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 /** Connection is ready for sending audio data. */
41 /** We didn't receive a valid get request. */
42 HTTP_INVALID_GET_REQUEST
45 /** Clients will be kicked if there are more than that many bytes pending. */
46 #define MAX_BACKLOG 400000
47 /** The list of connected clients. */
48 static struct list_head clients
;
49 /** The whitelist/blacklist. */
50 static struct list_head http_acl
;
52 /** Describes one client that connected the tcp port of the http sender. */
54 /** The file descriptor of the client. */
56 /** The socket `name' of the client. */
58 /** The client's current status. */
59 enum http_status status
;
60 /** Non-zero if we included \a fd in the read set.*/
62 /** Non-zero if we included \a fd in the write set. */
64 /** The position of this client in the client list. */
65 struct list_head node
;
66 /** non-zero if audio file header has been sent */
68 /** The list of pending chunks for this client. */
69 struct chunk_queue
*cq
;
72 static int listen_fd
= -1, numclients
;
75 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
77 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc
->name
, hc
->fd
,
82 del_close_on_fork_list(hc
->fd
);
88 static void http_shutdown_clients(void)
90 struct http_client
*hc
, *tmp
;
91 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
92 http_shutdown_client(hc
, "vss request");
95 static int http_send_msg(struct http_client
*hc
, const char *msg
)
97 int ret
= send_buffer(hc
->fd
, msg
);
100 http_shutdown_client(hc
, "send msg failed");
104 static void http_send_ok_msg(struct http_client
*hc
)
106 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
107 http_send_msg(hc
, HTTP_OK_MSG
);
110 static int http_send_err_msg(struct http_client
*hc
)
112 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
113 return http_send_msg(hc
, HTTP_ERR_MSG
);
117 * ret: Negative on errors, zero if nothing was written and write returned
118 * EAGAIN, number of bytes written else.
120 static int http_write(int fd
, const char *buf
, size_t len
)
124 while (written
< len
) {
125 int ret
= write(fd
, buf
+ written
, len
- written
);
126 if (ret
< 0 && errno
== EAGAIN
)
129 return -ERRNO_TO_PARA_ERROR(errno
);
136 static int send_queued_chunks(struct http_client
*hc
)
138 struct queued_chunk
*qc
;
139 while ((qc
= cq_peek(hc
->cq
))) {
143 cq_get(qc
, &buf
, &len
);
144 ret
= http_write(hc
->fd
, buf
, len
);
147 cq_update(hc
->cq
, ret
);
155 static int queue_chunk_or_shutdown(struct http_client
*hc
, long unsigned chunk_num
,
158 int ret
= cq_enqueue(hc
->cq
, chunk_num
, sent
);
160 http_shutdown_client(hc
, "queue error");
164 static void http_send(long unsigned current_chunk
,
165 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
167 struct http_client
*hc
, *tmp
;
170 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
171 if (hc
->status
!= HTTP_STREAMING
)
173 if (!hc
->header_sent
&& current_chunk
) {
175 char *hbuf
= vss_get_header(&hlen
);
176 if (hbuf
&& hlen
> 0) { /* 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");
184 ret
= send_queued_chunks(hc
);
186 http_shutdown_client(hc
, "queue send error");
191 ret
= http_write(hc
->fd
, buf
, len
);
193 http_shutdown_client(hc
, "send error");
197 queue_chunk_or_shutdown(hc
, current_chunk
, ret
);
201 static void http_post_select(fd_set
*rfds
, fd_set
*wfds
)
204 struct http_client
*hc
, *tmp
;
209 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
211 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
212 switch (hc
->status
) {
213 case HTTP_STREAMING
: /* nothing to do */
215 case HTTP_CONNECTED
: /* need to recv get request */
216 if (hc
->check_r
&& FD_ISSET(hc
->fd
, rfds
)) {
217 if (recv_pattern(hc
->fd
, HTTP_GET_MSG
, MAXLINE
)
219 hc
->status
= HTTP_INVALID_GET_REQUEST
;
221 hc
->status
= HTTP_GOT_GET_REQUEST
;
223 "received get request\n");
227 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
228 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
229 hc
->status
= HTTP_STREAMING
;
230 http_send_ok_msg(hc
);
233 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
234 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
235 if (http_send_err_msg(hc
) >= 0)
236 http_shutdown_client(hc
,
237 "invalid get request");
