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
|
/*
* Copyright 2016, The Android Open Source Project
*
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Simple program to try running an APF program against a packet.
#include <libgen.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "apf_interpreter.h"
// Parses hex in "input". Allocates and fills "*output" with parsed bytes.
// Returns length in bytes of "*output".
int parse_hex(char* input, uint8_t** output) {
int length = strlen(input);
if (length & 1) {
fprintf(stderr, "Argument not even number of characters: %s\n", input);
exit(1);
}
length >>= 1;
*output = malloc(length);
if (*output == NULL) {
fprintf(stderr, "Out of memory, tried to allocate %d\n", length);
exit(1);
}
for (int i = 0; i < length; i++) {
char byte[3] = { input[i*2], input[i*2+1], 0 };
char* end_ptr;
(*output)[i] = strtol(byte, &end_ptr, 16);
if (end_ptr != byte + 2) {
fprintf(stderr, "Failed to parse hex %s\n", byte);
exit(1);
}
}
return length;
}
void print_hex(uint8_t* input, int len) {
for (int i = 0; i < len; ++i) {
printf("%02x", input[i]);
}
}
int main(int argc, char* argv[]) {
if (argc < 3 || argc > 5) {
fprintf(stderr,
"Usage: %s <program> <packet> [<data>] [<age>]\n"
" program: APF program, in hex\n"
" packet: Packet to run through program, in hex\n"
" data: Data memory contents, in hex\n"
" age: Age of program in seconds (default: 0)\n",
basename(argv[0]));
exit(1);
}
uint8_t* program;
uint32_t program_len = parse_hex(argv[1], &program);
uint8_t* packet;
uint32_t packet_len = parse_hex(argv[2], &packet);
uint8_t* data = NULL;
uint32_t data_len = argc > 3 ? parse_hex(argv[3], &data) : 0;
uint32_t filter_age = argc > 4 ? atoi(argv[4]) : 0;
int ret = accept_packet(program, program_len, packet, packet_len,
data, data_len, filter_age);
printf("Packet %sed\n", ret ? "pass" : "dropp");
if (data) {
printf("Data: ");
print_hex(data, data_len);
printf("\n");
free(data);
}
free(program);
free(packet);
return ret;
}
|
