2 * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file dccp_send.c paraslash's dccp sender */
10 * based on server.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
14 #include <sys/types.h>
28 #include "close_on_fork.h"
29 #include "chunk_queue.h"
30 #include "server.cmdline.h"
32 /** the list of connected clients **/
33 static struct list_head clients
;
34 static int listen_fd
= -1;
35 static struct sender
*self
;
37 /** Maximal number of bytes in a chunk queue. */
38 #define DCCP_MAX_PENDING_BYTES 40000
40 /** describes one connected client */
42 /** the dccp socket */
44 /** The socket `name' of the client. */
46 /** the position of this client in the client list */
47 struct list_head node
;
48 /** non-zero if audio file header has been sent */
50 /** The list of pending chunks for this client. */
51 struct chunk_queue
*cq
;
54 static void dccp_pre_select( int *max_fileno
, fd_set
*rfds
,
55 __a_unused fd_set
*wfds
)
59 FD_SET(listen_fd
, rfds
);
60 *max_fileno
= PARA_MAX(*max_fileno
, listen_fd
);
63 static void dccp_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
65 struct dccp_client
*dc
;
68 if (listen_fd
< 0 || !FD_ISSET(listen_fd
, rfds
))
70 ret
= para_accept(listen_fd
, NULL
, 0);
72 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
77 * Bypass unused CCID paths: the sender does not receive application data
78 * from the client; by shutting down this unused communication path we can
79 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
81 if (shutdown(fd
, SHUT_RD
) < 0) {
82 PARA_ERROR_LOG("shutdown(SHUT_RD): %s\n", strerror(errno
));
85 ret
= mark_fd_nonblocking(fd
);
87 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
90 dc
= para_calloc(sizeof(struct dccp_client
));
92 dc
->name
= make_message("%s", remote_name(dc
->fd
));
93 PARA_NOTICE_LOG("connection from %s\n", dc
->name
);
94 para_list_add(&dc
->node
, &clients
);
95 add_close_on_fork_list(dc
->fd
);
96 dc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
102 static int dccp_open(void)
104 int ret
= para_listen(AF_UNSPEC
, IPPROTO_DCCP
, conf
.dccp_port_arg
);
109 ret
= mark_fd_nonblocking(listen_fd
);
111 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
114 add_close_on_fork_list(listen_fd
);
118 static void dccp_shutdown_client(struct dccp_client
*dc
)
120 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", dc
->name
, dc
->fd
);
123 del_close_on_fork_list(dc
->fd
);
130 * ret: Negative on errors, zero if nothing was written and write returned
131 * EAGAIN, number of bytes written else.
133 static int dccp_write(int fd
, const char *buf
, size_t len
)
138 while (written
< len
) {
139 ret
= write(fd
, buf
+ written
, PARA_MIN(1024, len
- written
));
141 * Error handling: CCID3 has a sending wait queue which fills up and is
142 * emptied asynchronously. The EAGAIN case means that there is currently
143 * no space in the wait queue, but this can change at any moment and is
144 * thus not an error condition.
146 if (ret
< 0 && errno
== EAGAIN
)
149 PARA_ERROR_LOG("%s\n", strerror(errno
));
150 return -E_DCCP_WRITE
;
157 static int queue_chunk_or_shutdown(struct dccp_client
*dc
, long unsigned chunk_num
,
160 int ret
= cq_enqueue(dc
->cq
, chunk_num
, sent
);
162 PARA_NOTICE_LOG("enqueue error\n");
163 dccp_shutdown_client(dc
);
168 static int send_queued_chunks(struct dccp_client
*dc
)
170 struct queued_chunk
*qc
;
171 while ((qc
= cq_peek(dc
->cq
))) {
175 cq_get(qc
, &buf
, &len
);
176 ret
= dccp_write(dc
->fd
, buf
, len
);
179 cq_update(dc
->cq
, ret
);
187 static void dccp_send(long unsigned current_chunk
,
188 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
190 struct dccp_client
*dc
, *tmp
;
195 if (listen_fd
< 0 || !len
)
198 list_for_each_entry_safe(dc
, tmp
, &clients
, node
) {
199 if (!dc
->header_sent
&& current_chunk
) {
200 header_buf
= vss_get_header(&header_len
);
201 if (header_buf
&& header_len
> 0) {
202 if (queue_chunk_or_shutdown(dc
, -1U, 0) < 0)
207 ret
= send_queued_chunks(dc
);
209 dccp_shutdown_client(dc
);
212 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
213 ret
= dccp_write(dc
->fd
, buf
, len
);
215 PARA_NOTICE_LOG("%s\n", para_strerror(-ret
));
216 dccp_shutdown_client(dc
);
220 queue_chunk_or_shutdown(dc
, current_chunk
, ret
);
224 static void dccp_shutdown_clients(void)
226 struct dccp_client
*dc
, *tmp
;
228 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
229 dccp_shutdown_client(dc
);
232 static char *dccp_info(void)
236 struct dccp_client
*dc
, *tmp
;
239 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
241 buf
= make_message("dccp connected clients: %d\n", num_clients
);
245 static char *dccp_help(void)
247 return make_message("no help available\n");
251 * the init function of the dccp sender
253 * \param s pointer to the dccp sender struct
255 * It initializes all function pointers of \a s and starts
256 * listening on the given port.
258 void dccp_send_init(struct sender
*s
)
262 INIT_LIST_HEAD(&clients
);
265 s
->pre_select
= dccp_pre_select
;
266 s
->post_select
= dccp_post_select
;
267 s
->shutdown_clients
= dccp_shutdown_clients
;
269 s
->client_cmds
[SENDER_ON
] = NULL
;
270 s
->client_cmds
[SENDER_OFF
] = NULL
;
271 s
->client_cmds
[SENDER_DENY
] = NULL
;
272 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
273 s
->client_cmds
[SENDER_ADD
] = NULL
;
274 s
->client_cmds
[SENDER_DELETE
] = NULL
;
278 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));