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_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 *p_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");
                        }

                        p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
                        if (p_bbs_menu_new == NULL)
                        {
                                log_error("OOM: calloc(MENU_SET)\n");
                        }
                        else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
                        {
                                unload_menu(p_bbs_menu_new);
                                free(p_bbs_menu_new);
                                p_bbs_menu_new = NULL;

                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                unload_menu(p_bbs_menu);
                                free(p_bbs_menu);

                                p_bbs_menu = p_bbs_menu_new;
                                p_bbs_menu_new = NULL;

                                log_common("Reload menu successfully\n");
                        }

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

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

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

                if (SYS_section_list_reload && !SYS_server_exit)
                {
                        SYS_section_list_reload = 0;

                        if (section_list_loader_reload() < 0)
                        {
                                log_error("section_list_loader_reload() failed\n");
                        }
                }

                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	1.42	#include "section_list_loader.h"
29	sysadm	1.20	#include <errno.h>
30			#include <fcntl.h>
31	sysadm	1.19	#include <signal.h>
32	sysadm	1.20	#include <stdlib.h>
33	sysadm	1.62	#include <string.h>
34	sysadm	1.19	#include <unistd.h>
35	sysadm	1.9	#include <arpa/inet.h>
36	sysadm	1.62	#include <libssh/callbacks.h>
37	sysadm	1.55	#include <libssh/libssh.h>
38			#include <libssh/server.h>
39	sysadm	1.62	#include <netinet/in.h>
40	sysadm	1.61	#include <sys/epoll.h>
41	sysadm	1.62	#include <sys/socket.h>
42	sysadm	1.61	#include <sys/syscall.h>
43			#include <sys/types.h>
44			#include <sys/wait.h>
45			#include <systemd/sd-daemon.h>
46	sysadm	1.3
47	sysadm	1.44	struct process_sockaddr_t
48			{
49			pid_t pid;
50			in_addr_t s_addr;
51			};
52			typedef struct process_sockaddr_t PROCESS_SOCKADDR;
53
54	sysadm	1.48	static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
55	sysadm	1.44
56	sysadm	1.58	#define SSH_AUTH_MAX_DURATION (60 * 1000) // milliseconds
57	sysadm	1.55
58			struct ssl_server_cb_data_t
59			{
60			int tries;
61			int error;
62			};
63
64			static int auth_password(ssh_session session, const char *user,
65			const char password, void userdata)
66			{
67			struct ssl_server_cb_data_t *p_data = userdata;
68			int ret;
69
70			if (strcmp(user, "guest") == 0)
71			{
72	sysadm	1.57	ret = load_guest_info();
73	sysadm	1.55	}
74			else
75			{
76	sysadm	1.57	ret = check_user(user, password);
77	sysadm	1.55	}
78
79			if (ret == 0)
80			{
81			return SSH_AUTH_SUCCESS;
82			}
83
84			if ((++(p_data->tries)) >= BBS_login_retry_times)
85			{
86			p_data->error = 1;
87			}
88
89			return SSH_AUTH_DENIED;
90			}
91
92			static int pty_request(ssh_session session, ssh_channel channel, const char *term,
93			int x, int y, int px, int py, void *userdata)
94			{
95			return 0;
96			}
97
98			static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
99			{
100			return 0;
101			}
102
103			static struct ssh_channel_callbacks_struct channel_cb = {
104			.channel_pty_request_function = pty_request,
105			.channel_shell_request_function = shell_request};
106
107			static ssh_channel new_session_channel(ssh_session session, void *userdata)
108			{
109			if (SSH_channel != NULL)
110			{
111			return NULL;
112			}
113
114			SSH_channel = ssh_channel_new(session);
115			ssh_callbacks_init(&channel_cb);
116			ssh_set_channel_callbacks(SSH_channel, &channel_cb);
117
118			return SSH_channel;
119			}
120
121	sysadm	1.56	static int fork_server(void)
122	sysadm	1.55	{
123			ssh_event event;
124			int pid;
125			int i;
126			int ret;
127
