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
)
44 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
46 if (pdd
&& pdd
->fd
> 0)
48 btr_pool_free(pdd
->btrp
);
49 free(rn
->private_data
);
50 rn
->private_data
= NULL
;
53 static int dccp_recv_open(struct receiver_node
*rn
)
55 struct private_dccp_recv_data
*pdd
;
56 struct dccp_recv_args_info
*conf
= rn
->conf
;
57 struct flowopts
*fo
= NULL
;
58 uint8_t *ccids
= NULL
;
61 /* Copy CCID preference list (u8 array required) */
62 if (conf
->ccid_given
) {
63 ccids
= para_malloc(conf
->ccid_given
);
66 for (i
= 0; i
< conf
->ccid_given
; i
++)
67 ccids
[i
] = conf
->ccid_arg
[i
];
69 OPT_ADD(fo
, SOL_DCCP
, DCCP_SOCKOPT_CCID
, ccids
, i
);
72 fd
= makesock(IPPROTO_DCCP
, 0, conf
->host_arg
, conf
->port_arg
, fo
);
77 * Disable unused CCIDs: the receiver does not send any application
78 * data to the server. By shutting down this unused path we reduce
79 * internal processing costs, as the unused CCIDs (in the kernel) are
82 if (shutdown(fd
, SHUT_WR
) < 0) {
83 ret
= -ERRNO_TO_PARA_ERROR(errno
);
86 ret
= mark_fd_nonblocking(fd
);
89 rn
->private_data
= pdd
= para_calloc(sizeof(struct private_dccp_recv_data
));
90 pdd
->btrp
= btr_pool_new("dccp_recv", 320 * 1024);
99 * Check whether the host supports the requested 'ccid' arguments.
100 * \param conf DCCP receiver arguments.
101 * \return True if all CCIDs requested in \a conf are supported.
103 static bool dccp_recv_ccid_support_check(struct dccp_recv_args_info
*conf
)
108 nccids
= dccp_available_ccids(&ccids
);
112 for (i
= 0; i
< conf
->ccid_given
; i
++) {
113 for (j
= 0; j
< nccids
&& ccids
[j
] != conf
->ccid_arg
[i
]; j
++)
116 PARA_ERROR_LOG("'CCID-%d' not supported on this host.\n",
124 static void *dccp_recv_parse_config(int argc
, char **argv
)
126 struct dccp_recv_args_info
*tmp
= para_calloc(sizeof(*tmp
));
128 if (!dccp_recv_cmdline_parser(argc
, argv
, tmp
) &&
129 dccp_recv_ccid_support_check(tmp
))
135 static void dccp_recv_pre_select(struct sched
*s
, struct task
*t
)
137 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
138 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
141 if (generic_recv_pre_select(s
, t
) <= 0)
143 para_fd_set(pdd
->fd
, &s
->rfds
, &s
->max_fileno
);
146 static void dccp_recv_post_select(struct sched
*s
, struct task
*t
)
148 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
149 struct private_dccp_recv_data
*pdd
= rn
->private_data
;
150 struct btr_node
*btrn
= rn
->btrn
;
155 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
158 iovcnt
= btr_pool_get_buffers(pdd
->btrp
, iov
);
159 ret
= -E_DCCP_OVERRUN
;
162 ret
= readv_nonblock(pdd
->fd
, iov
, iovcnt
, &s
->rfds
, &num_bytes
);
165 if (num_bytes
<= iov
[0].iov_len
) /* only the first buffer was filled */
166 btr_add_output_pool(pdd
->btrp
, num_bytes
, btrn
);
167 else { /* both buffers contain data */
168 btr_add_output_pool(pdd
->btrp
, iov
[0].iov_len
, btrn
);
169 btr_add_output_pool(pdd
->btrp
, num_bytes
- iov
[0].iov_len
, btrn
);
174 btr_remove_node(rn
->btrn
);
178 static void dccp_recv_free_config(void *conf
)
180 dccp_recv_cmdline_parser_free(conf
);
185 * The init function of the dccp receiver.
187 * \param r Pointer to the receiver struct to initialize.
189 * Initialize all function pointers of \a r.
191 void dccp_recv_init(struct receiver
*r
)
193 struct dccp_recv_args_info dummy
;
195 dccp_recv_cmdline_parser_init(&dummy
);
196 r
->open
= dccp_recv_open
;
197 r
->close
= dccp_recv_close
;
198 r
->pre_select
= dccp_recv_pre_select
;
199 r
->post_select
= dccp_recv_post_select
;
200 r
->parse_config
= dccp_recv_parse_config
;
201 r
->free_config
= dccp_recv_free_config
;
202 r
->help
= (struct ggo_help
) {
203 .short_help
= dccp_recv_args_info_help
,
204 .detailed_help
= dccp_recv_args_info_detailed_help
206 dccp_recv_cmdline_parser_free(&dummy
);