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/***************************************************************************
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fork.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "common.h"
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#include "bbs_main.h"
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#include "bbs.h"
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#include "log.h"
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#include "io.h"
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#include "fork.h"
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#include "menu.h"
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#include "database.h"
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#include "login.h"
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <libssh/libssh.h>
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#include <libssh/server.h>
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#include <libssh/callbacks.h>
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#define SSH_AUTH_MAX_DURATION 60 // seconds
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struct ssl_server_cb_data_t
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{
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int tries;
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int error;
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};
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static int auth_password(ssh_session session, const char *user,
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const char *password, void *userdata)
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{
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MYSQL *db;
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struct ssl_server_cb_data_t *p_data = userdata;
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int ret;
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if ((db = db_open()) == NULL)
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{
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return SSH_AUTH_ERROR;
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}
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if (strcmp(user, "guest") == 0)
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{
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ret = load_guest_info(db);
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}
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else
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{
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ret = check_user(db, user, password);
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}
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mysql_close(db);
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if (ret == 0)
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{
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return SSH_AUTH_SUCCESS;
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}
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if ((++(p_data->tries)) >= BBS_login_retry_times)
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{
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p_data->error = 1;
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}
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return SSH_AUTH_DENIED;
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}
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static int pty_request(ssh_session session, ssh_channel channel, const char *term,
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int x, int y, int px, int py, void *userdata)
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{
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return 0;
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}
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static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
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{
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return 0;
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}
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static struct ssh_channel_callbacks_struct channel_cb = {
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.channel_pty_request_function = pty_request,
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.channel_shell_request_function = shell_request};
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static ssh_channel new_session_channel(ssh_session session, void *userdata)
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{
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if (SSH_channel != NULL)
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{
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return NULL;
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}
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SSH_channel = ssh_channel_new(session);
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ssh_callbacks_init(&channel_cb);
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ssh_set_channel_callbacks(SSH_channel, &channel_cb);
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return SSH_channel;
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}
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int fork_server(void)
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{
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ssh_event event;
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int pid;
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int i;
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int ret;
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struct ssl_server_cb_data_t cb_data = {
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.tries = 0,
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.error = 0,
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};
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struct ssh_server_callbacks_struct cb = {
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.userdata = &cb_data,
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.auth_password_function = auth_password,
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.channel_open_request_session_function = new_session_channel,
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};
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pid = fork();
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if (pid > 0) // Parent process
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{
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SYS_child_process_count++;
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log_common("Child process (%d) start\n", pid);
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return pid;
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}
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else if (pid < 0) // Error
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{
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log_error("fork() error (%d)\n", errno);
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return -1;
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}
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// Child process
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if (close(socket_server[0]) == -1 || close(socket_server[1]) == -1)
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{
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log_error("Close server socket failed\n");
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}
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SSH_session = ssh_new();
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if (SSH_v2)
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{
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if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
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{
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log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
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goto cleanup;
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}
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ssh_bind_free(sshbind);
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ssh_callbacks_init(&cb);
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ssh_set_server_callbacks(SSH_session, &cb);
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if (ssh_handle_key_exchange(SSH_session))
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{
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log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
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goto cleanup;
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}
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ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
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event = ssh_event_new();
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ssh_event_add_session(event, SSH_session);
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for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i++)
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{
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ret = ssh_event_dopoll(event, 1000); // 1 second
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if (ret == SSH_ERROR)
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{
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log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
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goto cleanup;
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}
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}
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if (cb_data.error)
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{
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log_error("SSH auth error, tried %d times\n", cb_data.tries);
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goto cleanup;
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}
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}
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// Redirect Input
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close(STDIN_FILENO);
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if (dup2(socket_client, STDIN_FILENO) == -1)
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{
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log_error("Redirect stdin to client socket failed\n");
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goto cleanup;
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}
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// Redirect Output
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close(STDOUT_FILENO);
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if (dup2(socket_client, STDOUT_FILENO) == -1)
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{
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log_error("Redirect stdout to client socket failed\n");
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goto cleanup;
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}
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SYS_child_process_count = 0;
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bbs_main();
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cleanup:
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// Child process exit
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SYS_server_exit = 1;
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if (SSH_v2)
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{
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ssh_channel_free(SSH_channel);
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ssh_disconnect(SSH_session);
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}
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else if (close(socket_client) == -1)
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{
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log_error("Close client socket failed\n");
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}
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ssh_free(SSH_session);
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ssh_finalize();
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// Close Input and Output for client
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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log_common("Process exit normally\n");
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log_end();
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_exit(0);
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return 0;
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}
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