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 "net_server.h"
#include "common.h"
#include "bbs_main.h"
#include "bbs.h"
#include "log.h"
#include "io.h"
#include "init.h"
#include "menu.h"
#include "database.h"
#include "login.h"
#include "file_loader.h"
#include "section_list_loader.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <libssh/libssh.h>
#include <libssh/server.h>
#include <libssh/callbacks.h>
#include <sys/epoll.h>
#include <sys/syscall.h>
#include <sys/socket.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_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("ksection_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 %sconnection from %s:%d\n", (SSH_v2 ? "" : "SSH2 "), 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	1.14	#include "net_server.h"
18	sysadm	1.1	#include "common.h"
19	sysadm	1.55	#include "bbs_main.h"
20			#include "bbs.h"
21	sysadm	1.14	#include "log.h"
22	sysadm	1.7	#include "io.h"
23	sysadm	1.44	#include "init.h"
24	sysadm	1.19	#include "menu.h"
25	sysadm	1.55	#include "database.h"
26			#include "login.h"
27	sysadm	1.35	#include "file_loader.h"
28	sysadm	1.42	#include "section_list_loader.h"
29	sysadm	1.20	#include <errno.h>
30			#include <fcntl.h>
31			#include <string.h>
32	sysadm	1.19	#include <signal.h>
33	sysadm	1.20	#include <stdlib.h>
34	sysadm	1.19	#include <unistd.h>
35	sysadm	1.9	#include <arpa/inet.h>
36	sysadm	1.47	#include <netinet/in.h>
37	sysadm	1.55	#include <libssh/libssh.h>
38			#include <libssh/server.h>
39			#include <libssh/callbacks.h>
40	sysadm	1.61	#include <sys/epoll.h>
41			#include <sys/syscall.h>
42			#include <sys/socket.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			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
274			{
275			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
276			ssh_bind_free(sshbind);
277			return -1;
278			}
279	sysadm	1.10
280	sysadm	1.52	epollfd = epoll_create1(0);
281			if (epollfd < 0)
282	sysadm	1.13	{
283	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
284	sysadm	1.27	return -1;
285	sysadm	1.13	}
286	sysadm	1.10
287	sysadm	1.52	// Server socket
288			for (i = 0; i < 2; i++)
289	sysadm	1.23	{
290	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
291	sysadm	1.23
292	sysadm	1.52	if (socket_server[i] < 0)
293			{
294			log_error("Create socket_server error (%d)\n", errno);
295			return -1;
296			}
297	sysadm	1.10
298	sysadm	1.52	sin.sin_family = AF_INET;
299			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
300			sin.sin_port = htons(port[i]);
301
302			// Reuse address and port
303			flags[i] = 1;
304			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
305			{
306			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
307			}
308			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
309			{
310			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
311			}
312	sysadm	1.1
313	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
314			{
315			log_error("Bind address %s:%u error (%d)\n",
316			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
317			return -1;
318			}
319	sysadm	1.16
320	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
321			{
322			log_error("Telnet socket listen error (%d)\n", errno);
323			return -1;
324			}
325	sysadm	1.13
326	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
327	sysadm	1.25
328	sysadm	1.52	ev.events = EPOLLIN;
329			ev.data.fd = socket_server[i];
330			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
331	sysadm	1.30	{
332	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
333			if (close(epollfd) < 0)
334			{
335			log_error("close(epoll) error (%d)\n");
336			}
337			return -1;
338	sysadm	1.30	}
339	sysadm	1.52
340			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
341			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
342	sysadm	1.25	}
343
344	sysadm	1.31	// Startup complete
345			sd_notifyf(0, "READY=1\n"
346	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
347	sysadm	1.31	"MAINPID=%d",
348	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
349	sysadm	1.31
350	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
351	sysadm	1.13	{
352	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
353			{
354			sd_notify(0, "STOPPING=1");
355			sd_notify_stopping = 1;
356			}
357	sysadm	1.37
358	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
359	sysadm	1.19	{
360	sysadm	1.30	SYS_child_exit = 0;
361
362	sysadm	1.19	siginfo.si_pid = 0;
363			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
364			if (ret == 0 && siginfo.si_pid > 0)
365			{
366	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
367
368	sysadm	1.19	SYS_child_process_count--;
369	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
370	sysadm	1.44
371	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
372	sysadm	1.44	{
373	sysadm	1.45	i = 0;
374			for (; i < BBS_max_client; i++)
375	sysadm	1.44	{
376	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
377			{
378			process_sockaddr_pool[i].pid = 0;
379			break;
380			}
381			}
382			if (i >= BBS_max_client)
383			{
384			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
385	sysadm	1.44	}
386			}
387	sysadm	1.19	}
388			else if (ret == 0)
389			{
390			break;
391			}
392			else if (ret < 0)
393			{
394			log_error("Error in waitid: %d\n", errno);
395			break;
396			}
397			}
398
399	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
