*** empty log message ***

1 files changed, 0 insertions, 3115 deletions

diff --git a/evdns.c b/evdns.c
index c12b4f6..e69de29 100644
--- a/evdns.c
+++ b/evdns.c
@@ -1,3115 +0,0 @@
-/* $Id: evdns.c,v 1.16 2007-11-06 16:09:37 root Exp $ */
-
-/* The original version of this module was written by Adam Langley; for
- * a history of modifications, check out the subversion logs.
- *
- * When editing this module, try to keep it re-mergeable by Adam.  Don't
- * reformat the whitespace, add Tor dependencies, or so on.
- *
- * TODO:
- *   - Support IPv6 and PTR records.
- *   - Replace all externally visible magic numbers with #defined constants.
- *   - Write doccumentation for APIs of all external functions.
- */
-
-/* Async DNS Library
- * Adam Langley <agl@imperialviolet.org>
- * http://www.imperialviolet.org/eventdns.html
- * Public Domain code
- *
- * This software is Public Domain. To view a copy of the public domain dedication,
- * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to
- * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
- *
- * I ask and expect, but do not require, that all derivative works contain an
- * attribution similar to:
- * 	Parts developed by Adam Langley <agl@imperialviolet.org>
- *
- * You may wish to replace the word "Parts" with something else depending on
- * the amount of original code.
- *
- * (Derivative works does not include programs which link against, run or include
- * the source verbatim in their source distributions)
- *
- * Version: 0.1b
- */
-
-#include <sys/types.h>
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#ifdef WIN32
-#ifndef EV_STANDALONE
-#include "misc.h"
-#endif
-#endif
-
-/* #define NDEBUG */
-
-#ifndef DNS_USE_CPU_CLOCK_FOR_ID
-#ifndef DNS_USE_GETTIMEOFDAY_FOR_ID
-#ifndef DNS_USE_OPENSSL_FOR_ID
-#error Must configure at least one id generation method.
-#error Please see the documentation.
-#endif
-#endif
-#endif
-
-/* #define _POSIX_C_SOURCE 200507 */
-#define _GNU_SOURCE
-
-#ifdef DNS_USE_CPU_CLOCK_FOR_ID
-#ifdef DNS_USE_OPENSSL_FOR_ID
-#error Multiple id options selected
-#endif
-#ifdef DNS_USE_GETTIMEOFDAY_FOR_ID
-#error Multiple id options selected
-#endif
-#include <time.h>
-#endif
-
-#ifdef DNS_USE_OPENSSL_FOR_ID
-#ifdef DNS_USE_GETTIMEOFDAY_FOR_ID
-#error Multiple id options selected
-#endif
-#include <openssl/rand.h>
-#endif
-
-#define _FORTIFY_SOURCE 3
-
-#include <string.h>
-#include <fcntl.h>
-#ifdef HAVE_STDINT_H
-#include <stdint.h>
-#endif
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <assert.h>
-#include <limits.h>
-#include <sys/stat.h>
-#include <ctype.h>
-#include <stdio.h>
-#include <stdarg.h>
-
-#include "evdns.h"
-#ifdef WIN32
-#include <windows.h>
-#include <winsock2.h>
-#include <iphlpapi.h>
-#else
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#endif
-
-#ifdef HAVE_NETINET_IN6_H
-#include <netinet/in6.h>
-#endif
-
-#ifdef WIN32
-typedef int socklen_t;
-#endif
-
-#define EVDNS_LOG_DEBUG 0
-#define EVDNS_LOG_WARN 1
-
-#ifndef HOST_NAME_MAX
-#define HOST_NAME_MAX 255
-#endif
-
-#ifndef NDEBUG
-#include <stdio.h>
-#endif
-
-#undef MIN
-#define MIN(a,b) ((a)<(b)?(a):(b))
-
-#ifdef __USE_ISOC99B
-/* libevent doesn't work without this */
-typedef uint8_t u_char;
-typedef unsigned int uint;
-#endif
-#include <event.h>
-
-#define u64 uint64_t
-#define u32 uint32_t
-#define u16 uint16_t
-#define u8  uint8_t
-
-#define MAX_ADDRS 4  /* maximum number of addresses from a single packet */
-/* which we bother recording */
-
-#define TYPE_A         EVDNS_TYPE_A
-#define TYPE_CNAME     5
-#define TYPE_PTR       EVDNS_TYPE_PTR
-#define TYPE_AAAA      EVDNS_TYPE_AAAA
-
-#define CLASS_INET     EVDNS_CLASS_INET
-
-struct request {
-	u8 *request;  /* the dns packet data */
-	unsigned int request_len;
-	int reissue_count;
-	int tx_count;  /* the number of times that this packet has been sent */
-	unsigned int request_type; /* TYPE_PTR or TYPE_A */
-	void *user_pointer;  /* the pointer given to us for this request */
-	evdns_callback_type user_callback;
-	struct nameserver *ns;  /* the server which we last sent it */
-
-	/* elements used by the searching code */
-	int search_index;
-	struct search_state *search_state;
-	char *search_origname;  /* needs to be free()ed */
-	int search_flags;
-
-	/* these objects are kept in a circular list */
-	struct request *next, *prev;
-
-	struct event timeout_event;
-
-	u16 trans_id;  /* the transaction id */
-	char request_appended;  /* true if the request pointer is data which follows this struct */
-	char transmit_me;  /* needs to be transmitted */
-};
-
-#ifndef HAVE_STRUCT_IN6_ADDR
-struct in6_addr {
-	u8 s6_addr[16];
-};
-#endif
-
-struct reply {
-	unsigned int type;
-	unsigned int have_answer;
-	union {
-		struct {
-			u32 addrcount;
-			u32 addresses[MAX_ADDRS];
-		} a;
-		struct {
-			u32 addrcount;
-			struct in6_addr addresses[MAX_ADDRS];
-		} aaaa;
-		struct {
-			char name[HOST_NAME_MAX];
-		} ptr;
-	} data;
-};
-
-struct nameserver {
-	int socket;  /* a connected UDP socket */
-	u32 address;
-	int failed_times;  /* number of times which we have given this server a chance */
-	int timedout;  /* number of times in a row a request has timed out */
-	struct event event;
-	/* these objects are kept in a circular list */
-	struct nameserver *next, *prev;
-	struct event timeout_event;  /* used to keep the timeout for */
-				     /* when we next probe this server. */
-				     /* Valid if state == 0 */
-	char state;  /* zero if we think that this server is down */
-	char choked;  /* true if we have an EAGAIN from this server's socket */
-	char write_waiting;  /* true if we are waiting for EV_WRITE events */
-};
-
-static struct request *req_head = NULL, *req_waiting_head = NULL;
-static struct nameserver *server_head = NULL;
-
-/* Represents a local port where we're listening for DNS requests. Right now, */
-/* only UDP is supported. */
-struct evdns_server_port {
-	int socket; /* socket we use to read queries and write replies. */
-	int refcnt; /* reference count. */
-	char choked; /* Are we currently blocked from writing? */
-	char closing; /* Are we trying to close this port, pending writes? */
-	evdns_request_callback_fn_type user_callback; /* Fn to handle requests */
-	void *user_data; /* Opaque pointer passed to user_callback */
-	struct event event; /* Read/write event */
-	/* circular list of replies that we want to write. */
-	struct server_request *pending_replies;
-};
-
-/* Represents part of a reply being built.	(That is, a single RR.) */
-struct server_reply_item {
-	struct server_reply_item *next; /* next item in sequence. */
-	char *name; /* name part of the RR */
-	u16 type : 16; /* The RR type */
-	u16 class : 16; /* The RR class (usually CLASS_INET) */
-	u32 ttl; /* The RR TTL */
-	char is_name; /* True iff data is a label */
-	u16 datalen; /* Length of data; -1 if data is a label */
-	void *data; /* The contents of the RR */
-};
-
-/* Represents a request that we've received as a DNS server, and holds */
-/* the components of the reply as we're constructing it. */
-struct server_request {
-	/* Pointers to the next and previous entries on the list of replies */
-	/* that we're waiting to write.	 Only set if we have tried to respond */
-	/* and gotten EAGAIN. */
-	struct server_request *next_pending;
-	struct server_request *prev_pending;
-
-	u16 trans_id; /* Transaction id. */
-	struct evdns_server_port *port; /* Which port received this request on? */
-	struct sockaddr_storage addr; /* Where to send the response */
-	socklen_t addrlen; /* length of addr */
-
-	int n_answer; /* how many answer RRs have been set? */
-	int n_authority; /* how many authority RRs have been set? */
-	int n_additional; /* how many additional RRs have been set? */
-
-	struct server_reply_item *answer; /* linked list of answer RRs */
-	struct server_reply_item *authority; /* linked list of authority RRs */
-	struct server_reply_item *additional; /* linked list of additional RRs */
-
-	/* Constructed response.  Only set once we're ready to send a reply. */
-	/* Once this is set, the RR fields are cleared, and no more should be set. */
-	char *response;
-	size_t response_len;
-
-	/* Caller-visible fields: flags, questions. */
-	struct evdns_server_request base;
-};
-
-/* helper macro */
-#define OFFSET_OF(st, member) ((off_t) (((char*)&((st*)0)->member)-(char*)0))
-
-/* Given a pointer to an evdns_server_request, get the corresponding */
-/* server_request. */
-#define TO_SERVER_REQUEST(base_ptr)										\
-	((struct server_request*)											\
-	 (((char*)(base_ptr) - OFFSET_OF(struct server_request, base))))
-
-/* The number of good nameservers that we have */
-static int global_good_nameservers = 0;
-
-/* inflight requests are contained in the req_head list */
-/* and are actually going out across the network */
-static int global_requests_inflight = 0;
-/* requests which aren't inflight are in the waiting list */
-/* and are counted here */
-static int global_requests_waiting = 0;
-
-static int global_max_requests_inflight = 64;
-
-static struct timeval global_timeout = {5, 0};  /* 5 seconds */
-static int global_max_reissues = 1;  /* a reissue occurs when we get some errors from the server */
-static int global_max_retransmits = 3;  /* number of times we'll retransmit a request which timed out */
-/* number of timeouts in a row before we consider this server to be down */
-static int global_max_nameserver_timeout = 3;
-
-/* These are the timeout values for nameservers. If we find a nameserver is down */
-/* we try to probe it at intervals as given below. Values are in seconds. */
-static const struct timeval global_nameserver_timeouts[] = {{10, 0}, {60, 0}, {300, 0}, {900, 0}, {3600, 0}};
-static const int global_nameserver_timeouts_length = sizeof(global_nameserver_timeouts)/sizeof(struct timeval);
-
-static struct nameserver *nameserver_pick(void);
-static void evdns_request_insert(struct request *req, struct request **head);
-static void nameserver_ready_callback(int fd, short events, void *arg);
-static int evdns_transmit(void);
-static int evdns_request_transmit(struct request *req);
-static void nameserver_send_probe(struct nameserver *const ns);
-static void search_request_finished(struct request *const);
-static int search_try_next(struct request *const req);
-static int search_request_new(int type, const char *const name, int flags, evdns_callback_type user_callback, void *user_arg);
-static void evdns_requests_pump_waiting_queue(void);
-static u16 transaction_id_pick(void);
-static struct request *request_new(int type, const char *name, int flags, evdns_callback_type callback, void *ptr);
-static void request_submit(struct request *req);
-
-static int server_request_free(struct server_request *req);
-static void server_request_free_answers(struct server_request *req);
-static void server_port_free(struct evdns_server_port *port);
-static void server_port_ready_callback(int fd, short events, void *arg);
-
-static int strtoint(const char *const str);
-
-#ifdef WIN32
-static int
-last_error(int sock)
-{
-	int optval, optvallen=sizeof(optval);
-	int err = WSAGetLastError();
-	if (err == WSAEWOULDBLOCK && sock >= 0) {
-		if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&optval,
-			       &optvallen))
-			return err;
-		if (optval)
-			return optval;
-	}
-	return err;
-
-}
-static int
-error_is_eagain(int err)
-{
-	return err == EAGAIN || err == WSAEWOULDBLOCK;
-}
-static int
-inet_aton(const char *c, struct in_addr *addr)
-{
-	uint32_t r;
-	if (strcmp(c, "255.255.255.255") == 0) {
-		addr->s_addr = 0xffffffffu;
-	} else {
-		r = inet_addr(c);
-		if (r == INADDR_NONE)
-			return 0;
-		addr->s_addr = r;
-	}
-	return 1;
-}
-#define CLOSE_SOCKET(x) closesocket(x)
-#else
-#define last_error(sock) (errno)
-#define error_is_eagain(err) ((err) == EAGAIN)
-#define CLOSE_SOCKET(x) close(x)
-#endif
-
-#define ISSPACE(c) isspace((int)(unsigned char)(c))
-#define ISDIGIT(c) isdigit((int)(unsigned char)(c))
-
-#ifndef NDEBUG
-static const char *
-debug_ntoa(u32 address)
-{
-	static char buf[32];
-	u32 a = ntohl(address);
-	snprintf(buf, sizeof(buf), "%d.%d.%d.%d",
-                      (int)(u8)((a>>24)&0xff),
-                      (int)(u8)((a>>16)&0xff),
-                      (int)(u8)((a>>8 )&0xff),
-  		      (int)(u8)((a    )&0xff));
-	return buf;
-}
-#endif
-
-static evdns_debug_log_fn_type evdns_log_fn = NULL;
-
-void
-evdns_set_log_fn(evdns_debug_log_fn_type fn)
-{
-  evdns_log_fn = fn;
-}
-
-#ifdef __GNUC__
-#define EVDNS_LOG_CHECK  __attribute__ ((format(printf, 2, 3)))
-#else
-#define EVDNS_LOG_CHECK
-#endif
-
-static void _evdns_log(int warn, const char *fmt, ...) EVDNS_LOG_CHECK;
-static void
-_evdns_log(int warn, const char *fmt, ...)
