http_send.c

   1 /*
   2  * Copyright (C) 2005-2008 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 #include "acl.h"
  28
  29 /** Message sent to clients that do not send a valid get request. */
  30 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  31
  32
  33 /** The possible states of a client from the server's POV. */
  34 enum http_status {
  35         /** We accepted the connection on the tcp socket. */
  36         HTTP_CONNECTED,
  37         /** Successfully received the get request. */
  38         HTTP_GOT_GET_REQUEST,
  39         /** We sent the OK message back to the client. */
  40         HTTP_SENT_OK_MSG,
  41         /** Connection established, we might need to send the audio file header. */
  42         HTTP_READY_TO_STREAM,
  43         /** Connection is ready for sending audio data. */
  44         HTTP_STREAMING,
  45         /** We didn't receive a valid get request. */
  46         HTTP_INVALID_GET_REQUEST
  47 };
  48
  49 /** Clients will be kicked if there are more than that many bytes pending. */
  50 #define MAX_BACKLOG 400000
  51 /** The list of connected clients. */
  52 static struct list_head clients;
  53 /** The whitelist/blacklist. */
  54 static struct list_head http_acl;
  55
  56 /** Describes one client that connected the tcp port of the http sender. */
  57 struct http_client {
  58         /** The file descriptor of the client. */
  59         int fd;
  60         /** The socket `name' of the client. */
  61         char *name;
  62         /** The client's current status. */
  63         enum http_status status;
  64         /** Non-zero if we included \a fd in the read set.*/
  65         int check_r;
  66         /** Non-zero if we included \a fd in the write set. */
  67         int check_w;
  68         /** The position of this client in the client list. */
  69         struct list_head node;
  70         /** The list of pending chunks for this client. */
  71         struct chunk_queue *cq;
  72 };
  73
  74 static int server_fd = -1, numclients;
  75 static struct sender *self;
  76
  77
  78 static void http_shutdown_client(struct http_client *hc, const char *msg)
  79 {
  80         PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc->name, hc->fd,
  81                 msg);
  82         numclients--;
  83         free(hc->name);
  84         close(hc->fd);
  85         del_close_on_fork_list(hc->fd);
  86         cq_destroy(hc->cq);
  87         list_del(&hc->node);
  88         free(hc);
  89 }
  90
  91 static void http_shutdown_clients(void)
  92 {
  93         struct http_client *hc, *tmp;
  94         list_for_each_entry_safe(hc, tmp, &clients, node)
  95                 http_shutdown_client(hc, "vss request");
  96 }
  97
  98 static int http_send_msg(struct http_client *hc, const char *msg)
  99 {
 100         int ret = send_buffer(hc->fd, msg);
 101
 102         if (ret < 0)
 103                 http_shutdown_client(hc, "send msg failed");
 104         return ret;
 105 }
 106
 107 static void http_send_ok_msg(struct http_client *hc)
 108 {
 109         PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
 110         http_send_msg(hc, HTTP_OK_MSG);
 111 }
 112
 113 static int http_send_err_msg(struct http_client *hc)
 114 {
 115         PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
 116         return http_send_msg(hc, HTTP_ERR_MSG);
 117 }
 118
 119 static int send_queued_chunks(struct http_client *hc)
 120 {
 121         struct queued_chunk *qc;
 122         while ((qc = cq_peek(hc->cq))) {
 123                 char *buf;
 124                 size_t len;
 125                 int ret = write_ok(hc->fd);
 126                 if (ret <= 0)
 127                         return ret? -E_WRITE_OK : 0;
 128                 cq_get(qc, &buf, &len);
 129                 ret = write(hc->fd, buf, len);
 130                 if (ret < 0)
 131                         return -E_SEND_QUEUED_CHUNK;
 132                 cq_update(hc->cq, ret);
 133                 if (ret != len)
 134                         return 1;
 135                 cq_dequeue(hc->cq);
 136         }
 137         return 1;
 138 }
 139
 140 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
 141         size_t sent)
 142 {
 143         int ret = cq_enqueue(hc->cq, chunk_num, sent);
 144         if (ret < 0)
 145                 http_shutdown_client(hc, "queue error");
 146         return ret;
 147 }
 148
 149 static void http_send( long unsigned current_chunk,
 150         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 151 {
 152         struct http_client *hc, *tmp;
 153         int ret;
 154
 155         list_for_each_entry_safe(hc, tmp, &clients, node) {
 156                 if (hc->status != HTTP_STREAMING &&
 157                                 hc->status != HTTP_READY_TO_STREAM)
 158                         continue;
 159                 if (hc->status == HTTP_READY_TO_STREAM) {
 160                         size_t hlen;
 161                         char *hbuf = vss_get_header(&hlen);
 162                         if (hbuf && hlen > 0 && current_chunk) {
 163                                 /* need to send header */
 164                                 PARA_INFO_LOG("queueing header: %zu\n", hlen);
 165                                 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
 166                                         continue;
 167                         } else
 168                                 PARA_INFO_LOG("no need to queue header\n");
 169                         hc->status = HTTP_STREAMING;
