http_send.c

   1 /*
   2  * Copyright (C) 2005-2007 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 "vss.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 #include "fd.h"
  33
  34 /** \cond convert sock_addr_in to ascii */
  35 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
  36 /* get the port number of a struct http_client */
  37 #define CLIENT_PORT(hc) (hc)->addr.sin_port
  38 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  39 /** \endcond */
  40
  41 /** the possible states of a client from the server's POV */
  42 enum http_status {
  43         HTTP_CONNECTED,
  44         HTTP_GOT_GET_REQUEST,
  45         HTTP_SENT_OK_MSG,
  46         HTTP_READY_TO_STREAM,
  47         HTTP_STREAMING,
  48         HTTP_INVALID_GET_REQUEST
  49 };
  50
  51 /** clients will be kicked if there are more than that many bytes pending */
  52 #define MAX_BACKLOG 40000
  53 /** the list of connected clients **/
  54 static struct list_head clients;
  55 /** the whitelist/blacklist */
  56 static struct list_head access_perm_list;
  57
  58 /** describes one client that connected the tcp port of the http sender */
  59 struct http_client {
  60 /** the file descriptor of the client */
  61         int fd;
  62 /** address information about the client */
  63         struct sockaddr_in addr;
  64 /** the client's current status */
  65         enum http_status status;
  66 /** non-zero if we included \a fd in the read set */
  67         int check_r;
  68 /** non-zero if we included \a fd in the write set */
  69         int check_w;
  70 /** the position of this client in the client list */
  71         struct list_head node;
  72 /** the list of pending packets for this client */
  73         struct list_head packet_queue;
  74 /** the number of pending bytes for this client */
  75         unsigned long pq_bytes;
  76 };
  77
  78 /**
  79  * describes one queued data packet for a client
  80  *
  81  * The send function of the http sender checks each client fd for writing. If a
  82  * client fd is not ready, it tries to queue that packet for this client until
  83  * the number of queued bytes exceeds \p MAX_BACKLOG.
  84  */
  85 struct queued_packet {
  86 /** the length of the packet in bytes */
  87         unsigned int len;
  88 /** pointer to the packet data */
  89         char *packet;
  90 /** position of the packet in the packet list */
  91         struct list_head node;
  92 };
  93
  94 /**
  95  * describes one entry in the blacklist/whitelist of the http sender
  96  */
  97 struct access_info {
  98         /** the address to be black/whitelisted */
  99         struct in_addr addr;
 100         /** the netmask for this entry */
 101         int netmask;
 102         /** the position of this entry in the access_perm_list */
 103         struct list_head node;
 104 };
 105
 106 static int server_fd = -1, numclients;
 107 static struct sender *self;
 108
 109
 110 static void http_shutdown_client(struct http_client *hc, const char *msg)
 111 {
 112         struct queued_packet *qp, *tmp;
 113         PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
 114                 hc->fd, msg);
 115         numclients--;
 116         close(hc->fd);
 117         del_close_on_fork_list(hc->fd);
 118         list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
 119                 free(qp->packet);
 120                 list_del(&qp->node);
 121                 free(qp);
 122         }
 123         list_del(&hc->node);
 124         free(hc);
 125 }
 126
 127 static void http_shutdown_clients(void)
 128 {
 129         struct http_client *hc, *tmp;
 130         list_for_each_entry_safe(hc, tmp, &clients, node)
 131                 http_shutdown_client(hc, "vss request");
 132 }
 133
 134 static int http_send_msg(struct http_client *hc, const char *msg)
 135 {
 136         int ret = send_buffer(hc->fd, msg);
 137
 138         if (ret < 0)
 139                 http_shutdown_client(hc, "send msg failed");
 140         return ret;
 141 }
 142
 143 static void http_send_ok_msg(struct http_client *hc)
 144 {
 145         PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
 146         http_send_msg(hc, HTTP_OK_MSG);
 147 }
 148
 149 static int http_send_err_msg(struct http_client *hc)
 150 {
 151         PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
 152         return http_send_msg(hc, HTTP_ERR_MSG);
 153 }
 154
 155 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
 156 {
 157         struct queued_packet *qp;
 158         if (hc->pq_bytes + len > MAX_BACKLOG) {
 159                 http_shutdown_client(hc, "packet queue overrun");
 160                 return -E_QUEUE;
 161         }
 162         qp = para_malloc(sizeof(struct queued_packet));
 163         hc->pq_bytes += len;
 164         qp->packet = para_malloc(len);
 165         memcpy(qp->packet, buf, len);
 166         qp->len = len;
 167         list_add_tail(&qp->node, &hc->packet_queue);
 168         PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
 169         return 1;
 170 }
 171
 172 static int send_queued_packets(struct http_client *hc)
 173 {
 174         int ret;
 175         struct queued_packet *qp, *tmp;
 176
 177         if (list_empty(&hc->packet_queue))
