test.c 18.5 KB
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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */

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#include <stdio.h>
#include <fcntl.h>

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#include "or.h"
#include "../common/test.h"

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void
setup_directory() {
  char buf[256];
  sprintf(buf, "/tmp/tor_test");
  if (mkdir(buf, 0700) && errno != EEXIST)
    fprintf(stderr, "Can't create directory %s", buf);
}

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void
test_buffers() {
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  char str[256];
  char str2[256];

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  char *buf;
  int buflen, buf_datalen;

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  char *buf2;
  int buf2len, buf2_datalen;

  int s, i, j, eof;
  z_compression *comp;
  z_decompression *decomp;

  /****
   * buf_new
   ****/
  if (buf_new(&buf, &buflen, &buf_datalen))
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    test_fail();
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  test_eq(buflen, MAX_BUF_SIZE);
  test_eq(buf_datalen, 0);

  /****
   * read_to_buf
   ****/
  s = open("/tmp/tor_test/data", O_WRONLY|O_CREAT|O_TRUNC, 0600);
  for (j=0;j<256;++j) {
    str[j] = (char)j;
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  }
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  write(s, str, 256);
  close(s);
  
  s = open("/tmp/tor_test/data", O_RDONLY, 0);
  eof = 0;
  i = read_to_buf(s, 10, &buf, &buflen, &buf_datalen, &eof);
  test_eq(buflen, MAX_BUF_SIZE);
  test_eq(buf_datalen, 10);
  test_eq(eof, 0);
  test_eq(i, 10);
  test_memeq(str, buf, 10);

  /* Test reading 0 bytes. */
  i = read_to_buf(s, 0, &buf, &buflen, &buf_datalen, &eof);
  test_eq(buflen, MAX_BUF_SIZE);
  test_eq(buf_datalen, 10);
  test_eq(eof, 0);
  test_eq(i, 0);
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  /* Now test when buffer is filled exactly. */
  buflen = 16;
  i = read_to_buf(s, 6, &buf, &buflen, &buf_datalen, &eof);
  test_eq(buflen, 16);
  test_eq(buf_datalen, 16);
  test_eq(eof, 0);
  test_eq(i, 6);
  test_memeq(str, buf, 16);
  
  /* Now test when buffer is filled with more data to read. */
  buflen = 32;
  i = read_to_buf(s, 128, &buf, &buflen, &buf_datalen, &eof);
  test_eq(buflen, 32);
  test_eq(buf_datalen, 32);
  test_eq(eof, 0);
  test_eq(i, 16);
  test_memeq(str, buf, 32);

  /* Now read to eof. */
  buflen = MAX_BUF_SIZE;
  test_assert(buflen > 256);
  i = read_to_buf(s, 1024, &buf, &buflen, &buf_datalen, &eof);
  test_eq(i, (256-32));
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  test_eq(buflen, MAX_BUF_SIZE);
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  test_eq(buf_datalen, 256);
  test_memeq(str, buf, 256);
  test_eq(eof, 0);

  i = read_to_buf(s, 1024, &buf, &buflen, &buf_datalen, &eof);
  test_eq(i, 0);
  test_eq(buflen, MAX_BUF_SIZE);
  test_eq(buf_datalen, 256);
  test_eq(eof, 1);

  close(s);

  /**** 
   * find_on_inbuf
   ****/

  test_eq(((int)'d') + 1, find_on_inbuf("abcd", 4, buf, buf_datalen));
  test_eq(-1, find_on_inbuf("xyzzy", 5, buf, buf_datalen));
  /* Make sure we don't look off the end of the buffef */
  buf[256] = 'A';
  buf[257] = 'X';
  test_eq(-1, find_on_inbuf("\xff" "A", 2, buf, buf_datalen));
  test_eq(-1, find_on_inbuf("AX", 2, buf, buf_datalen));
  /* Make sure we use the string length */
  test_eq(((int)'d')+1, find_on_inbuf("abcdX", 4, buf, buf_datalen));

