3 #include <netinet/in.h>
5 #include <sys/socket.h>
12 #ifndef SO_MAX_PACING_RATE
13 #define SO_MAX_PACING_RATE 47
18 Client::Client(int sock)
21 request.reserve(1024);
23 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &connect_time) == -1) {
24 log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
28 // Find the remote address, and convert it to ASCII.
30 socklen_t addr_len = sizeof(addr);
32 if (getpeername(sock, reinterpret_cast<sockaddr *>(&addr), &addr_len) == -1) {
33 log_perror("getpeername");
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");
48 if (inet_ntop(addr.sin6_family, &addr.sin6_addr, buf, sizeof(buf)) == nullptr) {
49 log_perror("inet_ntop");
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()),
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())
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)");
81 if (serialized.has_header_or_short_response_old()) {
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();
90 connect_time.tv_sec = serialized.connect_time_sec();
91 connect_time.tv_nsec = serialized.connect_time_nsec();
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");
101 tls_data_to_send = tls_get_write_buffer(tls_context, &tls_data_left_to_send);
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;
108 tls_data_to_send += serialized.tls_output_bytes_already_consumed();
109 tls_data_left_to_send -= serialized.tls_output_bytes_already_consumed();
111 in_ktls_mode = serialized.in_ktls_mode();
114 tls_context = nullptr;
118 ClientProto Client::serialize(unordered_map<const string *, size_t> *short_response_pool) const
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);
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);
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);
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.
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",
159 string *serialized_context = serialized.mutable_tls_context();
160 serialized_context->resize(required_size);
162 int ret = tls_export_context(tls_context,
163 reinterpret_cast<unsigned char *>(&(*serialized_context)[0]),
164 serialized_context->size(),
166 assert(ret == required_size);
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);
177 assert(tls_data_to_send + tls_data_left_to_send == base_tls_data_to_send + base_tls_data_left_to_send);
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);
189 string escape_string(const string &str) {
191 for (size_t i = 0; i < str.size(); ++i) {
193 if (isprint(str[i]) && str[i] >= 32 && str[i] != '"' && str[i] != '\\') {
194 ret.push_back(str[i]);
196 snprintf(buf, sizeof(buf), "\\x%02x", (unsigned char)str[i]);
205 ClientStats Client::get_stats() const
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;