PERFORCE change 45438 for review

[Andrew Reisse]

http://perforce.freebsd.org/chv.cgi?CH=45438

Change 45438 by areisse at areisse_ibook on 2004/01/16 06:56:59

	Call the new sebsd call for requesting type_change rules

Affected files ...

.. //depot/projects/trustedbsd/sedarwin/libsebsd/security_change_context.c#2 edit

Differences ...

==== //depot/projects/trustedbsd/sedarwin/libsebsd/security_change_context.c#2 (text+ko) ====

@@ -93,3 +93,53 @@
 	}
 	return (0);
 }
+
+struct changesid_args
+{
+  char *domain;
+  char *source;
+  char *sclass;
+  char *out;
+  int  *outlen;
+};
+
+int
+security_change_context2(const char *domain, const char *ocontext,
+    const char *oclass, char **newcontext)
+{
+        char *outcon;
+	size_t contexts_len, n;
+	int error;
+	struct changesid_args uap;
+
+bigger:
+	uap.outlen = &contexts_len;
+	uap.domain = domain;
+	uap.source = ocontext;
+	uap.sclass = oclass;
+	uap.out = NULL;
+	if (mac_syscall ("sebsd", 4, &uap))
+	  {
+	    return (-1);
+	  }
+	outcon = malloc(contexts_len);
+	if (outcon == NULL) {
+		return (-1);
+	}
+	uap.out = outcon;
+	error = mac_syscall ("sebsd", 4, &uap);
+	/*
+	 * We could possibly race and not have a large enough space
+	 * for the current set of contexts.
+	 */
+	if (error == -1 && errno == ENOMEM) {
+		free(outcon);
+		goto bigger;
+	}
+	else if (error == -1) {
+	        free(outcon);
+		return (-1);
+	}
+	*newcontext = outcon;
+	return 0;
+}
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