lbbs/src/net_server.c

/***************************************************************************
                                                  net_server.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "bbs.h"
#include "bbs_main.h"
#include "common.h"
#include "database.h"
#include "file_loader.h"
#include "io.h"
#include "init.h"
#include "log.h"
#include "login.h"
#include "menu.h"
#include "net_server.h"
#include "section_list.h"
#include "section_list_loader.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <libssh/callbacks.h>
#include <libssh/libssh.h>
#include <libssh/server.h>
#include <netinet/in.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <systemd/sd-daemon.h>

#define WAIT_CHILD_PROCESS_EXIT_TIMEOUT 5 // second
#define WAIT_CHILD_PROCESS_KILL_TIMEOUT 1 // second

struct process_sockaddr_t
{
        pid_t pid;
        in_addr_t s_addr;
};
typedef struct process_sockaddr_t PROCESS_SOCKADDR;

static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];

#define SSH_AUTH_MAX_DURATION (60 * 1000) // milliseconds

struct ssl_server_cb_data_t
{
        int tries;
        int error;
};

static int auth_password(ssh_session session, const char *user,
                                                 const char *password, void *userdata)
{
        struct ssl_server_cb_data_t *p_data = userdata;
        int ret;

        if (strcmp(user, "guest") == 0)
        {
                ret = load_guest_info();
        }
        else
        {
                ret = check_user(user, password);
        }

        if (ret == 0)
        {
                return SSH_AUTH_SUCCESS;
        }

        if ((++(p_data->tries)) >= BBS_login_retry_times)
        {
                p_data->error = 1;
        }

        return SSH_AUTH_DENIED;
}

static int pty_request(ssh_session session, ssh_channel channel, const char *term,
                                           int x, int y, int px, int py, void *userdata)
{
        return 0;
}

static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
{
        return 0;
}

static struct ssh_channel_callbacks_struct channel_cb = {
        .channel_pty_request_function = pty_request,
        .channel_shell_request_function = shell_request};

static ssh_channel new_session_channel(ssh_session session, void *userdata)
{
        if (SSH_channel != NULL)
        {
                return NULL;
        }

        SSH_channel = ssh_channel_new(session);
        ssh_callbacks_init(&channel_cb);
        ssh_set_channel_callbacks(SSH_channel, &channel_cb);

        return SSH_channel;
}

static int fork_server(void)
{
        ssh_event event;
        int pid;
        int i;
        int ret;

        struct ssl_server_cb_data_t cb_data = {
                .tries = 0,
                .error = 0,
        };

        struct ssh_server_callbacks_struct cb = {
                .userdata = &cb_data,
                .auth_password_function = auth_password,
                .channel_open_request_session_function = new_session_channel,
        };

        pid = fork();

        if (pid > 0) // Parent process
        {
                SYS_child_process_count++;
                log_common("Child process (%d) start\n", pid);
                return pid;
        }
        else if (pid < 0) // Error
        {
                log_error("fork() error (%d)\n", errno);
                return -1;
        }

        // Child process

        if (close(socket_server[0]) == -1 || close(socket_server[1]) == -1)
        {
                log_error("Close server socket failed\n");
        }

        SSH_session = ssh_new();

        if (SSH_v2)
        {
                if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
                {
                        log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
                        goto cleanup;
                }

                ssh_bind_free(sshbind);

                ssh_callbacks_init(&cb);
                ssh_set_server_callbacks(SSH_session, &cb);

                if (ssh_handle_key_exchange(SSH_session))
                {
                        log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
                        goto cleanup;
                }
                ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);

                event = ssh_event_new();
                ssh_event_add_session(event, SSH_session);

                for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
                {
                        ret = ssh_event_dopoll(event, 100); // 0.1 second
                        if (ret == SSH_ERROR)
                        {
                                log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
                                goto cleanup;
                        }
                }

                if (cb_data.error)
                {
                        log_error("SSH auth error, tried %d times\n", cb_data.tries);
                        goto cleanup;
                }
        }