-{
-  va_list args;
-  static char buf[512];
-  if (!evdns_log_fn)
-    return;
-  va_start(args,fmt);
-#ifdef WIN32
-  _vsnprintf(buf, sizeof(buf), fmt, args);
-#else
-  vsnprintf(buf, sizeof(buf), fmt, args);
-#endif
-  buf[sizeof(buf)-1] = '\0';
-  evdns_log_fn(warn, buf);
-  va_end(args);
-}
-
-#define log _evdns_log
-
-/* This walks the list of inflight requests to find the */
-/* one with a matching transaction id. Returns NULL on */
-/* failure */
-static struct request *
-request_find_from_trans_id(u16 trans_id) {
-	struct request *req = req_head, *const started_at = req_head;
-
-	if (req) {
-		do {
-			if (req->trans_id == trans_id) return req;
-			req = req->next;
-		} while (req != started_at);
-	}
-
-	return NULL;
-}
-
-/* a libevent callback function which is called when a nameserver */
-/* has gone down and we want to test if it has came back to life yet */
-static void
-nameserver_prod_callback(int fd, short events, void *arg) {
-	struct nameserver *const ns = (struct nameserver *) arg;
-        (void)fd;
-        (void)events;
-
-	nameserver_send_probe(ns);
-}
-
-/* a libevent callback which is called when a nameserver probe (to see if */
-/* it has come back to life) times out. We increment the count of failed_times */
-/* and wait longer to send the next probe packet. */
-static void
-nameserver_probe_failed(struct nameserver *const ns) {
-	const struct timeval * timeout;
-	(void) evtimer_del(&ns->timeout_event);
-	if (ns->state == 1) {
-		/* This can happen if the nameserver acts in a way which makes us mark */
-		/* it as bad and then starts sending good replies. */
-		return;
-	}
-
-	timeout =
-	  &global_nameserver_timeouts[MIN(ns->failed_times,
-					  global_nameserver_timeouts_length - 1)];
-	ns->failed_times++;
-
-	evtimer_set(&ns->timeout_event, nameserver_prod_callback, ns);
-	if (evtimer_add(&ns->timeout_event, (struct timeval *) timeout) < 0) {
-          log(EVDNS_LOG_WARN,
-              "Error from libevent when adding timer event for %s",
-              debug_ntoa(ns->address));
-          /* ???? Do more? */
-        }
-}
-
-/* called when a nameserver has been deemed to have failed. For example, too */
-/* many packets have timed out etc */
-static void
-nameserver_failed(struct nameserver *const ns, const char *msg) {
-	struct request *req, *started_at;
-	/* if this nameserver has already been marked as failed */
-	/* then don't do anything */
-	if (!ns->state) return;
-
-	log(EVDNS_LOG_WARN, "Nameserver %s has failed: %s",
-            debug_ntoa(ns->address), msg);
-	global_good_nameservers--;
-	assert(global_good_nameservers >= 0);
-	if (global_good_nameservers == 0) {
-		log(EVDNS_LOG_WARN, "All nameservers have failed");
-	}
-
-	ns->state = 0;
-	ns->failed_times = 1;
-
-	evtimer_set(&ns->timeout_event, nameserver_prod_callback, ns);
-	if (evtimer_add(&ns->timeout_event, (struct timeval *) &global_nameserver_timeouts[0]) < 0) {
-		log(EVDNS_LOG_WARN,
-		    "Error from libevent when adding timer event for %s",
-		    debug_ntoa(ns->address));
-		/* ???? Do more? */
-        }
-
-	/* walk the list of inflight requests to see if any can be reassigned to */
-	/* a different server. Requests in the waiting queue don't have a */
-	/* nameserver assigned yet */
-
-	/* if we don't have *any* good nameservers then there's no point */
-	/* trying to reassign requests to one */
-	if (!global_good_nameservers) return;
-
-	req = req_head;
-	started_at = req_head;
-	if (req) {
-		do {
-			if (req->tx_count == 0 && req->ns == ns) {
-				/* still waiting to go out, can be moved */
-				/* to another server */
-				req->ns = nameserver_pick();
-			}
-			req = req->next;
-		} while (req != started_at);
-	}
-}
-
-static void
-nameserver_up(struct nameserver *const ns) {
-	if (ns->state) return;
-	log(EVDNS_LOG_WARN, "Nameserver %s is back up",
-	    debug_ntoa(ns->address));
-	evtimer_del(&ns->timeout_event);
-	ns->state = 1;
-	ns->failed_times = 0;
-	ns->timedout = 0;
-	global_good_nameservers++;
-}
-
-static void
-request_trans_id_set(struct request *const req, const u16 trans_id) {
-	req->trans_id = trans_id;
-	*((u16 *) req->request) = htons(trans_id);
-}
-
-/* Called to remove a request from a list and dealloc it. */
-/* head is a pointer to the head of the list it should be */
-/* removed from or NULL if the request isn't in a list. */
-static void
-request_finished(struct request *const req, struct request **head) {
-	if (head) {
-		if (req->next == req) {
-			/* only item in the list */
-			*head = NULL;
-		} else {
-			req->next->prev = req->prev;
-			req->prev->next = req->next;
-			if (*head == req) *head = req->next;
-		}
-	}
-
-	log(EVDNS_LOG_DEBUG, "Removing timeout for request %lx",
-	    (unsigned long) req);
-	evtimer_del(&req->timeout_event);
-
-	search_request_finished(req);
-	global_requests_inflight--;
-
-	if (!req->request_appended) {
-		/* need to free the request data on it's own */
-		free(req->request);
-	} else {
-		/* the request data is appended onto the header */
-		/* so everything gets free()ed when we: */
-	}
-
-	free(req);
-
-	evdns_requests_pump_waiting_queue();
-}
-
-/* This is called when a server returns a funny error code. */
-/* We try the request again with another server. */
-/* */
-/* return: */
-/*   0 ok */
-/*   1 failed/reissue is pointless */
-static int
-request_reissue(struct request *req) {
-	const struct nameserver *const last_ns = req->ns;
-	/* the last nameserver should have been marked as failing */
-	/* by the caller of this function, therefore pick will try */
-	/* not to return it */
-	req->ns = nameserver_pick();
-	if (req->ns == last_ns) {
-		/* ... but pick did return it */
-		/* not a lot of point in trying again with the */
-		/* same server */
-		return 1;
-	}
-
-	req->reissue_count++;
-	req->tx_count = 0;
-	req->transmit_me = 1;
-
-	return 0;
-}
-
-/* this function looks for space on the inflight queue and promotes */
-/* requests from the waiting queue if it can. */
-static void
-evdns_requests_pump_waiting_queue(void) {
-	while (global_requests_inflight < global_max_requests_inflight &&
-	    global_requests_waiting) {
-		struct request *req;
-		/* move a request from the waiting queue to the inflight queue */
-		assert(req_waiting_head);
-		if (req_waiting_head->next == req_waiting_head) {
-			/* only one item in the queue */
-			req = req_waiting_head;
-			req_waiting_head = NULL;
-		} else {
-			req = req_waiting_head;
-			req->next->prev = req->prev;
-			req->prev->next = req->next;
-			req_waiting_head = req->next;
-		}
-
-		global_requests_waiting--;
-		global_requests_inflight++;
-
-		req->ns = nameserver_pick();
-		request_trans_id_set(req, transaction_id_pick());
-
-		evdns_request_insert(req, &req_head);
-		evdns_request_transmit(req);
-		evdns_transmit();
-	}
-}
-
-static void
-reply_callback(struct request *const req, u32 ttl, u32 err, struct reply *reply) {
-	switch (req->request_type) {
-	case TYPE_A:
-		if (reply)
-			req->user_callback(DNS_ERR_NONE, DNS_IPv4_A,
-							   reply->data.a.addrcount, ttl,
-						 reply->data.a.addresses,
-							   req->user_pointer);
-		else
-			req->user_callback(err, 0, 0, 0, NULL, req->user_pointer);
-		return;
-	case TYPE_PTR:
-		if (reply) {
-			char *name = reply->data.ptr.name;
-			req->user_callback(DNS_ERR_NONE, DNS_PTR, 1, ttl,
-							   &name, req->user_pointer);
-		} else {
-			req->user_callback(err, 0, 0, 0, NULL,
-							   req->user_pointer);
-		}
-		return;
-	case TYPE_AAAA:
-		if (reply)
-			req->user_callback(DNS_ERR_NONE, DNS_IPv6_AAAA,
-							   reply->data.aaaa.addrcount, ttl,
-							   reply->data.aaaa.addresses,
-							   req->user_pointer);
-		else
-			req->user_callback(err, 0, 0, 0, NULL, req->user_pointer);
-                return;
-	}
-	assert(0);
-}
-
-/* this processes a parsed reply packet */
-static void
-reply_handle(struct request *const req, u16 flags, u32 ttl, struct reply *reply) {
-	int error;
-	static const int error_codes[] = {DNS_ERR_FORMAT, DNS_ERR_SERVERFAILED, DNS_ERR_NOTEXIST, DNS_ERR_NOTIMPL, DNS_ERR_REFUSED};
-
-	if (flags & 0x020f || !reply || !reply->have_answer) {
-		/* there was an error */
-		if (flags & 0x0200) {
-			error = DNS_ERR_TRUNCATED;
-		} else {
-			u16 error_code = (flags & 0x000f) - 1;
-			if (error_code > 4) {
-				error = DNS_ERR_UNKNOWN;
-			} else {
-				error = error_codes[error_code];
-			}
-		}
-
-		switch(error) {
-		case DNS_ERR_NOTIMPL:
-		case DNS_ERR_REFUSED:
-			/* we regard these errors as marking a bad nameserver */
-			if (req->reissue_count < global_max_reissues) {
-				char msg[64];
-				snprintf(msg, sizeof(msg), "Bad response %d (%s)",
-					 error, evdns_err_to_string(error));
-				nameserver_failed(req->ns, msg);
-				if (!request_reissue(req)) return;
-			}
-			break;
-		case DNS_ERR_SERVERFAILED:
-			/* rcode 2 (servfailed) sometimes means "we are broken" and
-			 * sometimes (with some binds) means "that request was very
-			 * confusing."  Treat this as a timeout, not a failure. 
