| 1 |
/***************************************************************************
|
| 2 |
net_server.c - description
|
| 3 |
-------------------
|
| 4 |
Copyright : (C) 2004-2025 by Leaflet
|
| 5 |
Email : leaflet@leafok.com
|
| 6 |
***************************************************************************/
|
| 7 |
|
| 8 |
/***************************************************************************
|
| 9 |
* *
|
| 10 |
* This program is free software; you can redistribute it and/or modify *
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| 11 |
* it under the terms of the GNU General Public License as published by *
|
| 12 |
* the Free Software Foundation; either version 3 of the License, or *
|
| 13 |
* (at your option) any later version. *
|
| 14 |
* *
|
| 15 |
***************************************************************************/
|
| 16 |
|
| 17 |
#include "bbs.h"
|
| 18 |
#include "bbs_main.h"
|
| 19 |
#include "common.h"
|
| 20 |
#include "database.h"
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| 21 |
#include "file_loader.h"
|
| 22 |
#include "io.h"
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| 23 |
#include "init.h"
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| 24 |
#include "log.h"
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| 25 |
#include "login.h"
|
| 26 |
#include "menu.h"
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| 27 |
#include "net_server.h"
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| 28 |
#include "section_list.h"
|
| 29 |
#include "section_list_loader.h"
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| 30 |
#include <errno.h>
|
| 31 |
#include <fcntl.h>
|
| 32 |
#include <signal.h>
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| 33 |
#include <stdlib.h>
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| 34 |
#include <string.h>
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| 35 |
#include <unistd.h>
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| 36 |
#include <arpa/inet.h>
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| 37 |
#include <libssh/callbacks.h>
|
| 38 |
#include <libssh/libssh.h>
|
| 39 |
#include <libssh/server.h>
|
| 40 |
#include <netinet/in.h>
|
| 41 |
#include <sys/epoll.h>
|
| 42 |
#include <sys/socket.h>
|
| 43 |
#include <sys/syscall.h>
|
| 44 |
#include <sys/types.h>
|
| 45 |
#include <sys/wait.h>
|
| 46 |
#include <systemd/sd-daemon.h>
|
| 47 |
|
| 48 |
struct process_sockaddr_t
|
| 49 |
{
|
| 50 |
pid_t pid;
|
| 51 |
in_addr_t s_addr;
|
| 52 |
};
|
| 53 |
typedef struct process_sockaddr_t PROCESS_SOCKADDR;
|
| 54 |
|
| 55 |
static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
|
| 56 |
|
| 57 |
#define SSH_AUTH_MAX_DURATION (60 * 1000) // milliseconds
|
| 58 |
|
| 59 |
struct ssl_server_cb_data_t
|
| 60 |
{
|
| 61 |
int tries;
|
| 62 |
int error;
|
| 63 |
};
|
| 64 |
|
| 65 |
static int auth_password(ssh_session session, const char *user,
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| 66 |
const char *password, void *userdata)
|
| 67 |
{
|
| 68 |
struct ssl_server_cb_data_t *p_data = userdata;
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| 69 |
int ret;
|
| 70 |
|
| 71 |
if (strcmp(user, "guest") == 0)
|
| 72 |
{
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| 73 |
ret = load_guest_info();
|
| 74 |
}
|
| 75 |
else
|
| 76 |
{
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| 77 |
ret = check_user(user, password);
|
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}
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| 79 |
|
| 80 |
if (ret == 0)
|
| 81 |
{
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return SSH_AUTH_SUCCESS;
|
| 83 |
}
|
| 84 |
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| 85 |
if ((++(p_data->tries)) >= BBS_login_retry_times)
|
| 86 |
{
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| 87 |
p_data->error = 1;
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}
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| 89 |
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return SSH_AUTH_DENIED;
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}
|
| 92 |
|
| 93 |
static int pty_request(ssh_session session, ssh_channel channel, const char *term,
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| 94 |
