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authorSzabolcs Nagy <nsz@port70.net>2014-06-06 19:20:07 +0200
committerSzabolcs Nagy <nsz@port70.net>2014-06-06 20:41:15 +0200
commit07355f503a9b0a3ab7a051e2931499a4c5898b15 (patch)
tree2807935cfeca2b4bc8335352d7b134fa5b58f0e7 /src/network
parent9ce2860fa34ede8f84b8ca5ac1746a58b171a023 (diff)
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accept trailing . and empty domain names
trailing . should be accepted in domain name strings by convention (RFC 1034), host name lookup accepts "." but rejects empty "", res_* interfaces also accept empty name following existing practice.
Diffstat (limited to 'src/network')
-rw-r--r--src/network/lookup_name.c7
-rw-r--r--src/network/res_mkquery.c13
-rw-r--r--src/network/res_querydomain.c8
3 files changed, 16 insertions, 12 deletions
diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index 68b172b4..743aa082 100644
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -14,7 +14,7 @@
static int is_valid_hostname(const char *host)
{
const unsigned char *s;
- if (strnlen(host, 254)-1 >= 253 || mbstowcs(0, host, 0) == -1) return 0;
+ if (strnlen(host, 255)-1 >= 254 || mbstowcs(0, host, 0) == -1) return 0;
for (s=(void *)host; *s>=0x80 || *s=='.' || *s=='-' || isalnum(*s); s++);
return !*s;
}
@@ -152,8 +152,9 @@ int __lookup_name(struct address buf[static MAXADDRS], char canon[static 256], c
*canon = 0;
if (name) {
- size_t l;
- if ((l = strnlen(name, 254))-1 >= 253)
+ /* reject empty name and check len so it fits into temp bufs */
+ size_t l = strnlen(name, 255);
+ if (l-1 >= 254)
return EAI_NONAME;
memcpy(canon, name, l+1);
}
diff --git a/src/network/res_mkquery.c b/src/network/res_mkquery.c
index 7c49709e..ec4568ac 100644
--- a/src/network/res_mkquery.c
+++ b/src/network/res_mkquery.c
@@ -10,13 +10,16 @@ int __res_mkquery(int op, const char *dname, int class, int type,
int id, i, j;
unsigned char q[280];
struct timespec ts;
- size_t l = strnlen(dname, 254);
+ size_t l = strnlen(dname, 255);
+ int n;
- if (l-1>=253 || buflen<18+l || op>15u || class>255u || type>255u)
+ if (l && dname[l-1]=='.') l--;
+ n = 17+l+!!l;
+ if (l>253 || buflen<n || op>15u || class>255u || type>255u)
return -1;
/* Construct query template - ID will be filled later */
- memset(q, 0, 18+l);
+ memset(q, 0, n);
q[2] = op*8 + 1;
q[5] = 1;
memcpy((char *)q+13, dname, l);
@@ -34,8 +37,8 @@ int __res_mkquery(int op, const char *dname, int class, int type,
q[0] = id/256;
q[1] = id;
- memcpy(buf, q, 18+l);
- return 18+l;
+ memcpy(buf, q, n);
+ return n;
}
weak_alias(__res_mkquery, res_mkquery);
diff --git a/src/network/res_querydomain.c b/src/network/res_querydomain.c
index 8ba31f45..727e6f6b 100644
--- a/src/network/res_querydomain.c
+++ b/src/network/res_querydomain.c
@@ -3,10 +3,10 @@
int res_querydomain(const char *name, const char *domain, int class, int type, unsigned char *dest, int len)
{
- char tmp[254];
- size_t nl = strnlen(name, 254);
- size_t dl = strnlen(domain, 254);
- if (nl+dl+1 > 253) return -1;
+ char tmp[255];
+ size_t nl = strnlen(name, 255);
+ size_t dl = strnlen(domain, 255);
+ if (nl+dl+1 > 254) return -1;
memcpy(tmp, name, nl);
tmp[nl] = '.';
memcpy(tmp+nl+1, domain, dl+1);