-			 */
-			log(EVDNS_LOG_DEBUG, "Got a SERVERFAILED from nameserver %s; "
-				"will allow the request to time out.",
-				debug_ntoa(req->ns->address));
-			break;
-		default:
-			/* we got a good reply from the nameserver */
-			nameserver_up(req->ns);
-		}
-
-		if (req->search_state && req->request_type != TYPE_PTR) {
-			/* if we have a list of domains to search in, try the next one */
-			if (!search_try_next(req)) {
-				/* a new request was issued so this request is finished and */
-				/* the user callback will be made when that request (or a */
-				/* child of it) finishes. */
-				request_finished(req, &req_head);
-				return;
-			}
-		}
-
-		/* all else failed. Pass the failure up */
-		reply_callback(req, 0, error, NULL);
-		request_finished(req, &req_head);
-	} else {
-		/* all ok, tell the user */
-		reply_callback(req, ttl, 0, reply);
-		nameserver_up(req->ns);
-		request_finished(req, &req_head);
-	}
-}
-
-static int
-name_parse(u8 *packet, int length, int *idx, char *name_out, int name_out_len) {
-	int name_end = -1;
-	int j = *idx;
-	int ptr_count = 0;
-#define GET32(x) do { if (j + 4 > length) goto err; memcpy(&_t32, packet + j, 4); j += 4; x = ntohl(_t32); } while(0)
-#define GET16(x) do { if (j + 2 > length) goto err; memcpy(&_t, packet + j, 2); j += 2; x = ntohs(_t); } while(0)
-#define GET8(x) do { if (j >= length) goto err; x = packet[j++]; } while(0)
-
-	char *cp = name_out;
-	const char *const end = name_out + name_out_len;
-
-	/* Normally, names are a series of length prefixed strings terminated */
-	/* with a length of 0 (the lengths are u8's < 63). */
-	/* However, the length can start with a pair of 1 bits and that */
-	/* means that the next 14 bits are a pointer within the current */
-	/* packet. */
-
-	for(;;) {
-		u8 label_len;
-		if (j >= length) return -1;
-		GET8(label_len);
-		if (!label_len) break;
-		if (label_len & 0xc0) {
-			u8 ptr_low;
-			GET8(ptr_low);
-			if (name_end < 0) name_end = j;
-			j = (((int)label_len & 0x3f) << 8) + ptr_low;
-			/* Make sure that the target offset is in-bounds. */
-			if (j < 0 || j >= length) return -1;
-			/* If we've jumped more times than there are characters in the
-			 * message, we must have a loop. */
-			if (++ptr_count > length) return -1;
-			continue;
-		}
-		if (label_len > 63) return -1;
-		if (cp != name_out) {
-			if (cp + 1 >= end) return -1;
-			*cp++ = '.';
-		}
-		if (cp + label_len >= end) return -1;
-		memcpy(cp, packet + j, label_len);
-		cp += label_len;
-		j += label_len;
-	}
-	if (cp >= end) return -1;
-	*cp = '\0';
-	if (name_end < 0)
-		*idx = j;
-	else
-		*idx = name_end;
-	return 0;
- err:
-	return -1;
-}
-
-/* parses a raw request from a nameserver */
-static int
-reply_parse(u8 *packet, int length) {
-	int j = 0;  /* index into packet */
-	u16 _t;  /* used by the macros */
-	u32 _t32;  /* used by the macros */
-	char tmp_name[256]; /* used by the macros */
-
-	u16 trans_id, questions, answers, authority, additional, datalength;
-        u16 flags = 0;
-	u32 ttl, ttl_r = 0xffffffff;
-	struct reply reply;
-	struct request *req = NULL;
-	unsigned int i;
-
-	GET16(trans_id);
-	GET16(flags);
-	GET16(questions);
-	GET16(answers);
-	GET16(authority);
-	GET16(additional);
-	(void) authority; /* suppress "unused variable" warnings. */
-	(void) additional; /* suppress "unused variable" warnings. */
-
-	req = request_find_from_trans_id(trans_id);
-	if (!req) return -1;
-
-	memset(&reply, 0, sizeof(reply));
-
-	/* If it's not an answer, it doesn't correspond to any request. */
-	if (!(flags & 0x8000)) return -1;  /* must be an answer */
-	if (flags & 0x020f) {
-		/* there was an error */
-		goto err;
-	}
-	/* if (!answers) return; */  /* must have an answer of some form */
-
-	/* This macro skips a name in the DNS reply. */
-#define SKIP_NAME \
-	do { tmp_name[0] = '\0';					\
-		if (name_parse(packet, length, &j, tmp_name, sizeof(tmp_name))<0) \
-			goto err;													\
-	} while(0);
-
-	reply.type = req->request_type;
-
-	/* skip over each question in the reply */
-	for (i = 0; i < questions; ++i) {
-		/* the question looks like
-		 *   <label:name><u16:type><u16:class>
-		 */
-		SKIP_NAME;
-		j += 4;
-		if (j >= length) goto err;
-	}
-
-	/* now we have the answer section which looks like
-	 * <label:name><u16:type><u16:class><u32:ttl><u16:len><data...>
-	 */
-
-	for (i = 0; i < answers; ++i) {
-		u16 type, class;
-
-		SKIP_NAME;
-		GET16(type);
-		GET16(class);
-		GET32(ttl);
-		GET16(datalength);
-
-		if (type == TYPE_A && class == CLASS_INET) {
-			int addrcount, addrtocopy;
-			if (req->request_type != TYPE_A) {
-				j += datalength; continue;
-			}
-			if ((datalength & 3) != 0) /* not an even number of As. */
-			    goto err;
-			addrcount = datalength >> 2;
-			addrtocopy = MIN(MAX_ADDRS - reply.data.a.addrcount, (unsigned)addrcount);
-
-			ttl_r = MIN(ttl_r, ttl);
-			/* we only bother with the first four addresses. */
-			if (j + 4*addrtocopy > length) goto err;
-			memcpy(&reply.data.a.addresses[reply.data.a.addrcount],
-				   packet + j, 4*addrtocopy);
-			j += 4*addrtocopy;
-			reply.data.a.addrcount += addrtocopy;
-			reply.have_answer = 1;
-			if (reply.data.a.addrcount == MAX_ADDRS) break;
-		} else if (type == TYPE_PTR && class == CLASS_INET) {
-			if (req->request_type != TYPE_PTR) {
-				j += datalength; continue;
-			}
-			if (name_parse(packet, length, &j, reply.data.ptr.name,
-						   sizeof(reply.data.ptr.name))<0)
-				goto err;
-			ttl_r = MIN(ttl_r, ttl);
-			reply.have_answer = 1;
-			break;
-		} else if (type == TYPE_AAAA && class == CLASS_INET) {
-			int addrcount, addrtocopy;
-			if (req->request_type != TYPE_AAAA) {
-				j += datalength; continue;
-			}
-			if ((datalength & 15) != 0) /* not an even number of AAAAs. */
-				goto err;
-			addrcount = datalength >> 4;  /* each address is 16 bytes long */
-			addrtocopy = MIN(MAX_ADDRS - reply.data.aaaa.addrcount, (unsigned)addrcount);
-			ttl_r = MIN(ttl_r, ttl);
-
-			/* we only bother with the first four addresses. */
-			if (j + 16*addrtocopy > length) goto err;
-			memcpy(&reply.data.aaaa.addresses[reply.data.aaaa.addrcount],
-				   packet + j, 16*addrtocopy);
-			reply.data.aaaa.addrcount += addrtocopy;
-			j += 16*addrtocopy;
-			reply.have_answer = 1;
-			if (reply.data.aaaa.addrcount == MAX_ADDRS) break;
-		} else {
-			/* skip over any other type of resource */
-			j += datalength;
-		}
-	}
-
-	reply_handle(req, flags, ttl_r, &reply);
-	return 0;
- err:
-	if (req)
-		reply_handle(req, flags, 0, NULL);
-	return -1;
-}
-
-/* Parse a raw request (packet,length) sent to a nameserver port (port) from */
-/* a DNS client (addr,addrlen), and if it's well-formed, call the corresponding */
-/* callback. */
-static int
-request_parse(u8 *packet, int length, struct evdns_server_port *port, struct sockaddr *addr, socklen_t addrlen)
-{
-	int j = 0;	/* index into packet */
-	u16 _t;	 /* used by the macros */
-	char tmp_name[256]; /* used by the macros */
-
-	int i;
-	u16 trans_id, flags, questions, answers, authority, additional;
-	struct server_request *server_req = NULL;
-
-	/* Get the header fields */
-	GET16(trans_id);
-	GET16(flags);
-	GET16(questions);
-	GET16(answers);
-	GET16(authority);
-	GET16(additional);
-
-	if (flags & 0x8000) return -1; /* Must not be an answer. */
-	if (flags & 0x7800) return -1; /* only standard queries are supported */
-	flags &= 0x0300; /* Only TC and RD get preserved. */
-
-	server_req = malloc(sizeof(struct server_request));
-	if (server_req == NULL) return -1;
-	memset(server_req, 0, sizeof(struct server_request));
-
-	server_req->trans_id = trans_id;
-	memcpy(&server_req->addr, addr, addrlen);
-	server_req->addrlen = addrlen;
-
-	server_req->base.flags = flags;
-	server_req->base.nquestions = 0;
-	server_req->base.questions = malloc(sizeof(struct evdns_server_question *) * questions);
-	if (server_req->base.questions == NULL)
-		goto err;
-
-	for (i = 0; i < questions; ++i) {
-		u16 type, class;
-		struct evdns_server_question *q;
-		int namelen;
-		if (name_parse(packet, length, &j, tmp_name, sizeof(tmp_name))<0)
-			goto err;
-		GET16(type);
-		GET16(class);
-		namelen = strlen(tmp_name);
-		q = malloc(sizeof(struct evdns_server_question) + namelen);
-		if (!q)
-			goto err;
-		q->type = type;
-		q->class = class;
-		memcpy(q->name, tmp_name, namelen+1);
-		server_req->base.questions[server_req->base.nquestions++] = q;
-	}
-
-	/* Ignore answers, authority, and additional. */
-
-	server_req->port = port;
-	port->refcnt++;
-	port->user_callback(&(server_req->base), port->user_data);
-
-	return 0;
-err:
-	if (server_req) {
-		if (server_req->base.questions) {
-			for (i = 0; i < server_req->base.nquestions; ++i)
-				free(server_req->base.questions[i]);
-			free(server_req->base.questions);
-		}
-		free(server_req);
-	}
-	return -1;
-
-#undef SKIP_NAME
-#undef GET32
-#undef GET16
-#undef GET8
-}
-
-/* Try to choose a strong transaction id which isn't already in flight */
-static u16
-transaction_id_pick(void) {
-	for (;;) {
-		const struct request *req = req_head, *started_at;
-#ifdef DNS_USE_CPU_CLOCK_FOR_ID
-		struct timespec ts;
-		u16 trans_id;
-#ifdef CLOCK_MONOTONIC
-		if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
-#else
-		if (clock_gettime(CLOCK_REALTIME, &ts) == -1)
-#endif
-			event_err(1, "clock_gettime");
-                trans_id = ts.tv_nsec & 0xffff;
-#endif
-
-#ifdef DNS_USE_GETTIMEOFDAY_FOR_ID
-		struct timeval tv;
-		u16 trans_id;
-		gettimeofday(&tv, NULL);
-                trans_id = tv.tv_usec & 0xffff;
-#endif
-
-#ifdef DNS_USE_OPENSSL_FOR_ID
-		u16 trans_id;
-		if (RAND_pseudo_bytes((u8 *) &trans_id, 2) == -1) {
-			/* in the case that the RAND call fails we back */
-			/* down to using gettimeofday. */
-			struct timeval tv;
-			gettimeofday(&tv, NULL);
-			trans_id = tv.tv_usec & 0xffff; */
-			abort();
-		}
-#endif
-
-		if (trans_id == 0xffff) continue;
-		/* now check to see if that id is already inflight */
-		req = started_at = req_head;
-		if (req) {
-			do {
-				if (req->trans_id == trans_id) break;
-				req = req->next;
-			} while (req != started_at);
-		}
-		/* we didn't find it, so this is a good id */
-		if (req == started_at) return trans_id;
-	}
-}
-
-/* choose a namesever to use. This function will try to ignore */
-/* nameservers which we think are down and load balance across the rest */
-/* by updating the server_head global each time. */
-static struct nameserver *
-nameserver_pick(void) {
-	struct nameserver *started_at = server_head, *picked;
-	if (!server_head) return NULL;
-
-	/* if we don't have any good nameservers then there's no */
-	/* point in trying to find one. */
-	if (!global_good_nameservers) {
-		server_head = server_head->next;
-		return server_head;
-	}
-
-	/* remember that nameservers are in a circular list */
-	for (;;) {
-		if (server_head->state) {
-			/* we think this server is currently good */
-			picked = server_head;
-			server_head = server_head->next;
-			return picked;
-		}
-
-		server_head = server_head->next;
