/* * 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: head/contrib/tcpdump/print-domain.c 75118 2001-04-03 07:50:46Z fenner $ */ #ifndef lint static const char rcsid[] = "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.64 2001/01/02 23:24:51 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #ifdef NOERROR #undef NOERROR /* Solaris sucks */ #endif #ifdef NOERROR #undef T_UNSPEC /* SINIX does too */ #endif #include "nameser.h" #include #include #include "interface.h" #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 */ #endif #ifndef T_DNAME #define T_DNAME 39 /* non-terminal redirection */ #endif #ifndef T_OPT #define T_OPT 41 /* EDNS0 option (meta-RR) */ #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", " updateM", " updateMA", " zoneInit", " zoneRef", }; static char *ns_resp[] = { "", " FormErr", " ServFail", " NXDomain", " NotImp", " Refused", " Resp6", " Resp7", " Resp8", " Resp9", " Resp10", " Resp11", " Resp12", " Resp13", " Resp14", " NoChange", }; /* skip over a domain name */ static const u_char * ns_nskip(register const u_char *cp, register const u_char *bp) { register u_char i; if (((i = *cp++) & INDIR_MASK) == INDIR_MASK) return (cp + 1); if (cp >= snapend) return(NULL); while (i && cp < snapend) { 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); } /* print a */ static const u_char * 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; 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; if ((l = labellen(cp)) < 0) return(NULL); if (cp >= snapend) 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; } cp = bp + (((i << 8) | *cp) & 0x3fff); if (cp >= snapend) return(NULL); if ((l = labellen(cp)) < 0) 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(""); return (NULL); } continue; } 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); 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 += l + 1; } else putchar('.'); return (rp); } /* print a */ static const u_char * 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[] = { { T_A, "A" }, { T_NS, "NS" }, { T_MD, "MD" }, { T_MF, "MF" }, { T_CNAME, "CNAME" }, { T_SOA, "SOA" }, { T_MB, "MB" }, { T_MG, "MG" }, { T_MR, "MR" }, { T_NULL, "NULL" }, { T_WKS, "WKS" }, { T_PTR, "PTR" }, { T_HINFO, "HINFO" }, { T_MINFO, "MINFO" }, { T_MX, "MX" }, { T_TXT, "TXT" }, { T_RP, "RP" }, { T_AFSDB, "AFSDB" }, { T_X25, "X25" }, { T_ISDN, "ISDN" }, { T_RT, "RT" }, { T_NSAP, "NSAP" }, { T_NSAP_PTR, "NSAP_PTR" }, { T_SIG, "SIG" }, { T_KEY, "KEY" }, { 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 " }, { T_DNAME, "DNAME " }, { T_OPT, "OPT " }, { T_UINFO, "UINFO" }, { T_UID, "UID" }, { T_GID, "GID" }, { T_UNSPEC, "UNSPEC" }, { T_UNSPECA, "UNSPECA" }, { T_AXFR, "AXFR" }, { T_MAILB, "MAILB" }, { T_MAILA, "MAILA" }, { T_ANY, "ANY" }, { 0, NULL } }; static struct tok 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) { register const u_char *np = cp; register u_int i; cp = ns_nskip(cp, bp); 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)); i = *cp++ << 8; i |= *cp++; if (i != C_IN) printf(" %s", tok2str(class2str, "(Class %d)", i)); 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) { register u_int class; 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, bp); if (cp + 10 > snapend || cp == NULL) return (snapend); /* print the type/qtype and class (if it's not IN) */ typ = *cp++ << 8; typ |= *cp++; class = *cp++ << 8; class |= *cp++; if (class != C_IN && typ != T_OPT) printf(" %s", tok2str(class2str, "(Class %d)", class)); /* ignore ttl */ cp += 4; len = *cp++ << 8; len |= *cp++; rp = cp + len; printf(" %s", tok2str(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; 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 (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(' '); if (cp + 2 > snapend) return(NULL); if (ns_nprint(cp + 2, bp) == NULL) return(NULL); printf(" %d", EXTRACT_16BITS(cp)); break; case T_TXT: putchar(' '); (void)ns_cprint(cp, bp); break; #ifdef INET6 case T_AAAA: if (cp + sizeof(struct in6_addr) > snapend) return(NULL); printf(" %s", ip6addr_string(cp)); break; case T_A6: { struct in6_addr a; 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 */ if (cp + len > snapend) return(NULL); fn_printn(cp, len, snapend); break; } return (rp); /* XXX This isn't always right */ } void 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 = NULL; np = (const HEADER *)bp; /* get the byte-order right */ qdcount = ntohs(np->qdcount); ancount = ntohs(np->ancount); nscount = ntohs(np->nscount); arcount = ntohs(np->arcount); if (DNS_QR(np)) { /* this is a response */ printf(" %d%s%s%s%s%s%s", ntohs(np->id), ns_ops[DNS_OPCODE(np)], ns_resp[DNS_RCODE(np)], DNS_AA(np)? "*" : "", DNS_RA(np)? "" : "-", DNS_TC(np)? "|" : "", DNS_CD(np)? "%" : ""); if (qdcount != 1) printf(" [%dq]", qdcount); /* Print QUESTION section on -vv */ if (vflag > 1) { 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--) { if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; while (ancount-- && cp < snapend) { putchar(','); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; } } /* Print NS and AR sections on -vv */ if (vflag > 1) { if (nscount-- && cp < snapend) { 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 (arcount-- && cp < snapend) { fputs(" ar:", stdout); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; while (arcount-- && cp < snapend) { putchar(','); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; } } } } else { /* this is a request */ 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(0x6cf)) printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1))); 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); if (qdcount--) { cp = ns_qprint((const u_char *)(np + 1), (const u_char *)np); if (!cp) goto trunc; if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; while (qdcount-- && cp < snapend) { cp = ns_qprint((const u_char *)cp, (const u_char *)np); if (!cp) goto trunc; if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; } } /* Print remaining sections on -vv */ if (vflag > 1) { if (ancount--) { if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; while (ancount-- && cp < snapend) { putchar(','); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; } } if (nscount-- && cp < snapend) { 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 (arcount-- && cp < snapend) { fputs(" ar:", stdout); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; while (arcount-- && cp < snapend) { putchar(','); if ((cp = ns_rprint(cp, bp)) == NULL) goto trunc; } } } } printf(" (%d)", length); return; trunc: printf("[|domain]"); return; }