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

   1 #include <stdio.h>
   2 #include <arpa/inet.h>
   3 #include <netinet/in.h>
   4 #include <stdint.h>
   5 #include <sys/socket.h>
   6
   7 #include "client.h"
   8 #include "log.h"
   9 #include "state.pb.h"
  10 #include "stream.h"
  11
  12 #ifndef SO_MAX_PACING_RATE
  13 #define SO_MAX_PACING_RATE 47
  14 #endif
  15
  16 using namespace std;
  17
  18 Client::Client(int sock)
  19         : sock(sock)
  20 {
  21         request.reserve(1024);
  22
  23         // Find the remote address, and convert it to ASCII.
  24         sockaddr_in6 addr;
  25         socklen_t addr_len = sizeof(addr);
  26
  27         if (getpeername(sock, reinterpret_cast<sockaddr *>(&addr), &addr_len) == -1) {
  28                 log_perror("getpeername");
  29                 remote_addr = "";
  30                 return;
  31         }
  32
  33         char buf[INET6_ADDRSTRLEN];
  34         if (IN6_IS_ADDR_V4MAPPED(&addr.sin6_addr)) {
  35                 // IPv4 address, really.
  36                 if (inet_ntop(AF_INET, &addr.sin6_addr.s6_addr32[3], buf, sizeof(buf)) == nullptr) {
  37                         log_perror("inet_ntop");
  38                         remote_addr = "";
  39                 } else {
  40                         remote_addr = buf;
  41                 }
  42         } else {
  43                 if (inet_ntop(addr.sin6_family, &addr.sin6_addr, buf, sizeof(buf)) == nullptr) {
  44                         log_perror("inet_ntop");
  45                         remote_addr = "";
  46                 } else {
  47                         remote_addr = buf;
  48                 }
  49         }
  50 }
  51
  52 Client::Client(const ClientProto &serialized, const vector<shared_ptr<const string>> &short_responses, Stream *stream)
  53         : sock(serialized.sock()),
  54           remote_addr(serialized.remote_addr()),
  55           referer(serialized.referer()),
  56           user_agent(serialized.user_agent()),
  57           x_playback_session_id(serialized.x_playback_session_id()),
  58           state(State(serialized.state())),
  59           request(serialized.request()),
  60           url(serialized.url()),
  61           stream(stream),
  62           header_or_short_response_bytes_sent(serialized.header_or_short_response_bytes_sent()),
  63           stream_pos(serialized.stream_pos()),
  64           stream_pos_end(serialized.stream_pos_end()),
  65           bytes_sent(serialized.bytes_sent()),
  66           bytes_lost(serialized.bytes_lost()),
  67           num_loss_events(serialized.num_loss_events())
  68 {
  69         if (stream != nullptr) {
  70                 if (setsockopt(sock, SOL_SOCKET, SO_MAX_PACING_RATE, &stream->pacing_rate, sizeof(stream->pacing_rate)) == -1) {
  71                         if (stream->pacing_rate != ~0U) {
  72                                 log_perror("setsockopt(SO_MAX_PACING_RATE)");
  73                         }
  74                 }
  75         }
  76
  77         if (serialized.has_header_or_short_response_old()) {
  78                 // Pre-1.4.0.
  79                 header_or_short_response_holder = serialized.header_or_short_response_old();
  80                 header_or_short_response = &header_or_short_response_holder;
  81         } else if (serialized.has_header_or_short_response_index()) {
  82                 assert(size_t(serialized.header_or_short_response_index()) < short_responses.size());
  83                 header_or_short_response_ref = short_responses[serialized.header_or_short_response_index()];
  84                 header_or_short_response = header_or_short_response_ref.get();
  85         }
  86         connect_time.tv_sec = serialized.connect_time_sec();
  87         connect_time.tv_nsec = serialized.connect_time_nsec();
  88
  89         in_ktls_mode = false;
  90         if (serialized.has_tls_context()) {
  91                 tls_context = tls_import_context(
  92                         reinterpret_cast<const unsigned char *>(serialized.tls_context().data()),
  93                         serialized.tls_context().size());
  94                 if (tls_context == nullptr) {
  95                         log(WARNING, "tls_import_context() failed, TLS client might not survive across restart");
  96                 } else {
  97                         tls_data_to_send = tls_get_write_buffer(tls_context, &tls_data_left_to_send);
  98
  99                         assert(serialized.tls_output_bytes_already_consumed() <= tls_data_left_to_send);
 100                         if (serialized.tls_output_bytes_already_consumed() >= tls_data_left_to_send) {
 101                                 tls_buffer_clear(tls_context);
 102                                 tls_data_to_send = nullptr;
 103                         } else {
 104                                 tls_data_to_send += serialized.tls_output_bytes_already_consumed();
 105                                 tls_data_left_to_send -= serialized.tls_output_bytes_already_consumed();
 106                         }
 107                         in_ktls_mode = serialized.in_ktls_mode();
 108                 }
 109         } else {
 110                 tls_context = nullptr;
 111         }
 112 }
 113
 114 ClientProto Client::serialize(unordered_map<const string *, size_t> *short_response_pool) const
 115 {
 116         ClientProto serialized;
 117         serialized.set_sock(sock);
 118         serialized.set_remote_addr(remote_addr);
 119         serialized.set_referer(referer);
 120         serialized.set_user_agent(user_agent);
 121         serialized.set_x_playback_session_id(x_playback_session_id);
 122         serialized.set_connect_time_sec(connect_time.tv_sec);
 123         serialized.set_connect_time_nsec(connect_time.tv_nsec);
 124         serialized.set_state(state);
 125         serialized.set_request(request);
 126         serialized.set_url(url);
 127
 128         if (header_or_short_response != nullptr) {
 129                 // See if this string is already in the pool (deduplicated by the pointer); if not, insert it.
