diff options
Diffstat (limited to 'lib/libc/net/gethostbydns.c')
| -rw-r--r-- | lib/libc/net/gethostbydns.c | 779 |
1 files changed, 0 insertions, 779 deletions
diff --git a/lib/libc/net/gethostbydns.c b/lib/libc/net/gethostbydns.c deleted file mode 100644 index f301c88..0000000 --- a/lib/libc/net/gethostbydns.c +++ /dev/null @@ -1,779 +0,0 @@ -/* - * ++Copyright++ 1985, 1988, 1993 - * - - * Copyright (c) 1985, 1988, 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. - * 4. 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-- - */ - -#if defined(LIBC_SCCS) && !defined(lint) -static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; -static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $"; -#endif /* LIBC_SCCS and not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/types.h> -#include <sys/param.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <arpa/nameser.h> - -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <netdb.h> -#include <resolv.h> -#include <ctype.h> -#include <errno.h> -#include <syslog.h> -#include <stdarg.h> -#include <nsswitch.h> - -#include "netdb_private.h" -#include "res_config.h" - -#define SPRINTF(x) ((size_t)sprintf x) - -static const char AskedForGot[] = - "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; - -#ifdef RESOLVSORT -static void addrsort(char **, int, res_state); -#endif - -#ifdef DEBUG -static void dprintf(char *, int, res_state) __printflike(1, 0); -#endif - -#define MAXPACKET (64*1024) - -typedef union { - HEADER hdr; - u_char buf[MAXPACKET]; -} querybuf; - -typedef union { - int32_t al; - char ac; -} align; - -int _dns_ttl_; - -#ifdef DEBUG -static void -dprintf(msg, num, res) - char *msg; - int num; - res_state res; -{ - if (res->options & RES_DEBUG) { - int save = errno; - - printf(msg, num); - errno = save; - } -} -#else -# define dprintf(msg, num, res) /*nada*/ -#endif - -#define BOUNDED_INCR(x) \ - do { \ - cp += x; \ - if (cp > eom) { \ - RES_SET_H_ERRNO(statp, NO_RECOVERY); \ - return (-1); \ - } \ - } while (0) - -#define BOUNDS_CHECK(ptr, count) \ - do { \ - if ((ptr) + (count) > eom) { \ - RES_SET_H_ERRNO(statp, NO_RECOVERY); \ - return (-1); \ - } \ - } while (0) - -static int -gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype, - struct hostent *he, struct hostent_data *hed, res_state statp) -{ - const HEADER *hp; - const u_char *cp; - int n; - const u_char *eom, *erdata; - char *bp, *ep, **ap, **hap; - int type, class, ancount, qdcount; - int haveanswer, had_error; - int toobig = 0; - char tbuf[MAXDNAME]; - const char *tname; - int (*name_ok)(const char *); - - tname = qname; - he->h_name = NULL; - eom = answer->buf + anslen; - switch (qtype) { - case T_A: - case T_AAAA: - name_ok = res_hnok; - break; - case T_PTR: - name_ok = res_dnok; - break; - default: - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); /* XXX should be abort(); */ - } - /* - * find first satisfactory answer - */ - hp = &answer->hdr; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - bp = hed->hostbuf; - ep = hed->hostbuf + sizeof hed->hostbuf; - cp = answer->buf; - BOUNDED_INCR(HFIXEDSZ); - if (qdcount != 1) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !(*name_ok)(bp)) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - BOUNDED_INCR(n + QFIXEDSZ); - if (qtype == T_A || qtype == T_AAAA) { - /* res_send() has already verified that the query name is the - * same as the one we sent; this just gets the expanded name - * (i.e., with the succeeding search-domain tacked on). - */ - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - he->h_name = bp; - bp += n; - /* The qname can be abbreviated, but h_name is now absolute. */ - qname = he->h_name; - } - ap = hed->host_aliases; - *ap = NULL; - he->h_aliases = hed->host_aliases; - hap = hed->h_addr_ptrs; - *hap = NULL; - he->h_addr_list = hed->h_addr_ptrs; - haveanswer = 0; - had_error = 0; - _dns_ttl_ = -1; - while (ancount-- > 0 && cp < eom && !had_error) { - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !