| 1 |
/* SPDX-License-Identifier: GPL-3.0-or-later */
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| 2 |
/*
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| 3 |
* net_server
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| 4 |
* - network server with SSH support
|
| 5 |
*
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| 6 |
* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
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| 7 |
*/
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| 9 |
#ifdef HAVE_CONFIG_H
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| 10 |
#include "config.h"
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| 11 |
#endif
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| 12 |
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| 13 |
#include "bbs.h"
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| 14 |
#include "bbs_main.h"
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| 15 |
#include "bwf.h"
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| 16 |
#include "common.h"
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| 17 |
#include "database.h"
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| 18 |
#include "file_loader.h"
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| 19 |
#include "hash_dict.h"
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| 20 |
#include "io.h"
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| 21 |
#include "init.h"
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| 22 |
#include "log.h"
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| 23 |
#include "login.h"
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| 24 |
#include "menu.h"
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| 25 |
#include "net_server.h"
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| 26 |
#include "section_list.h"
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| 27 |
#include "section_list_loader.h"
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| 28 |
#include <errno.h>
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| 29 |
#include <fcntl.h>
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| 30 |
#include <pty.h>
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| 31 |
#include <signal.h>
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| 32 |
#include <stdlib.h>
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| 33 |
#include <string.h>
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| 34 |
#include <unistd.h>
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| 35 |
#include <utmp.h>
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| 36 |
#include <arpa/inet.h>
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| 37 |
#include <libssh/callbacks.h>
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| 38 |
#include <libssh/libssh.h>
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| 39 |
#include <libssh/server.h>
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| 40 |
#include <netinet/in.h>
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| 41 |
#include <sys/ioctl.h>
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| 42 |
#include <sys/socket.h>
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| 43 |
#include <sys/stat.h>
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| 44 |
#include <sys/types.h>
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| 45 |
#include <sys/wait.h>
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| 46 |
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| 47 |
#ifdef HAVE_SYS_EPOLL_H
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| 48 |
#include <sys/epoll.h>
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| 49 |
#else
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| 50 |
#include <poll.h>
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| 51 |
#endif
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| 52 |
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| 53 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
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| 54 |
#include <systemd/sd-daemon.h>
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| 55 |
#endif
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| 56 |
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| 57 |
enum _net_server_constant_t
|
| 58 |
{
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| 59 |
WAIT_CHILD_PROCESS_EXIT_TIMEOUT = 5, // second
|
| 60 |
WAIT_CHILD_PROCESS_KILL_TIMEOUT = 1, // second
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| 61 |
|
| 62 |
SSH_AUTH_MAX_DURATION = 60 * 1000, // milliseconds
|
| 63 |
};
|
| 64 |
|
| 65 |
/* A userdata struct for session. */
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| 66 |
struct session_data_struct
|
| 67 |
{
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| 68 |
int tries;
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| 69 |
int error;
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| 70 |
};
|
| 71 |
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| 72 |
