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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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| 3 |
* net_server
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* - network server with SSH support
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*
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| 6 |
* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
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*/
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#include "bbs.h"
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| 10 |
#include "bbs_main.h"
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| 11 |
#include "common.h"
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#include "database.h"
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| 13 |
#include "file_loader.h"
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| 14 |
#include "io.h"
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#include "init.h"
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#include "log.h"
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#include "login.h"
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#include "menu.h"
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#include "net_server.h"
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#include "section_list.h"
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| 21 |
#include "section_list_loader.h"
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| 22 |
#include <errno.h>
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| 23 |
#include <fcntl.h>
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| 24 |
#include <pty.h>
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#include <signal.h>
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#include <stdlib.h>
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| 27 |
#include <string.h>
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| 28 |
#include <unistd.h>
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| 29 |
#include <utmp.h>
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| 30 |
#include <arpa/inet.h>
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| 31 |
#include <libssh/callbacks.h>
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| 32 |
#include <libssh/libssh.h>
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| 33 |
#include <libssh/server.h>
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| 34 |
#include <netinet/in.h>
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| 35 |
#include <sys/epoll.h>
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#include <sys/socket.h>
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| 37 |
#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <systemd/sd-daemon.h>
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| 41 |
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| 42 |
enum _net_server_constant_t
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| 43 |
{
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| 44 |
WAIT_CHILD_PROCESS_EXIT_TIMEOUT = 5, // second
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| 45 |
WAIT_CHILD_PROCESS_KILL_TIMEOUT = 1, // second
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| 46 |
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| 47 |
SSH_AUTH_MAX_DURATION = 60 * 1000, // milliseconds
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| 48 |
};
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| 49 |
|
| 50 |
struct process_sockaddr_t
|
| 51 |
{
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pid_t pid;
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in_addr_t s_addr;
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| 54 |
};
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typedef struct process_sockaddr_t PROCESS_SOCKADDR;
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| 56 |
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| 57 |
static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
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| 58 |
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| 59 |
static const char SFTP_SERVER_PATH[] = "/usr/lib/sftp-server";
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| 60 |
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| 61 |
/* A userdata struct for session. */
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| 62 |
struct session_data_struct
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| 63 |
{
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| 64 |
int tries;
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| 65 |
int error;
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| 66 |
};
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| 67 |
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| 68 |
/* A userdata struct for channel. */
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struct channel_data_struct
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| 70 |
{
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| 71 |
