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 "init.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 <netinet/in.h>
#include <systemd/sd-daemon.h>
#include <libssh/server.h>

struct process_sockaddr_t
{
        pid_t pid;
        in_addr_t s_addr;
};
typedef struct process_sockaddr_t PROCESS_SOCKADDR;

static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];

int net_server(const char *hostaddr, in_port_t port)
{
        ssh_bind sshbind;
        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;
        int i, j;
        pid_t pid;
        int ssh_log_level = SSH_LOG_NOLOG;

        ssh_init();

        sshbind = ssh_bind_new();

        if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
        {
                log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
                ssh_bind_free(sshbind);
                return -1;
        }
        
        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_common("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_common("Child process (%d) exited\n", siginfo.si_pid);

                                if (siginfo.si_pid != section_list_loader_pid)
                                {
                                        i = 0;
                                        for (; i < BBS_max_client; i++)
                                        {
                                                if (process_sockaddr_pool[i].pid == siginfo.si_pid)
                                                {
                                                        process_sockaddr_pool[i].pid = 0;
                                                        break;
                                                }
                                        }
                                        if (i >= BBS_max_client)
                                        {
                                                log_error("Child process (%d) not found in process sockaddr pool\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_common("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_conf_reload && !SYS_server_exit)
                {
                        SYS_conf_reload = 0;
                        sd_notify(0, "RELOADING=1");

                        // Reload configuration
                        if (load_conf(CONF_BBSD) < 0)
                        {
                                log_error("Reload conf failed\n");
                        }

                        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_common("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_common("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_common("Accept connection from %s:%d\n", hostaddr_client, port_client);

                                        if (SYS_child_process_count - 1 < BBS_max_client)
                                        {
                                                j = 0;
                                                for (i = 0; i < BBS_max_client; i++)
                                                {
                                                        if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
                                                        {
                                                                j++;
                                                                if (j >= BBS_max_client_per_ip)
                                                                {
                                                                        log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
                                                                        break;
                                                                }
                                                        }
                                                }

                                                if (j < BBS_max_client_per_ip)
                                                {
                                                        if ((pid = fork_server(sshbind)) < 0)
                                                        {
                                                                log_error("fork_server() error\n");
                                                        }
                                                        else if (pid > 0)
                                                        {
                                                                i = 0;
                                                                for (; i < BBS_max_client; i++)
                                                                {
                                                                        if (process_sockaddr_pool[i].pid == 0)
                                                                        {
                                                                                break;
                                                                        }
                                                                }

                                                                if (i >= BBS_max_client)
                                                                {
                                                                        log_error("Process sockaddr pool depleted\n");
                                                                }
                                                                else
                                                                {
                                                                        process_sockaddr_pool[i].pid = pid;
                                                                        process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
                                                                }
                                                        }
                                                }
                                        }
                                        else
                                        {
                                                log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
                                        }

                                        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");
        }

        ssh_bind_free(sshbind);
        ssh_finalize();

