/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
#define _POSIX_C_SOURCE 200112L /* https://stackoverflow.com/questions/37541985/storage-size-of-addrinfo-isnt-known */


#include <sys/wait.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

#include <thrift/c_glib/transport/thrift_transport.h>
#include <thrift/c_glib/transport/thrift_buffered_transport.h>
#include <thrift/c_glib/transport/thrift_server_transport.h>
#include <thrift/c_glib/transport/thrift_server_socket.h>
#include <thrift/c_glib/transport/thrift_ssl_socket.h>

/* #define TEST_DATA { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j' } */
#define TEST_DATA { "GET / HTTP/1.1\n\n" }


/* substituted functions to test failures of system and library calls */
static int socket_error = 0;
int
my_socket(int domain, int type, int protocol)
{
  if (socket_error == 0)
    {
      return socket (domain, type, protocol);
    }
  return -1;
}

static int recv_error = 0;
ssize_t
my_recv(int socket, void *buffer, size_t length, int flags)
{
  if (recv_error == 0)
    {
      return recv (socket, buffer, length, flags);
    }
  return -1;
}

static int send_error = 0;
ssize_t
my_send(int socket, const void *buffer, size_t length, int flags)
{
  if (send_error == 0)
    {
      return send (socket, buffer, length, flags);
    }
  return -1;
}

#define socket my_socket
#define recv my_recv
#define send my_send
#include "../src/thrift/c_glib/transport/thrift_ssl_socket.c"
#undef socket
#undef recv
#undef send

static void thrift_socket_server (const int port);

/* test object creation and destruction */
static void
test_ssl_create_and_destroy(void)
{
  gchar *hostname = NULL;
  guint port = 0;

  GObject *object = NULL;
  object = g_object_new (THRIFT_TYPE_SSL_SOCKET, NULL);
  g_assert (object != NULL);
  g_object_get (G_OBJECT(object), "hostname", &hostname, "port", &port, NULL);
  g_free (hostname);
  g_object_unref (object);
}

static void
test_ssl_create_and_set_properties(void)
{
  gchar *hostname = NULL;
  guint port = 0;
  SSL_CTX* ssl_ctx= NULL;
  GError *error=NULL;

  GObject *object = NULL;
  object = thrift_ssl_socket_new(SSLTLS, &error);
  g_object_get (G_OBJECT(object), "hostname", &hostname, "port", &port, "ssl_context", &ssl_ctx, NULL);
  g_assert (ssl_ctx!=NULL);

  g_free (hostname);
  g_object_unref (object);
}

static void
test_ssl_open_and_close_non_ssl_server(void)
{
  ThriftSSLSocket *tSSLSocket = NULL;
  ThriftTransport *transport = NULL;
  GError *error=NULL;
  pid_t pid;
  int non_ssl_port = 51198;
  char errormsg[255];


  pid = fork ();
  g_assert ( pid >= 0 );

  if ( pid == 0 )
    {
      /* child listens */
      /* This is a non SSL server */
      thrift_socket_server (non_ssl_port);
      exit (0);
    } else {
	/* parent connects, wait a bit for the socket to be created */
	sleep (1);

	/* open a connection and close it */
	tSSLSocket = thrift_ssl_socket_new_with_host(SSLTLS, "localhost", non_ssl_port, &error);

	transport = THRIFT_TRANSPORT (tSSLSocket);
	g_assert (thrift_ssl_socket_open (transport, &error) == FALSE);
	g_assert_cmpstr(error->message, == ,"Error while connect/bind: 68 -> Connection reset by peer");
	g_clear_error (&error);
	g_assert (thrift_ssl_socket_is_open (transport) == FALSE);
	thrift_ssl_socket_close (transport, NULL);
	g_assert (thrift_ssl_socket_is_open (transport) == FALSE);

	/* test close failure */
	THRIFT_SOCKET(tSSLSocket)->sd = -1;
	thrift_ssl_socket_close (transport, NULL);
	g_object_unref (tSSLSocket);

