drop C codebase

5 files changed, 0 insertions, 922 deletions

diff --git a/Makefile b/Makefile
deleted file mode 100644
index 89c14f8..0000000
--- a/Makefile
+++ /dev/null
@@ -1,21 +0,0 @@
-CC ?= gcc
-CFLAGS = -std=c99 -Wall -Werror -I include
-
-0tDNS : build/0tDNS.o build/receive_respond.o
-	$(CC) $^ -lunbound -lldns -o $@
-
-build/%.o : src/%.c | build
-	gcc $(CFLAGS) $^ -c -o $@
-
-ask_resolver : build/ask_resolver.o
-	$(CC) $^ -lunbound -o $@
-
-build :
-	mkdir build
-
-all : 0tDNS receive_respond
-
-clean :
-	-rm -r build 0tDNS ask_resolver
-
-.PHONY : clean
diff --git a/include/log.h b/include/log.h
deleted file mode 100644
index 154e6ec..0000000
--- a/include/log.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef ZTDNS_LOG_H
-#define ZTDNS_LOG_H
-
-#include <stdio.h>
-
-/* These functions will change later - it's just a "mock", so that every1 can
- * already write code with ztdns_info() :)
- * Use like ztdns_info("something wrong happened! %s", errorstring);
- */
-#define ztdns_debug(printfargs...) printf(printfargs)
-#define ztdns_info(printfargs...) printf(printfargs)
-#define ztdns_warn(printfargs...) printf(printfargs)
-#define ztdns_error(printfargs...) printf(printfargs)
-
-#endif /* ZTDNS_LOG_H */
diff --git a/src/0tDNS.c b/src/0tDNS.c
deleted file mode 100644
index 180b336..0000000
--- a/src/0tDNS.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/*
- * Code in examine_result() is taken from official libunbound examples:
- * https://nlnetlabs.nl/documentation/unbound/libunbound-tutorial-3/
- * The rest of this file is
- * Copyright (C) 2020 by Wojtek Kosior <echo a3dvanR1c0Bwcm90b25tYWlsLmNvbQo= | base64 --decode>
-
- * Permission to use, copy, modify, and/or distribute this software
- * for any purpose with or without fee is hereby granted.
-
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
- * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
- * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
- * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <arpa/inet.h>
-#include <stdbool.h>
-
-#include <unbound.h>
-#include <ldns/ldns.h>
-
-#include "log.h"
-
-#define LISTEN_PORT 53
-#define IPADDR_BUFLEN 50
-
-/* From receive_respond.c */
-int udp_bind(int, uint16_t);
-int socket_create(uint16_t);
-ldns_pkt *receive_and_print(int);
-int respond_query(int, const char*, const char*, ldns_rr*, uint16_t);
-char *hostnamefrompkt(ldns_pkt*, ldns_rr**);
-	
-
-/* To specify when creating unbound context - has nothing to do with
- * out logging facility
- */
-#define DEFAULT_DEBUGLEVEL 0
-
-/*
- * This is the path in Debian - in other systems it will be different
- * and we will need to either somehow find it dynamically or get the path
- * from the user.
