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authorUlrich Drepper <drepper@redhat.com>1999-12-04 18:05:55 +0000
committerUlrich Drepper <drepper@redhat.com>1999-12-04 18:05:55 +0000
commitb43b13ac2544b11f35be301d1589b51a8473e32b (patch)
tree6520da2e17c933ebc29b4572cdcc27410b10a4c4 /resolv/res_send.c
parent591e1ffbf8db5e059b9bcf3bde6d7758f018a46d (diff)
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Update.
1999-12-03 Andreas Jaeger <aj@suse.de> * nss/getXXbyYY.c: Include <resolv.h> (FUNCTION_NAME): Use res_ninit instead of res_init. * nss/getXXbyYY_r.c [NEED__RES]: Include <resolv.h> for _res declaration and prototypes. Remove extra _res declaration. (INTERNAL): Use thread aware res_ninit function. * inet/gethstbyad_r.c: Include <resolv.h>. * resolv/res_data.c: Update from Bind 8.2.2-P5. Moved res_init to res_libc.c. Disabled unneeded functions. * resolv/res_libc.c: New file. * Versions.def: Add version GLIBC_2.2 for libpthread. Add versions GLIBC_2.1 and GLIBC_2.2 for libresolv. * include/resolv.h: Add internal interfaces. * resolv/Makefile (routines): Add new files. (libresolv-routines): Likewise. (distribute): Likewise. * resolv/gethnamaddr.c: Use thread safe resolver functions. * resolv/nss_dns/dns-host.c: Likewise. * resolv/nss_dns/dns-network.c: Likewise. * resolv/arpa/nameser.h: Update from Bind 8.2.2-P5. * resolv/nsap_addr.c: Likewise. * resolv/res_comp.c: Likewise. * resolv/res_debug.c: Likewise. * resolv/res_init.c: Likewise. * resolv/res_mkquery.c: Likewise. * resolv/res_query.c: Likewise. * resolv/res_send.c: Likewise. * resolv/resolv.h: Likewise. * resolv/Versions: Add __res_state and __res_ninit with version GLIBC_2.2 to libc. Add new interfaces with version GLIBC_2.2 to libresolv. * resolv/Banner: Update. * include/arpa/nameser_compat.h: New file. * resolv/ns_name.c: New file from Bind 8.2.2-P5. * resolv/ns_netint.c: Likewise. * resolv/ns_parse.c: Likewise. * resolv/ns_print.c: Likewise. * resolv/ns_samedomain.c: Likewise. * resolv/ns_ttl.c: Likewise. * resolv/arpa/nameser_compat.h: Likewise. * resolv/res_debug.h: Likewise. Some patches are based on work done by Adam D. Bradley <artdodge@cs.bu.edu>. * sysdeps/unix/sysv/linux/configure.in: Remove check for ldconfig, set always use_ldconfig instead.
Diffstat (limited to 'resolv/res_send.c')
-rw-r--r--resolv/res_send.c759
1 files changed, 429 insertions, 330 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c
index e315383fa7..d3dc2ba8e1 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -1,6 +1,4 @@
/*
- * ++Copyright++ 1985, 1989, 1993
- * -
* Copyright (c) 1985, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
@@ -27,7 +25,9 @@
* 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
@@ -45,133 +45,165 @@
* 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--
+ */
+
+/*
+ * 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
-static char rcsid[] = "$Id$";
+static const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
+static const char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */
- /* change this to "0"
- * if you talk to a lot
- * of multi-homed SunOS
- * ("broken") name servers.
- */
-#define CHECK_SRVR_ADDR 1 /* XXX - should be in options.h */
-
/*
* Send query to name server and wait for reply.
