2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 /** \file http_send.c paraslash's http sender */
22 #include "server.cmdline.h"
28 #include "close_on_fork.h"
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"
40 extern struct gengetopt_args_info conf
;
42 /** the possible states of a client from the server's POV */
49 HTTP_INVALID_GET_REQUEST
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
;
59 /** describes one client that connected the tcp port of the http sender */
61 /** the file descriptor of the client */
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 */
69 /** non-zero if we included \a fd in the write set */
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
;
80 * describes one queued data packet for a client
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.
86 struct queued_packet
{
87 /** the length of the packet in bytes */
89 /** pointer to the packet data */
91 /** position of the packet in the packet list */
92 struct list_head node
;
96 * describes one entry in the blacklist/whitelist of the http sender
99 /** the address to be black/whitelisted */
101 /** the netmask for this entry */
103 /** the position of this entry in the access_perm_list */
104 struct list_head node
;
107 static int server_fd
= -1, numclients
;
108 static struct sender
*self
;
111 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
113 struct queued_packet
*qp
, *tmp
;
114 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc
),
119 list_for_each_entry_safe(qp
, tmp
, &hc
->packet_queue
, node
) {
129 static void http_shutdown_clients_real(void)
131 struct http_client
*hc
, *tmp
;
132 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
133 http_shutdown_client(hc
, "afs request");
135 static void http_shutdown_clients(void)
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");
143 static int http_send_msg(struct http_client
*hc
, const char *msg
)
145 int ret
= send_buffer(hc
->fd
, msg
);
148 http_shutdown_client(hc
, "send msg failed");
152 static void http_send_ok_msg(struct http_client
*hc
)
154 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
155 http_send_msg(hc
, HTTP_OK_MSG
);
158 static int http_send_err_msg(struct http_client
*hc
)
160 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
161 return http_send_msg(hc
, HTTP_ERR_MSG
);
164 static int queue_packet(struct http_client
*hc
, const char *buf
, size_t len
)
166 struct queued_packet
*qp
;
167 if (hc
->pq_bytes
+ len
> MAX_BACKLOG
) {
168 http_shutdown_client(hc
, "packet queue overrun");
171 qp
= para_malloc(sizeof(struct queued_packet
));
173 qp
->packet
= para_malloc(len
);
174 memcpy(qp
->packet
, buf
, 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
);
181 static int send_queued_packets(struct http_client
*hc
)
184 struct queued_packet
*qp
, *tmp
;
186 if (list_empty(&hc
->packet_queue
))
188 list_for_each_entry_safe(qp
, tmp
, &hc
->packet_queue
, node
) {
189 ret
= write_ok(hc
->fd
);
191 return ret
? -E_WRITE_OK
: 0;
192 ret
= write(hc
->fd
, qp
->packet
, qp
->len
);
195 if (ret
!= qp
->len
) {
197 memmove(qp
->packet
, qp
->packet
+ ret
, qp
->len
);
200 hc
->pq_bytes
-= qp
->len
;
208 static void http_send(__a_unused
struct audio_format
*af
,
209 long unsigned current_chunk
,
210 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
212 struct http_client
*hc
, *tmp
;
215 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
216 if (hc
->status
!= HTTP_STREAMING
&&
217 hc
->status
!= HTTP_READY_TO_STREAM
)
219 if (hc
->status
== HTTP_READY_TO_STREAM
) {
220 if (af
->get_header_info
&& current_chunk
) {
221 /* need to send header */
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)
230 PARA_INFO_LOG("%s", "no need to queue header\n");
231 hc
->status
= HTTP_STREAMING
;
233 ret
= send_queued_packets(hc
);
235 http_shutdown_client(hc
, "send error");
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
,
244 queue_packet(hc
, buf
, len
);
247 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
248 ret
= write(hc
->fd
, buf
, len
);
250 http_shutdown_client(hc
, "send error");
254 queue_packet(hc
, buf
+ ret
, len
- ret
);
258 static int host_in_access_perm_list(struct http_client
*hc
)
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
))
269 static void http_post_select(__a_unused
struct audio_format
*af
, fd_set
*rfds
,
273 struct http_client
*hc
, *tmp
;
276 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
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
:
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
)
287 hc
->status
= HTTP_INVALID_GET_REQUEST
;
289 hc
->status
= HTTP_GOT_GET_REQUEST
;
291 "received get request\n");
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
);
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");
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
;
314 if (!FD_ISSET(server_fd
, rfds
))
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
));
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";
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";
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
);
339 list_add(&hc
->node
, &clients
);
342 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
343 CLIENT_ADDR(hc
), err_msg
);
349 static void http_pre_select(struct audio_format
*af
, int *max_fileno
, fd_set
*rfds
,
352 struct http_client
*hc
, *tmp
;
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);
362 switch (hc
->status
) {
364 case HTTP_READY_TO_STREAM
:
366 case HTTP_CONNECTED
: /* need to recv get request */
367 FD_SET(hc
->fd
, rfds
);
368 *max_fileno
= MAX(*max_fileno
, hc
->fd
);
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
);
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
);
388 static int open_tcp_port(int port
)
390 server_fd
= init_tcp_socket(port
);
392 http_shutdown_clients_real();
393 self
->status
= SENDER_OFF
;
396 self
->status
= SENDER_ON
;
397 add_close_on_fork_list(server_fd
);
401 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
403 if (self
->status
== SENDER_ON
)
405 return open_tcp_port(conf
.http_port_arg
);
408 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
410 self
->status
= SENDER_OFF
;
413 del_close_on_fork_list(server_fd
);
416 http_shutdown_clients_real();
420 static void del_perm_list_entry(struct sender_command_data
*scd
)
422 struct access_info
*ai
, *tmp
;
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",
437 static void add_perm_list_entry(struct sender_command_data
*scd
)
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
),
444 list_add(&ai
->node
, &access_perm_list
);
447 static int http_com_deny(struct sender_command_data
*scd
)
449 if (conf
.http_default_deny_given
)
450 del_perm_list_entry(scd
);
452 add_perm_list_entry(scd
);
456 static int http_com_allow(struct sender_command_data
*scd
)
458 if (conf
.http_default_deny_given
)
459 add_perm_list_entry(scd
);
461 del_perm_list_entry(scd
);
465 static char *http_info(void)
467 char *clnts
= NULL
, *ap
= NULL
, *ret
;
468 struct access_info
*ai
, *tmp_ai
;
469 struct http_client
*hc
, *tmp_hc
;
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
);
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
));
485 "http tcp port: %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",
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",
504 static void init_access_control_list(void)
507 struct sender_command_data scd
;
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
, '/');
516 if (!inet_aton(arg
, &scd
.addr
))
518 scd
.netmask
= atoi(++p
);
519 if (scd
.netmask
< 0 || scd
.netmask
> 32)
521 add_perm_list_entry(&scd
);
524 PARA_CRIT_LOG("syntax error for http_access option "
525 "#%d, ignoring\n", i
);
532 static char *http_help(void)
536 "usage: {allow|deny} IP mask\n"
537 "example: allow 127.0.0.1 32\n"
542 * the init function of the http sender
544 * \param s pointer to the http sender struct
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.
549 void http_send_init(struct sender
*s
)
551 INIT_LIST_HEAD(&clients
);
554 s
->pre_select
= http_pre_select
;
555 s
->post_select
= http_post_select
;
556 s
->shutdown_clients
= http_shutdown_clients
;
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
;
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");