Initial Contribution
diff --git a/libc/netbsd/resolv/res_send.c b/libc/netbsd/resolv/res_send.c
new file mode 100644
index 0000000..24b740a
--- /dev/null
+++ b/libc/netbsd/resolv/res_send.c
@@ -0,0 +1,1136 @@
+/* $NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $ */
+
+/*
+ * Copyright 2008 Android Open Source Project (source port randomization)
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 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 (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * 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 ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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 <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#ifdef notdef
+static const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
+static const char rcsid[] = "Id: res_send.c,v 1.5.2.2.4.5 2004/08/10 02:19:56 marka Exp";
+#else
+__RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Send query to name server and wait for reply.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <netinet/in.h>
+#include <netinet/in6.h>
+#include "arpa_nameser.h"
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <netdb.h>
+#ifdef ANDROID_CHANGES
+#include "resolv_private.h"
+#else
+#include <resolv.h>
+#endif
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <isc/eventlib.h>
+
+#ifndef DE_CONST
+#define DE_CONST(c,v) v = ((c) ? \
+ strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL)
+#endif
+
+/* Options. Leave them on. */
+#ifndef DEBUG
+#define DEBUG
+#endif
+#include "res_debug.h"
+#include "res_private.h"
+
+#define EXT(res) ((res)->_u._ext)
+
+static const int highestFD = FD_SETSIZE - 1;
+
+/* Forward. */
+
+static int get_salen __P((const struct sockaddr *));
+static struct sockaddr * get_nsaddr __P((res_state, size_t));
+static int send_vc(res_state, const u_char *, int,
+ u_char *, int, int *, int);
+static int send_dg(res_state, const u_char *, int,
+ u_char *, int, int *, int,
+ int *, int *);
+static void Aerror(const res_state, FILE *, const char *, int,
+ const struct sockaddr *, int);
+static void Perror(const res_state, FILE *, const char *, int);
+static int sock_eq(struct sockaddr *, struct sockaddr *);
+#ifdef NEED_PSELECT
+static int pselect(int, void *, void *, void *,
+ struct timespec *,
+ const sigset_t *);
+#endif
+void res_pquery(const res_state, const u_char *, int, FILE *);
+
+
+/* BIONIC-BEGIN: implement source port randomization */
+typedef union {
+ struct sockaddr sa;
+ struct sockaddr_in sin;
+ struct sockaddr_in6 sin6;
+} _sockaddr_union;
+
+static int
+random_bind( int s, int family )
+{
+ _sockaddr_union u;
+ int j;
+ socklen_t slen;
+
+ /* clear all, this also sets the IP4/6 address to 'any' */
+ memset( &u, 0, sizeof u );
+
+ switch (family) {
+ case AF_INET:
+ u.sin.sin_family = family;
+ slen = sizeof u.sin;
+ break;
+ case AF_INET6:
+ u.sin6.sin6_family = family;
+ slen = sizeof u.sin6;
+ break;
+ default:
+ errno = EPROTO;
+ return -1;
+ }
+
+ /* first try to bind to a random source port a few times */
+ for (j = 0; j < 10; j++) {
+ /* find a random port between 1025 .. 65534 */
+ int port = 1025 + (res_randomid() % (65535-1025));
+ if (family == AF_INET)
+ u.sin.sin_port = htons(port);
+ else
+ u.sin6.sin6_port = htons(port);
+
+ if ( !bind( s, &u.sa, slen ) )
+ return 0;
+ }
+
+ /* nothing after 10 tries, our network table is probably busy */
+ /* let the system decide which port is best */
+ if (family == AF_INET)
+ u.sin.sin_port = 0;
+ else
+ u.sin6.sin6_port = 0;
+
+ return bind( s, &u.sa, slen );
+}
+/* BIONIC-END */
+
+static const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
+
+/* Public. */
+
+/* int
+ * res_isourserver(ina)
+ * looks up "ina" in _res.ns_addr_list[]
+ * returns:
+ * 0 : not found
+ * >0 : found
+ * author:
+ * paul vixie, 29may94
+ */
+int
+res_ourserver_p(const res_state statp, const struct sockaddr *sa) {