        // Redirect Input
        close(STDIN_FILENO);
        if (dup2(socket_client, STDIN_FILENO) == -1)
        {
                log_error("Redirect stdin to client socket failed\n");
                goto cleanup;
        }

        // Redirect Output
        close(STDOUT_FILENO);
        if (dup2(socket_client, STDOUT_FILENO) == -1)
        {
                log_error("Redirect stdout to client socket failed\n");
                goto cleanup;
        }

        SYS_child_process_count = 0;

        bbs_main();

cleanup:
        // Child process exit
        SYS_server_exit = 1;

        if (SSH_v2)
        {
                ssh_channel_free(SSH_channel);
                ssh_disconnect(SSH_session);
        }
        else if (close(socket_client) == -1)
        {
                log_error("Close client socket failed\n");
        }

        ssh_free(SSH_session);
        ssh_finalize();

        // Close Input and Output for client
        close(STDIN_FILENO);
        close(STDOUT_FILENO);

        log_common("Process exit normally\n");
        log_end();

        _exit(0);

        return 0;
}

int net_server(const char *hostaddr, in_port_t port[])
{
        unsigned int addrlen;
        int ret;
        int flags[2];
        struct sockaddr_in sin;
        struct epoll_event ev, events[MAX_EVENTS];
        int nfds, epollfd;
        siginfo_t siginfo;
        int notify_child_exit = 0;
        time_t tm_notify_child_exit = time(NULL);
        int sd_notify_stopping = 0;
        MENU_SET bbs_menu_new;
        int i, j;
        pid_t pid;
        int ssh_log_level = SSH_LOG_NOLOG;

        ssh_init();

        sshbind = ssh_bind_new();

        if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
        {
                log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
                ssh_bind_free(sshbind);
                return -1;
        }

        epollfd = epoll_create1(0);
        if (epollfd < 0)
        {
                log_error("epoll_create1() error (%d)\n", errno);
                return -1;
        }

        // Server socket
        for (i = 0; i < 2; i++)
        {
                socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

                if (socket_server[i] < 0)
                {
                        log_error("Create socket_server error (%d)\n", errno);
                        return -1;
                }

                sin.sin_family = AF_INET;
                sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
                sin.sin_port = htons(port[i]);

                // Reuse address and port
                flags[i] = 1;
                if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
                {
                        log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
                }
                if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
                {
                        log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
                }

                if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
                {
                        log_error("Bind address %s:%u error (%d)\n",
                                          inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
                        return -1;
                }

                if (listen(socket_server[i], 10) < 0)
                {
                        log_error("Telnet socket listen error (%d)\n", errno);
                        return -1;
                }

                log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));

                ev.events = EPOLLIN;
                ev.data.fd = socket_server[i];
                if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
                {
                        log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
                        if (close(epollfd) < 0)
                        {
                                log_error("close(epoll) error (%d)\n");
                        }
                        return -1;
                }

                flags[i] = fcntl(socket_server[i], F_GETFL, 0);
                fcntl(socket_server[i], F_SETFL, flags[i] | O_NONBLOCK);
        }

        // Startup complete
        sd_notifyf(0, "READY=1\n"
                                  "STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
                                  "MAINPID=%d",
                           hostaddr, port[0], hostaddr, port[1], getpid());

        while (!SYS_server_exit || SYS_child_process_count > 0)
        {
                if (SYS_server_exit && !sd_notify_stopping)
                {
                        sd_notify(0, "STOPPING=1");
                        sd_notify_stopping = 1;
                }

                while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
                {
                        SYS_child_exit = 0;

                        siginfo.si_pid = 0;
                        ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
                        if (ret == 0 && siginfo.si_pid > 0)
                        {
                                SYS_child_exit = 1; // Retry waitid

                                SYS_child_process_count--;
                                log_common("Child process (%d) exited\n", siginfo.si_pid);

