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 */
13 #include "portable_io.h"
18 #include "udp_recv.cmdline.h"
24 /** The size of the receiver node buffer. */
25 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
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. */
36 static void udp_recv_pre_select(struct sched *s, struct task *t)
38 struct receiver_node *rn = container_of(t, struct receiver_node, task);
39 struct private_udp_recv_data *purd = rn->private_data;
41 para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
44 static int enough_space(size_t nbytes, size_t loaded)
46 return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
49 static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
53 if (!enough_space(len, rn->loaded))
54 return -E_UDP_OVERRUN;
55 memcpy(rn->buf + rn->loaded, buf, len);
60 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
62 struct receiver_node *rn = container_of(t, struct receiver_node, task);
63 struct private_udp_recv_data *purd = rn->private_data;
65 char tmpbuf[UDP_RECV_CHUNK_SIZE];
68 if (rn->output_error && *rn->output_error < 0) {
69 t->error = *rn->output_error;
72 if (!FD_ISSET(purd->fd, &s->rfds))
74 ret = recv_bin_buffer(purd->fd, tmpbuf, UDP_RECV_CHUNK_SIZE);
76 if (is_errno(ret, EINTR) || is_errno(ret, EAGAIN))
81 t->error = -E_RECV_EOF;
85 t->error = add_rn_output(rn, tmpbuf, packet_size);
92 static void udp_shutdown(void)
97 static void udp_recv_close(struct receiver_node *rn)
99 struct private_udp_recv_data *purd = rn->private_data;
103 free(rn->private_data);
107 static void *udp_recv_parse_config(int argc, char **argv)
110 struct udp_recv_args_info *tmp =
111 para_calloc(sizeof(struct udp_recv_args_info));
113 ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
121 * Perform AF-independent joining of multicast receive addresses.
123 * \param fd Bound socket descriptor.
124 * \param iface The receiving multicast interface, or NULL for the default.
126 * \return Zero if okay, negative on error.
128 static int mcast_receiver_setup(int fd, const char *iface)
130 struct sockaddr_storage ss;
131 socklen_t sslen = sizeof(ss);
132 int id = iface == NULL ? 0 : if_nametoindex(iface);
134 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
137 if (iface != NULL && id == 0)
138 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
140 switch (ss.ss_family) {
142 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
146 m4.imr_address.s_addr = INADDR_ANY;
151 m4.imr_interface.s_addr = INADDR_ANY;
153 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
156 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
158 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
163 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
166 memset(&m6, 0, sizeof(m6));
167 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
168 m6.ipv6mr_interface = id;
169 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
174 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
175 return -E_ADDRESS_LOOKUP;
178 return -ERRNO_TO_PARA_ERROR(errno);
181 static int udp_recv_open(struct receiver_node *rn)
183 struct private_udp_recv_data *purd;
184 struct udp_recv_args_info *c = rn->conf;
185 char *iface = c->iface_given ? c->iface_arg : NULL;
188 rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
189 rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
190 purd = rn->private_data;
192 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
197 ret = mcast_receiver_setup(purd->fd, iface);
203 ret = mark_fd_nonblocking(purd->fd);
206 PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
207 c->port_arg, purd->fd);
210 free(rn->private_data);
216 * The init function of the udp receiver.
218 * \param r Pointer to the receiver struct to initialize.
220 * Initialize all function pointers of \a r.
222 void udp_recv_init(struct receiver *r)
224 struct udp_recv_args_info dummy;
226 udp_recv_cmdline_parser_init(&dummy);
227 r->shutdown = udp_shutdown;
228 r->open = udp_recv_open;
229 r->close = udp_recv_close;
230 r->pre_select = udp_recv_pre_select;
231 r->post_select = udp_recv_post_select;
232 r->parse_config = udp_recv_parse_config;
233 r->help = (struct ggo_help) {
234 .short_help = udp_recv_args_info_help,
235 .detailed_help = udp_recv_args_info_detailed_help