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 "log.h"
#include "io.h"
#include "fork.h"
#include "menu.h"
#include "file_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 <systemd/sd-daemon.h>

int net_server(const char *hostaddr, in_port_t port)
{
        unsigned int namelen;
        int ret;
        int flags;
        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;

        socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

        if (socket_server < 0)
        {
                log_error("Create socket failed\n");
                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);

        // Reuse address and port
        flags = 1;
        if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
        {
                log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
        }
        if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
        {
                log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
        }

        if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
        {
                log_error("Bind address %s:%u failed (%d)\n",
                                  inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
                return -1;
        }

        if (listen(socket_server, 10) < 0)
        {
                log_error("Socket listen failed (%d)\n", errno);
                return -1;
        }

        strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
        hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';

        port_server = ntohs(sin.sin_port);
        namelen = sizeof(sin);

        log_std("Listening at %s:%d\n", hostaddr_server, port_server);

        epollfd = epoll_create1(0);
        if (epollfd < 0)
        {
                log_error("epoll_create1() error (%d)\n", errno);
                return -1;
        }

        ev.events = EPOLLIN;
        ev.data.fd = socket_server;
        if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
        {
                log_error("epoll_ctl(socket_server) error (%d)\n", errno);
                if (close(epollfd) < 0)
                {
                        log_error("close(epoll) error (%d)\n");
                }
                return -1;
        }

        flags = fcntl(socket_server, F_GETFL, 0);
        fcntl(socket_server, F_SETFL, flags | O_NONBLOCK);

        // Startup complete
        sd_notifyf(0, "READY=1\n"
                                  "STATUS=Listening at %s:%d\n"
                                  "MAINPID=%d",
                           hostaddr_server, port_server, 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_std("Child process (%d) exited\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_std("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_menu_reload && !SYS_server_exit)
                {
                        SYS_menu_reload = 0;

                        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);

                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                unload_menu_shm(p_bbs_menu_new);

                                unload_menu(p_bbs_menu);
                                free(p_bbs_menu);

                                p_bbs_menu = p_bbs_menu_new;
                                p_bbs_menu_new = NULL;

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

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

                        for (int i = 0; i < data_files_load_startup_count; i++)
                        {
                                if (load_file_shm(data_files_load_startup[i]) < 0)
                                {
                                        log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
                                }
                        }

                        log_std("Reload data files successfully\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)
                        {
                                while (!SYS_server_exit) // Accept all incoming connections until error
                                {
                                        socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
                                        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_std("Accept connection from %s:%d\n", hostaddr_client, port_client);

                                        if (fork_server() < 0)
                                        {
                                                log_error("fork_server() error\n");
                                        }

                                        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");
        }

        fcntl(socket_server, F_SETFL, flags);

        if (close(socket_server) == -1)
        {
                log_error("Close server socket failed\n");
        }