- */
-#define CA_BUNDLE_FILE "/etc/ssl/certs/ca-certificates.crt"
-
-/* In the long run me might rename this file to somewhere else... */
-#define TRUST_ANCHOR_FILE "./root.key"
-
-#define MALLOC_FAILURE_STRING "Couldn't allocate memory.\n"
-
-/* examine the result structure in detail */
-const char *examine_result(const char *query, struct ub_result *result,
-			   char *ipaddr_buf)
-{
-        int i;
-        int num;
-	char buf[IPADDR_BUFLEN];
-	char *ipaddr_buf_used;
-
-	ipaddr_buf_used = ipaddr_buf ? ipaddr_buf : buf;
-
-        printf("The query is for: %s\n", query);
-        printf("The result has:\n");
-        printf("qname: %s\n", result->qname);
-        printf("qtype: %d\n", result->qtype);
-        printf("qclass: %d\n", result->qclass);
-        if(result->canonname)
-                printf("canonical name: %s\n",
-		       result->canonname);
-        else    printf("canonical name: <none>\n");
-
-        if(result->havedata)
-                printf("has data\n");
-        else    printf("has no data\n");
-
-        if(result->nxdomain)
-                printf("nxdomain (name does not exist)\n");
-        else    printf("not an nxdomain (name exists)\n");
-
-        if(result->secure)
-                printf("validated to be secure\n");
-        else    printf("not validated as secure\n");
-
-        if(result->bogus)
-                printf("a security failure! (bogus)\n");
-        else    printf("not a security failure (not bogus)\n");
-
-        printf("DNS rcode: %d\n", result->rcode);
-
-        if(!result->havedata)
-		return NULL;
-
-        num = 0;
-        for(i=0; result->data[i]; i++) {
-                printf("result data element %d has length %d\n",
-		       i, result->len[i]);
-                printf("result data element %d is: %s\n", i,
-		       inet_ntop(AF_INET, (struct in_addr*) result->data[i],
-				 ipaddr_buf_used, IPADDR_BUFLEN));
-                num++;
-        }
-        printf("result has %d data element(s)\n", num);
-
-	return ipaddr_buf;
-}
-
-enum resolution_mode {
-	RECURSIVE,
-	FULL,
-	RESOLV_CONF
-};
-
-struct ub_ctx *ztdns_create_ub_context(enum resolution_mode mode,
-				       const char *resolver_addr,
-				       int debuglevel)
-{
-	int rc;
-	struct ub_ctx* ctx;
-	const char *error_message_format;
-
-        ctx = ub_ctx_create();
-        if (!ctx) {
-		fprintf(stderr, "Couldn't create libunbound context.\n");
-		return NULL;
-	}
-
-	if (mode == RECURSIVE) {
-		error_message_format = "Couldn't set forward server: %s\n";
-		rc = ub_ctx_set_fwd(ctx, resolver_addr);
-		if (rc)
-			goto out;
-		/* Make DNS over TLS mandatory for recursive resolvers */
-		/* TODO tls not working for some reason - this has to be fixed */
-		/* error_message_format = "Couldn't enable DNS over TLS: %s\n"; */
-		/* rc = ub_ctx_set_tls(ctx, 1); */
-		/* if (rc) */
-		/* 	goto out; */
-		/* rc = ub_ctx_set_option(ctx, "tls-cert-bundle:", CA_BUNDLE_FILE); */
-	} else if (mode == FULL) {
-		/* TODO use root_hints here for better reliability */
-		/* For iterative queries we use DNSSEC if possible */
-		error_message_format = "Couldn't set trust anchors: %s\n";
-		rc = ub_ctx_add_ta_autr(ctx, TRUST_ANCHOR_FILE);
-	} else /* if (mode == RESOLV_CONF) */ {
-		/* NULL can be passed to use system's default resolv.conf */
-		error_message_format = "Couldn't use system resolv.conf: %s\n";
-		rc = ub_ctx_resolvconf(ctx, NULL);
-	}
-
-	if (rc)
-		goto out;
-
-	error_message_format = "Couldn't set debuglevel: %s\n";
-	rc = ub_ctx_debuglevel(ctx, debuglevel);
-
-out:
-	if (rc) {
-		fprintf(stderr, error_message_format, ub_strerror(rc));
-		ub_ctx_delete(ctx);
-		return NULL;
-	}
-
-	return ctx;
-}
-
-const char *ztdns_try_resolve(struct ub_ctx *ctx, const char *name,
-			      char *ipaddr_buf)
-{
-	struct ub_result* result;
-	int rc;
-	const char *ipaddr = NULL;
-	
-        rc = ub_resolve(ctx, name,
-			1 /* TYPE A (IPv4 address) */,
-			1 /* CLASS IN (internet) */, &result);
-        if(rc)
-                printf("resolve error: %s\n", ub_strerror(rc));
-	else {
-		ipaddr = examine_result(name, result, ipaddr_buf);
-		ub_resolve_free(result);
-	}
-
-	return ipaddr;
-}
-
-struct ztdns_resolver {
-	struct ub_ctx *ctx;
-	const char *name; /* arbitrary name - only used for printing to user */
-	const char *address; /* IP addr in dot notation stored as string */
-	/* Compatible answer must be returned by resolvers with their
-	 * trust levels summing to at least 100 - otherwise the answer is
-	 * considered unreliable.