/* pid of the child process the channel will spawn. */
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pid_t pid;
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/* For PTY allocation */
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socket_t pty_master;
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| 75 |
socket_t pty_slave;
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/* For communication with the child process. */
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socket_t child_stdin;
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socket_t child_stdout;
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/* Only used for subsystem and exec requests. */
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socket_t child_stderr;
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| 81 |
/* Event which is used to poll the above descriptors. */
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ssh_event event;
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| 83 |
/* Terminal size struct. */
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| 84 |
struct winsize *winsize;
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| 85 |
};
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| 86 |
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| 87 |
static int auth_password(ssh_session session, const char *user,
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| 88 |
const char *password, void *userdata)
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| 89 |
{
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| 90 |
struct session_data_struct *sdata = (struct session_data_struct *)userdata;
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| 91 |
int ret;
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| 92 |
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| 93 |
if (strcmp(user, "guest") == 0)
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| 94 |
{
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| 95 |
ret = load_guest_info();
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| 96 |
}
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| 97 |
else
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{
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| 99 |
ret = check_user(user, password);
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| 100 |
}
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| 102 |
if (ret == 0)
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| 103 |
{
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return SSH_AUTH_SUCCESS;
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}
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| 106 |
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| 107 |
if ((++(sdata->tries)) >= BBS_login_retry_times)
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{
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sdata->error = 1;
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}
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return SSH_AUTH_DENIED;
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}
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| 114 |
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| 115 |
static int pty_request(ssh_session session, ssh_channel channel, const char *term,
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| 116 |
int cols, int rows, int px, int py, void *userdata)
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| 117 |
{
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| 118 |
struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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int rc;
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(void)session;
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(void)channel;
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(void)term;
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| 125 |
cdata->winsize->ws_row = (unsigned short int)rows;
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| 126 |
cdata->winsize->ws_col = (unsigned short int)cols;
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| 127 |
cdata->winsize->ws_xpixel = (unsigned short int)px;
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| 128 |
cdata->winsize->ws_ypixel = (unsigned short int)py;
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| 129 |
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rc = openpty(&cdata->pty_master, &cdata->pty_slave, NULL, NULL, cdata->winsize);
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| 131 |
if (rc != 0)
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{
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log_error("Failed to open pty\n");
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return SSH_ERROR;
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}
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return SSH_OK;
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}
