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/*
american fuzzy lop++ - afl-network-client
---------------------------------------
Written by Marc Heuse <mh@mh-sec.de>
Copyright 2019-2020 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
*/
#ifdef __ANDROID__
#include "android-ashmem.h"
#endif
#include "config.h"
#include "types.h"
#include "debug.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <stdint.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <arpa/inet.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
u8 *__afl_area_ptr;
#ifdef __ANDROID__
u32 __afl_map_size = MAP_SIZE;
#else
__thread u32 __afl_map_size = MAP_SIZE;
#endif
/* Error reporting to forkserver controller */
void send_forkserver_error(int error) {
u32 status;
if (!error || error > 0xffff) return;
status = (FS_OPT_ERROR | FS_OPT_SET_ERROR(error));
if (write(FORKSRV_FD + 1, (char *)&status, 4) != 4) return;
}
/* SHM setup. */
static void __afl_map_shm(void) {
char *id_str = getenv(SHM_ENV_VAR);
char *ptr;
if ((ptr = getenv("AFL_MAP_SIZE")) != NULL) {
u32 val = atoi(ptr);
if (val > 0) __afl_map_size = val;
}
if (__afl_map_size > MAP_SIZE) {
if (__afl_map_size > FS_OPT_MAX_MAPSIZE) {
fprintf(stderr,
"Error: AFL++ tools *require* to set AFL_MAP_SIZE to %u to "
"be able to run this instrumented program!\n",
__afl_map_size);
if (id_str) {
send_forkserver_error(FS_ERROR_MAP_SIZE);
exit(-1);
}
} else {
fprintf(stderr,
"Warning: AFL++ tools will need to set AFL_MAP_SIZE to %u to "
"be able to run this instrumented program!\n",
__afl_map_size);
}
}
if (id_str) {
#ifdef USEMMAP
const char * shm_file_path = id_str;
int shm_fd = -1;
unsigned char *shm_base = NULL;
/* create the shared memory segment as if it was a file */
shm_fd = shm_open(shm_file_path, O_RDWR, 0600);
if (shm_fd == -1) {
fprintf(stderr, "shm_open() failed\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
/* map the shared memory segment to the address space of the process */
shm_base =
mmap(0, __afl_map_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
if (shm_base == MAP_FAILED) {
close(shm_fd);
shm_fd = -1;
fprintf(stderr, "mmap() failed\n");
send_forkserver_error(FS_ERROR_MMAP);
exit(2);
}
__afl_area_ptr = shm_base;
#else
u32 shm_id = atoi(id_str);
__afl_area_ptr = shmat(shm_id, 0, 0);
#endif
if (__afl_area_ptr == (void *)-1) {
send_forkserver_error(FS_ERROR_SHMAT);
exit(1);
}
/* Write something into the bitmap so that the parent doesn't give up */
__afl_area_ptr[0] = 1;
}
}
/* Fork server logic. */
static void __afl_start_forkserver(void) {
u8 tmp[4] = {0, 0, 0, 0};
u32 status = 0;
if (__afl_map_size <= FS_OPT_MAX_MAPSIZE)
status |= (FS_OPT_SET_MAPSIZE(__afl_map_size) | FS_OPT_MAPSIZE);
if (status) status |= (FS_OPT_ENABLED);
memcpy(tmp, &status, 4);
/* Phone home and tell the parent that we're OK. */
if (write(FORKSRV_FD + 1, tmp, 4) != 4) return;
}
static u32 __afl_next_testcase(u8 *buf, u32 max_len) {
s32 status, res = 0xffffff;
/* Wait for parent by reading from the pipe. Abort if read fails. */
if (read(FORKSRV_FD, &status, 4) != 4) return 0;
/* we have a testcase - read it */
status = read(0, buf, max_len);
/* report that we are starting the target */
if (write(FORKSRV_FD + 1, &res, 4) != 4) return 0;
if (status < 1)
return 0;
else
return status;
}
static void __afl_end_testcase(void) {
int status = 0xffffff;
if (write(FORKSRV_FD + 1, &status, 4) != 4) exit(1);
}
/* you just need to modify the while() loop in this main() */
int main(int argc, char *argv[]) {
u8 * interface, *buf, *ptr;
s32 s = -1;
struct addrinfo hints, *hres, *aip;
u32 len, max_len = 65536;
if (argc < 3 || argc > 4) {
printf("Syntax: %s host port [max-input-size]\n\n", argv[0]);
printf("Requires host and port of the remote afl-proxy-server instance.\n");
printf(
"IPv4 and IPv6 are supported, also binding to an interface with "
"\"%%\"\n");
printf("The max-input-size default is %u.\n", max_len);
printf(
"The default map size is %u and can be changed with setting "
"AFL_MAP_SIZE.\n",
__afl_map_size);
exit(-1);
}
if ((interface = index(argv[1], '%')) != NULL) *interface++ = 0;
if (argc > 3)
if ((max_len = atoi(argv[3])) < 0)
FATAL("max-input-size may not be negative or larger than 2GB: %s",
argv[3]);
if ((ptr = getenv("AFL_MAP_SIZE")) != NULL)
if ((__afl_map_size = atoi(ptr)) < 8)
FATAL("illegal map size, may not be < 8 or >= 2^30: %s", ptr);
if ((buf = malloc(max_len)) == NULL)
PFATAL("can not allocate %u memory", max_len);
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = PF_UNSPEC;
if (getaddrinfo(argv[1], argv[2], &hints, &hres) != 0)
PFATAL("could not resolve target %s", argv[1]);
for (aip = hres; aip != NULL && s == -1; aip = aip->ai_next) {
if ((s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol)) >= 0) {
#ifdef SO_BINDTODEVICE
if (interface != NULL)
if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, interface,
strlen(interface) + 1) < 0)
fprintf(stderr, "Warning: could not bind to device %s\n", interface);
#else
fprintf(stderr,
"Warning: binding to interface is not supported for your OS\n");
#endif
if (connect(s, aip->ai_addr, aip->ai_addrlen) == -1) s = -1;
}
}
if (s == -1)
FATAL("could not connect to target tcp://%s:%s", argv[1], argv[2]);
/* we initialize the shared memory map and start the forkserver */
__afl_map_shm();
__afl_start_forkserver();
int i = 1, j;
// fprintf(stderr, "Waiting for first testcase\n");
while ((len = __afl_next_testcase(buf, max_len)) > 0) {
// fprintf(stderr, "Sending testcase with len %u\n", len);
if (send(s, &len, 4, 0) != 4) PFATAL("sending size data %d failed", len);
if (send(s, buf, len, 0) != len) PFATAL("sending test data failed");
int received = 0, ret;
while (received < __afl_map_size &&
(ret = recv(s, __afl_area_ptr + received, __afl_map_size - received,
0)) > 0)
received += ret;
if (received != __afl_map_size)
FATAL("did not receive valid data (%d, %d)", received, ret);
// fprintf(stderr, "Received coverage\n");
/* report the test case is done and wait for the next */
__afl_end_testcase();
// fprintf(stderr, "Waiting for next testcase %d\n", ++i);
}
return 0;
}
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