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