128			struct ssl_server_cb_data_t cb_data = {
129			.tries = 0,
130			.error = 0,
131			};
132
133			struct ssh_server_callbacks_struct cb = {
134			.userdata = &cb_data,
135			.auth_password_function = auth_password,
136			.channel_open_request_session_function = new_session_channel,
137			};
138
139			pid = fork();
140
141			if (pid > 0) // Parent process
142			{
143			SYS_child_process_count++;
144			log_common("Child process (%d) start\n", pid);
145			return pid;
146			}
147			else if (pid < 0) // Error
148			{
149			log_error("fork() error (%d)\n", errno);
150			return -1;
151			}
152
153			// Child process
154
155			if (close(socket_server[0]) == -1 \|\| close(socket_server[1]) == -1)
156			{
157			log_error("Close server socket failed\n");
158			}
159
160			SSH_session = ssh_new();
161
162			if (SSH_v2)
163			{
164			if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
165			{
166			log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
167			goto cleanup;
168			}
169
170			ssh_bind_free(sshbind);
171
172			ssh_callbacks_init(&cb);
173			ssh_set_server_callbacks(SSH_session, &cb);
174
175			if (ssh_handle_key_exchange(SSH_session))
176			{
177			log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
178			goto cleanup;
179			}
180			ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
181
182			event = ssh_event_new();
183			ssh_event_add_session(event, SSH_session);
184
185	sysadm	1.58	for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i += 100)
186	sysadm	1.55	{
187	sysadm	1.58	ret = ssh_event_dopoll(event, 100); // 0.1 second
188	sysadm	1.55	if (ret == SSH_ERROR)
189			{
190			log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
191			goto cleanup;
192			}
193			}
194
195			if (cb_data.error)
196			{
197			log_error("SSH auth error, tried %d times\n", cb_data.tries);
198			goto cleanup;
199			}
200			}
201
202			// Redirect Input
203			close(STDIN_FILENO);
204			if (dup2(socket_client, STDIN_FILENO) == -1)
205			{
206			log_error("Redirect stdin to client socket failed\n");
207			goto cleanup;
208			}
209
210			// Redirect Output
211			close(STDOUT_FILENO);
212			if (dup2(socket_client, STDOUT_FILENO) == -1)
213			{
214			log_error("Redirect stdout to client socket failed\n");
215			goto cleanup;
216			}
217
218			SYS_child_process_count = 0;
219
220			bbs_main();
221
222			cleanup:
223			// Child process exit
224			SYS_server_exit = 1;
225
226			if (SSH_v2)
227			{
228			ssh_channel_free(SSH_channel);
229			ssh_disconnect(SSH_session);
230			}
231			else if (close(socket_client) == -1)
232			{
233			log_error("Close client socket failed\n");
234			}
235
236			ssh_free(SSH_session);
237			ssh_finalize();
238
239			// Close Input and Output for client
240			close(STDIN_FILENO);
241			close(STDOUT_FILENO);
242
243			log_common("Process exit normally\n");
244			log_end();
245
246			_exit(0);
247
248			return 0;
249			}
250
251	sysadm	1.52	int net_server(const char *hostaddr, in_port_t port[])
252	sysadm	1.1	{
253	sysadm	1.52	unsigned int addrlen;
254	sysadm	1.19	int ret;
255	sysadm	1.52	int flags[2];
256	sysadm	1.13	struct sockaddr_in sin;
257	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
258			int nfds, epollfd;
259	sysadm	1.19	siginfo_t siginfo;
260	sysadm	1.31	int sd_notify_stopping = 0;
261	sysadm	1.34	MENU_SET *p_bbs_menu_new;
262	sysadm	1.44	int i, j;
263			pid_t pid;
264	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
265	sysadm	1.10
266	sysadm	1.51	ssh_init();
267
268			sshbind = ssh_bind_new();
269
270			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
271			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
272			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
273	sysadm	1.63	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256") < 0 \|\|
274	sysadm	1.51	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
275			{
276			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
277			ssh_bind_free(sshbind);
278			return -1;
279			}
280	sysadm	1.10
281	sysadm	1.52	epollfd = epoll_create1(0);
282			if (epollfd < 0)
283	sysadm	1.13	{
284	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
285	sysadm	1.27	return -1;
286	sysadm	1.13	}
287	sysadm	1.10
288	sysadm	1.52	// Server socket
289			for (i = 0; i < 2; i++)
290	sysadm	1.23	{
