http_send.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file http_send.c paraslash's http sender */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "server.cmdline.h"
  14 #include "afh.h"
  15 #include "server.h"
  16 #include "http.h"
  17 #include "vss.h"
  18 #include "send.h"
  19 #include "list.h"
  20 #include "close_on_fork.h"
  21 #include "error.h"
  22 #include "net.h"
  23 #include "string.h"
  24 #include "fd.h"
  25 #include "chunk_queue.h"
  26
  27 /** \cond convert sock_addr_in to ascii */
  28 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
  29 /* get the port number of a struct http_client */
  30 #define CLIENT_PORT(hc) (hc)->addr.sin_port
  31 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  32 /** \endcond */
  33
  34 /** The possible states of a client from the server's POV. */
  35 enum http_status {
  36         /** We accepted the connection on the tcp socket. */
  37         HTTP_CONNECTED,
  38         /** Successfully received the get request. */
  39         HTTP_GOT_GET_REQUEST,
  40         /** We sent the OK message back to the client. */
  41         HTTP_SENT_OK_MSG,
  42         /** Connection established, we might need to send the audio file header. */
  43         HTTP_READY_TO_STREAM,
  44         /** Connection is ready for sending audio data. */
  45         HTTP_STREAMING,
  46         /** We didn't receive a valid get request. */
  47         HTTP_INVALID_GET_REQUEST
  48 };
  49
  50 /** Clients will be kicked if there are more than that many bytes pending. */
  51 #define MAX_BACKLOG 400000
  52 /** The list of connected clients. */
  53 static struct list_head clients;
  54 /** The whitelist/blacklist. */
  55 static struct list_head access_perm_list;
  56
  57 /** Describes one client that connected the tcp port of the http sender. */
  58 struct http_client {
  59         /** The file descriptor of the client. */
  60         int fd;
  61         /** Address information about the client. */
  62         struct sockaddr_in addr;
  63         /** The client's current status. */
  64         enum http_status status;
  65         /** Non-zero if we included \a fd in the read set.*/
  66         int check_r;
  67         /** Non-zero if we included \a fd in the write set. */
  68         int check_w;
  69         /** The position of this client in the client list. */
  70         struct list_head node;
  71         /** The list of pending chunks for this client. */
  72         struct chunk_queue *cq;
  73 };
  74
  75 /**
  76  * Describes one entry in the blacklist/whitelist of the http sender.
  77  */
  78 struct access_info {
  79         /** The address to be black/whitelisted. */
  80         struct in_addr addr;
  81         /** The netmask for this entry. */
  82         unsigned netmask;
  83         /** The position of this entry in the access_perm_list. */
  84         struct list_head node;
  85 };
  86
  87 static int server_fd = -1, numclients;
  88 static struct sender *self;
  89
  90
  91 static void http_shutdown_client(struct http_client *hc, const char *msg)
  92 {
  93         PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
  94                 hc->fd, msg);
  95         numclients--;
  96         close(hc->fd);
  97         del_close_on_fork_list(hc->fd);
  98         cq_destroy(hc->cq);
  99         list_del(&hc->node);
 100         free(hc);
 101 }
 102
 103 static void http_shutdown_clients(void)
 104 {
 105         struct http_client *hc, *tmp;
 106         list_for_each_entry_safe(hc, tmp, &clients, node)
 107                 http_shutdown_client(hc, "vss request");
 108 }
 109
 110 static int http_send_msg(struct http_client *hc, const char *msg)
 111 {
 112         int ret = send_buffer(hc->fd, msg);
 113
 114         if (ret < 0)
 115                 http_shutdown_client(hc, "send msg failed");
 116         return ret;
 117 }
 118
 119 static void http_send_ok_msg(struct http_client *hc)
 120 {
 121         PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
 122         http_send_msg(hc, HTTP_OK_MSG);
 123 }
 124
 125 static int http_send_err_msg(struct http_client *hc)
 126 {
 127         PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
 128         return http_send_msg(hc, HTTP_ERR_MSG);
 129 }
 130
 131 static int send_queued_chunks(struct http_client *hc)
 132 {
 133         struct queued_chunk *qc;
 134         while ((qc = cq_peek(hc->cq))) {
 135                 char *buf;
 136                 size_t len;
 137                 int ret = write_ok(hc->fd);
 138                 if (ret <= 0)
 139                         return ret? -E_WRITE_OK : 0;
 140                 cq_get(qc, &buf, &len);
 141                 ret = write(hc->fd, buf, len);
 142                 if (ret < 0)
 143                         return -E_SEND_QUEUED_CHUNK;
 144                 cq_update(hc->cq, ret);
 145                 if (ret != len)
 146                         return 1;
 147                 cq_dequeue(hc->cq);
 148         }
 149         return 1;
 150 }
 151
