| 1 |
/***************************************************************************
|
| 2 |
net_server.c - description
|
| 3 |
-------------------
|
| 4 |
Copyright : (C) 2004-2025 by Leaflet
|
| 5 |
Email : leaflet@leafok.com
|
| 6 |
***************************************************************************/
|
| 7 |
|
| 8 |
/***************************************************************************
|
| 9 |
* *
|
| 10 |
* This program is free software; you can redistribute it and/or modify *
|
| 11 |
* it under the terms of the GNU General Public License as published by *
|
| 12 |
* the Free Software Foundation; either version 3 of the License, or *
|
| 13 |
* (at your option) any later version. *
|
| 14 |
* *
|
| 15 |
***************************************************************************/
|
| 16 |
|
| 17 |
#define _XOPEN_SOURCE 500
|
| 18 |
#define _POSIX_C_SOURCE 200809L
|
| 19 |
#define _GNU_SOURCE
|
| 20 |
|
| 21 |
#include "net_server.h"
|
| 22 |
#include "common.h"
|
| 23 |
#include "log.h"
|
| 24 |
#include "io.h"
|
| 25 |
#include "init.h"
|
| 26 |
#include "fork.h"
|
| 27 |
#include "menu.h"
|
| 28 |
#include "file_loader.h"
|
| 29 |
#include "section_list_loader.h"
|
| 30 |
#include <errno.h>
|
| 31 |
#include <fcntl.h>
|
| 32 |
#include <string.h>
|
| 33 |
#include <signal.h>
|
| 34 |
#include <stdlib.h>
|
| 35 |
#include <unistd.h>
|
| 36 |
#include <sys/syscall.h>
|
| 37 |
#include <sys/socket.h>
|
| 38 |
#include <sys/wait.h>
|
| 39 |
#include <sys/epoll.h>
|
| 40 |
#include <arpa/inet.h>
|
| 41 |
#include <netinet/in.h>
|
| 42 |
#include <systemd/sd-daemon.h>
|
| 43 |
#include <libssh/server.h>
|
| 44 |
|
| 45 |
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 |
static PROCESS_SOCKADDR process_sockaddr_pool[MAX_CLIENT_LIMIT];
|
| 53 |
|
| 54 |
int net_server(const char *hostaddr, in_port_t port)
|
| 55 |
{
|
| 56 |
ssh_bind sshbind;
|
| 57 |
unsigned int namelen;
|
| 58 |
int ret;
|
| 59 |
int flags;
|
| 60 |
struct sockaddr_in sin;
|
| 61 |
struct epoll_event ev, events[MAX_EVENTS];
|
| 62 |
int nfds, epollfd;
|
| 63 |
siginfo_t siginfo;
|
| 64 |
int sd_notify_stopping = 0;
|
| 65 |
MENU_SET *p_bbs_menu_new;
|
| 66 |
int i, j;
|
| 67 |
pid_t pid;
|
| 68 |
int ssh_log_level = SSH_LOG_NOLOG;
|
| 69 |
|
| 70 |
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 |
socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
| 85 |
|
| 86 |
if (socket_server < 0)
|
| 87 |
{
|
| 88 |
log_error("Create socket failed\n");
|
| 89 |
return -1;
|
| 90 |
}
|
| 91 |
|
| 92 |
sin.sin_family = AF_INET;
|
| 93 |
sin.sin_addr.s_addr = (hostaddr[0] != '\0' ? inet_addr(hostaddr) : INADDR_ANY);
|
| 94 |
sin.sin_port = htons(port);
|
| 95 |
|
| 96 |
// 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 |
if (bind(socket_server, (struct sockaddr *)&sin, sizeof(sin)) < 0)
|
| 108 |
{
|
| 109 |
log_error("Bind address %s:%u failed (%d)\n",
|
| 110 |
inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), errno);
|
| 111 |
return -1;
|
| 112 |
}
|
| 113 |
|
| 114 |
if (listen(socket_server, 10) < 0)
|
| 115 |
{
|
| 116 |
log_error("Socket listen failed (%d)\n", errno);
