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           close_after_response(serialized.close_after_response()),
  63           http_11(serialized.http_11()),
  64           header_or_short_response_bytes_sent(serialized.header_or_short_response_bytes_sent()),
  65           stream_pos(serialized.stream_pos()),
  66           stream_pos_end(serialized.stream_pos_end()),
  67           bytes_sent(serialized.bytes_sent()),
  68           bytes_lost(serialized.bytes_lost()),
  69           num_loss_events(serialized.num_loss_events())
  70 {
  71         if (stream != nullptr) {
  72                 if (setsockopt(sock, SOL_SOCKET, SO_MAX_PACING_RATE, &stream->pacing_rate, sizeof(stream->pacing_rate)) == -1) {
  73                         if (stream->pacing_rate != ~0U) {
  74                                 log_perror("setsockopt(SO_MAX_PACING_RATE)");
  75                         }
  76                 }
  77         }
  78
  79         if (serialized.has_header_or_short_response_old()) {
  80                 // Pre-1.4.0.
  81                 header_or_short_response_holder = serialized.header_or_short_response_old();
  82                 header_or_short_response = &header_or_short_response_holder;
  83         } else if (serialized.has_header_or_short_response_index()) {
  84                 assert(size_t(serialized.header_or_short_response_index()) < short_responses.size());
  85                 header_or_short_response_ref = short_responses[serialized.header_or_short_response_index()];
  86                 header_or_short_response = header_or_short_response_ref.get();
  87         }
  88         connect_time.tv_sec = serialized.connect_time_sec();
  89         connect_time.tv_nsec = serialized.connect_time_nsec();
  90
  91         in_ktls_mode = false;
  92         if (serialized.has_tls_context()) {
  93                 tls_context = tls_import_context(
  94                         reinterpret_cast<const unsigned char *>(serialized.tls_context().data()),
  95                         serialized.tls_context().size());
  96                 if (tls_context == nullptr) {
  97                         log(WARNING, "tls_import_context() failed, TLS client might not survive across restart");
  98                 } else {
  99                         tls_data_to_send = tls_get_write_buffer(tls_context, &tls_data_left_to_send);
 100
 101                         assert(serialized.tls_output_bytes_already_consumed() <= tls_data_left_to_send);
 102                         if (serialized.tls_output_bytes_already_consumed() >= tls_data_left_to_send) {
 103                                 tls_buffer_clear(tls_context);
 104                                 tls_data_to_send = nullptr;
 105                         } else {
 106                                 tls_data_to_send += serialized.tls_output_bytes_already_consumed();
 107                                 tls_data_left_to_send -= serialized.tls_output_bytes_already_consumed();
 108                         }
 109                         in_ktls_mode = serialized.in_ktls_mode();
 110                 }
 111         } else {
 112                 tls_context = nullptr;
 113         }
 114 }
 115
 116 ClientProto Client::serialize(unordered_map<const string *, size_t> *short_response_pool) const
 117 {
 118         ClientProto serialized;
 119         serialized.set_sock(sock);
 120         serialized.set_remote_addr(remote_addr);
 121         serialized.set_referer(referer);
 122         serialized.set_user_agent(user_agent);
 123         serialized.set_x_playback_session_id(x_playback_session_id);
 124         serialized.set_connect_time_sec(connect_time.tv_sec);
 125         serialized.set_connect_time_nsec(connect_time.tv_nsec);
 126         serialized.set_state(state);
 127         serialized.set_request(request);
 128         serialized.set_url(url);
 129
 130         if (header_or_short_response != nullptr) {
 131                 // See if this string is already in the pool (deduplicated by the pointer); if not, insert it.