*/
#include <sys/types.h>
#include <sys/param.h>
-#include <sys/poll.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/uio.h>
+
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
-#include <stdio.h>
-#include <netdb.h>
#include <errno.h>
+#include <netdb.h>
#include <resolv.h>
-#if defined(BSD) && (BSD >= 199306)
-# include <stdlib.h>
-# include <string.h>
-# include <unistd.h>
-#else
-# include "../conf/portability.h"
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/poll.h>
+
+/* Options. Leave them on. */
+/* #undef DEBUG */
+#include "res_debug.h"
+
+#ifdef NEED_PSELECT
+static int pselect(int, void *, void *, void *,
+ struct timespec *,
+ const sigset_t *);
#endif
-#include <bits/libc-lock.h>
+#define CHECK_SRVR_ADDR
-/* Lock to protect the connection use. */
-__libc_lock_define_initialized (static, lock)
+/* From bind lib/isc/ev_timers.c: */
+#define BILLION 1000000000
+static struct timespec
+evTimeSpec(struct timeval tv) {
+ struct timespec ts;
-static void res_close_internal (void);
+ ts.tv_sec = tv.tv_sec;
+ ts.tv_nsec = tv.tv_usec * 1000;
+ return (ts);
+}
-#if defined(USE_OPTIONS_H)
-# include <../conf/options.h>
-#endif
+static struct timespec
+evConsTime(time_t sec, long nsec) {
+ struct timespec x;
-static int s = -1; /* socket used for communications */
-static int connected = 0; /* is the socket connected */
-static int vc = 0; /* is the socket a virtual circuit? */
+ x.tv_sec = sec;
+ x.tv_nsec = nsec;
+ return (x);
+}
-/* XXX - this should be done in portability.h */
-#if (defined(BSD) && (BSD >= 199103)) || defined(linux)
-# define CAN_RECONNECT 1
-#else
-# define CAN_RECONNECT 0
-#endif
+static struct timespec
+evAddTime(struct timespec addend1, struct timespec addend2) {
+ struct timespec x;
-#ifndef DEBUG
-# define Dprint(cond, args) /*empty*/
-# define DprintQ(cond, args, query, size) /*empty*/
-# define Aerror(file, string, error, address) /*empty*/
-# define Perror(file, string, error) /*empty*/
-#else
-# define Dprint(cond, args) if (cond) {fprintf args;} else {}
-# define DprintQ(cond, args, query, size) if (cond) {\
- fprintf args;\
- __fp_nquery(query, size, stdout);\
- } else {}
+ x.tv_sec = addend1.tv_sec + addend2.tv_sec;
+ x.tv_nsec = addend1.tv_nsec + addend2.tv_nsec;
+ if (x.tv_nsec >= BILLION) {
+ x.tv_sec++;
+ x.tv_nsec -= BILLION;
+ }
+ return (x);
+}
+
+static struct timespec
+evSubTime(struct timespec minuend, struct timespec subtrahend) {
+ struct timespec x;
+
+ x.tv_sec = minuend.tv_sec - subtrahend.tv_sec;
+ if (minuend.tv_nsec >= subtrahend.tv_nsec)
+ x.tv_nsec = minuend.tv_nsec - subtrahend.tv_nsec;
+ else {
+ x.tv_nsec = BILLION - subtrahend.tv_nsec + minuend.tv_nsec;
+ x.tv_sec--;
+ }
+ return (x);
+}
+
+static int
+evCmpTime(struct timespec a, struct timespec b) {
+ long x = a.tv_sec - b.tv_sec;
+
+ if (x == 0L)
+ x = a.tv_nsec - b.tv_nsec;
+ return (x < 0L ? (-1) : x > 0L ? (1) : (0));
+}
+
+static struct timespec
+evNowTime() {
+ struct timeval now;
+
+ if (gettimeofday(&now, NULL) < 0)
+ return (evConsTime(0, 0));
+ return (evTimeSpec(now));
+}
+/* End of code from bind lib/isc/ev_timers.c. */
+
+#ifdef DEBUG
static void
- Aerror(file, string, error, address)
- FILE *file;
- char *string;
- int error;
- struct sockaddr_in address;
+ Aerror(const res_state statp, FILE *file, const char *string, int error,
+ struct sockaddr_in address)
{
int save = errno;
- if (_res.options & RES_DEBUG) {
+ if ((statp->options & RES_DEBUG) != 0) {
+ char tmp[sizeof "255.255.255.255"];
+
fprintf(file, "res_send: %s ([%s].%u): %s\n",
string,
- inet_ntoa(address.sin_addr),
+ inet_ntop(address.sin_family, &address.sin_addr,
+ tmp, sizeof tmp),
ntohs(address.sin_port),
strerror(error));
}
__set_errno (save);
}
static void
- Perror(file, string, error)
- FILE *file;
- char *string;
- int error;
- {
+ Perror(const res_state statp, FILE *file, const char *string, int error) {
int save = errno;
- if (_res.options & RES_DEBUG) {
+ if ((statp->options & RES_DEBUG) != 0)
fprintf(file, "res_send: %s: %s\n",
string, strerror(error));
- }
__set_errno (save);
}
#endif
-static res_send_qhook Qhook = NULL;
-static res_send_rhook Rhook = NULL;
-
-void
-res_send_setqhook(hook)
- res_send_qhook hook;
-{
-
- Qhook = hook;
-}
-
-void
-res_send_setrhook(hook)
- res_send_rhook hook;
-{
-
- Rhook = hook;
-}
+static int cmpsock(struct sockaddr_in *a1, struct sockaddr_in *a2);
+void res_pquery(const res_state, const u_char *, int, FILE *);
/* int
