git.sesse.net Git - cubemap/blob - udpinput.cpp

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <poll.h>
   4 #include <stddef.h>
   5 #include <stdlib.h>
   6 #include <sys/socket.h>
   7 #include <time.h>
   8 #include <unistd.h>
   9 #include <math.h>
  10 #include <string>
  11
  12 #include "acceptor.h"
  13 #include "log.h"
  14 #include "serverpool.h"
  15 #include "state.pb.h"
  16 #include "stream.h"
  17 #include "udpinput.h"
  18 #include "util.h"
  19 #include "version.h"
  20
  21 using namespace std;
  22
  23 extern ServerPool *servers;
  24
  25 namespace {
  26
  27 // Similar to parse_hostport(), but only parses the IP address,
  28 // and does not use mapped-v4 addresses, since multicast seems
  29 // to not like that too much.
  30 bool parse_ip_address(const string &ip, sockaddr_storage *addr)
  31 {
  32         memset(addr, 0, sizeof(*addr));
  33
  34         assert(!ip.empty());
  35         if (ip[0] == '[') {
  36                 sockaddr_in6 *addr6 = (sockaddr_in6 *)addr;
  37                 addr6->sin6_family = AF_INET6;
  38                 if (ip[ip.size() - 1] != ']') {
  39                         log(ERROR, "address '%s' is malformed; must be either [ipv6addr] or ipv4addr",
  40                                 ip.c_str());
  41                         return false;
  42                 }
  43                 string raw_ip(ip.begin() + 1, ip.end() - 1);
  44                 if (inet_pton(AF_INET6, raw_ip.c_str(), &addr6->sin6_addr) != 1) {
  45                         log(ERROR, "'%s' is not a valid IPv6 address", raw_ip.c_str());
  46                         return false;
  47                 }
  48         } else {
  49                 sockaddr_in *addr4 = (sockaddr_in *)addr;
  50                 addr4->sin_family = AF_INET;
  51                 if (inet_pton(AF_INET, ip.c_str(), &addr4->sin_addr) != 1) {
  52                         log(ERROR, "'%s' is not a valid IPv4 address");
  53                         return false;
  54                 }
  55         }
  56
  57         return true;
  58 }
  59
  60 bool maybe_join_multicast_group(int sock, const string &group, const string &source)
  61 {
  62         if (group.empty()) {
  63                 // Not multicast.
  64                 return true;
  65         }
  66
  67         // Join the given multicast group (ASM or SSM).
  68         // TODO: Also support sources apart from multicast groups,
  69         // e.g. udp://[::1]:1234 for only receiving from localhost.
  70         if (!source.empty()) {
  71                 // Single-Source Multicast (SSM).
  72                 group_source_req gsr;
  73                 memset(&gsr, 0, sizeof(gsr));
  74                 if (!parse_ip_address(group, &gsr.gsr_group)) {
  75                         return false;
  76                 }
  77                 if (!parse_ip_address(source, &gsr.gsr_source)) {
  78                         return false;
  79                 }
  80                 int level = (gsr.gsr_group.ss_family == AF_INET) ? SOL_IP : SOL_IPV6;
  81                 if (setsockopt(sock, level, MCAST_JOIN_SOURCE_GROUP, &gsr, sizeof(gsr)) == -1) {
  82                         log_perror("setsockopt(MCAST_JOIN_SOURCE_GROUP)");
  83                         return false;
  84                 }
  85         } else {
  86                 // Any-Source Multicast (ASM).
  87                 group_req gr;
  88                 memset(&gr, 0, sizeof(gr));
  89                 if (!parse_ip_address(group, &gr.gr_group)) {
  90                         return false;
  91                 }
  92                 int level = (gr.gr_group.ss_family == AF_INET) ? SOL_IP : SOL_IPV6;
  93                 if (setsockopt(sock, level, MCAST_JOIN_GROUP, &gr, sizeof(gr)) == -1) {
  94                         log_perror("setsockopt(MCAST_JOIN_GROUP)");
  95                         return false;
  96                 }
  97         }
  98
  99         return true;
 100 }
 101
 102 }  // namespace
 103
 104 UDPInput::UDPInput(const string &url)
 105         : url(url),
 106           sock(-1)
 107 {
 108         // Should be verified by the caller.
