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/***************************************************************************
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net_server.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#define _XOPEN_SOURCE 500
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#define _POSIX_C_SOURCE 200809L
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#define _GNU_SOURCE
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#include "net_server.h"
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#include "common.h"
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#include "log.h"
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#include "io.h"
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#include "init.h"
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#include "fork.h"
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#include "menu.h"
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#include "file_loader.h"
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#include "section_list_loader.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/epoll.h>
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#include <arpa/inet.h>
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#include <systemd/sd-daemon.h>
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#include <libssh/libssh.h>
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#include <libssh/server.h>
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struct process_sockaddr_t
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{
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pid_t pid;
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in_addr_t s_addr;
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};
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typedef struct process_sockaddr_t PROCESS_SOCKADDR;
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static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENTS_LIMIT];
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int net_server(const char *hostaddr, in_port_t port)
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{
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unsigned int namelen;
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int ret;
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int flags;
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struct sockaddr_in sin;
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struct epoll_event ev, events[MAX_EVENTS];
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int nfds, epollfd;
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siginfo_t siginfo;
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int sd_notify_stopping = 0;
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MENU_SET *p_bbs_menu_new;
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int i, j;
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pid_t pid;
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socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (socket_server < 0)
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{
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log_error("Create socket failed\n");
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return -1;
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}
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
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sin.sin_port = htons(port);
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// Reuse address and port
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flags = 1;
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if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
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{
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log_error("setsockopt SO_REUSEADDR error (%d)\n", errno);
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}
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if (setsockopt(socket_server, SOL_SOCKET, SO_REUSEPORT, &flags, sizeof(flags)) < 0)
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{
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log_error("setsockopt SO_REUSEPORT error (%d)\n", errno);
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}
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if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
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{
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log_error("Bind address %s:%u failed (%d)\n",
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inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
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return -1;
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}
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if (listen(socket_server, 10) < 0)
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{
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log_error("Socket listen failed (%d)\n", errno);
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return -1;
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}
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strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
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hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
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port_server = ntohs(sin.sin_port);
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namelen = sizeof(sin);
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log_std("Listening at %s:%d\n", hostaddr_server, port_server);
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epollfd = epoll_create1(0);
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if (epollfd < 0)
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{
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log_error("epoll_create1() error (%d)\n", errno);
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return -1;
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}
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ev.events = EPOLLIN;
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ev.data.fd = socket_server;
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if (epoll_ctl(epollfd, EPOLL_CTL_ADD, socket_server, &ev) == -1)
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{
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log_error("epoll_ctl(socket_server) error (%d)\n", errno);
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if (close(epollfd) < 0)
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{
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log_error("close(epoll) error (%d)\n");
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}
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return -1;
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}
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flags = fcntl(socket_server, F_GETFL, 0);
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fcntl(socket_server, F_SETFL, flags | O_NONBLOCK);
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// Startup complete
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sd_notifyf(0, "READY=1\n"
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"STATUS=Listening at %s:%d\n"
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"MAINPID=%d",
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hostaddr_server, port_server, getpid());
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while (!SYS_server_exit || SYS_child_process_count > 0)
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{
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if (SYS_server_exit && !sd_notify_stopping)
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{
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sd_notify(0, "STOPPING=1");
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sd_notify_stopping = 1;
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}
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while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
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{
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SYS_child_exit = 0;
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siginfo.si_pid = 0;
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ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
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if (ret == 0 && siginfo.si_pid > 0)
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{
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SYS_child_exit = 1; // Retry waitid
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SYS_child_process_count--;
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log_std("Child process (%d) exited\n", siginfo.si_pid);
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if (siginfo.si_pid != section_list_loader_pid)
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{
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i = 0;
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for (; i < BBS_max_client; i++)
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{
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if (process_sockaddr_pool[i].pid == siginfo.si_pid)
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{
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process_sockaddr_pool[i].pid = 0;
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break;
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}
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}
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if (i >= BBS_max_client)
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{
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log_error("Child process (%d) not found in process sockaddr pool\n", siginfo.si_pid);
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}
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}
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}
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else if (ret == 0)
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{
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break;
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}
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else if (ret < 0)
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{
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log_error("Error in waitid: %d\n", errno);
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break;
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}
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}
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if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
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{
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log_std("Notify %d child process to exit\n", SYS_child_process_count);
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if (kill(0, SIGTERM) < 0)
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{
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log_error("Send SIGTERM signal failed (%d)\n", errno);
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}
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sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
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}
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if (SYS_conf_reload && !SYS_server_exit)