* res_isourserver(ina)
@@ -183,33 +215,28 @@ res_send_setrhook(hook)
* paul vixie, 29may94
*/
int
-res_isourserver(inp)
- const struct sockaddr_in *inp;
-{
+res_ourserver_p(const res_state statp, const struct sockaddr_in *inp) {
struct sockaddr_in ina;
- register int ns, ret;
+ int ns;
ina = *inp;
- ret = 0;
- for (ns = 0; ns < _res.nscount; ns++) {
- register const struct sockaddr_in *srv = &_res.nsaddr_list[ns];
+ for (ns = 0; ns < statp->nscount; ns++) {
+ const struct sockaddr_in *srv = &statp->nsaddr_list[ns];
if (srv->sin_family == ina.sin_family &&
srv->sin_port == ina.sin_port &&
(srv->sin_addr.s_addr == INADDR_ANY ||
- srv->sin_addr.s_addr == ina.sin_addr.s_addr)) {
- ret++;
- break;
- }
+ srv->sin_addr.s_addr == ina.sin_addr.s_addr))
+ return (1);
}
- return (ret);
+ 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 + HFIXESDZ <= eom
+ * buf + HFIXEDSZ <= eom
* returns:
* -1 : format error
* 0 : not found
@@ -218,17 +245,15 @@ res_isourserver(inp)
* paul vixie, 29may94
*/
int
-res_nameinquery(name, type, class, buf, eom)
- const char *name;
- register int type, class;
- const u_char *buf, *eom;
+res_nameinquery(const char *name, int type, int class,
+ const u_char *buf, const u_char *eom)
{
- register const u_char *cp = buf + HFIXEDSZ;
+ const u_char *cp = buf + HFIXEDSZ;
int qdcount = ntohs(((HEADER*)buf)->qdcount);
while (qdcount-- > 0) {
char tname[MAXDNAME+1];
- register int n, ttype, tclass;
+ int n, ttype, tclass;
n = dn_expand(buf, eom, cp, tname, sizeof tname);
if (n < 0)
@@ -236,11 +261,10 @@ res_nameinquery(name, type, class, buf, eom)
cp += n;
if (cp + 2 * INT16SZ > eom)
return (-1);
- ttype = _getshort(cp); cp += INT16SZ;
- tclass = _getshort(cp); cp += INT16SZ;
- if (ttype == type &&
- tclass == class &&
- strcasecmp(tname, name) == 0)
+ 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);
@@ -258,21 +282,28 @@ res_nameinquery(name, type, class, buf, eom)
* paul vixie, 29may94
*/
int
-res_queriesmatch(buf1, eom1, buf2, eom2)
- const u_char *buf1, *eom1;
- const u_char *buf2, *eom2;
+res_queriesmatch(const u_char *buf1, const u_char *eom1,
+ const u_char *buf2, const u_char *eom2)
{
- register const u_char *cp = buf1 + HFIXEDSZ;
+ const u_char *cp = buf1 + HFIXEDSZ;
int qdcount = ntohs(((HEADER*)buf1)->qdcount);
if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
return (-1);
+ /*
+ * Only header section present in replies to
+ * dynamic update packets.
+ */
+ if ( (((HEADER *)buf1)->opcode == ns_o_update) &&
+ (((HEADER *)buf2)->opcode == ns_o_update) )
+ return (1);
+
if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
return (0);
while (qdcount-- > 0) {
char tname[MAXDNAME+1];
- register int n, ttype, tclass;
+ int n, ttype, tclass;
n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
if (n < 0)
@@ -280,8 +311,8 @@ res_queriesmatch(buf1, eom1, buf2, eom2)
cp += n;
if (cp + 2 * INT16SZ > eom1)
return (-1);
- ttype = _getshort(cp); cp += INT16SZ;
- tclass = _getshort(cp); cp += INT16SZ;
+ ttype = ns_get16(cp); cp += INT16SZ;
+ tclass = ns_get16(cp); cp += INT16SZ;
if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
return (0);
}
@@ -289,67 +320,69 @@ res_queriesmatch(buf1, eom1, buf2, eom2)
}
int
-res_send(buf, buflen, ans, anssiz)
- const u_char *buf;
- int buflen;
- u_char *ans;
- int anssiz;
+res_nsend(res_state statp,
+ const u_char *buf, int buflen, u_char *ans, int anssiz)
{
HEADER *hp = (HEADER *) buf;
HEADER *anhp = (HEADER *) ans;
- int gotsomewhere, connreset, terrno, try, v_circuit, resplen, ns;
- register int n;
- u_int badns; /* XXX NSMAX can't exceed #/bits in this var */
- int result = -1;
+ int gotsomewhere, connreset, terrno, try, v_circuit, resplen, ns, n;
+ u_int badns; /* XXX NSMAX can't exceed #/bits in this variable */
+ static int highestFD = FD_SETSIZE - 1;
- if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
- /* errno should have been set by res_init() in this case. */
- return (-1);
- }
if (anssiz < HFIXEDSZ) {
__set_errno (EINVAL);
return (-1);
}
- DprintQ((_res.options & RES_DEBUG) || (_res.pfcode & RES_PRF_QUERY),
+ DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
(stdout, ";; res_send()\n"), buf, buflen);
- v_circuit = (_res.options & RES_USEVC) || buflen > PACKETSZ;
+ v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
gotsomewhere = 0;
connreset = 0;
terrno = ETIMEDOUT;
badns = 0;
- __libc_lock_lock (lock);
+ /*
+ * Some callers want to even out the load on their resolver list.