        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	1.14	#include "log.h"
24	sysadm	1.7	#include "io.h"
25	sysadm	1.14	#include "fork.h"
26	sysadm	1.19	#include "menu.h"
27	sysadm	1.35	#include "file_loader.h"
28	sysadm	1.20	#include <errno.h>
29			#include <fcntl.h>
30			#include <string.h>
31	sysadm	1.19	#include <signal.h>
32	sysadm	1.20	#include <stdlib.h>
33	sysadm	1.19	#include <unistd.h>
34			#include <sys/syscall.h>
35	sysadm	1.7	#include <sys/socket.h>
36	sysadm	1.19	#include <sys/wait.h>
37	sysadm	1.25	#include <sys/epoll.h>
38	sysadm	1.9	#include <arpa/inet.h>
39	sysadm	1.31	#include <systemd/sd-daemon.h>
40	sysadm	1.3
41	sysadm	1.17	int net_server(const char *hostaddr, in_port_t port)
42	sysadm	1.1	{
43	sysadm	1.15	unsigned int namelen;
44	sysadm	1.19	int ret;
45	sysadm	1.15	int flags;
46	sysadm	1.13	struct sockaddr_in sin;
47	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
48			int nfds, epollfd;
49	sysadm	1.19	siginfo_t siginfo;
50	sysadm	1.31	int sd_notify_stopping = 0;
51	sysadm	1.34	MENU_SET *p_bbs_menu_new;
52	sysadm	1.10
53	sysadm	1.13	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
54	sysadm	1.10
55	sysadm	1.13	if (socket_server < 0)
56			{
57			log_error("Create socket failed\n");
58	sysadm	1.27	return -1;
59	sysadm	1.13	}
60	sysadm	1.10
61	sysadm	1.13	sin.sin_family = AF_INET;
62	sysadm	1.23	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
63	sysadm	1.13	sin.sin_port = htons(port);
64
65	sysadm	1.23	// Reuse address and port
66			flags = 1;
67			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
68			{
69			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
70			}
71			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
72			{
73			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
74			}
75
76	sysadm	1.13	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
77	sysadm	1.10	{
78	sysadm	1.23	log_error("Bind address %s:%u failed (%d)\n",
79			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
80	sysadm	1.27	return -1;
81	sysadm	1.10	}
82
83	sysadm	1.13	if (listen(socket_server, 10) < 0)
84	sysadm	1.10	{
85	sysadm	1.23	log_error("Socket listen failed (%d)\n", errno);
86	sysadm	1.27	return -1;
87	sysadm	1.10	}
88	sysadm	1.1
89	sysadm	1.16	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
90			hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
91
92	sysadm	1.13	port_server = ntohs(sin.sin_port);
93	sysadm	1.19	namelen = sizeof(sin);
94	sysadm	1.13
95			log_std("Listening at %s:%d\n", hostaddr_server, port_server);
96
97	sysadm	1.25	epollfd = epoll_create1(0);
98			if (epollfd < 0)
99			{
100			log_error("epoll_create1() error (%d)\n", errno);
101			return -1;
102			}
103
104	sysadm	1.28	ev.events = EPOLLIN;
105	sysadm	1.25	ev.data.fd = socket_server;
106			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
107			{
108			log_error("epoll_ctl(socket_server) error (%d)\n", errno);
109	sysadm	1.30	if (close(epollfd) < 0)
110			{
111			log_error("close(epoll) error (%d)\n");
112			}
113	sysadm	1.25	return -1;
114			}
115
116			flags = fcntl(socket_server, F_GETFL, 0);
117			fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
118
119	sysadm	1.31	// Startup complete
120			sd_notifyf(0, "READY=1\n"
121	sysadm	1.32	"STATUS=Listening at %s:%d\n"
122	sysadm	1.31	"MAINPID=%d",
123	sysadm	1.32	hostaddr_server, port_server, getpid());
124	sysadm	1.31
125	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
126	sysadm	1.13	{
127	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
128			{
129			sd_notify(0, "STOPPING=1");
130			sd_notify_stopping = 1;
131			}
132	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
133	sysadm	1.19	{
134	sysadm	1.30	SYS_child_exit = 0;
135
136	sysadm	1.19	siginfo.si_pid = 0;
137			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
138			if (ret == 0 && siginfo.si_pid > 0)
139			{
140	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
141
142	sysadm	1.19	SYS_child_process_count--;
143			log_std("Child process (%d) exited\n", siginfo.si_pid);
144			}
145			else if (ret == 0)
146			{
147			break;
148			}
149			else if (ret < 0)
150			{
151			log_error("Error in waitid: %d\n", errno);
152			break;
153			}
154			}
155
156	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
157	sysadm	1.21	{
158	sysadm	1.22	log_std("Notify %d child process to exit\n", SYS_child_process_count);
159	sysadm	1.21	if (kill(0, SIGTERM) < 0)
160			{
161			log_error("Send SIGTERM signal failed (%d)\n", errno);
162			}
163	sysadm	1.31
164			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
165	sysadm	1.21	}
166
167	sysadm	1.20	if (SYS_menu_reload && !SYS_server_exit)
168	sysadm	1.19	{
169	sysadm	1.30	SYS_menu_reload = 0;
170
171	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
172			if (p_bbs_menu_new == NULL)
173			{
174			log_error("OOM: calloc(MENU_SET)\n");
175			}
176			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
177			{
178			unload_menu(p_bbs_menu_new);
179			free(p_bbs_menu_new);
180	sysadm	1.33
181	sysadm	1.19	log_error("Reload menu failed\n");
182			}
183			else
184			{
185	sysadm	1.34	unload_menu_shm(p_bbs_menu_new);
186
187			unload_menu(p_bbs_menu);
188			free(p_bbs_menu);
189
190			p_bbs_menu = p_bbs_menu_new;
191			p_bbs_menu_new = NULL;
192
193	sysadm	1.19	log_std("Reload menu successfully\n");
194			}
195			}
196
197	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
198			{
199			SYS_data_file_reload = 0;
200
201			for (int i = 0; i < data_files_load_startup_count; i++)
202			{
203	sysadm	1.36	if (load_file_shm(data_files_load_startup[i]) < 0)
204	sysadm	1.35	{
205			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
206			}
207			}
208
209			log_std("Reload data files successfully\n");
210			}
211
212	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
213	sysadm	1.22
214	sysadm	1.25	if (nfds < 0)
215	sysadm	1.19	{
216			if (errno != EINTR)
217			{
218	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
219			break;
220	sysadm	1.19	}
221			continue;
222			}
223	sysadm	1.13
224	sysadm	1.19	// Stop accept new connection on exit
225			if (SYS_server_exit)
226	sysadm	1.13	{
227			continue;
228			}
229
230	sysadm	1.25	for (int i = 0; i < nfds; i++)
231	sysadm	1.13	{
232	sysadm	1.25	if (events[i].data.fd == socket_server)
233	sysadm	1.13	{
234	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
235	sysadm	1.13	{
236	sysadm	1.25	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
237			if (socket_client < 0)
238			{
239	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
240			{
241			break;
242			}
243			else if (errno == EINTR)
244			{
245			continue;
246			}
247			else
248	sysadm	1.25	{
249			log_error("accept(socket_server) error (%d)\n", errno);
250	sysadm	1.28	break;
251	sysadm	1.25	}
252			}
253
254			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
255			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
256
257			port_client = ntohs(sin.sin_port);
258
259			log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
260
261			if (fork_server() < 0)
262			{
263			log_error("fork_server() error\n");
264			}
265
266			if (close(socket_client) == -1)
267			{
268			log_error("close(socket_lient) error (%d)\n", errno);
269			}
270	sysadm	1.13	}
271			}
272			}
273	sysadm	1.25	}
274	sysadm	1.13
275	sysadm	1.30	if (close(epollfd) < 0)
276			{
277			log_error("close(epoll) error (%d)\n");
278			}
279
280	sysadm	1.25	fcntl(socket_server, F_SETFL, flags);
281	sysadm	1.13
282			if (close(socket_server) == -1)
283			{
284			log_error("Close server socket failed\n");
285			}
286	sysadm	1.7
287	sysadm	1.13	return 0;
288	sysadm	1.1	}
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