7a4c01bcb6cc1c80c77e06bc14b164dce8b3304d
1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file send.h Sender-related defines and structures. */
5 #define SENDER_SUBCOMMANDS \
6 SENDER_SUBCOMMAND(add) /**< Add a target (udp only). */ \
7 SENDER_SUBCOMMAND(delete) /**< Delete a target (udp only). */ \
8 SENDER_SUBCOMMAND(allow) /**< Allow connections from given IP address(es). */ \
9 SENDER_SUBCOMMAND(deny) /**< Deny connections from given IP address(es). */ \
10 SENDER_SUBCOMMAND(on) /**< Activate the sender. */ \
11 SENDER_SUBCOMMAND(off) /**< Deactivate the sender. */ \
13 #define SENDER_SUBCOMMAND(_name) SENDER_ ## _name,
14 enum sender_subcommand
{
16 NUM_SENDER_CMDS
/**< Used as array size in struct \ref sender. */
18 #undef SENDER_SUBCOMMAND
19 #define SENDER_SUBCOMMAND(_name) #_name,
22 * Describes one supported sender of para_server.
24 * \sa \ref http_send.c \ref udp_send.c, \ref dccp_send.c.
27 /** The name of the sender. */
30 * Parse the command line options and initialize this sender (e.g.,
31 * initialize target or access control lists, listen on a network
36 * Return the help text of this sender.
38 * The result must be dynamically allocated and is freed by the caller.
42 * Return current status info about this sender.
44 * The result must be dynamically allocated and is freed by the caller.
46 char* (*status
)(void);
50 * It gets called whenever para_server is playing and the current
51 * audio format handler indicates that another chunk of data should
52 * be sent now. The two parameters \a current_chunk and \a chunks_sent
53 * only differ if the stream was repositioned by the \a ff or \a jmp
54 * command. Of course, \a buf is a pointer to the chunk of data which
55 * should be sent, and \a len is the length of this buffer.
57 void (*send
)(long unsigned current_chunk
, long unsigned chunks_sent
,
58 const char *buf
, size_t len
, const char *header_buf
,
61 * Add file descriptors to fd_sets.
63 * The pre_select function of each supported sender is called just before
64 * para_server enters its main select loop. Each sender may add its own
65 * file descriptors to the \a rfds or the \a wfds set.
67 * If a file descriptor was added, \a max_fileno must be increased by
68 * this function, if necessary.
72 void (*pre_select
)(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
);
74 * Handle the file descriptors which are ready for I/O.
76 * If the pre_select hook added one ore more file descriptors to the
77 * read or write set, this is the hook to check the result and do any
78 * I/O on those descriptors which are ready for reading/writing.
80 void (*post_select
)(fd_set
*rfds
, fd_set
*wfds
);
82 * Terminate all connected clients.
84 * This is called e.g. if the stop command was executed. It should make
85 * the clients aware of the end-of-file condition.
87 void (*shutdown_clients
)(void);
88 /** Dellocate all resources. Only called on exit. */
89 void (*shutdown
)(void);
91 * Array of function pointers for the sender subcommands.
93 * Each sender may implement any subset of the sender commands by
94 * filling in the appropriate function pointer in the array. A \p NULL
95 * pointer means this command is not implemented by this sender.
97 int (*client_cmds
[NUM_SENDER_CMDS
])(struct sender_command_data
*);
99 * Resolve target-specific URL string
101 * This method must be defined if the sender supports the add/delete
102 * subcommands. It interprets a string specifying a target URL in a
103 * sender-specific fashion (e.g. embedded FEC string). It can also
104 * fill in sender-specific defaults if necessary.
106 int (*resolve_target
)(const char *, struct sender_command_data
*);
109 /** NULL-terminated list, defined in \ref vss.c. */
110 extern const struct sender
* const senders
[];
111 /** Iterate over all senders. */
112 #define FOR_EACH_SENDER(_i) for ((_i) = 0; senders[(_i)]; (_i)++)
114 /** Describes one client, connected to a paraslash sender. */
115 struct sender_client
{
116 /** The file descriptor of the client. */
118 /** The socket "name" of the client. */
120 /** The position of this client in the client list. */
121 struct list_head node
;
122 /** Non-zero if audio file header has been sent. */
124 /** The list of pending chunks for this client. */
125 struct chunk_queue
*cq
;
126 /** Data specific to the particular sender. */
131 * Each paraslash sender may register arbitrary many clients to the virtual
132 * streaming system, possibly with varying fec parameters. In order to do so,
133 * it must allocate a \a fec_client_parms structure and pass it to \ref
134 * vss_add_fec_client.
136 * Clients are automatically removed from that list by the vss if an error
137 * occurs, or if the sender requests deletion of a client by calling \ref
138 * vss_del_fec_client().
141 /** FEC parameters requested by FEC clients. */
142 struct fec_client_parms
{
143 /** Number of data slices plus redundant slices. */
144 uint8_t slices_per_group
;
145 /** Number of slices minus number of redundant slices. */
146 uint8_t data_slices_per_group
;
147 /** Whether the header must be sent periodically. */
148 bool need_periodic_header
;
150 * Transport-layer initialisation for FEC support.
152 * This optional function serves (a) to make the transport layer
153 * ready to send FEC slices and (b) to determine the Maximum
154 * Packet Size (MPS) supported by the connection. The MPS value
155 * determines the largest payload size. This value is used to
156 * send FEC slices that are not larger than the path MTU, to avoid
157 * fragmentation and to maximize packet utilization. The user can
158 * alternatively specify a slice size of up to this value.
160 int (*init_fec
)(struct sender_client
*sc
);
161 /** Push out FEC-encoded packets */
162 void (*send_fec
)(struct sender_client
*sc
, char *buf
, size_t len
);
165 /** Describes the current status of one paraslash sender. */
166 struct sender_status
{
167 /** The file descriptor of the socket this sender is listening on. */
169 /** The TCP/DCCP port used by this sender. */
171 /** The current number of simultaneous connections. */
173 /** The maximal number of simultaneous connections. */
175 /** Whether the access control list is a whitelist. */
177 /** The whitelist/blacklist. */
178 struct list_head acl
;
179 /** The list of connected clients. */
180 struct list_head client_list
;
183 void shutdown_client(struct sender_client
*sc
, struct sender_status
*ss
);
184 void shutdown_clients(struct sender_status
*ss
);
185 void init_sender_status(struct sender_status
*ss
,
186 const struct lls_opt_result
*acl_opt_result
, int port
,
187 int max_clients
, int default_deny
);
188 char *generic_sender_status(struct sender_status
*ss
, const char *name
);
189 void generic_com_allow(struct sender_command_data
*scd
,
190 struct sender_status
*ss
);
191 void generic_com_deny(struct sender_command_data
*scd
,
192 struct sender_status
*ss
);
193 void generic_com_on(struct sender_status
*ss
, unsigned protocol
);
194 void generic_acl_deplete(struct list_head
*acl
);
195 void generic_com_off(struct sender_status
*ss
);
196 char *generic_sender_help(void);
197 struct sender_client
*accept_sender_client(struct sender_status
*ss
, fd_set
*rfds
);
198 int send_queued_chunks(int fd
, struct chunk_queue
*cq
);
199 int parse_fec_url(const char *arg
, struct sender_command_data
*scd
);