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authorUlrich Drepper <drepper@redhat.com>2002-10-17 21:51:21 +0000
committerUlrich Drepper <drepper@redhat.com>2002-10-17 21:51:21 +0000
commit0420d8885a4889dca3b874c934fd5f42f2e99e5f (patch)
treedd8aecefe9a5f21d26df11cbc7f9c1dc6f2f5fd9 /resolv/res_send.c
parentd025fe269abcab6903b3973d193a8678228301e8 (diff)
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Update.
2002-10-15 Jakub Jelinek <jakub@redhat.com> * include/resolv.h (__libc_res_nquery, __libc_res_nsearch, __libc_res_nsend): New prototypes. * resolv/res_query.c (QUERYSIZE): Define. (__libc_res_nquery): Renamed from res_nquery. Added answerp argument. Allocate only QUERYSIZE bytes first, if res_nmkquery fails use MAXPACKET buffer. Call __libc_res_nsend instead of res_nsend, pass answerp. (res_nquery): Changed into wrapper around __libc_res_nquery. (__libc_res_nsearch): Renamed from res_nsearch. Added answerp argument. Call __libc_res_nquerydomain and __libc_res_nquery instead of the non-__libc_ variants, pass them answerp. (res_nsearch): Changed into wrapper around __libc_res_nsearch. (__libc_res_nquerydomain): Renamed from res_nquerydomain. Added answerp argument. Call __libc_res_nquery instead of res_nquery, pass answerp. (res_nquerydomain): Changed into wrapper around __libc_res_nquerydomain. * resolv/res_send.c: Include sys/ioctl.h. (MAXPACKET): Define. (send_vc): Change arguments. Reallocate answer buffer if it is too small. (send_dg): Likewise. (__libc_res_nsend): Renamed from res_nsend. Added ansp argument. Reallocate answer buffer if it is too small and hooks are in use. Adjust calls to send_vc and send_dg. (res_nsend): Changed into wrapper around __libc_res_nsend. * resolv/nss_dns/dns-host.c (_nss_dns_gethostbyname2_r): Allocate just 1K answer buffer on the stack, use __libc_res_nsearch instead of res_nsearch. (_nss_dns_gethostbyaddr_r): Similarly with __libc_res_nquery. * resolv/nss_dns/dns-network.c (_nss_dns_getnetbyaddr_r): Likewise. (_nss_dns_getnetbyname_r): Similarly with __libc_res_nsearch. * resolv/gethnamaddr.c (gethostbyname2): Likewise. (gethostbyaddr): Similarly with __libc_res_nquery. * resolv/Versions (libresolv): Export __libc_res_nquery and __libc_res_nsearch at GLIBC_PRIVATE.
Diffstat (limited to 'resolv/res_send.c')
-rw-r--r--resolv/res_send.c96
1 files changed, 78 insertions, 18 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c
index a163d06..d237c9a 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -85,6 +85,7 @@ static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixi
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
+#include <sys/ioctl.h>
#include <errno.h>
#include <netdb.h>
@@ -95,6 +96,12 @@ static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixi
#include <string.h>
#include <unistd.h>
+#if PACKETSZ > 65536
+#define MAXPACKET PACKETSZ
+#else
+#define MAXPACKET 65536
+#endif
+
#ifndef _LIBC
#include <isc/eventlib.h>
#else
@@ -193,10 +200,10 @@ static const int highestFD = FD_SETSIZE - 1;
/* Forward. */
static int send_vc(res_state, const u_char *, int,
- u_char *, int, int *, int);
+ u_char **, int *, int *, int, u_char **);
static int send_dg(res_state, const u_char *, int,
- u_char *, int, int *, int,
- int *, int *);
+ u_char **, int *, int *, int,
+ int *, int *, u_char **);
#ifdef DEBUG
static void Aerror(const res_state, FILE *, const char *, int,
struct sockaddr_in);
@@ -371,8 +378,8 @@ res_queriesmatch(const u_char *buf1, const u_char *eom1,
}
int
-res_nsend(res_state statp,
