2 * Copyright (C) 2005-2008 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"
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"
33 /** The possible states of a client from the server's POV. */
35 /** We accepted the connection on the tcp socket. */
37 /** Successfully received the get request. */
39 /** We sent the OK message back to the client. */
41 /** Connection established, we might need to send the audio file header. */
43 /** Connection is ready for sending audio data. */
45 /** We didn't receive a valid get request. */
46 HTTP_INVALID_GET_REQUEST
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
;
56 /** Describes one client that connected the tcp port of the http sender. */
58 /** The file descriptor of the client. */
60 /** The socket `name' of the client. */
62 /** The client's current status. */
63 enum http_status status
;
64 /** Non-zero if we included \a fd in the read set.*/
66 /** Non-zero if we included \a fd in the write set. */
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
;
74 static int listen_fd
= -1, numclients
;
75 static struct sender
*self
;
78 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
80 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc
->name
, hc
->fd
,
85 del_close_on_fork_list(hc
->fd
);
91 static void http_shutdown_clients(void)
93 struct http_client
*hc
, *tmp
;
94 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
95 http_shutdown_client(hc
, "vss request");
98 static int http_send_msg(struct http_client
*hc
, const char *msg
)
100 int ret
= send_buffer(hc
->fd
, msg
);
103 http_shutdown_client(hc
, "send msg failed");
107 static void http_send_ok_msg(struct http_client
*hc
)
109 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
110 http_send_msg(hc
, HTTP_OK_MSG
);
113 static int http_send_err_msg(struct http_client
*hc
)
115 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
116 return http_send_msg(hc
, HTTP_ERR_MSG
);
119 static int send_queued_chunks(struct http_client
*hc
)
121 struct queued_chunk
*qc
;
122 while ((qc
= cq_peek(hc
->cq
))) {
125 int ret
= write_ok(hc
->fd
);
127 return ret
? -E_WRITE_OK
: 0;
128 cq_get(qc
, &buf
, &len
);
129 ret
= write(hc
->fd
, buf
, len
);
131 return -E_SEND_QUEUED_CHUNK
;
132 cq_update(hc
->cq
, ret
);
140 static int queue_chunk_or_shutdown(struct http_client
*hc
, long unsigned chunk_num
,
143 int ret
= cq_enqueue(hc
->cq
, chunk_num
, sent
);
145 http_shutdown_client(hc
, "queue error");
149 static void http_send( long unsigned current_chunk
,
150 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
152 struct http_client
*hc
, *tmp
;
155 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
156 if (hc
->status
!= HTTP_STREAMING
&&
157 hc
->status
!= HTTP_READY_TO_STREAM
)
159 if (hc
->status
== HTTP_READY_TO_STREAM
) {
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)
168 PARA_INFO_LOG("no need to queue header\n");
169 hc
->status
= HTTP_STREAMING
;
171 ret
= send_queued_chunks(hc
);
173 http_shutdown_client(hc
, "queue send error");
178 if (!ret
|| write_ok(hc
->fd
) <= 0) {
179 queue_chunk_or_shutdown(hc
, current_chunk
, 0);
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);
186 http_shutdown_client(hc
, "send error");
190 queue_chunk_or_shutdown(hc
, current_chunk
, ret
);
194 static void http_post_select(fd_set
*rfds
, fd_set
*wfds
)
197 struct http_client
*hc
, *tmp
;
202 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
204 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
205 switch (hc
->status
) {
206 case HTTP_STREAMING
: /* nothing to do */
207 case HTTP_READY_TO_STREAM
:
209 case HTTP_CONNECTED
: /* need to recv get request */
210 if (hc
->check_r
&& FD_ISSET(hc
->fd
, rfds
)) {
211 if (recv_pattern(hc
->fd
, HTTP_GET_MSG
, MAXLINE
)
213 hc
->status
= HTTP_INVALID_GET_REQUEST
;
215 hc
->status
= HTTP_GOT_GET_REQUEST
;
217 "received get request\n");
221 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
222 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
223 hc
