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 <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");
                        }
                }

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