-	 */
-	uint8_t trust_level;
-	/* Whether we want ztdns to report when this resolver gives answer,
-	 * that is not confirmed by others (i.e. trust levels sum for this
-	 * answer doesn't reach 100).
-	 */
-	bool report_errors;
-	struct ztdns_resolver *next;
-};
-
-struct ztdns_resolver *ztdns_create_recursive_resolver
-(const char *name, const char *address, uint8_t trust_level, bool report_errors,
- int debuglevel)
-{
-	struct ztdns_resolver *resolver;
-	resolver = malloc(sizeof(struct ztdns_resolver));
-	if (!resolver) {
-		fprintf(stderr, MALLOC_FAILURE_STRING);
-		return NULL;
-	}
-
-	resolver->ctx = ztdns_create_ub_context(RECURSIVE, address, debuglevel);
-	if (!resolver->ctx)
-		goto out_err;
-
-	resolver->name = name;
-	resolver->address = address;
-	resolver->trust_level = trust_level;
-	resolver->report_errors = report_errors;
-	resolver->next = NULL;
-	return resolver;
-
-out_err:
-	free(resolver);
-	return NULL;
-}
-
-void ztdns_delete_recursive_resolver(struct ztdns_resolver *resolver)
-{
-	ub_ctx_delete(resolver->ctx);
-	free(resolver);
-}
-
-struct ztdns_instance {
-        struct ub_ctx *ctx_resolv_conf, *ctx_full;
-	struct ztdns_resolver *recursive_resolvers;
-};
-
-/*
- * Hardcoded recursive DNS servers. A temporary solution - those should
- * ideally by obtained from command line or configuration file.
- */
-const char *resolvers_addresses[] = {"8.8.8.8", "8.8.4.4", "1.1.1.1"};
-const char *resolvers_names[] = {"google", "google", "cloudflare"};
-uint8_t resolvers_trust_levels[] = {40, 40, 80};
-uint8_t resolvers_report_errors[] = {true, true, false};
-
-#define RESOLVERS_COUNT 3
-
-struct ztdns_instance *ztdns_create_instance(int argc, char **argv)
-{
-	struct ztdns_instance *ztdns;
-	int i;
-	struct ztdns_resolver *tmp;
-
-	ztdns = malloc(sizeof(struct ztdns_instance));
-	if (!ztdns) {
-		/* This is an example of how rest of the code shold be
-		 * written/rewritten to use our logging facility.
