2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file http_send.c paraslash's http sender */
15 #include "server.cmdline.h"
23 #include "close_on_fork.h"
26 #include "chunk_queue.h"
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"
35 /** The possible states of a client from the server's POV. */
37 /** We accepted the connection on the tcp socket. */
39 /** Successfully received the get request. */
41 /** We sent the OK message back to the client. */
43 /** Connection established, we might need to send the audio file header. */
45 /** Connection is ready for sending audio data. */
47 /** We didn't receive a valid get request. */
48 HTTP_INVALID_GET_REQUEST
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
;
58 /** Describes one client that connected the tcp port of the http sender. */
60 /** The file descriptor of the client. */
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.*/
68 /** Non-zero if we included \a fd in the write set. */
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
;
77 * Describes one entry in the blacklist/whitelist of the http sender.
80 /** The address to be black/whitelisted. */
82 /** The netmask for this entry. */
84 /** The position of this entry in the access_perm_list. */
85 struct list_head node
;
88 static int server_fd
= -1, numclients
;
89 static struct sender
*self
;
92 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
94 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc
),
98 del_close_on_fork_list(hc
->fd
);
104 static void http_shutdown_clients(void)
106 struct http_client
*hc
, *tmp
;
107 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
108 http_shutdown_client(hc
, "vss request");
111 static int http_send_msg(struct http_client
*hc
, const char *msg
)
113 int ret
= send_buffer(hc
->fd
, msg
);
116 http_shutdown_client(hc
, "send msg failed");
120 static void http_send_ok_msg(struct http_client
*hc
)
122 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
123 http_send_msg(hc
, HTTP_OK_MSG
);
126 static int http_send_err_msg(struct http_client
*hc
)
128 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
129 return http_send_msg(hc
, HTTP_ERR_MSG
);
132 static int send_queued_chunks(struct http_client
*hc
)
134 struct queued_chunk
*qc
;
135 while ((qc
= cq_peek(hc
->cq
))) {
138 int ret
= write_ok(hc
->fd
);
140 return ret
? -E_WRITE_OK
: 0;
141 cq_get(qc
, &buf
, &len
);
142 ret
= write(hc
->fd
, buf
, len
);
144 return -E_SEND_QUEUED_CHUNK
;
145 cq_update(hc
->cq
, ret
);
153 static int queue_chunk_or_shutdown(struct http_client
*hc
, long unsigned chunk_num
,
156 int ret
= cq_enqueue(hc
->cq
, chunk_num
, sent
);
158 http_shutdown_client(hc
, "queue error");
162 static void http_send( long unsigned current_chunk
,
163 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
165 struct http_client
*hc
, *tmp
;
168 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
169 if (hc
->status
!= HTTP_STREAMING
&&
170 hc
->status
!= HTTP_READY_TO_STREAM
)
172 if (hc
->status
== HTTP_READY_TO_STREAM
) {
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)
181 PARA_INFO_LOG("no need to queue header\n");
182 hc
->status
= HTTP_STREAMING
;
184 ret
= send_queued_chunks(hc
);
186 http_shutdown_client(hc
, "queue send error");
191 if (!ret
|| write_ok(hc
->fd
) <= 0) {
192 queue_chunk_or_shutdown(hc
, current_chunk
, 0);
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);
199 http_shutdown_client(hc
, "send error");
203 queue_chunk_or_shutdown(hc
, current_chunk
, ret
);
207 static int host_in_access_perm_list(struct http_client
*hc
)
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
))
218 static void http_post_select(fd_set
*rfds
, fd_set
*wfds
)
221 struct http_client
*hc
, *tmp
;
224 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
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
:
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
)
235 hc
->status
= HTTP_INVALID_GET_REQUEST
;
237 hc
->status
= HTTP_GOT_GET_REQUEST
;
239 "received get request\n");
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
);
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");
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
;
262 if (!FD_ISSET(server_fd
, rfds
))
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
));
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";
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";
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
);
287 para_list_add(&hc
->node
, &clients
);
288 add_close_on_fork_list(hc
->fd
);
289 mark_fd_nonblock(hc
->fd
);
292 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
293 CLIENT_ADDR(hc
), err_msg
);
299 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
301 struct http_client
*hc
, *tmp
;
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);
310 switch (hc
->status
) {
312 case HTTP_READY_TO_STREAM
:
314 case HTTP_CONNECTED
: /* need to recv get request */
315 para_fd_set(hc
->fd
, rfds
, max_fileno
);
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
);
323 case HTTP_SENT_OK_MSG
:
325 break; /* wait until server starts playing */
326 para_fd_set(hc
->fd
, wfds
, max_fileno
);
333 static int open_tcp_port(int port
)
337 server_fd
= init_tcp_socket(port
);
339 http_shutdown_clients();
340 self
->status
= SENDER_OFF
;
343 ret
= mark_fd_nonblock(server_fd
);
345 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
348 self
->status
= SENDER_ON
;
349 add_close_on_fork_list(server_fd
);
353 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
355 if (self
->status
== SENDER_ON
)
357 return open_tcp_port(conf
.http_port_arg
);
360 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
362 self
->status
= SENDER_OFF
;
365 del_close_on_fork_list(server_fd
);
368 http_shutdown_clients();
372 static void del_perm_list_entry(struct sender_command_data
*scd
)
374 struct access_info
*ai
, *tmp
;
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",
389 static void add_perm_list_entry(struct sender_command_data
*scd
)
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
),
396 para_list_add(&ai
->node
, &access_perm_list
);
399 static int http_com_deny(struct sender_command_data
*scd
)
401 if (conf
.http_default_deny_given
)
402 del_perm_list_entry(scd
);
404 add_perm_list_entry(scd
);
408 static int http_com_allow(struct sender_command_data
*scd
)
410 if (conf
.http_default_deny_given
)
411 add_perm_list_entry(scd
);
413 del_perm_list_entry(scd
);
417 static char *http_info(void)
419 char *clnts
= NULL
, *ap
= NULL
, *ret
;
420 struct access_info
*ai
, *tmp_ai
;
421 struct http_client
*hc
, *tmp_hc
;
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
);
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
));
437 "http tcp port: %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",
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",
456 static void init_access_control_list(void)
459 struct sender_command_data scd
;
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
, '/');
468 if (!inet_pton(AF_INET
, arg
, &scd
.addr
))
470 scd
.netmask
= atoi(++p
);
471 if (scd
.netmask
< 0 || scd
.netmask
> 32)
473 add_perm_list_entry(&scd
);
476 PARA_CRIT_LOG("syntax error for http_access option "
477 "#%d, ignoring\n", i
);
484 static char *http_help(void)
488 "usage: {allow|deny} IP mask\n"
489 "example: allow 127.0.0.1 32\n"
494 * The init function of the http sender.
496 * \param s Pointer to the http sender struct.
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.
501 void http_send_init(struct sender
*s
)
503 INIT_LIST_HEAD(&clients
);
506 s
->pre_select
= http_pre_select
;
507 s
->post_select
= http_post_select
;
508 s
->shutdown_clients
= http_shutdown_clients
;
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
;
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");