2 * Copyright (C) 2005-2013 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 */
9 #include <sys/socket.h>
14 #include "portable_io.h"
18 #include "buffer_tree.h"
20 #include "udp_recv.cmdline.h"
25 static void udp_recv_pre_select(struct sched *s, struct task *t)
27 struct receiver_node *rn = container_of(t, struct receiver_node, task);
29 if (generic_recv_pre_select(s, t) <= 0)
31 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
34 static int udp_check_eof(size_t sz, struct iovec iov[2])
36 if (sz < FEC_EOF_PACKET_LEN)
38 if (iov[0].iov_len >= FEC_EOF_PACKET_LEN) {
39 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET,
40 FEC_EOF_PACKET_LEN) != 0)
44 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET, iov[0].iov_len) != 0)
46 if (memcmp(iov[1].iov_base, FEC_EOF_PACKET + iov[0].iov_len,
47 FEC_EOF_PACKET_LEN - iov[0].iov_len) != 0)
52 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
54 struct receiver_node *rn = container_of(t, struct receiver_node, task);
55 struct btr_node *btrn = rn->btrn;
58 int ret, readv_ret, iovcnt;
60 ret = task_get_notification(t);
63 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
66 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
70 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
74 ret = udp_check_eof(num_bytes, iov);
77 if (iov[0].iov_len >= num_bytes)
78 btr_add_output_pool(rn->btrp, num_bytes, btrn);
79 else { /* both buffers contain data */
80 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
81 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len,
88 btr_remove_node(&rn->btrn);
94 static void udp_recv_close(struct receiver_node *rn)
98 btr_pool_free(rn->btrp);
101 static void *udp_recv_parse_config(int argc, char **argv)
104 struct udp_recv_args_info *tmp =
105 para_calloc(sizeof(struct udp_recv_args_info));
107 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
115 * Perform AF-independent joining of multicast receive addresses.
117 * \param fd Bound socket descriptor.
118 * \param iface The receiving multicast interface, or NULL for the default.
120 * \return Zero if okay, negative on error.
122 static int mcast_receiver_setup(int fd, const char *iface)
124 struct sockaddr_storage ss;
125 socklen_t sslen = sizeof(ss);
126 int id = iface == NULL ? 0 : if_nametoindex(iface);
128 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
130 assert(ss.ss_family == AF_INET || ss.ss_family == AF_INET6);
132 if (iface != NULL && id == 0)
133 PARA_WARNING_LOG("could not resolve interface %s, using default\n",
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\n");
152 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
154 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
155 &m4, sizeof(m4)) < 0)
160 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
163 memset(&m6, 0, sizeof(m6));
164 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
165 m6.ipv6mr_interface = id;
166 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
172 return -ERRNO_TO_PARA_ERROR(errno);
175 static int udp_recv_open(struct receiver_node *rn)
177 struct udp_recv_args_info *c = rn->conf;
178 char *iface = c->iface_given ? c->iface_arg : NULL;
181 ret = makesock(IPPROTO_UDP, 1, c->host_arg, c->port_arg, NULL);
186 ret = mcast_receiver_setup(rn->fd, iface);
192 ret = mark_fd_nonblocking(rn->fd);
197 PARA_INFO_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
198 c->port_arg, rn->fd);
199 rn->btrp = btr_pool_new("udp_recv", 320 * 1024);
205 static void udp_recv_free_config(void *conf)
207 udp_recv_cmdline_parser_free(conf);
212 * The init function of the udp receiver.
214 * \param r Pointer to the receiver struct to initialize.
216 * Initialize all function pointers of \a r.
218 void udp_recv_init(struct receiver *r)
220 struct udp_recv_args_info dummy;
222 udp_recv_cmdline_parser_init(&dummy);
223 r->open = udp_recv_open;
224 r->close = udp_recv_close;
225 r->pre_select = udp_recv_pre_select;
226 r->post_select = udp_recv_post_select;
227 r->parse_config = udp_recv_parse_config;
228 r->free_config = udp_recv_free_config;
229 r->help = (struct ggo_help) {
230 .short_help = udp_recv_args_info_help,
231 .detailed_help = udp_recv_args_info_detailed_help
233 udp_recv_cmdline_parser_free(&dummy);