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/*************************************************************************** |
/* SPDX-License-Identifier: GPL-3.0-or-later */ |
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net_server.c - description |
/* |
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------------------- |
* net_server |
| 4 |
Copyright : (C) 2004-2025 by Leaflet |
* - network server with SSH support |
| 5 |
Email : leaflet@leafok.com |
* |
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***************************************************************************/ |
* Copyright (C) 2004-2025 by Leaflet <leaflet@leafok.com> |
| 7 |
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*/ |
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/*************************************************************************** |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 3 of the License, or * |
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* (at your option) any later version. * |
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* * |
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***************************************************************************/ |
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#define _XOPEN_SOURCE 500 |
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#define _POSIX_C_SOURCE 200809L |
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#define _GNU_SOURCE |
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| 9 |
#include "net_server.h" |
#include "bbs.h" |
| 10 |
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#include "bbs_main.h" |
| 11 |
#include "common.h" |
#include "common.h" |
| 12 |
#include "log.h" |
#include "database.h" |
| 13 |
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#include "file_loader.h" |
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#include "io.h" |
#include "io.h" |
| 15 |
#include "fork.h" |
#include "init.h" |
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#include "log.h" |
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#include "login.h" |
| 18 |
#include "menu.h" |
#include "menu.h" |
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#include "net_server.h" |
| 20 |
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#include "section_list.h" |
| 21 |
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#include "section_list_loader.h" |
| 22 |
#include <errno.h> |
#include <errno.h> |
| 23 |
#include <fcntl.h> |
#include <fcntl.h> |
| 24 |
#include <string.h> |
#include <pty.h> |
| 25 |
#include <signal.h> |
#include <signal.h> |
| 26 |
#include <stdlib.h> |
#include <stdlib.h> |
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#include <string.h> |
| 28 |
#include <unistd.h> |
#include <unistd.h> |
| 29 |
#include <sys/syscall.h> |
#include <utmp.h> |
| 30 |
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#include <arpa/inet.h> |
| 31 |
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#include <libssh/callbacks.h> |
| 32 |
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#include <libssh/libssh.h> |
| 33 |
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#include <libssh/server.h> |
| 34 |
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#include <netinet/in.h> |
| 35 |
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#include <sys/epoll.h> |
| 36 |
#include <sys/socket.h> |
#include <sys/socket.h> |
| 37 |
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#include <sys/syscall.h> |
| 38 |
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#include <sys/types.h> |
| 39 |
#include <sys/wait.h> |
#include <sys/wait.h> |
| 40 |
#include <arpa/inet.h> |
#include <systemd/sd-daemon.h> |
| 41 |
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| 42 |
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#define WAIT_CHILD_PROCESS_EXIT_TIMEOUT 5 // second |
| 43 |
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#define WAIT_CHILD_PROCESS_KILL_TIMEOUT 1 // second |
| 44 |
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| 45 |
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struct process_sockaddr_t |
| 46 |
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{ |
| 47 |
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pid_t pid; |
| 48 |
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in_addr_t s_addr; |
| 49 |
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}; |
| 50 |
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typedef struct process_sockaddr_t PROCESS_SOCKADDR; |
| 51 |
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| 52 |
int net_server(const char *hostaddr, in_port_t port) |
static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT]; |
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| 54 |
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#define SSH_AUTH_MAX_DURATION (60 * 1000) // milliseconds |
| 55 |
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| 56 |
