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/*
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 * Copyright (C) 2016, 2017  Internet Systems Consortium, Inc. ("ISC")
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 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

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#define FD_SETSIZE 1600

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#include <config.h>

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#include <stdio.h>
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#include <string.h>
#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <assert.h>
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#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/time.h>
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#include <sys/ioctl.h>
#include <sys/uio.h>
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#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <signal.h>
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#ifndef FD_COPY
#define FD_COPY(x, y) memmove(y, x, sizeof(*x))
#endif

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#define ns_t_dname 39
#define ns_t_sink 40
#define ns_t_apl 42
#define ns_t_ds 43
#define ns_t_sshfp 44
#define ns_t_ipseckey 45
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#define ns_t_rrsig 46
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#define ns_t_nsec 47
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#define ns_t_dnskey 48
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#define ns_t_dhcid 49
#define ns_t_nsec3 50
#define ns_t_nsec3param 51
#define ns_t_tlsa 52
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#define ns_t_smimea 53
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#define ns_t_hip 55
#define ns_t_ninfo 56
#define ns_t_talink 58
#define ns_t_cds 59
#define ns_t_cdnskey 60
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#define ns_t_openpgpkey 61
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#define ns_t_csync 62
#define ns_t_spf 99
#define ns_t_nid 104
#define ns_t_l32 105
#define ns_t_l34 106
#define ns_t_lp 107
#define ns_t_eui48 108
#define ns_t_eui64 109
#define ns_t_uri 256
#define ns_t_caa 257
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#define ns_t_avc 258
#define ns_t_doa 259
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#define ns_t_ta 32768
#define ns_t_dlv 32769
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#define ns_r_badcookie 23

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static int eof = 0;
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static int maxfd = -1;
static fd_set rfds, wfds;
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static int outstanding = 0;
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static int maxoutstanding = 100;
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static void(*rhandlers[FD_SETSIZE])(int);
static void(*whandlers[FD_SETSIZE])(int);

static int udp4 = -1;
static int udp6 = -1;
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static int icmp4 = -1;
static int icmp6 = -1;
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static int ipv4only = 0;
static int ipv6only = 0;

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static int allok  = 0;
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static int bad  = 0;
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static int badtag  = 0;
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static int ednsonly  = 0;
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static int debug = 0;
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static int inorder = 0;
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static int serial = 0;
static long long sent;
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#ifdef HAVE_RES_GETSERVERS
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static union res_sockaddr_union servers[10];
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#else
static union {
        struct sockaddr_in sin;
        struct sockaddr_in6 sin6;
} servers[10];
#endif

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static int nservers = 0;
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int ident = 0;
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/*
 * Doubly linked list macros.
 */
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#define APPEND(list, item, link) do { \
	if ((list).tail) \
		(list).tail->link.next = (item); \
	else \
		(list).head = (item); \
	(item)->link.prev = list.tail; \
	(item)->link.next = NULL; \
	(list).tail = (item); \
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	(item)->link.linked = 1; \
} while (0)

#define PREPEND(list, item, link) do { \
	if ((list).head) \
		(list).head->link.prev = (item); \
	else \
		(list).tail = (item); \
	(item)->link.prev = NULL; \
	(item)->link.next = list.head; \
	(list).head = (item); \
	(item)->link.linked = 1; \
} while (0)

#define INSERTBEFORE(list, before, item, link) do { \
	assert(LINKED(before, link)); \
	if ((before)->link.prev == NULL) \
		PREPEND(list, item, link); \
	else { \
		(item)->link.prev = (before)->link.prev; \
		(before)->link.prev = (item); \
		(item)->link.prev->link.next = (item); \
		(item)->link.next = (before); \
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		(item)->link.linked = 1; \
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	} \
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} while (0)

#define UNLINK(list, item, link) do { \
	if ((item)->link.next) \
		(item)->link.next->link.prev = (item)->link.prev; \
	else \
		list.tail = (item)->link.prev; \
	if ((item)->link.prev) \
		(item)->link.prev->link.next = (item)->link.next; \
	else \
		list.head = (item)->link.next; \
	(item)->link.next = (item)->link.prev = NULL; \
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	(item)->link.linked = 0; \
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} while (0)

#define NEXT(item, link) (item)->link.next
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#define PREV(item, link) (item)->link.prev
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#define LINKED(item, link) (item)->link.linked
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#define HEAD(list) (list).head
#define TAIL(list) (list).tail

