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
);
85 static int queue_chunk_or_shutdown(struct sender_client
*sc
,
86 struct sender_status
*ss
, const char *buf
, size_t num_bytes
)
88 int ret
= cq_enqueue(sc
->cq
, buf
, num_bytes
);
90 shutdown_client(sc
, ss
);
95 * Send one chunk of audio data to a connected client.
97 * \param sc The client.
98 * \param ss The sender.
99 * \param current_chunk The number of the chunk to write.
100 * \param buf The data to write.
101 * \param len The number of bytes of \a buf.
102 * \param header_buf The audio file header.
103 * \param header_len The number of bytes of \a header_buf.
105 * On errors, the client is shut down. If only a part of the buffer could be
106 * written, the remainder is put into the chunk queue for that client.
108 static void http_send_chunk(struct sender_client
*sc
, struct sender_status
*ss
,
109 long unsigned current_chunk
, const char *buf
, size_t len
,
110 const char *header_buf
, size_t header_len
)
114 if (!sc
->header_sent
&& current_chunk
) {
115 if (header_buf
&& header_len
> 0) {
116 ret
= queue_chunk_or_shutdown(sc
, ss
, header_buf
, header_len
);
122 ret
= send_queued_chunks(sc
->fd
, sc
->cq
);
124 shutdown_client(sc
, ss
);
129 if (!ret
) { /* still data left in the queue */
130 ret
= queue_chunk_or_shutdown(sc
, ss
, buf
, len
);
133 ret
= xwrite(sc
->fd
, buf
, len
);
135 shutdown_client(sc
, ss
);
139 ret
= queue_chunk_or_shutdown(sc
, ss
, buf
+ ret
, len
- ret
);
142 PARA_NOTICE_LOG("%s\n", para_strerror(-ret
));
145 static void http_send(long unsigned current_chunk
,
146 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
,
147 const char *header_buf
, size_t header_len
)
149 struct sender_client
*sc
, *tmp
;
151 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
152 struct private_http_sender_data
*phsd
= sc
->private_data
;
154 if (phsd
->status
== HTTP_STREAMING
)
155 http_send_chunk(sc
, hss
, current_chunk
, buf
, len
,
156 header_buf
, header_len
);
160 static void http_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
162 struct sender_client
*sc
, *tmp
;
163 struct private_http_sender_data
*phsd
;
166 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
167 phsd
= sc
->private_data
;
168 switch (phsd
->status
) {
169 case HTTP_STREAMING
: /* nothing to do */
171 case HTTP_CONNECTED
: /* need to recv get request */
172 ret
= read_pattern(sc
->fd
, HTTP_GET_MSG
, MAXLINE
, rfds
);
174 phsd
->status
= HTTP_INVALID_GET_REQUEST
;
176 phsd
->status
= HTTP_GOT_GET_REQUEST
;
177 PARA_INFO_LOG("received get request\n");
180 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
181 phsd
->status
= HTTP_STREAMING
;
182 http_send_ok_msg(sc
);
184 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
185 if (http_send_err_msg(sc
) >= 0)
186 shutdown_client(sc
, hss
);
190 sc
= accept_sender_client(hss
, rfds
);
193 phsd
= para_malloc(sizeof(*phsd
));
194 sc
->private_data
= phsd
;
195 phsd
->status
= HTTP_CONNECTED
;
198 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
200 struct sender_client
*sc
, *tmp
;
203 FOR_EACH_LISTEN_FD(n
, hss
) {
204 if (hss
->listen_fds
[n
] < 0)
206 para_fd_set(hss
->listen_fds
[n
], rfds
, max_fileno
);
208 list_for_each_entry_safe(sc
, tmp
, &hss
->client_list
, node
) {
209 struct private_http_sender_data
*phsd
= sc
->private_data
;
210 if (phsd
->status
== HTTP_CONNECTED
) /* need to recv get request */
211 para_fd_set(sc
->fd
, rfds
, max_fileno
);
212 if (phsd
->status
== HTTP_GOT_GET_REQUEST
||
213 phsd
->status
== HTTP_INVALID_GET_REQUEST
)
214 para_fd_set(sc
->fd
, wfds
, max_fileno
);
218 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
220 generic_com_on(hss
, IPPROTO_TCP
);
224 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
226 generic_com_off(hss
);
230 static int http_com_deny(struct sender_command_data
*scd
)
232 generic_com_deny(scd
, hss
);
236 static int http_com_allow(struct sender_command_data
*scd
)
238 generic_com_allow(scd
, hss
);
242 static char *http_status(void)
244 return generic_sender_status(hss
, "http");
248 * Initialize the client list and the access control list, and optionally
249 * listen on the tcp port.
251 static void http_send_init(void)
253 init_sender_status(hss
, OPT_RESULT(HTTP_ACCESS
),
254 OPT_RESULT(HTTP_LISTEN_ADDRESS
),
255 OPT_UINT32_VAL(HTTP_PORT
), OPT_UINT32_VAL(HTTP_MAX_CLIENTS
),
256 OPT_GIVEN(HTTP_DEFAULT_DENY
));
257 if (OPT_GIVEN(HTTP_NO_AUTOSTART
))
259 generic_com_on(hss
, IPPROTO_TCP
);
265 * This is the only sender which does not FEC-encode the stream. This is not
266 * necessary because HTTP sits on top of TCP, a reliable transport which
267 * retransmits lost packets automatically. The sender employs per-client queues
268 * which queue chunks of audio data if they can not be sent immediately because
269 * the write operation would block. Most methods of the sender are implemented
270 * as wrappers for the generic functions defined in \ref send_common.c.
272 const struct sender http_sender
= {
274 .init
= http_send_init
,
275 .shutdown
= http_shutdown
,
276 .pre_select
= http_pre_select
,
277 .post_select
= http_post_select
,
279 .shutdown_clients
= http_shutdown_clients
,
281 [SENDER_on
] = http_com_on
,
282 [SENDER_off
] = http_com_off
,
283 [SENDER_deny
] = http_com_deny
,
284 [SENDER_allow
] = http_com_allow
,
286 .help
= generic_sender_help
,
287 .status
= http_status
,