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#define SFTP_SERVER_PATH "/usr/lib/sftp-server" |
| 57 |
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| 58 |
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/* A userdata struct for session. */ |
| 59 |
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struct session_data_struct |
| 60 |
{ |
{ |
| 61 |
unsigned int namelen; |
int tries; |
| 62 |
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int error; |
| 63 |
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}; |
| 64 |
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| 65 |
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/* A userdata struct for channel. */ |
| 66 |
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struct channel_data_struct |
| 67 |
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{ |
| 68 |
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/* pid of the child process the channel will spawn. */ |
| 69 |
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pid_t pid; |
| 70 |
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/* For PTY allocation */ |
| 71 |
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socket_t pty_master; |
| 72 |
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socket_t pty_slave; |
| 73 |
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/* For communication with the child process. */ |
| 74 |
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socket_t child_stdin; |
| 75 |
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socket_t child_stdout; |
| 76 |
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/* Only used for subsystem and exec requests. */ |
| 77 |
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socket_t child_stderr; |
| 78 |
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/* Event which is used to poll the above descriptors. */ |
| 79 |
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ssh_event event; |
| 80 |
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/* Terminal size struct. */ |
| 81 |
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struct winsize *winsize; |
| 82 |
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}; |
| 83 |
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| 84 |
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static int auth_password(ssh_session session, const char *user, |
| 85 |
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const char *password, void *userdata) |
| 86 |
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{ |
| 87 |
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struct session_data_struct *sdata = (struct session_data_struct *)userdata; |
| 88 |
int ret; |
int ret; |
|
int flags; |
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struct sockaddr_in sin; |
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fd_set testfds; |
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struct timeval timeout; |
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sigset_t nsigset; |
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sigset_t osigset; |
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siginfo_t siginfo; |
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| 89 |
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| 90 |
socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
if (strcmp(user, "guest") == 0) |
| 91 |
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{ |
| 92 |
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ret = load_guest_info(); |
| 93 |
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} |
| 94 |
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else |
| 95 |
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{ |
| 96 |
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ret = check_user(user, password); |
| 97 |
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} |
| 98 |
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| 99 |
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if (ret == 0) |
| 100 |
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{ |
| 101 |
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return SSH_AUTH_SUCCESS; |
| 102 |
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} |
| 103 |
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| 104 |
if (socket_server < 0) |
if ((++(sdata->tries)) >= BBS_login_retry_times) |
| 105 |
{ |
{ |
| 106 |
log_error("Create socket failed\n"); |
sdata->error = 1; |
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exit(1); |
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| 107 |
} |
} |
| 108 |
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| 109 |
sin.sin_family = AF_INET; |
return SSH_AUTH_DENIED; |
| 110 |
sin.sin_addr.s_addr = |
} |
| 111 |
(strnlen(hostaddr, sizeof(hostaddr)) > 0 ? inet_addr(hostaddr) : INADDR_ANY); |
|
| 112 |
sin.sin_port = htons(port); |
static int pty_request(ssh_session session, ssh_channel channel, const char *term, |
| 113 |