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static int pty_resize(ssh_session session, ssh_channel channel, int cols, int rows,
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| 141 |
int py, int px, void *userdata)
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{
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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(void)session;
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(void)channel;
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| 148 |
cdata->winsize->ws_row = (unsigned short int)rows;
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cdata->winsize->ws_col = (unsigned short int)cols;
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cdata->winsize->ws_xpixel = (unsigned short int)px;
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cdata->winsize->ws_ypixel = (unsigned short int)py;
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if (cdata->pty_master != -1)
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{
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return ioctl(cdata->pty_master, TIOCSWINSZ, cdata->winsize);
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}
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return SSH_ERROR;
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}
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static int exec_pty(const char *mode, const char *command, struct channel_data_struct *cdata)
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{
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(void)cdata;
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if (command != NULL)
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{
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log_error("Forbid exec /bin/sh %s %s)\n", mode, command);
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}
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return SSH_OK;
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}
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static int exec_nopty(const char *command, struct channel_data_struct *cdata)
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{
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(void)cdata;
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if (command != NULL)
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{
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log_error("Forbid exec /bin/sh -c %s)\n", command);
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}
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return SSH_OK;
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}
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static int exec_request(ssh_session session, ssh_channel channel, const char *command, void *userdata)
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{
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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(void)session;
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(void)channel;
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| 192 |
if (cdata->pid > 0)
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{
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| 194 |
return SSH_ERROR;
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}
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| 197 |
if (cdata->pty_master != -1 && cdata->pty_slave != -1)
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{
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| 199 |
return exec_pty("-c", command, cdata);
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}
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return exec_nopty(command, cdata);
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}
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| 203 |
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| 204 |
static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
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{
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| 206 |
struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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| 208 |
(void)session;
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(void)channel;
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| 211 |
if (cdata->pid > 0)
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{
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return SSH_ERROR;
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}
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if (cdata->pty_master != -1 && cdata->pty_slave != -1)
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{
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return exec_pty("-l", NULL, cdata);
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}
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/* Client requested a shell without a pty, let's pretend we allow that */
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return SSH_OK;
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}
