lib/lwres/lwconfig.c

	lwconfig.c revision ae6860081ff6cd3c1ec8329c4deb2d0da4802116
1633838b8255282d10af15c5c84cee5a51466712Bob Halley/*
499b34cea04a46823d003d4c0520c8b03e8513cbBrian Wellington * Copyright (C) 2000, 2001  Internet Software Consortium.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
1633838b8255282d10af15c5c84cee5a51466712Bob Halley * Permission to use, copy, modify, and distribute this software for any
1633838b8255282d10af15c5c84cee5a51466712Bob Halley * purpose with or without fee is hereby granted, provided that the above
1633838b8255282d10af15c5c84cee5a51466712Bob Halley * copyright notice and this permission notice appear in all copies.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
15a44745412679c30a6d022733925af70a38b715David Lawrence * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
15a44745412679c30a6d022733925af70a38b715David Lawrence * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
15a44745412679c30a6d022733925af70a38b715David Lawrence * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
15a44745412679c30a6d022733925af70a38b715David Lawrence * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
15a44745412679c30a6d022733925af70a38b715David Lawrence * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
15a44745412679c30a6d022733925af70a38b715David Lawrence * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
15a44745412679c30a6d022733925af70a38b715David Lawrence * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15a44745412679c30a6d022733925af70a38b715David Lawrence * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1633838b8255282d10af15c5c84cee5a51466712Bob Halley */
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
33f87146a856eb6c3dfd55a8ee9c173c94f82150Andreas Gustafsson/* $Id: lwconfig.c,v 1.32 2001/04/12 22:45:12 tale Exp $ */
9c3531d72aeaad6c5f01efe6a1c82023e1379e4dDavid Lawrence
d25afd60ee2286cb171c4960a790f3d7041b6f85Bob Halley/***
d25afd60ee2286cb171c4960a790f3d7041b6f85Bob Halley *** Module for parsing resolv.conf files.
94e25967cda41b886e33ec254b917d21df21a187Bob Halley ***
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence *** entry points are:
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews ***    lwres_conf_init(lwres_context_t *ctx)
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence ***        intializes data structure for subsequent config parsing.
94e25967cda41b886e33ec254b917d21df21a187Bob Halley ***
6e3a8256eed85f6704861d269ccfb35bdaeed5ffDavid Lawrence ***    lwres_conf_parse(lwres_context_t *ctx, const char *filename)
6e3a8256eed85f6704861d269ccfb35bdaeed5ffDavid Lawrence ***        parses a file and fills in the data structure.
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews ***
33f87146a856eb6c3dfd55a8ee9c173c94f82150Andreas Gustafsson ***    lwres_conf_print(lwres_context_t *ctx, FILE *fp)
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews ***        prints the config data structure to the FILE.
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence ***
94e25967cda41b886e33ec254b917d21df21a187Bob Halley ***    lwres_conf_clear(lwres_context_t *ctx)
364a82f7c25b62967678027043425201a5e5171aBob Halley ***        frees up all the internal memory used by the config data
94e25967cda41b886e33ec254b917d21df21a187Bob Halley ***         structure, returning it to the lwres_context_t.
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence ***
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence ***/
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <config.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence#include <assert.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <ctype.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <errno.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <stdlib.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <stdio.h>
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence#include <string.h>
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews#include <unistd.h>
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews#include <sys/types.h>
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley#include <lwres/lwbuffer.h>
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley#include <lwres/lwres.h>
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley#include <lwres/net.h>
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley#include <lwres/result.h>
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley#include "assert_p.h"
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley#include "context_p.h"
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#if ! defined(NS_INADDRSZ)
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#define NS_INADDRSZ  4
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#endif
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#if ! defined(NS_IN6ADDRSZ)
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#define NS_IN6ADDRSZ    16
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews#endif
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_parsenameserver(lwres_context_t *ctx,  FILE *fp);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_parselwserver(lwres_context_t *ctx,  FILE *fp);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_parsedomain(lwres_context_t *ctx, FILE *fp);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_parsesearch(lwres_context_t *ctx,  FILE *fp);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_parsesortlist(lwres_context_t *ctx,  FILE *fp);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsstatic lwres_result_t
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halleylwres_conf_parseoption(lwres_context_t *ctx,  FILE *fp);
3740b569ae76295b941d57a724a43beb75b533baBob Halley
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencestatic void
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencelwres_resetaddr(lwres_addr_t *addr);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencestatic lwres_result_t
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halleylwres_create_addr(const char *buff, lwres_addr_t *addr, int convert_zero);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halleystatic int lwresaddr2af(int lwresaddrtype);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halleystatic int
3740b569ae76295b941d57a724a43beb75b533baBob Halleylwresaddr2af(int lwresaddrtype)
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley{
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    int af = 0;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    switch (lwresaddrtype) {
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    case LWRES_ADDRTYPE_V4:
