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