 178                 return 1;
 179         list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
 180                 ret = write_ok(hc->fd);
 181                 if (ret <= 0)
 182                         return ret? -E_WRITE_OK : 0;
 183                 ret = write(hc->fd, qp->packet, qp->len);
 184                 if (ret < 0)
 185                         return ret;
 186                 if (ret != qp->len) {
 187                         qp->len -= ret;
 188                         memmove(qp->packet, qp->packet + ret, qp->len);
 189                         return 0;
 190                 }
 191                 hc->pq_bytes -= qp->len;
 192                 free(qp->packet);
 193                 list_del(&qp->node);
 194                 free(qp);
 195         }
 196         return 1;
 197 }
 198
 199 static void http_send( long unsigned current_chunk,
 200         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 201 {
 202         struct http_client *hc, *tmp;
 203         int ret;
 204
 205         list_for_each_entry_safe(hc, tmp, &clients, node) {
 206                 if (hc->status != HTTP_STREAMING &&
 207                                 hc->status != HTTP_READY_TO_STREAM)
 208                         continue;
 209                 if (hc->status == HTTP_READY_TO_STREAM) {
 210                         int hlen;
 211                         char *hbuf = vss_get_header(&hlen);
 212                         if (hbuf && hlen > 0 && current_chunk) {
 213                                 /* need to send header */
 214                                 PARA_INFO_LOG("queueing header: %d\n", hlen);
 215                                 if (queue_packet(hc, hbuf, hlen) < 0)
 216                                         continue;
 217                         } else
 218                                 PARA_INFO_LOG("%s", "no need to queue header\n");
 219                         hc->status = HTTP_STREAMING;
 220                 }
 221                 ret = send_queued_packets(hc);
 222                 if (ret < 0) {
 223                         http_shutdown_client(hc, "send error");
 224                         continue;
 225                 }
 226                 if (!len)
 227                         continue;
 228                 if (!ret || write_ok(hc->fd) <= 0) {
 229                         PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
 230                                 " trying to queue packet\n", hc->fd,
 231                                 hc->pq_bytes);
 232                         queue_packet(hc, buf, len);
 233                         continue;
 234                 }
 235 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
 236                 ret = write(hc->fd, buf, len);
 237                 if (ret < 0) {
 238                         http_shutdown_client(hc, "send error");
 239                         continue;
 240                 }
 241                 if (ret != len)
 242                         queue_packet(hc, buf + ret, len - ret);
 243         }
 244 }
 245
 246 static int host_in_access_perm_list(struct http_client *hc)
 247 {
 248         struct access_info *ai, *tmp;
 249         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 250                 unsigned mask = ((~0) >> ai->netmask);
 251                 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
 252                         return 1;
 253         }
 254         return 0;
 255 }
 256
 257 static void http_post_select(fd_set *rfds, fd_set *wfds)
 258 {
 259         int i = -1, match;
 260         struct http_client *hc, *tmp;
 261         const char *err_msg;
 262
 263         list_for_each_entry_safe(hc, tmp, &clients, node) {
 264                 i++;
 265 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
 266                 switch (hc->status) {
 267                 case HTTP_STREAMING: /* nothing to do */
 268                 case HTTP_READY_TO_STREAM:
 269                         break;
 270                 case HTTP_CONNECTED: /* need to recv get request */
 271                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 272                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 273                                                 < 0) {
 274                                         hc->status = HTTP_INVALID_GET_REQUEST;
 275                                 } else {
 276                                         hc->status = HTTP_GOT_GET_REQUEST;
 277                                         PARA_INFO_LOG("%s",
 278                                                 "received get request\n");
 279                                 }
 280                         }
 281                         break;
 282                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 283                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 284                                 hc->status = HTTP_SENT_OK_MSG;
 285                                 http_send_ok_msg(hc);
 286                         }
 287                         break;
 288                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 289                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 290                                 if (http_send_err_msg(hc) >= 0)