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        af = AF_INET;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        break;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    case LWRES_ADDRTYPE_V6:
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        af = AF_INET6;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        break;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    }
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    return (af);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley}
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence/*
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence * Eat characters from FP until EOL or EOF. Returns EOF or '\n'
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence */
232fd751edcb5dd2b1fd2666e039efe83d2e2b55Michael Sawyerstatic int
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrenceeatline(FILE *fp) {
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence    int ch;
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence    ch = fgetc(fp);
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence    while (ch != '\n' && ch != EOF)
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        ch = fgetc(fp);
3740b569ae76295b941d57a724a43beb75b533baBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    return (ch);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley}
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley/*
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley * Eats white space up to next newline or non-whitespace character (of
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley * EOF). Returns the last character read. Comments are considered white
3740b569ae76295b941d57a724a43beb75b533baBob Halley * space.
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencestatic int
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halleyeatwhite(FILE *fp) {
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    int ch;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    ch = fgetc(fp);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    while (ch != '\n' && ch != EOF && isspace((unsigned char)ch))
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        ch = fgetc(fp);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews    if (ch == ';' || ch == '#')
4d6964d70a114b53a11a3bd778d9b8f5179a7934Bob Halley        ch = eatline(fp);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    return (ch);
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews}
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence/*
94e25967cda41b886e33ec254b917d21df21a187Bob Halley * Skip over any leading whitespace and then read in the next sequence of
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews * non-whitespace characters. In this context newline is not considered
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews * whitespace. Returns EOF on end-of-file, or the character
94e25967cda41b886e33ec254b917d21df21a187Bob Halley * that caused the reading to stop.
94e25967cda41b886e33ec254b917d21df21a187Bob Halley */
94e25967cda41b886e33ec254b917d21df21a187Bob Halleystatic int
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencegetword(FILE *fp, char *buffer, size_t size) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    int ch;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    char *p = buffer;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    REQUIRE(buffer != NULL);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    REQUIRE(size > 0);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews    *p = '\0';
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews    ch = eatwhite(fp);
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews    if (ch == EOF)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        return (EOF);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
df0f58959ed82a2a43ca8d816ce9592541df9f2fMark Andrews    do {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        *p = '\0';
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence        if (ch == EOF || isspace((unsigned char)ch))
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            break;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        else if ((size_t) (p - buffer) == size - 1)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            return (EOF);   /* Not enough space. */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        *p++ = (char)ch;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        ch = fgetc(fp);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    } while (1);
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    return (ch);
94e25967cda41b886e33ec254b917d21df21a187Bob Halley}
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halleystatic void
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halleylwres_resetaddr(lwres_addr_t *addr) {
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    REQUIRE(addr != NULL);
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    memset(addr->address, 0, LWRES_ADDR_MAXLEN);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    addr->family = 0;
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    addr->length = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence}
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halleystatic char *
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrewslwres_strdup(lwres_context_t *ctx, const char *str) {
4b87939256ede703385e9cab92d3c58d03c31098Mark Andrews    char *p;
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    REQUIRE(str != NULL);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    REQUIRE(strlen(str) > 0);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    p = CTXMALLOC(strlen(str) + 1);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (p != NULL)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        strcpy(p, str);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    return (p);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence}
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewsvoid
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrewslwres_conf_init(lwres_context_t *ctx) {
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews    int i;
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews    lwres_conf_t *confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    REQUIRE(ctx != NULL);