  /****
   * fetch_from_buf
   ****/
  memset(str2, 255, 256);
  test_eq(246, fetch_from_buf(str2, 10, &buf, &buflen, &buf_datalen));
  test_memeq(str2, str, 10);
  test_memeq(str+10,buf,246);
  test_eq(buf_datalen,246);

  test_eq(-1, fetch_from_buf(str2, 247, &buf, &buflen, &buf_datalen));
  test_memeq(str+10,buf,246);
  test_eq(buf_datalen, 246);
  
  test_eq(0, fetch_from_buf(str2, 246, &buf, &buflen, &buf_datalen));
  test_memeq(str2, str+10, 246);
  test_eq(buflen,MAX_BUF_SIZE);
  test_eq(buf_datalen,0);

  /****
   * write_to_buf
   ****/
  memset(buf, (int)'-', 256);
  i = write_to_buf("Hello world", 11, &buf, &buflen, &buf_datalen);
  test_eq(i, 11);
  test_eq(buf_datalen, 11);
  test_memeq(buf, "Hello world", 11);
  i = write_to_buf("XYZZY", 5, &buf, &buflen, &buf_datalen);
  test_eq(i, 16);
  test_eq(buf_datalen, 16);
  test_memeq(buf, "Hello worldXYZZY", 16);
  /* Test when buffer is overfull. */
  buflen = 18;
  test_eq(-1, write_to_buf("This string will not fit.", 25, 
                           &buf, &buflen, &buf_datalen));
  test_eq(buf_datalen, 16);
  test_memeq(buf, "Hello worldXYZZY--", 18);
  buflen = MAX_BUF_SIZE;

  /****
   * flush_buf
   ****/
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  /* XXXX Needs tests. */
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  /***
   * compress_from_buf (simple)
   ***/
  buf_datalen = 0;
  comp = compression_new();
  for (i = 0; i < 20; ++i) {
    write_to_buf("Hello world.  ", 14, &buf, &buflen, &buf_datalen);
  }
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  i = compress_from_buf(str, 256, &buf, &buflen, &buf_datalen, comp, 
                        Z_SYNC_FLUSH);
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  test_eq(buf_datalen, 0);
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  /*
  for (j = 0; j <i ; ++j) {
    printf("%x '%c'\n", ((int) str[j])&0xff, str[j]);
  }
  */
  /* Now try decompressing. */
  decomp = decompression_new();
  if (buf_new(&buf2, &buf2len, &buf2_datalen))
    test_fail();
  buf_datalen = 0;
  test_eq(i, write_to_buf(str, i, &buf, &buflen, &buf_datalen));
  j = decompress_buf_to_buf(&buf, &buflen, &buf_datalen,
                            &buf2, &buf2len, &buf2_datalen,
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                            decomp, Z_SYNC_FLUSH);
  test_eq(buf2_datalen, 14*20);
  for (i = 0; i < 20; ++i) {
    test_memeq(buf2+(14*i), "Hello world.  ", 14);
  }
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  /* Now compress more, into less room. */
  for (i = 0; i < 20; ++i) {
    write_to_buf("Hello wxrlx.  ", 14, &buf, &buflen, &buf_datalen);
  }
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  i = compress_from_buf(str, 8, &buf, &buflen, &buf_datalen, comp, 
                        Z_SYNC_FLUSH);
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  test_eq(buf_datalen, 0);
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  test_eq(i, 8);
  memset(str+8,0,248);
  j = compress_from_buf(str+8, 248, &buf, &buflen, &buf_datalen, comp, 
                        Z_SYNC_FLUSH);
  /* test_eq(j, 2); XXXX This breaks, see below. */ 

  buf2_datalen=buf_datalen=0;
  write_to_buf(str, i+j, &buf, &buflen, &buf_datalen);
  memset(buf2, 0, buf2len);
  j = decompress_buf_to_buf(&buf, &buflen, &buf_datalen,
                            &buf2, &buf2len, &buf2_datalen,
                            decomp, Z_SYNC_FLUSH);
  test_eq(buf2_datalen, 14*20);
  for (i = 0; i < 20; ++i) {
    test_memeq(buf2+(14*i), "Hello wxrlx.  ", 14);
  }

  /* This situation is a bit messy.  We need to refactor our use of
   * zlib until the above code works.  Here's the problem: The zlib
   * documentation claims that we should reinvoke deflate immediately 
   * when the outbuf buffer is full and we get Z_OK, without adjusting
   * the input at all.  This implies that we need to tie a buffer to a
   * compression or decompression object.
   */
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  compression_free(comp);
  decompression_free(decomp);
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  buf_free(buf);
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  buf_free(buf2);
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}

