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.                                   *
 *                                                                         *
 ***************************************************************************/

#define _XOPEN_SOURCE 500
#define _POSIX_C_SOURCE 200809L
#define _GNU_SOURCE

#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 <sys/syscall.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <systemd/sd-daemon.h>
#include <libssh/libssh.h>
#include <libssh/server.h>
#include <libssh/callbacks.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 // seconds

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)
{
        MYSQL *db;
        struct ssl_server_cb_data_t *p_data = userdata;
        int ret;

        if ((db = db_open()) == NULL)
        {
                return SSH_AUTH_ERROR;
        }

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

        mysql_close(db);

        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;
}

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++)
                {
                        ret = ssh_event_dopoll(event, 1000); // 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	1.19	#define _XOPEN_SOURCE 500
18			#define _POSIX_C_SOURCE 200809L
19			#define _GNU_SOURCE
20
21	sysadm	1.14	#include "net_server.h"
22	sysadm	1.1	#include "common.h"
23	sysadm	1.55	#include "bbs_main.h"
24			#include "bbs.h"
25	sysadm	1.14	#include "log.h"
26	sysadm	1.7	#include "io.h"
27	sysadm	1.44	#include "init.h"
28	sysadm	1.19	#include "menu.h"
29	sysadm	1.55	#include "database.h"
30			#include "login.h"
31	sysadm	1.35	#include "file_loader.h"
32	sysadm	1.42	#include "section_list_loader.h"
33	sysadm	1.20	#include <errno.h>
34			#include <fcntl.h>
35			#include <string.h>
36	sysadm	1.19	#include <signal.h>
37	sysadm	1.20	#include <stdlib.h>
38	sysadm	1.19	#include <unistd.h>
39			#include <sys/syscall.h>
40	sysadm	1.7	#include <sys/socket.h>
41	sysadm	1.19	#include <sys/wait.h>
42	sysadm	1.25	#include <sys/epoll.h>
43	sysadm	1.9	#include <arpa/inet.h>
44	sysadm	1.47	#include <netinet/in.h>
45	sysadm	1.31	#include <systemd/sd-daemon.h>
46	sysadm	1.55	#include <libssh/libssh.h>
47			#include <libssh/server.h>
48			#include <libssh/callbacks.h>
49	sysadm	1.3
50	sysadm	1.44	struct process_sockaddr_t
51			{
52			pid_t pid;
53			in_addr_t s_addr;
54			};
55			typedef struct process_sockaddr_t PROCESS_SOCKADDR;
56
57	sysadm	1.48	static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
58	sysadm	1.44
59	sysadm	1.55	#define SSH_AUTH_MAX_DURATION 60 // seconds
60
61			struct ssl_server_cb_data_t
62			{
63			int tries;
64			int error;
65			};
66
67			static int auth_password(ssh_session session, const char *user,
68			const char password, void userdata)
69			{
70			MYSQL *db;
71			struct ssl_server_cb_data_t *p_data = userdata;
72			int ret;
73
74			if ((db = db_open()) == NULL)
75			{
76			return SSH_AUTH_ERROR;
77			}
78
79			if (strcmp(user, "guest") == 0)
80			{
81			ret = load_guest_info(db);
82			}
83			else
84			{
85			ret = check_user(db, user, password);
86			}
87
88			mysql_close(db);
89
90			if (ret == 0)
91			{
92			return SSH_AUTH_SUCCESS;
93			}
94
95			if ((++(p_data->tries)) >= BBS_login_retry_times)
96			{
97			p_data->error = 1;
98			}
99
100			return SSH_AUTH_DENIED;
101			}
102
103			static int pty_request(ssh_session session, ssh_channel channel, const char *term,
104			int x, int y, int px, int py, void *userdata)
105			{
106			return 0;
107			}
108
109			static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
110			{
111			return 0;
112			}
113
114			static struct ssh_channel_callbacks_struct channel_cb = {
115			.channel_pty_request_function = pty_request,
116			.channel_shell_request_function = shell_request};
117
118			static ssh_channel new_session_channel(ssh_session session, void *userdata)
119			{
120			if (SSH_channel != NULL)
121			{
122			return NULL;
123			}
124
125			SSH_channel = ssh_channel_new(session);
126			ssh_callbacks_init(&channel_cb);
127			ssh_set_channel_callbacks(SSH_channel, &channel_cb);
128
129			return SSH_channel;
130			}
131
132			int fork_server(void)
133			{
134			ssh_event event;
135			int pid;
136			int i;
137			int ret;
138