70ec7dd74103fa9e92a6d56a0e3b0fc30e17af0dMark Andrews    confdata = &ctx->confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->nsnext = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->lwnext = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->domainname = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->searchnxt = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->sortlistnxt = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->resdebug = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->ndots = 1;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->no_tld_query = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    for (i = 0 ; i < LWRES_CONFMAXNAMESERVERS ; i++)
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley        lwres_resetaddr(&confdata->nameservers[i]);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    for (i = 0 ; i < LWRES_CONFMAXSEARCH ; i++)
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley        confdata->search[i] = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    for (i = 0 ; i < LWRES_CONFMAXSORTLIST ; i++) {
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley        lwres_resetaddr(&confdata->sortlist[i].addr);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley        lwres_resetaddr(&confdata->sortlist[i].mask);
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley    }
afdb3abb9b06ed4070ac9021f1f4427b4cb3a286Bob Halley}
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
3740b569ae76295b941d57a724a43beb75b533baBob Halleyvoid
bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halleylwres_conf_clear(lwres_context_t *ctx) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    int i;
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    lwres_conf_t *confdata;
bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    REQUIRE(ctx != NULL);
bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley    confdata = &ctx->confdata;
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley    for (i = 0 ; i < confdata->nsnext ; i++)
94e25967cda41b886e33ec254b917d21df21a187Bob Halley        lwres_resetaddr(&confdata->nameservers[i]);
bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    if (confdata->domainname != NULL) {
94e25967cda41b886e33ec254b917d21df21a187Bob Halley        CTXFREE(confdata->domainname,
94e25967cda41b886e33ec254b917d21df21a187Bob Halley            strlen(confdata->domainname) + 1);
94e25967cda41b886e33ec254b917d21df21a187Bob Halley        confdata->domainname = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    }
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    for (i = 0 ; i < confdata->searchnxt ; i++) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        if (confdata->search[i] != NULL) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            CTXFREE(confdata->search[i],
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence                strlen(confdata->search[i]) + 1);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            confdata->search[i] = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        }
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    }
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    for (i = 0 ; i < LWRES_CONFMAXSORTLIST ; i++) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        lwres_resetaddr(&confdata->sortlist[i].addr);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        lwres_resetaddr(&confdata->sortlist[i].mask);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    }
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    confdata->nsnext = 0;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    confdata->lwnext = 0;
c89ac488df58cf6a37918cd00236eedf015830f8Andreas Gustafsson    confdata->domainname = NULL;
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    confdata->searchnxt = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->sortlistnxt = 0;
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    confdata->resdebug = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->ndots = 1;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->no_tld_query = 0;
94e25967cda41b886e33ec254b917d21df21a187Bob Halley}
94e25967cda41b886e33ec254b917d21df21a187Bob Halley
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencestatic lwres_result_t
3740b569ae76295b941d57a724a43beb75b533baBob Halleylwres_conf_parsenameserver(lwres_context_t *ctx,  FILE *fp) {
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    char word[LWRES_CONFMAXLINELEN];
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    int res;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    lwres_conf_t *confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata = &ctx->confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (confdata->nsnext == LWRES_CONFMAXNAMESERVERS)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        return (LWRES_R_SUCCESS);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    res = getword(fp, word, sizeof(word));
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley    if (strlen(word) == 0)
94e25967cda41b886e33ec254b917d21df21a187Bob Halley        return (LWRES_R_FAILURE); /* Nothing on line. */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    else if (res == ' ' || res == '\t')
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley        res = eatwhite(fp);
4bed2e84a34b37259b85e5c092d51c122ef58c3cBob Halley
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    if (res != EOF && res != '\n')
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        return (LWRES_R_FAILURE); /* Extra junk on line. */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
94e25967cda41b886e33ec254b917d21df21a187Bob Halley    res = lwres_create_addr(word,
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence                &confdata->nameservers[confdata->nsnext++], 1);
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    if (res != LWRES_R_SUCCESS)
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence        return (res);
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    return (LWRES_R_SUCCESS);
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence}
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrencestatic lwres_result_t
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencelwres_conf_parselwserver(lwres_context_t *ctx,  FILE *fp) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    char word[LWRES_CONFMAXLINELEN];
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    int res;
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    lwres_conf_t *confdata;
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    confdata = &ctx->confdata;
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    if (confdata->lwnext == LWRES_CONFMAXLWSERVERS)
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence        return (LWRES_R_SUCCESS);
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    res = getword(fp, word, sizeof(word));
