2 * Copyright (C) 2005-2012 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 */
9 #include <sys/socket.h>
14 #include "portable_io.h"
18 #include "buffer_tree.h"
20 #include "udp_recv.cmdline.h"
25 static void udp_recv_pre_select(struct sched
*s
, struct task
*t
)
27 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
29 if (generic_recv_pre_select(s
, t
) <= 0)
31 para_fd_set(rn
->fd
, &s
->rfds
, &s
->max_fileno
);
34 static int udp_check_eof(size_t sz
, struct iovec iov
[2])
36 if (sz
< FEC_EOF_PACKET_LEN
)
38 if (iov
[0].iov_len
>= FEC_EOF_PACKET_LEN
) {
39 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
,
40 FEC_EOF_PACKET_LEN
) != 0)
44 if (memcmp(iov
[0].iov_base
, FEC_EOF_PACKET
, iov
[0].iov_len
) != 0)
46 if (memcmp(iov
[1].iov_base
, FEC_EOF_PACKET
+ iov
[0].iov_len
,
47 FEC_EOF_PACKET_LEN
- iov
[0].iov_len
) != 0)
52 static void udp_recv_post_select(__a_unused
struct sched
*s
, struct task
*t
)
54 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
55 struct btr_node
*btrn
= rn
->btrn
;
58 int ret
, readv_ret
, iovcnt
;
60 ret
= task_get_notification(t
);
63 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
66 iovcnt
= btr_pool_get_buffers(rn
->btrp
, iov
);
70 ret
= readv_nonblock(rn
->fd
, iov
, iovcnt
, &s
->rfds
, &num_bytes
);
74 ret
= udp_check_eof(num_bytes
, iov
);
77 if (iov
[0].iov_len
>= num_bytes
)
78 btr_add_output_pool(rn
->btrp
, num_bytes
, btrn
);
79 else { /* both buffers contain data */
80 btr_add_output_pool(rn
->btrp
, iov
[0].iov_len
, btrn
);
81 btr_add_output_pool(rn
->btrp
, num_bytes
- iov
[0].iov_len
,
88 btr_remove_node(&rn
->btrn
);
94 static void udp_recv_close(struct receiver_node
*rn
)
98 btr_pool_free(rn
->btrp
);
101 static void *udp_recv_parse_config(int argc
, char **argv
)
104 struct udp_recv_args_info
*tmp
=
105 para_calloc(sizeof(struct udp_recv_args_info
));
107 ret
= udp_recv_cmdline_parser(argc
, argv
, tmp
)? -E_UDP_SYNTAX
: 1;
115 * Perform AF-independent joining of multicast receive addresses.
117 * \param fd Bound socket descriptor.
118 * \param iface The receiving multicast interface, or NULL for the default.
120 * \return Zero if okay, negative on error.
122 static int mcast_receiver_setup(int fd
, const char *iface
)
124 struct sockaddr_storage ss
;
125 socklen_t sslen
= sizeof(ss
);
126 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
128 if (getsockname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
130 assert(ss
.ss_family
== AF_INET
|| ss
.ss_family
== AF_INET6
);
132 if (iface
!= NULL
&& id
== 0)
133 PARA_WARNING_LOG("could not resolve interface %s, using default\n",
136 switch (ss
.ss_family
) {
138 if (IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
))) {
142 m4
.imr_address
.s_addr
= INADDR_ANY
;
147 m4
.imr_interface
.s_addr
= INADDR_ANY
;
149 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported\n");
152 m4
.imr_multiaddr
= ((struct sockaddr_in
*)&ss
)->sin_addr
;
154 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
,
155 &m4
, sizeof(m4
)) < 0)
160 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
)) {
163 memset(&m6
, 0, sizeof(m6
));
164 memcpy(&m6
.ipv6mr_multiaddr
, &((struct sockaddr_in6
*)&ss
)->sin6_addr
, 16);
165 m6
.ipv6mr_interface
= id
;
166 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
, &m6
, sizeof(m6
)) < 0)
172 return -ERRNO_TO_PARA_ERROR(errno
);
175 static int udp_recv_open(struct receiver_node
*rn
)
177 struct udp_recv_args_info
*c
= rn
->conf
;
178 char *iface
= c
->iface_given
? c
->iface_arg
: NULL
;
181 ret
= makesock(IPPROTO_UDP
, 1, c
->host_arg
, c
->port_arg
, NULL
);
186 ret
= mcast_receiver_setup(rn
->fd
, iface
);
192 ret
= mark_fd_nonblocking(rn
->fd
);
197 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c
->host_arg
,
198 c
->port_arg
, rn
->fd
);
199 rn
->btrp
= btr_pool_new("udp_recv", 320 * 1024);
205 static void udp_recv_free_config(void *conf
)
207 udp_recv_cmdline_parser_free(conf
);
212 * The init function of the udp receiver.
214 * \param r Pointer to the receiver struct to initialize.
216 * Initialize all function pointers of \a r.
218 void udp_recv_init(struct receiver
*r
)
220 struct udp_recv_args_info dummy
;
222 udp_recv_cmdline_parser_init(&dummy
);
223 r
->open
= udp_recv_open
;
224 r
->close
= udp_recv_close
;
225 r
->pre_select
= udp_recv_pre_select
;
226 r
->post_select
= udp_recv_post_select
;
227 r
->parse_config
= udp_recv_parse_config
;
228 r
->free_config
= udp_recv_free_config
;
229 r
->help
= (struct ggo_help
) {
230 .short_help
= udp_recv_args_info_help
,
231 .detailed_help
= udp_recv_args_info_detailed_help
233 udp_recv_cmdline_parser_free(&dummy
);