File: value.c

package info (click to toggle)
scanmem 0.16-1
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 948 kB
  • ctags: 580
  • sloc: ansic: 4,266; python: 1,551; xml: 1,042; sh: 160; makefile: 84
file content (281 lines) | stat: -rw-r--r-- 11,035 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
    Simple routines for working with the value_t data structure.

    Copyright (C) 2006,2007,2009 Tavis Ormandy <taviso@sdf.lonestar.org>
    Copyright (C) 2009           Eli Dupree <elidupree@charter.net>
    Copyright (C) 2009,2010      WANG Lu <coolwanglu@gmail.com>
    Copyright (C) 2015           Sebastian Parschauer <s.parschauer@gmx.de>

    This file is part of libscanmem.

    This library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This library 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this library.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "config.h"

#include <config.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <limits.h>
#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>

#include "value.h"
#include "scanroutines.h"
#include "scanmem.h"

void valtostr(const value_t *val, char *str, size_t n)
{
    char buf[128];
    int np = 0;
    int max_bytes = 0;
    bool print_as_unsigned = false;

#define FLAG_MACRO(bytes, string) (val->flags.u##bytes##b && val->flags.s##bytes##b) ? (string " ") : (val->flags.u##bytes##b) ? (string "u ") : (val->flags.s##bytes##b) ? (string "s ") : ""
    
    /* set the flags */
    np = snprintf(buf, sizeof(buf), "[%s%s%s%s%s%s%s]",
         FLAG_MACRO(64, "I64"),
         FLAG_MACRO(32, "I32"),
         FLAG_MACRO(16, "I16"),
         FLAG_MACRO(8,  "I8"),
         val->flags.f64b ? "F64 " : "",
         val->flags.f32b ? "F32 " : "",
         (val->flags.ineq_reverse && !val->flags.ineq_forwards) ? "(reversed inequality) " : "");
    /* handle having no type at all */
    if (np <= 2)
        goto err;

         if (val->flags.u64b) { max_bytes = 8; print_as_unsigned =  true; }
    else if (val->flags.s64b) { max_bytes = 8; print_as_unsigned = false; }
    else if (val->flags.u32b) { max_bytes = 4; print_as_unsigned =  true; }
    else if (val->flags.s32b) { max_bytes = 4; print_as_unsigned = false; }
    else if (val->flags.u16b) { max_bytes = 2; print_as_unsigned =  true; }
    else if (val->flags.s16b) { max_bytes = 2; print_as_unsigned = false; }
    else if (val->flags.u8b ) { max_bytes = 1; print_as_unsigned =  true; }
    else if (val->flags.s8b ) { max_bytes = 1; print_as_unsigned = false; }

    /* find the right format, considering different integer size implementations */
         if (max_bytes == sizeof(long long)) np = snprintf(str, n, print_as_unsigned ? "%llu, %s" : "%lld, %s", print_as_unsigned ? get_ulonglong(val) : get_slonglong(val), buf);
    else if (max_bytes == sizeof(long))      np = snprintf(str, n, print_as_unsigned ? "%lu, %s"  : "%ld, %s" , print_as_unsigned ? get_ulong(val) : get_slong(val), buf);
    else if (max_bytes == sizeof(int))       np = snprintf(str, n, print_as_unsigned ? "%u, %s"   : "%d, %s"  , print_as_unsigned ? get_uint(val) : get_sint(val), buf);
    else if (max_bytes == sizeof(short))     np = snprintf(str, n, print_as_unsigned ? "%hu, %s"  : "%hd, %s" , print_as_unsigned ? get_ushort(val) : get_sshort(val), buf);
    else if (max_bytes == sizeof(char))      np = snprintf(str, n, print_as_unsigned ? "%hhu, %s" : "%hhd, %s", print_as_unsigned ? get_uchar(val) : get_schar(val), buf);
    else if (val->flags.f64b) np = snprintf(str, n, "%lf, %s", get_f64b(val), buf);
    else if (val->flags.f32b) np = snprintf(str, n, "%f, %s", get_f32b(val), buf);
    else
        goto err;
    if (np <= 0 || np >= (n - 1))
        goto err;

    return;
err:
    /* always print a value and a type for not crashing the GUI */
    strncpy(str, "unknown, [unknown]", n);
}

void valcpy(value_t * dst, const value_t * src)
{
    memcpy(dst, src, sizeof(value_t));
    return;
}

