2 * Copyright (C) 2006-2010 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>
15 #include <sys/types.h>
30 #include "close_on_fork.h"
31 #include "chunk_queue.h"
32 #include "server.cmdline.h"
35 /** Do not write more than that many bytes at once. */
36 #define DCCP_MAX_BYTES_PER_WRITE 1024
38 static struct sender_status dccp_sender_status
, *dss
= &dccp_sender_status
;
40 struct dccp_fec_client
{
41 struct fec_client_parms fcp
;
42 struct fec_client
*fc
;
45 static void dccp_pre_select(int *max_fileno
, fd_set
*rfds
,
46 __a_unused fd_set
*wfds
)
48 if (dss
->listen_fd
>= 0)
49 para_fd_set(dss
->listen_fd
, rfds
, max_fileno
);
53 * Query the TX CCID used on the sender-client half connection.
54 * \param sockfd Server socket descriptor to query (after accept(2)).
55 * \return CCID number > 0, -1 on error/incompatibility.
57 * NB: This feature is only available on Linux > 2.6.30; on older kernels
58 * ENOPROTOOPT ("Protocol not available") will be returned.
60 static int dccp_get_tx_ccid(int sockfd
)
63 socklen_t len
= sizeof(tx_ccid
);
65 if (getsockopt(sockfd
, SOL_DCCP
,
66 DCCP_SOCKOPT_TX_CCID
, &tx_ccid
, &len
) < 0) {
67 PARA_WARNING_LOG("DCCP_SOCKOPT_TX_CCID: %s\n", strerror(errno
));
73 static void dccp_shutdown_client(struct sender_client
*sc
)
75 struct dccp_fec_client
*dfc
= sc
->private_data
;
77 vss_del_fec_client(dfc
->fc
);
78 shutdown_client(sc
, dss
);
81 static void dccp_shutdown_clients(void)
83 struct sender_client
*sc
, *tmp
;
85 list_for_each_entry_safe(sc
, tmp
, &dss
->client_list
, node
)
86 dccp_shutdown_client(sc
);
89 static int dccp_send_fec(struct sender_client
*sc
, char *buf
, size_t len
)
91 int ret
= write_nonblock(sc
->fd
, buf
, len
, DCCP_MAX_BYTES_PER_WRITE
);
94 dccp_shutdown_client(sc
);
98 static void dccp_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
100 struct sender_client
*sc
;
101 struct dccp_fec_client
*dfc
;
104 sc
= accept_sender_client(dss
, rfds
);
108 /* If CCID identifiable, present client as <host>#<port>~<ccid> */
109 tx_ccid
= dccp_get_tx_ccid(sc
->fd
);
111 char *tmp
= make_message("%s~%d", sc
->name
, tx_ccid
);
117 * Bypass unused CCID paths: the sender does not receive application data
118 * from the client; by shutting down this unused communication path we can
119 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
121 if (shutdown(sc
->fd
, SHUT_RD
) < 0) {
122 PARA_WARNING_LOG("%s\n", strerror(errno
));
123 shutdown_client(sc
, dss
);
126 dfc
= para_calloc(sizeof(*dfc
));
127 sc
->private_data
= dfc
;
128 dfc
->fcp
.slices_per_group
= 4;
129 dfc
->fcp
.data_slices_per_group
= 3;
130 dfc
->fcp
.max_slice_bytes
= DCCP_MAX_BYTES_PER_WRITE
; /* FIXME */
131 dfc
->fcp
.init_fec
= NULL
; /* FIXME */
132 dfc
->fcp
.send_fec
= dccp_send_fec
;
133 dfc
->fc
= vss_add_fec_client(sc
, &dfc
->fcp
);
136 static int dccp_com_on(__a_unused
struct sender_command_data
*scd
)
138 return generic_com_on(dss
, IPPROTO_DCCP
);
141 static int dccp_com_off(__a_unused
struct sender_command_data
*scd
)
143 generic_com_off(dss
);
148 static int dccp_com_deny(struct sender_command_data
*scd
)
150 generic_com_deny(scd
, dss
);
154 static int dccp_com_allow(struct sender_command_data
*scd
)
156 generic_com_allow(scd
, dss
);
161 * Return list of available CCIDs or warning, in static buffer.
163 static const char *dccp_list_available_ccids(void)
165 /* Worst case length: n * 3 digits + n-1 spaces + '\0' */
166 static char list
[DCCP_MAX_HOST_CCIDS
* 4];
170 nccids
= dccp_available_ccids(&ccids
);
172 snprintf(list
, sizeof(list
), "Unable to query available CCIDs");
174 for (i
= len
= 0; i
< nccids
; i
++)
175 len
+= snprintf(list
+ len
, sizeof(list
) - len
,
176 "%s%d", i
? " " : "", ccids
[i
]);
181 static char *dccp_info(void)
183 char *info
= get_sender_info(dss
, "dccp");
184 char *ret
= make_message("%s" "\tsupported ccids: %s\n",
185 info
, dccp_list_available_ccids());
191 * The init function of the dccp sender.
193 * \param s pointer to the dccp sender struct.
195 * It initializes all function pointers of \a s and starts
196 * listening on the given port.
198 void dccp_send_init(struct sender
*s
)
204 s
->pre_select
= dccp_pre_select
;
205 s
->post_select
= dccp_post_select
;
206 s
->shutdown_clients
= dccp_shutdown_clients
;
207 s
->help
= generic_sender_help
;
208 s
->client_cmds
[SENDER_ON
] = dccp_com_on
;
209 s
->client_cmds
[SENDER_OFF
] = dccp_com_off
;
210 s
->client_cmds
[SENDER_DENY
] = dccp_com_deny
;
211 s
->client_cmds
[SENDER_ALLOW
] = dccp_com_allow
;
212 s
->client_cmds
[SENDER_ADD
] = NULL
;
213 s
->client_cmds
[SENDER_DELETE
] = NULL
;
215 init_sender_status(dss
, conf
.dccp_access_arg
, conf
.dccp_access_given
,
216 conf
.dccp_port_arg
, conf
.dccp_max_clients_arg
,
217 conf
.dccp_default_deny_given
);
218 ret
= generic_com_on(dss
, IPPROTO_DCCP
);
220 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));