 152 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
 153         size_t sent)
 154 {
 155         int ret = cq_enqueue(hc->cq, chunk_num, sent);
 156         if (ret < 0)
 157                 http_shutdown_client(hc, "queue error");
 158         return ret;
 159 }
 160
 161 static void http_send( long unsigned current_chunk,
 162         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 163 {
 164         struct http_client *hc, *tmp;
 165         int ret;
 166
 167         list_for_each_entry_safe(hc, tmp, &clients, node) {
 168                 if (hc->status != HTTP_STREAMING &&
 169                                 hc->status != HTTP_READY_TO_STREAM)
 170                         continue;
 171                 if (hc->status == HTTP_READY_TO_STREAM) {
 172                         size_t hlen;
 173                         char *hbuf = vss_get_header(&hlen);
 174                         if (hbuf && hlen > 0 && current_chunk) {
 175                                 /* need to send header */
 176                                 PARA_INFO_LOG("queueing header: %zu\n", hlen);
 177                                 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
 178                                         continue;
 179                         } else
 180                                 PARA_INFO_LOG("no need to queue header\n");
 181                         hc->status = HTTP_STREAMING;
 182                 }
 183                 ret = send_queued_chunks(hc);
 184                 if (ret < 0) {
 185                         http_shutdown_client(hc, "queue send error");
 186                         continue;
 187                 }
 188                 if (!len)
 189                         continue;
 190                 if (!ret || write_ok(hc->fd) <= 0) {
 191                         queue_chunk_or_shutdown(hc, current_chunk, 0);
 192                         continue;
 193                 }
 194 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
 195                 ret = write(hc->fd, buf, len);
 196 //              PARA_DEBUG_LOG("ret: %d\n", ret);
 197                 if (ret < 0) {
 198                         http_shutdown_client(hc, "send error");
 199                         continue;
 200                 }
 201                 if (ret != len)
 202                         queue_chunk_or_shutdown(hc, current_chunk, ret);
 203         }
 204 }
 205
 206 static int host_in_access_perm_list(struct http_client *hc)
 207 {
 208         struct access_info *ai, *tmp;
 209         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 210                 unsigned mask = ((~0U) >> ai->netmask);
 211                 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
 212                         return 1;
 213         }
 214         return 0;
 215 }
 216
 217 static void http_post_select(fd_set *rfds, fd_set *wfds)
 218 {
 219         int i = -1, match;
 220         struct http_client *hc, *tmp;
 221         const char *err_msg;
 222
 223         list_for_each_entry_safe(hc, tmp, &clients, node) {
 224                 i++;
 225 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
 226                 switch (hc->status) {
 227                 case HTTP_STREAMING: /* nothing to do */
 228                 case HTTP_READY_TO_STREAM:
 229                         break;
 230                 case HTTP_CONNECTED: /* need to recv get request */
 231                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 232                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 233                                                 < 0) {
 234                                         hc->status = HTTP_INVALID_GET_REQUEST;
 235                                 } else {
 236                                         hc->status = HTTP_GOT_GET_REQUEST;
 237                                         PARA_INFO_LOG("%s",
 238                                                 "received get request\n");
 239                                 }
 240                         }
 241                         break;
 242                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 243                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 244                                 hc->status = HTTP_SENT_OK_MSG;
 245                                 http_send_ok_msg(hc);
 246                         }
 247                         break;
 248                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 249                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 250                                 if (http_send_err_msg(hc) >= 0)
 251                                         http_shutdown_client(hc,
 252                                                 "invalid get request");
 253                         }
 254                         break;
 255                 case HTTP_SENT_OK_MSG: /* need to send header? */
 256                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 257                                 hc->status = HTTP_READY_TO_STREAM;
