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"
25 #include "buffer_tree.h"
27 /** The size of the receiver node buffer. */
28 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
30 * Data specific to the udp receiver.
32 * \sa \ref receiver, \ref receiver_node.
34 struct private_udp_recv_data {
35 /** The socket file descriptor. */
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;
46 ret = generic_recv_pre_select(s, t);
50 para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
53 static int enough_space(size_t nbytes, size_t loaded)
55 return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
58 static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
62 if (!enough_space(len, rn->loaded))
63 return -E_UDP_OVERRUN;
64 memcpy(rn->buf + rn->loaded, buf, len);
69 static void udp_recv_post_select_nobtr(__a_unused struct sched *s, struct task *t)
71 struct receiver_node *rn = container_of(t, struct receiver_node, task);
72 struct private_udp_recv_data *purd = rn->private_data;
74 char tmpbuf[UDP_RECV_CHUNK_SIZE];
77 if (rn->output_error && *rn->output_error < 0) {
78 t->error = *rn->output_error;
81 if (!FD_ISSET(purd->fd, &s->rfds))
83 ret = recv_bin_buffer(purd->fd, tmpbuf, UDP_RECV_CHUNK_SIZE);
85 if (is_errno(ret, EINTR) || is_errno(ret, EAGAIN))
90 t->error = -E_RECV_EOF;
94 if (packet_size >= FEC_EOF_PACKET_LEN)
95 if (!memcmp(tmpbuf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
97 t->error = add_rn_output(rn, tmpbuf, packet_size);
104 #define UDP_RECV_READ_BUF_SIZE 1500
106 static void udp_recv_post_select_btr(__a_unused struct sched *s, struct task *t)
108 struct receiver_node *rn = container_of(t, struct receiver_node, task);
109 struct private_udp_recv_data *purd = rn->private_data;
110 struct btr_node *btrn = rn->btrn;
116 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
121 if (!FD_ISSET(purd->fd, &s->rfds))
123 buf = para_malloc(UDP_RECV_READ_BUF_SIZE);
124 ret = recv_bin_buffer(purd->fd, buf, UDP_RECV_READ_BUF_SIZE);
130 if (packet_size >= FEC_EOF_PACKET_LEN) {
131 if (!memcmp(buf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN)) {
136 btr_add_output(buf, ret, btrn);
140 btr_remove_node(btrn);
144 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
146 struct receiver_node *rn = container_of(t, struct receiver_node, task);
148 return udp_recv_post_select_btr(s, t);
149 udp_recv_post_select_nobtr(s, t);
152 static void udp_shutdown(void)
157 static void udp_recv_close(struct receiver_node *rn)
159 struct private_udp_recv_data *purd = rn->private_data;
163 free(rn->private_data);
165 udp_recv_cmdline_parser_free(rn->conf);
168 static void *udp_recv_parse_config(int argc, char **argv)
171 struct udp_recv_args_info *tmp =
172 para_calloc(sizeof(struct udp_recv_args_info));
174 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
182 * Perform AF-independent joining of multicast receive addresses.
184 * \param fd Bound socket descriptor.
185 * \param iface The receiving multicast interface, or NULL for the default.
187 * \return Zero if okay, negative on error.
189 static int mcast_receiver_setup(int fd, const char *iface)
191 struct sockaddr_storage ss;
192 socklen_t sslen = sizeof(ss);
193 int id = iface == NULL ? 0 : if_nametoindex(iface);
195 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
198 if (iface != NULL && id == 0)
199 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
201 switch (ss.ss_family) {
203 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
207 m4.imr_address.s_addr = INADDR_ANY;
212 m4.imr_interface.s_addr = INADDR_ANY;
214 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
217 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
219 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
224 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
227 memset(&m6, 0, sizeof(m6));
228 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
229 m6.ipv6mr_interface = id;
230 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
235 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
236 return -E_ADDRESS_LOOKUP;
239 return -ERRNO_TO_PARA_ERROR(errno);
242 static int udp_recv_open(struct receiver_node *rn)
244 struct private_udp_recv_data *purd;
245 struct udp_recv_args_info *c = rn->conf;
246 char *iface = c->iface_given ? c->iface_arg : NULL;
249 rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
250 rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
251 purd = rn->private_data;
253 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
258 ret = mcast_receiver_setup(purd->fd, iface);
264 ret = mark_fd_nonblocking(purd->fd);
267 PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
268 c->port_arg, purd->fd);
271 free(rn->private_data);
277 * The init function of the udp receiver.
279 * \param r Pointer to the receiver struct to initialize.
281 * Initialize all function pointers of \a r.
283 void udp_recv_init(struct receiver *r)
285 struct udp_recv_args_info dummy;
287 udp_recv_cmdline_parser_init(&dummy);
288 r->shutdown = udp_shutdown;
289 r->open = udp_recv_open;
290 r->close = udp_recv_close;
291 r->pre_select = udp_recv_pre_select;
292 r->post_select = udp_recv_post_select;
293 r->parse_config = udp_recv_parse_config;
294 r->help = (struct ggo_help) {
295 .short_help = udp_recv_args_info_help,
296 .detailed_help = udp_recv_args_info_detailed_help
298 udp_recv_cmdline_parser_free(&dummy);