 170                 }
 171                 ret = send_queued_chunks(hc);
 172                 if (ret < 0) {
 173                         http_shutdown_client(hc, "queue send error");
 174                         continue;
 175                 }
 176                 if (!len)
 177                         continue;
 178                 if (!ret || write_ok(hc->fd) <= 0) {
 179                         queue_chunk_or_shutdown(hc, current_chunk, 0);
 180                         continue;
 181                 }
 182 //              PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
 183                 ret = write(hc->fd, buf, len);
 184 //              PARA_DEBUG_LOG("ret: %d\n", ret);
 185                 if (ret < 0) {
 186                         http_shutdown_client(hc, "send error");
 187                         continue;
 188                 }
 189                 if (ret != len)
 190                         queue_chunk_or_shutdown(hc, current_chunk, ret);
 191         }
 192 }
 193
 194 static void http_post_select(fd_set *rfds, fd_set *wfds)
 195 {
 196         int i = -1, match;
 197         struct http_client *hc, *tmp;
 198         const char *err_msg;
 199
 200         list_for_each_entry_safe(hc, tmp, &clients, node) {
 201                 i++;
 202 //              PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
 203                 switch (hc->status) {
 204                 case HTTP_STREAMING: /* nothing to do */
 205                 case HTTP_READY_TO_STREAM:
 206                         break;
 207                 case HTTP_CONNECTED: /* need to recv get request */
 208                         if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
 209                                 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
 210                                                 < 0) {
 211                                         hc->status = HTTP_INVALID_GET_REQUEST;
 212                                 } else {
 213                                         hc->status = HTTP_GOT_GET_REQUEST;
 214                                         PARA_INFO_LOG("%s",
 215                                                 "received get request\n");
 216                                 }
 217                         }
 218                         break;
 219                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 220                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 221                                 hc->status = HTTP_SENT_OK_MSG;
 222                                 http_send_ok_msg(hc);
 223                         }
 224                         break;
 225                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 226                         if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
 227                                 if (http_send_err_msg(hc) >= 0)
 228                                         http_shutdown_client(hc,
 229                                                 "invalid get request");
 230                         }
 231                         break;
 232                 case HTTP_SENT_OK_MSG: /* need to send header? */
 233                         if (hc->check_w && FD_ISSET(hc->fd, wfds))
 234                                 hc->status = HTTP_READY_TO_STREAM;
 235                         break;
 236                 }
 237         }
 238         if (!FD_ISSET(server_fd, rfds))
 239                 return;
 240         hc = para_calloc(sizeof(struct http_client));
 241         err_msg = "accept error";
 242         hc->fd = para_accept(server_fd, NULL, 0);
 243         if (hc->fd <= 0)
 244                 goto err_out;
 245         hc->name = make_message("%s", remote_name(hc->fd));
 246         PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
 247         if (conf.http_max_clients_arg > 0 && numclients >=
 248                         conf.http_max_clients_arg) {
 249                 err_msg = "server full";
 250                 goto err_out;
 251         }
 252         match = acl_lookup(hc->fd, &http_acl);
 253         PARA_DEBUG_LOG("acl lookup returned %d\n", match);
 254         if ((match && !conf.http_default_deny_given) ||
 255                         (!match && conf.http_default_deny_given)) {
 256                 err_msg = "permission denied";
 257                 goto err_out;
 258         }
 259         hc->status = HTTP_CONNECTED;
 260         hc->cq = cq_new(MAX_BACKLOG);
 261         numclients++;
 262         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 263                 hc->name, hc->fd);
 264         para_list_add(&hc->node, &clients);
 265         add_close_on_fork_list(hc->fd);
 266         mark_fd_nonblocking(hc->fd);
 267         return;
 268 err_out:
 269         PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
 270                 hc->name, err_msg);
 271         if (hc->fd > 0)
 272                 close(hc->fd);
 273         free(hc);
 274 }
 275
 276 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 277 {
 278         struct http_client *hc, *tmp;
 279
 280         if (server_fd < 0)
 281                 return;
 282         para_fd_set(server_fd, rfds, max_fileno);
 283         list_for_each_entry_safe(hc, tmp, &clients, node) {
 284                 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
 285                 hc->check_r = 0;
 286                 hc->check_w = 0;
 287                 switch (hc->status) {
 288                 case HTTP_STREAMING:
 289                 case HTTP_READY_TO_STREAM:
 290                         break;
