/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* vim:set ts=4 sw=4 sts=4 et cindent: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "mozilla/RangedPtr.h" #include <algorithm> #include <iterator> #include "nsURLHelper.h" #include "nsIFile.h" #include "nsIURLParser.h" #include "nsCOMPtr.h" #include "nsCRT.h" #include "nsNetCID.h" #include "mozilla/Preferences.h" #include "prnetdb.h" #include "mozilla/Tokenizer.h" using namespace mozilla; //---------------------------------------------------------------------------- // Init/Shutdown //---------------------------------------------------------------------------- static bool gInitialized = false; static nsIURLParser *gNoAuthURLParser = nullptr; static nsIURLParser *gAuthURLParser = nullptr; static nsIURLParser *gStdURLParser = nullptr; static int32_t gMaxLength = 1048576; // Default: 1MB static void InitGlobals() { nsCOMPtr<nsIURLParser> parser; parser = do_GetService(NS_NOAUTHURLPARSER_CONTRACTID); NS_ASSERTION(parser, "failed getting 'noauth' url parser"); if (parser) { gNoAuthURLParser = parser.get(); NS_ADDREF(gNoAuthURLParser); } parser = do_GetService(NS_AUTHURLPARSER_CONTRACTID); NS_ASSERTION(parser, "failed getting 'auth' url parser"); if (parser) { gAuthURLParser = parser.get(); NS_ADDREF(gAuthURLParser); } parser = do_GetService(NS_STDURLPARSER_CONTRACTID); NS_ASSERTION(parser, "failed getting 'std' url parser"); if (parser) { gStdURLParser = parser.get(); NS_ADDREF(gStdURLParser); } gInitialized = true; Preferences::AddIntVarCache(&gMaxLength, "network.standard-url.max-length", 1048576); } void net_ShutdownURLHelper() { if (gInitialized) { NS_IF_RELEASE(gNoAuthURLParser); NS_IF_RELEASE(gAuthURLParser); NS_IF_RELEASE(gStdURLParser); gInitialized = false; } } int32_t net_GetURLMaxLength() { return gMaxLength; } //---------------------------------------------------------------------------- // nsIURLParser getters //---------------------------------------------------------------------------- nsIURLParser * net_GetAuthURLParser() { if (!gInitialized) InitGlobals(); return gAuthURLParser; } nsIURLParser * net_GetNoAuthURLParser() { if (!gInitialized) InitGlobals(); return gNoAuthURLParser; } nsIURLParser * net_GetStdURLParser() { if (!gInitialized) InitGlobals(); return gStdURLParser; } //--------------------------------------------------------------------------- // GetFileFromURLSpec implementations //--------------------------------------------------------------------------- nsresult net_GetURLSpecFromDir(nsIFile *aFile, nsACString &result) { nsAutoCString escPath; nsresult rv = net_GetURLSpecFromActualFile(aFile, escPath); if (NS_FAILED(rv)) return rv; if (escPath.Last() != '/') { escPath += '/'; } result = escPath; return NS_OK; } nsresult net_GetURLSpecFromFile(nsIFile *aFile, nsACString &result) { nsAutoCString escPath; nsresult rv = net_GetURLSpecFromActualFile(aFile, escPath); if (NS_FAILED(rv)) return rv; // if this file references a directory, then we need to ensure that the // URL ends with a slash. this is important since it affects the rules // for relative URL resolution when this URL is used as a base URL. // if the file does not exist, then we make no assumption about its type, // and simply leave the URL unmodified. if (escPath.Last() != '/') { bool dir; rv = aFile->IsDirectory(&dir); if (NS_SUCCEEDED(rv) && dir) escPath += '/'; } result = escPath; return NS_OK; } //---------------------------------------------------------------------------- // file:// URL parsing //---------------------------------------------------------------------------- nsresult