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int cols, int rows, int px, int py, void *userdata) |
| 114 |
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{ |
| 115 |
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata; |
| 116 |
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int rc; |
| 117 |
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| 118 |
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(void)session; |
| 119 |
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(void)channel; |
| 120 |
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(void)term; |
| 121 |
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| 122 |
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cdata->winsize->ws_row = (unsigned short int)rows; |
| 123 |
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cdata->winsize->ws_col = (unsigned short int)cols; |
| 124 |
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cdata->winsize->ws_xpixel = (unsigned short int)px; |
| 125 |
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cdata->winsize->ws_ypixel = (unsigned short int)py; |
| 126 |
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| 127 |
if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0) |
rc = openpty(&cdata->pty_master, &cdata->pty_slave, NULL, NULL, cdata->winsize); |
| 128 |
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if (rc != 0) |
| 129 |
{ |
{ |
| 130 |
log_error("Bind address %s:%u failed\n", |
log_error("Failed to open pty\n"); |
| 131 |
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port)); |
return SSH_ERROR; |
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exit(2); |
|
| 132 |
} |
} |
| 133 |
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|
| 134 |
if (listen(socket_server, 10) < 0) |
return SSH_OK; |
| 135 |
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} |
| 136 |
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| 137 |
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static int pty_resize(ssh_session session, ssh_channel channel, int cols, int rows, |
| 138 |
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int py, int px, void *userdata) |
| 139 |
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{ |
| 140 |
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata; |
| 141 |
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|
| 142 |
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(void)session; |
| 143 |
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(void)channel; |
| 144 |
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|
| 145 |
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cdata->winsize->ws_row = (unsigned short int)rows; |
| 146 |
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cdata->winsize->ws_col = (unsigned short int)cols; |
| 147 |
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cdata->winsize->ws_xpixel = (unsigned short int)px; |
| 148 |
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cdata->winsize->ws_ypixel = (unsigned short int)py; |
| 149 |
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| 150 |
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if (cdata->pty_master != -1) |
| 151 |
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{ |
| 152 |
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return ioctl(cdata->pty_master, TIOCSWINSZ, cdata->winsize); |
| 153 |
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} |
| 154 |
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| 155 |
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return SSH_ERROR; |
| 156 |
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} |
| 157 |
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| 158 |
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static int exec_pty(const char *mode, const char *command, struct channel_data_struct *cdata) |
| 159 |
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{ |
| 160 |
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(void)cdata; |
| 161 |
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| 162 |
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if (command != NULL) |
| 163 |
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{ |
| 164 |
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log_error("Forbid exec /bin/sh %s %s)\n", mode, command); |
| 165 |
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} |
| 166 |
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| 167 |
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return SSH_OK; |
| 168 |
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} |
| 169 |
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| 170 |
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static int exec_nopty(const char *command, struct channel_data_struct *cdata) |
| 171 |
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{ |
| 172 |
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(void)cdata; |
| 173 |
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| 174 |