+ const struct sockaddr_in *inp, *srv;
+ const struct sockaddr_in6 *in6p, *srv6;
+ int ns;
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ inp = (const struct sockaddr_in *)(const void *)sa;
+ for (ns = 0; ns < statp->nscount; ns++) {
+ srv = (struct sockaddr_in *)(void *)get_nsaddr(statp, (size_t)ns);
+ if (srv->sin_family == inp->sin_family &&
+ srv->sin_port == inp->sin_port &&
+ (srv->sin_addr.s_addr == INADDR_ANY ||
+ srv->sin_addr.s_addr == inp->sin_addr.s_addr))
+ return (1);
+ }
+ break;
+ case AF_INET6:
+ if (EXT(statp).ext == NULL)
+ break;
+ in6p = (const struct sockaddr_in6 *)(const void *)sa;
+ for (ns = 0; ns < statp->nscount; ns++) {
+ srv6 = (struct sockaddr_in6 *)(void *)get_nsaddr(statp, (size_t)ns);
+ if (srv6->sin6_family == in6p->sin6_family &&
+ srv6->sin6_port == in6p->sin6_port &&
+#ifdef HAVE_SIN6_SCOPE_ID
+ (srv6->sin6_scope_id == 0 ||
+ srv6->sin6_scope_id == in6p->sin6_scope_id) &&
+#endif
+ (IN6_IS_ADDR_UNSPECIFIED(&srv6->sin6_addr) ||
+ IN6_ARE_ADDR_EQUAL(&srv6->sin6_addr, &in6p->sin6_addr)))
+ return (1);
+ }
+ break;
+ default:
+ break;
+ }
+ return (0);
+}
+
+/* int
+ * res_nameinquery(name, type, class, buf, eom)
+ * look for (name,type,class) in the query section of packet (buf,eom)
+ * requires:
+ * buf + HFIXEDSZ <= eom
+ * returns:
+ * -1 : format error
+ * 0 : not found
+ * >0 : found
+ * author:
+ * paul vixie, 29may94
+ */
+int
+res_nameinquery(const char *name, int type, int class,
+ const u_char *buf, const u_char *eom)
+{
+ const u_char *cp = buf + HFIXEDSZ;
+ int qdcount = ntohs(((const HEADER*)(const void *)buf)->qdcount);
+
+ while (qdcount-- > 0) {
+ char tname[MAXDNAME+1];
+ int n, ttype, tclass;
+
+ n = dn_expand(buf, eom, cp, tname, sizeof tname);
+ if (n < 0)
+ return (-1);
+ cp += n;
+ if (cp + 2 * INT16SZ > eom)
+ return (-1);
+ ttype = ns_get16(cp); cp += INT16SZ;
+ tclass = ns_get16(cp); cp += INT16SZ;
+ if (ttype == type && tclass == class &&
+ ns_samename(tname, name) == 1)
+ return (1);
+ }
+ return (0);
+}
+
+/* int
+ * res_queriesmatch(buf1, eom1, buf2, eom2)
+ * is there a 1:1 mapping of (name,type,class)
+ * in (buf1,eom1) and (buf2,eom2)?
+ * returns:
+ * -1 : format error
+ * 0 : not a 1:1 mapping
+ * >0 : is a 1:1 mapping
+ * author:
+ * paul vixie, 29may94
+ */
+int
+res_queriesmatch(const u_char *buf1, const u_char *eom1,
+ const u_char *buf2, const u_char *eom2)
+{
+ const u_char *cp = buf1 + HFIXEDSZ;
+ int qdcount = ntohs(((const HEADER*)(const void *)buf1)->qdcount);
+
+ if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
+ return (-1);
+
+ /*
+ * Only header section present in replies to
+ * dynamic update packets.
+ */
+ if ((((const HEADER *)(const void *)buf1)->opcode == ns_o_update) &&
+ (((const HEADER *)(const void *)buf2)->opcode == ns_o_update))
+ return (1);
+
+ if (qdcount != ntohs(((const HEADER*)(const void *)buf2)->qdcount))
+ return (0);
+ while (qdcount-- > 0) {
+ char tname[MAXDNAME+1];
+ int n, ttype, tclass;
+
+ n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
+ if (n < 0)
+ return (-1);
+ cp += n;
+ if (cp + 2 * INT16SZ > eom1)
+ return (-1);
+ ttype = ns_get16(cp); cp += INT16SZ;
+ tclass = ns_get16(cp); cp += INT16SZ;
+ if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
+ return (0);
+ }
+ return (1);
+}
+
+int
+res_nsend(res_state statp,
+ const u_char *buf, int buflen, u_char *ans, int anssiz)
+{
+ int gotsomewhere, terrno, try, v_circuit, resplen, ns, n;
+ char abuf[NI_MAXHOST];
+
+ if (statp->nscount == 0) {
+ errno = ESRCH;
+ return (-1);
+ }
+ if (anssiz < HFIXEDSZ) {
+ errno = EINVAL;
+ return (-1);
+ }
+ DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
+ (stdout, ";; res_send()\n"), buf, buflen);
+ v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
+ gotsomewhere = 0;
+ terrno = ETIMEDOUT;
+
+ /*
+ * If the ns_addr_list in the resolver context has changed, then
+ * invalidate our cached copy and the associated timing data.