/* dst.flags must be set beforehand */
void uservalue2value(value_t *dst, const uservalue_t *src)
{
    if(dst->flags.u8b) set_u8b(dst, get_u8b(src));
    if(dst->flags.s8b) set_s8b(dst, get_s8b(src));
    if(dst->flags.u16b) set_u16b(dst, get_u16b(src));
    if(dst->flags.s16b) set_s16b(dst, get_s16b(src));
    if(dst->flags.u32b) set_u32b(dst, get_u32b(src));
    if(dst->flags.s32b) set_s32b(dst, get_s32b(src));
    if(dst->flags.u64b) set_u64b(dst, get_u64b(src));
    if(dst->flags.s64b) set_s64b(dst, get_s64b(src));
    /* I guess integer and float cannot be matched together */
    if(dst->flags.f32b) set_f32b(dst, get_f32b(src));
    if(dst->flags.f64b) set_f64b(dst, get_f64b(src));
}

/* array must have been allocated, of size at least argc */
bool parse_uservalue_bytearray(char **argv, unsigned argc, bytearray_element_t *array, uservalue_t *val)
{
    int i,j;

    const char *cur_str;
    char cur_char;
    char *endptr;
    bytearray_element_t *cur_element;

    for(i = 0; i < argc; ++i)
    {
        /* get current string */
        cur_str = argv[i];
        /* test its length */
        for(j = 0; (j < 3) && (cur_str[j]); ++j) {}
        if (j != 2) /* length is not 2 */
            return false;

        cur_element = array + i;
        if (strcmp(cur_str, "??") == 0)
        {
            cur_element->is_wildcard = 1;
            continue;
        }
        else
        {
            /* parse as hex integer */
            cur_char = (char)strtol(cur_str, &endptr, 16);
            if (*endptr != '\0')
                return false;

            cur_element->is_wildcard = 0;
            cur_element->byte = cur_char;
        }
    }

    /* everything is ok */
    val->bytearray_value = array;
    val->flags.bytearray_length = argc;
    return true;
}

bool parse_uservalue_number(const char *nptr, uservalue_t * val)
{
    /* TODO multiple rounding method */
    if (parse_uservalue_int(nptr, val))
    {
        val->flags.f32b = val->flags.f64b = 1;
        val->float32_value = (float) val->int64_value;
        val->float64_value = (double) val->int64_value;   
        return true;
    }
    else if(parse_uservalue_float(nptr, val))
    {
        double num = val->float64_value;
        if (num >=        (double)(0) && num < (double)(1LL<< 8)) { val->flags.u8b  = 1; set_u8b(val, (uint8_t)num); }
        if (num >= (double)-(1LL<< 7) && num < (double)(1LL<< 7)) { val->flags.s8b  = 1; set_s8b(val, (int8_t)num); }
        if (num >=        (double)(0) && num < (double)(1LL<<16)) { val->flags.u16b = 1; set_u16b(val, (uint16_t)num); }
        if (num >= (double)-(1LL<<15) && num < (double)(1LL<<15)) { val->flags.s16b = 1; set_s16b(val, (int16_t)num); }
        if (num >=        (double)(0) && num < (double)(1LL<<32)) { val->flags.u32b = 1; set_u32b(val, (uint32_t)num); }
        if (num >= (double)-(1LL<<31) && num < (double)(1LL<<31)) { val->flags.s32b = 1; set_s32b(val, (int32_t)num); }
        if (           (double)(true) &&          (double)(true)) { val->flags.u64b = 1; set_u64b(val, (uint64_t)num); }
        if (           (double)(true) &&          (double)(true)) { val->flags.s64b = 1; set_s64b(val, (int64_t)num); }
        return true;
    }

    return false;
}

bool parse_uservalue_int(const char *nptr, uservalue_t * val)
{
    int64_t num;
    char *endptr;

    assert(nptr != NULL);
    assert(val != NULL);

    zero_uservalue(val);