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if (command != NULL) |
| 175 |
{ |
{ |
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log_error("Socket listen failed\n"); |
log_error("Forbid exec /bin/sh -c %s)\n", command); |
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exit(3); |
|
| 177 |
} |
} |
| 178 |
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| 179 |
strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1); |
return SSH_OK; |
| 180 |
hostaddr_server[sizeof(hostaddr_server) - 1] = '\0'; |
} |
| 181 |
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| 182 |
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static int exec_request(ssh_session session, ssh_channel channel, const char *command, void *userdata) |
| 183 |
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{ |
| 184 |
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata; |
| 185 |
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| 186 |
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(void)session; |
| 187 |
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(void)channel; |
| 188 |
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| 189 |
port_server = ntohs(sin.sin_port); |
if (cdata->pid > 0) |
| 190 |
namelen = sizeof(sin); |
{ |
| 191 |
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return SSH_ERROR; |
| 192 |
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} |
| 193 |
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| 194 |
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if (cdata->pty_master != -1 && cdata->pty_slave != -1) |
| 195 |
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{ |
| 196 |
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return exec_pty("-c", command, cdata); |
| 197 |
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} |
| 198 |
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return exec_nopty(command, cdata); |
| 199 |
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} |
| 200 |
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| 201 |
log_std("Listening at %s:%d\n", hostaddr_server, port_server); |
static int shell_request(ssh_session session, ssh_channel channel, void *userdata) |
| 202 |
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{ |
| 203 |
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struct channel_data_struct *cdata = (struct channel_data_struct *)userdata; |
| 204 |
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|
| 205 |
sigemptyset(&nsigset); |
(void)session; |
| 206 |
sigaddset(&nsigset, SIGHUP); |
(void)channel; |
| 207 |
sigaddset(&nsigset, SIGCHLD); |
|
| 208 |
sigaddset(&nsigset, SIGTERM); |
if (cdata->pid > 0) |
| 209 |
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{ |
| 210 |
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return SSH_ERROR; |
| 211 |
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} |
| 212 |
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|
| 213 |
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if (cdata->pty_master != -1 && cdata->pty_slave != -1) |
| 214 |
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{ |
| 215 |
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return exec_pty("-l", NULL, cdata); |
| 216 |
|
} |
| 217 |
|
/* Client requested a shell without a pty, let's pretend we allow that */ |
| 218 |
|
return SSH_OK; |
| 219 |
|
} |
| 220 |
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|
| 221 |
|
static int subsystem_request(ssh_session session, ssh_channel channel, const char *subsystem, void *userdata) |
| 222 |
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{ |
| 223 |
|
(void)session; |
| 224 |
|
(void)channel; |
| 225 |
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|
| 226 |
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log_error("subsystem_request(subsystem=%s)\n", subsystem); |
| 227 |
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|
| 228 |
|
/* subsystem requests behave similarly to exec requests. */ |
| 229 |
|
if (strcmp(subsystem, "sftp") == 0) |
| 230 |
|
{ |
| 231 |
|
return exec_request(session, channel, SFTP_SERVER_PATH, userdata); |
| 232 |
|
} |
| 233 |
|
return SSH_ERROR; |
| 234 |
|
} |
| 235 |
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|
| 236 |
|
static ssh_channel channel_open(ssh_session session, void *userdata) |
| 237 |
|
{ |
| 238 |
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(void)userdata; |
| 239 |
|
|
| 240 |
|
if (SSH_channel != NULL) |
| 241 |
|
{ |
| 242 |
|
return NULL; |
| 243 |
|
} |
| 244 |
|
|
| 245 |
|
SSH_channel = ssh_channel_new(session); |
| 246 |
|
|
| 247 |
|
return SSH_channel; |
| 248 |
|
} |
| 249 |
|
|
| 250 |
|
static int fork_server(void) |
| 251 |
|
{ |
| 252 |
|
ssh_event event; |
| 253 |
|
long int ssh_timeout = 0; |
| 254 |
|
int pid; |
| 255 |
|
int i; |
| 256 |
|
int ret; |
| 257 |
|
|
| 258 |
|
/* Structure for storing the pty size. */ |
| 259 |
|
struct winsize wsize = { |
| 260 |
|
.ws_row = 0, |
| 261 |
|
.ws_col = 0, |
| 262 |
|