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void
test_crypto_dh()
{
  crypto_dh_env_t *dh1, *dh2;
  char p1[CRYPTO_DH_SIZE];
  char p2[CRYPTO_DH_SIZE];
  char s1[CRYPTO_DH_SIZE];
  char s2[CRYPTO_DH_SIZE];

  dh1 = crypto_dh_new();
  dh2 = crypto_dh_new();
  test_eq(crypto_dh_get_bytes(dh1), CRYPTO_DH_SIZE);
  test_eq(crypto_dh_get_bytes(dh2), CRYPTO_DH_SIZE);

  memset(p1, 0, CRYPTO_DH_SIZE);
  memset(p2, 0, CRYPTO_DH_SIZE);
  test_memeq(p1, p2, CRYPTO_DH_SIZE);
  test_assert(! crypto_dh_get_public(dh1, p1, CRYPTO_DH_SIZE));
  test_memneq(p1, p2, CRYPTO_DH_SIZE);
  test_assert(! crypto_dh_get_public(dh2, p2, CRYPTO_DH_SIZE));
  test_memneq(p1, p2, CRYPTO_DH_SIZE);
  
  memset(s1, 0, CRYPTO_DH_SIZE);
  memset(s2, 0, CRYPTO_DH_SIZE);
  test_assert(! crypto_dh_compute_secret(dh1, p2, CRYPTO_DH_SIZE, s1));
  test_assert(! crypto_dh_compute_secret(dh2, p1, CRYPTO_DH_SIZE, s2));
  test_memeq(s1, s2, CRYPTO_DH_SIZE);
  
  crypto_dh_free(dh1);
  crypto_dh_free(dh2);
}

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void 
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test_crypto() 
{
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  crypto_cipher_env_t *env1, *env2;
  crypto_pk_env_t *pk1, *pk2;
  char *data1, *data2, *data3, *cp;
  FILE *f;
  int i, j;
  int str_ciphers[] = { CRYPTO_CIPHER_IDENTITY, 
                        CRYPTO_CIPHER_DES,
                        CRYPTO_CIPHER_RC4,
                        CRYPTO_CIPHER_3DES,
                        -1 };
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  data1 = malloc(1024);
  data2 = malloc(1024);
  data3 = malloc(1024);
  test_assert(data1 && data2 && data3);
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  /* Try out identity ciphers. */
  env1 = crypto_new_cipher_env(CRYPTO_CIPHER_IDENTITY);
  test_neq(env1, 0);
  test_eq(crypto_cipher_generate_key(env1), 0);
  test_eq(crypto_cipher_set_iv(env1, ""), 0);
  test_eq(crypto_cipher_encrypt_init_cipher(env1), 0);
  for(i = 0; i < 1024; ++i) {
    data1[i] = (char) i*73;
  }
  crypto_cipher_encrypt(env1, data1, 1024, data2); 
  test_memeq(data1, data2, 1024);
  crypto_free_cipher_env(env1);
  
