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tor/src/test/test_relaycell.c

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/* Copyright (c) 2014-2016, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/* Unit tests for handling different kinds of relay cell */
#define RELAY_PRIVATE
#include "or.h"
#include "config.h"
#include "connection.h"
#include "connection_edge.h"
#include "relay.h"
#include "test.h"
static int srm_ncalls;
static entry_connection_t *srm_conn;
static int srm_atype;
static size_t srm_alen;
static int srm_answer_is_set;
static uint8_t srm_answer[512];
static int srm_ttl;
static time_t srm_expires;
/* Mock replacement for connection_ap_hannshake_socks_resolved() */
static void
socks_resolved_mock(entry_connection_t *conn,
int answer_type,
size_t answer_len,
const uint8_t *answer,
int ttl,
time_t expires)
{
srm_ncalls++;
srm_conn = conn;
srm_atype = answer_type;
srm_alen = answer_len;
if (answer) {
memset(srm_answer, 0, sizeof(srm_answer));
memcpy(srm_answer, answer, answer_len < 512 ? answer_len : 512);
srm_answer_is_set = 1;
} else {
srm_answer_is_set = 0;
}
srm_ttl = ttl;
srm_expires = expires;
}
static int mum_ncalls;
static entry_connection_t *mum_conn;
static int mum_endreason;
/* Mock replacement for connection_mark_unattached_ap_() */
static void
mark_unattached_mock(entry_connection_t *conn, int endreason,
int line, const char *file)
{
++mum_ncalls;
mum_conn = conn;
mum_endreason = endreason;
(void) line;
(void) file;
}
/* Tests for connection_edge_process_resolved_cell().
The point of ..process_resolved_cell() is to handle an incoming cell
on an entry connection, and call connection_mark_unattached_ap() and/or
connection_ap_handshake_socks_resolved().
*/
static void
test_relaycell_resolved(void *arg)
{
entry_connection_t *entryconn;
edge_connection_t *edgeconn;
cell_t cell;
relay_header_t rh;
int r;
or_options_t *options = get_options_mutable();
#define SET_CELL(s) do { \
memset(&cell, 0, sizeof(cell)); \
memset(&rh, 0, sizeof(rh)); \
memcpy(cell.payload + RELAY_HEADER_SIZE, (s), sizeof((s))-1); \
rh.length = sizeof((s))-1; \
rh.command = RELAY_COMMAND_RESOLVED; \
} while (0)
#define MOCK_RESET() do { \
srm_ncalls = mum_ncalls = 0; \
} while (0)
#define ASSERT_MARK_CALLED(reason) do { \
tt_int_op(mum_ncalls, OP_EQ, 1); \
tt_ptr_op(mum_conn, OP_EQ, entryconn); \
tt_int_op(mum_endreason, OP_EQ, (reason)); \
} while (0)
#define ASSERT_RESOLVED_CALLED(atype, answer, ttl, expires) do { \
tt_int_op(srm_ncalls, OP_EQ, 1); \
tt_ptr_op(srm_conn, OP_EQ, entryconn); \
tt_int_op(srm_atype, OP_EQ, (atype)); \
if ((answer) != NULL) { \
tt_int_op(srm_alen, OP_EQ, sizeof(answer)-1); \
tt_int_op(srm_alen, OP_LT, 512); \
tt_int_op(srm_answer_is_set, OP_EQ, 1); \
tt_mem_op(srm_answer, OP_EQ, answer, sizeof(answer)-1); \
} else { \
tt_int_op(srm_answer_is_set, OP_EQ, 0); \
} \
tt_int_op(srm_ttl, OP_EQ, ttl); \
tt_i64_op(srm_expires, OP_EQ, expires); \
} while (0)
(void)arg;
MOCK(connection_mark_unattached_ap_, mark_unattached_mock);
MOCK(connection_ap_handshake_socks_resolved, socks_resolved_mock);
options->ClientDNSRejectInternalAddresses = 0;
SET_CELL(/* IPv4: 127.0.1.2, ttl 256 */
"\x04\x04\x7f\x00\x01\x02\x00\x00\x01\x00"
/* IPv4: 18.0.0.1, ttl 512 */
"\x04\x04\x12\x00\x00\x01\x00\x00\x02\x00"
/* IPv6: 2003::3, ttl 1024 */
"\x06\x10"
"\x20\x02\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x03"
