genreport.c 32.8 KB
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#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
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#include <sys/ioctl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/uio.h>
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#define ns_t_rrsig 46
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#define ns_t_dnskey 48

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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;
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 debug = 0;

static union res_sockaddr_union servers[10];
static int nservers = 0;
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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; \
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	(item)->link.linked = 1; \
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	(list).tail = (item); \
} 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
#define PREV(item, link) (item)->link.next
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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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struct {
	const char *name;
	unsigned short rdlen;
	const char *rdata;
	unsigned short udpsize;
	unsigned short flags;
	unsigned short version;
	unsigned int tcp;
	unsigned int ignore;
	unsigned short type;
} opts[] = {
	{ "dns", 0, NULL, 0, 0, 0, 0, 0, ns_t_soa },
	{ "edns", 0, "", 4096, 0, 0, 0, 0, ns_t_soa },
	{ "edns1", 0, "" , 4096, 0, 1, 0, 0, ns_t_soa },
	{ "edns@512", 0, "" , 512, 0, 0, 0, 1, ns_t_dnskey },
	{ "ednsopt", 4, "\x00\x64\x00", 4096, 0, 0, 0, 0, ns_t_soa },
	{ "edns1opt", 4, "\x00\x64\x00", 4096, 0, 1, 0, 0, ns_t_soa },
	{ "do", 4, "\0\144\0", 4096, 0x8000, 0, 0, 0, ns_t_soa },
	{ "ednsflags", 0, "", 4096, 0x80, 0, 0, 0, ns_t_soa },
	{ "optlist", 4 + 8 + 4 + 12,
	  "\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 */
	  4096, 0, 0, 0, 0, ns_t_soa },
/*
	{ "bind", 12, "\x00\x0a\x00\x08\x01\x02\x03\x04\x05\x06\x07\x08",
	  4096, 1, 0, 0, 0, ns_t_soa },
*/
	{ "ednstcp", 0, "", 512, 1, 0, 1, 0, ns_t_dnskey }
};

struct summary {
	char zone[1024];
	char ns[1024];
	struct sockaddr_storage storage;
	int tests;
	int done;
	int type;
	int nodataa;
	int nodataaaa;
	int nxdomain;
	int nxdomaina;
	int nxdomainaaaa;
	int seenrrsig;
	struct summary *xlink;
	char results[sizeof(opts)/sizeof(opts[0])][100];
};

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struct workitem {
	struct {
		struct workitem *next;
		struct workitem *prev;
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		int linked;
	} link, clink, rlink, idlink;
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	unsigned short id;
	struct timeval when;
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	int type;
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	int test;
	int sends;
	int buflen;
	int tcpfd;
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	int outstanding;
	int havelen;
	int readlen;
	int read;
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	unsigned char buf[512];
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	unsigned char tcpbuf[0x10000];
	char result[100];
	struct summary *summary;
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};

static struct {
	struct workitem *head;
	struct workitem *tail;
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} work, connecting, reading, ids[0x10000];
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static void
connecttoserver(struct workitem *item);
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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;

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

	switch (s1->ss_family) {
	case AF_INET:
		sin1 = (struct sockaddr_in *)s1;
		sin2 = (struct sockaddr_in *)s2;
			
		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);
}

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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static void
report(struct summary *summary) {
	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;

	summary->tests--;
	if (summary->tests)
		return;

	if (summary->xlink) {
		if (summary->nodataa)
			summary->xlink->nodataa = 1;
		if (summary->nodataaaa)
			summary->xlink->nodataaaa = 1;
		if (summary->nxdomaina)
			summary->xlink->nxdomaina = 1;
		if (summary->nxdomainaaaa)
			summary->xlink->nxdomainaaaa = 1;
		summary->xlink->xlink = NULL;
		summary->xlink = NULL;
		summary->done = 1;
	}

	if ((summary->type == ns_t_a || summary->type == ns_t_aaaa) &&
	    summary->nodataa && summary->nodataaaa) {
		printf("%s. %s: no address records found\n",
		       summary->zone, summary->ns);
		free(summary);
		return;
	}
	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);
		free(summary);
		return;
	}