-		if (server_head == started_at) {
-			/* all the nameservers seem to be down */
-			/* so we just return this one and hope for the */
-			/* best */
-			assert(global_good_nameservers == 0);
-			picked = server_head;
-			server_head = server_head->next;
-			return picked;
-		}
-	}
-}
-
-/* this is called when a namesever socket is ready for reading */
-static void
-nameserver_read(struct nameserver *ns) {
-	u8 packet[1500];
-
-	for (;;) {
-          	const int r = recv(ns->socket, packet, sizeof(packet), 0);
-		if (r < 0) {
-			int err = last_error(ns->socket);
-			if (error_is_eagain(err)) return;
-			nameserver_failed(ns, strerror(err));
-			return;
-		}
-		ns->timedout = 0;
-		reply_parse(packet, r);
-	}
-}
-
-/* Read a packet from a DNS client on a server port s, parse it, and */
-/* act accordingly. */
-static void
-server_port_read(struct evdns_server_port *s) {
-	u8 packet[1500];
-	struct sockaddr_storage addr;
-	socklen_t addrlen;
-	int r;
-
-	for (;;) {
-		addrlen = sizeof(struct sockaddr_storage);
-		r = recvfrom(s->socket, packet, sizeof(packet), 0,
-					 (struct sockaddr*) &addr, &addrlen);
-		if (r < 0) {
-			int err = last_error(s->socket);
-			if (error_is_eagain(err)) return;
-			log(EVDNS_LOG_WARN, "Error %s (%d) while reading request.",
-				strerror(err), err);
-			return;
-		}
-		request_parse(packet, r, s, (struct sockaddr*) &addr, addrlen);
-	}
-}
-
-/* Try to write all pending replies on a given DNS server port. */
-static void
-server_port_flush(struct evdns_server_port *port)
-{
-	while (port->pending_replies) {
-		struct server_request *req = port->pending_replies;
-		int r = sendto(port->socket, req->response, req->response_len, 0,
-			   (struct sockaddr*) &req->addr, req->addrlen);
-		if (r < 0) {
-			int err = last_error(port->socket);
-			if (error_is_eagain(err))
-				return;
-			log(EVDNS_LOG_WARN, "Error %s (%d) while writing response to port; dropping", strerror(err), err);
-		}
-		if (server_request_free(req)) {
-			/* we released the last reference to req->port. */
-			return;
-		}
-	}
-
-	/* We have no more pending requests; stop listening for 'writeable' events. */
-	(void) event_del(&port->event);
-	event_set(&port->event, port->socket, EV_READ | EV_PERSIST,
-			  server_port_ready_callback, port);
-	if (event_add(&port->event, NULL) < 0) {
-		log(EVDNS_LOG_WARN, "Error from libevent when adding event for DNS server.");
-		/* ???? Do more? */
-	}
-}
-
-/* set if we are waiting for the ability to write to this server. */
-/* if waiting is true then we ask libevent for EV_WRITE events, otherwise */
-/* we stop these events. */
-static void
-nameserver_write_waiting(struct nameserver *ns, char waiting) {
-	if (ns->write_waiting == waiting) return;
-
-	ns->write_waiting = waiting;
-	(void) event_del(&ns->event);
-	event_set(&ns->event, ns->socket, EV_READ | (waiting ? EV_WRITE : 0) | EV_PERSIST,
-			nameserver_ready_callback, ns);
-	if (event_add(&ns->event, NULL) < 0) {
-          log(EVDNS_LOG_WARN, "Error from libevent when adding event for %s",
-              debug_ntoa(ns->address));
-          /* ???? Do more? */
-        }
-}
-
-/* a callback function. Called by libevent when the kernel says that */
-/* a nameserver socket is ready for writing or reading */
-static void
-nameserver_ready_callback(int fd, short events, void *arg) {
-	struct nameserver *ns = (struct nameserver *) arg;
-        (void)fd;
-
-	if (events & EV_WRITE) {
-		ns->choked = 0;
-		if (!evdns_transmit()) {
-			nameserver_write_waiting(ns, 0);
-		}
-	}
-	if (events & EV_READ) {
-		nameserver_read(ns);
-	}
-}
-
-/* a callback function. Called by libevent when the kernel says that */
-/* a server socket is ready for writing or reading. */
-static void
-server_port_ready_callback(int fd, short events, void *arg) {
-	struct evdns_server_port *port = (struct evdns_server_port *) arg;
-	(void) fd;
-
-	if (events & EV_WRITE) {
-		port->choked = 0;
-		server_port_flush(port);
-	}
-	if (events & EV_READ) {
-		server_port_read(port);
-	}
-}
-
-/* This is an inefficient representation; only use it via the dnslabel_table_*
- * functions, so that is can be safely replaced with something smarter later. */
-#define MAX_LABELS 128
-/* Structures used to implement name compression */
-struct dnslabel_entry { char *v; off_t pos; };
-struct dnslabel_table {
-	int n_labels; /* number of current entries */
-	/* map from name to position in message */
-	struct dnslabel_entry labels[MAX_LABELS];
-};
-
-/* Initialize dnslabel_table. */
-static void
-dnslabel_table_init(struct dnslabel_table *table)
-{
-	table->n_labels = 0;
-}
-
-/* Free all storage held by table, but not the table itself. */
-static void
-dnslabel_clear(struct dnslabel_table *table)
-{
-	int i;
-	for (i = 0; i < table->n_labels; ++i)
-		free(table->labels[i].v);
-	table->n_labels = 0;
-}
-
-/* return the position of the label in the current message, or -1 if the label */
-/* hasn't been used yet. */
-static int
-dnslabel_table_get_pos(const struct dnslabel_table *table, const char *label)
-{
-	int i;
-	for (i = 0; i < table->n_labels; ++i) {
-		if (!strcmp(label, table->labels[i].v))
-			return table->labels[i].pos;
-	}
-	return -1;
-}
-
-/* remember that we've used the label at position pos */
-static int
-dnslabel_table_add(struct dnslabel_table *table, const char *label, off_t pos)
-{
-	char *v;
-	int p;
-	if (table->n_labels == MAX_LABELS)
-		return (-1);
-	v = strdup(label);
-	if (v == NULL)
-		return (-1);
-	p = table->n_labels++;
-	table->labels[p].v = v;
-	table->labels[p].pos = pos;
-
-	return (0);
-}
-
-/* Converts a string to a length-prefixed set of DNS labels, starting */
-/* at buf[j]. name and buf must not overlap. name_len should be the length */
-/* of name.	 table is optional, and is used for compression. */
-/* */
-/* Input: abc.def */
-/* Output: <3>abc<3>def<0> */
-/* */
-/* Returns the first index after the encoded name, or negative on error. */
-/*	 -1	 label was > 63 bytes */
-/*	 -2	 name too long to fit in buffer. */
-/* */
-static off_t
-dnsname_to_labels(u8 *const buf, size_t buf_len, off_t j,
-				  const char *name, const int name_len,
-				  struct dnslabel_table *table) {
-	const char *end = name + name_len;
-	int ref = 0;
-	u16 _t;
-
-#define APPEND16(x) do {						   \
-		if (j + 2 > (off_t)buf_len)				   \
-			goto overflow;						   \
-		_t = htons(x);							   \
-		memcpy(buf + j, &_t, 2);				   \
-		j += 2;									   \
-	} while (0)
-#define APPEND32(x) do {						   \
-		if (j + 4 > (off_t)buf_len)				   \
-			goto overflow;						   \
-		_t32 = htonl(x);						   \
-		memcpy(buf + j, &_t32, 4);				   \
-		j += 4;									   \
-	} while (0)
-
-	if (name_len > 255) return -2;
-
-	for (;;) {
-		const char *const start = name;
-		if (table && (ref = dnslabel_table_get_pos(table, name)) >= 0) {
-			APPEND16(ref | 0xc000);
-			return j;
-		}
-		name = strchr(name, '.');
-		if (!name) {
-			const unsigned int label_len = end - start;
-			if (label_len > 63) return -1;
-			if ((size_t)(j+label_len+1) > buf_len) return -2;
-			if (table) dnslabel_table_add(table, start, j);
-			buf[j++] = label_len;
-
-			memcpy(buf + j, start, end - start);
-			j += end - start;
-			break;
-		} else {
-			/* append length of the label. */
-			const unsigned int label_len = name - start;
-			if (label_len > 63) return -1;
-			if ((size_t)(j+label_len+1) > buf_len) return -2;
-			if (table) dnslabel_table_add(table, start, j);
-			buf[j++] = label_len;
-
-			memcpy(buf + j, start, name - start);
-			j += name - start;
-			/* hop over the '.' */
-			name++;
-		}
-	}
-
-	/* the labels must be terminated by a 0. */
-	/* It's possible that the name ended in a . */
-	/* in which case the zero is already there */
-	if (!j || buf[j-1]) buf[j++] = 0;
-	return j;
- overflow:
-	return (-2);
-}
-
-/* Finds the length of a dns request for a DNS name of the given */
-/* length. The actual request may be smaller than the value returned */
-/* here */
-static int
-evdns_request_len(const int name_len) {
-	return 96 + /* length of the DNS standard header */
-		name_len + 2 +
-		4;  /* space for the resource type */
-}
-
-/* build a dns request packet into buf. buf should be at least as long */
-/* as evdns_request_len told you it should be. */
-/* */
-/* Returns the amount of space used. Negative on error. */
-static int
-evdns_request_data_build(const char *const name, const int name_len,
-    const u16 trans_id, const u16 type, const u16 class,
-    u8 *const buf, size_t buf_len) {
-	off_t j = 0;  /* current offset into buf */
-	u16 _t;  /* used by the macros */
-
-	APPEND16(trans_id);
-	APPEND16(0x0100);  /* standard query, recusion needed */
-	APPEND16(1);  /* one question */
-	APPEND16(0);  /* no answers */
-	APPEND16(0);  /* no authority */
-	APPEND16(0);  /* no additional */
-
-	j = dnsname_to_labels(buf, buf_len, j, name, name_len, NULL);
-	if (j < 0) {
-		return (int)j;
-	}
-	
-	APPEND16(type);
-	APPEND16(class);
-
-	return (int)j;
- overflow:
-	return (-1);
-}
-
-/* exported function */
-struct evdns_server_port *
-evdns_add_server_port(int socket, int is_tcp, evdns_request_callback_fn_type cb, void *user_data)
-{
-	struct evdns_server_port *port;
-	if (!(port = malloc(sizeof(struct evdns_server_port))))
-		return NULL;
-	memset(port, 0, sizeof(struct evdns_server_port));
-
-	assert(!is_tcp); /* TCP sockets not yet implemented */
-	port->socket = socket;
-	port->refcnt = 1;
-	port->choked = 0;
-	port->closing = 0;
-	port->user_callback = cb;
-	port->user_data = user_data;
-	port->pending_replies = NULL;
-
-	event_set(&port->event, port->socket, EV_READ | EV_PERSIST,
-			  server_port_ready_callback, port);
-	event_add(&port->event, NULL); /* check return. */
-	return port;
-}
-
-/* exported function */
-void
-evdns_close_server_port(struct evdns_server_port *port)
-{
-	if (--port->refcnt == 0)
-		server_port_free(port);
-	port->closing = 1;
-}
-
-/* exported function */
-int
-evdns_server_request_add_reply(struct evdns_server_request *_req, int section, const char *name, int type, int class, int ttl, int datalen, int is_name, const char *data)
-{
-	struct server_request *req = TO_SERVER_REQUEST(_req);
-	struct server_reply_item **itemp, *item;
-	int *countp;
-
-	if (req->response) /* have we already answered? */
-		return (-1);
-
-	switch (section) {
-	case EVDNS_ANSWER_SECTION:
-		itemp = &req->answer;
-		countp = &req->n_answer;
-		break;
-	case EVDNS_AUTHORITY_SECTION:
-		itemp = &req->authority;
-		countp = &req->n_authority;
-		break;
-	case EVDNS_ADDITIONAL_SECTION:
-		itemp = &req->additional;
-		countp = &req->n_additional;
-		break;
-	default:
-		return (-1);
-	}
-	while (*itemp) {
-		itemp = &((*itemp)->next);
-	}
-	item = malloc(sizeof(struct server_reply_item));
-	if (!item)
-		return -1;
-	item->next = NULL;
-	if (!(item->name = strdup(name))) {
-		free(item);
-		return -1;
-	}
-	item->type = type;
-	item->class = class;
-	item->ttl = ttl;
-	item->is_name = is_name != 0;
-	item->datalen = 0;
-	item->data = NULL;
-	if (data) {
-		if (item->is_name) {
