[GNUnet-SVN] [taler-twister] 29/34: adding command for randomly truncating responses.

[gnunet]

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marcello pushed a commit to branch master
in repository twister.

commit 1dd44afd032ed46d38500256222973044e4db95d
Author: Marcello Stanisci <address@hidden>
AuthorDate: Tue Mar 13 16:12:45 2018 +0100

    adding command for randomly truncating responses.
---
 src/include/taler_twister_service.h | 13 ++++++++++++
 src/twister/taler-twister-service.c | 41 +++++++++++++++++++++++++++++++++++++
 src/twister/taler-twister.c         | 18 ++++++++++++++++
 src/twister/twister.h               | 12 +++++++++++
 src/twister/twister_api.c           | 33 +++++++++++++++++++++++++++++
 5 files changed, 117 insertions(+)

diff --git a/src/include/taler_twister_service.h 
b/src/include/taler_twister_service.h
index d952bcd..701633d 100644
--- a/src/include/taler_twister_service.h
+++ b/src/include/taler_twister_service.h
@@ -111,6 +111,19 @@ TALER_TWISTER_change_response_code
    GNUNET_SCHEDULER_TaskCallback cb,
    void *cb_cls);
 
+/**
+ * Randomly truncate the response.
+ *
+ * @param h twister instance to control
+ * @param cb function to call once twister is ready
+ * @param cb_cls closure for @a cb
+ * @return operation handle (to possibly abort)
+ */
+struct TALER_TWISTER_Operation *
+TALER_TWISTER_malform
+  (struct TALER_TWISTER_Handle *h,
+   GNUNET_SCHEDULER_TaskCallback cb,
+   void *cb_cls);
 
 /**
  * Delete the object pointed to by @a path.
diff --git a/src/twister/taler-twister-service.c 
b/src/twister/taler-twister-service.c
index 251d5dc..9ea8151 100644
--- a/src/twister/taler-twister-service.c
+++ b/src/twister/taler-twister-service.c
@@ -253,6 +253,12 @@ static char delete_path[TWISTER_PATH_LENGTH] = {'\0'};
 static char modify_path[TWISTER_PATH_LENGTH] = {'\0'};
 
 /**
+ * If true, will randomly truncate the response before
+ * returning to the client.
+ */
+static unsigned int malform = GNUNET_NO;
+
+/**
  * New value.
  */
 static char modify_value[TWISTER_VALUE_LENGTH];
@@ -1298,11 +1304,24 @@ create_response (void *cls,
 
   if (NULL != hr->json)
   {
+    TALER_LOG_DEBUG ("Returning altered JSON.\n");
     body = json_dumps (hr->json, JSON_COMPACT);
     body_len = strlen (body);
     json_decref (hr->json);
   }
 
+  if (GNUNET_YES == malform)
+  {
+    size_t fake_len;
+
+    TALER_LOG_DEBUG
+      ("Will (badly) truncate the original output.\n");
+    fake_len = GNUNET_CRYPTO_random_u32
+      (GNUNET_CRYPTO_QUALITY_WEAK, hr->io_len);
+    body_len = fake_len; 
+    malform = GNUNET_NO;
+  }
+
   hr->response = MHD_create_response_from_buffer
     (body_len,
      body,
@@ -1740,6 +1759,23 @@ send_acknowledgement (struct GNUNET_SERVICE_Client *c)
 }
 
 /**
+ * Control handler for malforming responses.
+ *
+ * @param cls message queue for sending replies
+ * @param src received message
+ */
+static void
+handle_malform (void *cls,
+                const struct TWISTER_Malform *src)
+{
+  struct GNUNET_SERVICE_Client *c = cls;
+
+  malform = GNUNET_YES;
+  send_acknowledgement (c);
+}
+
+
+/**
  * Control handler for deleting JSON objects
  *
  * @param cls message queue for sending replies
@@ -1812,6 +1848,11 @@ GNUNET_SERVICE_MAIN
                          struct TWISTER_ModifyPath,
                          NULL),
 