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/*
 * Test groupings
 */
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#define EDNS 0x01
#define COMM 0x02
#define FULL 0x04
#define TYPE 0x08
#define EXPL 0x10

static int what = EDNS;
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static struct {
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	const char *name;		/* test nmemonic */
	unsigned int what;		/* select what test to make / report */
	unsigned short rdlen;		/* edns rdata length */
	const char *rdata;		/* edns rdata */
	unsigned short udpsize;		/* edns UDP size (0 == no EDNS) */
	unsigned short flags;		/* edns flags to be set */
	unsigned short version;		/* edns version */
	unsigned int tcp;		/* use tcp */
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	unsigned int cookie;		/* opt record has cookie */
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	unsigned int ignore;		/* ignore tc in response */
	unsigned int tc;		/* set tc in request */
	unsigned int rd;		/* set rd in request */
	unsigned int ra;		/* set ra in request */
	unsigned int cd;		/* set cd in request */
	unsigned int ad;		/* set ad  in request */
	unsigned int aa;		/* set aa in request */
	unsigned int z;			/* set z in request */
	unsigned int opcode;		/* use opcode for request */
	unsigned short type;		/* query type code */
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	const char *dig;		/* dig command */
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} opts[] = {
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "dns",       EDNS,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec SOA <zone>"
	},
	{ "aa",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec +aaflag SOA <zone>"
	},
	{ "ad",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,  0, ns_t_soa,
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	  "dig +noedns +ad +norec SOA <zone>"
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	},
	{ "cd",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec +cd SOA <zone>"
	},
	{ "ra",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec +raflag SOA <zone>"
	},
	{ "rd",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +rec SOA <zone>"
	},
	{ "tc",        FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec +tcflag SOA <zone>"
	},
	{ "zflag",     FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,  0, ns_t_soa,
	  "dig +noedns +noad +norec +zflag SOA <zone>"
	},
	{ "opcode",    FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 15, 0,
	  "dig +noedns +noad +norec +header-only +opcode=15"
	},
	{ "opcodeflg", FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 15, 0,
	  "dig +noedns +header-only +opcode=15 +tcflag +rec +raflag +cd +ad +aaflag +zflag"
	},
	{ "type666",   FULL,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 666,
	  "dig +noedns +noad +norec TYPE666 <zone>"
	},
	{ "tcp",       FULL,  0, "",    0, 0x0000, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec +tcp SOA <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "edns",      EDNS,  0, "", 4096, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec SOA <zone>"
	},
	{ "edns1",     EDNS,  0, "", 4096, 0x0000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec SOA <zone>"
	},
	{ "edns@512",  EDNS,  0, "",  512, 0x0000, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dnskey,
	  "dig +edns=0 +nocookie +noad +norec +dnssec +ignoretc +bufsize=512 DNSKEY <zone>"
	},
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	{ "ednsopt",   EDNS,  4, "\x00\x64\x00\x00",	/* 100 */
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				     4096, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +ednsopt=100 SOA <zone>"
	},
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	{ "edns1opt",  EDNS,  4, "\x00\x64\x00\x00",	/* 100 */
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				     4096, 0x0000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec +ednsopt=100 SOA <zone>"
	},
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	{ "do",        EDNS,  0, "",
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				     4096, 0x8000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +dnssec SOA <zone>"
	},
	{ "edns1do",   FULL,  0, "", 4096, 0x8000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec +dnssec SOA <zone>"
	},
	{ "ednsflags", EDNS,  0, "", 4096, 0x0080, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +ednsflags=0x0080 SOA <zone>"
	},
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	{ "optlist",   EDNS,  4 + 8 + 4 + 12,
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	  "\x00\x03\x00\x00" 		     /* NSID */
	  "\x00\x08\x00\x04\x00\x01\x00\x00" /* ECS */
	  "\x00\x09\x00\x00" 		     /* EXPIRE */
	  "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08",	/* COOKIE */
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				     4096, 0x0000, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +noad +norec +nsid +subnet=0.0.0.0/0 +expire +cookie=0102030405060708 SOA <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "ednsnsid", FULL,  4, "\x00\x03\x00\x00",	/* NSID */
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				     4096, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +nsid SOA <zone>"
	},
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	{ "ednscookie", FULL, 12, "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08", /* COOKIE */
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				     4096, 0x0000, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +noad +norec +cookie=0102030405060708 SOA <zone>"
	},
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	{ "ednsexpire", FULL, 4, "\x00\x09\x00\x00",	/* EXPIRE */
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				     4096, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +expire SOA <zone>"
	},
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	{ "ednssubnet", FULL,  8, "\x00\x08\x00\x04\x00\x01\x00\x00",	/* ECS */
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				     4096, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +nocookie +noad +norec +subnet=0.0.0.0/0 SOA <zone>"
	},