.ws_xpixel = 0, |
| 263 |
|
.ws_ypixel = 0}; |
| 264 |
|
|
| 265 |
|
/* Our struct holding information about the channel. */ |
| 266 |
|
struct channel_data_struct cdata = { |
| 267 |
|
.pid = 0, |
| 268 |
|
.pty_master = -1, |
| 269 |
|
.pty_slave = -1, |
| 270 |
|
.child_stdin = -1, |
| 271 |
|
.child_stdout = -1, |
| 272 |
|
.child_stderr = -1, |
| 273 |
|
.event = NULL, |
| 274 |
|
.winsize = &wsize}; |
| 275 |
|
|
| 276 |
|
struct session_data_struct cb_data = { |
| 277 |
|
.tries = 0, |
| 278 |
|
.error = 0, |
| 279 |
|
}; |
| 280 |
|
|
| 281 |
|
struct ssh_channel_callbacks_struct channel_cb = { |
| 282 |
|
.userdata = &cdata, |
| 283 |
|
.channel_pty_request_function = pty_request, |
| 284 |
|
.channel_pty_window_change_function = pty_resize, |
| 285 |
|
.channel_shell_request_function = shell_request, |
| 286 |
|
.channel_exec_request_function = exec_request, |
| 287 |
|
.channel_subsystem_request_function = subsystem_request}; |
| 288 |
|
|
| 289 |
|
struct ssh_server_callbacks_struct server_cb = { |
| 290 |
|
.userdata = &cb_data, |
| 291 |
|
.auth_password_function = auth_password, |
| 292 |
|
.channel_open_request_session_function = channel_open, |
| 293 |
|
}; |
| 294 |
|
|
| 295 |
|
pid = fork(); |
| 296 |
|
|
| 297 |
|
if (pid > 0) // Parent process |
| 298 |
|
{ |
| 299 |
|
SYS_child_process_count++; |
| 300 |
|
log_common("Child process (%d) start\n", pid); |
| 301 |
|
return pid; |
| 302 |
|
} |
| 303 |
|
else if (pid < 0) // Error |
| 304 |
|
{ |
| 305 |
|
log_error("fork() error (%d)\n", errno); |
| 306 |
|
return -1; |
| 307 |
|
} |
| 308 |
|
|
| 309 |
|
// Child process |
| 310 |
|
|
| 311 |
|
if (close(socket_server[0]) == -1 || close(socket_server[1]) == -1) |
| 312 |
|
{ |
| 313 |
|
log_error("Close server socket failed\n"); |
| 314 |
|
} |
| 315 |
|
|
| 316 |
|
SSH_session = ssh_new(); |
| 317 |
|
|
| 318 |
|
if (SSH_v2) |
| 319 |
|
{ |
| 320 |
|
if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK) |
| 321 |
|
{ |
| 322 |
|
log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session)); |
| 323 |
|
goto cleanup; |
| 324 |
|
} |
| 325 |
|
|
| 326 |
|
ssh_bind_free(sshbind); |
| 327 |
|
|
| 328 |
|
ssh_timeout = 60; // second |
| 329 |
|
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0) |
| 330 |
|
{ |
| 331 |
|
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session)); |
| 332 |
|
goto cleanup; |
| 333 |
|
} |
| 334 |
|
|
| 335 |
|
ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD); |
| 336 |
|
|
| 337 |
|
ssh_callbacks_init(&server_cb); |
| 338 |
|
ssh_callbacks_init(&channel_cb); |
| 339 |
|
|
| 340 |
|
ssh_set_server_callbacks(SSH_session, &server_cb); |
| 341 |
|
|
| 342 |
|
if (ssh_handle_key_exchange(SSH_session)) |
| 343 |
|
{ |
| 344 |
|
log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session)); |
| 345 |
|
goto cleanup; |
| 346 |
|
} |
| 347 |
|
|
| 348 |
|
event = ssh_event_new(); |
| 349 |
|
ssh_event_add_session(event, SSH_session); |
| 350 |
|
|
| 351 |
|
for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100) |
| 352 |
|
{ |
| 353 |
|
ret = ssh_event_dopoll(event, 100); // 0.1 second |
| 354 |
|
if (ret == SSH_ERROR) |
| 355 |
|
{ |
| 356 |
|
#ifdef _DEBUG |
| 357 |
|
log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session)); |
| 358 |
|
#endif |
| 359 |
|
goto cleanup; |
| 360 |
|
} |
| 361 |
|
} |
| 362 |
|
|
| 363 |
|
if (cb_data.error) |
| 364 |
|
{ |
| 365 |
|
log_error("SSH auth error, tried %d times\n", cb_data.tries); |
| 366 |
|
goto cleanup; |
| 367 |
|
} |
| 368 |
|
|
| 369 |
|
ssh_set_channel_callbacks(SSH_channel, &channel_cb); |
| 370 |
|
|
| 371 |
|
do |
| 372 |
|
{ |
| 373 |
|
ret = ssh_event_dopoll(event, 100); // 0.1 second |
| 374 |
|
if (ret == SSH_ERROR) |
| 375 |
|
{ |
| 376 |
|
ssh_channel_close(SSH_channel); |
| 377 |
|
} |
| 378 |
|
|
| 379 |
|
if (ret == SSH_AGAIN) // loop until SSH connection is fully established |
| 380 |
|
{ |
| 381 |
|
/* Executed only once, once the child process starts. */ |
| 382 |
|
cdata.event = event; |
| 383 |
|
break; |
| 384 |
|
} |
| 385 |
|
} while (ssh_channel_is_open(SSH_channel)); |
| 386 |
|
|
| 387 |
|
ssh_timeout = 0; |
| 388 |
|
if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0) |
| 389 |
|
{ |
| 390 |
|
log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session)); |
| 391 |
|
goto cleanup; |
| 392 |
|
} |
| 393 |
|
} |
| 394 |
|
|
| 395 |
|
// Redirect Input |
| 396 |
|
close(STDIN_FILENO); |
| 397 |
|
if (dup2(socket_client, STDIN_FILENO) == -1) |
| 398 |
|
{ |
| 399 |
|
log_error("Redirect stdin to client socket failed\n"); |
| 400 |
|
goto cleanup; |
| 401 |
|
} |
| 402 |
|
|
| 403 |
|
// Redirect Output |
| 404 |
|
close(STDOUT_FILENO); |
| 405 |
|
if (dup2(socket_client, STDOUT_FILENO) == -1) |
| 406 |
|
{ |
| 407 |
|
log_error("Redirect stdout to client socket failed\n"); |
| 408 |
|
goto cleanup; |
| 409 |
|
} |
| 410 |
|
|
| 411 |
|
SYS_child_process_count = 0; |
| 412 |
|
|
| 413 |
|
bbs_main(); |
| 414 |
|
|
| 415 |
|
cleanup: |
| 416 |
|
// Child process exit |
