Line data Source code
1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /* vim:set ts=4 sw=4 sts=4 et cin: */
3 : /* This Source Code Form is subject to the terms of the Mozilla Public
4 : * License, v. 2.0. If a copy of the MPL was not distributed with this
5 : * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 :
7 : // HttpLog.h should generally be included first
8 : #include "HttpLog.h"
9 :
10 : #include "nsHttp.h"
11 : #include "CacheControlParser.h"
12 : #include "PLDHashTable.h"
13 : #include "mozilla/Mutex.h"
14 : #include "mozilla/HashFunctions.h"
15 : #include "nsCRT.h"
16 : #include "nsHttpRequestHead.h"
17 : #include "nsHttpResponseHead.h"
18 : #include "nsHttpHandler.h"
19 : #include "nsICacheEntry.h"
20 : #include "nsIRequest.h"
21 : #include <errno.h>
22 : #include <functional>
23 :
24 : namespace mozilla {
25 : namespace net {
26 :
27 : // define storage for all atoms
28 : namespace nsHttp {
29 : #define HTTP_ATOM(_name, _value) nsHttpAtom _name = { _value };
30 : #include "nsHttpAtomList.h"
31 : #undef HTTP_ATOM
32 : }
33 :
34 : // find out how many atoms we have
35 : #define HTTP_ATOM(_name, _value) Unused_ ## _name,
36 : enum {
37 : #include "nsHttpAtomList.h"
38 : NUM_HTTP_ATOMS
39 : };
40 : #undef HTTP_ATOM
41 :
42 : // we keep a linked list of atoms allocated on the heap for easy clean up when
43 : // the atom table is destroyed. The structure and value string are allocated
44 : // as one contiguous block.
45 :
46 : struct HttpHeapAtom {
47 : struct HttpHeapAtom *next;
48 : char value[1];
49 : };
50 :
51 : static PLDHashTable *sAtomTable;
52 : static struct HttpHeapAtom *sHeapAtoms = nullptr;
53 : static Mutex *sLock = nullptr;
54 :
55 : HttpHeapAtom *
56 0 : NewHeapAtom(const char *value) {
57 0 : int len = strlen(value);
58 :
59 : HttpHeapAtom *a =
60 0 : reinterpret_cast<HttpHeapAtom *>(malloc(sizeof(*a) + len));
61 0 : if (!a)
62 : return nullptr;
63 0 : memcpy(a->value, value, len + 1);
64 :
65 : // add this heap atom to the list of all heap atoms
66 0 : a->next = sHeapAtoms;
67 0 : sHeapAtoms = a;
68 :
69 0 : return a;
70 : }
71 :
72 : // Hash string ignore case, based on PL_HashString
73 : static PLDHashNumber
74 0 : StringHash(const void *key)
75 : {
76 0 : PLDHashNumber h = 0;
77 0 : for (const char *s = reinterpret_cast<const char*>(key); *s; ++s)
78 0 : h = AddToHash(h, nsCRT::ToLower(*s));
79 0 : return h;
80 : }
81 :
82 : static bool
83 0 : StringCompare(const PLDHashEntryHdr *entry, const void *testKey)
84 : {
85 : const void *entryKey =
86 0 : reinterpret_cast<const PLDHashEntryStub *>(entry)->key;
87 :
88 0 : return PL_strcasecmp(reinterpret_cast<const char *>(entryKey),
89 0 : reinterpret_cast<const char *>(testKey)) == 0;
90 : }
91 :
92 : static const PLDHashTableOps ops = {
93 : StringHash,
94 : StringCompare,
95 : PLDHashTable::MoveEntryStub,
96 : PLDHashTable::ClearEntryStub,
97 : nullptr
98 : };
99 :
100 : // We put the atoms in a hash table for speedy lookup.. see ResolveAtom.
101 : namespace nsHttp {
102 : nsresult
103 0 : CreateAtomTable()
104 : {
105 0 : MOZ_ASSERT(!sAtomTable, "atom table already initialized");
106 :
107 0 : if (!sLock) {
108 0 : sLock = new Mutex("nsHttp.sLock");
109 : }
110 :
111 : // The initial length for this table is a value greater than the number of
112 : // known atoms (NUM_HTTP_ATOMS) because we expect to encounter a few random
113 : // headers right off the bat.
