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
  17 #include "common.h"
  18 #include "log.h"
  19 #include "appconfig.h"
  20 #include "url.h"
  21 #include "web_buffer.h"
  22 #include "web_client.h"
  23 #include "web_server.h"
  24 #include "global_statistics.h"
  25 #include "rrd.h"
  26 #include "rrd2json.h"
  27 #include "../config.h"
  28
  29 int listen_backlog = LISTEN_BACKLOG;
  30
  31 int listen_fd = -1;
  32 int listen_port = LISTEN_PORT;
  33
  34 #ifdef NETDATA_INTERNAL_CHECKS
  35 static void log_allocations(void)
  36 {
  37         static int mem = 0;
  38
  39         struct mallinfo mi;
  40
  41         mi = mallinfo();
  42         if(mi.uordblks > mem) {
  43                 int clients = 0;
  44                 struct web_client *w;
  45                 for(w = web_clients; w ; w = w->next) clients++;
  46
  47                 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);
  48                 mem = mi.uordblks;
  49         }
  50 }
  51 #endif
  52
  53 static int is_ip_anything(const char *ip)
  54 {
  55         if(!ip || !*ip
  56                         || !strcmp(ip, "any")
  57                         || !strcmp(ip, "all")
  58                         || !strcmp(ip, "*")
  59                         || !strcmp(ip, "::")
  60                         || !strcmp(ip, "0.0.0.0")
  61                         ) return 1;
  62
  63         return 0;
  64 }
  65
  66 int create_listen_socket4(const char *ip, int port, int listen_backlog)
  67 {
  68         int sock;
  69         int sockopt = 1;
  70
  71         debug(D_LISTENER, "IPv4 creating new listening socket on port %d", port);
  72
  73         sock = socket(AF_INET, SOCK_STREAM, 0);
  74         if(sock < 0) {
  75                 error("IPv4 socket() failed.");
  76                 return -1;
  77         }
  78
  79         /* avoid "address already in use" */
  80         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));
  81
  82         struct sockaddr_in name;
  83         memset(&name, 0, sizeof(struct sockaddr_in));
  84         name.sin_family = AF_INET;
  85         name.sin_port = htons (port);
  86
  87         if(is_ip_anything(ip)) {
  88                 name.sin_addr.s_addr = htonl(INADDR_ANY);
  89                 // info("Listening on any IPs (IPv4).");
  90         }
  91         else {
  92                 int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);
  93                 if(ret != 1) {
  94                         error("Failed to convert IP '%s' to a valid IPv4 address.", ip);
  95                         close(sock);
  96                         return -1;
  97                 }
  98                 // info("Listening on IP '%s' (IPv4).", ip);
  99         }
 100
 101         if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
 102                 close(sock);
 103                 error("IPv4 bind() failed.");
 104                 return -1;
 105         }
 106
 107         if(listen(sock, listen_backlog) < 0) {
 108                 close(sock);
 109                 fatal("IPv4 listen() failed.");
 110                 return -1;
 111         }
 112
 113         debug(D_LISTENER, "IPv4 listening port %d created", port);
 114         return sock;
 115 }
 116
 117 int create_listen_socket6(const char *ip, int port, int listen_backlog)
 118 {
 119         int sock = -1;
 120         int sockopt = 1;
 121
 122         debug(D_LISTENER, "IPv6 creating new listening socket on port %d", port);
 123
 124         sock = socket(AF_INET6, SOCK_STREAM, 0);
 125         if (sock < 0) {
 126                 error("IPv6 socket() failed. Disabling IPv6.");
 127                 return -1;
 128         }
 129
 130         /* avoid "address already in use" */
 131         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));
 132
 133         struct sockaddr_in6 name;
 134         memset(&name, 0, sizeof(struct sockaddr_in6));
 135         name.sin6_family = AF_INET6;
 136         name.sin6_port = htons ((uint16_t) port);
 137
 138         if(is_ip_anything(ip)) {
 139                 name.sin6_addr = in6addr_any;
 140                 // info("Listening on all IPs (IPv6 and IPv4)");
 141         }
 142         else {
 143                 int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);
 144                 if(ret != 1) {
 145                         error("Failed to convert IP '%s' to a valid IPv6 address. Disabling IPv6.", ip);
 146                         close(sock);
 147                         return -1;
 148                 }
 149                 // info("Listening on IP '%s' (IPv6)", ip);
 150         }
 151
 152         name.sin6_scope_id = 0;
 153
 154         if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
 155                 close(sock);
 156                 error("IPv6 bind() failed. Disabling IPv6.");
 157                 return -1;
 158         }
 159
 160         if (listen(sock, listen_backlog) < 0) {
 161                 close(sock);
 162                 error("IPv6 listen() failed. Disabling IPv6.");
 163                 return -1;
 164         }
 165
 166         debug(D_LISTENER, "IPv6 listening port %d created", port);
 167         return sock;
 168 }
 169
 170
 171 int create_listen_socket(void) {