| 417 |
|
SYS_server_exit = 1; |
| 418 |
|
|
| 419 |
|
if (SSH_v2) |
| 420 |
|
{ |
| 421 |
|
close(cdata.pty_master); |
| 422 |
|
close(cdata.child_stdin); |
| 423 |
|
close(cdata.child_stdout); |
| 424 |
|
close(cdata.child_stderr); |
| 425 |
|
|
| 426 |
|
ssh_channel_free(SSH_channel); |
| 427 |
|
ssh_disconnect(SSH_session); |
| 428 |
|
} |
| 429 |
|
else if (close(socket_client) == -1) |
| 430 |
|
{ |
| 431 |
|
log_error("Close client socket failed\n"); |
| 432 |
|
} |
| 433 |
|
|
| 434 |
|
ssh_free(SSH_session); |
| 435 |
|
ssh_finalize(); |
| 436 |
|
|
| 437 |
|
// Close Input and Output for client |
| 438 |
|
close(STDIN_FILENO); |
| 439 |
|
close(STDOUT_FILENO); |
| 440 |
|
|
| 441 |
|
log_common("Process exit normally\n"); |
| 442 |
|
log_end(); |
| 443 |
|
|
| 444 |
|
_exit(0); |
| 445 |
|
|
| 446 |
|
return 0; |
| 447 |
|
} |
| 448 |
|
|
| 449 |
|
int net_server(const char *hostaddr, in_port_t port[]) |
| 450 |
|
{ |
| 451 |
|
unsigned int addrlen; |
| 452 |
|
int ret; |
| 453 |
|
int flags[2]; |
| 454 |
|
struct sockaddr_in sin; |
| 455 |
|
struct epoll_event ev, events[MAX_EVENTS]; |
| 456 |
|
int nfds, epollfd; |
| 457 |
|
siginfo_t siginfo; |
| 458 |
|
int notify_child_exit = 0; |
| 459 |
|
time_t tm_notify_child_exit = time(NULL); |
| 460 |
|
int sd_notify_stopping = 0; |
| 461 |
|
MENU_SET bbs_menu_new; |
| 462 |
|
MENU_SET top10_menu_new; |
| 463 |
|
int i, j; |
| 464 |
|
pid_t pid; |
| 465 |
|
int ssh_log_level = SSH_LOG_NOLOG; |
| 466 |
|
|
| 467 |
|
ssh_init(); |
| 468 |
|
|
| 469 |
|
sshbind = ssh_bind_new(); |
| 470 |
|
|
| 471 |
|
if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 || |
| 472 |
|
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 || |
| 473 |
|
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 || |
| 474 |
|
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 || |
| 475 |
|
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0) |
| 476 |
|
{ |
| 477 |
|
log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind)); |
| 478 |
|
ssh_bind_free(sshbind); |
| 479 |
|
return -1; |
| 480 |
|
} |
| 481 |
|
|
| 482 |
|
epollfd = epoll_create1(0); |
| 483 |
|
if (epollfd < 0) |
| 484 |
|
{ |
| 485 |
|
log_error("epoll_create1() error (%d)\n", errno); |
| 486 |
|
return -1; |
| 487 |
|
} |
| 488 |
|
|
| 489 |
|
// Server socket |
| 490 |
|
for (i = 0; i < 2; i++) |
| 491 |
|
{ |
| 492 |
|
socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 493 |
|
|
| 494 |
|
if (socket_server[i] < 0) |
| 495 |
|
{ |
| 496 |
|
log_error("Create socket_server error (%d)\n", errno); |
| 497 |
|
return -1; |
| 498 |
|
} |
| 499 |
|
|
| 500 |
|
sin.sin_family = AF_INET; |
| 501 |
|
sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY); |
| 502 |
|
sin.sin_port = htons(port[i]); |
| 503 |
|
|
| 504 |
|
// Reuse address and port |
| 505 |
|
flags[i] = 1; |
| 506 |
|
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0) |
| 507 |
|
{ |
| 508 |
|
log_error("setsockopt SO_REUSEADDR error (%d)\n", errno); |
| 509 |
|
} |
| 510 |
|
if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0) |
| 511 |
|
{ |
| 512 |
|
log_error("setsockopt SO_REUSEPORT error (%d)\n", errno); |
| 513 |
|
} |
| 514 |
|
|
| 515 |
|
if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0) |
| 516 |
|
{ |
| 517 |
|
log_error("Bind address %s:%u error (%d)\n", |
| 518 |
|
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno); |
| 519 |
|
return -1; |
| 520 |
|
} |
| 521 |
|
|
| 522 |
|
if (listen(socket_server[i], 10) < 0) |
| 523 |
|
{ |
| 524 |
|
log_error("Telnet socket listen error (%d)\n", errno); |
| 525 |
|
return -1; |
| 526 |
|
} |
| 527 |
|
|
| 528 |
|
log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port)); |
| 529 |
|
|
| 530 |
|
ev.events = EPOLLIN; |
| 531 |
|
ev.data.fd = socket_server[i]; |
| 532 |
|
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1) |
| 533 |
|
{ |
| 534 |
|
log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno); |
| 535 |
|
if (close(epollfd) < 0) |
| 536 |
|
{ |
| 537 |
|
log_error("close(epoll) error (%d)\n"); |
| 538 |
|
} |
| 539 |
|
return -1; |
| 540 |
|
} |
| 541 |
|
|
| 542 |
|
flags[i] = fcntl(socket_server[i], F_GETFL, 0); |
| 543 |
|
fcntl(socket_server[i], F_SETFL, flags[i] | O_NONBLOCK); |
| 544 |
|
} |
| 545 |
|
|
| 546 |
|
// Startup complete |
| 547 |
|
sd_notifyf(0, "READY=1\n" |
| 548 |
|
"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n" |
| 549 |
|
"MAINPID=%d", |
| 550 |
|
hostaddr, port[0], hostaddr, port[1], getpid()); |
| 551 |
|
|
| 552 |
while (!SYS_server_exit || SYS_child_process_count > 0) |
while (!SYS_server_exit || SYS_child_process_count > 0) |
| 553 |
{ |
{ |
| 554 |
sigprocmask(SIG_BLOCK, &nsigset, &osigset); |
if (SYS_server_exit && !sd_notify_stopping) |
| 555 |
|
{ |
| 556 |
|
sd_notify(0, "STOPPING=1"); |
| 557 |
|
sd_notify_stopping = 1; |
| 558 |
|
} |
| 559 |
|
|
| 560 |
while (SYS_child_exit_count > 0) |
while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0) |
| 561 |
{ |
{ |
| 562 |
|
SYS_child_exit = 0; |
| 563 |
|
|
