* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: Domain Name System (DNS) printer */
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
-
-#include "nameser.h"
+#include "netdissect-stdinc.h"
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
-#include "extract.h" /* must come after interface.h */
+#include "addrtostr.h"
+#include "extract.h"
+
+#include "nameser.h"
static const char *ns_ops[] = {
"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
" NotImp", " Refused", " YXDomain", " YXRRSet",
" NXRRSet", " NotAuth", " NotZone", " Resp11",
" Resp12", " Resp13", " Resp14", " NoChange",
+ " BadVers", "Resp17", " Resp18", " Resp19",
+ " Resp20", "Resp21", " Resp22", " BadCookie",
};
+static const char *
+ns_rcode(u_int rcode) {
+ static char buf[sizeof(" Resp4095")];
+
+ if (rcode < sizeof(ns_resp)/sizeof(ns_resp[0])) {
+ return (ns_resp[rcode]);
+ }
+ snprintf(buf, sizeof(buf), " Resp%u", rcode & 0xfff);
+ return (buf);
+}
+
/* skip over a domain name */
static const u_char *
ns_nskip(netdissect_options *ndo,
- register const u_char *cp)
+ const u_char *cp)
{
- register u_char i;
+ u_char i;
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return (NULL);
- i = *cp++;
+ i = GET_U_1(cp);
+ cp++;
while (i) {
if ((i & INDIR_MASK) == INDIR_MASK)
return (cp + 1);
if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
return(NULL); /* unknown ELT */
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return (NULL);
- if ((bitlen = *cp++) == 0)
+ if ((bitlen = GET_U_1(cp)) == 0)
bitlen = 256;
+ cp++;
bytelen = (bitlen + 7) / 8;
cp += bytelen;
} else
cp += i;
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return (NULL);
- i = *cp++;
+ i = GET_U_1(cp);
+ cp++;
}
return (cp);
}
-/* print a <domain-name> */
static const u_char *
blabel_print(netdissect_options *ndo,
const u_char *cp)
{
- int bitlen, slen, b;
+ u_int bitlen, slen, b;
const u_char *bitp, *lim;
- char tc;
+ uint8_t tc;
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(NULL);
- if ((bitlen = *cp) == 0)
+ if ((bitlen = GET_U_1(cp)) == 0)
bitlen = 256;
slen = (bitlen + 3) / 4;
lim = cp + 1 + slen;
/* print the bit string as a hex string */
- ND_PRINT((ndo, "\\[x"));
+ ND_PRINT("\\[x");
for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
- ND_TCHECK(*bitp);
- ND_PRINT((ndo, "%02x", *bitp));
+ ND_PRINT("%02x", GET_U_1(bitp));
}
if (b > 4) {
- ND_TCHECK(*bitp);
- tc = *bitp++;
- ND_PRINT((ndo, "%02x", tc & (0xff << (8 - b))));
+ tc = GET_U_1(bitp);
+ bitp++;
+ ND_PRINT("%02x", tc & (0xff << (8 - b)));
} else if (b > 0) {
- ND_TCHECK(*bitp);
- tc = *bitp++;
- ND_PRINT((ndo, "%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b))));
+ tc = GET_U_1(bitp);
+ bitp++;
+ ND_PRINT("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
}
- ND_PRINT((ndo, "/%d]", bitlen));
+ ND_PRINT("/%u]", bitlen);
return lim;
-trunc:
- ND_PRINT((ndo, ".../%d]", bitlen));
- return NULL;
}
static int
labellen(netdissect_options *ndo,
const u_char *cp)
{
- register u_int i;
+ u_int i;
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(-1);
- i = *cp;
+ i = GET_U_1(cp);
if ((i & INDIR_MASK) == EDNS0_MASK) {
- int bitlen, elt;
+ u_int bitlen, elt;
if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
- ND_PRINT((ndo, "<ELT %d>", elt));
+ ND_PRINT("<ELT %d>", elt);
return(-1);
}
- if (!ND_TTEST2(*(cp + 1), 1))
+ if (!ND_TTEST_1(cp + 1))
return(-1);
- if ((bitlen = *(cp + 1)) == 0)
+ if ((bitlen = GET_U_1(cp + 1)) == 0)
bitlen = 256;
return(((bitlen + 7) / 8) + 1);
} else
return(i);
}
+/* print a <domain-name> */
const u_char *
-ns_nprint(netdissect_options *ndo,
- register const u_char *cp, register const u_char *bp)
+fqdn_print(netdissect_options *ndo,
+ const u_char *cp, 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 = ndo->ndo_snapend - bp;
+ u_int i, l;
+ const u_char *rp = NULL;
+ int compress = 0;
+ u_int elt;
+ u_int offset, max_offset;
if ((l = labellen(ndo, cp)) == (u_int)-1)
return(NULL);
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(NULL);
- chars_processed = 1;
- if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
+ max_offset = (u_int)(cp - bp);
+ i = GET_U_1(cp);
+ cp++;
+ if ((i & INDIR_MASK) != INDIR_MASK) {
compress = 0;
rp = cp + l;
}
rp = cp + 1;
compress = 1;
}
- if (!ND_TTEST2(*cp, 1))
- return(NULL);
- cp = bp + (((i << 8) | *cp) & 0x3fff);
- if ((l = labellen(ndo, cp)) == (u_int)-1)
- return(NULL);
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(NULL);
- i = *cp++;
- chars_processed++;
-
+ offset = (((i << 8) | GET_U_1(cp)) & 0x3fff);
/*
- * 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.