net_ParseFileURL(const nsACString &inURL, nsACString &outDirectory, nsACString &outFileBaseName, nsACString &outFileExtension) { nsresult rv; if (inURL.Length() > (uint32_t) gMaxLength) { return NS_ERROR_MALFORMED_URI; } outDirectory.Truncate(); outFileBaseName.Truncate(); outFileExtension.Truncate(); const nsPromiseFlatCString &flatURL = PromiseFlatCString(inURL); const char *url = flatURL.get(); nsAutoCString scheme; rv = net_ExtractURLScheme(flatURL, scheme); if (NS_FAILED(rv)) return rv; if (!scheme.EqualsLiteral("file")) { NS_ERROR("must be a file:// url"); return NS_ERROR_UNEXPECTED; } nsIURLParser *parser = net_GetNoAuthURLParser(); NS_ENSURE_TRUE(parser, NS_ERROR_UNEXPECTED); uint32_t pathPos, filepathPos, directoryPos, basenamePos, extensionPos; int32_t pathLen, filepathLen, directoryLen, basenameLen, extensionLen; // invoke the parser to extract the URL path rv = parser->ParseURL(url, flatURL.Length(), nullptr, nullptr, // don't care about scheme nullptr, nullptr, // don't care about authority &pathPos, &pathLen); if (NS_FAILED(rv)) return rv; // invoke the parser to extract filepath from the path rv = parser->ParsePath(url + pathPos, pathLen, &filepathPos, &filepathLen, nullptr, nullptr, // don't care about query nullptr, nullptr); // don't care about ref if (NS_FAILED(rv)) return rv; filepathPos += pathPos; // invoke the parser to extract the directory and filename from filepath rv = parser->ParseFilePath(url + filepathPos, filepathLen, &directoryPos, &directoryLen, &basenamePos, &basenameLen, &extensionPos, &extensionLen); if (NS_FAILED(rv)) return rv; if (directoryLen > 0) outDirectory = Substring(inURL, filepathPos + directoryPos, directoryLen); if (basenameLen > 0) outFileBaseName = Substring(inURL, filepathPos + basenamePos, basenameLen); if (extensionLen > 0) outFileExtension = Substring(inURL, filepathPos + extensionPos, extensionLen); // since we are using a no-auth url parser, there will never be a host // XXX not strictly true... file://localhost/foo/bar.html is a valid URL return NS_OK; } //---------------------------------------------------------------------------- // path manipulation functions //---------------------------------------------------------------------------- // Replace all /./ with a / while resolving URLs // But only till #? void net_CoalesceDirs(netCoalesceFlags flags, char* path) { /* Stolen from the old netlib's mkparse.c. * * modifies a url of the form /foo/../foo1 -> /foo1 * and /foo/./foo1 -> /foo/foo1 * and /foo/foo1/.. -> /foo/ */ char *fwdPtr = path; char *urlPtr = path; char *lastslash = path; uint32_t traversal = 0; uint32_t special_ftp_len = 0; /* Remember if this url is a special ftp one: */ if (flags & NET_COALESCE_DOUBLE_SLASH_IS_ROOT) { /* some schemes (for example ftp) have the speciality that the path can begin // or /%2F to mark the root of the servers filesystem, a simple / only marks the root relative to the user loging in. We remember the length of the marker */ if (nsCRT::strncasecmp(path,"/%2F",4) == 0) special_ftp_len = 4; else if (nsCRT::strncmp(path,"//",2) == 0 ) special_ftp_len = 2; } /* find the last slash before # or ? */ for(; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#'); ++fwdPtr) { } /* found nothing, but go back one only */ /* if there is something to go back to */ if (fwdPtr != path && *fwdPtr == '\0') { --fwdPtr; } /* search the slash */ for(; (fwdPtr != path) && (*fwdPtr != '/'); --fwdPtr) { } lastslash = fwdPtr; fwdPtr = path; /* replace all %2E or %2e with . in the path */ /* but stop