| 564 |
siginfo.si_pid = 0; |
siginfo.si_pid = 0; |
| 565 |
ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG); |
ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG); |
| 566 |
if (ret == 0 && siginfo.si_pid > 0) |
if (ret == 0 && siginfo.si_pid > 0) |
| 567 |
{ |
{ |
| 568 |
SYS_child_exit_count--; |
SYS_child_exit = 1; // Retry waitid |
| 569 |
|
|
| 570 |
SYS_child_process_count--; |
SYS_child_process_count--; |
| 571 |
log_std("Child process (%d) exited\n", siginfo.si_pid); |
log_common("Child process (%d) exited\n", siginfo.si_pid); |
| 572 |
|
|
| 573 |
|
if (siginfo.si_pid != section_list_loader_pid) |
| 574 |
|
{ |
| 575 |
|
i = 0; |
| 576 |
|
for (; i < BBS_max_client; i++) |
| 577 |
|
{ |
| 578 |
|
if (process_sockaddr_pool[i].pid == siginfo.si_pid) |
| 579 |
|
{ |
| 580 |
|
process_sockaddr_pool[i].pid = 0; |
| 581 |
|
break; |
| 582 |
|
} |
| 583 |
|
} |
| 584 |
|
if (i >= BBS_max_client) |
| 585 |
|
{ |
| 586 |
|
log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid); |
| 587 |
|
} |
| 588 |
|
} |
| 589 |
} |
} |
| 590 |
else if (ret == 0) |
else if (ret == 0) |
| 591 |
{ |
{ |
| 598 |
} |
} |
| 599 |
} |
} |
| 600 |
|
|
| 601 |
if (SYS_server_exit && SYS_child_exit_count == 0) |
if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0) |
| 602 |
{ |
{ |
| 603 |
if (kill(0, SIGTERM) < 0) |
if (notify_child_exit == 0) |
| 604 |
|
{ |
| 605 |
|
sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count); |
| 606 |
|
log_common("Notify %d child process to exit\n", SYS_child_process_count); |
| 607 |
|
|
| 608 |
|
if (kill(0, SIGTERM) < 0) |
| 609 |
|
{ |
| 610 |
|
log_error("Send SIGTERM signal failed (%d)\n", errno); |
| 611 |
|
} |
| 612 |
|
|
| 613 |
|
notify_child_exit = 1; |
| 614 |
|
tm_notify_child_exit = time(NULL); |
| 615 |
|
} |
| 616 |
|
else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT) |
| 617 |
|
{ |
| 618 |
|
sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count); |
| 619 |
|
|
| 620 |
|
for (i = 0; i < BBS_max_client; i++) |
| 621 |
|
{ |
| 622 |
|
if (process_sockaddr_pool[i].pid != 0) |
| 623 |
|
{ |
| 624 |
|
log_error("Kill child process (pid=%d)\n", process_sockaddr_pool[i].pid); |
| 625 |
|
if (kill(process_sockaddr_pool[i].pid, SIGKILL) < 0) |
| 626 |
|
{ |
| 627 |
|
log_error("Send SIGKILL signal failed (%d)\n", errno); |
| 628 |
|
} |
| 629 |
|
} |
| 630 |
|
} |
| 631 |
|
|
| 632 |
|
notify_child_exit = 2; |
| 633 |
|
tm_notify_child_exit = time(NULL); |
| 634 |
|
} |
| 635 |
|
else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT) |
| 636 |
{ |
{ |
| 637 |
log_error("Send SIGTERM signal failed (%d)\n", errno); |
log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count); |
| 638 |
|
SYS_child_process_count = 0; |
| 639 |
} |
} |
| 640 |
} |
} |
| 641 |
|
|
| 642 |
if (SYS_menu_reload && !SYS_server_exit) |
if (SYS_conf_reload && !SYS_server_exit) |
| 643 |
{ |
{ |
| 644 |
if (reload_menu(&bbs_menu) < 0) |
SYS_conf_reload = 0; |
| 645 |
|
sd_notify(0, "RELOADING=1"); |
| 646 |
|
|
| 647 |
|
// Reload configuration |
| 648 |
|
if (load_conf(CONF_BBSD) < 0) |
| 649 |
|
{ |
| 650 |
|
log_error("Reload conf failed\n"); |
| 651 |
|
} |
| 652 |
|
|
| 653 |
|
if (load_menu(&bbs_menu_new, CONF_MENU) < 0) |
| 654 |
{ |
{ |
| 655 |
log_error("Reload menu failed\n"); |
unload_menu(&bbs_menu_new); |
| 656 |
|
log_error("Reload bbs menu failed\n"); |
| 657 |
} |
} |
| 658 |
else |
else |
| 659 |
{ |
{ |
| 660 |
log_std("Reload menu successfully\n"); |
unload_menu(&bbs_menu); |
| 661 |
|
memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new)); |
| 662 |
|
log_common("Reload bbs menu successfully\n"); |
| 663 |
|
} |
| 664 |
|
|
| 665 |
|
if (load_menu(&top10_menu_new, CONF_TOP10_MENU) < 0) |
| 666 |
|
{ |
| 667 |
|
unload_menu(&top10_menu_new); |
| 668 |
|
log_error("Reload top10 menu failed\n"); |
| 669 |
|
} |
| 670 |
|
else |
| 671 |
|
{ |
| 672 |
|
unload_menu(&top10_menu); |
| 673 |
|
top10_menu_new.allow_exit = 1; |
| 674 |
|
memcpy(&top10_menu, &top10_menu_new, sizeof(top10_menu_new)); |
| 675 |
|
log_common("Reload top10 menu successfully\n"); |
| 676 |
} |
} |
|
SYS_menu_reload = 0; |
|
|
} |
|
| 677 |
|
|
| 678 |
sigprocmask(SIG_SETMASK, &osigset, NULL); |
for (int i = 0; i < data_files_load_startup_count; i++) |
| 679 |
|
{ |
| 680 |
|
if (load_file(data_files_load_startup[i]) < 0) |
| 681 |
|
{ |
| 682 |
|
log_error("load_file(%s) error\n", data_files_load_startup[i]); |
| 683 |
|
} |
| 684 |
|
} |
| 685 |
|
log_common("Reload data files successfully\n"); |
| 686 |
|
|
| 687 |
|
// Load section config and gen_ex |
| 688 |
|
if (load_section_config_from_db(1) < 0) |
| 689 |
|
{ |
| 690 |
|
log_error("load_section_config_from_db(1) error\n"); |
| 691 |
|
} |
| 692 |
|
else |
| 693 |
|
{ |
| 694 |
|
log_common("Reload section config and gen_ex successfully\n"); |
| 695 |
|
} |
| 696 |
|
|
| 697 |
|
sd_notify(0, "READY=1"); |
| 698 |
|
} |
| 699 |
|
|
| 700 |
FD_ZERO(&testfds); |
nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second |
|