/* A userdata struct for channel. */
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| 73 |
struct channel_data_struct
|
| 74 |
{
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| 75 |
/* pid of the child process the channel will spawn. */
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| 76 |
pid_t pid;
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| 77 |
/* For PTY allocation */
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| 78 |
socket_t pty_master;
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| 79 |
socket_t pty_slave;
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| 80 |
/* For communication with the child process. */
|
| 81 |
socket_t child_stdin;
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| 82 |
socket_t child_stdout;
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| 83 |
/* Only used for subsystem and exec requests. */
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| 84 |
socket_t child_stderr;
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| 85 |
/* Event which is used to poll the above descriptors. */
|
| 86 |
ssh_event event;
|
| 87 |
/* Terminal size struct. */
|
| 88 |
struct winsize *winsize;
|
| 89 |
};
|
| 90 |
|
| 91 |
static int socket_server[2];
|
| 92 |
static int socket_client;
|
| 93 |
|
| 94 |
#ifdef HAVE_SYS_EPOLL_H
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| 95 |
static int epollfd_server = -1;
|
| 96 |
#endif
|
| 97 |
|
| 98 |
static ssh_bind sshbind;
|
| 99 |
|
| 100 |
static HASH_DICT *hash_dict_pid_sockaddr = NULL;
|
| 101 |
static HASH_DICT *hash_dict_sockaddr_count = NULL;
|
| 102 |
|
| 103 |
static const char SFTP_SERVER_PATH[] = "/usr/lib/sftp-server";
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| 104 |
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| 105 |
static int auth_password(ssh_session session, const char *user,
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| 106 |
const char *password, void *userdata)
|
| 107 |
{
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| 108 |
struct session_data_struct *sdata = (struct session_data_struct *)userdata;
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| 109 |
int ret;
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| 110 |
|
| 111 |
if (strcmp(user, "guest") == 0)
|
| 112 |
{
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| 113 |
ret = load_guest_info();
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| 114 |
}
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| 115 |
else
|
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{
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| 117 |
ret = check_user(user, password);
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| 118 |
if (ret == 2) // Enforce update user agreement
|
| 119 |
{
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| 120 |
BBS_update_eula = 1;
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| 121 |
ret = 0;
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| 122 |
}
|
| 123 |
}
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| 124 |
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| 125 |
if (ret == 0)
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| 126 |
{
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| 127 |
return SSH_AUTH_SUCCESS;
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| 128 |
}
|
| 129 |
|
| 130 |
if ((++(sdata->tries)) >= BBS_login_retry_times)
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{
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| 132 |
sdata->error = 1;
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}
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| 134 |
|
| 135 |
return SSH_AUTH_DENIED;
|
| 136 |
}
|
| 137 |
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| 138 |
static int pty_request(ssh_session session, ssh_channel channel, const char *term,
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| 139 |
int cols, int rows, int px, int py, void *userdata)
|
| 140 |
{
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| 141 |
struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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| 142 |
int rc;
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| 143 |
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| 144 |
(void)session;
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| 145 |
(void)channel;
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| 146 |
(void)term;
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| 147 |
|
| 148 |
cdata->winsize->ws_row = (unsigned short int)rows;
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| 149 |
cdata->winsize->ws_col = (unsigned short int)cols;
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| 150 |
cdata->winsize->ws_xpixel = (unsigned short int)px;
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| 151 |
cdata->winsize->ws_ypixel = (unsigned short int)py;
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| 152 |
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| 153 |
