2 * Copyright (C) 2005-2010 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);