 109         string protocol;
 110         bool ok = parse_url(url, &protocol, &user, &host, &port, &path);
 111         assert(ok);
 112
 113         construct_header();
 114
 115         stats.url = url;
 116         stats.connect_time = time(nullptr);
 117 }
 118
 119 UDPInput::UDPInput(const InputProto &serialized)
 120         : url(serialized.url()),
 121           sock(serialized.sock())
 122 {
 123         // Should be verified by the caller.
 124         string protocol;
 125         bool ok = parse_url(url, &protocol, &user, &host, &port, &path);
 126         assert(ok);
 127
 128         construct_header();
 129
 130         stats.url = url;
 131         stats.bytes_received = serialized.bytes_received();
 132         stats.data_bytes_received = serialized.data_bytes_received();
 133         if (serialized.has_connect_time()) {
 134                 stats.connect_time = serialized.connect_time();
 135         } else {
 136                 stats.connect_time = time(nullptr);
 137         }
 138 }
 139
 140 InputProto UDPInput::serialize() const
 141 {
 142         InputProto serialized;
 143         serialized.set_url(url);
 144         serialized.set_sock(sock);
 145         serialized.set_bytes_received(stats.bytes_received);
 146         serialized.set_data_bytes_received(stats.data_bytes_received);
 147         serialized.set_connect_time(stats.connect_time);
 148         serialized.set_is_metacube_encoded(false);
 149         return serialized;
 150 }
 151
 152 void UDPInput::close_socket()
 153 {
 154         safe_close(sock);
 155         sock = -1;
 156 }
 157
 158 void UDPInput::construct_header()
 159 {
 160         http_header =
 161                 "HTTP/1.0 200 OK\r\n"
 162                 "Content-type: application/octet-stream\r\n"
 163                 "Cache-control: no-cache\r\n"
 164                 "Server: " SERVER_IDENTIFICATION "\r\n"
 165                 "Connection: close\r\n";
 166 }
 167
 168 void UDPInput::add_destination(int stream_index)
 169 {
 170         stream_indices.push_back(stream_index);
 171         servers->set_header(stream_index, http_header, "");
 172 }
 173
 174 void UDPInput::do_work()
 175 {
 176         while (!should_stop()) {
 177                 if (sock == -1) {
 178                         int port_num = atoi(port.c_str());
 179                         sockaddr_in6 addr = create_any_address(port_num);
 180                         sock = create_server_socket(addr, UDP_SOCKET);
 181                         if (sock == -1) {
 182                                 log(WARNING, "[%s] UDP socket creation failed. Waiting 0.2 seconds and trying again...",
 183                                              url.c_str());
 184                                 usleep(200000);
 185                                 continue;
 186                         }
 187
 188                         // The syntax udp://source@group (abusing the username field
 189                         // to store the sender in SSM) seems to be a VLC invention.
 190                         // We mimic it.
 191                         if (!maybe_join_multicast_group(sock, host, user)) {
 192                                 log(WARNING, "[%s] Multicast join failed. Waiting 0.2 seconds and trying again...",
 193                                              url.c_str());
 194                                 safe_close(sock);
 195                                 sock = -1;
 196                                 usleep(200000);
 197                                 continue;
 198                         }
 199                 }
 200
 201                 // Wait for a packet, or a wakeup.
 202                 bool activity = wait_for_activity(sock, POLLIN, nullptr);
 203                 if (!activity) {
 204                         // Most likely, should_stop was set.
 205                         continue;
 206                 }
 207
 208                 int ret;
 209                 do {
 210                         ret = recv(sock, packet_buf, sizeof(packet_buf), 0);
 211                 } while (ret == -1 && errno == EINTR);
 212
 213                 if (ret <= 0) {
 214                         log_perror("recv");
 215                         close_socket();
 216                         continue;
 217                 }
 218
 219                 {
 220                         lock_guard<mutex> lock(stats_mutex);
 221                         stats.bytes_received += ret;
 222                         stats.data_bytes_received += ret;
 223                 }
 224
 225                 for (size_t stream_index : stream_indices) {
 226                         servers->add_data(stream_index, packet_buf, ret, /*metacube_flags=*/0, /*pts=*/RationalPTS());
 227                 }
 228         }
 229 }
 230
 231 InputStats UDPInput::get_stats() const
 232 {
 233         lock_guard<mutex> lock(stats_mutex);
 234         return stats;
 235 }