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/*
* Copyright 2021 Google LLC
* SPDX-License-Identifier: MIT
*/
#include "proxy_server.h"
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
#include "server/render_protocol.h"
int
proxy_server_connect(struct proxy_server *srv)
{
int client_fd = srv->client_fd;
/* transfer ownership */
srv->client_fd = -1;
return client_fd;
}
void
proxy_server_destroy(struct proxy_server *srv)
{
if (srv->pid >= 0) {
kill(srv->pid, SIGKILL);
siginfo_t siginfo = { 0 };
waitid(P_PID, srv->pid, &siginfo, WEXITED);
}
if (srv->client_fd >= 0)
close(srv->client_fd);
free(srv);
}
static bool
proxy_server_fork(struct proxy_server *srv)
{
int socket_fds[2];
if (!proxy_socket_pair(socket_fds))
return false;
const int client_fd = socket_fds[0];
const int remote_fd = socket_fds[1];
pid_t pid = fork();
if (pid < 0) {
proxy_log("failed to fork proxy server");
close(client_fd);
close(remote_fd);
return false;
}
if (pid > 0) {
srv->pid = pid;
srv->client_fd = client_fd;
close(remote_fd);
} else {
close(client_fd);
/* do not receive signals from terminal */
setpgid(0, 0);
char fd_str[16];
snprintf(fd_str, sizeof(fd_str), "%d", remote_fd);
char *const argv[] = {
RENDER_SERVER_EXEC_PATH,
"--socket-fd",
fd_str,
NULL,
};
execv(argv[0], argv);
proxy_log("failed to exec %s: %s", argv[0], strerror(errno));
close(remote_fd);
exit(-1);
}
return true;
}
static bool
proxy_server_init_fd(struct proxy_server *srv)
{
/* the fd represents a connection to the server */
srv->client_fd = proxy_renderer.cbs->get_server_fd(RENDER_SERVER_VERSION);
if (srv->client_fd < 0)
return false;
return true;
}
struct proxy_server *
proxy_server_create(void)
{
struct proxy_server *srv = calloc(1, sizeof(*srv));
if (!srv)
return NULL;
srv->pid = -1;
if (!proxy_server_init_fd(srv)) {
/* start the render server on demand when the client does not provide a
* server fd
*/
if (!proxy_server_fork(srv)) {
free(srv);
return NULL;
}
}
if (!proxy_socket_is_seqpacket(srv->client_fd)) {
proxy_log("invalid client fd type");
close(srv->client_fd);
free(srv);
return NULL;
}
proxy_log("proxy server with pid %d", srv->pid);
return srv;
}
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