1 files changed, 678 insertions, 0 deletions

diff --git a/src/lib/libc/net/res_init.c b/src/lib/libc/net/res_init.c
new file mode 100644
index 0000000000..110542a404
--- /dev/null
+++ b/src/lib/libc/net/res_init.c
@@ -0,0 +1,678 @@
+/*      $OpenBSD: res_init.c,v 1.32 2005/03/30 02:58:28 tedu Exp $      */
+
+/*
+ * ++Copyright++ 1985, 1989, 1993
+ * -
+ * Copyright (c) 1985, 1989, 1993
+ *    The Regents of the University of California.  All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * -
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ * 
+ * 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, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION 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.
+ * -
+ * --Copyright--
+ */
+
+#ifndef INET6
+#define INET6
+#endif
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)res_init.c  8.1 (Berkeley) 6/7/93";
+static char rcsid[] = "$From: res_init.c,v 8.7 1996/09/28 06:51:07 vixie Exp $";
+#else
+static char rcsid[] = "$OpenBSD: res_init.c,v 1.32 2005/03/30 02:58:28 tedu Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+#include <stdio.h>
+#include <ctype.h>
+#include <resolv.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef INET6
+#include <netdb.h>
+#endif /* INET6 */
+
+#include "thread_private.h"
+
+/*-------------------------------------- info about "sortlist" --------------
+ * Marc Majka           1994/04/16
+ * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
+ *
+ * NetInfo resolver configuration directory support.
+ *
+ * Allow a NetInfo directory to be created in the hierarchy which
+ * contains the same information as the resolver configuration file.
+ *
+ * - The local domain name is stored as the value of the "domain" property.
+ * - The Internet address(es) of the name server(s) are stored as values
+ *   of the "nameserver" property.
+ * - The name server addresses are stored as values of the "nameserver"
+ *   property.
+ * - The search list for host-name lookup is stored as values of the
+ *   "search" property.
+ * - The sortlist comprised of IP address netmask pairs are stored as
+ *   values of the "sortlist" property. The IP address and optional netmask
+ *   should be separated by a slash (/) or ampersand (&) character.
+ * - Internal resolver variables can be set from the value of the "options"
+ *   property.
+ */
+
+static void res_setoptions(char *, char *);
+
+#ifdef RESOLVSORT
+static const char sort_mask[] = "/&";
+#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
+static u_int32_t net_mask(struct in_addr);
+#endif
+
+/*
+ * Resolver state default settings.
+ */
+void *__THREAD_NAME(_res);
+
+struct __res_state _res
+# if defined(__BIND_RES_TEXT)
+        = { RES_TIMEOUT, }      /* Motorola, et al. */
+# endif
+        ;
+#ifdef INET6
+void *__THREAD_NAME(_res_ext);
+
+struct __res_state_ext _res_ext;
+#endif /* INET6 */
+
+int __res_chktime = 30;
+
+/*
+ * Set up default settings.  If the configuration file exist, the values
+ * there will have precedence.  Otherwise, the server address is set to
+ * INADDR_ANY and the default domain name comes from the gethostname().
+ *
+ * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
+ * rather than INADDR_ANY ("0.0.0.0") as the default name server address
+ * since it was noted that INADDR_ANY actually meant ``the first interface
+ * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
+ * it had to be "up" in order for you to reach your own name server.  It
+ * was later decided that since the recommended practice is to always 
+ * install local static routes through 127.0.0.1 for all your network
+ * interfaces, that we could solve this problem without a code change.
+ *
+ * The configuration file should always be used, since it is the only way
+ * to specify a default domain.  If you are running a server on your local
+ * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
+ * in the configuration file.
+ *
+ * Return 0 if completes successfully, -1 on error
+ */
+int
+res_init(void)
+{
+
+        return (_res_init(1));
+}
+
+int
+_res_init(int usercall)
+{
+        struct stat sb;
+        struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
+#ifdef INET6
+        struct __res_state_ext *_res_extp = _THREAD_PRIVATE(_res_ext, _res_ext,
+                                                            &_res_ext);
+#endif
+        FILE *fp;
+        char *cp, **pp;
+        int n;
+        char buf[BUFSIZ];
+        int nserv = 0;    /* number of nameserver records read from file */
+        int haveenv = 0;
+        int havesearch = 0;
+        size_t len;
+#ifdef RESOLVSORT
+        int nsort = 0;
+        char *net;
+#endif
+#ifndef RFC1535
+        int dots;
+#endif
+
+        if (usercall == 0) {
+                if (_resp->options & RES_INIT &&
+                    _resp->reschktime >= time(NULL))
+                        return (0);
+                _resp->reschktime = time(NULL) + __res_chktime;
+                if (stat(_PATH_RESCONF, &sb) != -1) {
+                        if (timespeccmp(&sb.st_mtimespec,
+                            &_resp->restimespec, ==))
+                                return (0);
+                        else
+                                _resp->restimespec = sb.st_mtimespec;
+                } else {
+                        /*
+                         * Lost the file, in chroot?