+ */
+ if (statp->nscount > 0 && (statp->options & RES_ROTATE) != 0) {
+ struct sockaddr_in ina;
+ int lastns = statp->nscount - 1;
+
+ ina = statp->nsaddr_list[0];
+ for (ns = 0; ns < lastns; ns++)
+ statp->nsaddr_list[ns] = statp->nsaddr_list[ns + 1];
+ statp->nsaddr_list[lastns] = ina;
+ }
/*
* Send request, RETRY times, or until successful
*/
- for (try = 0; try < _res.retry; try++) {
- for (ns = 0; ns < _res.nscount; ns++) {
- struct sockaddr_in *nsap = &_res.nsaddr_list[ns];
- same_ns:
+ for (try = 0; try < statp->retry; try++) {
+ for (ns = 0; ns < statp->nscount; ns++) {
+ struct sockaddr_in *nsap = &statp->nsaddr_list[ns];
+ same_ns:
if (badns & (1 << ns)) {
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
- if (Qhook) {
+ if (statp->qhook) {
int done = 0, loops = 0;
do {
res_sendhookact act;
- act = (*Qhook)(&nsap, &buf, &buflen,
- ans, anssiz, &resplen);
+ act = (*statp->qhook)(&nsap, &buf, &buflen,
+ ans, anssiz, &resplen);
switch (act) {
case res_goahead:
done = 1;
break;
case res_nextns:
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
case res_done:
- result = resplen;
- goto and_out;
+ return (resplen);
case res_modified:
/* give the hook another try */
if (++loops < 42) /*doug adams*/
@@ -358,12 +391,12 @@ res_send(buf, buflen, ans, anssiz)
case res_error:
/*FALLTHROUGH*/
default:
- goto and_out;
+ return (-1);
}
} while (!done);
}
- Dprint(_res.options & RES_DEBUG,
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; Querying server (# %d) address = %s\n",
ns + 1, inet_ntoa(nsap->sin_addr)));
@@ -373,33 +406,53 @@ res_send(buf, buflen, ans, anssiz)
u_short len;
u_char *cp;
- /*
- * Use virtual circuit;
- * at most one attempt per server.
