Add interface address validation support.

Fix IPv4 CIDR regex to support one-digit mask properly.

3 files changed, 50 insertions, 3 deletions

diff --git a/src/ipaddrcheck.c b/src/ipaddrcheck.c
index 8b99b23..cc0a26b 100644
--- a/src/ipaddrcheck.c
+++ b/src/ipaddrcheck.c
@@ -47,6 +47,8 @@
 #define IS_VALID_INTF_ADDR    220
 #define IS_ANY_CIDR           230
 #define IS_ANY_SINGLE         240
+#define ALLOW_LOOPBACK        250
+#define NO_ACTION             500
 
 static const struct option options[] =
 {
@@ -71,7 +73,7 @@ static const struct option options[] =
     { "is-ipv6-multicast",     no_argument, NULL, 's' },
     { "is-ipv6-link-local",    no_argument, NULL, 't' },
     { "is-valid-intf-address", no_argument, NULL, 'u' },
-    { "legacy",                no_argument, NULL, 'w' },
+    { "allow-loopback",        no_argument, NULL, 'C' },
     { "version",               no_argument, NULL, 'z' },
     { "help",                  no_argument, NULL, '?' },
     { NULL,                    no_argument, NULL, 0   }
@@ -91,6 +93,9 @@ int main(int argc, char* argv[])
     int option_index = 0;      /* Number of the current option for getopt call */
     int optc;                  /* Option character for getopt call */
 
+    int allow_loopback = NO_LOOPBACK;    /* Allow IPv4 loopback in --is-valid-intf-address */
+
+
     /* Parse options, convert to action codes, store in array */
 
     /* Try to allocate memory for the actions array, abort if fail */
@@ -101,7 +106,7 @@ int main(int argc, char* argv[])
         return(EXIT_FAILURE);
     }
 
-    while( (optc = getopt_long(argc, argv, "acdefghijklmnoprstuzAB?", options, &option_index)) != -1 )
+    while( (optc = getopt_long(argc, argv, "acdefghijklmnoprstuzABC?", options, &option_index)) != -1 )
     {
          switch(optc)
          {
@@ -169,6 +174,10 @@ int main(int argc, char* argv[])
              case 'B':
                  action = IS_ANY_SINGLE;
                  break;
+             case 'C':
+                 allow_loopback = LOOPBACK_ALLOWED;
+                 action = NO_ACTION;
+                 break;
              case '?':
                  print_help();
                  return(0);
@@ -273,6 +282,14 @@ int main(int argc, char* argv[])
             case IS_ANY_SINGLE:
                  result = is_any_single(address_str);
                  break;
+            case IS_VALID_INTF_ADDR:
+                 printf("allow_loopback: %d\n", allow_loopback);
+                 result = is_valid_intf_address(address, address_str, allow_loopback);
+                 break;
+            case NO_ACTION:
+                 break;
+            default:
+                 break;
         }
         printf("action: %d\n", actions[action_count]);
         action_count--;
diff --git a/src/ipaddrcheck_functions.c b/src/ipaddrcheck_functions.c
index dfcdcfb..0240914 100644
--- a/src/ipaddrcheck_functions.c
+++ b/src/ipaddrcheck_functions.c
@@ -48,7 +48,7 @@ int is_ipv4_cidr(char* address_str)
     const char *error;
     int erroffset;
 
-    re = pcre_compile("^((([1-9]\\d{0,2}|0)\\.){3}([1-9]\\d{0,2}|0)(\\/([1-3][0-9]|0)))$",
+    re = pcre_compile("^((([1-9]\\d{0,2}|0)\\.){3}([1-9]\\d{0,2}|0)\\/([1-9]\\d*|0))$",
                       0, &error, &erroffset, NULL);
     rc = pcre_exec(re, NULL, address_str, strlen(address_str), 0, 0, offsets, 1);
 
@@ -443,3 +443,26 @@ int is_ipv6_link_local(CIDR *address)
     return(result);
 }
 
+/* Is it an address that can belong an interface? */
+int is_valid_intf_address(CIDR *address, char* address_str, int allow_loopback)
+{
+    int result;
+
+    if( (is_ipv4_broadcast(address) == RESULT_FAILURE) &&
+        (is_ipv4_multicast(address) == RESULT_FAILURE) &&
+        (is_ipv6_multicast(address) == RESULT_FAILURE) &&
+        ((is_ipv4_loopback(address) == RESULT_FAILURE) || (allow_loopback == LOOPBACK_ALLOWED)) &&
+        (cidr_equals(address, cidr_from_str(IPV6_LOOPBACK)) != 0) &&
+        (cidr_equals(address, cidr_from_str(IPV4_UNSPECIFIED)) != 0) &&
+        (cidr_contains(cidr_from_str(IPV4_THIS), address) != 0) &&
+        (is_any_cidr(address_str) == RESULT_SUCCESS) )
+    {
+        result = RESULT_SUCCESS;
+    }
+    else
+    {
+        result = RESULT_FAILURE;
+    }
+
+    return(result);
+}
diff --git a/src/ipaddrcheck_functions.h b/src/ipaddrcheck_functions.h
index 34bb18e..67cc410 100644
--- a/src/ipaddrcheck_functions.h
+++ b/src/ipaddrcheck_functions.h
@@ -37,11 +37,17 @@
 #define IPV4_MULTICAST "224.0.0.0/4"
 #define IPV4_LOOPBACK  "127.0.0.0/8"
 #define IPV4_LINKLOCAL "169.254.0.0/16"
+#define IPV4_UNSPECIFIED "0.0.0.0/0"
+#define IPV4_THIS        "0.0.0.0/8"
 #define IPV4_RFC1918_A "10.0.0.0/8"
 #define IPV4_RFC1918_B "172.16.0.0/12"
 #define IPV4_RFC1918_C "192.168.0.0/16"
 #define IPV6_MULTICAST "ff00::/8"
 #define IPV6_LINKLOCAL "fe80::/64"
+#define IPV6_LOOPBACK  "::1/128"
+
+#define NO_LOOPBACK      0
+#define LOOPBACK_ALLOWED 1
 
 int is_ipv4_cidr(char* address_str);
 int is_ipv4_single(char* address_str);
@@ -63,3 +69,4 @@ int is_ipv6_host(CIDR *address);
 int is_ipv6_net(CIDR *address);
 int is_ipv6_multicast(CIDR *address);
 int is_ipv6_link_local(CIDR *address);
+int is_valid_intf_address(CIDR *address, char* address_str, int allow_loopback);