  /* Now, test encryption and decryption with stream ciphers. */
  data1[0]='\0';
  for(i = 1023; i>0; i -= 35)
    strncat(data1, "Now is the time for all good onions", i);
  for(i=0; str_ciphers[i] >= 0; ++i) {
    /* For each cipher... */
    memset(data2, 0, 1024);
    memset(data3, 0, 1024);
    env1 = crypto_new_cipher_env(str_ciphers[i]);
    test_neq(env1, 0);
    env2 = crypto_new_cipher_env(str_ciphers[i]);
    test_neq(env2, 0);
    j = crypto_cipher_generate_key(env1);
    if (str_ciphers[i] != CRYPTO_CIPHER_IDENTITY) {
      crypto_cipher_set_key(env2, env1->key);
    }
    crypto_cipher_set_iv(env1, "12345678901234567890");
    crypto_cipher_set_iv(env2, "12345678901234567890");
    crypto_cipher_encrypt_init_cipher(env1);
    crypto_cipher_decrypt_init_cipher(env2);
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    /* Try encrypting 512 chars. */
    crypto_cipher_encrypt(env1, data1, 512, data2);
    crypto_cipher_decrypt(env2, data2, 512, data3);
    test_memeq(data1, data3, 512);
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    if (str_ciphers[i] == CRYPTO_CIPHER_IDENTITY) {
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      test_memeq(data1, data2, 512);
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    } else {
      test_memneq(data1, data2, 512);
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    }
    /* Now encrypt 1 at a time, and get 1 at a time. */
    for (j = 512; j < 560; ++j) {
      crypto_cipher_encrypt(env1, data1+j, 1, data2+j);
    }
    for (j = 512; j < 560; ++j) {
      crypto_cipher_decrypt(env2, data2+j, 1, data3+j);
    }
    test_memeq(data1, data3, 560);
    /* Now encrypt 3 at a time, and get 5 at a time. */
    for (j = 560; j < 1024; j += 3) {
      crypto_cipher_encrypt(env1, data1+j, 3, data2+j);
    }
    for (j = 560; j < 1024; j += 5) {
      crypto_cipher_decrypt(env2, data2+j, 5, data3+j);
    }
    test_memeq(data1, data3, 1024-4);
    /* Now make sure that when we encrypt with different chunk sizes, we get
       the same results. */
    crypto_free_cipher_env(env2);

    memset(data3, 0, 1024);
    env2 = crypto_new_cipher_env(str_ciphers[i]);
    test_neq(env2, 0);
    if (str_ciphers[i] != CRYPTO_CIPHER_IDENTITY) {
      crypto_cipher_set_key(env2, env1->key);
    }
    crypto_cipher_set_iv(env2, "12345678901234567890");
    crypto_cipher_encrypt_init_cipher(env2);
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    for (j = 0; j < 1024-16; j += 17) {
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      crypto_cipher_encrypt(env2, data1+j, 17, data3+j);
    }
    for (j= 0; j < 1024-16; ++j) {
      if (data2[j] != data3[j]) {
        printf("%d:  %d\t%d\n", j, (int) data2[j], (int) data3[j]);
      }
    }
    test_memeq(data2, data3, 1024-16);
    crypto_free_cipher_env(env1);
    crypto_free_cipher_env(env2);
  }
  
  /* Test vectors for stream ciphers. */
  /* XXXX Look up some test vectors for the ciphers and make sure we match. */

  /* Test SHA-1 with a test vector from the specification. */
  i = crypto_SHA_digest("abc", 3, data1);
  test_memeq(data1,
             "\xA9\x99\x3E\x36\x47\x06\x81\x6A\xBA\x3E\x25\x71\x78"
             "\x50\xC2\x6C\x9C\xD0\xD8\x9D", 20);

  /* Public-key ciphers */
  pk1 = crypto_new_pk_env(CRYPTO_PK_RSA);
  pk2 = crypto_new_pk_env(CRYPTO_PK_RSA);
  test_assert(pk1 && pk2);
  test_assert(! crypto_pk_generate_key(pk1));
  test_assert(! crypto_pk_write_public_key_to_string(pk1, &cp, &i));
  test_assert(! crypto_pk_read_public_key_from_string(pk2, cp, i));
  test_eq(0, crypto_pk_cmp_keys(pk1, pk2));

  test_eq(128, crypto_pk_keysize(pk1));
  test_eq(128, crypto_pk_keysize(pk2));
  
  test_eq(128, crypto_pk_public_encrypt(pk2, "Hello whirled.", 15, data1,
                                        RSA_PKCS1_OAEP_PADDING));
  test_eq(128, crypto_pk_public_encrypt(pk1, "Hello whirled.", 15, data2,
                                        RSA_PKCS1_OAEP_PADDING));
  /* oaep padding should make encryption not match */
  test_memneq(data1, data2, 128);
  test_eq(15, crypto_pk_private_decrypt(pk1, data1, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));
  test_streq(data3, "Hello whirled.");
  memset(data3, 0, 1024);
  test_eq(15, crypto_pk_private_decrypt(pk1, data2, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));
  test_streq(data3, "Hello whirled.");
  /* Can't decrypt with public key. */
  test_eq(-1, crypto_pk_private_decrypt(pk2, data2, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));
  /* Try again with bad padding */
  memcpy(data2+1, "XYZZY", 5);  /* This has fails ~ once-in-2^40 */
  test_eq(-1, crypto_pk_private_decrypt(pk1, data2, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));

