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;
        long int ssh_timeout = 0;
        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);

                ssh_timeout = 60; // second
                if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
                {
                        log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
                        goto cleanup;
                }

                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;
                }

                ssh_timeout = 0;
                if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
                {
                        log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
                        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;
        MENU_SET top10_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 bbs menu failed\n");
                        }
                        else
                        {
                                unload_menu(&bbs_menu);
                                memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
                                log_common("Reload bbs menu successfully\n");
                        }

                        if (load_menu(&top10_menu_new, CONF_TOP10_MENU) < 0)
                        {
                                unload_menu(&top10_menu_new);
                                log_error("Reload top10 menu failed\n");
                        }
                        else
                        {
                                unload_menu(&top10_menu);
                                top10_menu_new.allow_exit = 1;
                                memcpy(&top10_menu, &top10_menu_new, sizeof(top10_menu_new));
                                log_common("Reload top10 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	sysadm	1.71	long int ssh_timeout = 0;
129	sysadm	1.55	int pid;
130			int i;
131			int ret;
132
133			struct ssl_server_cb_data_t cb_data = {
134			.tries = 0,
135			.error = 0,
136			};
137
138			struct ssh_server_callbacks_struct cb = {
139			.userdata = &cb_data,
140			.auth_password_function = auth_password,
141			.channel_open_request_session_function = new_session_channel,
142			};
143
144			pid = fork();
145
146			if (pid > 0) // Parent process
147			{
148			SYS_child_process_count++;
149			log_common("Child process (%d) start\n", pid);
150			return pid;
151			}
152			else if (pid < 0) // Error
153			{
154			log_error("fork() error (%d)\n", errno);
155			return -1;
156			}
157
158			// Child process
159
160			if (close(socket_server[0]) == -1 \|\| close(socket_server[1]) == -1)
161			{
162			log_error("Close server socket failed\n");
163			}
164
165			SSH_session = ssh_new();
166
167			if (SSH_v2)
168			{
169			if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
170			{
171			log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
172			goto cleanup;
173			}
174
175			ssh_bind_free(sshbind);
176
177			ssh_callbacks_init(&cb);
178			ssh_set_server_callbacks(SSH_session, &cb);
179
180	sysadm	1.71	ssh_timeout = 60; // second
181			if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
182			{
183			log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
184			goto cleanup;
185			}
186
187	sysadm	1.55	if (ssh_handle_key_exchange(SSH_session))
188			{
189			log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
190			goto cleanup;
191			}
192			ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
193
194			event = ssh_event_new();
195			ssh_event_add_session(event, SSH_session);
196
197	sysadm	1.58	for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
198	sysadm	1.55	{
199	sysadm	1.58	ret = ssh_event_dopoll(event, 100); // 0.1 second
200	sysadm	1.55	if (ret == SSH_ERROR)
201			{
202			log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
203			goto cleanup;
204			}
205			}
206
207			if (cb_data.error)
208			{
209			log_error("SSH auth error, tried %d times\n", cb_data.tries);
210			goto cleanup;
211			}
212	sysadm	1.71
213			ssh_timeout = 0;
214			if (ssh_options_set(SSH_session, SSH_OPTIONS_TIMEOUT, &ssh_timeout) < 0)