291	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
292	sysadm	1.23
293	sysadm	1.52	if (socket_server[i] < 0)
294			{
295			log_error("Create socket_server error (%d)\n", errno);
296			return -1;
297			}
298	sysadm	1.10
299	sysadm	1.52	sin.sin_family = AF_INET;
300			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
301			sin.sin_port = htons(port[i]);
302
303			// Reuse address and port
304			flags[i] = 1;
305			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
306			{
307			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
308			}
309			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
310			{
311			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
312			}
313	sysadm	1.1
314	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
315			{
316			log_error("Bind address %s:%u error (%d)\n",
317			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
318			return -1;
319			}
320	sysadm	1.16
321	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
322			{
323			log_error("Telnet socket listen error (%d)\n", errno);
324			return -1;
325			}
326	sysadm	1.13
327	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
328	sysadm	1.25
329	sysadm	1.52	ev.events = EPOLLIN;
330			ev.data.fd = socket_server[i];
331			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
332	sysadm	1.30	{
333	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
334			if (close(epollfd) < 0)
335			{
336			log_error("close(epoll) error (%d)\n");
337			}
338			return -1;
339	sysadm	1.30	}
340	sysadm	1.52
341			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
342			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
343	sysadm	1.25	}
344
345	sysadm	1.31	// Startup complete
346			sd_notifyf(0, "READY=1\n"
347	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
348	sysadm	1.31	"MAINPID=%d",
349	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
350	sysadm	1.31
351	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
352	sysadm	1.13	{
353	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
354			{
355			sd_notify(0, "STOPPING=1");
356			sd_notify_stopping = 1;
357			}
358	sysadm	1.37
359	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
360	sysadm	1.19	{
361	sysadm	1.30	SYS_child_exit = 0;
362
363	sysadm	1.19	siginfo.si_pid = 0;
364			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
365			if (ret == 0 && siginfo.si_pid > 0)
366			{
367	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
368
369	sysadm	1.19	SYS_child_process_count--;
370	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
371	sysadm	1.44
372	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
373	sysadm	1.44	{
374	sysadm	1.45	i = 0;
375			for (; i < BBS_max_client; i++)
376	sysadm	1.44	{
377	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
378			{
379			process_sockaddr_pool[i].pid = 0;
380			break;
381			}
382			}
383			if (i >= BBS_max_client)
384			{
385			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
386	sysadm	1.44	}
387			}
388	sysadm	1.19	}
389			else if (ret == 0)
390			{
391			break;
392			}
393			else if (ret < 0)
394			{
395			log_error("Error in waitid: %d\n", errno);
396			break;
397			}
398			}
399
400	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
401	sysadm	1.21	{
402	sysadm	1.49	log_common("Notify %d child process to exit\n", SYS_child_process_count);
403	sysadm	1.21	if (kill(0, SIGTERM) < 0)
404			{
405			log_error("Send SIGTERM signal failed (%d)\n", errno);
406			}
407	sysadm	1.31
408			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
409	sysadm	1.21	}
410
411	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
412	sysadm	1.19	{
413	sysadm	1.44	SYS_conf_reload = 0;
414	sysadm	1.37	sd_notify(0, "RELOADING=1");
415	sysadm	1.30
416	sysadm	1.44	// Reload configuration
417			if (load_conf(CONF_BBSD) < 0)
418			{
419			log_error("Reload conf failed\n");
420			}
421
422	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
423			if (p_bbs_menu_new == NULL)
424			{
425			log_error("OOM: calloc(MENU_SET)\n");
426			}
427			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
428			{
429			unload_menu(p_bbs_menu_new);
430			free(p_bbs_menu_new);
431	sysadm	1.38	p_bbs_menu_new = NULL;
432	sysadm	1.33
433	sysadm	1.19	log_error("Reload menu failed\n");
434			}
435			else
436			{
437	sysadm	1.34	unload_menu(p_bbs_menu);
