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;
72 int ret, readv_ret, iovcnt;
75 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
78 iovcnt = btr_pool_get_buffers(purd->btrp, iov);
82 ret = readv_nonblock(purd->fd, iov, iovcnt, &s->rfds, &num_bytes);
86 ret = udp_check_eof(num_bytes, iov);
89 if (iov[0].iov_len >= num_bytes)
90 btr_add_output_pool(purd->btrp, num_bytes, btrn);
91 else { /* both buffers contain data */
92 btr_add_output_pool(purd->btrp, iov[0].iov_len, btrn);
93 btr_add_output_pool(purd->btrp, num_bytes - iov[0].iov_len,
100 btr_remove_node(btrn);
106 static void udp_recv_close(struct receiver_node *rn)
108 struct private_udp_recv_data *purd = rn->private_data;
112 btr_pool_free(purd->btrp);
113 free(rn->private_data);
116 static void *udp_recv_parse_config(int argc, char **argv)
119 struct udp_recv_args_info *tmp =
120 para_calloc(sizeof(struct udp_recv_args_info));
122 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
130 * Perform AF-independent joining of multicast receive addresses.
132 * \param fd Bound socket descriptor.
133 * \param iface The receiving multicast interface, or NULL for the default.
135 * \return Zero if okay, negative on error.
137 static int mcast_receiver_setup(int fd, const char *iface)
139 struct sockaddr_storage ss;
140 socklen_t sslen = sizeof(ss);
141 int id = iface == NULL ? 0 : if_nametoindex(iface);
143 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
146 if (iface != NULL && id == 0)
147 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
149 switch (ss.ss_family) {
151 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
155 m4.imr_address.s_addr = INADDR_ANY;
160 m4.imr_interface.s_addr = INADDR_ANY;
162 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
165 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
167 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
172 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
175 memset(&m6, 0, sizeof(m6));
176 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
177 m6.ipv6mr_interface = id;
178 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
183 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
184 return -E_ADDRESS_LOOKUP;
187 return -ERRNO_TO_PARA_ERROR(errno);
190 static int udp_recv_open(struct receiver_node *rn)
192 struct private_udp_recv_data *purd;
193 struct udp_recv_args_info *c = rn->conf;
194 char *iface = c->iface_given ? c->iface_arg : NULL;
197 rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
198 purd = rn->private_data;
200 ret = makesock(IPPROTO_UDP, 1, c->host_arg, c->port_arg, NULL);
205 ret = mcast_receiver_setup(purd->fd, iface);
211 ret = mark_fd_nonblocking(purd->fd);
216 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
217 c->port_arg, purd->fd);
218 purd->btrp = btr_pool_new("udp_recv", 320 * 1024);
221 free(rn->private_data);
225 static void udp_recv_free_config(void *conf)
227 udp_recv_cmdline_parser_free(conf);
232 * The init function of the udp receiver.
234 * \param r Pointer to the receiver struct to initialize.
236 * Initialize all function pointers of \a r.
238 void udp_recv_init(struct receiver *r)
240 struct udp_recv_args_info dummy;
242 udp_recv_cmdline_parser_init(&dummy);
243 r->open = udp_recv_open;
244 r->close = udp_recv_close;
245 r->pre_select = udp_recv_pre_select;
246 r->post_select = udp_recv_post_select;
247 r->parse_config = udp_recv_parse_config;
248 r->free_config = udp_recv_free_config;
249 r->help = (struct ggo_help) {
250 .short_help = udp_recv_args_info_help,
251 .detailed_help = udp_recv_args_info_detailed_help
253 udp_recv_cmdline_parser_free(&dummy);