL; + } else + cp = ns_nskip(cp); + + if (cp == NULL || !TTEST2(*cp, 10)) + return (snapend); + + /* print the type/qtype */ + typ = EXTRACT_16BITS(cp); + cp += 2; + /* print the class (if it's not IN and the type isn't OPT) */ + i = EXTRACT_16BITS(cp); + cp += 2; + if (is_mdns) + class = (i & ~C_CACHE_FLUSH); + else + class = i; + if (class != C_IN && typ != T_OPT) + printf(" %s", tok2str(ns_class2str, "(Class %d)", class)); + if (is_mdns) { + if (i & C_CACHE_FLUSH) + printf(" (Cache flush)"); + } + + if (typ == T_OPT) { + /* get opt flags */ + cp += 2; + opt_flags = EXTRACT_16BITS(cp); + /* ignore rest of ttl field */ + cp += 2; + } else if (vflag > 2) { + /* print ttl */ + printf(" ["); + relts_print(EXTRACT_32BITS(cp)); + printf("]"); + cp += 4; + } else { + /* ignore ttl */ + cp += 4; + } + + len = EXTRACT_16BITS(cp); + cp += 2; + + rp = cp + len; + + printf(" %s", tok2str(ns_type2str, "Type%d", typ)); + if (rp > snapend) + return(NULL); + + switch (typ) { + case T_A: + if (!TTEST2(*cp, sizeof(struct in_addr))) + return(NULL); + printf(" %s", intoa(htonl(EXTRACT_32BITS(cp)))); + break; + + case T_NS: + case T_CNAME: + case T_PTR: +#ifdef T_DNAME + case T_DNAME: +#endif + putchar(' '); + 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 (!TTEST2(*cp, 5 * 4)) + 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(' '); + if (!TTEST2(*cp, 2)) + return(NULL); + if (ns_nprint(cp + 2, bp) == NULL) + return(NULL); + printf(" %d", EXTRACT_16BITS(cp)); + break; + + case T_TXT: + while (cp < rp) { + printf(" \""); + cp = ns_cprint(cp); + if (cp == NULL) + return(NULL); + putchar('"'); + } + break; + + case T_SRV: + putchar(' '); + if (!TTEST2(*cp, 6)) + return(NULL); + if (ns_nprint(cp + 6, bp) == NULL) + return(NULL); + printf(":%d %d %d", EXTRACT_16BITS(cp + 4), + EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2)); + break; + +#ifdef INET6 + case T_AAAA: + { + struct in6_addr addr; + char ntop_buf[INET6_ADDRSTRLEN]; + + if (!TTEST2(*cp, sizeof(struct in6_addr))) + return(NULL); + memcpy(&addr, cp, sizeof(struct in6_addr)); + printf(" %s", + inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf))); + + break; + } + + case T_A6: + { + struct in6_addr a; + int pbit, pbyte; + char ntop_buf[INET6_ADDRSTRLEN]; + + if (!TTEST2(*cp, 1)) + return(NULL); + pbit = *cp; + pbyte = (pbit & ~7) / 8; + if (pbit > 128) { + printf(" %u(bad plen)", pbit); + break; + } else if (pbit < 128) { + if (!TTEST2(*(cp + 1), sizeof(a) - pbyte)) + return(NULL); + memset(&a, 0, sizeof(a)); + memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte); + printf(" %u %s", pbit, + inet_ntop(AF_INET6, &a, ntop_buf, sizeof(ntop_buf))); + } + 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); + if (opt_flags & 0x8000) + printf(" OK"); + break; + + case T_UNSPECA: /* One long string */ + if (!TTEST2(*cp, len)) + return(NULL); + if (fn_printn(cp, len, snapend)) + return(NULL); + break; + + case T_TSIG: + { + if (cp + len > snapend) + return(NULL); + if (!vflag) + break; + putchar(' '); + if ((cp = ns_nprint(cp, bp)) == NULL) + return(NULL); + cp += 6; + if (!TTEST2(*cp, 2)) + return(NULL); + printf(" fudge=%u", EXTRACT_16BITS(cp)); + cp += 2; + if (!TTEST2(*cp, 2)) + return(NULL); + printf(" maclen=%u", EXTRACT_16BITS(cp)); + cp += 2 + EXTRACT_16BITS(cp); + if (!TTEST2(*cp, 2)) + return(NULL); + printf(" origid=%u", EXTRACT_16BITS(cp)); + cp += 2; + if (!TTEST2(*cp, 2)) + return(NULL); + printf(" error=%u", EXTRACT_16BITS(cp)); + cp += 2; + if (!TTEST2(*cp, 2)) + return(NULL); + printf(" otherlen=%u", EXTRACT_16BITS(cp)); + cp += 2; + } + } + return (rp); /* XXX This isn't always right */ +} + +void +ns_print(register const u_char *bp, u_int length, int is_mdns) +{ + register const HEADER *np; + register int qdcount, ancount, nscount, arcount; + register const u_char *cp; + u_int16_t b2; + + np = (const HEADER *)bp; + TCHECK(*np); + /* get the byte-order right */ + qdcount = EXTRACT_16BITS(&np->qdcount); + ancount = EXTRACT_16BITS(&np->ancount); + nscount = EXTRACT_16BITS(&np->nscount); + arcount = EXTRACT_16BITS(&np->arcount); + + if (DNS_QR(np)) { + /* this is a response */ + printf("%d%s%s%s%s%s%s", + EXTRACT_16BITS(&np->id), + ns_ops[DNS_OPCODE(np)], + ns_resp[DNS_RCODE(np)], + DNS_AA(np)? "*" : "", + DNS_RA(np)? "" : "-", + DNS_TC(np)? "|" : "", + DNS_AD(np)? "$" : ""); + + if (qdcount != 1) + printf(" [%dq]", qdcount); + /* Print QUESTION section on -vv */ + cp = (const u_char *)(np + 1); + while (qdcount--) { + if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1) + putchar(','); + if (vflag > 1) { + fputs(" q:", stdout); + if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } else { + if ((cp = ns_nskip(cp)) == NULL) + goto trunc; + cp += 4; /* skip QTYPE and QCLASS */ + } + } + printf(" %d/%d/%d", ancount, nscount, arcount); + if (ancount--) { + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + while (cp < snapend && ancount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == 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, is_mdns)) == NULL) + goto trunc; + while (cp < snapend && nscount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } + } + if (nscount > 0) + goto trunc; + if (cp < snapend && arcount--) { + fputs(" ar:", stdout); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + while (cp < snapend && arcount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } + } + if (arcount > 0) + goto trunc; + } + } + else { + /* this is a request */ + printf("%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)], + DNS_RD(np) ? "+" : "", + DNS_CD(np) ? "%" : ""); + + /* any weirdness? */ + b2 = EXTRACT_16BITS(((u_short *)np)+1); + if (b2 & 0x6cf) + printf(" [b2&3=0x%x]", b2); + + if (DNS_OPCODE(np) == IQUERY) { + if (qdcount) + printf(" [%dq]", qdcount); + if (ancount != 1) + printf(" [%da]", ancount); + } + else { + if (ancount) + printf(" [%da]", ancount); + if (qdcount != 1) + printf(" [%dq]", qdcount); + } + if (nscount) + printf(" [%dn]", nscount); + if (arcount) + printf(" [%dau]", arcount); + + cp = (const u_char *)(np + 1); + if (qdcount--) { + cp = ns_qprint(cp, (const u_char *)np, is_mdns); + if (!cp) + goto trunc; + while (cp < snapend && qdcount--) { + cp = ns_qprint((const u_char *)cp, + (const u_char *)np, + is_mdns); + 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, is_mdns)) == NULL) + goto trunc; + while (cp < snapend && ancount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } + } + if (ancount > 0) + goto trunc; + if (cp < snapend && nscount--) { + fputs(" ns:", stdout); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + while (nscount-- && cp < snapend) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } + } + if (nscount > 0) + goto trunc; + if (cp < snapend && arcount--) { + fputs(" ar:", stdout); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + while (cp < snapend && arcount--) { + putchar(','); + if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL) + goto trunc; + } + } + if (arcount > 0) + goto trunc; + } + } + printf(" (%d)", length); + return; + + trunc: + printf("[|domain]"); + return; +} |
