2 * Copyright (C) 2005-2009 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
;
75 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
80 if (!FD_ISSET(purd
->fd
, &s
->rfds
))
82 iovcnt
= btr_pool_get_buffers(purd
->btrp
, iov
);
86 ret
= para_readv(purd
->fd
, iov
, iovcnt
);
87 /* EAGAIN is possible even if FD_ISSET */
88 if (ret
< 0 && is_errno(-ret
, EAGAIN
))
95 ret
= udp_check_eof(packet_size
, iov
);
98 if (iov
[0].iov_len
>= packet_size
)
99 btr_add_output_pool(purd
->btrp
, packet_size
, btrn
);
100 else { /* both buffers contain data */
101 btr_add_output_pool(purd
->btrp
, iov
[0].iov_len
, btrn
);
102 btr_add_output_pool(purd
->btrp
, packet_size
- iov
[0].iov_len
,
107 btr_remove_node(btrn
);
113 static void udp_recv_close(struct receiver_node
*rn
)
115 struct private_udp_recv_data
*purd
= rn
->private_data
;
119 btr_pool_free(purd
->btrp
);
120 free(rn
->private_data
);
123 static void *udp_recv_parse_config(int argc
, char **argv
)
126 struct udp_recv_args_info
*tmp
=
127 para_calloc(sizeof(struct udp_recv_args_info
));
129 ret
= udp_recv_cmdline_parser(argc
, argv
, tmp
)? -E_UDP_SYNTAX
: 1;
137 * Perform AF-independent joining of multicast receive addresses.
139 * \param fd Bound socket descriptor.
140 * \param iface The receiving multicast interface, or NULL for the default.
142 * \return Zero if okay, negative on error.
144 static int mcast_receiver_setup(int fd
, const char *iface
)
146 struct sockaddr_storage ss
;
147 socklen_t sslen
= sizeof(ss
);
148 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
150 if (getsockname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
153 if (iface
!= NULL
&& id
== 0)
154 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
156 switch (ss
.ss_family
) {
158 if (IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
))) {
162 m4
.imr_address
.s_addr
= INADDR_ANY
;
167 m4
.imr_interface
.s_addr
= INADDR_ANY
;
169 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
172 m4
.imr_multiaddr
= ((struct sockaddr_in
*)&ss
)->sin_addr
;
174 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &m4
, sizeof(m4
)) < 0)
179 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
)) {
182 memset(&m6
, 0, sizeof(m6
));
183 memcpy(&m6
.ipv6mr_multiaddr
, &((struct sockaddr_in6
*)&ss
)->sin6_addr
, 16);
184 m6
.ipv6mr_interface
= id
;
185 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
, &m6
, sizeof(m6
)) < 0)
190 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
191 return -E_ADDRESS_LOOKUP
;
194 return -ERRNO_TO_PARA_ERROR(errno
);
197 static int udp_recv_open(struct receiver_node
*rn
)
199 struct private_udp_recv_data
*purd
;
200 struct udp_recv_args_info
*c
= rn
->conf
;
201 char *iface
= c
->iface_given
? c
->iface_arg
: NULL
;
204 rn
->private_data
= para_calloc(sizeof(struct private_udp_recv_data
));
205 purd
= rn
->private_data
;
207 ret
= makesock(IPPROTO_UDP
, 1, c
->host_arg
, c
->port_arg
, NULL
);
212 ret
= mcast_receiver_setup(purd
->fd
, iface
);
218 ret
= mark_fd_nonblocking(purd
->fd
);
223 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c
->host_arg
,
224 c
->port_arg
, purd
->fd
);
225 purd
->btrp
= btr_pool_new("udp_recv", 320 * 1024);
228 free(rn
->private_data
);
232 static void udp_recv_free_config(void *conf
)
234 udp_recv_cmdline_parser_free(conf
);
239 * The init function of the udp receiver.
241 * \param r Pointer to the receiver struct to initialize.
243 * Initialize all function pointers of \a r.
245 void udp_recv_init(struct receiver
*r
)
247 struct udp_recv_args_info dummy
;
249 udp_recv_cmdline_parser_init(&dummy
);
250 r
->open
= udp_recv_open
;
251 r
->close
= udp_recv_close
;
252 r
->pre_select
= udp_recv_pre_select
;
253 r
->post_select
= udp_recv_post_select
;
254 r
->parse_config
= udp_recv_parse_config
;
255 r
->free_config
= udp_recv_free_config
;
256 r
->help
= (struct ggo_help
) {
257 .short_help
= udp_recv_args_info_help
,
258 .detailed_help
= udp_recv_args_info_detailed_help
260 udp_recv_cmdline_parser_free(&dummy
);