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 write_ok(int fd)
 182 {
 183         struct timeval tv = {0, 0};
 184         fd_set wfds;
 185         int ret;
 186 again:
 187         FD_ZERO(&wfds);
 188         FD_SET(fd, &wfds);
 189         ret = select(fd + 1, NULL, &wfds, NULL, &tv);
 190         if (ret < 0 && errno == EINTR)
 191                 goto again;
 192         if (ret < 0)
 193                 ret = -E_WRITE_OK;
 194         return ret;
 195 }
 196
 197
 198 static int send_queued_packets(struct http_client *hc)
 199 {
 200         int ret;
 201         struct queued_packet *qp, *tmp;
 202
 203         if (list_empty(&hc->packet_queue))
 204                 return 1;
 205         list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
 206                 ret = write_ok(hc->fd);
 207                 if (ret <= 0)
 208                         return ret;
 209                 ret = write(hc->fd, qp->packet, qp->len);
 210                 if (ret < 0)
 211                         return ret;
 212                 if (ret != qp->len) {
 213                         qp->len -= ret;
 214                         memmove(qp->packet, qp->packet + ret, qp->len);
 215                         return 0;
 216                 }
 217                 hc->pq_bytes -= qp->len;
 218                 free(qp->packet);
 219                 list_del(&qp->node);
 220                 free(qp);
 221         }
 222         return 1;
 223 }
 224
 225 static void http_send(__unused struct audio_format *af,
 226                 long unsigned current_chunk,
 227                 __unused long unsigned chunks_sent, const char *buf, size_t len)
 228 {
 229         struct http_client *hc, *tmp;
 230         int ret;
 231
 232         list_for_each_entry_safe(hc, tmp, &clients, node) {
 233                 if (hc->status != HTTP_STREAMING &&
 234                                 hc->status != HTTP_READY_TO_STREAM)
 235                         continue;
 236                 if (hc->status == HTTP_READY_TO_STREAM) {
 237                         if (af->get_header_info && current_chunk) {
 238                                 /* need to send header */
 239                                 int hlen;
 240                                 char *buf = af->get_header_info(&hlen);
 241                                 if (!buf || hlen <= 0)
 242                                         continue; /* header not yet available */
 243                                 PARA_INFO_LOG("queueing header: %d\n", hlen);
 244                                 if (queue_packet(hc, buf, hlen) < 0)
 245                                         continue;
 246                         } else
 247                                 PARA_INFO_LOG("%s", "no need to queue header\n");
 248                         hc->status = HTTP_STREAMING;
 249                 }
 250                 ret = send_queued_packets(hc);
 251                 if (ret < 0) {
 252                         http_shutdown_client(hc, "send error");
 253                         continue;
 254                 }
 255                 if (!len)
 256                         continue;
 257                 if (!ret || write_ok(hc->fd) <= 0) {
 258                         PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
 259                                 " trying to queue packet\n", hc->fd,
 260                                 hc->pq_bytes);
 261                         queue_packet(hc, buf, len);
 262                         continue;
 263                 }
 264 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
 265                 ret = write(hc->fd, buf, len);
 266                 if (ret < 0) {
 267                         http_shutdown_client(hc, "send error");
 268                         continue;
 269                 }
 270                 if (ret != len)
 271                         queue_packet(hc, buf + ret, len - ret);
 272         }
 273 }
 274
 275 static int host_in_access_perm_list(struct http_client *hc)
 276 {
 277         struct access_info *ai, *tmp;
 278         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 279                 unsigned mask = ((~0) >> ai->netmask);
 280                 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
 281                         return 1;
 282         }
 283         return 0;
 284 }
 285
 286 static void http_post_select(__unused struct audio_format *af, fd_set *rfds,
 287                 fd_set *wfds)
 288 {
 289         int i = -1, match;
 290         struct http_client *hc, *tmp;
 291         char *err_msg;
 292
 293         list_for_each_entry_safe(hc, tmp, &clients, node) {
 294                 i++;
 295 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
 296                 switch (hc->status) {
 297                 case HTTP_STREAMING: /* nothing to do */
 298                 case HTTP_READY_TO_STREAM:
 299                         break;
 300                 case HTTP_CONNECTED: /* need to recv get request */
 301                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 302                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 303                                                 < 0) {
 304                                         hc->status = HTTP_INVALID_GET_REQUEST;
 305                                 } else {
 306                                         hc->status = HTTP_GOT_GET_REQUEST;
 307                                         PARA_INFO_LOG("%s",
 308                                                 "received get request\n");