rc = openpty(&cdata->pty_master, &cdata->pty_slave, NULL, NULL, cdata->winsize);
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| 154 |
if (rc != 0)
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{
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log_error("Failed to open pty\n");
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| 157 |
return SSH_ERROR;
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}
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| 160 |
return SSH_OK;
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}
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| 163 |
static int pty_resize(ssh_session session, ssh_channel channel, int cols, int rows,
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| 164 |
int py, int px, void *userdata)
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| 165 |
{
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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| 168 |
(void)session;
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(void)channel;
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| 171 |
cdata->winsize->ws_row = (unsigned short int)rows;
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cdata->winsize->ws_col = (unsigned short int)cols;
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| 173 |
cdata->winsize->ws_xpixel = (unsigned short int)px;
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cdata->winsize->ws_ypixel = (unsigned short int)py;
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| 175 |
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| 176 |
if (cdata->pty_master != -1)
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| 177 |
{
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| 178 |
return ioctl(cdata->pty_master, TIOCSWINSZ, cdata->winsize);
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}
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| 180 |
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| 181 |
return SSH_ERROR;
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| 182 |
}
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| 183 |
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| 184 |
static int exec_pty(const char *mode, const char *command, struct channel_data_struct *cdata)
|
| 185 |
{
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| 186 |
(void)cdata;
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| 187 |
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| 188 |
if (command != NULL)
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| 189 |
{
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| 190 |
log_error("Forbid exec /bin/sh %s %s)\n", mode, command);
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| 191 |
}
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| 192 |
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| 193 |
return SSH_OK;
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| 194 |
}
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| 195 |
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| 196 |
static int exec_nopty(const char *command, struct channel_data_struct *cdata)
|
| 197 |
{
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| 198 |
(void)cdata;
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| 199 |
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| 200 |
if (command != NULL)
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| 201 |
{
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| 202 |
log_error("Forbid exec /bin/sh -c %s)\n", command);
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| 203 |
}
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| 204 |
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| 205 |
return SSH_OK;
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}
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| 207 |
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| 208 |
static int exec_request(ssh_session session, ssh_channel channel, const char *command, void *userdata)
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| 209 |
{
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| 210 |
struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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| 212 |
(void)session;
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(void)channel;
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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("-c", command, cdata);
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}
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return exec_nopty(command, cdata);
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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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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata;
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| 231 |
(void)session;
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(void)channel;
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| 234 |
if (cdata->pid > 0)
