2 * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
6 /** \file udp_recv.c Paraslash's udp receiver */
10 #include <sys/socket.h>
15 #include "portable_io.h"
20 #include "udp_recv.cmdline.h"
24 #include "buffer_tree.h"
27 * Data specific to the udp receiver.
29 * \sa \ref receiver, \ref receiver_node.
31 struct private_udp_recv_data
{
32 /** The socket file descriptor. */
34 struct btr_pool
*btrp
;
37 static void udp_recv_pre_select(struct sched
*s
, struct task
*t
)
39 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
40 struct private_udp_recv_data
*purd
= rn
->private_data
;
42 if (generic_recv_pre_select(s
, t
) <= 0)
44 para_fd_set(purd
->fd
, &s
->rfds
, &s
->max_fileno
);
47 static int udp_check_eof(size_t sz
, struct iovec iov
[2])
49 if (sz
< FEC_EOF_PACKET_LEN
)
51 if (iov
[0].iov_len
>= FEC_EOF_PACKET_LEN
) {
52 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
,
53 FEC_EOF_PACKET_LEN
) != 0)
57 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
, iov
[0].iov_len
) != 0)
59 if (memcmp(iov
[1].iov_base
, FEC_EOF_PACKET
+ iov
[0].iov_len
,
60 FEC_EOF_PACKET_LEN
- iov
[0].iov_len
) != 0)
65 static void udp_recv_post_select(__a_unused
struct sched
*s
, struct task
*t
)
67 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
68 struct private_udp_recv_data
*purd
= rn
->private_data
;
69 struct btr_node
*btrn
= rn
->btrn
;
72 int ret
, readv_ret
, iovcnt
;
75 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
78 iovcnt
= btr_pool_get_buffers(purd
->btrp
, iov
);
82 ret
= readv_nonblock(purd
->fd
, iov
, iovcnt
, &s
->rfds
, &num_bytes
);
86 ret
= udp_check_eof(num_bytes
, iov
);
89 if (iov
[0].iov_len
>= num_bytes
)
90 btr_add_output_pool(purd
->btrp
, num_bytes
, btrn
);
91 else { /* both buffers contain data */
92 btr_add_output_pool(purd
->btrp
, iov
[0].iov_len
, btrn
);
93 btr_add_output_pool(purd
->btrp
, num_bytes
- iov
[0].iov_len
,
100 btr_remove_node(btrn
);
106 static void udp_recv_close(struct receiver_node
*rn
)
108 struct private_udp_recv_data
*purd
= rn
->private_data
;
112 btr_pool_free(purd
->btrp
);
113 free(rn
->private_data
);
116 static void *udp_recv_parse_config(int argc
, char **argv
)
119 struct udp_recv_args_info
*tmp
=
120 para_calloc(sizeof(struct udp_recv_args_info
));
122 ret
= udp_recv_cmdline_parser(argc
, argv
, tmp
)? -E_UDP_SYNTAX
: 1;
130 * Perform AF-independent joining of multicast receive addresses.
132 * \param fd Bound socket descriptor.
133 * \param iface The receiving multicast interface, or NULL for the default.
135 * \return Zero if okay, negative on error.
137 static int mcast_receiver_setup(int fd
, const char *iface
)
139 struct sockaddr_storage ss
;
140 socklen_t sslen
= sizeof(ss
);
141 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
143 if (getsockname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
145 assert(ss
.ss_family
== AF_INET
|| ss
.ss_family
== AF_INET6
);
147 if (iface
!= NULL
&& id
== 0)
148 PARA_WARNING_LOG("could not resolve interface %s, using default\n",
151 switch (ss
.ss_family
) {
153 if (IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
))) {
157 m4
.imr_address
.s_addr
= INADDR_ANY
;
162 m4
.imr_interface
.s_addr
= INADDR_ANY
;
164 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported\n");
167 m4
.imr_multiaddr
= ((struct sockaddr_in
*)&ss
)->sin_addr
;
169 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
,
170 &m4
, sizeof(m4
)) < 0)
175 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
)) {
178 memset(&m6
, 0, sizeof(m6
));
179 memcpy(&m6
.ipv6mr_multiaddr
, &((struct sockaddr_in6
*)&ss
)->sin6_addr
, 16);
180 m6
.ipv6mr_interface
= id
;
181 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
, &m6
, sizeof(m6
)) < 0)
187 return -ERRNO_TO_PARA_ERROR(errno
);
190 static int udp_recv_open(struct receiver_node
*rn
)
192 struct private_udp_recv_data
*purd
;
193 struct udp_recv_args_info
*c
= rn
->conf
;
194 char *iface
= c
->iface_given
? c
->iface_arg
: NULL
;
197 rn
->private_data
= para_calloc(sizeof(struct private_udp_recv_data
));
198 purd
= rn
->private_data
;
200 ret
= makesock(IPPROTO_UDP
, 1, c
->host_arg
, c
->port_arg
, NULL
);
205 ret
= mcast_receiver_setup(purd
->fd
, iface
);
211 ret
= mark_fd_nonblocking(purd
->fd
);
216 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c
->host_arg
,
217 c
->port_arg
, purd
->fd
);
218 purd
->btrp
= btr_pool_new("udp_recv", 320 * 1024);
221 free(rn
->private_data
);
225 static void udp_recv_free_config(void *conf
)
227 udp_recv_cmdline_parser_free(conf
);
232 * The init function of the udp receiver.
234 * \param r Pointer to the receiver struct to initialize.
236 * Initialize all function pointers of \a r.
238 void udp_recv_init(struct receiver
*r
)
240 struct udp_recv_args_info dummy
;
242 udp_recv_cmdline_parser_init(&dummy
);
243 r
->open
= udp_recv_open
;
244 r
->close
= udp_recv_close
;
245 r
->pre_select
= udp_recv_pre_select
;
246 r
->post_select
= udp_recv_post_select
;
247 r
->parse_config
= udp_recv_parse_config
;
248 r
->free_config
= udp_recv_free_config
;
249 r
->help
= (struct ggo_help
) {
250 .short_help
= udp_recv_args_info_help
,
251 .detailed_help
= udp_recv_args_info_detailed_help
253 udp_recv_cmdline_parser_free(&dummy
);