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 "error.h"
  14 #include "string.h"
  15 #include "server.cmdline.h"
  16 #include "afh.h"
  17 #include "afs.h"
  18 #include "server.h"
  19 #include "http.h"
  20 #include "vss.h"
  21 #include "send.h"
  22 #include "list.h"
  23 #include "close_on_fork.h"
  24 #include "net.h"
  25 #include "fd.h"
  26 #include "chunk_queue.h"
  27
  28 /** \cond convert sock_addr_in to ascii */
  29 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
  30 /* get the port number of a struct http_client */
  31 #define CLIENT_PORT(hc) (hc)->addr.sin_port
  32 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  33 /** \endcond */
  34
  35 /** The possible states of a client from the server's POV. */
  36 enum http_status {
  37         /** We accepted the connection on the tcp socket. */
  38         HTTP_CONNECTED,
  39         /** Successfully received the get request. */
  40         HTTP_GOT_GET_REQUEST,
  41         /** We sent the OK message back to the client. */
  42         HTTP_SENT_OK_MSG,
  43         /** Connection established, we might need to send the audio file header. */
  44         HTTP_READY_TO_STREAM,
  45         /** Connection is ready for sending audio data. */
  46         HTTP_STREAMING,
  47         /** We didn't receive a valid get request. */
  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 400000
  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 chunks for this client. */
  73         struct chunk_queue *cq;
  74 };
  75
  76 /**
  77  * Describes one entry in the blacklist/whitelist of the http sender.
  78  */
  79 struct access_info {
  80         /** The address to be black/whitelisted. */
  81         struct in_addr addr;
  82         /** The netmask for this entry. */
  83         unsigned netmask;
  84         /** The position of this entry in the access_perm_list. */
  85         struct list_head node;
  86 };
  87
  88 static int server_fd = -1, numclients;
  89 static struct sender *self;
  90
  91
  92 static void http_shutdown_client(struct http_client *hc, const char *msg)
  93 {
  94         PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
  95                 hc->fd, msg);
  96         numclients--;
  97         close(hc->fd);
  98         del_close_on_fork_list(hc->fd);
  99         cq_destroy(hc->cq);
 100         list_del(&hc->node);
 101         free(hc);
 102 }
 103
 104 static void http_shutdown_clients(void)
 105 {
 106         struct http_client *hc, *tmp;
 107         list_for_each_entry_safe(hc, tmp, &clients, node)
 108                 http_shutdown_client(hc, "vss request");
 109 }
 110
 111 static int http_send_msg(struct http_client *hc, const char *msg)
 112 {
 113         int ret = send_buffer(hc->fd, msg);
 114
 115         if (ret < 0)
 116                 http_shutdown_client(hc, "send msg failed");
 117         return ret;
 118 }
 119
 120 static void http_send_ok_msg(struct http_client *hc)
 121 {
 122         PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
 123         http_send_msg(hc, HTTP_OK_MSG);
 124 }
 125
 126 static int http_send_err_msg(struct http_client *hc)
 127 {
 128         PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
 129         return http_send_msg(hc, HTTP_ERR_MSG);
 130 }
 131
 132 static int send_queued_chunks(struct http_client *hc)
 133 {
 134         struct queued_chunk *qc;
 135         while ((qc = cq_peek(hc->cq))) {
 136                 char *buf;
 137                 size_t len;
 138                 int ret = write_ok(hc->fd);
 139                 if (ret <= 0)
 140                         return ret? -E_WRITE_OK : 0;
 141                 cq_get(qc, &buf, &len);
 142                 ret = write(hc->fd, buf, len);
 143                 if (ret < 0)
 144                         return -E_SEND_QUEUED_CHUNK;
 145                 cq_update(hc->cq, ret);
 146                 if (ret != len)
 147                         return 1;
 148                 cq_dequeue(hc->cq);
 149         }
 150         return 1;
 151 }
 152
 153 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
 154         size_t sent)
 155 {
 156         int ret = cq_enqueue(hc->cq, chunk_num, sent);
 157         if (ret < 0)
 158                 http_shutdown_client(hc, "queue error");
 159         return ret;
 160 }
 161
 162 static void http_send( long unsigned current_chunk,
 163         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 164 {
 165         struct http_client *hc, *tmp;
 166         int ret;
 167
 168         list_for_each_entry_safe(hc, tmp, &clients, node) {
 169                 if (hc->status != HTTP_STREAMING &&
 170                                 hc->status != HTTP_READY_TO_STREAM)
 171                         continue;
 172                 if (hc->status == HTTP_READY_TO_STREAM) {
