src/web_server.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <netinet/in.h>
   9 #include <arpa/inet.h>
  10 #include <errno.h>
  11 #include <pthread.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <netinet/tcp.h>
  15 #include <malloc.h>
  16 #include <poll.h>
  17
  18 #include "common.h"
  19 #include "log.h"
  20 #include "appconfig.h"
  21 #include "url.h"
  22 #include "web_buffer.h"
  23 #include "web_client.h"
  24 #include "web_server.h"
  25 #include "global_statistics.h"
  26 #include "rrd.h"
  27 #include "rrd2json.h"
  28 #include "../config.h"
  29
  30 int listen_backlog = LISTEN_BACKLOG;
  31 int listen_fd = -1;
  32 int listen_port = LISTEN_PORT;
  33 int web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
  34
  35 #ifdef NETDATA_INTERNAL_CHECKS
  36 static void log_allocations(void)
  37 {
  38         static int mem = 0;
  39
  40         struct mallinfo mi;
  41
  42         mi = mallinfo();
  43         if(mi.uordblks > mem) {
  44                 int clients = 0;
  45                 struct web_client *w;
  46                 for(w = web_clients; w ; w = w->next) clients++;
  47
  48                 info("Allocated memory increased from %d to %d (increased by %d bytes). There are %d web clients connected.", mem, mi.uordblks, mi.uordblks - mem, clients);
  49                 mem = mi.uordblks;
  50         }
  51 }
  52 #endif
  53
  54 #ifndef HAVE_ACCEPT4
  55 int accept4(int sock, struct sockaddr *addr, socklen_t *addrlen, int flags) {
  56         int fd = accept(sock, addr, addrlen);
  57         int newflags = 0;
  58
  59         if (fd < 0) return fd;
  60
  61         if (flags & SOCK_NONBLOCK) {
  62                 newflags |= O_NONBLOCK;
  63                 flags &= ~SOCK_NONBLOCK;
  64         }
  65
  66         if (flags & SOCK_CLOEXEC) {
  67                 newflags |= O_CLOEXEC;
  68                 flags &= ~SOCK_CLOEXEC;
  69         }
  70
  71         if (flags) {
  72                 errno = -EINVAL;
  73                 return -1;
  74         }
  75
  76         if (fcntl(fd, F_SETFL, newflags) < 0) {
  77                 int saved_errno = errno;
  78                 close(fd);
  79                 errno = saved_errno;
  80                 return -1;
  81         }
  82
  83         return fd;
  84 }
  85 #endif
  86
  87 static int is_ip_anything(const char *ip)
  88 {
  89         if(!ip || !*ip
  90                         || !strcmp(ip, "any")
  91                         || !strcmp(ip, "all")
  92                         || !strcmp(ip, "*")
  93                         || !strcmp(ip, "::")
  94                         || !strcmp(ip, "0.0.0.0")
  95                         ) return 1;
  96
  97         return 0;
  98 }
  99
 100 int create_listen_socket4(const char *ip, int port, int listen_backlog)
 101 {
 102         int sock;
 103         int sockopt = 1;
 104
 105         debug(D_LISTENER, "IPv4 creating new listening socket on port %d", port);
 106
 107         sock = socket(AF_INET, SOCK_STREAM, 0);
 108         if(sock < 0) {
 109                 error("IPv4 socket() failed.");
 110                 return -1;
 111         }
 112
 113         /* avoid "address already in use" */
 114         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));
 115
 116         struct sockaddr_in name;
 117         memset(&name, 0, sizeof(struct sockaddr_in));
 118         name.sin_family = AF_INET;
 119         name.sin_port = htons (port);
 120
 121         if(is_ip_anything(ip)) {
 122                 name.sin_addr.s_addr = htonl(INADDR_ANY);
 123                 // info("Listening on any IPs (IPv4).");
 124         }
 125         else {
 126                 int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);
 127                 if(ret != 1) {
 128                         error("Failed to convert IP '%s' to a valid IPv4 address.", ip);
 129                         close(sock);
 130                         return -1;
 131                 }
 132                 // info("Listening on IP '%s' (IPv4).", ip);
 133         }
 134
 135         if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
 136                 close(sock);
 137                 error("IPv4 bind() failed.");
 138                 return -1;
 139         }
 140
 141         if(listen(sock, listen_backlog) < 0) {
 142                 close(sock);
 143                 fatal("IPv4 listen() failed.");
 144                 return -1;
 145         }
 146
 147         debug(D_LISTENER, "IPv4 listening port %d created", port);
 148         return sock;
 149 }
 150
 151 int create_listen_socket6(const char *ip, int port, int listen_backlog)
 152 {
 153         int sock = -1;
 154         int sockopt = 1;
 155
 156         debug(D_LISTENER, "IPv6 creating new listening socket on port %d", port);
 157
 158         sock = socket(AF_INET6, SOCK_STREAM, 0);
 159         if (sock < 0) {
 160                 error("IPv6 socket() failed. Disabling IPv6.");
 161                 return -1;
 162         }
 163
 164         /* avoid "address already in use" */
 165         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));
 166
 167         struct sockaddr_in6 name;
 168         memset(&name, 0, sizeof(struct sockaddr_in6));
 169         name.sin6_family = AF_INET6;
 170         name.sin6_port = htons ((uint16_t) port);
 171
 172         if(is_ip_anything(ip)) {