                                if (siginfo.si_pid != section_list_loader_pid)
                                {
                                        i = 0;
                                        for (; i < BBS_max_client; i++)
                                        {
                                                if (process_sockaddr_pool[i].pid == siginfo.si_pid)
                                                {
                                                        process_sockaddr_pool[i].pid = 0;
                                                        break;
                                                }
                                        }
                                        if (i >= BBS_max_client)
                                        {
                                                log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
                                        }
                                }
                        }
                        else if (ret == 0)
                        {
                                break;
                        }
                        else if (ret < 0)
                        {
                                log_error("Error in waitid: %d\n", errno);
                                break;
                        }
                }

                if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
                {
                        if (notify_child_exit == 0)
                        {
                                sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count);
                                log_common("Notify %d child process to exit\n", SYS_child_process_count);

                                if (kill(0, SIGTERM) < 0)
                                {
                                        log_error("Send SIGTERM signal failed (%d)\n", errno);
                                }

                                notify_child_exit = 1;
                                tm_notify_child_exit = time(NULL);
                        }
                        else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT)
                        {
                                sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count);

                                for (i = 0; i < BBS_max_client; i++)
                                {
                                        if (process_sockaddr_pool[i].pid != 0)
                                        {
                                                log_error("Kill child process (pid=%d)\n", process_sockaddr_pool[i].pid);
                                                if (kill(process_sockaddr_pool[i].pid, SIGKILL) < 0)
                                                {
                                                        log_error("Send SIGKILL signal failed (%d)\n", errno);
                                                }
                                        }
                                }

                                notify_child_exit = 2;
                                tm_notify_child_exit = time(NULL);
                        }
                        else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT)
                        {
                                log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count);
                                SYS_child_process_count = 0;
                        }
                }

                if (SYS_conf_reload && !SYS_server_exit)
                {
                        SYS_conf_reload = 0;
                        sd_notify(0, "RELOADING=1");

                        // Reload configuration
                        if (load_conf(CONF_BBSD) < 0)
                        {
                                log_error("Reload conf failed\n");
                        }

                        if (load_menu(&bbs_menu_new, CONF_MENU) < 0)
                        {
                                unload_menu(&bbs_menu_new);
                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                unload_menu(&bbs_menu);
                                memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
                                log_common("Reload menu successfully\n");
                        }

                        for (int i = 0; i < data_files_load_startup_count; i++)
                        {
                                if (load_file(data_files_load_startup[i]) < 0)
                                {
                                        log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
                                }
                        }
                        log_common("Reload data files successfully\n");

                        // Load section config and gen_ex
                        if (load_section_config_from_db(1) < 0)
                        {
                                log_error("load_section_config_from_db(1) error\n");
                        }
                        else
                        {
                                log_common("Reload section config and gen_ex successfully\n");
                        }

                        sd_notify(0, "READY=1");
                }

                nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second

                if (nfds < 0)
                {
                        if (errno != EINTR)
                        {
                                log_error("epoll_wait() error (%d)\n", errno);
                                break;
                        }
                        continue;
                }

                // Stop accept new connection on exit
                if (SYS_server_exit)
                {
                        continue;
                }

                for (int i = 0; i < nfds; i++)
                {
                        if (events[i].data.fd == socket_server[0] || events[i].data.fd == socket_server[1])
                        {
                                SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);

                                while (!SYS_server_exit) // Accept all incoming connections until error
                                {
                                        addrlen = sizeof(sin);
                                        socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
                                        if (socket_client < 0)
                                        {
                                                if (errno == EAGAIN || errno == EWOULDBLOCK)
                                                {
                                                        break;
                                                }
                                                else if (errno == EINTR)
                                                {
                                                        continue;
                                                }
                                                else
                                                {
                                                        log_error("accept(socket_server) error (%d)\n", errno);
                                                        break;
                                                }
                                        }

                                        strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
                                        hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';

                                        port_client = ntohs(sin.sin_port);

                                        log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);