+ * This must move backwards in the packet.
+ * No RFC explicitly says that, but BIND's
+ * name decompression code requires it,
+ * as a way of preventing infinite loops
+ * and other bad behavior, and it's probably
+ * what was intended (compress by pointing
+ * to domain name suffixes already seen in
+ * the packet).
*/
- if (chars_processed >= data_size) {
- ND_PRINT((ndo, "<LOOP>"));
- return (NULL);
+ if (offset >= max_offset) {
+ ND_PRINT("<BAD PTR>");
+ return(NULL);
}
+ max_offset = offset;
+ cp = bp + offset;
+ if ((l = labellen(ndo, cp)) == (u_int)-1)
+ return(NULL);
+ if (!ND_TTEST_1(cp))
+ return(NULL);
+ i = GET_U_1(cp);
+ cp++;
continue;
}
if ((i & INDIR_MASK) == EDNS0_MASK) {
break;
default:
/* unknown ELT */
- ND_PRINT((ndo, "<ELT %d>", elt));
+ ND_PRINT("<ELT %u>", elt);
return(NULL);
}
} else {
- if (fn_printn(ndo, cp, l, ndo->ndo_snapend))
+ if (nd_printn(ndo, cp, l, ndo->ndo_snapend))
return(NULL);
}
cp += l;
- chars_processed += l;
- ND_PRINT((ndo, "."));
+ ND_PRINT(".");
if ((l = labellen(ndo, cp)) == (u_int)-1)
return(NULL);
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(NULL);
- i = *cp++;
- chars_processed++;
+ i = GET_U_1(cp);
+ cp++;
if (!compress)
rp += l + 1;
}
else
- ND_PRINT((ndo, "."));
+ ND_PRINT(".");
return (rp);
}
/* print a <character-string> */
static const u_char *
ns_cprint(netdissect_options *ndo,
- register const u_char *cp)
+ const u_char *cp)
{
- register u_int i;
+ u_int i;
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return (NULL);
- i = *cp++;
- if (fn_printn(ndo, cp, i, ndo->ndo_snapend))
+ i = GET_U_1(cp);
+ cp++;
+ if (nd_printn(ndo, cp, i, ndo->ndo_snapend))
return (NULL);
return (cp + i);
}
-/* http://www.iana.org/assignments/dns-parameters */
+static void
+print_eopt_ecs(netdissect_options *ndo, const u_char *cp,
+ u_int data_len)
+{
+ u_int family, addr_bits, src_len, scope_len;
+
+ u_char padded[32];
+ char addr[INET6_ADDRSTRLEN];
+
+ /* ecs option must at least contain family, src len, and scope len */
+ if (data_len < 4) {
+ nd_print_invalid(ndo);
+ return;
+ }
+
+ family = GET_BE_U_2(cp);
+ cp += 2;
+ src_len = GET_U_1(cp);
+ cp += 1;
+ scope_len = GET_U_1(cp);
+ cp += 1;
+
+ if (family == 1)
+ addr_bits = 32;
+ else if (family == 2)
+ addr_bits = 128;
+ else {
+ nd_print_invalid(ndo);
+ return;
+ }
+
+ if (data_len - 4 > (addr_bits / 8)) {
+ nd_print_invalid(ndo);
+ return;
+ }
+ /* checks for invalid ecs scope or source length */
+ if (src_len > addr_bits || scope_len > addr_bits || ((src_len + 7) / 8) != (data_len - 4)) {
+ nd_print_invalid(ndo);
+ return;
+ }
+
+ /* pad the truncated address from ecs with zeros */
+ memset(padded, 0, sizeof(padded));
+ memcpy(padded, cp, data_len - 4);
+
+
+ if (family == 1)
+ ND_PRINT("%s/%d/%d", addrtostr(padded, addr, INET_ADDRSTRLEN),
+ src_len, scope_len);
+ else
+ ND_PRINT("%s/%d/%d", addrtostr6(padded, addr, INET6_ADDRSTRLEN),
+ src_len, scope_len);
+
+}
+
+extern const struct tok edns_opt2str[];
+extern const struct tok dau_alg2str[];
+extern const struct tok dhu_alg2str[];
+extern const struct tok n3u_alg2str[];
+
+
+/* print an <EDNS-option> */
+static const u_char *
+eopt_print(netdissect_options *ndo,
+ const u_char *cp)
+{
+ u_int opt, data_len, i;
+
+ if (!ND_TTEST_2(cp))
+ return (NULL);
+ opt = GET_BE_U_2(cp);
+ cp += 2;
