unix domain socket transport, associated test cases

1 files changed, 922 insertions, 0 deletions

diff --git a/src/transport/test_transport_api_unreliability.c b/src/transport/test_transport_api_unreliability.c
new file mode 100644
index 000000000..caafdbc5d
--- /dev/null
+++ b/src/transport/test_transport_api_unreliability.c
@@ -0,0 +1,922 @@
+/*
+     This file is part of GNUnet.
+     (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file transport/test_transport_api_unreliability.c
+ * @brief test case for transports; ensures messages get
+ *        through, regardless of order
+ *
+ * This test case serves as a base for unreliable
+ * transport test cases to check that the transports
+ * achieve reliable message delivery.
+ */
+#include "platform.h"
+#include "gnunet_common.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_getopt_lib.h"
+#include "gnunet_os_lib.h"
+#include "gnunet_program_lib.h"
+#include "gnunet_scheduler_lib.h"
+#include "gnunet_server_lib.h"
+#include "gnunet_transport_service.h"
+#include "gauger.h"
+#include "transport.h"
+
+#define VERBOSE GNUNET_NO
+
+#define VERBOSE_ARM GNUNET_NO
+
+#define START_ARM GNUNET_YES
+
+/**
+ * Note that this value must not significantly exceed
+ * 'MAX_PENDING' in 'gnunet-service-transport.c', otherwise
+ * messages may be dropped even for a reliable transport.
+ */
+#define TOTAL_MSGS (80000 * 3) /* Total messages should be divisible by 8, so we can make a nice bitmap */
+
+/**
+ * How long until we give up on transmitting the message?
+ */
+#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1500)
+
+#define UNRELIABLE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
+
+#define MTYPE 12345
+
+struct PeerContext
+{
+  struct GNUNET_CONFIGURATION_Handle *cfg;
+  struct GNUNET_TRANSPORT_Handle *th;
+  struct GNUNET_PeerIdentity id;
+#if START_ARM
+  struct GNUNET_OS_Process *arm_proc;
+#endif
+};
+
+static struct PeerContext p1;
+
+static struct PeerContext p2;
+
+static int ok;
+
+static int is_tcp;
+
+static int is_tcp_nat;
+
+static int is_http;
+
+static int is_https;
+
+static int is_udp;
+
+static int is_unix;
+
+static int connected;
+
+static unsigned long long total_bytes;
+
+static struct GNUNET_TIME_Absolute start_time;
+
+static GNUNET_SCHEDULER_TaskIdentifier die_task;
+
+static char *key_file_p1;
+static char *cert_file_p1;
+
+static char *key_file_p2;
+static char *cert_file_p2;
+
+static char *test_name;
+
+static char bitmap[TOTAL_MSGS / 8];
+
+static int msg_scheduled;
+static int msg_sent;
+static int msg_recv_expected;
+static int msg_recv;
+static struct GNUNET_TRANSPORT_TransmitHandle * transmit_handle;
+
+#if VERBOSE
+#define OKPP do { ok++; fprintf (stderr, "Now at stage %u at %s:%u\n", ok, __FILE__, __LINE__); } while (0)
+#else
+#define OKPP do { ok++; } while (0)
+#endif
+
+/**
+ * Sets a bit active in the bitmap.
+ *
+ * @param bitIdx which bit to set
+ */
+static void
+set_bit (unsigned int bitIdx)
+{
+  size_t arraySlot;
+  unsigned int targetBit;
+  if (bitIdx > sizeof(bitmap) * 8)
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "setting bit %d of %d(!)\n", bitIdx, sizeof(bitmap) * 8);
+      return;
+    }
+  GNUNET_assert(bitIdx < sizeof(bitmap) * 8);
+  arraySlot = bitIdx / 8;
+  targetBit = (1L << (bitIdx % 8));
+  bitmap[arraySlot] |= targetBit;
+}
+
+/**
+ * Obtain a bit from bitmap.
