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