From bb8811d472a136335ecf4965419504df7d592a08 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Mon, 20 Jan 2025 15:25:26 +0000
Subject: [PATCH] Convert DNS names in logs to all lower case.

0x20 encoding makes them look odd, otherwise.
---
 src/cache.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/cache.c b/src/cache.c
index f2aecca..fd959a8 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -1852,15 +1852,31 @@ int cache_make_stat(struct txt_record *t)
 #endif
 
 /* There can be names in the cache containing control chars, don't 
-   mess up logging or open security holes. */
+   mess up logging or open security holes. Also convert to all-LC
+   so that 0x20-encoding doesn't make logs look like ransom notes
+   made out of letters cut from a newspaper.
+   Overwrites daemon->workspacename */
 static char *sanitise(char *name)
 {
-  unsigned char *r;
+  unsigned char *r = (unsigned char *)name;
+  
   if (name)
-    for (r = (unsigned char *)name; *r; r++)
-      if (!isprint((int)*r))
-	return "<name unprintable>";
-
+    {
+      char *d = name = daemon->workspacename;
+      
+      for (; *r; r++, d++)
+	if (!isprint((int)*r))
+	  return "<name unprintable>";
+	else
+	  {
+	    unsigned char c = *r;
+	    
+	    *d = (char)((c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c);
+	  }
+      
+      *d = 0;
+    }
+  
   return name;
 }