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static int subsystem_request(ssh_session session, ssh_channel channel, const char *subsystem, void *userdata)
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{
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(void)session;
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(void)channel;
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log_error("subsystem_request(subsystem=%s)\n", subsystem);
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/* subsystem requests behave similarly to exec requests. */
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if (strcmp(subsystem, "sftp") == 0)
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{
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return exec_request(session, channel, SFTP_SERVER_PATH, userdata);
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}
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return SSH_ERROR;
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}
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static ssh_channel channel_open(ssh_session session, void *userdata)
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{
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(void)userdata;
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| 243 |
if (SSH_channel != NULL)
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| 244 |
{
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return NULL;
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}
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| 247 |
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| 248 |
SSH_channel = ssh_channel_new(session);
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| 250 |
return SSH_channel;
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}
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| 252 |
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| 253 |
static int fork_server(void)
|
| 254 |
{
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| 255 |
ssh_event event;
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| 256 |
long int ssh_timeout = 0;
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| 257 |
int pid;
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| 258 |
int i;
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| 259 |
int ret;
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| 260 |
|
| 261 |
/* Structure for storing the pty size. */
|
| 262 |
struct winsize wsize = {
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| 263 |
.ws_row = 0,
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| 264 |
.ws_col = 0,
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| 265 |
.ws_xpixel = 0,
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| 266 |
.ws_ypixel = 0};
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| 267 |
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| 268 |
/* Our struct holding information about the channel. */
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| 269 |
struct channel_data_struct cdata = {
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| 270 |
.pid = 0,
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| 271 |
.pty_master = -1,
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| 272 |
.pty_slave = -1,
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| 273 |
.child_stdin = -1,
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| 274 |
.child_stdout = -1,
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| 275 |
.child_stderr = -1,
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| 276 |
.event = NULL,
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| 277 |
.winsize = &wsize};
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| 278 |
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| 279 |
struct session_data_struct cb_data = {
|
| 280 |
.tries = 0,
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| 281 |
.error = 0,
|
| 282 |
};
|
| 283 |
|
| 284 |
struct ssh_channel_callbacks_struct channel_cb = {
|
| 285 |
.userdata = &cdata,
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| 286 |
.channel_pty_request_function = pty_request,
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| 287 |
.channel_pty_window_change_function = pty_resize,
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| 288 |
.channel_shell_request_function = shell_request,
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| 289 |
.channel_exec_request_function = exec_request,
|
| 290 |
.channel_subsystem_request_function = subsystem_request};
|
| 291 |
|
| 292 |
struct ssh_server_callbacks_struct server_cb = {
|
| 293 |
.userdata = &cb_data,
|
| 294 |
.auth_password_function = auth_password,
|
| 295 |
.channel_open_request_session_function = channel_open,
|
| 296 |
};
|
| 297 |
|
| 298 |
pid = fork();
|
| 299 |
|
| 300 |
if (pid > 0) // Parent process
|
| 301 |
{
|
| 302 |
SYS_child_process_count++;
|
| 303 |
log_common("Child process (%d) start\n", pid);
|
| 304 |
return pid;
|
| 305 |
}
|
| 306 |
else if (pid < 0) // Error
|
| 307 |
{
|
| 308 |
log_error("fork() error (%d)\n", errno);