-			if (!(item->data = strdup(data))) {
-				free(item->name);
-				free(item);
-				return -1;
-			}
-			item->datalen = (u16)-1;
-		} else {
-			if (!(item->data = malloc(datalen))) {
-				free(item->name);
-				free(item);
-				return -1;
-			}
-			item->datalen = datalen;
-			memcpy(item->data, data, datalen);
-		}
-	}
-
-	*itemp = item;
-	++(*countp);
-	return 0;
-}
-
-/* exported function */
-int
-evdns_server_request_add_a_reply(struct evdns_server_request *req, const char *name, int n, void *addrs, int ttl)
-{
-	return evdns_server_request_add_reply(
-		  req, EVDNS_ANSWER_SECTION, name, TYPE_A, CLASS_INET,
-		  ttl, n*4, 0, addrs);
-}
-
-/* exported function */
-int
-evdns_server_request_add_aaaa_reply(struct evdns_server_request *req, const char *name, int n, void *addrs, int ttl)
-{
-	return evdns_server_request_add_reply(
-		  req, EVDNS_ANSWER_SECTION, name, TYPE_AAAA, CLASS_INET,
-		  ttl, n*16, 0, addrs);
-}
-
-/* exported function */
-int
-evdns_server_request_add_ptr_reply(struct evdns_server_request *req, struct in_addr *in, const char *inaddr_name, const char *hostname, int ttl)
-{
-	u32 a;
-	char buf[32];
-	assert(in || inaddr_name);
-	assert(!(in && inaddr_name));
-	if (in) {
-		a = ntohl(in->s_addr);
-		snprintf(buf, sizeof(buf), "%d.%d.%d.%d.in-addr.arpa",
-				(int)(u8)((a	)&0xff),
-				(int)(u8)((a>>8 )&0xff),
-				(int)(u8)((a>>16)&0xff),
-				(int)(u8)((a>>24)&0xff));
-		inaddr_name = buf;
-	}
-	return evdns_server_request_add_reply(
-		  req, EVDNS_ANSWER_SECTION, inaddr_name, TYPE_PTR, CLASS_INET,
-		  ttl, -1, 1, hostname);
-}
-
-/* exported function */
-int
-evdns_server_request_add_cname_reply(struct evdns_server_request *req, const char *name, const char *cname, int ttl)
-{
-	return evdns_server_request_add_reply(
-		  req, EVDNS_ANSWER_SECTION, name, TYPE_A, CLASS_INET,
-		  ttl, -1, 1, cname);
-}
-
-
-static int
-evdns_server_request_format_response(struct server_request *req, int err)
-{
-	unsigned char buf[1500];
-	size_t buf_len = sizeof(buf);
-	off_t j = 0, r;
-	u16 _t;
-	u32 _t32;
-	int i;
-	u16 flags;
-	struct dnslabel_table table;
-
-	if (err < 0 || err > 15) return -1;
-
-	/* Set response bit and error code; copy OPCODE and RD fields from
-	 * question; copy RA and AA if set by caller. */
-	flags = req->base.flags;
-	flags |= (0x8000 | err);
-
-	dnslabel_table_init(&table);
-	APPEND16(req->trans_id);
-	APPEND16(flags);
-	APPEND16(req->base.nquestions);
-	APPEND16(req->n_answer);
-	APPEND16(req->n_authority);
-	APPEND16(req->n_additional);
-
-	/* Add questions. */
-	for (i=0; i < req->base.nquestions; ++i) {
-		const char *s = req->base.questions[i]->name;
-		j = dnsname_to_labels(buf, buf_len, j, s, strlen(s), &table);
-		if (j < 0) {
-			dnslabel_clear(&table);
-			return (int) j;
-		}
-		APPEND16(req->base.questions[i]->type);
-		APPEND16(req->base.questions[i]->class);
-	}
-
-	/* Add answer, authority, and additional sections. */
-	for (i=0; i<3; ++i) {
-		struct server_reply_item *item;
-		if (i==0)
-			item = req->answer;
-		else if (i==1)
-			item = req->authority;
-		else
-			item = req->additional;
-		while (item) {
-			r = dnsname_to_labels(buf, buf_len, j, item->name, strlen(item->name), &table);
-			if (r < 0)
-				goto overflow;
-			j = r;
-
-			APPEND16(item->type);
-			APPEND16(item->class);
-			APPEND32(item->ttl);
-			if (item->is_name) {
-				off_t len_idx = j, name_start;
-				j += 2;
-				name_start = j;
-				r = dnsname_to_labels(buf, buf_len, j, item->data, strlen(item->data), &table);
-				if (r < 0)
-					goto overflow;
-				j = r;
-				_t = htons( (j-name_start) );
-				memcpy(buf+len_idx, &_t, 2);
-			} else {
-				APPEND16(item->datalen);
-				if (j+item->datalen > (off_t)buf_len)
-					goto overflow;
-				memcpy(buf+j, item->data, item->datalen);
-				j += item->datalen;
-			}
-			item = item->next;
-		}
-	}
-
-	if (j > 512) {
-overflow:
-		j = 512;
-		buf[3] |= 0x02; /* set the truncated bit. */
-	}
-
-	req->response_len = j;
-
-	if (!(req->response = malloc(req->response_len))) {
-		server_request_free_answers(req);
-		dnslabel_clear(&table);
-		return (-1);
-	}
-	memcpy(req->response, buf, req->response_len);
-	server_request_free_answers(req);
-	dnslabel_clear(&table);
-	return (0);
-}
-
-/* exported function */
-int
-evdns_server_request_respond(struct evdns_server_request *_req, int err)
-{
-	struct server_request *req = TO_SERVER_REQUEST(_req);
-	struct evdns_server_port *port = req->port;
-	int r;
-	if (!req->response) {
-		if ((r = evdns_server_request_format_response(req, err))<0)
-			return r;
-	}
-
-	r = sendto(port->socket, req->response, req->response_len, 0,
-			   (struct sockaddr*) &req->addr, req->addrlen);
-	if (r<0) {
-		int err = last_error(port->socket);
-		if (! error_is_eagain(err))
-			return -1;
-
-		if (port->pending_replies) {
-			req->prev_pending = port->pending_replies->prev_pending;
-			req->next_pending = port->pending_replies;
-			req->prev_pending->next_pending =
-				req->next_pending->prev_pending = req;
-		} else {
-			req->prev_pending = req->next_pending = req;
-			port->pending_replies = req;
-			port->choked = 1;
-
-			(void) event_del(&port->event);
-			event_set(&port->event, port->socket, (port->closing?0:EV_READ) | EV_WRITE | EV_PERSIST, server_port_ready_callback, port);
-
-			if (event_add(&port->event, NULL) < 0) {
-				log(EVDNS_LOG_WARN, "Error from libevent when adding event for DNS server");
-			}
-
-		}
-
-		return 1;
-	}
-	if (server_request_free(req))
-		return 0;
-
-	if (port->pending_replies)
-		server_port_flush(port);
-
-	return 0;
-}
-
-/* Free all storage held by RRs in req. */
-static void
-server_request_free_answers(struct server_request *req)
-{
-	struct server_reply_item *victim, *next, **list;
-	int i;
-	for (i = 0; i < 3; ++i) {
-		if (i==0)
-			list = &req->answer;
-		else if (i==1)
-			list = &req->authority;
-		else
-			list = &req->additional;
-
-		victim = *list;
-		while (victim) {
-			next = victim->next;
-			free(victim->name);
-			if (victim->data)
-				free(victim->data);
-			free(victim);
-			victim = next;
-		}
-		*list = NULL;
-	}
-}
-
-/* Free all storage held by req, and remove links to it. */
-/* return true iff we just wound up freeing the server_port. */
-static int
-server_request_free(struct server_request *req)
-{
-	int i, rc=1;
-	if (req->base.questions) {
-		for (i = 0; i < req->base.nquestions; ++i)
-			free(req->base.questions[i]);
-		free(req->base.questions);
-	}
-
-	if (req->port) {
-		if (req->port->pending_replies == req) {
-			if (req->next_pending)
-				req->port->pending_replies = req->next_pending;
-			else
-				req->port->pending_replies = NULL;
-		}
-		rc = --req->port->refcnt;
-	}
-
-	if (req->response) {
-		free(req->response);
-	}
-
-	server_request_free_answers(req);
-
-	if (req->next_pending && req->next_pending != req) {
-		req->next_pending->prev_pending = req->prev_pending;
-		req->prev_pending->next_pending = req->next_pending;
-	}
-
-	if (rc == 0) {
-		server_port_free(req->port);
-		free(req);
-		return (1);
-	}
-	free(req);
-	return (0);
-}
-
-/* Free all storage held by an evdns_server_port.  Only called when  */
-static void
-server_port_free(struct evdns_server_port *port)
-{
-	assert(port);
-	assert(!port->refcnt);
-	assert(!port->pending_replies);
-	if (port->socket > 0) {
-		CLOSE_SOCKET(port->socket);
-		port->socket = -1;
-	}
-	(void) event_del(&port->event);
-	/* XXXX actually free the port? -NM */
-}
-
-/* exported function */
-int
-evdns_server_request_drop(struct evdns_server_request *_req)
-{
-	struct server_request *req = TO_SERVER_REQUEST(_req);
-	server_request_free(req);
-	return 0;
-}
-
-/* exported function */
-int
-evdns_server_request_get_requesting_addr(struct evdns_server_request *_req, struct sockaddr *sa, int addr_len)
-{
-	struct server_request *req = TO_SERVER_REQUEST(_req);
-	if (addr_len < (int)req->addrlen)
-		return -1;
-	memcpy(sa, &(req->addr), req->addrlen);
-	return req->addrlen;
-}
-
-#undef APPEND16
-#undef APPEND32
-
-/* this is a libevent callback function which is called when a request */
-/* has timed out. */
-static void
-evdns_request_timeout_callback(int fd, short events, void *arg) {
-	struct request *const req = (struct request *) arg;
-        (void) fd;
-        (void) events;
-
-	log(EVDNS_LOG_DEBUG, "Request %lx timed out", (unsigned long) arg);
-
-	req->ns->timedout++;
-	if (req->ns->timedout > global_max_nameserver_timeout) {
-		req->ns->timedout = 0;
-		nameserver_failed(req->ns, "request timed out.");
-	}
-
-	(void) evtimer_del(&req->timeout_event);
-	if (req->tx_count >= global_max_retransmits) {
-		/* this request has failed */
-		reply_callback(req, 0, DNS_ERR_TIMEOUT, NULL);
-		request_finished(req, &req_head);
-	} else {
-		/* retransmit it */
-		evdns_request_transmit(req);
-	}
-}
-
-/* try to send a request to a given server. */
-/* */
-/* return: */
-/*   0 ok */
-/*   1 temporary failure */
-/*   2 other failure */
-static int
-evdns_request_transmit_to(struct request *req, struct nameserver *server) {
-	const int r = send(server->socket, req->request, req->request_len, 0);
-	if (r < 0) {
-		int err = last_error(server->socket);
-		if (error_is_eagain(err)) return 1;
-		nameserver_failed(req->ns, strerror(err));
-		return 2;
-	} else if (r != (int)req->request_len) {
-		return 1;  /* short write */
-	} else {
-		return 0;
-	}
-}
-
-/* try to send a request, updating the fields of the request */
-/* as needed */
-/* */
-/* return: */
-/*   0 ok */
-/*   1 failed */
-static int
-evdns_request_transmit(struct request *req) {
-	int retcode = 0, r;
-
-	/* if we fail to send this packet then this flag marks it */
-	/* for evdns_transmit */
-	req->transmit_me = 1;
-	if (req->trans_id == 0xffff) abort();
-
-	if (req->ns->choked) {
-		/* don't bother trying to write to a socket */
-		/* which we have had EAGAIN from */
-		return 1;
-	}
-
-	r = evdns_request_transmit_to(req, req->ns);
-	switch (r) {
-	case 1:
-		/* temp failure */
-		req->ns->choked = 1;
-		nameserver_write_waiting(req->ns, 1);
-		return 1;
-	case 2:
-		/* failed in some other way */
-		retcode = 1;
-		/* fall through */
-	default:
-		/* all ok */
-		log(EVDNS_LOG_DEBUG,
-		    "Setting timeout for request %lx", (unsigned long) req);
-		evtimer_set(&req->timeout_event, evdns_request_timeout_callback, req);
-		if (evtimer_add(&req->timeout_event, &global_timeout) < 0) {
-                  log(EVDNS_LOG_WARN,
-		      "Error from libevent when adding timer for request %lx",
-                      (unsigned long) req);
-                  /* ???? Do more? */
-                }
-		req->tx_count++;
-		req->transmit_me = 0;
-		return retcode;
-	}
-}
-
-static void
-nameserver_probe_callback(int result, char type, int count, int ttl, void *addresses, void *arg) {
-	struct nameserver *const ns = (struct nameserver *) arg;
-        (void) type;
-        (void) count;
-        (void) ttl;
-        (void) addresses;
-
-	if (result == DNS_ERR_NONE || result == DNS_ERR_NOTEXIST) {
-		/* this is a good reply */
-		nameserver_up(ns);
