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 */
9 #include <sys/socket.h>
14 #include "portable_io.h"
19 #include "udp_recv.cmdline.h"
25 /** The size of the receiver node buffer. */
26 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
28 * Data specific to the udp receiver.
30 * \sa \ref receiver, \ref receiver_node.
32 struct private_udp_recv_data {
33 /** The socket file descriptor. */
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 para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
45 static int enough_space(size_t nbytes, size_t loaded)
47 return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
50 static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
54 if (!enough_space(len, rn->loaded))
55 return -E_UDP_OVERRUN;
56 memcpy(rn->buf + rn->loaded, buf, len);
61 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
63 struct receiver_node *rn = container_of(t, struct receiver_node, task);
64 struct private_udp_recv_data *purd = rn->private_data;
66 char tmpbuf[UDP_RECV_CHUNK_SIZE];
69 if (rn->output_error && *rn->output_error < 0) {
70 t->error = *rn->output_error;
73 if (!FD_ISSET(purd->fd, &s->rfds))
75 ret = recv_bin_buffer(purd->fd, tmpbuf, UDP_RECV_CHUNK_SIZE);
77 if (is_errno(ret, EINTR) || is_errno(ret, EAGAIN))
82 t->error = -E_RECV_EOF;
86 if (packet_size >= FEC_EOF_PACKET_LEN)
87 if (!memcmp(tmpbuf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
89 t->error = add_rn_output(rn, tmpbuf, packet_size);
96 static void udp_shutdown(void)
101 static void udp_recv_close(struct receiver_node *rn)
103 struct private_udp_recv_data *purd = rn->private_data;
107 free(rn->private_data);
111 static void *udp_recv_parse_config(int argc, char **argv)
114 struct udp_recv_args_info *tmp =
115 para_calloc(sizeof(struct udp_recv_args_info));
117 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
125 * Perform AF-independent joining of multicast receive addresses.
127 * \param fd Bound socket descriptor.
128 * \param iface The receiving multicast interface, or NULL for the default.
130 * \return Zero if okay, negative on error.
132 static int mcast_receiver_setup(int fd, const char *iface)
134 struct sockaddr_storage ss;
135 socklen_t sslen = sizeof(ss);
136 int id = iface == NULL ? 0 : if_nametoindex(iface);
138 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
141 if (iface != NULL && id == 0)
142 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
144 switch (ss.ss_family) {
146 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
150 m4.imr_address.s_addr = INADDR_ANY;
155 m4.imr_interface.s_addr = INADDR_ANY;
157 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
160 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
162 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
167 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
170 memset(&m6, 0, sizeof(m6));
171 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
172 m6.ipv6mr_interface = id;
173 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
178 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
179 return -E_ADDRESS_LOOKUP;
182 return -ERRNO_TO_PARA_ERROR(errno);
185 static int udp_recv_open(struct receiver_node *rn)
187 struct private_udp_recv_data *purd;
188 struct udp_recv_args_info *c = rn->conf;
189 char *iface = c->iface_given ? c->iface_arg : NULL;
192 rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
193 rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
194 purd = rn->private_data;
196 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
201 ret = mcast_receiver_setup(purd->fd, iface);
207 ret = mark_fd_nonblocking(purd->fd);
210 PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
211 c->port_arg, purd->fd);
214 free(rn->private_data);
220 * The init function of the udp receiver.
222 * \param r Pointer to the receiver struct to initialize.
224 * Initialize all function pointers of \a r.
226 void udp_recv_init(struct receiver *r)
228 struct udp_recv_args_info dummy;
230 udp_recv_cmdline_parser_init(&dummy);
231 r->shutdown = udp_shutdown;
232 r->open = udp_recv_open;
233 r->close = udp_recv_close;
234 r->pre_select = udp_recv_pre_select;
235 r->post_select = udp_recv_post_select;
236 r->parse_config = udp_recv_parse_config;
237 r->help = (struct ggo_help) {
238 .short_help = udp_recv_args_info_help,
239 .detailed_help = udp_recv_args_info_detailed_help
241 udp_recv_cmdline_parser_free(&dummy);