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gecko-dev/netwerk/base/nsURLHelper.cpp

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/* -*- 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 "nsURLHelper.h"
#include "nsIFile.h"
#include "nsIURLParser.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsNetCID.h"
#include "mozilla/Preferences.h"
#include "prnetdb.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;
#if !defined(MOZILLA_XPCOMRT_API)
Preferences::AddIntVarCache(&gMaxLength,
"network.standard-url.max-length", 1048576);
#endif
}
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)
{
#if defined(MOZILLA_XPCOMRT_API)
NS_WARNING("net_GetURLSpecFromDir not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
nsAutoCString escPath;
nsresult rv = net_GetURLSpecFromActualFile(aFile, escPath);
if (NS_FAILED(rv))
return rv;
if (escPath.Last() != '/') {
escPath += '/';
}
result = escPath;
return NS_OK;
#endif // defined(MOZILLA_XPCOMRT_API)
}
nsresult
net_GetURLSpecFromFile(nsIFile *aFile, nsACString &result)
{
#if defined(MOZILLA_XPCOMRT_API)
NS_WARNING("net_GetURLSpecFromFile not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
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;
#endif // defined(MOZILLA_XPCOMRT_API)
}
//----------------------------------------------------------------------------
// 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();
uint32_t schemeBeg, schemeEnd;
rv = net_ExtractURLScheme(flatURL, &schemeBeg, &schemeEnd, nullptr);
if (NS_FAILED(rv)) return rv;
if (strncmp(url + schemeBeg, "file", schemeEnd - schemeBeg) != 0) {
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;
// fall through...
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
//----------------------------------------------------------------------------
/* Extract URI-Scheme if possible */
nsresult
net_ExtractURLScheme(const nsACString &inURI,
uint32_t *startPos,
uint32_t *endPos,
nsACString *scheme)
{
// search for something up to a colon, and call it the scheme
const nsPromiseFlatCString &flatURI = PromiseFlatCString(inURI);
const char* uri_start = flatURI.get();
const char* uri = uri_start;
if (!uri)
return NS_ERROR_MALFORMED_URI;
// skip leading white space
while (nsCRT::IsAsciiSpace(*uri))
uri++;
uint32_t start = uri - uri_start;
if (startPos) {
*startPos = start;
}
uint32_t length = 0;
char c;
while ((c = *uri++) != '\0') {
// First char must be Alpha
if (length == 0 && nsCRT::IsAsciiAlpha(c)) {
length++;
}
// Next chars can be alpha + digit + some special chars
else if (length > 0 && (nsCRT::IsAsciiAlpha(c) ||
nsCRT::IsAsciiDigit(c) || c == '+' ||
c == '.' || c == '-')) {
length++;
}
// stop if colon reached but not as first char
else if (c == ':' && length > 0) {
if (endPos) {
*endPos = start + length;
}
if (scheme)
scheme->Assign(Substring(inURI, start, length));
return NS_OK;
}
else
break;
}
return NS_ERROR_MALFORMED_URI;
}
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_FilterURIString(const char *str, nsACString& result)
{
NS_PRECONDITION(str, "Must have a non-null string!");
bool writing = false;
result.Truncate();
const char *p = str;
// Remove leading spaces, tabs, CR, LF if any.
while (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n') {
writing = true;
str = p + 1;
p++;
}
// Don't strip from the scheme, because other code assumes everything
// up to the ':' is the scheme, and it's bad not to have it match.
// If there's no ':', strip.
bool found_colon = false;
const char *first = nullptr;
while (*p) {
switch (*p) {
case '\t':
case '\r':
case '\n':
if (found_colon) {
writing = true;
// append chars up to but not including *p
if (p > str)
result.Append(str, p - str);
str = p + 1;
} else {
// remember where the first \t\r\n was in case we find no scheme
if (!first)
first = p;
}
break;
case ':':
found_colon = true;
break;
case '/':
case '@':
if (!found_colon) {
// colon also has to precede / or @ to be a scheme
found_colon = true; // not really, but means ok to strip
if (first) {
// go back and replace
p = first;
continue; // process *p again
}
}
break;
default:
break;
}
p++;
// At end, if there was no scheme, and we hit a control char, fix
// it up now.
if (!*p && first != nullptr && !found_colon) {
// TRICKY - to avoid duplicating code, we reset the loop back
// to the point we found something to do
p = first;
// This also stops us from looping after we finish
found_colon = true; // so we'll replace \t\r\n
}
}
// Remove trailing spaces if any
while (((p-1) >= str) && (*(p-1) == ' ')) {
writing = true;
p--;
}
if (writing && p > str)
result.Append(str, p - str);
return writing;
}
#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);
}
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