-	} else nameserver_probe_failed(ns);
-}
-
-static void
-nameserver_send_probe(struct nameserver *const ns) {
-	struct request *req;
-	/* here we need to send a probe to a given nameserver */
-	/* in the hope that it is up now. */
-
-  	log(EVDNS_LOG_DEBUG, "Sending probe to %s", debug_ntoa(ns->address));
-
-	req = request_new(TYPE_A, "www.google.com", DNS_QUERY_NO_SEARCH, nameserver_probe_callback, ns);
-        if (!req) return;
-	/* we force this into the inflight queue no matter what */
-	request_trans_id_set(req, transaction_id_pick());
-	req->ns = ns;
-	request_submit(req);
-}
-
-/* returns: */
-/*   0 didn't try to transmit anything */
-/*   1 tried to transmit something */
-static int
-evdns_transmit(void) {
-	char did_try_to_transmit = 0;
-
-	if (req_head) {
-		struct request *const started_at = req_head, *req = req_head;
-		/* first transmit all the requests which are currently waiting */
-		do {
-			if (req->transmit_me) {
-				did_try_to_transmit = 1;
-				evdns_request_transmit(req);
-			}
-
-			req = req->next;
-		} while (req != started_at);
-	}
-
-	return did_try_to_transmit;
-}
-
-/* exported function */
-int
-evdns_count_nameservers(void)
-{
-	const struct nameserver *server = server_head;
-	int n = 0;
-	if (!server)
-		return 0;
-	do {
-		++n;
-		server = server->next;
-	} while (server != server_head);
-	return n;
-}
-
-/* exported function */
-int
-evdns_clear_nameservers_and_suspend(void)
-{
-	struct nameserver *server = server_head, *started_at = server_head;
-	struct request *req = req_head, *req_started_at = req_head;
-
-	if (!server)
-		return 0;
-	while (1) {
-		struct nameserver *next = server->next;
-		(void) event_del(&server->event);
-		(void) evtimer_del(&server->timeout_event);
-		if (server->socket >= 0)
-			CLOSE_SOCKET(server->socket);
-		free(server);
-		if (next == started_at)
-			break;
-		server = next;
-	}
-	server_head = NULL;
-	global_good_nameservers = 0;
-
-	while (req) {
-		struct request *next = req->next;
-		req->tx_count = req->reissue_count = 0;
-		req->ns = NULL;
-		/* ???? What to do about searches? */
-		(void) evtimer_del(&req->timeout_event);
-		req->trans_id = 0;
-		req->transmit_me = 0;
-
-		global_requests_waiting++;
-		evdns_request_insert(req, &req_waiting_head);
-		/* We want to insert these suspended elements at the front of
-		 * the waiting queue, since they were pending before any of
-		 * the waiting entries were added.  This is a circular list,
-		 * so we can just shift the start back by one.*/
-		req_waiting_head = req_waiting_head->prev;
-
-		if (next == req_started_at)
-			break;
-		req = next;
-	}
-	req_head = NULL;
-	global_requests_inflight = 0;
-
-	return 0;
-}
-
-
-/* exported function */
-int
-evdns_resume(void)
-{
-	evdns_requests_pump_waiting_queue();
-	return 0;
-}
-
-static int
-_evdns_nameserver_add_impl(unsigned long int address, int port) {
-	/* first check to see if we already have this nameserver */
-
-	const struct nameserver *server = server_head, *const started_at = server_head;
-	struct nameserver *ns;
-	struct sockaddr_in sin;
-	int err = 0;
-	if (server) {
-		do {
-			if (server->address == address) return 3;
-			server = server->next;
-		} while (server != started_at);
-	}
-
-	ns = (struct nameserver *) malloc(sizeof(struct nameserver));
-        if (!ns) return -1;
-
-	memset(ns, 0, sizeof(struct nameserver));
-
-	ns->socket = socket(PF_INET, SOCK_DGRAM, 0);
-	if (ns->socket < 0) { err = 1; goto out1; }
-#ifdef WIN32
-        {
-		u_long nonblocking = 1;
-		ioctlsocket(ns->socket, FIONBIO, &nonblocking);
-	}
-#else
-        fcntl(ns->socket, F_SETFL, O_NONBLOCK);
-#endif
-	sin.sin_addr.s_addr = address;
-	sin.sin_port = htons(port);
-	sin.sin_family = AF_INET;
-	if (connect(ns->socket, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
-		err = 2;
-		goto out2;
-	}
-
-	ns->address = address;
-	ns->state = 1;
-	event_set(&ns->event, ns->socket, EV_READ | EV_PERSIST, nameserver_ready_callback, ns);
-	if (event_add(&ns->event, NULL) < 0) {
-          err = 2;
-          goto out2;
-        }
-
-	log(EVDNS_LOG_DEBUG, "Added nameserver %s", debug_ntoa(address));
-
-	/* insert this nameserver into the list of them */
-	if (!server_head) {
-		ns->next = ns->prev = ns;
-		server_head = ns;
-	} else {
-		ns->next = server_head->next;
-		ns->prev = server_head;
-		server_head->next = ns;
-		if (server_head->prev == server_head) {
-			server_head->prev = ns;
-		}
-	}
-
-	global_good_nameservers++;
-
-	return 0;
-
-out2:
-	CLOSE_SOCKET(ns->socket);
-out1:
-	free(ns);
-	log(EVDNS_LOG_WARN, "Unable to add nameserver %s: error %d", debug_ntoa(address), err);
-	return err;
-}
-
-/* exported function */
-int
-evdns_nameserver_add(unsigned long int address) {
-	return _evdns_nameserver_add_impl(address, 53);
-}
-
-/* exported function */
-int
-evdns_nameserver_ip_add(const char *ip_as_string) {
-	struct in_addr ina;
-	int port;
-	char buf[20];
-	const char *cp;
-	cp = strchr(ip_as_string, ':');
-	if (! cp) {
-		cp = ip_as_string;
-		port = 53;
-	} else {
-		port = strtoint(cp+1);
-		if (port < 0 || port > 65535) {
-			return 4;
-		}
-		if ((cp-ip_as_string) >= (int)sizeof(buf)) {
-			return 4;
-		}
-		memcpy(buf, ip_as_string, cp-ip_as_string);
-		buf[cp-ip_as_string] = '\0';
-		cp = buf;
-	}
-	if (!inet_aton(cp, &ina)) {
-		return 4;
-	}
-	return _evdns_nameserver_add_impl(ina.s_addr, port);
-}
-
-/* insert into the tail of the queue */
-static void
-evdns_request_insert(struct request *req, struct request **head) {
-	if (!*head) {
-		*head = req;
-		req->next = req->prev = req;
-		return;
-	}
-
-	req->prev = (*head)->prev;
-	req->prev->next = req;
-	req->next = *head;
-	(*head)->prev = req;
-}
-
-static int
-string_num_dots(const char *s) {
-	int count = 0;
-	while ((s = strchr(s, '.'))) {
-		s++;
-		count++;
-	}
-	return count;
-}
-
-static struct request *
-request_new(int type, const char *name, int flags,
-    evdns_callback_type callback, void *user_ptr) {
-	const char issuing_now =
-	    (global_requests_inflight < global_max_requests_inflight) ? 1 : 0;
-
-	const int name_len = strlen(name);
-	const int request_max_len = evdns_request_len(name_len);
-	const u16 trans_id = issuing_now ? transaction_id_pick() : 0xffff;
-	/* the request data is alloced in a single block with the header */
-	struct request *const req =
-	    (struct request *) malloc(sizeof(struct request) + request_max_len);
-	int rlen;
-        (void) flags;
-
-        if (!req) return NULL;
-	memset(req, 0, sizeof(struct request));
-
-	/* request data lives just after the header */
-	req->request = ((u8 *) req) + sizeof(struct request);
-	/* denotes that the request data shouldn't be free()ed */
-	req->request_appended = 1;
-	rlen = evdns_request_data_build(name, name_len, trans_id,
-	    type, CLASS_INET, req->request, request_max_len);
-	if (rlen < 0)
-		goto err1;
-	req->request_len = rlen;
-	req->trans_id = trans_id;
-	req->tx_count = 0;
-	req->request_type = type;
-	req->user_pointer = user_ptr;
-	req->user_callback = callback;
-	req->ns = issuing_now ? nameserver_pick() : NULL;
-	req->next = req->prev = NULL;
-
-	return req;
-err1:
-	free(req);
-	return NULL;
-}
-
-static void
-request_submit(struct request *const req) {
-	if (req->ns) {
-		/* if it has a nameserver assigned then this is going */
-		/* straight into the inflight queue */
-		evdns_request_insert(req, &req_head);
-		global_requests_inflight++;
-		evdns_request_transmit(req);
-	} else {
-		evdns_request_insert(req, &req_waiting_head);
-		global_requests_waiting++;
-	}
-}
-
-/* exported function */
-int evdns_resolve_ipv4(const char *name, int flags,
-    evdns_callback_type callback, void *ptr) {
-	log(EVDNS_LOG_DEBUG, "Resolve requested for %s", name);
-	if (flags & DNS_QUERY_NO_SEARCH) {
-		struct request *const req =
-			request_new(TYPE_A, name, flags, callback, ptr);
-		if (req == NULL)
-			return (1);
-		request_submit(req);
-		return (0);
-	} else {
-		return (search_request_new(TYPE_A, name, flags, callback, ptr));
-	}
-}
-
-/* exported function */
-int evdns_resolve_ipv6(const char *name, int flags,
-					   evdns_callback_type callback, void *ptr) {
-	log(EVDNS_LOG_DEBUG, "Resolve requested for %s", name);
-	if (flags & DNS_QUERY_NO_SEARCH) {
-		struct request *const req =
-			request_new(TYPE_AAAA, name, flags, callback, ptr);
-		if (req == NULL)
-			return (1);
-		request_submit(req);
-		return (0);
-	} else {
-		return (search_request_new(TYPE_AAAA, name, flags, callback, ptr));
-	}
-}
-
-int evdns_resolve_reverse(struct in_addr *in, int flags, evdns_callback_type callback, void *ptr) {
-	char buf[32];
-	struct request *req;
-	u32 a;
-	assert(in);
-	a = ntohl(in->s_addr);
-	snprintf(buf, sizeof(buf), "%d.%d.%d.%d.in-addr.arpa",
-			(int)(u8)((a	)&0xff),
-			(int)(u8)((a>>8 )&0xff),
-			(int)(u8)((a>>16)&0xff),
-			(int)(u8)((a>>24)&0xff));
-	log(EVDNS_LOG_DEBUG, "Resolve requested for %s (reverse)", buf);
-	req = request_new(TYPE_PTR, buf, flags, callback, ptr);
-	if (!req) return 1;
-	request_submit(req);
-	return 0;
-}
-
-int evdns_resolve_reverse_ipv6(struct in6_addr *in, int flags, evdns_callback_type callback, void *ptr) {
-	char buf[96];
-	char *cp;
-	struct request *req;
-	int i;
-	assert(in);
-	cp = buf;
-	for (i=15; i >= 0; --i) {
-		u8 byte = in->s6_addr[i];
-		*cp++ = "0123456789abcdef"[byte & 0x0f];
-		*cp++ = '.';
-		*cp++ = "0123456789abcdef"[byte >> 4];
-		*cp++ = '.';
-	}
-	assert(cp + strlen(".ip6.arpa") < buf+sizeof(buf));
-	memcpy(cp, ".ip6.arpa", strlen(".ip6.arpa")+1);
-	log(EVDNS_LOG_DEBUG, "Resolve requested for %s (reverse)", buf);
-	req = request_new(TYPE_PTR, buf, flags, callback, ptr);
-	if (!req) return 1;
-	request_submit(req);
-	return 0;
-}
-
-/*/////////////////////////////////////////////////////////////////// */
-/* Search support */
-/* */
-/* the libc resolver has support for searching a number of domains */
-/* to find a name. If nothing else then it takes the single domain */
-/* from the gethostname() call. */
-/* */
-/* It can also be configured via the domain and search options in a */
-/* resolv.conf. */
-/* */
-/* The ndots option controls how many dots it takes for the resolver */
-/* to decide that a name is non-local and so try a raw lookup first. */
-
-struct search_domain {
-	int len;
-	struct search_domain *next;
-	/* the text string is appended to this structure */
-};
-
-struct search_state {
-	int refcount;
-	int ndots;
-	int num_domains;
-	struct search_domain *head;
-};
-
-static struct search_state *global_search_state = NULL;
-
-static void
-search_state_decref(struct search_state *const state) {
-	if (!state) return;
-	state->refcount--;
-	if (!state->refcount) {
-		struct search_domain *next, *dom;
-		for (dom = state->head; dom; dom = next) {
-			next = dom->next;
-			free(dom);
-		}
-		free(state);
-	}
-}
-
-static struct search_state *
-search_state_new(void) {
-	struct search_state *state = (struct search_state *) malloc(sizeof(struct search_state));
-        if (!state) return NULL;
-	memset(state, 0, sizeof(struct search_state));
