2 * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file dccp_recv.c paraslash's dccp receiver */
10 * based on client.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
15 #include <sys/types.h>
26 #include "buffer_tree.h"
28 #include "dccp_recv.cmdline.h"
31 * data specific to the dccp receiver
33 * \sa receiver receiver_node
35 struct private_dccp_recv_data
{
36 /** the file descriptor for the dccp socket */
38 struct btr_pool
*btrp
;
41 static void dccp_recv_close(struct receiver_node
*rn
)
43 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
49 btr_pool_free(pdd
->btrp
);
51 rn
->private_data
= NULL
;
54 static int dccp_recv_open(struct receiver_node
*rn
)
56 struct private_dccp_recv_data
*pdd
;
57 struct dccp_recv_args_info
*conf
= rn
->conf
;
58 struct flowopts
*fo
= NULL
;
59 uint8_t *ccids
= NULL
;
62 /* Copy CCID preference list (u8 array required) */
63 if (conf
->ccid_given
) {
64 ccids
= para_malloc(conf
->ccid_given
);
67 for (i
= 0; i
< conf
->ccid_given
; i
++)
68 ccids
[i
] = conf
->ccid_arg
[i
];
70 OPT_ADD(fo
, SOL_DCCP
, DCCP_SOCKOPT_CCID
, ccids
, i
);
73 fd
= makesock(IPPROTO_DCCP
, 0, conf
->host_arg
, conf
->port_arg
, fo
);
78 * Disable unused CCIDs: the receiver does not send any application
79 * data to the server. By shutting down this unused path we reduce
80 * internal processing costs, as the unused CCIDs (in the kernel) are
83 if (shutdown(fd
, SHUT_WR
) < 0) {
84 ret
= -ERRNO_TO_PARA_ERROR(errno
);
87 ret
= mark_fd_nonblocking(fd
);
90 rn
->private_data
= pdd
= para_calloc(sizeof(struct private_dccp_recv_data
));
91 pdd
->btrp
= btr_pool_new("dccp_recv", 320 * 1024);
100 * Check whether the host supports the requested 'ccid' arguments.
101 * \param conf DCCP receiver arguments.
102 * \return True if all CCIDs requested in \a conf are supported.
104 static bool dccp_recv_ccid_support_check(struct dccp_recv_args_info
*conf
)
109 nccids
= dccp_available_ccids(&ccids
);
113 for (i
= 0; i
< conf
->ccid_given
; i
++) {
114 for (j
= 0; j
< nccids
&& ccids
[j
] != conf
->ccid_arg
[i
]; j
++)
117 PARA_ERROR_LOG("'CCID-%d' not supported on this host.\n",
125 static void *dccp_recv_parse_config(int argc
, char **argv
)
127 struct dccp_recv_args_info
*tmp
= para_calloc(sizeof(*tmp
));
129 if (!dccp_recv_cmdline_parser(argc
, argv
, tmp
) &&
130 dccp_recv_ccid_support_check(tmp
))
136 static void dccp_recv_pre_select(struct sched
*s
, struct task
*t
)
138 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
139 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
142 if (generic_recv_pre_select(s
, t
) <= 0)
144 para_fd_set(pdd
->fd
, &s
->rfds
, &s
->max_fileno
);
147 static void dccp_recv_post_select(struct sched
*s
, struct task
*t
)
149 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
150 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
151 struct btr_node
*btrn
= rn
->btrn
;
156 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
159 iovcnt
= btr_pool_get_buffers(pdd
->btrp
, iov
);
160 ret
= -E_DCCP_OVERRUN
;
163 ret
= readv_nonblock(pdd
->fd
, iov
, iovcnt
, &s
->rfds
, &num_bytes
);
166 if (num_bytes
<= iov
[0].iov_len
) /* only the first buffer was filled */
167 btr_add_output_pool(pdd
->btrp
, num_bytes
, btrn
);
168 else { /* both buffers contain data */
169 btr_add_output_pool(pdd
->btrp
, iov
[0].iov_len
, btrn
);
170 btr_add_output_pool(pdd
->btrp
, num_bytes
- iov
[0].iov_len
, btrn
);
175 btr_remove_node(rn
->btrn
);
179 static void dccp_recv_free_config(void *conf
)
181 dccp_recv_cmdline_parser_free(conf
);
186 * The init function of the dccp receiver.
188 * \param r Pointer to the receiver struct to initialize.
190 * Initialize all function pointers of \a r.
192 void dccp_recv_init(struct receiver
*r
)
194 struct dccp_recv_args_info dummy
;
196 dccp_recv_cmdline_parser_init(&dummy
);
197 r
->open
= dccp_recv_open
;
198 r
->close
= dccp_recv_close
;
199 r
->pre_select
= dccp_recv_pre_select
;
200 r
->post_select
= dccp_recv_post_select
;
201 r
->parse_config
= dccp_recv_parse_config
;
202 r
->free_config
= dccp_recv_free_config
;
203 r
->help
= (struct ggo_help
) {
204 .short_help
= dccp_recv_args_info_help
,
205 .detailed_help
= dccp_recv_args_info_detailed_help
207 dccp_recv_cmdline_parser_free(&dummy
);