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	{ "edns1nsid", FULL,  4, "\x00\x03\x00\x00",	/* NSID */
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				     4096, 0x0000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec +nsid SOA <zone>"
	},
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	{ "edns1cookie", FULL, 12, "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08", /* COOKIE */
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				     4096, 0x0000, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +noad +norec +cookie=0102030405060708 SOA <zone>"
	},
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	{ "edns1expire", FULL, 4, "\x00\x09\x00\x00",	/* EXPIRE */
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				     4096, 0x0000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec +expire SOA <zone>"
	},
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	{ "edns1subnet", FULL,  8, "\x00\x08\x00\x04\x00\x01\x00\x00",	/* ECS */
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				     4096, 0x0000, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=1 +noednsneg +nocookie +noad +norec +subnet=0.0.0.0/0 SOA <zone>"
	},
	{ "ednstcp",   EDNS,  0, "",  512, 0x8000, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dnskey,
	  "dig +edns=0 +nocookie +noad +norec +dnssec +bufsize=512 +tcp DNSKEY <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "bind11",    COMM, 12, "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08", /* COOKIE */
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				     4096, 0x8000, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +cookie=0102030405060708 +noad +norec +dnssec SOA <zone>"
	},
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	{ "dig11",     COMM, 12, "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08", /* COOKIE */
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				     4096, 0x0000, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,  0, ns_t_soa,
	  "dig +edns=0 +cookie=0102030405060708 +ad +rec SOA <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "A",         TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_a,
	  "dig +noedns +noad +norec A <zone>"
	},
	{ "NS",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_ns,
	  "dig +noedns +noad +norec NS <zone>"
	},
	{ "MD",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_md,
	  "dig +noedns +noad +norec MD <zone>"
	},
	{ "MF",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_mf,
	  "dig +noedns +noad +norec MF <zone>"
	},
	{ "CNAME",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_cname,
	  "dig +noedns +noad +norec CNAME <zone>"
	},
	{ "SOA",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_soa,
	  "dig +noedns +noad +norec SOA <zone>"
	},
	{ "MB",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_mb,
	  "dig +noedns +noad +norec MB <zone>"
	},
	{ "MG",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_mg,
	  "dig +noedns +noad +norec MG <zone>"
	},
	{ "MR",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_mr,
	  "dig +noedns +noad +norec MR <zone>"
	},
	{ "NULL",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_null,
	  "dig +noedns +noad +norec NULL <zone>"
	},
	{ "WKS",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_wks,
	  "dig +noedns +noad +norec WKS <zone>"
	},
	{ "PTR",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_ptr,
	  "dig +noedns +noad +norec PTR <zone>"
	},
	{ "HINFO",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_hinfo,
	  "dig +noedns +noad +norec HINFO <zone>"
	},
	{ "MINFO",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_minfo,
	  "dig +noedns +noad +norec MINFO <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "MX",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_mx,
	  "dig +noedns +noad +norec MX <zone>"
	},
	{ "TXT",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_txt,
	  "dig +noedns +noad +norec TXT <zone>"
	},
	{ "RP",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_rp,
	  "dig +noedns +noad +norec RP <zone>"
	},
	{ "AFSDB",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_afsdb,
	  "dig +noedns +noad +norec AFSDB <zone>"
	},
	{ "X25",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_x25,
	  "dig +noedns +noad +norec X25 <zone>"
	},
	{ "ISDN",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_isdn,
	  "dig +noedns +noad +norec ISDN <zone>"
	},
	{ "RT",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_rt,
	  "dig +noedns +noad +norec RT <zone>"
	},
	{ "NSAP",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nsap,
	  "dig +noedns +noad +norec NSAP <zone>"
	},
	{ "NSAP-PTR",  TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nsap_ptr,
	  "dig +noedns +noad +norec NSAP-PTR <zone>"
	},
	{ "SIG",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_sig,
	  "dig +noedns +noad +norec SIG <zone>"
	},
	{ "KEY",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_key,
	  "dig +noedns +noad +norec KEY <zone>"
	},
	{ "PX",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_px,
	  "dig +noedns +noad +norec PX <zone>"
	},
	{ "GPOS",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_gpos,
	  "dig +noedns +noad +norec GPOS <zone>"
	},
	{ "AAAA",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_aaaa,
	  "dig +noedns +noad +norec AAAA <zone>"
	},
	{ "LOC",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_loc,
	  "dig +noedns +noad +norec LOC <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "NXT",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nxt,
	  "dig +noedns +noad +norec NXT <zone>"
	},
	{ "SRV",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_srv,
	  "dig +noedns +noad +norec SRV <zone>"
	},
	{ "NAPTR",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_naptr,
	  "dig +noedns +noad +norec NAPTR <zone>"
	},
	{ "KX",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_kx,
	  "dig +noedns +noad +norec KX <zone>"
	},
	{ "CERT",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_cert,
	  "dig +noedns +noad +norec CERT <zone>"
	},
	{ "A6",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_a6,
	  "dig +noedns +noad +norec A6 <zone>"
	},
	{ "DNAME",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dname,
	  "dig +noedns +noad +norec DNAME <zone>"
	},
	{ "APL",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_apl,
	  "dig +noedns +noad +norec APL <zone>"
	},
	{ "DS",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_ds,
	  "dig +noedns +noad +norec DS <zone>"
	},
	{ "SSHFP",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_sshfp,
	  "dig +noedns +noad +norec SSHFP <zone>"
	},
	{ "IPSECKEY",  TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_ipseckey,
	  "dig +noedns +noad +norec IPSECKEY <zone>"
	},
	{ "RRSIG",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_rrsig,
	  "dig +noedns +noad +norec RRSIG <zone>"
	},
	{ "NSEC",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nsec,
	  "dig +noedns +noad +norec NSEC <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "DNSKEY",    TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dnskey,
	  "dig +noedns +noad +norec DNSKEY <zone>"
	},
	{ "DHCID",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dhcid,
	  "dig +noedns +noad +norec DHCID <zone>"
	},
	{ "NSEC3",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nsec3,
	  "dig +noedns +noad +norec NSEC3 <zone>"
	},
	{ "NSEC3PARAM",TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nsec3param,
	  "dig +noedns +noad +norec NSEC3PARAM <zone>"
	},
	{ "TLSA",      TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_tlsa,
	  "dig +noedns +noad +norec TLSA <zone>"
	},
	{ "SMIMEA",    TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_smimea,
	  "dig +noedns +noad +norec SMIMEA <zone>"
	},
	{ "HIP",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_hip,
	  "dig +noedns +noad +norec HIP <zone>"
	},
	{ "CDS",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_cds,
	  "dig +noedns +noad +norec CDS <zone>"
	},
	{ "CDNSKEY",   TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_cdnskey,
	  "dig +noedns +noad +norec CDNSKEY <zone>"
	},
	{ "OPENPGPKEY",TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_openpgpkey,
	  "dig +noedns +noad +norec OPENPGPKEY <zone>"
	},
	{ "SPF",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_spf,
	  "dig +noedns +noad +norec SPF <zone>"
	},
	{ "NID",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_nid,
	  "dig +noedns +noad +norec NID <zone>"
	},
	{ "L32",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_l32,
	  "dig +noedns +noad +norec L32 <zone>"
	},
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	/*                           size   eflgs vr  T ck ig tc rd ra cd ad aa  z  op  type */
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	{ "L64",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_l34,
	  "dig +noedns +noad +norec L64 <zone>"
	},
	{ "LP",        TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_lp,
	  "dig +noedns +noad +norec LP <zone>"
	},
	{ "EUI48",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_eui48,
	  "dig +noedns +noad +norec EUI48 <zone>"
	},
	{ "EUI64",     TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_eui64,
	  "dig +noedns +noad +norec EUI64 <zone>"
	},
	{ "URI",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_uri,
	  "dig +noedns +noad +norec URI <zone>"
	},
	{ "CAA",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_caa,
	  "dig +noedns +noad +norec CAA <zone>"
	},
	{ "AVC",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_avc,
	  "dig +noedns +noad +norec AVC <zone>"
	},
	{ "DOA",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_doa,
	  "dig +noedns +noad +norec DOA <zone>"
	},
	{ "DLV",       TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, ns_t_dlv,
	  "dig +noedns +noad +norec DLV <zone>"
	},
	{ "TYPE1000",  TYPE,  0, "",    0, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 1000,
	  "dig +noedns +noad +norec TYPE1000 <zone>"
	}
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};

