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