int x, int y, int px, int py, void *userdata)
|
| 95 |
{
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| 96 |
return 0;
|
| 97 |
}
|
| 98 |
|
| 99 |
static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
|
| 100 |
{
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| 101 |
return 0;
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| 102 |
}
|
| 103 |
|
| 104 |
static struct ssh_channel_callbacks_struct channel_cb = {
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| 105 |
.channel_pty_request_function = pty_request,
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| 106 |
.channel_shell_request_function = shell_request};
|
| 107 |
|
| 108 |
static ssh_channel new_session_channel(ssh_session session, void *userdata)
|
| 109 |
{
|
| 110 |
if (SSH_channel != NULL)
|
| 111 |
{
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| 112 |
return NULL;
|
| 113 |
}
|
| 114 |
|
| 115 |
SSH_channel = ssh_channel_new(session);
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| 116 |
ssh_callbacks_init(&channel_cb);
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| 117 |
ssh_set_channel_callbacks(SSH_channel, &channel_cb);
|
| 118 |
|
| 119 |
return SSH_channel;
|
| 120 |
}
|
| 121 |
|
| 122 |
static int fork_server(void)
|
| 123 |
{
|
| 124 |
ssh_event event;
|
| 125 |
int pid;
|
| 126 |
int i;
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| 127 |
int ret;
|
| 128 |
|
| 129 |
struct ssl_server_cb_data_t cb_data = {
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| 130 |
.tries = 0,
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| 131 |
.error = 0,
|
| 132 |
};
|
| 133 |
|
| 134 |
struct ssh_server_callbacks_struct cb = {
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| 135 |
.userdata = &cb_data,
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| 136 |
.auth_password_function = auth_password,
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| 137 |
.channel_open_request_session_function = new_session_channel,
|
| 138 |
};
|
| 139 |
|
| 140 |
pid = fork();
|
| 141 |
|
| 142 |
if (pid > 0) // Parent process
|
| 143 |
{
|
| 144 |
SYS_child_process_count++;
|
| 145 |
log_common("Child process (%d) start\n", pid);
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| 146 |
return pid;
|
| 147 |
}
|
| 148 |
else if (pid < 0) // Error
|
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{
|
| 150 |
log_error("fork() error (%d)\n", errno);
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| 151 |
return -1;
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| 152 |
}
|
| 153 |
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// Child process
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| 156 |
if (close(socket_server[0]) == -1 || close(socket_server[1]) == -1)
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{
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log_error("Close server socket failed\n");
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}
|
| 160 |
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| 161 |
SSH_session = ssh_new();
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| 162 |
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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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| 176 |
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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| 182 |
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| 183 |
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 += 100)
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{
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ret = ssh_event_dopoll(event, 100); // 0.1 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;
|
| 193 |
}
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}
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| 195 |
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| 196 |
if (cb_data.error)
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{
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| 198 |
log_error("SSH auth error, tried %d times\n", cb_data.tries);
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goto cleanup;
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| 200 |