139			struct ssl_server_cb_data_t cb_data = {
140			.tries = 0,
141			.error = 0,
142			};
143
144			struct ssh_server_callbacks_struct cb = {
145			.userdata = &cb_data,
146			.auth_password_function = auth_password,
147			.channel_open_request_session_function = new_session_channel,
148			};
149
150			pid = fork();
151
152			if (pid > 0) // Parent process
153			{
154			SYS_child_process_count++;
155			log_common("Child process (%d) start\n", pid);
156			return pid;
157			}
158			else if (pid < 0) // Error
159			{
160			log_error("fork() error (%d)\n", errno);
161			return -1;
162			}
163
164			// Child process
165
166			if (close(socket_server[0]) == -1 \|\| close(socket_server[1]) == -1)
167			{
168			log_error("Close server socket failed\n");
169			}
170
171			SSH_session = ssh_new();
172
173			if (SSH_v2)
174			{
175			if (ssh_bind_accept_fd(sshbind, SSH_session, socket_client) != SSH_OK)
176			{
177			log_error("ssh_bind_accept_fd() error: %s\n", ssh_get_error(SSH_session));
178			goto cleanup;
179			}
180
181			ssh_bind_free(sshbind);
182
183			ssh_callbacks_init(&cb);
184			ssh_set_server_callbacks(SSH_session, &cb);
185
186			if (ssh_handle_key_exchange(SSH_session))
187			{
188			log_error("ssh_handle_key_exchange() error: %s\n", ssh_get_error(SSH_session));
189			goto cleanup;
190			}
191			ssh_set_auth_methods(SSH_session, SSH_AUTH_METHOD_PASSWORD);
192
193			event = ssh_event_new();
194			ssh_event_add_session(event, SSH_session);
195
196			for (i = 0; i < SSH_AUTH_MAX_DURATION && !SYS_server_exit && !cb_data.error && SSH_channel == NULL; i++)
197			{
198			ret = ssh_event_dopoll(event, 1000); // 1 second
199			if (ret == SSH_ERROR)
200			{
201			log_error("ssh_event_dopoll() error: %s\n", ssh_get_error(SSH_session));
202			goto cleanup;
203			}
204			}
205
206			if (cb_data.error)
207			{
208			log_error("SSH auth error, tried %d times\n", cb_data.tries);
209			goto cleanup;
210			}
211			}
212
213			// Redirect Input
214			close(STDIN_FILENO);
215			if (dup2(socket_client, STDIN_FILENO) == -1)
216			{
217			log_error("Redirect stdin to client socket failed\n");
218			goto cleanup;
219			}
220
221			// Redirect Output
222			close(STDOUT_FILENO);
223			if (dup2(socket_client, STDOUT_FILENO) == -1)
224			{
225			log_error("Redirect stdout to client socket failed\n");
226			goto cleanup;
227			}
228
229			SYS_child_process_count = 0;
230
231			bbs_main();
232
233			cleanup:
234			// Child process exit
235			SYS_server_exit = 1;
236
237			if (SSH_v2)
238			{
239			ssh_channel_free(SSH_channel);
240			ssh_disconnect(SSH_session);
241			}
242			else if (close(socket_client) == -1)
243			{
244			log_error("Close client socket failed\n");
245			}
246
247			ssh_free(SSH_session);
248			ssh_finalize();
249
250			// Close Input and Output for client
251			close(STDIN_FILENO);
252			close(STDOUT_FILENO);
253
254			log_common("Process exit normally\n");
255			log_end();
256
257			_exit(0);
258
259			return 0;
260			}
261
262	sysadm	1.52	int net_server(const char *hostaddr, in_port_t port[])
263	sysadm	1.1	{
264	sysadm	1.52	unsigned int addrlen;
265	sysadm	1.19	int ret;
266	sysadm	1.52	int flags[2];
267	sysadm	1.13	struct sockaddr_in sin;
268	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
269			int nfds, epollfd;
270	sysadm	1.19	siginfo_t siginfo;
271	sysadm	1.31	int sd_notify_stopping = 0;
272	sysadm	1.34	MENU_SET *p_bbs_menu_new;
273	sysadm	1.44	int i, j;
274			pid_t pid;
275	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
276	sysadm	1.10
277	sysadm	1.51	ssh_init();
278
279			sshbind = ssh_bind_new();
280
281			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
282			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
283			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
284			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
285			{
286			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
287			ssh_bind_free(sshbind);
288			return -1;
289			}
290	sysadm	1.10
291	sysadm	1.52	epollfd = epoll_create1(0);
292			if (epollfd < 0)
293	sysadm	1.13	{
294	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
295	sysadm	1.27	return -1;
296	sysadm	1.13	}
297	sysadm	1.10
298	sysadm	1.52	// Server socket
299			for (i = 0; i < 2; i++)
300	sysadm	1.23	{
301	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