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{
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return SSH_ERROR;
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}
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| 239 |
if (cdata->pty_master != -1 && cdata->pty_slave != -1)
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{
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| 241 |
return exec_pty("-l", NULL, cdata);
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}
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| 243 |
/* Client requested a shell without a pty, let's pretend we allow that */
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| 244 |
return SSH_OK;
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}
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| 246 |
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| 247 |
static int subsystem_request(ssh_session session, ssh_channel channel, const char *subsystem, void *userdata)
|
| 248 |
{
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| 249 |
(void)session;
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| 250 |
(void)channel;
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| 251 |
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| 252 |
log_error("subsystem_request(subsystem=%s)\n", subsystem);
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| 253 |
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| 254 |
/* subsystem requests behave similarly to exec requests. */
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| 255 |
if (strcmp(subsystem, "sftp") == 0)
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| 256 |
{
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| 257 |
return exec_request(session, channel, SFTP_SERVER_PATH, userdata);
|
| 258 |
}
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| 259 |
return SSH_ERROR;
|
| 260 |
}
|
| 261 |
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| 262 |
static ssh_channel channel_open(ssh_session session, void *userdata)
|
| 263 |
{
|
| 264 |
(void)userdata;
|
| 265 |
|
| 266 |
if (SSH_channel != NULL)
|
| 267 |
{
|
| 268 |
return NULL;
|
| 269 |
}
|
| 270 |
|
| 271 |
SSH_channel = ssh_channel_new(session);
|
| 272 |
|
| 273 |
return SSH_channel;
|
| 274 |
}
|
| 275 |
|
| 276 |
static int fork_server(void)
|
| 277 |
{
|
| 278 |
ssh_event event;
|
| 279 |
long int ssh_timeout = 0;
|
| 280 |
int pid;
|
| 281 |
int i;
|
| 282 |
int ret;
|
| 283 |
|
| 284 |
/* Structure for storing the pty size. */
|
| 285 |
struct winsize wsize = {
|
| 286 |
.ws_row = 0,
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| 287 |
.ws_col = 0,
|
| 288 |
.ws_xpixel = 0,
|
| 289 |
.ws_ypixel = 0};
|
| 290 |
|
| 291 |
/* Our struct holding information about the channel. */
|
| 292 |
struct channel_data_struct cdata = {
|
| 293 |
.pid = 0,
|
| 294 |
.pty_master = -1,
|
| 295 |
.pty_slave = -1,
|
| 296 |
.child_stdin = -1,
|
| 297 |
.child_stdout = -1,
|
| 298 |
.child_stderr = -1,
|
| 299 |
.event = NULL,
|
| 300 |
.winsize = &wsize};
|
| 301 |
|
| 302 |
struct session_data_struct cb_data = {
|
| 303 |
.tries = 0,
|
| 304 |
.error = 0,
|
| 305 |
};
|
| 306 |
|
| 307 |
struct ssh_channel_callbacks_struct channel_cb = {
|
| 308 |
.userdata = &cdata,
|
| 309 |
.channel_pty_request_function = pty_request,
|
| 310 |
.channel_pty_window_change_function = pty_resize,
|
| 311 |
.channel_shell_request_function = shell_request,
|
| 312 |
.channel_exec_request_function = exec_request,
|
| 313 |
.channel_subsystem_request_function = subsystem_request};
|
| 314 |
|
| 315 |
struct ssh_server_callbacks_struct server_cb = {
|
| 316 |
.userdata = &cb_data,
|
| 317 |
.auth_password_function = auth_password,
|
| 318 |
.channel_open_request_session_function = channel_open,
|
| 319 |
};
|
| 320 |
|
| 321 |
pid = fork();
|
| 322 |
|
| 323 |
if (pid > 0) // Parent process
|
| 324 |
{
|
| 325 |
SYS_child_process_count++;
|
| 326 |
log_common("Child process (%d) start\n", pid);
|
| 327 |
return pid;
|
| 328 |
}
|
| 329 |
else if (pid < 0) // Error
|
| 330 |
{
|
| 331 |
log_error("fork() error (%d)\n", errno);
|
| 332 |
return -1;
|
| 333 |
}
|
| 334 |
|
| 335 |
// Child process
|
| 336 |
#ifdef HAVE_SYS_EPOLL_H
|
| 337 |
if (close(epollfd_server) < 0)
|
| 338 |
{
|
| 339 |
log_error("close(epollfd_server) error (%d)\n");
|
| 340 |
}
|
| 341 |
#endif
|
| 342 |
|
| 343 |
for (i = 0; i < 2; i++)
|
| 344 |
{
|
| 345 |
if (close(socket_server[i]) == -1)
|
| 346 |
{
|
| 347 |
log_error("Close server socket failed\n");
|
| 348 |
}
|
| 349 |
}
|
| 350 |
|
| 351 |
hash_dict_destroy(hash_dict_pid_sockaddr);
|
| 352 |
hash_dict_destroy(hash_dict_sockaddr_count);
|
| 353 |
|
| 354 |
SSH_session = ssh_new();
|
| 355 |
|
| 356 |
if (SSH_v2)
|
| 357 |
{
|
| 358 |
if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
|
| 359 |
{
|
| 360 |
log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
|
| 361 |
goto cleanup;
|
| 362 |
}
|
| 363 |
|
| 364 |
ssh_bind_free(sshbind);
|
| 365 |
|
| 366 |
ssh_timeout = 60; // second
|
| 367 |
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