114 0 : sAtomTable = new PLDHashTable(&ops, sizeof(PLDHashEntryStub),
115 0 : NUM_HTTP_ATOMS + 10);
116 :
117 : // fill the table with our known atoms
118 : const char *const atoms[] = {
119 : #define HTTP_ATOM(_name, _value) _name._val,
120 : #include "nsHttpAtomList.h"
121 : #undef HTTP_ATOM
122 : nullptr
123 0 : };
124 :
125 0 : for (int i = 0; atoms[i]; ++i) {
126 : auto stub = static_cast<PLDHashEntryStub*>
127 0 : (sAtomTable->Add(atoms[i], fallible));
128 0 : if (!stub)
129 : return NS_ERROR_OUT_OF_MEMORY;
130 :
131 0 : MOZ_ASSERT(!stub->key, "duplicate static atom");
132 0 : stub->key = atoms[i];
133 : }
134 :
135 : return NS_OK;
136 : }
137 :
138 : void
139 0 : DestroyAtomTable()
140 : {
141 0 : delete sAtomTable;
142 0 : sAtomTable = nullptr;
143 :
144 0 : while (sHeapAtoms) {
145 0 : HttpHeapAtom *next = sHeapAtoms->next;
146 0 : free(sHeapAtoms);
147 0 : sHeapAtoms = next;
148 : }
149 :
150 0 : delete sLock;
151 0 : sLock = nullptr;
152 0 : }
153 :
154 : Mutex *
155 0 : GetLock()
156 : {
157 0 : return sLock;
158 : }
159 :
160 : // this function may be called from multiple threads
161 : nsHttpAtom
162 0 : ResolveAtom(const char *str)
163 : {
164 0 : nsHttpAtom atom = { nullptr };
165 :
166 0 : if (!str || !sAtomTable)
167 0 : return atom;
168 :
169 0 : MutexAutoLock lock(*sLock);
170 :
171 0 : auto stub = static_cast<PLDHashEntryStub*>(sAtomTable->Add(str, fallible));
172 0 : if (!stub)
173 0 : return atom; // out of memory
174 :
175 0 : if (stub->key) {
176 0 : atom._val = reinterpret_cast<const char *>(stub->key);
177 0 : return atom;
178 : }
179 :
180 : // if the atom could not be found in the atom table, then we'll go
181 : // and allocate a new atom on the heap.
182 0 : HttpHeapAtom *heapAtom = NewHeapAtom(str);
183 0 : if (!heapAtom)
184 0 : return atom; // out of memory
185 :
186 0 : stub->key = atom._val = heapAtom->value;
187 0 : return atom;
188 : }
189 :
190 : //
191 : // From section 2.2 of RFC 2616, a token is defined as:
192 : //
193 : // token = 1*<any CHAR except CTLs or separators>
194 : // CHAR = <any US-ASCII character (octets 0 - 127)>
195 : // separators = "(" | ")" | "<" | ">" | "@"
196 : // | "," | ";" | ":" | "\" | <">
197 : // | "/" | "[" | "]" | "?" | "="
198 : // | "{" | "}" | SP | HT
199 : // CTL = <any US-ASCII control character
200 : // (octets 0 - 31) and DEL (127)>
201 : // SP = <US-ASCII SP, space (32)>
202 : // HT = <US-ASCII HT, horizontal-tab (9)>
203 : //
204 : static const char kValidTokenMap[128] = {
205 : 0, 0, 0, 0, 0, 0, 0, 0, // 0
206 : 0, 0, 0, 0, 0, 0, 0, 0, // 8
207 : 0, 0, 0, 0, 0, 0, 0, 0, // 16
208 : 0, 0, 0, 0, 0, 0, 0, 0, // 24
209 :
210 : 0, 1, 0, 1, 1, 1, 1, 1, // 32
211 : 0, 0, 1, 1, 0, 1, 1, 0, // 40
212 : 1, 1, 1, 1, 1, 1, 1, 1, // 48
213 : 1, 1, 0, 0, 0, 0, 0, 0, // 56
214 :
215 : 0, 1, 1, 1, 1, 1, 1, 1, // 64
216 : 1, 1, 1, 1, 1, 1, 1, 1, // 72
217 : 1, 1, 1, 1, 1, 1, 1, 1, // 80
218 : 1, 1, 1, 0, 0, 0, 1, 1, // 88
219 :
220 : 1, 1, 1, 1, 1, 1, 1, 1, // 96
221 : 1, 1, 1, 1, 1, 1, 1, 1, // 104
222 : 1, 1, 1, 1, 1, 1, 1, 1, // 112
223 : 1, 1, 1, 0, 1, 0, 1, 0 // 120
224 : };
