2 * Copyright (C) 2006-2007 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 (!FD_ISSET(listen_fd
, rfds
))
70 ret
= para_accept(listen_fd
, NULL
, 0);
72 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
76 * Bypass unused CCID paths: the sender does not receive application data
77 * from the client; by shutting down this unused communication path we can
78 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
80 if (shutdown(ret
, SHUT_RD
) < 0) {
81 PARA_ERROR_LOG("shutdown(SHUT_RD): %s\n", strerror(errno
));
84 dc
= para_calloc(sizeof(struct dccp_client
));
86 dc
->name
= make_message("%s", remote_name(dc
->fd
));
87 PARA_NOTICE_LOG("connection from %s\n", dc
->name
);
88 para_list_add(&dc
->node
, &clients
);
89 add_close_on_fork_list(dc
->fd
);
90 mark_fd_nonblocking(dc
->fd
);
91 dc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
94 static int dccp_open(void)
96 int ret
= para_listen(AF_UNSPEC
, IPPROTO_DCCP
, conf
.dccp_port_arg
);
101 add_close_on_fork_list(listen_fd
);
102 mark_fd_nonblocking(listen_fd
);
106 static void dccp_shutdown_client(struct dccp_client
*dc
)
108 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", dc
->name
, dc
->fd
);
111 del_close_on_fork_list(dc
->fd
);
118 * ret: Negative on errors, zero if nothing was written and write returned
119 * EAGAIN, number of bytes written else.
121 static int dccp_write(int fd
, const char *buf
, size_t len
)
126 while (written
< len
) {
127 ret
= write(fd
, buf
+ written
, PARA_MIN(1024, len
- written
));
129 * Error handling: CCID3 has a sending wait queue which fills up and is
130 * emptied asynchronously. The EAGAIN case means that there is currently
131 * no space in the wait queue, but this can change at any moment and is
132 * thus not an error condition.
134 if (ret
< 0 && errno
== EAGAIN
)
137 PARA_ERROR_LOG("%s\n", strerror(errno
));
138 return -E_DCCP_WRITE
;
145 static int queue_chunk_or_shutdown(struct dccp_client
*dc
, long unsigned chunk_num
,
148 int ret
= cq_enqueue(dc
->cq
, chunk_num
, sent
);
150 PARA_NOTICE_LOG("enqueue error\n");
151 dccp_shutdown_client(dc
);
156 static int send_queued_chunks(struct dccp_client
*dc
)
158 struct queued_chunk
*qc
;
159 while ((qc
= cq_peek(dc
->cq
))) {
163 cq_get(qc
, &buf
, &len
);
164 ret
= dccp_write(dc
->fd
, buf
, len
);
167 cq_update(dc
->cq
, ret
);
175 static void dccp_send(long unsigned current_chunk
,
176 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
178 struct dccp_client
*dc
, *tmp
;
183 if (listen_fd
< 0 || !len
)
186 list_for_each_entry_safe(dc
, tmp
, &clients
, node
) {
187 if (!dc
->header_sent
&& current_chunk
) {
188 header_buf
= vss_get_header(&header_len
);
189 if (header_buf
&& header_len
> 0) {
190 if (queue_chunk_or_shutdown(dc
, -1U, 0) < 0)
195 ret
= send_queued_chunks(dc
);
197 dccp_shutdown_client(dc
);
200 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
201 ret
= dccp_write(dc
->fd
, buf
, len
);
203 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret
));
204 dccp_shutdown_client(dc
);
208 queue_chunk_or_shutdown(dc
, current_chunk
, ret
);
212 static void dccp_shutdown_clients(void)
214 struct dccp_client
*dc
, *tmp
;
216 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
217 dccp_shutdown_client(dc
);
220 static char *dccp_info(void)
224 struct dccp_client
*dc
, *tmp
;
227 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
229 buf
= make_message("dccp connected clients: %d\n", num_clients
);
233 static char *dccp_help(void)
235 return make_message("no help available\n");
239 * the init function of the dccp sender
241 * \param s pointer to the dccp sender struct
243 * It initializes all function pointers of \a s and starts
244 * listening on the given port.
246 void dccp_send_init(struct sender
*s
)
250 INIT_LIST_HEAD(&clients
);
253 s
->pre_select
= dccp_pre_select
;
254 s
->post_select
= dccp_post_select
;
255 s
->shutdown_clients
= dccp_shutdown_clients
;
257 s
->client_cmds
[SENDER_ON
] = NULL
;
258 s
->client_cmds
[SENDER_OFF
] = NULL
;
259 s
->client_cmds
[SENDER_DENY
] = NULL
;
260 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
261 s
->client_cmds
[SENDER_ADD
] = NULL
;
262 s
->client_cmds
[SENDER_DELETE
] = NULL
;
266 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
267 s
->status
= SENDER_OFF
;
269 s
->status
= SENDER_ON
;