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/*
 * Summary structure where results from multiple lookups are recorded.
 */
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struct summary {
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	struct {
		struct summary *prev;
		struct summary *next;
		int linked;
	} link;
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	char zone[1024];		/* the zone's name */
	char ns[1024];			/* the server's name */
	struct sockaddr_storage storage;/* server we are talking to */
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	int tests;			/* number of outstanding tests */
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	int last;			/* last test sent */
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	int deferred;			/* was the printing deferred */
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	int done;			/* we are done */
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	int type;			/* recursive query lookup type */
	int nodataa;			/* recursive query got nodata */
	int nodataaaaa;			/* recursive query got nodata */
	int nxdomain;			/* recursive query got nxdomain */
	int nxdomaina;			/* recursive query got nxdomain */
	int nxdomainaaaa;		/* recursive query got nxdomain */
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	int faileda;
	int failedaaaa;
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	int cnamea;			/* Nameserver is CNAME */
	int cnameaaaa;			/* Nameserver is CNAME */
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	int seenrrsig;			/* a rrsig was seen in "do" test */
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	int seenopt;			/* see a EDNS response */
	int seenedns;			/* see a EDNS response */
	int seenfailure;		/* see a lookup failure */
	int allok;			/* all answers are current ok */
	int allrefused;			/* all answers are current ok */
	int allservfail;		/* all answers are current ok */
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	struct summary *xlink;		/* cross link of recursive A/AAAA */
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	char results[sizeof(opts)/sizeof(opts[0])][100];
};

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static struct {
	struct summary *head;
	struct summary *tail;
} summaries;

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struct workitem {
	struct {
		struct workitem *next;
		struct workitem *prev;
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		int linked;
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	} link, clink, plink, rlink, idlink, seqlink;
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	unsigned short id;		/* the query id we are waiting for */
	struct timeval when;		/* when we will timeout */
	int type;			/* the query type being looked up */
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	int test;			/* test number / server number */
	int sends;			/* number of times this UDP request
					 * has been sent */
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	int buflen;			/* the size of the request to be sent */
	int tcpfd;			/* the tcp file descriptor */
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	int outstanding;		/* outstanding has been set */
	int havelen;			/* readlen is tcp message length */
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	int readlen;			/* how much we need to read */
	int read;			/* how much has been read so far */
	unsigned char buf[512];		/* the question we sent */
	unsigned char tcpbuf[0x10000];	/* where to accumulate the tcp response */
	struct summary *summary;	/* where this test is summaried */
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};

