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resolv: Reduce EDNS payload size to 1200 bytes [BZ #21361]

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This hardens the stub resolver against fragmentation-based attacks.
This commit is contained in:
Florian Weimer
2017-04-13 13:09:38 +02:00
parent c803cb9b24
commit e14a27723c
10 changed files with 651 additions and 13 deletions
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3
include/resolv.h
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@ -37,8 +37,6 @@ extern void res_pquery (const res_state __statp, const unsigned char *__msg,
extern int res_ourserver_p (const res_state __statp,
const struct sockaddr_in6 *__inp);
extern void __res_iclose (res_state statp, bool free_addr);
extern int __res_nopt(res_state statp, int n0, unsigned char *buf, int buflen,
int anslen);
libc_hidden_proto (__res_ninit)
libc_hidden_proto (__res_maybe_init)
libc_hidden_proto (__res_nclose)
@ -91,7 +89,6 @@ libresolv_hidden_proto (__res_nameinquery)
libresolv_hidden_proto (__res_queriesmatch)
libresolv_hidden_proto (__res_nsend)
libresolv_hidden_proto (__b64_ntop)
libresolv_hidden_proto (__res_nopt)
libresolv_hidden_proto (__dn_count_labels)
libresolv_hidden_proto (__p_secstodate)