 173                 name.sin6_addr = in6addr_any;
 174                 // info("Listening on all IPs (IPv6 and IPv4)");
 175         }
 176         else {
 177                 int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);
 178                 if(ret != 1) {
 179                         error("Failed to convert IP '%s' to a valid IPv6 address. Disabling IPv6.", ip);
 180                         close(sock);
 181                         return -1;
 182                 }
 183                 // info("Listening on IP '%s' (IPv6)", ip);
 184         }
 185
 186         name.sin6_scope_id = 0;
 187
 188         if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
 189                 close(sock);
 190                 error("IPv6 bind() failed. Disabling IPv6.");
 191                 return -1;
 192         }
 193
 194         if (listen(sock, listen_backlog) < 0) {
 195                 close(sock);
 196                 error("IPv6 listen() failed. Disabling IPv6.");
 197                 return -1;
 198         }
 199
 200         debug(D_LISTENER, "IPv6 listening port %d created", port);
 201         return sock;
 202 }
 203
 204
 205 int create_listen_socket(void) {
 206         listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 207
 208         listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 209         if(listen_port < 1 || listen_port > 65535) {
 210                 error("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 211                 listen_port = LISTEN_PORT;
 212         }
 213         else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 214
 215         int ip = 0;
 216         char *ipv = config_get("global", "ip version", "any");
 217         if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 218         else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 219         else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 220         else error("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 221
 222         if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 223         if(listen_fd < 0) {
 224                 listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 225                 // if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 226         }
 227
 228         return listen_fd;
 229 }
 230
 231 // --------------------------------------------------------------------------------------
 232 // the main socket listener
 233
 234 // 1. it accepts new incoming requests on our port
 235 // 2. creates a new web_client for each connection received
 236 // 3. spawns a new pthread to serve the client (this is optimal for keep-alive clients)
 237 // 4. cleans up old web_clients that their pthreads have been exited
 238
 239 #define CLEANUP_EVERY_EVENTS 100
 240
 241 void *socket_listen_main_multi_threaded(void *ptr) {
 242         (void)ptr;
 243
 244         web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
 245         info("Multi-threaded WEB SERVER thread created with task id %d", gettid());
 246
 247         struct web_client *w;
 248         int retval, failures = 0, counter = 0;
 249
 250         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 251                 error("Cannot set pthread cancel type to DEFERRED.");
 252
 253         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 254                 error("Cannot set pthread cancel state to ENABLE.");
 255
 256         if(listen_fd < 0)
 257                 fatal("LISTENER: Listen socket %d is not ready, or invalid.", listen_fd);
 258
 259         for(;;) {
 260                 struct pollfd fd = { .fd = listen_fd, .events = POLLIN, .revents = 0 };
 261                 int timeout = 10 * 1000;
 262
 263                 // debug(D_WEB_CLIENT, "LISTENER: Waiting...");
 264                 retval = poll(&fd, 1, timeout);
 265
 266                 if(unlikely(retval == -1)) {
 267                         debug(D_WEB_CLIENT, "LISTENER: poll() failed.");
 268                         failures++;
 269
 270                         if(failures > 10) {
 271                                 error("LISTENER: our listen port %d seems dead. Re-opening it.", listen_fd);
 272                                 close(listen_fd);
 273                                 listen_fd = -1;
 274                                 sleep(5);
 275                                 create_listen_socket();
 276                                 if(listen_fd < 0)
 277                                         fatal("Cannot listen for web clients (connected clients %llu).", global_statistics.connected_clients);
 278
 279                                 failures = 0;
 280                         }
 281
 282                         continue;
 283                 }
 284                 else if(likely(retval)) {
 285                         // check for new incoming connections
 286                         if(fd.revents & POLLIN || fd.revents & POLLPRI) {
 287                                 w = web_client_create(listen_fd);
 288                                 if(unlikely(!w)) {
 289                                         // no need for error log - web_client_create already logged the error
 290                                         continue;
 291                                 }
 292
 293                                 if(pthread_create(&w->thread, NULL, web_client_main, w) != 0) {