+ ND_PRINT("%s", tok2str(edns_opt2str, "Opt%u", opt));
+ if (!ND_TTEST_2(cp))
+ return (NULL);
+ data_len = GET_BE_U_2(cp);
+ cp += 2;
+
+ ND_TCHECK_LEN(cp, data_len);
+
+ if (data_len > 0) {
+ ND_PRINT(" ");
+ switch (opt) {
+
+ case E_ECS:
+ print_eopt_ecs(ndo, cp, data_len);
+ break;
+ case E_COOKIE:
+ if (data_len < 8 || (data_len > 8 && data_len < 16) || data_len > 40)
+ nd_print_invalid(ndo);
+ else {
+ for (i = 0; i < data_len; ++i) {
+ /* split client and server cookie */
+ if (i == 8)
+ ND_PRINT(" ");
+ ND_PRINT("%02x", GET_U_1(cp + i));
+ }
+ }
+ break;
+ case E_KEEPALIVE:
+ if (data_len != 2)
+ nd_print_invalid(ndo);
+ else
+ /* keepalive is in increments of 100ms. Convert to seconds */
+ ND_PRINT("%0.1f sec", (GET_BE_U_2(cp) / 10.0));
+ break;
+ case E_EXPIRE:
+ if (data_len != 4)
+ nd_print_invalid(ndo);
+ else
+ ND_PRINT("%u sec", GET_BE_U_4(cp));
+ break;
+ case E_PADDING:
+ /* ignore contents and just print length */
+ ND_PRINT("(%u)", data_len);
+ break;
+ case E_KEYTAG:
+ if (data_len % 2 != 0)
+ nd_print_invalid(ndo);
+ else
+ for (i = 0; i < data_len; i += 2) {
+ if (i > 0)
+ ND_PRINT(" ");
+ ND_PRINT("%u", GET_BE_U_2(cp + i));
+ }
+ break;
+ case E_DAU:
+ for (i = 0; i < data_len; ++i) {
+ if (i > 0)
+ ND_PRINT(" ");
+ ND_PRINT("%s", tok2str(dau_alg2str, "Alg_%u", GET_U_1(cp + i)));
+ }
+ break;
+ case E_DHU:
+ for (i = 0; i < data_len; ++i) {
+ if (i > 0)
+ ND_PRINT(" ");
+ ND_PRINT("%s", tok2str(dhu_alg2str, "Alg_%u", GET_U_1(cp + i)));
+ }
+ break;
+ case E_N3U:
+ for (i = 0; i < data_len; ++i) {
+ if (i > 0)
+ ND_PRINT(" ");
+ ND_PRINT("%s", tok2str(n3u_alg2str, "Alg_%u", GET_U_1(cp + i)));
+ }
+ break;
+ case E_CHAIN:
+ fqdn_print(ndo, cp, cp + data_len);
+ break;
+ case E_NSID:
+ /* intentional fall-through. NSID is an undefined byte string */
+ default:
+ for (i = 0; i < data_len; ++i)
+ ND_PRINT("%02x", GET_U_1(cp + i));
+ break;
+ }
+ }
+ return (cp + data_len);
+
+ trunc:
+ return (NULL);
+
+}
+
+
+
+extern const struct tok ns_type2str[];
+
+/* https://www.iana.org/assignments/dns-parameters */
const struct tok ns_type2str[] = {
{ T_A, "A" }, /* RFC 1035 */
{ T_NS, "NS" }, /* RFC 1035 */
{ T_MAILB, "MAILB" }, /* RFC 1035 */
{ T_MAILA, "MAILA" }, /* RFC 1035 */
{ T_ANY, "ANY" },
+ { T_URI, "URI" }, /* RFC 7553 */
{ 0, NULL }
};
+extern const struct tok ns_class2str[];
+
const struct tok ns_class2str[] = {
{ C_IN, "IN" }, /* Not used */
{ C_CHAOS, "CHAOS" },
{ 0, NULL }
};
+const struct tok edns_opt2str[] = {
+ { E_LLQ, "LLQ" },
+ { E_UL, "UL" },
+ { E_NSID, "NSID" },
+ { E_DAU, "DAU" },
+ { E_DHU, "DHU" },
+ { E_N3U, "N3U" },
+ { E_ECS, "ECS" },
+ { E_EXPIRE, "EXPIRE" },
+ { E_COOKIE, "COOKIE" },
+ { E_KEEPALIVE, "KEEPALIVE" },
+ { E_PADDING, "PADDING" },
+ { E_CHAIN, "CHAIN" },
+ { E_KEYTAG, "KEY-TAG" },
+ { E_CLIENTTAG, "CLIENT-TAG" },
+ { E_SERVERTAG, "SERVER-TAG" },
+ { 0, NULL }
+};
+
+const struct tok dau_alg2str[] = {
+ { A_DELETE, "DELETE" },
+ { A_RSAMD5, "RSAMD5" },
+ { A_DH, "DH" },
+ { A_DSA, "DS" },
+ { A_RSASHA1, "RSASHA1" },
+ { A_DSA_NSEC3_SHA1, "DSA-NSEC3-SHA1" },
+ { A_RSASHA1_NSEC3_SHA1, "RSASHA1-NSEC3-SHA1" },
+ { A_RSASHA256, "RSASHA256" },
+ { A_RSASHA512, "RSASHA512" },
+ { A_ECC_GOST, "ECC-GOST" },
+ { A_ECDSAP256SHA256, "ECDSAP256SHA256" },
+ { A_ECDSAP384SHA384, "ECDSAP384SHA384" },
+ { A_ED25519, "ED25519" },