 172         listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 173
 174         listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 175         if(listen_port < 1 || listen_port > 65535) {
 176                 error("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 177                 listen_port = LISTEN_PORT;
 178         }
 179         else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 180
 181         int ip = 0;
 182         char *ipv = config_get("global", "ip version", "any");
 183         if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 184         else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 185         else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 186         else error("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 187
 188         if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 189         if(listen_fd < 0) {
 190                 listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 191                 // if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 192         }
 193
 194         return listen_fd;
 195 }
 196
 197 // --------------------------------------------------------------------------------------
 198 // the main socket listener
 199
 200 // 1. it accepts new incoming requests on our port
 201 // 2. creates a new web_client for each connection received
 202 // 3. spawns a new pthread to serve the client (this is optimal for keep-alive clients)
 203 // 4. cleans up old web_clients that their pthreads have been exited
 204
 205 void *socket_listen_main_multi_threaded(void *ptr) {
 206         if(ptr) { ; }
 207
 208         info("Multi-threaded WEB SERVER thread created with task id %d", gettid());
 209
 210         struct web_client *w;
 211         struct timeval tv;
 212         int retval, failures = 0;
 213
 214         if(ptr) { ; }
 215
 216         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 217                 error("Cannot set pthread cancel type to DEFERRED.");
 218
 219         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 220                 error("Cannot set pthread cancel state to ENABLE.");
 221
 222         web_client_timeout = (int) config_get_number("global", "disconnect idle web clients after seconds", DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS);
 223         web_enable_gzip = config_get_boolean("global", "enable web responses gzip compression", web_enable_gzip);
 224
 225         if(listen_fd < 0) fatal("LISTENER: Listen socket is not ready.");
 226
 227         fd_set ifds;
 228         FD_ZERO (&ifds);
 229
 230         for(;;) {
 231                 tv.tv_sec = 0;
 232                 tv.tv_usec = 200000;
 233
 234                 if(likely(listen_fd >= 0))
 235                         FD_SET(listen_fd, &ifds);
 236
 237                 // debug(D_WEB_CLIENT, "LISTENER: Waiting...");
 238                 retval = select(listen_fd + 1, &ifds, NULL, NULL, &tv);
 239
 240                 if(unlikely(retval == -1)) {
 241                         error("LISTENER: select() failed.");
 242                         failures++;
 243
 244                         if(failures > 10) {
 245                                 error("LISTENER: our listen port %d seems dead. Re-opening it.", listen_fd);
 246                                 close(listen_fd);
 247                                 listen_fd = -1;
 248                                 sleep(5);
 249                                 create_listen_socket();
 250                                 if(listen_fd < 0)
 251                                         fatal("Cannot listen for web clients (connected clients %llu).", global_statistics.connected_clients);
 252
 253                                 failures = 0;
 254                         }
 255
 256                         continue;
 257                 }
 258                 else if(likely(retval)) {
 259                         // check for new incoming connections
 260                         if(likely(FD_ISSET(listen_fd, &ifds))) {
 261                                 w = web_client_create(listen_fd);
 262                                 if(unlikely(!w)) {
 263                                         // no need for error log - web_client_create already logged the error
 264                                         continue;
 265                                 }
 266
 267                                 if(pthread_create(&w->thread, NULL, web_client_main, w) != 0) {
 268                                         error("%llu: failed to create new thread for web client.");
 269                                         w->obsolete = 1;
 270                                 }
 271                                 else if(pthread_detach(w->thread) != 0) {
 272                                         error("%llu: Cannot request detach of newly created web client thread.", w->id);
 273                                         w->obsolete = 1;
 274                                 }
 275                         }
 276                         else debug(D_WEB_CLIENT, "LISTENER: select() didn't do anything.");
 277
 278                 }
 279                 //else {
 280                 //      debug(D_WEB_CLIENT, "LISTENER: select() timeout.");