- */
- try = _res.retry;
+ /* Use VC; at most one attempt per server. */
+ try = statp->retry;
truncated = 0;
- if ((s < 0) || (!vc)) {
- if (s >= 0)
- res_close_internal();
- s = socket(PF_INET, SOCK_STREAM, 0);
- if (s < 0) {
+ /* Are we still talking to whom we want to talk to? */
+ if (statp->_sock >= 0 &&
+ (statp->_flags & RES_F_VC) != 0) {
+ struct sockaddr_in peer;
+ int size = sizeof(peer);
+
+ if (getpeername(statp->_sock,
+ (struct sockaddr *)&peer,
+ &size) < 0) {
+ res_nclose(statp);
+ statp->_flags &= ~RES_F_VC;
+ } else if (!cmpsock(&peer, nsap)) {
+ res_nclose(statp);
+ statp->_flags &= ~RES_F_VC;
+ }
+ }
+
+ if (statp->_sock < 0 ||
+ (statp->_flags & RES_F_VC) == 0) {
+ if (statp->_sock >= 0)
+ res_nclose(statp);
+
+ statp->_sock = socket(PF_INET,
+ SOCK_STREAM, 0);
+ if (statp->_sock < 0 ||
+ statp->_sock > highestFD) {
terrno = errno;
- Perror(stderr, "socket(vc)", errno);
- goto and_out;
+ Perror(statp, stderr,
+ "socket(vc)", errno);
+ return (-1);
}
__set_errno (0);
- if (connect(s, (struct sockaddr *)nsap,
- sizeof(struct sockaddr)) < 0) {
+ if (connect(statp->_sock,
+ (struct sockaddr *)nsap,
+ sizeof *nsap) < 0) {
terrno = errno;
- Aerror(stderr, "connect/vc",
+ Aerror(statp, stderr, "connect/vc",
errno, *nsap);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
- vc = 1;
+ statp->_flags |= RES_F_VC;
}
/*
* Send length & message
@@ -409,28 +462,30 @@ res_send(buf, buflen, ans, anssiz)
iov[0].iov_len = INT16SZ;
iov[1].iov_base = (caddr_t)buf;
iov[1].iov_len = buflen;
- if (writev(s, iov, 2) != (INT16SZ + buflen)) {
+ if (writev(statp->_sock, iov, 2) !=
+ (INT16SZ + buflen)) {
terrno = errno;
- Perror(stderr, "write failed", errno);
+ Perror(statp, stderr, "write failed", errno);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
/*
* Receive length & response
*/
-read_len:
+ read_len:
cp = ans;
len = INT16SZ;
- while ((n = read(s, (char *)cp, (int)len)) > 0) {
+ while ((n = read(statp->_sock,
+ (char *)cp, (int)len)) > 0) {
cp += n;
if ((len -= n) <= 0)
break;
}
if (n <= 0) {
terrno = errno;
- Perror(stderr, "read failed", errno);
- res_close_internal();
+ Perror(statp, stderr, "read failed", errno);
+ res_nclose(statp);
/*
* A long running process might get its TCP
* connection reset if the remote server was
@@ -442,15 +497,15 @@ read_len:
*/
if (terrno == ECONNRESET && !connreset) {
connreset = 1;
- res_close_internal();
+ res_nclose(statp);
goto same_ns;
}
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
- resplen = _getshort(ans);
+ resplen = ns_get16(ans);
if (resplen > anssiz) {
- Dprint(_res.options & RES_DEBUG,
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; response truncated\n")
);
truncated = 1;
@@ -461,23 +516,24 @@ read_len:
/*
* Undersized message.
*/
- Dprint(_res.options & RES_DEBUG,
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; undersized: %d\n", len));
terrno = EMSGSIZE;
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
cp = ans;
while (len != 0 &&
- (n = read(s, (char *)cp, (int)len)) > 0) {
+ (n = read(statp->_sock, (char *)cp, (int)len))
+ > 0) {
cp += n;
len -= n;
}
if (n <= 0) {
terrno = errno;
- Perror(stderr, "read(vc)", errno);
- res_close_internal();
+ Perror(statp, stderr, "read(vc)", errno);
+ res_nclose(statp);
goto next_ns;
}
if (truncated) {
@@ -490,10 +546,11 @@ read_len:
while (len != 0) {
char junk[PACKETSZ];
- n = ((size_t) len > sizeof(junk)
+ n = ((size_t)len > sizeof(junk)
? sizeof(junk)
: len);
- if ((n = read(s, junk, n)) > 0)
+ n = read(statp->_sock, junk, n);
+ if (n > 0)
len -= n;
else
break;
@@ -507,8 +564,8 @@ read_len:
* wait for the correct one.
*/
if (hp->id != anhp->id) {
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
(stdout, ";; old answer (unexpected):\n"),
ans, (resplen>anssiz)?anssiz:resplen);
goto read_len;
@@ -517,27 +574,34 @@ read_len:
/*
* Use datagrams.
*/
- int timeout;
+ struct timespec start, timeout, finish;
+#ifdef _LIBC
struct pollfd pfd[1];
+ int ptimeout;
+#else
+ fd_set dsmask;
+#endif
struct sockaddr_in from;
- socklen_t fromlen;
- time_t curtime;
- time_t endtime;
-
- if ((s < 0) || vc) {
- if (vc)
- res_close_internal();
- s = socket(PF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
-#if !CAN_RECONNECT
+ int fromlen, seconds;
+
+ if (statp->_sock < 0 ||
+ (statp->_flags & RES_F_VC) != 0) {
+ if ((statp->_flags & RES_F_VC) != 0)
+ res_nclose(statp);
+ statp->_sock = socket(PF_INET, SOCK_DGRAM, 0);
+ if (statp->_sock < 0 ||
+ statp->_sock > highestFD) {
+#ifndef CAN_RECONNECT
bad_dg_sock:
#endif
terrno = errno;
- Perror(stderr, "socket(dg)", errno);
- goto and_out;
+ Perror(statp, stderr,
+ "socket(dg)", errno);
+ return (-1);
}
- connected = 0;
+ statp->_flags &= ~RES_F_CONN;
}
+#ifndef CANNOT_CONNECT_DGRAM
/*
* On a 4.3BSD+ machine (client and server,
* actually), sending to a nameserver datagram
@@ -553,28 +617,29 @@ read_len:
* as we wish to receive answers from the first
* server to respond.