+ */
+ if (EXT(statp).nscount != 0) {
+ int needclose = 0;
+ struct sockaddr_storage peer;
+ socklen_t peerlen;
+
+ if (EXT(statp).nscount != statp->nscount)
+ needclose++;
+ else
+ for (ns = 0; ns < statp->nscount; ns++) {
+ if (statp->nsaddr_list[ns].sin_family &&
+ !sock_eq((struct sockaddr *)(void *)&statp->nsaddr_list[ns],
+ (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[ns])) {
+ needclose++;
+ break;
+ }
+
+ if (EXT(statp).nssocks[ns] == -1)
+ continue;
+ peerlen = sizeof(peer);
+ if (getsockname(EXT(statp).nssocks[ns],
+ (struct sockaddr *)(void *)&peer, &peerlen) < 0) {
+ needclose++;
+ break;
+ }
+ if (!sock_eq((struct sockaddr *)(void *)&peer,
+ get_nsaddr(statp, (size_t)ns))) {
+ needclose++;
+ break;
+ }
+ }
+ if (needclose) {
+ res_nclose(statp);
+ EXT(statp).nscount = 0;
+ }
+ }
+
+ /*
+ * Maybe initialize our private copy of the ns_addr_list.
+ */
+ if (EXT(statp).nscount == 0) {
+ for (ns = 0; ns < statp->nscount; ns++) {
+ EXT(statp).nstimes[ns] = RES_MAXTIME;
+ EXT(statp).nssocks[ns] = -1;
+ if (!statp->nsaddr_list[ns].sin_family)
+ continue;
+ EXT(statp).ext->nsaddrs[ns].sin =
+ statp->nsaddr_list[ns];
+ }
+ EXT(statp).nscount = statp->nscount;
+ }
+
+ /*
+ * Some resolvers want to even out the load on their nameservers.
+ * Note that RES_BLAST overrides RES_ROTATE.
+ */
+ if ((statp->options & RES_ROTATE) != 0U &&
+ (statp->options & RES_BLAST) == 0U) {
+ union res_sockaddr_union inu;
+ struct sockaddr_in ina;
+ int lastns = statp->nscount - 1;
+ int fd;
+ u_int16_t nstime;
+
+ if (EXT(statp).ext != NULL)
+ inu = EXT(statp).ext->nsaddrs[0];
+ ina = statp->nsaddr_list[0];
+ fd = EXT(statp).nssocks[0];
+ nstime = EXT(statp).nstimes[0];
+ for (ns = 0; ns < lastns; ns++) {
+ if (EXT(statp).ext != NULL)
+ EXT(statp).ext->nsaddrs[ns] =
+ EXT(statp).ext->nsaddrs[ns + 1];
+ statp->nsaddr_list[ns] = statp->nsaddr_list[ns + 1];
+ EXT(statp).nssocks[ns] = EXT(statp).nssocks[ns + 1];
+ EXT(statp).nstimes[ns] = EXT(statp).nstimes[ns + 1];
+ }
+ if (EXT(statp).ext != NULL)
+ EXT(statp).ext->nsaddrs[lastns] = inu;
+ statp->nsaddr_list[lastns] = ina;
+ EXT(statp).nssocks[lastns] = fd;
+ EXT(statp).nstimes[lastns] = nstime;
+ }
+
+ /*
+ * Send request, RETRY times, or until successful.
