25d9ac18cefdd5353909864aa6ec1001061d9170
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 is ready for sending audio data. */
43 /** We didn't receive a valid get request. */
44 HTTP_INVALID_GET_REQUEST
47 /** Clients will be kicked if there are more than that many bytes pending. */
48 #define MAX_BACKLOG 400000
49 /** The list of connected clients. */
50 static struct list_head clients
;
51 /** The whitelist/blacklist. */
52 static struct list_head http_acl
;
54 /** Describes one client that connected the tcp port of the http sender. */
56 /** The file descriptor of the client. */
58 /** The socket `name' of the client. */
60 /** The client's current status. */
61 enum http_status status
;
62 /** Non-zero if we included \a fd in the read set.*/
64 /** Non-zero if we included \a fd in the write set. */
66 /** The position of this client in the client list. */
67 struct list_head node
;
68 /** non-zero if audio file header has been sent */
70 /** The list of pending chunks for this client. */
71 struct chunk_queue
*cq
;
74 static int listen_fd
= -1, numclients
;
77 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
79 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc
->name
, hc
->fd
,
84 del_close_on_fork_list(hc
->fd
);
90 static void http_shutdown_clients(void)
92 struct http_client
*hc
, *tmp
;
93 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
94 http_shutdown_client(hc
, "vss request");
97 static int http_send_msg(struct http_client
*hc
, const char *msg
)
99 int ret
= send_buffer(hc
->fd
, msg
);
102 http_shutdown_client(hc
, "send msg failed");
106 static void http_send_ok_msg(struct http_client
*hc
)
108 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
109 http_send_msg(hc
, HTTP_OK_MSG
);
112 static int http_send_err_msg(struct http_client
*hc
)
114 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
115 return http_send_msg(hc
, HTTP_ERR_MSG
);
119 * ret: Negative on errors, zero if nothing was written and write returned
120 * EAGAIN, number of bytes written else.
122 static int http_write(int fd
, const char *buf
, size_t len
)
126 while (written
< len
) {
127 int ret
= write(fd
, buf
+ written
, len
- written
);
128 if (ret
< 0 && errno
== EAGAIN
)
131 return -ERRNO_TO_PARA_ERROR(errno
);
138 static int send_queued_chunks(struct http_client
*hc
)
140 struct queued_chunk
*qc
;
141 while ((qc
= cq_peek(hc
->cq
))) {
145 cq_get(qc
, &buf
, &len
);
146 ret
= http_write(hc
->fd
, buf
, len
);
149 cq_update(hc
->cq
, ret
);
157 static int queue_chunk_or_shutdown(struct http_client
*hc
, long unsigned chunk_num
,
160 int ret
= cq_enqueue(hc
->cq
, chunk_num
, sent
);
162 http_shutdown_client(hc
, "queue error");
166 static void http_send(long unsigned current_chunk
,
167 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
169 struct http_client
*hc
, *tmp
;
172 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
173 if (hc
->status
!= HTTP_STREAMING
)
175 if (!hc
->header_sent
&& current_chunk
) {
177 char *hbuf
= vss_get_header(&hlen
);
178 if (hbuf
&& hlen
> 0) { /* need to send header */
179 PARA_INFO_LOG("queueing header: %zu\n", hlen
);
180 if (queue_chunk_or_shutdown(hc
, -1U, 0) < 0)
183 PARA_INFO_LOG("no need to queue header\n");
186 ret
= send_queued_chunks(hc
);
188 http_shutdown_client(hc
, "queue send error");
193 ret
= http_write(hc
->fd
, buf
, len
);
195 http_shutdown_client(hc
, "send error");
199 queue_chunk_or_shutdown(hc
, current_chunk
, ret
);
203 static void http_post_select(fd_set
*rfds
, fd_set
*wfds
)
206 struct http_client
*hc
, *tmp
;
211 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
213 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
214 switch (hc
->status
) {
215 case HTTP_STREAMING
: /* nothing to do */
217 case HTTP_CONNECTED
: /* need to recv get request */
218 if (hc
->check_r
&& FD_ISSET(hc
->fd
, rfds
)) {
219 if (recv_pattern(hc
->fd
, HTTP_GET_MSG
, MAXLINE
)
221 hc
->status
= HTTP_INVALID_GET_REQUEST
;
223 hc
->status
= HTTP_GOT_GET_REQUEST
;
225 "received get request\n");
229 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
230 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
231 hc
->status
= HTTP_SENT_OK_MSG
;
232 http_send_ok_msg(hc
);
235 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
236 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
237 if (http_send_err_msg(hc
) >= 0)
238 http_shutdown_client(hc
,
239 "invalid get request");
242 case HTTP_SENT_OK_MSG
: /* need to send header? */