+ { A_ED448, "ED448" },
+ { A_INDIRECT, "INDIRECT" },
+ { A_PRIVATEDNS, "PRIVATEDNS" },
+ { A_PRIVATEOID, "PRIVATEOID" },
+ { 0, NULL }
+};
+
+const struct tok dhu_alg2str[] = {
+ { DS_SHA1, "SHA-1" },
+ { DS_SHA256,"SHA-256" },
+ { DS_GOST, "GOST_R_34.11-94" },
+ { DS_SHA384,"SHA-384" },
+ { 0, NULL }
+};
+
+const struct tok n3u_alg2str[] = {
+ { NSEC_SHA1,"SHA-1" },
+ { 0, NULL }
+};
+
/* print a query */
static const u_char *
ns_qprint(netdissect_options *ndo,
- register const u_char *cp, register const u_char *bp, int is_mdns)
+ const u_char *cp, const u_char *bp, int is_mdns)
{
- register const u_char *np = cp;
- register u_int i, class;
+ const u_char *np = cp;
+ u_int i, class;
cp = ns_nskip(ndo, cp);
- if (cp == NULL || !ND_TTEST2(*cp, 4))
+ if (cp == NULL || !ND_TTEST_4(cp))
return(NULL);
/* print the qtype */
- i = EXTRACT_16BITS(cp);
+ i = GET_BE_U_2(cp);
cp += 2;
- ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", i)));
+ ND_PRINT(" %s", tok2str(ns_type2str, "Type%u", i));
/* print the qclass (if it's not IN) */
- i = EXTRACT_16BITS(cp);
+ i = GET_BE_U_2(cp);
cp += 2;
if (is_mdns)
class = (i & ~C_QU);
else
class = i;
if (class != C_IN)
- ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
+ ND_PRINT(" %s", tok2str(ns_class2str, "(Class %u)", class));
if (is_mdns) {
- ND_PRINT((ndo, i & C_QU ? " (QU)" : " (QM)"));
+ ND_PRINT(i & C_QU ? " (QU)" : " (QM)");
}
- ND_PRINT((ndo, "? "));
- cp = ns_nprint(ndo, np, bp);
+ ND_PRINT("? ");
+ cp = fqdn_print(ndo, np, bp);
return(cp ? cp + 4 : NULL);
}
/* print a reply */
static const u_char *
ns_rprint(netdissect_options *ndo,
- register const u_char *cp, register const u_char *bp, int is_mdns)
+ const u_char *cp, 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;
+ u_int i, class, opt_flags = 0;
+ u_short typ, len;
+ const u_char *rp;
if (ndo->ndo_vflag) {
- ND_PRINT((ndo, " "));
- if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
+ ND_PRINT(" ");
+ if ((cp = fqdn_print(ndo, cp, bp)) == NULL)
return NULL;
} else
cp = ns_nskip(ndo, cp);
- if (cp == NULL || !ND_TTEST2(*cp, 10))
+ if (cp == NULL || !ND_TTEST_LEN(cp, 10))
return (ndo->ndo_snapend);
/* print the type/qtype */
- typ = EXTRACT_16BITS(cp);
+ typ = GET_BE_U_2(cp);
cp += 2;
/* print the class (if it's not IN and the type isn't OPT) */
- i = EXTRACT_16BITS(cp);
+ i = GET_BE_U_2(cp);
cp += 2;
if (is_mdns)
class = (i & ~C_CACHE_FLUSH);
else
class = i;
if (class != C_IN && typ != T_OPT)
- ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
+ ND_PRINT(" %s", tok2str(ns_class2str, "(Class %u)", class));
if (is_mdns) {
if (i & C_CACHE_FLUSH)
- ND_PRINT((ndo, " (Cache flush)"));
+ ND_PRINT(" (Cache flush)");
}
if (typ == T_OPT) {
/* get opt flags */
cp += 2;
- opt_flags = EXTRACT_16BITS(cp);
+ opt_flags = GET_BE_U_2(cp);
/* ignore rest of ttl field */
cp += 2;
} else if (ndo->ndo_vflag > 2) {
/* print ttl */
- ND_PRINT((ndo, " ["));
- relts_print(ndo, EXTRACT_32BITS(cp));
- ND_PRINT((ndo, "]"));
+ ND_PRINT(" [");
+ unsigned_relts_print(ndo, GET_BE_U_4(cp));
+ ND_PRINT("]");
cp += 4;
} else {
/* ignore ttl */
cp += 4;
}
- len = EXTRACT_16BITS(cp);
+ len = GET_BE_U_2(cp);
cp += 2;
rp = cp + len;
- ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", typ)));
+ ND_PRINT(" %s", tok2str(ns_type2str, "Type%u", typ));