400	sysadm	1.21	{
401	sysadm	1.49	log_common("Notify %d child process to exit\n", SYS_child_process_count);
402	sysadm	1.21	if (kill(0, SIGTERM) < 0)
403			{
404			log_error("Send SIGTERM signal failed (%d)\n", errno);
405			}
406	sysadm	1.31
407			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
408	sysadm	1.21	}
409
410	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
411	sysadm	1.19	{
412	sysadm	1.44	SYS_conf_reload = 0;
413	sysadm	1.37	sd_notify(0, "RELOADING=1");
414	sysadm	1.30
415	sysadm	1.44	// Reload configuration
416			if (load_conf(CONF_BBSD) < 0)
417			{
418			log_error("Reload conf failed\n");
419			}
420
421	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
422			if (p_bbs_menu_new == NULL)
423			{
424			log_error("OOM: calloc(MENU_SET)\n");
425			}
426			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
427			{
428			unload_menu(p_bbs_menu_new);
429			free(p_bbs_menu_new);
430	sysadm	1.38	p_bbs_menu_new = NULL;
431	sysadm	1.33
432	sysadm	1.19	log_error("Reload menu failed\n");
433			}
434			else
435			{
436	sysadm	1.34	unload_menu(p_bbs_menu);
437			free(p_bbs_menu);
438
439			p_bbs_menu = p_bbs_menu_new;
440			p_bbs_menu_new = NULL;
441
442	sysadm	1.49	log_common("Reload menu successfully\n");
443	sysadm	1.19	}
444	sysadm	1.37
445			sd_notify(0, "READY=1");
446	sysadm	1.19	}
447
448	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
449			{
450			SYS_data_file_reload = 0;
451	sysadm	1.37	sd_notify(0, "RELOADING=1");
452	sysadm	1.35
453			for (int i = 0; i < data_files_load_startup_count; i++)
454			{
455	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
456	sysadm	1.35	{
457			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
458			}
459			}
460
461	sysadm	1.49	log_common("Reload data files successfully\n");
462	sysadm	1.37	sd_notify(0, "READY=1");
463	sysadm	1.35	}
464
465	sysadm	1.42	if (SYS_section_list_reload && !SYS_server_exit)
466			{
467			SYS_section_list_reload = 0;
468
469			if (section_list_loader_reload() < 0)
470			{
471			log_error("ksection_list_loader_reload() failed\n");
472			}
473			}
474
475	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
476	sysadm	1.22
477	sysadm	1.25	if (nfds < 0)
478	sysadm	1.19	{
479			if (errno != EINTR)
480			{
481	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
482			break;
483	sysadm	1.19	}
484			continue;
485			}
486	sysadm	1.13
487	sysadm	1.19	// Stop accept new connection on exit
488			if (SYS_server_exit)
489	sysadm	1.13	{
490			continue;
491			}
492
493	sysadm	1.25	for (int i = 0; i < nfds; i++)
494	sysadm	1.13	{
495	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
496	sysadm	1.13	{
497	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
498	sysadm	1.52
499	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
500	sysadm	1.13	{
501	sysadm	1.52	addrlen = sizeof(sin);
502	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
503	sysadm	1.25	if (socket_client < 0)
504			{
505	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
506			{
507			break;
508			}
509			else if (errno == EINTR)
510			{
511			continue;
512			}
513			else
514	sysadm	1.25	{
515			log_error("accept(socket_server) error (%d)\n", errno);
516	sysadm	1.28	break;
517	sysadm	1.25	}
518			}
519
520			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
521			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
522
523			port_client = ntohs(sin.sin_port);
524
525	sysadm	1.54	log_common("Accept %sconnection from %s:%d\n", (SSH_v2 ? "" : "SSH2 "), hostaddr_client, port_client);
526	sysadm	1.25
527	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
528	sysadm	1.25	{
529	sysadm	1.44	j = 0;
530			for (i = 0; i < BBS_max_client; i++)
531			{
532			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
533			{
534			j++;
535			if (j >= BBS_max_client_per_ip)
536			{
537	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
538	sysadm	1.44	break;
539			}
540			}
541			}
542
543			if (j < BBS_max_client_per_ip)
544	sysadm	1.43	{
545	sysadm	1.52	if ((pid = fork_server()) < 0)
546	sysadm	1.44	{
547			log_error("fork_server() error\n");
548			}
549			else if (pid > 0)
550			{
551			i = 0;
552			for (; i < BBS_max_client; i++)
553			{
554			if (process_sockaddr_pool[i].pid == 0)
555			{
556			break;
557			}
558			}
559
560			if (i >= BBS_max_client)
561			{
562			log_error("Process sockaddr pool depleted\n");
563			}
564			else
565			{
566			process_sockaddr_pool[i].pid = pid;
567			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
568			}
569			}
570	sysadm	1.43	}
571			}
572			else
573			{
574			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
575	sysadm	1.25	}
576
577			if (close(socket_client) == -1)
578			{
579			log_error("close(socket_lient) error (%d)\n", errno);
580			}
581	sysadm	1.13	}
582			}
583			}
584	sysadm	1.25	}
585	sysadm	1.13
586	sysadm	1.30	if (close(epollfd) < 0)
587			{
588			log_error("close(epoll) error (%d)\n");
589			}
590
591	sysadm	1.52	for (i = 0; i < 2; i++)
592			{
593			fcntl(socket_server[i], F_SETFL, flags[i]);
594	sysadm	1.13
595	sysadm	1.52	if (close(socket_server[i]) == -1)
596			{
597			log_error("Close server socket failed\n");
598			}
599	sysadm	1.13	}
600	sysadm	1.7
601	sysadm	1.51	ssh_bind_free(sshbind);
602			ssh_finalize();
603
604	sysadm	1.13	return 0;
605	sysadm	1.1	}
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