udp_recv.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 /** \file udp_recv.c Paraslash's udp receiver */
   7
   8 #include <regex.h>
   9 #include <dirent.h>
  10 #include <sys/socket.h>
  11 #include <net/if.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "portable_io.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "recv.h"
  20 #include "udp_recv.cmdline.h"
  21 #include "audiod.h"
  22 #include "string.h"
  23 #include "net.h"
  24 #include "fd.h"
  25 #include "buffer_tree.h"
  26
  27 /** The size of the receiver node buffer. */
  28 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
  29 /**
  30  * Data specific to the udp receiver.
  31  *
  32  * \sa \ref receiver, \ref receiver_node.
  33  */
  34 struct private_udp_recv_data {
  35         /** The socket file descriptor. */
  36         int fd;
  37 };
  38
  39 static void udp_recv_pre_select(struct sched *s, struct task *t)
  40 {
  41         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  42         struct private_udp_recv_data *purd = rn->private_data;
  43         int ret;
  44
  45         if (rn->btrn) {
  46                 ret = generic_recv_pre_select(s, t);
  47                 if (ret <= 0)
  48                         return;
  49         }
  50         para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
  51 }
  52
  53 static int enough_space(size_t nbytes, size_t loaded)
  54 {
  55         return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
  56 }
  57
  58 static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
  59 {
  60         if (!len)
  61                 return 1;
  62         if (!enough_space(len, rn->loaded))
  63                 return -E_UDP_OVERRUN;
  64         memcpy(rn->buf + rn->loaded, buf, len);
  65         rn->loaded += len;
  66         return 1;
  67 }
  68
  69 static void udp_recv_post_select_nobtr(__a_unused struct sched *s, struct task *t)
  70 {
  71         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  72         struct private_udp_recv_data *purd = rn->private_data;
  73         int ret;
  74         char tmpbuf[UDP_RECV_CHUNK_SIZE];
  75         size_t packet_size;
  76
  77         if (rn->output_error && *rn->output_error < 0) {
  78                 t->error = *rn->output_error;
  79                 return;
  80         }
  81         if (!FD_ISSET(purd->fd, &s->rfds))
  82                 return;
  83         ret = recv_bin_buffer(purd->fd, tmpbuf, UDP_RECV_CHUNK_SIZE);
  84         if (ret < 0) {
  85                 if (is_errno(ret, EINTR) || is_errno(ret, EAGAIN))
  86                         goto success;
  87                 t->error = ret;
  88                 return;
  89         }
  90         t->error = -E_RECV_EOF;
  91         if (!ret)
  92                 return;
  93         packet_size = ret;
  94         if (packet_size >= FEC_EOF_PACKET_LEN)
  95                 if (!memcmp(tmpbuf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
  96                         return;
  97         t->error = add_rn_output(rn, tmpbuf, packet_size);
  98         if (t->error < 0)
  99                 return;
 100 success:
 101         t->error = 1;
 102 }
 103
 104 #define UDP_RECV_READ_BUF_SIZE 1500
 105
 106 static void udp_recv_post_select_btr(__a_unused struct sched *s, struct task *t)
 107 {
 108         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 109         struct private_udp_recv_data *purd = rn->private_data;
 110         struct btr_node *btrn = rn->btrn;
 111         int ret;
 112         char *buf = NULL;
 113         size_t packet_size;
 114
 115         t->error = 0;
 116         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 117         if (ret < 0)
 118                 goto err;
 119         if (ret == 0)
 120                 return;
 121         if (!FD_ISSET(purd->fd, &s->rfds))
 122                 return;
 123         buf = para_malloc(UDP_RECV_READ_BUF_SIZE);
 124         ret = recv_bin_buffer(purd->fd, buf, UDP_RECV_READ_BUF_SIZE);
 125         if (ret == 0)
 126                 ret = -E_RECV_EOF;
 127         if (ret < 0)
 128                 goto err;
 129         packet_size = ret;
 130         if (packet_size >= FEC_EOF_PACKET_LEN) {
 131                 if (!memcmp(buf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN)) {
 132                         ret = -E_RECV_EOF;
 133                         goto err;
 134                 }
 135         }
 136         btr_add_output(buf, ret, btrn);
 137         return;
 138 err:
 139         free(buf);
 140         btr_remove_node(btrn);
 141         t->error = ret;
 142 }
 143
 144 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
 145 {
 146         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 147         if (rn->btrn)
 148                 return udp_recv_post_select_btr(s, t);
 149         udp_recv_post_select_nobtr(s, t);
 150 }
 151
 152 static void udp_shutdown(void)
 153 {
 154         return;
 155 }
 156
 157 static void udp_recv_close(struct receiver_node *rn)
 158 {
 159         struct private_udp_recv_data *purd = rn->private_data;
 160
 161         if (purd->fd >= 0)
 162                 close(purd->fd);
 163         free(rn->private_data);
 164         free(rn->buf);
 165         udp_recv_cmdline_parser_free(rn->conf);
 166 }
 167
 168 static void *udp_recv_parse_config(int argc, char **argv)
 169 {
 170         int ret;
 171         struct udp_recv_args_info *tmp =
 172                 para_calloc(sizeof(struct udp_recv_args_info));
 173
 174         ret = udp_recv_cmdline_parser(argc, argv, tmp)? -E_UDP_SYNTAX : 1;
 175         if (ret >= 0)
 176                 return tmp;
 177         free(tmp);
 178         return NULL;
 179 }
 180
 181 /*
 182  * Perform AF-independent joining of multicast receive addresses.
