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 int listen_fd = -1;
  31 int listen_port = LISTEN_PORT;
  32 int web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
  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 #define CLEANUP_EVERY_EVENTS 1000
 206
 207 void *socket_listen_main_multi_threaded(void *ptr) {
 208         if(ptr) { ; }
 209
 210         web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
 211         info("Multi-threaded WEB SERVER thread created with task id %d", gettid());
 212
 213         struct web_client *w;
 214         struct timeval tv;
 215         int retval, failures = 0, counter = 0;
 216
 217         if(ptr) { ; }
 218
 219         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 220                 error("Cannot set pthread cancel type to DEFERRED.");
 221
 222         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 223                 error("Cannot set pthread cancel state to ENABLE.");
 224
 225         if(listen_fd < 0 || listen_fd >= FD_SETSIZE) fatal("LISTENER: Listen socket %d is not ready, or invalid.", listen_fd);
 226
 227         fd_set ifds;
 228         FD_ZERO (&ifds);
 229
 230         for(;;) {
 231                 tv.tv_sec = 0;
 232                 tv.tv_usec = 100000;
 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                         counter = CLEANUP_EVERY_EVENTS;
 282                 }
 283
 284                 // cleanup unused clients
 285                 counter++;
 286                 if(counter > CLEANUP_EVERY_EVENTS) {
 287                         counter = 0;
 288                         for (w = web_clients; w;) {
 289                                 if (w->obsolete) {
 290                                         debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);
 291                                         // pthread_cancel(w->thread);
 292                                         // pthread_join(w->thread, NULL);
 293                                         w = web_client_free(w);
 294 #ifdef NETDATA_INTERNAL_CHECKS
 295                                         log_allocations();
 296 #endif
 297                                 }
 298                                 else w = w->next;
 299                         }
 300                 }
 301
 302                 failures = 0;
 303         }
 304
 305         error("LISTENER: exit!");
 306         close(listen_fd);
 307         listen_fd = -1;
 308         return NULL;
 309 }
 310
 311 struct web_client *single_threaded_clients[FD_SETSIZE];
 312
 313 static inline int single_threaded_link_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds, int *max) {
 314         if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))
 315                 return 1;
 316
 317         if(unlikely(w->ifd < 0 || w->ifd >= FD_SETSIZE || w->ofd < 0 || w->ofd >= FD_SETSIZE)) {
 318                 error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd < FD_SETSIZE (%d)", w->id, w->ifd, w->ofd, FD_SETSIZE);
 319                 return 1;
 320         }
 321
 322         FD_SET(w->ifd, efds);
 323         if(unlikely(*max < w->ifd)) *max = w->ifd;
 324
 325         if(unlikely(w->ifd != w->ofd)) {
 326                 if(*max < w->ofd) *max = w->ofd;
 327                 FD_SET(w->ofd, efds);
 328         }
 329
 330         if(w->wait_receive) FD_SET(w->ifd, ifds);
 331         if(w->wait_send)    FD_SET(w->ofd, ofds);
 332
 333         single_threaded_clients[w->ifd] = w;
 334         single_threaded_clients[w->ofd] = w;
 335
 336         return 0;
 337 }
 338
 339 static inline int single_threaded_unlink_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds) {
 340         FD_CLR(w->ifd, efds);
 341         if(unlikely(w->ifd != w->ofd)) FD_CLR(w->ofd, efds);
 342
 343         if(w->wait_receive) FD_CLR(w->ifd, ifds);
 344         if(w->wait_send)    FD_CLR(w->ofd, ofds);
 345
 346         single_threaded_clients[w->ifd] = NULL;
 347         single_threaded_clients[w->ofd] = NULL;
 348
 349         if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))
 350                 return 1;
 351
 352         return 0;
 353 }
 354
 355 void *socket_listen_main_single_threaded(void *ptr) {
 356         (void)ptr;
 357
 358         web_server_mode = WEB_SERVER_MODE_SINGLE_THREADED;
 359
 360         info("Single threaded WEB SERVER thread created with task id %d", gettid());
 361
 362         struct web_client *w;
 363         int retval, failures = 0;
 364
 365         if(ptr) { ; }
 366
 367         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 368                 error("Cannot set pthread cancel type to DEFERRED.");
 369
 370         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 371                 error("Cannot set pthread cancel state to ENABLE.");
 372
 373         if(listen_fd < 0 || listen_fd >= FD_SETSIZE)
 374                 fatal("LISTENER: Listen socket %d is not ready, or invalid.", listen_fd);
 375
 376         int i;
 377         for(i = 0; i < FD_SETSIZE ; i++)
 378                 single_threaded_clients[i] = NULL;
 379
 380         fd_set ifds, ofds, efds, rifds, rofds, refds;
 381         FD_ZERO (&ifds);
 382         FD_ZERO (&ofds);
 383         FD_ZERO (&efds);
 384         FD_SET(listen_fd, &ifds);
 385         FD_SET(listen_fd, &efds);
 386         int fdmax = listen_fd;
 387
 388         for(;;) {
 389                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server waiting (listen fd = %d, fdmax = %d)...", listen_fd, fdmax);
 390