(*name_ok)(bp)) { - had_error++; - continue; - } - cp += n; /* name */ - BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); - type = _getshort(cp); - cp += INT16SZ; /* type */ - class = _getshort(cp); - cp += INT16SZ; /* class */ - if (qtype == T_A && type == T_A) - _dns_ttl_ = _getlong(cp); - cp += INT32SZ; /* TTL */ - n = _getshort(cp); - cp += INT16SZ; /* len */ - BOUNDS_CHECK(cp, n); - erdata = cp + n; - if (class != C_IN) { - /* XXX - debug? syslog? */ - cp += n; - continue; /* XXX - had_error++ ? */ - } - if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { - if (ap >= &hed->host_aliases[_MAXALIASES-1]) - continue; - n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); - if ((n < 0) || !(*name_ok)(tbuf)) { - had_error++; - continue; - } - cp += n; - if (cp != erdata) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - /* Store alias. */ - *ap++ = bp; - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - bp += n; - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strcpy(bp, tbuf); - he->h_name = bp; - bp += n; - continue; - } - if (qtype == T_PTR && type == T_CNAME) { - n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); - if (n < 0 || !res_dnok(tbuf)) { - had_error++; - continue; - } - cp += n; - if (cp != erdata) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strcpy(bp, tbuf); - tname = bp; - bp += n; - continue; - } - if (type != qtype) { - if (type != T_SIG && type != ns_t_dname) - syslog(LOG_NOTICE|LOG_AUTH, - "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", - qname, p_class(C_IN), p_type(qtype), - p_type(type)); - cp += n; - continue; /* XXX - had_error++ ? */ - } - switch (type) { - case T_PTR: - if (strcasecmp(tname, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, qname, bp); - cp += n; - continue; /* XXX - had_error++ ? */ - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !res_hnok(bp)) { - had_error++; - break; - } -#if MULTI_PTRS_ARE_ALIASES - cp += n; - if (cp != erdata) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - if (!haveanswer) - he->h_name = bp; - else if (ap < &hed->host_aliases[_MAXALIASES-1]) - *ap++ = bp; - else - n = -1; - if (n != -1) { - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - break; - } - bp += n; - } - break; -#else - he->h_name = bp; - if (statp->options & RES_USE_INET6) { - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - break; - } - bp += n; - _map_v4v6_hostent(he, &bp, ep); - } - RES_SET_H_ERRNO(statp, NETDB_SUCCESS); - return (0); -#endif - case T_A: - case T_AAAA: - if (strcasecmp(he->h_name, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, he->h_name, bp); - cp += n; - continue; /* XXX - had_error++ ? */ - } - if (n != he->h_length) { - cp += n; - continue; - } - if (!haveanswer) { - int nn; - - he->h_name = bp; - nn = strlen(bp) + 1; /* for the \0 */ - bp += nn; - } - - bp += sizeof(align) - ((u_long)bp % sizeof(align)); - - if (bp + n >= ep) { - dprintf("size (%d) too big\n", n, statp); - had_error++; - continue; - } - if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) { - if (!toobig++) - dprintf("Too many addresses (%d)\n", - _MAXADDRS, statp); - cp += n; - continue; - } - memcpy(*hap++ = bp, cp, n); - bp += n; - cp += n; - if (cp != erdata) { - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - } - break; - default: - dprintf("Impossible condition (type=%d)\n", type, - statp); - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); - /* BIND has abort() here, too risky on bad data */ - } - if (!had_error) - haveanswer++; - } - if (haveanswer) { - *ap = NULL; - *hap = NULL; -# if defined(RESOLVSORT) - /* - * Note: we sort even if host can take only one address - * in its return structures - should give it the "best" - * address in that case, not some random one - */ - if (statp->nsort && haveanswer > 1 && qtype == T_A) - addrsort(hed->h_addr_ptrs, haveanswer, statp); -# endif /*RESOLVSORT*/ - if (!he->h_name) { - n = strlen(qname) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) - goto no_recovery; - strcpy(bp, qname); - he->h_name = bp; - bp += n; - } - if (statp->options & RES_USE_INET6) - _map_v4v6_hostent(he, &bp, ep); - RES_SET_H_ERRNO(statp, NETDB_SUCCESS); - return (0); - } - no_recovery: - RES_SET_H_ERRNO(statp, NO_RECOVERY); - return (-1); -} - -/* XXX: for async DNS resolver in ypserv */ -struct hostent * -__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype) -{ - struct hostent *he; - struct hostent_data *hed; - int error; - res_state statp; - - statp = __res_state(); - if ((he = __hostent_init()) == NULL || - (hed = __hostent_data_init()) == NULL) { - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - return (NULL); - } - switch (qtype) { - case T_AAAA: - he->h_addrtype = AF_INET6; - he->h_length = NS_IN6ADDRSZ; - break; - case T_A: - default: - he->h_addrtype = AF_INET; - he->h_length = NS_INADDRSZ; - break; - } - - error = gethostanswer((const querybuf *)answer, anslen, qname, qtype, - he, hed, statp); - return (error == 0) ? he : NULL; -} - -int -_dns_gethostbyname(void *rval, void *cb_data, va_list ap) -{ - const char *name; - int af; - char *buffer; - size_t buflen; - int *errnop, *h_errnop; - struct hostent *hptr, he; - struct hostent_data *hed; - querybuf *buf; - int n, type, error; - res_state statp; - - name = va_arg(ap, const char *); - af = va_arg(ap, int); - hptr = va_arg(ap, struct hostent *); - buffer = va_arg(ap, char *); - buflen = va_arg(ap, size_t); - errnop = va_arg(ap, int *); - h_errnop = va_arg(ap, int *); - - *((struct hostent **)rval) = NULL; - - statp = __res_state(); - if ((hed = __hostent_data_init()) == NULL) { - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } - - he.h_addrtype = af; - switch (af) { - case AF_INET: - he.h_length = NS_INADDRSZ; - type = T_A; - break; - case AF_INET6: - he.h_length = NS_IN6ADDRSZ; - type = T_AAAA; - break; - default: - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - errno = EAFNOSUPPORT; - return (NS_UNAVAIL); - } - - if ((buf = malloc(sizeof(*buf))) == NULL) { - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } - n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf)); - if (n < 0) { - free(buf); - dprintf("res_nsearch failed (%d)\n", n, statp); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } else if (n > sizeof(buf->buf)) { - free(buf); - dprintf("static buffer is too small (%d)\n", n, statp); - *h_errnop = statp->res_h_errno; - return (NS_UNAVAIL); - } - error = gethostanswer(buf, n, name, type, &he, hed, statp); - free(buf); - if (error != 0) { - *h_errnop = statp->res_h_errno; - switch (statp->res_h_errno) { - case HOST_NOT_FOUND: - return (NS_NOTFOUND); - case TRY_AGAIN: - return (NS_TRYAGAIN); - default: - return (NS_UNAVAIL); - } - /*NOTREACHED*/ - } - if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { - *errnop = errno; - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return (NS_RETURN); - } - RES_SET_H_ERRNO(statp, NETDB_SUCCESS); - *((struct hostent **)rval) = hptr; - return (NS_SUCCESS); -} - -int -_dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) -{ - const void *addr; - socklen_t len; - int af; - char *buffer; - size_t buflen; - int *errnop, *h_errnop; - const u_char *uaddr; - struct hostent *hptr, he; - struct hostent_data *hed; - int n; - querybuf *buf; - char qbuf[MAXDNAME+1], *qp; - res_state statp; -#ifdef SUNSECURITY - struct hostdata rhd; - struct hostent *rhe; - char **haddr; - u_long old_options; - char hname2[MAXDNAME+1], numaddr[46]; - int ret_h_error; -#endif /*SUNSECURITY*/ - - addr = va_arg(ap, const void *); - len = va_arg(ap, socklen_t); - af = va_arg(ap, int); - hptr = va_arg(ap, struct hostent *); - buffer = va_arg(ap, char *); - buflen = va_arg(ap, size_t); - errnop = va_arg(ap, int *); - h_errnop = va_arg(ap, int *); - uaddr = (const u_char *)addr; - - *((struct hostent **)rval) = NULL; - - statp = __res_state(); - if ((hed = __hostent_data_init()) == NULL) { - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } - - switch (af) { - case AF_INET: - (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", - (uaddr[3] & 0xff), - (uaddr[2] & 0xff), - (uaddr[1] & 0xff), - (uaddr[0] & 0xff)); - break; - case AF_INET6: - qp = qbuf; - for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { - qp += SPRINTF((qp, "%x.