1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "net/quic/quic_utils.h"
6
7 #include <ctype.h>
8
9 #include <algorithm>
10
11 #include "base/logging.h"
12 #include "base/port.h"
13 #include "base/strings/stringprintf.h"
14 #include "base/strings/string_number_conversions.h"
15 #include "net/spdy/write_blocked_list.h"
16
17 using base::StringPiece;
18 using std::string;
19
20 namespace net {
21
22 // static
FNV1a_64_Hash(const char * data,int len)23 uint64 QuicUtils::FNV1a_64_Hash(const char* data, int len) {
24 static const uint64 kOffset = GG_UINT64_C(14695981039346656037);
25 static const uint64 kPrime = GG_UINT64_C(1099511628211);
26
27 const uint8* octets = reinterpret_cast<const uint8*>(data);
28
29 uint64 hash = kOffset;
30
31 for (int i = 0; i < len; ++i) {
32 hash = hash ^ octets[i];
33 hash = hash * kPrime;
34 }
35
36 return hash;
37 }
38
39 // static
FNV1a_128_Hash(const char * data,int len)40 uint128 QuicUtils::FNV1a_128_Hash(const char* data, int len) {
41 // The following two constants are defined as part of the hash algorithm.
42 // see http://www.isthe.com/chongo/tech/comp/fnv/
43 // 309485009821345068724781371
44 const uint128 kPrime(16777216, 315);
45 // 144066263297769815596495629667062367629
46 const uint128 kOffset(GG_UINT64_C(7809847782465536322),
47 GG_UINT64_C(7113472399480571277));
48
49 const uint8* octets = reinterpret_cast<const uint8*>(data);
50
51 uint128 hash = kOffset;
52
53 for (int i = 0; i < len; ++i) {
54 hash = hash ^ uint128(0, octets[i]);
55 hash = hash * kPrime;
56 }
57
58 return hash;
59 }
60
61 // static
FindMutualTag(const QuicTagVector & our_tags_vector,const QuicTag * their_tags,size_t num_their_tags,Priority priority,QuicTag * out_result,size_t * out_index)62 bool QuicUtils::FindMutualTag(const QuicTagVector& our_tags_vector,
63 const QuicTag* their_tags,
64 size_t num_their_tags,
65 Priority priority,
66 QuicTag* out_result,
67 size_t* out_index) {
68 if (our_tags_vector.empty()) {
69 return false;
70 }
71 const size_t num_our_tags = our_tags_vector.size();
72 const QuicTag* our_tags = &our_tags_vector[0];
73
74 size_t num_priority_tags, num_inferior_tags;
75 const QuicTag* priority_tags;
76 const QuicTag* inferior_tags;
77 if (priority == LOCAL_PRIORITY) {
78 num_priority_tags = num_our_tags;
79 priority_tags = our_tags;
80 num_inferior_tags = num_their_tags;
81 inferior_tags = their_tags;
82 } else {
83 num_priority_tags = num_their_tags;
84 priority_tags = their_tags;
85 num_inferior_tags = num_our_tags;
86 inferior_tags = our_tags;
87 }
88
89 for (size_t i = 0; i < num_priority_tags; i++) {
90 for (size_t j = 0; j < num_inferior_tags; j++) {
91 if (priority_tags[i] == inferior_tags[j]) {
92 *out_result = priority_tags[i];
93 if (out_index) {
94 if (priority == LOCAL_PRIORITY) {
95 *out_index = j;
96 } else {
97 *out_index = i;
98 }
99 }
100 return true;
101 }
102 }
103 }
104
105 return false;
106 }
107
108 // static
SerializeUint128(uint128 v,uint8 * out)109 void QuicUtils::SerializeUint128(uint128 v, uint8* out) {
110 const uint64 lo = Uint128Low64(v);
111 const uint64 hi = Uint128High64(v);
112 // This assumes that the system is little-endian.
113 memcpy(out, &lo, sizeof(lo));
114 memcpy(out + sizeof(lo), &hi, sizeof(hi));
115 }
116
117 // static
SerializeUint128Short(uint128 v,uint8 * out)118 void QuicUtils::SerializeUint128Short(uint128 v, uint8* out) {
119 const uint64 lo = Uint128Low64(v);
120 const uint64 hi = Uint128High64(v);
121 // This assumes that the system is little-endian.
122 memcpy(out, &lo, sizeof(lo));
123 memcpy(out + sizeof(lo), &hi, sizeof(hi) / 2);
124 }
125
126 #define RETURN_STRING_LITERAL(x) \
127 case x: \
128 return #x;
129
130 // static
StreamErrorToString(QuicRstStreamErrorCode error)131 const char* QuicUtils::StreamErrorToString(QuicRstStreamErrorCode error) {
132 switch (error) {
133 RETURN_STRING_LITERAL(QUIC_STREAM_NO_ERROR);
134 RETURN_STRING_LITERAL(QUIC_STREAM_CONNECTION_ERROR);
135 RETURN_STRING_LITERAL(QUIC_ERROR_PROCESSING_STREAM);
136 RETURN_STRING_LITERAL(QUIC_MULTIPLE_TERMINATION_OFFSETS);
137 RETURN_STRING_LITERAL(QUIC_BAD_APPLICATION_PAYLOAD);
138 RETURN_STRING_LITERAL(QUIC_STREAM_PEER_GOING_AWAY);
139 RETURN_STRING_LITERAL(QUIC_STREAM_CANCELLED);
140 RETURN_STRING_LITERAL(QUIC_STREAM_LAST_ERROR);
141 }
142 // Return a default value so that we return this when |error| doesn't match
143 // any of the QuicRstStreamErrorCodes. This can happen when the RstStream
144 // frame sent by the peer (attacker) has invalid error code.
