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fp_standalone_mode.c
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fp_standalone_mode.c
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#include "fpicker.h"
#include <dirent.h>
#include <sys/wait.h>
void stdln_init(fuzzer_state_t *fstate) {
if (fstate->config->fuzzer_mode == FUZZER_MODE_STANDALONE_PASSIVE) {
// in passive mode we will store collected corpora in the out dir
fstate->config->corpus_dir = fstate->config->out_dir;
}
if (fstate->config->coverage_mode == COVERAGE_MODE_STALKER_SUMMARY) {
fstate->coverage.basic_blocks = (basic_block_t *) malloc(BASIC_BLOCK_MAX_COUNT * sizeof(basic_block_t));
fstate->coverage.basic_block_count = 0;
} else {
fstate->coverage_bitmap = malloc(COVERAGE_BITMAP_SIZE);
plog("[!] Standalone passive in coverage mode AFL bitmap not implemented yet.\n");
do_exit(fstate);
}
fstate->corpus_count = 0;
fstate->last_err = NULL;
if (fstate->config->standalone_mutator == STANDALONE_MUTATOR_CUSTOM) {
// initialize the custom mutation tmp buffer
fstate->custom_mutator_bufsize = CUSTOM_MUTATOR_TMP_BUFSIZE;
fstate->custom_mutator_buf = malloc(fstate->custom_mutator_bufsize);
bzero(fstate->custom_mutator_buf, fstate->custom_mutator_bufsize);
}
}
coverage_t *stdln_parse_coverage_from_json(JsonArray *arr) {
guint len = json_array_get_length(arr);
coverage_t *cov = malloc(sizeof(coverage_t));
cov->basic_block_count = len;
basic_block_t *blocks = malloc(sizeof(basic_block_t) * len);
for (int i = 0; i < len; i++) {
JsonArray *entry = json_array_get_array_element(arr, i);
blocks[i].start = strtol(json_array_get_string_element(entry, 0), NULL, 0);
blocks[i].end= strtol(json_array_get_string_element(entry, 1), NULL, 0);
}
cov->basic_blocks = blocks;
return cov;
}
corpus_entry_t *stdln_parse_corpus_from_json(JsonObject *obj) {
corpus_entry_t *corp = NULL;
gsize b64_len = 0;
const char *data = NULL;
char *data_dec = NULL;
data = json_object_get_string_member(obj, "data");
if (data == NULL) {
return corp;
}
corp = malloc(sizeof(corpus_entry_t));
data_dec = (char *)g_base64_decode(data, &b64_len);
corp->data = malloc(b64_len + 1);
bzero(corp->data, b64_len + 1);
memcpy(corp->data, data_dec, b64_len);
corp->length = b64_len;
corp->name = malloc(64);
bzero(corp->name, 64);
snprintf(corp->name, 64, "passive-%ld", time(NULL));
g_free(data_dec);
return corp;
}
module_t *stdln_parse_modules_from_json(JsonArray *arr) {
guint len = json_array_get_length(arr);
// TODO: for now we only consider the first module (the fuzzed binary itself)
// in the future we might want to let the user specify which modules should
// be considered, e.g. by providing a list as parameter
len = 1;
module_t *last_mod = NULL;
module_t *first_mod = NULL;
for (int i = 0; i < len; i++) {
JsonObject *obj = json_array_get_object_element(arr, i);
module_t *mod = malloc(sizeof(module_t));
const char *name = json_object_get_string_member(obj, "path");
const char *start = json_object_get_string_member(obj, "base");
const char *end = json_object_get_string_member(obj, "end");
size_t len = strlen(name) + 1;
mod->name = malloc(len);
strncpy(mod->name, name, len);
mod->name[len-1] = 0;
plog("[*] MODULE=%s, start=%s, end=%s\n", name, start, end);
mod->start = strtol(start, NULL, 0);
mod->end = strtol(end, NULL, 0);
mod->next = NULL;
if (last_mod == NULL) {
first_mod = mod;
last_mod = mod;
} else {
last_mod->next = mod;
last_mod = last_mod->next;