 130                 auto iterator_and_inserted = short_response_pool->emplace(
 131                         header_or_short_response, short_response_pool->size());
 132                 serialized.set_header_or_short_response_index(iterator_and_inserted.first->second);
 133         }
 134
 135         serialized.set_header_or_short_response_bytes_sent(serialized.header_or_short_response_bytes_sent());
 136         serialized.set_stream_pos(stream_pos);
 137         serialized.set_stream_pos_end(stream_pos_end);
 138         serialized.set_bytes_sent(bytes_sent);
 139         serialized.set_bytes_lost(bytes_lost);
 140         serialized.set_num_loss_events(num_loss_events);
 141
 142         if (tls_context != nullptr) {
 143                 bool small_version = false;
 144                 int required_size = tls_export_context(tls_context, nullptr, 0, small_version);
 145                 if (required_size <= 0) {
 146                         // Can happen if we're in the middle of the key exchange, unfortunately.
 147                         // We'll get an error fairly fast, and this client hasn't started playing
 148                         // anything yet, so just log the error and continue.
 149                         //
 150                         // In theory, we could still rescue it if we had sent _zero_ bytes,
 151                         // by doing an entirely new TLS context, but it's an edge case
 152                         // that's not really worth it.
 153                         log(WARNING, "tls_export_context() failed (returned %d), TLS client might not survive across restart",
 154                                 required_size);
 155                 } else {
 156                         string *serialized_context = serialized.mutable_tls_context();
 157                         serialized_context->resize(required_size);
 158
 159                         int ret = tls_export_context(tls_context,
 160                                 reinterpret_cast<unsigned char *>(&(*serialized_context)[0]),
 161                                 serialized_context->size(),
 162                                 small_version);
 163                         assert(ret == required_size);
 164
 165                         // tls_export_context() has exported the contents of the write buffer, but it doesn't
 166                         // know how much of that we've consumed, so we need to figure that out by ourselves.
 167                         // In a sense, it's unlikely that this will ever be relevant, though, since TLSe can't
 168                         // currently serialize in-progress key exchanges.
 169                         unsigned base_tls_data_left_to_send;
 170                         const unsigned char *base_tls_data_to_send = tls_get_write_buffer(tls_context, &base_tls_data_left_to_send);
 171                         if (base_tls_data_to_send == nullptr) {
 172                                 assert(tls_data_to_send == nullptr);
 173                         } else {
 174                                 assert(tls_data_to_send + tls_data_left_to_send == base_tls_data_to_send + base_tls_data_left_to_send);
 175                         }
 176                         serialized.set_tls_output_bytes_already_consumed(tls_data_to_send - base_tls_data_to_send);
 177                         serialized.set_in_ktls_mode(in_ktls_mode);
 178                 }
 179         }
 180
 181         return serialized;
 182 }
 183
 184 namespace {
 185
 186 string escape_string(const string &str) {
 187         string ret;
 188         for (size_t i = 0; i < str.size(); ++i) {
 189                 char buf[16];
 190                 if (isprint(str[i]) && str[i] >= 32 && str[i] != '"' && str[i] != '\\') {
 191                         ret.push_back(str[i]);
 192                 } else {
 193                         snprintf(buf, sizeof(buf), "\\x%02x", (unsigned char)str[i]);
 194                         ret += buf;
 195                 }
 196         }
 197         return ret;
 198 }
 199
 200 } // namespace
 201
 202 ClientStats Client::get_stats() const
 203 {
 204         ClientStats stats;
 205         if (url.empty()) {
 206                 stats.url = "-";
 207         } else {
 208                 stats.url = url;
 209         }
 210         stats.sock = sock;
 211         stats.remote_addr = remote_addr;
 212         stats.referer = escape_string(referer);
 213         stats.user_agent = escape_string(user_agent);
 214         stats.connect_time = connect_time;
 215         stats.bytes_sent = bytes_sent;
 216         stats.bytes_lost = bytes_lost;
 217         stats.num_loss_events = num_loss_events;
 218         stats.hls_zombie_key = get_hls_zombie_key();
 219         return stats;
 220 }