if (rp > ndo->ndo_snapend)
return(NULL);
switch (typ) {
case T_A:
- if (!ND_TTEST2(*cp, sizeof(struct in_addr)))
+ if (!ND_TTEST_LEN(cp, sizeof(nd_ipv4)))
return(NULL);
- ND_PRINT((ndo, " %s", intoa(htonl(EXTRACT_32BITS(cp)))));
+ ND_PRINT(" %s", intoa(GET_IPV4_TO_NETWORK_ORDER(cp)));
break;
case T_NS:
#ifdef T_DNAME
case T_DNAME:
#endif
- ND_PRINT((ndo, " "));
- if (ns_nprint(ndo, cp, bp) == NULL)
+ ND_PRINT(" ");
+ if (fqdn_print(ndo, cp, bp) == NULL)
return(NULL);
break;
case T_SOA:
if (!ndo->ndo_vflag)
break;
- ND_PRINT((ndo, " "));
- if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
+ ND_PRINT(" ");
+ if ((cp = fqdn_print(ndo, cp, bp)) == NULL)
return(NULL);
- ND_PRINT((ndo, " "));
- if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
+ ND_PRINT(" ");
+ if ((cp = fqdn_print(ndo, cp, bp)) == NULL)
return(NULL);
- if (!ND_TTEST2(*cp, 5 * 4))
+ if (!ND_TTEST_LEN(cp, 5 * 4))
return(NULL);
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_4(cp));
cp += 4;
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_4(cp));
cp += 4;
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_4(cp));
cp += 4;
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_4(cp));
cp += 4;
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_4(cp));
cp += 4;
break;
case T_MX:
- ND_PRINT((ndo, " "));
- if (!ND_TTEST2(*cp, 2))
+ ND_PRINT(" ");
+ if (!ND_TTEST_2(cp))
return(NULL);
- if (ns_nprint(ndo, cp + 2, bp) == NULL)
+ if (fqdn_print(ndo, cp + 2, bp) == NULL)
return(NULL);
- ND_PRINT((ndo, " %d", EXTRACT_16BITS(cp)));
+ ND_PRINT(" %u", GET_BE_U_2(cp));
break;
case T_TXT:
while (cp < rp) {
- ND_PRINT((ndo, " \""));
+ ND_PRINT(" \"");
cp = ns_cprint(ndo, cp);
if (cp == NULL)
return(NULL);
- ND_PRINT((ndo, "\""));
+ ND_PRINT("\"");
}
break;
case T_SRV:
- ND_PRINT((ndo, " "));
- if (!ND_TTEST2(*cp, 6))
+ ND_PRINT(" ");
+ if (!ND_TTEST_6(cp))
return(NULL);
- if (ns_nprint(ndo, cp + 6, bp) == NULL)
+ if (fqdn_print(ndo, cp + 6, bp) == NULL)
return(NULL);
- ND_PRINT((ndo, ":%d %d %d", EXTRACT_16BITS(cp + 4),
- EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2)));
+ ND_PRINT(":%u %u %u", GET_BE_U_2(cp + 4),
+ GET_BE_U_2(cp), GET_BE_U_2(cp + 2));
break;
-#ifdef INET6
case T_AAAA:
{
- struct in6_addr addr;
char ntop_buf[INET6_ADDRSTRLEN];
- if (!ND_TTEST2(*cp, sizeof(struct in6_addr)))
+ if (!ND_TTEST_LEN(cp, sizeof(nd_ipv6)))
return(NULL);
- memcpy(&addr, cp, sizeof(struct in6_addr));
- ND_PRINT((ndo, " %s",
- inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf))));
+ ND_PRINT(" %s",
+ addrtostr6(cp, ntop_buf, sizeof(ntop_buf)));
break;
}
case T_A6:
{
- struct in6_addr a;
+ nd_ipv6 a;
int pbit, pbyte;
char ntop_buf[INET6_ADDRSTRLEN];
- if (!ND_TTEST2(*cp, 1))
+ if (!ND_TTEST_1(cp))
return(NULL);
- pbit = *cp;
+ pbit = GET_U_1(cp);
pbyte = (pbit & ~7) / 8;
if (pbit > 128) {
- ND_PRINT((ndo, " %u(bad plen)", pbit));
+ ND_PRINT(" %u(bad plen)", pbit);
break;
} else if (pbit < 128) {
- if (!ND_TTEST2(*(cp + 1), sizeof(a) - pbyte))
+ if (!ND_TTEST_LEN(cp + 1, sizeof(a) - pbyte))
return(NULL);
- memset(&a, 0, sizeof(a));
- memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
- ND_PRINT((ndo, " %u %s", pbit,
- inet_ntop(AF_INET6, &a, ntop_buf, sizeof(ntop_buf))));
+ memset(a, 0, sizeof(a));
+ memcpy(a + pbyte, cp + 1, sizeof(a) - pbyte);
+ ND_PRINT(" %u %s", pbit,