*/
- if (_res.nscount == 1 || (try == 0 && ns == 0)) {
+ if (statp->nscount == 1 || (try == 0 && ns == 0)) {
/*
* Connect only if we are sure we won't
* receive a response from another server.
*/
- if (!connected) {
- if (connect(s, (struct sockaddr *)nsap,
- sizeof(struct sockaddr)
- ) < 0) {
- Aerror(stderr,
+ if ((statp->_flags & RES_F_CONN) == 0) {
+ if (connect(statp->_sock,
+ (struct sockaddr *)nsap,
+ sizeof *nsap) < 0) {
+ Aerror(statp, stderr,
"connect(dg)",
errno, *nsap);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
- connected = 1;
+ statp->_flags |= RES_F_CONN;
}
- if (send(s, (char*)buf, buflen, 0) != buflen) {
- Perror(stderr, "send", errno);
+ if (send(statp->_sock, (char*)buf, buflen, 0)
+ != buflen) {
+ Perror(statp, stderr, "send", errno);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
} else {
@@ -582,90 +647,130 @@ read_len:
* Disconnect if we want to listen
* for responses from more than one server.
*/
- if (connected) {
-#if CAN_RECONNECT
+ if ((statp->_flags & RES_F_CONN) != 0) {
+#ifdef CAN_RECONNECT
struct sockaddr_in no_addr;
no_addr.sin_family = AF_INET;
no_addr.sin_addr.s_addr = INADDR_ANY;
no_addr.sin_port = 0;
- (void) connect(s,
+ (void) connect(statp->_sock,
(struct sockaddr *)
&no_addr,
- sizeof(no_addr));
+ sizeof no_addr);
#else
- int s1 = socket(PF_INET, SOCK_DGRAM,0);
+ struct sockaddr_in local_addr;
+ int len, result, s1;
+
+ len = sizeof(local_addr);
+ s1 = socket(PF_INET, SOCK_DGRAM, 0);
+ result = getsockname(statp->_sock,
+ (struct sockaddr *)&local_addr,
+ &len);
if (s1 < 0)
goto bad_dg_sock;
- (void) dup2(s1, s);
+ (void) dup2(s1, statp->_sock);
(void) close(s1);
- Dprint(_res.options & RES_DEBUG,
+ if (result == 0) {
+ /*
+ * Attempt to rebind to old
+ * port. Note connected socket
+ * has an sin_addr set.
+ */
+ local_addr.sin_addr.s_addr =
+ htonl(0);
+ (void)bind(statp->_sock,
+ (struct sockaddr *)
+ &local_addr, len);
+ }
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; new DG socket\n"))
-#endif
- connected = 0;
+#endif /* CAN_RECONNECT */
+ statp->_flags &= ~RES_F_CONN;
__set_errno (0);
}
- if (sendto(s, (char*)buf, buflen, 0,
+#endif /* !CANNOT_CONNECT_DGRAM */
+ if (sendto(statp->_sock,
+ (char*)buf, buflen, 0,
(struct sockaddr *)nsap,
- sizeof(struct sockaddr))
+ sizeof *nsap)
!= buflen) {
- Aerror(stderr, "sendto", errno, *nsap);
+ Aerror(statp, stderr, "sendto", errno, *nsap);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
+#ifndef CANNOT_CONNECT_DGRAM
+ }
+#endif /* !CANNOT_CONNECT_DGRAM */
+
+ if (statp->_sock < 0 || statp->_sock > highestFD) {
+ Perror(statp, stderr,
+ "fd out-of-bounds", EMFILE);
+ res_nclose(statp);
+ goto next_ns;
}
/*
* Wait for reply
*/
- curtime = time (NULL);
+ seconds = (statp->retrans << try);
if (try > 0)
- endtime = (_res.retrans << try) / _res.nscount;
- else {
- endtime = _res.retrans;
- if (endtime <= 0)
- endtime = 1;
- }
- endtime += curtime;
- wait:
- timeout = MAX (endtime - curtime, 0) * 1000;
-#if 0
- if (s < 0 || s >= FD_SETSIZE) {
- Perror(stderr, "s out-of-bounds", EMFILE);
- res_close_internal();
+ seconds /= statp->nscount;
+ if (seconds <= 0)
+ seconds = 1;
+
+ start = evNowTime();
+ timeout = evConsTime(seconds, 0);
+ finish = evAddTime(start, timeout);
+ wait:
+#ifdef _LIBC
+ /* Convert struct timespec in milliseconds. */
+ ptimeout = timeout.tv_sec * 1000
+ + timeout.tv_nsec / 1000000;