        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	1.44	#include "init.h"
26	sysadm	1.14	#include "fork.h"
27	sysadm	1.19	#include "menu.h"
28	sysadm	1.35	#include "file_loader.h"
29	sysadm	1.42	#include "section_list_loader.h"
30	sysadm	1.20	#include <errno.h>
31			#include <fcntl.h>
32			#include <string.h>
33	sysadm	1.19	#include <signal.h>
34	sysadm	1.20	#include <stdlib.h>
35	sysadm	1.19	#include <unistd.h>
36			#include <sys/syscall.h>
37	sysadm	1.7	#include <sys/socket.h>
38	sysadm	1.19	#include <sys/wait.h>
39	sysadm	1.25	#include <sys/epoll.h>
40	sysadm	1.9	#include <arpa/inet.h>
41	sysadm	1.47	#include <netinet/in.h>
42	sysadm	1.31	#include <systemd/sd-daemon.h>
43	sysadm	1.51	#include <libssh/server.h>
44	sysadm	1.3
45	sysadm	1.44	struct process_sockaddr_t
46			{
47			pid_t pid;
48			in_addr_t s_addr;
49			};
50			typedef struct process_sockaddr_t PROCESS_SOCKADDR;
51
52	sysadm	1.48	static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
53	sysadm	1.44
54	sysadm	1.17	int net_server(const char *hostaddr, in_port_t port)
55	sysadm	1.1	{
56	sysadm	1.51	ssh_bind sshbind;
57	sysadm	1.15	unsigned int namelen;
58	sysadm	1.19	int ret;
59	sysadm	1.15	int flags;
60	sysadm	1.13	struct sockaddr_in sin;
61	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
62			int nfds, epollfd;
63	sysadm	1.19	siginfo_t siginfo;
64	sysadm	1.31	int sd_notify_stopping = 0;
65	sysadm	1.34	MENU_SET *p_bbs_menu_new;
66	sysadm	1.44	int i, j;
67			pid_t pid;
68	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
69	sysadm	1.10
70	sysadm	1.51	ssh_init();
71
72			sshbind = ssh_bind_new();
73
74			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
75			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
76			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
77			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
78			{
79			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
80			ssh_bind_free(sshbind);
81			return -1;
82			}
83
84	sysadm	1.13	socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
85	sysadm	1.10
86	sysadm	1.13	if (socket_server < 0)
87			{
88			log_error("Create socket failed\n");
89	sysadm	1.27	return -1;
90	sysadm	1.13	}
91	sysadm	1.10
92	sysadm	1.13	sin.sin_family = AF_INET;
93	sysadm	1.23	sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
94	sysadm	1.13	sin.sin_port = htons(port);
95
96	sysadm	1.23	// Reuse address and port
97			flags = 1;
98			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
99			{
100			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
101			}
102			if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
103			{
104			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
105			}
106
107	sysadm	1.13	if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
108	sysadm	1.10	{
109	sysadm	1.23	log_error("Bind address %s:%u failed (%d)\n",
110			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
111	sysadm	1.27	return -1;
112	sysadm	1.10	}
113
114	sysadm	1.13	if (listen(socket_server, 10) < 0)
115	sysadm	1.10	{
116	sysadm	1.23	log_error("Socket listen failed (%d)\n", errno);
117	sysadm	1.27	return -1;
118	sysadm	1.10	}
119	sysadm	1.1
120	sysadm	1.16	strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
121			hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
122
123	sysadm	1.13	port_server = ntohs(sin.sin_port);
124	sysadm	1.19	namelen = sizeof(sin);
125	sysadm	1.13
126	sysadm	1.49	log_common("Listening at %s:%d\n", hostaddr_server, port_server);
127	sysadm	1.13
128	sysadm	1.25	epollfd = epoll_create1(0);
129			if (epollfd < 0)
130			{
131			log_error("epoll_create1() error (%d)\n", errno);
132			return -1;
133			}
134
135	sysadm	1.28	ev.events = EPOLLIN;
136	sysadm	1.25	ev.data.fd = socket_server;
137			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
138			{
139			log_error("epoll_ctl(socket_server) error (%d)\n", errno);
140	sysadm	1.30	if (close(epollfd) < 0)
141			{
142			log_error("close(epoll) error (%d)\n");
143			}
144	sysadm	1.25	return -1;
145			}
146
147			flags = fcntl(socket_server, F_GETFL, 0);
148			fcntl(socket_server, F_SETFL, flags \| O_NONBLOCK);
149
150	sysadm	1.31	// Startup complete
151			sd_notifyf(0, "READY=1\n"
152	sysadm	1.32	"STATUS=Listening at %s:%d\n"
153	sysadm	1.31	"MAINPID=%d",
154	sysadm	1.32	hostaddr_server, port_server, getpid());
155	sysadm	1.31
156	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
157	sysadm	1.13	{
158	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
159			{
160			sd_notify(0, "STOPPING=1");
161			sd_notify_stopping = 1;
162			}
163	sysadm	1.37
164	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
165	sysadm	1.19	{
166	sysadm	1.30	SYS_child_exit = 0;
167
168	sysadm	1.19	siginfo.si_pid = 0;
169			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
170			if (ret == 0 && siginfo.si_pid > 0)
171			{
172	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
173
174	sysadm	1.19	SYS_child_process_count--;
175	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
176	sysadm	1.44
177	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
178	sysadm	1.44	{
179	sysadm	1.45	i = 0;
180			for (; i < BBS_max_client; i++)
181	sysadm	1.44	{
182	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
183			{
184			process_sockaddr_pool[i].pid = 0;
185			break;
186			}
187			}
188			if (i >= BBS_max_client)
189			{
190			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
