smtp: add file_data debug code

src/detect-engine-filedata-smtp.c

@@ -88,6 +88,7 @@ static uint8_t *DetectEngineSMTPGetBufferForTX(uint64_t tx_id,
                                                uint32_t *buffer_len,
                                                uint32_t *stream_start_offset)
 {
+    SCEnter();
     int index = 0;
     uint8_t *buffer = NULL;
     *buffer_len = 0;
@@ -108,7 +109,9 @@ static uint8_t *DetectEngineSMTPGetBufferForTX(uint64_t tx_id,
             if (det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer_len != 0) {
                 *buffer_len = det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer_len;
                 *stream_start_offset = det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].offset;
-                return det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer;
+                buffer = det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer;
+
+                SCReturnPtr(buffer, "uint8_t");
             }
         } else {
             if (SMTPCreateSpace(det_ctx, (tx_id - det_ctx->smtp_start_tx_id) + 1) < 0)
@@ -122,6 +125,11 @@ static uint8_t *DetectEngineSMTPGetBufferForTX(uint64_t tx_id,
         index = (tx_id - det_ctx->smtp_start_tx_id);
     }
 
+    SCLogDebug("smtp_config.content_limit %u, smtp_config.content_inspect_min_size %u",
+                smtp_config.content_limit, smtp_config.content_inspect_min_size);
+
+    SCLogDebug("file %p size %"PRIu64", state %d", curr_file, curr_file->content_len_so_far, curr_file->state);
+
     /* no new data */
     if (curr_file->content_inspected == curr_file->content_len_so_far) {
         SCLogDebug("no new data");
@@ -188,12 +196,15 @@ static uint8_t *DetectEngineSMTPGetBufferForTX(uint64_t tx_id,
 
     /* updat inspected tracker */
     curr_file->content_inspected = curr_file->chunks_tail->stream_offset + curr_file->chunks_tail->len;
+    SCLogDebug("curr_file->content_inspected now %"PRIu64, curr_file->content_inspected);
 
     buffer = det_ctx->smtp[index].buffer;
     *buffer_len = det_ctx->smtp[index].buffer_len;
     *stream_start_offset = det_ctx->smtp[index].offset;
+
 end:
-    return buffer;
+    SCLogDebug("buffer %p, len %u", buffer, *buffer_len);
+    SCReturnPtr(buffer, "uint8_t");
 }
 
 int DetectEngineInspectSMTPFiledata(ThreadVars *tv,