+ addrtostr6(&a, ntop_buf, sizeof(ntop_buf)));
}
if (pbit > 0) {
- ND_PRINT((ndo, " "));
- if (ns_nprint(ndo, cp + 1 + sizeof(a) - pbyte, bp) == NULL)
+ ND_PRINT(" ");
+ if (fqdn_print(ndo, cp + 1 + sizeof(a) - pbyte, bp) == NULL)
return(NULL);
}
break;
}
-#endif /*INET6*/
+
+ case T_URI:
+ if (!ND_TTEST_LEN(cp, len))
+ return(NULL);
+ ND_PRINT(" %u %u ", GET_BE_U_2(cp), GET_BE_U_2(cp + 2));
+ if (nd_printn(ndo, cp + 4, len - 4, ndo->ndo_snapend))
+ return(NULL);
+ break;
case T_OPT:
- ND_PRINT((ndo, " UDPsize=%u", class));
+ ND_PRINT(" UDPsize=%u", class);
if (opt_flags & 0x8000)
- ND_PRINT((ndo, " OK"));
+ ND_PRINT(" DO");
+ if (cp < rp) {
+ ND_PRINT(" [");
+ while (cp < rp) {
+ cp = eopt_print(ndo, cp);
+ if (cp == NULL)
+ return(NULL);
+ if (cp < rp)
+ ND_PRINT(",");
+ }
+ ND_PRINT("]");
+ }
break;
case T_UNSPECA: /* One long string */
- if (!ND_TTEST2(*cp, len))
+ if (!ND_TTEST_LEN(cp, len))
return(NULL);
- if (fn_printn(ndo, cp, len, ndo->ndo_snapend))
+ if (nd_printn(ndo, cp, len, ndo->ndo_snapend))
return(NULL);
break;
return(NULL);
if (!ndo->ndo_vflag)
break;
- ND_PRINT((ndo, " "));
- if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
+ ND_PRINT(" ");
+ if ((cp = fqdn_print(ndo, cp, bp)) == NULL)
return(NULL);
cp += 6;
- if (!ND_TTEST2(*cp, 2))
+ if (!ND_TTEST_2(cp))
return(NULL);
- ND_PRINT((ndo, " fudge=%u", EXTRACT_16BITS(cp)));
+ ND_PRINT(" fudge=%u", GET_BE_U_2(cp));
cp += 2;
- if (!ND_TTEST2(*cp, 2))
+ if (!ND_TTEST_2(cp))
return(NULL);
- ND_PRINT((ndo, " maclen=%u", EXTRACT_16BITS(cp)));
- cp += 2 + EXTRACT_16BITS(cp);
- if (!ND_TTEST2(*cp, 2))
+ ND_PRINT(" maclen=%u", GET_BE_U_2(cp));
+ cp += 2 + GET_BE_U_2(cp);
+ if (!ND_TTEST_2(cp))
return(NULL);
- ND_PRINT((ndo, " origid=%u", EXTRACT_16BITS(cp)));
+ ND_PRINT(" origid=%u", GET_BE_U_2(cp));
cp += 2;
- if (!ND_TTEST2(*cp, 2))
+ if (!ND_TTEST_2(cp))
return(NULL);
- ND_PRINT((ndo, " error=%u", EXTRACT_16BITS(cp)));
+ ND_PRINT(" error=%u", GET_BE_U_2(cp));
cp += 2;
- if (!ND_TTEST2(*cp, 2))
+ if (!ND_TTEST_2(cp))
return(NULL);
- ND_PRINT((ndo, " otherlen=%u", EXTRACT_16BITS(cp)));
+ ND_PRINT(" otherlen=%u", GET_BE_U_2(cp));
cp += 2;
}
}
}
void
-ns_print(netdissect_options *ndo,
- register const u_char *bp, u_int length, int is_mdns)
+domain_print(netdissect_options *ndo,
+ const u_char *bp, u_int length, int over_tcp, int is_mdns)
{
- register const HEADER *np;
- register int qdcount, ancount, nscount, arcount;
- register const u_char *cp;
+ const dns_header_t *np;
+ uint16_t flags, rcode, rdlen, type;
+ u_int qdcount, ancount, nscount, arcount;
+ u_int i;
+ const u_char *cp;
uint16_t b2;
- np = (const HEADER *)bp;
- ND_TCHECK(*np);
+ ndo->ndo_protocol = "domain";
+
+ if (over_tcp) {
+ /*
+ * The message is prefixed with a two byte length field
+ * which gives the message length, excluding the two byte
+ * length field. (RFC 1035 - 4.2.2. TCP usage)
+ */
+ if (length < 2) {
+ ND_PRINT(" [DNS over TCP: length %u < 2]", length);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ length -= 2; /* excluding the two byte length field */
+ if (GET_BE_U_2(bp) != length) {
+ ND_PRINT(" [prefix length(%u) != length(%u)]",
+ GET_BE_U_2(bp), length);
+ nd_print_invalid(ndo);
+ return;
+ } else {
+ bp += 2;
+ /* in over TCP case, we need to prepend a space
+ * (not needed in over UDP case)
+ */