225 : bool
226 0 : IsValidToken(const char *start, const char *end)
227 : {
228 0 : if (start == end)
229 : return false;
230 :
231 0 : for (; start != end; ++start) {
232 0 : const unsigned char idx = *start;
233 0 : if (idx > 127 || !kValidTokenMap[idx])
234 : return false;
235 : }
236 :
237 : return true;
238 : }
239 :
240 : const char*
241 0 : GetProtocolVersion(HttpVersion pv)
242 : {
243 0 : switch (pv) {
244 : case HttpVersion::v2_0:
245 : return "h2";
246 : case HttpVersion::v1_0:
247 0 : return "http/1.0";
248 : case HttpVersion::v1_1:
249 0 : return "http/1.1";
250 : default:
251 0 : NS_WARNING(nsPrintfCString("Unkown protocol version: 0x%X. "
252 0 : "Please file a bug", static_cast<uint32_t>(pv)).get());
253 0 : return "http/1.1";
254 : }
255 : }
256 :
257 : // static
258 : void
259 79 : TrimHTTPWhitespace(const nsACString& aSource, nsACString& aDest)
260 : {
261 158 : nsAutoCString str(aSource);
262 :
263 : // HTTP whitespace 0x09: '\t', 0x0A: '\n', 0x0D: '\r', 0x20: ' '
264 : static const char kHTTPWhitespace[] = "\t\n\r ";
265 79 : str.Trim(kHTTPWhitespace);
266 0 : aDest.Assign(str);
267 0 : }
268 :
269 : // static
270 : bool
271 127 : IsReasonableHeaderValue(const nsACString &s)
272 : {
273 : // Header values MUST NOT contain line-breaks. RFC 2616 technically
274 : // permits CTL characters, including CR and LF, in header values provided
275 : // they are quoted. However, this can lead to problems if servers do not
276 : // interpret quoted strings properly. Disallowing CR and LF here seems
277 : // reasonable and keeps things simple. We also disallow a null byte.
278 254 : const nsACString::char_type* end = s.EndReading();
279 0 : for (const nsACString::char_type* i = s.BeginReading(); i != end; ++i) {
280 0 : if (*i == '\r' || *i == '\n' || *i == '\0') {
281 : return false;
282 : }
283 : }
284 : return true;
285 : }
286 :
287 : const char *
288 24 : FindToken(const char *input, const char *token, const char *seps)
289 : {
290 24 : if (!input)
291 : return nullptr;
292 :
293 15 : int inputLen = strlen(input);
294 0 : int tokenLen = strlen(token);
295 :
296 15 : if (inputLen < tokenLen)
297 : return nullptr;
298 :
299 15 : const char *inputTop = input;
300 0 : const char *inputEnd = input + inputLen - tokenLen;
301 0 : for (; input <= inputEnd; ++input) {
302 0 : if (PL_strncasecmp(input, token, tokenLen) == 0) {
303 0 : if (input > inputTop && !strchr(seps, *(input - 1)))
304 : continue;
305 7 : if (input < inputEnd && !strchr(seps, *(input + tokenLen)))
306 : continue;
307 : return input;
308 : }
309 : }
310 :
311 : return nullptr;
312 : }
313 :
314 : bool
315 2 : ParseInt64(const char *input, const char **next, int64_t *r)
316 : {
317 2 : MOZ_ASSERT(input);
318 0 : MOZ_ASSERT(r);
319 :
320 2 : char *end = nullptr;
321 0 : errno = 0; // Clear errno to make sure its value is set by strtoll
322 0 : int64_t value = strtoll(input, &end, /* base */ 10);
323 :
324 : // Fail if: - the parsed number overflows.
325 : // - the end points to the start of the input string.
326 : // - we parsed a negative value. Consumers don't expect that.