 309                                 }
 310                         }
 311                         break;
 312                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 313                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 314                                 hc->status = HTTP_SENT_OK_MSG;
 315                                 http_send_ok_msg(hc);
 316                         }
 317                         break;
 318                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 319                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 320                                 if (http_send_err_msg(hc) >= 0)
 321                                         http_shutdown_client(hc,
 322                                                 "invalid get request");
 323                         }
 324                         break;
 325                 case HTTP_SENT_OK_MSG: /* need to send header? */
 326                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 327                                 hc->status = HTTP_READY_TO_STREAM;
 328                         break;
 329                 }
 330         }
 331         if (!FD_ISSET(server_fd, rfds))
 332                 return;
 333         hc = para_calloc(sizeof(struct http_client));
 334         err_msg = "accept error";
 335         hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
 336         if (hc->fd <= 0)
 337                 goto err_out;
 338         PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
 339         if (conf.http_max_clients_arg > 0 && numclients >=
 340                         conf.http_max_clients_arg) {
 341                 err_msg = "server full";
 342                 goto err_out;
 343         }
 344         match = host_in_access_perm_list(hc);
 345         PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
 346         if ((match && !conf.http_default_deny_given) ||
 347                         (!match && conf.http_default_deny_given)) {
 348                 err_msg = "permission denied";
 349                 goto err_out;
 350         }
 351         hc->status = HTTP_CONNECTED;
 352         INIT_LIST_HEAD(&hc->packet_queue);
 353         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 354                 CLIENT_ADDR(hc), hc->fd);
 355         numclients++;
 356         list_add(&hc->node, &clients);
 357         return;
 358 err_out:
 359         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 360                 CLIENT_ADDR(hc), err_msg);
 361         if (hc->fd > 0)
 362                 close(hc->fd);
 363         free(hc);
 364 }
 365
 366 static void http_pre_select(struct audio_format *af, int *max_fileno, fd_set *rfds,
 367                 fd_set *wfds)
 368 {
 369         struct http_client *hc, *tmp;
 370
 371         if (server_fd < 0)
 372                 return;
 373         FD_SET(server_fd, rfds);
 374         *max_fileno = MAX(*max_fileno, server_fd);
 375         list_for_each_entry_safe(hc, tmp, &clients, node) {
 376                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 377                 hc->check_r = 0;
 378                 hc->check_w = 0;
 379                 switch (hc->status) {
 380                 case HTTP_STREAMING:
 381                 case HTTP_READY_TO_STREAM:
 382                         break;
 383                 case HTTP_CONNECTED: /* need to recv get request */
 384                         FD_SET(hc->fd, rfds);
 385                         *max_fileno = MAX(*max_fileno, hc->fd);
 386                         hc->check_r = 1;
 387                         break;
 388                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 389                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 390                         FD_SET(hc->fd, wfds);
 391                         *max_fileno = MAX(*max_fileno, hc->fd);
 392                         hc->check_w = 1;
 393                         break;
 394                 case HTTP_SENT_OK_MSG:
 395                         if (!af || !afs_playing())
 396                                 break; /* wait until server starts playing */
 397                         FD_SET(hc->fd, wfds);
 398                         *max_fileno = MAX(*max_fileno, hc->fd);
 399                         hc->check_w = 1;
 400                         break;
 401                 }
 402         }
 403 }
 404
 405 static int open_tcp_port(int port)
 406 {
 407         server_fd = init_tcp_socket(port);
 408         if (server_fd < 0) {
 409                 http_shutdown_clients_real();
 410                 self->status = SENDER_OFF;
 411                 return server_fd;
 412         }
 413         self->status = SENDER_ON;
 414         add_close_on_fork_list(server_fd);
 415         return 1;
 416 }
 417
 418 static int http_com_on(__unused struct sender_command_data *scd)
 419 {
 420         if (self->status == SENDER_ON)
 421                 return 1;
 422         return open_tcp_port(conf.http_port_arg);
 423 }
 424
 425 static int http_com_off(__unused struct sender_command_data *scd)
 426 {
 427         self->status = SENDER_OFF;
 428         if (server_fd > 0) {
 429                 close(server_fd);
 430                 del_close_on_fork_list(server_fd);
 431                 server_fd = -1;
 432         }
 433         http_shutdown_clients_real();
 434         return 1;
 435 }
 436
 437 static void del_perm_list_entry(struct sender_command_data *scd)
 438 {
 439         struct access_info *ai, *tmp;
 440
