Render adaptation X-Response-Info and X-Response-Desc meta values in FTP errors

caused by adaptation (e.g., an ICAP service blocking an FTP command)

Requires adaptation history to be enabled, which can be achieved by logging
adaptation meta headers to access log (%adapt::<last_h) or setting
adaptation_masterx_shared_names in squid.conf

Long term, the contents of the error message should be configurable via
error message templates (which may include these semi-standard meta headers).

diff --git a/src/client_side.cc b/src/client_side.cc
index 21e81b53b53742b1944c2fa6a1a18d6f10448730..e84f2cef43b7743e614874c4a8352ba694be01aa 100644 (file)
--- a/src/client_side.cc
+++ b/src/client_side.cc
@@ -5279,6 +5279,53 @@ FtpWriteForwardedReply(ClientSocketContext *context, const HttpReply *reply)
     FtpWriteForwardedReply(context, reply, call);
 }
 
+static void 
+FtpWriteForwardedForeign(ClientSocketContext *context, const HttpReply *reply)
+{
+    ConnStateData *const connState = context->getConn();
+    connState->ftp.state = ConnStateData::FTP_ERROR;
+
+    assert(context->http);
+    const HttpRequest *request = context->http->request;
+    assert(request);
+
+    assert(reply != NULL);
+    const int status = 421;
+    const char *reason = reply->sline.reason();
+    MemBuf mb;
+    mb.init();
+
+    if (request->errType != ERR_NONE)
+        mb.Printf("%i-%s\r\n", status, errorPageName(request->errType));
+
+    if (request->errDetail > 0) {
+        // XXX: > 0 may not always mean that this is an errno
+        mb.Printf("%i-Error: (%d) %s\r\n", status,
+                  request->errDetail,
+                  strerror(request->errDetail));
+    }
+
+    // XXX: Remove hard coded names. Use an error page template instead.
+    const Adaptation::History::Pointer ah = request->adaptHistory();
+    if (ah != NULL) { // XXX: add adapt::<all_h but use lastMeta here
+        const String info = ah->allMeta.getByName("X-Response-Info");
+        const String desc = ah->allMeta.getByName("X-Response-Desc");
+        if (info.size())
+            mb.Printf("%i-Information: %s\r\n", status, info.termedBuf());
+        if (desc.size())
+            mb.Printf("%i-Description: %s\r\n", status, desc.termedBuf());
+    }
+
+    mb.Printf("%i %s\r\n", status, reason); // error terminating line
+
+    // TODO: errorpage.cc should detect FTP client and use
+    // configurable FTP-friendly error templates which we should
+    // write to the client "as is" instead of hiding most of the info
+
+    FtpWriteReply(context, mb);
+    return;
+}
+
 static void
 FtpWriteForwardedReply(ClientSocketContext *context, const HttpReply *reply, AsyncCall::Pointer call)
 {
@@ -5288,31 +5335,7 @@ FtpWriteForwardedReply(ClientSocketContext *context, const HttpReply *reply, Asy
 
     // adaptation and forwarding errors lack HDR_FTP_STATUS
     if (!header.has(HDR_FTP_STATUS)) {
-        connState->ftp.state = ConnStateData::FTP_ERROR;
-
-        assert(context->http);
-        const HttpRequest *request = context->http->request;
-        assert(request);
-
-        const int status = 421;
-        const char *reason = reply->sline.reason();
-        MemBuf mb;
-        mb.init();
-        if (request->errType != ERR_NONE)
-            mb.Printf("%i-%s\r\n", status, errorPageName(request->errType));
-        if (request->errDetail > 0) {
-            // XXX: > 0 may not always mean that this is an errno
-            mb.Printf("%i-Error: (%d) %s\r\n", status,
-                      request->errDetail,
-                      strerror(request->errDetail));
-        }
-        mb.Printf("%i %s\r\n", status, reason); // error terminating line
-
-        // TODO: errorpage.cc should detect FTP client and use
-        // configurable FTP-friendly error templates which we should
-        // write to the client "as is" instead of hiding most of the info
-
-        FtpWriteReply(context, mb);
+        FtpWriteForwardedForeign(context, reply);
         return;
     }