Update our stub resolver to final version of libbind.

Obtained from:	ISC

1 files changed, 63 insertions, 6 deletions

diff --git a/lib/libc/resolv/res_init.c b/lib/libc/resolv/res_init.c
index 5193c1d..b5444ef 100644
--- a/lib/libc/resolv/res_init.c
+++ b/lib/libc/resolv/res_init.c
@@ -66,7 +66,7 @@
 
 #if defined(LIBC_SCCS) && !defined(lint)
 static const char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
-static const char rcsid[] = "$Id: res_init.c,v 1.16.18.7 2007/07/09 01:52:58 marka Exp $";
+static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
 #endif /* LIBC_SCCS and not lint */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
@@ -91,6 +91,19 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include <netdb.h>
 
+#ifndef HAVE_MD5
+# include "../dst/md5.h"
+#else
+# ifdef SOLARIS2
+#  include <sys/md5.h>
+# elif _LIBC
+# include <md5.h>
+# endif
+#endif
+#ifndef _MD5_H_
+# define _MD5_H_ 1	/*%< make sure we do not include rsaref md5.h file */
+#endif
+
 #include "un-namespace.h"
 
 #include "port_after.h"
@@ -178,9 +191,12 @@ __res_vinit(res_state statp, int preinit) {
 		statp->retrans = RES_TIMEOUT;
 		statp->retry = RES_DFLRETRY;
 		statp->options = RES_DEFAULT;
-		statp->id = res_randomid();
 	}
 
+	statp->_rnd = malloc(16);
+	res_rndinit(statp);
+	statp->id = res_nrandomid(statp);
+
 	memset(u, 0, sizeof(u));
 #ifdef USELOOPBACK
 	u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
@@ -715,12 +731,48 @@ net_mask(in)		/*!< XXX - should really use system's version of this  */
 }
 #endif
 
+static u_char srnd[16];
+
+void
+res_rndinit(res_state statp)
+{
+	struct timeval now;
+	u_int32_t u32;
+	u_int16_t u16;
+	u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
+
+	gettimeofday(&now, NULL);
+	u32 = now.tv_sec;
+	memcpy(rnd, &u32, 4);
+	u32 = now.tv_usec;
+	memcpy(rnd + 4, &u32, 4);
+	u32 += now.tv_sec;
+	memcpy(rnd + 8, &u32, 4);
+	u16 = getpid();
+	memcpy(rnd + 12, &u16, 2);
+}
+
 u_int
-res_randomid(void) {
+res_nrandomid(res_state statp) {
 	struct timeval now;
+	u_int16_t u16;
+	MD5_CTX ctx;
+	u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
 
 	gettimeofday(&now, NULL);
-	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
+	u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
+	memcpy(rnd + 14, &u16, 2);
+#ifndef HAVE_MD5
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, rnd, 16);
+	MD5_Final(rnd, &ctx);
+#else
+	MD5Init(&ctx);
+	MD5Update(&ctx, rnd, 16);
+	MD5Final(rnd, &ctx);
+#endif
+	memcpy(&u16, rnd + 14, 2);
+	return ((u_int) u16);
 }
 
 /*%
@@ -750,10 +802,15 @@ res_nclose(res_state statp) {
 void
 res_ndestroy(res_state statp) {
 	res_nclose(statp);
-	if (statp->_u._ext.ext != NULL)
+	if (statp->_u._ext.ext != NULL) {
 		free(statp->_u._ext.ext);
+		statp->_u._ext.ext = NULL;
+	}
+	if (statp->_rnd != NULL) {
+		free(statp->_rnd);
+		statp->_rnd = NULL;
+	}
 	statp->options &= ~RES_INIT;
-	statp->_u._ext.ext = NULL;
 }
 
 #ifndef _LIBC