 441         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 442                 char *nad = para_strdup(inet_ntoa(ai->addr));
 443                 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
 444                                 ai->netmask == scd->netmask) {
 445                         PARA_NOTICE_LOG("removing %s/%i from access list\n",
 446                                 nad, ai->netmask);
 447                         list_del(&ai->node);
 448                         free(ai);
 449                 }
 450                 free(nad);
 451         }
 452 }
 453
 454 static void add_perm_list_entry(struct sender_command_data *scd)
 455 {
 456         struct access_info *ai = para_malloc(sizeof(struct access_info));
 457         ai->addr = scd->addr;
 458         ai->netmask = scd->netmask;
 459         PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
 460                 ai->netmask);
 461         list_add(&ai->node, &access_perm_list);
 462 }
 463
 464 static int http_com_deny(struct sender_command_data *scd)
 465 {
 466         if (conf.http_default_deny_given)
 467                 del_perm_list_entry(scd);
 468         else
 469                 add_perm_list_entry(scd);
 470         return 1;
 471 }
 472
 473 static int http_com_allow(struct sender_command_data *scd)
 474 {
 475         if (conf.http_default_deny_given)
 476                 add_perm_list_entry(scd);
 477         else
 478                 del_perm_list_entry(scd);
 479         return 1;
 480 }
 481
 482 static char *http_info(void)
 483 {
 484         char *clnts = NULL, *ap = NULL, *ret;
 485         struct access_info *ai, *tmp_ai;
 486         struct http_client *hc, *tmp_hc;
 487
 488         list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
 489                 char *tmp = make_message("%s%s/%d ", ap? ap : "",
 490                         inet_ntoa(ai->addr), ai->netmask);
 491                 free(ap);
 492                 ap = tmp;
 493         }
 494         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 495                 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
 496                         CLIENT_ADDR(hc), CLIENT_PORT(hc));
 497                 free(clnts);
 498                 clnts = tmp;
 499         }
 500         ret = make_message(
 501                 "http status: %s\n"
 502                 "http tcp port: %d\n"
 503                 "http clients: %d\n"
 504                 "http maximal number of clients: %d%s\n"
 505                 "http connected clients: %s\n"
 506                 "http access %s list: %s\n",
 507                 (self->status == SENDER_ON)? "on" : "off",
 508                 conf.http_port_arg,
 509                 numclients,
 510                 conf.http_max_clients_arg,
 511                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 512                 clnts? clnts : "(none)",
 513                 conf.http_default_deny_given? "allow" : "deny",
 514                 ap? ap : "(none)"
 515         );
 516         free(ap);
 517         free(clnts);
 518         return ret;
 519 }
 520
 521 static void init_access_control_list(void)
 522 {
 523         int i;
 524         struct sender_command_data scd;
 525
 526         INIT_LIST_HEAD(&access_perm_list);
 527         for (i = 0; i < conf.http_access_given; i++) {
 528                 char *arg = para_strdup(conf.http_access_arg[i]);
 529                 char *p = strchr(arg, '/');
 530                 if (!p)
 531                         goto err;
 532                 *p = '\0';
 533                 if (!inet_aton(arg, &scd.addr))
 534                         goto err;
 535                 scd.netmask = atoi(++p);
 536                 if (scd.netmask < 0 || scd.netmask > 32)
 537                         goto err;
 538                 add_perm_list_entry(&scd);
 539                 goto success;
 540 err:
 541                 PARA_CRIT_LOG("syntax error for http_access option "
 542                         "#%d, ignoring\n", i);
 543 success:
 544                 free(arg);
 545                 continue;
 546         }
 547 }
 548
 549 static char *http_help(void)
 550 {
 551         return make_message(
 552                 "usage: {on|off}\n"
 553                 "usage: {allow|deny} IP mask\n"
 554                 "example: allow 127.0.0.1 32\n"
 555         );
 556 }
 557
 558 /**
 559  * the init function of the http sender
 560  *
 561  * \param s pointer to the http sender struct
 562  *
 563  * It initializes all function pointers of \a s, init the client list and the
 564  * acess control list as well. If autostart is wanted, open the tcp port.
 565  */
 566 void http_send_init(struct sender *s)
 567 {
 568         INIT_LIST_HEAD(&clients);
 569         s->info = http_info;
 570         s->send = http_send;
 571         s->pre_select = http_pre_select;
 572         s->post_select = http_post_select;
 573         s->shutdown_clients = http_shutdown_clients;
 574         s->help = http_help;
 575         s->client_cmds[SENDER_ON] = http_com_on;
 576         s->client_cmds[SENDER_OFF] = http_com_off;
 577         s->client_cmds[SENDER_DENY] = http_com_deny;
 578         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 579         s->client_cmds[SENDER_ADD] = NULL;
 580         s->client_cmds[SENDER_DELETE] = NULL;
 581         self = s;
 582         init_access_control_list();
 583         if (!conf.http_no_autostart_given)
 584                 open_tcp_port(conf.http_port_arg);
 585         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 586 }