887801a92f3a30128928e95e5232d7c39d4a3b59
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;
36 /** Maximal number of bytes in a chunk queue. */
37 #define DCCP_MAX_PENDING_BYTES 40000
39 /** describes one connected client */
41 /** the dccp socket */
43 /** The socket `name' of the client. */
45 /** the position of this client in the client list */
46 struct list_head node
;
47 /** non-zero if audio file header has been sent */
49 /** The list of pending chunks for this client. */
50 struct chunk_queue
*cq
;
53 static void dccp_pre_select(int *max_fileno
, fd_set
*rfds
,
54 __a_unused fd_set
*wfds
)
58 FD_SET(listen_fd
, rfds
);
59 *max_fileno
= PARA_MAX(*max_fileno
, listen_fd
);
62 static void dccp_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
64 struct dccp_client
*dc
;
67 if (listen_fd
< 0 || !FD_ISSET(listen_fd
, rfds
))
69 ret
= para_accept(listen_fd
, NULL
, 0);
71 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(fd
, SHUT_RD
) < 0) {
81 PARA_ERROR_LOG("shutdown(SHUT_RD): %s\n", strerror(errno
));
84 ret
= mark_fd_nonblocking(fd
);
86 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
89 dc
= para_calloc(sizeof(struct dccp_client
));
91 dc
->name
= make_message("%s", remote_name(dc
->fd
));
92 PARA_NOTICE_LOG("connection from %s\n", dc
->name
);
93 para_list_add(&dc
->node
, &clients
);
94 add_close_on_fork_list(dc
->fd
);
95 dc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
101 static int dccp_open(void)
103 int ret
= para_listen(AF_UNSPEC
, IPPROTO_DCCP
, conf
.dccp_port_arg
);
108 ret
= mark_fd_nonblocking(listen_fd
);
110 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
113 add_close_on_fork_list(listen_fd
);
117 static void dccp_shutdown_client(struct dccp_client
*dc
)
119 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", dc
->name
, dc
->fd
);
122 del_close_on_fork_list(dc
->fd
);
129 * ret: Negative on errors, zero if nothing was written and write returned
130 * EAGAIN, number of bytes written else.
132 static int dccp_write(int fd
, const char *buf
, size_t len
)
137 while (written
< len
) {
138 ret
= write(fd
, buf
+ written
, PARA_MIN(1024, len
- written
));
140 * Error handling: CCID3 has a sending wait queue which fills
141 * up and is emptied asynchronously. The EAGAIN case means that
142 * there is currently no space in the wait queue, but this can
143 * change at any moment and is thus not an error condition.
145 if (ret
< 0 && errno
== EAGAIN
)
148 return -ERRNO_TO_PARA_ERROR(errno
);
154 static int queue_chunk_or_shutdown(struct dccp_client
*dc
, long unsigned chunk_num
,
157 int ret
= cq_enqueue(dc
->cq
, chunk_num
, sent
);
159 PARA_NOTICE_LOG("enqueue error\n");
160 dccp_shutdown_client(dc
);
165 static int send_queued_chunks(struct dccp_client
*dc
)
167 struct queued_chunk
*qc
;
168 while ((qc
= cq_peek(dc
->cq
))) {
172 cq_get(qc
, &buf
, &len
);
173 ret
= dccp_write(dc
->fd
, buf
, len
);
176 cq_update(dc
->cq
, ret
);
184 static void dccp_send(long unsigned current_chunk
,
185 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
187 struct dccp_client
*dc
, *tmp
;
191 list_for_each_entry_safe(dc
, tmp
, &clients
, node
) {
192 if (!dc
->header_sent
&& current_chunk
) {
194 header_buf
= vss_get_header(&header_len
);
195 if (header_buf
&& header_len
> 0) {
196 if (queue_chunk_or_shutdown(dc
, -1U, 0) < 0)
201 ret
= send_queued_chunks(dc
);
203 dccp_shutdown_client(dc
);
208 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
209 ret
= dccp_write(dc
->fd
, buf
, len
);
211 PARA_NOTICE_LOG("%s\n", para_strerror(-ret
));
212 dccp_shutdown_client(dc
);
216 queue_chunk_or_shutdown(dc
, current_chunk
, ret
);
220 static void dccp_shutdown_clients(void)
222 struct dccp_client
*dc
, *tmp
;
224 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
225 dccp_shutdown_client(dc
);
228 static char *dccp_info(void)
232 struct dccp_client
*dc
, *tmp
;
235 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
237 buf
= make_message("dccp connected clients: %d\n", num_clients
);
241 static char *dccp_help(void)
243 return make_message("no help available\n");
247 * the init function of the dccp sender
249 * \param s pointer to the dccp sender struct
251 * It initializes all function pointers of \a s and starts
252 * listening on the given port.
254 void dccp_send_init(struct sender
*s
)
258 INIT_LIST_HEAD(&clients
);
261 s
->pre_select
= dccp_pre_select
;
262 s
->post_select
= dccp_post_select
;
263 s
->shutdown_clients
= dccp_shutdown_clients
;
265 s
->client_cmds
[SENDER_ON
] = NULL
;
266 s
->client_cmds
[SENDER_OFF
] = NULL
;
267 s
->client_cmds
[SENDER_DENY
] = NULL
;
268 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
269 s
->client_cmds
[SENDER_ADD
] = NULL
;
270 s
->client_cmds
[SENDER_DELETE
] = NULL
;
273 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));