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>

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[])
{
        unsigned int addrlen;
        int ret;
        int flags[2];
        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;
        }

        epollfd = epoll_create1(0);
        if (epollfd < 0)
        {
                log_error("epoll_create1() error (%d)\n", errno);
                return -1;
        }

        // Server socket
        for (i = 0; i < 2; i++)
        {
                socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

                if (socket_server[i] < 0)
                {
                        log_error("Create socket_server error (%d)\n", errno);
                        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[i]);

                // Reuse address and port
                flags[i] = 1;
                if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
                {
                        log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
                }
                if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
                {
                        log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
                }

                if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
                {
                        log_error("Bind address %s:%u error (%d)\n",
                                          inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
                        return -1;
                }

                if (listen(socket_server[i], 10) < 0)
                {
                        log_error("Telnet socket listen error (%d)\n", errno);
                        return -1;
                }

                log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));

                ev.events = EPOLLIN;
                ev.data.fd = socket_server[i];
                if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
                {
                        log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
                        if (close(epollfd) < 0)
                        {
                                log_error("close(epoll) error (%d)\n");
                        }
                        return -1;
                }

                flags[i] = fcntl(socket_server[i], F_GETFL, 0);
                fcntl(socket_server[i], F_SETFL, flags[i] | O_NONBLOCK);
        }

        // Startup complete
        sd_notifyf(0, "READY=1\n"
                                  "STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
                                  "MAINPID=%d",
                           hostaddr, port[0], hostaddr, port[1], 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[0] || events[i].data.fd == socket_server[1])
                        {
                                SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);

                                while (!SYS_server_exit) // Accept all incoming connections until error
                                {
                                        addrlen = sizeof(sin);
                                        socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
                                        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()) < 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");
        }

        for (i = 0; i < 2; i++)
        {
                fcntl(socket_server[i], F_SETFL, flags[i]);

