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