From c05e4efbe9b4e7d1ff078b7a392621f2ca7572e6 Mon Sep 17 00:00:00 2001 From: vanhauser-thc Date: Tue, 1 Dec 2020 14:40:30 +0100 Subject: renamed examples/ to utils/ --- utils/afl_network_proxy/afl-network-client.c | 415 +++++++++++++++++++++++++++ 1 file changed, 415 insertions(+) create mode 100644 utils/afl_network_proxy/afl-network-client.c (limited to 'utils/afl_network_proxy/afl-network-client.c') diff --git a/utils/afl_network_proxy/afl-network-client.c b/utils/afl_network_proxy/afl-network-client.c new file mode 100644 index 00000000..a2451fdc --- /dev/null +++ b/utils/afl_network_proxy/afl-network-client.c @@ -0,0 +1,415 @@ +/* + american fuzzy lop++ - afl-network-client + --------------------------------------- + + Written by Marc Heuse + + 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 +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#ifndef USEMMAP + #include +#endif +#include +#include +#include +#include +#include + +#ifdef USE_DEFLATE + #include +#endif + +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 = 0x0fffffff; // res is a dummy pid + + /* 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(int status) { + + 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 * lenptr, max_len = 65536; +#ifdef USE_DEFLATE + u8 * buf2; + u32 * lenptr1, *lenptr2, buf2_len, compress_len; + size_t decompress_len; +#endif + + 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 = strchr(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 + 4)) == NULL) + PFATAL("can not allocate %u memory", max_len + 4); + lenptr = (u32 *)buf; + +#ifdef USE_DEFLATE + buf2_len = (max_len > __afl_map_size ? max_len : __afl_map_size); + if ((buf2 = malloc(buf2_len + 8)) == NULL) + PFATAL("can not allocate %u memory", buf2_len + 8); + lenptr1 = (u32 *)buf2; + lenptr2 = (u32 *)(buf2 + 4); +#endif + + 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 + +#ifdef SO_PRIORITY + int priority = 7; + if (setsockopt(s, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < + 0) { + + priority = 6; + if (setsockopt(s, SOL_SOCKET, SO_PRIORITY, &priority, + sizeof(priority)) < 0) + WARNF("could not set priority on socket"); + + } + +#endif + + if (connect(s, aip->ai_addr, aip->ai_addrlen) == -1) s = -1; + + } + + } + +#ifdef USE_DEFLATE + struct libdeflate_compressor *compressor; + compressor = libdeflate_alloc_compressor(1); + struct libdeflate_decompressor *decompressor; + decompressor = libdeflate_alloc_decompressor(); + fprintf(stderr, "Compiled with compression support\n"); +#endif + + if (s == -1) + FATAL("could not connect to target tcp://%s:%s", argv[1], argv[2]); + else + fprintf(stderr, "Connected to target tcp://%s:%s\n", argv[1], argv[2]); + + /* we initialize the shared memory map and start the forkserver */ + __afl_map_shm(); + __afl_start_forkserver(); + + int i = 1, j, status, ret, received; + + // fprintf(stderr, "Waiting for first testcase\n"); + while ((*lenptr = __afl_next_testcase(buf + 4, max_len)) > 0) { + + // fprintf(stderr, "Sending testcase with len %u\n", *lenptr); +#ifdef USE_DEFLATE + #ifdef COMPRESS_TESTCASES + // we only compress the testcase if it does not fit in the TCP packet + if (*lenptr > 1500 - 20 - 32 - 4) { + + // set highest byte to signify compression + *lenptr1 = (*lenptr | 0xff000000); + *lenptr2 = (u32)libdeflate_deflate_compress(compressor, buf + 4, *lenptr, + buf2 + 8, buf2_len); + if (send(s, buf2, *lenptr2 + 8, 0) != *lenptr2 + 8) + PFATAL("sending test data failed"); + // fprintf(stderr, "COMPRESS (%u->%u):\n", *lenptr, *lenptr2); + // for (u32 i = 0; i < *lenptr; i++) + // fprintf(stderr, "%02x", buf[i + 4]); + // fprintf(stderr, "\n"); + // for (u32 i = 0; i < *lenptr2; i++) + // fprintf(stderr, "%02x", buf2[i + 8]); + // fprintf(stderr, "\n"); + + } else { + + #endif +#endif + if (send(s, buf, *lenptr + 4, 0) != *lenptr + 4) + PFATAL("sending test data failed"); +#ifdef USE_DEFLATE + #ifdef COMPRESS_TESTCASES + // fprintf(stderr, "unCOMPRESS (%u)\n", *lenptr); + + } + + #endif +#endif + + received = 0; + while (received < 4 && + (ret = recv(s, &status + received, 4 - received, 0)) > 0) + received += ret; + if (received != 4) + FATAL("did not receive waitpid data (%d, %d)", received, ret); + // fprintf(stderr, "Received status\n"); + + received = 0; +#ifdef USE_DEFLATE + while (received < 4 && + (ret = recv(s, &compress_len + received, 4 - received, 0)) > 0) + received += ret; + if (received != 4) + FATAL("did not receive compress_len (%d, %d)", received, ret); + // fprintf(stderr, "Received status\n"); + + received = 0; + while (received < compress_len && + (ret = recv(s, buf2 + received, buf2_len - received, 0)) > 0) + received += ret; + if (received != compress_len) + FATAL("did not receive coverage data (%d, %d)", received, ret); + + if (libdeflate_deflate_decompress(decompressor, buf2, compress_len, + __afl_area_ptr, __afl_map_size, + &decompress_len) != LIBDEFLATE_SUCCESS || + decompress_len != __afl_map_size) + FATAL("decompression failed"); + // fprintf(stderr, "DECOMPRESS (%u->%u): ", compress_len, decompress_len); + // for (u32 i = 0; i < __afl_map_size; i++) fprintf(stderr, "%02x", + // __afl_area_ptr[i]); fprintf(stderr, "\n"); +#else + 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 coverage data (%d, %d)", received, ret); +#endif + // fprintf(stderr, "Received coverage\n"); + + /* report the test case is done and wait for the next */ + __afl_end_testcase(status); + // fprintf(stderr, "Waiting for next testcase %d\n", ++i); + + } + +#ifdef USE_DEFLATE + libdeflate_free_compressor(compressor); + libdeflate_free_decompressor(decompressor); +#endif + + return 0; + +} + -- cgit 1.4.1