 173                         size_t hlen;
 174                         char *hbuf = vss_get_header(&hlen);
 175                         if (hbuf && hlen > 0 && current_chunk) {
 176                                 /* need to send header */
 177                                 PARA_INFO_LOG("queueing header: %zu\n", hlen);
 178                                 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
 179                                         continue;
 180                         } else
 181                                 PARA_INFO_LOG("no need to queue header\n");
 182                         hc->status = HTTP_STREAMING;
 183                 }
 184                 ret = send_queued_chunks(hc);
 185                 if (ret < 0) {
 186                         http_shutdown_client(hc, "queue send error");
 187                         continue;
 188                 }
 189                 if (!len)
 190                         continue;
 191                 if (!ret || write_ok(hc->fd) <= 0) {
 192                         queue_chunk_or_shutdown(hc, current_chunk, 0);
 193                         continue;
 194                 }
 195 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
 196                 ret = write(hc->fd, buf, len);
 197 //              PARA_DEBUG_LOG("ret: %d\n", ret);
 198                 if (ret < 0) {
 199                         http_shutdown_client(hc, "send error");
 200                         continue;
 201                 }
 202                 if (ret != len)
 203                         queue_chunk_or_shutdown(hc, current_chunk, ret);
 204         }
 205 }
 206
 207 static int host_in_access_perm_list(struct http_client *hc)
 208 {
 209         struct access_info *ai, *tmp;
 210         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 211                 unsigned mask = ((~0U) >> ai->netmask);
 212                 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
 213                         return 1;
 214         }
 215         return 0;
 216 }
 217
 218 static void http_post_select(fd_set *rfds, fd_set *wfds)
 219 {
 220         int i = -1, match;
 221         struct http_client *hc, *tmp;
 222         const char *err_msg;
 223
 224         list_for_each_entry_safe(hc, tmp, &clients, node) {
 225                 i++;
 226 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
 227                 switch (hc->status) {
 228                 case HTTP_STREAMING: /* nothing to do */
 229                 case HTTP_READY_TO_STREAM:
 230                         break;
 231                 case HTTP_CONNECTED: /* need to recv get request */
 232                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 233                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 234                                                 < 0) {
 235                                         hc->status = HTTP_INVALID_GET_REQUEST;
 236                                 } else {
 237                                         hc->status = HTTP_GOT_GET_REQUEST;
 238                                         PARA_INFO_LOG("%s",
 239                                                 "received get request\n");
 240                                 }
 241                         }
 242                         break;
 243                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 244                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 245                                 hc->status = HTTP_SENT_OK_MSG;
 246                                 http_send_ok_msg(hc);
 247                         }
 248                         break;
 249                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 250                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 251                                 if (http_send_err_msg(hc) >= 0)
 252                                         http_shutdown_client(hc,
 253                                                 "invalid get request");
 254                         }
 255                         break;
 256                 case HTTP_SENT_OK_MSG: /* need to send header? */
 257                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 258                                 hc->status = HTTP_READY_TO_STREAM;
 259                         break;
 260                 }
 261         }
 262         if (!FD_ISSET(server_fd, rfds))
 263                 return;
 264         hc = para_calloc(sizeof(struct http_client));
 265         err_msg = "accept error";
 266         hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
 267         if (hc->fd <= 0)
 268                 goto err_out;
 269         PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
 270         if (conf.http_max_clients_arg > 0 && numclients >=