 281                 //}
 282
 283                 failures = 0;
 284
 285                 // cleanup unused clients
 286                 for (w = web_clients; w; ) {
 287                         if (w->obsolete) {
 288                                 debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);
 289                                 // pthread_cancel(w->thread);
 290                                 // pthread_join(w->thread, NULL);
 291                                 w = web_client_free(w);
 292 #ifdef NETDATA_INTERNAL_CHECKS
 293                                 log_allocations();
 294 #endif
 295                         }
 296                         else w = w->next;
 297                 }
 298         }
 299
 300         error("LISTENER: exit!");
 301
 302         if(listen_fd >= 0) close(listen_fd);
 303         exit(2);
 304
 305         return NULL;
 306 }
 307
 308 void *socket_listen_main_single_threaded(void *ptr) {
 309         if(ptr) { ; }
 310
 311         info("Single threaded WEB SERVER thread created with task id %d", gettid());
 312
 313         struct web_client *w;
 314         int retval, failures = 0;
 315
 316         if(ptr) { ; }
 317
 318         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 319                 error("Cannot set pthread cancel type to DEFERRED.");
 320
 321         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 322                 error("Cannot set pthread cancel state to ENABLE.");
 323
 324         web_client_timeout = (int) config_get_number("global", "disconnect idle web clients after seconds", DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS);
 325         web_enable_gzip = config_get_boolean("global", "enable web responses gzip compression", web_enable_gzip);
 326
 327         if(listen_fd < 0) fatal("LISTENER: Listen socket is not ready.");
 328
 329         fd_set ifds, ofds, efds;
 330         int fdmax = listen_fd;
 331
 332         for(;;) {
 333                 int has_obsolete = 0;
 334                 FD_ZERO (&ifds);
 335                 FD_ZERO (&ofds);
 336                 FD_ZERO (&efds);
 337
 338                 if(listen_fd >= 0) {
 339                         // debug(D_WEB_CLIENT_ACCESS, "LISTENER: adding listen socket %d to ifds, efds", listen_fd);
 340                         FD_SET(listen_fd, &ifds);
 341                         FD_SET(listen_fd, &efds);
 342                 }
 343
 344                 for(w = web_clients; w ; w = w->next) {
 345                         if(unlikely(w->dead)) {
 346                                 error("%llu: client is dead.");
 347                                 w->obsolete = 1;
 348                         }
 349                         else if(unlikely(!w->wait_receive && !w->wait_send)) {
 350                                 error("%llu: client is not set for neither receiving nor sending data.");
 351                                 w->obsolete = 1;
 352                         }
 353
 354                         if(unlikely(w->obsolete)) {
 355                                 has_obsolete++;
 356                                 continue;
 357                         }
 358
 359                         // debug(D_WEB_CLIENT_ACCESS, "%llu: adding input socket %d to efds", w->id, w->ifd);
 360                         FD_SET(w->ifd, &efds);
 361                         if(w->ifd > fdmax) fdmax = w->ifd;
 362
 363                         if(w->ifd != w->ofd) {
 364                                 // debug(D_WEB_CLIENT_ACCESS, "%llu: adding output socket %d to efds", w->id, w->ofd);
 365                                 FD_SET(w->ofd, &efds);
 366                                 if(w->ofd > fdmax) fdmax = w->ofd;
 367                         }
 368
 369                         if (w->wait_receive) {
 370                                 // debug(D_WEB_CLIENT_ACCESS, "%llu: adding input socket %d to ifds", w->id, w->ifd);
 371                                 FD_SET(w->ifd, &ifds);
 372                                 if(w->ifd > fdmax) fdmax = w->ifd;
 373                         }
 374
 375                         if (w->wait_send) {
 376                                 // debug(D_WEB_CLIENT_ACCESS, "%llu: adding output socket %d to ofds", w->id, w->ofd);
 377                                 FD_SET(w->ofd, &ofds);
 378                                 if(w->ofd > fdmax) fdmax = w->ofd;
 379                         }
 380                 }
 381
 382                 // cleanup unused clients
 383                 if(unlikely(has_obsolete)) {
 384                         for (w = web_clients; w; ) {
 385                                 if (w->obsolete) {
 386                                         debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);
 387                                         w = web_client_free(w);
 388 #ifdef NETDATA_INTERNAL_CHECKS
 389                                         log_allocations();
 390 #endif
 391                                 }
 392                                 else w = w->next;
 393                         }
 394                 }
 395
 396                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: Waiting...");
 397                 struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
