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c69fb4c4d9b61e4326e58cef73c40de693e4eaec
shadowsocks-libev/src/local.cpp
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Max Lv c69fb4c4d9 Seal the heap: bounded library heaps and zero-allocation program tests 
The programs point libuv, c-ares and Mbed TLS (MBEDTLS_PLATFORM_MEMORY in
the bundled build) at their own FixedHeap before anything runs, mark the
end of startup with heap_seal(), and in verbose mode report heap use and
any allocation after it at exit. The library build keeps the host's
allocator.

measure_alloc.py gains --udp, and the alloc_steady_programs_* tests now
fail on any malloc per relayed TCP connection (by name and by address)
or UDP association, for every cipher family.
2026-10-15 00:34:30 +08:00

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/*
* local.cpp - Setup a socks5 proxy through remote shadowsocks server
*
* Copyright (C) 2013 - 2019, Max Lv <max.c.lv@gmail.com>
*
* This file is part of the shadowsocks-libev.
*
* shadowsocks-libev is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* shadowsocks-libev is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with shadowsocks-libev; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <locale.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <getopt.h>
#ifndef __MINGW32__
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#ifdef LIB_ONLY
#include "shadowsocks.h"
#endif
#if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_NET_IF_H) && defined(__linux__)
#include <net/if.h>
#include <sys/ioctl.h>
#define SET_INTERFACE
#endif
#include "core.h"
#include "netutils.h"
#include "resolv.h"
#include "ssurl.h"
#include "utils.h"
#include "socks5.h"
#include "acl.h"
#include "plugin.h"
#include "ss_event.h"
#include "crypto.h"
#include "jconf.h"
#include "common.h"
#include "ss_windows.h"
#include "core/heap_guard.hpp"
#include "relay/tcp.hpp"
#include "relay/udp.hpp"
#undef min
#undef max
#ifndef LIB_ONLY
#ifdef __APPLE__
#include <AvailabilityMacros.h>
#if defined(MAC_OS_X_VERSION_10_10) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_10
#include <launch.h>
#define HAVE_LAUNCHD
#endif
#endif
#endif
#ifndef EAGAIN
#define EAGAIN EWOULDBLOCK
#endif
#ifndef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif
int verbose = 0;
int reuse_port = 0;
int tcp_incoming_sndbuf = 0;
int tcp_incoming_rcvbuf = 0;
int tcp_outgoing_sndbuf = 0;
int tcp_outgoing_rcvbuf = 0;
#ifdef __ANDROID__
int vpn = 0;
uint64_t tx = 0;
uint64_t rx = 0;
ss_tstamp last = 0;
char *stat_path = NULL;
#endif
static int acl = 0;
static int mode = TCP_ONLY;
static int ipv6first = 0;
int fast_open = 0;
static int no_delay = 0;
static int printable_salt = 0;
static int udp_fd = 0;
static int ret_val = 0;
static struct ss_signal sigint_watcher;
static struct ss_signal sigterm_watcher;
#ifndef __MINGW32__
static struct ss_signal sigchld_watcher;
static struct ss_signal sigusr1_watcher;
#else
#ifndef LIB_ONLY
static struct plugin_watcher_t {
ss_io io;
SOCKET fd;
uint16_t port;
int valid;
} plugin_watcher;
#endif
#endif
#ifdef HAVE_SETRLIMIT
#ifndef LIB_ONLY
static int nofile = 0;
#endif
#endif
static void signal_cb(SS_P_ ss_signal *w, int revents);
#if defined(__MINGW32__) && !defined(LIB_ONLY)
static void plugin_watcher_cb(SS_P_ ss_io *w, int revents);
#endif
static int create_and_bind(const char *addr, const char *port);
#ifdef HAVE_LAUNCHD
static int launch_or_create(const char *addr, const char *port);
#endif
#ifndef __MINGW32__
int
setnonblocking(int fd)
{
int flags;
if (-1 == (flags = fcntl(fd, F_GETFL, 0))) {
flags = 0;
}
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
#endif
int
create_and_bind(const char *addr, const char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
int s, listen_sock = -1;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
result = NULL;
s = getaddrinfo(addr, port, &hints, &result);
if (s != 0) {
LOGI("getaddrinfo: %s", gai_strerror(s));
return -1;
}
if (result == NULL) {
LOGE("Could not bind");
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
listen_sock = ss_socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (listen_sock == -1) {
continue;
}
int opt = 1;
ss_setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
ss_setsockopt(listen_sock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
if (reuse_port) {
int err = set_reuseport(listen_sock);
if (err == 0) {
LOGI("tcp port reuse enabled");
}
}
if (tcp_incoming_sndbuf > 0) {
ss_setsockopt(listen_sock, SOL_SOCKET, SO_SNDBUF, &tcp_incoming_sndbuf, sizeof(int));
}
if (tcp_incoming_rcvbuf > 0) {
ss_setsockopt(listen_sock, SOL_SOCKET, SO_RCVBUF, &tcp_incoming_rcvbuf, sizeof(int));
}
s = bind(listen_sock, rp->ai_addr, rp->ai_addrlen);
if (s == 0) {
/* We managed to bind successfully! */
break;
} else {
ERROR("bind");
}
ss_socket_close(listen_sock);
listen_sock = -1;
}
freeaddrinfo(result);
return listen_sock;
}
#ifdef HAVE_LAUNCHD
int
launch_or_create(const char *addr, const char *port)
{
int *fds;
size_t cnt;
int error = launch_activate_socket("Listeners", &fds, &cnt);
if (error == 0) {
if (cnt == 1) {
return fds[0];
} else {
FATAL("please don't specify multi entry");
}
} else if (error == ESRCH || error == ENOENT) {
/* ESRCH: The calling process is not managed by launchd(8).
