/* Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#include "or.h"
#include "buffers.h"
#include "config.h"
#include "test.h"

typedef struct socks_test_data_t {
  socks_request_t *req;
  buf_t *buf;
} socks_test_data_t;

static void *
socks_test_setup(const struct testcase_t *testcase)
{
  socks_test_data_t *data = tor_malloc(sizeof(socks_test_data_t));
  (void)testcase;
  data->buf = buf_new_with_capacity(256);
  data->req = socks_request_new();
  config_register_addressmaps(get_options());
  return data;
}
static int
socks_test_cleanup(const struct testcase_t *testcase, void *ptr)
{
  socks_test_data_t *data = ptr;
  (void)testcase;
  buf_free(data->buf);
  socks_request_free(data->req);
  tor_free(data);
  return 1;
}

static const struct testcase_setup_t socks_setup = {
  socks_test_setup, socks_test_cleanup
};

#define SOCKS_TEST_INIT()                       \
  socks_test_data_t *testdata = ptr;            \
  buf_t *buf = testdata->buf;                   \
  socks_request_t *socks = testdata->req;
#define ADD_DATA(buf, s)                                        \
  write_to_buf(s, sizeof(s)-1, buf)

static void
socks_request_clear(socks_request_t *socks)
{
  tor_free(socks->username);
  tor_free(socks->password);
  memset(socks, 0, sizeof(socks_request_t));
}

/** Perform unsupported SOCKS 4 commands */
static void
test_socks_4_unsupported_commands(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 4 Send BIND [02] to IP address 2.2.2.2:4369 */
  ADD_DATA(buf, "\x04\x02\x11\x11\x02\x02\x02\x02\x00");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == -1);
  tt_int_op(4,OP_EQ, socks->socks_version);
  tt_int_op(0,OP_EQ, socks->replylen); /* XXX: shouldn't tor reply? */

 done:
  ;
}

/** Perform supported SOCKS 4 commands */
static void
test_socks_4_supported_commands(void *ptr)
{
  SOCKS_TEST_INIT();

  tt_int_op(0,OP_EQ, buf_datalen(buf));

  /* SOCKS 4 Send CONNECT [01] to IP address 2.2.2.2:4370 */
  ADD_DATA(buf, "\x04\x01\x11\x12\x02\x02\x02\x03\x00");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(4,OP_EQ, socks->socks_version);
  tt_int_op(0,OP_EQ, socks->replylen); /* XXX: shouldn't tor reply? */
  tt_int_op(SOCKS_COMMAND_CONNECT,OP_EQ, socks->command);
  tt_str_op("2.2.2.3",OP_EQ, socks->address);
  tt_int_op(4370,OP_EQ, socks->port);
  tt_assert(socks->got_auth == 0);
  tt_assert(! socks->username);

  tt_int_op(0,OP_EQ, buf_datalen(buf));
  socks_request_clear(socks);

  /* SOCKS 4 Send CONNECT [01] to IP address 2.2.2.2:4369 with userid*/
  ADD_DATA(buf, "\x04\x01\x11\x12\x02\x02\x02\x04me\x00");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(4,OP_EQ, socks->socks_version);
  tt_int_op(0,OP_EQ, socks->replylen); /* XXX: shouldn't tor reply? */
  tt_int_op(SOCKS_COMMAND_CONNECT,OP_EQ, socks->command);
  tt_str_op("2.2.2.4",OP_EQ, socks->address);
  tt_int_op(4370,OP_EQ, socks->port);
  tt_assert(socks->got_auth == 1);
  tt_assert(socks->username);
  tt_int_op(2,OP_EQ, socks->usernamelen);
  tt_mem_op("me",OP_EQ, socks->username, 2);

  tt_int_op(0,OP_EQ, buf_datalen(buf));
  socks_request_clear(socks);

  /* SOCKS 4a Send RESOLVE [F0] request for torproject.org */
  ADD_DATA(buf, "\x04\xF0\x01\x01\x00\x00\x00\x02me\x00torproject.org\x00");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(4,OP_EQ, socks->socks_version);
  tt_int_op(0,OP_EQ, socks->replylen); /* XXX: shouldn't tor reply? */
  tt_str_op("torproject.org",OP_EQ, socks->address);

  tt_int_op(0,OP_EQ, buf_datalen(buf));

 done:
  ;
}

/**  Perform unsupported SOCKS 5 commands */
static void
test_socks_5_unsupported_commands(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 5 Send unsupported BIND [02] command */
  ADD_DATA(buf, "\x05\x02\x00\x01");

  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                               get_options()->SafeSocks),OP_EQ, 0);
  tt_int_op(0,OP_EQ, buf_datalen(buf));
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);
  ADD_DATA(buf, "\x05\x02\x00\x01\x02\x02\x02\x01\x01\x01");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                               get_options()->SafeSocks),OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_COMMAND_NOT_SUPPORTED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  buf_clear(buf);
  socks_request_clear(socks);