+ */
+ for (try = 0; try < statp->retry; try++) {
+ for (ns = 0; ns < statp->nscount; ns++) {
+ struct sockaddr *nsap;
+ int nsaplen;
+ nsap = get_nsaddr(statp, (size_t)ns);
+ nsaplen = get_salen(nsap);
+ statp->_flags &= ~RES_F_LASTMASK;
+ statp->_flags |= (ns << RES_F_LASTSHIFT);
+ same_ns:
+ if (statp->qhook) {
+ int done = 0, loops = 0;
+
+ do {
+ res_sendhookact act;
+
+ act = (*statp->qhook)(&nsap, &buf, &buflen,
+ ans, anssiz, &resplen);
+ switch (act) {
+ case res_goahead:
+ done = 1;
+ break;
+ case res_nextns:
+ res_nclose(statp);
+ goto next_ns;
+ case res_done:
+ return (resplen);
+ case res_modified:
+ /* give the hook another try */
+ if (++loops < 42) /*doug adams*/
+ break;
+ /*FALLTHROUGH*/
+ case res_error:
+ /*FALLTHROUGH*/
+ default:
+ goto fail;
+ }
+ } while (!done);
+ }
+
+ Dprint(((statp->options & RES_DEBUG) &&
+ getnameinfo(nsap, (socklen_t)nsaplen, abuf, sizeof(abuf),
+ NULL, 0, niflags) == 0),
+ (stdout, ";; Querying server (# %d) address = %s\n",
+ ns + 1, abuf));
+
+
+ if (v_circuit) {
+ /* Use VC; at most one attempt per server. */
+ try = statp->retry;
+ n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
+ ns);
+ if (n < 0)
+ goto fail;
+ if (n == 0)
+ goto next_ns;
+ resplen = n;
+ } else {
+ /* Use datagrams. */
+ n = send_dg(statp, buf, buflen, ans, anssiz, &terrno,
+ ns, &v_circuit, &gotsomewhere);
+ if (n < 0)
+ goto fail;
+ if (n == 0)
+ goto next_ns;
+ if (v_circuit)
+ goto same_ns;
+ resplen = n;
+ }
+
+ Dprint((statp->options & RES_DEBUG) ||
+ ((statp->pfcode & RES_PRF_REPLY) &&
+ (statp->pfcode & RES_PRF_HEAD1)),
+ (stdout, ";; got answer:\n"));
+
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
+ (stdout, "%s", ""),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+
+ /*
+ * If we have temporarily opened a virtual circuit,
+ * or if we haven't been asked to keep a socket open,
+ * close the socket.
+ */
+ if ((v_circuit && (statp->options & RES_USEVC) == 0U) ||
+ (statp->options & RES_STAYOPEN) == 0U) {
+ res_nclose(statp);
+ }
+ if (statp->rhook) {
+ int done = 0, loops = 0;
+
+ do {
+ res_sendhookact act;
+
+ act = (*statp->rhook)(nsap, buf, buflen,
+ ans, anssiz, &resplen);
+ switch (act) {
+ case res_goahead:
+ case res_done:
+ done = 1;
+ break;
+ case res_nextns:
+ res_nclose(statp);
+ goto next_ns;
+ case res_modified:
+ /* give the hook another try */
+ if (++loops < 42) /*doug adams*/
+ break;
+ /*FALLTHROUGH*/
+ case res_error:
+ /*FALLTHROUGH*/
+ default:
+ goto fail;
+ }
+ } while (!done);
+
+ }
+ return (resplen);
+ next_ns: ;
+ } /*foreach ns*/
+ } /*foreach retry*/
+ res_nclose(statp);
+ if (!v_circuit) {
+ if (!gotsomewhere)
+ errno = ECONNREFUSED; /* no nameservers found */
+ else
+ errno = ETIMEDOUT; /* no answer obtained */
+ } else
+ errno = terrno;
+ return (-1);
+ fail:
+ res_nclose(statp);
+ return (-1);
+}
+
+/* Private */
+
+static int
+get_salen(sa)
+ const struct sockaddr *sa;
+{
+
+#ifdef HAVE_SA_LEN
+ /* There are people do not set sa_len. Be forgiving to them. */
+ if (sa->sa_len)
+ return (sa->sa_len);
+#endif
+
+ if (sa->sa_family == AF_INET)
+ return (sizeof(struct sockaddr_in));
+ else if (sa->sa_family == AF_INET6)
+ return (sizeof(struct sockaddr_in6));
+ else
+ return (0); /* unknown, die on connect */
+}
+
+/*
+ * pick appropriate nsaddr_list for use. see res_init() for initialization.