* ENOENT: The socket name specified does not exist
* in the caller's launchd.plist(5).
*/
if (port == NULL) {
usage();
exit(EXIT_FAILURE);
}
return create_and_bind(addr, port);
} else {
FATAL("launch_activate_socket() error");
}
return -1;
}
#endif
#ifdef __ANDROID__
void
stat_update_cb()
{
ss_tstamp now = ss_time();
if (now - last > 0.5) {
send_traffic_stat(tx, rx);
last = now;
}
}
#endif
// The relays of ss-local on the ss_event loop: TCP (with a resolver for
// host-name ACL rules) and UDP, sharing one cipher configuration.
namespace {
struct Relays {
ss::event::Loop loop;
ss::relay::Method method;
ss::relay::Resolver resolver;
ss::relay::TcpRelay tcp;
ss::relay::UdpRelay udp;
bool resolving = false;
bool tcp_on = false;
bool udp_on = false;
bool init(struct ss_loop *ss_loop, const char *cipher, const char *pass, const char *key)
{
if (!loop.adopt(ss_native_loop(ss_loop))) {
return false;
}
LOGI("initializing ciphers... %s", cipher);
if (!method.init(cipher, pass, key, ss::crypto::Role::client)) {
LOGE("failed to initialize ciphers");
return false;
}
return true;
}
bool start_tcp(ss::relay::TcpConfig &config, int listenfd)
{
if (config.acl) {
config.acl_hooks.match_host = &acl_match_host;
config.acl_hooks.mode = &get_acl_mode;
config.acl_hooks.outbound_blocked = &outbound_block_match_host;
if (!resolver.init(loop, NULL, ipv6first != 0, config.max_connections)) {
return false;
}
resolving = true;
}
if (!tcp.init(loop, method, config, resolving ? &resolver : NULL) || !tcp.listen(listenfd)) {
return false;
}
tcp_on = true;
return true;
}
// Returns the UDP socket, or -1.
int start_udp(const char *host, const char *port, const struct sockaddr_storage *remote, int mtu, int timeout,
const char *iface)
{
ss::relay::UdpConfig config;
config.kind = ss::relay::Kind::local;
config.remote = *remote;
config.timeout_secs = timeout;
config.max_sessions = 256;
config.mtu = mtu;
config.iface = iface;
#ifdef __ANDROID__
config.vpn = vpn != 0;
config.protect = protect_socket;
config.tx = &tx;
config.rx = &rx;
config.on_traffic = &stat_update_cb;
#endif
auto fd = ss::relay::open_udp_listener(host, port, false, reuse_port != 0);
if (!fd || !udp.init(loop, method, config, NULL)) {
return -1;
}
if (!udp.listen(*fd)) {
ss_socket_close(*fd);
return -1;
}
udp_on = true;
return (int)*fd;
}
void stop()
{
if (tcp_on) {
tcp.shutdown();
}
if (udp_on) {
udp.shutdown();
}
static bool resolver_closed;
resolver_closed = !resolving;
if (resolving) {
resolver.shutdown(ss::CloseCompletion([](void *, uint32_t) { resolver_closed = true; }, NULL, 0));
}
while ((tcp_on && !tcp.closed()) || (udp_on && !udp.closed()) || !resolver_closed) {
loop.run_nowait();
}
tcp_on = udp_on = resolving = false;
}
};
void
fill_tcp_config(ss::relay::TcpConfig &config, const struct sockaddr_storage *remotes, int remote_count,
int timeout, int mptcp, char *iface)
{
config.kind = ss::relay::Kind::local;
config.remotes = { remotes, (size_t)remote_count };
config.timeout_secs = timeout;
config.max_connections = DEFAULT_MAX_CONNECTIONS;
config.fast_open = fast_open != 0;
config.no_delay = no_delay != 0;
config.printable_salt = printable_salt != 0;
config.acl = acl != 0;
config.upstream.sndbuf = tcp_outgoing_sndbuf;
config.upstream.rcvbuf = tcp_outgoing_rcvbuf;
config.upstream.mptcp = mptcp;
config.upstream.iface = iface;
#ifdef __ANDROID__
config.vpn = vpn != 0;
config.upstream.protect = protect_socket;
config.tx = &tx;
config.rx = &rx;
config.on_traffic = &stat_update_cb;
#endif
}
} // namespace
static void
signal_cb(SS_P_ ss_signal *w, int revents)
{
if (revents & SS_SIGNAL) {
switch (w->signum) {
#ifndef __MINGW32__
case SIGCHLD:
if (!is_plugin_running()) {
LOGE("plugin service exit unexpectedly");
ret_val = -1;
} else
return;
case SIGUSR1:
#endif
case SIGINT:
case SIGTERM:
ss_signal_stop(SS_DEFAULT, &sigint_watcher);
ss_signal_stop(SS_DEFAULT, &sigterm_watcher);
#ifndef __MINGW32__
ss_signal_stop(SS_DEFAULT, &sigchld_watcher);
ss_signal_stop(SS_DEFAULT, &sigusr1_watcher);
#else
#ifndef LIB_ONLY
ss_io_stop(SS_DEFAULT, &plugin_watcher.io);
#endif
#endif
ss_unloop(SS_A_ SS_UNLOOP_ALL);
}
}
}
#if defined(__MINGW32__) && !defined(LIB_ONLY)
static void
plugin_watcher_cb(SS_P_ ss_io *w, int revents)
{
char buf[1];
SOCKET fd = ss_accept(plugin_watcher.fd, NULL, NULL);
if (fd == INVALID_SOCKET) {
return;
}
recv(fd, buf, 1, 0);
closesocket(fd);
LOGE("plugin service exit unexpectedly");
ret_val = -1;
ss_signal_stop(SS_DEFAULT, &sigint_watcher);
ss_signal_stop(SS_DEFAULT, &sigterm_watcher);
ss_io_stop(SS_DEFAULT, &plugin_watcher.io);
ss_unloop(SS_A_ SS_UNLOOP_ALL);
}
#endif
#ifndef LIB_ONLY
int
main(int argc, char **argv)
{
// Bounded heaps for libuv, c-ares and Mbed TLS before any of them runs.