at lastchar if non null */ for(; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#') && (*lastslash == '\0' || fwdPtr != lastslash); ++fwdPtr) { if (*fwdPtr == '%' && *(fwdPtr+1) == '2' && (*(fwdPtr+2) == 'E' || *(fwdPtr+2) == 'e')) { *urlPtr++ = '.'; ++fwdPtr; ++fwdPtr; } else { *urlPtr++ = *fwdPtr; } } // Copy remaining stuff past the #?; for (; *fwdPtr != '\0'; ++fwdPtr) { *urlPtr++ = *fwdPtr; } *urlPtr = '\0'; // terminate the url // start again, this time for real fwdPtr = path; urlPtr = path; for(; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#'); ++fwdPtr) { if (*fwdPtr == '/' && *(fwdPtr+1) == '.' && *(fwdPtr+2) == '/' ) { // remove . followed by slash ++fwdPtr; } else if(*fwdPtr == '/' && *(fwdPtr+1) == '.' && *(fwdPtr+2) == '.' && (*(fwdPtr+3) == '/' || *(fwdPtr+3) == '\0' || // This will take care of *(fwdPtr+3) == '?' || // something like foo/bar/..#sometag *(fwdPtr+3) == '#')) { // remove foo/.. // reverse the urlPtr to the previous slash if possible // if url does not allow relative root then drop .. above root // otherwise retain them in the path if(traversal > 0 || !(flags & NET_COALESCE_ALLOW_RELATIVE_ROOT)) { if (urlPtr != path) urlPtr--; // we must be going back at least by one for(;*urlPtr != '/' && urlPtr != path; urlPtr--) ; // null body --traversal; // count back // forward the fwdPtr past the ../ fwdPtr += 2; // if we have reached the beginning of the path // while searching for the previous / and we remember // that it is an url that begins with /%2F then // advance urlPtr again by 3 chars because /%2F already // marks the root of the path if (urlPtr == path && special_ftp_len > 3) { ++urlPtr; ++urlPtr; ++urlPtr; } // special case if we have reached the end // to preserve the last / if (*fwdPtr == '.' && *(fwdPtr+1) == '\0') ++urlPtr; } else { // there are to much /.. in this path, just copy them instead. // forward the urlPtr past the /.. and copying it // However if we remember it is an url that starts with // /%2F and urlPtr just points at the "F" of "/%2F" then do // not overwrite it with the /, just copy .. and move forward // urlPtr. if (special_ftp_len > 3 && urlPtr == path+special_ftp_len-1) ++urlPtr; else *urlPtr++ = *fwdPtr; ++fwdPtr; *urlPtr++ = *fwdPtr; ++fwdPtr; *urlPtr++ = *fwdPtr; } } else { // count the hierachie, but only if we do not have reached // the root of some special urls with a special root marker if (*fwdPtr == '/' && *(fwdPtr+1) != '.' && (special_ftp_len != 2 || *(fwdPtr+1) != '/')) traversal++; // copy the url incrementaly *urlPtr++ = *fwdPtr; } } /* * Now lets remove trailing . case * /foo/foo1/. -> /foo/foo1/ */ if ((urlPtr > (path+1)) && (*(urlPtr-1) == '.') && (*(urlPtr-2) == '/')) urlPtr--; // Copy remaining stuff past the #?; for (; *fwdPtr != '\0'; ++fwdPtr) { *urlPtr++ = *fwdPtr; } *urlPtr = '\0'; // terminate the url } nsresult net_ResolveRelativePath(const nsACString &relativePath, const nsACString &basePath, nsACString &result) { nsAutoCString name; nsAutoCString path(basePath); bool needsDelim = false; if ( !path.IsEmpty() ) { char16_t last = path.Last(); needsDelim = !(last == '/'); } nsACString::const_iterator beg, end; relativePath.BeginReading(beg); relativePath.EndReading(end); bool stop = false; char c; for (; !stop; ++beg) { c = (beg == end) ? '\0' : *beg; //printf("%c [name=%s] [path=%s]\n", c, name.get(), path.get()); switch (c) { case '\0': case '#': case '?': stop = true; MOZ_FALLTHROUGH; case '/': // delimiter found if (name.EqualsLiteral("..")) { // pop path // If we already have the delim at end, then // skip over that when searching for next one to the left int32_t offset = path.Length() - (needsDelim ? 