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promote errors in parsing listen_interfaces to post listen_failed_alert

This commit is contained in:
arvidn 2019-12-07 16:12:47 +01:00 committed by Arvid Norberg
parent 41dab18644
commit 59a29a44e2
5 changed files with 154 additions and 88 deletions
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1
ChangeLog
View File

@ -1,3 +1,4 @@
* promote errors in parsing listen_interfaces to post listen_failed_alert
* fix bug in protocol encryption/obfuscation
* fix buffer overflow in SOCKS5 UDP logic
* fix issue of rapid calls to file_priority() clobbering each other

15
include/libtorrent/string_util.hpp
View File

@ -36,6 +36,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include "libtorrent/config.hpp"
#include "libtorrent/string_view.hpp"
#include "libtorrent/span.hpp"
#include "libtorrent/error_code.hpp"
#include <vector>
#include <string>
@ -60,6 +61,9 @@ namespace libtorrent {
url += '/';
}
// internal
TORRENT_EXTRA_EXPORT string_view strip_string(string_view in);
TORRENT_EXTRA_EXPORT bool is_print(char c);
TORRENT_EXTRA_EXPORT bool is_space(char c);
TORRENT_EXTRA_EXPORT char to_lower(char c);
@ -80,16 +84,25 @@ namespace libtorrent {
std::string device;
int port;
bool ssl;
friend bool operator==(listen_interface_t const& lhs, listen_interface_t const& rhs)
{
return lhs.device == rhs.device
&& lhs.port == rhs.port
&& lhs.ssl == rhs.ssl;
}
};
// this parses the string that's used as the listen_interfaces setting.
// it is a comma-separated list of IP or device names with ports. For
// example: "eth0:6881,eth1:6881" or "127.0.0.1:6881"
TORRENT_EXTRA_EXPORT std::vector<listen_interface_t> parse_listen_interfaces(
std::string const& in);
std::string const& in, std::vector<std::string>& errors);
#if TORRENT_ABI_VERSION == 1 \
|| !defined TORRENT_DISABLE_LOGGING
TORRENT_EXTRA_EXPORT std::string print_listen_interfaces(
std::vector<listen_interface_t> const& in);
#endif
// this parses the string that's used as the listen_interfaces setting.
// it is a comma-separated list of IP or device names with ports. For

17
src/session_impl.cpp
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@ -5192,8 +5192,9 @@ namespace aux {
// this function maps the previous functionality of just setting the ssl
// listen port in order to enable the ssl listen sockets, to the new
// mechanism where SSL sockets are specified in listen_interfaces.
std::vector<std::string> ignore;
auto current_ifaces = parse_listen_interfaces(
m_settings.get_str(settings_pack::listen_interfaces));
m_settings.get_str(settings_pack::listen_interfaces), ignore);
// these are the current interfaces we have, first remove all the SSL
// interfaces
current_ifaces.erase(std::remove_if(current_ifaces.begin(), current_ifaces.end()
@ -5227,16 +5228,18 @@ namespace aux {
INVARIANT_CHECK;
std::string const net_interfaces = m_settings.get_str(settings_pack::listen_interfaces);
m_listen_interfaces = parse_listen_interfaces(net_interfaces);
std::vector<std::string> err;
m_listen_interfaces = parse_listen_interfaces(net_interfaces, err);
for (auto const& e : err)
{
m_alerts.emplace_alert<listen_failed_alert>(e, lt::address{}, 0
, operation_t::parse_address, errors::invalid_port, lt::socket_type_t::tcp);
}
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
if (!net_interfaces.empty() && m_listen_interfaces.empty())
{
session_log("ERROR: failed to parse listen_interfaces setting: %s"
, net_interfaces.c_str());
}
session_log("update listen interfaces: %s", net_interfaces.c_str());
session_log("parsed listen interfaces count: %d, ifaces: %s"
, int(m_listen_interfaces.size())