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{
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SYS_conf_reload = 0;
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sd_notify(0, "RELOADING=1");
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// Reload configuration
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if (load_conf(CONF_BBSD) < 0)
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{
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log_error("Reload conf failed\n");
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}
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p_bbs_menu_new = calloc(1, sizeof(MENU_SET));
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if (p_bbs_menu_new == NULL)
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{
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log_error("OOM: calloc(MENU_SET)\n");
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}
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else if (load_menu(p_bbs_menu_new, CONF_MENU) < 0)
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{
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unload_menu(p_bbs_menu_new);
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free(p_bbs_menu_new);
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p_bbs_menu_new = NULL;
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log_error("Reload menu failed\n");
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}
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else
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{
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unload_menu(p_bbs_menu);
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free(p_bbs_menu);
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p_bbs_menu = p_bbs_menu_new;
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p_bbs_menu_new = NULL;
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log_std("Reload menu successfully\n");
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}
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sd_notify(0, "READY=1");
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}
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if (SYS_data_file_reload && !SYS_server_exit)
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{
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SYS_data_file_reload = 0;
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sd_notify(0, "RELOADING=1");
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for (int i = 0; i < data_files_load_startup_count; i++)
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{
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if (load_file(data_files_load_startup[i]) < 0)
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{
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log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
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}
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}
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log_std("Reload data files successfully\n");
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sd_notify(0, "READY=1");
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}
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if (SYS_section_list_reload && !SYS_server_exit)
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{
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SYS_section_list_reload = 0;
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if (section_list_loader_reload() < 0)
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{
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log_error("ksection_list_loader_reload() failed\n");
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}
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}
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nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
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if (nfds < 0)
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{
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if (errno != EINTR)
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{
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log_error("epoll_wait() error (%d)\n", errno);
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break;
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}
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continue;
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}
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// Stop accept new connection on exit
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if (SYS_server_exit)
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{
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continue;
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}
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for (int i = 0; i < nfds; i++)
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{
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if (events[i].data.fd == socket_server)
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{
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while (!SYS_server_exit) // Accept all incoming connections until error
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{
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socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
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if (socket_client < 0)
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{
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if (errno == EAGAIN || errno == EWOULDBLOCK)
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{
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break;
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}
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else if (errno == EINTR)
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{
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continue;
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}
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else
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{
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log_error("accept(socket_server) error (%d)\n", errno);
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break;
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}
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}
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strncpy(hostaddr_client, inet_ntoa(sin.sin_addr), sizeof(hostaddr_client) - 1);
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hostaddr_client[sizeof(hostaddr_client) - 1] = '\0';
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port_client = ntohs(sin.sin_port);
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log_std("Accept connection from %s:%d\n", hostaddr_client, port_client);
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if (SYS_child_process_count - 1 < BBS_max_client)
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{
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j = 0;
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for (i = 0; i < BBS_max_client; i++)
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{
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if (process_sockaddr_pool[i].pid != 0 && process_sockaddr_pool[i].s_addr == sin.sin_addr.s_addr)
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{
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j++;
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if (j >= BBS_max_client_per_ip)
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{
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log_error("Too many client connections (%d) from %s\n", j, hostaddr_client);
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break;
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}
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}
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}
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if (j < BBS_max_client_per_ip)
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{
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if ((pid = fork_server()) < 0)
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{
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log_error("fork_server() error\n");
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}
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else if (pid > 0)
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{
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i = 0;
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for (; i < BBS_max_client; i++)
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{
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if (process_sockaddr_pool[i].pid == 0)
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{
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break;
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}
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}
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if (i >= BBS_max_client)
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{
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log_error("Process sockaddr pool depleted\n");
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}
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else
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{
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process_sockaddr_pool[i].pid = pid;
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process_sockaddr_pool[i].s_addr = sin.sin_addr.s_addr;
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}
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}
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}
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}
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else
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{
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log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
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}
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if (close(socket_client) == -1)
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{
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log_error("close(socket_lient) error (%d)\n", errno);
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}
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}
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}
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}
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}
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if (close(epollfd) < 0)
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{
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log_error("close(epoll) error (%d)\n");
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}
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fcntl(socket_server, F_SETFL, flags);
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if (close(socket_server) == -1)
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{
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log_error("Close server socket failed\n");
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}
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return 0;
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}
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