                                        if (SYS_child_process_count - 1 < BBS_max_client)
                                        {
                                                j = 0;
                                                for (i = 0; i < BBS_max_client; i++)
                                                {
                                                        if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
                                                        {
                                                                j++;
                                                                if (j >= BBS_max_client_per_ip)
                                                                {
                                                                        log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
                                                                        break;
                                                                }
                                                        }
                                                }

                                                if (j < BBS_max_client_per_ip)
                                                {
                                                        if ((pid = fork_server()) < 0)
                                                        {
                                                                log_error("fork_server() error\n");
                                                        }
                                                        else if (pid > 0)
                                                        {
                                                                i = 0;
                                                                for (; i < BBS_max_client; i++)
                                                                {
                                                                        if (process_sockaddr_pool[i].pid == 0)
                                                                        {
                                                                                break;
                                                                        }
                                                                }

                                                                if (i >= BBS_max_client)
                                                                {
                                                                        log_error("Process sockaddr pool depleted\n");
                                                                }
                                                                else
                                                                {
                                                                        process_sockaddr_pool[i].pid = pid;
                                                                        process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
                                                                }
                                                        }
                                                }
                                        }
                                        else
                                        {
                                                log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
                                        }

                                        if (close(socket_client) == -1)
                                        {
                                                log_error("close(socket_lient) error (%d)\n", errno);
                                        }
                                }
                        }
                }
        }

        if (close(epollfd) < 0)
        {
                log_error("close(epoll) error (%d)\n");
        }

        for (i = 0; i < 2; i++)
        {
                fcntl(socket_server[i], F_SETFL, flags[i]);

                if (close(socket_server[i]) == -1)
                {
                        log_error("Close server socket failed\n");
                }
        }

        ssh_bind_free(sshbind);
        ssh_finalize();