|
| 117 |
return -1;
|
| 118 |
}
|
| 119 |
|
| 120 |
strncpy(hostaddr_server, inet_ntoa(sin.sin_addr), sizeof(hostaddr_server) - 1);
|
| 121 |
hostaddr_server[sizeof(hostaddr_server) - 1] = '\0';
|
| 122 |
|
| 123 |
port_server = ntohs(sin.sin_port);
|
| 124 |
namelen = sizeof(sin);
|
| 125 |
|
| 126 |
log_common("Listening at %s:%d\n", hostaddr_server, port_server);
|
| 127 |
|
| 128 |
epollfd = epoll_create1(0);
|
| 129 |
if (epollfd < 0)
|
| 130 |
{
|
| 131 |
log_error("epoll_create1() error (%d)\n", errno);
|
| 132 |
return -1;
|
| 133 |
}
|
| 134 |
|
| 135 |
ev.events = EPOLLIN;
|
| 136 |
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 |
if (close(epollfd) < 0)
|
| 141 |
{
|
| 142 |
log_error("close(epoll) error (%d)\n");
|
| 143 |
}
|
| 144 |
return -1;
|
| 145 |
}
|
| 146 |
|
| 147 |
flags = fcntl(socket_server, F_GETFL, 0);
|
| 148 |
fcntl(socket_server, F_SETFL, flags | O_NONBLOCK);
|
| 149 |
|
| 150 |
// Startup complete
|
| 151 |
sd_notifyf(0, "READY=1\n"
|
| 152 |
"STATUS=Listening at %s:%d\n"
|
| 153 |
"MAINPID=%d",
|
| 154 |
hostaddr_server, port_server, getpid());
|
| 155 |
|
| 156 |
while (!SYS_server_exit || SYS_child_process_count > 0)
|
| 157 |
{
|
| 158 |
if (SYS_server_exit && !sd_notify_stopping)
|
| 159 |
{
|
| 160 |
sd_notify(0, "STOPPING=1");
|
| 161 |
sd_notify_stopping = 1;
|
| 162 |
}
|
| 163 |
|
| 164 |
while ((SYS_child_exit || SYS_server_exit) && SYS_child_process_count > 0)
|
| 165 |
{
|
| 166 |
SYS_child_exit = 0;
|
| 167 |
|
| 168 |
siginfo.si_pid = 0;
|
| 169 |
ret = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
|
| 170 |
if (ret == 0 && siginfo.si_pid > 0)
|
| 171 |
{
|
| 172 |
SYS_child_exit = 1; // Retry waitid
|
| 173 |
|
| 174 |
SYS_child_process_count--;
|
| 175 |
log_common("Child process (%d) exited\n", siginfo.si_pid);
|
| 176 |
|
| 177 |
if (siginfo.si_pid != section_list_loader_pid)
|
| 178 |
{
|
| 179 |
i = 0;
|
| 180 |
for (; i < BBS_max_client; i++)
|
| 181 |
{
|
| 182 |
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 |
}
|
| 192 |
}
|
| 193 |
}
|
| 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 |
if (SYS_server_exit && !SYS_child_exit && SYS_child_process_count > 0)
|
| 206 |
{
|
| 207 |
log_common("Notify %d child process to exit\n", SYS_child_process_count);
|
| 208 |
if (kill(0, SIGTERM) < 0)
|
| 209 |
{
|
| 210 |
log_error("Send SIGTERM signal failed (%d)\n", errno);
|
| 211 |
}
|
| 212 |
|
| 213 |
sd_notifyf(0, "STATUS=Waiting for %d child process to exit", SYS_child_process_count);
|
| 214 |
}
|
| 215 |
|
| 216 |
if (SYS_conf_reload && !SYS_server_exit)
|
| 217 |
{
|
| 218 |
SYS_conf_reload = 0;
|
| 219 |
sd_notify(0, "RELOADING=1");
|
| 220 |
|
| 221 |
// Reload configuration
|
| 222 |
if (load_conf(CONF_BBSD) < 0)
|
| 223 |
{
|
| 224 |
log_error("Reload conf failed\n");
|
| 225 |
}
|
| 226 |
|
| 227 |
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 |
p_bbs_menu_new = NULL;
|
| 237 |
|
| 238 |
log_error("Reload menu failed\n");
|
| 239 |
}
|
| 240 |
else
|
| 241 |
{
|
| 242 |
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 |
log_common("Reload menu successfully\n");