if (!ss::install_library_heaps())
FATAL("failed to reserve the library heaps");
int i, c;
int pid_flags = 0;
int mtu = 0;
int mptcp = 0;
int timeout_secs = 0;
char *user = NULL;
char *local_port = NULL;
char *local_addr = NULL;
char *password = NULL;
char *key = NULL;
char *timeout = NULL;
char *method = NULL;
char *pid_path = NULL;
char *conf_path = NULL;
char *iface = NULL;
char *plugin = NULL;
char *plugin_opts = NULL;
char *plugin_host = NULL;
char *plugin_port = NULL;
char tmp_port[8];
int remote_num = 0;
ss_addr_t remote_addr[MAX_REMOTE_NUM];
char *remote_port = NULL;
/* Lives until exit; its strings are handed to the config above. */
ss_url_t server_url = { 0 };
memset(remote_addr, 0, sizeof(ss_addr_t) * MAX_REMOTE_NUM);
/* [cli_long_config]
\par `--config <config_file>`
Read JSON configuration. See the CLI conventions for precedence and default-value behavior. Short alias: `-c`.
[cli_long_config] */
/* [cli_long_cipher]
\par `--cipher <encrypt_method>`
Select the encryption cipher. See `-m` for supported cipher names and key requirements. Short alias: `-m`.
[cli_long_cipher] */
/* [cli_long_timeout]
\par `--timeout <timeout>`
Same behavior as `-t`; see that option for details. Short alias: `-t`.
[cli_long_timeout] */
/* [cli_long_user]
\par `--user <user_name>`
Same behavior as `-a`; see that option for details. Short alias: `-a`.
[cli_long_user] */
/* [cli_long_pid_file]
\par `--pid-file <pid_file>`
Same behavior as `-f`; see that option for details. Short alias: `-f`.
[cli_long_pid_file] */
/* [cli_long_nofile]
\par `--nofile <number>`
Same behavior as `-n`; see that option for details. Short alias: `-n`.
[cli_long_nofile] */
/* [cli_long_udp]
\par `--udp`
Enable both TCP and UDP relay, overriding the configured mode. Short alias: `-u`.
[cli_long_udp] */
/* [cli_long_udp_only]
\par `--udp-only`
Enable UDP relay only, overriding the configured mode. Short alias: `-U`.
[cli_long_udp_only] */
/* [cli_long_ipv6_first]
\par `--ipv6-first`
Prefer IPv6 DNS results; overrides configuration. This does not restrict connections to IPv6. Short alias: `-6`.
[cli_long_ipv6_first] */
/* [cli_long_verbose]
\par `--verbose`
Same behavior as `-v`; see that option for details. Short alias: `-v`.
[cli_long_verbose] */
/* [cli_long_server]
\par `--server <HOST:PORT>`
Set a remote server endpoint; may be repeated with different ports. Use `HOST:PORT` for a hostname or IPv4, and `[IPv6]:PORT` for IPv6 (including `%scope` when needed). Bare IPv6 is always a host, never split into a port. Host-only values require the legacy `--server-port` fallback or a configured port. An endpoint port takes priority over the fallback regardless of option order. SIP003 plugins require the same port for all endpoints. Short alias: `-s`.
[cli_long_server] */
/* [cli_long_server_port]
\par `--server-port <server_port>`
Legacy fallback port for server values without an embedded port. Prefer `--server HOST:PORT`. Short alias: `-p`.
[cli_long_server_port] */
/* [cli_long_listen_address]
\par `--listen-address <local_address>`
Set the listening address. Server and manager addresses may be repeated. Short alias: `-b`.
[cli_long_listen_address] */
/* [cli_long_listen_port]
\par `--listen-port <local_port>`
Set the listening port. Short alias: `-l`.
[cli_long_listen_port] */
/* [cli_long_interface]
\par `--interface <interface>`
Same behavior as `-i`; see that option for details. Short alias: `-i`.
[cli_long_interface] */
/* [cli_long_vpn]
\par `--vpn`
Same behavior as `-V`; see that option for details. Short alias: `-V`.
[cli_long_vpn] */
/* [cli_long_stat_path]
\par `--stat-path <path>`
Same behavior as `-S`; see that option for details. Short alias: `-S`.