215			{
216			log_error("Error setting SSH options: %s\n", ssh_get_error(SSH_session));
217			goto cleanup;
218			}
219	sysadm	1.55	}
220
221			// Redirect Input
222			close(STDIN_FILENO);
223			if (dup2(socket_client, STDIN_FILENO) == -1)
224			{
225			log_error("Redirect stdin to client socket failed\n");
226			goto cleanup;
227			}
228
229			// Redirect Output
230			close(STDOUT_FILENO);
231			if (dup2(socket_client, STDOUT_FILENO) == -1)
232			{
233			log_error("Redirect stdout to client socket failed\n");
234			goto cleanup;
235			}
236
237			SYS_child_process_count = 0;
238
239			bbs_main();
240
241			cleanup:
242			// Child process exit
243			SYS_server_exit = 1;
244
245			if (SSH_v2)
246			{
247			ssh_channel_free(SSH_channel);
248			ssh_disconnect(SSH_session);
249			}
250			else if (close(socket_client) == -1)
251			{
252			log_error("Close client socket failed\n");
253			}
254
255			ssh_free(SSH_session);
256			ssh_finalize();
257
258			// Close Input and Output for client
259			close(STDIN_FILENO);
260			close(STDOUT_FILENO);
261
262			log_common("Process exit normally\n");
263			log_end();
264
265			_exit(0);
266
267			return 0;
268			}
269
270	sysadm	1.52	int net_server(const char *hostaddr, in_port_t port[])
271	sysadm	1.1	{
272	sysadm	1.52	unsigned int addrlen;
273	sysadm	1.19	int ret;
274	sysadm	1.52	int flags[2];
275	sysadm	1.13	struct sockaddr_in sin;
276	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
277			int nfds, epollfd;
278	sysadm	1.19	siginfo_t siginfo;
279	sysadm	1.70	int notify_child_exit = 0;
280			time_t tm_notify_child_exit = time(NULL);
281	sysadm	1.31	int sd_notify_stopping = 0;
282	sysadm	1.66	MENU_SET bbs_menu_new;
283	sysadm	1.72	MENU_SET top10_menu_new;
284	sysadm	1.44	int i, j;
285			pid_t pid;
286	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
287	sysadm	1.10
288	sysadm	1.51	ssh_init();
289
290			sshbind = ssh_bind_new();
291
292			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
293			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
294			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
295	sysadm	1.63	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 \|\|
296	sysadm	1.51	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
297			{
298			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
299			ssh_bind_free(sshbind);
300			return -1;
301			}
302	sysadm	1.10
303	sysadm	1.52	epollfd = epoll_create1(0);
304			if (epollfd < 0)
305	sysadm	1.13	{
306	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
307	sysadm	1.27	return -1;
308	sysadm	1.13	}
309	sysadm	1.10
310	sysadm	1.52	// Server socket
311			for (i = 0; i < 2; i++)
312	sysadm	1.23	{
313	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
314	sysadm	1.23
315	sysadm	1.52	if (socket_server[i] < 0)
316			{
317			log_error("Create socket_server error (%d)\n", errno);
318			return -1;
319			}
320	sysadm	1.10
321	sysadm	1.52	sin.sin_family = AF_INET;
322			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
323			sin.sin_port = htons(port[i]);
324
325			// Reuse address and port
326			flags[i] = 1;
327			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
328			{
329			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
330			}
331			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
332			{
333			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
334			}
335	sysadm	1.1
336	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
337			{
338			log_error("Bind address %s:%u error (%d)\n",
339			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
340			return -1;
341			}
342	sysadm	1.16
343	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
344			{
345			log_error("Telnet socket listen error (%d)\n", errno);
346			return -1;
347			}
348	sysadm	1.13
349	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
350	sysadm	1.25
351	sysadm	1.52	ev.events = EPOLLIN;
352			ev.data.fd = socket_server[i];
353			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
354	sysadm	1.30	{
355	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
356			if (close(epollfd) < 0)
357			{