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (strlen(word) == 0)
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence        return (LWRES_R_FAILURE); /* Nothing on line. */
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence    else if (res == ' ' || res == '\t')
4ad9b25e6ddf948ffb3b8198c5540d251f26c52eDavid Lawrence        res = eatwhite(fp);
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence    if (res != EOF && res != '\n')
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence        return (LWRES_R_FAILURE); /* Extra junk on line. */
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    res = lwres_create_addr(word,
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence                &confdata->lwservers[confdata->lwnext++], 1);
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence    if (res != LWRES_R_SUCCESS)
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence        return (res);
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    return (LWRES_R_SUCCESS);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence}
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencestatic lwres_result_t
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrencelwres_conf_parsedomain(lwres_context_t *ctx,  FILE *fp) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    char word[LWRES_CONFMAXLINELEN];
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    int res, i;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    lwres_conf_t *confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata = &ctx->confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    res = getword(fp, word, sizeof(word));
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (strlen(word) == 0)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        return (LWRES_R_FAILURE); /* Nothing else on line. */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    else if (res == ' ' || res == '\t')
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        res = eatwhite(fp);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (res != EOF && res != '\n')
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        return (LWRES_R_FAILURE); /* Extra junk on line. */
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence    if (confdata->domainname != NULL)
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        CTXFREE(confdata->domainname,
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence            strlen(confdata->domainname) + 1); /*  */
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence    /*
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence     * Search and domain are mutually exclusive.
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence     */
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence    for (i = 0 ; i < LWRES_CONFMAXSEARCH ; i++) {
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence        if (confdata->search[i] != NULL) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            CTXFREE(confdata->search[i],
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence                strlen(confdata->search[i])+1);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence            confdata->search[i] = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        }
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    }
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->searchnxt = 0;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata->domainname = lwres_strdup(ctx, word);
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence    if (confdata->domainname == NULL)
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence        return (LWRES_R_FAILURE);
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrence
826c281a05cb89c9c28621937dc83fa676a5b207David Lawrence    return (LWRES_R_SUCCESS);
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrence}
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrence
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrencestatic lwres_result_t
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrencelwres_conf_parsesearch(lwres_context_t *ctx,  FILE *fp) {
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrence    int idx, delim;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    char word[LWRES_CONFMAXLINELEN];
604a596b5f97f09f6a4de67fe2f076d3c939df33David Lawrence    lwres_conf_t *confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    confdata = &ctx->confdata;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    if (confdata->domainname != NULL) {
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence        /*
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence         * Search and domain are mutually exclusive.
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence         */
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence        CTXFREE(confdata->domainname,
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence            strlen(confdata->domainname) + 1);
585529aaeb95a71cd3d95df2602a4688fc7c3292David Lawrence        confdata->domainname = NULL;
6fa1cb5754695d550a58c6e8978fda65f5146af7David Lawrence    }
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence    /*
114d0d1642b5ede0ab154532159fe38c30762d82David Lawrence     * Remove any previous search definitions.
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson     */
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson    for (idx = 0 ; idx < LWRES_CONFMAXSEARCH ; idx++) {
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson        if (confdata->search[idx] != NULL) {
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson            CTXFREE(confdata->search[idx],
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson                strlen(confdata->search[idx])+1);
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson            confdata->search[idx] = NULL;
6184f9fc1e65ef131ea308a1a92882595bb1aeeaAndreas Gustafsson        }
6184f9fc1e65ef131ea308a1a92882595bb1aeeaAndreas Gustafsson    }
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson    confdata->searchnxt = 0;
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson    delim = getword(fp, word, sizeof(word));
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson    if (strlen(word) == 0)
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson        return (LWRES_R_FAILURE); /* Nothing else on line. */
c8563aaf86c04f0e2284bcc8e444a0651c157ea0Andreas Gustafsson
    idx = 0;
    while (strlen(word) > 0) {
        if (confdata->searchnxt == LWRES_CONFMAXSEARCH)
            goto ignore; /* Too many domains. */

