diff options
| author |   itojun <itojun@openbsd.org> | 2002-05-24 09:15:29 +0000 |
|---|---|---|
| committer | itojun <itojun@openbsd.org> | 2002-05-24 09:15:29 +0000 |
| commit | a89bef5bc05152644e797823d1eb2b7a04ffeeeb (patch) | |
| tree | 2cba1f5d4ebd125cc891c1adb1113b80227240f4 | |
| parent | Protect biodone with splbio. (diff) | |
| download | wireguard-openbsd-a89bef5bc05152644e797823d1eb2b7a04ffeeeb.tar.xz wireguard-openbsd-a89bef5bc05152644e797823d1eb2b7a04ffeeeb.zip | |
make a strict check before sending FQDN node information reply. sync w/kame
| -rw-r--r-- | sys/netinet6/icmp6.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/sys/netinet6/icmp6.c b/sys/netinet6/icmp6.c index 2b98dde2706..df4bf9f2574 100644 --- a/sys/netinet6/icmp6.c +++ b/sys/netinet6/icmp6.c @@ -1,4 +1,4 @@ -/* $OpenBSD: icmp6.c,v 1.54 2002/03/14 01:27:11 millert Exp $ */ +/* $OpenBSD: icmp6.c,v 1.55 2002/05/24 09:15:29 itojun Exp $ */ /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ /* @@ -1537,6 +1537,11 @@ ni6_input(m, off) } #undef hostnamelen +#define isupper(x) ('A' <= (x) && (x) <= 'Z') +#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) +#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) +#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) + /* * make a mbuf with DNS-encoded string. no compression support. * @@ -1614,8 +1619,17 @@ ni6_nametodns(name, namelen, old) if (i <= 0 || i >= 64) goto fail; *cp++ = i; - bcopy(p, cp, i); - cp += i; + if (!isalpha(p[0]) || !isalnum(p[i - 1])) + goto fail; + while (i > 0) { + if (!isalnum(*p) && *p != '-') + goto fail; + if (isupper(*p)) + *cp++ = tolower(*p++); + else + *cp++ = *p++; + i--; + } p = q; if (p < name + namelen && *p == '.') p++; |