|
| 309 |
return -1;
|
| 310 |
}
|
| 311 |
|
| 312 |
// Child process
|
| 313 |
|
| 314 |
if (close(socket_server[0]) == -1 || close(socket_server[1]) == -1)
|
| 315 |
{
|
| 316 |
log_error("Close server socket failed\n");
|
| 317 |
}
|
| 318 |
|
| 319 |
SSH_session = ssh_new();
|
| 320 |
|
| 321 |
if (SSH_v2)
|
| 322 |
{
|
| 323 |
if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
|
| 324 |
{
|
| 325 |
log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
|
| 326 |
goto cleanup;
|
| 327 |
}
|
| 328 |
|
| 329 |
ssh_bind_free(sshbind);
|
| 330 |
|
| 331 |
ssh_timeout = 60; // second
|
| 332 |
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
|
| 333 |
{
|
| 334 |
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
|
| 335 |
goto cleanup;
|
| 336 |
}
|
| 337 |
|
| 338 |
ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
|
| 339 |
|
| 340 |
ssh_callbacks_init(&server_cb);
|
| 341 |
ssh_callbacks_init(&channel_cb);
|
| 342 |
|
| 343 |
ssh_set_server_callbacks(SSH_session, &server_cb);
|
| 344 |
|
| 345 |
if (ssh_handle_key_exchange(SSH_session))
|
| 346 |
{
|
| 347 |
log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
|
| 348 |
goto cleanup;
|
| 349 |
}
|
| 350 |
|
| 351 |
event = ssh_event_new();
|
| 352 |
ssh_event_add_session(event, SSH_session);
|
| 353 |
|
| 354 |
for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
|
| 355 |
{
|
| 356 |
ret = ssh_event_dopoll(event, 100); // 0.1 second
|
| 357 |
if (ret == SSH_ERROR)
|
| 358 |
{
|
| 359 |
#ifdef _DEBUG
|
| 360 |
log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
|
| 361 |
#endif
|
| 362 |
goto cleanup;
|
| 363 |
}
|
| 364 |
}
|
| 365 |
|
| 366 |
if (cb_data.error)
|
| 367 |
{
|
| 368 |
log_error("SSH auth error, tried %d times\n", cb_data.tries);
|
| 369 |
goto cleanup;
|
| 370 |
}
|
| 371 |
|
| 372 |
ssh_set_channel_callbacks(SSH_channel, &channel_cb);
|
| 373 |
|
| 374 |
do
|
| 375 |
{
|
| 376 |
ret = ssh_event_dopoll(event, 100); // 0.1 second
|
| 377 |
if (ret == SSH_ERROR)
|
| 378 |
{
|
| 379 |
ssh_channel_close(SSH_channel);
|
| 380 |
}
|
| 381 |
|
| 382 |
if (ret == SSH_AGAIN) // loop until SSH connection is fully established
|
| 383 |
{
|
| 384 |
/* Executed only once, once the child process starts. */
|
| 385 |
cdata.event = event;
|
| 386 |
break;
|
| 387 |
}
|
| 388 |
} while (ssh_channel_is_open(SSH_channel));
|
| 389 |
|
| 390 |
ssh_timeout = 0;
|
| 391 |
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
|
| 392 |
{
|
| 393 |
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
|
| 394 |
goto cleanup;
|
| 395 |
}
|
| 396 |
}
|
| 397 |
|
| 398 |
// Redirect Input
|
| 399 |
close(STDIN_FILENO);
|
| 400 |
if (dup2(socket_client, STDIN_FILENO) == -1)
|
| 401 |
{
|
| 402 |
log_error("Redirect stdin to client socket failed\n");
|
| 403 |
goto cleanup;
|
| 404 |
}
|
| 405 |
|
| 406 |
// Redirect Output
|
| 407 |
close(STDOUT_FILENO);
|
| 408 |
if (dup2(socket_client, STDOUT_FILENO) == -1)
|
| 409 |
{
|
| 410 |
log_error("Redirect stdout to client socket failed\n");
|
| 411 |
goto cleanup;
|
| 412 |
}
|
| 413 |
|
| 414 |
SYS_child_process_count = 0;
|
| 415 |
|
| 416 |
bbs_main();
|
| 417 |
|
| 418 |
cleanup:
|
| 419 |
// Child process exit
|
| 420 |
SYS_server_exit = 1;
|
| 421 |
|
| 422 |
if (SSH_v2)
|
| 423 |
{
|
| 424 |
close(cdata.pty_master);
|
| 425 |
close(cdata.child_stdin);
|
| 426 |
close(cdata.child_stdout);
|
| 427 |
close(cdata.child_stderr);
|
| 428 |
|
| 429 |
ssh_channel_free(SSH_channel);
|
| 430 |
ssh_disconnect(SSH_session);
|
| 431 |
}
|
| 432 |
else if (close(socket_client) == -1)
|
| 433 |
{
|
| 434 |
log_error("Close client socket failed\n");
|
| 435 |
}
|
| 436 |
|
| 437 |
ssh_free(SSH_session);
|
| 438 |
ssh_finalize();
|
| 439 |
|
| 440 |
// Close Input and Output for client
|
| 441 |
close(STDIN_FILENO);
|
| 442 |
close(STDOUT_FILENO);
|
| 443 |
|
| 444 |
log_common("Process exit normally\n");
|
| 445 |
log_end();
|
| 446 |
|
| 447 |
_exit(0);
|
| 448 |
|
| 449 |
return 0;
|
| 450 |
}
|
| 451 |
|
| 452 |
int net_server(const char *hostaddr, in_port_t port[])
|
| 453 |
{
|
| 454 |
unsigned int addrlen;
|
| 455 |
int ret;
|
| 456 |
int flags[2];
|
| 457 |
struct sockaddr_in sin;
|
| 458 |
struct epoll_event ev, events[MAX_EVENTS];
|
| 459 |
int nfds, epollfd;
|
| 460 |
siginfo_t siginfo;
|
| 461 |
int notify_child_exit = 0;
|
| 462 |
time_t tm_notify_child_exit = time(NULL);
|
| 463 |
int sd_notify_stopping = 0;
|
| 464 |
MENU_SET bbs_menu_new;
|
| 465 |
MENU_SET top10_menu_new;
|
| 466 |
int i, j;
|
| 467 |
pid_t pid;
|
| 468 |
int ssh_log_level = SSH_LOG_NOLOG;
|
| 469 |
|
| 470 |
ssh_init();
|
| 471 |
|
| 472 |
sshbind = ssh_bind_new();
|
| 473 |
|
| 474 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
|
| 475 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
|
| 476 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 ||
|
| 477 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 ||
|
| 478 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
|
| 479 |
{
|
| 480 |
log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
|
| 481 |
ssh_bind_free(sshbind);
|
| 482 |
