1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2 /** \file udp_recv.c Paraslash's udp receiver */
4 #include <netinet/in.h>
6 #include <sys/socket.h>
14 #include "recv_cmd.lsg.h"
17 #include "portable_io.h"
20 #include "buffer_tree.h"
26 static void udp_recv_pre_select(struct sched *s, void *context)
28 struct receiver_node *rn = context;
30 if (generic_recv_pre_select(s, rn) <= 0)
32 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
35 static int udp_check_eof(size_t sz, struct iovec iov[2])
37 if (sz < FEC_EOF_PACKET_LEN)
39 if (iov[0].iov_len >= FEC_EOF_PACKET_LEN) {
40 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET,
41 FEC_EOF_PACKET_LEN) != 0)
45 if (memcmp(iov[0].iov_base, FEC_EOF_PACKET, iov[0].iov_len) != 0)
47 if (memcmp(iov[1].iov_base, &FEC_EOF_PACKET[iov[0].iov_len],
48 FEC_EOF_PACKET_LEN - iov[0].iov_len) != 0)
53 static int udp_recv_post_select(__a_unused struct sched *s, void *context)
55 struct receiver_node *rn = context;
56 struct btr_node *btrn = rn->btrn;
59 int ret, readv_ret, iovcnt;
61 ret = task_get_notification(rn->task);
64 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
67 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
71 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
75 ret = udp_check_eof(num_bytes, iov);
78 if (iov[0].iov_len >= num_bytes)
79 btr_add_output_pool(rn->btrp, num_bytes, btrn);
80 else { /* both buffers contain data */
81 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
82 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len,
88 btr_remove_node(&rn->btrn);
95 static void udp_recv_close(struct receiver_node *rn)
99 btr_pool_free(rn->btrp);
103 * Perform AF-independent joining of multicast receive addresses.
105 * \param fd Bound socket descriptor.
106 * \param iface The receiving multicast interface, or NULL for the default.
108 * \return Zero if okay, negative on error.
110 static int mcast_receiver_setup(int fd, const char *iface)
112 struct sockaddr_storage ss;
113 socklen_t sslen = sizeof(ss);
114 int id = iface == NULL ? 0 : if_nametoindex(iface);
116 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
118 assert(ss.ss_family == AF_INET || ss.ss_family == AF_INET6);
120 if (iface != NULL && id == 0)
121 PARA_WARNING_LOG("could not resolve interface %s, using default\n",
124 switch (ss.ss_family) {
126 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
130 m4.imr_address.s_addr = INADDR_ANY;
135 m4.imr_interface.s_addr = INADDR_ANY;
137 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported\n");
140 m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
142 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
143 &m4, sizeof(m4)) < 0)
148 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
151 memset(&m6, 0, sizeof(m6));
152 memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
153 m6.ipv6mr_interface = id;
154 if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
160 return -ERRNO_TO_PARA_ERROR(errno);
163 static int udp_recv_open(struct receiver_node *rn)
165 struct lls_parse_result *lpr = rn->lpr;
166 const char *iface = RECV_CMD_OPT_STRING_VAL(UDP, IFACE, lpr);
167 const char *host = RECV_CMD_OPT_STRING_VAL(UDP, HOST, lpr);
168 uint32_t port = RECV_CMD_OPT_UINT32_VAL(UDP, PORT, lpr);
171 ret = makesock(IPPROTO_UDP, 1, host, port, NULL);
175 ret = mcast_receiver_setup(rn->fd, iface);
178 ret = mark_fd_nonblocking(rn->fd);
181 PARA_INFO_LOG("receiving from %s:%u, fd=%d\n", host, port, rn->fd);
182 rn->btrp = btr_pool_new("udp_recv", 320 * 1024);
189 const struct receiver lsg_recv_cmd_com_udp_user_data = {
190 .open = udp_recv_open,
191 .close = udp_recv_close,
192 .pre_select = udp_recv_pre_select,
193 .post_select = udp_recv_post_select,