+
+ pfd[0].fd = statp->_sock;
+ pfd[0].events = POLLIN;
+ n = __poll (pfd, 1, ptimeout);
+#else
+ FD_ZERO(&dsmask);
+ FD_SET(statp->_sock, &dsmask);
+ n = pselect(statp->_sock + 1,
+ &dsmask, NULL, NULL,
+ &timeout, NULL);
+#endif
+ if (n == 0) {
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; timeout\n"));
+ gotsomewhere = 1;
goto next_ns;
}
-#endif
- pfd[0].fd = s;
- pfd[0].events = POLLIN;
- n = __poll(pfd, 1, timeout);
if (n < 0) {
if (errno == EINTR) {
- curtime = time (NULL);
- goto wait;
+ struct timespec now;
+
+ now = evNowTime();
+ if (evCmpTime(finish, now) >= 0) {
+ timeout = evSubTime(finish,
+ now);
+ goto wait;
+ }
}
- Perror(stderr, "poll", errno);
- res_close_internal();
- goto next_ns;
- }
- if (n == 0) {
- /*
- * timeout
- */
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; timeout\n"));
- gotsomewhere = 1;
- res_close_internal();
+#ifdef _LIBC
+ Perror(statp, stderr, "poll", errno);
+#else
+ Perror(statp, stderr, "select", errno);
+#endif
+ res_nclose(statp);
goto next_ns;
}
__set_errno (0);
fromlen = sizeof(struct sockaddr_in);
- resplen = recvfrom(s, (char*)ans, anssiz, 0,
+ resplen = recvfrom(statp->_sock, (char*)ans, anssiz,0,
(struct sockaddr *)&from, &fromlen);
if (resplen <= 0) {
- Perror(stderr, "recvfrom", errno);
- res_close_internal();
+ Perror(statp, stderr, "recvfrom", errno);
+ res_nclose(statp);
goto next_ns;
}
gotsomewhere = 1;
@@ -673,12 +778,12 @@ read_len:
/*
* Undersized message.
*/
- Dprint(_res.options & RES_DEBUG,
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; undersized: %d\n",
resplen));
terrno = EMSGSIZE;
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
}
if (hp->id != anhp->id) {
@@ -687,30 +792,28 @@ read_len:
* XXX - potential security hazard could
* be detected here.
*/
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
(stdout, ";; old answer:\n"),
ans, (resplen>anssiz)?anssiz:resplen);
- curtime = time (NULL);
goto wait;
}
-#if CHECK_SRVR_ADDR
- if (!(_res.options & RES_INSECURE1) &&
- !res_isourserver(&from)) {
+#ifdef CHECK_SRVR_ADDR
+ if (!(statp->options & RES_INSECURE1) &&
+ !res_ourserver_p(statp, &from)) {
/*
* response from wrong server? ignore it.
* XXX - potential security hazard could
* be detected here.
*/
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
(stdout, ";; not our server:\n"),
ans, (resplen>anssiz)?anssiz:resplen);
- curtime = time (NULL);
goto wait;
}
#endif
- if (!(_res.options & RES_INSECURE2) &&
+ if (!(statp->options & RES_INSECURE2) &&
!res_queriesmatch(buf, buf + buflen,
ans, ans + anssiz)) {
/*
@@ -718,43 +821,42 @@ read_len:
* XXX - potential security hazard could
* be detected here.
*/
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
(stdout, ";; wrong query name:\n"),
ans, (resplen>anssiz)?anssiz:resplen);
- curtime = time (NULL);
goto wait;
}
if (anhp->rcode == SERVFAIL ||
anhp->rcode == NOTIMP ||
anhp->rcode == REFUSED) {
- DprintQ(_res.options & RES_DEBUG,
+ DprintQ(statp->options & RES_DEBUG,
(stdout, "server rejected query:\n"),
ans, (resplen>anssiz)?anssiz:resplen);
badns |= (1 << ns);
- res_close_internal();
+ res_nclose(statp);
/* don't retry if called from dig */
- if (!_res.pfcode)
+ if (!statp->pfcode)
goto next_ns;
}
- if (!(_res.options & RES_IGNTC) && anhp->tc) {
+ if (!(statp->options & RES_IGNTC) && anhp->tc) {
/*
* get rest of answer;
* use TCP with same server.