 271                         conf.http_max_clients_arg) {
 272                 err_msg = "server full";
 273                 goto err_out;
 274         }
 275         match = host_in_access_perm_list(hc);
 276         PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
 277         if ((match && !conf.http_default_deny_given) ||
 278                         (!match && conf.http_default_deny_given)) {
 279                 err_msg = "permission denied";
 280                 goto err_out;
 281         }
 282         hc->status = HTTP_CONNECTED;
 283         hc->cq = cq_new(MAX_BACKLOG);
 284         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 285                 CLIENT_ADDR(hc), hc->fd);
 286         numclients++;
 287         para_list_add(&hc->node, &clients);
 288         add_close_on_fork_list(hc->fd);
 289         mark_fd_nonblock(hc->fd);
 290         return;
 291 err_out:
 292         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 293                 CLIENT_ADDR(hc), err_msg);
 294         if (hc->fd > 0)
 295                 close(hc->fd);
 296         free(hc);
 297 }
 298
 299 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 300 {
 301         struct http_client *hc, *tmp;
 302
 303         if (server_fd < 0)
 304                 return;
 305         para_fd_set(server_fd, rfds, max_fileno);
 306         list_for_each_entry_safe(hc, tmp, &clients, node) {
 307                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 308                 hc->check_r = 0;
 309                 hc->check_w = 0;
 310                 switch (hc->status) {
 311                 case HTTP_STREAMING:
 312                 case HTTP_READY_TO_STREAM:
 313                         break;
 314                 case HTTP_CONNECTED: /* need to recv get request */
 315                         para_fd_set(hc->fd, rfds, max_fileno);
 316                         hc->check_r = 1;
 317                         break;
 318                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 319                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 320                         para_fd_set(hc->fd, wfds, max_fileno);
 321                         hc->check_w = 1;
 322                         break;
 323                 case HTTP_SENT_OK_MSG:
 324                         if (!vss_playing())
 325                                 break; /* wait until server starts playing */
 326                         para_fd_set(hc->fd, wfds, max_fileno);
 327                         hc->check_w = 1;
 328                         break;
 329                 }
 330         }
 331 }
 332
 333 static int open_tcp_port(int port)
 334 {
 335         int ret;
 336
 337         server_fd = init_tcp_socket(port);
 338         if (server_fd < 0) {
 339                 http_shutdown_clients();
 340                 self->status = SENDER_OFF;
 341                 return server_fd;
 342         }
 343         ret = mark_fd_nonblock(server_fd);
 344         if (ret < 0) {
 345                 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
 346                 exit(EXIT_FAILURE);
 347         }
 348         self->status = SENDER_ON;
 349         add_close_on_fork_list(server_fd);
 350         return 1;
 351 }
 352
 353 static int http_com_on(__a_unused struct sender_command_data *scd)
 354 {
 355         if (self->status == SENDER_ON)
 356                 return 1;
 357         return open_tcp_port(conf.http_port_arg);
 358 }
 359
 360 static int http_com_off(__a_unused struct sender_command_data *scd)
 361 {
 362         self->status = SENDER_OFF;
 363         if (server_fd > 0) {
 364                 close(server_fd);
 365                 del_close_on_fork_list(server_fd);
 366                 server_fd = -1;
 367         }
 368         http_shutdown_clients();
 369         return 1;
 370 }
 371
 372 static void del_perm_list_entry(struct sender_command_data *scd)
 373 {
 374         struct access_info *ai, *tmp;
 375
 376         list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
 377                 char *nad = para_strdup(inet_ntoa(ai->addr));
 378                 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
 379                                 ai->netmask == scd->netmask) {
 380                         PARA_NOTICE_LOG("removing %s/%i from access list\n",
 381                                 nad, ai->netmask);
 382                         list_del(&ai->node);
 383                         free(ai);
 384                 }
 385                 free(nad);
 386         }
 387 }
 388
 389 static void add_perm_list_entry(struct sender_command_data *scd)
 390 {
 391         struct access_info *ai = para_malloc(sizeof(struct access_info));
 392         ai->addr = scd->addr;
 393         ai->netmask = scd->netmask;