-		 */
-		ztdns_error("No memory, no fun :(\n");
-		return NULL;
-	}
-
-	/* Create context for performing full resolution */
-	ztdns->ctx_full =
-		ztdns_create_ub_context(FULL, NULL, DEFAULT_DEBUGLEVEL);
-	if (!ztdns->ctx_full)
-		goto out_err_cleanup_instance;
-
-	/* Create context for performing resolution with default resolver */
-	ztdns->ctx_resolv_conf =
-		ztdns_create_ub_context(RESOLV_CONF, NULL, DEFAULT_DEBUGLEVEL);
-	if (!ztdns->ctx_resolv_conf)
-		goto out_err_cleanup_ctx_full;
-
-	/* Create contexts for performing resolution with resolvers provided
-	 *  by user (well, hardcoded ones in this case)
-	 */
-	ztdns->recursive_resolvers = NULL;
-	for (i = 0; i < RESOLVERS_COUNT; i++) {
-		tmp = ztdns_create_recursive_resolver
-			(resolvers_names[i], resolvers_addresses[i],
-			 resolvers_trust_levels[i], resolvers_report_errors[i],
-			 DEFAULT_DEBUGLEVEL);
-		if (!tmp)
-			goto out_err_cleanup_recursive_resolvers;
-
-		tmp->next = ztdns->recursive_resolvers;
-		ztdns->recursive_resolvers = tmp;
-	}
-
-	return ztdns;
-
-out_err_cleanup_recursive_resolvers:
-	while (ztdns->recursive_resolvers) {
-		tmp = ztdns->recursive_resolvers->next;
-		ztdns_delete_recursive_resolver(ztdns->recursive_resolvers);
-		ztdns->recursive_resolvers = tmp;
-	}
-
-	ub_ctx_delete(ztdns->ctx_resolv_conf);
-out_err_cleanup_ctx_full:
-	ub_ctx_delete(ztdns->ctx_full);
-out_err_cleanup_instance:
-	free(ztdns);
-	return NULL;
-}
-
-void ztdns_delete_instance(struct ztdns_instance *ztdns)
-{
-	struct ztdns_resolver *tmp;
-
-	while (ztdns->recursive_resolvers) {
-		tmp = ztdns->recursive_resolvers->next;
-		ztdns_delete_recursive_resolver(ztdns->recursive_resolvers);
-		ztdns->recursive_resolvers = tmp;
-	}
-
-	ub_ctx_delete(ztdns->ctx_resolv_conf);
-	ub_ctx_delete(ztdns->ctx_full);
-	free(ztdns);
-}
-
-const char *smart_resolve(struct ztdns_instance *ztdns,
-			  const char *queried_name,
-			  char ipaddr_buf[IPADDR_BUFLEN])
-{
-	struct ztdns_resolver *tmp;
-	
-	printf("* FULL RESOLUTION\n");
-	ztdns_try_resolve(ztdns->ctx_full, queried_name, ipaddr_buf);
-	printf("* USING RESOLVER FROM resolv.conf\n");
-	ztdns_try_resolve(ztdns->ctx_resolv_conf, queried_name, NULL);
-
-	for (tmp = ztdns->recursive_resolvers; tmp; tmp = tmp->next) {
-		printf("* VIA %s (%s)\n", tmp->name, tmp->address);
-		ztdns_try_resolve(tmp->ctx, queried_name, NULL);
-	}
-
-	return NULL;
-}
-
-int handle_query(struct ztdns_instance *ztdns, int socket)
-{
-	ldns_pkt *query;
-	ldns_rr  *query_rr;
-	uint16_t id;
-	int rc = 1;
-	char *queried_name;
-	char ipaddr[IPADDR_BUFLEN];
-	
-	query = receive_and_print(socket);
-	if (!query)
-		return 1;
-
-	queried_name = hostnamefrompkt(query, &query_rr);
-	if (!queried_name)
-		goto out_cleanup_query;
-
-	id = ldns_pkt_id(query);
-
-	smart_resolve(ztdns, queried_name, ipaddr); /* fill ipaddr[] */
-	rc = respond_query(socket, queried_name, ipaddr, query_rr, id);
-
-	free(queried_name);
-
-out_cleanup_query:
-	ldns_pkt_free(query);
-	return rc;
-}
-
-int main(int argc, char** argv)
-{
-	int rc = EXIT_FAILURE;
-	struct ztdns_instance *ztdns;
-	int socket;
-
-	if (geteuid()) {
-		ztdns_error("need root privileges\n");
-		return EXIT_FAILURE;
-	}
-
-	socket = socket_create(LISTEN_PORT);
-	if (socket < 0)
-		return EXIT_FAILURE;
-
-	ztdns = ztdns_create_instance(argc, argv);
-	if (!ztdns)
-		goto out_cleanup_socket;
-
-	while (1)
-		handle_query(ztdns, socket);
-
-	/* Later on we'll have some way of stopping the daemon - for now this
-	 * line is unreachable */
-	ztdns_delete_instance(ztdns);
-
-out_cleanup_socket:
-	close(socket);
-	return rc;
-	
-	/*
-	 * The adsuck program would additionally do many cool things in main(),
-	 * i.e. parse command line options, drop root privileges, setup signal
-	 * handlers, etc. We could incorporate some of this into our program
-	 * later. I omitted it for now for simplicity and to ease porting to
-	 * windoze if You guys want to do that (but don't count on me in this
-	 * matter).