	/* try a hostname lookup failure */
	tSSLSocket = thrift_ssl_socket_new_with_host(SSLTLS, "localhost.broken", non_ssl_port, &error);
	transport = THRIFT_TRANSPORT (tSSLSocket);
	g_assert (thrift_ssl_socket_open (transport, &error) == FALSE);
	snprintf(errormsg, 255, "host lookup failed for localhost.broken:%d - Unknown host", non_ssl_port);
	g_assert_cmpstr(error->message, ==, errormsg);
	g_clear_error (&error);
	g_object_unref (tSSLSocket);
	error = NULL;

		/* try an error call to socket() */
	/*
		tSSLSocket = thrift_ssl_socket_new_with_host(SSLTLS, "localhost", port, &error);
		transport = THRIFT_TRANSPORT (tSSLSocket);
		socket_error = 1;
		assert (thrift_ssl_socket_open (transport, &error) == FALSE);
		socket_error = 0;
		g_object_unref (tSSLSocket);
		g_error_free (error);
	 */
    }
}

static void
test_ssl_write_invalid_socket(void)
{
  ThriftSSLSocket *tSSLSocket = NULL;
  ThriftTransport *transport = NULL;
  GError *error=NULL;
  char buffer[] = "this must not break";

  /* open a connection and close it */
  tSSLSocket = thrift_ssl_socket_new_with_host(SSLTLS, "localhost", 51188+1, &error);

  transport = THRIFT_TRANSPORT (tSSLSocket);
  g_assert (thrift_ssl_socket_open (transport, NULL) == FALSE);
  g_assert (thrift_ssl_socket_is_open (transport) == FALSE);

  /* FIXME This must be tested but since the assertion inside thrift_ssl_socket_write breaks the test unit
   it's disabled. They idea is to disable trap/coredump during this test
  g_assert (thrift_ssl_socket_write(transport, buffer, sizeof(buffer), &error) == FALSE);
  g_message ("write_failed_with_error: %s",
	     error != NULL ? error->message : "No");
  g_clear_error (&error);
  */
  thrift_ssl_socket_close (transport, NULL);
  g_assert (thrift_ssl_socket_is_open (transport) == FALSE);

  /* test close failure */
  THRIFT_SOCKET(tSSLSocket)->sd = -1;
  thrift_ssl_socket_close (transport, NULL);
  g_object_unref (tSSLSocket);
}



/**
 * Print the common name of certificate
 */
unsigned char * get_cn_name(X509_NAME* const name)
{
  int idx = -1;
  unsigned char *utf8 = NULL;

  do
    {
      if(!name) break; /* failed */

      idx = X509_NAME_get_index_by_NID(name, NID_commonName, -1);
      if(!(idx > -1))  break; /* failed */

      X509_NAME_ENTRY* entry = X509_NAME_get_entry(name, idx);
      if(!entry) break; /* failed */

      ASN1_STRING* data = X509_NAME_ENTRY_get_data(entry);
      if(!data) break; /* failed */

      int length = ASN1_STRING_to_UTF8(&utf8, data);
      if(!utf8 || !(length > 0))  break; /* failed */

    } while (0);
  return utf8;
}

/*
 * Handle IPV4 and IPV6 addr
 */
void *get_in_addr(struct sockaddr *sa)
{
  if (sa->sa_family == AF_INET)
    return &(((struct sockaddr_in*)sa)->sin_addr);
  return &(((struct sockaddr_in6*)sa)->sin6_addr);
}

int verify_ip(char * hostname, struct sockaddr_storage *addr)
{
  struct addrinfo *addr_info,*p;
  struct addrinfo hints;
  int res;
  int retval = 0;


  memset(&hints, 0, sizeof (struct addrinfo));
  hints.ai_family = AF_UNSPEC; /* use AF_INET6 to force IPv6 */
  hints.ai_socktype = SOCK_STREAM;


  if ( (res = getaddrinfo(hostname, NULL, &hints, &addr_info) ) != 0)
    {
      /* get the host info */
      g_error("Cannot get the host address");
      return retval;
    }
  /* loop through all the results and connect to the first we can */
  char dnshost[INET6_ADDRSTRLEN]; /* bigger addr supported IPV6 */
  char socket_ip[INET6_ADDRSTRLEN];
  if(inet_ntop(addr->ss_family, get_in_addr(addr), socket_ip, INET6_ADDRSTRLEN)==socket_ip){
      g_debug("We are connected to host %s checking against certificate...", socket_ip);
      int sizeip = socket_ip!=NULL ? strlen(socket_ip) : 0;
      for(p = addr_info; p != NULL; p = p->ai_next) {
	  if(inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr), dnshost, INET6_ADDRSTRLEN)==dnshost){
	      if(dnshost!=NULL){
		  g_info("DNS address [%i -> %s]", p->ai_addr, dnshost);
		  if(!strncmp(dnshost, socket_ip, sizeip)){
		      retval=1;
		      break; /* if we get here, we must have connected successfully */
		  }
	      }
	  }
      }
  }

