[src/netbsd-1-6]: src/dist/bind/lib/irs Pull up revision 1.2 (requested by it...

[lukem <lukem%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0e3fa18a3920
branches:  netbsd-1-6
changeset: 528199:0e3fa18a3920
user:      lukem <lukem%NetBSD.org@localhost>
date:      Fri Jun 28 11:47:00 2002 +0000

description:
Pull up revision 1.2 (requested by itojun in ticket #387):
Update to BIND 8.3.3.  Fixes buffer overrun in resolver code.

diffstat:

 dist/bind/lib/irs/gai_strerror.c |  119 ++++++++++++++++++++++++++------------
 1 files changed, 80 insertions(+), 39 deletions(-)

diffs (131 lines):

diff -r 06452765ebe5 -r 0e3fa18a3920 dist/bind/lib/irs/gai_strerror.c
--- a/dist/bind/lib/irs/gai_strerror.c  Fri Jun 28 11:46:52 2002 +0000
+++ b/dist/bind/lib/irs/gai_strerror.c  Fri Jun 28 11:47:00 2002 +0000
@@ -1,47 +1,88 @@
-/*     $NetBSD: gai_strerror.c,v 1.1.1.1 1999/11/20 18:54:08 veego Exp $       */
+/*     $NetBSD: gai_strerror.c,v 1.1.1.1.10.1 2002/06/28 11:47:00 lukem Exp $  */
 
 /*
-%%% copyright-cmetz-97
-This software is Copyright 1997-1998 by Craig Metz, All Rights Reserved.
-The Inner Net License Version 2 applies to this software.
-You should have received a copy of the license with this software. If
-you didn't get a copy, you may request one from <license%inner.net@localhost>.
-
-*/
+ * Copyright (c) 2001 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
 
 #include <port_before.h>
 #include <netdb.h>
-#include <errno.h>
 #include <port_after.h>
 
-char *
-gai_strerror(int errnum) {
-       switch(errnum) {
-       case 0:
-               return "no error";
-       case EAI_BADFLAGS:
-               return "invalid value for ai_flags";
-       case EAI_NONAME:
-               return "name or service is not known";
-       case EAI_AGAIN:
-               return "temporary failure in name resolution";
-       case EAI_FAIL:
-               return "non-recoverable failure in name resolution";
-       case EAI_NODATA:
-               return "no address associated with name";
-       case EAI_FAMILY:
-               return "ai_family not supported";
-       case EAI_SOCKTYPE:
-               return "ai_socktype not supported";
-       case EAI_SERVICE:
-               return "service not supported for ai_socktype";
-       case EAI_ADDRFAMILY:
-               return "address family for name not supported";
-       case EAI_MEMORY:
-               return "memory allocation failure";
-       case EAI_SYSTEM:
-               return "system error";
-       default:
-               return "unknown error";
-       };
+#ifdef DO_PTHREADS
+#include <pthread.h>
+#include <stdlib.h>
+#endif
+
+static const char *gai_errlist[] = {
+       "no error",
+       "address family not supported for name",/* EAI_ADDRFAMILY */
+       "temporary failure",                    /* EAI_AGAIN */
+       "invalid flags",                        /* EAI_BADFLAGS */
+       "permanent failure",                    /* EAI_FAIL */
+       "address family not supported",         /* EAI_FAMILY */
+       "memory failure",                       /* EAI_MEMORY */
+       "no address",                           /* EAI_NODATA */
+       "unknown name or service",              /* EAI_NONAME */
+       "service not supported for socktype",   /* EAI_SERVICE */
+       "socktype not supported",               /* EAI_SOCKTYPE */
+       "system failure",                       /* EAI_SYSTEM */
+       "bad hints",                            /* EAI_BADHINTS */
+       "bad protocol",                         /* EAI_PROTOCOL */
+
+       "unknown error"                         /* Must be last. */
+};
+
+static const int gai_nerr = (sizeof(gai_errlist)/sizeof(*gai_errlist));
+
+#define EAI_BUFSIZE 128
+
+const char *
+gai_strerror(int ecode) {
+#ifndef DO_PTHREADS
+       static char buf[EAI_BUFSIZE];
+#else  /* DO_PTHREADS */
+       static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+       static pthread_key_t key;
+       static int once = 0;
+       char *buf;
+#endif
+
+       if (ecode >= 0 && ecode < (gai_nerr - 1))
+               return (gai_errlist[ecode]);
+
+#ifdef DO_PTHREADS
+        if (!once) {
+                pthread_mutex_lock(&lock);
+                if (!once++)
+                        pthread_key_create(&key, free);
+                pthread_mutex_unlock(&lock);
+        }
+
+       buf = pthread_getspecific(key);
+        if (buf == NULL) {
+               buf = malloc(EAI_BUFSIZE);
+                if (buf == NULL)
+                        return ("unknown error");
+                pthread_setspecific(key, buf);
+        }
+#endif
+       /* 
+        * XXX This really should be snprintf(buf, EAI_BUFSIZE, ...).
+        * It is safe until message catalogs are used.
+        */
+       sprintf(buf, "%s: %d", gai_errlist[gai_nerr - 1], ecode);
+       return (buf);
 }