327 2 : if (errno != 0 || end == input || value < 0) {
328 0 : LOG(("nsHttp::ParseInt64 value=%" PRId64 " errno=%d", value, errno));
329 : return false;
330 : }
331 :
332 2 : if (next) {
333 0 : *next = end;
334 : }
335 2 : *r = value;
336 0 : return true;
337 : }
338 :
339 : bool
340 0 : IsPermanentRedirect(uint32_t httpStatus)
341 : {
342 0 : return httpStatus == 301 || httpStatus == 308;
343 : }
344 :
345 : bool
346 0 : ValidationRequired(bool isForcedValid, nsHttpResponseHead *cachedResponseHead,
347 : uint32_t loadFlags, bool allowStaleCacheContent,
348 : bool isImmutable, bool customConditionalRequest,
349 : nsHttpRequestHead &requestHead,
350 : nsICacheEntry *entry, CacheControlParser &cacheControlRequest,
351 : bool fromPreviousSession)
352 : {
353 : // Check isForcedValid to see if it is possible to skip validation.
354 : // Don't skip validation if we have serious reason to believe that this
355 : // content is invalid (it's expired).
356 : // See netwerk/cache2/nsICacheEntry.idl for details
357 0 : if (isForcedValid &&
358 0 : (!cachedResponseHead->ExpiresInPast() ||
359 0 : !cachedResponseHead->MustValidateIfExpired())) {
360 0 : LOG(("NOT validating based on isForcedValid being true.\n"));
361 : return false;
362 : }
363 :
364 : // If the LOAD_FROM_CACHE flag is set, any cached data can simply be used
365 0 : if (loadFlags & nsIRequest::LOAD_FROM_CACHE || allowStaleCacheContent) {
366 0 : LOG(("NOT validating based on LOAD_FROM_CACHE load flag\n"));
367 : return false;
368 : }
369 :
370 : // If the VALIDATE_ALWAYS flag is set, any cached data won't be used until
371 : // it's revalidated with the server.
372 0 : if ((loadFlags & nsIRequest::VALIDATE_ALWAYS) && !isImmutable) {
373 0 : LOG(("Validating based on VALIDATE_ALWAYS load flag\n"));
374 : return true;
375 : }
376 :
377 : // Even if the VALIDATE_NEVER flag is set, there are still some cases in
378 : // which we must validate the cached response with the server.
379 0 : if (loadFlags & nsIRequest::VALIDATE_NEVER) {
380 0 : LOG(("VALIDATE_NEVER set\n"));
381 : // if no-store validate cached response (see bug 112564)
382 0 : if (cachedResponseHead->NoStore()) {
383 0 : LOG(("Validating based on no-store logic\n"));
384 : return true;
385 : }
386 0 : LOG(("NOT validating based on VALIDATE_NEVER load flag\n"));
387 : return false;
388 : }
389 :
390 : // check if validation is strictly required...
391 0 : if (cachedResponseHead->MustValidate()) {
392 0 : LOG(("Validating based on MustValidate() returning TRUE\n"));
393 : return true;
394 : }
395 :
396 : // possibly serve from cache for a custom If-Match/If-Unmodified-Since
397 : // conditional request
398 0 : if (customConditionalRequest &&
399 0 : !requestHead.HasHeader(nsHttp::If_Match) &&
400 0 : !requestHead.HasHeader(nsHttp::If_Unmodified_Since)) {
401 0 : LOG(("Validating based on a custom conditional request\n"));
402 : return true;
403 : }
404 :
405 : // previously we also checked for a query-url w/out expiration
406 : // and didn't do heuristic on it. but defacto that is allowed now.
407 : //
408 : // Check if the cache entry has expired...
409 :
410 0 : bool doValidation = true;
411 0 : uint32_t now = NowInSeconds();
412 :
413 0 : uint32_t age = 0;
414 0 : nsresult rv = cachedResponseHead->ComputeCurrentAge(now, now, &age);
415 0 : if (NS_FAILED(rv)) {
416 : return true;
417 : }
418 :
419 0 : uint32_t freshness = 0;
420 0 : rv = cachedResponseHead->ComputeFreshnessLifetime(&freshness);
421 0 : if (NS_FAILED(rv)) {
422 : return true;
423 : }
424 :
425 0 : uint32_t expiration = 0;
426 0 : rv = entry->GetExpirationTime(&expiration);
427 0 : if (NS_FAILED(rv)) {
428 : return true;
429 : }
430 :
431 : uint32_t maxAgeRequest, maxStaleRequest, minFreshRequest;
432 :
433 0 : LOG((" NowInSeconds()=%u, expiration time=%u, freshness lifetime=%u, age=%u",
434 : now, expiration, freshness, age));
435 :
436 0 : if (cacheControlRequest.NoCache()) {
437 0 : LOG((" validating, no-cache request"));
438 : doValidation = true;
439 0 : } else if (cacheControlRequest.MaxStale(&maxStaleRequest)) {
440 0 : uint32_t staleTime = age > freshness ? age - freshness : 0;
441 0 : doValidation = staleTime > maxStaleRequest;
442 0 : LOG((" validating=%d, max-stale=%u requested", doValidation, maxStaleRequest));
443 0 : } else if (cacheControlRequest.MaxAge(&maxAgeRequest)) {
444 : // The input information for age and freshness calculation are in seconds.