 291                                         http_shutdown_client(hc,
 292                                                 "invalid get request");
 293                         }
 294                         break;
 295                 case HTTP_SENT_OK_MSG: /* need to send header? */
 296                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 297                                 hc->status = HTTP_READY_TO_STREAM;
 298                         break;
 299                 }
 300         }
 301         if (!FD_ISSET(server_fd, rfds))
 302                 return;
 303         hc = para_calloc(sizeof(struct http_client));
 304         err_msg = "accept error";
 305         hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
 306         if (hc->fd <= 0)
 307                 goto err_out;
 308         PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
 309         if (conf.http_max_clients_arg > 0 && numclients >=
 310                         conf.http_max_clients_arg) {
 311                 err_msg = "server full";
 312                 goto err_out;
 313         }
 314         match = host_in_access_perm_list(hc);
 315         PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
 316         if ((match && !conf.http_default_deny_given) ||
 317                         (!match && conf.http_default_deny_given)) {
 318                 err_msg = "permission denied";
 319                 goto err_out;
 320         }
 321         hc->status = HTTP_CONNECTED;
 322         INIT_LIST_HEAD(&hc->packet_queue);
 323         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 324                 CLIENT_ADDR(hc), hc->fd);
 325         numclients++;
 326         para_list_add(&hc->node, &clients);
 327         add_close_on_fork_list(hc->fd);
 328         mark_fd_nonblock(hc->fd);
 329         return;
 330 err_out:
 331         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 332                 CLIENT_ADDR(hc), err_msg);
 333         if (hc->fd > 0)
 334                 close(hc->fd);
 335         free(hc);
 336 }
 337
 338 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 339 {
 340         struct http_client *hc, *tmp;
 341
 342         if (server_fd < 0)
 343                 return;
 344         para_fd_set(server_fd, rfds, max_fileno);
 345         list_for_each_entry_safe(hc, tmp, &clients, node) {
 346                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 347                 hc->check_r = 0;
 348                 hc->check_w = 0;
 349                 switch (hc->status) {
 350                 case HTTP_STREAMING:
 351                 case HTTP_READY_TO_STREAM:
 352                         break;
 353                 case HTTP_CONNECTED: /* need to recv get request */
 354                         para_fd_set(hc->fd, rfds, max_fileno);
 355                         hc->check_r = 1;
 356                         break;
 357                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 358                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 359                         para_fd_set(hc->fd, wfds, max_fileno);
 360                         hc->check_w = 1;
 361                         break;
 362                 case HTTP_SENT_OK_MSG:
 363                         if (!vss_playing())
 364                                 break; /* wait until server starts playing */
 365                         para_fd_set(hc->fd, wfds, max_fileno);
 366                         hc->check_w = 1;
 367                         break;
 368                 }
 369         }
 370 }
 371
 372 static int open_tcp_port(int port)
 373 {
 374         int ret;
 375
 376         server_fd = init_tcp_socket(port);
 377         if (server_fd < 0) {
 378                 http_shutdown_clients();
 379                 self->status = SENDER_OFF;
 380                 return server_fd;
 381         }
 382         ret = mark_fd_nonblock(server_fd);
 383         if (ret < 0) {
 384                 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
 385                 exit(EXIT_FAILURE);
 386         }
 387         self->status = SENDER_ON;
 388         add_close_on_fork_list(server_fd);
 389         return 1;
 390 }
 391
 392 static int http_com_on(__a_unused struct sender_command_data *scd)
 393 {
 394         if (self->status == SENDER_ON)
 395                 return 1;
 396         return open_tcp_port(conf.http_port_arg);
 397 }
 398
 399 static int http_com_off(__a_unused struct sender_command_data *scd)
 400 {
 401         self->status = SENDER_OFF;
 402         if (server_fd > 0) {
 403                 close(server_fd);
 404                 del_close_on_fork_list(server_fd);
 405                 server_fd = -1;
 406         }
 407         http_shutdown_clients();
 408         return 1;
 409 }
 410
 411 static void del_perm_list_entry(struct sender_command_data *scd)
 412 {
 413         struct access_info *ai, *tmp;
 414
 415         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 416                 char *nad = para_strdup(inet_ntoa(ai->addr));
 417                 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
 418                                 ai->netmask == scd->netmask) {
 419                         PARA_NOTICE_LOG("removing %s/%i from access list\n",