 291                 case HTTP_CONNECTED: /* need to recv get request */
 292                         para_fd_set(hc->fd, rfds, max_fileno);
 293                         hc->check_r = 1;
 294                         break;
 295                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 296                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 297                         para_fd_set(hc->fd, wfds, max_fileno);
 298                         hc->check_w = 1;
 299                         break;
 300                 case HTTP_SENT_OK_MSG:
 301                         if (!vss_playing())
 302                                 break; /* wait until server starts playing */
 303                         para_fd_set(hc->fd, wfds, max_fileno);
 304                         hc->check_w = 1;
 305                         break;
 306                 }
 307         }
 308 }
 309
 310 static int http_open(int port)
 311 {
 312         int ret;
 313
 314         server_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
 315         if (server_fd < 0) {
 316                 http_shutdown_clients();
 317                 self->status = SENDER_OFF;
 318                 return server_fd;
 319         }
 320         ret = mark_fd_nonblocking(server_fd);
 321         if (ret < 0) {
 322                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 323                 exit(EXIT_FAILURE);
 324         }
 325         self->status = SENDER_ON;
 326         add_close_on_fork_list(server_fd);
 327         return 1;
 328 }
 329
 330 static int http_com_on(__a_unused struct sender_command_data *scd)
 331 {
 332         if (self->status == SENDER_ON)
 333                 return 1;
 334         return http_open(conf.http_port_arg);
 335 }
 336
 337 static int http_com_off(__a_unused struct sender_command_data *scd)
 338 {
 339         self->status = SENDER_OFF;
 340         if (server_fd > 0) {
 341                 close(server_fd);
 342                 del_close_on_fork_list(server_fd);
 343                 server_fd = -1;
 344         }
 345         http_shutdown_clients();
 346         return 1;
 347 }
 348
 349 static int http_com_deny(struct sender_command_data *scd)
 350 {
 351         if (conf.http_default_deny_given)
 352                 acl_del_entry(&http_acl, scd->addr, scd->netmask);
 353         else
 354                 acl_add_entry(&http_acl, scd->addr, scd->netmask);
 355         return 1;
 356 }
 357
 358 static int http_com_allow(struct sender_command_data *scd)
 359 {
 360         if (conf.http_default_deny_given)
 361                 acl_add_entry(&http_acl, scd->addr, scd->netmask);
 362         else
 363                 acl_del_entry(&http_acl, scd->addr, scd->netmask);
 364         return 1;
 365 }
 366
 367 static char *http_info(void)
 368 {
 369         char *clnts = NULL, *ret;
 370         struct http_client *hc, *tmp_hc;
 371
 372         char *acl_contents = acl_get_contents(&http_acl);
 373         list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
 374                 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
 375                 free(clnts);
 376                 clnts = tmp;
 377         }
 378         ret = make_message(
 379                 "http status: %s\n"
 380                 "http tcp port: %d\n"
 381                 "http clients: %d\n"
 382                 "http maximal number of clients: %d%s\n"
 383                 "http connected clients: %s\n"
 384                 "http access %s list: %s\n",
 385                 (self->status == SENDER_ON)? "on" : "off",
 386                 conf.http_port_arg,
 387                 numclients,
 388                 conf.http_max_clients_arg,
 389                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 390                 clnts? clnts : "(none)",
 391                 conf.http_default_deny_given? "allow" : "deny",
 392                 acl_contents? acl_contents : "(none)"
 393         );
 394         free(acl_contents);
 395         free(clnts);
 396         return ret;
 397 }
 398
 399 static char *http_help(void)
 400 {
 401         return make_message(
 402                 "usage: {on|off}\n"
 403                 "usage: {allow|deny} IP mask\n"
 404                 "example: allow 127.0.0.1 32\n"
 405         );
 406 }
 407
 408 /**
 409  * The init function of the http sender.
 410  *
 411  * \param s Pointer to the http sender struct.
 412  *
 413  * It initializes all function pointers of \a s, the client list and the access
 414  * control list. If the autostart option was given, the tcp port is opened.
 415  */
 416 void http_send_init(struct sender *s)
 417 {
 418         INIT_LIST_HEAD(&clients);
 419         s->info = http_info;
 420         s->send = http_send;
 421         s->pre_select = http_pre_select;
 422         s->post_select = http_post_select;
 423         s->shutdown_clients = http_shutdown_clients;
 424         s->help = http_help;
 425         s->client_cmds[SENDER_ON] = http_com_on;
 426         s->client_cmds[SENDER_OFF] = http_com_off;
 427         s->client_cmds[SENDER_DENY] = http_com_deny;
 428         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 429         s->client_cmds[SENDER_ADD] = NULL;
 430         s->client_cmds[SENDER_DELETE] = NULL;
 431         self = s;
 432         acl_init(&http_acl, conf.http_access_arg, conf.http_access_given);
 433         if (!conf.http_no_autostart_given)
 434                 http_open(conf.http_port_arg); /* ignore errors */
 435         PARA_DEBUG_LOG("%s", "http sender init complete\n");
 436 }