	if (summary->done) {
		free(summary);
		return;
	}
	
	if (summary->storage.ss_family == AF_INET)
		addr = &s->sin_addr;
	else
		addr = &s6->sin6_addr;
	inet_ntop(summary->storage.ss_family, addr, addrbuf, sizeof(addrbuf));
	if (summary->type != 0 && summary->nxdomain) {
		if (summary->type == ns_t_ns) {
			printf("%s.: NS nxdomain\n", summary->zone);
			free(summary);
			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");
		free(summary);
		return;
	}
	if (summary->type == ns_t_a) {
		printf("%s. %s:", summary->zone, summary->ns);
		printf(" A lookup failed\n");
		free(summary);
		return;
	}
	if (summary->type == ns_t_aaaa) {
		printf("%s. %s:", summary->zone, summary->ns);
		printf(" AAAA lookup failed\n");
		free(summary);
		return;
	}
	if (summary->type == ns_t_ns) {
		printf("%s. %s:", summary->zone, summary->ns);
		printf(" NS lookup failed\n");
		free(summary);
		return;
	}
	x = -1;
	printf("%s. @%s (%s.):", summary->zone, addrbuf, summary->ns);
	for (i = 0; i < sizeof(opts)/sizeof(opts[0]); i++) {
		if (summary->results[i][0] == 0)
			strcpy(summary->results[i], "skipped");
		if (strcmp(opts[i].name, "do") == 0)
			x = i;
		if (strcmp(opts[i].name, "ednstcp") == 0 && x != -1) {
			printf(" signed=%s", summary->results[x]);
			if (summary->seenrrsig)
				printf(",yes");
		}
		printf(" %s=%s", opts[i].name, summary->results[i]);
	}
	printf("\n");
	free(summary);
}

static void
freeitem(struct workitem * item) {
	report(item->summary);
	if (item->tcpfd != 0) {
		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);
	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);
	free(item);
}

static void
addtag(struct workitem *item, char *tag) {
	char *result = item->summary->results[item->test];
	int i = strlen(result);
	if (i)
		result[i++] = ',';
	strcpy(result + i, tag);
}

static void
resend(struct workitem *item) {
	unsigned int ttl;
	int n, fd = -1;

	switch (item->summary->storage.ss_family) {
	case AF_INET:
		fd = udp4;
		break;
	case AF_INET6:
		fd = udp6;
		break;
	}

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

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

	n = sendto(fd, item->buf, item->buflen, 0,
		   (struct sockaddr *)&item->summary->storage,
		   item->summary->storage.ss_len);
	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);
		if (!item->outstanding++)
			outstanding++;
		gettimeofday(&item->when, NULL);
		item->when.tv_sec += 1;
		item->sends++;
		UNLINK(work, item, link);
		APPEND(work, item, link);
	} else {
		addtag(item, "failed");
		freeitem(item);
	}
}

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static void
dotest(struct workitem *item) {
	unsigned char *cp;
	unsigned int ttl;
	int n, fd, id, tries = 0;

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	switch (item->summary->storage.ss_family) {
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	case AF_INET:
		fd = udp4;
		break;
	case AF_INET6:
		fd = udp6;
		break;
	}

	if (fd == -1) {
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		addtag(item, "skipped");
		freeitem(item);
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		return;
	}
	
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	n = res_mkquery(ns_o_query, item->summary->zone, ns_c_in,
			opts[item->test].type, NULL, 0, NULL,
			item->buf, sizeof(item->buf));
	item->buf[2] &= ~0x1;	/* clear rd */
	if (n > 0) {
		char name[1024];
		dn_expand(item->buf, item->buf + n, item->buf + 12,
			  name, sizeof(name));
		strcpy(item->summary->zone, name);
	}
	
	if (n > 0 && opts[item->test].udpsize > 0) {
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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) {
		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;
		
		if (tries == 0xffff) {
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			addtag(item, "skipped");
			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;
		}

		if (outstanding > maxoutstanding) {
			gettimeofday(&item->when, NULL);
			item->when.tv_sec += 1;
			APPEND(work, item, link);
			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,
			   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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		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");
		freeitem(item);
	}
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}

static void
check(char *zone, char *ns, char *address) {
	size_t i;
	int n, fd;
	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;
		s->sin6_len = sizeof(struct sockaddr_in6);
		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;
		s->sin_len = sizeof(struct sockaddr_in);
		s->sin_family = AF_INET;
		s->sin_port = htons(53);
		s->sin_addr = addr;
		fd = udp4;
	} else
		return;

	if (fd == -1)
		return;

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	summary = calloc(1, sizeof(*summary));
	if (summary == NULL)
		return;
	summary->storage = storage;
	ns_makecanon(zone, summary->zone, sizeof(summary->zone));
	i = strlen(summary->zone);
	if (i) summary->zone[i-1] = 0;
	ns_makecanon(ns, summary->ns, sizeof(summary->ns));
	i = strlen(summary->ns);
	if (i) summary->ns[i-1] = 0;
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	for (i = 0; i < sizeof(opts)/sizeof(opts[0]); i++) {
		struct workitem *item = calloc(1, sizeof(*item));
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		if (item == NULL) {
			summary->tests++;
			report(summary);
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			break;
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		}
		summary->tests++;
		item->summary = summary;
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		item->test = i;
		dotest(item);
	}
}

