424 lines
14 KiB
C
424 lines
14 KiB
C
/* Copyright (c) 2014-2016, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#define DIRSERV_PRIVATE
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#define ROUTERPARSE_PRIVATE
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#define NETWORKSTATUS_PRIVATE
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#include "orconfig.h"
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#include "or.h"
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#include "config.h"
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#include "dirserv.h"
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#include "container.h"
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#include "entrynodes.h"
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#include "util.h"
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#include "routerparse.h"
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#include "networkstatus.h"
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#include "test.h"
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#include "test_helpers.h"
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#include "log_test_helpers.h"
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/** Generate a vote_routerstatus_t for a router with identity digest
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* <b>digest_in_hex</b>. */
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static vote_routerstatus_t *
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gen_vote_routerstatus_for_tests(const char *digest_in_hex, int is_guard)
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{
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int retval;
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vote_routerstatus_t *vrs = NULL;
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routerstatus_t *rs;
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vrs = tor_malloc_zero(sizeof(vote_routerstatus_t));
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rs = &vrs->status;
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{ /* Useful information for tests */
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char digest_tmp[DIGEST_LEN];
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/* Guard or not? */
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rs->is_possible_guard = is_guard;
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/* Fill in the fpr */
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tt_int_op(strlen(digest_in_hex), ==, HEX_DIGEST_LEN);
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retval = base16_decode(digest_tmp, sizeof(digest_tmp),
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digest_in_hex, HEX_DIGEST_LEN);
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tt_int_op(retval, ==, sizeof(digest_tmp));
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memcpy(rs->identity_digest, digest_tmp, DIGEST_LEN);
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}
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{ /* Misc info (maybe not used in tests) */
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vrs->version = tor_strdup("0.1.2.14");
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strlcpy(rs->nickname, "router2", sizeof(rs->nickname));
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memset(rs->descriptor_digest, 78, DIGEST_LEN);
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rs->addr = 0x99008801;
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rs->or_port = 443;
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rs->dir_port = 8000;
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/* all flags but running cleared */
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rs->is_flagged_running = 1;
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vrs->has_measured_bw = 1;
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rs->has_bandwidth = 1;
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}
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return vrs;
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done:
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vote_routerstatus_free(vrs);
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return NULL;
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}
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/** Make sure our parsers reject corrupted guardfraction files. */
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static void
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test_parse_guardfraction_file_bad(void *arg)
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{
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int retval;
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char *guardfraction_bad = NULL;
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const char *yesterday_date_str = get_yesterday_date_str();
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(void) arg;
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/* Start parsing all those corrupted guardfraction files! */
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/* Guardfraction file version is not a number! */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version nan\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 100 420\n"
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"guard-seen 07B5547026DF3E229806E135CFA8552D56AFBABC 5 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, -1);
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tor_free(guardfraction_bad);
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/* This one does not have a date! Parsing should fail. */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at not_date\n"
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"n-inputs 420 3\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 100 420\n"
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"guard-seen 07B5547026DF3E229806E135CFA8552D56AFBABC 5 420\n");
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, -1);
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tor_free(guardfraction_bad);
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/* This one has an incomplete n-inputs line, but parsing should
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still continue. */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs biggie\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 100 420\n"
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"guard-seen 07B5547026DF3E229806E135CFA8552D56AFBABC 5 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, 2);
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tor_free(guardfraction_bad);
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/* This one does not have a fingerprint in the guard line! */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen not_a_fingerprint 100 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, 0);
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tor_free(guardfraction_bad);
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/* This one does not even have an integer guardfraction value. */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 NaN 420\n"
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"guard-seen 07B5547026DF3E229806E135CFA8552D56AFBABC 5 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, 1);
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tor_free(guardfraction_bad);
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/* This one is not a percentage (not in [0, 100]) */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 666 420\n"
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"guard-seen 07B5547026DF3E229806E135CFA8552D56AFBABC 5 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, 1);
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tor_free(guardfraction_bad);
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/* This one is not a percentage either (not in [0, 100]) */
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tor_asprintf(&guardfraction_bad,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777 -3 420\n",
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yesterday_date_str);
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_bad, NULL);
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tt_int_op(retval, ==, 0);
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done:
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tor_free(guardfraction_bad);
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}
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/** Make sure that our test guardfraction file gets parsed properly, and
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* its information are applied properly to our routerstatuses. */
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static void
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test_parse_guardfraction_file_good(void *arg)