  /* File operations: save and load private key */
  f = fopen("/tmp/tor_test/pkey1", "wb");
  test_assert(! crypto_pk_write_private_key_to_file(pk1, f));
  fclose(f);
  f = fopen("/tmp/tor_test/pkey1", "rb");
  test_assert(! crypto_pk_read_private_key_from_file(pk2, f));
  fclose(f);
  test_eq(15, crypto_pk_private_decrypt(pk2, data1, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));
  test_assert(! crypto_pk_read_private_key_from_filename(pk2, 
                                               "/tmp/tor_test/pkey1"));
  test_eq(15, crypto_pk_private_decrypt(pk2, data1, 128, data3,
                                        RSA_PKCS1_OAEP_PADDING));
    

  crypto_free_pk_env(pk1);  
  crypto_free_pk_env(pk2);  

  free(data1);
  free(data2);
  free(data3);
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}

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void 
test_util() {
  struct timeval start, end;

  start.tv_sec = 5;
  start.tv_usec = 5000;

  end.tv_sec = 5;
  end.tv_usec = 5000;

  test_eq(0L, tv_udiff(&start, &end));

  end.tv_usec = 7000;

  test_eq(2000L, tv_udiff(&start, &end));

  end.tv_sec = 6;

  test_eq(1002000L, tv_udiff(&start, &end));

  end.tv_usec = 0;

  test_eq(995000L, tv_udiff(&start, &end));

  end.tv_sec = 4;

  test_eq(0L, tv_udiff(&start, &end));

}

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void
test_onion_handshake() {
  /* client-side */
  crypto_dh_env_t *c_dh = NULL;
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  char c_buf[DH_ONIONSKIN_LEN];
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  char c_keys[40];

  /* server-side */
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  char s_buf[DH_KEY_LEN];
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  char s_keys[40];

  /* shared */
  crypto_pk_env_t *pk = NULL;

  pk = crypto_new_pk_env(CRYPTO_PK_RSA);
  test_assert(! crypto_pk_generate_key(pk));

  /* client handshake 1. */
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  memset(c_buf, 0, DH_ONIONSKIN_LEN);
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  test_assert(! onion_skin_create(pk, &c_dh, c_buf));

  /* server handshake */
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  memset(s_buf, 0, DH_KEY_LEN);
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  memset(s_keys, 0, 40);
  test_assert(! onion_skin_server_handshake(c_buf, pk, s_buf, s_keys, 40));
  
  /* client handshake 2 */
  memset(c_keys, 0, 40);
  test_assert(! onion_skin_client_handshake(c_dh, s_buf, c_keys, 40));
  
  crypto_dh_free(c_dh);
  crypto_free_pk_env(pk);

  test_memeq(c_keys, s_keys, 40);
  memset(s_buf, 0, 40);
  test_memneq(c_keys, s_buf, 40);
}

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/* from main.c */
int dump_router_to_string(char *s, int maxlen, routerinfo_t *router);
void dump_directory_to_string(char *s, int maxlen);

void
test_dir_format()
{
  
  char buf[2048], buf2[512];
  char *pk1_str, *pk2_str, *cp;
  int pk1_str_len, pk2_str_len;
  routerinfo_t r1, r2;
  crypto_pk_env_t *pk1 = NULL, *pk2 = NULL;
  routerinfo_t *rp1, *rp2;
  struct exit_policy_t ex1, ex2, ex3;

  int i;

  test_assert( (pk1 = crypto_new_pk_env(CRYPTO_PK_RSA)) );
  test_assert( (pk2 = crypto_new_pk_env(CRYPTO_PK_RSA)) );
  test_assert(! crypto_pk_generate_key(pk1));
  test_assert(! crypto_pk_generate_key(pk2));
  
  r1.address = "testaddr1.foo.bar";
  r1.addr = 0xc0a80001u; /* 192.168.0.1 */
  r1.or_port = 9000;
  r1.op_port = 9001;
  r1.ap_port = 9002;
  r1.dir_port = 9003;
  r1.pkey = pk1;
  r1.bandwidth = 1000;
  r1.exit_policy = NULL;
  r1.next = &r2;