 391                 struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
 392                 rifds = ifds;
 393                 rofds = ofds;
 394                 refds = efds;
 395                 retval = select(fdmax+1, &rifds, &rofds, &refds, &tv);
 396
 397                 if(unlikely(retval == -1)) {
 398                         error("LISTENER: select() failed.");
 399                         failures++;
 400                         if(failures > 10) {
 401                                 if(global_statistics.connected_clients) {
 402                                         error("REMOVING ALL %lu WEB CLIENTS !", global_statistics.connected_clients);
 403                                         while (web_clients) {
 404                                                 single_threaded_unlink_client(web_clients, &ifds, &ofds, &efds);
 405                                                 web_client_free(web_clients);
 406                                         }
 407                                 }
 408
 409                                 error("LISTENER: our listen port %d seems dead. Re-opening it.", listen_fd);
 410
 411                                 close(listen_fd);
 412                                 listen_fd = -1;
 413                                 sleep(5);
 414
 415                                 create_listen_socket();
 416                                 if(listen_fd < 0 || listen_fd >= FD_SETSIZE)
 417                                         fatal("Cannot listen for web clients (connected clients %llu).", global_statistics.connected_clients);
 418
 419                                 FD_ZERO (&ifds);
 420                                 FD_ZERO (&ofds);
 421                                 FD_ZERO (&efds);
 422                                 FD_SET(listen_fd, &ifds);
 423                                 FD_SET(listen_fd, &efds);
 424                                 failures = 0;
 425                         }
 426                 }
 427                 else if(likely(retval)) {
 428                         failures = 0;
 429                         debug(D_WEB_CLIENT_ACCESS, "LISTENER: got something.");
 430
 431                         if(FD_ISSET(listen_fd, &rifds)) {
 432                                 debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");
 433                                 w = web_client_create(listen_fd);
 434                                 if(single_threaded_link_client(w, &ifds, &ofds, &ifds, &fdmax) != 0) {
 435                                         web_client_free(w);
 436                                 }
 437                         }
 438
 439                         for(i = 0 ; i <= fdmax ; i++) {
 440                                 if(likely(!FD_ISSET(i, &rifds) && !FD_ISSET(i, &rofds) && !FD_ISSET(i, &refds)))
 441                                         continue;
 442
 443                                 w = single_threaded_clients[i];
 444                                 if(unlikely(!w))
 445                                         continue;
 446
 447                                 if(unlikely(single_threaded_unlink_client(w, &ifds, &ofds, &efds) != 0)) {
 448                                         web_client_free(w);
 449                                         continue;
 450                                 }
 451
 452                                 if (unlikely(FD_ISSET(w->ifd, &refds) || FD_ISSET(w->ofd, &refds))) {
 453                                         web_client_free(w);
 454                                         continue;
 455                                 }
 456
 457                                 if (unlikely(w->wait_receive && FD_ISSET(w->ifd, &rifds))) {
 458                                         if (unlikely(web_client_receive(w) < 0)) {
 459                                                 web_client_free(w);
 460                                                 continue;
 461                                         }
 462
 463                                         if (w->mode != WEB_CLIENT_MODE_FILECOPY) {
 464                                                 debug(D_WEB_CLIENT, "%llu: Processing received data.", w->id);
 465                                                 web_client_process(w);
 466                                         }
 467                                 }
 468
 469                                 if (unlikely(w->wait_send && FD_ISSET(w->ofd, &rofds))) {
 470                                         if (unlikely(web_client_send(w) < 0)) {
 471                                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
 472                                                 web_client_free(w);
 473                                                 continue;
 474                                         }
 475                                 }
 476
 477                                 if(unlikely(single_threaded_link_client(w, &ifds, &ofds, &efds, &fdmax) != 0)) {
 478                                         web_client_free(w);
 479                                 }
 480                         }
 481                 }
 482                 else {
 483                         debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server timeout.");
 484 #ifdef NETDATA_INTERNAL_CHECKS
 485                         log_allocations();
 486 #endif
 487                 }
 488         }
 489
 490         error("LISTENER: exit!");
 491         close(listen_fd);
 492         listen_fd = -1;
 493         return NULL;
 494 }