}
}
return first_mod;
}
void free_corpus(corpus_entry_t *corp) {
if (corp == NULL) return;
free(corp->data);
free(corp->name);
free(corp);
}
void free_cov(coverage_t *cov) {
if (cov == NULL) return;
free(cov->basic_blocks);
free(cov);
}
void stdln_add_corpus_entry(fuzzer_state_t *fstate, uint8_t *content, long fsize, char *name) {
corpus_entry_t *corp = malloc(sizeof(corpus_entry_t));
corp->data = malloc(fsize);
memcpy(corp->data, content, fsize);
size_t name_len = strlen(name) + 1;
corp->name = malloc(name_len);
bzero(corp->name, name_len);
strncpy(corp->name, name, name_len - 1);
corp->next = NULL;
corp->length = fsize;
corp->exclusion_factor= 0;
corp->excluded = false;
// if the corpus is empty, this is the first one
if(fstate->corpus == NULL) {
fstate->corpus = corp;
}
if (fstate->last_corpus != NULL) {
fstate->last_corpus->next = corp;
fstate->last_corpus = corp;
} else {
fstate->last_corpus = corp;
}
fstate->corpus_count++;
}
void stdln_load_corpus(fuzzer_state_t *fstate) {
struct dirent *dir = NULL;
DIR *corpus_dir = opendir(fstate->config->corpus_dir);
if (!corpus_dir) {
plog("[!] Error. Cannot open corpus directory at %s\n", fstate->config->corpus_dir);
do_exit(fstate);
}
// Add each file in the corpus directory to corpus list
while ((dir = readdir(corpus_dir)) != NULL) {
if (strcmp(dir->d_name, ".") == 0 || strcmp(dir->d_name, "..") == 0 || strcmp(dir->d_name, ".cur_input") == 0) {
continue;
}
if (fstate->config->verbose) {
plog("[*] Found corpus file %s\n", dir->d_name);
}
char filename[0x200];
snprintf(filename, 0x200, "%s/%s", fstate->config->corpus_dir, dir->d_name);
FILE *f = fopen(filename, "rb");
if (f == NULL) {
plog("[!] Error opening corpus file %s\n", filename);
continue;
}
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
rewind(f);
uint8_t *content = malloc(fsize);
size_t len = fread(content, 1, fsize, f);
if (len < 0) {
plog("[!] Error reading from corpus file %s (%s)\n", filename, strerror(errno));
continue;
}
fclose(f);
stdln_add_corpus_entry(fstate, content, fsize, dir->d_name);
}
closedir(corpus_dir);
}
void stdln_store_crash(fuzzer_state_t *fstate, corpus_entry_t *corp) {
char filename[0x200];
if (corp == NULL) {
return;
}
sprintf(filename, "%s/crash-%s", fstate->config->out_dir, corp->name);
FILE *f = fopen(filename, "wb");
if (f == NULL) {
plog("[!] Error opening crash file %s (%s)\n", filename, strerror(errno));
}
// TODO: store error message
// TODO: store coverage if possible
fwrite("Payload:\n", strlen("Payload:\n"), 1, f);
fwrite(corp->data, corp->length, 1, f);
fclose(f);
}
coverage_t *stdln_wait_for_coverage(fuzzer_state_t *fstate, corpus_entry_t *corp) {
coverage_t *retcov = NULL;
// when our target crashes we (currently) do not get coverage information but
// we can store information related to the crash
if (fstate->exec_ret_status != 0) {
// TODO: filter crashing inputs
stdln_store_crash(fstate, corp);
fstate->exec_ret_status = 0;
} else {
if (fstate->config->communication_mode == COMMUNICATION_MODE_SHM) {
JsonParser *parser = json_parser_new();
JsonNode *root = NULL;
JsonArray *ar = NULL;
// in the SHM case the coverage JSON string is supplied in the SHM
// position where the payload was before
char *json_string = fstate->commap->payload;
json_parser_load_from_data(parser, json_string, fstate->commap->payload_len, NULL);
root = json_parser_get_root(parser);
if (root == NULL) {
return (coverage_t *) NULL;
}