  /* SOCKS 5 Send unsupported UDP_ASSOCIATE [03] command */
  ADD_DATA(buf, "\x05\x02\x00\x01");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                               get_options()->SafeSocks),OP_EQ, 0);
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);
  ADD_DATA(buf, "\x05\x03\x00\x01\x02\x02\x02\x01\x01\x01");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                               get_options()->SafeSocks),OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_COMMAND_NOT_SUPPORTED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

 done:
  ;
}

/** Perform supported SOCKS 5 commands */
static void
test_socks_5_supported_commands(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 5 Send CONNECT [01] to IP address 2.2.2.2:4369 */
  ADD_DATA(buf, "\x05\x01\x00");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, 0);
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);

  ADD_DATA(buf, "\x05\x01\x00\x01\x02\x02\x02\x02\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, 1);
  tt_str_op("2.2.2.2",OP_EQ, socks->address);
  tt_int_op(4369,OP_EQ, socks->port);

  tt_int_op(0,OP_EQ, buf_datalen(buf));
  socks_request_clear(socks);

  /* SOCKS 5 Send CONNECT [01] to FQDN torproject.org:4369 */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\x01\x00\x03\x0Etorproject.org\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, 1);

  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);
  tt_str_op("torproject.org",OP_EQ, socks->address);
  tt_int_op(4369,OP_EQ, socks->port);

  tt_int_op(0,OP_EQ, buf_datalen(buf));
  socks_request_clear(socks);

  /* SOCKS 5 Send RESOLVE [F0] request for torproject.org:4369 */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\xF0\x00\x03\x0Etorproject.org\x01\x02");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);
  tt_str_op("torproject.org",OP_EQ, socks->address);

  tt_int_op(0,OP_EQ, buf_datalen(buf));
  socks_request_clear(socks);

  /* SOCKS 5 Should reject RESOLVE [F0] request for IPv4 address
   * string if SafeSocks is enabled. */

  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\xF0\x00\x03\x07");
  ADD_DATA(buf, "8.8.8.8");
  ADD_DATA(buf, "\x01\x02");
  tt_assert(fetch_from_buf_socks(buf,socks,get_options()->TestSocks,1)
            == -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_NOT_ALLOWED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  socks_request_clear(socks);

  /* SOCKS 5 should reject RESOLVE [F0] reject for IPv6 address
   * string if SafeSocks is enabled. */

  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\xF0\x00\x03\x27");
  ADD_DATA(buf, "2001:0db8:85a3:0000:0000:8a2e:0370:7334");
  ADD_DATA(buf, "\x01\x02");
  tt_assert(fetch_from_buf_socks(buf,socks,get_options()->TestSocks,1)
            == -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_NOT_ALLOWED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  socks_request_clear(socks);

  /* SOCKS 5 Send RESOLVE_PTR [F1] for IP address 2.2.2.5 */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\xF1\x00\x01\x02\x02\x02\x05\x01\x03");
  tt_assert(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);
  tt_str_op("2.2.2.5",OP_EQ, socks->address);

  tt_int_op(0,OP_EQ, buf_datalen(buf));

 done:
  ;
}

/**  Perform SOCKS 5 authentication */
static void
test_socks_5_no_authenticate(void *ptr)
{
  SOCKS_TEST_INIT();

  /*SOCKS 5 No Authentication */
  ADD_DATA(buf,"\x05\x01\x00");
  tt_assert(!fetch_from_buf_socks(buf, socks,
                                    get_options()->TestSocks,
                                    get_options()->SafeSocks));
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(SOCKS_NO_AUTH,OP_EQ, socks->reply[1]);

  tt_int_op(0,OP_EQ, buf_datalen(buf));

  /*SOCKS 5 Send username/password anyway - pretend to be broken */
  ADD_DATA(buf,"\x01\x02\x01\x01\x02\x01\x01");
  tt_assert(!fetch_from_buf_socks(buf, socks,
                                    get_options()->TestSocks,
                                    get_options()->SafeSocks));
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(1,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);

  tt_int_op(2,OP_EQ, socks->usernamelen);
  tt_int_op(2,OP_EQ, socks->passwordlen);

  tt_mem_op("\x01\x01",OP_EQ, socks->username, 2);
  tt_mem_op("\x01\x01",OP_EQ, socks->password, 2);

 done:
  ;
}

/** Perform SOCKS 5 authentication */
static void
test_socks_5_authenticate(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 5 Negotiate username/password authentication */
  ADD_DATA(buf, "\x05\x01\x02");

  tt_assert(!fetch_from_buf_socks(buf, socks,
                                   get_options()->TestSocks,
                                   get_options()->SafeSocks));
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(SOCKS_USER_PASS,OP_EQ, socks->reply[1]);
  tt_int_op(5,OP_EQ, socks->socks_version);

  tt_int_op(0,OP_EQ, buf_datalen(buf));

