c506fd96f15c222386fc14b5c7a0d74462e31f4e
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 /** address information about the client */
45 struct sockaddr_in addr
;
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 dc
= para_calloc(sizeof(struct dccp_client
));
71 ret
= para_accept(listen_fd
, &dc
->addr
, sizeof(struct sockaddr_in
));
73 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
76 PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc
->addr
.sin_addr
));
78 para_list_add(&dc
->node
, &clients
);
79 add_close_on_fork_list(dc
->fd
);
80 mark_fd_nonblock(dc
->fd
);
81 dc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
84 static int dccp_open(void)
86 struct sockaddr_in servaddr
;
89 ret
= dccp_get_socket();
94 memset(&servaddr
, 0, sizeof(servaddr
));
95 servaddr
.sin_family
= AF_INET
;
96 servaddr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
97 servaddr
.sin_port
= htons(conf
.dccp_port_arg
);
98 ret
= bind(listen_fd
, (struct sockaddr
*)&servaddr
, sizeof(servaddr
));
101 ret
= dccp_set_socket(listen_fd
);
104 ret
= listen(listen_fd
, 0);
106 PARA_ERROR_LOG("%s\n", strerror(errno
));
107 return -E_DCCP_LISTEN
;
109 PARA_DEBUG_LOG("listening on fd %d\n", listen_fd
);
110 add_close_on_fork_list(listen_fd
);
111 mark_fd_nonblock(listen_fd
);
115 static void dccp_shutdown_client(struct dccp_client
*dc
)
117 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc
->addr
.sin_addr
),
120 del_close_on_fork_list(dc
->fd
);
127 * ret: Negative on errors, zero if nothing was written and write returned
128 * EAGAIN, number of bytes written else.
130 static int dccp_write(int fd
, const char *buf
, size_t len
)
135 while (written
< len
) {
136 ret
= write(fd
, buf
+ written
, PARA_MIN(1024, len
- written
));
138 * Error handling: CCID3 has a sending wait queue which fills up and is
139 * emptied asynchronously. The EAGAIN case means that there is currently
140 * no space in the wait queue, but this can change at any moment and is
141 * thus not an error condition.
143 if (ret
< 0 && errno
== EAGAIN
)
146 PARA_ERROR_LOG("%s\n", strerror(errno
));
147 return -E_DCCP_WRITE
;
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
;
192 if (listen_fd
< 0 || !len
)
195 list_for_each_entry_safe(dc
, tmp
, &clients
, node
) {
196 if (!dc
->header_sent
&& current_chunk
) {
197 header_buf
= vss_get_header(&header_len
);
198 if (header_buf
&& header_len
> 0) {
199 if (queue_chunk_or_shutdown(dc
, -1U, 0) < 0)
204 ret
= send_queued_chunks(dc
);
206 dccp_shutdown_client(dc
);
209 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
210 ret
= dccp_write(dc
->fd
, buf
, len
);
212 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret
));
213 dccp_shutdown_client(dc
);
217 queue_chunk_or_shutdown(dc
, current_chunk
, ret
);
221 static void dccp_shutdown_clients(void)
223 struct dccp_client
*dc
, *tmp
;
225 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
226 dccp_shutdown_client(dc
);
229 static char *dccp_info(void)
233 struct dccp_client
*dc
, *tmp
;
236 list_for_each_entry_safe(dc
, tmp
, &clients
, node
)
238 buf
= make_message("dccp connected clients: %d\n", num_clients
);
242 static char *dccp_help(void)
244 return make_message("no help available\n");
248 * the init function of the dccp sender
250 * \param s pointer to the dccp sender struct
252 * It initializes all function pointers of \a s and starts
253 * listening on the given port.
255 void dccp_send_init(struct sender
*s
)
259 INIT_LIST_HEAD(&clients
);
262 s
->pre_select
= dccp_pre_select
;
263 s
->post_select
= dccp_post_select
;
264 s
->shutdown_clients
= dccp_shutdown_clients
;
266 s
->client_cmds
[SENDER_ON
] = NULL
;
267 s
->client_cmds
[SENDER_OFF
] = NULL
;
268 s
->client_cmds
[SENDER_DENY
] = NULL
;
269 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
270 s
->client_cmds
[SENDER_ADD
] = NULL
;
271 s
->client_cmds
[SENDER_DELETE
] = NULL
;
275 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
276 s
->status
= SENDER_OFF
;
278 s
->status
= SENDER_ON
;