+ */
+static struct sockaddr *
+get_nsaddr(statp, n)
+ res_state statp;
+ size_t n;
+{
+
+ if (!statp->nsaddr_list[n].sin_family && EXT(statp).ext) {
+ /*
+ * - EXT(statp).ext->nsaddrs[n] holds an address that is larger
+ * than struct sockaddr, and
+ * - user code did not update statp->nsaddr_list[n].
+ */
+ return (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[n];
+ } else {
+ /*
+ * - user code updated statp->nsaddr_list[n], or
+ * - statp->nsaddr_list[n] has the same content as
+ * EXT(statp).ext->nsaddrs[n].
+ */
+ return (struct sockaddr *)(void *)&statp->nsaddr_list[n];
+ }
+}
+
+static int
+send_vc(res_state statp,
+ const u_char *buf, int buflen, u_char *ans, int anssiz,
+ int *terrno, int ns)
+{
+ const HEADER *hp = (const HEADER *)(const void *)buf;
+ HEADER *anhp = (HEADER *)(void *)ans;
+ struct sockaddr *nsap;
+ int nsaplen;
+ int truncating, connreset, resplen, n;
+ struct iovec iov[2];
+ u_short len;
+ u_char *cp;
+ void *tmp;
+
+ nsap = get_nsaddr(statp, (size_t)ns);
+ nsaplen = get_salen(nsap);
+
+ connreset = 0;
+ same_ns:
+ truncating = 0;
+
+ /* Are we still talking to whom we want to talk to? */
+ if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
+ struct sockaddr_storage peer;
+ socklen_t size = sizeof peer;
+
+ if (getpeername(statp->_vcsock,
+ (struct sockaddr *)(void *)&peer, &size) < 0 ||
+ !sock_eq((struct sockaddr *)(void *)&peer, nsap)) {
+ res_nclose(statp);
+ statp->_flags &= ~RES_F_VC;
+ }
+ }
+
+ if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
+ if (statp->_vcsock >= 0)
+ res_nclose(statp);
+
+ statp->_vcsock = socket(nsap->sa_family, SOCK_STREAM, 0);
+ if (statp->_vcsock > highestFD) {
+ res_nclose(statp);
+ errno = ENOTSOCK;
+ }
+ if (statp->_vcsock < 0) {
+ switch (errno) {
+ case EPROTONOSUPPORT:
+#ifdef EPFNOSUPPORT
+ case EPFNOSUPPORT:
+#endif
+ case EAFNOSUPPORT:
+ Perror(statp, stderr, "socket(vc)", errno);
+ return (0);
+ default:
+ *terrno = errno;
+ Perror(statp, stderr, "socket(vc)", errno);
+ return (-1);
+ }
+ }
+ errno = 0;
+ if (random_bind(statp->_vcsock,nsap->sa_family) < 0) {
+ *terrno = errno;
+ Aerror(statp, stderr, "bind/vc", errno, nsap,
+ nsaplen);
+ res_nclose(statp);
+ return (0);
+ }
+ if (connect(statp->_vcsock, nsap, (socklen_t)nsaplen) < 0) {
+ *terrno = errno;
+ Aerror(statp, stderr, "connect/vc", errno, nsap,
+ nsaplen);
+ res_nclose(statp);
+ return (0);
+ }
+ statp->_flags |= RES_F_VC;
+ }
+
+ /*
+ * Send length & message
+ */
+ ns_put16((u_short)buflen, (u_char*)(void *)&len);
+ iov[0] = evConsIovec(&len, INT16SZ);
+ DE_CONST(buf, tmp);
+ iov[1] = evConsIovec(tmp, (size_t)buflen);
+ if (writev(statp->_vcsock, iov, 2) != (INT16SZ + buflen)) {
+ *terrno = errno;
+ Perror(statp, stderr, "write failed", errno);
+ res_nclose(statp);
+ return (0);
+ }
+ /*
+ * Receive length & response
+ */
+ read_len:
+ cp = ans;
+ len = INT16SZ;
+ while ((n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0) {
+ cp += n;
+ if ((len -= n) == 0)
+ break;
+ }
+ if (n <= 0) {
+ *terrno = errno;
+ Perror(statp, stderr, "read failed", errno);
+ res_nclose(statp);
+ /*
+ * A long running process might get its TCP
+ * connection reset if the remote server was
+ * restarted. Requery the server instead of
+ * trying a new one. When there is only one
+ * server, this means that a query might work
+ * instead of failing. We only allow one reset
+ * per query to prevent looping.