+                         * Don' trash settings
+                         */
+                        if (timespecisset(&_resp->restimespec))
+                                return (0);
+                }
+        } else
+                _resp->reschktime = time(NULL) + __res_chktime;
+
+
+        /*
+         * These three fields used to be statically initialized.  This made
+         * it hard to use this code in a shared library.  It is necessary,
+         * now that we're doing dynamic initialization here, that we preserve
+         * the old semantics: if an application modifies one of these three
+         * fields of _res before res_init() is called, res_init() will not
+         * alter them.  Of course, if an application is setting them to
+         * _zero_ before calling res_init(), hoping to override what used
+         * to be the static default, we can't detect it and unexpected results
+         * will follow.  Zero for any of these fields would make no sense,
+         * so one can safely assume that the applications were already getting
+         * unexpected results.
+         *
+         * _res.options is tricky since some apps were known to diddle the bits
+         * before res_init() was first called. We can't replicate that semantic
+         * with dynamic initialization (they may have turned bits off that are
+         * set in RES_DEFAULT).  Our solution is to declare such applications
+         * "broken".  They could fool us by setting RES_INIT but none do (yet).
+         */
+        if (!_resp->retrans)
+                _resp->retrans = RES_TIMEOUT;
+        if (!_resp->retry)
+                _resp->retry = 4;
+        if (!(_resp->options & RES_INIT))
+                _resp->options = RES_DEFAULT;
+
+#ifdef USELOOPBACK
+        _resp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
+#else
+        _resp->nsaddr.sin_addr.s_addr = INADDR_ANY;
+#endif
+        _resp->nsaddr.sin_family = AF_INET;
+        _resp->nsaddr.sin_port = htons(NAMESERVER_PORT);
+        _resp->nsaddr.sin_len = sizeof(struct sockaddr_in);
+#ifdef INET6
+        if (sizeof(_res_extp->nsaddr) >= _resp->nsaddr.sin_len)
+                memcpy(&_res_extp->nsaddr, &_resp->nsaddr, _resp->nsaddr.sin_len);
+#endif
+        _resp->nscount = 1;
+        _resp->ndots = 1;
+        _resp->pfcode = 0;
+        strlcpy(_resp->lookups, "f", sizeof _resp->lookups);
+
+        /* Allow user to override the local domain definition */
+        if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
+                strlcpy(_resp->defdname, cp, sizeof(_resp->defdname));
+                haveenv++;
+
+                /*
+                 * Set search list to be blank-separated strings
+                 * from rest of env value.  Permits users of LOCALDOMAIN
+                 * to still have a search list, and anyone to set the
+                 * one that they want to use as an individual (even more
+                 * important now that the rfc1535 stuff restricts searches)
+                 */
+                cp = _resp->defdname;
+                pp = _resp->dnsrch;
+                *pp++ = cp;
+                for (n = 0; *cp && pp < _resp->dnsrch + MAXDNSRCH; cp++) {
+                        if (*cp == '\n')        /* silly backwards compat */
+                                break;
+                        else if (*cp == ' ' || *cp == '\t') {
+                                *cp = 0;
+                                n = 1;
+                        } else if (n) {
+                                *pp++ = cp;
+                                n = 0;
+                                havesearch = 1;
+                        }
+                }
+                /* null terminate last domain if there are excess */
+                while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
+                        cp++;
+                *cp = '\0';
+                *pp++ = 0;
+        }
+
+#define MATCH(line, name) \
+        (!strncmp(line, name, sizeof(name) - 1) && \
+        (line[sizeof(name) - 1] == ' ' || \
+         line[sizeof(name) - 1] == '\t'))
+
+        if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
+            strlcpy(_resp->lookups, "bf", sizeof _resp->lookups);
+
+            /* read the config file */
+            buf[0] = '\0';
+            while ((cp = fgetln(fp, &len)) != NULL) {
+                /* skip lines that are too long or zero length */
+                if (len >= sizeof(buf) || len == 0)
+                    continue;
+                (void)memcpy(buf, cp, len);
+                buf[len] = '\0';
+                /* skip comments */
+                if ((cp = strpbrk(buf, ";#")) != NULL)
+                        *cp = '\0';
+                if (buf[0] == '\0')
+                        continue;
+                /* read default domain name */
+                if (MATCH(buf, "domain")) {
+                    if (haveenv)        /* skip if have from environ */
+                            continue;
+                    cp = buf + sizeof("domain") - 1;
+                    while (*cp == ' ' || *cp == '\t')
+                            cp++;
+                    if ((*cp == '\0') || (*cp == '\n'))
