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
;
35 struct timeval last_read_time
;
38 static void udp_recv_pre_select(struct sched
*s
, struct task
*t
)
40 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
41 struct private_udp_recv_data
*purd
= rn
->private_data
;
43 if (generic_recv_pre_select(s
, t
) <= 0)
45 para_fd_set(purd
->fd
, &s
->rfds
, &s
->max_fileno
);
48 static int udp_check_eof(size_t sz
, struct iovec iov
[2])
50 if (sz
< FEC_EOF_PACKET_LEN
)
52 if (iov
[0].iov_len
>= FEC_EOF_PACKET_LEN
) {
53 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
,
54 FEC_EOF_PACKET_LEN
) != 0)
58 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
, iov
[0].iov_len
) != 0)
60 if (memcmp(iov
[1].iov_base
, FEC_EOF_PACKET
+ iov
[0].iov_len
,
61 FEC_EOF_PACKET_LEN
- iov
[0].iov_len
) != 0)
66 static void udp_recv_post_select(__a_unused
struct sched
*s
, struct task
*t
)
68 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
69 struct private_udp_recv_data
*purd
= rn
->private_data
;
70 struct btr_node
*btrn
= rn
->btrn
;
76 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
81 if (!FD_ISSET(purd
->fd
, &s
->rfds
)) {
83 tv_add(&purd
->last_read_time
, &(struct timeval
)EMBRACE(5, 0),
86 if (tv_diff(now
, &tmp
, NULL
) > 0)
90 iovcnt
= btr_pool_get_buffers(purd
->btrp
, iov
);
94 ret
= para_readv(purd
->fd
, iov
, iovcnt
);
95 /* EAGAIN is possible even if FD_ISSET */
96 if (ret
< 0 && is_errno(-ret
, EAGAIN
))
103 ret
= udp_check_eof(packet_size
, iov
);
106 purd
->last_read_time
= *now
;
107 if (iov
[0].iov_len
>= packet_size
)
108 btr_add_output_pool(purd
->btrp
, packet_size
, btrn
);
109 else { /* both buffers contain data */
110 btr_add_output_pool(purd
->btrp
, iov
[0].iov_len
, btrn
);
111 btr_add_output_pool(purd
->btrp
, packet_size
- iov
[0].iov_len
,
116 btr_remove_node(btrn
);
122 static void udp_recv_close(struct receiver_node
*rn
)
124 struct private_udp_recv_data
*purd
= rn
->private_data
;
128 btr_pool_free(purd
->btrp
);
129 free(rn
->private_data
);
132 static void *udp_recv_parse_config(int argc
, char **argv
)
135 struct udp_recv_args_info
*tmp
=
136 para_calloc(sizeof(struct udp_recv_args_info
));
138 ret
= udp_recv_cmdline_parser(argc
, argv
, tmp
)? -E_UDP_SYNTAX
: 1;
146 * Perform AF-independent joining of multicast receive addresses.
148 * \param fd Bound socket descriptor.
149 * \param iface The receiving multicast interface, or NULL for the default.
151 * \return Zero if okay, negative on error.
153 static int mcast_receiver_setup(int fd
, const char *iface
)
155 struct sockaddr_storage ss
;
156 socklen_t sslen
= sizeof(ss
);
157 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
159 if (getsockname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
162 if (iface
!= NULL
&& id
== 0)
163 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
165 switch (ss
.ss_family
) {
167 if (IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
))) {
171 m4
.imr_address
.s_addr
= INADDR_ANY
;
176 m4
.imr_interface
.s_addr
= INADDR_ANY
;
178 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
181 m4
.imr_multiaddr
= ((struct sockaddr_in
*)&ss
)->sin_addr
;
183 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &m4
, sizeof(m4
)) < 0)
188 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
)) {
191 memset(&m6
, 0, sizeof(m6
));
192 memcpy(&m6
.ipv6mr_multiaddr
, &((struct sockaddr_in6
*)&ss
)->sin6_addr
, 16);
193 m6
.ipv6mr_interface
= id
;
194 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
, &m6
, sizeof(m6
)) < 0)
199 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
200 return -E_ADDRESS_LOOKUP
;
203 return -ERRNO_TO_PARA_ERROR(errno
);
206 static int udp_recv_open(struct receiver_node
*rn
)
208 struct private_udp_recv_data
*purd
;
209 struct udp_recv_args_info
*c
= rn
->conf
;
210 char *iface
= c
->iface_given
? c
->iface_arg
: NULL
;
213 rn
->private_data
= para_calloc(sizeof(struct private_udp_recv_data
));
214 purd
= rn
->private_data
;
216 ret
= makesock(IPPROTO_UDP
, 1, c
->host_arg
, c
->port_arg
, NULL
);
221 ret
= mcast_receiver_setup(purd
->fd
, iface
);
227 ret
= mark_fd_nonblocking(purd
->fd
);
232 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c
->host_arg
,
233 c
->port_arg
, purd
->fd
);
234 purd
->btrp
= btr_pool_new("udp_recv", 320 * 1024);
235 purd
->last_read_time
= *now
;
238 free(rn
->private_data
);
242 static void udp_recv_free_config(void *conf
)
244 udp_recv_cmdline_parser_free(conf
);
249 * The init function of the udp receiver.
251 * \param r Pointer to the receiver struct to initialize.
253 * Initialize all function pointers of \a r.
255 void udp_recv_init(struct receiver
*r
)
257 struct udp_recv_args_info dummy
;
259 udp_recv_cmdline_parser_init(&dummy
);
260 r
->open
= udp_recv_open
;
261 r
->close
= udp_recv_close
;
262 r
->pre_select
= udp_recv_pre_select
;
263 r
->post_select
= udp_recv_post_select
;
264 r
->parse_config
= udp_recv_parse_config
;
265 r
->free_config
= udp_recv_free_config
;
266 r
->help
= (struct ggo_help
) {
267 .short_help
= udp_recv_args_info_help
,
268 .detailed_help
= udp_recv_args_info_detailed_help
270 udp_recv_cmdline_parser_free(&dummy
);