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/*
* html.c: a libFuzzer target to test several HTML parser interfaces.
*
* See Copyright for the status of this software.
*/
#include <libxml/HTMLparser.h>
#include <libxml/HTMLtree.h>
#include <libxml/catalog.h>
#include "fuzz.h"
int
LLVMFuzzerInitialize(int *argc ATTRIBUTE_UNUSED,
char ***argv ATTRIBUTE_UNUSED) {
xmlFuzzMemSetup();
xmlInitParser();
#ifdef LIBXML_CATALOG_ENABLED
xmlInitializeCatalog();
xmlCatalogSetDefaults(XML_CATA_ALLOW_NONE);
#endif
return 0;
}
int
LLVMFuzzerTestOneInput(const char *data, size_t size) {
xmlParserCtxtPtr ctxt;
htmlDocPtr doc;
const char *docBuffer;
size_t failurePos, docSize;
int opts;
xmlFuzzDataInit(data, size);
opts = (int) xmlFuzzReadInt(4);
failurePos = xmlFuzzReadInt(4) % (size + 100);
docBuffer = xmlFuzzReadRemaining(&docSize);
if (docBuffer == NULL) {
xmlFuzzDataCleanup();
return(0);
}
/* Pull parser */
xmlFuzzInjectFailure(failurePos);
ctxt = htmlNewParserCtxt();
if (ctxt != NULL) {
xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
doc = htmlCtxtReadMemory(ctxt, docBuffer, docSize, NULL, NULL, opts);
xmlFuzzCheckFailureReport("htmlCtxtReadMemory",
ctxt->errNo == XML_ERR_NO_MEMORY,
ctxt->errNo == XML_IO_EIO);
if (doc != NULL) {
xmlDocPtr copy;
#ifdef LIBXML_OUTPUT_ENABLED
xmlOutputBufferPtr out;
const xmlChar *content;
/*
* Also test the serializer. Call htmlDocContentDumpOutput with our
* own buffer to avoid encoding the output. The HTML encoding is
* excruciatingly slow (see htmlEntityValueLookup).
*/
out = xmlAllocOutputBuffer(NULL);
htmlDocContentDumpOutput(out, doc, NULL);
content = xmlOutputBufferGetContent(out);
xmlOutputBufferClose(out);
xmlFuzzCheckFailureReport("htmlDocContentDumpOutput",
content == NULL, 0);
#endif
copy = xmlCopyDoc(doc, 1);
xmlFuzzCheckFailureReport("xmlCopyNode", copy == NULL, 0);
xmlFreeDoc(copy);
xmlFreeDoc(doc);
}
htmlFreeParserCtxt(ctxt);
}
/* Push parser */
#ifdef LIBXML_PUSH_ENABLED
{
static const size_t maxChunkSize = 128;
size_t consumed, chunkSize;
xmlFuzzInjectFailure(failurePos);
ctxt = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL,
XML_CHAR_ENCODING_NONE);
if (ctxt != NULL) {
xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
htmlCtxtUseOptions(ctxt, opts);
for (consumed = 0; consumed < docSize; consumed += chunkSize) {
chunkSize = docSize - consumed;
if (chunkSize > maxChunkSize)
chunkSize = maxChunkSize;
htmlParseChunk(ctxt, docBuffer + consumed, chunkSize, 0);
}
htmlParseChunk(ctxt, NULL, 0, 1);
xmlFuzzCheckFailureReport("htmlParseChunk",
ctxt->errNo == XML_ERR_NO_MEMORY,
ctxt->errNo == XML_IO_EIO);
xmlFreeDoc(ctxt->myDoc);
htmlFreeParserCtxt(ctxt);
}
}
#endif
/* Cleanup */
xmlFuzzInjectFailure(0);
xmlFuzzDataCleanup();
xmlResetLastError();
return(0);
}
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