 183  *
 184  * \param fd    Bound socket descriptor.
 185  * \param iface The receiving multicast interface, or NULL for the default.
 186  *
 187  * \return Zero if okay, negative on error.
 188  */
 189 static int mcast_receiver_setup(int fd, const char *iface)
 190 {
 191         struct sockaddr_storage ss;
 192         socklen_t sslen = sizeof(ss);
 193         int id = iface == NULL ? 0 : if_nametoindex(iface);
 194
 195         if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
 196                 goto err;
 197
 198         if (iface != NULL && id == 0)
 199                 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
 200
 201         switch (ss.ss_family) {
 202         case AF_INET:
 203                 if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
 204 #ifdef HAVE_IP_MREQN
 205                         struct ip_mreqn m4;
 206
 207                         m4.imr_address.s_addr   = INADDR_ANY;
 208                         m4.imr_ifindex          = id;
 209 #else
 210                         struct ip_mreq m4;
 211
 212                         m4.imr_interface.s_addr = INADDR_ANY;
 213                         if (id != 0)
 214                                 PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
 215
 216 #endif
 217                         m4.imr_multiaddr        = ((struct sockaddr_in *)&ss)->sin_addr;
 218
 219                         if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
 220                                 break;
 221                 }
 222                 return 0;
 223         case AF_INET6:
 224                 if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
 225                         struct ipv6_mreq m6;
 226
 227                         memset(&m6, 0, sizeof(m6));
 228                         memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
 229                         m6.ipv6mr_interface = id;
 230                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
 231                                 break;
 232                 }
 233                 return 0;
 234         default:
 235                 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
 236                 return -E_ADDRESS_LOOKUP;
 237         }
 238 err:
 239         return -ERRNO_TO_PARA_ERROR(errno);
 240 }
 241
 242 static int udp_recv_open(struct receiver_node *rn)
 243 {
 244         struct private_udp_recv_data *purd;
 245         struct udp_recv_args_info *c = rn->conf;
 246         char  *iface = c->iface_given ? c->iface_arg : NULL;
 247         int ret;
 248
 249         rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
 250         rn->private_data = para_calloc(sizeof(struct private_udp_recv_data));
 251         purd = rn->private_data;
 252
 253         ret = makesock(AF_UNSPEC, IPPROTO_UDP, 1, c->host_arg, c->port_arg);
 254         if (ret < 0)
 255                 goto err;
 256         purd->fd = ret;
 257
 258         ret = mcast_receiver_setup(purd->fd, iface);
 259         if (ret < 0) {
 260                 close(purd->fd);
 261                 return ret;
 262         }
 263
 264         ret = mark_fd_nonblocking(purd->fd);
 265         if (ret < 0)
 266                 goto err;
 267         PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
 268                 c->port_arg, purd->fd);
 269         return purd->fd;
 270 err:
 271         free(rn->private_data);
 272         free(rn->buf);
 273         return ret;
 274 }
 275
 276 /**
 277  * The init function of the udp receiver.
 278  *
 279  * \param r Pointer to the receiver struct to initialize.
 280  *
 281  * Initialize all function pointers of \a r.
 282  */
 283 void udp_recv_init(struct receiver *r)
 284 {
 285         struct udp_recv_args_info dummy;
 286
 287         udp_recv_cmdline_parser_init(&dummy);
 288         r->shutdown = udp_shutdown;
 289         r->open = udp_recv_open;
 290         r->close = udp_recv_close;
 291         r->pre_select = udp_recv_pre_select;
 292         r->post_select = udp_recv_post_select;
 293         r->parse_config = udp_recv_parse_config;
 294         r->help = (struct ggo_help) {
 295                 .short_help = udp_recv_args_info_help,
 296                 .detailed_help = udp_recv_args_info_detailed_help
 297         };
 298         udp_recv_cmdline_parser_free(&dummy);
 299 }