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static char *
rcodetext(int code) {
	static char buf[64];
	switch(code) {
	case 0: return("noerror");
	case 1: return("formerr");
	case 2: return("servfail");
	case 3: return("nxdomain");
	case 4: return("notimpl");
	case 5: return("refused");
	case 6: return("yxdomain");
	case 7: return("yxrrset");
	case 8: return("nxrrset");
	case 9: return("notauth");
	case 10: return("notzone");
	case 16: return("badvers");
	case 23: return("badcookie");
	default:
		snprintf(buf, sizeof(buf), "?%u", code);
		return (buf);
	}
}

static void
dolookup(struct workitem *item, int type) {
	char name[1024];
	int n, fd = -1;

	item->summary->tests++;
	item->summary->type = item->type = type;

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	if (servers[item->test].sin.sin_family == AF_INET)
		memcpy(&item->summary->storage, &servers[item->test].sin,
		       sizeof(servers[item->test].sin));
	else
		memcpy(&item->summary->storage, &servers[0].sin6,
		       sizeof(servers[item->test].sin6));

	switch (item->summary->storage.ss_family) {
	case AF_INET:
		fd = udp4;
		break;
	case AF_INET6:
		fd = udp6;
		break;
	}

	if (fd == -1) {
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		if (++item->test < nservers)
			goto again;
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
		addtag(item, "skipped");
		freeitem(item);
		return;
	}
	
	if (type == ns_t_ns)
		n = res_mkquery(ns_o_query, item->summary->zone, ns_c_in,
				type, NULL, 0, NULL,
				item->buf, sizeof(item->buf));
	else
		n = res_mkquery(ns_o_query, item->summary->ns, ns_c_in,
				type, NULL, 0, NULL,
				item->buf, sizeof(item->buf));
	if (n > 0) {
		int id = item->buf[0] << 8 | item->buf[1];
		int tries = 0;

		dn_expand(item->buf, item->buf + n, item->buf + 12,
			 name, sizeof(name));
		if (type == ns_t_ns)
			strcpy(item->summary->zone, name);
		else
			strcpy(item->summary->ns, name);

		while (!checkid(&item->summary->storage, id) &&
		       tries++ < 0xffff)
			id = (id + 1) & 0xffff;
		
		if (tries == 0xffff) {
			addtag(item, "skipped");
			freeitem(item);
			return;
		}

		item->buf[0] = id >> 8;
		item->buf[1] = id & 0xff;
		item->id = id;
		item->buflen = n;
		if (outstanding > maxoutstanding) {
			gettimeofday(&item->when, NULL);
			item->when.tv_sec += 1;
			APPEND(work, item, link);
			APPEND(ids[item->id], item, idlink);
			return;
		}
		n = sendto(fd, item->buf, item->buflen, 0,
			   (struct sockaddr *)&item->summary->storage,
			   item->summary->storage.ss_len);
	}
	if (n > 0) {
		if (debug)
			printf("lookup %u id=%u\n", item->type, item->id);
		if (!item->outstanding++)
			outstanding++;
		gettimeofday(&item->when, NULL);
		item->when.tv_sec += 1;
		item->sends++;
		APPEND(work, item, link);
		APPEND(ids[item->id], item, idlink);
	} else {
		addtag(item, "skipped");
		freeitem(item);
	}
}

static struct summary *
lookupa(char *zone, char *ns) {
	struct summary *summary;
	struct workitem *item;
	unsigned int i;

	summary = calloc(1, sizeof(*summary));
	if (summary == NULL)
		return (NULL);

	ns_makecanon(zone, summary->zone, sizeof(summary->zone));
	i = strlen(summary->zone);
	if (i) summary->zone[i-1] = 0;

	ns_makecanon(ns, summary->ns, sizeof(summary->ns));
	i = strlen(summary->ns);
	if (i) summary->ns[i-1] = 0;

	item = calloc(1, sizeof(*item));
	if (item == NULL)
		free(summary);

	item->summary = summary;
	dolookup(item, ns_t_a);
	return (summary);
}

static struct summary *
lookupaaaa(char *zone, char *ns) {
	struct summary *summary;
	struct workitem *item;
	unsigned int i;

	summary = calloc(1, sizeof(*summary));
	if (summary == NULL)
		return (NULL);

	ns_makecanon(zone, summary->zone, sizeof(summary->zone));
	i = strlen(summary->zone);
	if (i) summary->zone[i-1] = 0;