[cli_long_stat_path] */
/* [cli-options]
\snippet{doc} utils.cpp cli_short_f
\snippet{doc} utils.cpp cli_short_s
\snippet{doc} utils.cpp cli_short_p
\snippet{doc} utils.cpp cli_short_l
\snippet{doc} utils.cpp cli_short_k
\snippet{doc} utils.cpp cli_short_t
\snippet{doc} utils.cpp cli_short_m
\snippet{doc} utils.cpp cli_short_i
\snippet{doc} utils.cpp cli_short_c
\snippet{doc} utils.cpp cli_short_b
\snippet{doc} utils.cpp cli_short_a
\snippet{doc} utils.cpp cli_short_n
\snippet{doc} utils.cpp cli_short_S
\snippet{doc} utils.cpp cli_short_h
\snippet{doc} utils.cpp cli_short_u
\snippet{doc} utils.cpp cli_short_U
\snippet{doc} utils.cpp cli_short_v
\snippet{doc} utils.cpp cli_short_V
\snippet{doc} utils.cpp cli_short_6
\snippet{doc} utils.cpp cli_short_A
\snippet{doc} local.cpp cli_long_config
\snippet{doc} local.cpp cli_long_cipher
\snippet{doc} local.cpp cli_long_timeout
\snippet{doc} local.cpp cli_long_user
\snippet{doc} local.cpp cli_long_pid_file
\snippet{doc} local.cpp cli_long_nofile
\snippet{doc} local.cpp cli_long_udp
\snippet{doc} local.cpp cli_long_udp_only
\snippet{doc} local.cpp cli_long_ipv6_first
\snippet{doc} local.cpp cli_long_verbose
\snippet{doc} local.cpp cli_long_server
\snippet{doc} local.cpp cli_long_server_port
\snippet{doc} local.cpp cli_long_listen_address
\snippet{doc} local.cpp cli_long_listen_port
\snippet{doc} local.cpp cli_long_interface
\snippet{doc} utils.cpp cli_long_version
\snippet{doc} utils.cpp cli_long_tcp_only
\snippet{doc} utils.cpp cli_long_ipv4_first
\snippet{doc} local.cpp cli_long_vpn
\snippet{doc} local.cpp cli_long_stat_path
\snippet{doc} utils.cpp cli_long_reuse_port
\snippet{doc} utils.cpp cli_long_tcp_incoming_sndbuf
\snippet{doc} utils.cpp cli_long_tcp_incoming_rcvbuf
\snippet{doc} utils.cpp cli_long_tcp_outgoing_sndbuf
\snippet{doc} utils.cpp cli_long_tcp_outgoing_rcvbuf
\snippet{doc} utils.cpp cli_long_fast_open
\snippet{doc} utils.cpp cli_long_no_delay
\snippet{doc} utils.cpp cli_long_acl
\snippet{doc} utils.cpp cli_long_mtu
\snippet{doc} utils.cpp cli_long_mptcp
\snippet{doc} utils.cpp cli_long_plugin
\snippet{doc} utils.cpp cli_long_plugin_opts
\snippet{doc} utils.cpp cli_long_password
\snippet{doc} utils.cpp cli_long_key
\snippet{doc} utils.cpp cli_long_server_url
\snippet{doc} utils.cpp cli_long_printable_salt
\snippet{doc} utils.cpp cli_long_help
[cli-options] */
static struct option long_options[] = {
{ "config", required_argument, NULL, 'c' },
{ "cipher", required_argument, NULL, 'm' },
{ "timeout", required_argument, NULL, 't' },
{ "user", required_argument, NULL, 'a' },
{ "pid-file", required_argument, NULL, 'f' },
{ "nofile", required_argument, NULL, 'n' },
{ "udp", no_argument, NULL, 'u' },
{ "udp-only", no_argument, NULL, 'U' },
{ "ipv6-first", no_argument, NULL, '6' },
{ "verbose", no_argument, NULL, 'v' },
{ "server", required_argument, NULL, 's' },
{ "server-port", required_argument, NULL, 'p' },
{ "listen-address", required_argument, NULL, 'b' },
{ "listen-port", required_argument, NULL, 'l' },
{ "interface", required_argument, NULL, 'i' },
{ "version", no_argument, NULL, GETOPT_VAL_VERSION },
{ "tcp-only", no_argument, NULL, GETOPT_VAL_TCP_ONLY },
{ "ipv4-first", no_argument, NULL, GETOPT_VAL_IPV4_FIRST },
#ifdef __ANDROID__
{ "vpn", no_argument, NULL, 'V' },
{ "stat-path", required_argument, NULL, 'S' },
#endif
{ "reuse-port", no_argument, NULL, GETOPT_VAL_REUSE_PORT },
{ "tcp-incoming-sndbuf", required_argument, NULL, GETOPT_VAL_TCP_INCOMING_SNDBUF },
{ "tcp-incoming-rcvbuf", required_argument, NULL, GETOPT_VAL_TCP_INCOMING_RCVBUF },
{ "tcp-outgoing-sndbuf", required_argument, NULL, GETOPT_VAL_TCP_OUTGOING_SNDBUF },
{ "tcp-outgoing-rcvbuf", required_argument, NULL, GETOPT_VAL_TCP_OUTGOING_RCVBUF },
{ "fast-open", no_argument, NULL, GETOPT_VAL_FAST_OPEN },
{ "printable-salt", no_argument, NULL, GETOPT_VAL_PRINTABLE_SALT },
{ "no-delay", no_argument, NULL, GETOPT_VAL_NODELAY },
{ "acl", required_argument, NULL, GETOPT_VAL_ACL },
{ "mtu", required_argument, NULL, GETOPT_VAL_MTU },
{ "mptcp", no_argument, NULL, GETOPT_VAL_MPTCP },
{ "plugin", required_argument, NULL, GETOPT_VAL_PLUGIN },
{ "plugin-opts", required_argument, NULL, GETOPT_VAL_PLUGIN_OPTS },
{ "password", required_argument, NULL, GETOPT_VAL_PASSWORD },
{ "key", required_argument, NULL, GETOPT_VAL_KEY },