+ * @param map the bitmap
+ * @param bit index from bitmap
+ *
+ * @return Bit \a bit from hashcode \a code
+ */
+int
+get_bit (const char *map, unsigned int bit)
+{
+  if (bit >= TOTAL_MSGS)
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "get bit %d of %d(!?!?)\n", bit, sizeof(bitmap) * 8);
+      return 0;
+    }
+  return ((map)[bit >> 3] & (1 << (bit & 7))) > 0;
+}
+
+static void
+end ()
+{
+  unsigned long long delta;
+  int i;
+  int result;
+  char *value_name;
+
+  result = 0;
+  for (i = 0; i < TOTAL_MSGS; i++)
+    {
+      if (get_bit(bitmap, i) == 0)
+        {
+          GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Did not receive message %d\n", i);
+          result = -1;
+        }
+    }
+
+  GNUNET_SCHEDULER_cancel (die_task);
+  die_task = GNUNET_SCHEDULER_NO_TASK;
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from transports!\n");
+#endif
+  GNUNET_TRANSPORT_disconnect (p1.th);
+  GNUNET_TRANSPORT_disconnect (p2.th);
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Transports disconnected, returning success!\n");
+#endif
+  delta = GNUNET_TIME_absolute_get_duration (start_time).rel_value;
+  GNUNET_asprintf(&value_name, "unreliable_kbs_%s", test_name);
+  GAUGER (value_name, (int)(total_bytes * 1000 / 1024 /delta));
+  GNUNET_free(value_name);
+  fprintf (stderr,
+           "\nThroughput was %llu kb/s\n",
+           total_bytes * 1000 / 1024 / delta);
+  ok = result;
+
+}
+
+static void
+end_unreliably ()
+{
+  unsigned long long delta;
+  int i;
+  int num_failed;
+  char *value_name;
+  num_failed = 0;
+  for (i = 0; i < TOTAL_MSGS; i++)
+    {
+      if (get_bit(bitmap, i) == 0)
+        {
+          GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Did not receive message %d\n", i);
+          num_failed++;
+        }
+    }
+
+  die_task = GNUNET_SCHEDULER_NO_TASK;
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from transports!\n");
+#endif
+  GNUNET_TRANSPORT_disconnect (p1.th);
+  GNUNET_TRANSPORT_disconnect (p2.th);
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Transports disconnected, returning success!\n");
+#endif
+  delta = GNUNET_TIME_absolute_get_duration (start_time).rel_value;
+  fprintf (stderr,
+           "\nThroughput was %llu kb/s\n",
+           total_bytes * 1000 / 1024 / delta);
+  GNUNET_asprintf(&value_name, "unreliable_kbs_%s", test_name);
+  GAUGER (value_name, (int)(total_bytes * 1000 / 1024 /delta));
+  GNUNET_free(value_name);
+  GNUNET_asprintf(&value_name, "unreliable_failed_%s", test_name);
+  GAUGER (value_name, (int)num_failed);
+  GNUNET_free(value_name);
+  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Had %d failed messages!\n", num_failed);
+  ok = 0;
+
+}
+
+
+
+static void
+stop_arm (struct PeerContext *p)
+{
+#if START_ARM
+  if (0 != GNUNET_OS_process_kill (p->arm_proc, SIGTERM))
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
+  GNUNET_OS_process_wait (p->arm_proc);
+  GNUNET_OS_process_close (p->arm_proc);
+  p->arm_proc = NULL;
+#endif
+  GNUNET_CONFIGURATION_destroy (p->cfg);
+}
+
+
+static void
+end_badly (void *cls,
+           const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Reliability failed: \nLast message sent %u \nNext message scheduled %u\nLast message received %u\nMessage expected %u \n ", msg_sent, msg_scheduled, msg_recv, msg_recv_expected);
+  GNUNET_break (0);
+  GNUNET_TRANSPORT_disconnect (p1.th);
+  GNUNET_TRANSPORT_disconnect (p2.th);
+  ok = 1;
+}
+
+
+struct TestMessage
+{
+  struct GNUNET_MessageHeader header;
+  uint32_t num;
+};
+
+
+static unsigned int
+get_size (unsigned int iter)
+{
+  unsigned int ret;
+
+  if (iter < 60000)
+    return iter + sizeof (struct TestMessage);
+  ret = (iter * iter * iter);
+  return sizeof (struct TestMessage) + (ret % 60000);
+}
+
+
+static void
+notify_receive (void *cls,
+                const struct GNUNET_PeerIdentity *peer,
+                const struct GNUNET_MessageHeader *message,
+                const struct GNUNET_TRANSPORT_ATS_Information *ats,
+                uint32_t ats_count)
+{
+  static int n;
+  unsigned int s;