- const u_char *buf, int buflen, u_char *ans, int anssiz)
+__libc_res_nsend(res_state statp, const u_char *buf, int buflen,
+ u_char *ans, int anssiz, u_char **ansp)
{
int gotsomewhere, terrno, try, v_circuit, resplen, ns, n;
@@ -380,10 +387,22 @@ res_nsend(res_state statp,
__set_errno (ESRCH);
return (-1);
}
+
if (anssiz < HFIXEDSZ) {
__set_errno (EINVAL);
return (-1);
}
+
+ if ((statp->qhook || statp->rhook) && anssiz < MAXPACKET && ansp) {
+ u_char *buf = malloc (MAXPACKET);
+ if (buf == NULL)
+ return (-1);
+ memcpy (buf, ans, HFIXEDSZ);
+ *ansp = buf;
+ ans = buf;
+ anssiz = MAXPACKET;
+ }
+
DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
(stdout, ";; res_send()\n"), buf, buflen);
v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
@@ -578,8 +597,8 @@ res_nsend(res_state statp,
if (v_circuit) {
/* Use VC; at most one attempt per server. */
try = statp->retry;
- n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
- ns);
+ n = send_vc(statp, buf, buflen, &ans, &anssiz, &terrno,
+ ns, ansp);
if (n < 0)
return (-1);
if (n == 0)
@@ -587,8 +606,8 @@ res_nsend(res_state statp,
resplen = n;
} else {
/* Use datagrams. */
- n = send_dg(statp, buf, buflen, ans, anssiz, &terrno,
- ns, &v_circuit, &gotsomewhere);
+ n = send_dg(statp, buf, buflen, &ans, &anssiz, &terrno,
+ ns, &v_circuit, &gotsomewhere, ansp);
if (n < 0)
return (-1);
if (n == 0)
@@ -667,14 +686,23 @@ res_nsend(res_state statp,
return (-1);
}
+int
+res_nsend(res_state statp,
+ const u_char *buf, int buflen, u_char *ans, int anssiz)
+{
+ return __libc_res_nsend(statp, buf, buflen, ans, anssiz, NULL);
+}
+
/* Private */
static int
send_vc(res_state statp,
- const u_char *buf, int buflen, u_char *ans, int anssiz,
- int *terrno, int ns)
+ const u_char *buf, int buflen, u_char **ansp, int *anssizp,
+ int *terrno, int ns, u_char **anscp)
{
const HEADER *hp = (HEADER *) buf;
+ u_char *ans = *ansp;
+ int anssiz = *anssizp;
HEADER *anhp = (HEADER *) ans;
#ifdef _LIBC
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
@@ -782,11 +810,26 @@ send_vc(res_state statp,
}
resplen = ns_get16(ans);
if (resplen > anssiz) {
- Dprint(statp->options & RES_DEBUG,
- (stdout, ";; response truncated\n")
- );
- truncating = 1;
- len = anssiz;
+ if (anscp) {
+ ans = malloc (MAXPACKET);
+ if (ans == NULL) {
+ *terrno = ENOMEM;
+ res_nclose(statp);
+ return (0);
+ }
+ anssiz = MAXPACKET;
+ *anssizp = MAXPACKET;
+ *ansp = ans;
+ *anscp = ans;
+ anhp = (HEADER *) ans;
+ len = resplen;
+ } else {
+ Dprint(statp->options & RES_DEBUG,
+ (stdout, ";; response truncated\n")
+ );
+ truncating = 1;
+ len = anssiz;
+ }
} else
len = resplen;
if (len < HFIXEDSZ) {
@@ -851,10 +894,12 @@ send_vc(res_state statp,
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 u_char *buf, int buflen, u_char **ansp, int *anssizp,
+ int *terrno, int ns, int *v_circuit, int *gotsomewhere, u_char **anscp)
{
const HEADER *hp = (HEADER *) buf;
+ u_char *ans = *ansp;
+ int anssiz = *anssizp;
HEADER *anhp = (HEADER *) ans;
#ifdef _LIBC
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
@@ -992,6 +1037,21 @@ send_dg(res_state statp,
#else
fromlen = sizeof(struct sockaddr_in);
#endif
+ if (anssiz < MAXPACKET
+ && anscp
+ && (ioctl (s, FIONREAD, &resplen) < 0
+ || anssiz < resplen)) {
+ ans = malloc (MAXPACKET);
+ if (ans == NULL)
+ ans = *ansp;
+ else {
+ anssiz = MAXPACKET;
+ *anssizp = MAXPACKET;
+ *ansp = ans;
+ *anscp = ans;
+ anhp = (HEADER *) ans;
+ }
+ }
resplen = recvfrom(s, (char*)ans, anssiz,0,
(struct sockaddr *)&from, &fromlen);
if (resplen <= 0) {