}
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}
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| 203 |
// Redirect Input
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close(STDIN_FILENO);
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| 205 |
if (dup2(socket_client, STDIN_FILENO) == -1)
|
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{
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| 207 |
log_error("Redirect stdin to client socket failed\n");
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goto cleanup;
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| 209 |
}
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// Redirect Output
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close(STDOUT_FILENO);
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if (dup2(socket_client, STDOUT_FILENO) == -1)
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{
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log_error("Redirect stdout to client socket failed\n");
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goto cleanup;
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}
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SYS_child_process_count = 0;
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bbs_main();
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cleanup:
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// Child process exit
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SYS_server_exit = 1;
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| 226 |
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if (SSH_v2)
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{
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ssh_channel_free(SSH_channel);
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ssh_disconnect(SSH_session);
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}
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else if (close(socket_client) == -1)
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{
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log_error("Close client socket failed\n");
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}
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ssh_free(SSH_session);
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ssh_finalize();
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// Close Input and Output for client
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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log_common("Process exit normally\n");
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log_end();
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_exit(0);
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return 0;
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}
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| 251 |
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| 252 |
int net_server(const char *hostaddr, in_port_t port[])
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| 253 |
{
|
| 254 |
unsigned int addrlen;
|
| 255 |
int ret;
|
| 256 |
int flags[2];
|
| 257 |
struct sockaddr_in sin;
|
| 258 |
struct epoll_event ev, events[MAX_EVENTS];
|
| 259 |
int nfds, epollfd;
|
| 260 |
siginfo_t siginfo;
|
| 261 |
int sd_notify_stopping = 0;
|
| 262 |
MENU_SET bbs_menu_new;
|
| 263 |
int i, j;
|
| 264 |
pid_t pid;
|
| 265 |
int ssh_log_level = SSH_LOG_NOLOG;
|
| 266 |
|
| 267 |
ssh_init();
|
| 268 |
|
| 269 |
sshbind = ssh_bind_new();
|
| 270 |
|
| 271 |
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
|
| 272 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
|
| 273 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 ||
|
| 274 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 ||
|
| 275 |
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
|
| 276 |
{
|
| 277 |
log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
|
| 278 |
ssh_bind_free(sshbind);
|
| 279 |
return -1;
|
| 280 |
}
|
| 281 |
|
| 282 |
epollfd = epoll_create1(0);
|
| 283 |
if (epollfd < 0)
|
| 284 |
{
|
| 285 |
log_error("epoll_create1() error (%d)\n", errno);
|
| 286 |
return -1;
|
| 287 |
}
|
| 288 |
|
| 289 |
// Server socket
|
| 290 |
for (i = 0; i < 2; i++)
|
| 291 |
{
|
| 292 |
socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
| 293 |
|
| 294 |
if (socket_server[i] < 0)
|
| 295 |
{
|
| 296 |
log_error("Create socket_server error (%d)\n", errno);
|
| 297 |
return -1;
|
| 298 |
}
|
| 299 |
|
| 300 |
sin.sin_family = AF_INET;
|
| 301 |
sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
|
| 302 |
sin.sin_port = htons(port[i]);
|
| 303 |
|
| 304 |
// Reuse address and port
|
| 305 |
flags[i] = 1;
|
| 306 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
|
| 307 |
{
|
| 308 |
log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
|
| 309 |
}
|
| 310 |
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
|
| 311 |
{
|
| 312 |
log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
|
| 313 |
}
|
| 314 |
|
| 315 |
if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
|
| 316 |
{
|
| 317 |
log_error("Bind address %s:%u error (%d)\n",
|
| 318 |
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
|
| 319 |
return -1;
|
| 320 |
}
|
| 321 |
|
| 322 |
if (listen(socket_server[i], 10) < 0)
|
| 323 |
{
|
| 324 |
log_error("Telnet socket listen error (%d)\n", errno);
|
| 325 |
return -1;
|
| 326 |
}
|
| 327 |
|
| 328 |
log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
|
| 329 |
|
| 330 |
ev.events = EPOLLIN;
|
| 331 |
ev.data.fd = socket_server[i];
|
| 332 |
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
|
| 333 |
{
|
| 334 |
log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
|
| 335 |
if (close(epollfd) < 0)
|
| 336 |
{
|
| 337 |
log_error("close(epoll) error (%d)\n");
|
| 338 |
}
|
| 339 |
return -1;
|
| 340 |
}
|
| 341 |
|
| 342 |
flags[i] = fcntl(socket_server[i], F_GETFL, 0);
|
| 343 |
fcntl(socket_server[i], F_SETFL, flags[i] | O_NONBLOCK);
|
| 344 |
}
|
| 345 |
|
| 346 |
// Startup complete
|
| 347 |
sd_notifyf(0, "READY=1\n"
|
| 348 |
"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
|
| 349 |
"MAINPID=%d",
|
| 350 |
hostaddr, port[0], hostaddr, port[1], getpid());
|
| 351 |
|
| 352 |
while (!SYS_server_exit || SYS_child_process_count > 0)
|
| 353 |
{
|
| 354 |
if (SYS_server_exit && !sd_notify_stopping)
|
| 355 |
{
|
| 356 |
sd_notify(0, "STOPPING=1");
|
| 357 |
sd_notify_stopping = 1;
|
| 358 |
}
|
| 359 |
|
| 360 |
while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
|
| 361 |
{
|
| 362 |
SYS_child_exit = 0;
|
| 363 |
|
| 364 |
siginfo.si_pid = 0;
|
| 365 |
ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
|
| 366 |
if (ret == 0 && siginfo.si_pid > 0)
|
| 367 |
{
|
| 368 |
SYS_child_exit = 1; // Retry waitid
|
| 369 |
|
| 370 |
SYS_child_process_count--;
|
| 371 |
log_common("Child process (%d) exited\n", siginfo.si_pid);
|
| 372 |
|
| 373 |
if (siginfo.si_pid != section_list_loader_pid)
|
| 374 |
{
|
| 375 |
i = 0;
|
| 376 |
for (; i < BBS_max_client; i++)
|
| 377 |
{
|
| 378 |
if (process_sockaddr_pool[i].pid == siginfo.si_pid)
|
| 379 |
{
|
| 380 |
process_sockaddr_pool[i].pid = 0;
|
| 381 |
break;
|
| 382 |
}
|
| 383 |
}
|
| 384 |
if (i >= BBS_max_client)
|
| 385 |
{
|
| 386 |
log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
|
| 387 |
}
|
| 388 |
}
|
| 389 |
}
|
| 390 |
else if (ret == 0)
|
| 391 |
{
|
| 392 |
break;
|
| 393 |
}
|
| 394 |
else if (ret < 0)
|
| 395 |
{
|
| 396 |
log_error("Error in waitid: %d\n", errno);
|
| 397 |
break;
|
| 398 |
}
|
| 399 |
}
|
| 400 |
|
| 401 |
if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
|
| 402 |
{
|
| 403 |
log_common("Notify %d child process to exit\n", SYS_child_process_count);
|
| 404 |
if (kill(0, SIGTERM) < 0)
|
| 405 |
{
|
| 406 |
log_error("Send SIGTERM signal failed (%d)\n", errno);
|
| 407 |
}
|
| 408 |
|
| 409 |
sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
|
| 410 |
|
| 411 |
sleep(1); // Sleep for a while to avoid notifying child processes too frequently
|
| 412 |
}
|
| 413 |
|
| 414 |
if (SYS_conf_reload && !SYS_server_exit)
|
| 415 |
{
|
| 416 |
SYS_conf_reload = 0;
|
| 417 |
sd_notify(0, "RELOADING=1");
|
| 418 |
|
| 419 |
// Reload configuration
|
| 420 |
if (load_conf(CONF_BBSD) < 0)
|
| 421 |
{
|
| 422 |
log_error("Reload conf failed\n");
|
| 423 |
}
|
| 424 |
|
| 425 |
if (load_menu(&bbs_menu_new, CONF_MENU) < 0)
|
| 426 |
{
|
| 427 |
unload_menu(&bbs_menu_new);
|
| 428 |
log_error("Reload menu failed\n");
|
| 429 |
}
|
| 430 |
else
|
| 431 |