+  char cbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+  const struct TestMessage *hdr;
+
+  hdr = (const struct TestMessage*) message;
+
+  if (MTYPE != ntohs (message->type))
+    return;
+  msg_recv_expected = n;
+  msg_recv = ntohl(hdr->num);
+  s = get_size (ntohl(hdr->num));
+
+  if (ntohs (message->size) != s)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Expected message %u of size %u, got %u bytes of message %u\n",
+                  ntohl(hdr->num), s,
+                  ntohs (message->size),
+                  ntohl (hdr->num));
+      GNUNET_SCHEDULER_cancel (die_task);
+      die_task = GNUNET_SCHEDULER_add_now (&end_badly, NULL);
+      return;
+    }
+
+  memset (cbuf, ntohl(hdr->num), s - sizeof (struct TestMessage));
+  if (0 != memcmp (cbuf,
+                   &hdr[1],
+                   s - sizeof (struct TestMessage)))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Expected message %u with bits %u, but body did not match\n",
+                  ntohl(hdr->num), (unsigned char) n);
+      GNUNET_SCHEDULER_cancel (die_task);
+      die_task = GNUNET_SCHEDULER_add_now (&end_badly, NULL);
+      return;
+    }
+#if VERBOSE
+  if (ntohl(hdr->num) % 5 == 0)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Got message %u of size %u\n",
+                  ntohl (hdr->num),
+                  ntohs (message->size));
+    }
+#endif
+  n++;
+  set_bit(ntohl(hdr->num));
+  if (0 == (n % (5000)))
+    {
+      fprintf (stderr, ".");
+      GNUNET_SCHEDULER_cancel (die_task);
+      die_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
+                                               &end_badly,
+                                               NULL);
+    }
+  if (n == TOTAL_MSGS)
+    end ();
+}
+
+
+static size_t
+notify_ready (void *cls, size_t size, void *buf)
+{
+  static int n;
+  char *cbuf = buf;
+  struct TestMessage hdr;
+  unsigned int s;
+  unsigned int ret;
+
+  if (buf == NULL)
+    {
+      GNUNET_break (0);
+      ok = 42;
+      return 0;
+    }
+  ret = 0;
+  s = get_size (n);
+  GNUNET_assert (size >= s);
+  GNUNET_assert (buf != NULL);
+  cbuf = buf;
+  do
+    {
+      hdr.header.size = htons (s);
+      hdr.header.type = htons (MTYPE);
+      hdr.num = htonl (n);
+      msg_sent = n;
+      memcpy (&cbuf[ret], &hdr, sizeof (struct TestMessage));
+      ret += sizeof (struct TestMessage);
+      memset (&cbuf[ret], n, s - sizeof (struct TestMessage));
+      ret += s - sizeof (struct TestMessage);
+#if VERBOSE
+      if (n % 5000 == 0)
+        {
+          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                      "Sending message %u of size %u\n",
+                      n,
+                      s);
+        }
+#endif
+      n++;
+      s = get_size (n);
+      if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 16))
+        break; /* sometimes pack buffer full, sometimes not */
+    }
+  while (size - ret >= s);
+  if (n < TOTAL_MSGS)
+  {
+    GNUNET_TRANSPORT_notify_transmit_ready (p2.th,
+                                            &p1.id,
+                                            s, 0, TIMEOUT,
+                                            &notify_ready,
+                                            NULL);
+    msg_scheduled = n;
+  }
+  else
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "All messages scheduled to be sent!!\n");
+      GNUNET_SCHEDULER_cancel(die_task);
+      die_task = GNUNET_SCHEDULER_add_delayed (UNRELIABLE_TIMEOUT, &end_unreliably, NULL);
+    }
+  if (n % 5000 == 0)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Returning total message block of size %u\n",
+                  ret);
+    }
+  total_bytes += ret;
+  return ret;
+}
+
+
+static void
+notify_connect (void *cls,
+                const struct GNUNET_PeerIdentity *peer,
+                const struct GNUNET_TRANSPORT_ATS_Information *ats,
+                uint32_t ats_count)
+{
+  if (cls == &p1)
+    {
+      GNUNET_TRANSPORT_set_quota (p1.th,
+                                  &p2.id,
+                                  GNUNET_BANDWIDTH_value_init (1024 * 1024 * 1024),
