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authorUlrich Drepper <drepper@redhat.com>2002-05-31 07:54:02 +0000
committerUlrich Drepper <drepper@redhat.com>2002-05-31 07:54:02 +0000
commitb64e1566263764ddc1173cfa3f94d0ef92ae2883 (patch)
tree265ef2e36521a7a8382a709b1f817fa51c0464e3 /resolv
parent2afdb78308bba863d275cbae0b22c51a07826af7 (diff)
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Update.
2002-05-21 Jakub Jelinek <jakub@redhat.com> * resolv/resolv.h (struct __res_state): Remove unused nstimes. Add nsmap. * resolv/res_init.c (__res_vinit): Initialize nsmap array. Remove nstimes setting. (res_nclose): Check all MAXNS nameservers with non-NULL nsaddrs. * resolv/res_send.c (res_nsend): Don't close unconditionally if there is mix of IPv6 and IPv4 nameservers. Use nsmap array to find free slots and preserve nameserver ordering. Fix RES_ROTATE.
Diffstat (limited to 'resolv')
-rw-r--r--resolv/res_init.c16
-rw-r--r--resolv/res_send.c101
-rw-r--r--resolv/resolv.h2
3 files changed, 70 insertions, 49 deletions
diff --git a/resolv/res_init.c b/resolv/res_init.c
index bb66b02b6c..f5613825bf 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -182,8 +182,10 @@ __res_vinit(res_state statp, int preinit) {
statp->_u._ext.nscount = 0;
#ifdef _LIBC
statp->_u._ext.nscount6 = 0;
- for (n = 0; n < MAXNS; n++)
- statp->_u._ext.nsaddrs[n] = NULL;
+ for (n = 0; n < MAXNS; n++) {
+ statp->_u._ext.nsaddrs[n] = NULL;
+ statp->_u._ext.nsmap[n] = MAXNS;
+ }
#endif
/* Allow user to override the local domain definition */
@@ -323,8 +325,8 @@ __res_vinit(res_state statp, int preinit) {
sa6->sin6_family = AF_INET6;
sa6->sin6_port = htons(NAMESERVER_PORT);
statp->_u._ext.nsaddrs[nservall] = sa6;
- statp->_u._ext.nstimes[nservall] = RES_MAXTIME;
statp->_u._ext.nssocks[nservall] = -1;
+ statp->_u._ext.nsmap[nservall] = MAXNS + 1;
nservall++;
}
}
@@ -537,16 +539,14 @@ res_nclose(res_state statp) {
statp->_flags &= ~(RES_F_VC | RES_F_CONN);
}
#ifdef _LIBC
- for (ns = 0; ns < statp->_u._ext.nscount + statp->_u._ext.nscount6;
- ns++)
+ for (ns = 0; ns < MAXNS; ns++)
#else
for (ns = 0; ns < statp->_u._ext.nscount; ns++)
#endif
- {
- if (statp->_u._ext.nssocks[ns] != -1) {
+ if (statp->_u._ext.nsaddrs[ns]
+ && statp->_u._ext.nssocks[ns] != -1) {
(void) __close(statp->_u._ext.nssocks[ns]);
statp->_u._ext.nssocks[ns] = -1;
}
- }
statp->_u._ext.nsinit = 0;
}
diff --git a/resolv/res_send.c b/resolv/res_send.c
index 751a5506a1..a163d06a0a 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -400,12 +400,15 @@ res_nsend(res_state statp,
if (EXT(statp).nscount != statp->nscount)
needclose++;
else
- for (ns = 0; ns < statp->nscount; ns++)
#ifdef _LIBC
- if (!sock_eq((struct sockaddr_in6 *)
- &statp->nsaddr_list[ns],
- EXT(statp).nsaddrs[ns]))
+ for (ns = 0; ns < MAXNS; ns++) {
+ unsigned int map = EXT(statp).nsmap[ns];
+ if (map < MAXNS
+ && !sock_eq((struct sockaddr_in6 *)
+ &statp->nsaddr_list[map],
+ EXT(statp).nsaddrs[ns]))
#else
+ for (ns = 0; ns < statp->nscount; ns++) {
if (!sock_eq(&statp->nsaddr_list[ns],
&EXT(statp).nsaddrs[ns]))
#endif
@@ -413,6 +416,7 @@ res_nsend(res_state statp,
needclose++;
break;
}
+ }
if (needclose)
res_nclose(statp);
}
@@ -422,20 +426,34 @@ res_nsend(res_state statp,