{ "server-url", required_argument, NULL, GETOPT_VAL_SERVER_URL },
{ "help", no_argument, NULL, GETOPT_VAL_HELP },
{ NULL, 0, NULL, 0 }
};
int mode_set = 0;
int ipv6first_set = 0;
opterr = 0;
USE_TTY();
#ifdef __ANDROID__
while ((c = getopt_long(argc, argv, ":f:s:p:l:k:t:m:i:c:b:a:n:S:huUvV6A",
long_options, NULL)) != -1) {
#else
while ((c = getopt_long(argc, argv, ":f:s:p:l:k:t:m:i:c:b:a:n:huUv6A",
long_options, NULL)) != -1) {
#endif
switch (c) {
case GETOPT_VAL_VERSION:
cli_version();
exit(EXIT_SUCCESS);
case GETOPT_VAL_TCP_ONLY:
mode = TCP_ONLY;
mode_set = 1;
break;
case GETOPT_VAL_IPV4_FIRST:
ipv6first = 0;
ipv6first_set = 1;
break;
case GETOPT_VAL_FAST_OPEN:
fast_open = 1;
break;
case GETOPT_VAL_ACL:
LOGI("initializing acl...");
acl = !init_acl(optarg);
break;
case GETOPT_VAL_MTU:
if (ss_parse_int(optarg, 0, INT_MAX, &mtu) == -1) {
cli_error("invalid MTU", c, NULL);
}
LOGI("set MTU to %d", mtu);
break;
case GETOPT_VAL_MPTCP:
mptcp = get_mptcp(1);
if (mptcp)
LOGI("enable multipath TCP (%s)", mptcp > 0 ? "out-of-tree" : "upstream");
break;
case GETOPT_VAL_PRINTABLE_SALT:
printable_salt = 1;
break;
case GETOPT_VAL_NODELAY:
no_delay = 1;
LOGI("enable TCP no-delay");
break;
case GETOPT_VAL_PLUGIN:
plugin = optarg;
break;
case GETOPT_VAL_PLUGIN_OPTS:
plugin_opts = optarg;
break;
case GETOPT_VAL_KEY:
key = optarg;
break;
case GETOPT_VAL_SERVER_URL:
/*
* An ss:// URI carries the server, credentials and plugin in one
* argument. Options given later on the command line still win,
* since they are applied as getopt reaches them.
*/
if (ss_url_parse(optarg, &server_url) != 0) {
cli_error("invalid ss:// server URL", c, NULL);
}
if (remote_num < MAX_REMOTE_NUM) {
remote_addr[remote_num].host = server_url.host;
remote_addr[remote_num].port = NULL;
remote_num++;
}
remote_port = server_url.port;
method = server_url.method;
password = server_url.password;
if (server_url.plugin != NULL)
plugin = server_url.plugin;
if (server_url.plugin_opts != NULL)
plugin_opts = server_url.plugin_opts;
if (server_url.tag != NULL)
LOGI("using server \"%s\"", server_url.tag);
break;
case GETOPT_VAL_REUSE_PORT:
reuse_port = 1;
break;
case GETOPT_VAL_TCP_INCOMING_SNDBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_incoming_sndbuf) == -1) {
cli_error("invalid TCP incoming send buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_INCOMING_RCVBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_incoming_rcvbuf) == -1) {
cli_error("invalid TCP incoming receive buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_OUTGOING_SNDBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_outgoing_sndbuf) == -1) {
cli_error("invalid TCP outgoing send buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_OUTGOING_RCVBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_outgoing_rcvbuf) == -1) {
cli_error("invalid TCP outgoing receive buffer size", c, NULL);
}
break;
case 's':
if (remote_num < MAX_REMOTE_NUM) {
if (parse_server_endpoint(optarg, &remote_addr[remote_num]) != 0)
cli_error("invalid server endpoint; use HOST:PORT or [IPv6]:PORT", 's', NULL);
remote_num++;
} else {
cli_error("too many server endpoints", 's', NULL);
}
break;
case 'p':
{
uint16_t checked_port;
if (ss_parse_uint16_port(optarg, &checked_port) != 0)
cli_error("port must be an integer from 1 to 65535", c, NULL);
}
remote_port = optarg;
break;
case 'l':
{
uint16_t checked_port;
if (ss_parse_uint16_port(optarg, &checked_port) != 0)
cli_error("port must be an integer from 1 to 65535", c, NULL);
}
local_port = optarg;
break;
case GETOPT_VAL_PASSWORD:
case 'k':
password = optarg;
break;
case 'f':
pid_flags = 1;
pid_path = optarg;
break;
case 't':
{
int checked_timeout;
if (ss_parse_int(optarg, 1, INT_MAX, &checked_timeout) != 0)
cli_error("timeout must be a positive integer", c, NULL);
}
timeout = optarg;
break;
case 'm':
method = optarg;
break;
case 'c':
conf_path = optarg;
break;
case 'i':
iface = optarg;
break;
case 'b':
local_addr = optarg;
break;
case 'a':
user = optarg;
break;
#ifdef HAVE_SETRLIMIT
case 'n':
if (ss_parse_int(optarg, 0, INT_MAX, &nofile) == -1) {
cli_error("invalid nofile", c, NULL);
}
break;
#endif
case 'u':
mode_set = 1;
mode = TCP_AND_UDP;
break;
case 'U':
mode_set = 1;
mode = UDP_ONLY;
break;
case 'v':
verbose = 1;
break;
case 'h':
case GETOPT_VAL_HELP:
usage();
exit(EXIT_SUCCESS);
case '6':
