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;
        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);

        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);

        while (!SYS_server_exit || SYS_child_process_count > 0)
        {
                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);
                        }
                }

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

                        if (reload_menu(&bbs_menu) < 0)
                        {
                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                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	1.3
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	siginfo_t siginfo;
48	sysadm	1.10
49	sysadm	1.13	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
50	sysadm	1.10
51	sysadm	1.13	if (socket_server < 0)
52			{
53			log_error("Create socket failed\n");
54	sysadm	1.27	return -1;
55	sysadm	1.13	}
56	sysadm	1.10
57	sysadm	1.13	sin.sin_family = AF_INET;
58	sysadm	1.23	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
59	sysadm	1.13	sin.sin_port = htons(port);
60
61	sysadm	1.23	// Reuse address and port
62			flags = 1;
63			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
64			{
65			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
66			}
67			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
68			{
69			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
70			}
71
72	sysadm	1.13	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
73	sysadm	1.10	{
74	sysadm	1.23	log_error("Bind address %s:%u failed (%d)\n",
75			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
76	sysadm	1.27	return -1;
77	sysadm	1.10	}
78
79	sysadm	1.13	if (listen(socket_server, 10) < 0)
80	sysadm	1.10	{
81	sysadm	1.23	log_error("Socket listen failed (%d)\n", errno);
82	sysadm	1.27	return -1;
83	sysadm	1.10	}
84	sysadm	1.1
85	sysadm	1.16	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
86			hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
87
88	sysadm	1.13	port_server = ntohs(sin.sin_port);
89	sysadm	1.19	namelen = sizeof(sin);
90	sysadm	1.13
91			log_std("Listening at %s:%d\n", hostaddr_server, port_server);
92
93	sysadm	1.25	epollfd = epoll_create1(0);
94			if (epollfd < 0)
95			{
96			log_error("epoll_create1() error (%d)\n", errno);
97			return -1;
98			}
99
100	sysadm	1.28	ev.events = EPOLLIN;
101	sysadm	1.25	ev.data.fd = socket_server;
102			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
103			{
104			log_error("epoll_ctl(socket_server) error (%d)\n", errno);
105	sysadm	1.30	if (close(epollfd) < 0)
106			{
107			log_error("close(epoll) error (%d)\n");
108			}
109	sysadm	1.25	return -1;
110			}
111
112			flags = fcntl(socket_server, F_GETFL, 0);
113			fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
114
115	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
116	sysadm	1.13	{
117	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
118	sysadm	1.19	{
119	sysadm	1.30	SYS_child_exit = 0;
120
121	sysadm	1.19	siginfo.si_pid = 0;
122			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
123			if (ret == 0 && siginfo.si_pid > 0)
124			{
125	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
126
127	sysadm	1.19	SYS_child_process_count--;
128			log_std("Child process (%d) exited\n", siginfo.si_pid);
129			}
130			else if (ret == 0)
131			{
132			break;
133			}
134			else if (ret < 0)
135			{
136			log_error("Error in waitid: %d\n", errno);
137			break;
138			}
139			}
140
141	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
142	sysadm	1.21	{
143	sysadm	1.22	log_std("Notify %d child process to exit\n", SYS_child_process_count);
144	sysadm	1.21	if (kill(0, SIGTERM) < 0)
145			{
146			log_error("Send SIGTERM signal failed (%d)\n", errno);
147			}
148			}
149
150	sysadm	1.20	if (SYS_menu_reload && !SYS_server_exit)
151	sysadm	1.19	{
152	sysadm	1.30	SYS_menu_reload = 0;
153
154	sysadm	1.19	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			}
163
164	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
165	sysadm	1.22
166	sysadm	1.25	if (nfds < 0)
167	sysadm	1.19	{
168			if (errno != EINTR)
169			{
170	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
171			break;
172	sysadm	1.19	}
173			continue;
174			}
175	sysadm	1.13
176	sysadm	1.19	// Stop accept new connection on exit
177			if (SYS_server_exit)
178	sysadm	1.13	{
179			continue;
180			}
181
182	sysadm	1.25	for (int i = 0; i < nfds; i++)
183	sysadm	1.13	{
184	sysadm	1.25	if (events[i].data.fd == socket_server)
185	sysadm	1.13	{
186	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
187	sysadm	1.13	{
188	sysadm	1.25	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
189			if (socket_client < 0)
190			{
191	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
192			{
193			break;
194			}
195			else if (errno == EINTR)
196			{
197			continue;
198			}
199			else
200	sysadm	1.25	{
201			log_error("accept(socket_server) error (%d)\n", errno);
202	sysadm	1.28	break;
203	sysadm	1.25	}
204			}
205
206			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
207			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
208
209			port_client = ntohs(sin.sin_port);
210
211			log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
212
213			if (fork_server() < 0)
214			{
215			log_error("fork_server() error\n");
216			}
217
218			if (close(socket_client) == -1)
219			{
220			log_error("close(socket_lient) error (%d)\n", errno);
221			}
222	sysadm	1.13	}
223			}
224			}
225	sysadm	1.25	}
226	sysadm	1.13
227	sysadm	1.30	if (close(epollfd) < 0)
228			{
229			log_error("close(epoll) error (%d)\n");
230			}
231
232	sysadm	1.25	fcntl(socket_server, F_SETFL, flags);
233	sysadm	1.13
234			if (close(socket_server) == -1)
235			{
236			log_error("Close server socket failed\n");
237			}
238	sysadm	1.7
239	sysadm	1.13	return 0;
240	sysadm	1.1	}
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