|
| 368 |
{
|
| 369 |
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
|
| 370 |
goto cleanup;
|
| 371 |
}
|
| 372 |
|
| 373 |
ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
|
| 374 |
|
| 375 |
ssh_callbacks_init(&server_cb);
|
| 376 |
ssh_callbacks_init(&channel_cb);
|
| 377 |
|
| 378 |
ssh_set_server_callbacks(SSH_session, &server_cb);
|
| 379 |
|
| 380 |
if (ssh_handle_key_exchange(SSH_session))
|
| 381 |
{
|
| 382 |
log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
|
| 383 |
goto cleanup;
|
| 384 |
}
|
| 385 |
|
| 386 |
event = ssh_event_new();
|
| 387 |
ssh_event_add_session(event, SSH_session);
|
| 388 |
|
| 389 |
for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
|
| 390 |
{
|
| 391 |
ret = ssh_event_dopoll(event, 100); // 0.1 second
|
| 392 |
if (ret == SSH_ERROR)
|
| 393 |
{
|
| 394 |
log_debug("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
|
| 395 |
goto cleanup;
|
| 396 |
}
|
| 397 |
}
|
| 398 |
|
| 399 |
if (cb_data.error)
|
| 400 |
{
|
| 401 |
log_error("SSH auth error, tried %d times\n", cb_data.tries);
|
| 402 |
goto cleanup;
|
| 403 |
}
|
| 404 |
|
| 405 |
ssh_set_channel_callbacks(SSH_channel, &channel_cb);
|
| 406 |
|
| 407 |
do
|
| 408 |
{
|
| 409 |
ret = ssh_event_dopoll(event, 100); // 0.1 second
|
| 410 |
if (ret == SSH_ERROR)
|
| 411 |
{
|
| 412 |
ssh_channel_close(SSH_channel);
|
| 413 |
}
|
| 414 |
|
| 415 |
if (ret == SSH_AGAIN) // loop until SSH connection is fully established
|
| 416 |
{
|
| 417 |
/* Executed only once, once the child process starts. */
|
| 418 |
cdata.event = event;
|
| 419 |
break;
|
| 420 |
}
|
| 421 |
} while (ssh_channel_is_open(SSH_channel));
|
| 422 |
|
| 423 |
ssh_timeout = 0;
|
| 424 |
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
|
| 425 |
{
|
| 426 |
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
|
| 427 |
goto cleanup;
|
| 428 |
}
|
| 429 |
|
| 430 |
ssh_set_blocking(SSH_session, 0);
|
| 431 |
}
|
| 432 |
|
| 433 |
// Redirect Input
|
| 434 |
if (dup2(socket_client, STDIN_FILENO) == -1)
|
| 435 |
{
|
| 436 |
log_error("Redirect stdin to client socket failed\n");
|
| 437 |
goto cleanup;
|
| 438 |
}
|
| 439 |
|
| 440 |
// Redirect Output
|
| 441 |
if (dup2(socket_client, STDOUT_FILENO) == -1)
|
| 442 |
{
|
| 443 |
log_error("Redirect stdout to client socket failed\n");
|
| 444 |
goto cleanup;
|
| 445 |
}
|
| 446 |
|
| 447 |
if (io_init() < 0)
|
| 448 |
{
|
| 449 |
log_error("io_init() error\n");
|
| 450 |
goto cleanup;
|
| 451 |
}
|
| 452 |
|
| 453 |
SYS_child_process_count = 0;
|
| 454 |
|
| 455 |
// BWF compile
|
| 456 |
if (bwf_compile() < 0)
|
| 457 |
{
|
| 458 |
log_error("bwf_compile() error\n");
|
| 459 |
goto cleanup;
|
| 460 |
}
|
| 461 |
|
| 462 |
bbs_main();
|
| 463 |
|
| 464 |
cleanup:
|
| 465 |
// Child process exit
|
| 466 |
SYS_server_exit = 1;
|
| 467 |
|
| 468 |
if (SSH_v2)
|
| 469 |
{
|
| 470 |
if (cdata.pty_master != -1)
|
| 471 |
{
|
| 472 |
close(cdata.pty_master);
|
| 473 |
}
|
| 474 |
if (cdata.child_stdin != -1)
|
| 475 |
{
|
| 476 |
close(cdata.child_stdin);
|
| 477 |
}
|
| 478 |
if (cdata.child_stdout != -1)
|
| 479 |
{
|
| 480 |
close(cdata.child_stdout);
|
| 481 |
}
|
| 482 |
if (cdata.child_stderr != -1)
|
| 483 |
{
|
| 484 |
close(cdata.child_stderr);
|
| 485 |
}
|
| 486 |
|
| 487 |
ssh_channel_free(SSH_channel);
|
| 488 |
ssh_disconnect(SSH_session);
|
| 489 |
}
|
| 490 |
else if (close(socket_client) == -1)
|
| 491 |
{
|
| 492 |
log_error("Close client socket failed\n");
|
| 493 |
}
|
| 494 |
|
| 495 |
ssh_free(SSH_session);
|
| 496 |
ssh_finalize();
|
| 497 |
|
| 498 |
// BWF cleanup
|
| 499 |
bwf_cleanup();
|
| 500 |
|
| 501 |
// Close Input and Output for client
|
| 502 |
io_cleanup();
|
| 503 |
close(STDIN_FILENO);
|
| 504 |
close(STDOUT_FILENO);
|
| 505 |
|
| 506 |
log_common("Process exit normally\n");
|
| 507 |
log_end();
|
| 508 |
|
| 509 |
_exit(0);
|
| 510 |
|
| 511 |
return 0;
|
| 512 |
}
|
| 513 |
|
| 514 |
int net_server(const char *hostaddr, in_port_t port[])
|
| 515 |
{
|
| 516 |
struct stat file_stat;
|
| 517 |
unsigned int addrlen;
|
| 518 |
int ret;
|
| 519 |
int flags_server[2];
|
| 520 |
struct sockaddr_in sin;
|
| 521 |
|
| 522 |
#ifdef HAVE_SYS_EPOLL_H
|
| 523 |
struct epoll_event ev, events[MAX_EVENTS];
|
| 524 |
#else
|
| 525 |
struct pollfd pfds[2];
|
| 526 |
#endif
|
| 527 |
|
| 528 |
int nfds;
|
| 529 |
int notify_child_exit = 0;
|
| 530 |
time_t tm_notify_child_exit = time(NULL);
|
| 531 |
pid_t pid;
|
| 532 |
int ssh_key_valid = 0;
|
| 533 |
int ssh_log_level = SSH_LOG_NOLOG;
|
| 534 |
|
| 535 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 536 |
int sd_notify_stopping = 0;
|
| 537 |
#endif
|
| 538 |
|
| 539 |
ssh_init();
|
| 540 |
|
| 541 |
sshbind = ssh_bind_new();
|
| 542 |
|
| 543 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_RSA_KEY_FILE) < 0)
|
| 544 |
{
|
| 545 |
log_error("Error loading SSH RSA key: %s\n", SSH_HOST_RSA_KEY_FILE);
|
| 546 |
}
|
| 547 |
else
|
| 548 |
{
|
| 549 |
ssh_key_valid = 1;
|
| 550 |
}
|
| 551 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_ED25519_KEY_FILE) < 0)
|
| 552 |
{
|
| 553 |