        return 0;
}
1	sysadm	1.1	/***************************************************************************
2	sysadm	1.13	net_server.c - description
3			-------------------
4	sysadm	1.18	Copyright : (C) 2004-2025 by Leaflet
5			Email : leaflet@leafok.com
6	sysadm	1.1	***************************************************************************/
7
8			/***************************************************************************
9			* *
10			* This program is free software; you can redistribute it and/or modify *
11			* it under the terms of the GNU General Public License as published by *
12	sysadm	1.18	* the Free Software Foundation; either version 3 of the License, or *
13	sysadm	1.1	* (at your option) any later version. *
14			* *
15			***************************************************************************/
16
17	sysadm	1.62	#include "bbs.h"
18			#include "bbs_main.h"
19	sysadm	1.1	#include "common.h"
20	sysadm	1.62	#include "database.h"
21			#include "file_loader.h"
22	sysadm	1.7	#include "io.h"
23	sysadm	1.44	#include "init.h"
24	sysadm	1.62	#include "log.h"
25			#include "login.h"
26	sysadm	1.19	#include "menu.h"
27	sysadm	1.62	#include "net_server.h"
28	sysadm	1.67	#include "section_list.h"
29	sysadm	1.42	#include "section_list_loader.h"
30	sysadm	1.20	#include <errno.h>
31			#include <fcntl.h>
32	sysadm	1.19	#include <signal.h>
33	sysadm	1.20	#include <stdlib.h>
34	sysadm	1.62	#include <string.h>
35	sysadm	1.19	#include <unistd.h>
36	sysadm	1.9	#include <arpa/inet.h>
37	sysadm	1.62	#include <libssh/callbacks.h>
38	sysadm	1.55	#include <libssh/libssh.h>
39			#include <libssh/server.h>
40	sysadm	1.62	#include <netinet/in.h>
41	sysadm	1.61	#include <sys/epoll.h>
42	sysadm	1.62	#include <sys/socket.h>
43	sysadm	1.61	#include <sys/syscall.h>
44			#include <sys/types.h>
45			#include <sys/wait.h>
46			#include <systemd/sd-daemon.h>
47	sysadm	1.3
48	sysadm	1.70	#define WAIT_CHILD_PROCESS_EXIT_TIMEOUT 5 // second
49			#define WAIT_CHILD_PROCESS_KILL_TIMEOUT 1 // second
50
51	sysadm	1.44	struct process_sockaddr_t
52			{
53			pid_t pid;
54			in_addr_t s_addr;
55			};
56			typedef struct process_sockaddr_t PROCESS_SOCKADDR;
57
58	sysadm	1.48	static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
59	sysadm	1.44
60	sysadm	1.58	#define SSH_AUTH_MAX_DURATION (60 * 1000) // milliseconds
61	sysadm	1.55
62			struct ssl_server_cb_data_t
63			{
64			int tries;
65			int error;
66			};
67
68			static int auth_password(ssh_session session, const char *user,
69			const char password, void userdata)
70			{
71			struct ssl_server_cb_data_t *p_data = userdata;
72			int ret;
73
74			if (strcmp(user, "guest") == 0)
75			{
76	sysadm	1.57	ret = load_guest_info();
77	sysadm	1.55	}
78			else
79			{
80	sysadm	1.57	ret = check_user(user, password);
81	sysadm	1.55	}
82
83			if (ret == 0)
84			{
85			return SSH_AUTH_SUCCESS;
86			}
87
88			if ((++(p_data->tries)) >= BBS_login_retry_times)
89			{
90			p_data->error = 1;
91			}
92
93			return SSH_AUTH_DENIED;
94			}
95
96			static int pty_request(ssh_session session, ssh_channel channel, const char *term,
97			int x, int y, int px, int py, void *userdata)
98			{
99			return 0;
100			}
101
102			static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
103			{
104			return 0;
105			}
106
107			static struct ssh_channel_callbacks_struct channel_cb = {
108			.channel_pty_request_function = pty_request,
109			.channel_shell_request_function = shell_request};
110
111			static ssh_channel new_session_channel(ssh_session session, void *userdata)
112			{
113			if (SSH_channel != NULL)
114			{
115			return NULL;
116			}
117
118			SSH_channel = ssh_channel_new(session);
119			ssh_callbacks_init(&channel_cb);
120			ssh_set_channel_callbacks(SSH_channel, &channel_cb);
121
122			return SSH_channel;
123			}
124
125	sysadm	1.56	static int fork_server(void)
126	sysadm	1.55	{
127			ssh_event event;
128			int pid;
129			int i;
130			int ret;
131
132			struct ssl_server_cb_data_t cb_data = {
133			.tries = 0,
134			.error = 0,
135			};
136
137			struct ssh_server_callbacks_struct cb = {
138			.userdata = &cb_data,
139			.auth_password_function = auth_password,
140			.channel_open_request_session_function = new_session_channel,
141			};
142
143			pid = fork();
144
145			if (pid > 0) // Parent process
146			{
147			SYS_child_process_count++;
