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pipe.c
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pipe.c
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/*
Cuckoo Sandbox - Automated Malware Analysis
Copyright (C) 2010-2015 Cuckoo Sandbox Developers, Optiv, Inc. ([email protected])
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include "ntapi.h"
#include "hooking.h"
#include "pipe.h"
#include "utf8.h"
#include "misc.h"
#include "config.h"
#include "log.h"
static int _pipe_utf8x(char **out, unsigned short x)
{
unsigned char buf[3];
int len = utf8_encode(x, buf);
if(*out != NULL) {
memcpy(*out, buf, len);
*out += len;
}
return len;
}
static int _pipe_ascii(char **out, const char *s, int len)
{
int ret = 0;
while (len-- != 0) {
ret += _pipe_utf8x(out, *(unsigned char *) s++);
}
return ret;
}
static int _pipe_unicode(char **out, const wchar_t *s, int len)
{
int ret = 0;
while (len-- != 0) {
ret += _pipe_utf8x(out, *(unsigned short *) s++);
}
return ret;
}
static int _pipe_sprintf(char *out, const char *fmt, va_list args)
{
int ret = 0;
while (*fmt != 0) {
if(*fmt != '%') {
ret += _pipe_utf8x(&out, *fmt++);
continue;
}
if(*++fmt == 'z') {
const char *s = va_arg(args, const char *);
if(s == NULL) return -1;
ret += _pipe_ascii(&out, s, (int)strlen(s));
}
else if (*fmt == 'c') {
char buf[2];
buf[0] = va_arg(args, char);
buf[1] = '\0';
ret += _pipe_ascii(&out, buf, 1);
}
else if(*fmt == 'Z') {
const wchar_t *s = va_arg(args, const wchar_t *);
if(s == NULL) return -1;
ret += _pipe_unicode(&out, s, lstrlenW(s));
}
else if (*fmt == 'F') {
const wchar_t *s = va_arg(args, const wchar_t *);
wchar_t *absolutepath = malloc(32768 * sizeof(wchar_t));
if (s == NULL) return -1;
if (absolutepath) {
ensure_absolute_unicode_path(absolutepath, s);
ret += _pipe_unicode(&out, absolutepath, lstrlenW(absolutepath));
free(absolutepath);
}
else {
return -1;
}
}
else if (*fmt == 's') {
int len = va_arg(args, int);
const char *s = va_arg(args, const char *);
if(s == NULL) return -1;
ret += _pipe_ascii(&out, s, len < 0 ? (int)strlen(s) : len);
}
else if(*fmt == 'S') {
int len = va_arg(args, int);
const wchar_t *s = va_arg(args, const wchar_t *);
if(s == NULL) return -1;
ret += _pipe_unicode(&out, s, len < 0 ? lstrlenW(s) : len);
}
else if(*fmt == 'o') {
UNICODE_STRING *str = va_arg(args, UNICODE_STRING *);
if(str == NULL) return -1;
ret += _pipe_unicode(&out, str->Buffer,
str->Length / sizeof(wchar_t));
}
else if(*fmt == 'O') {
OBJECT_ATTRIBUTES *obj = va_arg(args, OBJECT_ATTRIBUTES *);
wchar_t path[MAX_PATH_PLUS_TOLERANCE];
wchar_t *absolutepath;
if(obj == NULL || obj->ObjectName == NULL) return -1;
absolutepath = malloc(32768 * sizeof(wchar_t));
if (absolutepath) {
path_from_object_attributes(obj, path, (unsigned int)MAX_PATH_PLUS_TOLERANCE);
ensure_absolute_unicode_path(absolutepath, path);
ret += _pipe_unicode(&out, absolutepath, lstrlenW(absolutepath));
free(absolutepath);
}
else {
ret += _pipe_unicode(&out, L"", 0);
}
}
else if(*fmt == 'd') {
char s[32];
num_to_string(s, sizeof(s), va_arg(args, int));
ret += _pipe_ascii(&out, s, (int)strlen(s));
}
else if(*fmt == 'x') {
char s[16];
sprintf(s, "%x", va_arg(args, int));
ret += _pipe_ascii(&out, s, (int)strlen(s));
}
else if (*fmt == 'p') {
char s[18];
sprintf(s, "%p", va_arg(args, void *));
ret += _pipe_ascii(&out, s, (int)strlen(s));
}
else {
const char *msg = "-- UNKNOWN FORMAT STRING -- ";
ret += _pipe_ascii(&out, msg, (int)strlen(msg));
}
fmt++;
}
return ret;
}
// reminder: %s doesn't follow sprintf semantics, use %z instead
int pipe(const char *fmt, ...)
{
va_list args;
int len;
int ret = -1;
lasterror_t lasterror;
va_start(args, fmt);
get_lasterrors(&lasterror);
log_flush();
len = _pipe_sprintf(NULL, fmt, args);
if (len > 0) {
char *buf = calloc(1, len + 1);
_pipe_sprintf(buf, fmt, args);
#ifdef CUCKOODBG
char filename[64];
snprintf(filename, sizeof(filename), "c:\\pipe%u.log", GetCurrentProcessId());
FILE *f = fopen(filename, "ab");
if (f) {
fwrite(buf, len, 1, f);
fclose(f);
ret = 0;
}
#else
if (CallNamedPipeW(g_config.pipe_name, buf, len, buf, len,
(unsigned long *)&len, NMPWAIT_WAIT_FOREVER) != 0)
ret = 0;
#endif
free(buf);
}
va_end(args);
set_lasterrors(&lasterror);
return ret;
}
int pipe2(void *out, int *outlen, const char *fmt, ...)
{
va_list args;
int len;
int ret = -1;
va_start(args, fmt);
len = _pipe_sprintf(NULL, fmt, args);
if(len > 0) {
char *buf = calloc(1, len + 1);
_pipe_sprintf(buf, fmt, args);
va_end(args);
if(CallNamedPipeW(g_config.pipe_name, buf, len, out, *outlen,
(DWORD *) outlen, NMPWAIT_WAIT_FOREVER) != 0)
ret = 0;
free(buf);
}
return ret;
}