 258                         break;
 259                 }
 260         }
 261         if (!FD_ISSET(server_fd, rfds))
 262                 return;
 263         hc = para_calloc(sizeof(struct http_client));
 264         err_msg = "accept error";
 265         hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
 266         if (hc->fd <= 0)
 267                 goto err_out;
 268         PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
 269         if (conf.http_max_clients_arg > 0 && numclients >=
 270                         conf.http_max_clients_arg) {
 271                 err_msg = "server full";
 272                 goto err_out;
 273         }
 274         match = host_in_access_perm_list(hc);
 275         PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
 276         if ((match && !conf.http_default_deny_given) ||
 277                         (!match && conf.http_default_deny_given)) {
 278                 err_msg = "permission denied";
 279                 goto err_out;
 280         }
 281         hc->status = HTTP_CONNECTED;
 282         hc->cq = cq_new(MAX_BACKLOG);
 283         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 284                 CLIENT_ADDR(hc), hc->fd);
 285         numclients++;
 286         para_list_add(&hc->node, &clients);
 287         add_close_on_fork_list(hc->fd);
 288         mark_fd_nonblock(hc->fd);
 289         return;
 290 err_out:
 291         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 292                 CLIENT_ADDR(hc), err_msg);
 293         if (hc->fd > 0)
 294                 close(hc->fd);
 295         free(hc);
 296 }
 297
 298 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 299 {
 300         struct http_client *hc, *tmp;
 301
 302         if (server_fd < 0)
 303                 return;
 304         para_fd_set(server_fd, rfds, max_fileno);
 305         list_for_each_entry_safe(hc, tmp, &clients, node) {
 306                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 307                 hc->check_r = 0;
 308                 hc->check_w = 0;
 309                 switch (hc->status) {
 310                 case HTTP_STREAMING:
 311                 case HTTP_READY_TO_STREAM:
 312                         break;
 313                 case HTTP_CONNECTED: /* need to recv get request */
 314                         para_fd_set(hc->fd, rfds, max_fileno);
 315                         hc->check_r = 1;
 316                         break;
 317                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 318                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 319                         para_fd_set(hc->fd, wfds, max_fileno);
 320                         hc->check_w = 1;
 321                         break;
 322                 case HTTP_SENT_OK_MSG:
 323                         if (!vss_playing())
 324                                 break; /* wait until server starts playing */
 325                         para_fd_set(hc->fd, wfds, max_fileno);
 326                         hc->check_w = 1;
 327                         break;
 328                 }
 329         }
 330 }
 331
 332 static int open_tcp_port(int port)
 333 {
 334         int ret;
 335
 336         server_fd = init_tcp_socket(port);
 337         if (server_fd < 0) {
 338                 http_shutdown_clients();
 339                 self->status = SENDER_OFF;
 340                 return server_fd;
 341         }
 342         ret = mark_fd_nonblock(server_fd);
 343         if (ret < 0) {
 344                 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
 345                 exit(EXIT_FAILURE);
 346         }
 347         self->status = SENDER_ON;
 348         add_close_on_fork_list(server_fd);
 349         return 1;
 350 }
 351
 352 static int http_com_on(__a_unused struct sender_command_data *scd)
 353 {
 354         if (self->status == SENDER_ON)
 355                 return 1;
 356         return open_tcp_port(conf.http_port_arg);
 357 }
 358
 359 static int http_com_off(__a_unused struct sender_command_data *scd)
 360 {
 361         self->status = SENDER_OFF;
 362         if (server_fd > 0) {
 363                 close(server_fd);
 364                 del_close_on_fork_list(server_fd);
 365                 server_fd = -1;
 366         }
 367         http_shutdown_clients();
 368         return 1;
 369 }
 370
 371 static void del_perm_list_entry(struct sender_command_data *scd)
 372 {
 373         struct access_info *ai, *tmp;
 374
 375         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 376                 char *nad = para_strdup(inet_ntoa(ai->addr));
 377                 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
 378                                 ai->netmask == scd->netmask) {
 379                         PARA_NOTICE_LOG("removing %s/%i from access list\n",
 380                                 nad, ai->netmask);
 381                         list_del(&ai->node);
 382                         free(ai);
 383                 }
 384                 free(nad);