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/*
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 * Work queues:
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 *	'work' udp qeries;
 *	'connecting' tcp qeries;
 *	'reading' tcp qeries;
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 *	'pending' deferred work items;
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 *
 * Outstanding queries by qid.
 *	'ids'
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 *
 * Outstanding icmp by seq.
 *	'ids'
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 */
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static struct {
	struct workitem *head;
	struct workitem *tail;
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} work, connecting, reading, pending, ids[0x10000], seq[0x10000];
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static void
dotest(struct workitem *item);

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static void
nextserver(struct workitem *item);

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static void
connecttoserver(struct workitem *item);
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static void
report(struct summary *summary);

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static int
storage_equal(struct sockaddr_storage *s1, struct sockaddr_storage *s2) {
	struct sockaddr_in *sin1, *sin2;
	struct sockaddr_in6 *sin61, *sin62;

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	if (s1->ss_family != s2->ss_family)
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		return (0);

	switch (s1->ss_family) {
	case AF_INET:
		sin1 = (struct sockaddr_in *)s1;
		sin2 = (struct sockaddr_in *)s2;
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		if (sin1->sin_port != sin2->sin_port ||
		    sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
			return (0);
		return (1);
	case AF_INET6:
		sin61 = (struct sockaddr_in6 *)s1;
		sin62 = (struct sockaddr_in6 *)s2;

		if (sin61->sin6_port != sin62->sin6_port ||
		    memcmp(&sin61->sin6_addr, &sin62->sin6_addr, 16) != 0)
			return (0);
		return (1);
	}
	return (0);
}

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/*
 * Check if it is safe to use this id to this address.
 */
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static int
checkid(struct sockaddr_storage *storage, int id) {
	struct workitem *item;

	item = HEAD(ids[id]);
	while (item != NULL &&
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	       !storage_equal(storage, &item->summary->storage))
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		item = NEXT(item, idlink);
	return ((item == NULL) ? 1 : 0);
}

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/*
 * Check if we have a outstanding icmp with this sequence number
 * to this address.
 */
static int
checkseq(struct sockaddr_storage *storage, int id) {
	struct workitem *item;

	item = HEAD(seq[id]);
	while (item != NULL &&
	       !storage_equal(storage, &item->summary->storage))
		item = NEXT(item, seqlink);
	return ((item == NULL) ? 1 : 0);
}

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static void
freesummary(struct summary *summary) {
	if (LINKED(summary, link))
		UNLINK(summaries, summary, link);
	free(summary);
}

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/*
 * Generate a report line.
 */
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static void
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printandfree(struct summary *summary) {
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	struct sockaddr_in *s = (struct sockaddr_in *)&summary->storage;
	struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&summary->storage;;
	char addrbuf[64];
	void *addr;
	unsigned int i;
	int x;

	if ((summary->type == ns_t_a || summary->type == ns_t_aaaa) &&
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	    summary->nodataa && summary->nodataaaaa) {
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		printf("%s. %s: no address records found\n",
		       summary->zone, summary->ns);
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		freesummary(summary);
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		return;
	}
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	if ((summary->type == ns_t_a || summary->type == ns_t_aaaa) &&
	    summary->nxdomaina && summary->nxdomainaaaa) {
		printf("%s. %s: no address records found (NXDOMAIN)\n",
		       summary->zone, summary->ns);
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		freesummary(summary);
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		return;
	}
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	if ((summary->type == ns_t_a || summary->type == ns_t_aaaa) &&
	    summary->faileda && summary->failedaaaa) {
		printf("%s. %s: address lookups failed\n",
		       summary->zone, summary->ns);
		freesummary(summary);
		return;
	}

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	if ((summary->type == ns_t_a || summary->type == ns_t_aaaa) &&
	    (summary->cnamea || summary->cnameaaaa)) {
		printf("%s. %s: nameserver is a CNAME\n",
		       summary->zone, summary->ns);
		freesummary(summary);
		return;
	}

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	/*
	 * Do deferred xlink failure reports.
	 */
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	if (summary->type == ns_t_a &&
	    summary->nodataa && summary->failedaaaa) {
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		printf("%s. %s:", summary->zone, summary->ns);
		printf(" AAAAA lookup failed\n");
		freesummary(summary);
		return;
	}
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	if (summary->type == ns_t_aaaa &&
	    summary->nodataaaaa && summary->faileda) {
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		printf("%s. %s:", summary->zone, summary->ns);
		printf(" A lookup failed\n");
		freesummary(summary);
		return;
	}
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	if (summary->type == ns_t_a &&
	    summary->faileda && summary->nxdomainaaaa) {
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		printf("%s. %s:", summary->zone, summary->ns);
		printf(" AAAAA nxdomain\n");
		freesummary(summary);
		return;
	}
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	if (summary->type == ns_t_aaaa &&
	    summary->failedaaaa && summary->nxdomaina) {
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		printf("%s. %s:", summary->zone, summary->ns);
		printf(" A nxdomain\n");
		freesummary(summary);
		return;
	}
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	if (summary->done || summary->nodataa || summary->nodataaaaa) {
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		freesummary(summary);
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		return;
	}
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	if (summary->type != 0 && summary->nxdomain) {
		if (summary->type == ns_t_ns) {
			printf("%s.: NS nxdomain\n", summary->zone);
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			freesummary(summary);
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			return;
		}
		printf("%s. %s:", summary->zone, summary->ns);
		if (summary->type == ns_t_a) printf(" A");
		if (summary->type == ns_t_aaaa) printf(" AAAA");
		printf(" nxdomain\n");
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		freesummary(summary);
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		return;
	}
	if (summary->type == ns_t_a) {
		printf("%s. %s:", summary->zone, summary->ns);
		printf(" A lookup failed\n");
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		freesummary(summary);
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		return;
	}
	if (summary->type == ns_t_aaaa) {
		printf("%s. %s:", summary->zone, summary->ns);
		printf(" AAAA lookup failed\n");
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		freesummary(summary);
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		return;
	}
	if (summary->type == ns_t_ns) {
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		printf("%s.:", summary->zone);
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		printf(" NS lookup failed\n");
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		freesummary(summary);
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		return;
	}
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	if (summary->seenopt && (summary->allrefused && summary->allservfail))
		summary->seenedns = 1;

