74 lines
No EOL
2.4 KiB
C
74 lines
No EOL
2.4 KiB
C
/*
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* Copyright 2016, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Simple program to try running an APF program against a packet.
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#include <libgen.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "apf_interpreter.h"
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// Parses hex in "input". Allocates and fills "*output" with parsed bytes.
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// Returns length in bytes of "*output".
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int parse_hex(char* input, uint8_t** output) {
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int length = strlen(input);
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if (length & 1) {
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fprintf(stderr, "Argument not even number of characters: %s\n", input);
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exit(1);
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}
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length >>= 1;
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*output = malloc(length);
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if (*output == NULL) {
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fprintf(stderr, "Out of memory, tried to allocate %d\n", length);
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exit(1);
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}
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for (int i = 0; i < length; i++) {
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char byte[3] = { input[i*2], input[i*2+1], 0 };
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char* end_ptr;
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(*output)[i] = strtol(byte, &end_ptr, 16);
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if (end_ptr != byte + 2) {
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fprintf(stderr, "Failed to parse hex %s\n", byte);
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exit(1);
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}
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}
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return length;
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}
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int main(int argc, char* argv[]) {
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if (argc != 4) {
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fprintf(stderr,
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"Usage: %s <program> <packet> <program age>\n"
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" program: APF program, in hex\n"
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" packet: Packet to run through program, in hex\n"
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" program age: Age of program in seconds.\n",
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basename(argv[0]));
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exit(1);
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}
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uint8_t* program;
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uint32_t program_len = parse_hex(argv[1], &program);
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uint8_t* packet;
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uint32_t packet_len = parse_hex(argv[2], &packet);
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uint32_t filter_age = atoi(argv[3]);
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int ret = accept_packet(program, program_len, packet, packet_len,
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filter_age);
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printf("Packet %sed\n", ret ? "pass" : "dropp");
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free(program);
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free(packet);
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return ret;
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} |