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>

#define MAX_EVENTS 10

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");
                exit(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);
                exit(2);
        }

        if (listen(socket_server, 10) < 0)
        {
                log_error("Socket listen failed (%d)\n", errno);
                exit(3);
        }

        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 && errno != ECONNABORTED && errno != EINTR)
                                                {
                                                        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	/***************************************************************************
2	net_server.c - description
3	-------------------
4	Copyright : (C) 2004-2025 by Leaflet
5	Email : leaflet@leafok.com
6	***************************************************************************/
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	* the Free Software Foundation; either version 3 of the License, or *
13	* (at your option) any later version. *
14	* *
15	***************************************************************************/
16
17	#define _XOPEN_SOURCE 500
18	#define _POSIX_C_SOURCE 200809L
19	#define _GNU_SOURCE
20
21	#include "net_server.h"
22	#include "common.h"
23	#include "log.h"
24	#include "io.h"
25	#include "fork.h"
26	#include "menu.h"
27	#include <errno.h>
28	#include <fcntl.h>
29	#include <string.h>
30	#include <signal.h>
31	#include <stdlib.h>
32	#include <unistd.h>
33	#include <sys/syscall.h>
34	#include <sys/socket.h>
35	#include <sys/wait.h>
36	#include <sys/epoll.h>
37	#include <arpa/inet.h>
38
39	#define MAX_EVENTS 10
40
41	int net_server(const char *hostaddr, in_port_t port)
42	{
43	unsigned int namelen;
44	int ret;
45	int flags;
46	struct sockaddr_in sin;
47	struct epoll_event ev, events[MAX_EVENTS];
48	int nfds, epollfd;
49	sigset_t nsigset;
50	sigset_t osigset;
51	siginfo_t siginfo;
52
53	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
54
55	if (socket_server < 0)
56	{
57	log_error("Create socket failed\n");
58	exit(1);
59	}
60
61	sin.sin_family = AF_INET;
62	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
63	sin.sin_port = htons(port);
64
65	// 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	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
77	{
78	log_error("Bind address %s:%u failed (%d)\n",
79	inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
80	exit(2);
81	}
82
83	if (listen(socket_server, 10) < 0)
84	{
85	log_error("Socket listen failed (%d)\n", errno);
86	exit(3);
87	}
88
89	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
90	hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
91
92	port_server = ntohs(sin.sin_port);
93	namelen = sizeof(sin);
94
95	log_std("Listening at %s:%d\n", hostaddr_server, port_server);
96
97	sigemptyset(&nsigset);
98	sigaddset(&nsigset, SIGHUP);
99	sigaddset(&nsigset, SIGCHLD);
100	sigaddset(&nsigset, SIGTERM);
101
102	epollfd = epoll_create1(0);
103	if (epollfd < 0)
104	{
105	log_error("epoll_create1() error (%d)\n", errno);
106	return -1;
107	}
108
109	ev.events = EPOLLIN;
110	ev.data.fd = socket_server;
111	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
112	{
113	log_error("epoll_ctl(socket_server) error (%d)\n", errno);
114	return -1;
115	}
116
117	flags = fcntl(socket_server, F_GETFL, 0);
118	fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
119
120	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
121	{
122	sigprocmask(SIG_BLOCK, &nsigset, &osigset);
123
124	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
125	{
126	siginfo.si_pid = 0;
127	ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
128	if (ret == 0 && siginfo.si_pid > 0)
129	{
130	SYS_child_process_count--;
131	log_std("Child process (%d) exited\n", siginfo.si_pid);
132	}
133	else if (ret == 0)
134	{
135	SYS_child_exit = 0;
136	break;
137	}
138	else if (ret < 0)
139	{
140	log_error("Error in waitid: %d\n", errno);
141	break;
142	}
143	}
144
145	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
146	{
147	log_std("Notify %d child process to exit\n", SYS_child_process_count);
148	if (kill(0, SIGTERM) < 0)
149	{
150	log_error("Send SIGTERM signal failed (%d)\n", errno);
151	}
152	}
153
154	if (SYS_menu_reload && !SYS_server_exit)
155	{
156	if (reload_menu(&bbs_menu) < 0)
157	{
158	log_error("Reload menu failed\n");
159	}
160	else
161	{
162	log_std("Reload menu successfully\n");
163	}
164	SYS_menu_reload = 0;
165	}
166
167	sigprocmask(SIG_SETMASK, &osigset, NULL);
168
169	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
170
171	if (nfds < 0)
172	{
173	if (errno != EINTR)
174	{
175	log_error("epoll_wait() error (%d)\n", errno);
176	break;
177	}
178	continue;
179	}
180
181	// Stop accept new connection on exit
182	if (SYS_server_exit)
183	{
184	continue;
185	}
186
187	for (int i = 0; i < nfds; i++)
188	{
189	if (events[i].data.fd == socket_server)
190	{
191	while (1) // Accept all incoming connections until error
192	{
193	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
194	if (socket_client < 0)
195	{
196	if (errno != EAGAIN && errno != EWOULDBLOCK && errno != ECONNABORTED && errno != EINTR)
197	{
198	log_error("accept(socket_server) error (%d)\n", errno);
199	}
200	break;
201	}
202
203	strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
204	hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
205
206	port_client = ntohs(sin.sin_port);
207
208	log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
209
210	if (fork_server() < 0)
211	{
212	log_error("fork_server() error\n");
213	}
214
215	if (close(socket_client) == -1)
216	{
217	log_error("close(socket_lient) error (%d)\n", errno);
218	}
219	}
220	}
221	}
222	}
223
224	fcntl(socket_server, F_SETFL, flags);
225
226	if (close(socket_server) == -1)
227	{
228	log_error("Close server socket failed\n");
229	}
230
231	return 0;
232	}
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