static int
start_ss_plugin(const char *plugin,
const char *plugin_opts,
const char *remote_host,
const char *remote_port,
const char *local_host,
const char *local_port,
enum plugin_mode mode)
{
cork_env_add(env, "SS_REMOTE_HOST", remote_host);
cork_env_add(env, "SS_REMOTE_PORT", remote_port);
cork_env_add(env, "SS_LOCAL_HOST", local_host);
cork_env_add(env, "SS_LOCAL_PORT", local_port);
if (plugin_opts != NULL)
cork_env_add(env, "SS_PLUGIN_OPTIONS", plugin_opts);
#ifdef __ANDROID__
exec = cork_exec_new_with_params("sh", "-c", plugin, NULL);
#else
exec = cork_exec_new_with_params(plugin, NULL);
#endif
cork_exec_set_env(exec, env);
sub = cork_subprocess_new_exec(exec, NULL, NULL, &exit_code);
#ifdef __MINGW32__
cork_subprocess_set_control(sub, sub_control_port);
#endif
return cork_subprocess_start(sub);
}
/*
* For obfsproxy, we use standalone mode for now.
* Managed mode needs to use SOCKS5 proxy as forwarder, which is not supported
* yet.
*
* The idea of using standalone mode is quite simple, just assemble the
* internal port into obfsproxy parameters.
*
* Using manually ran scramblesuit as an example:
* obfsproxy \
* --data-dir /tmp/ss_libev_plugin_with_suffix \
* scramblesuit \
* --password SOMEMEANINGLESSPASSWORDASEXAMPLE \
* --dest some.server.org:12345 \
* client \
* 127.0.0.1:54321
*
* In above case, @plugin = "obfsproxy",
* @plugin_opts = "scramblesuit --password SOMEMEANINGLESSPASSWORDASEXAMPLE"
* For obfs3, it's even easier, just pass @plugin = "obfsproxy"
* @plugin_opts = "obfs3"
*
* And the rest parameters are all assembled here.
* Some old obfsproxy will not be supported as it doesn't even support
* "--data-dir" option
*/
static int
start_obfsproxy(const char *plugin,
const char *plugin_opts,
const char *remote_host,
const char *remote_port,
const char *local_host,
const char *local_port,
enum plugin_mode mode)
{
char *pch;
char *opts_dump = NULL;
char *buf = NULL;
int ret, buf_size = 0;
if (plugin_opts != NULL) {
opts_dump = strndup(plugin_opts, OBFSPROXY_OPTS_MAX);
if (!opts_dump) {
ERROR("start_obfsproxy strndup failed");
if (env != NULL) {
cork_env_free(env);
}
return -ENOMEM;
}
}
exec = cork_exec_new(plugin);
/* The first parameter will be skipped, so pass @plugin again */
cork_exec_add_param(exec, plugin);
cork_exec_add_param(exec, "--data-dir");
buf_size = 20 + strlen(plugin) + strlen(remote_host)
+ strlen(remote_port) + strlen(local_host) + strlen(local_port);
buf = ss_malloc(buf_size);
snprintf(buf, buf_size, TEMPDIR "%s_%s:%s_%s:%s", plugin,
remote_host, remote_port, local_host, local_port);
cork_exec_add_param(exec, buf);
/*
* Iterate @plugin_opts by space
*/
if (opts_dump != NULL) {
pch = strtok(opts_dump, " ");
while (pch) {
cork_exec_add_param(exec, pch);
pch = strtok(NULL, " ");
}
}
/* The rest options */
if (mode == MODE_CLIENT) {
/* Client mode */
cork_exec_add_param(exec, "--dest");
snprintf(buf, buf_size, "%s:%s", remote_host, remote_port);
cork_exec_add_param(exec, buf);
cork_exec_add_param(exec, "client");
snprintf(buf, buf_size, "%s:%s", local_host, local_port);
cork_exec_add_param(exec, buf);
} else {
/* Server mode */
cork_exec_add_param(exec, "--dest");
snprintf(buf, buf_size, "%s:%s", local_host, local_port);
cork_exec_add_param(exec, buf);
cork_exec_add_param(exec, "server");
snprintf(buf, buf_size, "%s:%s", remote_host, remote_port);
cork_exec_add_param(exec, buf);
}
cork_exec_set_env(exec, env);
sub = cork_subprocess_new_exec(exec, NULL, NULL, &exit_code);
#ifdef __MINGW32__
cork_subprocess_set_control(sub, sub_control_port);
#endif
ret = cork_subprocess_start(sub);
ss_free(opts_dump);
free(buf);
return ret;
}
int
start_plugin(const char *plugin,
const char *plugin_opts,
const char *remote_host,
const char *remote_port,
const char *local_host,
const char *local_port)
{
char *new_path = NULL;
char *cmd = NULL;
if (plugin == NULL)
return -1;
if (strlen(plugin) == 0)
return 0;
size_t plugin_len = strlen(plugin);
size_t cmd_len = plugin_len + CMD_RESRV_LEN;
cmd = ss_malloc(cmd_len);
snprintf(cmd, cmd_len, "exec %s", plugin);
env = cork_env_clone_current();
const char *path = cork_env_get(env, "PATH");
if (path != NULL) {
#ifdef __GLIBC__
char *cwd = get_current_dir_name();
if (cwd) {
#else
char cwd[PATH_MAX];
if (!getcwd(cwd, PATH_MAX)) {
#endif
size_t path_len = strlen(path) + strlen(cwd) + 2;
new_path = ss_malloc(path_len);
snprintf(new_path, path_len, "%s:%s", cwd, path);
#ifdef __GLIBC__
free(cwd);
#endif
}
}
if (new_path != NULL)
cork_env_add(env, "PATH", new_path);
cork_env_add(env, "SS_REMOTE_HOST", remote_host);
cork_env_add(env, "SS_REMOTE_PORT", remote_port);
cork_env_add(env, "SS_LOCAL_HOST", local_host);
cork_env_add(env, "SS_LOCAL_PORT", local_port);
if (plugin_opts != NULL)
cork_env_add(env, "SS_PLUGIN_OPTIONS", plugin_opts);
exec = cork_exec_new_with_params("sh", "-c", cmd, NULL);
cork_exec_set_env(exec, env);
sub = cork_subprocess_new_exec(exec, NULL, NULL, &exit_code);
int err = cork_subprocess_start(sub);
ss_free(cmd);
if (new_path != NULL)
ss_free(new_path);
return err;
}
uint16_t
get_local_port()
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
return 0;
}
struct sockaddr_in serv_addr;
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = 0;
if (bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
return 0;
}
socklen_t len = sizeof(serv_addr);
if (getsockname(sock, (struct sockaddr *)&serv_addr, &len) == -1) {
return 0;
}
if (close (sock) < 0) {
return 0;
}
return ntohs(serv_addr.sin_port);
}
void
stop_plugin()
{
if (sub != NULL) {
cork_subprocess_abort(sub);
cork_subprocess_free(sub);
}
}
int is_plugin_running()
{
if (sub != NULL) {
return cork_subprocess_is_finished(sub);
}
return 0;
}