  /* SOCKS 5 Send username/password */
  ADD_DATA(buf, "\x01\x02me\x08mypasswd");
  tt_assert(!fetch_from_buf_socks(buf, socks,
                                   get_options()->TestSocks,
                                   get_options()->SafeSocks));
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(1,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);

  tt_int_op(2,OP_EQ, socks->usernamelen);
  tt_int_op(8,OP_EQ, socks->passwordlen);

  tt_mem_op("me",OP_EQ, socks->username, 2);
  tt_mem_op("mypasswd",OP_EQ, socks->password, 8);

 done:
  ;
}

/** Perform SOCKS 5 authentication and send data all in one go */
static void
test_socks_5_authenticate_with_data(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 5 Negotiate username/password authentication */
  ADD_DATA(buf, "\x05\x01\x02");

  tt_assert(!fetch_from_buf_socks(buf, socks,
                                   get_options()->TestSocks,
                                   get_options()->SafeSocks));
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(5,OP_EQ, socks->reply[0]);
  tt_int_op(SOCKS_USER_PASS,OP_EQ, socks->reply[1]);
  tt_int_op(5,OP_EQ, socks->socks_version);

  tt_int_op(0,OP_EQ, buf_datalen(buf));

  /* SOCKS 5 Send username/password */
  /* SOCKS 5 Send CONNECT [01] to IP address 2.2.2.2:4369 */
  ADD_DATA(buf, "\x01\x02me\x03you\x05\x01\x00\x01\x02\x02\x02\x02\x11\x11");
  tt_assert(fetch_from_buf_socks(buf, socks,
                                   get_options()->TestSocks,
                                   get_options()->SafeSocks) == 1);
  tt_int_op(5,OP_EQ, socks->socks_version);
  tt_int_op(2,OP_EQ, socks->replylen);
  tt_int_op(1,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);

  tt_str_op("2.2.2.2",OP_EQ, socks->address);
  tt_int_op(4369,OP_EQ, socks->port);

  tt_int_op(2,OP_EQ, socks->usernamelen);
  tt_int_op(3,OP_EQ, socks->passwordlen);
  tt_mem_op("me",OP_EQ, socks->username, 2);
  tt_mem_op("you",OP_EQ, socks->password, 3);

 done:
  ;
}

/** Perform SOCKS 5 authentication before method negotiated */
static void
test_socks_5_auth_before_negotiation(void *ptr)
{
  SOCKS_TEST_INIT();

  /* SOCKS 5 Send username/password */
  ADD_DATA(buf, "\x01\x02me\x02me");
  tt_assert(fetch_from_buf_socks(buf, socks,
                                   get_options()->TestSocks,
                                   get_options()->SafeSocks) == -1);
  tt_int_op(0,OP_EQ, socks->socks_version);
  tt_int_op(0,OP_EQ, socks->replylen);
  tt_int_op(0,OP_EQ, socks->reply[0]);
  tt_int_op(0,OP_EQ, socks->reply[1]);

 done:
  ;
}

/** Perform malformed SOCKS 5 commands */
static void
test_socks_5_malformed_commands(void *ptr)
{
  SOCKS_TEST_INIT();

  /* XXX: Stringified address length > MAX_SOCKS_ADDR_LEN will never happen */

  /** SOCKS 5 Send CONNECT [01] to IP address 2.2.2.2:4369, with SafeSocks set
   */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\x01\x00\x01\x02\x02\x02\x02\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks, 1),
            OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_NOT_ALLOWED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  buf_clear(buf);
  socks_request_clear(socks);

  /* SOCKS 5 Send RESOLVE_PTR [F1] for FQDN torproject.org */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\xF1\x00\x03\x0Etorproject.org\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  buf_clear(buf);
  socks_request_clear(socks);

  /* XXX: len + 1 > MAX_SOCKS_ADDR_LEN (FQDN request) will never happen */

  /* SOCKS 5 Send CONNECT [01] to FQDN """"".com */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\x01\x00\x03\x09\"\"\"\"\".com\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_GENERAL_ERROR,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

  buf_clear(buf);
  socks_request_clear(socks);

  /* SOCKS 5 Send CONNECT [01] to address type 0x23 */
  ADD_DATA(buf, "\x05\x01\x00");
  ADD_DATA(buf, "\x05\x01\x00\x23\x02\x02\x02\x02\x11\x11");
  tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks,
                                   get_options()->SafeSocks),OP_EQ, -1);

  tt_int_op(5,OP_EQ,socks->socks_version);
  tt_int_op(10,OP_EQ,socks->replylen);
  tt_int_op(5,OP_EQ,socks->reply[0]);
  tt_int_op(SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED,OP_EQ,socks->reply[1]);
  tt_int_op(1,OP_EQ,socks->reply[3]);

 done:
  ;
}

#define SOCKSENT(name)                                  \
  { #name, test_socks_##name, TT_FORK, &socks_setup, NULL }

struct testcase_t socks_tests[] = {
  SOCKSENT(4_unsupported_commands),
  SOCKSENT(4_supported_commands),

  SOCKSENT(5_unsupported_commands),
  SOCKSENT(5_supported_commands),
  SOCKSENT(5_no_authenticate),
  SOCKSENT(5_auth_before_negotiation),
  SOCKSENT(5_authenticate),
  SOCKSENT(5_authenticate_with_data),
  SOCKSENT(5_malformed_commands),

  END_OF_TESTCASES
};