+                            continue;
+                    strlcpy(_resp->defdname, cp, sizeof(_resp->defdname));
+                    if ((cp = strpbrk(_resp->defdname, " \t\n")) != NULL)
+                            *cp = '\0';
+                    havesearch = 0;
+                    continue;
+                }
+                /* lookup types */
+                if (MATCH(buf, "lookup")) {
+                    char *sp = NULL;
+
+                    bzero(_resp->lookups, sizeof _resp->lookups);
+                    cp = buf + sizeof("lookup") - 1;
+                    for (n = 0;; cp++) {
+                            if (n == MAXDNSLUS)
+                                    break;
+                            if ((*cp == '\0') || (*cp == '\n')) {
+                                    if (sp) {
+                                            if (*sp=='y' || *sp=='b' || *sp=='f')
+                                                    _resp->lookups[n++] = *sp;
+                                            sp = NULL;
+                                    }
+                                    break;
+                            } else if ((*cp == ' ') || (*cp == '\t') || (*cp == ',')) {
+                                    if (sp) {
+                                            if (*sp=='y' || *sp=='b' || *sp=='f')
+                                                    _resp->lookups[n++] = *sp;
+                                            sp = NULL;
+                                    }
+                            } else if (sp == NULL)
+                                    sp = cp;
+                    }
+                    continue;
+                }
+                /* set search list */
+                if (MATCH(buf, "search")) {
+                    if (haveenv)        /* skip if have from environ */
+                            continue;
+                    cp = buf + sizeof("search") - 1;
+                    while (*cp == ' ' || *cp == '\t')
+                            cp++;
+                    if ((*cp == '\0') || (*cp == '\n'))
+                            continue;
+                    strlcpy(_resp->defdname, cp, sizeof(_resp->defdname));
+                    if ((cp = strchr(_resp->defdname, '\n')) != NULL)
+                            *cp = '\0';
+                    /*
+                     * Set search list to be blank-separated strings
+                     * on rest of line.
+                     */
+                    cp = _resp->defdname;
+                    pp = _resp->dnsrch;
+                    *pp++ = cp;
+                    for (n = 0; *cp && pp < _resp->dnsrch + MAXDNSRCH; cp++) {
+                            if (*cp == ' ' || *cp == '\t') {
+                                    *cp = 0;
+                                    n = 1;
+                            } else if (n) {
+                                    *pp++ = cp;
+                                    n = 0;
+                            }
+                    }
+                    /* null terminate last domain if there are excess */
+                    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
+                            cp++;
+                    *cp = '\0';
+                    *pp++ = 0;
+                    havesearch = 1;
+                    continue;
+                }
+                /* read nameservers to query */
+                if (MATCH(buf, "nameserver") && nserv < MAXNS) {
+#ifdef INET6
+                    char *q;
+                    struct addrinfo hints, *res;
+                    char pbuf[NI_MAXSERV];
+#else
+                    struct in_addr a;
+#endif /* INET6 */
+
+                    cp = buf + sizeof("nameserver") - 1;
+                    while (*cp == ' ' || *cp == '\t')
+                        cp++;
+#ifdef INET6
+                    if ((*cp == '\0') || (*cp == '\n'))
+                        continue;
+                    for (q = cp; *q; q++) {
+                        if (isspace(*q)) {
+                            *q = '\0';
+                            break;
+                        }
+                    }
+                    memset(&hints, 0, sizeof(hints));
+                    hints.ai_flags = AI_NUMERICHOST;
+                    hints.ai_socktype = SOCK_DGRAM;
+                    snprintf(pbuf, sizeof(pbuf), "%u", NAMESERVER_PORT);
+                    res = NULL;
+                    if (getaddrinfo(cp, pbuf, &hints, &res) == 0 &&
+                            res->ai_next == NULL) {
+                        if (res->ai_addrlen <= sizeof(_res_extp->nsaddr_list[nserv])) {
+                            memcpy(&_res_extp->nsaddr_list[nserv], res->ai_addr,
+                                res->ai_addrlen);
+                        } else {
+                            memset(&_res_extp->nsaddr_list[nserv], 0,
+                                sizeof(_res_extp->nsaddr_list[nserv]));
+                        }
+                        if (res->ai_addrlen <= sizeof(_resp->nsaddr_list[nserv])) {
+                            memcpy(&_resp->nsaddr_list[nserv], res->ai_addr,
+                                res->ai_addrlen);
+                        } else {