+                                  GNUNET_BANDWIDTH_value_init (1024 * 1024 * 1024),
+                                  GNUNET_TIME_UNIT_FOREVER_REL,
+                                  NULL, NULL);
+      start_time = GNUNET_TIME_absolute_get ();
+      connected++;
+    }
+  else
+    {
+      GNUNET_TRANSPORT_set_quota (p2.th,
+                                  &p1.id,
+                                  GNUNET_BANDWIDTH_value_init (1024 * 1024 * 1024),
+                                  GNUNET_BANDWIDTH_value_init (1024 * 1024 * 1024),
+                                  GNUNET_TIME_UNIT_FOREVER_REL,
+                                  NULL, NULL);
+      connected++;
+    }
+
+  if (connected == 2)
+    {
+
+          if ((transmit_handle!=NULL) && (cls == NULL))
+                 GNUNET_TRANSPORT_notify_transmit_ready_cancel(transmit_handle);
+          if ((transmit_handle!=NULL) && (cls == &transmit_handle))
+                 transmit_handle=NULL;
+      GNUNET_TRANSPORT_notify_transmit_ready (p2.th,
+                                              &p1.id,
+                                              get_size (0), 0, TIMEOUT,
+                                              &notify_ready,
+                                              NULL);
+    }
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Peer `%4s' connected to us (%p)!\n", GNUNET_i2s (peer), cls);
+#endif
+}
+
+
+static void
+notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+{
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Peer `%4s' disconnected (%p)!\n",
+              GNUNET_i2s (peer), cls);
+#endif
+}
+
+
+static void
+setup_peer (struct PeerContext *p, const char *cfgname)
+{
+  p->cfg = GNUNET_CONFIGURATION_create ();
+#if START_ARM
+  p->arm_proc = GNUNET_OS_start_process (NULL, NULL,
+                                        "gnunet-service-arm",
+                                        "gnunet-service-arm",
+#if VERBOSE_ARM
+                                        "-L", "DEBUG",
+#endif
+                                        "-c", cfgname, NULL);
+#endif
+  GNUNET_assert (GNUNET_OK == GNUNET_CONFIGURATION_load (p->cfg, cfgname));
+
+  if (is_https)
+  {
+          struct stat sbuf;
+          if (p==&p1)
+          {
+                  if (GNUNET_CONFIGURATION_have_value (p->cfg,
+                                                                                           "transport-https", "KEY_FILE"))
+                                GNUNET_CONFIGURATION_get_value_string (p->cfg, "transport-https", "KEY_FILE", &key_file_p1);
+                  if (key_file_p1 == NULL)
+                          GNUNET_asprintf(&key_file_p1,"https_p1.key");
+                  if (0 == stat (key_file_p1, &sbuf ))
+                  {
+                          if (0 == remove(key_file_p1))
+                              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Successfully removed existing private key file `%s'\n",key_file_p1);
+                          else
+                                  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove private key file `%s'\n",key_file_p1);
+                  }
+                  if (GNUNET_CONFIGURATION_have_value (p->cfg,"transport-https", "CERT_FILE"))
+                          GNUNET_CONFIGURATION_get_value_string (p->cfg, "transport-https", "CERT_FILE", &cert_file_p1);
+                  if (cert_file_p1 == NULL)
+                          GNUNET_asprintf(&cert_file_p1,"https_p1.cert");
+                  if (0 == stat (cert_file_p1, &sbuf ))
+                  {
+                          if (0 == remove(cert_file_p1))
+                              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Successfully removed existing certificate file `%s'\n",cert_file_p1);
+                          else
+                                  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove existing certificate file `%s'\n",cert_file_p1);
+                  }
+          }
+          else if (p==&p2)
+          {
+                  if (GNUNET_CONFIGURATION_have_value (p->cfg,