|
| 249 |
}
|
| 250 |
|
| 251 |
sd_notify(0, "READY=1");
|
| 252 |
}
|
| 253 |
|
| 254 |
if (SYS_data_file_reload && !SYS_server_exit)
|
| 255 |
{
|
| 256 |
SYS_data_file_reload = 0;
|
| 257 |
sd_notify(0, "RELOADING=1");
|
| 258 |
|
| 259 |
for (int i = 0; i < data_files_load_startup_count; i++)
|
| 260 |
{
|
| 261 |
if (load_file(data_files_load_startup[i]) < 0)
|
| 262 |
{
|
| 263 |
log_error("load_file_mmap(%s) error\n", data_files_load_startup[i]);
|
| 264 |
}
|
| 265 |
}
|
| 266 |
|
| 267 |
log_common("Reload data files successfully\n");
|
| 268 |
sd_notify(0, "READY=1");
|
| 269 |
}
|
| 270 |
|
| 271 |
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 |
nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
|
| 282 |
|
| 283 |
if (nfds < 0)
|
| 284 |
{
|
| 285 |
if (errno != EINTR)
|
| 286 |
{
|
| 287 |
log_error("epoll_wait() error (%d)\n", errno);
|
| 288 |
break;
|
| 289 |
}
|
| 290 |
continue;
|
| 291 |
}
|
| 292 |
|
| 293 |
// Stop accept new connection on exit
|
| 294 |
if (SYS_server_exit)
|
| 295 |
{
|
| 296 |
continue;
|
| 297 |
}
|
| 298 |
|
| 299 |
for (int i = 0; i < nfds; i++)
|
| 300 |
{
|
| 301 |
if (events[i].data.fd == socket_server)
|
| 302 |
{
|
| 303 |
while (!SYS_server_exit) // Accept all incoming connections until error
|
| 304 |
{
|
| 305 |
socket_client = accept(socket_server, (struct sockaddr *)&sin, &namelen);
|
| 306 |
if (socket_client < 0)
|
| 307 |
{
|
| 308 |
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
| 309 |
{
|
| 310 |
break;
|
| 311 |
}
|
| 312 |
else if (errno == EINTR)
|
| 313 |
{
|
| 314 |
continue;
|
| 315 |
}
|
| 316 |
else
|
| 317 |
{
|
| 318 |
log_error("accept(socket_server) error (%d)\n", errno);
|
| 319 |
break;
|
| 320 |
}
|
| 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 |
log_common("Accept connection from %s:%d\n", hostaddr_client, port_client);
|
| 329 |
|
| 330 |
if (SYS_child_process_count - 1 < BBS_max_client)
|
| 331 |
{
|
| 332 |
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 |
log_common("Too many client connections (%d) from %s\n", j, hostaddr_client);
|
| 341 |
break;
|
| 342 |
}
|
| 343 |
}
|
| 344 |
}
|
| 345 |
|
| 346 |
if (j < BBS_max_client_per_ip)
|
| 347 |
{
|
| 348 |
if ((pid = fork_server(sshbind)) < 0)
|
| 349 |
{
|
| 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 |
}
|
| 374 |
}
|
| 375 |
else
|
| 376 |
{
|
| 377 |
log_error("Rejected client connection over limit (%d)\n", SYS_child_process_count - 1);
|
| 378 |
}
|
| 379 |
|
| 380 |
if (close(socket_client) == -1)
|
| 381 |
{
|
| 382 |
log_error("close(socket_lient) error (%d)\n", errno);
|
| 383 |
}
|
| 384 |
}
|
| 385 |
}
|
| 386 |
}
|
| 387 |
}
|
| 388 |
|
| 389 |
if (close(epollfd) < 0)
|
| 390 |
{
|
| 391 |
log_error("close(epoll) error (%d)\n");
|
| 392 |
}
|
| 393 |
|
| 394 |
fcntl(socket_server, F_SETFL, flags);
|
| 395 |
|
| 396 |
if (close(socket_server) == -1)
|
| 397 |
{
|
| 398 |
log_error("Close server socket failed\n");
|
| 399 |
}
|
| 400 |
|
| 401 |
ssh_bind_free(sshbind);
|
| 402 |
ssh_finalize();
|
| 403 |
|
| 404 |
return 0;
|
| 405 |
}
|
Parent Directory
| 
Revision Log