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>

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;
        sigset_t nsigset;
        sigset_t osigset;
        siginfo_t siginfo;

        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);

        sigemptyset(&nsigset);
        sigaddset(&nsigset, SIGHUP);
        sigaddset(&nsigset, SIGCHLD);
        sigaddset(&nsigset, SIGTERM);

        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);
                return -1;
        }

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

        while (!SYS_server_exit || SYS_child_process_count > 0)
        {
                sigprocmask(SIG_BLOCK, &nsigset, &osigset);

                while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
                {
                        siginfo.si_pid = 0;
                        ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
                        if (ret == 0 && siginfo.si_pid > 0)
                        {
                                SYS_child_process_count--;
                                log_std("Child process (%d) exited\n", siginfo.si_pid);
                        }
                        else if (ret == 0)
                        {
                                SYS_child_exit = 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);
                        }
                }

                if (SYS_menu_reload && !SYS_server_exit)
                {
                        if (reload_menu(&bbs_menu) < 0)
                        {
                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                log_std("Reload menu successfully\n");
                        }
                        SYS_menu_reload = 0;
                }

                sigprocmask(SIG_SETMASK, &osigset, NULL);

                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 (1) // 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);
                                        }
                                }
                        }
                }
        }

        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	1.3
39	sysadm	1.17	int net_server(const char *hostaddr, in_port_t port)
40	sysadm	1.1	{
41	sysadm	1.15	unsigned int namelen;
42	sysadm	1.19	int ret;
43	sysadm	1.15	int flags;
44	sysadm	1.13	struct sockaddr_in sin;
45	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
46			int nfds, epollfd;
47	sysadm	1.19	sigset_t nsigset;
48			sigset_t osigset;
49			siginfo_t siginfo;
50	sysadm	1.10
51	sysadm	1.13	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
52	sysadm	1.10
53	sysadm	1.13	if (socket_server < 0)
54			{
55			log_error("Create socket failed\n");
56	sysadm	1.27	return -1;
57	sysadm	1.13	}
58	sysadm	1.10
59	sysadm	1.13	sin.sin_family = AF_INET;
60	sysadm	1.23	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
61	sysadm	1.13	sin.sin_port = htons(port);
62
63	sysadm	1.23	// Reuse address and port
64			flags = 1;
65			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
66			{
67			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
68			}
69			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
70			{
71			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
72			}
73
74	sysadm	1.13	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
75	sysadm	1.10	{
76	sysadm	1.23	log_error("Bind address %s:%u failed (%d)\n",
77			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
78	sysadm	1.27	return -1;
79	sysadm	1.10	}
80
81	sysadm	1.13	if (listen(socket_server, 10) < 0)
82	sysadm	1.10	{
83	sysadm	1.23	log_error("Socket listen failed (%d)\n", errno);
84	sysadm	1.27	return -1;
85	sysadm	1.10	}
86	sysadm	1.1
87	sysadm	1.16	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
88			hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
89
90	sysadm	1.13	port_server = ntohs(sin.sin_port);
91	sysadm	1.19	namelen = sizeof(sin);
92	sysadm	1.13
93			log_std("Listening at %s:%d\n", hostaddr_server, port_server);
94
95	sysadm	1.19	sigemptyset(&nsigset);
96			sigaddset(&nsigset, SIGHUP);
97			sigaddset(&nsigset, SIGCHLD);
98			sigaddset(&nsigset, SIGTERM);
99
100	sysadm	1.25	epollfd = epoll_create1(0);
101			if (epollfd < 0)
102			{
103			log_error("epoll_create1() error (%d)\n", errno);
104			return -1;
105			}
106
107	sysadm	1.28	ev.events = EPOLLIN;
108	sysadm	1.25	ev.data.fd = socket_server;
109			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
110			{
111			log_error("epoll_ctl(socket_server) error (%d)\n", errno);
112			return -1;
113			}
114
115			flags = fcntl(socket_server, F_GETFL, 0);
116			fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
117
118	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
119	sysadm	1.13	{
120	sysadm	1.19	sigprocmask(SIG_BLOCK, &nsigset, &osigset);
121
122	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
123	sysadm	1.19	{
124			siginfo.si_pid = 0;
125			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
126			if (ret == 0 && siginfo.si_pid > 0)
127			{
128			SYS_child_process_count--;
129			log_std("Child process (%d) exited\n", siginfo.si_pid);
130			}
131			else if (ret == 0)
132			{
133	sysadm	1.22	SYS_child_exit = 0;
134	sysadm	1.19	break;
135			}
136			else if (ret < 0)
137			{
138			log_error("Error in waitid: %d\n", errno);
139			break;
140			}
141			}
142
143	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
144	sysadm	1.21	{
145	sysadm	1.22	log_std("Notify %d child process to exit\n", SYS_child_process_count);
146	sysadm	1.21	if (kill(0, SIGTERM) < 0)
147			{
148			log_error("Send SIGTERM signal failed (%d)\n", errno);
149			}
150			}
151
152	sysadm	1.20	if (SYS_menu_reload && !SYS_server_exit)
153	sysadm	1.19	{
154			if (reload_menu(&bbs_menu) < 0)
155			{
156			log_error("Reload menu failed\n");
157			}
158			else
159			{
160			log_std("Reload menu successfully\n");
161			}
162			SYS_menu_reload = 0;
163			}
164
165			sigprocmask(SIG_SETMASK, &osigset, NULL);
166
167	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
168	sysadm	1.22
169	sysadm	1.25	if (nfds < 0)
170	sysadm	1.19	{
171			if (errno != EINTR)
172			{
173	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
174			break;
175	sysadm	1.19	}
176			continue;
177			}
178	sysadm	1.13
179	sysadm	1.19	// Stop accept new connection on exit
180			if (SYS_server_exit)
181	sysadm	1.13	{
182			continue;
183			}
184
185	sysadm	1.25	for (int i = 0; i < nfds; i++)
186	sysadm	1.13	{
187	sysadm	1.25	if (events[i].data.fd == socket_server)
188	sysadm	1.13	{
189	sysadm	1.25	while (1) // Accept all incoming connections until error
190	sysadm	1.13	{
191	sysadm	1.25	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
192			if (socket_client < 0)
193			{
194	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
195			{
196			break;
197			}
198			else if (errno == EINTR)
199			{
200			continue;
201			}
202			else
203	sysadm	1.25	{
204			log_error("accept(socket_server) error (%d)\n", errno);
205	sysadm	1.28	break;
206	sysadm	1.25	}
207			}
208
209			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
210			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
211
212			port_client = ntohs(sin.sin_port);
213
214			log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
215
216			if (fork_server() < 0)
217			{
218			log_error("fork_server() error\n");
219			}
220
221			if (close(socket_client) == -1)
222			{
223			log_error("close(socket_lient) error (%d)\n", errno);
224			}
225	sysadm	1.13	}
226			}
227			}
228	sysadm	1.25	}
229	sysadm	1.13
230	sysadm	1.25	fcntl(socket_server, F_SETFL, flags);
231	sysadm	1.13
232			if (close(socket_server) == -1)
233			{
234			log_error("Close server socket failed\n");
235			}
236	sysadm	1.7
237	sysadm	1.13	return 0;
238	sysadm	1.1	}
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