--- lbbs/src/net_server.c	2005/03/19 14:44:21	1.9
+++ lbbs/src/net_server.c	2025/06/05 09:13:22	1.54
@@ -1,93 +1,407 @@
 /***************************************************************************
-                          net_server.c  -  description
-                             -------------------
-    begin                : Mon Oct 11 2004
-    copyright            : (C) 2004 by Leaflet
-    email                : leaflet@leafok.com
+						  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 2 of the License, or     *
+ *   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 <netinet/in.h>
+#include <sys/wait.h>
+#include <sys/epoll.h>
 #include <arpa/inet.h>
+#include <netinet/in.h>
+#include <systemd/sd-daemon.h>
 
-int
-net_server (const char *hostaddr, unsigned int port)
+struct process_sockaddr_t
 {
-  int namelen, seq, netint;
-  struct sockaddr_in sin;
-  char temp[256];
-
-  socket_server = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
-
-  if (socket_server < 0)
-    {
-      log_error ("Create socket failed\n");
-      exit (1);
-    }
-
-  sin.sin_family = AF_INET;
-  sin.sin_addr.s_addr =
-    (strlen (hostaddr) > 0 ? inet_addr (hostaddr) : INADDR_ANY);
-  sin.sin_port = htons (port);
-
-  if (bind (socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
-    {
-      log_error ("Bind address %s:%u failed\n",
-        inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
-      exit (2);
-    }
-
-  if (listen (socket_server, 10) < 0)
-    {
-      log_error ("Socket listen failed\n");
-      exit (3);
-    }
-
-  strcpy(hostaddr_server, inet_ntoa(sin.sin_addr));
-  port_server = ntohs(sin.sin_port);
-  
-  log_std ("Listening at %s:%d\n", hostaddr_server, port_server);
-
-  namelen = sizeof (sin);
-  while(1)
-    {
-      if ((socket_client = accept (socket_server, (struct sockaddr *) &sin, &namelen)) < 0)
-        {
-          log_error ("Accept connection error\n");
-          continue;
-        }
-
-      strcpy (hostaddr_client, (const char *)inet_ntoa(sin.sin_addr));
-      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 error\n");
-        }
-      
-      if (close(socket_client) == -1)
-        {
-          log_error("Close client socket failed\n");
-        }
-    }
-
-  if (close(socket_server) == -1)
-    {
-      log_error("Close server socket failed\n");
-    }
+	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 %sconnection from %s:%d\n", (SSH_v2 ? "" : "SSH2 "), 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;
+	return 0;
 }