diff options
| author |   jca <jca@openbsd.org> | 2017-02-18 19:23:05 +0000 |
|---|---|---|
| committer | jca <jca@openbsd.org> | 2017-02-18 19:23:05 +0000 |
| commit | 2aa4cd219b1fae15f061ec9753d5a6990ec2ba48 (patch) | |
| tree | 77639f64821e8dabbde640015c5277782230015d /lib/libc/asr/asr_utils.c | |
| parent | Add a regress test for the chflags problem analogous to the chmod bug (diff) | |
| download | wireguard-openbsd-2aa4cd219b1fae15f061ec9753d5a6990ec2ba48.tar.xz wireguard-openbsd-2aa4cd219b1fae15f061ec9753d5a6990ec2ba48.zip | |
Add EDNS0 support.
EDNS allows for various DNS extensions, among which UDP DNS packets size
bigger than 512 bytes. The default is still to not advertize anything.
ok eric@
Diffstat (limited to 'lib/libc/asr/asr_utils.c')
| -rw-r--r-- | lib/libc/asr/asr_utils.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/lib/libc/asr/asr_utils.c b/lib/libc/asr/asr_utils.c index 835d5dfb448..e540aae9ab6 100644 --- a/lib/libc/asr/asr_utils.c +++ b/lib/libc/asr/asr_utils.c @@ -1,4 +1,4 @@ -/* $OpenBSD: asr_utils.c,v 1.14 2017/02/17 22:24:45 eric Exp $ */ +/* $OpenBSD: asr_utils.c,v 1.15 2017/02/18 19:23:05 jca Exp $ */ /* * Copyright (c) 2009-2012 Eric Faurot <eric@faurot.net> * @@ -381,6 +381,14 @@ pack_u16(struct asr_pack *p, uint16_t v) } static int +pack_u32(struct asr_pack *p, uint32_t v) +{ + v = htonl(v); + + return (pack_data(p, &v, 4)); +} + +static int pack_dname(struct asr_pack *p, const char *dname) { /* dname compression would be nice to have here. @@ -415,6 +423,18 @@ _asr_pack_query(struct asr_pack *p, uint16_t type, uint16_t class, const char *d } int +_asr_pack_edns0(struct asr_pack *p, uint16_t pktsz) +{ + pack_dname(p, ""); /* root */ + pack_u16(p, 41); /* OPT */ + pack_u16(p, pktsz); /* UDP payload size */ + pack_u32(p, 0); /* extended RCODE and flags */ + pack_u16(p, 0); /* RDATA len */ + + return (p->err) ? (-1) : (0); +} + +int _asr_sockaddr_from_str(struct sockaddr *sa, int family, const char *str) { struct in_addr ina; |