	if (summary->type != 0 || (summary->allok && bad) ||
	    (!summary->seenfailure && !summary->seenedns && ednsonly)) {
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		freesummary(summary);
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		return;
	}

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	switch (summary->storage.ss_family) {
	case AF_INET: addr = &s->sin_addr; break;
	case AF_INET6: addr = &s6->sin6_addr; break;
	default: addr = NULL; break;
	}
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	if (addr == NULL)
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		strncpy(addrbuf, "<unknown>", sizeof(addrbuf));
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	else
		inet_ntop(summary->storage.ss_family, addr,
			  addrbuf, sizeof(addrbuf));

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	x = -1;
	printf("%s. @%s (%s.):", summary->zone, addrbuf, summary->ns);
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	if (allok && summary->allok)
		printf(" all ok");
	else
		for (i = 0; i < sizeof(opts)/sizeof(opts[0]); i++) {
			if (opts[i].what != 0 && (opts[i].what & what) == 0)
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				continue;
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			if (summary->results[i][0] == 0)
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				strncpy(summary->results[i], "skipped", 100);
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			if (strcmp(opts[i].name, "do") == 0)
				x = i;
			if (strcmp(opts[i].name, "ednstcp") == 0 && x != -1 &&
			    (!badtag || (strcmp(summary->results[x], "ok") != 0 &&
					 strncmp(summary->results[x], "ok,", 3) != 0)))
			{
				printf(" signed=%s", summary->results[x]);
				if (summary->seenrrsig)
					printf(",yes");
			}
			if (badtag) {
				if (strcmp(summary->results[i], "ok") == 0 ||
				    strncmp(summary->results[i], "ok,", 3) == 0)
					continue;
			}
			printf(" %s=%s", opts[i].name, summary->results[i]);
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		}
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	printf("\n");
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	freesummary(summary);
}

static void
report(struct summary *summary) {

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	/*
	 * Send the next test now that we have completed the last test.
	 */
	if (serial && summary->type == 0 && summary->tests == 1) {
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		for (summary->last++;
		     summary->last < sizeof(opts)/sizeof(opts[0]);
		     summary->last++) {
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			struct workitem *item;
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			if (opts[summary->last].what != 0 &&
			    (opts[summary->last].what & what) == 0)
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				continue;
			item = calloc(1, sizeof(*item));
			if (item == NULL)
				continue;
			item->summary = summary;
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			item->test = item->summary->last;
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			item->tcpfd = -1;
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			dotest(item);
			return;
		}
	}

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	/*
	 * Have all the tests completed?
	 */
	summary->tests--;
	if (summary->tests)
		return;

	/*
	 * If we are cross linked record the lookup details on the other
	 * structure.
	 */
	if (summary->xlink) {
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		if (summary->cnamea) {
			summary->xlink->cnamea = 1;
			summary->done = 1;
		}
		if (summary->cnameaaaa) {
			summary->xlink->cnameaaaa = 1;
			summary->done = 1;
		}
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		if (summary->nodataa) {
			summary->xlink->nodataa = 1;
			summary->done = 1;
		}
		if (summary->nodataaaaa) {
			summary->xlink->nodataaaaa = 1;
			summary->done = 1;
		}
		if (summary->nxdomaina) {
			summary->xlink->nxdomaina = 1;
			summary->done = 1;
		}
		if (summary->nxdomainaaaa) {
			summary->xlink->nxdomainaaaa = 1;
			summary->done = 1;
		}
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		if (!summary->done) {
			if (summary->type == ns_t_a) {
				summary->xlink->faileda = 1;
				summary->done = 1;
			}
			if (summary->type == ns_t_aaaa) {
				summary->xlink->failedaaaa = 1;
				summary->done = 1;
			}
		}
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		/*
		 * Remove the cross link.
		 */
		summary->xlink->xlink = NULL;
		summary->xlink = NULL;
		if (summary->done) {
			freesummary(summary);
			goto print_deferred;
		}
	}
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	if (!summary->done) {
		if (summary->type == ns_t_a)
			summary->faileda = 1;
		if (summary->type == ns_t_aaaa)
			summary->failedaaaa = 1;
	}
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	if (inorder && PREV(summary, link)) {
		summary->deferred = 1;
		return;
	}
	printandfree(summary);

 print_deferred:
	while ((summary = HEAD(summaries)) && summary->deferred)
		printandfree(summary);
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}