445 : // Hence, the internal logic can't have better resolution than seconds too.
446 : // To make max-age=0 case work even for requests made in less than a second
447 : // after the last response has been received, we use >= for compare. This
448 : // is correct because of the rounding down of the age calculated value.
449 0 : doValidation = age >= maxAgeRequest;
450 0 : LOG((" validating=%d, max-age=%u requested", doValidation, maxAgeRequest));
451 0 : } else if (cacheControlRequest.MinFresh(&minFreshRequest)) {
452 0 : uint32_t freshTime = freshness > age ? freshness - age : 0;
453 0 : doValidation = freshTime < minFreshRequest;
454 0 : LOG((" validating=%d, min-fresh=%u requested", doValidation, minFreshRequest));
455 0 : } else if (now < expiration) {
456 0 : doValidation = false;
457 0 : LOG((" not validating, expire time not in the past"));
458 0 : } else if (cachedResponseHead->MustValidateIfExpired()) {
459 : doValidation = true;
460 0 : } else if (loadFlags & nsIRequest::VALIDATE_ONCE_PER_SESSION) {
461 : // If the cached response does not include expiration infor-
462 : // mation, then we must validate the response, despite whether
463 : // or not this is the first access this session. This behavior
464 : // is consistent with existing browsers and is generally expected
465 : // by web authors.
466 0 : if (freshness == 0)
467 : doValidation = true;
468 : else
469 0 : doValidation = fromPreviousSession;
470 : } else {
471 : doValidation = true;
472 : }
473 :
474 0 : LOG(("%salidating based on expiration time\n", doValidation ? "V" : "Not v"));
475 : return doValidation;
476 : }
477 :
478 : nsresult
479 0 : GetHttpResponseHeadFromCacheEntry(nsICacheEntry *entry, nsHttpResponseHead *cachedResponseHead)
480 : {
481 0 : nsCString buf;
482 : // A "original-response-headers" metadata element holds network original headers,
483 : // i.e. the headers in the form as they arrieved from the network.
484 : // We need to get the network original headers first, because we need to keep them
485 : // in order.
486 0 : nsresult rv = entry->GetMetaDataElement("original-response-headers", getter_Copies(buf));
487 0 : if (NS_SUCCEEDED(rv)) {
488 0 : rv = cachedResponseHead->ParseCachedOriginalHeaders((char *) buf.get());
489 0 : if (NS_FAILED(rv)) {
490 0 : LOG((" failed to parse original-response-headers\n"));
491 : }
492 : }
493 :
494 0 : buf.Adopt(nullptr);
495 : // A "response-head" metadata element holds response head, e.g. response status
496 : // line and headers in the form Firefox uses them internally (no dupicate
497 : // headers, etc.).
498 0 : rv = entry->GetMetaDataElement("response-head", getter_Copies(buf));
499 0 : NS_ENSURE_SUCCESS(rv, rv);
500 :
501 : // Parse string stored in a "response-head" metadata element.
502 : // These response headers will be merged with the orignal headers (i.e. the
503 : // headers stored in a "original-response-headers" metadata element).