1 : 2); // First check for errors if (offset < 0 ) return NS_ERROR_MALFORMED_URI; int32_t pos = path.RFind("/", false, offset); if (pos >= 0) path.Truncate(pos + 1); else path.Truncate(); } else if (name.IsEmpty() || name.EqualsLiteral(".")) { // do nothing } else { // append name to path if (needsDelim) path += '/'; path += name; needsDelim = true; } name.Truncate(); break; default: // append char to name name += c; } } // append anything left on relativePath (e.g. #..., ;..., ?...) if (c != '\0') path += Substring(--beg, end); result = path; return NS_OK; } //---------------------------------------------------------------------------- // scheme fu //---------------------------------------------------------------------------- static bool isAsciiAlpha(char c) { return nsCRT::IsAsciiAlpha(c); } static bool net_IsValidSchemeChar(const char aChar) { if (nsCRT::IsAsciiAlpha(aChar) || nsCRT::IsAsciiDigit(aChar) || aChar == '+' || aChar == '.' || aChar == '-') { return true; } return false; } /* Extract URI-Scheme if possible */ nsresult net_ExtractURLScheme(const nsACString &inURI, nsACString& scheme) { nsACString::const_iterator start, end; inURI.BeginReading(start); inURI.EndReading(end); // Strip C0 and space from begining while (start != end) { if ((uint8_t) *start > 0x20) { break; } start++; } Tokenizer p(Substring(start, end), "\r\n\t"); p.Record(); if (!p.CheckChar(isAsciiAlpha)) { // First char must be alpha return NS_ERROR_MALFORMED_URI; } while (p.CheckChar(net_IsValidSchemeChar) || p.CheckWhite()) { // Skip valid scheme characters or \r\n\t } if (!p.CheckChar(':')) { return NS_ERROR_MALFORMED_URI; } p.Claim(scheme); scheme.StripChars("\r\n\t"); return NS_OK; } bool net_IsValidScheme(const char *scheme, uint32_t schemeLen) { // first char must be alpha if (!nsCRT::IsAsciiAlpha(*scheme)) return false; // nsCStrings may have embedded nulls -- reject those too for (; schemeLen; ++scheme, --schemeLen) { if (!(nsCRT::IsAsciiAlpha(*scheme) || nsCRT::IsAsciiDigit(*scheme) || *scheme == '+' || *scheme == '.' || *scheme == '-')) return false; } return true; } bool net_IsAbsoluteURL(const nsACString& uri) { nsACString::const_iterator start, end; uri.BeginReading(start); uri.EndReading(end); // Strip C0 and space from begining while (start != end) { if ((uint8_t) *start > 0x20) { break; } start++; } Tokenizer p(Substring(start, end), "\r\n\t"); // First char must be alpha if (!p.CheckChar(isAsciiAlpha)) { return false; } while (p.CheckChar(net_IsValidSchemeChar) || p.CheckWhite()) { // Skip valid scheme characters or \r\n\t } if (!p.CheckChar(':')) { return false; } p.SkipWhites(); if (!p.CheckChar('/')) { return false; } p.SkipWhites(); if (p.CheckChar('/')) { // aSpec is really absolute. Ignore aBaseURI in this case return true; } return false; } void net_FilterURIString(const nsACString& input, nsACString& result) { const char kCharsToStrip[] = "\r\n\t"; result.Truncate(); auto start = input.BeginReading(); auto end = input.EndReading(); // Trim off leading and trailing invalid chars. auto charFilter = [](char c) { return static_cast<uint8_t>(c) > 0x20; }; auto newStart = std::find_if(start, end, charFilter); auto newEnd = std::find_if( std::reverse_iterator<decltype(end)>(end), std::reverse_iterator<decltype(newStart)>(newStart), charFilter).base(); // Check if chars need to be stripped. auto itr = std::find_first_of( newStart, newEnd, std::begin(kCharsToStrip), std::end(kCharsToStrip)); const bool needsStrip = itr != newEnd; // Just use the passed in string rather than creating new copies if no // changes are necessary. if (newStart == start && newEnd == end && !needsStrip) { result = input; return; } result.Assign(Substring(newStart, newEnd)); if (needsStrip) { result.StripChars(kCharsToStrip); } } #if defined(XP_WIN) bool net_NormalizeFileURL(const nsACString &aURL, nsCString &aResultBuf) { bool writing = false; nsACString::const_iterator beginIter, endIter; aURL.BeginReading(beginIter); aURL.EndReading(endIter); const char *s, *begin = beginIter.get(); for (s = begin; s != endIter.get(); ++s) { if (*s == '\\') { writing = true; if (s > begin) aResultBuf.Append(begin, s - begin); aResultBuf += '/'; begin = s + 1; } } if (writing && s > begin) aResultBuf.Append(begin, s - begin); return writing; } #endif //---------------------------------------------------------------------------- // miscellaneous (i.e., stuff that should really be elsewhere) //---------------------------------------------------------------------------- static inline void ToLower(char &c) { if ((unsigned)(c - 'A') <= (unsigned)('Z' - 'A')) c += 'a' - 'A'; } void net_ToLowerCase(char *str, uint32_t length) { for (char *end = str + length; str < end; ++str) ToLower(*str); } void net_ToLowerCase(char *str) { for (; *str; ++str) ToLower(*str); } char * net_FindCharInSet(const char *iter, const char *stop, const char *set) { for (; iter != stop && *iter; ++iter) { for (const char *s = set; *s; ++s) { if (*iter == *s) return (char *) iter; } } return (char *) iter; } char * net_FindCharNotInSet(const char *iter, const char *stop, const char *set) { repeat: for (const char *s = set; *s; ++s) { if (*iter == *s) { if (++iter == stop) break; goto repeat; } } return (char *) iter; } char * net_RFindCharNotInSet(const char *stop, const char *iter, const char *set) { --iter; --stop; if (iter == stop) return (char *) iter; repeat: for (const char *s = set; *s; ++s) { if (*iter == *s) { if (--iter == stop) break; goto repeat; } } return (char *) iter; } #define HTTP_LWS " \t" // Return the index of the closing quote of the string, if any static uint32_t net_FindStringEnd(const nsCString& flatStr, uint32_t stringStart, char stringDelim) { NS_ASSERTION(stringStart < flatStr.Length() && flatStr.CharAt(stringStart) == stringDelim && (stringDelim == '"' || stringDelim == '\''), "Invalid stringStart"); const char set[] = { stringDelim, '\\', '\0' }; do { // stringStart points to either the start quote or the last // escaped char (the char following a '\\') // Write to searchStart here, so that when we get back to the // top of the loop right outside this one we search from the // right place. uint32_t stringEnd = flatStr.FindCharInSet(set, stringStart + 1); if (stringEnd == uint32_t(kNotFound)) return flatStr.Length(); if (flatStr.CharAt(stringEnd) == '\\') { // Hit a backslash-escaped char. Need to skip over it. stringStart = stringEnd + 1; if (stringStart == flatStr.Length()) return stringStart; // Go back to looking for the next escape or the string end continue; } return stringEnd; } while (true); NS_NOTREACHED("How did we get here?"); return flatStr.Length(); } static uint32_t net_FindMediaDelimiter(const nsCString& flatStr, uint32_t searchStart, char delimiter) { do { // searchStart points to the spot from which we should start looking // for the delimiter. const char delimStr[] = { delimiter, '"', '\0' }; uint32_t curDelimPos = flatStr.FindCharInSet(delimStr, searchStart); if (curDelimPos == uint32_t(kNotFound)) return flatStr.Length(); char ch = flatStr.CharAt(curDelimPos); if (ch == delimiter) { // Found delimiter return curDelimPos; } // We hit the start of a quoted string. Look for its end. searchStart = net_FindStringEnd(flatStr, curDelimPos, ch); if (searchStart == flatStr.Length()) return searchStart; ++searchStart; // searchStart now points to the first char after the end of the // string, so just go back to the top of the loop and look for // |delimiter| again. } while (true); NS_NOTREACHED("How did we get here?"); return flatStr.Length(); } // aOffset should be added to aCharsetStart and aCharsetEnd if this // function sets them. static void net_ParseMediaType(const nsACString &aMediaTypeStr, nsACString &aContentType, nsACString &aContentCharset, int32_t aOffset, bool *aHadCharset, int32_t *aCharsetStart, int32_t *aCharsetEnd, bool aStrict) { const nsCString& flatStr = PromiseFlatCString(aMediaTypeStr); const char* start = flatStr.get(); const char* end = start + flatStr.Length(); // Trim LWS leading and trailing whitespace from type. We include '(' in // the trailing trim set to catch media-type comments, which are not at all // standard, but may occur in rare cases. const char* type = net_FindCharNotInSet(start, end, HTTP_LWS); const char* typeEnd = net_FindCharInSet(type, end, HTTP_LWS ";("); const char* charset = ""; const char* charsetEnd = charset; int32_t charsetParamStart = 0; int32_t charsetParamEnd = 0; uint32_t consumed = typeEnd - type; // Iterate over parameters bool typeHasCharset = false; uint32_t paramStart = flatStr.FindChar(';', typeEnd - start); if (paramStart != uint32_t(kNotFound)) { // We have parameters. Iterate over them. uint32_t curParamStart = paramStart + 1; do { uint32_t curParamEnd = net_FindMediaDelimiter(flatStr, curParamStart, ';'); const char* paramName = net_FindCharNotInSet(start + curParamStart, start + curParamEnd, HTTP_LWS); static const char charsetStr[] = "charset="; if (PL_strncasecmp(paramName, charsetStr, sizeof(charsetStr) - 1) == 0) { charset = paramName + sizeof(charsetStr) - 1; charsetEnd = start + curParamEnd; typeHasCharset = true; charsetParamStart = curParamStart - 1; charsetParamEnd = curParamEnd; } consumed = curParamEnd; curParamStart = curParamEnd + 1; } while (curParamStart < flatStr.Length()); } bool charsetNeedsQuotedStringUnescaping = false; if (typeHasCharset) { // Trim LWS leading and trailing whitespace from charset. We include // '(' in the trailing trim set to catch media-type comments, which are // not at all standard, but may occur in rare cases. charset = net_FindCharNotInSet(charset, charsetEnd, HTTP_LWS); if (*charset == '"') { charsetNeedsQuotedStringUnescaping = true; charsetEnd = start + net_FindStringEnd(flatStr, charset - start, *charset); charset++; NS_ASSERTION(charsetEnd >= charset, "Bad charset parsing"); } else { charsetEnd = net_FindCharInSet(charset, charsetEnd, HTTP_LWS ";("); } } // if the server sent "*/*", it is meaningless, so do not store it. // also, if type is the same as aContentType, then just update the // charset. however, if charset is empty and aContentType hasn't // changed, then don't wipe-out an existing aContentCharset. We // also want to reject a mime-type if it does not include a slash. // some servers give junk after the charset parameter, which may // include a comma, so this check makes us a bit more tolerant. if (type != typeEnd && memchr(type, '/', typeEnd - type) != nullptr && (aStrict ? (net_FindCharNotInSet(start + consumed, end, HTTP_LWS) == end) : (strncmp(type, "*/*", typeEnd - type) != 0))) { // Common case here is that