121
src/string_util.cpp
View File

@ -149,6 +149,8 @@ namespace libtorrent {
return tmp;
}
#if TORRENT_ABI_VERSION == 1 \
|| !defined TORRENT_DISABLE_LOGGING
std::string print_listen_interfaces(std::vector<listen_interface_t> const& in)
{
std::string ret;
@ -176,92 +178,101 @@ namespace libtorrent {
return ret;
}
#endif
string_view strip_string(string_view in)
{
while (!in.empty() && is_space(in.front()))
in.remove_prefix(1);
while (!in.empty() && is_space(in.back()))
in.remove_suffix(1);
return in;
}
// this parses the string that's used as the listen_interfaces setting.
// it is a comma-separated list of IP or device names with ports. For
// example: "eth0:6881,eth1:6881" or "127.0.0.1:6881"
std::vector<listen_interface_t> parse_listen_interfaces(std::string const& in)
std::vector<listen_interface_t> parse_listen_interfaces(std::string const& in
, std::vector<std::string>& err)
{
std::vector<listen_interface_t> out;
std::string::size_type start = 0;
while (start < in.size())
string_view rest = in;
while (!rest.empty())
{
// skip leading spaces
while (start < in.size() && is_space(in[start]))
++start;
string_view element;
std::tie(element, rest) = split_string(rest, ',');
if (start == in.size()) return out;
element = strip_string(element);
if (element.size() > 1 && element.front() == '"' && element.back() == '"')
element = element.substr(1, element.size() - 2);
if (element.empty()) continue;
listen_interface_t iface;
iface.ssl = false;
if (in[start] == '[')
string_view port;
if (element.front() == '[')
{
++start;
// IPv6 address
while (start < in.size() && in[start] != ']')
iface.device += in[start++];
auto const pos = find_first_of(element, ']', 0);
if (pos == string_view::npos
|| pos+1 >= element.size()
|| element[pos+1] != ':')
{
err.emplace_back(element);
continue;
}
// skip to the colon
while (start < in.size() && in[start] != ':')
++start;
iface.device = strip_string(element.substr(1, pos - 1)).to_string();
port = strip_string(element.substr(pos + 2));
}
else
{
// consume device name
while (start < in.size() && !is_space(in[start]) && in[start] != ':')
iface.device += in[start++];
auto const pos = find_first_of(element, ':', 0);
iface.device = strip_string(element.substr(0, pos)).to_string();
if (pos == string_view::npos)
{
err.emplace_back(element);
continue;
}
port = strip_string(element.substr(pos + 1));
}
// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
if (start == in.size() || in[start] != ':') return out;
++start; // skip colon
// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
// consume port
std::string port;
while (start < in.size() && is_digit(in[start]) && in[start] != ',')
port += in[start++];
std::string port_str;
for (std::size_t i = 0; i < port.size() && is_digit(port[i]); ++i)
port_str += port[i];
if (port.empty() || port.size() > 5)
if (port_str.empty() || port_str.size() > 5)
{
iface.port = -1;
}
else
{
iface.port = std::atoi(port.c_str());
if (iface.port < 0 || iface.port > 65535) iface.port = -1;
err.emplace_back(element);
continue;
}
// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
iface.port = std::atoi(port_str.c_str());
if (iface.port < 0 || iface.port > 65535)
{
err.emplace_back(element);
continue;
}
port.remove_prefix(port_str.size());
port = strip_string(port);
// consume potential SSL 's'
if (start < in.size() && in[start] == 's')
for (auto const c : port)
{
iface.ssl = true;
++start;
switch (c)
{
case 's': iface.ssl = true; break;
}
}
// skip until end or comma
while (start < in.size() && in[start] != ',')
++start;
if (iface.port >= 0) out.push_back(iface);
// skip the comma
if (start < in.size() && in[start] == ',')
++start;
TORRENT_ASSERT(iface.port >= 0);
out.emplace_back(iface);
}
return out;

