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>

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 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)
                {
                        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);
                        }

                        sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
                }

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