ipv6first_set = 1;
ipv6first = 1;
break;
#ifdef __ANDROID__
case 'S':
stat_path = optarg;
break;
case 'V':
vpn = 1;
break;
#endif
case 'A':
cli_error("one-time authentication was removed; use an AEAD cipher", 'A', NULL);
break;
case ':':
cli_error("missing required argument for option", optopt, argv[optind - 1]);
break;
case '?':
cli_error("unrecognized or invalid option", optopt, argv[optind - 1]);
break;
default:
cli_error("option is unsupported on this platform", c, NULL);
break;
}
}
if (optind < argc) {
cli_error("unexpected positional argument", 0, NULL);
}
if (argc == 1) {
if (conf_path == NULL) {
conf_path = get_default_conf();
}
}
if (conf_path != NULL) {
jconf_t *conf = read_jconf(conf_path);
if (remote_num == 0) {
remote_num = conf->remote_num;
for (i = 0; i < remote_num; i++)
remote_addr[i] = conf->remote_addr[i];
}
if (remote_port == NULL) {
remote_port = conf->remote_port;
}
if (local_addr == NULL) {
local_addr = conf->local_addr;
}
if (local_port == NULL) {
local_port = conf->local_port;
}
if (password == NULL) {
password = conf->password;
}
if (key == NULL) {
key = conf->key;
}
if (method == NULL) {
method = conf->method;
}
if (timeout == NULL) {
timeout = conf->timeout;
}
if (user == NULL) {
user = conf->user;
}
if (plugin == NULL) {
plugin = conf->plugin;
}
if (plugin_opts == NULL) {
plugin_opts = conf->plugin_opts;
}
if (reuse_port == 0) {
reuse_port = conf->reuse_port;
}
if (tcp_incoming_sndbuf == 0) {
tcp_incoming_sndbuf = conf->tcp_incoming_sndbuf;
}
if (tcp_incoming_rcvbuf == 0) {
tcp_incoming_rcvbuf = conf->tcp_incoming_rcvbuf;
}
if (tcp_outgoing_sndbuf == 0) {
tcp_outgoing_sndbuf = conf->tcp_outgoing_sndbuf;
}
if (tcp_outgoing_rcvbuf == 0) {
tcp_outgoing_rcvbuf = conf->tcp_outgoing_rcvbuf;
}
if (fast_open == 0) {
fast_open = conf->fast_open;
}
if (!mode_set) {
mode = conf->mode;
}
if (mtu == 0) {
mtu = conf->mtu;
}
if (mptcp == 0) {
mptcp = conf->mptcp;
}
if (no_delay == 0) {
no_delay = conf->no_delay;
}
if (printable_salt == 0) {
printable_salt = conf->printable_salt;
}
#ifdef HAVE_SETRLIMIT
if (nofile == 0) {
nofile = conf->nofile;
}
#endif
if (!ipv6first_set) {
ipv6first = conf->ipv6_first;
}
if (acl == 0 && conf->acl != NULL) {
LOGI("initializing acl...");
acl = !init_acl(conf->acl);
}
}
if (complete_server_ports(remote_addr, remote_num, remote_port, plugin != NULL) != 0)
cli_error("each server needs a port (1 to 65535); plugins require a shared port", 's', NULL);
remote_port = remote_addr[0].port;
if (remote_num == 0) {
fprintf(stderr, "remote_num is 0\n");
exit(EXIT_FAILURE);
}
if (!remote_port) {
fprintf(stderr, "remote_port is NULL\n");
exit(EXIT_FAILURE);
}
#ifndef HAVE_LAUNCHD
if (!local_port) {
fprintf(stderr, "local_port is NULL\n");
exit(EXIT_FAILURE);
}
#endif
if (!password && !key) {
fprintf(stderr, "both password and key are NULL\n");
exit(EXIT_FAILURE);
}
#ifdef __MINGW32__
winsock_init();
#endif
if (tcp_incoming_sndbuf != 0 && tcp_incoming_sndbuf < SOCKET_BUF_SIZE) {
tcp_incoming_sndbuf = 0;
}
if (tcp_incoming_sndbuf != 0) {
LOGI("set TCP incoming connection send buffer size to %d", tcp_incoming_sndbuf);
}
if (tcp_incoming_rcvbuf != 0 && tcp_incoming_rcvbuf < SOCKET_BUF_SIZE) {
tcp_incoming_rcvbuf = 0;
}
if (tcp_incoming_rcvbuf != 0) {
LOGI("set TCP incoming connection receive buffer size to %d", tcp_incoming_rcvbuf);
}
if (tcp_outgoing_sndbuf != 0 && tcp_outgoing_sndbuf < SOCKET_BUF_SIZE) {
tcp_outgoing_sndbuf = 0;
}
if (tcp_outgoing_sndbuf != 0) {
LOGI("set TCP outgoing connection send buffer size to %d", tcp_outgoing_sndbuf);
}
if (tcp_outgoing_rcvbuf != 0 && tcp_outgoing_rcvbuf < SOCKET_BUF_SIZE) {
tcp_outgoing_rcvbuf = 0;
}
if (tcp_outgoing_rcvbuf != 0) {
LOGI("set TCP outgoing connection receive buffer size to %d", tcp_outgoing_rcvbuf);
}
if (plugin != NULL) {
uint16_t port = get_local_port();
if (port == 0) {
FATAL("failed to find a free port");
}
snprintf(tmp_port, 8, "%d", port);
if (is_ipv6only(remote_addr, remote_num, ipv6first)) {
plugin_host = (char *)"::1";
} else {
plugin_host = (char *)"127.0.0.1";
}
plugin_port = tmp_port;
#ifdef __MINGW32__
memset(&plugin_watcher, 0, sizeof(plugin_watcher));
plugin_watcher.port = get_local_port();
if (plugin_watcher.port == 0) {
LOGE("failed to assign a control port for plugin");
}
#endif
LOGI("plugin \"%s\" enabled", plugin);
}
if (method == NULL) {