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{
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int retval;
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vote_routerstatus_t *vrs_guard = NULL;
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vote_routerstatus_t *vrs_dummy = NULL;
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char *guardfraction_good = NULL;
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const char *yesterday_date_str = get_yesterday_date_str();
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smartlist_t *routerstatuses = smartlist_new();
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/* Some test values that we need to validate later */
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const char fpr_guard[] = "D0EDB47BEAD32D26D0A837F7D5357EC3AD3B8777";
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const char fpr_unlisted[] = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
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const int guardfraction_value = 42;
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(void) arg;
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{
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/* Populate the smartlist with some fake routerstatuses, so that
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after parsing the guardfraction file we can check that their
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elements got filled properly. */
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/* This one is a guard */
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vrs_guard = gen_vote_routerstatus_for_tests(fpr_guard, 1);
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tt_assert(vrs_guard);
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smartlist_add(routerstatuses, vrs_guard);
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/* This one is a guard but it's not in the guardfraction file */
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vrs_dummy = gen_vote_routerstatus_for_tests(fpr_unlisted, 1);
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tt_assert(vrs_dummy);
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smartlist_add(routerstatuses, vrs_dummy);
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}
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tor_asprintf(&guardfraction_good,
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"guardfraction-file-version 1\n"
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"written-at %s\n"
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"n-inputs 420 3\n"
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"guard-seen %s %d 420\n",
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yesterday_date_str,
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fpr_guard, guardfraction_value);
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/* Read the guardfraction file */
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retval = dirserv_read_guardfraction_file_from_str(guardfraction_good,
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routerstatuses);
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tt_int_op(retval, ==, 1);
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{ /* Test that routerstatus fields got filled properly */
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/* The guardfraction fields of the guard should be filled. */
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tt_assert(vrs_guard->status.has_guardfraction);
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tt_int_op(vrs_guard->status.guardfraction_percentage,
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==,
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guardfraction_value);
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/* The guard that was not in the guardfraction file should not have
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been touched either. */
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tt_assert(!vrs_dummy->status.has_guardfraction);
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}
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done:
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vote_routerstatus_free(vrs_guard);
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vote_routerstatus_free(vrs_dummy);
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smartlist_free(routerstatuses);
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tor_free(guardfraction_good);
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}
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/** Make sure that the guardfraction bandwidths get calculated properly. */
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static void
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test_get_guardfraction_bandwidth(void *arg)
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{
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guardfraction_bandwidth_t gf_bw;
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const int orig_bw = 1000;
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(void) arg;
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/* A guard with bandwidth 1000 and GuardFraction 0.25, should have
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bandwidth 250 as a guard and bandwidth 750 as a non-guard. */
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guard_get_guardfraction_bandwidth(&gf_bw,
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orig_bw, 25);
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tt_int_op(gf_bw.guard_bw, ==, 250);
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tt_int_op(gf_bw.non_guard_bw, ==, 750);
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/* Also check the 'guard_bw + non_guard_bw == original_bw'
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* invariant. */
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tt_int_op(gf_bw.non_guard_bw + gf_bw.guard_bw, ==, orig_bw);
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done:
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;
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}
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/** Parse the GuardFraction element of the consensus, and make sure it
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* gets parsed correctly. */
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static void
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test_parse_guardfraction_consensus(void *arg)
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{
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int retval;
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or_options_t *options = get_options_mutable();
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const char *guardfraction_str_good = "GuardFraction=66";
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routerstatus_t rs_good;
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routerstatus_t rs_no_guard;
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const char *guardfraction_str_bad1 = "GuardFraction="; /* no value */
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routerstatus_t rs_bad1;
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const char *guardfraction_str_bad2 = "GuardFraction=166"; /* no percentage */
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routerstatus_t rs_bad2;
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(void) arg;
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/* GuardFraction use is currently disabled by default. So we need to
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manually enable it. */
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options->UseGuardFraction = 1;
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{ /* Properly formatted GuardFraction. Check that it gets applied
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correctly. */
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memset(&rs_good, 0, sizeof(routerstatus_t));
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rs_good.is_possible_guard = 1;
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retval = routerstatus_parse_guardfraction(guardfraction_str_good,
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NULL, NULL,
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&rs_good);
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tt_int_op(retval, ==, 0);
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tt_assert(rs_good.has_guardfraction);
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tt_int_op(rs_good.guardfraction_percentage, ==, 66);
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}
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{ /* Properly formatted GuardFraction but router is not a
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guard. GuardFraction should not get applied. */