 398                 errno = 0;
 399                 retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);
 400
 401                 if(retval == -1) {
 402                         error("LISTENER: select() failed.");
 403
 404                         if(errno != EAGAIN) {
 405                                 // debug(D_WEB_CLIENT_ACCESS, "LISTENER: select() failed.");
 406                                 error("REMOVING ALL %lu WEB CLIENTS !", global_statistics.connected_clients);
 407                                 while (web_clients) web_client_free(web_clients);
 408                         }
 409
 410                         failures++;
 411                         if(failures > 10) {
 412                                 error("LISTENER: our listen port %d seems dead. Re-opening it.", listen_fd);
 413                                 close(listen_fd);
 414                                 listen_fd = -1;
 415                                 sleep(5);
 416                                 create_listen_socket();
 417                                 if(listen_fd < 0)
 418                                         fatal("Cannot listen for web clients (connected clients %llu).", global_statistics.connected_clients);
 419
 420                                 failures = 0;
 421                         }
 422
 423                         continue;
 424                 }
 425                 else if(retval) {
 426                         for(w = web_clients; w ; w = w->next) {
 427                                 if (unlikely(w->obsolete)) continue;
 428
 429                                 if (unlikely(FD_ISSET(w->ifd, &efds))) {
 430                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on input socket.", w->id);
 431                                         web_client_reset(w);
 432                                         w->obsolete = 1;
 433                                         continue;
 434                                 }
 435
 436                                 if (unlikely(FD_ISSET(w->ofd, &efds))) {
 437                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on output socket.", w->id);
 438                                         web_client_reset(w);
 439                                         w->obsolete = 1;
 440                                         continue;
 441                                 }
 442
 443                                 if (unlikely(w->wait_receive && FD_ISSET(w->ifd, &ifds))) {
 444                                         long bytes;
 445                                         if (unlikely((bytes = web_client_receive(w)) < 0)) {
 446                                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
 447                                                 errno = 0;
 448                                                 web_client_reset(w);
 449                                                 w->obsolete = 1;
 450                                                 continue;
 451                                         }
 452
 453                                         if (w->mode == WEB_CLIENT_MODE_NORMAL) {
 454                                                 debug(D_WEB_CLIENT, "%llu: Processing received data (%ld bytes).", w->id, bytes);
 455                                                 // info("%llu: Attempting to process received data (%ld bytes).", w->id, bytes);
 456                                                 web_client_process(w);
 457                                         }
 458                                         else {
 459                                                 debug(D_WEB_CLIENT, "%llu: NO Processing for received data (%ld bytes).", w->id, bytes);
 460                                         }
 461                                 }
 462
 463                                 if (unlikely(w->wait_send && FD_ISSET(w->ofd, &ofds))) {
 464                                         ssize_t bytes;
 465                                         if (unlikely((bytes = web_client_send(w)) < 0)) {
 466                                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
 467                                                 errno = 0;
 468                                                 web_client_reset(w);
 469                                                 w->obsolete = 1;
 470                                                 continue;
 471                                         }
 472                                 }
 473                         }
 474
 475                         // check for new incoming connections
 476                         if(FD_ISSET(listen_fd, &ifds)) {
 477                                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");
 478                                 web_client_create(listen_fd);
 479                         }
 480                 }
 481                 else {
 482                         debug(D_WEB_CLIENT_ACCESS, "LISTENER: timeout.");
 483                 }
 484
 485                 failures = 0;
 486         }
 487
 488         error("LISTENER: exit!");
 489
 490         if(listen_fd >= 0) close(listen_fd);
 491         exit(2);
 492
 493         return NULL;
 494 }