+                                                                                           "transport-https", "KEY_FILE"))
+                                GNUNET_CONFIGURATION_get_value_string (p->cfg, "transport-https", "KEY_FILE", &key_file_p2);
+                  if (key_file_p2 == NULL)
+                          GNUNET_asprintf(&key_file_p2,"https_p2.key");
+                  if (0 == stat (key_file_p2, &sbuf ))
+                  {
+                          if (0 == remove(key_file_p2))
+                              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Successfully removed existing private key file `%s'\n",key_file_p2);
+                          else
+                                  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove private key file `%s'\n",key_file_p2);
+                  }
+                  if (GNUNET_CONFIGURATION_have_value (p->cfg,"transport-https", "CERT_FILE"))
+                          GNUNET_CONFIGURATION_get_value_string (p->cfg, "transport-https", "CERT_FILE", &cert_file_p2);
+                  if (cert_file_p2 == NULL)
+                          GNUNET_asprintf(&cert_file_p2,"https_p2.cert");
+                  if (0 == stat (cert_file_p2, &sbuf ))
+                  {
+                          if (0 == remove(cert_file_p2))
+                              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Successfully removed existing certificate file `%s'\n",cert_file_p2);
+                          else
+                                  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove existing certificate file `%s'\n",cert_file_p2);
+                  }
+          }
+  }
+
+  p->th = GNUNET_TRANSPORT_connect (p->cfg, NULL,
+                                    p,
+                                    &notify_receive,
+                                    &notify_connect,
+                                    &notify_disconnect);
+  GNUNET_assert (p->th != NULL);
+}
+
+static size_t
+notify_ready_connect (void *cls, size_t size, void *buf)
+{
+  return 0;
+}
+
+static void
+exchange_hello_last (void *cls,
+                     const struct GNUNET_MessageHeader *message)
+{
+  struct PeerContext *me = cls;
+  transmit_handle = NULL;
+  GNUNET_TRANSPORT_get_hello_cancel (p2.th, &exchange_hello_last, me);
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Exchanging HELLO with peer (%p)!\n", cls);
+#endif
+  GNUNET_assert (ok >= 3);
+  OKPP;
+  GNUNET_assert (message != NULL);
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *)
+                                      message, &me->id));
+
+  GNUNET_assert(NULL != (transmit_handle = GNUNET_TRANSPORT_notify_transmit_ready (p2.th,
+                                          &p1.id,
+                                          sizeof (struct GNUNET_MessageHeader), 0,
+                                          TIMEOUT,
+                                          &notify_ready_connect,
+                                          &transmit_handle)));
+
+  /* both HELLOs exchanged, get ready to test transmission! */
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Finished exchanging HELLOs, now waiting for transmission!\n");
+}
+
+
+static void
+exchange_hello (void *cls,
+                const struct GNUNET_MessageHeader *message)
+{
+  struct PeerContext *me = cls;
+
+  GNUNET_TRANSPORT_get_hello_cancel (p1.th, &exchange_hello, me);
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Exchanging HELLO with peer (%p)!\n", cls);
+#endif
+  GNUNET_assert (ok >= 2);
+  OKPP;
+  GNUNET_assert (message != NULL);
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *)
+                                      message, &me->id));
+
+#if VERBOSE
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received HELLO size %d\n",
+              GNUNET_HELLO_size((const struct GNUNET_HELLO_Message *)message));
+#endif
+  GNUNET_TRANSPORT_offer_hello (p2.th, message);
+  GNUNET_TRANSPORT_get_hello (p2.th, &exchange_hello_last, &p2);
+}
+
+/**
+ * Return the actual path to a file found in the current
+ * PATH environment variable.