  if(addr_info)
    freeaddrinfo(addr_info);

  return retval;
}

static void
read_from_file(char *buffer, long size, const char *file_name)
{
  char ch;
  long index=0;
  FILE *fp;

  fp = fopen(file_name,"r"); /* read mode */

  if( fp == NULL )
    {
      perror("Error while opening the file.\n");
      exit(EXIT_FAILURE);
    }

  printf("The contents of %s file are :\n", file_name);

  while(index<size && ( ch = fgetc(fp) ) != EOF ){
      buffer[index++] = ch;
  }

  fclose(fp);
}

#define ISSUER_CN_PINNING "The Apache Software Foundation"
#define SUBJECT_CN_PINNING "localhost"
#define CERT_SERIAL_NUMBER "1"

gboolean verify_certificate_sn(X509 *cert, const unsigned char *serial_number)
{
  gboolean retval = FALSE;

  ASN1_INTEGER *serial = X509_get_serialNumber(cert);

  BIGNUM *bn = ASN1_INTEGER_to_BN(serial, NULL);
  if (!bn) {
      fprintf(stderr, "unable to convert ASN1INTEGER to BN\n");
      return EXIT_FAILURE;
  }
  char *tmp = BN_bn2dec(bn);
  if (!tmp) {
      g_warning(stderr, "unable to convert BN to decimal string.\n");
      BN_free(bn);
      return EXIT_FAILURE;
  }
  /*
    if (strlen(tmp) >= len) {
      g_warn(stderr, "buffer length shorter than serial number\n");
      BN_free(bn);
      OPENSSL_free(tmp);
      return EXIT_FAILURE;
    }
  */
  if(!strncmp(serial_number, tmp, strlen(serial_number))){
      retval=TRUE;
  }else{
      g_warning("Serial number is not valid");
  }

  BN_free(bn);
  OPENSSL_free(tmp);
  return retval;
}

gboolean my_access_manager(ThriftTransport * transport, X509 *cert, struct sockaddr_storage *addr, GError **error)
{
  ThriftSSLSocket *sslSocket = THRIFT_SSL_SOCKET (transport);

  g_info("Processing access to the server");
  X509_NAME* iname = cert ? X509_get_issuer_name(cert) : NULL;
  X509_NAME* sname = cert ? X509_get_subject_name(cert) : NULL;

  /* Issuer is the authority we trust that warrants nothing useful */
  const unsigned char * issuer = get_cn_name(iname);
  if(issuer){
      gboolean valid = TRUE;
      g_info("Issuer (cn) %s", issuer);

      /* Issuer pinning */
      if(strncmp(ISSUER_CN_PINNING, issuer, strlen(ISSUER_CN_PINNING))){
	  g_warning("The Issuer of the certificate is not valid");
	  valid=FALSE;
      }
      OPENSSL_free(issuer);
      if(!valid)
	return valid;
  }


  /* Subject is who the certificate is issued to by the authority  */
  const unsigned char * subject = get_cn_name(sname);
  if(subject){
      g_info("Subject (cn) %s", subject);
      gboolean valid = TRUE;

      /* Subject pinning */
      if(strncmp(SUBJECT_CN_PINNING, subject, strlen(SUBJECT_CN_PINNING))){
	  g_warning("The subject of the certificate is not valid");
	  valid=FALSE;
      }

      if(!valid)
	return valid;

      /* Host pinning       */
      if(verify_ip(subject, addr)){
	  g_info("Verified subject");
      }else{
	  g_info("Cannot verify subject");
	  valid=FALSE;
      }
      OPENSSL_free(subject);

      if(!valid)
	return valid;
  }

  if(!verify_certificate_sn(cert, CERT_SERIAL_NUMBER)){
      return FALSE;
  }else{
      g_info("Verified serial number");
  }

  return TRUE;

