X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=name.c;h=15e324c5f2fca44c623347789100bc752af82761;hb=91cdde8a7a08c6797995cc67f4b55ac43780cdd8;hp=4b4b0b87d179720a4efd9f36b0f9206779833b06;hpb=6091827530d6dd43479d6709fb6e9f745c11e900;p=elogind.git

diff --git a/name.c b/name.c
index 4b4b0b87d..15e324c5f 100644
--- a/name.c
+++ b/name.c
@@ -2,6 +2,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <string.h>
 
 #include "set.h"
 #include "name.h"
@@ -30,6 +31,32 @@ NameType name_type_from_string(const char *n) {
         return _NAME_TYPE_INVALID;
 }
 
+#define VALID_CHARS                             \
+        "0123456789"                            \
+        "abcdefghijklmnopqrstuvwxyz"            \
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
+        "-_"
+
+bool name_is_valid(const char *n) {
+        NameType t;
+        const char *e, *i;
+
+        assert(n);
+
+        t = name_type_from_string(n);
+        if (t < 0 || t >= _NAME_TYPE_MAX)
+                return false;
+
+        if (!(e = strrchr(n, '.')))
+                return false;
+
+        for (i = n; i < e; i++)
+                if (!strchr(VALID_CHARS, *i))
+                        return false;
+
+        return true;
+}
+
 Name *name_new(Manager *m) {
         Name *n;