 294                                         error("%llu: failed to create new thread for web client.");
 295                                         w->obsolete = 1;
 296                                 }
 297                                 else if(pthread_detach(w->thread) != 0) {
 298                                         error("%llu: Cannot request detach of newly created web client thread.", w->id);
 299                                         w->obsolete = 1;
 300                                 }
 301                         }
 302                         else {
 303                                 failures++;
 304                                 debug(D_WEB_CLIENT, "LISTENER: select() didn't do anything.");
 305                                 continue;
 306                         }
 307                 }
 308                 else {
 309                         debug(D_WEB_CLIENT, "LISTENER: select() timeout.");
 310                         counter = CLEANUP_EVERY_EVENTS;
 311                 }
 312
 313                 // cleanup unused clients
 314                 counter++;
 315                 if(counter > CLEANUP_EVERY_EVENTS) {
 316                         counter = 0;
 317                         for (w = web_clients; w;) {
 318                                 if (w->obsolete) {
 319                                         debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);
 320                                         // pthread_cancel(w->thread);
 321                                         // pthread_join(w->thread, NULL);
 322                                         w = web_client_free(w);
 323 #ifdef NETDATA_INTERNAL_CHECKS
 324                                         log_allocations();
 325 #endif
 326                                 }
 327                                 else w = w->next;
 328                         }
 329                 }
 330
 331                 failures = 0;
 332         }
 333
 334         debug(D_WEB_CLIENT, "LISTENER: exit!");
 335         close(listen_fd);
 336         listen_fd = -1;
 337         return NULL;
 338 }
 339
 340 struct web_client *single_threaded_clients[FD_SETSIZE];
 341
 342 static inline int single_threaded_link_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds, int *max) {
 343         if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))
 344                 return 1;
 345
 346         if(unlikely(w->ifd < 0 || w->ifd >= FD_SETSIZE || w->ofd < 0 || w->ofd >= FD_SETSIZE)) {
 347                 error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd < FD_SETSIZE (%d)", w->id, w->ifd, w->ofd, FD_SETSIZE);
 348                 return 1;
 349         }
 350
 351         FD_SET(w->ifd, efds);
 352         if(unlikely(*max < w->ifd)) *max = w->ifd;
 353
 354         if(unlikely(w->ifd != w->ofd)) {
 355                 if(*max < w->ofd) *max = w->ofd;
 356                 FD_SET(w->ofd, efds);
 357         }
 358
 359         if(w->wait_receive) FD_SET(w->ifd, ifds);
 360         if(w->wait_send)    FD_SET(w->ofd, ofds);
 361
 362         single_threaded_clients[w->ifd] = w;
 363         single_threaded_clients[w->ofd] = w;
 364
 365         return 0;
 366 }
 367
 368 static inline int single_threaded_unlink_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds) {
 369         FD_CLR(w->ifd, efds);
 370         if(unlikely(w->ifd != w->ofd)) FD_CLR(w->ofd, efds);
 371
 372         if(w->wait_receive) FD_CLR(w->ifd, ifds);
 373         if(w->wait_send)    FD_CLR(w->ofd, ofds);
 374
 375         single_threaded_clients[w->ifd] = NULL;
 376         single_threaded_clients[w->ofd] = NULL;
 377
 378         if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))
 379                 return 1;
 380
 381         return 0;
 382 }
 383
 384 void *socket_listen_main_single_threaded(void *ptr) {
 385         (void)ptr;
 386
 387         web_server_mode = WEB_SERVER_MODE_SINGLE_THREADED;
 388
 389         info("Single threaded WEB SERVER thread created with task id %d", gettid());
 390
 391         struct web_client *w;
 392         int retval, failures = 0;
 393
 394         if(ptr) { ; }
 395
 396         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 397                 error("Cannot set pthread cancel type to DEFERRED.");
 398
 399         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 400                 error("Cannot set pthread cancel state to ENABLE.");
 401
 402         if(listen_fd < 0 || listen_fd >= FD_SETSIZE)
 403                 fatal("LISTENER: Listen socket %d is not ready, or invalid.", listen_fd);
 404
 405         int i;
 406         for(i = 0; i < FD_SETSIZE ; i++)
 407                 single_threaded_clients[i] = NULL;
 408
 409         fd_set ifds, ofds, efds, rifds, rofds, refds;
 410         FD_ZERO (&ifds);
 411         FD_ZERO (&ofds);
 412         FD_ZERO (&efds);
 413         FD_SET(listen_fd, &ifds);
 414         FD_SET(listen_fd, &efds);
 415         int fdmax = listen_fd;
 416
 417         for(;;) {
 418                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server waiting (listen fd = %d, fdmax = %d)...", listen_fd, fdmax);
 419
 420                 struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
 421                 rifds = ifds;
 422                 rofds = ofds;
 423                 refds = efds;