 385         }
 386 }
 387
 388 static void add_perm_list_entry(struct sender_command_data *scd)
 389 {
 390         struct access_info *ai = para_malloc(sizeof(struct access_info));
 391         ai->addr = scd->addr;
 392         ai->netmask = scd->netmask;
 393         PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
 394                 ai->netmask);
 395         para_list_add(&ai->node, &access_perm_list);
 396 }
 397
 398 static int http_com_deny(struct sender_command_data *scd)
 399 {
 400         if (conf.http_default_deny_given)
 401                 del_perm_list_entry(scd);
 402         else
 403                 add_perm_list_entry(scd);
 404         return 1;
 405 }
 406
 407 static int http_com_allow(struct sender_command_data *scd)
 408 {
 409         if (conf.http_default_deny_given)
 410                 add_perm_list_entry(scd);
 411         else
 412                 del_perm_list_entry(scd);
 413         return 1;
 414 }
 415
 416 static char *http_info(void)
 417 {
 418         char *clnts = NULL, *ap = NULL, *ret;
 419         struct access_info *ai, *tmp_ai;
 420         struct http_client *hc, *tmp_hc;
 421
 422         list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
 423                 char *tmp = make_message("%s%s/%d ", ap? ap : "",
 424                         inet_ntoa(ai->addr), ai->netmask);
 425                 free(ap);
 426                 ap = tmp;
 427         }
 428         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 429                 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
 430                         CLIENT_ADDR(hc), CLIENT_PORT(hc));
 431                 free(clnts);
 432                 clnts = tmp;
 433         }
 434         ret = make_message(
 435                 "http status: %s\n"
 436                 "http tcp port: %d\n"
 437                 "http clients: %d\n"
 438                 "http maximal number of clients: %d%s\n"
 439                 "http connected clients: %s\n"
 440                 "http access %s list: %s\n",
 441                 (self->status == SENDER_ON)? "on" : "off",
 442                 conf.http_port_arg,
 443                 numclients,
 444                 conf.http_max_clients_arg,
 445                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 446                 clnts? clnts : "(none)",
 447                 conf.http_default_deny_given? "allow" : "deny",
 448                 ap? ap : "(none)"
 449         );
 450         free(ap);
 451         free(clnts);
 452         return ret;
 453 }
 454
 455 static void init_access_control_list(void)
 456 {
 457         int i;
 458         struct sender_command_data scd;
 459
 460         INIT_LIST_HEAD(&access_perm_list);
 461         for (i = 0; i < conf.http_access_given; i++) {
 462                 char *arg = para_strdup(conf.http_access_arg[i]);
 463                 char *p = strchr(arg, '/');
 464                 if (!p)
 465                         goto err;
 466                 *p = '\0';
 467                 if (!inet_aton(arg, &scd.addr))
 468                         goto err;
 469                 scd.netmask = atoi(++p);
 470                 if (scd.netmask < 0 || scd.netmask > 32)
 471                         goto err;
 472                 add_perm_list_entry(&scd);
 473                 goto success;
 474 err:
 475                 PARA_CRIT_LOG("syntax error for http_access option "
 476                         "#%d, ignoring\n", i);
 477 success:
 478                 free(arg);
 479                 continue;
 480         }
 481 }
 482
 483 static char *http_help(void)
 484 {
 485         return make_message(
 486                 "usage: {on|off}\n"
 487                 "usage: {allow|deny} IP mask\n"
 488                 "example: allow 127.0.0.1 32\n"
 489         );
 490 }
 491
 492 /**
 493  * The init function of the http sender.
 494  *
 495  * \param s Pointer to the http sender struct.
 496  *
 497  * It initializes all function pointers of \a s, the client list and the access
 498  * control list. If the autostart option was given, the tcp port is opened.
 499  */
 500 void http_send_init(struct sender *s)
 501 {
 502         INIT_LIST_HEAD(&clients);
 503         s->info = http_info;
 504         s->send = http_send;
 505         s->pre_select = http_pre_select;
 506         s->post_select = http_post_select;
 507         s->shutdown_clients = http_shutdown_clients;
 508         s->help = http_help;
 509         s->client_cmds[SENDER_ON] = http_com_on;
 510         s->client_cmds[SENDER_OFF] = http_com_off;
 511         s->client_cmds[SENDER_DENY] = http_com_deny;
 512         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 513         s->client_cmds[SENDER_ADD] = NULL;
 514         s->client_cmds[SENDER_DELETE] = NULL;
 515         self = s;
 516         init_access_control_list();
 517         if (!conf.http_no_autostart_given)
 518                 open_tcp_port(conf.http_port_arg); /* ignore errors */
 519         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 520 }