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"
26 /** The size of the receiver node buffer. */
27 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
29 * Data specific to the udp receiver.
31 * \sa \ref receiver, \ref receiver_node.
33 struct private_udp_recv_data {
34 /** The socket file descriptor. */
36 struct btr_pool *btrp;
39 static void udp_recv_pre_select(struct sched *s, struct task *t)
41 struct receiver_node *rn = container_of(t, struct receiver_node, task);
42 struct private_udp_recv_data *purd = rn->private_data;
44 if (generic_recv_pre_select(s, t) <= 0)
46 para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
49 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
51 struct receiver_node *rn = container_of(t, struct receiver_node, task);
52 struct private_udp_recv_data *purd = rn->private_data;
53 struct btr_node *btrn = rn->btrn;
56 size_t packet_size, bufsize;
59 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
64 if (!FD_ISSET(purd->fd, &s->rfds))
66 bufsize = btr_pool_get_buffer(purd->btrp, &buf);
70 ret = recv_bin_buffer(purd->fd, buf, bufsize);
76 if (packet_size >= FEC_EOF_PACKET_LEN) {
77 if (!memcmp(buf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN)) {
78 PARA_INFO_LOG("received eof packet\n");
83 btr_add_output_pool(purd->btrp, packet_size, btrn);
86 btr_remove_node(btrn);
92 static void udp_recv_close(struct receiver_node *rn)
94 struct private_udp_recv_data *purd = rn->private_data;
98 btr_pool_free(purd->btrp);
99 free(rn->private_data);
103 static void *udp_recv_parse_config(int argc, char **argv)
106 struct udp_recv_args_info *tmp =
107 para_calloc(sizeof(struct udp_recv_args_info));
109 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
117 * Perform AF-independent joining of multicast receive addresses.
119 * \param fd Bound socket descriptor.
120 * \param iface The receiving multicast interface, or NULL for the default.
122 * \return Zero if okay, negative on error.
124 static int mcast_receiver_setup(int fd, const char *iface)
126 struct sockaddr_storage ss;
127 socklen_t sslen = sizeof(ss);
128 int id = iface == NULL ? 0 : if_nametoindex(iface);
130 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
133 if (iface != NULL && id == 0)
134 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
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.");
152 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
154 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
159 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
162 memset(&m6, 0, sizeof(m6));
163 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
164 m6.ipv6mr_interface = id;
165 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
170 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
171 return -E_ADDRESS_LOOKUP;
174 return -ERRNO_TO_PARA_ERROR(errno);
177 static int udp_recv_open(struct receiver_node *rn)
179 struct private_udp_recv_data *purd;
180 struct udp_recv_args_info *c = rn->conf;
181 char *iface = c->iface_given ? c->iface_arg : NULL;
184 rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
185 rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
186 purd = rn->private_data;
188 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
193 ret = mcast_receiver_setup(purd->fd, iface);
199 ret = mark_fd_nonblocking(purd->fd);
204 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
205 c->port_arg, purd->fd);
206 purd->btrp = btr_pool_new("udp_recv", 320 * 1024);
209 free(rn->private_data);
214 static void udp_recv_free_config(void *conf)
216 udp_recv_cmdline_parser_free(conf);
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->open = udp_recv_open;
232 r->close = udp_recv_close;
233 r->pre_select = udp_recv_pre_select;
234 r->post_select = udp_recv_post_select;
235 r->parse_config = udp_recv_parse_config;
236 r->free_config = udp_recv_free_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);