allocate 64K recieve buffer for DNS responses.

1 files changed, 23 insertions, 15 deletions

diff --git a/src/lib/libc/net/gethostnamadr.c b/src/lib/libc/net/gethostnamadr.c
index 3ac5049e72..909ce573b7 100644
--- a/src/lib/libc/net/gethostnamadr.c
+++ b/src/lib/libc/net/gethostnamadr.c
@@ -52,7 +52,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: gethostnamadr.c,v 1.52 2002/08/22 16:35:37 itojun Exp $";
+static char rcsid[] = "$OpenBSD: gethostnamadr.c,v 1.53 2002/08/27 08:53:13 itojun Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -110,11 +110,7 @@ int _hokchar(const char *);
 static const char AskedForGot[] =
                           "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
 
-#if PACKETSZ > 1024
-#define MAXPACKET       PACKETSZ
-#else
-#define MAXPACKET       1024
-#endif
+#define MAXPACKET       (64*1024)
 
 typedef union {
         HEADER hdr;
@@ -517,7 +513,7 @@ gethostbyname2(name, af)
         const char *name;
         int af;
 {
-        querybuf buf;
+        querybuf *buf;
         register const char *cp;
         char *bp, *ep;
         int n, size, type, i;
@@ -635,15 +631,20 @@ gethostbyname2(name, af)
                         break;
 #endif
                 case 'b':
-                        if ((n = res_search(name, C_IN, type, buf.buf,
-                            sizeof(buf))) < 0) {
+                        buf = malloc(sizeof(*buf));
+                        if (buf == NULL)
+                                break;
+                        if ((n = res_search(name, C_IN, type, buf->buf,
+                            sizeof(buf->buf))) < 0) {
+                                free(buf);
 #ifdef DEBUG
                                 if (_res.options & RES_DEBUG)
                                         printf("res_search failed\n");
 #endif
                                 break;
                         }
-                        hp = getanswer(&buf, n, name, type);
+                        hp = getanswer(buf, n, name, type);
+                        free(buf);
                         break;
                 case 'f':
                         hp = _gethtbyname2(name, af);
@@ -661,7 +662,7 @@ gethostbyaddr(addr, len, af)
 {
         const u_char *uaddr = (const u_char *)addr;
         int n, size, i;
-        querybuf buf;
+        querybuf *buf;
         register struct hostent *hp;
         char qbuf[MAXDNAME+1], *qp;
         extern struct hostent *_gethtbyaddr(), *_yp_gethtbyaddr();
@@ -741,22 +742,29 @@ gethostbyaddr(addr, len, af)
                 case 'b':
                         if (af == AF_INET6)
                                 strcpy(qp, "ip6.arpa");
-                        n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf,
-                            sizeof buf.buf);
+                        buf = malloc(sizeof(*buf));
+                        if (!buf)
+                                break;
+                        n = res_query(qbuf, C_IN, T_PTR, buf->buf,
+                            sizeof(buf->buf));
                         if (n < 0 && af == AF_INET6) {
                                 strcpy(qp, "ip6.int");
                                 n = res_query(qbuf, C_IN, T_PTR,
-                                    (u_char *)buf.buf, sizeof buf.buf);
+                                    buf->buf, sizeof(buf->buf));
                         }
                         if (n < 0) {
+                                free(buf);
 #ifdef DEBUG
                                 if (_res.options & RES_DEBUG)
                                         printf("res_query failed\n");
 #endif
                                 break;
                         }
-                        if (!(hp = getanswer(&buf, n, qbuf, T_PTR)))
+                        if (!(hp = getanswer(buf, n, qbuf, T_PTR))) {
+                                free(buf);
                                 break;
+                        }
+                        free(buf);
                         hp->h_addrtype = af;
                         hp->h_length = len;
                         bcopy(addr, host_addr, len);