	ns_makecanon(ns, summary->ns, sizeof(summary->ns));
	i = strlen(summary->ns);
	if (i) summary->ns[i-1] = 0;

	item = calloc(1, sizeof(*item));
	if (item == NULL)
		free(summary);

	item->summary = summary;
	dolookup(item, ns_t_aaaa);
	return (summary);
}

static void
lookupns(char *zone) {
	struct summary *summary;
	struct workitem *item;
	unsigned int i;

	summary = calloc(1, sizeof(*summary));
	if (summary == NULL)
		return;
	strcpy(summary->zone, zone);

	item = calloc(1, sizeof(*item));
	if (item == NULL)
		free(summary);

	item->summary = summary;
	dolookup(item, ns_t_ns);
}

static void
process(struct workitem *item, unsigned char *buf, int n) {
	char name[1024], ns[1024];
	unsigned int i, id, qr, aa, tc, rd, ra, z, ad, cd;
	unsigned int qrcount, ancount, aucount, adcount;
	unsigned int opcode, rcode;
	unsigned int type, ednssize = 0, class, ednsttl = 0, ttl, rdlen;
	unsigned char *cp, *eom; 	
	int seenopt = 0, seensoa = 0, seenrrsig = 0;
	int seennsid = 0, seenecs = 0, seenexpire = 0, seencookie = 0;
	int seenecho = 0;
	char addrbuf[64];
	struct sockaddr_in *s = (struct sockaddr_in *)&item->summary->storage;
	struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&item->summary->storage;
	void *addr;
	int ok = 1;

	/* process message header */

	id = buf[0] << 8| buf[1];
	qr = (buf[2] >> 7) & 0x1;
	opcode = (buf[2] >> 3) & 0xf;
	aa = (buf[2] >> 2) & 0x1;
	tc = (buf[2] >> 1) & 0x1;
	rd = buf[2] & 0x1;
	ra = (buf[3] >> 7) & 0x1;
	z = (buf[3] >> 6) & 0x1;
	ad = (buf[3] >> 5) & 0x1;
	cd = (buf[3] >> 4) & 0x1;
	rcode = buf[3] & 0xf;
	qrcount = buf[4] << 8 | buf[5];
	ancount = buf[6] << 8 | buf[7];
	aucount = buf[8] << 8 | buf[9];
	adcount = buf[10] << 8 | buf[11];

	if (tc && !opts[item->test].ignore && item->tcpfd == 0) {
		if (LINKED(item, link))
			UNLINK(work, item, link);
		connecttoserver(item);
		return;
	}

	/* process message body */

	if (item->type == ns_t_a || item->type == ns_t_aaaa)
		strcpy(ns, item->summary->ns);

	cp = buf + 12;
	eom = buf + n;
	for (i = 0; i < qrcount; i++) {
		n = dn_expand(buf, eom, cp, name, sizeof(name));
		if (n < 0 || (eom - cp) < n)
			goto err;
		cp += n;
		if ((eom - cp) < 4)
			goto err;
		type = ns_get16(cp);
		cp += 2;
		class = ns_get16(cp);
		cp += 2;
		if (debug)
			printf("QR: %s./%u/%u\n", name, type, class);

		/*
		 * No address / NS records?
		 */
		if (item->type == ns_t_a && type == ns_t_a &&
		    strcasecmp(item->summary->ns, name) == 0 &&
		    rcode == 0 && ancount == 0) {
			item->summary->done = 1;
			item->summary->nodataa = 1;
		}
		if (item->type == ns_t_aaaa && type == ns_t_aaaa &&
		    strcasecmp(item->summary->ns, name) == 0 &&
		    rcode == 0 && ancount == 0) {
			item->summary->done = 1;
			item->summary->nodataaaa = 1;
		}
		if (item->type == ns_t_ns && type == ns_t_ns &&
		    strcasecmp(item->summary->zone, name) == 0 &&
		    rcode == 0 && ancount == 0)
			item->summary->done = 1;

		/*
		 * NXDOMAIN?
		 */
		if (item->type == ns_t_a && type == ns_t_a &&
		    strcasecmp(item->summary->ns, name) == 0 &&
		    rcode == 3 && ancount == 0)
			item->summary->nxdomaina = 1;
		if (item->type == ns_t_aaaa && type == ns_t_aaaa &&
		    strcasecmp(item->summary->ns, name) == 0 &&
		    rcode == 3 && ancount == 0)
			item->summary->nxdomainaaaa = 1;
		if (item->type == ns_t_ns && type == ns_t_ns &&
		    strcasecmp(item->summary->zone, name) == 0 &&
		    rcode == 3 && ancount == 0)
			item->summary->nxdomain = 1;
	}