FD_SET(socket_server, &testfds); |
|
|
|
|
|
timeout.tv_sec = 0; |
|
|
timeout.tv_usec = 100 * 1000; // 0.1 second |
|
|
|
|
|
ret = select(FD_SETSIZE, &testfds, NULL, NULL, &timeout); |
|
| 701 |
|
|
| 702 |
if (ret < 0) |
if (nfds < 0) |
| 703 |
{ |
{ |
| 704 |
if (errno != EINTR) |
if (errno != EINTR) |
| 705 |
{ |
{ |
| 706 |
log_error("Accept connection error: %d\n", errno); |
log_error("epoll_wait() error (%d)\n", errno); |
| 707 |
|
break; |
| 708 |
} |
} |
| 709 |
continue; |
continue; |
| 710 |
} |
} |
|
else if (ret == 0) // timeout |
|
|
{ |
|
|
continue; |
|
|
} |
|
| 711 |
|
|
| 712 |
// Stop accept new connection on exit |
// Stop accept new connection on exit |
| 713 |
if (SYS_server_exit) |
if (SYS_server_exit) |
| 715 |
continue; |
continue; |
| 716 |
} |
} |
| 717 |
|
|
| 718 |
if (FD_ISSET(socket_server, &testfds)) |
for (int i = 0; i < nfds; i++) |
| 719 |
{ |
{ |
| 720 |
flags = fcntl(socket_server, F_GETFL, 0); |
if (events[i].data.fd == socket_server[0] || events[i].data.fd == socket_server[1]) |
|
fcntl(socket_server, F_SETFL, flags | O_NONBLOCK); |
|
|
while ((socket_client = |
|
|
accept(socket_server, (struct sockaddr *)&sin, &namelen)) < 0) |
|
| 721 |
{ |
{ |
| 722 |
if (errno != EWOULDBLOCK && errno != ECONNABORTED && errno != EINTR) |
SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0); |
| 723 |
|
|
| 724 |
|
while (!SYS_server_exit) // Accept all incoming connections until error |
| 725 |
{ |
{ |
| 726 |
log_error("Accept connection error\n"); |
addrlen = sizeof(sin); |
| 727 |
break; |
socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen); |
| 728 |
|
if (socket_client < 0) |
| 729 |
|
{ |
| 730 |
|
if (errno == EAGAIN || errno == EWOULDBLOCK) |
| 731 |
|
{ |
| 732 |
|
break; |
| 733 |
|
} |
| 734 |
|
else if (errno == EINTR) |
| 735 |
|
{ |
| 736 |
|
continue; |
| 737 |
|
} |
| 738 |
|
else |
| 739 |
|
{ |
| 740 |
|
log_error("accept(socket_server) error (%d)\n", errno); |
| 741 |
|
break; |
| 742 |
|
} |
| 743 |
|
} |
| 744 |
|
|
| 745 |
|
strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1); |
| 746 |
|
hostaddr_client[sizeof(hostaddr_client) - 1] = '\0'; |
| 747 |
|
|
| 748 |
|
port_client = ntohs(sin.sin_port); |
| 749 |
|
|
| 750 |
|
log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client); |
| 751 |
|
|
| 752 |
|
if (SYS_child_process_count - 1 < BBS_max_client) |
| 753 |
|
{ |
| 754 |
|
j = 0; |
| 755 |
|
for (i = 0; i < BBS_max_client; i++) |
| 756 |
|
{ |
| 757 |
|
if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr) |
| 758 |
|
{ |
| 759 |
|
j++; |
| 760 |
|
if (j >= BBS_max_client_per_ip) |
| 761 |
|
{ |
| 762 |
|
log_common("Too many client connections (%d) from %s\n", j, hostaddr_client); |
| 763 |
|
break; |
| 764 |
|
} |
| 765 |
|
} |
| 766 |
|
} |
| 767 |
|
|
| 768 |
|
if (j < BBS_max_client_per_ip) |
| 769 |
|
{ |
| 770 |
|
if ((pid = fork_server()) < 0) |
| 771 |
|
{ |
| 772 |
|
log_error("fork_server() error\n"); |
| 773 |
|
} |
| 774 |
|
else if (pid > 0) |
| 775 |
|
{ |
| 776 |
|
i = 0; |
| 777 |
|
for (; i < BBS_max_client; i++) |
| 778 |
|
{ |
| 779 |
|
if (process_sockaddr_pool[i].pid == 0) |
| 780 |
|
{ |
| 781 |
|
break; |
| 782 |
|
} |
| 783 |
|
} |
| 784 |
|
|
| 785 |
|
if (i >= BBS_max_client) |
| 786 |
|
{ |
| 787 |
|
log_error("Process sockaddr pool depleted\n"); |
| 788 |
|
} |
| 789 |
|
else |
| 790 |
|
{ |
| 791 |
|
process_sockaddr_pool[i].pid = pid; |
| 792 |
|
process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr; |
| 793 |
|
} |
| 794 |
|
} |
| 795 |
|
} |
| 796 |
|
} |
| 797 |
|
else |
| 798 |
|
{ |
| 799 |
|
log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1); |
| 800 |
|
} |
| 801 |
|
|
| 802 |
|
if (close(socket_client) == -1) |
| 803 |
|
{ |
| 804 |
|
log_error("close(socket_lient) error (%d)\n", errno); |
| 805 |
|
} |
| 806 |
} |
} |
| 807 |
} |
} |
|
fcntl(socket_server, F_SETFL, flags); |
|
|
} |
|
|
|
|
|
if (socket_client < 0) |
|
|
{ |
|
|
log_error("Accept connection error\n"); |
|
|
continue; |
|
| 808 |
} |
} |
| 809 |
|
} |
| 810 |
|
|
| 811 |
strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1); |
if (close(epollfd) < 0) |
| 812 |
hostaddr_client[sizeof(hostaddr_client) - 1] = '\0'; |
{ |
| 813 |
|
log_error("close(epoll) error (%d)\n"); |
| 814 |
port_client = ntohs(sin.sin_port); |
} |
|
|
|
|
log_std("Accept connection from %s:%d\n", hostaddr_client, |
|
|
port_client); |
|
| 815 |
|
|
| 816 |
if (fork_server() < 0) |
for (i = 0; i < 2; i++) |
| 817 |
{ |
{ |
| 818 |
log_error("Fork error\n"); |
fcntl(socket_server[i], F_SETFL, flags[i]); |
|
} |
|
| 819 |
|
|
| 820 |
if (close(socket_client) == -1) |
if (close(socket_server[i]) == -1) |
| 821 |
{ |
{ |
| 822 |
log_error("Close client socket failed\n"); |
log_error("Close server socket failed\n"); |
| 823 |
} |
} |
| 824 |
} |
} |
| 825 |
|
|
| 826 |
if (close(socket_server) == -1) |
ssh_bind_free(sshbind); |
| 827 |
{ |
ssh_finalize(); |
|
log_error("Close server socket failed\n"); |
|
|
} |
|
| 828 |
|
|
| 829 |
return 0; |
return 0; |
| 830 |
} |
} |