243 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
))
244 hc
->status
= HTTP_STREAMING
;
248 if (!FD_ISSET(listen_fd
, rfds
))
250 hc
= para_calloc(sizeof(struct http_client
));
251 err_msg
= "accept error";
252 hc
->fd
= para_accept(listen_fd
, NULL
, 0);
255 hc
->name
= make_message("%s", remote_name(hc
->fd
));
256 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc
->name
, hc
->fd
);
257 if (conf
.http_max_clients_arg
> 0 && numclients
>=
258 conf
.http_max_clients_arg
) {
259 err_msg
= "server full";
262 match
= acl_lookup(hc
->fd
, &http_acl
);
263 PARA_DEBUG_LOG("acl lookup returned %d\n", match
);
264 if ((match
&& !conf
.http_default_deny_given
) ||
265 (!match
&& conf
.http_default_deny_given
)) {
266 err_msg
= "permission denied";
269 err_msg
= "failed to mark fd non-blocking";
270 if (mark_fd_nonblocking(hc
->fd
) < 0)
272 hc
->status
= HTTP_CONNECTED
;
273 hc
->cq
= cq_new(MAX_BACKLOG
);
275 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients
,
277 para_list_add(&hc
->node
, &clients
);
278 add_close_on_fork_list(hc
->fd
);
281 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
288 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
290 struct http_client
*hc
, *tmp
;
294 para_fd_set(listen_fd
, rfds
, max_fileno
);
295 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
296 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
299 switch (hc
->status
) {
302 case HTTP_CONNECTED
: /* need to recv get request */
303 para_fd_set(hc
->fd
, rfds
, max_fileno
);
306 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
307 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
308 para_fd_set(hc
->fd
, wfds
, max_fileno
);
311 case HTTP_SENT_OK_MSG
:
313 break; /* wait until server starts playing */
314 para_fd_set(hc
->fd
, wfds
, max_fileno
);
321 static int http_open(void)
325 listen_fd
= para_listen(AF_UNSPEC
, IPPROTO_TCP
, conf
.http_port_arg
);
328 ret
= mark_fd_nonblocking(listen_fd
);
330 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
333 add_close_on_fork_list(listen_fd
);
337 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
344 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
348 PARA_NOTICE_LOG("closing http port %d\n", conf
.http_port_arg
);
350 del_close_on_fork_list(listen_fd
);
351 http_shutdown_clients();
356 static int http_com_deny(struct sender_command_data
*scd
)
358 if (conf
.http_default_deny_given
)
359 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
361 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
365 static int http_com_allow(struct sender_command_data
*scd
)
367 if (conf
.http_default_deny_given
)
368 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
370 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
374 static char *http_info(void)
376 char *clnts
= NULL
, *ret
;
377 struct http_client
*hc
, *tmp_hc
;
379 char *acl_contents
= acl_get_contents(&http_acl
);
380 list_for_each_entry_safe(hc
, tmp_hc
, &clients
, node
) {
381 char *tmp
= make_message("%s%s ", clnts
? clnts
: "", hc
->name
);
387 "http tcp port: %d\n"
389 "http maximal number of clients: %d%s\n"
390 "http connected clients: %s\n"
391 "http access %s list: %s\n",
392 (listen_fd
>= 0)? "on" : "off",
395 conf
.http_max_clients_arg
,
396 conf
.http_max_clients_arg
> 0? "" : " (unlimited)",
397 clnts
? clnts
: "(none)",
398 conf
.http_default_deny_given
? "allow" : "deny",
399 acl_contents
? acl_contents
: "(none)"
406 static char *http_help(void)
410 "usage: {allow|deny} IP mask\n"
411 "example: allow 127.0.0.1 32\n"
416 * The init function of the http sender.
418 * \param s Pointer to the http sender struct.
420 * It initializes all function pointers of \a s, the client list and the access
421 * control list. If the autostart option was given, the tcp port is opened.
423 void http_send_init(struct sender
*s
)
425 INIT_LIST_HEAD(&clients
);
428 s
->pre_select
= http_pre_select
;
429 s
->post_select
= http_post_select
;
430 s
->shutdown_clients
= http_shutdown_clients
;
432 s
->client_cmds
[SENDER_ON
] = http_com_on
;
433 s
->client_cmds
[SENDER_OFF
] = http_com_off
;
434 s
->client_cmds
[SENDER_DENY
] = http_com_deny
;
435 s
->client_cmds
[SENDER_ALLOW
] = http_com_allow
;
436 s
->client_cmds
[SENDER_ADD
] = NULL
;
437 s
->client_cmds
[SENDER_DELETE
] = NULL
;
438 acl_init(&http_acl
, conf
.http_access_arg
, conf
.http_access_given
);
439 if (!conf
.http_no_autostart_given
)
440 http_open(); /* ignore errors */
441 PARA_DEBUG_LOG("%s", "http sender init complete\n");