 132                 auto iterator_and_inserted = short_response_pool->emplace(
 133                         header_or_short_response, short_response_pool->size());
 134                 serialized.set_header_or_short_response_index(iterator_and_inserted.first->second);
 135         }
 136
 137         serialized.set_header_or_short_response_bytes_sent(header_or_short_response_bytes_sent);
 138         serialized.set_stream_pos(stream_pos);
 139         serialized.set_stream_pos_end(stream_pos_end);
 140         serialized.set_bytes_sent(bytes_sent);
 141         serialized.set_bytes_lost(bytes_lost);
 142         serialized.set_num_loss_events(num_loss_events);
 143         serialized.set_http_11(http_11);
 144         serialized.set_close_after_response(close_after_response);
 145
 146         if (tls_context != nullptr) {
 147                 bool small_version = false;
 148                 int required_size = tls_export_context(tls_context, nullptr, 0, small_version);
 149                 if (required_size <= 0) {
 150                         // Can happen if we're in the middle of the key exchange, unfortunately.
 151                         // We'll get an error fairly fast, and this client hasn't started playing
 152                         // anything yet, so just log the error and continue.
 153                         //
 154                         // In theory, we could still rescue it if we had sent _zero_ bytes,
 155                         // by doing an entirely new TLS context, but it's an edge case
 156                         // that's not really worth it.
 157                         log(WARNING, "tls_export_context() failed (returned %d), TLS client might not survive across restart",
 158                                 required_size);
 159                 } else {
 160                         string *serialized_context = serialized.mutable_tls_context();
 161                         serialized_context->resize(required_size);
 162
 163                         int ret = tls_export_context(tls_context,
 164                                 reinterpret_cast<unsigned char *>(&(*serialized_context)[0]),
 165                                 serialized_context->size(),
 166                                 small_version);
 167                         assert(ret == required_size);
 168
 169                         // tls_export_context() has exported the contents of the write buffer, but it doesn't
 170                         // know how much of that we've consumed, so we need to figure that out by ourselves.
 171                         // In a sense, it's unlikely that this will ever be relevant, though, since TLSe can't
 172                         // currently serialize in-progress key exchanges.
 173                         unsigned base_tls_data_left_to_send;
 174                         const unsigned char *base_tls_data_to_send = tls_get_write_buffer(tls_context, &base_tls_data_left_to_send);
 175                         if (base_tls_data_to_send == nullptr) {
 176                                 assert(tls_data_to_send == nullptr);
 177                         } else {
 178                                 assert(tls_data_to_send + tls_data_left_to_send == base_tls_data_to_send + base_tls_data_left_to_send);
 179                         }
 180                         serialized.set_tls_output_bytes_already_consumed(tls_data_to_send - base_tls_data_to_send);
 181                         serialized.set_in_ktls_mode(in_ktls_mode);
 182                 }
 183         }
 184
 185         return serialized;
 186 }
 187
 188 namespace {
 189
 190 string escape_string(const string &str) {
 191         string ret;
 192         for (size_t i = 0; i < str.size(); ++i) {
 193                 char buf[16];
 194                 if (isprint(str[i]) && str[i] >= 32 && str[i] != '"' && str[i] != '\\') {
 195                         ret.push_back(str[i]);
 196                 } else {
 197                         snprintf(buf, sizeof(buf), "\\x%02x", (unsigned char)str[i]);
 198                         ret += buf;
 199                 }
 200         }
 201         return ret;
 202 }
 203
 204 } // namespace
 205
 206 ClientStats Client::get_stats() const
 207 {
 208         ClientStats stats;
 209         if (url.empty()) {
 210                 stats.url = "-";
 211         } else {
 212                 stats.url = url;
 213         }
 214         stats.sock = sock;
 215         stats.remote_addr = remote_addr;
 216         stats.referer = escape_string(referer);
 217         stats.user_agent = escape_string(user_agent);
 218         stats.connect_time = connect_time;
 219         stats.bytes_sent = bytes_sent;
 220         stats.bytes_lost = bytes_lost;
 221         stats.num_loss_events = num_loss_events;
 222         stats.hls_zombie_key = get_hls_zombie_key();
 223         return stats;
 224 }