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/*************************************************************************** |
/*************************************************************************** |
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fork.c - description |
fork.c - description |
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------------------- |
------------------- |
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begin : Mon Oct 18 2004 |
Copyright : (C) 2004-2025 by Leaflet |
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copyright : (C) 2004 by Leaflet |
Email : leaflet@leafok.com |
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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 * |
* 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 * |
* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
* the Free Software Foundation; either version 3 of the License, or * |
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* (at your option) any later version. * |
* (at your option) any later version. * |
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* * |
* * |
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***************************************************************************/ |
***************************************************************************/ |
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#include "common.h" |
#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" |
#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> |
#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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int fork_server() |
#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; |
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 = fork()) |
if (pid > 0) // Parent process |
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{ |
{ |
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SYS_child_process_count++; |
SYS_child_process_count++; |
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log_std("Child process (%d) start\n", pid); |
log_common("Child process (%d) start\n", pid); |
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return 0; |
return pid; |
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} |
} |
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else if (pid < 0) |
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; |
return -1; |
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} |
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if (close(socket_server) == -1) |
// 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"); |
log_error("Close server socket failed\n"); |
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return -2; |
} |
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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 |
// Redirect Input |
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close(0); |
close(STDIN_FILENO); |
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if (dup2(socket_client, 0) == -1) |
if (dup2(socket_client, STDIN_FILENO) == -1) |
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{ |
{ |
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log_error("Redirect stdin to client socket failed\n"); |
log_error("Redirect stdin to client socket failed\n"); |
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return -3; |
goto cleanup; |
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} |
} |
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// Redirect Output |
// Redirect Output |
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close(1); |
close(STDOUT_FILENO); |
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if (dup2(socket_client, 1) == -1) |
if (dup2(socket_client, STDOUT_FILENO) == -1) |
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{ |
{ |
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log_error("Redirect stdout to client socket failed\n"); |
log_error("Redirect stdout to client socket failed\n"); |
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return -4; |
goto cleanup; |
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} |
} |
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SYS_child_process_count = 0; |
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bbs_main(); |
bbs_main(); |
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if (close(socket_client) == -1) |
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"); |
log_error("Close client socket failed\n"); |
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} |
} |
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// Close Input and Output for client |
ssh_free(SSH_session); |
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close(0); |
ssh_finalize(); |
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close(1); |
|
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log_std("Process exit normally\n"); |
// 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(); |
log_end(); |
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// Exit child process normally |
_exit(0); |
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exit(0); |
|
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return 0; |
return 0; |
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} |
} |