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/*
 * Free a work item and unlink.
 */
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static void
freeitem(struct workitem * item) {
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	if (item->summary)
		report(item->summary);
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	if (item->tcpfd != -1) {
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		FD_CLR(item->tcpfd, &rfds);
		FD_CLR(item->tcpfd, &wfds);
		rhandlers[item->tcpfd] = NULL;
		whandlers[item->tcpfd] = NULL;
		close(item->tcpfd);
	}
	if (item->outstanding)
		outstanding--;
	if (LINKED(item, link))
		UNLINK(work, item, link);
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	if (LINKED(item, plink))
		UNLINK(pending, item, plink);
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	if (LINKED(item, rlink))
		UNLINK(reading, item, rlink);
	if (LINKED(item, clink))
		UNLINK(connecting, item, clink);
	if (LINKED(item, idlink))
		UNLINK(ids[item->id], item, idlink);
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	if (LINKED(item, seqlink))
		UNLINK(seq[item->id], item, seqlink);
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	free(item);
}

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/*
 * Add a tag to the report.
 */
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static void
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addtag(struct workitem *item, const char *tag) {
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	char *result = item->summary->results[item->test];
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	if (result[0]) strncat(result, ",", 100);
	strncat(result, tag, 100);
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}

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/*
 * Resend a UDP request.
 */
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static void
resend(struct workitem *item) {
	int n, fd = -1;
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	socklen_t ss_len;
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	switch (item->summary->storage.ss_family) {
	case AF_INET:
		fd = udp4;
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		ss_len = sizeof(struct sockaddr_in);
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		break;
	case AF_INET6:
		fd = udp6;
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		ss_len = sizeof(struct sockaddr_in6);
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		break;
	}

	if (fd == -1) {
		addtag(item, "skipped");
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		item->summary->allok = 0;
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		freeitem(item);
		return;
	}

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	if (!item->outstanding && outstanding > maxoutstanding) {
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		gettimeofday(&item->when, NULL);
		item->when.tv_sec += 1;
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		if (LINKED(item, link))
			UNLINK(work, item, link);
		APPEND(pending, item, plink);
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		return;
	}

	n = sendto(fd, item->buf, item->buflen, 0,
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		   (struct sockaddr *)&item->summary->storage, ss_len);
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	if (n > 0) {
		if (debug)
			printf("resend %s rdlen=%u udpsize=%u flags=%04x "
			       "version=%u tcp=%u ignore=%u id=%u\n",
			       opts[item->test].name, opts[item->test].rdlen,
			       opts[item->test].udpsize, opts[item->test].flags,
			       opts[item->test].version, opts[item->test].tcp,
			       opts[item->test].ignore, item->id);
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		sent++;
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		if (!item->outstanding++)
			outstanding++;
		gettimeofday(&item->when, NULL);
		item->when.tv_sec += 1;
		item->sends++;
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		if (LINKED(item, link))
			UNLINK(work, item, link);
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		APPEND(work, item, link);
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	} else if (item->summary->type) {
		nextserver(item);
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	} else {
		addtag(item, "failed");
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		item->summary->allok = 0;
		item->summary->seenfailure = 1;
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		freeitem(item);
	}
}

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/*
 * Start a individual test.
 */
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static void
dotest(struct workitem *item) {
	unsigned char *cp;
	unsigned int ttl;
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	int n, fd, id, tries = 0, opcode;
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	socklen_t ss_len;
	
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	switch (item->summary->storage.ss_family) {
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	case AF_INET:
		fd = udp4;
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		ss_len = sizeof(struct sockaddr_in);
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		break;
	case AF_INET6:
		fd = udp6;
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		ss_len = sizeof(struct sockaddr_in6);
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		break;
	}

	if (fd == -1) {
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		addtag(item, "skipped");
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		item->summary->allok = 0;
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		freeitem(item);
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		return;
	}
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	/*
	 * res_mkquery only really knows about QUERY but it is useful
	 * for initalising the header when the opcode isn't QUERY.
	 */
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	opcode = opts[item->test].opcode;
	switch (opcode) {
	case 0: break;
	default:
		opcode = ns_o_query;
	}