504 0 : rv = cachedResponseHead->ParseCachedHead(buf.get());
505 0 : NS_ENSURE_SUCCESS(rv, rv);
506 0 : buf.Adopt(nullptr);
507 :
508 0 : return NS_OK;
509 : }
510 :
511 : nsresult
512 0 : CheckPartial(nsICacheEntry* aEntry, int64_t *aSize, int64_t *aContentLength,
513 : nsHttpResponseHead *responseHead)
514 : {
515 : nsresult rv;
516 :
517 0 : rv = aEntry->GetDataSize(aSize);
518 :
519 0 : if (NS_ERROR_IN_PROGRESS == rv) {
520 0 : *aSize = -1;
521 0 : rv = NS_OK;
522 : }
523 :
524 0 : NS_ENSURE_SUCCESS(rv, rv);
525 :
526 0 : if (!responseHead) {
527 : return NS_ERROR_UNEXPECTED;
528 : }
529 :
530 0 : *aContentLength = responseHead->ContentLength();
531 :
532 0 : return NS_OK;
533 : }
534 :
535 : void
536 0 : DetermineFramingAndImmutability(nsICacheEntry *entry,
537 : nsHttpResponseHead *responseHead, bool isHttps,
538 : bool *weaklyFramed, bool *isImmutable)
539 : {
540 0 : nsCString framedBuf;
541 0 : nsresult rv = entry->GetMetaDataElement("strongly-framed", getter_Copies(framedBuf));
542 : // describe this in terms of explicitly weakly framed so as to be backwards
543 : // compatible with old cache contents which dont have strongly-framed makers
544 0 : *weaklyFramed = NS_SUCCEEDED(rv) && framedBuf.EqualsLiteral("0");
545 0 : *isImmutable = !*weaklyFramed && isHttps && responseHead->Immutable();
546 0 : }
547 :
548 : bool
549 0 : IsBeforeLastActiveTabLoadOptimization(TimeStamp const & when)
550 : {
551 0 : return gHttpHandler && gHttpHandler->IsBeforeLastActiveTabLoadOptimization(when);
552 : }
553 :
554 : void
555 0 : NotifyActiveTabLoadOptimization()
556 : {
557 0 : if (gHttpHandler) {
558 0 : gHttpHandler->NotifyActiveTabLoadOptimization();
559 : }
560 0 : }
561 :
562 0 : TimeStamp const GetLastActiveTabLoadOptimizationHit()
563 : {
564 0 : return gHttpHandler ? gHttpHandler->GetLastActiveTabLoadOptimizationHit() : TimeStamp();
565 : }
566 :
567 : void
568 0 : SetLastActiveTabLoadOptimizationHit(TimeStamp const &when)
569 : {
570 0 : if (gHttpHandler) {
571 0 : gHttpHandler->SetLastActiveTabLoadOptimizationHit(when);
572 : }
573 0 : }
574 :
575 : HttpVersion
576 0 : GetHttpVersionFromSpdy(SpdyVersion sv)
577 : {
578 0 : MOZ_DIAGNOSTIC_ASSERT(sv != SpdyVersion::NONE);
579 0 : MOZ_ASSERT(sv == SpdyVersion::HTTP_2);
580 :
581 0 : return HttpVersion::v2_0;
582 : }
583 :
584 : } // namespace nsHttp
585 :
586 :
587 : template<typename T> void
588 0 : localEnsureBuffer(UniquePtr<T[]> &buf, uint32_t newSize,
589 : uint32_t preserve, uint32_t &objSize)
590 : {
591 0 : if (objSize >= newSize)
592 0 : return;
593 :
594 : // Leave a little slop on the new allocation - add 2KB to
595 : // what we need and then round the result up to a 4KB (page)
596 : // boundary.
597 :
598 0 : objSize = (newSize + 2048 + 4095) & ~4095;
599 :
600 : static_assert(sizeof(T) == 1, "sizeof(T) must be 1");
601 0 : auto tmp = MakeUnique<T[]>(objSize);
602 0 : if (preserve) {
603 0 : memcpy(tmp.get(), buf.get(), preserve);
604 : }
605 0 : buf = std::move(tmp);
606 : }
607 :
608 0 : void EnsureBuffer(UniquePtr<char[]> &buf, uint32_t newSize,
609 : uint32_t preserve, uint32_t &objSize)
610 : {
611 0 : localEnsureBuffer<char> (buf, newSize, preserve, objSize);
612 0 : }
613 :
614 0 : void EnsureBuffer(UniquePtr<uint8_t[]> &buf, uint32_t newSize,
615 : uint32_t preserve, uint32_t &objSize)
616 : {
617 0 : localEnsureBuffer<uint8_t> (buf, newSize, preserve, objSize);
618 0 : }
619 :
620 : static bool
621 0 : IsTokenSymbol(signed char chr) {
622 0 : if (chr < 33 || chr == 127 ||
623 0 : chr == '(' || chr == ')' || chr == '<' || chr == '>' ||
624 0 : chr == '@' || chr == ',' || chr == ';' || chr == ':' ||
625 0 : chr == '"' || chr == '/' || chr == '[' || chr == ']' ||
