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;
                        sd_notify(0, "RELOADING=1");

                        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");
                        }

                        sd_notify(0, "READY=1");
                }

                if (SYS_data_file_reload && !SYS_server_exit)
                {
                        SYS_data_file_reload = 0;
                        sd_notify(0, "RELOADING=1");

                        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");
                        sd_notify(0, "READY=1");
                }

                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	/***************************************************************************
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 "file_loader.h"
28	#include <errno.h>
29	#include <fcntl.h>
30	#include <string.h>
31	#include <signal.h>
32	#include <stdlib.h>
33	#include <unistd.h>
34	#include <sys/syscall.h>
35	#include <sys/socket.h>
36	#include <sys/wait.h>
37	#include <sys/epoll.h>
38	#include <arpa/inet.h>
39	#include <systemd/sd-daemon.h>
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	siginfo_t siginfo;
50	int sd_notify_stopping = 0;
51	MENU_SET *p_bbs_menu_new;
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	return -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	return -1;
81	}
82
83	if (listen(socket_server, 10) < 0)
84	{
85	log_error("Socket listen failed (%d)\n", errno);
86	return -1;
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	epollfd = epoll_create1(0);
98	if (epollfd < 0)
99	{
100	log_error("epoll_create1() error (%d)\n", errno);
101	return -1;
102	}
103
104	ev.events = EPOLLIN;
105	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	if (close(epollfd) < 0)
110	{
111	log_error("close(epoll) error (%d)\n");
112	}
113	return -1;
114	}
115
116	flags = fcntl(socket_server, F_GETFL, 0);
117	fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
118
119	// Startup complete
120	sd_notifyf(0, "READY=1\n"
121	"STATUS=Listening at %s:%d\n"
122	"MAINPID=%d",
123	hostaddr_server, port_server, getpid());
124
125	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
126	{
127	if (SYS_server_exit && !sd_notify_stopping)
128	{
129	sd_notify(0, "STOPPING=1");
130	sd_notify_stopping = 1;
131	}
132
133	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
134	{
135	SYS_child_exit = 0;
136
137	siginfo.si_pid = 0;
138	ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
139	if (ret == 0 && siginfo.si_pid > 0)
140	{
141	SYS_child_exit = 1; // Retry waitid
142
143	SYS_child_process_count--;
144	log_std("Child process (%d) exited\n", siginfo.si_pid);
145	}
146	else if (ret == 0)
147	{
148	break;
149	}
150	else if (ret < 0)
151	{
152	log_error("Error in waitid: %d\n", errno);
153	break;
154	}
155	}
156
157	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
158	{
159	log_std("Notify %d child process to exit\n", SYS_child_process_count);
160	if (kill(0, SIGTERM) < 0)
161	{
162	log_error("Send SIGTERM signal failed (%d)\n", errno);
163	}
164
165	sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
166	}
167
168	if (SYS_menu_reload && !SYS_server_exit)
169	{
170	SYS_menu_reload = 0;
171	sd_notify(0, "RELOADING=1");
172
173	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
174	if (p_bbs_menu_new == NULL)
175	{
176	log_error("OOM: calloc(MENU_SET)\n");
177	}
178	else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
179	{
180	unload_menu(p_bbs_menu_new);
181	free(p_bbs_menu_new);
182
183	log_error("Reload menu failed\n");
184	}
185	else
186	{
187	unload_menu_shm(p_bbs_menu_new);
188
189	unload_menu(p_bbs_menu);
190	free(p_bbs_menu);
191
192	p_bbs_menu = p_bbs_menu_new;
193	p_bbs_menu_new = NULL;
194
195	log_std("Reload menu successfully\n");
196	}
197
198	sd_notify(0, "READY=1");
199	}
200
201	if (SYS_data_file_reload && !SYS_server_exit)
202	{
203	SYS_data_file_reload = 0;
204	sd_notify(0, "RELOADING=1");
205
206	for (int i = 0; i < data_files_load_startup_count; i++)
207	{
208	if (load_file_shm(data_files_load_startup[i]) < 0)
209	{
210	log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
211	}
212	}
213
214	log_std("Reload data files successfully\n");
215	sd_notify(0, "READY=1");
216	}
217
218	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
219
220	if (nfds < 0)
221	{
222	if (errno != EINTR)
223	{
224	log_error("epoll_wait() error (%d)\n", errno);
225	break;
226	}
227	continue;
228	}
229
230	// Stop accept new connection on exit
231	if (SYS_server_exit)
232	{
233	continue;
234	}
235
236	for (int i = 0; i < nfds; i++)
237	{
238	if (events[i].data.fd == socket_server)
239	{
240	while (!SYS_server_exit) // Accept all incoming connections until error
241	{
242	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
243	if (socket_client < 0)
244	{
245	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
246	{
247	break;
248	}
249	else if (errno == EINTR)
250	{
251	continue;
252	}
253	else
254	{
255	log_error("accept(socket_server) error (%d)\n", errno);
256	break;
257	}
258	}
259
260	strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
261	hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
262
263	port_client = ntohs(sin.sin_port);
264
265	log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
266
267	if (fork_server() < 0)
268	{
269	log_error("fork_server() error\n");
270	}
271
272	if (close(socket_client) == -1)
273	{
274	log_error("close(socket_lient) error (%d)\n", errno);
275	}
276	}
277	}
278	}
279	}
280
281	if (close(epollfd) < 0)
282	{
283	log_error("close(epoll) error (%d)\n");
284	}
285
286	fcntl(socket_server, F_SETFL, flags);
287
288	if (close(socket_server) == -1)
289	{
290	log_error("Close server socket failed\n");
291	}
292
293	return 0;
294	}
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