http_send.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file http_send.c paraslash's http sender */
  20
  21
  22 #include "server.cmdline.h"
  23 #include "server.h"
  24 #include "http.h"
  25 #include "afs.h"
  26 #include "send.h"
  27 #include "list.h"
  28 #include "close_on_fork.h"
  29 #include "error.h"
  30 #include "net.h"
  31 #include "string.h"
  32
  33 /** \cond convert sock_addr_in to ascii */
  34 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
  35 /* get the port number of a struct http_client */
  36 #define CLIENT_PORT(hc) (hc)->addr.sin_port
  37 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  38 /** \endcond */
  39
  40 extern struct gengetopt_args_info conf;
  41
  42 /** the possible states of a client from the server's POV */
  43 enum http_status {
  44         HTTP_CONNECTED,
  45         HTTP_GOT_GET_REQUEST,
  46         HTTP_SENT_OK_MSG,
  47         HTTP_READY_TO_STREAM,
  48         HTTP_STREAMING,
  49         HTTP_INVALID_GET_REQUEST
  50 };
  51
  52 /** clients will be kicked if there are more than that many bytes pending */
  53 #define MAX_BACKLOG 40000
  54 /** the list of connected clients **/
  55 static struct list_head clients;
  56 /** the whitelist/blacklist */
  57 static struct list_head access_perm_list;
  58
  59 /** describes one client that connected the tcp port of the http sender */
  60 struct http_client {
  61 /** the file descriptor of the client */
  62         int fd;
  63 /** address information about the client */
  64         struct sockaddr_in addr;
  65 /** the client's current status */
  66         enum http_status status;
  67 /** non-zero if we included \a fd in the read set */
  68         int check_r;
  69 /** non-zero if we included \a fd in the write set */
  70         int check_w;
  71 /** the position of this client in the client list */
  72         struct list_head node;
  73 /** the list of pending packets for this client */
  74         struct list_head packet_queue;
  75 /** the number of pending bytes for this client */
  76         unsigned long pq_bytes;
  77 };
  78
  79 /**
  80  * describes one queued data packet for a client
  81  *
  82  * The send function of the http sender checks each client fd for writing. If a
  83  * client fd is not ready, it tries to queue that packet for this client until
  84  * the number of queued bytes exceeds \p MAX_BACKLOG.
  85  */
  86 struct queued_packet {
  87 /** the length of the packet in bytes */
  88         unsigned int len;
  89 /** pointer to the packet data */
  90         char *packet;
  91 /** position of the packet in the packet list */
  92         struct list_head node;
  93 };
  94
  95 /**
  96  * describes one entry in the blacklist/whitelist of the http sender
  97  */
  98 struct access_info {
  99         /** the address to be black/whitelisted */
 100         struct in_addr addr;
 101         /** the netmask for this entry */
 102         int netmask;
 103         /** the position of this entry in the access_perm_list */
 104         struct list_head node;
 105 };
 106
 107 static int server_fd = -1, numclients;
 108 static struct sender *self;
 109
 110
 111 static void http_shutdown_client(struct http_client *hc, const char *msg)
 112 {
 113         struct queued_packet *qp, *tmp;
 114         PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
 115                 hc->fd, msg);
 116         numclients--;
 117         close(hc->fd);
 118
 119         list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
 120                 free(qp->packet);
 121                 list_del(&qp->node);
 122                 free(qp);
 123         }
 124         list_del(&hc->node);
 125         free(hc);
 126         return;
 127 }
 128
 129 static void http_shutdown_clients_real(void)
 130 {
 131         struct http_client *hc, *tmp;
 132         list_for_each_entry_safe(hc, tmp, &clients, node)
 133                 http_shutdown_client(hc, "afs request");
 134 }
 135 static void http_shutdown_clients(void)
 136 {
 137         struct http_client *hc, *tmp;
 138         list_for_each_entry_safe(hc, tmp, &clients, node)
 139                 if (hc->status == HTTP_STREAMING)
 140                         http_shutdown_client(hc, "afs request");
 141 }
 142
 143 static int http_send_msg(struct http_client *hc, const char *msg)
 144 {
 145         int ret = send_buffer(hc->fd, msg);
 146
 147         if (ret < 0)
 148                 http_shutdown_client(hc, "send msg failed");
 149         return ret;
 150 }
 151
 152 static void http_send_ok_msg(struct http_client *hc)
 153 {
 154         PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
 155         http_send_msg(hc, HTTP_OK_MSG);
 156 }
 157
 158 static int http_send_err_msg(struct http_client *hc)
 159 {
 160         PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
 161         return http_send_msg(hc, HTTP_ERR_MSG);
 162 }
 163
 164 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
 165 {
 166         struct queued_packet *qp;
 167         if (hc->pq_bytes + len > MAX_BACKLOG) {
 168                 http_shutdown_client(hc, "packet queue overrun");
 169                 return -E_QUEUE;
 170         }
 171         qp = para_malloc(sizeof(struct queued_packet));
 172         hc->pq_bytes += len;
 173         qp->packet = para_malloc(len);
 174         memcpy(qp->packet, buf, len);
 175         qp->len = len;