	for (i = 0; i < ancount; i++) {
		n = dn_expand(buf, eom, cp, name, sizeof(name));
		if (n < 0 || (eom - cp) < n)
			goto err;
		cp += n;
		if ((eom - cp) < 8)
			goto err;
		type = ns_get16(cp);
		cp += 2;
		class = ns_get16(cp);
		cp += 2;
		ttl = ns_get32(cp);
		cp += 4;
		rdlen = ns_get16(cp);
		cp += 2;
		if ((eom - cp) < rdlen)
			goto err;
		if ((item->type == ns_t_a || item->type == ns_t_aaaa) &&
		    type == ns_t_cname && strcasecmp(ns, name) == 0) {
			n = dn_expand(buf, eom, cp, ns, sizeof(ns));
			if (n != rdlen)
				goto err;
		}
		if (item->type == ns_t_a && type == ns_t_a &&
		    strcasecmp(ns, name) == 0)
		{
			if (rdlen != 4)
				goto err;
			inet_ntop(AF_INET, cp, addrbuf, sizeof(addrbuf));
			check(item->summary->zone, item->summary->ns, addrbuf);
			item->summary->done = 1;
		}
		if (item->type == ns_t_aaaa && type == ns_t_aaaa &&
		    strcasecmp(ns, name) == 0)
		{
			if (rdlen != 16)
				goto err;
			inet_ntop(AF_INET6, cp, addrbuf, sizeof(addrbuf));
			check(item->summary->zone, item->summary->ns, addrbuf);
			item->summary->done = 1;
		}
		if (item->type == ns_t_ns && type == ns_t_ns &&
		    strcasecmp(item->summary->zone, name) == 0)
		{
			struct summary *summarya, *summaryaaaa;
			n = dn_expand(buf, eom, cp, ns, sizeof(ns));
			if (n != rdlen)
				goto err;
			item->summary->done = 1;
			summarya = lookupa(item->summary->zone, ns);
			summaryaaaa = lookupaaaa(item->summary->zone, ns);
			if (summarya && summaryaaaa) {
				summarya->xlink = summaryaaaa;
				summaryaaaa->xlink = summarya;
			}
		}
		cp += rdlen;
		if (type == ns_t_soa &&
		    strcasecmp(item->summary->zone, name) == 0)
			seensoa = 1;
		else if (type == ns_t_soa)
		    printf("%s %s\n", item->summary->zone, name);
		if (type == ns_t_rrsig)
			seenrrsig = 1;
		if (debug)
			printf("AN: %s./%u/%u/%u/%u\n",
			       name, type, class, ttl, rdlen);
	}

	for (i = 0; i < aucount; i++) {
		n = dn_expand(buf, eom, cp, name, sizeof(name));
		if (n < 0 || (eom - cp) < n)
			goto err;
		cp += n;
		if ((eom - cp) < 8)
			goto err;
		type = ns_get16(cp);
		cp += 2;
		class = ns_get16(cp);
		cp += 2;
		ttl = ns_get32(cp);
		cp += 4;
		rdlen = ns_get16(cp);
		cp += 2;
		if ((eom - cp) < rdlen)
			goto err;
		cp += rdlen;
		if (debug)
			printf("AU: %s./%u/%u/%u/%u\n",
			       name, type, class, ttl, rdlen);
	}

	for (i = 0; i < adcount; i++) {
		n = dn_expand(buf, eom, cp, name, sizeof(name));
		if (n < 0 || (eom - cp) < n)
			goto err;
		cp += n;
		if ((eom - cp) < 8)
			goto err;
		type = ns_get16(cp);
		cp += 2;
		class = ns_get16(cp);
		cp += 2;
		ttl = ns_get32(cp);
		cp += 4;
		rdlen = ns_get16(cp);
		cp += 2;
		if ((eom - cp) < rdlen)
			goto err;
		if (type == ns_t_opt && !seenopt) {
			unsigned char *options;
			ednsttl = ttl;
			ednssize = class;
			seenopt = 1;
			options = cp;
			while (((cp + rdlen) - options) >= 4) {
				unsigned int code, optlen;
				code = ns_get16(options);
				options += 2;
				optlen = ns_get16(options);
				options += 2;
				if (code == 3 && optlen > 0)
					seennsid = 1;
				if (code == 8)
					seenecs = 1;
				if (code == 9 && optlen == 4)
					seenexpire = 1;
				if (code == 10 && optlen >= 16 && optlen <= 24)
					seencookie = 1;
				if (code == 100)
					seenecho = 1;
				options += optlen;
			}
			if (options != (cp + rdlen))
				goto err;
		}
		cp += rdlen;
		if (debug)
			printf("AD: %s./%u/%u/%u/%u\n",
			       name, type, class, ttl, rdlen);
	}
	if (cp != eom)
		goto err;