438			free(p_bbs_menu);
439
440			p_bbs_menu = p_bbs_menu_new;
441			p_bbs_menu_new = NULL;
442
443	sysadm	1.49	log_common("Reload menu successfully\n");
444	sysadm	1.19	}
445	sysadm	1.37
446			sd_notify(0, "READY=1");
447	sysadm	1.19	}
448
449	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
450			{
451			SYS_data_file_reload = 0;
452	sysadm	1.37	sd_notify(0, "RELOADING=1");
453	sysadm	1.35
454			for (int i = 0; i < data_files_load_startup_count; i++)
455			{
456	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
457	sysadm	1.35	{
458			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
459			}
460			}
461
462	sysadm	1.49	log_common("Reload data files successfully\n");
463	sysadm	1.37	sd_notify(0, "READY=1");
464	sysadm	1.35	}
465
466	sysadm	1.42	if (SYS_section_list_reload && !SYS_server_exit)
467			{
468			SYS_section_list_reload = 0;
469
470			if (section_list_loader_reload() < 0)
471			{
472	sysadm	1.65	log_error("section_list_loader_reload() failed\n");
473	sysadm	1.42	}
474			}
475
476	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
477	sysadm	1.22
478	sysadm	1.25	if (nfds < 0)
479	sysadm	1.19	{
480			if (errno != EINTR)
481			{
482	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
483			break;
484	sysadm	1.19	}
485			continue;
486			}
487	sysadm	1.13
488	sysadm	1.19	// Stop accept new connection on exit
489			if (SYS_server_exit)
490	sysadm	1.13	{
491			continue;
492			}
493
494	sysadm	1.25	for (int i = 0; i < nfds; i++)
495	sysadm	1.13	{
496	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
497	sysadm	1.13	{
498	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
499	sysadm	1.52
500	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
501	sysadm	1.13	{
502	sysadm	1.52	addrlen = sizeof(sin);
503	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
504	sysadm	1.25	if (socket_client < 0)
505			{
506	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
507			{
508			break;
509			}
510			else if (errno == EINTR)
511			{
512			continue;
513			}
514			else
515	sysadm	1.25	{
516			log_error("accept(socket_server) error (%d)\n", errno);
517	sysadm	1.28	break;
518	sysadm	1.25	}
519			}
520
521			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
522			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
523
524			port_client = ntohs(sin.sin_port);
525
526	sysadm	1.64	log_common("Accept %s connection from %s:%d\n", (SSH_v2 ? "SSH" : "telnet"), hostaddr_client, port_client);
527	sysadm	1.25
528	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
529	sysadm	1.25	{
530	sysadm	1.44	j = 0;
531			for (i = 0; i < BBS_max_client; i++)
532			{
533			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
534			{
535			j++;
536			if (j >= BBS_max_client_per_ip)
537			{
538	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
539	sysadm	1.44	break;
540			}
541			}
542			}
543
544			if (j < BBS_max_client_per_ip)
545	sysadm	1.43	{
546	sysadm	1.52	if ((pid = fork_server()) < 0)
547	sysadm	1.44	{
548			log_error("fork_server() error\n");
549			}
550			else if (pid > 0)
551			{
552			i = 0;
553			for (; i < BBS_max_client; i++)
554			{
555			if (process_sockaddr_pool[i].pid == 0)
556			{
557			break;
558			}
559			}
560
561			if (i >= BBS_max_client)
562			{
563			log_error("Process sockaddr pool depleted\n");
564			}
565			else
566			{
567			process_sockaddr_pool[i].pid = pid;
568			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
569			}
570			}
571	sysadm	1.43	}
572			}
573			else
574			{
575			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
576	sysadm	1.25	}
577
578			if (close(socket_client) == -1)
579			{
580			log_error("close(socket_lient) error (%d)\n", errno);
581			}
582	sysadm	1.13	}
583			}
584			}
585	sysadm	1.25	}
586	sysadm	1.13
587	sysadm	1.30	if (close(epollfd) < 0)
588			{
589			log_error("close(epoll) error (%d)\n");
590			}
591
592	sysadm	1.52	for (i = 0; i < 2; i++)
593			{
594			fcntl(socket_server[i], F_SETFL, flags[i]);
595	sysadm	1.13
596	sysadm	1.52	if (close(socket_server[i]) == -1)
597			{
598			log_error("Close server socket failed\n");
599			}
600	sysadm	1.13	}
601	sysadm	1.7
602	sysadm	1.51	ssh_bind_free(sshbind);
603			ssh_finalize();
604
605	sysadm	1.13	return 0;
606	sysadm	1.1	}
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