return -1;
|
| 483 |
}
|
| 484 |
|
| 485 |
epollfd = epoll_create1(0);
|
| 486 |
if (epollfd < 0)
|
| 487 |
{
|
| 488 |
log_error("epoll_create1() error (%d)\n", errno);
|
| 489 |
return -1;
|
| 490 |
}
|
| 491 |
|
| 492 |
// Server socket
|
| 493 |
for (i = 0; i < 2; i++)
|
| 494 |
{
|
| 495 |
socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
| 496 |
|
| 497 |
if (socket_server[i] < 0)
|
| 498 |
{
|
| 499 |
log_error("Create socket_server error (%d)\n", errno);
|
| 500 |
return -1;
|
| 501 |
}
|
| 502 |
|
| 503 |
sin.sin_family = AF_INET;
|
| 504 |
sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
|
| 505 |
sin.sin_port = htons(port[i]);
|
| 506 |
|
| 507 |
// Reuse address and port
|
| 508 |
flags[i] = 1;
|
| 509 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
|
| 510 |
{
|
| 511 |
log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
|
| 512 |
}
|
| 513 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
|
| 514 |
{
|
| 515 |
log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
|
| 516 |
}
|
| 517 |
|
| 518 |
if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
|
| 519 |
{
|
| 520 |
log_error("Bind address %s:%u error (%d)\n",
|
| 521 |
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
|
| 522 |
return -1;
|
| 523 |
}
|
| 524 |
|
| 525 |
if (listen(socket_server[i], 10) < 0)
|
| 526 |
{
|
| 527 |
log_error("Telnet socket listen error (%d)\n", errno);
|
| 528 |
return -1;
|
| 529 |
}
|
| 530 |
|
| 531 |
log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
|
| 532 |
|
| 533 |
ev.events = EPOLLIN;
|
| 534 |
ev.data.fd = socket_server[i];
|
| 535 |
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
|
| 536 |
{
|
| 537 |
log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
|
| 538 |
if (close(epollfd) < 0)
|
| 539 |
{
|
| 540 |
log_error("close(epoll) error (%d)\n");
|
| 541 |
}
|
| 542 |
return -1;
|
| 543 |
}
|
| 544 |
|
| 545 |
flags[i] = fcntl(socket_server[i], F_GETFL, 0);
|
| 546 |
fcntl(socket_server[i], F_SETFL, flags[i] | O_NONBLOCK);
|
| 547 |
}
|
| 548 |
|
| 549 |
// Startup complete
|
| 550 |
sd_notifyf(0, "READY=1\n"
|
| 551 |
"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
|
| 552 |
"MAINPID=%d",
|
| 553 |
hostaddr, port[0], hostaddr, port[1], getpid());
|
| 554 |
|
| 555 |
while (!SYS_server_exit || SYS_child_process_count > 0)
|
| 556 |
{
|
| 557 |
if (SYS_server_exit && !sd_notify_stopping)
|
| 558 |
{
|
| 559 |
sd_notify(0, "STOPPING=1");
|
| 560 |
sd_notify_stopping = 1;
|
| 561 |
}
|
| 562 |
|
| 563 |
while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
|
| 564 |
{
|
| 565 |
SYS_child_exit = 0;
|
| 566 |
|
| 567 |
siginfo.si_pid = 0;
|
| 568 |
ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
|
| 569 |
if (ret == 0 && siginfo.si_pid > 0)
|
| 570 |
{
|
| 571 |
SYS_child_exit = 1; // Retry waitid
|
| 572 |
|
| 573 |
SYS_child_process_count--;
|
| 574 |
log_common("Child process (%d) exited\n", siginfo.si_pid);
|
| 575 |
|
| 576 |
if (siginfo.si_pid != section_list_loader_pid)
|
| 577 |
{
|
| 578 |
i = 0;
|
| 579 |
for (; i < BBS_max_client; i++)
|
| 580 |
{
|
| 581 |
if (process_sockaddr_pool[i].pid == siginfo.si_pid)
|
| 582 |
{
|
| 583 |
process_sockaddr_pool[i].pid = 0;
|
| 584 |
break;
|
| 585 |
}
|
| 586 |
}
|
| 587 |
if (i >= BBS_max_client)
|
| 588 |
{
|
| 589 |
log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
|
| 590 |
}
|
| 591 |
}
|
| 592 |
}
|
| 593 |
else if (ret == 0)
|
| 594 |
{
|
| 595 |
break;
|
| 596 |
}
|
| 597 |
else if (ret < 0)
|
| 598 |
{
|
| 599 |
log_error("Error in waitid: %d\n", errno);
|
| 600 |
break;
|
| 601 |
}
|
| 602 |
}
|
| 603 |
|
| 604 |
if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
|
| 605 |
{
|
| 606 |
if (notify_child_exit == 0)
|
| 607 |
{
|
| 608 |
sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count);
|
| 609 |
log_common("Notify %d child process to exit\n", SYS_child_process_count);
|
| 610 |
|
| 611 |
if (kill(0, SIGTERM) < 0)
|
| 612 |
{
|
| 613 |
log_error("Send SIGTERM signal failed (%d)\n", errno);
|
| 614 |
}
|
| 615 |
|
| 616 |
notify_child_exit = 1;
|
| 617 |
tm_notify_child_exit = time(NULL);
|
| 618 |
}
|
| 619 |
else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT)
|
| 620 |
{
|
| 621 |
sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count);
|
| 622 |
|
| 623 |
for (i = 0; i < BBS_max_client; i++)
|
| 624 |
{
|
| 625 |
if (process_sockaddr_pool[i].pid != 0)
|
| 626 |
{
|
| 627 |
log_error("Kill child process (pid=%d)\n", process_sockaddr_pool[i].pid);
|
| 628 |
if (kill(process_sockaddr_pool[i].pid, SIGKILL) < 0)
|
| 629 |
{
|
| 630 |
log_error("Send SIGKILL signal failed (%d)\n", errno);
|
| 631 |
}
|
| 632 |
}
|
| 633 |
}
|
| 634 |
|
| 635 |
notify_child_exit = 2;
|
| 636 |
tm_notify_child_exit = time(NULL);
|
| 637 |
}
|
| 638 |
else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT)
|
| 639 |
{
|
| 640 |
log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count);
|
| 641 |
SYS_child_process_count = 0;
|
| 642 |
}
|
| 643 |
}
|
| 644 |
|
| 645 |
if (SYS_conf_reload && !SYS_server_exit)
|
| 646 |
{
|
| 647 |
SYS_conf_reload = 0;
|
| 648 |