log_error("Error loading SSH ED25519 key: %s\n", SSH_HOST_ED25519_KEY_FILE);
|
| 554 |
}
|
| 555 |
else
|
| 556 |
{
|
| 557 |
ssh_key_valid = 1;
|
| 558 |
}
|
| 559 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_ECDSA_KEY_FILE) < 0)
|
| 560 |
{
|
| 561 |
log_error("Error loading SSH ECDSA key: %s\n", SSH_HOST_ECDSA_KEY_FILE);
|
| 562 |
}
|
| 563 |
else
|
| 564 |
{
|
| 565 |
ssh_key_valid = 1;
|
| 566 |
}
|
| 567 |
|
| 568 |
if (!ssh_key_valid)
|
| 569 |
{
|
| 570 |
log_error("Error: no valid SSH host key\n");
|
| 571 |
ssh_bind_free(sshbind);
|
| 572 |
return -1;
|
| 573 |
}
|
| 574 |
|
| 575 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
|
| 576 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
|
| 577 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "+ssh-ed25519,ecdsa-sha2-nistp256,ssh-rsa") < 0 ||
|
| 578 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
|
| 579 |
{
|
| 580 |
log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
|
| 581 |
ssh_bind_free(sshbind);
|
| 582 |
return -1;
|
| 583 |
}
|
| 584 |
|
| 585 |
#ifdef HAVE_SYS_EPOLL_H
|
| 586 |
epollfd_server = epoll_create1(0);
|
| 587 |
if (epollfd_server == -1)
|
| 588 |
{
|
| 589 |
log_error("epoll_create1() error (%d)\n", errno);
|
| 590 |
return -1;
|
| 591 |
}
|
| 592 |
#endif
|
| 593 |
|
| 594 |
// Server socket
|
| 595 |
for (int i = 0; i < 2; i++)
|
| 596 |
{
|
| 597 |
socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
| 598 |
|
| 599 |
if (socket_server[i] < 0)
|
| 600 |
{
|
| 601 |
log_error("Create socket_server error (%d)\n", errno);
|
| 602 |
return -1;
|
| 603 |
}
|
| 604 |
|
| 605 |
sin.sin_family = AF_INET;
|
| 606 |
sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
|
| 607 |
sin.sin_port = htons(port[i]);
|
| 608 |
|
| 609 |
// Reuse address and port
|
| 610 |
flags_server[i] = 1;
|
| 611 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags_server[i], sizeof(flags_server[i])) < 0)
|
| 612 |
{
|
| 613 |
log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
|
| 614 |
}
|
| 615 |
#if defined(SO_REUSEPORT)
|
| 616 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags_server[i], sizeof(flags_server[i])) < 0)
|
| 617 |
{
|
| 618 |
log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
|
| 619 |
}
|
| 620 |
#endif
|
| 621 |
|
| 622 |
if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
|
| 623 |
{
|
| 624 |
log_error("Bind address %s:%u error (%d)\n",
|
| 625 |
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
|
| 626 |
return -1;
|
| 627 |
}
|
| 628 |
|
| 629 |
if (listen(socket_server[i], 10) < 0)
|
| 630 |
{
|
| 631 |
log_error("Telnet socket listen error (%d)\n", errno);
|
| 632 |
return -1;
|
| 633 |
}
|
| 634 |
|
| 635 |
log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
|
| 636 |
|
| 637 |
#ifdef HAVE_SYS_EPOLL_H
|
| 638 |
ev.events = EPOLLIN;
|
| 639 |
ev.data.fd = socket_server[i];
|
| 640 |
if (epoll_ctl(epollfd_server, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
|
| 641 |
{
|
| 642 |
log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
|
| 643 |
if (close(epollfd_server) < 0)
|
| 644 |
{
|
| 645 |
log_error("close(epoll) error (%d)\n");
|
| 646 |
}
|
| 647 |
return -1;
|
| 648 |
}
|
| 649 |
#endif
|
| 650 |
|
| 651 |
flags_server[i] = fcntl(socket_server[i], F_GETFL, 0);
|
| 652 |
fcntl(socket_server[i], F_SETFL, flags_server[i] | O_NONBLOCK);
|
| 653 |
}
|
| 654 |
|
| 655 |
ssh_bind_set_blocking(sshbind, 0);
|
| 656 |
|
| 657 |
hash_dict_pid_sockaddr = hash_dict_create(MAX_CLIENT_LIMIT);
|
| 658 |
if (hash_dict_pid_sockaddr == NULL)
|
| 659 |
{
|
| 660 |
log_error("hash_dict_create(hash_dict_pid_sockaddr) error\n");
|
| 661 |
return -1;
|
| 662 |
}
|
| 663 |
hash_dict_sockaddr_count = hash_dict_create(MAX_CLIENT_LIMIT);
|
| 664 |
if (hash_dict_sockaddr_count == NULL)
|
| 665 |
{
|
| 666 |
log_error("hash_dict_create(hash_dict_sockaddr_count) error\n");
|
| 667 |
return -1;
|
| 668 |
}
|
| 669 |
|
| 670 |
// Startup complete
|
| 671 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 672 |
sd_notifyf(0, "READY=1\n"
|
| 673 |
"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
|
| 674 |
"MAINPID=%d",
|
| 675 |
hostaddr, port[0], hostaddr, port[1], getpid());
|
| 676 |
#endif
|
| 677 |
|
| 678 |
while (!SYS_server_exit || SYS_child_process_count > 0)
|
| 679 |
{
|
| 680 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 681 |
if (SYS_server_exit && !sd_notify_stopping)
|
| 682 |
{
|
| 683 |
sd_notify(0, "STOPPING=1");
|
| 684 |
sd_notify_stopping = 1;
|
| 685 |
}
|
| 686 |
#endif
|
| 687 |
|
| 688 |
while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
|
| 689 |
{
|
| 690 |
SYS_child_exit = 0;
|
| 691 |
|
| 692 |
pid = waitpid(-1, &ret, WNOHANG);
|
| 693 |
if (pid > 0)
|
| 694 |
{
|
| 695 |
SYS_child_exit = 1; // Retry waitid
|
| 696 |
SYS_child_process_count--;
|
| 697 |
|
| 698 |
if (WIFEXITED(ret))
|
| 699 |
{
|
| 700 |
log_common("Child process (%d) exited, status=%d\n", pid, WEXITSTATUS(ret));
|
| 701 |
}
|
| 702 |
else if (WIFSIGNALED(ret))
|
| 703 |
{
|
| 704 |
log_common("Child process (%d) is killed, status=%d\n", pid, WTERMSIG(ret));