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memset(&rs_no_guard, 0, sizeof(routerstatus_t));
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tt_assert(!rs_no_guard.is_possible_guard);
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setup_full_capture_of_logs(LOG_WARN);
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retval = routerstatus_parse_guardfraction(guardfraction_str_good,
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NULL, NULL,
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&rs_no_guard);
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tt_int_op(retval, ==, 0);
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tt_assert(!rs_no_guard.has_guardfraction);
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expect_single_log_msg_containing("Got GuardFraction for non-guard . "
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"This is not supposed to happen.");
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teardown_capture_of_logs();
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}
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{ /* Bad GuardFraction. Function should fail and not apply. */
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memset(&rs_bad1, 0, sizeof(routerstatus_t));
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rs_bad1.is_possible_guard = 1;
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retval = routerstatus_parse_guardfraction(guardfraction_str_bad1,
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NULL, NULL,
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&rs_bad1);
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tt_int_op(retval, ==, -1);
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tt_assert(!rs_bad1.has_guardfraction);
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}
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{ /* Bad GuardFraction. Function should fail and not apply. */
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memset(&rs_bad2, 0, sizeof(routerstatus_t));
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rs_bad2.is_possible_guard = 1;
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retval = routerstatus_parse_guardfraction(guardfraction_str_bad2,
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NULL, NULL,
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&rs_bad2);
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tt_int_op(retval, ==, -1);
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tt_assert(!rs_bad2.has_guardfraction);
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}
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done:
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teardown_capture_of_logs();
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}
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/** Make sure that we use GuardFraction information when we should,
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* according to the torrc option and consensus parameter. */
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static void
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test_should_apply_guardfraction(void *arg)
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{
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networkstatus_t vote_enabled, vote_disabled, vote_missing;
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or_options_t *options = get_options_mutable();
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(void) arg;
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{ /* Fill the votes for later */
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/* This one suggests enabled GuardFraction. */
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memset(&vote_enabled, 0, sizeof(vote_enabled));
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vote_enabled.net_params = smartlist_new();
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smartlist_split_string(vote_enabled.net_params,
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"UseGuardFraction=1", NULL, 0, 0);
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/* This one suggests disabled GuardFraction. */
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memset(&vote_disabled, 0, sizeof(vote_disabled));
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vote_disabled.net_params = smartlist_new();
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smartlist_split_string(vote_disabled.net_params,
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"UseGuardFraction=0", NULL, 0, 0);
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/* This one doesn't have GuardFraction at all. */
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memset(&vote_missing, 0, sizeof(vote_missing));
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vote_missing.net_params = smartlist_new();
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smartlist_split_string(vote_missing.net_params,
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"leon=trout", NULL, 0, 0);
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}
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/* If torrc option is set to yes, we should always use
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* guardfraction.*/
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options->UseGuardFraction = 1;
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tt_int_op(should_apply_guardfraction(&vote_disabled), ==, 1);
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/* If torrc option is set to no, we should never use
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* guardfraction.*/
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options->UseGuardFraction = 0;
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tt_int_op(should_apply_guardfraction(&vote_enabled), ==, 0);
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/* Now let's test torrc option set to auto. */
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options->UseGuardFraction = -1;
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/* If torrc option is set to auto, and consensus parameter is set to
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* yes, we should use guardfraction. */
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tt_int_op(should_apply_guardfraction(&vote_enabled), ==, 1);
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/* If torrc option is set to auto, and consensus parameter is set to
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* no, we should use guardfraction. */
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tt_int_op(should_apply_guardfraction(&vote_disabled), ==, 0);
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/* If torrc option is set to auto, and consensus parameter is not
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* set, we should fallback to "no". */
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tt_int_op(should_apply_guardfraction(&vote_missing), ==, 0);
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done:
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SMARTLIST_FOREACH(vote_enabled.net_params, char *, cp, tor_free(cp));
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SMARTLIST_FOREACH(vote_disabled.net_params, char *, cp, tor_free(cp));
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SMARTLIST_FOREACH(vote_missing.net_params, char *, cp, tor_free(cp));
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smartlist_free(vote_enabled.net_params);
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smartlist_free(vote_disabled.net_params);
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smartlist_free(vote_missing.net_params);
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}
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struct testcase_t guardfraction_tests[] = {
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{ "parse_guardfraction_file_bad", test_parse_guardfraction_file_bad,
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TT_FORK, NULL, NULL },
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{ "parse_guardfraction_file_good", test_parse_guardfraction_file_good,
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TT_FORK, NULL, NULL },
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{ "parse_guardfraction_consensus", test_parse_guardfraction_consensus,
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TT_FORK, NULL, NULL },
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{ "get_guardfraction_bandwidth", test_get_guardfraction_bandwidth,
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TT_FORK, NULL, NULL },
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{ "should_apply_guardfraction", test_should_apply_guardfraction,
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TT_FORK, NULL, NULL },
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END_OF_TESTCASES
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};
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