+                            memset(&_resp->nsaddr_list[nserv], 0,
+                                sizeof(_resp->nsaddr_list[nserv]));
+                        }
+                        nserv++;
+                    }
+                    if (res)
+                        freeaddrinfo(res);
+#else /* INET6 */
+                    if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
+                        _resp->nsaddr_list[nserv].sin_addr = a;
+                        _resp->nsaddr_list[nserv].sin_family = AF_INET;
+                        _resp->nsaddr_list[nserv].sin_port =
+                                htons(NAMESERVER_PORT);
+                        _resp->nsaddr_list[nserv].sin_len =
+                                sizeof(struct sockaddr_in);
+                        nserv++;
+                    }
+#endif /* INET6 */
+                    continue;
+                }
+#ifdef RESOLVSORT
+                if (MATCH(buf, "sortlist")) {
+                    struct in_addr a;
+#ifdef INET6
+                    struct in6_addr a6;
+                    int m, i;
+                    u_char *u;
+#endif /* INET6 */
+
+                    cp = buf + sizeof("sortlist") - 1;
+                    while (nsort < MAXRESOLVSORT) {
+                        while (*cp == ' ' || *cp == '\t')
+                            cp++;
+                        if (*cp == '\0' || *cp == '\n' || *cp == ';')
+                            break;
+                        net = cp;
+                        while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
+                               isascii(*cp) && !isspace(*cp))
+                                cp++;
+                        n = *cp;
+                        *cp = 0;
+                        if (inet_aton(net, &a)) {
+                            _resp->sort_list[nsort].addr = a;
+                            if (ISSORTMASK(n)) {
+                                *cp++ = n;
+                                net = cp;
+                                while (*cp && *cp != ';' &&
+                                        isascii(*cp) && !isspace(*cp))
+                                    cp++;
+                                n = *cp;
+                                *cp = 0;
+                                if (inet_aton(net, &a)) {
+                                    _resp->sort_list[nsort].mask = a.s_addr;
+                                } else {
+                                    _resp->sort_list[nsort].mask = 
+                                        net_mask(_resp->sort_list[nsort].addr);
+                                }
+                            } else {
+                                _resp->sort_list[nsort].mask = 
+                                    net_mask(_resp->sort_list[nsort].addr);
+                            }
+#ifdef INET6
+                            _res_extp->sort_list[nsort].af = AF_INET;
+                            _res_extp->sort_list[nsort].addr.ina =
+                                _resp->sort_list[nsort].addr;
+                            _res_extp->sort_list[nsort].mask.ina.s_addr =
+                                _resp->sort_list[nsort].mask;
+#endif /* INET6 */
+                            nsort++;
+                        }
+#ifdef INET6
+                        else if (inet_pton(AF_INET6, net, &a6) == 1) {
+                            _res_extp->sort_list[nsort].af = AF_INET6;
+                            _res_extp->sort_list[nsort].addr.in6a = a6;
+                            u = (u_char *)&_res_extp->sort_list[nsort].mask.in6a;
+                            *cp++ = n;
+                            net = cp;
+                            while (*cp && *cp != ';' &&
+                                    isascii(*cp) && !isspace(*cp))
+                                cp++;
+                            m = n;
+                            n = *cp;
+                            *cp = 0;
+                            switch (m) {
+                            case '/':
+                                m = atoi(net);
+                                break;
+                            case '&':
+                                if (inet_pton(AF_INET6, net, u) == 1) {
+                                    m = -1;
+                                    break;
+                                }
+                                /*FALLTHRU*/
+                            default:
+                                m = sizeof(struct in6_addr) * NBBY;
+                                break;
+                            }
+                            if (m >= 0) {
+                                for (i = 0; i < sizeof(struct in6_addr); i++) {
+                                    if (m <= 0) {
+                                        *u = 0;
+                                    } else {
+                                        m -= NBBY;
+                                        *u = (u_char)~0;
+                                        if (m < 0)
+                                            *u <<= -m;
+                                    }
+                                    u++;
+                                }
+                            }