*/
- Dprint(_res.options & RES_DEBUG,
+ Dprint(statp->options & RES_DEBUG,
(stdout, ";; truncated answer\n"));
v_circuit = 1;
- res_close_internal();
+ res_nclose(statp);
goto same_ns;
}
} /*if vc/dg*/
- Dprint((_res.options & RES_DEBUG) ||
- ((_res.pfcode & RES_PRF_REPLY) &&
- (_res.pfcode & RES_PRF_HEAD1)),
+ Dprint((statp->options & RES_DEBUG) ||
+ ((statp->pfcode & RES_PRF_REPLY) &&
+ (statp->pfcode & RES_PRF_HEAD1)),
(stdout, ";; got answer:\n"));
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
+ DprintQ((statp->options & RES_DEBUG) ||
+ (statp->pfcode & RES_PRF_REPLY),
(stdout, ""),
ans, (resplen>anssiz)?anssiz:resplen);
/*
@@ -765,25 +867,25 @@ read_len:
* or if we haven't been asked to keep a socket open,
* close the socket.
*/
- if ((v_circuit && (!(_res.options & RES_USEVC) || ns != 0)) ||
- !(_res.options & RES_STAYOPEN)) {
- res_close_internal();
+ if ((v_circuit && (!(statp->options & RES_USEVC) || ns != 0)) ||
+ !(statp->options & RES_STAYOPEN)) {
+ res_nclose(statp);
}
- if (Rhook) {
+ if (statp->rhook) {
int done = 0, loops = 0;
do {
res_sendhookact act;
- act = (*Rhook)(nsap, buf, buflen,
- ans, anssiz, &resplen);
+ act = (*statp->rhook)(nsap, buf, buflen,
+ ans, anssiz, &resplen);
switch (act) {
case res_goahead:
case res_done:
done = 1;
break;
case res_nextns:
- res_close_internal();
+ res_nclose(statp);
goto next_ns;
case res_modified:
/* give the hook another try */
@@ -793,29 +895,24 @@ read_len:
case res_error:
/*FALLTHROUGH*/
default:
- goto and_out;
+ return (-1);
}
} while (!done);
}
- result = resplen;
- goto and_out;
- next_ns: ;
+ return (resplen);
+ next_ns: ;
} /*foreach ns*/
} /*foreach retry*/
- res_close_internal();
+ res_nclose(statp);
if (!v_circuit) {
if (!gotsomewhere)
- __set_errno (ECONNREFUSED); /* no nameservers found */
+ __set_errno (ECONNREFUSED); /* no nameservers found */
else
- __set_errno (ETIMEDOUT); /* no answer obtained */
+ __set_errno (ETIMEDOUT); /* no answer obtained */
} else
__set_errno (terrno);
-
- and_out:
- __libc_lock_unlock (lock);
-
- return result;
+ return (-1);
}
/*
@@ -825,44 +922,46 @@ read_len:
*
* This routine is not expected to be user visible.
*/
-static void
-res_close_internal()
-{
- if (s >= 0) {
- (void) close(s);
- s = -1;
- connected = 0;
- vc = 0;
+void
+res_nclose(res_state statp) {
+ if (statp->_sock >= 0) {
+ (void) close(statp->_sock);
+ statp->_sock = -1;
+ statp->_flags &= ~(RES_F_VC | RES_F_CONN);
}
}
-void
-res_close ()
-{
- __libc_lock_lock (lock);
- res_close_internal ();
- __libc_lock_unlock (lock);
+/* Private */
+static int
+cmpsock(struct sockaddr_in *a1, struct sockaddr_in *a2) {
+ return ((a1->sin_family == a2->sin_family) &&
+ (a1->sin_port == a2->sin_port) &&
+ (a1->sin_addr.s_addr == a2->sin_addr.s_addr));
}
-#ifdef ultrix
-/* ultrix 4.0 had some icky packaging in its libc.a. alias for it here.
- * there is more gunk of this kind over in res_debug.c.
- */
-
-void
-_res_close()
+#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)
{
- res_close();
-}
+ struct timeval tv, *tvp;
+ sigset_t sigs;
+ int n;
-#undef res_send
-int
-res_send(buf, buflen, ans, anssiz)
- const u_char *buf;
- int buflen;
- u_char *ans;
- int anssiz;
-{
- return (__res_send(buf, buflen, ans, anssiz));
+ 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 /* Ultrix 4.0 hackery */
+#endif