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);