+ */
+ if (*terrno == ECONNRESET && !connreset) {
+ connreset = 1;
+ res_nclose(statp);
+ goto same_ns;
+ }
+ res_nclose(statp);
+ return (0);
+ }
+ resplen = ns_get16(ans);
+ if (resplen > anssiz) {
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; response truncated\n")
+ );
+ truncating = 1;
+ len = anssiz;
+ } else
+ len = resplen;
+ if (len < HFIXEDSZ) {
+ /*
+ * Undersized message.
+ */
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; undersized: %d\n", len));
+ *terrno = EMSGSIZE;
+ res_nclose(statp);
+ return (0);
+ }
+ cp = ans;
+ while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0){
+ cp += n;
+ len -= n;
+ }
+ if (n <= 0) {
+ *terrno = errno;
+ Perror(statp, stderr, "read(vc)", errno);
+ res_nclose(statp);
+ return (0);
+ }
+ if (truncating) {
+ /*
+ * Flush rest of answer so connection stays in synch.
+ */
+ anhp->tc = 1;
+ len = resplen - anssiz;
+ while (len != 0) {
+ char junk[PACKETSZ];
+
+ n = read(statp->_vcsock, junk,
+ (len > sizeof junk) ? sizeof junk : len);
+ if (n > 0)
+ len -= n;
+ else
+ break;
+ }
+ }
+ /*
+ * If the calling applicating has bailed out of
+ * a previous call and failed to arrange to have
+ * the circuit closed or the server has got
+ * itself confused, then drop the packet and
+ * wait for the correct one.
+ */
+ if (hp->id != anhp->id) {
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
+ (stdout, ";; old answer (unexpected):\n"),
+ ans, (resplen > anssiz) ? anssiz: resplen);
+ goto read_len;
+ }
+
+ /*
+ * All is well, or the error is fatal. Signal that the
+ * next nameserver ought not be tried.
+ */
+ return (resplen);
+}
+
+static int
+send_dg(res_state statp,
+ const u_char *buf, int buflen, u_char *ans, int anssiz,
+ int *terrno, int ns, int *v_circuit, int *gotsomewhere)
+{
+ const HEADER *hp = (const HEADER *)(const void *)buf;
+ HEADER *anhp = (HEADER *)(void *)ans;
+ const struct sockaddr *nsap;
+ int nsaplen;
+ struct timespec now, timeout, finish;
+ fd_set dsmask;
+ struct sockaddr_storage from;
+ socklen_t fromlen;
+ int resplen, seconds, n, s;
+
+ nsap = get_nsaddr(statp, (size_t)ns);
+ nsaplen = get_salen(nsap);
+ if (EXT(statp).nssocks[ns] == -1) {
+ EXT(statp).nssocks[ns] = socket(nsap->sa_family, SOCK_DGRAM, 0);
+ if (EXT(statp).nssocks[ns] > highestFD) {
+ res_nclose(statp);
+ errno = ENOTSOCK;
+ }
+ if (EXT(statp).nssocks[ns] < 0) {
+ switch (errno) {
+ case EPROTONOSUPPORT:
+#ifdef EPFNOSUPPORT
+ case EPFNOSUPPORT:
+#endif
+ case EAFNOSUPPORT:
+ Perror(statp, stderr, "socket(dg)", errno);
+ return (0);
+ default:
+ *terrno = errno;
+ Perror(statp, stderr, "socket(dg)", errno);
+ return (-1);
+ }
+ }
+#ifndef CANNOT_CONNECT_DGRAM
+ /*
+ * On a 4.3BSD+ machine (client and server,
+ * actually), sending to a nameserver datagram
+ * port with no nameserver will cause an
+ * ICMP port unreachable message to be returned.
+ * If our datagram socket is "connected" to the
+ * server, we get an ECONNREFUSED error on the next
+ * socket operation, and select returns if the
+ * error message is received. We can thus detect
+ * the absence of a nameserver without timing out.