        confdata->search[idx] = lwres_strdup(ctx, word);
        if (confdata->search[idx] == NULL)
            return (LWRES_R_FAILURE);
        idx++;
        confdata->searchnxt++;

    ignore:
        if (delim == EOF || delim == '\n')
            break;
        else
            delim = getword(fp, word, sizeof(word));
    }

    return (LWRES_R_SUCCESS);
}

static lwres_result_t
lwres_create_addr(const char *buffer, lwres_addr_t *addr, int convert_zero) {
    struct in_addr v4;
    struct in6_addr v6;

    if (lwres_net_aton(buffer, &v4) == 1) {
        if (convert_zero) {
            unsigned char zeroaddress[] = {0, 0, 0, 0};
            unsigned char loopaddress[] = {127, 0, 0, 1};
            if (memcmp(&v4, zeroaddress, 4) == 0)
                memcpy(&v4, loopaddress, 4);
        }
        addr->family = LWRES_ADDRTYPE_V4;
        addr->length = NS_INADDRSZ;
        memcpy((void *)addr->address, &v4, NS_INADDRSZ);

    } else if (lwres_net_pton(AF_INET6, buffer, &v6) == 1) {
        addr->family = LWRES_ADDRTYPE_V6;
        addr->length = NS_IN6ADDRSZ;
        memcpy((void *)addr->address, &v6, NS_IN6ADDRSZ);
    } else {
        return (LWRES_R_FAILURE); /* Unrecognised format. */
    }

    return (LWRES_R_SUCCESS);
}

static lwres_result_t
lwres_conf_parsesortlist(lwres_context_t *ctx,  FILE *fp) {
    int delim, res, idx;
    char word[LWRES_CONFMAXLINELEN];
    char *p;
    lwres_conf_t *confdata;

    confdata = &ctx->confdata;

    delim = getword(fp, word, sizeof(word));
    if (strlen(word) == 0)
        return (LWRES_R_FAILURE); /* Empty line after keyword. */

    while (strlen(word) > 0) {
        if (confdata->sortlistnxt == LWRES_CONFMAXSORTLIST)
            return (LWRES_R_FAILURE); /* Too many values. */

        p = strchr(word, '/');
        if (p != NULL)
            *p++ = '\0';

        idx = confdata->sortlistnxt;
        res = lwres_create_addr(word, &confdata->sortlist[idx].addr, 1);
        if (res != LWRES_R_SUCCESS)
            return (res);

        if (p != NULL) {
            res = lwres_create_addr(p,
                        &confdata->sortlist[idx].mask,
                        0);
            if (res != LWRES_R_SUCCESS)
                return (res);
        } else {
            /*
             * Make up a mask.
             */
            confdata->sortlist[idx].mask =
                confdata->sortlist[idx].addr;

            memset(&confdata->sortlist[idx].mask.address, 0xff,
                   confdata->sortlist[idx].addr.length);
        }

        confdata->sortlistnxt++;

        if (delim == EOF || delim == '\n')
            break;
        else
            delim = getword(fp, word, sizeof(word));
    }

    return (LWRES_R_SUCCESS);
}

static lwres_result_t
lwres_conf_parseoption(lwres_context_t *ctx,  FILE *fp) {
    int delim;
    long ndots;
    char *p;
    char word[LWRES_CONFMAXLINELEN];
    lwres_conf_t *confdata;

    REQUIRE(ctx != NULL);
    confdata = &ctx->confdata;

    delim = getword(fp, word, sizeof(word));
    if (strlen(word) == 0)
        return (LWRES_R_FAILURE); /* Empty line after keyword. */

    while (strlen(word) > 0) {
        if (strcmp("debug", word) == 0) {
            confdata->resdebug = 1;
        } else if (strcmp("no_tld_query", word) == 0) {
            confdata->no_tld_query = 1;
        } else if (strncmp("ndots:", word, 6) == 0) {
            ndots = strtol(word + 6, &p, 10);
            if (*p != '\0') /* Bad string. */
                return (LWRES_R_FAILURE);
            if (ndots < 0 || ndots > 0xff) /* Out of range. */
                return (LWRES_R_FAILURE);
            confdata->ndots = (lwres_uint8_t)ndots;
        }

        if (delim == EOF || delim == '\n')
            break;
        else
            delim = getword(fp, word, sizeof(word));
    }

    return (LWRES_R_SUCCESS);
}

lwres_result_t
lwres_conf_parse(lwres_context_t *ctx, const char *filename) {
    FILE *fp = NULL;
    char word[256];
    lwres_result_t rval, ret;
    lwres_conf_t *confdata;
    int stopchar;

    REQUIRE(ctx != NULL);
    confdata = &ctx->confdata;

