Move hostname, ip address validating functions to libglusterfs.

hostname and ip address validation functions are duplicated in several
source files. Move them to libglusterfs.

Signed-off-by: Sachidananda Urs <sac@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 2249 (Problems with hostname validation)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2249

1 files changed, 121 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 6f40e7a6420..727983d0682 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -1572,3 +1572,124 @@ strtail (char *str, const char *pattern)
 
         return NULL;
 }
+
+/* RFC 1123 & 952 */
+char 
+valid_host_name (char *address, int length)
+{
+        int i = 0;
+        char ret = 1;
+
+        if ((length > 75) || (length == 1)) {
+                ret = 0;
+                goto out;
+        }
+
+        if (!isalnum (address[length - 1])) {
+                ret = 0;
+                goto out;
+        }
+
+        for (i = 0; i < length; i++) {
+                if (!isalnum (address[i]) && (address[i] != '.')
+                    && (address[i] != '-')) {
+                        ret = 0;
+                        goto out;
+                }
+        }
+
+out:
+        return ret;
+}
+
+char
+valid_ipv4_address (char *address, int length)
+{
+        int octets = 0;
+        int value = 0;
+        char *tmp = NULL, *ptr = NULL, *prev = NULL, *endptr = NULL;
+        char ret = 1;
+
+        tmp = gf_strdup (address);
+        prev = tmp; 
+        prev = strtok_r (tmp, ".", &ptr);
+
+        while (prev != NULL) 
+        {
+                octets++;
+                value = strtol (prev, &endptr, 10);
+                if ((value > 255) || (value < 0) || (endptr != NULL)) {
+                        ret = 0;
+                        goto out;
+                }
+   
+                prev = strtok_r (NULL, ".", &ptr);
+        }
+
+        if (octets != 4) {
+                ret = 0;
+        }
+
+out:
+        GF_FREE (tmp);
+        return ret;
+}
+
+char
+valid_ipv6_address (char *address, int length)
+{
+        int hex_numbers = 0;
+        int value = 0;
+        char *tmp = NULL, *ptr = NULL, *prev = NULL, *endptr = NULL;
+        char ret = 1;
+
+        tmp = gf_strdup (address);
+        prev = strtok_r (tmp, ":", &ptr);
+
+        while (prev != NULL) 
+        {
+                hex_numbers++;
+                value = strtol (prev, &endptr, 16);
+                if ((value > 0xffff) || (value < 0)
+                    || (endptr != NULL && *endptr != '\0')) {
+                        ret = 0;
+                        goto out;
+                }
+   
+                prev = strtok_r (NULL, ":", &ptr);
+        }
+        
+        if (hex_numbers > 8) {
+                ret = 0;
+        }
+
+out:
+        GF_FREE (tmp);
+        return ret;
+}
+
+char
+valid_internet_address (char *address)
+{
+        char ret = 0;
+        int length = 0;
+
+        if (address == NULL) {
+                goto out;
+        }
+
+        length = strlen (address);
+        if (length == 0) {
+                goto out;
+        }
+
+        if (valid_ipv4_address (address, length) 
+            || valid_ipv6_address (address, length)
+            || valid_host_name (address, length)) {
+                ret = 1;
+        }
+
+out:        
+        return ret;
+}
+