allocate 64K recieve buffer for DNS responses.

1 files changed, 22 insertions, 15 deletions

diff --git a/src/lib/libc/net/getnetnamadr.c b/src/lib/libc/net/getnetnamadr.c
index 44810337bd..abbfdbd64c 100644
--- a/src/lib/libc/net/getnetnamadr.c
+++ b/src/lib/libc/net/getnetnamadr.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: getnetnamadr.c,v 1.17 2002/07/25 21:13:45 deraadt Exp $       */
+/*      $OpenBSD: getnetnamadr.c,v 1.18 2002/08/27 08:53:13 itojun Exp $        */
 
 /*
  * Copyright (c) 1997, Jason Downs.  All rights reserved.
@@ -77,7 +77,7 @@ static char sccsid[] = "@(#)getnetbyaddr.c	8.1 (Berkeley) 6/4/93";
 static char sccsid_[] = "from getnetnamadr.c    1.4 (Coimbra) 93/06/03";
 static char rcsid[] = "$From: getnetnamadr.c,v 8.7 1996/08/05 08:31:35 vixie Exp $";
 #else
-static char rcsid[] = "$OpenBSD: getnetnamadr.c,v 1.17 2002/07/25 21:13:45 deraadt Exp $";
+static char rcsid[] = "$OpenBSD: getnetnamadr.c,v 1.18 2002/08/27 08:53:13 itojun Exp $";
 #endif
 #endif /* LIBC_SCCS and not lint */
 
@@ -94,6 +94,7 @@ static char rcsid[] = "$OpenBSD: getnetnamadr.c,v 1.17 2002/07/25 21:13:45 deraa
 #include <ctype.h>
 #include <errno.h>
 #include <string.h>
+#include <stdlib.h>
 
 extern int h_errno;
 
@@ -106,11 +107,7 @@ int _hokchar(const char *);
 #define BYNAME 1
 #define MAXALIASES      35
 
-#if PACKETSZ > 1024
-#define MAXPACKET       PACKETSZ
-#else
-#define MAXPACKET       1024
-#endif
+#define MAXPACKET       (64*1024)
 
 typedef union {
         HEADER  hdr;
@@ -252,7 +249,7 @@ getnetbyaddr(net, net_type)
 {
         unsigned int netbr[4];
         int nn, anslen;
-        querybuf buf;
+        querybuf *buf;
         char qbuf[MAXDNAME];
         in_addr_t net2;
         struct netent *net_entry = NULL;
@@ -300,16 +297,21 @@ getnetbyaddr(net, net_type)
                                     netbr[3], netbr[2], netbr[1], netbr[0]);
                                 break;
                         }
-                        anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)&buf,
-                            sizeof(buf));
+                        buf = malloc(sizeof(*buf));
+                        if (buf == NULL)
+                                break;
+                        anslen = res_query(qbuf, C_IN, T_PTR, buf->buf,
+                            sizeof(buf->buf));
                         if (anslen < 0) {
+                                free(buf);
 #ifdef DEBUG
                                 if (_res.options & RES_DEBUG)
                                         printf("res_query failed\n");
 #endif
                                 break;
                         }
-                        net_entry = getnetanswer(&buf, anslen, BYADDR);
+                        net_entry = getnetanswer(buf, anslen, BYADDR);
+                        free(buf);
                         if (net_entry != NULL) {
                                 unsigned u_net = net;   /* maybe net should be unsigned ? */
 
@@ -336,7 +338,7 @@ getnetbyname(net)
         register const char *net;
 {
         int anslen;
-        querybuf buf;
+        querybuf *buf;
         char qbuf[MAXDNAME];
         struct netent *net_entry = NULL;
         char lookups[MAXDNSLUS];
@@ -358,16 +360,21 @@ getnetbyname(net)
 #endif  /* YP */
                 case 'b':
                         strlcpy(qbuf, net, sizeof qbuf);
-                        anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)&buf,
-                            sizeof(buf));
+                        buf = malloc(sizeof(*buf));
+                        if (buf == NULL)
+                                break;
+                        anslen = res_search(qbuf, C_IN, T_PTR, buf->buf,
+                            sizeof(buf->buf));
                         if (anslen < 0) {
+                                free(buf);
 #ifdef DEBUG
                                 if (_res.options & RES_DEBUG)
                                         printf("res_query failed\n");
 #endif
                                 break;
                         }
-                        net_entry = getnetanswer(&buf, anslen, BYNAME);
+                        net_entry = getnetanswer(buf, anslen, BYNAME);
+                        free(buf);
                         if (net_entry != NULL)
                                 return (net_entry);
                         break;