%x.", - uaddr[n] & 0xf, - (uaddr[n] >> 4) & 0xf)); - } - strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); - break; - default: - abort(); - } - if ((buf = malloc(sizeof(*buf))) == NULL) { - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return NS_NOTFOUND; - } - n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, - sizeof buf->buf); - if (n < 0) { - free(buf); - dprintf("res_nquery failed (%d)\n", n, statp); - *h_errnop = statp->res_h_errno; - return (NS_UNAVAIL); - } - if (n > sizeof buf->buf) { - free(buf); - dprintf("static buffer is too small (%d)\n", n, statp); - *h_errnop = statp->res_h_errno; - return (NS_UNAVAIL); - } - if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { - free(buf); - *h_errnop = statp->res_h_errno; - switch (statp->res_h_errno) { - case HOST_NOT_FOUND: - return (NS_NOTFOUND); - case TRY_AGAIN: - return (NS_TRYAGAIN); - default: - return (NS_UNAVAIL); - } - /*NOTREACHED*/ - } - free(buf); -#ifdef SUNSECURITY - if (af == AF_INET) { - /* - * turn off search as the name should be absolute, - * 'localhost' should be matched by defnames - */ - strncpy(hname2, he.h_name, MAXDNAME); - hname2[MAXDNAME] = '\0'; - old_options = statp->options; - statp->options &= ~RES_DNSRCH; - statp->options |= RES_DEFNAMES; - memset(&rhd, 0, sizeof rhd); - rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, - sizeof(rhd.data), &ret_h_error); - if (rhe == NULL) { - if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) - strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); - syslog(LOG_NOTICE|LOG_AUTH, - "gethostbyaddr: No A record for %s (verifying [%s])", - hname2, numaddr); - statp->options = old_options; - RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } - statp->options = old_options; - for (haddr = rhe->h_addr_list; *haddr; haddr++) - if (!memcmp(*haddr, addr, NS_INADDRSZ)) - break; - if (!*haddr) { - if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) - strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); - syslog(LOG_NOTICE|LOG_AUTH, - "gethostbyaddr: A record of %s != PTR record [%s]", - hname2, numaddr); - RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); - *h_errnop = statp->res_h_errno; - return (NS_NOTFOUND); - } - } -#endif /*SUNSECURITY*/ - he.h_addrtype = af; - he.h_length = len; - memcpy(hed->host_addr, uaddr, len); - hed->h_addr_ptrs[0] = (char *)hed->host_addr; - hed->h_addr_ptrs[1] = NULL; - if (af == AF_INET && (statp->options & RES_USE_INET6)) { - _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); - he.h_addrtype = AF_INET6; - he.h_length = NS_IN6ADDRSZ; - } - if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { - *errnop = errno; - RES_SET_H_ERRNO(statp, NETDB_INTERNAL); - *h_errnop = statp->res_h_errno; - return (NS_RETURN); - } - RES_SET_H_ERRNO(statp, NETDB_SUCCESS); - *((struct hostent **)rval) = hptr; - return (NS_SUCCESS); -} - -#ifdef RESOLVSORT -static void -addrsort(char **ap, int num, res_state res) -{ - int i, j; - char **p; - short aval[_MAXADDRS]; - int needsort = 0; - - p = ap; - for (i = 0; i < num; i++, p++) { - for (j = 0 ; (unsigned)j < res->nsort; j++) - if (res->sort_list[j].addr.s_addr == - (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) - break; - aval[i] = j; - if (needsort == 0 && i > 0 && j < aval[i-1]) - needsort = i; - } - if (!needsort) - return; - - while (needsort < num) { - for (j = needsort - 1; j >= 0; j--) { - if (aval[j] > aval[j+1]) { - char *hp; - - i = aval[j]; - aval[j] = aval[j+1]; - aval[j+1] = i; - - hp = ap[j]; - ap[j] = ap[j+1]; - ap[j+1] = hp; - - } else - break; - } - needsort++; - } -} -#endif - -void -_sethostdnsent(int stayopen) -{ - res_state statp; - - statp = __res_state(); - if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) - return; - if (stayopen) - statp->options |= RES_STAYOPEN | RES_USEVC; -} - -void -_endhostdnsent() -{ - res_state statp; - - statp = __res_state(); - statp->options &= ~(RES_STAYOPEN | RES_USEVC); - res_nclose(statp); -} |