+ ND_PRINT(" ");
+ }
+ }
+ }
+
+ np = (const dns_header_t *)bp;
+
+ if(length < sizeof(*np)) {
+ nd_print_protocol(ndo);
+ ND_PRINT(" [length %u < %zu]", length, sizeof(*np));
+ nd_print_invalid(ndo);
+ return;
+ }
+
+ ND_TCHECK_SIZE(np);
+ flags = GET_BE_U_2(np->flags);
/* 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);
+ qdcount = GET_BE_U_2(np->qdcount);
+ ancount = GET_BE_U_2(np->ancount);
+ nscount = GET_BE_U_2(np->nscount);
+ arcount = GET_BE_U_2(np->arcount);
- if (DNS_QR(np)) {
+ /* find the opt record to extract extended rcode */
+ cp = (const u_char *)(np + 1);
+ rcode = DNS_RCODE(flags);
+ for (i = 0; i < qdcount; i++) {
+ if ((cp = ns_nskip(ndo, cp)) == NULL)
+ goto print;
+ cp += 4; /* skip QTYPE and QCLASS */
+ if (cp >= ndo->ndo_snapend)
+ goto print;
+ }
+ for (i = 0; i < ancount + nscount; i++) {
+ if ((cp = ns_nskip(ndo, cp)) == NULL)
+ goto print;
+ cp += 8; /* skip TYPE, CLASS and TTL */
+ if (cp + 2 > ndo->ndo_snapend)
+ goto print;
+ rdlen = GET_BE_U_2(cp);
+ cp += 2 + rdlen;
+ if (cp >= ndo->ndo_snapend)
+ goto print;
+ }
+ for (i = 0; i < arcount; i++) {
+ if ((cp = ns_nskip(ndo, cp)) == NULL)
+ goto print;
+ if (cp + 2 > ndo->ndo_snapend)
+ goto print;
+ type = GET_BE_U_2(cp);
+ cp += 4; /* skip TYPE and CLASS */
+ if (cp + 1 > ndo->ndo_snapend)
+ goto print;
+ if (type == T_OPT) {
+ rcode |= (GET_U_1(cp) << 4);
+ goto print;
+ }
+ cp += 4;
+ if (cp + 2 > ndo->ndo_snapend)
+ goto print;
+ rdlen = GET_BE_U_2(cp);
+ cp += 2 + rdlen;
+ if (cp >= ndo->ndo_snapend)
+ goto print;
+ }
+
+ print:
+ if (DNS_QR(flags)) {
/* this is a response */
- ND_PRINT((ndo, "%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)? "$" : ""));
+ ND_PRINT("%u%s%s%s%s%s%s",
+ GET_BE_U_2(np->id),
+ ns_ops[DNS_OPCODE(flags)],
+ ns_rcode(rcode),
+ DNS_AA(flags)? "*" : "",
+ DNS_RA(flags)? "" : "-",
+ DNS_TC(flags)? "|" : "",
+ DNS_AD(flags)? "$" : "");
if (qdcount != 1)
- ND_PRINT((ndo, " [%dq]", qdcount));
+ ND_PRINT(" [%uq]", qdcount);
/* Print QUESTION section on -vv */
cp = (const u_char *)(np + 1);
- while (qdcount--) {
- if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
- ND_PRINT((ndo, ","));
+ for (i = 0; i < qdcount; i++) {
+ if (i != 0)
+ ND_PRINT(",");
if (ndo->ndo_vflag > 1) {
- ND_PRINT((ndo, " q:"));
+ ND_PRINT(" q:");
if ((cp = ns_qprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
} else {
cp += 4; /* skip QTYPE and QCLASS */
}
}
- ND_PRINT((ndo, " %d/%d/%d", ancount, nscount, arcount));
- if (ancount--) {
+ ND_PRINT(" %u/%u/%u", ancount, nscount, arcount);
+ if (ancount) {
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (cp < ndo->ndo_snapend && ancount--) {
- ND_PRINT((ndo, ","));
+ ancount--;
+ while (cp < ndo->ndo_snapend && ancount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ ancount--;
}
}
- if (ancount > 0)
+ if (ancount)
goto trunc;
/* Print NS and AR sections on -vv */
if (ndo->ndo_vflag > 1) {
- if (cp < ndo->ndo_snapend && nscount--) {
- ND_PRINT((ndo, " ns:"));
+ if (cp < ndo->ndo_snapend && nscount) {
+ ND_PRINT(" ns:");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (cp < ndo->ndo_snapend && nscount--) {
- ND_PRINT((ndo, ","));
+ nscount--;
+ while (cp < ndo->ndo_snapend && nscount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ nscount--;
}
}
- if (nscount > 0)
+ if (nscount)
goto trunc;