88
test/test_string.cpp
View File

@ -346,19 +346,23 @@ TORRENT_TEST(path)
namespace {
void test_parse_interface(char const* input
, std::vector<listen_interface_t> expected
, std::string output)
, std::vector<listen_interface_t> const expected
, std::vector<std::string> const expected_e
, string_view const output)
{
std::printf("parse interface: %s\n", input);
auto const list = parse_listen_interfaces(input);
std::vector<std::string> err;
auto const list = parse_listen_interfaces(input, err);
TEST_EQUAL(list.size(), expected.size());
if (list.size() == expected.size())
{
TEST_CHECK(std::equal(list.begin(), list.end(), expected.begin()
, [&](listen_interface_t const& lhs, listen_interface_t const& rhs)
{ return lhs.device == rhs.device && lhs.port == rhs.port && lhs.ssl == rhs.ssl; }));
}
TEST_CHECK(list == expected);
TEST_CHECK(err == expected_e);
#if TORRENT_ABI_VERSION == 1 \
|| !defined TORRENT_DISABLE_LOGGING
TEST_EQUAL(print_listen_interfaces(list), output);
std::cout << "RESULT: " << print_listen_interfaces(list) << '\n';
#endif
for (auto const& e : err)
std::cout << "ERR: \"" << e << "\"\n";
}
} // anonymous namespace
@ -367,46 +371,68 @@ TORRENT_TEST(parse_list)
{
std::vector<std::string> list;
parse_comma_separated_string(" a,b, c, d ,e \t,foobar\n\r,[::1]", list);
TEST_EQUAL(list.size(), 7);
TEST_EQUAL(list[0], "a");
TEST_EQUAL(list[1], "b");
TEST_EQUAL(list[2], "c");
TEST_EQUAL(list[3], "d");
TEST_EQUAL(list[4], "e");
TEST_EQUAL(list[5], "foobar");
TEST_EQUAL(list[6], "[::1]");
TEST_CHECK((list == std::vector<std::string>{"a", "b", "c", "d", "e", "foobar", "[::1]"}));
}
TORRENT_TEST(parse_interface)
{
test_parse_interface(" a:4,b:35, c : 1000s, d: 351 ,e \t:42,foobar:1337s\n\r,[2001::1]:6881"
, {{"a", 4, false}, {"b", 35, false}, {"c", 1000, true}, {"d", 351, false}
, {"e", 42, false}, {"foobar", 1337, true}, {"2001::1", 6881, false}}
, {}
, "a:4,b:35,c:1000s,d:351,e:42,foobar:1337s,[2001::1]:6881");
// IPv6 address
test_parse_interface("[2001:ffff::1]:6882s"
, {{"2001:ffff::1", 6882, true}}
, {}
, "[2001:ffff::1]:6882s");
// IPv4 address
test_parse_interface("127.0.0.1:6882"
, {{"127.0.0.1", 6882, false}}
, {}
, "127.0.0.1:6882");
// maximum padding
test_parse_interface(" nic\r\n:\t 12\r s "
, {{"nic", 12, true}}
, {}
, "nic:12s");
// negative tests
test_parse_interface("nic:99999999999999999999999", {}, "");
test_parse_interface("nic: -3", {}, "");
test_parse_interface("nic: ", {}, "");
test_parse_interface("nic :", {}, "");
test_parse_interface("nic ", {}, "");
test_parse_interface("nic s", {}, "");
test_parse_interface("nic:99999999999999999999999", {}, {"nic:99999999999999999999999"}, "");
test_parse_interface("nic: -3", {}, {"nic: -3"}, "");
test_parse_interface("nic: ", {}, {"nic:"}, "");
test_parse_interface("nic :", {}, {"nic :"}, "");
test_parse_interface("nic ", {}, {"nic"}, "");
test_parse_interface("nic s", {}, {"nic s"}, "");
// parse interface with port 0
test_parse_interface("127.0.0.1:0"
, {{"127.0.0.1", 0, false}}, "127.0.0.1:0");
test_parse_interface("127.0.0.1:0", {{"127.0.0.1", 0, false}}, {}, "127.0.0.1:0");
// IPv6 error
test_parse_interface("[aaaa::1", {}, {"[aaaa::1"}, "");
test_parse_interface("[aaaa::1]", {}, {"[aaaa::1]"}, "");
test_parse_interface("[aaaa::1]:", {}, {"[aaaa::1]:"}, "");
test_parse_interface("[aaaa::1]:s", {}, {"[aaaa::1]:s"}, "");
test_parse_interface("[aaaa::1] :6881", {}, {"[aaaa::1] :6881"}, "");
test_parse_interface("[aaaa::1]:6881", {{"aaaa::1", 6881, false}}, {}, "[aaaa::1]:6881");
// unterminated [
test_parse_interface("[aaaa::1,foobar:0", {{"foobar", 0, false}}, {"[aaaa::1"}, "foobar:0");
// multiple errors
test_parse_interface("foo:,bar", {}, {"foo:", "bar"}, "");
// quoted elements
test_parse_interface("\"abc,.\",bar", {}, {"abc,.", "bar"}, "");
// silent error
test_parse_interface("\"", {}, {"\""}, "");
// multiple errors and one correct
test_parse_interface("foo,bar,0.0.0.0:6881", {{"0.0.0.0", 6881, false}}, {"foo", "bar"}, "0.0.0.0:6881");
}
TORRENT_TEST(split_string)
@ -508,3 +534,15 @@ TORRENT_TEST(find_first_of)
TEST_EQUAL(find_first_of(test, "61", 3), 6);
TEST_EQUAL(find_first_of(test, "61", 4), 6);
}
TORRENT_TEST(strip_string)
{
TEST_EQUAL(strip_string(" ab"), "ab");
TEST_EQUAL(strip_string(" ab "), "ab");
TEST_EQUAL(strip_string(" "), "");
TEST_EQUAL(strip_string(""), "");
TEST_EQUAL(strip_string("a b"), "a b");
TEST_EQUAL(strip_string(" a b "), "a b");
TEST_EQUAL(strip_string(" \t \t ab\t\t\t"), "ab");
}