	n = res_mkquery(opcode, item->summary->zone, ns_c_in,
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			opts[item->test].type, NULL, 0, NULL,
			item->buf, sizeof(item->buf));
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	/* fixup opcode? */
	if (n > 0 && opts[item->test].opcode != opcode) {
		item->buf[2] &= 0x17;
		item->buf[2] |= (opts[item->test].opcode & 0x0f) << 3;
		/* Zero question section. */
		if (opts[item->test].opcode == 15)
			item->buf[4] = item->buf[5] = 0;
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		n = 12;
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	}
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	/*
	 * Set DNS flags as specified by test.
	 */
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	if (opts[item->test].tc)
		item->buf[2] |= 0x2;	/* set tc */
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	if (opts[item->test].rd)
		item->buf[2] |= 0x1;	/* set rd */
	else
		item->buf[2] &= ~0x1;	/* clear rd */
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	if (opts[item->test].ra)
		item->buf[3] |= 0x80;	/* set ra */
	if (opts[item->test].z)
		item->buf[3] |= 0x40;	/* set z */
	if (opts[item->test].ad)
		item->buf[3] |= 0x20;	/* set ad */
	if (opts[item->test].cd)
		item->buf[3] |= 0x10;	/* set cd */
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	if (n > 12) {
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		char name[1024];
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		/*
		 * Make zone canonical.
		 */
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		dn_expand(item->buf, item->buf + n, item->buf + 12,
			  name, sizeof(name));
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		strncpy(item->summary->zone, name,
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			sizeof(item->summary->zone));
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	}
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	/*
	 * Add OPT record if required by test.
	 */
	if (n > 0 && opts[item->test].udpsize > 0 &&
	    11 + opts[item->test].rdlen < 512 - n) {
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		cp = item->buf + n;
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		*cp++ = 0;				/* name */
		ns_put16(ns_t_opt, cp);			/* type */
		cp += 2;
		ns_put16(opts[item->test].udpsize, cp);	/* class */
		cp += 2;
		ttl = (opts[item->test].version << 16) |
		      opts[item->test].flags;
		ns_put32(ttl, cp);			/* ttl */
		cp += 4;
		ns_put16(opts[item->test].rdlen, cp);	/* rdlen */
		cp += 2;
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		memcpy(cp, opts[item->test].rdata, opts[item->test].rdlen);
		cp += opts[item->test].rdlen;
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		item->buf[11] = 1;			/* adcount */
		n = cp - item->buf;			/* total length */
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	}

	if (n > 0) {
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		/*
		 * Adjust id if it clashes with a outstanding request.
		 */
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		id = item->buf[0] << 8 | item->buf[1];

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		while (!checkid(&item->summary->storage, id) &&
		       tries++ < 0xffff)
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			id = (id + 1) & 0xffff;
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		if (tries == 0xffff) {
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			addtag(item, "skipped");
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			item->summary->allok = 0;
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			item->summary->seenfailure = 1;
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			freeitem(item);
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			return;
		}
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		item->buf[0] = id >> 8;
		item->buf[1] = id & 0xff;
		item->id = id;
		item->buflen = n;

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		if (opts[item->test].tcp) {
			connecttoserver(item);
			return;
		}

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		/*
		 * If there is too much outstanding work queue this item.
		 */
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		if (!item->outstanding && outstanding > maxoutstanding) {
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			gettimeofday(&item->when, NULL);
			item->when.tv_sec += 1;
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			APPEND(pending, item, plink);
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			APPEND(ids[item->id], item, idlink);
			return;
		}

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		n = sendto(fd, item->buf, item->buflen, 0,
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			   (struct sockaddr *)&item->summary->storage, ss_len);
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	}

	if (n > 0) {
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		if (debug)
			printf("%s rdlen=%u udpsize=%u flags=%04x version=%u "
			       "tcp=%u ignore=%u id=%u\n",
			       opts[item->test].name, opts[item->test].rdlen,
			       opts[item->test].udpsize, opts[item->test].flags,
			       opts[item->test].version, opts[item->test].tcp,
			       opts[item->test].ignore, item->id);
		if (!item->outstanding++)
			outstanding++;
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		sent++;
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		gettimeofday(&item->when, NULL);
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		item->when.tv_sec += 1;
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		item->sends = 1;
		APPEND(work, item, link);
		APPEND(ids[item->id], item, idlink);
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	} else {
		addtag(item, "failed");
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		item->summary->allok = 0;
		item->summary->seenfailure = 1;
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		freeitem(item);
	}
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}

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/*
 * Start a series of tests.
 */
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static void
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check(char *zone, char *ns, char *address, struct summary *parent) {
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	size_t i;
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	int fd;
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	struct in_addr addr;
	struct in6_addr addr6;
	struct sockaddr_storage storage;
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	struct summary *summary;
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	memset(&storage, 0, sizeof(storage));
	if (inet_pton(AF_INET6, address, &addr6) == 1) {
		struct sockaddr_in6 *s = (struct sockaddr_in6 *)&storage;
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#ifdef HAVE_SIN6_LEN
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		s->sin6_len = sizeof(struct sockaddr_in6);
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#endif
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		s->sin6_family = AF_INET6;
		s->sin6_port = htons(53);
		s->sin6_addr = addr6;
		fd = udp6;
	} else if (inet_pton(AF_INET, address, &addr) == 1) {
		struct sockaddr_in *s = (struct sockaddr_in *)&storage;
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#ifdef HAVE_SIN_LEN
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		s->sin_len = sizeof(struct sockaddr_in);
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#endif
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		s->sin_family = AF_INET;
		s->