626 0 : chr == '?' || chr == '=' || chr == '{' || chr == '}' || chr == '\\') {
627 : return false;
628 : }
629 0 : return true;
630 : }
631 :
632 0 : ParsedHeaderPair::ParsedHeaderPair(const char *name, int32_t nameLen,
633 : const char *val, int32_t valLen,
634 0 : bool isQuotedValue)
635 : : mName(nsDependentCSubstring(nullptr, 0u))
636 : , mValue(nsDependentCSubstring(nullptr, 0u))
637 0 : , mIsQuotedValue(isQuotedValue)
638 : {
639 0 : if (nameLen > 0) {
640 0 : mName.Rebind(name, name + nameLen);
641 : }
642 0 : if (valLen > 0) {
643 0 : if (mIsQuotedValue) {
644 0 : RemoveQuotedStringEscapes(val, valLen);
645 0 : mValue.Rebind(mUnquotedValue.BeginWriting(), mUnquotedValue.Length());
646 : } else {
647 0 : mValue.Rebind(val, val + valLen);
648 : }
649 : }
650 0 : }
651 :
652 : void
653 0 : ParsedHeaderPair::RemoveQuotedStringEscapes(const char *val, int32_t valLen)
654 : {
655 0 : mUnquotedValue.Truncate();
656 0 : const char *c = val;
657 0 : for (int32_t i = 0; i < valLen; ++i) {
658 0 : if (c[i] == '\\' && c[i + 1]) {
659 0 : ++i;
660 : }
661 0 : mUnquotedValue.Append(c[i]);
662 : }
663 0 : }
664 :
665 : static
666 0 : void Tokenize(const char *input, uint32_t inputLen, const char token,
667 : const std::function<void(const char *, uint32_t)>& consumer)
668 : {
669 : auto trimWhitespace =
670 0 : [] (const char *in, uint32_t inLen, const char **out, uint32_t *outLen) {
671 0 : *out = in;
672 0 : *outLen = inLen;
673 0 : if (inLen == 0) {
674 : return;
675 : }
676 :
677 : // Trim leading space
678 0 : while (nsCRT::IsAsciiSpace(**out)) {
679 0 : (*out)++;
680 0 : --(*outLen);
681 : }
682 :
683 : // Trim tailing space
684 0 : for (const char *i = *out + *outLen - 1; i >= *out; --i) {
685 0 : if (!nsCRT::IsAsciiSpace(*i)) {
686 : break;
687 : }
688 0 : --(*outLen);
689 : }
690 : };
691 :
692 0 : const char *first = input;
693 0 : bool inQuote = false;
694 0 : const char *result = nullptr;
695 0 : uint32_t resultLen = 0;
696 0 : for (uint32_t index = 0; index < inputLen; ++index) {
697 0 : if (inQuote && input[index] == '\\' && input[index + 1]) {
698 : index++;
699 : continue;
700 : }
701 0 : if (input[index] == '"') {
702 0 : inQuote = !inQuote;
703 0 : continue;
704 : }
705 0 : if (inQuote) {
706 : continue;
707 : }
708 0 : if (input[index] == token) {
709 0 : trimWhitespace(first, (input + index) - first,
710 0 : &result, &resultLen);
711 0 : consumer(result, resultLen);
712 0 : first = input + index + 1;
713 : }
714 : }
715 :
716 0 : trimWhitespace(first, (input + inputLen) - first,
717 0 : &result, &resultLen);
718 0 : consumer(result, resultLen);
719 0 : }
720 :
721 0 : ParsedHeaderValueList::ParsedHeaderValueList(const char *t,
722 : uint32_t len,
723 0 : bool allowInvalidValue)
724 : {
725 0 : if (!len) {
726 0 : return;
727 : }
728 :
729 0 : ParsedHeaderValueList *self = this;
730 0 : auto consumer = [=] (const char *output, uint32_t outputLength) {
731 0 : self->ParseNameAndValue(output, allowInvalidValue);
732 0 : };
733 :
734 0 : Tokenize(t, len, ';', consumer);
735 : }
736 :
737 : void
738 0 : ParsedHeaderValueList::ParseNameAndValue(const char *input, bool allowInvalidValue)
739 : {
740 0 : const char *nameStart = input;
741 0 : const char *nameEnd = nullptr;
742 0 : const char *valueStart = input;
743 0 : const char *valueEnd = nullptr;
744 0 : bool isQuotedString = false;
745 0 : bool invalidValue = false;
746 :
747 0 : for (; *input && *input != ';' && *input != ',' &&
748 0 : !nsCRT::IsAsciiSpace(*input) && *input != '='; input++)
749 : ;
750 :
751 0 : nameEnd = input;
752 :
753 0 : if (!(nameEnd - nameStart)) {
754 : return;
755 : }
756 :
757 : // Check whether param name is a valid token.