{
|
| 432 |
unload_menu(&bbs_menu);
|
| 433 |
memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
|
| 434 |
log_common("Reload menu successfully\n");
|
| 435 |
}
|
| 436 |
|
| 437 |
for (int i = 0; i < data_files_load_startup_count; i++)
|
| 438 |
{
|
| 439 |
if (load_file(data_files_load_startup[i]) < 0)
|
| 440 |
{
|
| 441 |
log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
|
| 442 |
}
|
| 443 |
}
|
| 444 |
log_common("Reload data files successfully\n");
|
| 445 |
|
| 446 |
// Load section config and gen_ex
|
| 447 |
if (load_section_config_from_db(1) < 0)
|
| 448 |
{
|
| 449 |
log_error("load_section_config_from_db(1) error\n");
|
| 450 |
}
|
| 451 |
else
|
| 452 |
{
|
| 453 |
log_common("Reload section config and gen_ex successfully\n");
|
| 454 |
}
|
| 455 |
|
| 456 |
sd_notify(0, "READY=1");
|
| 457 |
}
|
| 458 |
|
| 459 |
nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
|
| 460 |
|
| 461 |
if (nfds < 0)
|
| 462 |
{
|
| 463 |
if (errno != EINTR)
|
| 464 |
{
|
| 465 |
log_error("epoll_wait() error (%d)\n", errno);
|
| 466 |
break;
|
| 467 |
}
|
| 468 |
continue;
|
| 469 |
}
|
| 470 |
|
| 471 |
// Stop accept new connection on exit
|
| 472 |
if (SYS_server_exit)
|
| 473 |
{
|
| 474 |
continue;
|
| 475 |
}
|
| 476 |
|
| 477 |
for (int i = 0; i < nfds; i++)
|
| 478 |
{
|
| 479 |
if (events[i].data.fd == socket_server[0] || events[i].data.fd == socket_server[1])
|
| 480 |
{
|
| 481 |
SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
|
| 482 |
|
| 483 |
while (!SYS_server_exit) // Accept all incoming connections until error
|
| 484 |
{
|
| 485 |
addrlen = sizeof(sin);
|
| 486 |
socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
|
| 487 |
if (socket_client < 0)
|
| 488 |
{
|
| 489 |
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
| 490 |
{
|
| 491 |
break;
|
| 492 |
}
|
| 493 |
else if (errno == EINTR)
|
| 494 |
{
|
| 495 |
continue;
|
| 496 |
}
|
| 497 |
else
|
| 498 |
{
|
| 499 |
log_error("accept(socket_server) error (%d)\n", errno);
|
| 500 |
break;
|
| 501 |
}
|
| 502 |
}
|
| 503 |
|
| 504 |
strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
|
| 505 |
hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
|
| 506 |
|
| 507 |
port_client = ntohs(sin.sin_port);
|
| 508 |
|
| 509 |
log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
|
| 510 |
|
| 511 |
if (SYS_child_process_count - 1 < BBS_max_client)
|
| 512 |
{
|
| 513 |
j = 0;
|
| 514 |
for (i = 0; i < BBS_max_client; i++)
|
| 515 |
{
|
| 516 |
if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
|
| 517 |
{
|
| 518 |
j++;
|
| 519 |
if (j >= BBS_max_client_per_ip)
|
| 520 |
{
|
| 521 |
log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
|
| 522 |
break;
|
| 523 |
}
|
| 524 |
}
|
| 525 |
}
|
| 526 |
|
| 527 |
if (j < BBS_max_client_per_ip)
|
| 528 |
{
|
| 529 |
if ((pid = fork_server()) < 0)
|
| 530 |
{
|
| 531 |
log_error("fork_server() error\n");
|
| 532 |
}
|
| 533 |
else if (pid > 0)
|
| 534 |
{
|
| 535 |
i = 0;
|
| 536 |
for (; i < BBS_max_client; i++)
|
| 537 |
{
|
| 538 |
if (process_sockaddr_pool[i].pid == 0)
|
| 539 |
{
|
| 540 |
break;
|
| 541 |
}
|
| 542 |
}
|
| 543 |
|
| 544 |
if (i >= BBS_max_client)
|
| 545 |
{
|
| 546 |
log_error("Process sockaddr pool depleted\n");
|
| 547 |
}
|
| 548 |
else
|
| 549 |
{
|
| 550 |
process_sockaddr_pool[i].pid = pid;
|
| 551 |
process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
|
| 552 |
}
|
| 553 |
}
|
| 554 |
}
|
| 555 |
}
|
| 556 |
else
|
| 557 |
{
|
| 558 |
log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
|
| 559 |
}
|
| 560 |
|
| 561 |
if (close(socket_client) == -1)
|
| 562 |
{
|
| 563 |
log_error("close(socket_lient) error (%d)\n", errno);
|
| 564 |
}
|
| 565 |
}
|
| 566 |
}
|
| 567 |
}
|
| 568 |
}
|
| 569 |
|
| 570 |
if (close(epollfd) < 0)
|
| 571 |
{
|
| 572 |
log_error("close(epoll) error (%d)\n");
|
| 573 |
}
|
| 574 |
|
| 575 |
for (i = 0; i < 2; i++)
|
| 576 |
{
|
| 577 |
fcntl(socket_server[i], F_SETFL, flags[i]);
|
| 578 |
|
| 579 |
if (close(socket_server[i]) == -1)
|
| 580 |
{
|
| 581 |
log_error("Close server socket failed\n");
|
| 582 |
}
|
| 583 |
}
|
| 584 |
|
| 585 |
ssh_bind_free(sshbind);
|
| 586 |
ssh_finalize();
|
| 587 |
|
| 588 |
return 0;
|
| 589 |
}
|
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