148			log_common("Child process (%d) start\n", pid);
149			return pid;
150			}
151			else if (pid < 0) // Error
152			{
153			log_error("fork() error (%d)\n", errno);
154			return -1;
155			}
156
157			// Child process
158
159			if (close(socket_server[0]) == -1 \|\| close(socket_server[1]) == -1)
160			{
161			log_error("Close server socket failed\n");
162			}
163
164			SSH_session = ssh_new();
165
166			if (SSH_v2)
167			{
168			if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
169			{
170			log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
171			goto cleanup;
172			}
173
174			ssh_bind_free(sshbind);
175
176			ssh_callbacks_init(&cb);
177			ssh_set_server_callbacks(SSH_session, &cb);
178
179			if (ssh_handle_key_exchange(SSH_session))
180			{
181			log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
182			goto cleanup;
183			}
184			ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
185
186			event = ssh_event_new();
187			ssh_event_add_session(event, SSH_session);
188
189	sysadm	1.58	for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
190	sysadm	1.55	{
191	sysadm	1.58	ret = ssh_event_dopoll(event, 100); // 0.1 second
192	sysadm	1.55	if (ret == SSH_ERROR)
193			{
194			log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
195			goto cleanup;
196			}
197			}
198
199			if (cb_data.error)
200			{
201			log_error("SSH auth error, tried %d times\n", cb_data.tries);
202			goto cleanup;
203			}
204			}
205
206			// Redirect Input
207			close(STDIN_FILENO);
208			if (dup2(socket_client, STDIN_FILENO) == -1)
209			{
210			log_error("Redirect stdin to client socket failed\n");
211			goto cleanup;
212			}
213
214			// Redirect Output
215			close(STDOUT_FILENO);
216			if (dup2(socket_client, STDOUT_FILENO) == -1)
217			{
218			log_error("Redirect stdout to client socket failed\n");
219			goto cleanup;
220			}
221
222			SYS_child_process_count = 0;
223
224			bbs_main();
225
226			cleanup:
227			// Child process exit
228			SYS_server_exit = 1;
229
230			if (SSH_v2)
231			{
232			ssh_channel_free(SSH_channel);
233			ssh_disconnect(SSH_session);
234			}
235			else if (close(socket_client) == -1)
236			{
237			log_error("Close client socket failed\n");
238			}
239
240			ssh_free(SSH_session);
241			ssh_finalize();
242
243			// Close Input and Output for client
244			close(STDIN_FILENO);
245			close(STDOUT_FILENO);
246
247			log_common("Process exit normally\n");
248			log_end();
249
250			_exit(0);
251
252			return 0;
253			}
254
255	sysadm	1.52	int net_server(const char *hostaddr, in_port_t port[])
256	sysadm	1.1	{
257	sysadm	1.52	unsigned int addrlen;
258	sysadm	1.19	int ret;
259	sysadm	1.52	int flags[2];
260	sysadm	1.13	struct sockaddr_in sin;
261	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
262			int nfds, epollfd;
263	sysadm	1.19	siginfo_t siginfo;
264	sysadm	1.70	int notify_child_exit = 0;
265			time_t tm_notify_child_exit = time(NULL);
266	sysadm	1.31	int sd_notify_stopping = 0;
267	sysadm	1.66	MENU_SET bbs_menu_new;
268	sysadm	1.44	int i, j;
269			pid_t pid;
270	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
271	sysadm	1.10
272	sysadm	1.51	ssh_init();
273
274			sshbind = ssh_bind_new();
275
276			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
277			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
278			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
279	sysadm	1.63	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 \|\|
280	sysadm	1.51	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
281			{
282			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
283			ssh_bind_free(sshbind);
284			return -1;
285			}
286	sysadm	1.10
287	sysadm	1.52	epollfd = epoll_create1(0);
288			if (epollfd < 0)
289	sysadm	1.13	{
290	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
291	sysadm	1.27	return -1;
292	sysadm	1.13	}
293	sysadm	1.10
294	sysadm	1.52	// Server socket
295			for (i = 0; i < 2; i++)
296	sysadm	1.23	{
297	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
298	sysadm	1.23
299	sysadm	1.52	if (socket_server[i] < 0)
300			{
301			log_error("Create socket_server error (%d)\n", errno);
302			return -1;
303			}
304	sysadm	1.10
305	sysadm	1.52	sin.sin_family = AF_INET;
306			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
307			sin.sin_port = htons(port[i]);
308
309			// Reuse address and port
