// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'fsverity measure' command
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*
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* Copyright (C) 2018 Google LLC
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*
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* Written by Eric Biggers.
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include "commands.h"
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#include "fsverity_uapi.h"
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#include "hash_algs.h"
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int fsverity_cmd_measure(const struct fsverity_command *cmd,
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int argc, char *argv[])
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{
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struct fsverity_digest *d = NULL;
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struct filedes file;
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char digest_hex[FS_VERITY_MAX_DIGEST_SIZE * 2 + 1];
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const struct fsverity_hash_alg *hash_alg;
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char _hash_alg_name[32];
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const char *hash_alg_name;
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int status;
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int i;
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if (argc < 2)
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goto out_usage;
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d = xzalloc(sizeof(*d) + FS_VERITY_MAX_DIGEST_SIZE);
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for (i = 1; i < argc; i++) {
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d->digest_size = FS_VERITY_MAX_DIGEST_SIZE;
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if (!open_file(&file, argv[i], O_RDONLY, 0))
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goto out_err;
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if (ioctl(file.fd, FS_IOC_MEASURE_VERITY, d) != 0) {
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error_msg_errno("FS_IOC_MEASURE_VERITY failed on '%s'",
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file.name);
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filedes_close(&file);
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goto out_err;
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}
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filedes_close(&file);
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ASSERT(d->digest_size <= FS_VERITY_MAX_DIGEST_SIZE);
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bin2hex(d->digest, d->digest_size, digest_hex);
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hash_alg = find_hash_alg_by_num(d->digest_algorithm);
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if (hash_alg) {
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hash_alg_name = hash_alg->name;
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} else {
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sprintf(_hash_alg_name, "ALG_%u", d->digest_algorithm);
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hash_alg_name = _hash_alg_name;
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}
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printf("%s:%s %s\n", hash_alg_name, digest_hex, argv[i]);
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}
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status = 0;
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out:
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free(d);
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return status;
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out_err:
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status = 1;
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goto out;
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out_usage:
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usage(cmd, stderr);
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status = 2;
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goto out;
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}
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