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/*
* Copyright (c) 2017-2024 Free Software Foundation, Inc.
*
* This file is part of GNU Wget.
*
* GNU Wget is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GNU Wget is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Wget. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <sys/types.h>
#include <dirent.h> // opendir, readdir
#include <stdint.h> // uint8_t
#include <stdio.h> // fmemopen
#include <string.h> // strncmp
#include <fcntl.h> // open flags
#include <unistd.h> // close
#include <setjmp.h> // longjmp, setjmp
#include <stdbool.h> // longjmp, setjmp
#ifdef __cplusplus
extern "C" {
#endif
// declarations for wget internal functions
int main_wget(int argc, const char **argv);
void cleanup(void);
FILE *fopen_wget(const char *pathname, const char *mode);
FILE *fopen_wgetrc(const char *pathname, const char *mode);
void exit_wget(int status);
#ifdef __cplusplus
}
#endif
#include "fuzzer.h"
static const uint8_t *g_data;
static size_t g_size;
FILE *fopen_wget(const char *pathname, const char *mode)
{
return fopen("/dev/null", mode);
}
FILE *fopen_wgetrc(const char *pathname, const char *mode)
{
#ifdef HAVE_FMEMOPEN
return fmemopen((void *) g_data, g_size, mode);
#else
return NULL;
#endif
}
static bool fuzzing;
static jmp_buf jmpbuf;
#ifdef FUZZING
void exit_wget(int status)
{
longjmp(jmpbuf, 1);
}
#endif
#if defined HAVE_DLFCN_H
#include <dlfcn.h> // dlsym
#include <dlfcn.h>
#include <sys/socket.h>
#include <netdb.h>
#if defined __OpenBSD__ || defined __FreeBSD__
#include <netinet/in.h>
#endif
#ifndef RTLD_NEXT
#define RTLD_NEXT RTLD_GLOBAL
#endif
void exit(int status)
{
if (fuzzing) {
longjmp(jmpbuf, 1);
} else {
void (*libc_exit)(int) = (void(*)(int)) dlsym (RTLD_NEXT, "exit");
libc_exit(status);
}
}
int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res)
{
if (fuzzing) {
return -1;
}
int(*libc_getaddrinfo)(const char *, const char *, const struct addrinfo *, struct addrinfo **) =
(int(*)(const char *, const char *, const struct addrinfo *, struct addrinfo **)) dlsym (RTLD_NEXT, "getaddrinfo");
return libc_getaddrinfo(node, service, hints, res);
}
#endif
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
static const char *argv[] = { "wget", "-q" };
if (size > 2048) // same as max_len = ... in .options file
return 0;
g_data = data;
g_size = size;
CLOSE_STDERR
fuzzing = true;
if (setjmp(jmpbuf)) {
cleanup();
goto done;
}
main_wget(sizeof(argv)/sizeof(argv[0]), argv);
done:
fuzzing = false;
RESTORE_STDERR
return 0;
}
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