	rcode += (ednsttl & 0xff000000) >> 20;

	if (debug)
		printf("id=%-5u %-9s opcode=%u rcode=%u aa=%u tc=%u rd=%u "
		       "ra=%u z=%u ad=%u cd=%u qrcount=%u ancount=%u "
		       "aucount=%u adcount=%u\n"
		       "\tseensoa=%u seenrrsig=%u seenopt=%u "
		       "seennsid=%u seenecs=%u seenexpire=%u seencookie=%u\n",
		       id, opts[item->test].name, opcode, rcode,
		       aa, tc, rd, ra, z, ad, cd,
		       qrcount, ancount, aucount, adcount,
		       seensoa, seenrrsig, seenopt,
		       seennsid, seenecs, seenexpire, seencookie);
	if (opts[item->test].version == 0)
		if (rcode != 0)
			addtag(item, rcodetext(rcode)), ok = 0;
	if (opts[item->test].version != 0)
		if (rcode != 16) /* badvers */
			addtag(item, rcodetext(rcode)), ok = 0;
	if ((ednsttl & 0xff0000) != 0)
		addtag(item, "badversion"), ok = 0;
	if (opts[item->test].type == ns_t_soa)
		if (opts[item->test].version == 0 &&
		    !opts[item->test].ignore && !seensoa)
			addtag(item, "nosoa"), ok = 0;
	if (opts[item->test].type == ns_t_soa)
		if (opts[item->test].version != 0 && seensoa)
			addtag(item, "soa"), ok = 0;
	if (seenecho)
		addtag(item, "echoed"), ok = 0;
	if ((ednsttl & 0x8000) == 0 && seenrrsig)
		addtag(item, "nodo"), ok = 0;
	if ((ednsttl & 0x7fff) != 0)
		addtag(item, "mbz"), ok = 0;
	if (seenrrsig)
		item->summary->seenrrsig = 1;
	if (ok)
		addtag(item, "ok");
	if (seennsid)
		addtag(item, "nsid");
	if (seenexpire)
		addtag(item, "expire");
	if (seencookie)
		addtag(item, "cookie");
	if (seenecs)
		addtag(item, "subnet");
		
	goto done;
 err:
	addtag(item, "malformed");
 done:
	freeitem(item);
}

static void
tcpread(int fd) {
	struct workitem *item;
	int n;

	item = HEAD(reading);
	while (item && item->tcpfd != fd)
		item = NEXT(item, rlink);
	if (item == NULL)
		return;
 again:
	n = read(fd, item->tcpbuf + item->read, item->readlen - item->read);
	if (n == 0) {
		addtag(item, "eof");
		freeitem(item);
		return;
	}
	if (n < 0 && (errno == EAGAIN || errno == EINTR))
		return;
	if (n < 0) {
		if (errno == ECONNRESET)
			addtag(item, "reset");
		else if (errno == EPIPE)
			addtag(item, "pipe");
		else 
			addtag(item, "read");
		freeitem(item);
		return;
	} 
	item->read += n;
	if (item->read == item->readlen) {
		if (!item->havelen) {
			item->readlen = item->tcpbuf[0] << 8 | item->tcpbuf[1];
			item->havelen = 1;
			item->read = 0;
			goto again;
		}
		process(item, item->tcpbuf, item->readlen);
	}
}

static void
startread(struct workitem *item) {
	struct iovec iov[2];
	int iovcnt = 2;
	unsigned char buf[2];
	int n;

	FD_SET(item->tcpfd, &rfds);
	if (item->tcpfd > maxfd)
		maxfd = item->tcpfd;
	rhandlers[item->tcpfd] = tcpread;
	gettimeofday(&item->when, NULL);
	item->when.tv_sec += 10;
	APPEND(reading, item, rlink);
	item->havelen = 0;
	item->readlen = 2;
	item->read = 0;

	buf[0] = item->buflen>>8;
	buf[1] = item->buflen&0xff;
	iov[0].iov_base = &buf;
	iov[0].iov_len = 2;
	iov[1].iov_base = &item->buf;
	iov[1].iov_len = item->buflen;
	n = writev(item->tcpfd, iov, iovcnt);
	if (n != 2 + item->buflen) {
		addtag(item, "writev");
		freeitem(item);
	}
}

static void
connectdone(int fd) {
	struct workitem *item;
	socklen_t optlen;
	int cc;
	int n;

	item = HEAD(connecting);
	while (item && item->tcpfd != fd)
		item = NEXT(item, clink);
	if (item == NULL)
		return;

