2 * Copyright (C) 2006-2013 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>
14 #include <netinet/in.h>
15 #include <sys/socket.h>
17 #include <sys/types.h>
18 #include <arpa/inet.h>
27 #include "buffer_tree.h"
33 #include "dccp_recv.cmdline.h"
35 static void dccp_recv_close(struct receiver_node
*rn
)
39 btr_pool_free(rn
->btrp
);
42 static int dccp_recv_open(struct receiver_node
*rn
)
44 struct dccp_recv_args_info
*conf
= rn
->conf
;
45 struct flowopts
*fo
= NULL
;
46 uint8_t *ccids
= NULL
;
49 /* Copy CCID preference list (u8 array required) */
50 if (conf
->ccid_given
) {
51 ccids
= para_malloc(conf
->ccid_given
);
54 for (i
= 0; i
< conf
->ccid_given
; i
++)
55 ccids
[i
] = conf
->ccid_arg
[i
];
57 OPT_ADD(fo
, SOL_DCCP
, DCCP_SOCKOPT_CCID
, ccids
, i
);
60 fd
= makesock(IPPROTO_DCCP
, 0, conf
->host_arg
, conf
->port_arg
, fo
);
65 * Disable unused CCIDs: the receiver does not send any application
66 * data to the server. By shutting down this unused path we reduce
67 * internal processing costs, as the unused CCIDs (in the kernel) are
70 if (shutdown(fd
, SHUT_WR
) < 0) {
71 ret
= -ERRNO_TO_PARA_ERROR(errno
);
74 ret
= mark_fd_nonblocking(fd
);
77 rn
->btrp
= btr_pool_new("dccp_recv", 320 * 1024);
86 * Check whether the host supports the requested 'ccid' arguments.
87 * \param conf DCCP receiver arguments.
88 * \return True if all CCIDs requested in \a conf are supported.
90 static bool dccp_recv_ccid_support_check(struct dccp_recv_args_info
*conf
)
95 nccids
= dccp_available_ccids(&ccids
);
99 for (i
= 0; i
< conf
->ccid_given
; i
++) {
100 for (j
= 0; j
< nccids
&& ccids
[j
] != conf
->ccid_arg
[i
]; j
++)
103 PARA_ERROR_LOG("'CCID-%d' not supported on this host.\n",
111 static void *dccp_recv_parse_config(int argc
, char **argv
)
113 struct dccp_recv_args_info
*tmp
= para_calloc(sizeof(*tmp
));
115 dccp_recv_cmdline_parser(argc
, argv
, tmp
);
116 if (!dccp_recv_ccid_support_check(tmp
))
121 static void dccp_recv_pre_select(struct sched
*s
, struct task
*t
)
123 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
126 if (generic_recv_pre_select(s
, t
) <= 0)
128 para_fd_set(rn
->fd
, &s
->rfds
, &s
->max_fileno
);
131 static int dccp_recv_post_select(struct sched
*s
, struct task
*t
)
133 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
134 struct btr_node
*btrn
= rn
->btrn
;
139 ret
= task_get_notification(t
);
142 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
145 iovcnt
= btr_pool_get_buffers(rn
->btrp
, iov
);
146 ret
= -E_DCCP_OVERRUN
;
149 ret
= readv_nonblock(rn
->fd
, iov
, iovcnt
, &s
->rfds
, &num_bytes
);
152 if (num_bytes
<= iov
[0].iov_len
) /* only the first buffer was filled */
153 btr_add_output_pool(rn
->btrp
, num_bytes
, btrn
);
154 else { /* both buffers contain data */
155 btr_add_output_pool(rn
->btrp
, iov
[0].iov_len
, btrn
);
156 btr_add_output_pool(rn
->btrp
, num_bytes
- iov
[0].iov_len
, btrn
);
160 btr_remove_node(&rn
->btrn
);
164 static void dccp_recv_free_config(void *conf
)
166 dccp_recv_cmdline_parser_free(conf
);
171 * The init function of the dccp receiver.
173 * \param r Pointer to the receiver struct to initialize.
175 * Initialize all function pointers of \a r.
177 void dccp_recv_init(struct receiver
*r
)
179 struct dccp_recv_args_info dummy
;
181 dccp_recv_cmdline_parser_init(&dummy
);
182 r
->open
= dccp_recv_open
;
183 r
->close
= dccp_recv_close
;
184 r
->pre_select
= dccp_recv_pre_select
;
185 r
->post_select
= dccp_recv_post_select
;
186 r
->parse_config
= dccp_recv_parse_config
;
187 r
->free_config
= dccp_recv_free_config
;
188 r
->help
= (struct ggo_help
)DEFINE_GGO_HELP(dccp_recv
);
189 dccp_recv_cmdline_parser_free(&dummy
);