Add paranoid printing using strvisx.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@25332 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/log.c

@@ -32,6 +32,7 @@
  */
 
 #include "krb5_locl.h"
+#include <vis.h>
 
 struct facility {
     int min;
@@ -218,11 +219,21 @@ log_file(const char *timestr,
 	 void *data)
 {
     struct file_data *f = data;
+    char *msgclean;
+    size_t len = strlen(msg) + 1;
     if(f->keep_open == 0)
 	f->fd = fopen(f->filename, f->mode);
     if(f->fd == NULL)
 	return;
-    fprintf(f->fd, "%s %s\n", timestr, msg);
+    /* make sure the log doesn't contain special chars */
+    len *= 4;
+    msgclean = malloc(len);
+    if (msgclean == NULL)
+	goto out;
+    strvisx(rk_UNCONST(msg), msgclean, len, VIS_OCTAL);
+    fprintf(f->fd, "%s %s\n", timestr, msgclean);
+    free(msgclean);
+ out:
     if(f->keep_open == 0) {
 	fclose(f->fd);
 	f->fd = NULL;