758 0 : for (const char *c = nameStart; c < nameEnd; c++) {
759 0 : if (!IsTokenSymbol(*c)) {
760 : nameEnd = c;
761 : break;
762 : }
763 : }
764 :
765 0 : if (!(nameEnd - nameStart)) {
766 : return;
767 : }
768 :
769 0 : while (nsCRT::IsAsciiSpace(*input)) {
770 0 : ++input;
771 : }
772 :
773 0 : if (!*input || *input++ != '=') {
774 0 : mValues.AppendElement(ParsedHeaderPair(nameStart, nameEnd - nameStart,
775 0 : nullptr, 0, false));
776 0 : return;
777 : }
778 :
779 0 : while (nsCRT::IsAsciiSpace(*input)) {
780 0 : ++input;
781 : }
782 :
783 0 : if (*input != '"') {
784 : // The value is a token, not a quoted string.
785 : valueStart = input;
786 0 : for (valueEnd = input;
787 0 : *valueEnd && !nsCRT::IsAsciiSpace (*valueEnd) &&
788 0 : *valueEnd != ';' && *valueEnd != ',';
789 : valueEnd++)
790 : ;
791 0 : input = valueEnd;
792 0 : if (!allowInvalidValue) {
793 0 : for (const char *c = valueStart; c < valueEnd; c++) {
794 0 : if (!IsTokenSymbol(*c)) {
795 : valueEnd = c;
796 : break;
797 : }
798 : }
799 : }
800 : } else {
801 0 : bool foundQuotedEnd = false;
802 0 : isQuotedString = true;
803 :
804 0 : ++input;
805 0 : valueStart = input;
806 0 : for (valueEnd = input; *valueEnd; ++valueEnd) {
807 0 : if (*valueEnd == '\\' && *(valueEnd + 1)) {
808 0 : ++valueEnd;
809 : }
810 0 : else if (*valueEnd == '"') {
811 : foundQuotedEnd = true;
812 : break;
813 : }
814 : }
815 0 : if (!foundQuotedEnd) {
816 0 : invalidValue = true;
817 : }
818 :
819 0 : input = valueEnd;
820 : // *valueEnd != null means that *valueEnd is quote character.
821 : if (*valueEnd) {
822 : input++;
823 : }
824 : }
825 :
826 0 : if (invalidValue) {
827 0 : valueEnd = valueStart;
828 : }
829 :
830 0 : mValues.AppendElement(ParsedHeaderPair(nameStart, nameEnd - nameStart,
831 0 : valueStart, valueEnd - valueStart,
832 0 : isQuotedString));
833 : }
834 :
835 0 : ParsedHeaderValueListList::ParsedHeaderValueListList(const nsCString &fullHeader,
836 0 : bool allowInvalidValue)
837 0 : : mFull(fullHeader)
838 : {
839 0 : auto &values = mValues;
840 : auto consumer =
841 0 : [&values, allowInvalidValue] (const char *output, uint32_t outputLength) {
842 0 : values.AppendElement(ParsedHeaderValueList(output,
843 : outputLength,
844 0 : allowInvalidValue));
845 0 : };
846 :
847 0 : Tokenize(mFull.BeginReading(), mFull.Length(), ',', consumer);
848 0 : }
849 :
850 0 : void LogCallingScriptLocation(void* instance)
851 : {
852 0 : if (!LOG4_ENABLED()) {
853 0 : return;
854 : }
855 :
856 0 : JSContext* cx = nsContentUtils::GetCurrentJSContext();
857 0 : if (!cx) {
858 : return;
859 : }
860 :
861 : nsAutoCString fileNameString;
862 : uint32_t line = 0, col = 0;
863 : if (!nsJSUtils::GetCallingLocation(cx, fileNameString, &line, &col)) {
864 : return;
865 : }
866 :
867 : LOG(("%p called from script: %s:%u:%u", instance, fileNameString.get(), line, col));
868 : }
869 :
870 : } // namespace net
871 : } // namespace mozilla
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