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-rw-r--r--libc/inet/resolv.c47
1 files changed, 27 insertions, 20 deletions
diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
index 01e8edf2d..752bf7fc1 100644
--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -674,6 +674,7 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
char *dns, *lookup = malloc(MAXDNAME);
int variant = -1;
struct sockaddr_in sa;
+ int local_ns, local_id;
#ifdef __UCLIBC_HAS_IPV6__
int v6;
struct sockaddr_in6 sa6;
@@ -686,10 +687,14 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
DPRINTF("Looking up type %d answer for '%s'\n", type, name);
+ /* Mess with globals while under lock */
LOCK;
- ns %= nscount;
+ local_ns = ns;
+ local_id = id;
UNLOCK;
+ local_ns %= nscount;
+
while (retries < MAX_RETRIES) {
if (fd != -1)
close(fd);
@@ -698,13 +703,10 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
memset(&h, 0, sizeof(h));
- /* Mess with globals while under lock */
- LOCK;
- ++id;
- id &= 0xffff;
- h.id = id;
- dns = nsip[ns];
- UNLOCK;
+ ++local_id;
+ local_id &= 0xffff;
+ h.id = local_id;
+ dns = nsip[local_ns];
h.qdcount = 1;
h.rd = 1;
@@ -802,13 +804,10 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
DPRINTF("id = %d, qr = %d\n", h.id, h.qr);
- LOCK;
- if ((h.id != id) || (!h.qr)) {
- UNLOCK;
+ if ((h.id != local_id) || (!h.qr)) {
/* unsolicited */
goto again;
}
- UNLOCK;
DPRINTF("Got response %s\n", "(i think)!");
@@ -861,6 +860,13 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
else
free(packet);
free(lookup);
+
+ /* Mess with globals while under lock */
+ LOCK;
+ ns = local_ns;
+ id = local_id;
+ UNLOCK;
+
return (len); /* success! */
tryall:
@@ -868,12 +874,10 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
otherwise return with error */
{
variant = -1;
- LOCK;
- ns = (ns + 1) % nscount;
- if (ns == 0)
+ local_ns = (local_ns + 1) % nscount;
+ if (local_ns == 0)
retries++;
- UNLOCK;
continue;
}
@@ -890,12 +894,10 @@ int __dns_lookup(const char *name, int type, int nscount, char **nsip,
variant++;
} else {
/* next server, first search */
- LOCK;
- ns = (ns + 1) % nscount;
- if (ns == 0)
+ local_ns = (local_ns + 1) % nscount;
+ if (local_ns == 0)
retries++;
- UNLOCK;
variant = -1;
}
}
@@ -909,6 +911,11 @@ fail:
if (packet)
free(packet);
h_errno = NETDB_INTERNAL;
+ /* Mess with globals while under lock */
+ LOCK;
+ ns = local_ns;
+ id = local_id;
+ UNLOCK;
return -1;
}
#endif