 176         list_add_tail(&qp->node, &hc->packet_queue);
 177         PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
 178         return 1;
 179 }
 180
 181 static int send_queued_packets(struct http_client *hc)
 182 {
 183         int ret;
 184         struct queued_packet *qp, *tmp;
 185
 186         if (list_empty(&hc->packet_queue))
 187                 return 1;
 188         list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
 189                 ret = write_ok(hc->fd);
 190                 if (ret <= 0)
 191                         return ret? -E_WRITE_OK : 0;
 192                 ret = write(hc->fd, qp->packet, qp->len);
 193                 if (ret < 0)
 194                         return ret;
 195                 if (ret != qp->len) {
 196                         qp->len -= ret;
 197                         memmove(qp->packet, qp->packet + ret, qp->len);
 198                         return 0;
 199                 }
 200                 hc->pq_bytes -= qp->len;
 201                 free(qp->packet);
 202                 list_del(&qp->node);
 203                 free(qp);
 204         }
 205         return 1;
 206 }
 207
 208 static void http_send(__unused struct audio_format *af,
 209                 long unsigned current_chunk,
 210                 __unused long unsigned chunks_sent, const char *buf, size_t len)
 211 {
 212         struct http_client *hc, *tmp;
 213         int ret;
 214
 215         list_for_each_entry_safe(hc, tmp, &clients, node) {
 216                 if (hc->status != HTTP_STREAMING &&
 217                                 hc->status != HTTP_READY_TO_STREAM)
 218                         continue;
 219                 if (hc->status == HTTP_READY_TO_STREAM) {
 220                         if (af->get_header_info && current_chunk) {
 221                                 /* need to send header */
 222                                 int hlen;
 223                                 char *buf = af->get_header_info(&hlen);
 224                                 if (!buf || hlen <= 0)
 225                                         continue; /* header not yet available */
 226                                 PARA_INFO_LOG("queueing header: %d\n", hlen);
 227                                 if (queue_packet(hc, buf, hlen) < 0)
 228                                         continue;
 229                         } else
 230                                 PARA_INFO_LOG("%s", "no need to queue header\n");
 231                         hc->status = HTTP_STREAMING;
 232                 }
 233                 ret = send_queued_packets(hc);
 234                 if (ret < 0) {
 235                         http_shutdown_client(hc, "send error");
 236                         continue;
 237                 }
 238                 if (!len)
 239                         continue;
 240                 if (!ret || write_ok(hc->fd) <= 0) {
 241                         PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
 242                                 " trying to queue packet\n", hc->fd,
 243                                 hc->pq_bytes);
 244                         queue_packet(hc, buf, len);
 245                         continue;
 246                 }
 247 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
 248                 ret = write(hc->fd, buf, len);
 249                 if (ret < 0) {
 250                         http_shutdown_client(hc, "send error");
 251                         continue;
 252                 }
 253                 if (ret != len)
 254                         queue_packet(hc, buf + ret, len - ret);
 255         }
 256 }
 257
 258 static int host_in_access_perm_list(struct http_client *hc)
 259 {
 260         struct access_info *ai, *tmp;
 261         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 262                 unsigned mask = ((~0) >> ai->netmask);
 263                 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
 264                         return 1;
 265         }
 266         return 0;
 267 }
 268
 269 static void http_post_select(__unused struct audio_format *af, fd_set *rfds,
 270                 fd_set *wfds)
 271 {
 272         int i = -1, match;
 273         struct http_client *hc, *tmp;
 274         const char *err_msg;
 275
 276         list_for_each_entry_safe(hc, tmp, &clients, node) {
 277                 i++;
 278 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
 279                 switch (hc->status) {
 280                 case HTTP_STREAMING: /* nothing to do */
 281                 case HTTP_READY_TO_STREAM:
 282                         break;
 283                 case HTTP_CONNECTED: /* need to recv get request */
 284                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 285                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 286                                                 < 0) {
 287                                         hc->status = HTTP_INVALID_GET_REQUEST;
 288                                 } else {
 289                                         hc->status = HTTP_GOT_GET_REQUEST;
 290                                         PARA_INFO_LOG("%s",
 291                                                 "received get request\n");
 292                                 }
 293                         }
 294                         break;
 295                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 296                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 297                                 hc->status = HTTP_SENT_OK_MSG;
