add uh_addr_rfc1918()

[project/uhttpd.git] / utils.c

diff --git a/utils.c b/utils.c
index d2ad296..742e280 100644 (file)
--- a/utils.c
+++ b/utils.c
@@ -217,3 +217,18 @@ char *uh_split_header(char *str)
 
        return val;
 }
+
+bool uh_addr_rfc1918(struct uh_addr *addr)
+{
+       uint32_t a;
+
+       if (addr->family != AF_INET)
+               return false;
+
+       a = htonl(addr->in.s_addr);
+       return ((a >= 0x0A000000) && (a <= 0x0AFFFFFF)) ||
+              ((a >= 0xAC100000) && (a <= 0xAC1FFFFF)) ||
+              ((a >= 0xC0A80000) && (a <= 0xC0A8FFFF));
+
+       return 0;
+}