-	state->refcount = 1;
-	state->ndots = 1;
-
-	return state;
-}
-
-static void
-search_postfix_clear(void) {
-	search_state_decref(global_search_state);
-
-	global_search_state = search_state_new();
-}
-
-/* exported function */
-void
-evdns_search_clear(void) {
-	search_postfix_clear();
-}
-
-static void
-search_postfix_add(const char *domain) {
-	int domain_len;
-	struct search_domain *sdomain;
-	while (domain[0] == '.') domain++;
-	domain_len = strlen(domain);
-
-	if (!global_search_state) global_search_state = search_state_new();
-        if (!global_search_state) return;
-	global_search_state->num_domains++;
-
-	sdomain = (struct search_domain *) malloc(sizeof(struct search_domain) + domain_len);
-        if (!sdomain) return;
-	memcpy( ((u8 *) sdomain) + sizeof(struct search_domain), domain, domain_len);
-	sdomain->next = global_search_state->head;
-	sdomain->len = domain_len;
-
-	global_search_state->head = sdomain;
-}
-
-/* reverse the order of members in the postfix list. This is needed because, */
-/* when parsing resolv.conf we push elements in the wrong order */
-static void
-search_reverse(void) {
-	struct search_domain *cur, *prev = NULL, *next;
-	cur = global_search_state->head;
-	while (cur) {
-		next = cur->next;
-		cur->next = prev;
-		prev = cur;
-		cur = next;
-	}
-
-	global_search_state->head = prev;
-}
-
-/* exported function */
-void
-evdns_search_add(const char *domain) {
-	search_postfix_add(domain);
-}
-
-/* exported function */
-void
-evdns_search_ndots_set(const int ndots) {
-	if (!global_search_state) global_search_state = search_state_new();
-        if (!global_search_state) return;
-	global_search_state->ndots = ndots;
-}
-
-static void
-search_set_from_hostname(void) {
-	char hostname[HOST_NAME_MAX + 1], *domainname;
-
-	search_postfix_clear();
-	if (gethostname(hostname, sizeof(hostname))) return;
-	domainname = strchr(hostname, '.');
-	if (!domainname) return;
-	search_postfix_add(domainname);
-}
-
-/* warning: returns malloced string */
-static char *
-search_make_new(const struct search_state *const state, int n, const char *const base_name) {
-	const int base_len = strlen(base_name);
-	const char need_to_append_dot = base_name[base_len - 1] == '.' ? 0 : 1;
-	struct search_domain *dom;
-
-	for (dom = state->head; dom; dom = dom->next) {
-		if (!n--) {
-			/* this is the postfix we want */
-			/* the actual postfix string is kept at the end of the structure */
-			const u8 *const postfix = ((u8 *) dom) + sizeof(struct search_domain);
-			const int postfix_len = dom->len;
-			char *const newname = (char *) malloc(base_len + need_to_append_dot + postfix_len + 1);
-                        if (!newname) return NULL;
-			memcpy(newname, base_name, base_len);
-			if (need_to_append_dot) newname[base_len] = '.';
-			memcpy(newname + base_len + need_to_append_dot, postfix, postfix_len);
-			newname[base_len + need_to_append_dot + postfix_len] = 0;
-			return newname;
-		}
-	}
-
-	/* we ran off the end of the list and still didn't find the requested string */
-	abort();
-	return NULL; /* unreachable; stops warnings in some compilers. */
-}
-
-static int
-search_request_new(int type, const char *const name, int flags, evdns_callback_type user_callback, void *user_arg) {
-	assert(type == TYPE_A || type == TYPE_AAAA);
-	if ( ((flags & DNS_QUERY_NO_SEARCH) == 0) &&
-	     global_search_state &&
-		 global_search_state->num_domains) {
-		/* we have some domains to search */
-		struct request *req;
-		if (string_num_dots(name) >= global_search_state->ndots) {
-			req = request_new(type, name, flags, user_callback, user_arg);
-			if (!req) return 1;
-			req->search_index = -1;
-		} else {
-			char *const new_name = search_make_new(global_search_state, 0, name);
-                        if (!new_name) return 1;
-			req = request_new(type, new_name, flags, user_callback, user_arg);
-			free(new_name);
-			if (!req) return 1;
-			req->search_index = 0;
-		}
-		req->search_origname = strdup(name);
-		req->search_state = global_search_state;
-		req->search_flags = flags;
-		global_search_state->refcount++;
-		request_submit(req);
-		return 0;
-	} else {
-		struct request *const req = request_new(type, name, flags, user_callback, user_arg);
-		if (!req) return 1;
-		request_submit(req);
-		return 0;
-	}
-}
-
-/* this is called when a request has failed to find a name. We need to check */
-/* if it is part of a search and, if so, try the next name in the list */
-/* returns: */
-/*   0 another request has been submitted */
-/*   1 no more requests needed */
-static int
-search_try_next(struct request *const req) {
-	if (req->search_state) {
-		/* it is part of a search */
-		char *new_name;
-		struct request *newreq;
-		req->search_index++;
-		if (req->search_index >= req->search_state->num_domains) {
-			/* no more postfixes to try, however we may need to try */
-			/* this name without a postfix */
-			if (string_num_dots(req->search_origname) < req->search_state->ndots) {
-				/* yep, we need to try it raw */
-				struct request *const newreq = request_new(req->request_type, req->search_origname, req->search_flags, req->user_callback, req->user_pointer);
-				log(EVDNS_LOG_DEBUG, "Search: trying raw query %s", req->search_origname);
-				if (newreq) {
-					request_submit(newreq);
-					return 0;
-				}
-			}
-			return 1;
-		}
-
-		new_name = search_make_new(req->search_state, req->search_index, req->search_origname);
-                if (!new_name) return 1;
-		log(EVDNS_LOG_DEBUG, "Search: now trying %s (%d)", new_name, req->search_index);
-		newreq = request_new(req->request_type, new_name, req->search_flags, req->user_callback, req->user_pointer);
-		free(new_name);
-		if (!newreq) return 1;
-		newreq->search_origname = req->search_origname;
-		req->search_origname = NULL;
-		newreq->search_state = req->search_state;
-		newreq->search_flags = req->search_flags;
-		newreq->search_index = req->search_index;
-		newreq->search_state->refcount++;
-		request_submit(newreq);
-		return 0;
-	}
-	return 1;
-}
-
-static void
-search_request_finished(struct request *const req) {
-	if (req->search_state) {
-		search_state_decref(req->search_state);
-		req->search_state = NULL;
-	}
-	if (req->search_origname) {
-		free(req->search_origname);
-		req->search_origname = NULL;
-	}
-}
-
-/*/////////////////////////////////////////////////////////////////// */
-/* Parsing resolv.conf files */
-
-static void
-evdns_resolv_set_defaults(int flags) {
-	/* if the file isn't found then we assume a local resolver */
-	if (flags & DNS_OPTION_SEARCH) search_set_from_hostname();
-	if (flags & DNS_OPTION_NAMESERVERS) evdns_nameserver_ip_add("127.0.0.1");
-}
-
-#ifndef HAVE_STRTOK_R
-static char *
-strtok_r(char *s, const char *delim, char **state) {
-	return strtok(s, delim);
-}
-#endif
-
-/* helper version of atoi which returns -1 on error */
-static int
-strtoint(const char *const str) {
-	char *endptr;
-	const int r = strtol(str, &endptr, 10);
-	if (*endptr) return -1;
-	return r;
-}
-
-/* helper version of atoi that returns -1 on error and clips to bounds. */
-static int
-strtoint_clipped(const char *const str, int min, int max)
-{
-	int r = strtoint(str);
-	if (r == -1)
-		return r;
-	else if (r<min)
-		return min;
-	else if (r>max)
-		return max;
-	else
-		return r;
-}
-
-/* exported function */
-int
-evdns_set_option(const char *option, const char *val, int flags)
-{
-	if (!strncmp(option, "ndots:", 6)) {
-		const int ndots = strtoint(val);
-		if (ndots == -1) return -1;
-		if (!(flags & DNS_OPTION_SEARCH)) return 0;
-		log(EVDNS_LOG_DEBUG, "Setting ndots to %d", ndots);
-		if (!global_search_state) global_search_state = search_state_new();
-		if (!global_search_state) return -1;
-		global_search_state->ndots = ndots;
-	} else if (!strncmp(option, "timeout:", 8)) {
-		const int timeout = strtoint(val);
-		if (timeout == -1) return -1;
-		if (!(flags & DNS_OPTION_MISC)) return 0;
-		log(EVDNS_LOG_DEBUG, "Setting timeout to %d", timeout);
-		global_timeout.tv_sec = timeout;
-	} else if (!strncmp(option, "max-timeouts:", 12)) {
-		const int maxtimeout = strtoint_clipped(val, 1, 255);
-		if (maxtimeout == -1) return -1;
-		if (!(flags & DNS_OPTION_MISC)) return 0;
-		log(EVDNS_LOG_DEBUG, "Setting maximum allowed timeouts to %d",
-			maxtimeout);
-		global_max_nameserver_timeout = maxtimeout;
-	} else if (!strncmp(option, "max-inflight:", 13)) {
-		const int maxinflight = strtoint_clipped(val, 1, 65000);
-		if (maxinflight == -1) return -1;
-		if (!(flags & DNS_OPTION_MISC)) return 0;
-		log(EVDNS_LOG_DEBUG, "Setting maximum inflight requests to %d",
-			maxinflight);
-		global_max_requests_inflight = maxinflight;
-	} else if (!strncmp(option, "attempts:", 9)) {
-		int retries = strtoint(val);
-		if (retries == -1) return -1;
-		if (retries > 255) retries = 255;
-		if (!(flags & DNS_OPTION_MISC)) return 0;
-		log(EVDNS_LOG_DEBUG, "Setting retries to %d", retries);
-		global_max_retransmits = retries;
-	}
-	return 0;
-}
-
-static void
-resolv_conf_parse_line(char *const start, int flags) {
-	char *strtok_state;
-	static const char *const delims = " \t";
-#define NEXT_TOKEN strtok_r(NULL, delims, &strtok_state)
-
-	char *const first_token = strtok_r(start, delims, &strtok_state);
-	if (!first_token) return;
-
-	if (!strcmp(first_token, "nameserver") && (flags & DNS_OPTION_NAMESERVERS)) {
-		const char *const nameserver = NEXT_TOKEN;
-		struct in_addr ina;
-
-		if (inet_aton(nameserver, &ina)) {
-			/* address is valid */
-			evdns_nameserver_add(ina.s_addr);
-		}
-	} else if (!strcmp(first_token, "domain") && (flags & DNS_OPTION_SEARCH)) {
-		const char *const domain = NEXT_TOKEN;
-		if (domain) {
-			search_postfix_clear();
-			search_postfix_add(domain);
-		}
-	} else if (!strcmp(first_token, "search") && (flags & DNS_OPTION_SEARCH)) {
-		const char *domain;
-		search_postfix_clear();
-
-		while ((domain = NEXT_TOKEN)) {
-			search_postfix_add(domain);
-		}
-		search_reverse();
-	} else if (!strcmp(first_token, "options")) {
-		const char *option;
-		while ((option = NEXT_TOKEN)) {
-			const char *val = strchr(option, ':');
-			evdns_set_option(option, val ? val+1 : "", flags);
-		}
-	}
-#undef NEXT_TOKEN
-}
-
-/* exported function */
-/* returns: */
-/*   0 no errors */
-/*   1 failed to open file */
-/*   2 failed to stat file */
-/*   3 file too large */
-/*   4 out of memory */
-/*   5 short read from file */
-int
-evdns_resolv_conf_parse(int flags, const char *const filename) {
-	struct stat st;
-	int fd, n, r;
-	u8 *resolv;
-	char *start;
-	int err = 0;
-
-	log(EVDNS_LOG_DEBUG, "Parsing resolv.conf file %s", filename);
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0) {
-		evdns_resolv_set_defaults(flags);
-		return 1;
-	}
-
-	if (fstat(fd, &st)) { err = 2; goto out1; }
-	if (!st.st_size) {
-		evdns_resolv_set_defaults(flags);
-		err = (flags & DNS_OPTION_NAMESERVERS) ? 6 : 0;
-		goto out1;
-	}
-	if (st.st_size > 65535) { err = 3; goto out1; }  /* no resolv.conf should be any bigger */
-
-	resolv = (u8 *) malloc((size_t)st.st_size + 1);