-	 */
-}
diff --git a/src/ask_resolver.c b/src/ask_resolver.c
deleted file mode 100644
index dc7c660..0000000
--- a/src/ask_resolver.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * Code in examine_result() is taken from official libunbound examples:
- * https://nlnetlabs.nl/documentation/unbound/libunbound-tutorial-3/
- * The rest of this file is
- * Copyright (C) 2020 by Wojtek Kosior <echo a3dvanR1c0Bwcm90b25tYWlsLmNvbQo= | base64 --decode>
-
- * Permission to use, copy, modify, and/or distribute this software
- * for any purpose with or without fee is hereby granted.
-
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
- * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
- * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
- * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-
-/*
- * This is a simple helper program for testing our resolver.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <arpa/inet.h>
-
-#include <unbound.h>
-
-/* examine the result structure in detail */
-void examine_result(const char *query, struct ub_result *result)
-{
-        int i;
-        int num;
-
-        printf("The query is for: %s\n", query);
-        printf("The result has:\n");
-        printf("qname: %s\n", result->qname);
-        printf("qtype: %d\n", result->qtype);
-        printf("qclass: %d\n", result->qclass);
-        if(result->canonname)
-                printf("canonical name: %s\n",
-		       result->canonname);
-        else    printf("canonical name: <none>\n");
-
-        if(result->havedata)
-                printf("has data\n");
-        else    printf("has no data\n");
-
-        if(result->nxdomain)
-                printf("nxdomain (name does not exist)\n");
-        else    printf("not an nxdomain (name exists)\n");
-
-        if(result->secure)
-                printf("validated to be secure\n");
-        else    printf("not validated as secure\n");
-
-        if(result->bogus)
-                printf("a security failure! (bogus)\n");
-        else    printf("not a security failure (not bogus)\n");
-
-        printf("DNS rcode: %d\n", result->rcode);
-
-        if(!result->havedata)
-		return;
-
-        num = 0;
-        for(i=0; result->data[i]; i++) {
-                printf("result data element %d has length %d\n",
-		       i, result->len[i]);
-                printf("result data element %d is: %s\n",
-		       i, inet_ntoa(*(struct in_addr*)result->data[i]));
-                num++;
-        }
-        printf("result has %d data element(s)\n", num);
-}
-
-struct ub_ctx *create_ub_context(char *forwarder_addr, int debuglevel)
-{
-	int rc;
-	struct ub_ctx* ctx;
-	char *error_message_format;
-
-        ctx = ub_ctx_create();
-        if (!ctx) {
-		fprintf(stderr, "Couldn't create libunbound context.\n");
-		return NULL;
-	}
-
-	error_message_format = "Couldn't set forwarder: %s\n";