ar = json_node_get_array(json_parser_get_root(parser));
if (ar == NULL) {
return (coverage_t *) NULL;
}
retcov = stdln_parse_coverage_from_json(ar);
g_object_unref(parser);
} else {
retcov = fstate->last_coverage;
fstate->last_coverage = NULL;
}
}
return retcov;
}
coverage_t *stdln_fuzz_payload(fuzzer_state_t *fstate, corpus_entry_t *corp) {
if (fstate->config->input_mode == INPUT_MODE_CMD) {
FILE *f = fopen(fstate->cur_input_file, "wb");
fwrite(corp->data, corp->length, 1, f);
fclose(f);
}
do_fuzz_iteration(fstate, corp->data, corp->length);
return stdln_wait_for_coverage(fstate, corp);
}
coverage_t *stdln_passive_fuzz(fuzzer_state_t *fstate, corpus_entry_t **retcorp) {
// it's fine if passive_corp is NULL, stdln_wait_for_coverage can handle that
corpus_entry_t *corp = NULL;
do_fuzz_iteration(fstate, NULL, 0);
corp = fstate->passive_corp;
*retcorp = corp;
fstate->passive_corp = NULL;
return stdln_wait_for_coverage(fstate, corp);
}
bool stdln_is_bb_in_fuzzer_coverage(fuzzer_state_t *fstate, basic_block_t *bb) {
for (int i = 0; i < fstate->coverage.basic_block_count; i++) {
basic_block_t *cur_bb = &fstate->coverage.basic_blocks[i];
if (bb->start == cur_bb->start && bb->end == cur_bb->end) {
return true;
}
}
return false;
}
bool stdln_is_bb_in_module(fuzzer_state_t *fstate, basic_block_t *bb) {
module_t *cur_mod = fstate->modules;
while (cur_mod != NULL) {
if (bb->start >= cur_mod->start && bb->end <= cur_mod->end) {
return true;
}
cur_mod = cur_mod->next;
}
return false;
}
void stdln_add_coverage_to_state(fuzzer_state_t *fstate, coverage_t *cov) {
// if our coverage is still empty, just add all
if (fstate->coverage.basic_block_count == 0) {
for (int i = 0; i < cov->basic_block_count; i++) {
fstate->coverage.basic_blocks[fstate->coverage.basic_block_count].start =
cov->basic_blocks[i].start;
fstate->coverage.basic_blocks[fstate->coverage.basic_block_count].end =
cov->basic_blocks[i].end;
fstate->coverage.basic_block_count++;
}
return;
}
// for each entry in this coverage we check if it is not yet in the fuzzer's
// accumulated coverage, TODO: make this more clever/better performing if required
for (int i = 0; i < cov->basic_block_count; i++) {
if (!stdln_is_bb_in_module(fstate, &cov->basic_blocks[i]) || stdln_is_bb_in_fuzzer_coverage(fstate, &cov->basic_blocks[i])) {
} else {
fstate->coverage.basic_blocks[fstate->coverage.basic_block_count].start =
cov->basic_blocks[i].start;
fstate->coverage.basic_blocks[fstate->coverage.basic_block_count].end =
cov->basic_blocks[i].end;
fstate->coverage.basic_block_count++;
}
}
}
void stdln_write_coverage_to_disk(fuzzer_state_t *fstate, char *name, coverage_t *cov) {
// implemented as documented by https://www.ayrx.me/drcov-file-format
size_t filename_len = strlen(fstate->config->out_dir) + strlen(name) + 32;
char *cov_filename = malloc(filename_len);
bzero(cov_filename, filename_len);
snprintf(cov_filename, filename_len, "%s/cov-%s-%ld", fstate->config->out_dir, name, time(NULL));
char row[256];
FILE *f = fopen(cov_filename, "wb");
fwrite(DRCOV_HEADER, strlen(DRCOV_HEADER), 1, f);
// we only prepare the drcov module list once and save it for later
if (fstate->drcov_modules_str == NULL) {
uint32_t module_count = 0;
module_t *m = fstate->modules;
while (m != NULL) {
module_count++;
m = m->next;
}
// allocate 256 bytes per row (+ header) in the module table, should be
// enough even for the long module names that Apple sometimes has...
