1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file http_send.c paraslash's http sender */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
14 #include "server.lsg.h"
26 #include "close_on_fork.h"
28 #include "chunk_queue.h"
30 /** Message sent to clients that do not send a valid get request. */
31 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
33 /** The possible states of a client from the server's POV. */
34 enum http_client_status
{
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 /** For each connected client, a structure of this type is maintained. */
46 struct private_http_sender_data
{
47 /** The current state of this client. */
48 enum http_client_status status
;
51 static struct sender_status http_sender_status
, *hss
= &http_sender_status
;
53 static int http_send_msg(struct sender_client
*sc
, const char *msg
)
55 int ret
= write_buffer(sc
->fd
, msg
);
58 shutdown_client(sc
, hss
);
62 static void http_send_ok_msg(struct sender_client
*sc
)
64 PARA_INFO_LOG("sending http ok message to fd %d\n", sc
->fd
);
65 http_send_msg(sc
, HTTP_OK_MSG
);
68 static int http_send_err_msg(struct sender_client
*sc
)
70 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc
->fd
);
71 return http_send_msg(sc
, HTTP_ERR_MSG
);
74 static void http_shutdown_clients(void)
76 shutdown_clients(hss
);
79 static void http_shutdown(void)
81 http_shutdown_clients();
82 generic_acl_deplete(&hss
->acl
);
83 free_sender_status(hss
);
86 static int queue_chunk_or_shutdown(struct sender_client
*sc
,
87 struct sender_status
*ss
, const char *buf
, size_t num_bytes
)
89 int ret
= cq_enqueue(sc
->cq
, buf
, num_bytes
);
91 shutdown_client(sc
, ss
);
96 * Send one chunk of audio data to a connected client.
98 * \param sc The client.
99 * \param ss The sender.
100 * \param current_chunk The number of the chunk to write.
101 * \param buf The data to write.
102 * \param len The number of bytes of \a buf.
103 * \param header_buf The audio file header.
104 * \param header_len The number of bytes of \a header_buf.
106 * On errors, the client is shut down. If only a part of the buffer could be
107 * written, the remainder is put into the chunk queue for that client.
109 static void http_send_chunk(struct sender_client
*sc
, struct sender_status
*ss
,
110 long unsigned current_chunk
, const char *buf
, size_t len
,
111 const char *header_buf
, size_t header_len
)
115 if (!sc
->header_sent
&& current_chunk
) {
116 if (header_buf
&& header_len
> 0) {
117 ret
= queue_chunk_or_shutdown(sc
, ss
, header_buf
, header_len
);
123 ret
= send_queued_chunks(sc
->fd
, sc
->cq
);
125 shutdown_client(sc
, ss
);
130 if (!ret
) { /* still data left in the queue */
131 ret
= queue_chunk_or_shutdown(sc
, ss
, buf
, len
);
134 ret
= xwrite(sc
->fd
, buf
, len
);
136 shutdown_client(sc
, ss
);
140 ret
= queue_chunk_or_shutdown(sc
, ss
, buf
+ ret
, len
- ret
);
143 PARA_NOTICE_LOG("%s\n", para_strerror(-ret
));
146 static void http_send(long unsigned current_chunk
,
147 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
,
148 const char *header_buf
, size_t header_len
)
150 struct sender_client
*sc
, *tmp
;
152 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
153 struct private_http_sender_data
*phsd
= sc
->private_data
;
155 if (phsd
->status
== HTTP_STREAMING
)
156 http_send_chunk(sc
, hss
, current_chunk
, buf
, len
,
157 header_buf
, header_len
);
161 static void http_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
163 struct sender_client
*sc
, *tmp
;
164 struct private_http_sender_data
*phsd
;
167 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
168 phsd
= sc
->private_data
;
169 switch (phsd
->status
) {
170 case HTTP_STREAMING
: /* nothing to do */
172 case HTTP_CONNECTED
: /* need to recv get request */
173 ret
= read_pattern(sc
->fd
, HTTP_GET_MSG
, MAXLINE
, rfds
);
175 phsd
->status
= HTTP_INVALID_GET_REQUEST
;
177 phsd
->status
= HTTP_GOT_GET_REQUEST
;
178 PARA_INFO_LOG("received get request\n");
181 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
182 phsd
->status
= HTTP_STREAMING
;
183 http_send_ok_msg(sc
);
185 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
186 if (http_send_err_msg(sc
) >= 0)
187 shutdown_client(sc
, hss
);
191 sc
= accept_sender_client(hss
, rfds
);
194 phsd
= para_malloc(sizeof(*phsd
));
195 sc
->private_data
= phsd
;
196 phsd
->status
= HTTP_CONNECTED
;
199 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
201 struct sender_client
*sc
, *tmp
;
204 FOR_EACH_LISTEN_FD(n
, hss
) {
205 if (hss
->listen_fds
[n
] < 0)
207 para_fd_set(hss
->listen_fds
[n
], rfds
, max_fileno
);
209 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
210 struct private_http_sender_data
*phsd
= sc
->private_data
;
211 if (phsd
->status
== HTTP_CONNECTED
) /* need to recv get request */
212 para_fd_set(sc
->fd
, rfds
, max_fileno
);
213 if (phsd
->status
== HTTP_GOT_GET_REQUEST
||
214 phsd
->status
== HTTP_INVALID_GET_REQUEST
)
215 para_fd_set(sc
->fd
, wfds
, max_fileno
);
219 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
221 generic_com_on(hss
, IPPROTO_TCP
);
225 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
227 generic_com_off(hss
);
231 static int http_com_deny(struct sender_command_data
*scd
)
233 generic_com_deny(scd
, hss
);
237 static int http_com_allow(struct sender_command_data
*scd
)
239 generic_com_allow(scd
, hss
);
243 static char *http_status(void)
245 return generic_sender_status(hss
, "http");
249 * Initialize the client list and the access control list, and optionally
250 * listen on the tcp port.
252 static void http_send_init(void)
254 init_sender_status(hss
, OPT_RESULT(HTTP_ACCESS
),
255 OPT_RESULT(HTTP_LISTEN_ADDRESS
),
256 OPT_UINT32_VAL(HTTP_PORT
), OPT_UINT32_VAL(HTTP_MAX_CLIENTS
),
257 OPT_GIVEN(HTTP_DEFAULT_DENY
));
258 if (OPT_GIVEN(HTTP_NO_AUTOSTART
))
260 generic_com_on(hss
, IPPROTO_TCP
);
266 * This is the only sender which does not FEC-encode the stream. This is not
267 * necessary because HTTP sits on top of TCP, a reliable transport which
268 * retransmits lost packets automatically. The sender employs per-client queues
269 * which queue chunks of audio data if they can not be sent immediately because
270 * the write operation would block. Most methods of the sender are implemented
271 * as wrappers for the generic functions defined in \ref send_common.c.
273 const struct sender http_sender
= {
275 .init
= http_send_init
,
276 .shutdown
= http_shutdown
,
277 .pre_select
= http_pre_select
,
278 .post_select
= http_post_select
,
280 .shutdown_clients
= http_shutdown_clients
,
282 [SENDER_on
] = http_com_on
,
283 [SENDER_off
] = http_com_off
,
284 [SENDER_deny
] = http_com_deny
,
285 [SENDER_allow
] = http_com_allow
,
287 .help
= generic_sender_help
,
288 .status
= http_status
,