aContentType is empty bool eq = !aContentType.IsEmpty() && aContentType.Equals(Substring(type, typeEnd), nsCaseInsensitiveCStringComparator()); if (!eq) { aContentType.Assign(type, typeEnd - type); ToLowerCase(aContentType); } if ((!eq && *aHadCharset) || typeHasCharset) { *aHadCharset = true; if (charsetNeedsQuotedStringUnescaping) { // parameters using the "quoted-string" syntax need // backslash-escapes to be unescaped (see RFC 2616 Section 2.2) aContentCharset.Truncate(); for (const char *c = charset; c != charsetEnd; c++) { if (*c == '\\' && c + 1 != charsetEnd) { // eat escape c++; } aContentCharset.Append(*c); } } else { aContentCharset.Assign(charset, charsetEnd - charset); } if (typeHasCharset) { *aCharsetStart = charsetParamStart + aOffset; *aCharsetEnd = charsetParamEnd + aOffset; } } // Only set a new charset position if this is a different type // from the last one we had and it doesn't already have a // charset param. If this is the same type, we probably want // to leave the charset position on its first occurrence. if (!eq && !typeHasCharset) { int32_t charsetStart = int32_t(paramStart); if (charsetStart == kNotFound) charsetStart = flatStr.Length(); *aCharsetEnd = *aCharsetStart = charsetStart + aOffset; } } } #undef HTTP_LWS void net_ParseContentType(const nsACString &aHeaderStr, nsACString &aContentType, nsACString &aContentCharset, bool *aHadCharset) { int32_t dummy1, dummy2; net_ParseContentType(aHeaderStr, aContentType, aContentCharset, aHadCharset, &dummy1, &dummy2); } void net_ParseContentType(const nsACString &aHeaderStr, nsACString &aContentType, nsACString &aContentCharset, bool *aHadCharset, int32_t *aCharsetStart, int32_t *aCharsetEnd) { // // Augmented BNF (from RFC 2616 section 3.7): // // header-value = media-type *( LWS "," LWS media-type ) // media-type = type "/" subtype *( LWS ";" LWS parameter ) // type = token // subtype = token // parameter = attribute "=" value // attribute = token // value = token | quoted-string // // // Examples: // // text/html // text/html, text/html // text/html,text/html; charset=ISO-8859-1 // text/html,text/html; charset="ISO-8859-1" // text/html;charset=ISO-8859-1, text/html // text/html;charset='ISO-8859-1', text/html // application/octet-stream // *aHadCharset = false; const nsCString& flatStr = PromiseFlatCString(aHeaderStr); // iterate over media-types. Note that ',' characters can happen // inside quoted strings, so we need to watch out for that. uint32_t curTypeStart = 0; do { // curTypeStart points to the start of the current media-type. We want // to look for its end. uint32_t curTypeEnd = net_FindMediaDelimiter(flatStr, curTypeStart, ','); // At this point curTypeEnd points to the spot where the media-type // starting at curTypeEnd ends. Time to parse that! net_ParseMediaType(Substring(flatStr, curTypeStart, curTypeEnd - curTypeStart), aContentType, aContentCharset, curTypeStart, aHadCharset, aCharsetStart, aCharsetEnd, false); // And let's move on to the next media-type curTypeStart = curTypeEnd + 1; } while (curTypeStart < flatStr.Length()); } void net_ParseRequestContentType(const nsACString &aHeaderStr, nsACString &aContentType, nsACString &aContentCharset, bool *aHadCharset) { // // Augmented BNF (from RFC 7231 section 3.1.1.1): // // media-type = type "/" subtype *( OWS ";" OWS parameter ) // type = token // subtype = token // parameter = token "=" ( token / quoted-string ) // // Examples: // // text/html // text/html; charset=ISO-8859-1 // text/html; charset="ISO-8859-1" // application/octet-stream // aContentType.Truncate(); aContentCharset.Truncate(); *aHadCharset = false; const nsCString& flatStr = PromiseFlatCString(aHeaderStr); // At this point curTypeEnd points to the spot where the media-type // starting at curTypeEnd ends. Time to parse that! nsAutoCString contentType, contentCharset; bool hadCharset = false; int32_t dummy1, dummy2; uint32_t typeEnd = net_FindMediaDelimiter(flatStr, 0, ','); if (typeEnd != flatStr.Length()) { // We have some stuff left at the end, so this is not a valid // request Content-Type header. return; } net_ParseMediaType(flatStr, contentType, contentCharset, 0, &hadCharset, &dummy1, &dummy2, true); aContentType = contentType; aContentCharset = contentCharset; *aHadCharset = hadCharset; } bool net_IsValidHostName(const nsCSubstring &host) { const char *end = host.EndReading(); // Use explicit whitelists to select which characters we are // willing to send to lower-level DNS logic. This is more // self-documenting, and can also be slightly faster than the // blacklist approach, since DNS names are the common case, and // the commonest characters will tend to be near the start of // the list. // Whitelist for DNS names (RFC 1035) with extra characters added // for pragmatic reasons "$+_" // see https://bugzilla.mozilla.org/show_bug.cgi?id=355181#c2 if (net_FindCharNotInSet(host.BeginReading(), end, "abcdefghijklmnopqrstuvwxyz" ".-0123456789" "ABCDEFGHIJKLMNOPQRSTUVWXYZ$+_") == end) return true; // Might be a valid IPv6 link-local address containing a percent sign nsAutoCString strhost(host); PRNetAddr addr; return PR_StringToNetAddr(strhost.get(), &addr) == PR_SUCCESS; } bool net_IsValidIPv4Addr(const char *addr, int32_t addrLen) { RangedPtr<const char> p(addr, addrLen); int32_t octet = -1; // means no digit yet int32_t dotCount = 0; // number of dots in the address for (; addrLen; ++p, --addrLen) { if (*p == '.') { dotCount++; if (octet == -1) { // invalid octet return false; } octet = -1; } else if (*p >= '0' && *p <='9') { if (octet == 0) { // leading 0 is not allowed return false; } else if (octet == -1) { octet = *p - '0'; } else { octet *= 10; octet += *p - '0'; if (octet > 255) return false; } } else { // invalid character return false; } } return (dotCount == 3 && octet != -1); } bool net_IsValidIPv6Addr(const char *addr, int32_t addrLen) { RangedPtr<const char> p(addr, addrLen); int32_t digits = 0; // number of digits in current block int32_t colons = 0; // number of colons in a row during parsing int32_t blocks = 0; // number of hexadecimal blocks bool haveZeros = false; // true if double colon is present in the address for (; addrLen; ++p, --addrLen) { if (*p == ':') { if (colons == 0) { if (digits != 0) { digits = 0; blocks++; } } else if (colons == 1) { if (haveZeros) return false; // only one occurrence is allowed haveZeros = true; } else { // too many colons in a row return false; } colons++; } else if ((*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'f') || (*p >= 'A' && *p <= 'F')) { if (colons == 1 && blocks == 0) // starts with a single colon return false; if (digits == 4) // too many digits return false; colons = 0; digits++; } else if (*p == '.') { // check valid IPv4 from the beginning of the last block if (!net_IsValidIPv4Addr(p.get() - digits, addrLen + digits)) return false; return (haveZeros && blocks < 6) || (!haveZeros && blocks == 6); } else { // invalid character return false; } } if (colons == 1) // ends with a single colon return false; if (digits) // there is a block at the end blocks++; return (haveZeros && blocks < 8) || (!haveZeros && blocks == 8); }