145 return "INVALID_RST_STREAM_ERROR_CODE";
146 }
147
148 // static
ErrorToString(QuicErrorCode error)149 const char* QuicUtils::ErrorToString(QuicErrorCode error) {
150 switch (error) {
151 RETURN_STRING_LITERAL(QUIC_NO_ERROR);
152 RETURN_STRING_LITERAL(QUIC_INTERNAL_ERROR);
153 RETURN_STRING_LITERAL(QUIC_STREAM_DATA_AFTER_TERMINATION);
154 RETURN_STRING_LITERAL(QUIC_INVALID_PACKET_HEADER);
155 RETURN_STRING_LITERAL(QUIC_INVALID_FRAME_DATA);
156 RETURN_STRING_LITERAL(QUIC_MISSING_PAYLOAD);
157 RETURN_STRING_LITERAL(QUIC_INVALID_FEC_DATA);
158 RETURN_STRING_LITERAL(QUIC_INVALID_STREAM_DATA);
159 RETURN_STRING_LITERAL(QUIC_INVALID_RST_STREAM_DATA);
160 RETURN_STRING_LITERAL(QUIC_INVALID_CONNECTION_CLOSE_DATA);
161 RETURN_STRING_LITERAL(QUIC_INVALID_GOAWAY_DATA);
162 RETURN_STRING_LITERAL(QUIC_INVALID_ACK_DATA);
163 RETURN_STRING_LITERAL(QUIC_INVALID_CONGESTION_FEEDBACK_DATA);
164 RETURN_STRING_LITERAL(QUIC_INVALID_VERSION_NEGOTIATION_PACKET);
165 RETURN_STRING_LITERAL(QUIC_INVALID_PUBLIC_RST_PACKET);
166 RETURN_STRING_LITERAL(QUIC_DECRYPTION_FAILURE);
167 RETURN_STRING_LITERAL(QUIC_ENCRYPTION_FAILURE);
168 RETURN_STRING_LITERAL(QUIC_PACKET_TOO_LARGE);
169 RETURN_STRING_LITERAL(QUIC_PACKET_FOR_NONEXISTENT_STREAM);
170 RETURN_STRING_LITERAL(QUIC_PEER_GOING_AWAY);
171 RETURN_STRING_LITERAL(QUIC_HANDSHAKE_FAILED);
172 RETURN_STRING_LITERAL(QUIC_CRYPTO_TAGS_OUT_OF_ORDER);
173 RETURN_STRING_LITERAL(QUIC_CRYPTO_TOO_MANY_ENTRIES);
174 RETURN_STRING_LITERAL(QUIC_CRYPTO_TOO_MANY_REJECTS);
175 RETURN_STRING_LITERAL(QUIC_CRYPTO_INVALID_VALUE_LENGTH)
176 RETURN_STRING_LITERAL(QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE);
177 RETURN_STRING_LITERAL(QUIC_CRYPTO_INTERNAL_ERROR);
178 RETURN_STRING_LITERAL(QUIC_CRYPTO_VERSION_NOT_SUPPORTED);
179 RETURN_STRING_LITERAL(QUIC_CRYPTO_NO_SUPPORT);
180 RETURN_STRING_LITERAL(QUIC_INVALID_CRYPTO_MESSAGE_TYPE);
181 RETURN_STRING_LITERAL(QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER);
182 RETURN_STRING_LITERAL(QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND);
183 RETURN_STRING_LITERAL(QUIC_CRYPTO_MESSAGE_PARAMETER_NO_OVERLAP);
184 RETURN_STRING_LITERAL(QUIC_CRYPTO_MESSAGE_INDEX_NOT_FOUND);
185 RETURN_STRING_LITERAL(QUIC_INVALID_STREAM_ID);
186 RETURN_STRING_LITERAL(QUIC_INVALID_PRIORITY);
187 RETURN_STRING_LITERAL(QUIC_TOO_MANY_OPEN_STREAMS);
188 RETURN_STRING_LITERAL(QUIC_PUBLIC_RESET);
189 RETURN_STRING_LITERAL(QUIC_INVALID_VERSION);
190 RETURN_STRING_LITERAL(QUIC_STREAM_RST_BEFORE_HEADERS_DECOMPRESSED);
191 RETURN_STRING_LITERAL(QUIC_INVALID_HEADER_ID);
192 RETURN_STRING_LITERAL(QUIC_INVALID_NEGOTIATED_VALUE);
193 RETURN_STRING_LITERAL(QUIC_DECOMPRESSION_FAILURE);
194 RETURN_STRING_LITERAL(QUIC_CONNECTION_TIMED_OUT);
195 RETURN_STRING_LITERAL(QUIC_ERROR_MIGRATING_ADDRESS);
196 RETURN_STRING_LITERAL(QUIC_PACKET_WRITE_ERROR);
197 RETURN_STRING_LITERAL(QUIC_PACKET_READ_ERROR);
198 RETURN_STRING_LITERAL(QUIC_INVALID_STREAM_FRAME);
199 RETURN_STRING_LITERAL(QUIC_PROOF_INVALID);
200 RETURN_STRING_LITERAL(QUIC_CRYPTO_DUPLICATE_TAG);
201 RETURN_STRING_LITERAL(QUIC_CRYPTO_ENCRYPTION_LEVEL_INCORRECT);