                if (close(socket_server[i]) == -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	1.3
44	sysadm	1.44	struct process_sockaddr_t
45			{
46			pid_t pid;
47			in_addr_t s_addr;
48			};
49			typedef struct process_sockaddr_t PROCESS_SOCKADDR;
50
51	sysadm	1.48	static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
52	sysadm	1.44
53	sysadm	1.52	int net_server(const char *hostaddr, in_port_t port[])
54	sysadm	1.1	{
55	sysadm	1.52	unsigned int addrlen;
56	sysadm	1.19	int ret;
57	sysadm	1.52	int flags[2];
58	sysadm	1.13	struct sockaddr_in sin;
59	sysadm	1.25	struct epoll_event ev, events[MAX_EVENTS];
60			int nfds, epollfd;
61	sysadm	1.19	siginfo_t siginfo;
62	sysadm	1.31	int sd_notify_stopping = 0;
63	sysadm	1.34	MENU_SET *p_bbs_menu_new;
64	sysadm	1.44	int i, j;
65			pid_t pid;
66	sysadm	1.51	int ssh_log_level = SSH_LOG_NOLOG;
67	sysadm	1.10
68	sysadm	1.51	ssh_init();
69
70			sshbind = ssh_bind_new();
71
72			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
73			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
74			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_KEYFILE) < 0 \|\|
75			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
76			{
77			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
78			ssh_bind_free(sshbind);
79			return -1;
80			}
81	sysadm	1.10
82	sysadm	1.52	epollfd = epoll_create1(0);
83			if (epollfd < 0)
84	sysadm	1.13	{
85	sysadm	1.52	log_error("epoll_create1() error (%d)\n", errno);
86	sysadm	1.27	return -1;
87	sysadm	1.13	}
88	sysadm	1.10
89	sysadm	1.52	// Server socket
90			for (i = 0; i < 2; i++)
91	sysadm	1.23	{
92	sysadm	1.52	socket_server[i] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
93	sysadm	1.23
94	sysadm	1.52	if (socket_server[i] < 0)
95			{
96			log_error("Create socket_server error (%d)\n", errno);
97			return -1;
98			}
99	sysadm	1.10
100	sysadm	1.52	sin.sin_family = AF_INET;
101			sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
102			sin.sin_port = htons(port[i]);
103
104			// Reuse address and port
105			flags[i] = 1;
106			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEADDR, &flags[i], sizeof(flags[i])) < 0)
107			{
108			log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
109			}
110			if (setsockopt(socket_server[i], SOL_SOCKET, SO_REUSEPORT, &flags[i], sizeof(flags[i])) < 0)
111			{
112			log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
113			}
114	sysadm	1.1
115	sysadm	1.52	if (bind(socket_server[i], (struct sockaddr *)&sin, sizeof(sin)) < 0)
116			{
117			log_error("Bind address %s:%u error (%d)\n",
118			inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
119			return -1;
120			}
121	sysadm	1.16
122	sysadm	1.52	if (listen(socket_server[i], 10) < 0)
123			{
124			log_error("Telnet socket listen error (%d)\n", errno);
125			return -1;
126			}
127	sysadm	1.13
128	sysadm	1.52	log_common("Listening at %s:%u\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
129	sysadm	1.25
130	sysadm	1.52	ev.events = EPOLLIN;
131			ev.data.fd = socket_server[i];
132			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server[i], &ev) == -1)
133	sysadm	1.30	{
134	sysadm	1.52	log_error("epoll_ctl(socket_server[%d]) error (%d)\n", i, errno);
135			if (close(epollfd) < 0)
136			{
137			log_error("close(epoll) error (%d)\n");
138			}
139			return -1;
140	sysadm	1.30	}
141	sysadm	1.52
142			flags[i] = fcntl(socket_server[i], F_GETFL, 0);
143			fcntl(socket_server[i], F_SETFL, flags[i] \| O_NONBLOCK);
144	sysadm	1.25	}
145
146	sysadm	1.31	// Startup complete
147			sd_notifyf(0, "READY=1\n"
148	sysadm	1.52	"STATUS=Listening at %s:%d (Telnet) and %s:%d (SSH2)\n"
149	sysadm	1.31	"MAINPID=%d",
150	sysadm	1.52	hostaddr, port[0], hostaddr, port[1], getpid());
151	sysadm	1.31
152	sysadm	1.19	while (!SYS_server_exit \|\| SYS_child_process_count > 0)
153	sysadm	1.13	{
154	sysadm	1.31	if (SYS_server_exit && !sd_notify_stopping)
155			{
156			sd_notify(0, "STOPPING=1");
157			sd_notify_stopping = 1;
158			}
159	sysadm	1.37
160	sysadm	1.22	while ((SYS_child_exit \|\| SYS_server_exit) && SYS_child_process_count > 0)
161	sysadm	1.19	{
162	sysadm	1.30	SYS_child_exit = 0;
163
164	sysadm	1.19	siginfo.si_pid = 0;
165			ret = waitid(P_ALL, 0, &siginfo, WEXITED \| WNOHANG);
166			if (ret == 0 && siginfo.si_pid > 0)
167			{
168	sysadm	1.30	SYS_child_exit = 1; // Retry waitid
169
170	sysadm	1.19	SYS_child_process_count--;
171	sysadm	1.49	log_common("Child process (%d) exited\n", siginfo.si_pid);
172	sysadm	1.44
173	sysadm	1.45	if (siginfo.si_pid != section_list_loader_pid)
174	sysadm	1.44	{
175	sysadm	1.45	i = 0;
176			for (; i < BBS_max_client; i++)
177	sysadm	1.44	{
178	sysadm	1.45	if (process_sockaddr_pool[i].pid == siginfo.si_pid)
179			{
180			process_sockaddr_pool[i].pid = 0;
181			break;
182			}
183			}
184			if (i >= BBS_max_client)
185			{
186			log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
187	sysadm	1.44	}
188			}
189	sysadm	1.19	}
190			else if (ret == 0)
191			{
192			break;
193			}
194			else if (ret < 0)
195			{
196			log_error("Error in waitid: %d\n", errno);
197			break;
198			}
199			}
200
201	sysadm	1.22	if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
202	sysadm	1.21	{
203	sysadm	1.49	log_common("Notify %d child process to exit\n", SYS_child_process_count);
204	sysadm	1.21	if (kill(0, SIGTERM) < 0)
205			{