+ *
+ * @param binary the name of the file to find
+ */
+static char *
+get_path_from_PATH (char *binary)
+{
+  char *path;
+  char *pos;
+  char *end;
+  char *buf;
+  const char *p;
+
+  p = getenv ("PATH");
+  if (p == NULL)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  _("PATH environment variable is unset.\n"));
+      return NULL;
+    }
+  path = GNUNET_strdup (p);     /* because we write on it */
+  buf = GNUNET_malloc (strlen (path) + 20);
+  pos = path;
+
+  while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
+    {
+      *end = '\0';
+      sprintf (buf, "%s/%s", pos, binary);
+      if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
+        {
+          GNUNET_free (path);
+          return buf;
+        }
+      pos = end + 1;
+    }
+  sprintf (buf, "%s/%s", pos, binary);
+  if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
+    {
+      GNUNET_free (path);
+      return buf;
+    }
+  GNUNET_free (buf);
+  GNUNET_free (path);
+  return NULL;
+}
+
+/**
+ * Check whether the suid bit is set on a file.
+ * Attempts to find the file using the current
+ * PATH environment variable as a search path.
+ *
+ * @param binary the name of the file to check
+ *
+ * @return GNUNET_YES if the binary is found and
+ *         can be run properly, GNUNET_NO otherwise
+ */
+static int
+check_gnunet_nat_binary(char *binary)
+{
+  struct stat statbuf;
+  char *p;
+#ifdef MINGW
+  SOCKET rawsock;
+#endif
+
+#ifdef MINGW
+  char *binaryexe;
+  GNUNET_asprintf (&binaryexe, "%s.exe", binary);
+  p = get_path_from_PATH (binaryexe);
+  free (binaryexe);
+#else
+  p = get_path_from_PATH (binary);
+#endif
+  if (p == NULL)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  _("Could not find binary `%s' in PATH!\n"),
+                  binary);
+      return GNUNET_NO;
+    }
+  if (0 != STAT (p, &statbuf))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                  _("stat (%s) failed: %s\n"),
+                  p,
+                  STRERROR (errno));
+      GNUNET_free (p);
+      return GNUNET_SYSERR;
+    }
+  GNUNET_free (p);
+#ifndef MINGW
+  if ( (0 != (statbuf.st_mode & S_ISUID)) &&
+       (statbuf.st_uid == 0) )
+    return GNUNET_YES;
+  return GNUNET_NO;
+#else
+  rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
+  if (INVALID_SOCKET == rawsock)
+    {
+      DWORD err = GetLastError ();
+      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                  "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) have failed! GLE = %d\n", err);
+      return GNUNET_NO; /* not running as administrator */
+    }
+  closesocket (rawsock);
+  return GNUNET_YES;
+#endif
+}
+
+static void
+run (void *cls,
+     char *const *args,
+     const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  GNUNET_assert (ok == 1);
+  OKPP;
+  die_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
+                                           &end_badly,
+                                           NULL);
+  if (is_tcp)
+    {
+      setup_peer (&p1, "test_transport_api_tcp_peer1.conf");
+      setup_peer (&p2, "test_transport_api_tcp_peer2.conf");
+    }
+  else if (is_http)
+    {
+      setup_peer (&p1, "test_transport_api_rel_http_peer1.conf");
+      setup_peer (&p2, "test_transport_api_rel_http_peer2.conf");
+    }
+  else if (is_https)
+    {
+      setup_peer (&p1, "test_transport_api_rel_https_peer1.conf");
+      setup_peer (&p2, "test_transport_api_rel_https_peer2.conf");
+    }
+  else if (is_udp)
+    {
+      setup_peer (&p1, "test_transport_api_udp_peer1.conf");
+      setup_peer (&p2, "test_transport_api_udp_peer2.conf");
+    }
+  else if (is_unix)
+    {
+      setup_peer (&p1, "test_transport_api_unix_peer1.conf");
+      setup_peer (&p2, "test_transport_api_unix_peer2.conf");
+    }
+  else if (is_tcp_nat)
+    {
+      setup_peer (&p1, "test_transport_api_tcp_nat_peer1.conf");
+      setup_peer (&p2, "test_transport_api_tcp_nat_peer2.conf");
+    }