 298                                 http_send_ok_msg(hc);
 299                         }
 300                         break;
 301                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 302                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 303                                 if (http_send_err_msg(hc) >= 0)
 304                                         http_shutdown_client(hc,
 305                                                 "invalid get request");
 306                         }
 307                         break;
 308                 case HTTP_SENT_OK_MSG: /* need to send header? */
 309                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 310                                 hc->status = HTTP_READY_TO_STREAM;
 311                         break;
 312                 }
 313         }
 314         if (!FD_ISSET(server_fd, rfds))
 315                 return;
 316         hc = para_calloc(sizeof(struct http_client));
 317         err_msg = "accept error";
 318         hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
 319         if (hc->fd <= 0)
 320                 goto err_out;
 321         PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
 322         if (conf.http_max_clients_arg > 0 && numclients >=
 323                         conf.http_max_clients_arg) {
 324                 err_msg = "server full";
 325                 goto err_out;
 326         }
 327         match = host_in_access_perm_list(hc);
 328         PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
 329         if ((match && !conf.http_default_deny_given) ||
 330                         (!match && conf.http_default_deny_given)) {
 331                 err_msg = "permission denied";
 332                 goto err_out;
 333         }
 334         hc->status = HTTP_CONNECTED;
 335         INIT_LIST_HEAD(&hc->packet_queue);
 336         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 337                 CLIENT_ADDR(hc), hc->fd);
 338         numclients++;
 339         list_add(&hc->node, &clients);
 340         return;
 341 err_out:
 342         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 343                 CLIENT_ADDR(hc), err_msg);
 344         if (hc->fd > 0)
 345                 close(hc->fd);
 346         free(hc);
 347 }
 348
 349 static void http_pre_select(struct audio_format *af, int *max_fileno, fd_set *rfds,
 350                 fd_set *wfds)
 351 {
 352         struct http_client *hc, *tmp;
 353
 354         if (server_fd < 0)
 355                 return;
 356         FD_SET(server_fd, rfds);
 357         *max_fileno = MAX(*max_fileno, server_fd);
 358         list_for_each_entry_safe(hc, tmp, &clients, node) {
 359                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 360                 hc->check_r = 0;
 361                 hc->check_w = 0;
 362                 switch (hc->status) {
 363                 case HTTP_STREAMING:
 364                 case HTTP_READY_TO_STREAM:
 365                         break;
 366                 case HTTP_CONNECTED: /* need to recv get request */
 367                         FD_SET(hc->fd, rfds);
 368                         *max_fileno = MAX(*max_fileno, hc->fd);
 369                         hc->check_r = 1;
 370                         break;
 371                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 372                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 373                         FD_SET(hc->fd, wfds);
 374                         *max_fileno = MAX(*max_fileno, hc->fd);
 375                         hc->check_w = 1;
 376                         break;
 377                 case HTTP_SENT_OK_MSG:
 378                         if (!af || !afs_playing())
 379                                 break; /* wait until server starts playing */
 380                         FD_SET(hc->fd, wfds);
 381                         *max_fileno = MAX(*max_fileno, hc->fd);
 382                         hc->check_w = 1;
 383                         break;
 384                 }
 385         }
 386 }
 387
 388 static int open_tcp_port(int port)
 389 {
 390         server_fd = init_tcp_socket(port);
 391         if (server_fd < 0) {
 392                 http_shutdown_clients_real();
 393                 self->status = SENDER_OFF;
 394                 return server_fd;
 395         }
 396         self->status = SENDER_ON;
 397         add_close_on_fork_list(server_fd);
 398         return 1;
 399 }
 400
 401 static int http_com_on(__unused struct sender_command_data *scd)
 402 {
 403         if (self->status == SENDER_ON)
 404                 return 1;
 405         return open_tcp_port(conf.http_port_arg);
 406 }
 407
 408 static int http_com_off(__unused struct sender_command_data *scd)
 409 {
 410         self->status = SENDER_OFF;
 411         if (server_fd > 0) {
 412                 close(server_fd);
 413                 del_close_on_fork_list(server_fd);
 414                 server_fd = -1;
 415         }
 416         http_shutdown_clients_real();
 417         return 1;
 418 }
 419
 420 static void del_perm_list_entry(struct sender_command_data *scd)
 421 {
 422         struct access_info *ai, *tmp;
 423
 424         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 425                 char *nad = para_strdup(inet_ntoa(ai->addr));