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	optlen = sizeof(cc);
	if (getsockopt(item->tcpfd, SOL_SOCKET, SO_ERROR,
		       (void *)&cc, (void *)&optlen) < 0)
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		cc = errno;
	if (cc != 0) {
		if (cc == ECONNRESET)
			addtag(item, "reset");
		else if (cc == ECONNREFUSED)
			addtag(item, "connection-refused");
		else
			addtag(item, "failed");
		freeitem(item);
		return;
	}
	UNLINK(connecting, item, clink);
	FD_CLR(item->tcpfd, &wfds);
	whandlers[item->tcpfd] = NULL;
	startread(item);
}

static void
connecttoserver(struct workitem *item) {
	int fd, n, on = 1;

	fd = socket(item->summary->storage.ss_family,
		    SOCK_STREAM, IPPROTO_TCP);
	if (fd == -1) {
		addtag(item, "failed");
		freeitem(item);
		return;
	}
	n = ioctl(fd, FIONBIO, (void *)&on);
	if (n == -1) {
		close(fd);
		addtag(item, "failed");
		freeitem(item);
		return;
	}
	n = setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&on, sizeof(on));
	if (n == -1) {
		close(fd);
		addtag(item, "failed");
		freeitem(item);
		return;
	}
	n = connect(fd, (struct sockaddr *)&item->summary->storage,
		    item->summary->storage.ss_len);
	if (n == -1 && errno == EINPROGRESS) {
		if (!item->outstanding++)
			outstanding++;
		item->tcpfd = fd;
		whandlers[fd] = connectdone;
		FD_SET(fd, &wfds);
		if (fd > maxfd)
			maxfd = fd;
		gettimeofday(&item->when, NULL);
		item->when.tv_sec += 60;
		APPEND(connecting, item, clink);
		return;
	} 
	if (n == -1) {
		if (errno == ECONNRESET)
			addtag(item, "reset");
		else if (errno == ECONNREFUSED)
			addtag(item, "connection-refused");
		else
			addtag(item, "failed");
		close(fd);
		freeitem(item);
		return;
	}
	if (!item->outstanding++)
		outstanding++;
	item->tcpfd = fd;
	startread(item);
}

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static void
readstdin(int fd) {
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	char line[4096];
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	char zone[1204];
	char ns[1204];
	char address[1204];
	int n;

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	if (outstanding > maxoutstanding / 2)
		return;

	if (fgets(line, sizeof(line), stdin) == NULL) {
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		eof = 1;
		FD_CLR(0, &rfds);
		for (fd = maxfd; fd >= 0; fd--) {
			if (FD_ISSET(fd, &rfds) || FD_ISSET(fd, &wfds)) {
				break;
			}
		}
		maxfd = fd;
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		return;
	}
	n = sscanf(line, "%1024s%1024s%1024s", zone, ns, address);
	if (n == 3)
		check(zone, ns, address);
	if (n == 2) {
		struct summary *summarya, *summaryaaaa;
		summarya = lookupa(zone, ns);
		summaryaaaa = lookupaaaa(zone, ns);
		if (summarya && summaryaaaa) {
			summarya->xlink = summaryaaaa;
			summaryaaaa->xlink = summarya;
		}
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	}
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	if (n == 1)
		lookupns(zone);
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}

static void
udpread(int fd) {
	struct workitem *item;
	struct sockaddr_storage storage;
	socklen_t len = sizeof(storage);
	unsigned char buf[4096];
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	int n;
	unsigned int id, qr;

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	n = recvfrom(fd, buf, sizeof(buf), 0,
		     (struct sockaddr *)&storage, &len);
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	if (n < 12)
		return;

	qr = (buf[2] & 0x80) != 0;
	if (!qr)
		return;

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	id = buf[0] << 8| buf[1];
	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);

	/* Late response? */
	if (item == NULL)
		return;

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	process(item, buf, n);
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}

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static void
nextserver(struct workitem *item) {
	struct sockaddr_storage storage;
	int id, tries;
	
 again:
	if (++item->test > nservers) {
		addtag(item, "timeout");
		freeitem(item);
		return;
	}

	switch(servers[item->test].sin.sin_family) {
	case AF_INET:
		if (udp4 == -1)
			goto again;
		memcpy(&storage, &servers[item->test].sin,
		       sizeof(servers[item->test].sin));
		break;
	case AF_INET6:
		if (udp6 == -1)
			goto again;
		memcpy(&storage, &servers[0].sin6,
		       sizeof(servers[item->test].sin6));
		break;
	default:
		goto again;
	}