-	rc = ub_ctx_set_fwd(ctx, forwarder_addr);
-	if (rc)
-		goto out;
-
-	error_message_format = "Couldn't set debuglevel: %s\n";
-	rc = ub_ctx_debuglevel(ctx, debuglevel);
-
-out:
-	if (rc) {
-		fprintf(stderr, error_message_format, ub_strerror(rc));
-		ub_ctx_delete(ctx);
-		return NULL;
-	}
-
-	return ctx;
-}
-
-void ztdns_try_resolve(struct ub_ctx *ctx, const char *name)
-{
-	struct ub_result* result;
-	int rc;
-        rc = ub_resolve(ctx, name,
-			1 /* TYPE A (IPv4 address) */,
-			1 /* CLASS IN (internet) */, &result);
-        if(rc)
-                printf("resolve error: %s\n", ub_strerror(rc));
-	else {
-		examine_result(name, result);
-		ub_resolve_free(result);
-	}
-}
-
-int main(int argc, char** argv)
-{
-	struct ub_ctx *ctx;
-
-	if (argc != 3) {
-		printf("Usage: %s DNS_SERVER DOMAINNAME\n", argv[0]);
-		return EXIT_FAILURE;
-	}
-
-	ctx = create_ub_context(argv[1], 3);
-	if (!ctx)
-		return EXIT_FAILURE;
-
-	ztdns_try_resolve(ctx, argv[2]);
-
-	ub_ctx_delete(ctx);
-
-	return EXIT_SUCCESS;
-}
diff --git a/src/receive_respond.c b/src/receive_respond.c
deleted file mode 100644
index a3b1e8e..0000000
--- a/src/receive_respond.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/*
- * Copyright (c) 2009 - 2012 Marco Peereboom <marco@peereboom.us>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-/* for strdup() */
-#define _POSIX_C_SOURCE 200809L
-#include <string.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <err.h>
-
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
-#include <ldns/ldns.h>
-
-#define MAXLINE 256
-#define INBUF_SIZE 4096
-
-struct sockaddr		paddr;
-socklen_t		plen = (socklen_t)sizeof(paddr);
-
-int
-udp_bind(int sock, uint16_t port)
-{
-	struct sockaddr_in		addr;
-	in_addr_t			maddr = INADDR_ANY;
-
-	addr.sin_family = AF_INET;
-	addr.sin_port = (in_port_t) htons((uint16_t)port);
-	addr.sin_addr.s_addr = maddr;
-	return (bind(sock, (struct sockaddr*)&addr, (socklen_t) sizeof(addr)));
-}
-
-int
-socket_create(uint16_t port) {
-	int so = socket(AF_INET, SOCK_DGRAM, 0);
-	if (so == -1)
-		err(1, "can't open socket");
-	if (udp_bind(so, port))
-		err(1, "can't udp bind");
-	return so;
-}
-
-void
-printpacket(ldns_pkt *pkt)
-{
-	char			*str = ldns_pkt2str(pkt);
-
-	if (str) {
-		printf("%s", str);
-		LDNS_FREE(str);
-	} else
-		warnx("could not convert packet to string");
-}
-
-ldns_pkt *
-receive_and_print(int so) {
-	uint8_t			inbuf[INBUF_SIZE];
-	ssize_t			nb;
-	ldns_status		status;
-	ldns_pkt		*query_pkt;
-
-	nb = recvfrom(so, inbuf, INBUF_SIZE, 0, &paddr, &plen);
-	if (nb == -1) {
-		if (errno == EINTR || errno == EAGAIN)
-			return NULL;
-		else
-			err(EXIT_FAILURE, "recvfrom");
-	}
-
-	status = ldns_wire2pkt(&query_pkt, inbuf, (size_t)nb);
-	if (status != LDNS_STATUS_OK) {
-		warnx("bad packet: %s", ldns_get_errorstr_by_id(status));
-		return NULL;
-	} else {
-		puts("received packet:");