+ */
+ if (random_bind(EXT(statp).nssocks[ns], nsap->sa_family) < 0) {
+ Aerror(statp, stderr, "bind(dg)", errno, nsap,
+ nsaplen);
+ res_nclose(statp);
+ return (0);
+ }
+ if (connect(EXT(statp).nssocks[ns], nsap, (socklen_t)nsaplen) < 0) {
+ Aerror(statp, stderr, "connect(dg)", errno, nsap,
+ nsaplen);
+ res_nclose(statp);
+ return (0);
+ }
+#endif /* !CANNOT_CONNECT_DGRAM */
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; new DG socket\n"))
+ }
+ s = EXT(statp).nssocks[ns];
+#ifndef CANNOT_CONNECT_DGRAM
+ if (send(s, (const char*)buf, (size_t)buflen, 0) != buflen) {
+ Perror(statp, stderr, "send", errno);
+ res_nclose(statp);
+ return (0);
+ }
+#else /* !CANNOT_CONNECT_DGRAM */
+ if (sendto(s, (const char*)buf, buflen, 0, nsap, nsaplen) != buflen)
+ {
+ Aerror(statp, stderr, "sendto", errno, nsap, nsaplen);
+ res_nclose(statp);
+ return (0);
+ }
+#endif /* !CANNOT_CONNECT_DGRAM */
+
+ /*
+ * Wait for reply.
+ */
+ seconds = (statp->retrans << ns);
+ if (ns > 0)
+ seconds /= statp->nscount;
+ if (seconds <= 0)
+ seconds = 1;
+ now = evNowTime();
+ timeout = evConsTime((long)seconds, 0L);
+ finish = evAddTime(now, timeout);
+ goto nonow;
+ wait:
+ now = evNowTime();
+ nonow:
+ FD_ZERO(&dsmask);
+ FD_SET(s, &dsmask);
+ if (evCmpTime(finish, now) > 0)
+ timeout = evSubTime(finish, now);
+ else
+ timeout = evConsTime(0L, 0L);
+ n = pselect(s + 1, &dsmask, NULL, NULL, &timeout, NULL);
+ if (n == 0) {
+ Dprint(statp->options & RES_DEBUG, (stdout, ";; timeout\n"));
+ *gotsomewhere = 1;
+ return (0);
+ }
+ if (n < 0) {
+ if (errno == EINTR)
+ goto wait;
+ Perror(statp, stderr, "select", errno);
+ res_nclose(statp);
+ return (0);
+ }
+ errno = 0;
+ fromlen = sizeof(from);
+ resplen = recvfrom(s, (char*)ans, (size_t)anssiz,0,
+ (struct sockaddr *)(void *)&from, &fromlen);
+ if (resplen <= 0) {
+ Perror(statp, stderr, "recvfrom", errno);
+ res_nclose(statp);
+ return (0);
+ }
+ *gotsomewhere = 1;
+ if (resplen < HFIXEDSZ) {
+ /*
+ * Undersized message.
+ */
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; undersized: %d\n",
+ resplen));
+ *terrno = EMSGSIZE;
+ res_nclose(statp);
+ return (0);
+ }
+ if (hp->id != anhp->id) {
+ /*
+ * response from old query, ignore it.
+ * XXX - potential security hazard could
+ * be detected here.
+ */
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
+ (stdout, ";; old answer:\n"),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+ goto wait;
+ }
+ if (!(statp->options & RES_INSECURE1) &&
+ !res_ourserver_p(statp, (struct sockaddr *)(void *)&from)) {
+ /*
+ * response from wrong server? ignore it.
+ * XXX - potential security hazard could
+ * be detected here.
+ */
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
+ (stdout, ";; not our server:\n"),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+ goto wait;
+ }
+#ifdef RES_USE_EDNS0
+ if (anhp->rcode == FORMERR && (statp->options & RES_USE_EDNS0) != 0U) {
+ /*
+ * Do not retry if the server do not understand EDNS0.
+ * The case has to be captured here, as FORMERR packet do not
+ * carry query section, hence res_queriesmatch() returns 0.
+ */
+ DprintQ(statp->options & RES_DEBUG,
+ (stdout, "server rejected query with EDNS0:\n"),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+ /* record the error */
+ statp->_flags |= RES_F_EDNS0ERR;
+ res_nclose(statp);
+ return (0);
+ }
+#endif
+ if (!(statp->options & RES_INSECURE2) &&
+ !res_queriesmatch(buf, buf + buflen,
+ ans, ans + anssiz)) {
+ /*
+ * response contains wrong query? ignore it.