+  else
+    GNUNET_assert (0);
+  GNUNET_assert(p1.th != NULL);
+  GNUNET_assert(p2.th != NULL);
+  GNUNET_TRANSPORT_get_hello (p1.th, &exchange_hello, &p1);
+}
+
+
+static int
+check ()
+{
+  char *const argv[] = { "test-transport-api-reliability",
+    "-c",
+    "test_transport_api_data.conf",
+#if VERBOSE
+    "-L", "DEBUG",
+#endif
+    NULL
+  };
+  struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_OPTION_END
+  };
+
+#if WRITECONFIG
+  setTransportOptions("test_transport_api_data.conf");
+#endif
+  ok = 1;
+
+  if ((GNUNET_YES == is_tcp_nat) && (check_gnunet_nat_binary("gnunet-nat-server") != GNUNET_YES))
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Not running NAT test case, binaries not properly installed.\n");
+      return 0;
+    }
+
+  GNUNET_PROGRAM_run ((sizeof (argv) / sizeof (char *)) - 1,
+                      argv, "test-transport-api-reliability", "nohelp",
+                      options, &run, &ok);
+  stop_arm (&p1);
+  stop_arm (&p2);
+
+  if (is_https)
+  {
+    struct stat sbuf;
+    if (0 == stat (cert_file_p1, &sbuf ))
+    {
+      if (0 == remove(cert_file_p1))
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Successfully removed existing certificate file `%s'\n",cert_file_p1);
+      else
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove certfile `%s'\n",cert_file_p1);
+    }
+
+    if (0 == stat (key_file_p1, &sbuf ))
+    {
+      if (0 == remove(key_file_p1))
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Successfully removed private key file `%s'\n",key_file_p1);
+      else
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to private key file `%s'\n",key_file_p1);
+    }
+
+    if (0 == stat (cert_file_p2, &sbuf ))
+    {
+      if (0 == remove(cert_file_p2))
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Successfully removed existing certificate file `%s'\n",cert_file_p2);
+      else
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to remove certfile `%s'\n",cert_file_p2);
+    }
+
+    if (0 == stat (key_file_p2, &sbuf ))
+    {
+      if (0 == remove(key_file_p2))
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Successfully removed private key file `%s'\n",key_file_p2);
+      else
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to private key file `%s'\n",key_file_p2);
+    }
+    GNUNET_free(key_file_p1);
+    GNUNET_free(key_file_p2);
+    GNUNET_free(cert_file_p1);
+    GNUNET_free(cert_file_p2);
+  }
+
+  return ok;
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  int ret;
+#ifdef MINGW
+  return GNUNET_SYSERR;
+#endif
+
+  GNUNET_DISK_directory_remove ("/tmp/test-gnunetd-transport-peer-1");
+  GNUNET_DISK_directory_remove ("/tmp/test-gnunetd-transport-peer-2");
+
+  if (strstr(argv[0], "tcp_nat") != NULL)
+    {
+      is_tcp_nat = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "tcp_nat");
+    }
+  else if (strstr(argv[0], "tcp") != NULL)
+    {
+      is_tcp = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "tcp");
+    }
+  else if (strstr(argv[0], "https") != NULL)
+    {
+      is_https = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "https");
+    }
+  else if (strstr(argv[0], "http") != NULL)
+    {
+      is_http = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "http");
+    }
+  else if (strstr(argv[0], "udp") != NULL)
+    {
+      is_udp = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "udp");
+    }
+  else if (strstr(argv[0], "unix") != NULL)
+    {
+      is_unix = GNUNET_YES;
+      GNUNET_asprintf(&test_name, "unix");
+    }
+  GNUNET_log_setup ("test-transport-api-reliability",
+#if VERBOSE
+                    "DEBUG",
+#else
+                    "WARNING",
+#endif
+                    NULL);
+  ret = check ();
+  GNUNET_DISK_directory_remove ("/tmp/test-gnunetd-transport-peer-1");
+  GNUNET_DISK_directory_remove ("/tmp/test-gnunetd-transport-peer-2");
+  GNUNET_free_non_null(test_name);
+  return ret;
+}
+
+/* end of test_transport_api_reliability.c */