-	if (!resolv) { err = 4; goto out1; }
-
-	n = 0;
-	while ((r = read(fd, resolv+n, (size_t)st.st_size-n)) > 0) {
-		n += r;
-		if (n == st.st_size)
-			break;
-		assert(n < st.st_size);
- 	}
-	if (r < 0) { err = 5; goto out2; }
-	resolv[n] = 0;	 /* we malloced an extra byte; this should be fine. */
-
-	start = (char *) resolv;
-	for (;;) {
-		char *const newline = strchr(start, '\n');
-		if (!newline) {
-			resolv_conf_parse_line(start, flags);
-			break;
-		} else {
-			*newline = 0;
-			resolv_conf_parse_line(start, flags);
-			start = newline + 1;
-		}
-	}
-
-	if (!server_head && (flags & DNS_OPTION_NAMESERVERS)) {
-		/* no nameservers were configured. */
-		evdns_nameserver_ip_add("127.0.0.1");
-		err = 6;
-	}
-	if (flags & DNS_OPTION_SEARCH && (!global_search_state || global_search_state->num_domains == 0)) {
-		search_set_from_hostname();
-	}
-
-out2:
-	free(resolv);
-out1:
-	close(fd);
-	return err;
-}
-
-#ifdef WIN32
-/* Add multiple nameservers from a space-or-comma-separated list. */
-static int
-evdns_nameserver_ip_add_line(const char *ips) {
-	const char *addr;
-	char *buf;
-	int r;
-	while (*ips) {
-		while (ISSPACE(*ips) || *ips == ',' || *ips == '\t')
-			++ips;
-		addr = ips;
-		while (ISDIGIT(*ips) || *ips == '.' || *ips == ':')
-			++ips;
-		buf = malloc(ips-addr+1);
-		if (!buf) return 4;
-		memcpy(buf, addr, ips-addr);
-		buf[ips-addr] = '\0';
-		r = evdns_nameserver_ip_add(buf);
-		free(buf);
-		if (r) return r;
-	}
-	return 0;
-}
-
-typedef DWORD(WINAPI *GetNetworkParams_fn_t)(FIXED_INFO *, DWORD*);
-
-/* Use the windows GetNetworkParams interface in iphlpapi.dll to */
-/* figure out what our nameservers are. */
-static int
-load_nameservers_with_getnetworkparams(void)
-{
-	/* Based on MSDN examples and inspection of  c-ares code. */
-	FIXED_INFO *fixed;
-	HMODULE handle = 0;
-	ULONG size = sizeof(FIXED_INFO);
-	void *buf = NULL;
-	int status = 0, r, added_any;
-	IP_ADDR_STRING *ns;
-	GetNetworkParams_fn_t fn;
-
-	if (!(handle = LoadLibrary("iphlpapi.dll"))) {
-		log(EVDNS_LOG_WARN, "Could not open iphlpapi.dll");
-		status = -1;
-		goto done;
-	}
-	if (!(fn = (GetNetworkParams_fn_t) GetProcAddress(handle, "GetNetworkParams"))) {
-		log(EVDNS_LOG_WARN, "Could not get address of function.");
-		status = -1;
-		goto done;
-	}
-
-	buf = malloc(size);
-	if (!buf) { status = 4; goto done; }
-	fixed = buf;
-	r = fn(fixed, &size);
-	if (r != ERROR_SUCCESS && r != ERROR_BUFFER_OVERFLOW) {
-		status = -1;
-		goto done;
-	}
-	if (r != ERROR_SUCCESS) {
-		free(buf);
-		buf = malloc(size);
-		if (!buf) { status = 4; goto done; }
-		fixed = buf;
-		r = fn(fixed, &size);
-		if (r != ERROR_SUCCESS) {
-			log(EVDNS_LOG_DEBUG, "fn() failed.");
-			status = -1;
-			goto done;
-		}
-	}
-
-	assert(fixed);
-	added_any = 0;
-	ns = &(fixed->DnsServerList);
-	while (ns) {
-		r = evdns_nameserver_ip_add_line(ns->IpAddress.String);
-		if (r) {
-			log(EVDNS_LOG_DEBUG,"Could not add nameserver %s to list,error: %d",
-				(ns->IpAddress.String),(int)GetLastError());
-			status = r;
-			goto done;
-		} else {
-			log(EVDNS_LOG_DEBUG,"Succesfully added %s as nameserver",ns->IpAddress.String);
-		}
-
-		added_any++;
-		ns = ns->Next;
-	}
-
-	if (!added_any) {
-		log(EVDNS_LOG_DEBUG, "No nameservers added.");
-		status = -1;
-	}
-
- done:
-	if (buf)
-		free(buf);
-	if (handle)
-		FreeLibrary(handle);
-	return status;
-}
-
-static int
-config_nameserver_from_reg_key(HKEY key, const char *subkey)
-{
-	char *buf;
-	DWORD bufsz = 0, type = 0;
-	int status = 0;
-
-	if (RegQueryValueEx(key, subkey, 0, &type, NULL, &bufsz)
-	    != ERROR_MORE_DATA)
-		return -1;
-	if (!(buf = malloc(bufsz)))
-		return -1;
-
-	if (RegQueryValueEx(key, subkey, 0, &type, (LPBYTE)buf, &bufsz)
-	    == ERROR_SUCCESS && bufsz > 1) {
-		status = evdns_nameserver_ip_add_line(buf);
-	}
-
-	free(buf);
-	return status;
-}
-
-#define SERVICES_KEY "System\\CurrentControlSet\\Services\\"
-#define WIN_NS_9X_KEY  SERVICES_KEY "VxD\\MSTCP"
-#define WIN_NS_NT_KEY  SERVICES_KEY "Tcpip\\Parameters"
-
-static int
-load_nameservers_from_registry(void)
-{
-	int found = 0;
-	int r;
-#define TRY(k, name) \
-	if (!found && config_nameserver_from_reg_key(k,name) == 0) {	\
-		log(EVDNS_LOG_DEBUG,"Found nameservers in %s/%s",#k,name); \
-		found = 1;						\
-	} else if (!found) {						\
-		log(EVDNS_LOG_DEBUG,"Didn't find nameservers in %s/%s", \
-		    #k,#name);						\
-	}
-
-	if (((int)GetVersion()) > 0) { /* NT */
-		HKEY nt_key = 0, interfaces_key = 0;
-
-		if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0,
-				 KEY_READ, &nt_key) != ERROR_SUCCESS) {
-			log(EVDNS_LOG_DEBUG,"Couldn't open nt key, %d",(int)GetLastError());
-			return -1;
-		}
-		r = RegOpenKeyEx(nt_key, "Interfaces", 0,
-			     KEY_QUERY_VALUE|KEY_ENUMERATE_SUB_KEYS,
-			     &interfaces_key);
-		if (r != ERROR_SUCCESS) {
-			log(EVDNS_LOG_DEBUG,"Couldn't open interfaces key, %d",(int)GetLastError());
-			return -1;
-		}
-		TRY(nt_key, "NameServer");
-		TRY(nt_key, "DhcpNameServer");
-		TRY(interfaces_key, "NameServer");
-		TRY(interfaces_key, "DhcpNameServer");
-		RegCloseKey(interfaces_key);
-		RegCloseKey(nt_key);
-	} else {
-		HKEY win_key = 0;
-		if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, WIN_NS_9X_KEY, 0,
-				 KEY_READ, &win_key) != ERROR_SUCCESS) {
-			log(EVDNS_LOG_DEBUG, "Couldn't open registry key, %d", (int)GetLastError());
-			return -1;
-		}
-		TRY(win_key, "NameServer");
-		RegCloseKey(win_key);
-	}
-
-	if (found == 0) {
-		log(EVDNS_LOG_WARN,"Didn't find any nameservers.");
-	}
-
-	return found ? 0 : -1;
-#undef TRY
-}
-
-int
-evdns_config_windows_nameservers(void)
-{
-	if (load_nameservers_with_getnetworkparams() == 0)
-		return 0;
-	return load_nameservers_from_registry();
-}
-#endif
-
-int
-evdns_init(void)
-{
-	int res = 0;
-#ifdef WIN32
-	evdns_config_windows_nameservers();
-#else
-	res = evdns_resolv_conf_parse(DNS_OPTIONS_ALL, "/etc/resolv.conf");
-#endif
-
-	return (res);
-}
-
-const char *
-evdns_err_to_string(int err)
-{
-    switch (err) {
-	case DNS_ERR_NONE: return "no error";
-	case DNS_ERR_FORMAT: return "misformatted query";
-	case DNS_ERR_SERVERFAILED: return "server failed";
-	case DNS_ERR_NOTEXIST: return "name does not exist";
-	case DNS_ERR_NOTIMPL: return "query not implemented";
-	case DNS_ERR_REFUSED: return "refused";
-
-	case DNS_ERR_TRUNCATED: return "reply truncated or ill-formed";
-	case DNS_ERR_UNKNOWN: return "unknown";
-	case DNS_ERR_TIMEOUT: return "request timed out";
-	case DNS_ERR_SHUTDOWN: return "dns subsystem shut down";
-	default: return "[Unknown error code]";
-    }
-}
-
-void
-evdns_shutdown(int fail_requests)
-{
-	struct nameserver *server, *server_next;
-	struct search_domain *dom, *dom_next;
-
-	while (req_head) {
-		if (fail_requests)
-			reply_callback(req_head, 0, DNS_ERR_SHUTDOWN, NULL);
-		request_finished(req_head, &req_head);
-	}
-	while (req_waiting_head) {
-		if (fail_requests)
-			reply_callback(req_waiting_head, 0, DNS_ERR_SHUTDOWN, NULL);
-		request_finished(req_waiting_head, &req_waiting_head);
-	}
-	global_requests_inflight = global_requests_waiting = 0;
-
-	for (server = server_head; server; server = server_next) {
-		server_next = server->next;
-		if (server->socket >= 0)
-			CLOSE_SOCKET(server->socket);
-		(void) event_del(&server->event);
-		if (server->state == 0)
-                        (void) event_del(&server->timeout_event);
-		free(server);
-		if (server_next == server_head)
-			break;
-	}
-	server_head = NULL;
-	global_good_nameservers = 0;
-
-	if (global_search_state) {
-		for (dom = global_search_state->head; dom; dom = dom_next) {
-			dom_next = dom->next;
-			free(dom);
-		}
-		free(global_search_state);
-		global_search_state = NULL;
-	}
-	evdns_log_fn = NULL;
-}
-
-#ifdef EVDNS_MAIN
-void
-main_callback(int result, char type, int count, int ttl,
-			  void *addrs, void *orig) {
-	char *n = (char*)orig;
-	int i;
-	for (i = 0; i < count; ++i) {
-		if (type == DNS_IPv4_A) {
-			printf("%s: %s\n", n, debug_ntoa(((u32*)addrs)[i]));
-		} else if (type == DNS_PTR) {
-			printf("%s: %s\n", n, ((char**)addrs)[i]);
-		}
-	}
-	if (!count) {
-		printf("%s: No answer (%d)\n", n, result);
-	}
-	fflush(stdout);
-}
-void
-evdns_server_callback(struct evdns_server_request *req, void *data)
-{
-	int i, r;
-	(void)data;
-	/* dummy; give 192.168.11.11 as an answer for all A questions,
-	 *	give foo.bar.example.com as an answer for all PTR questions. */
-	for (i = 0; i < req->nquestions; ++i) {
-		u32 ans = htonl(0xc0a80b0bUL);
-		if (req->questions[i]->type == EVDNS_TYPE_A &&
-			req->questions[i]->class == EVDNS_CLASS_INET) {
-			printf(" -- replying for %s (A)\n", req->questions[i]->name);
-			r = evdns_server_request_add_a_reply(req, req->questions[i]->name,
-										  1, &ans, 10);
-			if (r<0)
-				printf("eeep, didn't work.\n");
-		} else if (req->questions[i]->type == EVDNS_TYPE_PTR &&
-				   req->questions[i]->class == EVDNS_CLASS_INET) {
-			printf(" -- replying for %s (PTR)\n", req->questions[i]->name);
-			r = evdns_server_request_add_ptr_reply(req, NULL, req->questions[i]->name,
-											"foo.bar.example.com", 10);
-		} else {
-			printf(" -- skipping %s [%d %d]\n", req->questions[i]->name,
-				   req->questions[i]->type, req->questions[i]->class);
-		}
-	}
-
-	r = evdns_request_respond(req, 0);
-	if (r<0)
-		printf("eeek, couldn't send reply.\n");
-}
-
-void
-logfn(int is_warn, const char *msg) {
-  (void) is_warn;
-  fprintf(stderr, "%s\n", msg);
-}
-int
-main(int c, char **v) {
-	int idx;
-	int reverse = 0, verbose = 1, servertest = 0;
-	if (c<2) {
-		fprintf(stderr, "syntax: %s [-x] [-v] hostname\n", v[0]);
-		fprintf(stderr, "syntax: %s [-servertest]\n", v[0]);
-		return 1;
-	}
-	idx = 1;
-	while (idx < c && v[idx][0] == '-') {
-		if (!strcmp(v[idx], "-x"))
-			reverse = 1;
-		else if (!strcmp(v[idx], "-v"))
-			verbose = 1;
-		else if (!strcmp(v[idx], "-servertest"))
-			servertest = 1;
-		else
-			fprintf(stderr, "Unknown option %s\n", v[idx]);
-		++idx;
-	}
-	event_init();
-	if (verbose)
-		evdns_set_log_fn(logfn);
-	evdns_resolv_conf_parse(DNS_OPTION_NAMESERVERS, "/etc/resolv.conf");
-	if (servertest) {
-		int sock;
-		struct sockaddr_in my_addr;
-		sock = socket(PF_INET, SOCK_DGRAM, 0);
-		fcntl(sock, F_SETFL, O_NONBLOCK);
-		my_addr.sin_family = AF_INET;
-		my_addr.sin_port = htons(10053);
-		my_addr.sin_addr.s_addr = INADDR_ANY;
-		if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr))<0) {
-			perror("bind");
-			exit(1);
-		}
-		evdns_add_server_port(sock, 0, evdns_server_callback, NULL);
-	}
-	for (; idx < c; ++idx) {
-		if (reverse) {
-			struct in_addr addr;
-			if (!inet_aton(v[idx], &addr)) {
-				fprintf(stderr, "Skipping non-IP %s\n", v[idx]);
-				continue;
-			}
-			fprintf(stderr, "resolving %s...\n",v[idx]);
-			evdns_resolve_reverse(&addr, 0, main_callback, v[idx]);
-		} else {
-			fprintf(stderr, "resolving (fwd) %s...\n",v[idx]);
-			evdns_resolve_ipv4(v[idx], 0, main_callback, v[idx]);
-		}
-	}
-	fflush(stdout);
-	event_dispatch();
-	return 0;
-}
-#endif