242 if (!FD_ISSET(listen_fd
, rfds
))
244 hc
= para_calloc(sizeof(struct http_client
));
245 err_msg
= "accept error";
246 hc
->fd
= para_accept(listen_fd
, NULL
, 0);
249 hc
->name
= make_message("%s", remote_name(hc
->fd
));
250 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc
->name
, hc
->fd
);
251 if (conf
.http_max_clients_arg
> 0 && numclients
>=
252 conf
.http_max_clients_arg
) {
253 err_msg
= "server full";
256 match
= acl_lookup(hc
->fd
, &http_acl
);
257 PARA_DEBUG_LOG("acl lookup returned %d\n", match
);
258 if ((match
&& !conf
.http_default_deny_given
) ||
259 (!match
&& conf
.http_default_deny_given
)) {
260 err_msg
= "permission denied";
263 err_msg
= "failed to mark fd non-blocking";
264 if (mark_fd_nonblocking(hc
->fd
) < 0)
266 hc
->status
= HTTP_CONNECTED
;
267 hc
->cq
= cq_new(MAX_BACKLOG
);
269 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients
,
271 para_list_add(&hc
->node
, &clients
);
272 add_close_on_fork_list(hc
->fd
);
275 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
282 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
284 struct http_client
*hc
, *tmp
;
288 para_fd_set(listen_fd
, rfds
, max_fileno
);
289 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
290 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
293 switch (hc
->status
) {
296 case HTTP_CONNECTED
: /* need to recv get request */
297 para_fd_set(hc
->fd
, rfds
, max_fileno
);
300 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
301 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
302 para_fd_set(hc
->fd
, wfds
, max_fileno
);
309 static int http_open(void)
313 listen_fd
= para_listen(AF_UNSPEC
, IPPROTO_TCP
, conf
.http_port_arg
);
316 ret
= mark_fd_nonblocking(listen_fd
);
318 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
321 add_close_on_fork_list(listen_fd
);
325 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
332 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
336 PARA_NOTICE_LOG("closing http port %d\n", conf
.http_port_arg
);
338 del_close_on_fork_list(listen_fd
);
339 http_shutdown_clients();
344 static int http_com_deny(struct sender_command_data
*scd
)
346 if (conf
.http_default_deny_given
)
347 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
349 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
353 static int http_com_allow(struct sender_command_data
*scd
)
355 if (conf
.http_default_deny_given
)
356 acl_add_entry(&http_acl
, scd
->addr
, scd
->netmask
);
358 acl_del_entry(&http_acl
, scd
->addr
, scd
->netmask
);
362 static char *http_info(void)
364 char *clnts
= NULL
, *ret
;
365 struct http_client
*hc
, *tmp_hc
;
367 char *acl_contents
= acl_get_contents(&http_acl
);
368 list_for_each_entry_safe(hc
, tmp_hc
, &clients
, node
) {
369 char *tmp
= make_message("%s%s ", clnts
? clnts
: "", hc
->name
);
375 "http tcp port: %d\n"
377 "http maximal number of clients: %d%s\n"
378 "http connected clients: %s\n"
379 "http access %s list: %s\n",
380 (listen_fd
>= 0)? "on" : "off",
383 conf
.http_max_clients_arg
,
384 conf
.http_max_clients_arg
> 0? "" : " (unlimited)",
385 clnts
? clnts
: "(none)",
386 conf
.http_default_deny_given
? "allow" : "deny",
387 acl_contents
? acl_contents
: "(none)"
394 static char *http_help(void)
398 "usage: {allow|deny} IP mask\n"
399 "example: allow 127.0.0.1 32\n"
404 * The init function of the http sender.
406 * \param s Pointer to the http sender struct.
408 * It initializes all function pointers of \a s, the client list and the access
409 * control list. If the autostart option was given, the tcp port is opened.
411 void http_send_init(struct sender
*s
)
413 INIT_LIST_HEAD(&clients
);
416 s
->pre_select
= http_pre_select
;
417 s
->post_select
= http_post_select
;
418 s
->shutdown_clients
= http_shutdown_clients
;
420 s
->client_cmds
[SENDER_ON
] = http_com_on
;
421 s
->client_cmds
[SENDER_OFF
] = http_com_off
;
422 s
->client_cmds
[SENDER_DENY
] = http_com_deny
;
423 s
->client_cmds
[SENDER_ALLOW
] = http_com_allow
;
424 s
->client_cmds
[SENDER_ADD
] = NULL
;
425 s
->client_cmds
[SENDER_DELETE
] = NULL
;
426 acl_init(&http_acl
, conf
.http_access_arg
, conf
.http_access_given
);
427 if (!conf
.http_no_autostart_given
)
428 http_open(); /* ignore errors */
429 PARA_DEBUG_LOG("%s", "http sender init complete\n");