|
| 705 |
}
|
| 706 |
else
|
| 707 |
{
|
| 708 |
log_common("Child process (%d) exited abnormally, status=%d\n", pid, ret);
|
| 709 |
}
|
| 710 |
|
| 711 |
if (pid != section_list_loader_pid)
|
| 712 |
{
|
| 713 |
int64_t j = 0;
|
| 714 |
ret = hash_dict_get(hash_dict_pid_sockaddr, (uint64_t)pid, &j);
|
| 715 |
if (ret < 0)
|
| 716 |
{
|
| 717 |
log_error("hash_dict_get(hash_dict_pid_sockaddr, %d) error\n", pid);
|
| 718 |
}
|
| 719 |
else
|
| 720 |
{
|
| 721 |
ret = hash_dict_inc(hash_dict_sockaddr_count, (in_addr_t)j, -1);
|
| 722 |
if (ret <= 0)
|
| 723 |
{
|
| 724 |
log_error("hash_dict_inc(hash_dict_sockaddr_count, %lu, -1) error: %d\n", (in_addr_t)j, ret);
|
| 725 |
}
|
| 726 |
|
| 727 |
ret = hash_dict_del(hash_dict_pid_sockaddr, (uint64_t)pid);
|
| 728 |
if (ret < 0)
|
| 729 |
{
|
| 730 |
log_error("hash_dict_del(hash_dict_pid_sockaddr, %lu) error\n", (uint64_t)pid);
|
| 731 |
}
|
| 732 |
}
|
| 733 |
}
|
| 734 |
}
|
| 735 |
else if (pid == 0)
|
| 736 |
{
|
| 737 |
break;
|
| 738 |
}
|
| 739 |
else if (pid < 0)
|
| 740 |
{
|
| 741 |
log_error("Error in waitpid(): %d\n", errno);
|
| 742 |
break;
|
| 743 |
}
|
| 744 |
}
|
| 745 |
|
| 746 |
if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
|
| 747 |
{
|
| 748 |
if (notify_child_exit == 0)
|
| 749 |
{
|
| 750 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 751 |
sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count);
|
| 752 |
log_common("Notify %d child process to exit\n", SYS_child_process_count);
|
| 753 |
#endif
|
| 754 |
|
| 755 |
if (kill(0, SIGTERM) < 0)
|
| 756 |
{
|
| 757 |
log_error("Send SIGTERM signal failed (%d)\n", errno);
|
| 758 |
}
|
| 759 |
|
| 760 |
notify_child_exit = 1;
|
| 761 |
tm_notify_child_exit = time(NULL);
|
| 762 |
}
|
| 763 |
else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT)
|
| 764 |
{
|
| 765 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 766 |
sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count);
|
| 767 |
#endif
|
| 768 |
|
| 769 |
if (kill(0, SIGKILL) < 0)
|
| 770 |
{
|
| 771 |
log_error("Send SIGKILL signal failed (%d)\n", errno);
|
| 772 |
}
|
| 773 |
|
| 774 |
notify_child_exit = 2;
|
| 775 |
tm_notify_child_exit = time(NULL);
|
| 776 |
}
|
| 777 |
else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT)
|
| 778 |
{
|
| 779 |
log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count);
|
| 780 |
SYS_child_process_count = 0;
|
| 781 |
}
|
| 782 |
}
|
| 783 |
|
| 784 |
if (SYS_conf_reload && !SYS_server_exit)
|
| 785 |
{
|
| 786 |
SYS_conf_reload = 0;
|
| 787 |
|
| 788 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 789 |
sd_notify(0, "RELOADING=1");
|
| 790 |
#endif
|
| 791 |
|
| 792 |
log_common("Reload configuration\n");
|
| 793 |
|
| 794 |
// Restart log
|
| 795 |
if (log_restart() < 0)
|
| 796 |
{
|
| 797 |
log_error("Restart logging failed\n");
|
| 798 |
}
|
| 799 |
|
| 800 |
// Reload configuration
|
| 801 |
if (load_conf(CONF_BBSD) < 0)
|
| 802 |
{
|
| 803 |
log_error("Reload conf failed\n");
|
| 804 |
}
|
| 805 |
|
| 806 |
// Reload BWF config
|
| 807 |
if (bwf_load(CONF_BWF) < 0)
|
| 808 |
{
|
| 809 |
log_error("Reload BWF conf failed\n");
|
| 810 |
}
|
| 811 |
|
| 812 |
// Get EULA modification tm
|
| 813 |
if (stat(DATA_EULA, &file_stat) == -1)
|
| 814 |
{
|
| 815 |
log_error("stat(%s) error\n", DATA_EULA, errno);
|
| 816 |
}
|
| 817 |
else
|
| 818 |
{
|
| 819 |
BBS_eula_tm = file_stat.st_mtim.tv_sec;
|
| 820 |
}
|
| 821 |
|
| 822 |
if (detach_menu_shm(&bbs_menu) < 0)
|
| 823 |
{
|
| 824 |
log_error("detach_menu_shm(bbs_menu) error\n");
|
| 825 |
}
|
| 826 |
if (load_menu(&bbs_menu, CONF_MENU) < 0)
|
| 827 |
{
|
| 828 |
log_error("load_menu(bbs_menu) error\n");
|
| 829 |
unload_menu(&bbs_menu);
|
| 830 |
}
|
| 831 |
|
| 832 |
if (detach_menu_shm(&top10_menu) < 0)
|
| 833 |
{
|
| 834 |
log_error("detach_menu_shm(top10_menu) error\n");
|
| 835 |
}
|
| 836 |
if (load_menu(&top10_menu, CONF_TOP10_MENU) < 0)
|
| 837 |
{
|
| 838 |
log_error("load_menu(top10_menu) error\n");
|
| 839 |
unload_menu(&top10_menu);
|
| 840 |
}
|
| 841 |
top10_menu.allow_exit = 1;
|
| 842 |
|
| 843 |
for (int i = 0; i < data_files_load_startup_count; i++)
|
| 844 |
{
|
| 845 |
if (load_file(data_files_load_startup[i]) < 0)
|
| 846 |
{
|
| 847 |
log_error("load_file(%s) error\n", data_files_load_startup[i]);
|
| 848 |
}
|
| 849 |
}
|
| 850 |
|
| 851 |
// Load section config and gen_ex
|
| 852 |
if (load_section_config_from_db(1) < 0)
|
| 853 |
{
|
| 854 |
log_error("load_section_config_from_db(1) error\n");
|
| 855 |
}
|
| 856 |
|
| 857 |
// Notify child processes to reload configuration
|
| 858 |
if (kill(0, SIGUSR1) < 0)
|
| 859 |
{
|
| 860 |
log_error("Send SIGUSR1 signal failed (%d)\n", errno);
|
| 861 |
}
|
| 862 |
|
| 863 |
#ifdef HAVE_SYSTEMD_SD_DAEMON_H
|
| 864 |
sd_notify(0, "READY=1");
|
| 865 |
#endif
|
| 866 |
}
|
| 867 |
|
| 868 |
#ifdef HAVE_SYS_EPOLL_H
|
| 869 |
nfds = epoll_wait(epollfd_server, events, MAX_EVENTS, 100); // 0.1 second
|
| 870 |
ret = nfds;
|
| 871 |
#else
|
| 872 |
pfds[0].fd = socket_server[0];
|
| 873 |
pfds[0].events = POLLIN;
|