 394         PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
 395                 ai->netmask);
 396         para_list_add(&ai->node, &access_perm_list);
 397 }
 398
 399 static int http_com_deny(struct sender_command_data *scd)
 400 {
 401         if (conf.http_default_deny_given)
 402                 del_perm_list_entry(scd);
 403         else
 404                 add_perm_list_entry(scd);
 405         return 1;
 406 }
 407
 408 static int http_com_allow(struct sender_command_data *scd)
 409 {
 410         if (conf.http_default_deny_given)
 411                 add_perm_list_entry(scd);
 412         else
 413                 del_perm_list_entry(scd);
 414         return 1;
 415 }
 416
 417 static char *http_info(void)
 418 {
 419         char *clnts = NULL, *ap = NULL, *ret;
 420         struct access_info *ai, *tmp_ai;
 421         struct http_client *hc, *tmp_hc;
 422
 423         list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
 424                 char *tmp = make_message("%s%s/%d ", ap? ap : "",
 425                         inet_ntoa(ai->addr), ai->netmask);
 426                 free(ap);
 427                 ap = tmp;
 428         }
 429         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 430                 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
 431                         CLIENT_ADDR(hc), CLIENT_PORT(hc));
 432                 free(clnts);
 433                 clnts = tmp;
 434         }
 435         ret = make_message(
 436                 "http status: %s\n"
 437                 "http tcp port: %d\n"
 438                 "http clients: %d\n"
 439                 "http maximal number of clients: %d%s\n"
 440                 "http connected clients: %s\n"
 441                 "http access %s list: %s\n",
 442                 (self->status == SENDER_ON)? "on" : "off",
 443                 conf.http_port_arg,
 444                 numclients,
 445                 conf.http_max_clients_arg,
 446                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 447                 clnts? clnts : "(none)",
 448                 conf.http_default_deny_given? "allow" : "deny",
 449                 ap? ap : "(none)"
 450         );
 451         free(ap);
 452         free(clnts);
 453         return ret;
 454 }
 455
 456 static void init_access_control_list(void)
 457 {
 458         int i;
 459         struct sender_command_data scd;
 460
 461         INIT_LIST_HEAD(&access_perm_list);
 462         for (i = 0; i < conf.http_access_given; i++) {
 463                 char *arg = para_strdup(conf.http_access_arg[i]);
 464                 char *p = strchr(arg, '/');
 465                 if (!p)
 466                         goto err;
 467                 *p = '\0';
 468                 if (!inet_pton(AF_INET, arg, &scd.addr))
 469                         goto err;
 470                 scd.netmask = atoi(++p);
 471                 if (scd.netmask < 0 || scd.netmask > 32)
 472                         goto err;
 473                 add_perm_list_entry(&scd);
 474                 goto success;
 475 err:
 476                 PARA_CRIT_LOG("syntax error for http_access option "
 477                         "#%d, ignoring\n", i);
 478 success:
 479                 free(arg);
 480                 continue;
 481         }
 482 }
 483
 484 static char *http_help(void)
 485 {
 486         return make_message(
 487                 "usage: {on|off}\n"
 488                 "usage: {allow|deny} IP mask\n"
 489                 "example: allow 127.0.0.1 32\n"
 490         );
 491 }
 492
 493 /**
 494  * The init function of the http sender.
 495  *
 496  * \param s Pointer to the http sender struct.
 497  *
 498  * It initializes all function pointers of \a s, the client list and the access
 499  * control list. If the autostart option was given, the tcp port is opened.
 500  */
 501 void http_send_init(struct sender *s)
 502 {
 503         INIT_LIST_HEAD(&clients);
 504         s->info = http_info;
 505         s->send = http_send;
 506         s->pre_select = http_pre_select;
 507         s->post_select = http_post_select;
 508         s->shutdown_clients = http_shutdown_clients;
 509         s->help = http_help;
 510         s->client_cmds[SENDER_ON] = http_com_on;
 511         s->client_cmds[SENDER_OFF] = http_com_off;
 512         s->client_cmds[SENDER_DENY] = http_com_deny;
 513         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 514         s->client_cmds[SENDER_ADD] = NULL;
 515         s->client_cmds[SENDER_DELETE] = NULL;
 516         self = s;
 517         init_access_control_list();
 518         if (!conf.http_no_autostart_given)
 519                 open_tcp_port(conf.http_port_arg); /* ignore errors */
 520         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 521 }