}




#ifdef BUILD_SERVER
static void
test_ssl_authorization_manager(void)
{
  int status=0;
  pid_t pid;
  ThriftSSLSocket *tSSLsocket = NULL;
  ThriftTransport *transport = NULL;
  /*  int port = 51199; */
  int port = 443;
  GError *error=NULL;

  guchar buf[17] = TEST_DATA; /* a buffer */

/*
  pid = fork ();
    g_assert ( pid >= 0 );

    if ( pid == 0 )
    {
      thrift_ssl_socket_server (port);
      exit (0);
    } else {
	*/
  /* parent connects, wait a bit for the socket to be created */
  sleep (1);

  /* Test against level2 owncloud certificate */
  tSSLsocket = thrift_ssl_socket_new_with_host(SSLTLS, "localhost", port, &error);
  thrift_ssl_socket_set_manager(tSSLsocket, my_access_manager);           /* Install pinning manager */
  /* thrift_ssl_load_cert_from_file(tSSLsocket, "./owncloud.level2crm.pem"); */
  unsigned char cert_buffer[65534];
  read_from_file(cert_buffer, 65534, "../../keys/client.pem");
  if(!thrift_ssl_load_cert_from_buffer(tSSLsocket, cert_buffer)){
      g_warning("Certificates cannot be loaded!");
  }

  transport = THRIFT_TRANSPORT (tSSLsocket);
  g_assert (thrift_ssl_socket_open (transport, NULL) == TRUE);
  g_assert (thrift_ssl_socket_is_open (transport));

  thrift_ssl_socket_write (transport, buf, 17, NULL);

  /* write fail */
  send_error = 1;
  /*
      thrift_ssl_socket_write (transport, buf, 1, NULL);
     send_error = 0;
      thrift_ssl_socket_write_end (transport, NULL);
      thrift_ssl_socket_flush (transport, NULL);
      */
  thrift_ssl_socket_close (transport, NULL);
  g_object_unref (tSSLsocket);

  /*    g_assert ( wait (&status) == pid ); */
  g_assert ( status == 0 );
  /*  } */
}
#endif


static void
thrift_socket_server (const int port)
{
  int bytes = 0;
  ThriftServerTransport *transport = NULL;
  ThriftTransport *client = NULL;
  guchar buf[10]; /* a buffer */
  guchar match[10] = TEST_DATA;

  ThriftServerSocket *tsocket = g_object_new (THRIFT_TYPE_SERVER_SOCKET,
					      "port", port, NULL);

  transport = THRIFT_SERVER_TRANSPORT (tsocket);
  thrift_server_transport_listen (transport, NULL);
  client = thrift_server_transport_accept (transport, NULL);
  g_assert (client != NULL);

  /* read 10 bytes */
  bytes = thrift_ssl_socket_read (client, buf, 10, NULL);
  g_assert (bytes == 10); /* make sure we've read 10 bytes */
  g_assert ( memcmp(buf, match, 10) == 0 ); /* make sure what we got matches */

  /* failed read */
  recv_error = 1;
  thrift_ssl_socket_read (client, buf, 1, NULL);
  recv_error = 0;

  thrift_ssl_socket_read_end (client, NULL);
  thrift_ssl_socket_close (client, NULL);
  g_object_unref (tsocket);
  g_object_unref (client);
}

int
main(int argc, char *argv[])
{
  int retval;
#if (!GLIB_CHECK_VERSION (2, 36, 0))
  g_type_init();
#endif

  g_test_init (&argc, &argv, NULL);

  thrift_ssl_socket_initialize_openssl();

  g_test_add_func ("/testtransportsslsocket/CreateAndDestroy", test_ssl_create_and_destroy);
  g_test_add_func ("/testtransportsslsocket/CreateAndSetProperties", test_ssl_create_and_set_properties);
  g_test_add_func ("/testtransportsslsocket/OpenAndCloseNonSSLServer", test_ssl_open_and_close_non_ssl_server);
  g_test_add_func ("/testtransportsslsocket/OpenAndWriteInvalidSocket", test_ssl_write_invalid_socket);




  retval = g_test_run ();

  thrift_ssl_socket_finalize_openssl();

  return retval;
}