"\x00\x00\x04\x00");
entryconn = entry_connection_new(CONN_TYPE_AP, AF_INET);
edgeconn = ENTRY_TO_EDGE_CONN(entryconn);
/* Try with connection in non-RESOLVE_WAIT state: cell gets ignored */
MOCK_RESET();
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
tt_int_op(srm_ncalls, OP_EQ, 0);
tt_int_op(mum_ncalls, OP_EQ, 0);
/* Now put it in the right state. */
ENTRY_TO_CONN(entryconn)->state = AP_CONN_STATE_RESOLVE_WAIT;
entryconn->socks_request->command = SOCKS_COMMAND_RESOLVE;
entryconn->entry_cfg.ipv4_traffic = 1;
entryconn->entry_cfg.ipv6_traffic = 1;
entryconn->entry_cfg.prefer_ipv6 = 0;
/* We prefer ipv4, so we should get the first ipv4 answer */
MOCK_RESET();
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_IPV4, "\x7f\x00\x01\x02", 256, -1);
/* But we may be discarding private answers. */
MOCK_RESET();
options->ClientDNSRejectInternalAddresses = 1;
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_IPV4, "\x12\x00\x00\x01", 512, -1);
/* now prefer ipv6, and get the first ipv6 answer */
entryconn->entry_cfg.prefer_ipv6 = 1;
MOCK_RESET();
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_IPV6,
"\x20\x02\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x03",
1024, -1);
/* With a cell that only has IPv4, we report IPv4 even if we prefer IPv6 */
MOCK_RESET();
SET_CELL("\x04\x04\x12\x00\x00\x01\x00\x00\x02\x00");
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_IPV4, "\x12\x00\x00\x01", 512, -1);
/* But if we don't allow IPv4, we report nothing if the cell contains only
* ipv4 */
MOCK_RESET();
entryconn->entry_cfg.ipv4_traffic = 0;
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_ERROR, NULL, -1, -1);
/* If we wanted hostnames, we report nothing, since we only had IPs. */
MOCK_RESET();
entryconn->entry_cfg.ipv4_traffic = 1;
entryconn->socks_request->command = SOCKS_COMMAND_RESOLVE_PTR;
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_ERROR, NULL, -1, -1);
/* A hostname cell is fine though. */
MOCK_RESET();
SET_CELL("\x00\x0fwww.example.com\x00\x01\x00\x00");
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_HOSTNAME, "www.example.com", 65536, -1);
/* error on malformed cell */
MOCK_RESET();
entryconn->socks_request->command = SOCKS_COMMAND_RESOLVE;
SET_CELL("\x04\x04\x01\x02\x03\x04"); /* no ttl */
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_TORPROTOCOL);
tt_int_op(srm_ncalls, OP_EQ, 0);
/* error on all addresses private */
MOCK_RESET();
SET_CELL(/* IPv4: 127.0.1.2, ttl 256 */
"\x04\x04\x7f\x00\x01\x02\x00\x00\x01\x00"
/* IPv4: 192.168.1.1, ttl 256 */
"\x04\x04\xc0\xa8\x01\x01\x00\x00\x01\x00");
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_TORPROTOCOL);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_ERROR_TRANSIENT, NULL, 0, TIME_MAX);
/* Legit error code */
MOCK_RESET();
SET_CELL("\xf0\x15" "quiet and meaningless" "\x00\x00\x0f\xff");
r = connection_edge_process_resolved_cell(edgeconn, &cell, &rh);
tt_int_op(r, OP_EQ, 0);
ASSERT_MARK_CALLED(END_STREAM_REASON_DONE|
END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED);
ASSERT_RESOLVED_CALLED(RESOLVED_TYPE_ERROR_TRANSIENT, NULL, -1, -1);
done:
UNMOCK(connection_mark_unattached_ap_);
UNMOCK(connection_ap_handshake_socks_resolved);
}
struct testcase_t relaycell_tests[] = {
{ "resolved", test_relaycell_resolved, TT_FORK, NULL, NULL },
END_OF_TESTCASES
};
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