  ex1.policy_type = EXIT_POLICY_ACCEPT;
  ex1.string = NULL;
  ex1.address = "*";
  ex1.port = "80";
  ex1.next = &ex2;
  ex2.policy_type = EXIT_POLICY_REJECT;
  ex2.address = "18.*";
  ex2.port = "24";
  ex2.next = NULL;
  r2.address = "tor.tor.tor";
  r2.addr = 0x0a030201u; /* 10.3.2.1 */
  r2.or_port = 9005;
  r2.op_port = 0;
  r2.ap_port = 0;
  r2.dir_port = 0;
  r2.pkey = pk2;
  r2.bandwidth = 3000;
  r2.exit_policy = &ex1;
  r2.next = NULL;

  test_assert(!crypto_pk_write_public_key_to_string(pk1, &pk1_str, 
                                                    &pk1_str_len));
  test_assert(!crypto_pk_write_public_key_to_string(pk2 , &pk2_str, 
                                                    &pk2_str_len));
  strcpy(buf2, "router testaddr1.foo.bar 9000 9001 9002 9003 1000\n");
  strcat(buf2, pk1_str);
  strcat(buf2, "\n");
  
  memset(buf, 0, 2048);
  test_assert(dump_router_to_string(buf, 2048, &r1)>0);
  test_streq(buf, buf2);

  cp = buf;
  rp1 = router_get_entry_from_string(&cp);
  test_assert(rp1);
  test_streq(rp1->address, r1.address);
  test_eq(rp1->or_port, r1.or_port);
  test_eq(rp1->op_port, r1.op_port);
  test_eq(rp1->ap_port, r1.ap_port);
  test_eq(rp1->dir_port, r1.dir_port);
  test_eq(rp1->bandwidth, r1.bandwidth);
  test_assert(crypto_pk_cmp_keys(rp1->pkey, pk1) == 0);
  test_assert(rp1->exit_policy == NULL);

  strcpy(buf2, "router tor.tor.tor 9005 0 0 0 3000\n");
  strcat(buf2, pk2_str);
  strcat(buf2, "accept *:80\nreject 18.*:24\n\n");
  test_assert(dump_router_to_string(buf, 2048, &r2)>0);
  test_streq(buf, buf2);

  cp = buf;
  rp2 = router_get_entry_from_string(&cp);
  test_assert(rp2);
  test_streq(rp2->address, r2.address);
  test_eq(rp2->or_port, r2.or_port);
  test_eq(rp2->op_port, r2.op_port);
  test_eq(rp2->ap_port, r2.ap_port);
  test_eq(rp2->dir_port, r2.dir_port);
  test_eq(rp2->bandwidth, r2.bandwidth);
  test_assert(crypto_pk_cmp_keys(rp2->pkey, pk2) == 0);
  test_eq(rp2->exit_policy->policy_type, EXIT_POLICY_ACCEPT);
  test_streq(rp2->exit_policy->string, "accept *:80");
  test_streq(rp2->exit_policy->address, "*");
  test_streq(rp2->exit_policy->port, "80");
  test_eq(rp2->exit_policy->next->policy_type, EXIT_POLICY_REJECT);
  test_streq(rp2->exit_policy->next->string, "reject 18.*:24");
  test_streq(rp2->exit_policy->next->address, "18.*");
  test_streq(rp2->exit_policy->next->port, "24");
  test_assert(rp2->exit_policy->next->next == NULL);
  
  
  /* XXXX free everything*/
}

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int 
main(int c, char**v) {
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#if 0
  or_options_t options; /* command-line and config-file options */

  if(getconfig(c,v,&options))
    exit(1);
#endif
  log(LOG_ERR,NULL);         /* make logging quieter */

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  setup_directory();
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#if 1
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  puts("========================== Buffers =========================");
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  test_buffers();
  puts("========================== Crypto ==========================");
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  test_crypto_dh();
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  test_crypto();
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  puts("\n========================= Util ============================");
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  test_util();
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  puts("\n========================= Onion Skins =====================");
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  test_onion_handshake();
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#endif
  puts("\n========================= Directory Formats ===============");
  test_dir_format();
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  puts("");
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  return 0;
}

/*
  Local Variables:
  mode:c
  indent-tabs-mode:nil
  c-basic-offset:2
  End:
*/