+ GNUNET_MQ_hd_fixed_size (malform,
+                         TWISTER_MESSAGE_TYPE_MALFORM,
+                         struct TWISTER_Malform,
+                         NULL),
+
  GNUNET_MQ_hd_fixed_size (delete_path,
                          TWISTER_MESSAGE_TYPE_DELETE_PATH,
                          struct TWISTER_DeletePath,
diff --git a/src/twister/taler-twister.c b/src/twister/taler-twister.c
index e7fe2ea..2807bab 100644
--- a/src/twister/taler-twister.c
+++ b/src/twister/taler-twister.c
@@ -53,6 +53,11 @@ static unsigned int hack_response_code;
 static char *delete_path;
 
 /**
+ * If true, will randomly truncate the proxied response.
+ */
+static int malform_response;
+
+/**
  * Path to the object to modify.
  */
 static char *modify_path;
@@ -134,6 +139,13 @@ run (void *cls,
     return;
   }
 
+  if ( (0 != malform_response) &&
+       (NULL != TALER_TWISTER_malform
+         (tth,
+          &handle_acknowledgement,
+          NULL)))
+    num_ops++;
+   
 
   if (0 != check_alive)
   {
@@ -228,6 +240,12 @@ main (int argc,
        gettext_noop ("Check if twister accepts IPC connections\n"),
        &check_alive),
 
+    GNUNET_GETOPT_option_flag
+      ('M',
+       "malform",
+       gettext_noop ("Randomly truncate proxied response"),
+       &malform_response),
+
     GNUNET_GETOPT_option_uint
       ('r',
        "responsecode",
diff --git a/src/twister/twister.h b/src/twister/twister.h
index a9846e1..5954b3c 100644
--- a/src/twister/twister.h
+++ b/src/twister/twister.h
@@ -47,6 +47,18 @@
 
 #define TWISTER_MESSAGE_TYPE_MODIFY_PATH 4
 
+#define TWISTER_MESSAGE_TYPE_MALFORM 5
+
+GNUNET_NETWORK_STRUCT_BEGIN
+struct TWISTER_Malform
+{
+  /**
+   * Type: #TWISTER_MESSAGE_TYPE_MALFORM
+   */
+  struct GNUNET_MessageHeader header;
+
+};
+GNUNET_NETWORK_STRUCT_END
 
 GNUNET_NETWORK_STRUCT_BEGIN
 struct TWISTER_ModifyPath
diff --git a/src/twister/twister_api.c b/src/twister/twister_api.c
index 26bae3e..c05e34b 100644
--- a/src/twister/twister_api.c
+++ b/src/twister/twister_api.c
@@ -202,6 +202,39 @@ TALER_TWISTER_cancel (struct TALER_TWISTER_Operation *op)
   op->cb = NULL;
 }
 
+/**
+ * Randomly truncate the response.
+ *
+ * @param h twister instance to control
+ * @param cb function to call once twister is ready
+ * @param cb_cls closure for @a cb
+ * @return operation handle (to possibly abort)
+ */
+struct TALER_TWISTER_Operation *
+TALER_TWISTER_malform
+  (struct TALER_TWISTER_Handle *h,
+   GNUNET_SCHEDULER_TaskCallback cb,
+   void *cb_cls)
+{
+  struct TALER_TWISTER_Operation *op;
+  struct GNUNET_MQ_Envelope *env;
+  struct TWISTER_Malform *src;
+
+  op = GNUNET_new (struct TALER_TWISTER_Operation);
+  op->h = h;
+  op->cb = cb;
+  op->cb_cls = cb_cls;
+  GNUNET_CONTAINER_DLL_insert_tail (h->op_head,
+                                    h->op_tail,
+                                    op);
+  /* Prepare *env*elope. */
+  env = GNUNET_MQ_msg
+    (src, TWISTER_MESSAGE_TYPE_MALFORM);
+  /* Send message. */
+  GNUNET_MQ_send (h->mq, env);
+  return op;
+}
+
 
 /**
  * Delete the object pointed to by @a path.

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