method = (char *)"chacha20-ietf-poly1305";
}
if (printable_salt && strcmp(method, "chacha20-ietf-poly1305") != 0
&& strcmp(method, "aes-256-gcm") != 0) {
FATAL("--printable-salt (printable_salt) requires chacha20-ietf-poly1305 or aes-256-gcm");
}
if (printable_salt) {
LOGI("enable experimental printable TCP salt");
}
if (timeout == NULL) {
timeout = (char *)"60";
}
if (ss_parse_int(timeout, 1, INT_MAX, &timeout_secs) == -1) {
FATAL("invalid timeout");
}
#ifdef HAVE_SETRLIMIT
/*
* no need to check the return value here since we will show
* the user an error message if setrlimit(2) fails
*/
if (nofile > 1024) {
if (verbose) {
LOGI("setting NOFILE to %d", nofile);
}
set_nofile(nofile);
}
#endif
if (local_addr == NULL) {
if (is_ipv6only(remote_addr, remote_num, ipv6first)) {
local_addr = (char *)"::1";
} else {
local_addr = (char *)"127.0.0.1";
}
}
USE_SYSLOG(argv[0], pid_flags);
if (pid_flags) {
daemonize(pid_path);
}
if (fast_open == 1) {
#ifdef TCP_FASTOPEN
LOGI("using tcp fast open");
#else
LOGE("tcp fast open is not supported by this environment");
fast_open = 0;
#endif
}
if (no_delay) {
LOGI("enable TCP no-delay");
}
if (ipv6first) {
LOGI("resolving hostname to IPv6 address first");
}
#ifdef __MINGW32__
// Listen on plugin control port
if (plugin != NULL && plugin_watcher.port != 0) {
SOCKET fd;
fd = ss_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd != INVALID_SOCKET) {
plugin_watcher.valid = 0;
do {
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(plugin_watcher.port);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr))) {
LOGE("failed to bind plugin control port");
break;
}
if (listen(fd, 1)) {
LOGE("failed to listen on plugin control port");
break;
}
plugin_watcher.fd = fd;
ss_io_init(&plugin_watcher.io, plugin_watcher_cb, fd, SS_READ);
ss_io_start(SS_DEFAULT, &plugin_watcher.io);
plugin_watcher.valid = 1;
} while (0);
if (!plugin_watcher.valid) {
closesocket(fd);
plugin_watcher.port = 0;
}
}
}
#endif
if (plugin != NULL) {
int len = 0;
size_t buf_size = 256 * remote_num;
char *remote_str = (char *)ss_malloc(buf_size);
snprintf(remote_str, buf_size, "%s", remote_addr[0].host);
len = strlen(remote_str);
for (int i = 1; i < remote_num; i++) {
snprintf(remote_str + len, buf_size - len, "|%s", remote_addr[i].host);
len = strlen(remote_str);
}
int err = start_plugin(plugin, plugin_opts, remote_str,
remote_port, plugin_host, plugin_port,
#ifdef __MINGW32__
plugin_watcher.port,
#endif
MODE_CLIENT);
if (err) {
ERROR("start_plugin");
FATAL("failed to start the plugin");
}
}
#ifndef __MINGW32__
// ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
signal(SIGABRT, SIG_IGN);
#endif
// Setup keys
Relays relays;
if (!relays.init(SS_DEFAULT, method, password, key))
FATAL("failed to initialize ciphers");
// Setup proxy context
struct sockaddr_storage remote_storage[MAX_REMOTE_NUM];
int remote_count = 0;
memset(remote_storage, 0, sizeof(remote_storage));
for (i = 0; i < remote_num; i++) {
char *host = remote_addr[i].host;
char *port = remote_addr[i].port == NULL ? remote_port :
remote_addr[i].port;
if (plugin != NULL) {
host = plugin_host;
port = plugin_port;
}
if (get_sockaddr(host, port, &remote_storage[i], 1, ipv6first) == -1) {
FATAL("failed to resolve the provided hostname");
}
++remote_count;
if (plugin != NULL)
break;
}
ss::relay::TcpConfig tcp_config;
fill_tcp_config(tcp_config, remote_storage, remote_count, timeout_secs, mptcp, iface);
// Setup signal handler
ss_signal_init(&sigint_watcher, signal_cb, SIGINT);
ss_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
ss_signal_start(SS_DEFAULT, &sigint_watcher);
ss_signal_start(SS_DEFAULT, &sigterm_watcher);
#ifndef __MINGW32__
ss_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
ss_signal_start(SS_DEFAULT, &sigchld_watcher);
#endif
if (ss_is_ipv6addr(local_addr))
LOGI("listening at [%s]:%s", local_addr, local_port);
else
LOGI("listening at %s:%s", local_addr, local_port);
struct ss_loop *loop = SS_DEFAULT;
if (mode != UDP_ONLY) {
// Setup socket
int listenfd;
#ifdef HAVE_LAUNCHD
listenfd = launch_or_create(local_addr, local_port);
#else
listenfd = create_and_bind(local_addr, local_port);
#endif
if (listenfd == -1) {
FATAL("bind() error");
}
if (listen(listenfd, SOMAXCONN) == -1) {
FATAL("listen() error");
}
if (!relays.start_tcp(tcp_config, listenfd)) {