sd_notify(0, "RELOADING=1");
|
| 649 |
|
| 650 |
// Reload configuration
|
| 651 |
if (load_conf(CONF_BBSD) < 0)
|
| 652 |
{
|
| 653 |
log_error("Reload conf failed\n");
|
| 654 |
}
|
| 655 |
|
| 656 |
if (load_menu(&bbs_menu_new, CONF_MENU) < 0)
|
| 657 |
{
|
| 658 |
unload_menu(&bbs_menu_new);
|
| 659 |
log_error("Reload bbs menu failed\n");
|
| 660 |
}
|
| 661 |
else
|
| 662 |
{
|
| 663 |
unload_menu(&bbs_menu);
|
| 664 |
memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
|
| 665 |
log_common("Reload bbs menu successfully\n");
|
| 666 |
}
|
| 667 |
|
| 668 |
if (load_menu(&top10_menu_new, CONF_TOP10_MENU) < 0)
|
| 669 |
{
|
| 670 |
unload_menu(&top10_menu_new);
|
| 671 |
log_error("Reload top10 menu failed\n");
|
| 672 |
}
|
| 673 |
else
|
| 674 |
{
|
| 675 |
unload_menu(&top10_menu);
|
| 676 |
top10_menu_new.allow_exit = 1;
|
| 677 |
memcpy(&top10_menu, &top10_menu_new, sizeof(top10_menu_new));
|
| 678 |
log_common("Reload top10 menu successfully\n");
|
| 679 |
}
|
| 680 |
|
| 681 |
for (int i = 0; i < data_files_load_startup_count; i++)
|
| 682 |
{
|
| 683 |
if (load_file(data_files_load_startup[i]) < 0)
|
| 684 |
{
|
| 685 |
log_error("load_file(%s) error\n", data_files_load_startup[i]);
|
| 686 |
}
|
| 687 |
}
|
| 688 |
log_common("Reload data files successfully\n");
|
| 689 |
|
| 690 |
// Load section config and gen_ex
|
| 691 |
if (load_section_config_from_db(1) < 0)
|
| 692 |
{
|
| 693 |
log_error("load_section_config_from_db(1) error\n");
|
| 694 |
}
|
| 695 |
else
|
| 696 |
{
|
| 697 |
log_common("Reload section config and gen_ex successfully\n");
|
| 698 |
}
|
| 699 |
|
| 700 |
sd_notify(0, "READY=1");
|
| 701 |
}
|
| 702 |
|
| 703 |
nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
|
| 704 |
|
| 705 |
if (nfds < 0)
|
| 706 |
{
|
| 707 |
if (errno != EINTR)
|
| 708 |
{
|
| 709 |
log_error("epoll_wait() error (%d)\n", errno);
|
| 710 |
break;
|
| 711 |
}
|
| 712 |
continue;
|
| 713 |
}
|
| 714 |
|
| 715 |
// Stop accept new connection on exit
|
| 716 |
if (SYS_server_exit)
|
| 717 |
{
|
| 718 |
continue;
|
| 719 |
}
|
| 720 |
|
| 721 |
for (int i = 0; i < nfds; i++)
|
| 722 |
{
|
| 723 |
if (events[i].data.fd == socket_server[0] || events[i].data.fd == socket_server[1])
|
| 724 |
{
|
| 725 |
SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
|
| 726 |
|
| 727 |
while (!SYS_server_exit) // Accept all incoming connections until error
|
| 728 |
{
|
| 729 |
addrlen = sizeof(sin);
|
| 730 |
socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
|
| 731 |
if (socket_client < 0)
|
| 732 |
{
|
| 733 |
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
| 734 |
{
|
| 735 |
break;
|
| 736 |
}
|
| 737 |
else if (errno == EINTR)
|
| 738 |
{
|
| 739 |
continue;
|
| 740 |
}
|
| 741 |
else
|
| 742 |
{
|
| 743 |
log_error("accept(socket_server) error (%d)\n", errno);
|
| 744 |
break;
|
| 745 |
}
|
| 746 |
}
|
| 747 |
|
| 748 |
strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
|
| 749 |
hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
|
| 750 |
|
| 751 |
port_client = ntohs(sin.sin_port);
|
| 752 |
|
| 753 |
log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
|
| 754 |
|
| 755 |
if (SYS_child_process_count - 1 < BBS_max_client)
|
| 756 |
{
|
| 757 |
j = 0;
|
| 758 |
for (i = 0; i < BBS_max_client; i++)
|
| 759 |
{
|
| 760 |
if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
|
| 761 |
{
|
| 762 |
j++;
|
| 763 |
if (j >= BBS_max_client_per_ip)
|
| 764 |
{
|
| 765 |
log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
|
| 766 |
break;
|
| 767 |
}
|
| 768 |
}
|
| 769 |
}
|
| 770 |
|
| 771 |
if (j < BBS_max_client_per_ip)
|
| 772 |
{
|
| 773 |
if ((pid = fork_server()) < 0)
|
| 774 |
{
|
| 775 |
log_error("fork_server() error\n");
|
| 776 |
}
|
| 777 |
else if (pid > 0)
|
| 778 |
{
|
| 779 |
i = 0;
|
| 780 |
for (; i < BBS_max_client; i++)
|
| 781 |
{
|
| 782 |
if (process_sockaddr_pool[i].pid == 0)
|
| 783 |
{
|
| 784 |
break;
|
| 785 |
}
|
| 786 |
}
|
| 787 |
|
| 788 |
if (i >= BBS_max_client)
|
| 789 |
{
|
| 790 |
log_error("Process sockaddr pool depleted\n");
|
| 791 |
}
|
| 792 |
else
|
| 793 |
{
|
| 794 |
process_sockaddr_pool[i].pid = pid;
|
| 795 |
process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
|
| 796 |
}
|
| 797 |
}
|
| 798 |
}
|
| 799 |
}
|
| 800 |
else
|
| 801 |
{
|
| 802 |
log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
|
| 803 |
}
|
| 804 |
|
| 805 |
if (close(socket_client) == -1)
|
| 806 |
{
|
| 807 |
log_error("close(socket_lient) error (%d)\n", errno);
|
| 808 |
}
|
| 809 |
}
|
| 810 |
}
|
| 811 |
}
|
| 812 |
}
|
| 813 |
|
| 814 |
if (close(epollfd) < 0)
|
| 815 |
{
|
| 816 |
log_error("close(epoll) error (%d)\n");
|
| 817 |
}
|
| 818 |
|
| 819 |
for (i = 0; i < 2; i++)
|
| 820 |
{
|
| 821 |
fcntl(socket_server[i], F_SETFL, flags[i]);
|
| 822 |
|
| 823 |
if (close(socket_server[i]) == -1)
|
| 824 |
{
|
| 825 |
log_error("Close server socket failed\n");
|
| 826 |
}
|
| 827 |
}
|
| 828 |
|
| 829 |
ssh_bind_free(sshbind);
|
| 830 |
ssh_finalize();
|
| 831 |
|
| 832 |
return 0;
|
| 833 |
}
|
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