 426                 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
 427                                 ai->netmask == scd->netmask) {
 428                         PARA_NOTICE_LOG("removing %s/%i from access list\n",
 429                                 nad, ai->netmask);
 430                         list_del(&ai->node);
 431                         free(ai);
 432                 }
 433                 free(nad);
 434         }
 435 }
 436
 437 static void add_perm_list_entry(struct sender_command_data *scd)
 438 {
 439         struct access_info *ai = para_malloc(sizeof(struct access_info));
 440         ai->addr = scd->addr;
 441         ai->netmask = scd->netmask;
 442         PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
 443                 ai->netmask);
 444         list_add(&ai->node, &access_perm_list);
 445 }
 446
 447 static int http_com_deny(struct sender_command_data *scd)
 448 {
 449         if (conf.http_default_deny_given)
 450                 del_perm_list_entry(scd);
 451         else
 452                 add_perm_list_entry(scd);
 453         return 1;
 454 }
 455
 456 static int http_com_allow(struct sender_command_data *scd)
 457 {
 458         if (conf.http_default_deny_given)
 459                 add_perm_list_entry(scd);
 460         else
 461                 del_perm_list_entry(scd);
 462         return 1;
 463 }
 464
 465 static char *http_info(void)
 466 {
 467         char *clnts = NULL, *ap = NULL, *ret;
 468         struct access_info *ai, *tmp_ai;
 469         struct http_client *hc, *tmp_hc;
 470
 471         list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
 472                 char *tmp = make_message("%s%s/%d ", ap? ap : "",
 473                         inet_ntoa(ai->addr), ai->netmask);
 474                 free(ap);
 475                 ap = tmp;
 476         }
 477         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 478                 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
 479                         CLIENT_ADDR(hc), CLIENT_PORT(hc));
 480                 free(clnts);
 481                 clnts = tmp;
 482         }
 483         ret = make_message(
 484                 "http status: %s\n"
 485                 "http tcp port: %d\n"
 486                 "http clients: %d\n"
 487                 "http maximal number of clients: %d%s\n"
 488                 "http connected clients: %s\n"
 489                 "http access %s list: %s\n",
 490                 (self->status == SENDER_ON)? "on" : "off",
 491                 conf.http_port_arg,
 492                 numclients,
 493                 conf.http_max_clients_arg,
 494                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 495                 clnts? clnts : "(none)",
 496                 conf.http_default_deny_given? "allow" : "deny",
 497                 ap? ap : "(none)"
 498         );
 499         free(ap);
 500         free(clnts);
 501         return ret;
 502 }
 503
 504 static void init_access_control_list(void)
 505 {
 506         int i;
 507         struct sender_command_data scd;
 508
 509         INIT_LIST_HEAD(&access_perm_list);
 510         for (i = 0; i < conf.http_access_given; i++) {
 511                 char *arg = para_strdup(conf.http_access_arg[i]);
 512                 char *p = strchr(arg, '/');
 513                 if (!p)
 514                         goto err;
 515                 *p = '\0';
 516                 if (!inet_aton(arg, &scd.addr))
 517                         goto err;
 518                 scd.netmask = atoi(++p);
 519                 if (scd.netmask < 0 || scd.netmask > 32)
 520                         goto err;
 521                 add_perm_list_entry(&scd);
 522                 goto success;
 523 err:
 524                 PARA_CRIT_LOG("syntax error for http_access option "
 525                         "#%d, ignoring\n", i);
 526 success:
 527                 free(arg);
 528                 continue;
 529         }
 530 }
 531
 532 static char *http_help(void)
 533 {
 534         return make_message(
 535                 "usage: {on|off}\n"
 536                 "usage: {allow|deny} IP mask\n"
 537                 "example: allow 127.0.0.1 32\n"
 538         );
 539 }
 540
 541 /**
 542  * the init function of the http sender
 543  *
 544  * \param s pointer to the http sender struct
 545  *
 546  * It initializes all function pointers of \a s, init the client list and the
 547  * acess control list as well. If autostart is wanted, open the tcp port.
 548  */
 549 void http_send_init(struct sender *s)
 550 {
 551         INIT_LIST_HEAD(&clients);
 552         s->info = http_info;
 553         s->send = http_send;
 554         s->pre_select = http_pre_select;
 555         s->post_select = http_post_select;
 556         s->shutdown_clients = http_shutdown_clients;
 557         s->help = http_help;
 558         s->client_cmds[SENDER_ON] = http_com_on;
 559         s->client_cmds[SENDER_OFF] = http_com_off;
 560         s->client_cmds[SENDER_DENY] = http_com_deny;
 561         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 562         s->client_cmds[SENDER_ADD] = NULL;
 563         s->client_cmds[SENDER_DELETE] = NULL;
 564         self = s;
 565         init_access_control_list();
 566         if (!conf.http_no_autostart_given)
 567                 open_tcp_port(conf.http_port_arg);
 568         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 569 }