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 "section_list_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);
                                p_bbs_menu_new = NULL;

                                log_error("Reload menu failed\n");
                        }
                        else
                        {
                                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(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");
                }

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

                        if (section_list_loader_reload() < 0)
                        {
                                log_error("ksection_list_loader_reload() failed\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	/***************************************************************************
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 "section_list_loader.h"
29	#include <errno.h>
30	#include <fcntl.h>
31	#include <string.h>
32	#include <signal.h>
33	#include <stdlib.h>
34	#include <unistd.h>
35	#include <sys/syscall.h>
36	#include <sys/socket.h>
37	#include <sys/wait.h>
38	#include <sys/epoll.h>
39	#include <arpa/inet.h>
40	#include <systemd/sd-daemon.h>
41
42	int net_server(const char *hostaddr, in_port_t port)
43	{
44	unsigned int namelen;
45	int ret;
46	int flags;
47	struct sockaddr_in sin;
48	struct epoll_event ev, events[MAX_EVENTS];
49	int nfds, epollfd;
50	siginfo_t siginfo;
51	int sd_notify_stopping = 0;
52	MENU_SET *p_bbs_menu_new;
53
54	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
55
56	if (socket_server < 0)
57	{
58	log_error("Create socket failed\n");
59	return -1;
60	}
61
62	sin.sin_family = AF_INET;
63	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
64	sin.sin_port = htons(port);
65
66	// Reuse address and port
67	flags = 1;
68	if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
69	{
70	log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
71	}
72	if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
73	{
74	log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
75	}
76
77	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
78	{
79	log_error("Bind address %s:%u failed (%d)\n",
80	inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
81	return -1;
82	}
83
84	if (listen(socket_server, 10) < 0)
85	{
86	log_error("Socket listen failed (%d)\n", errno);
87	return -1;
88	}
89
90	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
91	hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
92
93	port_server = ntohs(sin.sin_port);
94	namelen = sizeof(sin);
95
96	log_std("Listening at %s:%d\n", hostaddr_server, port_server);
97
98	epollfd = epoll_create1(0);
99	if (epollfd < 0)
100	{
101	log_error("epoll_create1() error (%d)\n", errno);
102	return -1;
103	}
104
105	ev.events = EPOLLIN;
106	ev.data.fd = socket_server;
107	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
108	{
109	log_error("epoll_ctl(socket_server) error (%d)\n", errno);
110	if (close(epollfd) < 0)
111	{
112	log_error("close(epoll) error (%d)\n");
113	}
114	return -1;
115	}
116
117	flags = fcntl(socket_server, F_GETFL, 0);
118	fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
119
120	// Startup complete
121	sd_notifyf(0, "READY=1\n"
122	"STATUS=Listening at %s:%d\n"
123	"MAINPID=%d",
124	hostaddr_server, port_server, getpid());
125
126	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
127	{
128	if (SYS_server_exit && !sd_notify_stopping)
129	{
130	sd_notify(0, "STOPPING=1");
131	sd_notify_stopping = 1;
132	}
133
134	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
135	{
136	SYS_child_exit = 0;
137
138	siginfo.si_pid = 0;
139	ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
140	if (ret == 0 && siginfo.si_pid > 0)
141	{
142	SYS_child_exit = 1; // Retry waitid
143
144	SYS_child_process_count--;
145	log_std("Child process (%d) exited\n", siginfo.si_pid);
146	}
147	else if (ret == 0)
148	{
149	break;
150	}
151	else if (ret < 0)
152	{
153	log_error("Error in waitid: %d\n", errno);
154	break;
155	}
156	}
157
158	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
159	{
160	log_std("Notify %d child process to exit\n", SYS_child_process_count);
161	if (kill(0, SIGTERM) < 0)
162	{
163	log_error("Send SIGTERM signal failed (%d)\n", errno);
164	}
165
166	sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
167	}
168
169	if (SYS_menu_reload && !SYS_server_exit)
170	{
171	SYS_menu_reload = 0;
172	sd_notify(0, "RELOADING=1");
173
174	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
175	if (p_bbs_menu_new == NULL)
176	{
177	log_error("OOM: calloc(MENU_SET)\n");
178	}
179	else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
180	{
181	unload_menu(p_bbs_menu_new);
182	free(p_bbs_menu_new);
183	p_bbs_menu_new = NULL;
184
185	log_error("Reload menu failed\n");
186	}
187	else
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(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	if (SYS_section_list_reload && !SYS_server_exit)
219	{
220	SYS_section_list_reload = 0;
221
222	if (section_list_loader_reload() < 0)
223	{
224	log_error("ksection_list_loader_reload() failed\n");
225	}
226	}
227
228	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
229
230	if (nfds < 0)
231	{
232	if (errno != EINTR)
233	{
234	log_error("epoll_wait() error (%d)\n", errno);
235	break;
236	}
237	continue;
238	}
239
240	// Stop accept new connection on exit
241	if (SYS_server_exit)
242	{
243	continue;
244	}
245
246	for (int i = 0; i < nfds; i++)
247	{
248	if (events[i].data.fd == socket_server)
249	{
250	while (!SYS_server_exit) // Accept all incoming connections until error
251	{
252	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
253	if (socket_client < 0)
254	{
255	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
256	{
257	break;
258	}
259	else if (errno == EINTR)
260	{
261	continue;
262	}
263	else
264	{
265	log_error("accept(socket_server) error (%d)\n", errno);
266	break;
267	}
268	}
269
270	strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
271	hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
272
273	port_client = ntohs(sin.sin_port);
274
275	log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
276
277	if (fork_server() < 0)
278	{
279	log_error("fork_server() error\n");
280	}
281
282	if (close(socket_client) == -1)
283	{
284	log_error("close(socket_lient) error (%d)\n", errno);
285	}
286	}
287	}
288	}
289	}
290
291	if (close(epollfd) < 0)
292	{
293	log_error("close(epoll) error (%d)\n");
294	}
295
296	fcntl(socket_server, F_SETFL, flags);
297
298	if (close(socket_server) == -1)
299	{
300	log_error("Close server socket failed\n");
301	}
302
303	return 0;
304	}
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