358			log_error("close(epoll) error (%d)\n");
359			}
360			return -1;
361	sysadm	1.30	}
362	sysadm	1.52
363			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
364			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
365	sysadm	1.25	}
366
367	sysadm	1.31	// Startup complete
368			sd_notifyf(0, "READY=1\n"
369	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
370	sysadm	1.31	"MAINPID=%d",
371	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
372	sysadm	1.31
373	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
374	sysadm	1.13	{
375	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
376			{
377			sd_notify(0, "STOPPING=1");
378			sd_notify_stopping = 1;
379			}
380	sysadm	1.37
381	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
382	sysadm	1.19	{
383	sysadm	1.30	SYS_child_exit = 0;
384
385	sysadm	1.19	siginfo.si_pid = 0;
386			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
387			if (ret == 0 && siginfo.si_pid > 0)
388			{
389	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
390
391	sysadm	1.19	SYS_child_process_count--;
392	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
393	sysadm	1.44
394	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
395	sysadm	1.44	{
396	sysadm	1.45	i = 0;
397			for (; i < BBS_max_client; i++)
398	sysadm	1.44	{
399	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
400			{
401			process_sockaddr_pool[i].pid = 0;
402			break;
403			}
404			}
405			if (i >= BBS_max_client)
406			{
407			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
408	sysadm	1.44	}
409			}
410	sysadm	1.19	}
411			else if (ret == 0)
412			{
413			break;
414			}
415			else if (ret < 0)
416			{
417			log_error("Error in waitid: %d\n", errno);
418			break;
419			}
420			}
421
422	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
423	sysadm	1.21	{
424	sysadm	1.70	if (notify_child_exit == 0)
425	sysadm	1.21	{
426	sysadm	1.70	sd_notifyf(0, "STATUS=Notify %d child process to exit", SYS_child_process_count);
427			log_common("Notify %d child process to exit\n", SYS_child_process_count);
428
429			if (kill(0, SIGTERM) < 0)
430			{
431			log_error("Send SIGTERM signal failed (%d)\n", errno);
432			}
433
434			notify_child_exit = 1;
435			tm_notify_child_exit = time(NULL);
436	sysadm	1.21	}
437	sysadm	1.70	else if (notify_child_exit == 1 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_EXIT_TIMEOUT)
438			{
439			sd_notifyf(0, "STATUS=Kill %d child process", SYS_child_process_count);
440	sysadm	1.31
441	sysadm	1.70	for (i = 0; i < BBS_max_client; i++)
442			{
443			if (process_sockaddr_pool[i].pid != 0)
444			{
445			log_error("Kill child process (pid=%d)\n", process_sockaddr_pool[i].pid);
446			if (kill(process_sockaddr_pool[i].pid, SIGKILL) < 0)
447			{
448			log_error("Send SIGKILL signal failed (%d)\n", errno);
449			}
450			}
451			}
452	sysadm	1.69
453	sysadm	1.70	notify_child_exit = 2;
454			tm_notify_child_exit = time(NULL);
455			}
456			else if (notify_child_exit == 2 && time(NULL) - tm_notify_child_exit >= WAIT_CHILD_PROCESS_KILL_TIMEOUT)
457			{
458			log_error("Main process prepare to exit without waiting for %d child process any longer\n", SYS_child_process_count);
459			SYS_child_process_count = 0;
460			}
461	sysadm	1.21	}
462
463	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
464	sysadm	1.19	{
465	sysadm	1.44	SYS_conf_reload = 0;
466	sysadm	1.37	sd_notify(0, "RELOADING=1");
467	sysadm	1.30
468	sysadm	1.44	// Reload configuration
469			if (load_conf(CONF_BBSD) < 0)
470			{
471			log_error("Reload conf failed\n");
472			}
473
474	sysadm	1.68	if (load_menu(&bbs_menu_new, CONF_MENU) < 0)
475	sysadm	1.34	{
476	sysadm	1.68	unload_menu(&bbs_menu_new);
477	sysadm	1.72	log_error("Reload bbs menu failed\n");
478	sysadm	1.19	}
479			else
480			{
481	sysadm	1.68	unload_menu(&bbs_menu);
482			memcpy(&bbs_menu, &bbs_menu_new, sizeof(bbs_menu_new));
483	sysadm	1.72	log_common("Reload bbs menu successfully\n");
484			}
485
486			if (load_menu(&top10_menu_new, CONF_TOP10_MENU) < 0)
487			{
488			unload_menu(&top10_menu_new);
489			log_error("Reload top10 menu failed\n");
490			}
491			else