fstate->drcov_modules_str = malloc(256 * (module_count + 1));
bzero(fstate->drcov_modules_str, 256 * module_count);
// write module table header
snprintf(fstate->drcov_modules_str, 256, DRCOV_MODULE_TABLE_HEAD, module_count);
// assemble drcov module list entries and leave entry, checksum and timestamp empty
m = fstate->modules;
uint32_t idx = 0;
while(m != NULL) {
bzero(row, 256);
snprintf(row, 256, "%d, 0x%llx, 0x%llx, 0x0000000000000000, 0x00000000, 0x00000000, %s\n", idx, m->start, m->end, m->name);
strncat(fstate->drcov_modules_str, row, 256);
m = m->next;
}
}
fwrite(fstate->drcov_modules_str, strlen(fstate->drcov_modules_str), 1, f);
bzero(row, 256);
snprintf(row, 256, "BB Table: %zu bbs\n", cov->basic_block_count);
fwrite(row, strlen(row), 1, f);
// convert our internal bb coverage representation to drcov format
for (int i = 0; i < cov->basic_block_count; i++) {
basic_block_t cur_bb = cov->basic_blocks[i];
bb_entry_t bb;
// check which module the BB belongs to
uint32_t module_id = 0;
bool found_module = false;
module_t *m = fstate->modules;
while (m != NULL) {
if (cur_bb.start >= m->start && cur_bb.end <= m->end) {
found_module = true;
break;
}
module_id++;
m = m->next;
}
// leave out BBs that do not belog to any of the known modules
if (!found_module) {
continue;
}
bb.start = (uint32_t) cur_bb.start - m->start;
bb.size = (uint16_t) (cur_bb.end- cur_bb.start);
bb.mod_id = module_id;
fwrite((void *)&bb, sizeof(bb), 1, f);
}
if (fstate->config->verbose) {
plog("[*] Wrote coverage to %s\n", cov_filename);
}
free(cov_filename);
fclose(f);
}
void stdln_get_corpus_coverage(fuzzer_state_t *fstate) {
corpus_entry_t *corp = fstate->corpus;
// iterate over each file in corpus collection and store the resulting coverage
while(corp != NULL) {
plog("[*] Getting corpus coverage (%s)\n", corp->name);
// TODO: maybe repeat this to catch coverage differents between runs for the
// same input and notify the user about instability
coverage_t *cur_cov = stdln_fuzz_payload(fstate, corp);
// TODO: handle coverage_bitmap case
if (cur_cov == NULL) {
plog("[!] Error getting coverage for payload %s (probably due to crash)\n", corp->name);
} else if ((void *)cur_cov == (void *)0x01) {
plog("[!] RETRYING getting coverage for payload %s\n", corp->name);
} else {
// add the newly gathered coverage to the fuzzing state's coverage collection
stdln_add_coverage_to_state(fstate, cur_cov);
// store coverage information on disk as DRCOV file
stdln_write_coverage_to_disk(fstate, corp->name, cur_cov);
}
corp = corp->next;
}
plog("[*] Using %lu input files covering a total of %lu basic blocks\n",
fstate->corpus_count, fstate->coverage.basic_block_count);
}
size_t _mutate_custom_cmd(char *cmd, corpus_entry_t *in, char *out, size_t outsize) {
size_t len = 0;
int in_pipe[2];
int out_pipe[2];
int s = pipe(in_pipe);
if (s < 0) {
plog("[!] Error creating in_pipe in %s (%s)\n", __func__, strerror(errno));
return len;
}
s = pipe(out_pipe);
if (s < 0) {
plog("[!] Error creating out_pipe in %s (%s)\n", __func__, strerror(errno));
return len;
}
pid_t p = fork();
if (p < 0) {
plog("[!] Unable to fork in %s. Error: %s\n", __func__, strerror(errno));
return len;
}
if (p == 0) {
close(in_pipe[1]);
dup2(in_pipe[0], 0);
close(out_pipe[0]);
dup2(out_pipe[1], 1);
execl("/bin/sh", "sh", "-c", cmd, NULL);
exit(1);
}
close(in_pipe[0]);
close(out_pipe[1]);
// write cmd to child process
len = write(in_pipe[1], in->data, in->length);
if (write < 0) {
plog("[!] Unable to write to child process in %s (%s)\n", __func__, strerror(errno));
return len;
}
close(in_pipe[1]);
// read output
len = read(out_pipe[0], out, outsize);
close(out_pipe[0]);
// kill child
kill(p, SIGKILL);
waitpid(0, NULL, WNOHANG);
return len;
}
corpus_entry_t *stdln_mutate_corpus_entry(fuzzer_state_t *fstate, corpus_entry_t *incorp, uint64_t seed) {
corpus_entry_t *newcorp = malloc(sizeof(corpus_entry_t));
newcorp->length = incorp->length;