	/*
	 * Find a new query id if required.
	 */
	id = item->id;
	tries = 0;
	while (!checkid(&storage, id) && tries++ < 0xffff)
		id = (id + 1) & 0xffff;
	if (tries == 0xffff) 
		goto again;

	if (id != item->id) {
		UNLINK(ids[item->id], item, idlink);
		item->buf[0] = id >> 8;
		item->buf[1] = id & 0xff;
		item->id = id;
		APPEND(ids[item->id], item, idlink);
	}

	item->summary->storage = storage;
	item->sends = 0;
	resend(item);
}

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int
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main(int argc, char **argv) {
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	struct timeval now, to, *tpo = NULL;
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	struct workitem *item = NULL, *citem, *ritem;
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	fd_set myrfds, mywfds;
	int n;
	int fd;
	int nfds = 0;
	int done = 0;

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	if (argc > 1)
		debug = 1;

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	FD_ZERO(&rfds);
	FD_ZERO(&wfds);

	FD_SET(0, &rfds);
	maxfd = 0;
	rhandlers[0] = readstdin;

	udp4 = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (udp4 >= 0) {
		FD_SET(udp4, &rfds);
		if (udp4 > maxfd)
			maxfd = udp4;
		rhandlers[udp4] = udpread;
	}

	udp6 = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
	if (udp6 >= 0) {
		FD_SET(udp6, &rfds);
		if (udp6 > maxfd)
			maxfd = udp6;
		rhandlers[udp6] = udpread;
	}

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	res_init();
	nservers = res_getservers(&_res, servers,
				  sizeof(servers)/sizeof(servers[0]));

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	do {
		FD_COPY(&rfds, &myrfds);
		FD_COPY(&wfds, &mywfds);
		nfds = maxfd + 1;
		if (item) {
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			to.tv_sec = item->when.tv_sec - now.tv_sec;
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			to.tv_usec = item->when.tv_usec - now.tv_usec;
			if (to.tv_usec < 0) {
				to.tv_usec += 1000000;
				to.tv_sec -= 1;
			}
			if (to.tv_sec < 0) {
				to.tv_sec = 0;
				to.tv_usec = 0;
			}
			tpo = &to;
		} else
			tpo = NULL;
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		if (outstanding > maxoutstanding/2)
			FD_CLR(0, &myrfds);
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		n = select(nfds, &myrfds, &mywfds, NULL, tpo);
		if (n > 0) {
			for (fd = 0; fd <= maxfd; fd++) {
				if (FD_ISSET(fd, &myrfds) &&
				    rhandlers[fd] != NULL) 
					(*rhandlers[fd])(fd);
				if (FD_ISSET(fd, &mywfds) &&
				    whandlers[fd] != NULL) 
					(*whandlers[fd])(fd);
			}
		}
		item = HEAD(work);
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		ritem = HEAD(reading);
		citem = HEAD(connecting);
		if (item || citem || ritem)
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			gettimeofday(&now, NULL);
		while (item) {
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			if (item->when.tv_sec > now.tv_sec ||
			    (item->when.tv_sec == now.tv_sec &&
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			     item->when.tv_usec > now.tv_usec))
				break;
			if (item->sends < 3) {
				resend(item);
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			} else if (item->type) {
				nextserver(item);
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			} else {
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				addtag(item, "timeout");
				freeitem(item);
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			}
			item = HEAD(work);
		}
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		while (citem) {
			if (citem->when.tv_sec > now.tv_sec ||
			    (citem->when.tv_sec == now.tv_sec &&
			     citem->when.tv_usec > now.tv_usec))
				break;
			addtag(citem, "timeout");
			freeitem(citem);
			citem = HEAD(connecting);
		}
		if (item && citem) {
			if (citem->when.tv_sec < item->when.tv_sec ||
			    (citem->when.tv_sec == item->when.tv_sec &&
			     citem->when.tv_usec < item->when.tv_usec))
				item = citem;
		} else if (item == NULL)
			item = citem;
		while (ritem) {
			if (ritem->when.tv_sec > now.tv_sec ||
			    (ritem->when.tv_sec == now.tv_sec &&
			     ritem->when.tv_usec > now.tv_usec))
				break;
			addtag(ritem, "timeout");
			freeitem(ritem);
			ritem = HEAD(reading);
		}
		if (item && ritem) {
			if (ritem->when.tv_sec < item->when.tv_sec ||
			    (ritem->when.tv_sec == item->when.tv_sec &&
			     ritem->when.tv_usec < item->when.tv_usec))
				item = ritem;
		} else if (item == NULL)
			item = ritem;

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		if (eof && item == NULL)
			done = 1;
	} while (!done);
}