On tor, 2007-12-06 at 11:53 -0800, Stephen Hemminger wrote:
> On Tue, 4 Dec 2007 14:58:18 +0100
> Andreas Henriksson <[EMAIL PROTECTED]> wrote:
>
> > Suggested patch for allowing netmask to be specified in dotted quad format.
> > See http://bugs.debian.org/357172
> >
> > (Known problem: this will not prevent some invalid syntaxes,
> > ie. "255.0.255.0" will be treated as "255.255.255.0")
> >
> > Comments? Suggestions? Improvements?
>
> Fix the bug you mentioned?
>
> [... snip example code ...]
Updated patch, added your netmask validation code but without the check
that made 0.0.0.0 (default) and 255.255.255.255 (one address) invalid
netmasks as they are permitted in CIDR format.
Signed-off-by: Andreas Henriksson <[EMAIL PROTECTED]>
diff --git a/lib/utils.c b/lib/utils.c
index 4c42dfd..b4a6125 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -47,6 +47,41 @@ int get_integer(int *val, const char *arg, int base)
return 0;
}
+/* a valid netmask must be 2^n - 1 (n = 1..31) */
+static int is_valid_netmask(const inet_prefix *addr)
+{
+ uint32_t host;
+
+ if (addr->family != AF_INET)
+ return 0;
+
+ host = ~ntohl(addr->data[0]);
+
+ return (host & (host + 1)) == 0;
+}
+
+static int get_netmask(unsigned *val, const char *arg, int base)
+{
+ inet_prefix addr;
+
+ if (!get_unsigned(val, arg, base))
+ return 0;
+
+ /* try coverting dotted quad to CIDR */
+ if (!get_addr_1(&addr, arg, AF_INET)) {
+ u_int32_t mask;
+
+ *val=0;
+ for (mask = addr.data[0]; mask; mask >>= 1)
+ (*val)++;
+
+ if (is_valid_netmask(&addr))
+ return 0;
+ }
+
+ return -1;
+}
+
int get_unsigned(unsigned *val, const char *arg, int base)
{
unsigned long res;
@@ -304,7 +339,8 @@ int get_prefix_1(inet_prefix *dst, char *arg, int family)
dst->bitlen = 32;
}
if (slash) {
- if (get_unsigned(&plen, slash+1, 0) || plen >
dst->bitlen) {
+ if (get_netmask(&plen, slash+1, 0)
+ || plen > dst->bitlen) {
err = -1;
goto done;
}
--
Regards,
Andreas Henriksson
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