492			{
493			unload_menu(&top10_menu);
494			top10_menu_new.allow_exit = 1;
495			memcpy(&top10_menu, &top10_menu_new, sizeof(top10_menu_new));
496			log_common("Reload top10 menu successfully\n");
497	sysadm	1.19	}
498	sysadm	1.37
499	sysadm	1.35	for (int i = 0; i < data_files_load_startup_count; i++)
500			{
501	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
502	sysadm	1.35	{
503			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
504			}
505			}
506	sysadm	1.49	log_common("Reload data files successfully\n");
507	sysadm	1.35
508	sysadm	1.68	// Load section config and gen_ex
509			if (load_section_config_from_db(1) < 0)
510			{
511			log_error("load_section_config_from_db(1) error\n");
512			}
513			else
514	sysadm	1.42	{
515	sysadm	1.68	log_common("Reload section config and gen_ex successfully\n");
516	sysadm	1.42	}
517	sysadm	1.68
518			sd_notify(0, "READY=1");
519	sysadm	1.42	}
520
521	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
522	sysadm	1.22
523	sysadm	1.25	if (nfds < 0)
524	sysadm	1.19	{
525			if (errno != EINTR)
526			{
527	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
528			break;
529	sysadm	1.19	}
530			continue;
531			}
532	sysadm	1.13
533	sysadm	1.19	// Stop accept new connection on exit
534			if (SYS_server_exit)
535	sysadm	1.13	{
536			continue;
537			}
538
539	sysadm	1.25	for (int i = 0; i < nfds; i++)
540	sysadm	1.13	{
541	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
542	sysadm	1.13	{
543	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
544	sysadm	1.52
545	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
546	sysadm	1.13	{
547	sysadm	1.52	addrlen = sizeof(sin);
548	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
549	sysadm	1.25	if (socket_client < 0)
550			{
551	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
552			{
553			break;
554			}
555			else if (errno == EINTR)
556			{
557			continue;
558			}
559			else
560	sysadm	1.25	{
561			log_error("accept(socket_server) error (%d)\n", errno);
562	sysadm	1.28	break;
563	sysadm	1.25	}
564			}
565
566			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
567			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
568
569			port_client = ntohs(sin.sin_port);
570
571	sysadm	1.64	log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
572	sysadm	1.25
573	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
574	sysadm	1.25	{
575	sysadm	1.44	j = 0;
576			for (i = 0; i < BBS_max_client; i++)
577			{
578			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
579			{
580			j++;
581			if (j >= BBS_max_client_per_ip)
582			{
583	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
584	sysadm	1.44	break;
585			}
586			}
587			}
588
589			if (j < BBS_max_client_per_ip)
590	sysadm	1.43	{
591	sysadm	1.52	if ((pid = fork_server()) < 0)
592	sysadm	1.44	{
593			log_error("fork_server() error\n");
594			}
595			else if (pid > 0)
596			{
597			i = 0;
598			for (; i < BBS_max_client; i++)
599			{
600			if (process_sockaddr_pool[i].pid == 0)
601			{
602			break;
603			}
604			}
605
606			if (i >= BBS_max_client)
607			{
608			log_error("Process sockaddr pool depleted\n");
609			}
610			else
611			{
612			process_sockaddr_pool[i].pid = pid;
613			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
614			}
615			}
616	sysadm	1.43	}
617			}
618			else
619			{
620			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
621	sysadm	1.25	}
622
623			if (close(socket_client) == -1)
624			{
625			log_error("close(socket_lient) error (%d)\n", errno);
626			}
627	sysadm	1.13	}
628			}
629			}
630	sysadm	1.25	}
631	sysadm	1.13
632	sysadm	1.30	if (close(epollfd) < 0)
633			{
634			log_error("close(epoll) error (%d)\n");
635			}
636
637	sysadm	1.52	for (i = 0; i < 2; i++)
638			{
639			fcntl(socket_server[i], F_SETFL, flags[i]);
640	sysadm	1.13
641	sysadm	1.52	if (close(socket_server[i]) == -1)
642			{
643			log_error("Close server socket failed\n");
644			}
645	sysadm	1.13	}
646	sysadm	1.7
647	sysadm	1.51	ssh_bind_free(sshbind);
648			ssh_finalize();
649
650	sysadm	1.13	return 0;
651	sysadm	1.1	}
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