+                            nsort++;
+                        }
+#endif /* INET6 */
+                        *cp = n;
+                    }
+                    continue;
+                }
+#endif
+                if (MATCH(buf, "options")) {
+                    res_setoptions(buf + sizeof("options") - 1, "conf");
+                    continue;
+                }
+            }
+            if (nserv > 1) 
+                _resp->nscount = nserv;
+#ifdef RESOLVSORT
+            _resp->nsort = nsort;
+#endif
+            (void) fclose(fp);
+        }
+        if (_resp->defdname[0] == 0 &&
+            gethostname(buf, sizeof(_resp->defdname) - 1) == 0 &&
+            (cp = strchr(buf, '.')) != NULL)
+        {
+                strlcpy(_resp->defdname, cp + 1,
+                        sizeof(_resp->defdname));
+        }
+
+        /* find components of local domain that might be searched */
+        if (havesearch == 0) {
+                pp = _resp->dnsrch;
+                *pp++ = _resp->defdname;
+                *pp = NULL;
+
+#ifndef RFC1535
+                dots = 0;
+                for (cp = _resp->defdname; *cp; cp++)
+                        dots += (*cp == '.');
+
+                cp = _resp->defdname;
+                while (pp < _resp->dnsrch + MAXDFLSRCH) {
+                        if (dots < LOCALDOMAINPARTS)
+                                break;
+                        cp = strchr(cp, '.') + 1;    /* we know there is one */
+                        *pp++ = cp;
+                        dots--;
+                }
+                *pp = NULL;
+#ifdef DEBUG
+                if (_resp->options & RES_DEBUG) {
+                        printf(";; res_init()... default dnsrch list:\n");
+                        for (pp = _resp->dnsrch; *pp; pp++)
+                                printf(";;\t%s\n", *pp);
+                        printf(";;\t..END..\n");
+                }
+#endif /* DEBUG */
+#endif /* !RFC1535 */
+        }
+
+        if (issetugid())
+                _resp->options |= RES_NOALIASES;
+        else if ((cp = getenv("RES_OPTIONS")) != NULL)
+                res_setoptions(cp, "env");
+        _resp->options |= RES_INIT;
+        return (0);
+}
+
+/* ARGSUSED */
+static void
+res_setoptions(char *options, char *source)
+{
+        struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
+        char *cp = options;
+        char *endp;
+        long l;
+
+#ifdef DEBUG
+        if (_resp->options & RES_DEBUG)
+                printf(";; res_setoptions(\"%s\", \"%s\")...\n",
+                       options, source);
+#endif
+        while (*cp) {
+                /* skip leading and inner runs of spaces */
+                while (*cp == ' ' || *cp == '\t')
+                        cp++;
+                /* search for and process individual options */
+                if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
+                        char *p = cp + sizeof("ndots:") - 1;
+                        l = strtol(p, &endp, 10);
+                        if (l >= 0 && endp != p &&
+                            (*endp = '\0' || isspace(*endp))) {
+                                if (l <= RES_MAXNDOTS)
+                                        _resp->ndots = l;
+                                else
+                                        _resp->ndots = RES_MAXNDOTS;
+#ifdef DEBUG
+                                if (_resp->options & RES_DEBUG)
+                                        printf(";;\tndots=%u\n", _resp->ndots);
+#endif
+                        }
+                } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
+#ifdef DEBUG
+                        if (!(_resp->options & RES_DEBUG)) {
+                                printf(";; res_setoptions(\"%s\", \"%s\")..\n",
+                                       options, source);
+                                _resp->options |= RES_DEBUG;
+                        }
+                        printf(";;\tdebug\n");
+#endif
+                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
+                        _resp->options |= RES_USE_INET6;
+                } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
+                        _resp->options |= RES_INSECURE1;
+                } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
+                        _resp->options |= RES_INSECURE2;
+                } else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
+                        _resp->options |= RES_USE_EDNS0;
+                } else {
+                        /* XXX - print a warning here? */
+                }
+                /* skip to next run of spaces */
+                while (*cp && *cp != ' ' && *cp != '\t')
+                        cp++;
+        }
+}
+
+#ifdef RESOLVSORT
+/* XXX - should really support CIDR which means explicit masks always. */
+static u_int32_t
+net_mask(struct in_addr in)     /* XXX - should really use system's version of this */
+{
+        u_int32_t i = ntohl(in.s_addr);
+
+        if (IN_CLASSA(i))
+                return (htonl(IN_CLASSA_NET));
+        else if (IN_CLASSB(i))
+                return (htonl(IN_CLASSB_NET));
+        return (htonl(IN_CLASSC_NET));
+}
+#endif