- if (cp < ndo->ndo_snapend && arcount--) {
- ND_PRINT((ndo, " ar:"));
+ if (cp < ndo->ndo_snapend && arcount) {
+ ND_PRINT(" ar:");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (cp < ndo->ndo_snapend && arcount--) {
- ND_PRINT((ndo, ","));
+ arcount--;
+ while (cp < ndo->ndo_snapend && arcount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ arcount--;
}
}
- if (arcount > 0)
+ if (arcount)
goto trunc;
}
}
else {
/* this is a request */
- ND_PRINT((ndo, "%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
- DNS_RD(np) ? "+" : "",
- DNS_CD(np) ? "%" : ""));
+ ND_PRINT("%u%s%s%s", GET_BE_U_2(np->id),
+ ns_ops[DNS_OPCODE(flags)],
+ DNS_RD(flags) ? "+" : "",
+ DNS_CD(flags) ? "%" : "");
/* any weirdness? */
- b2 = EXTRACT_16BITS(((u_short *)np)+1);
+ b2 = GET_BE_U_2(((const u_short *)np) + 1);
if (b2 & 0x6cf)
- ND_PRINT((ndo, " [b2&3=0x%x]", b2));
+ ND_PRINT(" [b2&3=0x%x]", b2);
- if (DNS_OPCODE(np) == IQUERY) {
+ if (DNS_OPCODE(flags) == IQUERY) {
if (qdcount)
- ND_PRINT((ndo, " [%dq]", qdcount));
+ ND_PRINT(" [%uq]", qdcount);
if (ancount != 1)
- ND_PRINT((ndo, " [%da]", ancount));
+ ND_PRINT(" [%ua]", ancount);
}
else {
if (ancount)
- ND_PRINT((ndo, " [%da]", ancount));
+ ND_PRINT(" [%ua]", ancount);
if (qdcount != 1)
- ND_PRINT((ndo, " [%dq]", qdcount));
+ ND_PRINT(" [%uq]", qdcount);
}
if (nscount)
- ND_PRINT((ndo, " [%dn]", nscount));
+ ND_PRINT(" [%un]", nscount);
if (arcount)
- ND_PRINT((ndo, " [%dau]", arcount));
+ ND_PRINT(" [%uau]", arcount);
cp = (const u_char *)(np + 1);
- if (qdcount--) {
+ if (qdcount) {
cp = ns_qprint(ndo, cp, (const u_char *)np, is_mdns);
if (!cp)
goto trunc;
- while (cp < ndo->ndo_snapend && qdcount--) {
+ qdcount--;
+ while (cp < ndo->ndo_snapend && qdcount) {
cp = ns_qprint(ndo, (const u_char *)cp,
(const u_char *)np,
is_mdns);
if (!cp)
goto trunc;
+ qdcount--;
}
}
- if (qdcount > 0)
+ if (qdcount)
goto trunc;
/* Print remaining sections on -vv */
if (ndo->ndo_vflag > 1) {
- if (ancount--) {
+ if (ancount) {
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (cp < ndo->ndo_snapend && ancount--) {
- ND_PRINT((ndo, ","));
+ ancount--;
+ while (cp < ndo->ndo_snapend && ancount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ ancount--;
}
}
- if (ancount > 0)
+ if (ancount)
goto trunc;
- if (cp < ndo->ndo_snapend && nscount--) {
- ND_PRINT((ndo, " ns:"));
+ if (cp < ndo->ndo_snapend && nscount) {
+ ND_PRINT(" ns:");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (nscount-- && cp < ndo->ndo_snapend) {
- ND_PRINT((ndo, ","));
+ nscount--;
+ while (cp < ndo->ndo_snapend && nscount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ nscount--;
}
}
if (nscount > 0)
goto trunc;
- if (cp < ndo->ndo_snapend && arcount--) {
- ND_PRINT((ndo, " ar:"));
+ if (cp < ndo->ndo_snapend && arcount) {
+ ND_PRINT(" ar:");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
- while (cp < ndo->ndo_snapend && arcount--) {
- ND_PRINT((ndo, ","));
+ arcount--;
+ while (cp < ndo->ndo_snapend && arcount) {
+ ND_PRINT(",");
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
goto trunc;
+ arcount--;
}
}
- if (arcount > 0)
+ if (arcount)
goto trunc;
}
}
- ND_PRINT((ndo, " (%d)", length));
+ ND_PRINT(" (%u)", length);
return;
trunc:
- ND_PRINT((ndo, "[|domain]"));
+ nd_print_trunc(ndo);
}
projects / tcpdump / blobdiff