202 RETURN_STRING_LITERAL(QUIC_CRYPTO_SERVER_CONFIG_EXPIRED);
203 RETURN_STRING_LITERAL(QUIC_INVALID_CHANNEL_ID_SIGNATURE);
204 RETURN_STRING_LITERAL(QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED);
205 RETURN_STRING_LITERAL(QUIC_CRYPTO_MESSAGE_WHILE_VALIDATING_CLIENT_HELLO);
206 RETURN_STRING_LITERAL(QUIC_VERSION_NEGOTIATION_MISMATCH);
207 RETURN_STRING_LITERAL(QUIC_LAST_ERROR);
208 // Intentionally have no default case, so we'll break the build
209 // if we add errors and don't put them here.
210 }
211 // Return a default value so that we return this when |error| doesn't match
212 // any of the QuicErrorCodes. This can happen when the ConnectionClose
213 // frame sent by the peer (attacker) has invalid error code.
214 return "INVALID_ERROR_CODE";
215 }
216
217 // static
EncryptionLevelToString(EncryptionLevel level)218 const char* QuicUtils::EncryptionLevelToString(EncryptionLevel level) {
219 switch (level) {
220 RETURN_STRING_LITERAL(ENCRYPTION_NONE);
221 RETURN_STRING_LITERAL(ENCRYPTION_INITIAL);
222 RETURN_STRING_LITERAL(ENCRYPTION_FORWARD_SECURE);
223 RETURN_STRING_LITERAL(NUM_ENCRYPTION_LEVELS);
224 }
225 return "INVALID_ENCRYPTION_LEVEL";
226 }
227
228 // static
TagToString(QuicTag tag)229 string QuicUtils::TagToString(QuicTag tag) {
230 char chars[4];
231 bool ascii = true;
232 const QuicTag orig_tag = tag;
233
234 for (size_t i = 0; i < sizeof(chars); i++) {
235 chars[i] = tag;
236 if ((chars[i] == 0 || chars[i] == '\xff') && i == 3) {
237 chars[i] = ' ';
238 }
239 if (!isprint(static_cast<unsigned char>(chars[i]))) {
240 ascii = false;
241 break;
242 }
243 tag >>= 8;
244 }
245
246 if (ascii) {
247 return string(chars, sizeof(chars));
248 }
249
250 return base::UintToString(orig_tag);
251 }
252
253 // static
StringToHexASCIIDump(StringPiece in_buffer)254 string QuicUtils::StringToHexASCIIDump(StringPiece in_buffer) {
255 int offset = 0;
256 const int kBytesPerLine = 16; // Max bytes dumped per line
257 const char* buf = in_buffer.data();
258 int bytes_remaining = in_buffer.size();
259 string s; // our output
260 const char* p = buf;
261 while (bytes_remaining > 0) {
262 const int line_bytes = std::min(bytes_remaining, kBytesPerLine);
263 base::StringAppendF(&s, "0x%04x: ", offset); // Do the line header
264 for (int i = 0; i < kBytesPerLine; ++i) {
265 if (i < line_bytes) {
266 base::StringAppendF(&s, "%02x", static_cast<unsigned char>(p[i]));
267 } else {
268 s += " "; // two-space filler instead of two-space hex digits
269 }
270 if (i % 2) s += ' ';
271 }
272 s += ' ';
273 for (int i = 0; i < line_bytes; ++i) { // Do the ASCII dump
274 s+= (p[i] > 32 && p[i] < 127) ? p[i] : '.';
275 }
276
277 bytes_remaining -= line_bytes;
278 offset += line_bytes;
279 p += line_bytes;
280 s += '\n';
281 }
282 return s;
283 }
284
285 // static
LowestPriority()286 QuicPriority QuicUtils::LowestPriority() {
287 return static_cast<QuicPriority>(kLowestPriority);
288 }
289
290 // static
HighestPriority()291 QuicPriority QuicUtils::HighestPriority() {
292 return static_cast<QuicPriority>(kHighestPriority);
293 }
294
295 } // namespace net
296