-		printpacket(query_pkt);
-	}
-
-	return query_pkt;
-}
-
-int
-send_response(int so, const char *hostname, ldns_pkt *respkt, uint16_t id)
-{
-	size_t			answer_size;
-	ldns_status		status;
-	uint8_t			*outbuf = NULL;
-	int			rv = 1;
-
-	if (hostname == NULL || respkt == NULL) {
-		warnx("send_response: invalid parameters");
-		return (0);
-	}
-
-	ldns_pkt_set_id(respkt, id);
-	status = ldns_pkt2wire(&outbuf, respkt, &answer_size);
-	if (status != LDNS_STATUS_OK)
-		warnx("can't create answer: %s",
-		      ldns_get_errorstr_by_id(status));
-	else {
-		puts("response packet:");
-		printpacket(respkt);
-
-		if (sendto(so, outbuf, answer_size, 0, &paddr, plen) == -1)
-			warn("send_response: sendto");
-		else {
-			rv = 0;
-
-			printf("send_response: resolved %s", hostname);
-		}
-	}
-
-	if (outbuf)
-		LDNS_FREE(outbuf);
-
-	return (rv);
-}
-
-char *
-hostnamefrompkt(ldns_pkt *pkt, ldns_rr **qrr)
-{
-	ldns_rr			*query_rr;
-	ldns_buffer		*out = NULL;
-	ldns_rdf		*rdf;
-	char			*ret = NULL;
-
-	if (pkt == NULL)
-		return (NULL);
-
-	query_rr = ldns_rr_list_rr(ldns_pkt_question(pkt), 0);
-	if (query_rr == NULL) {
-		warnx("hostnamefrompkt invalid parameters");
-		goto done;
-	}
-
-	out = ldns_buffer_new(LDNS_MAX_DOMAINLEN);
-	if (out == NULL) {
-		warnx("no memory for out buffer");
-		goto done;
-	}
-
-	rdf = ldns_rr_owner(query_rr);
-	if (ldns_rdf2buffer_str_dname(out, rdf) != LDNS_STATUS_OK) {
-		warnx("can't get hostname");
-		goto done;
-	}
-
-	ret = strdup((char *)ldns_buffer_begin(out));
-	if (ret == NULL) {
-		warn("no memory for hostname");
-		goto done;
-	}
-
-	if (qrr)
-		*qrr = query_rr;
-done:
-	if (out)
-		ldns_buffer_free(out);
-
-	return (ret);
-}
-
-int
-respond_query(int so, const char *hostname, const char *ipaddr,
-	      ldns_rr *query_rr, uint16_t id)
-{
-	ldns_status		status;
-	ldns_rr_list		*answer_an = NULL;
-	ldns_rr_list		*answer_ns = NULL;
-	ldns_rr_list		*answer_ad = NULL;
-	ldns_rr_list		*answer_qr = NULL;
-	ldns_pkt		*answer_pkt = NULL;
-	ldns_rr			*myrr = NULL, *myaurr = NULL, *myasrr = NULL;
-	ldns_rdf		*prev = NULL;
-	char			buf[MAXLINE * 2];
-	uint8_t			*outbuf = NULL;
-	int			rv = 1;
-
-	/* answer section */
-	answer_an = ldns_rr_list_new();
-	if (answer_an == NULL)
-		goto unwind;
-
-	/* authority section */
-	answer_ns = ldns_rr_list_new();
-	if (answer_ns == NULL)
-		goto unwind;
-
-	/* if we have an ip spoof it there */
-	if (ipaddr) {
-		/* an */
-		snprintf(buf, sizeof buf, "%s\t%d\tIN\tA\t%s",
-			 hostname, 259200, ipaddr);
-		status = ldns_rr_new_frm_str(&myrr, buf, 0, NULL, &prev);
-		if (status != LDNS_STATUS_OK) {
-			fprintf(stderr, "can't create answer section: %s\n",
-				ldns_get_errorstr_by_id(status));
-			goto unwind;
-		}
-		ldns_rr_list_push_rr(answer_an, myrr);
-		ldns_rdf_deep_free(prev);
-		prev = NULL;
-
-		/* ns */
-		snprintf(buf, sizeof buf, "%s\t%d\tIN\tNS\t%s.",
