diff -Nur busybox-1.1.1/networking/httpd.c busybox-1.1.1-owrt/networking/httpd.c
--- busybox-1.1.1/networking/httpd.c	2006-04-01 19:42:36.000000000 +0200
+++ busybox-1.1.1-owrt/networking/httpd.c	2006-04-01 19:43:59.000000000 +0200
@@ -247,6 +247,7 @@
   const char *query;
 
   USE_FEATURE_HTTPD_CGI(char *referer;)
+  USE_FEATURE_HTTPD_CGI(char *user_agent;)
 
   const char *configFile;
 
@@ -1208,6 +1209,7 @@
       addEnv("SERVER",         "PROTOCOL", "HTTP/1.0");
       addEnv("GATEWAY_INTERFACE", "",      "CGI/1.1");
       addEnv("REMOTE",         "ADDR",     config->rmt_ip_str);
+      addEnv("HTTP","USER_AGENT", config->user_agent);
 #ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
       addEnvPort("REMOTE");
 #endif
@@ -1771,6 +1773,10 @@
 		  for(test = buf + 8; isspace(*test); test++)
 			  ;
 		  config->referer = strdup(test);
+	} else if ((strncasecmp(buf, "User-Agent:",11) ==0)) {
+		for(test = buf + 11; isspace(*test); test++)
+			;
+		config->user_agent = strdup(test);
 	}
 #endif