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 "mutexlock.h"
  15 #include "serverpool.h"
  16 #include "state.pb.h"
  17 #include "stream.h"
  18 #include "udpinput.h"
  19 #include "util.h"
  20 #include "version.h"
  21
  22 using namespace std;
  23
  24 extern ServerPool *servers;
  25
  26 namespace {
  27
  28 // Similar to parse_hostport(), but only parses the IP address,
  29 // and does not use mapped-v4 addresses, since multicast seems
  30 // to not like that too much.
  31 bool parse_ip_address(const string &ip, sockaddr_storage *addr)
  32 {
  33         memset(addr, 0, sizeof(*addr));
  34
  35         assert(!ip.empty());
  36         if (ip[0] == '[') {
  37                 sockaddr_in6 *addr6 = (sockaddr_in6 *)addr;
  38                 addr6->sin6_family = AF_INET6;
  39                 if (ip[ip.size() - 1] != ']') {
  40                         log(ERROR, "address '%s' is malformed; must be either [ipv6addr] or ipv4addr",
  41                                 ip.c_str());
  42                         return false;
  43                 }
  44                 string raw_ip(ip.begin() + 1, ip.end() - 1);
  45                 if (inet_pton(AF_INET6, raw_ip.c_str(), &addr6->sin6_addr) != 1) {
  46                         log(ERROR, "'%s' is not a valid IPv6 address", raw_ip.c_str());
  47                         return false;
  48                 }
  49         } else {
  50                 sockaddr_in *addr4 = (sockaddr_in *)addr;
  51                 addr4->sin_family = AF_INET;
  52                 if (inet_pton(AF_INET, ip.c_str(), &addr4->sin_addr) != 1) {
  53                         log(ERROR, "'%s' is not a valid IPv4 address");
  54                         return false;
  55                 }
  56         }
  57
  58         return true;
  59 }
  60
  61 bool maybe_join_multicast_group(int sock, const string &group, const string &source)
  62 {
  63         if (group.empty()) {
  64                 // Not multicast.
  65                 return true;
  66         }
  67
  68         // Join the given multicast group (ASM or SSM).
  69         // TODO: Also support sources apart from multicast groups,
  70         // e.g. udp://[::1]:1234 for only receiving from localhost.
  71         if (!source.empty()) {
  72                 // Single-Source Multicast (SSM).
  73                 group_source_req gsr;
  74                 memset(&gsr, 0, sizeof(gsr));
  75                 if (!parse_ip_address(group, &gsr.gsr_group)) {
  76                         return false;
  77                 }
  78                 if (!parse_ip_address(source, &gsr.gsr_source)) {
  79                         return false;
  80                 }
  81                 int level = (gsr.gsr_group.ss_family == AF_INET) ? SOL_IP : SOL_IPV6;
  82                 if (setsockopt(sock, level, MCAST_JOIN_SOURCE_GROUP, &gsr, sizeof(gsr)) == -1) {
  83                         log_perror("setsockopt(MCAST_JOIN_SOURCE_GROUP)");
  84                         return false;
  85                 }
  86         } else {
  87                 // Any-Source Multicast (ASM).
  88                 group_req gr;
  89                 memset(&gr, 0, sizeof(gr));
  90                 if (!parse_ip_address(group, &gr.gr_group)) {
  91                         return false;
  92                 }
  93                 int level = (gr.gr_group.ss_family == AF_INET) ? SOL_IP : SOL_IPV6;
  94                 if (setsockopt(sock, level, MCAST_JOIN_GROUP, &gr, sizeof(gr)) == -1) {
  95                         log_perror("setsockopt(MCAST_JOIN_GROUP)");
  96                         return false;
  97                 }
  98         }
  99
 100         return true;
 101 }
 102
 103 }  // namespace
 104
 105 UDPInput::UDPInput(const string &url)
 106         : url(url),
 107           sock(-1)
 108 {
 109         // Should be verified by the caller.
 110         string protocol;
 111         bool ok = parse_url(url, &protocol, &user, &host, &port, &path);
 112         assert(ok);
 113
 114         construct_header();
 115
 116         pthread_mutex_init(&stats_mutex, nullptr);
 117         stats.url = url;
 118         stats.connect_time = time(nullptr);
 119 }
 120
 121 UDPInput::UDPInput(const InputProto &serialized)
 122         : url(serialized.url()),
 123           sock(serialized.sock())
 124 {
 125         // Should be verified by the caller.