FATAL("failed to set up the TCP relay");
}
}
// Setup UDP
if (mode != TCP_ONLY) {
LOGI("udprelay enabled");
char *host = remote_addr[0].host;
char *port = remote_addr[0].port == NULL ? remote_port : remote_addr[0].port;
struct sockaddr_storage udp_remote;
memset(&udp_remote, 0, sizeof(udp_remote));
if (get_sockaddr(host, port, &udp_remote, 1, ipv6first) == -1) {
FATAL("failed to resolve the provided hostname");
}
udp_fd = relays.start_udp(local_addr, local_port, &udp_remote, mtu, timeout_secs, iface);
if (udp_fd == -1) {
FATAL("failed to initialize UDP relay");
}
}
#ifdef HAVE_LAUNCHD
if (local_port == NULL)
LOGI("listening through launchd");
else
#endif
#ifndef __MINGW32__
// setuid
if (user != NULL && !run_as(user)) {
FATAL("failed to switch user");
}
if (geteuid() == 0) {
LOGI("running from root user");
}
#endif
// Enter the loop
ss::heap_seal();
ss_run(loop, 0);
if (verbose) {
LOGI("closed gracefully");
}
// Clean up
if (plugin != NULL) {
stop_plugin();
}
relays.stop();
ss_loop_destroy(loop);
#ifdef __MINGW32__
if (plugin_watcher.valid) {
closesocket(plugin_watcher.fd);
}
winsock_cleanup();
#endif
if (verbose)
ss::log_heap_report();
return ret_val;
}
#else
int
_start_ss_local_server(profile_t profile, ss_local_callback callback, void *udata)
{
char *remote_host = profile.remote_host;
char *local_addr = profile.local_addr;
char *method = profile.method;
char *password = profile.password;
char *log = profile.log;
int remote_port = profile.remote_port;
int local_port = profile.local_port;
int timeout = profile.timeout;
int mtu = 0;
int mptcp = 0;
mode = profile.mode;
fast_open = profile.fast_open;
verbose = profile.verbose;
mtu = profile.mtu;
mptcp = profile.mptcp;
char local_port_str[16];
char remote_port_str[16];
snprintf(local_port_str, sizeof(local_port_str), "%d", local_port);
snprintf(remote_port_str, sizeof(remote_port_str), "%d", remote_port);
#ifdef __MINGW32__
winsock_init();
#endif
USE_LOGFILE(log);
if (profile.acl != NULL) {
LOGI("initializing acl...");
acl = !init_acl(profile.acl);
}
if (local_addr == NULL) {
local_addr = (char *)"127.0.0.1";
}
#ifndef __MINGW32__
// ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
signal(SIGABRT, SIG_IGN);
#endif
ss_signal_init(&sigint_watcher, signal_cb, SIGINT);
ss_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
ss_signal_start(SS_DEFAULT, &sigint_watcher);
ss_signal_start(SS_DEFAULT, &sigterm_watcher);
#ifndef __MINGW32__
ss_signal_init(&sigusr1_watcher, signal_cb, SIGUSR1);
ss_signal_start(SS_DEFAULT, &sigusr1_watcher);
#endif
// Setup keys
Relays relays;
if (!relays.init(SS_DEFAULT, method, password, NULL))
FATAL("failed to init ciphers");
struct sockaddr_storage storage;
memset(&storage, 0, sizeof(struct sockaddr_storage));
if (get_sockaddr(remote_host, remote_port_str, &storage, 1, ipv6first) == -1) {
return -1;
}
// Setup proxy context
struct ss_loop *loop = SS_DEFAULT;
ss::relay::TcpConfig tcp_config;
fill_tcp_config(tcp_config, &storage, 1, timeout, mptcp, NULL);
int listen_fd = -1; // stays -1 in UDP_ONLY mode but is still passed to the callback below
if (ss_is_ipv6addr(local_addr))
LOGI("listening at [%s]:%s", local_addr, local_port_str);
else
LOGI("listening at %s:%s", local_addr, local_port_str);
if (mode != UDP_ONLY) {
// Setup socket
int listenfd;
listenfd = create_and_bind(local_addr, local_port_str);
if (listenfd == -1) {
ERROR("bind()");
return -1;
}
if (listen(listenfd, SOMAXCONN) == -1) {
ERROR("listen()");
return -1;
}
if (!relays.start_tcp(tcp_config, listenfd)) {
LOGE("failed to set up the TCP relay");
return -1;
}
listen_fd = listenfd;
}
// Setup UDP
if (mode != TCP_ONLY) {
LOGI("udprelay enabled");
udp_fd = relays.start_udp(local_addr, local_port_str, &storage, mtu, timeout, NULL);
if (udp_fd == -1) {
return -1;
}
}
if (callback) {
callback(listen_fd, udp_fd, udata);
}
// Enter the loop
ss_run(loop, 0);
if (verbose) {
LOGI("closed gracefully");
}
// Clean up
relays.stop();
ss_loop_destroy(loop);
#ifdef __MINGW32__
winsock_cleanup();
#endif
return ret_val;
}
int
start_ss_local_server(profile_t profile)
{
return _start_ss_local_server(profile, NULL, NULL);
}
int
start_ss_local_server_with_callback(profile_t profile, ss_local_callback callback, void *udata)
{
return _start_ss_local_server(profile, callback, udata);
}
#endif
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