+ * XXX - potential security hazard could
+ * be detected here.
+ */
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
+ (stdout, ";; wrong query name:\n"),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+ goto wait;
+ }
+ if (anhp->rcode == SERVFAIL ||
+ anhp->rcode == NOTIMP ||
+ anhp->rcode == REFUSED) {
+ DprintQ(statp->options & RES_DEBUG,
+ (stdout, "server rejected query:\n"),
+ ans, (resplen > anssiz) ? anssiz : resplen);
+ res_nclose(statp);
+ /* don't retry if called from dig */
+ if (!statp->pfcode)
+ return (0);
+ }
+ if (!(statp->options & RES_IGNTC) && anhp->tc) {
+ /*
+ * To get the rest of answer,
+ * use TCP with same server.
+ */
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; truncated answer\n"));
+ *v_circuit = 1;
+ res_nclose(statp);
+ return (1);
+ }
+ /*
+ * All is well, or the error is fatal. Signal that the
+ * next nameserver ought not be tried.
+ */
+ return (resplen);
+}
+
+static void
+Aerror(const res_state statp, FILE *file, const char *string, int error,
+ const struct sockaddr *address, int alen)
+{
+ int save = errno;
+ char hbuf[NI_MAXHOST];
+ char sbuf[NI_MAXSERV];
+
+ alen = alen;
+
+ if ((statp->options & RES_DEBUG) != 0U) {
+ if (getnameinfo(address, (socklen_t)alen, hbuf, sizeof(hbuf),
+ sbuf, sizeof(sbuf), niflags)) {
+ strncpy(hbuf, "?", sizeof(hbuf) - 1);
+ hbuf[sizeof(hbuf) - 1] = '\0';
+ strncpy(sbuf, "?", sizeof(sbuf) - 1);
+ sbuf[sizeof(sbuf) - 1] = '\0';
+ }
+ fprintf(file, "res_send: %s ([%s].%s): %s\n",
+ string, hbuf, sbuf, strerror(error));
+ }
+ errno = save;
+}
+
+static void
+Perror(const res_state statp, FILE *file, const char *string, int error) {
+ int save = errno;
+
+ if ((statp->options & RES_DEBUG) != 0U)
+ fprintf(file, "res_send: %s: %s\n",
+ string, strerror(error));
+ errno = save;
+}
+
+static int
+sock_eq(struct sockaddr *a, struct sockaddr *b) {
+ struct sockaddr_in *a4, *b4;
+ struct sockaddr_in6 *a6, *b6;
+
+ if (a->sa_family != b->sa_family)
+ return 0;
+ switch (a->sa_family) {
+ case AF_INET:
+ a4 = (struct sockaddr_in *)(void *)a;
+ b4 = (struct sockaddr_in *)(void *)b;
+ return a4->sin_port == b4->sin_port &&
+ a4->sin_addr.s_addr == b4->sin_addr.s_addr;
+ case AF_INET6:
+ a6 = (struct sockaddr_in6 *)(void *)a;
+ b6 = (struct sockaddr_in6 *)(void *)b;
+ return a6->sin6_port == b6->sin6_port &&
+#ifdef HAVE_SIN6_SCOPE_ID
+ a6->sin6_scope_id == b6->sin6_scope_id &&
+#endif
+ IN6_ARE_ADDR_EQUAL(&a6->sin6_addr, &b6->sin6_addr);
+ default:
+ return 0;
+ }
+}
+
+#ifdef NEED_PSELECT
+/* XXX needs to move to the porting library. */
+static int
+pselect(int nfds, void *rfds, void *wfds, void *efds,
+ struct timespec *tsp, const sigset_t *sigmask)
+{
+ struct timeval tv, *tvp;
+ sigset_t sigs;
+ int n;
+
+ if (tsp) {
+ tvp = &tv;
+ tv = evTimeVal(*tsp);
+ } else
+ tvp = NULL;
+ if (sigmask)
+ sigprocmask(SIG_SETMASK, sigmask, &sigs);
+ n = select(nfds, rfds, wfds, efds, tvp);
+ if (sigmask)
+ sigprocmask(SIG_SETMASK, &sigs, NULL);
+ if (tsp)
+ *tsp = evTimeSpec(tv);
+ return (n);
+}
+#endif