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"
33 /** the list of connected clients **/
34 static struct list_head clients
;
35 /** The whitelist/blacklist. */
36 static struct list_head dccp_acl
;
37 static int listen_fd
= -1;
39 /** Maximal number of bytes in a chunk queue. */
40 #define DCCP_MAX_PENDING_BYTES 40000
42 /** Do not write more than that many bytes at once. */
43 #define DCCP_MAX_BYTES_PER_WRITE 1024
45 static void dccp_pre_select(int *max_fileno
, fd_set
*rfds
,
46 __a_unused fd_set
*wfds
)
49 para_fd_set(listen_fd
, rfds
, max_fileno
);
52 static void dccp_post_select(fd_set
*rfds
, __a_unused fd_set
*wfds
)
54 struct sender_client
*sc
;
57 if (listen_fd
< 0 || !FD_ISSET(listen_fd
, rfds
))
59 ret
= para_accept(listen_fd
, NULL
, 0);
61 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
66 * Bypass unused CCID paths: the sender does not receive application data
67 * from the client; by shutting down this unused communication path we can
68 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
70 if (shutdown(fd
, SHUT_RD
) < 0) {
71 ret
= -ERRNO_TO_PARA_ERROR(errno
);
74 ret
= mark_fd_nonblocking(fd
);
77 ret
= acl_check_access(fd
, &dccp_acl
, conf
.dccp_default_deny_given
);
80 sc
= para_calloc(sizeof(*sc
));
82 sc
->name
= make_message("%s", remote_name(sc
->fd
));
83 PARA_NOTICE_LOG("connection from %s\n", sc
->name
);
84 para_list_add(&sc
->node
, &clients
);
85 add_close_on_fork_list(sc
->fd
);
86 sc
->cq
= cq_new(DCCP_MAX_PENDING_BYTES
);
89 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
93 static void dccp_send(long unsigned current_chunk
,
94 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
96 struct sender_client
*sc
, *tmp
;
98 list_for_each_entry_safe(sc
, tmp
, &clients
, node
)
99 send_chunk(sc
, DCCP_MAX_BYTES_PER_WRITE
, current_chunk
, buf
,
103 static void dccp_shutdown_clients(void)
105 struct sender_client
*sc
, *tmp
;
107 list_for_each_entry_safe(sc
, tmp
, &clients
, node
)
111 static int dccp_com_deny(struct sender_command_data
*scd
)
113 acl_deny(scd
->addr
, scd
->netmask
, &dccp_acl
,
114 conf
.dccp_default_deny_given
);
118 static int dccp_com_allow(struct sender_command_data
*scd
)
120 acl_allow(scd
->addr
, scd
->netmask
, &dccp_acl
,
121 conf
.dccp_default_deny_given
);
125 static char *dccp_info(void)
128 struct sender_client
*sc
, *tmp
;
130 list_for_each_entry_safe(sc
, tmp
, &clients
, node
)
132 return make_message("dccp connected clients: %d\n", num_clients
);
135 static char *dccp_help(void)
137 return make_message("no help available\n");
141 * The init function of the dccp sender.
143 * \param s pointer to the dccp sender struct.
145 * It initializes all function pointers of \a s and starts
146 * listening on the given port.
148 void dccp_send_init(struct sender
*s
)
152 INIT_LIST_HEAD(&clients
);
155 s
->pre_select
= dccp_pre_select
;
156 s
->post_select
= dccp_post_select
;
157 s
->shutdown_clients
= dccp_shutdown_clients
;
159 s
->client_cmds
[SENDER_ON
] = NULL
;
160 s
->client_cmds
[SENDER_OFF
] = NULL
;
161 s
->client_cmds
[SENDER_DENY
] = dccp_com_deny
;
162 s
->client_cmds
[SENDER_ALLOW
] = dccp_com_allow
;
163 s
->client_cmds
[SENDER_ADD
] = NULL
;
164 s
->client_cmds
[SENDER_DELETE
] = NULL
;
165 acl_init(&dccp_acl
, conf
.dccp_access_arg
, conf
.dccp_access_given
);
166 ret
= open_sender(IPPROTO_DCCP
, conf
.dccp_port_arg
);
168 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));