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>
29 #include "close_on_fork.h"
30 #include "chunk_queue.h"
31 #include "server.cmdline.h"
33 /** the list of connected clients **/
34 static struct list_head clients
;
35 static int listen_fd
= -1;
36 static struct sender
*self
;
38 /** Maximal number of bytes in a chunk queue. */
39 #define DCCP_MAX_PENDING_BYTES 40000
41 /** describes one connected client */
43 /** the dccp socket */
45 /** The socket `name' of the client. */
47 /** the position of this client in the client list */
48 struct list_head node
;
49 /** non-zero if audio file header has been sent */
51 /** The list of pending chunks for this client. */
52 struct chunk_queue
*cq
;
55 static void dccp_pre_select( int *max_fileno
, fd_set
*rfds
,
56 __a_unused fd_set
*wfds
)
60 FD_SET(listen_fd
, rfds
);
61 *max_fileno
= PARA_MAX(*max_fileno
, listen_fd
);
64 static void dccp_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
66 struct dccp_client
*dc
;
69 if (!FD_ISSET(listen_fd
, rfds
))
71 ret
= para_accept(listen_fd
, NULL
, 0);
73 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
76 dc
= para_calloc(sizeof(struct dccp_client
));
78 dc
->name
= make_message("%s", remote_name(dc
->fd
));
79 PARA_NOTICE_LOG("connection from %s\n", dc
->name
);
80 para_list_add(&dc
->node
, &clients
);
81 add_close_on_fork_list(dc
->fd
);
82 mark_fd_nonblocking(dc
->fd
);
83 dc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
86 static int dccp_open(void)
88 int ret
= para_listen(AF_UNSPEC
, IPPROTO_DCCP
, conf
.dccp_port_arg
);
93 add_close_on_fork_list(listen_fd
);
94 mark_fd_nonblocking(listen_fd
);
98 static void dccp_shutdown_client(struct dccp_client
*dc
)
100 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", dc
->name
, dc
->fd
);
103 del_close_on_fork_list(dc
->fd
);
110 * ret: Negative on errors, zero if nothing was written and write returned
111 * EAGAIN, number of bytes written else.
113 static int dccp_write(int fd
, const char *buf
, size_t len
)
118 while (written
< len
) {
119 ret
= write(fd
, buf
+ written
, PARA_MIN(1024, len
- written
));
121 * Error handling: CCID3 has a sending wait queue which fills up and is
122 * emptied asynchronously. The EAGAIN case means that there is currently
123 * no space in the wait queue, but this can change at any moment and is
124 * thus not an error condition.
126 if (ret
< 0 && errno
== EAGAIN
)
129 PARA_ERROR_LOG("%s\n", strerror(errno
));
130 return -E_DCCP_WRITE
;
137 static int queue_chunk_or_shutdown(struct dccp_client
*dc
, long unsigned chunk_num
,
140 int ret
= cq_enqueue(dc
->cq
, chunk_num
, sent
);
142 PARA_NOTICE_LOG("enqueue error\n");
143 dccp_shutdown_client(dc
);
148 static int send_queued_chunks(struct dccp_client
*dc
)
150 struct queued_chunk
*qc
;
151 while ((qc
= cq_peek(dc
->cq
))) {
155 cq_get(qc
, &buf
, &len
);
156 ret
= dccp_write(dc
->fd
, buf
, len
);
159 cq_update(dc
->cq
, ret
);
167 static void dccp_send(long unsigned current_chunk
,
168 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
170 struct dccp_client
*dc
, *tmp
;
175 if (listen_fd
< 0 || !len
)
178 list_for_each_entry_safe(dc
, tmp
, &clients
, node
) {
179 if (!dc
->header_sent
&& current_chunk
) {
180 header_buf
= vss_get_header(&header_len
);
181 if (header_buf
&& header_len
> 0) {
182 if (queue_chunk_or_shutdown(dc
, -1U, 0) < 0)
187 ret
= send_queued_chunks(dc
);
189 dccp_shutdown_client(dc
);
192 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
193 ret
= dccp_write(dc
->fd
, buf
, len
);
195 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret
));
196 dccp_shutdown_client(dc
);
200 queue_chunk_or_shutdown(dc
, current_chunk
, ret
);
204 static void dccp_shutdown_clients(void)
206 struct dccp_client
*dc
, *tmp
;
208 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
209 dccp_shutdown_client(dc
);
212 static char *dccp_info(void)
216 struct dccp_client
*dc
, *tmp
;
219 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
221 buf
= make_message("dccp connected clients: %d\n", num_clients
);
225 static char *dccp_help(void)
227 return make_message("no help available\n");
231 * the init function of the dccp sender
233 * \param s pointer to the dccp sender struct
235 * It initializes all function pointers of \a s and starts
236 * listening on the given port.
238 void dccp_send_init(struct sender
*s
)
242 INIT_LIST_HEAD(&clients
);
245 s
->pre_select
= dccp_pre_select
;
246 s
->post_select
= dccp_post_select
;
247 s
->shutdown_clients
= dccp_shutdown_clients
;
249 s
->client_cmds
[SENDER_ON
] = NULL
;
250 s
->client_cmds
[SENDER_OFF
] = NULL
;
251 s
->client_cmds
[SENDER_DENY
] = NULL
;
252 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
253 s
->client_cmds
[SENDER_ADD
] = NULL
;
254 s
->client_cmds
[SENDER_DELETE
] = NULL
;
258 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
259 s
->status
= SENDER_OFF
;
261 s
->status
= SENDER_ON
;