 126         string protocol;
 127         bool ok = parse_url(url, &protocol, &user, &host, &port, &path);
 128         assert(ok);
 129
 130         construct_header();
 131
 132         pthread_mutex_init(&stats_mutex, nullptr);
 133         stats.url = url;
 134         stats.bytes_received = serialized.bytes_received();
 135         stats.data_bytes_received = serialized.data_bytes_received();
 136         if (serialized.has_connect_time()) {
 137                 stats.connect_time = serialized.connect_time();
 138         } else {
 139                 stats.connect_time = time(nullptr);
 140         }
 141 }
 142
 143 InputProto UDPInput::serialize() const
 144 {
 145         InputProto serialized;
 146         serialized.set_url(url);
 147         serialized.set_sock(sock);
 148         serialized.set_bytes_received(stats.bytes_received);
 149         serialized.set_data_bytes_received(stats.data_bytes_received);
 150         serialized.set_connect_time(stats.connect_time);
 151         serialized.set_is_metacube_encoded(false);
 152         return serialized;
 153 }
 154
 155 void UDPInput::close_socket()
 156 {
 157         safe_close(sock);
 158         sock = -1;
 159 }
 160
 161 void UDPInput::construct_header()
 162 {
 163         http_header =
 164                 "HTTP/1.0 200 OK\r\n"
 165                 "Content-type: application/octet-stream\r\n"
 166                 "Cache-control: no-cache\r\n"
 167                 "Server: " SERVER_IDENTIFICATION "\r\n"
 168                 "Connection: close\r\n";
 169 }
 170
 171 void UDPInput::add_destination(int stream_index)
 172 {
 173         stream_indices.push_back(stream_index);
 174         servers->set_header(stream_index, http_header, "");
 175 }
 176
 177 void UDPInput::do_work()
 178 {
 179         while (!should_stop()) {
 180                 if (sock == -1) {
 181                         int port_num = atoi(port.c_str());
 182                         sockaddr_in6 addr = create_any_address(port_num);
 183                         sock = create_server_socket(addr, UDP_SOCKET);
 184                         if (sock == -1) {
 185                                 log(WARNING, "[%s] UDP socket creation failed. Waiting 0.2 seconds and trying again...",
 186                                              url.c_str());
 187                                 usleep(200000);
 188                                 continue;
 189                         }
 190
 191                         // The syntax udp://source@group (abusing the username field
 192                         // to store the sender in SSM) seems to be a VLC invention.
 193                         // We mimic it.
 194                         if (!maybe_join_multicast_group(sock, host, user)) {
 195                                 log(WARNING, "[%s] Multicast join failed. Waiting 0.2 seconds and trying again...",
 196                                              url.c_str());
 197                                 safe_close(sock);
 198                                 sock = -1;
 199                                 usleep(200000);
 200                                 continue;
 201                         }
 202                 }
 203
 204                 // Wait for a packet, or a wakeup.
 205                 bool activity = wait_for_activity(sock, POLLIN, nullptr);
 206                 if (!activity) {
 207                         // Most likely, should_stop was set.
 208                         continue;
 209                 }
 210
 211                 int ret;
 212                 do {
 213                         ret = recv(sock, packet_buf, sizeof(packet_buf), 0);
 214                 } while (ret == -1 && errno == EINTR);
 215
 216                 if (ret <= 0) {
 217                         log_perror("recv");
 218                         close_socket();
 219                         continue;
 220                 }
 221
 222                 {
 223                         MutexLock lock(&stats_mutex);
 224                         stats.bytes_received += ret;
 225                         stats.data_bytes_received += ret;
 226                 }
 227
 228                 for (size_t stream_index : stream_indices) {
 229                         servers->add_data(stream_index, packet_buf, ret, /*metacube_flags=*/0);
 230                 }
 231         }
 232 }
 233
 234 InputStats UDPInput::get_stats() const
 235 {
 236         MutexLock lock(&stats_mutex);
 237         return stats;
 238 }