206			log_error("Send SIGTERM signal failed (%d)\n", errno);
207			}
208	sysadm	1.31
209			sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
210	sysadm	1.21	}
211
212	sysadm	1.44	if (SYS_conf_reload && !SYS_server_exit)
213	sysadm	1.19	{
214	sysadm	1.44	SYS_conf_reload = 0;
215	sysadm	1.37	sd_notify(0, "RELOADING=1");
216	sysadm	1.30
217	sysadm	1.44	// Reload configuration
218			if (load_conf(CONF_BBSD) < 0)
219			{
220			log_error("Reload conf failed\n");
221			}
222
223	sysadm	1.34	p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
224			if (p_bbs_menu_new == NULL)
225			{
226			log_error("OOM: calloc(MENU_SET)\n");
227			}
228			else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
229			{
230			unload_menu(p_bbs_menu_new);
231			free(p_bbs_menu_new);
232	sysadm	1.38	p_bbs_menu_new = NULL;
233	sysadm	1.33
234	sysadm	1.19	log_error("Reload menu failed\n");
235			}
236			else
237			{
238	sysadm	1.34	unload_menu(p_bbs_menu);
239			free(p_bbs_menu);
240
241			p_bbs_menu = p_bbs_menu_new;
242			p_bbs_menu_new = NULL;
243
244	sysadm	1.49	log_common("Reload menu successfully\n");
245	sysadm	1.19	}
246	sysadm	1.37
247			sd_notify(0, "READY=1");
248	sysadm	1.19	}
249
250	sysadm	1.35	if (SYS_data_file_reload && !SYS_server_exit)
251			{
252			SYS_data_file_reload = 0;
253	sysadm	1.37	sd_notify(0, "RELOADING=1");
254	sysadm	1.35
255			for (int i = 0; i < data_files_load_startup_count; i++)
256			{
257	sysadm	1.39	if (load_file(data_files_load_startup[i]) < 0)
258	sysadm	1.35	{
259			log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
260			}
261			}
262
263	sysadm	1.49	log_common("Reload data files successfully\n");
264	sysadm	1.37	sd_notify(0, "READY=1");
265	sysadm	1.35	}
266
267	sysadm	1.42	if (SYS_section_list_reload && !SYS_server_exit)
268			{
269			SYS_section_list_reload = 0;
270
271			if (section_list_loader_reload() < 0)
272			{
273			log_error("ksection_list_loader_reload() failed\n");
274			}
275			}
276
277	sysadm	1.25	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
278	sysadm	1.22
279	sysadm	1.25	if (nfds < 0)
280	sysadm	1.19	{
281			if (errno != EINTR)
282			{
283	sysadm	1.25	log_error("epoll_wait() error (%d)\n", errno);
284			break;
285	sysadm	1.19	}
286			continue;
287			}
288	sysadm	1.13
289	sysadm	1.19	// Stop accept new connection on exit
290			if (SYS_server_exit)
291	sysadm	1.13	{
292			continue;
293			}
294
295	sysadm	1.25	for (int i = 0; i < nfds; i++)
296	sysadm	1.13	{
297	sysadm	1.52	if (events[i].data.fd == socket_server[0] \|\| events[i].data.fd == socket_server[1])
298	sysadm	1.13	{
299	sysadm	1.53	SSH_v2 = (events[i].data.fd == socket_server[1] ? 1 : 0);
300	sysadm	1.52
301	sysadm	1.29	while (!SYS_server_exit) // Accept all incoming connections until error
302	sysadm	1.13	{
303	sysadm	1.52	addrlen = sizeof(sin);
304	sysadm	1.53	socket_client = accept(socket_server[SSH_v2], (struct sockaddr *)&sin, &addrlen);
305	sysadm	1.25	if (socket_client < 0)
306			{
307	sysadm	1.28	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
308			{
309			break;
310			}
311			else if (errno == EINTR)
312			{
313			continue;
314			}
315			else
316	sysadm	1.25	{
317			log_error("accept(socket_server) error (%d)\n", errno);
318	sysadm	1.28	break;
319	sysadm	1.25	}
320			}
321
322			strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
323			hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
324
325			port_client = ntohs(sin.sin_port);
326
327	sysadm	1.49	log_common("Accept connection from %s:%d\n", hostaddr_client, port_client);
328	sysadm	1.25
329	sysadm	1.43	if (SYS_child_process_count - 1 < BBS_max_client)
330	sysadm	1.25	{
331	sysadm	1.44	j = 0;
332			for (i = 0; i < BBS_max_client; i++)
333			{
334			if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
335			{
336			j++;
337			if (j >= BBS_max_client_per_ip)
338			{
339	sysadm	1.50	log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
340	sysadm	1.44	break;
341			}
342			}
343			}
344
345			if (j < BBS_max_client_per_ip)
346	sysadm	1.43	{
347	sysadm	1.52	if ((pid = fork_server()) < 0)
348	sysadm	1.44	{
349			log_error("fork_server() error\n");
350			}
351			else if (pid > 0)
352			{
353			i = 0;
354			for (; i < BBS_max_client; i++)
355			{
356			if (process_sockaddr_pool[i].pid == 0)
357			{
358			break;
359			}
360			}
361
362			if (i >= BBS_max_client)
363			{
364			log_error("Process sockaddr pool depleted\n");
365			}
366			else
367			{
368			process_sockaddr_pool[i].pid = pid;
369			process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
370			}
371			}
372	sysadm	1.43	}
373			}
374			else
375			{
376			log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
377	sysadm	1.25	}
378
379			if (close(socket_client) == -1)
380			{
381			log_error("close(socket_lient) error (%d)\n", errno);
382			}
383	sysadm	1.13	}
384			}
385			}
386	sysadm	1.25	}
387	sysadm	1.13
388	sysadm	1.30	if (close(epollfd) < 0)
389			{
390			log_error("close(epoll) error (%d)\n");
391			}
392
393	sysadm	1.52	for (i = 0; i < 2; i++)
394			{
395			fcntl(socket_server[i], F_SETFL, flags[i]);
396	sysadm	1.13
397	sysadm	1.52	if (close(socket_server[i]) == -1)
398			{
399			log_error("Close server socket failed\n");
400			}
401	sysadm	1.13	}
402	sysadm	1.7
403	sysadm	1.51	ssh_bind_free(sshbind);
404			ssh_finalize();
405
406	sysadm	1.13	return 0;
407	sysadm	1.1	}
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