2019-10-03 14:54:17 +02:00
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/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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2020-01-09 00:39:17 +01:00
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* Copyright (c) 2007-2020, The Tor Project, Inc. */
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2019-10-03 14:54:17 +02:00
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/* See LICENSE for licensing information */
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/**
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* @file resolve_test_helpers.c
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* @brief Helper functions for mocking libc's blocking hostname lookup
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* facilities.
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**/
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#define RESOLVE_PRIVATE
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#include "orconfig.h"
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#include "test/resolve_test_helpers.h"
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#include "lib/net/address.h"
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#include "lib/net/resolve.h"
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#include "test/test.h"
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#include <stdio.h>
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#include <string.h>
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/**
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* Mock replacement for our getaddrinfo/gethostbyname wrapper.
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**/
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static int
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replacement_host_lookup(const char *name, uint16_t family, tor_addr_t *addr)
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{
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static const struct lookup_table_ent {
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const char *name;
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const char *ipv4;
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const char *ipv6;
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} entries[] = {
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{ "localhost", "127.0.0.1", "::1" },
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{ "torproject.org", "198.51.100.6", "2001:DB8::700" },
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{ NULL, NULL, NULL },
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};
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int r = -1;
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for (unsigned i = 0; entries[i].name != NULL; ++i) {
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if (!strcasecmp(name, entries[i].name)) {
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if (family == AF_INET6) {
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int s = tor_addr_parse(addr, entries[i].ipv6);
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tt_int_op(s, OP_EQ, AF_INET6);
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} else {
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int s = tor_addr_parse(addr, entries[i].ipv4);
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tt_int_op(s, OP_EQ, AF_INET);
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}
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r = 0;
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break;
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}
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}
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log_debug(LD_GENERAL, "resolve(%s,%d) => %s",
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name, family, r == 0 ? fmt_addr(addr) : "-1");
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return r;
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done:
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return -1;
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}
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/**
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* Set up a mock replacement for our wrapper on libc's resolver code.
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*
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* According to our replacement, only "localhost" and "torproject.org"
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* are real addresses; everything else doesn't exist.
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*
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* Use this function to avoid using the DNS resolver during unit tests;
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* call unmock_hostname_resolver() when you're done.
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**/
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void
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mock_hostname_resolver(void)
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{
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MOCK(tor_addr_lookup_host_impl, replacement_host_lookup);
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}
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/**
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* Unmock our wrappers for libc's blocking hostname resolver code.
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**/
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void
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unmock_hostname_resolver(void)
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{
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UNMOCK(tor_addr_lookup_host_impl);
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}
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