310			flags[i] = 1;
311			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
312			{
313			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
314			}
315			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
316			{
317			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
318			}
319	sysadm	1.1
320	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
321			{
322			log_error("Bind address %s:%u error (%d)\n",
323			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
324			return -1;
325			}
326	sysadm	1.16
327	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
328			{
329			log_error("Telnet socket listen error (%d)\n", errno);
330			return -1;
331			}
332	sysadm	1.13
333	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
334	sysadm	1.25
335	sysadm	1.52	ev.events = EPOLLIN;
336			ev.data.fd = socket_server[i];
337			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
338	sysadm	1.30	{
339	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
340			if (close(epollfd) < 0)
341			{
342			log_error("close(epoll) error (%d)\n");
343			}
344			return -1;
345	sysadm	1.30	}
346	sysadm	1.52
347			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
348			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
349	sysadm	1.25	}
350
351	sysadm	1.31	// Startup complete
352			sd_notifyf(0, "READY=1\n"
353	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
354	sysadm	1.31	"MAINPID=%d",
355	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
356	sysadm	1.31
357	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
358	sysadm	1.13	{
359	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
360			{
361			sd_notify(0, "STOPPING=1");
362			sd_notify_stopping = 1;
363			}
364	sysadm	1.37
365	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
366	sysadm	1.19	{
367	sysadm	1.30	SYS_child_exit = 0;
368
369	sysadm	1.19	siginfo.si_pid = 0;
370			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
371			if (ret == 0 && siginfo.si_pid > 0)
372			{
373	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
374
375	sysadm	1.19	SYS_child_process_count--;
376	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
377	sysadm	1.44
378	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
379	sysadm	1.44	{
380	sysadm	1.45	i = 0;
381			for (; i < BBS_max_client; i++)
382	sysadm	1.44	{
383	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
384			{
385			process_sockaddr_pool[i].pid = 0;
386			break;
387			}
388			}
389			if (i >= BBS_max_client)
390			{
391			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
392	sysadm	1.44	}
393			}
394	sysadm	1.19	}
395			else if (ret == 0)
396			{
397			break;
398			}
399			else if (ret < 0)
400			{
401			log_error("Error in waitid: %d\n", errno);
402			break;
403			}
404			}
405
406	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
407	sysadm	1.21	{
408	sysadm	1.70	if (notify_child_exit == 0)
409	sysadm	1.21	{
410	sysadm	1.70	sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count);
411			log_common("Notify %d child process to exit\n", SYS_child_process_count);
412
413			if (kill(0, SIGTERM) < 0)
414			{
415			log_error("Send SIGTERM signal failed (%d)\n", errno);
416			}
417
418			notify_child_exit = 1;
419			tm_notify_child_exit = time(NULL);
420	sysadm	1.21	}
421	sysadm	1.70	else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT)
422			{
423			sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count);
424	sysadm	1.31
425	sysadm	1.70	for (i = 0; i < BBS_max_client; i++)
426			{
427			if (process_sockaddr_pool[i].pid != 0)
428			{
429			log_error("Kill child process (pid=%d)\n", process_sockaddr_pool[i].pid);
430			if (kill(process_sockaddr_pool[i].pid, SIGKILL) < 0)
431			{
432			log_error("Send SIGKILL signal failed (%d)\n", errno);
433			}
434			}
435			}
436	sysadm	1.69
437	sysadm	1.70	notify_child_exit = 2;
438			tm_notify_child_exit = time(NULL);
439			}
440			else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT)
441			{
442			log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count);
443			SYS_child_process_count = 0;
444			}
445	sysadm	1.21	}
446
447	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
448	sysadm	1.19	{
449	sysadm	1.44	SYS_conf_reload = 0;
450	sysadm	1.37	sd_notify(0, "RELOADING=1");
451	sysadm	1.30
452	sysadm	1.44	// Reload configuration
453			if (load_conf(CONF_BBSD) < 0)