302	sysadm	1.23
303	sysadm	1.52	if (socket_server[i] < 0)
304			{
305			log_error("Create socket_server error (%d)\n", errno);
306			return -1;
307			}
308	sysadm	1.10
309	sysadm	1.52	sin.sin_family = AF_INET;
310			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
311			sin.sin_port = htons(port[i]);
312
313			// Reuse address and port
314			flags[i] = 1;
315			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
316			{
317			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
318			}
319			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
320			{
321			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
322			}
323	sysadm	1.1
324	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
325			{
326			log_error("Bind address %s:%u error (%d)\n",
327			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
328			return -1;
329			}
330	sysadm	1.16
331	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
332			{
333			log_error("Telnet socket listen error (%d)\n", errno);
334			return -1;
335			}
336	sysadm	1.13
337	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
338	sysadm	1.25
339	sysadm	1.52	ev.events = EPOLLIN;
340			ev.data.fd = socket_server[i];
341			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
342	sysadm	1.30	{
343	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
344			if (close(epollfd) < 0)
345			{
346			log_error("close(epoll) error (%d)\n");
347			}
348			return -1;
349	sysadm	1.30	}
350	sysadm	1.52
351			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
352			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
353	sysadm	1.25	}
354
355	sysadm	1.31	// Startup complete
356			sd_notifyf(0, "READY=1\n"
357	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
358	sysadm	1.31	"MAINPID=%d",
359	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
360	sysadm	1.31
361	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
362	sysadm	1.13	{
363	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
364			{
365			sd_notify(0, "STOPPING=1");
366			sd_notify_stopping = 1;
367			}
368	sysadm	1.37
369	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
370	sysadm	1.19	{
371	sysadm	1.30	SYS_child_exit = 0;
372
373	sysadm	1.19	siginfo.si_pid = 0;
374			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
375			if (ret == 0 && siginfo.si_pid > 0)
376			{
377	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
378
379	sysadm	1.19	SYS_child_process_count--;
380	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
381	sysadm	1.44
382	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
383	sysadm	1.44	{
384	sysadm	1.45	i = 0;
385			for (; i < BBS_max_client; i++)
386	sysadm	1.44	{
387	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
388			{
389			process_sockaddr_pool[i].pid = 0;
390			break;
391			}
392			}
393			if (i >= BBS_max_client)
394			{
395			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
396	sysadm	1.44	}
397			}
398	sysadm	1.19	}
399			else if (ret == 0)
400			{
401			break;
402			}
403			else if (ret < 0)
404			{
405			log_error("Error in waitid: %d\n", errno);
406			break;
407			}
408			}
409
410	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
411	sysadm	1.21	{
412	sysadm	1.49	log_common("Notify %d child process to exit\n", SYS_child_process_count);
413	sysadm	1.21	if (kill(0, SIGTERM) < 0)
414			{
415			log_error("Send SIGTERM signal failed (%d)\n", errno);
416			}
417	sysadm	1.31
418			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
419	sysadm	1.21	}
420
421	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
422	sysadm	1.19	{
423	sysadm	1.44	SYS_conf_reload = 0;
424	sysadm	1.37	sd_notify(0, "RELOADING=1");
425	sysadm	1.30
426	sysadm	1.44	// Reload configuration
427			if (load_conf(CONF_BBSD) < 0)
428			{
429			log_error("Reload conf failed\n");
430			}
431
432	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
433			if (p_bbs_menu_new == NULL)
434			{
435			log_error("OOM: calloc(MENU_SET)\n");
436			}
437			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
438			{
439			unload_menu(p_bbs_menu_new);
440			free(p_bbs_menu_new);
441	sysadm	1.38	p_bbs_menu_new = NULL;
442	sysadm	1.33
443	sysadm	1.19	log_error("Reload menu failed\n");
444			}
445			else
446			{
447	sysadm	1.34	unload_menu(p_bbs_menu);