    /* skip past any whitespace */
    while (isspace(*nptr))
        ++nptr;

    /* now parse it using strtoul */
    errno = 0;
    num = strtoll(nptr, &endptr, 0);
    if ((errno != 0) || (*endptr != '\0'))
        return false;

    /* determine correct flags */
    if (num >=        (0) && num < (1LL<< 8)) { val->flags.u8b  = 1; set_u8b(val, (uint8_t)num); }
    if (num >= -(1LL<< 7) && num < (1LL<< 7)) { val->flags.s8b  = 1; set_s8b(val, (int8_t)num); }
    if (num >=        (0) && num < (1LL<<16)) { val->flags.u16b = 1; set_u16b(val, (uint16_t)num); }
    if (num >= -(1LL<<15) && num < (1LL<<15)) { val->flags.s16b = 1; set_s16b(val, (int16_t)num); }
    if (num >=        (0) && num < (1LL<<32)) { val->flags.u32b = 1; set_u32b(val, (uint32_t)num); }
    if (num >= -(1LL<<31) && num < (1LL<<31)) { val->flags.s32b = 1; set_s32b(val, (int32_t)num); }
    if (           (true) &&          (true)) { val->flags.u64b = 1; set_u64b(val, (uint64_t)num); }
    if (           (true) &&          (true)) { val->flags.s64b = 1; set_s64b(val, (int64_t)num); }

    return true;
}

bool parse_uservalue_float(const char *nptr, uservalue_t * val)
{
    double num;
    char *endptr;
    assert(nptr);
    assert(val);

    zero_uservalue(val);
    while (isspace(*nptr))
        ++nptr;

    errno = 0;
    num = strtod(nptr, &endptr);
    if ((errno != 0) || (*endptr != '\0'))
        return false;
    
    /* I'm not sure how to distinguish float & double, but I guess it's not necessary here */
    val->flags.f32b = val->flags.f64b = 1;
    val->float32_value = (float) num;
    val->float64_value =  num;   
    return true;
}

int flags_to_max_width_in_bytes(match_flags flags)
{
    switch(sm_globals.options.scan_data_type)
    {
        case BYTEARRAY:
            return flags.bytearray_length;
            break;
        case STRING:
            return flags.string_length;
            break;
        default: /* numbers */
                 if (flags.u64b || flags.s64b || flags.f64b) return 8;
            else if (flags.u32b || flags.s32b || flags.f32b) return 4;
            else if (flags.u16b || flags.s16b              ) return 2;
            else if (flags.u8b  || flags.s8b               ) return 1;
            else    /* It can't be a variable of any size */ return 0;
            break;
    }
}

int val_max_width_in_bytes(value_t *val)
{
	return flags_to_max_width_in_bytes(val->flags);
}

#define DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTION(type, typename, signedness_letter) \
type get_##signedness_letter##typename (const value_t const* val) \
{ \
	     if (sizeof(type) <= 1) return (type)get_##signedness_letter##8b(val); \
	else if (sizeof(type) <= 2) return (type)get_##signedness_letter##16b(val); \
	else if (sizeof(type) <= 4) return (type)get_##signedness_letter##32b(val); \
	else if (sizeof(type) <= 8) return (type)get_##signedness_letter##64b(val); \
	else assert(false); \
}
#define DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(type, typename) \
	DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTION(unsigned type, typename, u) \
	DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTION(signed type, typename, s)

DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(char, char)
DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(short, short)
DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(int, int)
DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(long, long)
DEFINE_GET_BY_SYSTEM_DEPENDENT_TYPE_FUNCTIONS(long long, longlong)