191	sysadm	1.44	}
192			}
193	sysadm	1.19	}
194			else if (ret == 0)
195			{
196			break;
197			}
198			else if (ret < 0)
199			{
200			log_error("Error in waitid: %d\n", errno);
201			break;
202			}
203			}
204
205	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
206	sysadm	1.21	{
207	sysadm	1.49	log_common("Notify %d child process to exit\n", SYS_child_process_count);
208	sysadm	1.21	if (kill(0, SIGTERM) < 0)
209			{
210			log_error("Send SIGTERM signal failed (%d)\n", errno);
211			}
212	sysadm	1.31
213			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
214	sysadm	1.21	}
215
216	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
217	sysadm	1.19	{
218	sysadm	1.44	SYS_conf_reload = 0;
219	sysadm	1.37	sd_notify(0, "RELOADING=1");
220	sysadm	1.30
221	sysadm	1.44	// Reload configuration
222			if (load_conf(CONF_BBSD) < 0)
223			{
224			log_error("Reload conf failed\n");
225			}
226
227	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
228			if (p_bbs_menu_new == NULL)
229			{
230			log_error("OOM: calloc(MENU_SET)\n");
231			}
232			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
233			{
234			unload_menu(p_bbs_menu_new);
235			free(p_bbs_menu_new);
236	sysadm	1.38	p_bbs_menu_new = NULL;
237	sysadm	1.33
238	sysadm	1.19	log_error("Reload menu failed\n");
239			}
240			else
241			{
242	sysadm	1.34	unload_menu(p_bbs_menu);
243			free(p_bbs_menu);
244
245			p_bbs_menu = p_bbs_menu_new;
246			p_bbs_menu_new = NULL;
247
248	sysadm	1.49	log_common("Reload menu successfully\n");
249	sysadm	1.19	}
250	sysadm	1.37
251			sd_notify(0, "READY=1");
252	sysadm	1.19	}
253
254	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
255			{
256			SYS_data_file_reload = 0;
257	sysadm	1.37	sd_notify(0, "RELOADING=1");
258	sysadm	1.35
259			for (int i = 0; i < data_files_load_startup_count; i++)
260			{
261	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
262	sysadm	1.35	{
263			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
264			}
265			}
266
267	sysadm	1.49	log_common("Reload data files successfully\n");
268	sysadm	1.37	sd_notify(0, "READY=1");
269	sysadm	1.35	}
270
271	sysadm	1.42	if (SYS_section_list_reload && !SYS_server_exit)
272			{
273			SYS_section_list_reload = 0;
274
275			if (section_list_loader_reload() < 0)
276			{
277			log_error("ksection_list_loader_reload() failed\n");
278			}
279			}
280
281	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
282	sysadm	1.22
283	sysadm	1.25	if (nfds < 0)
284	sysadm	1.19	{
285			if (errno != EINTR)
286			{
287	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
288			break;
289	sysadm	1.19	}
290			continue;
291			}
292	sysadm	1.13
293	sysadm	1.19	// Stop accept new connection on exit
294			if (SYS_server_exit)
295	sysadm	1.13	{
296			continue;
297			}
298
299	sysadm	1.25	for (int i = 0; i < nfds; i++)
300	sysadm	1.13	{
301	sysadm	1.25	if (events[i].data.fd == socket_server)
302	sysadm	1.13	{
303	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
304	sysadm	1.13	{
305	sysadm	1.25	socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
306			if (socket_client < 0)
307			{
308	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
309			{
310			break;
311			}
312			else if (errno == EINTR)
313			{
314			continue;
315			}
316			else
317	sysadm	1.25	{
318			log_error("accept(socket_server) error (%d)\n", errno);
319	sysadm	1.28	break;
320	sysadm	1.25	}
321			}
322
323			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
324			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
325
326			port_client = ntohs(sin.sin_port);
327
328	sysadm	1.49	log_common("Accept connection from %s:%d\n", hostaddr_client, port_client);
329	sysadm	1.25
330	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
331	sysadm	1.25	{
332	sysadm	1.44	j = 0;
333			for (i = 0; i < BBS_max_client; i++)
334			{
335			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
336			{
337			j++;
338			if (j >= BBS_max_client_per_ip)
339			{
340	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
341	sysadm	1.44	break;
342			}
343			}
344			}
345
346			if (j < BBS_max_client_per_ip)
347	sysadm	1.43	{
348	sysadm	1.51	if ((pid = fork_server(sshbind)) < 0)
349	sysadm	1.44	{
350			log_error("fork_server() error\n");
351			}
352			else if (pid > 0)
353			{
354			i = 0;
355			for (; i < BBS_max_client; i++)
356			{
357			if (process_sockaddr_pool[i].pid == 0)
358			{
359			break;
360			}
361			}
362
363			if (i >= BBS_max_client)
364			{
365			log_error("Process sockaddr pool depleted\n");
366			}
367			else
368			{
369			process_sockaddr_pool[i].pid = pid;
370			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
371			}
372			}
373	sysadm	1.43	}
374			}
375			else
376			{
377			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
378	sysadm	1.25	}
379
380			if (close(socket_client) == -1)
381			{
382			log_error("close(socket_lient) error (%d)\n", errno);
383			}
384	sysadm	1.13	}
385			}
386			}
387	sysadm	1.25	}
388	sysadm	1.13
389	sysadm	1.30	if (close(epollfd) < 0)
390			{
391			log_error("close(epoll) error (%d)\n");
392			}
393
394	sysadm	1.25	fcntl(socket_server, F_SETFL, flags);
395	sysadm	1.13
396			if (close(socket_server) == -1)
397			{
398			log_error("Close server socket failed\n");
399			}
400	sysadm	1.7
401	sysadm	1.51	ssh_bind_free(sshbind);
402			ssh_finalize();
403
404	sysadm	1.13	return 0;
405	sysadm	1.1	}
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