448			free(p_bbs_menu);
449
450			p_bbs_menu = p_bbs_menu_new;
451			p_bbs_menu_new = NULL;
452
453	sysadm	1.49	log_common("Reload menu successfully\n");
454	sysadm	1.19	}
455	sysadm	1.37
456			sd_notify(0, "READY=1");
457	sysadm	1.19	}
458
459	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
460			{
461			SYS_data_file_reload = 0;
462	sysadm	1.37	sd_notify(0, "RELOADING=1");
463	sysadm	1.35
464			for (int i = 0; i < data_files_load_startup_count; i++)
465			{
466	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
467	sysadm	1.35	{
468			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
469			}
470			}
471
472	sysadm	1.49	log_common("Reload data files successfully\n");
473	sysadm	1.37	sd_notify(0, "READY=1");
474	sysadm	1.35	}
475
476	sysadm	1.42	if (SYS_section_list_reload && !SYS_server_exit)
477			{
478			SYS_section_list_reload = 0;
479
480			if (section_list_loader_reload() < 0)
481			{
482			log_error("ksection_list_loader_reload() failed\n");
483			}
484			}
485
486	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
487	sysadm	1.22
488	sysadm	1.25	if (nfds < 0)
489	sysadm	1.19	{
490			if (errno != EINTR)
491			{
492	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
493			break;
494	sysadm	1.19	}
495			continue;
496			}
497	sysadm	1.13
498	sysadm	1.19	// Stop accept new connection on exit
499			if (SYS_server_exit)
500	sysadm	1.13	{
501			continue;
502			}
503
504	sysadm	1.25	for (int i = 0; i < nfds; i++)
505	sysadm	1.13	{
506	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
507	sysadm	1.13	{
508	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
509	sysadm	1.52
510	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
511	sysadm	1.13	{
512	sysadm	1.52	addrlen = sizeof(sin);
513	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
514	sysadm	1.25	if (socket_client < 0)
515			{
516	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
517			{
518			break;
519			}
520			else if (errno == EINTR)
521			{
522			continue;
523			}
524			else
525	sysadm	1.25	{
526			log_error("accept(socket_server) error (%d)\n", errno);
527	sysadm	1.28	break;
528	sysadm	1.25	}
529			}
530
531			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
532			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
533
534			port_client = ntohs(sin.sin_port);
535
536	sysadm	1.54	log_common("Accept %sconnection from %s:%d\n", (SSH_v2 ? "" : "SSH2 "), hostaddr_client, port_client);
537	sysadm	1.25
538	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
539	sysadm	1.25	{
540	sysadm	1.44	j = 0;
541			for (i = 0; i < BBS_max_client; i++)
542			{
543			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
544			{
545			j++;
546			if (j >= BBS_max_client_per_ip)
547			{
548	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
549	sysadm	1.44	break;
550			}
551			}
552			}
553
554			if (j < BBS_max_client_per_ip)
555	sysadm	1.43	{
556	sysadm	1.52	if ((pid = fork_server()) < 0)
557	sysadm	1.44	{
558			log_error("fork_server() error\n");
559			}
560			else if (pid > 0)
561			{
562			i = 0;
563			for (; i < BBS_max_client; i++)
564			{
565			if (process_sockaddr_pool[i].pid == 0)
566			{
567			break;
568			}
569			}
570
571			if (i >= BBS_max_client)
572			{
573			log_error("Process sockaddr pool depleted\n");
574			}
575			else
576			{
577			process_sockaddr_pool[i].pid = pid;
578			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
579			}
580			}
581	sysadm	1.43	}
582			}
583			else
584			{
585			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
586	sysadm	1.25	}
587
588			if (close(socket_client) == -1)
589			{
590			log_error("close(socket_lient) error (%d)\n", errno);
591			}
592	sysadm	1.13	}
593			}
594			}
595	sysadm	1.25	}
596	sysadm	1.13
597	sysadm	1.30	if (close(epollfd) < 0)
598			{
599			log_error("close(epoll) error (%d)\n");
600			}
601
602	sysadm	1.52	for (i = 0; i < 2; i++)
603			{
604			fcntl(socket_server[i], F_SETFL, flags[i]);
605	sysadm	1.13
606	sysadm	1.52	if (close(socket_server[i]) == -1)
607			{
608			log_error("Close server socket failed\n");
609			}
610	sysadm	1.13	}
611	sysadm	1.7
612	sysadm	1.51	ssh_bind_free(sshbind);
613			ssh_finalize();
614
615	sysadm	1.13	return 0;
616	sysadm	1.1	}
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