 420                                 nad, ai->netmask);
 421                         list_del(&ai->node);
 422                         free(ai);
 423                 }
 424                 free(nad);
 425         }
 426 }
 427
 428 static void add_perm_list_entry(struct sender_command_data *scd)
 429 {
 430         struct access_info *ai = para_malloc(sizeof(struct access_info));
 431         ai->addr = scd->addr;
 432         ai->netmask = scd->netmask;
 433         PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
 434                 ai->netmask);
 435         para_list_add(&ai->node, &access_perm_list);
 436 }
 437
 438 static int http_com_deny(struct sender_command_data *scd)
 439 {
 440         if (conf.http_default_deny_given)
 441                 del_perm_list_entry(scd);
 442         else
 443                 add_perm_list_entry(scd);
 444         return 1;
 445 }
 446
 447 static int http_com_allow(struct sender_command_data *scd)
 448 {
 449         if (conf.http_default_deny_given)
 450                 add_perm_list_entry(scd);
 451         else
 452                 del_perm_list_entry(scd);
 453         return 1;
 454 }
 455
 456 static char *http_info(void)
 457 {
 458         char *clnts = NULL, *ap = NULL, *ret;
 459         struct access_info *ai, *tmp_ai;
 460         struct http_client *hc, *tmp_hc;
 461
 462         list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
 463                 char *tmp = make_message("%s%s/%d ", ap? ap : "",
 464                         inet_ntoa(ai->addr), ai->netmask);
 465                 free(ap);
 466                 ap = tmp;
 467         }
 468         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 469                 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
 470                         CLIENT_ADDR(hc), CLIENT_PORT(hc));
 471                 free(clnts);
 472                 clnts = tmp;
 473         }
 474         ret = make_message(
 475                 "http status: %s\n"
 476                 "http tcp port: %d\n"
 477                 "http clients: %d\n"
 478                 "http maximal number of clients: %d%s\n"
 479                 "http connected clients: %s\n"
 480                 "http access %s list: %s\n",
 481                 (self->status == SENDER_ON)? "on" : "off",
 482                 conf.http_port_arg,
 483                 numclients,
 484                 conf.http_max_clients_arg,
 485                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 486                 clnts? clnts : "(none)",
 487                 conf.http_default_deny_given? "allow" : "deny",
 488                 ap? ap : "(none)"
 489         );
 490         free(ap);
 491         free(clnts);
 492         return ret;
 493 }
 494
 495 static void init_access_control_list(void)
 496 {
 497         int i;
 498         struct sender_command_data scd;
 499
 500         INIT_LIST_HEAD(&access_perm_list);
 501         for (i = 0; i < conf.http_access_given; i++) {
 502                 char *arg = para_strdup(conf.http_access_arg[i]);
 503                 char *p = strchr(arg, '/');
 504                 if (!p)
 505                         goto err;
 506                 *p = '\0';
 507                 if (!inet_aton(arg, &scd.addr))
 508                         goto err;
 509                 scd.netmask = atoi(++p);
 510                 if (scd.netmask < 0 || scd.netmask > 32)
 511                         goto err;
 512                 add_perm_list_entry(&scd);
 513                 goto success;
 514 err:
 515                 PARA_CRIT_LOG("syntax error for http_access option "
 516                         "#%d, ignoring\n", i);
 517 success:
 518                 free(arg);
 519                 continue;
 520         }
 521 }
 522
 523 static char *http_help(void)
 524 {
 525         return make_message(
 526                 "usage: {on|off}\n"
 527                 "usage: {allow|deny} IP mask\n"
 528                 "example: allow 127.0.0.1 32\n"
 529         );
 530 }
 531
 532 /**
 533  * the init function of the http sender
 534  *
 535  * \param s pointer to the http sender struct
 536  *
 537  * It initializes all function pointers of \a s, init the client list and the
 538  * acess control list as well. If autostart is wanted, open the tcp port.
 539  */
 540 void http_send_init(struct sender *s)
 541 {
 542         INIT_LIST_HEAD(&clients);
 543         s->info = http_info;
 544         s->send = http_send;
 545         s->pre_select = http_pre_select;
 546         s->post_select = http_post_select;
 547         s->shutdown_clients = http_shutdown_clients;
 548         s->help = http_help;
 549         s->client_cmds[SENDER_ON] = http_com_on;
 550         s->client_cmds[SENDER_OFF] = http_com_off;
 551         s->client_cmds[SENDER_DENY] = http_com_deny;
 552         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 553         s->client_cmds[SENDER_ADD] = NULL;
 554         s->client_cmds[SENDER_DELETE] = NULL;
 555         self = s;
 556         init_access_control_list();
 557         if (!conf.http_no_autostart_given)
 558                 open_tcp_port(conf.http_port_arg); /* ignore errors */
 559         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 560 }