*/
if (EXT(statp).nsinit == 0) {
#ifdef _LIBC
- n = 0;
-#endif
- for (ns = 0; ns < statp->nscount; ns++) {
-#ifdef _LIBC
- /* find a hole */
- while ((n < MAXNS) &&
- (EXT(statp).nsaddrs[n] != NULL) &&
- (EXT(statp).nsaddrs[n]->sin6_family == AF_INET6) &&
- !IN6_IS_ADDR_V4MAPPED(
- &EXT(statp).nsaddrs[n]->sin6_addr))
- n++;
- if (n == MAXNS)
- break;
-
+ unsigned char map[MAXNS];
+
+ memset (map, MAXNS, sizeof (map));
+ for (n = 0; n < MAXNS; n++) {
+ ns = EXT(statp).nsmap[n];
+ if (ns < statp->nscount)
+ map[ns] = n;
+ else if (ns < MAXNS) {
+ free(EXT(statp).nsaddrs[n]);
+ EXT(statp).nsaddrs[n] = NULL;
+ EXT(statp).nsmap[n] = MAXNS;
+ }
+ }
+ n = statp->nscount;
+ if (statp->nscount > EXT(statp).nscount)
+ for (n = EXT(statp).nscount, ns = 0;
+ n < statp->nscount; n++) {
+ while (ns < MAXNS
+ && EXT(statp).nsmap[ns] != MAXNS)
+ ns++;
+ if (ns == MAXNS)
+ break;
+ EXT(statp).nsmap[ns] = n;
+ map[n] = ns++;
+ }
+ EXT(statp).nscount = n;
+ for (ns = 0; ns < EXT(statp).nscount; ns++) {
+ n = map[ns];
if (EXT(statp).nsaddrs[n] == NULL)
EXT(statp).nsaddrs[n] =
malloc(sizeof (struct sockaddr_in6));
@@ -443,31 +461,18 @@ res_nsend(res_state statp,
memcpy(EXT(statp).nsaddrs[n],
&statp->nsaddr_list[ns],
sizeof (struct sockaddr_in));
- EXT(statp).nstimes[n] = RES_MAXTIME;
EXT(statp).nssocks[n] = -1;
n++;
}
+ }
#else
+ for (ns = 0; ns < statp->nscount; ns++) {
EXT(statp).nsaddrs[ns] = statp->nsaddr_list[ns];
- EXT(statp).nstimes[ns] = RES_MAXTIME;
EXT(statp).nssocks[ns] = -1;
-#endif
- }
- EXT(statp).nscount = statp->nscount;
- EXT(statp).nsinit = 1;
-#ifdef _LIBC
- /* If holes left, free memory and set to NULL */
- while (n < MAXNS) {
- if ((EXT(statp).nsaddrs[n] != NULL) &&
- ((EXT(statp).nsaddrs[n]->sin6_family != AF_INET6)
- || IN6_IS_ADDR_V4MAPPED(
- &EXT(statp).nsaddrs[n]->sin6_addr))) {
- free(EXT(statp).nsaddrs[n]);
- EXT(statp).nsaddrs[n] = NULL;
- }
- n++;
}
+ EXT(statp).nscount = ns;
#endif
+ EXT(statp).nsinit = 1;
}
/*
@@ -478,12 +483,28 @@ res_nsend(res_state statp,
(statp->options & RES_BLAST) == 0) {
#ifdef _LIBC
struct sockaddr_in6 *ina;
- int lastns = statp->nscount + EXT(statp).nscount6 - 1;
+ unsigned int map;
- ina = EXT(statp).nsaddrs[0];
- for (ns = 0; ns < lastns; ns++)
- EXT(statp).nsaddrs[ns] = EXT(statp).nsaddrs[ns + 1];
- EXT(statp).nsaddrs[lastns] = ina;
+ n = 0;
+ while (n < MAXNS && EXT(statp).nsmap[n] == MAXNS)
+ n++;
+ if (n < MAXNS) {
+ ina = EXT(statp).nsaddrs[n];
+ map = EXT(statp).nsmap[n];
+ for (;;) {
+ ns = n + 1;
+ while (ns < MAXNS
+ && EXT(statp).nsmap[ns] == MAXNS)
+ ns++;
+ if (ns == MAXNS)
+ break;
+ EXT(statp).nsaddrs[n] = EXT(statp).nsaddrs[ns];
+ EXT(statp).nsmap[n] = EXT(statp).nsmap[ns];
+ n = ns;
+ }
+ EXT(statp).nsaddrs[n] = ina;
+ EXT(statp).nsmap[n] = map;
+ }
#else
struct sockaddr_in ina;
int lastns = statp->nscount - 1;
diff --git a/resolv/resolv.h b/resolv/resolv.h
index 238ea59d65..09bddb8965 100644
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -130,7 +130,7 @@ struct __res_state {
char pad[52]; /* On an i386 this means 512b total. */
struct {
u_int16_t nscount;
- u_int16_t nstimes[MAXNS]; /* ms. */
+ u_int16_t nsmap[MAXNS];
int nssocks[MAXNS];
u_int16_t nscount6;
u_int16_t nsinit;