if (fstate->config->standalone_mutator == STANDALONE_MUTATOR_RAND) {
newcorp->data = malloc(newcorp->length);
memcpy(newcorp->data, incorp->data, newcorp->length);
int count = rand() % 12;
for (int i = 0; i < count; i++) {
uint64_t pos = rand() % newcorp->length;
uint8_t val = rand() % 0xff;
if (pos < newcorp->length)
newcorp->data[pos] = val;
else
plog("[*] Mutation weirdness: pos: %llu, newcorp->lengh: %zu\n", pos, newcorp->length);
}
size_t namelen = strlen(incorp->name) + 32;
newcorp->name = malloc(namelen);
bzero(newcorp->name, namelen);
sprintf(newcorp->name, "%s_%llu-%d", incorp->name, seed, count);
} else if (fstate->config->standalone_mutator == STANDALONE_MUTATOR_CUSTOM) {
size_t payload_len = _mutate_custom_cmd(fstate->config->custom_mutator_cmd, incorp,
fstate->custom_mutator_buf, fstate->custom_mutator_bufsize);
newcorp->data = malloc(payload_len);
bzero(newcorp->data, payload_len);
newcorp->length = payload_len;
memcpy(newcorp->data, fstate->custom_mutator_buf, payload_len);
bzero(fstate->custom_mutator_buf, fstate->custom_mutator_bufsize);
size_t namelen = 128;
newcorp->name = malloc(namelen);
bzero(newcorp->name, namelen);
sprintf(newcorp->name, "%llu_%ld", seed, time(NULL));
} else { // STANDALONE_MUTATOR_NULL
newcorp->length = incorp->length;
newcorp->data = malloc(newcorp->length);
memcpy(newcorp->data, incorp->data, newcorp->length);
size_t namelen = strlen(incorp->name) + 1;
newcorp->name = malloc(namelen);
strncpy(newcorp->name, incorp->name, namelen);
}
return newcorp;
}
void stdln_add_entry_to_corpus(fuzzer_state_t *fstate, corpus_entry_t *newcorp) {
char filename[0x200];
snprintf(filename, 0x200, "%s/%s", fstate->config->corpus_dir, newcorp->name);
FILE *f = fopen(filename, "wb");
fwrite(newcorp->data, 1, newcorp->length, f);
fclose(f);
plog("[*] Added new file %s to corpus\n", newcorp->name);
stdln_add_corpus_entry(fstate, newcorp->data, newcorp->length, newcorp->name);
}
bool stdln_is_coverage_new(fuzzer_state_t *fstate, coverage_t *cov) {
// right now we just run over our complete coverage and as soon as we see that the
// new coverage contains a start-end combination that we don't know yet we consider this
// a new coverage
for(int i = 0; i < cov->basic_block_count; i++) {
if (!stdln_is_bb_in_module(fstate, &cov->basic_blocks[i])) {
continue;
}
bool did_find_bb_in_state = false;
for(int j = 0; j < fstate->coverage.basic_block_count; j++) {
if ((cov->basic_blocks[i].start == fstate->coverage.basic_blocks[j].start) &&
(cov->basic_blocks[i].end == fstate->coverage.basic_blocks[j].end)) {
did_find_bb_in_state = true;
}
}
if (!did_find_bb_in_state) {
return true;
}
}
return false;
}
void stdln_fuzz_loop(fuzzer_state_t *fstate) {
gettimeofday(&fstate->t_total_time, NULL);
while(true) {
uint64_t seed = fstate->config->seed;
srand(seed);
corpus_entry_t *corp = fstate->corpus;
size_t payload_count = 0;
struct timeval *cur_loop_timer = _start_measure();
while (corp != NULL) {
struct timeval *mut_timer = _start_measure();
corpus_entry_t *mutated_payload = stdln_mutate_corpus_entry(fstate, corp, seed);
fstate->mutation_time += _stop_measure(mut_timer);
fstate->mutation_count++;
coverage_t *cur_cov = stdln_fuzz_payload(fstate, mutated_payload);
if (cur_cov == NULL) {
plog("[!] Error getting coverage for mutated corpus %s\n", corp->name);
} else {
// check if this is new coverage we didn't see before
if (stdln_is_coverage_new(fstate, cur_cov)) {
plog("[!] New coverage found, nice!\n");
// add the new coverage to the fuzzing state's coverage collection
stdln_add_coverage_to_state(fstate, cur_cov);
// store the coverage information on disk as DRCOV file
stdln_write_coverage_to_disk(fstate, corp->name, cur_cov);
// add the mutated file to corpus
stdln_add_entry_to_corpus(fstate, mutated_payload);
}
}
free_corpus(mutated_payload);
free_cov(cur_cov);
corp = corp->next;
payload_count++;
}
fstate->total_payload_count += payload_count;
struct timeval t_elapsed, t_now;
