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//===-- klee_init_env.c ---------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/klee.h"
#define _LARGEFILE64_SOURCE
#include "fd.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/syscall.h>
#include <unistd.h>
static void __emit_error(const char *msg) {
klee_report_error(__FILE__, __LINE__, msg, "user.err");
}
/* Helper function that converts a string to an integer, and
terminates the program with an error message is the string is not a
proper number */
static long int __str_to_int(char *s, const char *error_msg) {
long int res = 0;
char c;
if (!*s) __emit_error(error_msg);
while ((c = *s++)) {
if (c == '\0') {
break;
} else if (c>='0' && c<='9') {
res = res*10 + (c - '0');
} else {
__emit_error(error_msg);
}
}
return res;
}
static int __isprint(const char c) {
/* Assume ASCII */
return (32 <= c && c <= 126);
}
static int __streq(const char *a, const char *b) {
while (*a == *b) {
if (!*a)
return 1;
a++;
b++;
}
return 0;
}
static char *__get_sym_str(int numChars, char *name) {
int i;
char *s = malloc(numChars+1);
klee_mark_global(s);
klee_make_symbolic(s, numChars+1, name);
for (i=0; i<numChars; i++)
klee_prefer_cex(s, __isprint(s[i]));
s[numChars] = '\0';
return s;
}
static void __add_arg(int *argc, char **argv, char *arg, int argcMax) {
if (*argc==argcMax) {
__emit_error("too many arguments for klee_init_env");
} else {
argv[*argc] = arg;
(*argc)++;
}
}
void klee_init_env(int* argcPtr, char*** argvPtr) {
int argc = *argcPtr;
char** argv = *argvPtr;
int new_argc = 0, n_args;
char* new_argv[1024];
unsigned max_len, min_argvs, max_argvs;
unsigned sym_files = 0, sym_file_len = 0;
int sym_stdout_flag = 0;
int save_all_writes_flag = 0;
int fd_fail = 0;
char** final_argv;
char sym_arg_name[5] = "arg";
unsigned sym_arg_num = 0;
int k=0, i;
sym_arg_name[4] = '\0';
// Recognize --help when it is the sole argument.
if (argc == 2 && __streq(argv[1], "--help")) {
__emit_error("klee_init_env\n\n\
usage: (klee_init_env) [options] [program arguments]\n\
-sym-arg <N> - Replace by a symbolic argument with length N\n\
-sym-args <MIN> <MAX> <N> - Replace by at least MIN arguments and at most\n\
MAX arguments, each with maximum length N\n\
-sym-files <NUM> <N> - Make stdin and up to NUM symbolic files, each\n\
with maximum size N.\n\
-sym-stdout - Make stdout symbolic.\n\
-max-fail <N> - Allow up to <N> injected failures\n\
-fd-fail - Shortcut for '-max-fail 1'\n\n");
}
while (k < argc) {
if (__streq(argv[k], "--sym-arg") || __streq(argv[k], "-sym-arg")) {
const char *msg = "--sym-arg expects an integer argument <max-len>";
if (++k == argc)
__emit_error(msg);
max_len = __str_to_int(argv[k++], msg);
sym_arg_name[3] = '0' + sym_arg_num++;
__add_arg(&new_argc, new_argv,
__get_sym_str(max_len, sym_arg_name),
1024);
}
else if (__streq(argv[k], "--sym-args") || __streq(argv[k], "-sym-args")) {
const char *msg =
"--sym-args expects three integer arguments <min-argvs> <max-argvs> <max-len>";
if (k+3 >= argc)
__emit_error(msg);
k++;
min_argvs = __str_to_int(argv[k++], msg);
max_argvs = __str_to_int(argv[k++], msg);
max_len = __str_to_int(argv[k++], msg);
n_args = klee_range(min_argvs, max_argvs+1, "n_args");
for (i=0; i < n_args; i++) {
sym_arg_name[3] = '0' + sym_arg_num++;
__add_arg(&new_argc, new_argv,
__get_sym_str(max_len, sym_arg_name),
1024);
}
}
else if (__streq(argv[k], "--sym-files") || __streq(argv[k], "-sym-files")) {
const char* msg = "--sym-files expects two integer arguments <no-sym-files> <sym-file-len>";
if (k+2 >= argc)
__emit_error(msg);
k++;
sym_files = __str_to_int(argv[k++], msg);
sym_file_len = __str_to_int(argv[k++], msg);
}
else if (__streq(argv[k], "--sym-stdout") || __streq(argv[k], "-sym-stdout")) {
sym_stdout_flag = 1;
k++;
}
else if (__streq(argv[k], "--save-all-writes") || __streq(argv[k], "-save-all-writes")) {
save_all_writes_flag = 1;
k++;
}
else if (__streq(argv[k], "--fd-fail") || __streq(argv[k], "-fd-fail")) {
fd_fail = 1;
k++;
}
else if (__streq(argv[k], "--max-fail") || __streq(argv[k], "-max-fail")) {
const char *msg = "--max-fail expects an integer argument <max-failures>";
if (++k == argc)
__emit_error(msg);
fd_fail = __str_to_int(argv[k++], msg);
}
else {
/* simply copy arguments */
__add_arg(&new_argc, new_argv, argv[k++], 1024);
}
}
final_argv = (char**) malloc((new_argc+1) * sizeof(*final_argv));
klee_mark_global(final_argv);
memcpy(final_argv, new_argv, new_argc * sizeof(*final_argv));
final_argv[new_argc] = 0;
*argcPtr = new_argc;
*argvPtr = final_argv;
klee_init_fds(sym_files, sym_file_len,
sym_stdout_flag, save_all_writes_flag,
fd_fail);
}
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