 424                 retval = select(fdmax+1, &rifds, &rofds, &refds, &tv);
 425
 426                 if(unlikely(retval == -1)) {
 427                         debug(D_WEB_CLIENT, "LISTENER: select() failed.");
 428                         failures++;
 429                         if(failures > 10) {
 430                                 if(global_statistics.connected_clients) {
 431                                         error("REMOVING ALL %lu WEB CLIENTS !", global_statistics.connected_clients);
 432                                         while (web_clients) {
 433                                                 single_threaded_unlink_client(web_clients, &ifds, &ofds, &efds);
 434                                                 web_client_free(web_clients);
 435                                         }
 436                                 }
 437
 438                                 error("LISTENER: our listen port %d seems dead. Re-opening it.", listen_fd);
 439
 440                                 close(listen_fd);
 441                                 listen_fd = -1;
 442                                 sleep(5);
 443
 444                                 create_listen_socket();
 445                                 if(listen_fd < 0 || listen_fd >= FD_SETSIZE)
 446                                         fatal("Cannot listen for web clients (connected clients %llu).", global_statistics.connected_clients);
 447
 448                                 FD_ZERO (&ifds);
 449                                 FD_ZERO (&ofds);
 450                                 FD_ZERO (&efds);
 451                                 FD_SET(listen_fd, &ifds);
 452                                 FD_SET(listen_fd, &efds);
 453                                 failures = 0;
 454                         }
 455                 }
 456                 else if(likely(retval)) {
 457                         failures = 0;
 458                         debug(D_WEB_CLIENT_ACCESS, "LISTENER: got something.");
 459
 460                         if(FD_ISSET(listen_fd, &rifds)) {
 461                                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");
 462                                 w = web_client_create(listen_fd);
 463                                 if(single_threaded_link_client(w, &ifds, &ofds, &ifds, &fdmax) != 0) {
 464                                         web_client_free(w);
 465                                 }
 466                         }
 467
 468                         for(i = 0 ; i <= fdmax ; i++) {
 469                                 if(likely(!FD_ISSET(i, &rifds) && !FD_ISSET(i, &rofds) && !FD_ISSET(i, &refds)))
 470                                         continue;
 471
 472                                 w = single_threaded_clients[i];
 473                                 if(unlikely(!w))
 474                                         continue;
 475
 476                                 if(unlikely(single_threaded_unlink_client(w, &ifds, &ofds, &efds) != 0)) {
 477                                         web_client_free(w);
 478                                         continue;
 479                                 }
 480
 481                                 if (unlikely(FD_ISSET(w->ifd, &refds) || FD_ISSET(w->ofd, &refds))) {
 482                                         web_client_free(w);
 483                                         continue;
 484                                 }
 485
 486                                 if (unlikely(w->wait_receive && FD_ISSET(w->ifd, &rifds))) {
 487                                         if (unlikely(web_client_receive(w) < 0)) {
 488                                                 web_client_free(w);
 489                                                 continue;
 490                                         }
 491
 492                                         if (w->mode != WEB_CLIENT_MODE_FILECOPY) {
 493                                                 debug(D_WEB_CLIENT, "%llu: Processing received data.", w->id);
 494                                                 web_client_process(w);
 495                                         }
 496                                 }
 497
 498                                 if (unlikely(w->wait_send && FD_ISSET(w->ofd, &rofds))) {
 499                                         if (unlikely(web_client_send(w) < 0)) {
 500                                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
 501                                                 web_client_free(w);
 502                                                 continue;
 503                                         }
 504                                 }
 505
 506                                 if(unlikely(single_threaded_link_client(w, &ifds, &ofds, &efds, &fdmax) != 0)) {
 507                                         web_client_free(w);
 508                                 }
 509                         }
 510                 }
 511                 else {
 512                         debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server timeout.");
 513 #ifdef NETDATA_INTERNAL_CHECKS
 514                         log_allocations();
 515 #endif
 516                 }
 517         }
 518
 519         debug(D_WEB_CLIENT, "LISTENER: exit!");
 520         close(listen_fd);
 521         listen_fd = -1;
 522         return NULL;
 523 }