->status
= HTTP_SENT_OK_MSG
;
224 http_send_ok_msg(hc
);
227 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
228 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
229 if (http_send_err_msg(hc
) >= 0)
230 http_shutdown_client(hc
,
231 "invalid get request");
234 case HTTP_SENT_OK_MSG
: /* need to send header? */
235 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
))
236 hc
->status
= HTTP_READY_TO_STREAM
;
240 if (!FD_ISSET(listen_fd
, rfds
))
242 hc
= para_calloc(sizeof(struct http_client
));
243 err_msg
= "accept error";
244 hc
->fd
= para_accept(listen_fd
, NULL
, 0);
247 hc
->name
= make_message("%s", remote_name(hc
->fd
));
248 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc
->name
, hc
->fd
);
249 if (conf
.http_max_clients_arg
> 0 && numclients
>=
250 conf
.http_max_clients_arg
) {
251 err_msg
= "server full";
254 match
= acl_lookup(hc
->fd
, &http_acl
);
255 PARA_DEBUG_LOG("acl lookup returned %d\n", match
);
256 if ((match
&& !conf
.http_default_deny_given
) ||
257 (!match
&& conf
.http_default_deny_given
)) {
258 err_msg
= "permission denied";
261 hc
->status
= HTTP_CONNECTED
;
262 hc
->cq
= cq_new(MAX_BACKLOG
);
264 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients
,
266 para_list_add(&hc
->node
, &clients
);
267 add_close_on_fork_list(hc
->fd
);
268 mark_fd_nonblocking(hc
->fd
);
271 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
278 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
280 struct http_client
*hc
, *tmp
;
284 para_fd_set(listen_fd
, rfds
, max_fileno
);
285 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
286 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
289 switch (hc
->status
) {
291 case HTTP_READY_TO_STREAM
:
293 case HTTP_CONNECTED
: /* need to recv get request */
294 para_fd_set(hc
->fd
, rfds
, max_fileno
);
297 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
298 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
299 para_fd_set(hc
->fd
, wfds
, max_fileno
);
302 case HTTP_SENT_OK_MSG
:
304 break; /* wait until server starts playing */
305 para_fd_set(hc
->fd
, wfds
, max_fileno
);
312 static int http_open(int port
)
316 listen_fd
= para_listen(AF_UNSPEC
, IPPROTO_TCP
, port
);
318 http_shutdown_clients();
321 ret
= mark_fd_nonblocking(listen_fd
);
323 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
326 add_close_on_fork_list(listen_fd
);
330 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
334 return http_open(conf
.http_port_arg
);
337 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
341 PARA_NOTICE_LOG("closing http port %d\n", conf
.http_port_arg
);
343 del_close_on_fork_list(listen_fd
);
344 http_shutdown_clients();
349 static int http_com_deny(struct sender_command_data
*scd
)
351 if (conf
.http_default_deny_given
)
352 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
354 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
358 static int http_com_allow(struct sender_command_data
*scd
)
360 if (conf
.http_default_deny_given
)
361 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
363 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
367 static char *http_info(void)
369 char *clnts
= NULL
, *ret
;
370 struct http_client
*hc
, *tmp_hc
;
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
);
380 "http tcp port: %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 (listen_fd
>= 0)? "on" : "off",
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)"
399 static char *http_help(void)
403 "usage: {allow|deny} IP mask\n"
404 "example: allow 127.0.0.1 32\n"
409 * The init function of the http sender.
411 * \param s Pointer to the http sender struct.
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.
416 void http_send_init(struct sender
*s
)
418 INIT_LIST_HEAD(&clients
);
421 s
->pre_select
= http_pre_select
;
422 s
->post_select
= http_post_select
;
423 s
->shutdown_clients
= http_shutdown_clients
;
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
;
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");