454			{
455			log_error("Reload conf failed\n");
456			}
457
458	sysadm	1.68	if (load_menu(&bbs_menu_new, CONF_MENU) < 0)
459	sysadm	1.34	{
460	sysadm	1.68	unload_menu(&bbs_menu_new);
461			log_error("Reload menu failed\n");
462	sysadm	1.19	}
463			else
464			{
465	sysadm	1.68	unload_menu(&bbs_menu);
466			memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
467			log_common("Reload menu successfully\n");
468	sysadm	1.19	}
469	sysadm	1.37
470	sysadm	1.35	for (int i = 0; i < data_files_load_startup_count; i++)
471			{
472	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
473	sysadm	1.35	{
474			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
475			}
476			}
477	sysadm	1.49	log_common("Reload data files successfully\n");
478	sysadm	1.35
479	sysadm	1.68	// Load section config and gen_ex
480			if (load_section_config_from_db(1) < 0)
481			{
482			log_error("load_section_config_from_db(1) error\n");
483			}
484			else
485	sysadm	1.42	{
486	sysadm	1.68	log_common("Reload section config and gen_ex successfully\n");
487	sysadm	1.42	}
488	sysadm	1.68
489			sd_notify(0, "READY=1");
490	sysadm	1.42	}
491
492	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
493	sysadm	1.22
494	sysadm	1.25	if (nfds < 0)
495	sysadm	1.19	{
496			if (errno != EINTR)
497			{
498	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
499			break;
500	sysadm	1.19	}
501			continue;
502			}
503	sysadm	1.13
504	sysadm	1.19	// Stop accept new connection on exit
505			if (SYS_server_exit)
506	sysadm	1.13	{
507			continue;
508			}
509
510	sysadm	1.25	for (int i = 0; i < nfds; i++)
511	sysadm	1.13	{
512	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
513	sysadm	1.13	{
514	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
515	sysadm	1.52
516	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
517	sysadm	1.13	{
518	sysadm	1.52	addrlen = sizeof(sin);
519	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
520	sysadm	1.25	if (socket_client < 0)
521			{
522	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
523			{
524			break;
525			}
526			else if (errno == EINTR)
527			{
528			continue;
529			}
530			else
531	sysadm	1.25	{
532			log_error("accept(socket_server) error (%d)\n", errno);
533	sysadm	1.28	break;
534	sysadm	1.25	}
535			}
536
537			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
538			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
539
540			port_client = ntohs(sin.sin_port);
541
542	sysadm	1.64	log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
543	sysadm	1.25
544	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
545	sysadm	1.25	{
546	sysadm	1.44	j = 0;
547			for (i = 0; i < BBS_max_client; i++)
548			{
549			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
550			{
551			j++;
552			if (j >= BBS_max_client_per_ip)
553			{
554	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
555	sysadm	1.44	break;
556			}
557			}
558			}
559
560			if (j < BBS_max_client_per_ip)
561	sysadm	1.43	{
562	sysadm	1.52	if ((pid = fork_server()) < 0)
563	sysadm	1.44	{
564			log_error("fork_server() error\n");
565			}
566			else if (pid > 0)
567			{
568			i = 0;
569			for (; i < BBS_max_client; i++)
570			{
571			if (process_sockaddr_pool[i].pid == 0)
572			{
573			break;
574			}
575			}
576
577			if (i >= BBS_max_client)
578			{
579			log_error("Process sockaddr pool depleted\n");
580			}
581			else
582			{
583			process_sockaddr_pool[i].pid = pid;
584			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
585			}
586			}
587	sysadm	1.43	}
588			}
589			else
590			{
591			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
592	sysadm	1.25	}
593
594			if (close(socket_client) == -1)
595			{
596			log_error("close(socket_lient) error (%d)\n", errno);
597			}
598	sysadm	1.13	}
599			}
600			}
601	sysadm	1.25	}
602	sysadm	1.13
603	sysadm	1.30	if (close(epollfd) < 0)
604			{
605			log_error("close(epoll) error (%d)\n");
606			}
607
608	sysadm	1.52	for (i = 0; i < 2; i++)
609			{
610			fcntl(socket_server[i], F_SETFL, flags[i]);
611	sysadm	1.13
612	sysadm	1.52	if (close(socket_server[i]) == -1)
613			{
614			log_error("Close server socket failed\n");
615			}
616	sysadm	1.13	}
617	sysadm	1.7
618	sysadm	1.51	ssh_bind_free(sshbind);
619			ssh_finalize();
620
621	sysadm	1.13	return 0;
622	sysadm	1.1	}
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