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Limit UDP payload size for EDNS0 to 0xffff, not use lower 16bit value.

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Obtained from:	KAME
This commit is contained in:
Hajimu UMEMOTO 2002-09-14 17:28:40 +00:00
parent d594cee0e0
commit 08c89c65eb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103320
1 changed files with 2 additions and 0 deletions
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2
lib/libc/net/res_mkquery.c
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@ -229,6 +229,8 @@ res_opt(n0, buf, buflen, anslen)
__putshort(T_OPT, cp); /* TYPE */
cp += INT16SZ;
if (anslen > 0xffff)
anslen = 0xffff; /* limit to 16bit value */
__putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
cp += INT16SZ;
*cp++ = NOERROR; /* extended RCODE */