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/*
* Copyright (c) 2019-2021 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 <stdint.h> // uint8_t
#include <stdio.h> // fmemopen
#include <string.h> // strncmp
#include <stdlib.h> // free
#include <unistd.h> // close
#include <fcntl.h> // open flags
#include <unistd.h> // close
#include <unistd.h> // close
#include "wget.h"
#include "connect.h"
#undef fopen_wgetrc
#ifdef __cplusplus
extern "C" {
#endif
#include "retr.h"
// 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"
FILE *fopen_wget(const char *pathname, const char *mode)
{
return fopen("/dev/null", mode);
}
FILE *fopen_wgetrc(const char *pathname, const char *mode)
{
return NULL;
}
#ifdef FUZZING
void exit_wget(int status)
{
}
#endif
static const uint8_t *g_data;
static size_t g_size, g_read;
struct my_context {
int peeklen;
char peekbuf[512];
};
static int my_peek (int fd _GL_UNUSED, char *buf, int bufsize, void *arg, double d)
{
(void) d;
if (g_read < g_size) {
struct my_context *ctx = (struct my_context *) arg;
int n = rand() % (g_size - g_read);
if (n > bufsize)
n = bufsize;
if (n > (int) sizeof(ctx->peekbuf))
n = sizeof(ctx->peekbuf);
memcpy(buf, g_data + g_read, n);
memcpy(ctx->peekbuf, g_data + g_read, n);
g_read += n;
ctx->peeklen=n;
return n;
}
return 0;
}
static int my_read (int fd _GL_UNUSED, char *buf, int bufsize, void *arg, double d)
{
(void) d;
struct my_context *ctx = (struct my_context *) arg;
if (ctx->peeklen) {
/* If we have any peek data, simply return that. */
int copysize = MIN (bufsize, ctx->peeklen);
memcpy (buf, ctx->peekbuf, copysize);
ctx->peeklen -= copysize;
if (ctx->peeklen)
memmove (ctx->peekbuf, ctx->peekbuf + copysize, ctx->peeklen);
return copysize;
}
if (g_read < g_size) {
int n = rand() % (g_size - g_read);
if (n > bufsize)
n = bufsize;
memcpy(buf, g_data + g_read, n);
g_read += n;
return n;
}
return 0;
}
static int my_write (int fd _GL_UNUSED, char *buf _GL_UNUSED, int bufsize, void *arg _GL_UNUSED)
{
return bufsize;
}
static int my_poll (int fd _GL_UNUSED, double timeout _GL_UNUSED, int wait_for _GL_UNUSED, void *arg)
{
struct my_context *ctx = (struct my_context *) arg;
return ctx->peeklen || g_read < g_size;
}
static const char *my_errstr (int fd _GL_UNUSED, void *arg _GL_UNUSED)
{
return "Success";
}
static void my_close (int fd _GL_UNUSED, void *arg _GL_UNUSED)
{
}
static struct transport_implementation my_transport =
{
my_read, my_write, my_poll,
my_peek, my_errstr, my_close
};
/* copied from wget's http.c */
static const char *
response_head_terminator (const char *start, const char *peeked, int peeklen)
{
const char *p, *end;
/* If at first peek, verify whether HUNK starts with "HTTP". If
not, this is a HTTP/0.9 request and we must bail out without
reading anything. */
if (start == peeked && 0 != memcmp (start, "HTTP", MIN (peeklen, 4)))
return start;
/* Look for "\n[\r]\n", and return the following position if found.
Start two chars before the current to cover the possibility that
part of the terminator (e.g. "\n\r") arrived in the previous
batch. */
p = peeked - start < 2 ? start : peeked - 2;
end = peeked + peeklen;
/* Check for \n\r\n or \n\n anywhere in [p, end-2). */
for (; p < end - 2; p++)
if (*p == '\n')
{
if (p[1] == '\r' && p[2] == '\n')
return p + 3;
else if (p[1] == '\n')
return p + 2;
}
/* p==end-2: check for \n\n directly preceding END. */
if (peeklen >= 2 && p[0] == '\n' && p[1] == '\n')
return p + 2;
return NULL;
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
char *hunk;
if (size > 4096) // same as max_len = ... in .options file
return 0;
// CLOSE_STDERR
g_data = data;
g_size = size;
g_read = 0;
struct my_context *ctx = (struct my_context *) calloc(1, sizeof(struct my_context));
fd_register_transport(99, &my_transport, ctx);
while ((hunk = fd_read_hunk(99, response_head_terminator, 512, 65536)))
free(hunk);
connect_cleanup();
free(ctx);
// RESTORE_STDERR
return 0;
}
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