-			 hostname, 259200, "localhost");
-		status = ldns_rr_new_frm_str(&myaurr, buf, 0, NULL, &prev);
-		if (status != LDNS_STATUS_OK) {
-			fprintf(stderr, "can't create authority section: %s\n",
-				ldns_get_errorstr_by_id(status));
-			goto unwind;
-		}
-		ldns_rr_list_push_rr(answer_ns, myaurr);
-		ldns_rdf_deep_free(prev);
-		prev = NULL;
-	} else {
-		snprintf(buf, sizeof buf, "%s\t3600\tIN\tSOA\t%s root.%s %s",
-			 hostname,
-			 hostname,
-			 hostname,
-			 "2 3600 900 3600000 3600");
-		status = ldns_rr_new_frm_str(&myaurr, buf, 0, NULL, &prev);
-		if (status != LDNS_STATUS_OK) {
-			fprintf(stderr, "can't create authority section: %s\n",
-				ldns_get_errorstr_by_id(status));
-			goto unwind;
-		}
-		ldns_rr_list_push_rr(answer_ns, myaurr);
-		ldns_rdf_deep_free(prev);
-		prev = NULL;
-	}
-
-	/* question section */
-	answer_qr = ldns_rr_list_new();
-	if (answer_qr == NULL)
-		goto unwind;
-	ldns_rr_list_push_rr(answer_qr, ldns_rr_clone(query_rr));
-
-	/* additional section */
-	answer_ad = ldns_rr_list_new();
-	if (answer_ad == NULL)
-		goto unwind;
-	if (ipaddr) {
-		snprintf(buf, sizeof buf, "%s\t%d\tIN\tA\t%s",
-			 "localhost",
-			 259200,
-			 "127.0.0.1");
-		status = ldns_rr_new_frm_str(&myasrr, buf, 0, NULL, &prev);
-		if (status != LDNS_STATUS_OK) {
-			fprintf(stderr, "can't create additional section: %s\n",
-				ldns_get_errorstr_by_id(status));
-			goto unwind;
-		}
-		ldns_rr_list_push_rr(answer_ad, myasrr);
-		ldns_rdf_deep_free(prev);
-		prev = NULL;
-
-		/* V6 */
-		snprintf(buf, sizeof buf, "%s\t%d\tIN\tAAAA\t%s",
-			 "localhost",
-			 259200,
-			 "::1");
-		status = ldns_rr_new_frm_str(&myasrr, buf, 0, NULL, &prev);
-		if (status != LDNS_STATUS_OK) {
-			fprintf(stderr, "can't create additional section: %s\n",
-				ldns_get_errorstr_by_id(status));
-			goto unwind;
-		}
-		ldns_rr_list_push_rr(answer_ad, myasrr);
-		ldns_rdf_deep_free(prev);
-		prev = NULL;
-	}
-
-	/* actual packet */
-	answer_pkt = ldns_pkt_new();
-	if (answer_pkt == NULL)
-		goto unwind;
-
-	ldns_pkt_set_qr(answer_pkt, 1);
-	ldns_pkt_set_aa(answer_pkt, 1);
-	if (ipaddr == NULL)
-		ldns_pkt_set_rcode(answer_pkt, LDNS_RCODE_NXDOMAIN);
-
-	ldns_pkt_push_rr_list(answer_pkt, LDNS_SECTION_QUESTION, answer_qr);
-	ldns_pkt_push_rr_list(answer_pkt, LDNS_SECTION_ANSWER, answer_an);
-	ldns_pkt_push_rr_list(answer_pkt, LDNS_SECTION_AUTHORITY, answer_ns);
-	ldns_pkt_push_rr_list(answer_pkt, LDNS_SECTION_ADDITIONAL, answer_ad);
-
-	/* reply to caller */
-	if (send_response(so, hostname, answer_pkt, id))
-		warnx("send_response failed");
-
-unwind:
-	if (answer_pkt)
-		ldns_pkt_free(answer_pkt);
-	if (outbuf)
-		LDNS_FREE(outbuf);
-	if (answer_qr)
-		ldns_rr_list_free(answer_qr);
-	if (answer_an)
-		ldns_rr_list_free(answer_an);
-	if (answer_ns)
-		ldns_rr_list_free(answer_ns);
-	if (answer_ad)
-		ldns_rr_list_free(answer_ad);
-
-	return (rv);
-}