1 /*
2 * Copyright 2016, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // Simple program to try running an APF program against a packet.
18
19 #include <libgen.h>
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include "apf_interpreter.h"
26
27 // Parses hex in "input". Allocates and fills "*output" with parsed bytes.
28 // Returns length in bytes of "*output".
parse_hex(char * input,uint8_t ** output)29 int parse_hex(char* input, uint8_t** output) {
30 int length = strlen(input);
31 if (length & 1) {
32 fprintf(stderr, "Argument not even number of characters: %s\n", input);
33 exit(1);
34 }
35 length >>= 1;
36 *output = malloc(length);
37 if (*output == NULL) {
38 fprintf(stderr, "Out of memory, tried to allocate %d\n", length);
39 exit(1);
40 }
41 for (int i = 0; i < length; i++) {
42 char byte[3] = { input[i*2], input[i*2+1], 0 };
43 char* end_ptr;
44 (*output)[i] = strtol(byte, &end_ptr, 16);
45 if (end_ptr != byte + 2) {
46 fprintf(stderr, "Failed to parse hex %s\n", byte);
47 exit(1);
48 }
49 }
50 return length;
51 }
52
main(int argc,char * argv[])53 int main(int argc, char* argv[]) {
54 if (argc != 4) {
55 fprintf(stderr,
56 "Usage: %s <program> <packet> <program age>\n"
57 " program: APF program, in hex\n"
58 " packet: Packet to run through program, in hex\n"
59 " program age: Age of program in seconds.\n",
60 basename(argv[0]));
61 exit(1);
62 }
63 uint8_t* program;
64 uint32_t program_len = parse_hex(argv[1], &program);
65 uint8_t* packet;
66 uint32_t packet_len = parse_hex(argv[2], &packet);
67 uint32_t filter_age = atoi(argv[3]);
68 int ret = accept_packet(program, program_len, packet, packet_len,
69 filter_age);
70 printf("Packet %sed\n", ret ? "pass" : "dropp");
71 free(program);
72 free(packet);
73 return ret;
74 }