2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
6 /** \file udp_recv.c Paraslash's udp receiver */
8 #include <netinet/in.h>
10 #include <sys/socket.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
18 #include "recv_cmd.lsg.h"
21 #include "portable_io.h"
24 #include "buffer_tree.h"
30 static void udp_recv_pre_select(struct sched *s, void *context)
32 struct receiver_node *rn = context;
34 if (generic_recv_pre_select(s, rn) <= 0)
36 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
39 static int udp_check_eof(size_t sz, struct iovec iov[2])
41 if (sz < FEC_EOF_PACKET_LEN)
43 if (iov[0].iov_len >= FEC_EOF_PACKET_LEN) {
44 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET,
45 FEC_EOF_PACKET_LEN) != 0)
49 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET, iov[0].iov_len) != 0)
51 if (memcmp(iov[1].iov_base, &FEC_EOF_PACKET[iov[0].iov_len],
52 FEC_EOF_PACKET_LEN - iov[0].iov_len) != 0)
57 static int udp_recv_post_select(__a_unused struct sched *s, void *context)
59 struct receiver_node *rn = context;
60 struct btr_node *btrn = rn->btrn;
63 int ret, readv_ret, iovcnt;
65 ret = task_get_notification(rn->task);
68 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
71 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
75 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
79 ret = udp_check_eof(num_bytes, iov);
82 if (iov[0].iov_len >= num_bytes)
83 btr_add_output_pool(rn->btrp, num_bytes, btrn);
84 else { /* both buffers contain data */
85 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
86 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len,
92 btr_remove_node(&rn->btrn);
99 static void udp_recv_close(struct receiver_node *rn)
103 btr_pool_free(rn->btrp);
107 * Perform AF-independent joining of multicast receive addresses.
109 * \param fd Bound socket descriptor.
110 * \param iface The receiving multicast interface, or NULL for the default.
112 * \return Zero if okay, negative on error.
114 static int mcast_receiver_setup(int fd, const char *iface)
116 struct sockaddr_storage ss;
117 socklen_t sslen = sizeof(ss);
118 int id = iface == NULL ? 0 : if_nametoindex(iface);
120 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
122 assert(ss.ss_family == AF_INET || ss.ss_family == AF_INET6);
124 if (iface != NULL && id == 0)
125 PARA_WARNING_LOG("could not resolve interface %s, using default\n",
128 switch (ss.ss_family) {
130 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
134 m4.imr_address.s_addr = INADDR_ANY;
139 m4.imr_interface.s_addr = INADDR_ANY;
141 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported\n");
144 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
146 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
147 &m4, sizeof(m4)) < 0)
152 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
155 memset(&m6, 0, sizeof(m6));
156 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
157 m6.ipv6mr_interface = id;
158 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
164 return -ERRNO_TO_PARA_ERROR(errno);
167 static int udp_recv_open(struct receiver_node *rn)
169 struct lls_parse_result *lpr = rn->lpr;
170 const char *iface = RECV_CMD_OPT_STRING_VAL(UDP, IFACE, lpr);
171 const char *host = RECV_CMD_OPT_STRING_VAL(UDP, HOST, lpr);
172 uint32_t port = RECV_CMD_OPT_UINT32_VAL(UDP, PORT, lpr);
175 ret = makesock(IPPROTO_UDP, 1, host, port, NULL);
179 ret = mcast_receiver_setup(rn->fd, iface);
182 ret = mark_fd_nonblocking(rn->fd);
185 PARA_INFO_LOG("receiving from %s:%u, fd=%d\n", host, port, rn->fd);
186 rn->btrp = btr_pool_new("udp_recv", 320 * 1024);
193 const struct receiver lsg_recv_cmd_com_udp_user_data = {
194 .open = udp_recv_open,
195 .close = udp_recv_close,
196 .pre_select = udp_recv_pre_select,
197 .post_select = udp_recv_post_select,