| 874 |
pfds[1].fd = socket_server[1];
|
| 875 |
pfds[1].events = POLLIN;
|
| 876 |
nfds = 2;
|
| 877 |
ret = poll(pfds, (nfds_t)nfds, 100); // 0.1 second
|
| 878 |
#endif
|
| 879 |
if (ret < 0)
|
| 880 |
{
|
| 881 |
if (errno != EINTR)
|
| 882 |
{
|
| 883 |
#ifdef HAVE_SYS_EPOLL_H
|
| 884 |
log_error("epoll_wait() error (%d)\n", errno);
|
| 885 |
#else
|
| 886 |
log_error("poll() error (%d)\n", errno);
|
| 887 |
#endif
|
| 888 |
break;
|
| 889 |
}
|
| 890 |
continue;
|
| 891 |
}
|
| 892 |
|
| 893 |
// Stop accept new connection on exit
|
| 894 |
if (SYS_server_exit)
|
| 895 |
{
|
| 896 |
continue;
|
| 897 |
}
|
| 898 |
|
| 899 |
for (int i = 0; i < nfds; i++)
|
| 900 |
{
|
| 901 |
#ifdef HAVE_SYS_EPOLL_H
|
| 902 |
if (events[i].data.fd == socket_server[0] || events[i].data.fd == socket_server[1])
|
| 903 |
#else
|
| 904 |
if ((pfds[i].fd == socket_server[0] || pfds[i].fd == socket_server[1]) && (pfds[i].revents & POLLIN))
|
| 905 |
#endif
|
| 906 |
{
|
| 907 |
#ifdef HAVE_SYS_EPOLL_H
|
| 908 |
SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
|
| 909 |
#else
|
| 910 |
SSH_v2 = (pfds[i].fd == socket_server[1] ? 1 : 0);
|
| 911 |
#endif
|
| 912 |
|
| 913 |
while (!SYS_server_exit) // Accept all incoming connections until error
|
| 914 |
{
|
| 915 |
addrlen = sizeof(sin);
|
| 916 |
socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, (socklen_t *)&addrlen);
|
| 917 |
if (socket_client < 0)
|
| 918 |
{
|
| 919 |
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
| 920 |
{
|
| 921 |
break;
|
| 922 |
}
|
| 923 |
else if (errno == EINTR)
|
| 924 |
{
|
| 925 |
continue;
|
| 926 |
}
|
| 927 |
else
|
| 928 |
{
|
| 929 |
log_error("accept(socket_server) error (%d)\n", errno);
|
| 930 |
break;
|
| 931 |
}
|
| 932 |
}
|
| 933 |
|
| 934 |
strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
|
| 935 |
hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
|
| 936 |
|
| 937 |
port_client = ntohs(sin.sin_port);
|
| 938 |
|
| 939 |
if (SYS_child_process_count - 1 < BBS_max_client)
|
| 940 |
{
|
| 941 |
int64_t j = 0;
|
| 942 |
ret = hash_dict_get(hash_dict_sockaddr_count, sin.sin_addr.s_addr, &j);
|
| 943 |
if (ret < 0)
|
| 944 |
{
|
| 945 |
log_error("hash_dict_get(hash_dict_sockaddr_count, %s) error\n", hostaddr_client);
|
| 946 |
}
|
| 947 |
|
| 948 |
if (j < BBS_max_client_per_ip)
|
| 949 |
{
|
| 950 |
if ((pid = fork_server()) < 0)
|
| 951 |
{
|
| 952 |
log_error("fork_server() error\n");
|
| 953 |
}
|
| 954 |
else if (pid > 0)
|
| 955 |
{
|
| 956 |
ret = hash_dict_set(hash_dict_pid_sockaddr, (uint64_t)pid, sin.sin_addr.s_addr);
|
| 957 |
if (ret < 0)
|
| 958 |
{
|
| 959 |
log_error("hash_dict_set(hash_dict_pid_sockaddr, %lu, %s) error\n", (uint64_t)pid, hostaddr_client);
|
| 960 |
}
|
| 961 |
|
| 962 |
if (j == 0)
|
| 963 |
{
|
| 964 |
// First connection from this IP
|
| 965 |
log_common("Accept %s connection from %s:%d\n",
|
| 966 |
(SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
|
| 967 |
|
| 968 |
ret = hash_dict_set(hash_dict_sockaddr_count, (uint64_t)sin.sin_addr.s_addr, 1);
|
| 969 |
if (ret < 0)
|
| 970 |
{
|
| 971 |
log_error("hash_dict_set(hash_dict_sockaddr_count, %s, 1) error\n", hostaddr_client);
|
| 972 |
}
|
| 973 |
}
|
| 974 |
else
|
| 975 |
{
|
| 976 |
// Increase connection count from this IP
|
| 977 |
log_common("Accept %s connection from %s:%d, already have %d connections\n",
|
| 978 |
(SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client, j);
|
| 979 |
|
| 980 |
ret = hash_dict_inc(hash_dict_sockaddr_count, (uint64_t)sin.sin_addr.s_addr, 1);
|
| 981 |
if (ret <= 0)
|
| 982 |
{
|
| 983 |
log_error("hash_dict_inc(hash_dict_sockaddr_count, %s, 1) error: %d\n", hostaddr_client, ret);
|
| 984 |
}
|
| 985 |
}
|
| 986 |
}
|
| 987 |
}
|
| 988 |
else
|
| 989 |
{
|
| 990 |
log_error("Rejected %s connection from %s:%d over limit per IP (%d >= %d)\n",
|
| 991 |
(SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client, j, BBS_max_client_per_ip);
|
| 992 |
}
|
| 993 |
}
|
| 994 |
else
|
| 995 |
{
|
| 996 |
log_error("Rejected %s connection from %s:%d over limit (%d >= %d)\n",
|
| 997 |
(SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client, SYS_child_process_count - 1, BBS_max_client);
|
| 998 |
}
|
| 999 |
|
| 1000 |
if (close(socket_client) == -1)
|
| 1001 |
{
|
| 1002 |
log_error("close(socket_lient) error (%d)\n", errno);
|
| 1003 |
}
|
| 1004 |
}
|
| 1005 |
}
|
| 1006 |
}
|
| 1007 |
}
|
| 1008 |
|
| 1009 |
#ifdef HAVE_SYS_EPOLL_H
|
| 1010 |
if (close(epollfd_server) < 0)
|
| 1011 |
{
|
| 1012 |
log_error("close(epollfd_server) error (%d)\n");
|
| 1013 |
}
|
| 1014 |
#endif
|
| 1015 |
|
| 1016 |
for (int i = 0; i < 2; i++)
|
| 1017 |
{
|
| 1018 |
if (close(socket_server[i]) == -1)
|
| 1019 |
{
|
| 1020 |
log_error("Close server socket failed\n");
|
| 1021 |
}
|
| 1022 |
}
|
| 1023 |
|
| 1024 |
hash_dict_destroy(hash_dict_pid_sockaddr);
|
| 1025 |
hash_dict_destroy(hash_dict_sockaddr_count);
|
| 1026 |
|
| 1027 |
ssh_bind_free(sshbind);
|
| 1028 |
ssh_finalize();
|
| 1029 |
|
| 1030 |
return 0;
|
| 1031 |
}
|
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