*/
/** \file udp_recv.c Paraslash's udp receiver */
+#include <regex.h>
#include <dirent.h>
+#include <sys/socket.h>
+#include <net/if.h>
#include "para.h"
#include "error.h"
#include "portable_io.h"
-#include "udp_header.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
/** The size of the receiver node buffer. */
#define UDP_RECV_CHUNK_SIZE (128 * 1024)
-
/**
* Data specific to the udp receiver.
*
* \sa \ref receiver, \ref receiver_node.
*/
struct private_udp_recv_data {
- /**
- * Whether a header was received.
- *
- * A flag indicating whether this receiver already received a packet
- * which contains the audio file header.
- *
- * This flag has no effect if the audio stream indicates that no extra
- * headers will be sent (mp3, aac). Otherwise, all data packets are
- * dropped until the header is received.
- */
- int have_header;
/** The socket file descriptor. */
int fd;
- /** Non-zero on short reads. */
- uint16_t need_more;
- /** Copied from the first audio header received. */
- uint16_t stream_type;
};
static void udp_recv_pre_select(struct sched *s, struct task *t)
return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
}
-/*
- * Perform some sanity checks on an udp audio file header.
- *
- * return: negative on error, 0: discard data, 1: use data
- */
-static int examine_audio_header(struct private_udp_recv_data *purd,
- struct udp_audio_header *uah, size_t packet_size)
-{
- /* payload_len includes header */
- if (uah->payload_len < uah->header_len)
- return -E_UDP_BAD_HEADER;
- switch (uah->packet_type) {
- case UDP_EOF_PACKET:
- return -E_RECV_EOF;
- case UDP_BOF_PACKET:
- purd->have_header = 1;
- /* fall through */
- case UDP_DATA_PACKET:
- if (uah->header_len) /* header in no-header packet */
- return -E_UDP_BAD_HEADER;
- break;
- case UDP_HEADER_PACKET:
- if (!uah->header_len) /** no header in header packet */
- return -E_UDP_BAD_HEADER;
- break;
- default: /* bad packet type */
- return -E_UDP_BAD_HEADER;
- }
- /* check stream type */
- if (uah->stream_type != UDP_PLAIN_STREAM &&
- uah->stream_type != UDP_HEADER_STREAM)
- return -E_UDP_BAD_STREAM_TYPE;
- if (purd->stream_type == UDP_UNKNOWN_STREAM)
- purd->stream_type = uah->stream_type;
- /* stream type must not change */
- if (uah->stream_type != purd->stream_type)
- return -E_UDP_BAD_STREAM_TYPE;
- if (!purd->have_header && uah->stream_type == UDP_HEADER_STREAM)
- /* can't use the data, wait for header packet */
- return 0;
- if (packet_size < uah->payload_len + UDP_AUDIO_HEADER_LEN)
- /* we read only a part of the package */
- purd->need_more = uah->payload_len
- + UDP_AUDIO_HEADER_LEN - packet_size;
- return 1;
-}
-
static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
{
if (!len)
struct private_udp_recv_data *purd = rn->private_data;
int ret;
char tmpbuf[UDP_RECV_CHUNK_SIZE];
- uint16_t data_len;
- char *data_buf;
size_t packet_size;
- struct udp_audio_header uah;
if (rn->output_error && *rn->output_error < 0) {
t->error = *rn->output_error;
if (!ret)
return;
packet_size = ret;
- for (;;) {
- uint16_t num;
-
- if (!purd->need_more) {
- ret = read_udp_audio_header(tmpbuf, packet_size, &uah);
- if (ret >= 0)
- break;
- goto success; /* drop data */
- }
- num = PARA_MIN(purd->need_more, (uint16_t)packet_size);
- assert(num > 0);
- t->error = add_rn_output(rn, tmpbuf, num);
- if (t->error < 0)
+ if (packet_size >= FEC_EOF_PACKET_LEN)
+ if (!memcmp(tmpbuf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
return;
- purd->need_more -= num;
- if (packet_size <= num)
- goto success;
- packet_size -= num;
- memmove(tmpbuf, tmpbuf + num, packet_size);
- }
- assert(!purd->need_more);
- t->error = examine_audio_header(purd, &uah, packet_size);
- if (t->error <= 0)
+ t->error = add_rn_output(rn, tmpbuf, packet_size);
+ if (t->error < 0)
return;
- data_len = uah.payload_len;
- data_buf = tmpbuf + UDP_AUDIO_HEADER_LEN;
- if (uah.packet_type == UDP_HEADER_PACKET) {
- if (purd->have_header) { /* skip header */
- data_buf += uah.header_len;
- data_len -= uah.header_len;
- } else { /* only use the header */
- purd->have_header = 1;
- data_len = uah.header_len;
- }
- }
- t->error = add_rn_output(rn, data_buf, data_len);
- return;
success:
t->error = 1;
}
return NULL;
}
+/*
+ * Perform AF-independent joining of multicast receive addresses.
+ *
+ * \param fd Bound socket descriptor.
+ * \param iface The receiving multicast interface, or NULL for the default.
+ *
+ * \return Zero if okay, negative on error.
+ */
+static int mcast_receiver_setup(int fd, const char *iface)
+{
+ struct sockaddr_storage ss;
+ socklen_t sslen = sizeof(ss);
+ int id = iface == NULL ? 0 : if_nametoindex(iface);
+
+ if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
+ goto err;
+
+ if (iface != NULL && id == 0)
+ PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
+
+ switch (ss.ss_family) {
+ case AF_INET:
+ if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
+#ifdef HAVE_IP_MREQN
+ struct ip_mreqn m4;
+
+ m4.imr_address.s_addr = INADDR_ANY;
+ m4.imr_ifindex = id;
+#else
+ struct ip_mreq m4;
+
+ m4.imr_interface.s_addr = INADDR_ANY;
+ if (id != 0)
+ PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
+
+#endif
+ m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
+
+ if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
+ break;
+ }
+ return 0;
+ case AF_INET6:
+ if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
+ struct ipv6_mreq m6;
+
+ memset(&m6, 0, sizeof(m6));
+ memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
+ m6.ipv6mr_interface = id;
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
+ break;
+ }
+ return 0;
+ default:
+ PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
+ return -E_ADDRESS_LOOKUP;
+ }
+err:
+ return -ERRNO_TO_PARA_ERROR(errno);
+}
+
static int udp_recv_open(struct receiver_node *rn)
{
struct private_udp_recv_data *purd;
struct udp_recv_args_info *c = rn->conf;
+ char *iface = c->iface_given ? c->iface_arg : NULL;
int ret;
rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
purd = rn->private_data;
- ret = create_udp_recv_socket(c->host_arg, c->port_arg);
+
+ ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
if (ret < 0)
goto err;
purd->fd = ret;
+
+ ret = mcast_receiver_setup(purd->fd, iface);
+ if (ret < 0) {
+ close(purd->fd);
+ return ret;
+ }
+
ret = mark_fd_nonblocking(purd->fd);
if (ret < 0)
goto err;
- purd->stream_type = UDP_UNKNOWN_STREAM;
PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
c->port_arg, purd->fd);
return purd->fd;
.short_help = udp_recv_args_info_help,
.detailed_help = udp_recv_args_info_detailed_help
};
+ udp_recv_cmdline_parser_free(&dummy);
}
projects / paraslash.git / blobdiff