    REQUIRE(filename != NULL);
    REQUIRE(strlen(filename) > 0);
    REQUIRE(confdata != NULL);

    errno = 0;
    if ((fp = fopen(filename, "r")) == NULL)
        return (LWRES_R_FAILURE);

    ret = LWRES_R_SUCCESS;
    do {
        stopchar = getword(fp, word, sizeof(word));
        if (stopchar == EOF) {
            rval = LWRES_R_SUCCESS;
            break;
        }

        if (strlen(word) == 0)
            rval = LWRES_R_SUCCESS;
        else if (strcmp(word, "nameserver") == 0)
            rval = lwres_conf_parsenameserver(ctx, fp);
        else if (strcmp(word, "lwserver") == 0)
            rval = lwres_conf_parselwserver(ctx, fp);
        else if (strcmp(word, "domain") == 0)
            rval = lwres_conf_parsedomain(ctx, fp);
        else if (strcmp(word, "search") == 0)
            rval = lwres_conf_parsesearch(ctx, fp);
        else if (strcmp(word, "sortlist") == 0)
            rval = lwres_conf_parsesortlist(ctx, fp);
        else if (strcmp(word, "option") == 0)
            rval = lwres_conf_parseoption(ctx, fp);
        else {
            /* unrecognised word. Ignore entire line */
            rval = LWRES_R_SUCCESS;
            stopchar = eatline(fp);
            if (stopchar == EOF) {
                break;
            }
        }
        if (ret == LWRES_R_SUCCESS && rval != LWRES_R_SUCCESS)
            ret = rval;
    } while (1);

    fclose(fp);

    return (ret);
}

lwres_result_t
lwres_conf_print(lwres_context_t *ctx, FILE *fp) {
    int i;
    int af;
    char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
    const char *p;
    lwres_conf_t *confdata;
    lwres_addr_t tmpaddr;

    REQUIRE(ctx != NULL);
    confdata = &ctx->confdata;

    REQUIRE(confdata->nsnext <= LWRES_CONFMAXNAMESERVERS);

    for (i = 0 ; i < confdata->nsnext ; i++) {
        af = lwresaddr2af(confdata->nameservers[i].family);

        p = lwres_net_ntop(af, confdata->nameservers[i].address,
                   tmp, sizeof(tmp));
        if (p != tmp)
            return (LWRES_R_FAILURE);

        fprintf(fp, "nameserver %s\n", tmp);
    }

    for (i = 0 ; i < confdata->lwnext ; i++) {
        af = lwresaddr2af(confdata->lwservers[i].family);

        p = lwres_net_ntop(af, confdata->lwservers[i].address,
                   tmp, sizeof(tmp));
        if (p != tmp)
            return (LWRES_R_FAILURE);

        fprintf(fp, "lwserver %s\n", tmp);
    }

    if (confdata->domainname != NULL) {
        fprintf(fp, "domain %s\n", confdata->domainname);
    } else if (confdata->searchnxt > 0) {
        REQUIRE(confdata->searchnxt <= LWRES_CONFMAXSEARCH);

        fprintf(fp, "search");
        for (i = 0 ; i < confdata->searchnxt ; i++)
            fprintf(fp, " %s", confdata->search[i]);
        fputc('\n', fp);
    }

    REQUIRE(confdata->sortlistnxt <= LWRES_CONFMAXSORTLIST);

    if (confdata->sortlistnxt > 0) {
        fputs("sortlist", fp);
        for (i = 0 ; i < confdata->sortlistnxt ; i++) {
            af = lwresaddr2af(confdata->sortlist[i].addr.family);

            p = lwres_net_ntop(af,
                       confdata->sortlist[i].addr.address,
                       tmp, sizeof(tmp));
            if (p != tmp)
                return (LWRES_R_FAILURE);

            fprintf(fp, " %s", tmp);

            tmpaddr = confdata->sortlist[i].mask;
            memset(&tmpaddr.address, 0xff, tmpaddr.length);

            if (memcmp(&tmpaddr.address,
                   confdata->sortlist[i].mask.address,
                   confdata->sortlist[i].mask.length) != 0) {
                af = lwresaddr2af(
                        confdata->sortlist[i].mask.family);
                p = lwres_net_ntop
                    (af,
                     confdata->sortlist[i].mask.address,
                     tmp, sizeof(tmp));
                if (p != tmp)
                    return (LWRES_R_FAILURE);

                fprintf(fp, "/%s", tmp);
            }
        }
        fputc('\n', fp);
    }

    if (confdata->resdebug)
        fprintf(fp, "options debug\n");

    if (confdata->ndots > 0)
        fprintf(fp, "options ndots:%d\n", confdata->ndots);

    if (confdata->no_tld_query)
        fprintf(fp, "options no_tld_query\n");

    return (LWRES_R_SUCCESS);
}

lwres_conf_t *
lwres_conf_get(lwres_context_t *ctx) {
    REQUIRE(ctx != NULL);

    return (&ctx->confdata);
}