gettimeofday(&t_now, NULL);
timersub(&t_now, &fstate->t_total_time, &t_elapsed);
int fcps = fstate->total_payload_count / (t_elapsed.tv_sec != 0 ? t_elapsed.tv_sec : 1);
int mut_avg = fstate->mutation_time / fstate->total_payload_count;
int cov_avg = fstate->coverage_time / fstate->total_payload_count;
uint64_t cur_loop_time = _stop_measure(cur_loop_timer);
plog("[t=%lu] [BBs=%zu] [seed=%llu] [fc=%llu] [fcps=%d] [cur_loop=%llu] [mut_avg=%d] "
"[cov_avg=%d] [corpus=%zu]\n",
time(NULL), fstate->coverage.basic_block_count, seed, fstate->total_payload_count,
fcps, cur_loop_time, mut_avg, cov_avg, fstate->corpus_count);
fstate->config->seed = seed + 1;
}
}
void stdln_passive_loop(fuzzer_state_t *fstate) {
gettimeofday(&fstate->t_total_time, NULL);
while(true) {
struct timeval *cur_loop_timer = _start_measure();
corpus_entry_t *retcorp = NULL;
coverage_t *cur_cov = stdln_passive_fuzz(fstate, &retcorp);
if (cur_cov == NULL) {
plog("[!] No coverage returned for this execution.\n");
} else {
// check if this is new coverage we didn't see before
if (stdln_is_coverage_new(fstate, cur_cov)) {
plog("[!] New coverage found, nice!\n");
// add the new coverage to the fuzzing state's coverage collection
stdln_add_coverage_to_state(fstate, cur_cov);
// store the coverage information on disk as DRCOV file
stdln_write_coverage_to_disk(fstate, "PASSIVE", cur_cov);
// TODO: give the user the possibility to store EACH payload?
if (retcorp != NULL) {
stdln_add_entry_to_corpus(fstate, retcorp);
}
}
}
fstate->total_payload_count += 1;
free_cov(cur_cov);
struct timeval t_elapsed, t_now;
gettimeofday(&t_now, NULL);
timersub(&t_now, &fstate->t_total_time, &t_elapsed);
int fcps = fstate->total_payload_count / (t_elapsed.tv_sec != 0 ? t_elapsed.tv_sec : 1);
int cov_avg = fstate->coverage_time / fstate->total_payload_count;
uint64_t cur_loop_time = _stop_measure(cur_loop_timer);
plog("[t=%lu] [BBs=%zu] [fc=%llu] [fcps=%d] [cur_loop=%llu] [cov_avg=%d]\n",
time(NULL), fstate->coverage.basic_block_count, fstate->total_payload_count,
fcps, cur_loop_time, cov_avg);
}
}
// taken from https://gist.github.com/bg5sbk/11058000
char* str_replace(char* string, const char* substr, const char* replacement) {
char* tok = NULL;
char* newstr = NULL;
char* oldstr = NULL;
int oldstr_len = 0;
int substr_len = 0;
int replacement_len = 0;
newstr = strdup(string);
substr_len = strlen(substr);
replacement_len = strlen(replacement);
if (substr == NULL || replacement == NULL) {
return newstr;
}
while ((tok = strstr(newstr, substr))) {
oldstr = newstr;
oldstr_len = strlen(oldstr);
newstr = (char*)malloc(sizeof(char) * (oldstr_len - substr_len + replacement_len + 1));
if (newstr == NULL) {
free(oldstr);
return NULL;
}
memcpy(newstr, oldstr, tok - oldstr);
memcpy(newstr + (tok - oldstr), replacement, replacement_len);
memcpy(newstr + (tok - oldstr) + replacement_len, tok + substr_len, oldstr_len - substr_len - (tok - oldstr));
memset(newstr + oldstr_len - substr_len + replacement_len, 0, 1);
free(oldstr);
}
return newstr;
}
void run_standalone_active(fuzzer_state_t *fstate) {
stdln_init(fstate);
// Wait until the harness signals that it's ready
while (!fstate->is_ready) {
usleep(5000);
}
plog("[*] Fuzzer is ready.\n");
if (fstate->config->input_mode == INPUT_MODE_CMD) {
// store filename of .cur_input file for cmd input mode
fstate->cur_input_file = malloc(0x100);
snprintf(fstate->cur_input_file, 0x100, "%s/.cur_input", fstate->config->corpus_dir);
// replace @@ in command string with .cur_input filename
char *new_command = str_replace(fstate->config->command, "@@", fstate->cur_input_file);
free(fstate->config->command);
fstate->config->command = new_command;
}
stdln_load_corpus(fstate);
stdln_get_corpus_coverage(fstate);
stdln_fuzz_loop(fstate);
}
void run_standalone_passive(fuzzer_state_t *fstate) {
stdln_init(fstate);
// Wait until the harness signals that it's ready
while (!fstate->is_ready) {
usleep(5000);
}
stdln_passive_loop(fstate);
}