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Change TPM2 creation metadata to 'UNIX.ns dataset version' from 'dataset RFC3339 version' ‒ there's only 64 bytes to play with

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наб 2021-11-15 19:00:41 +01:00
parent 9c8ee8d68c
commit 12189bc0d5
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1 changed files with 4 additions and 8 deletions
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src/tpm2.cpp
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@ -34,20 +34,16 @@ static int try_or_passphrase(const char * what, const char * what_for, ESYS_CONT
// TRY_TPM2() unrolled because no constexpr/string-literal-template arguments until C++20, which is not supported by GCC 8, which we need for Buster
if(err != TPM2_RC_SUCCESS)
return fprintf(stderr, "Couldn't %s: %s\n", what, Tss2_RC_Decode(err)), __LINE__;
return 0;
}
TPM2B_DATA tpm2_creation_metadata(const char * dataset_name) {
TPM2B_DATA metadata{};
TPM2B_DATA metadata{}; // 64 bytesish
const auto now = time(nullptr);
const auto now_tm = localtime(&now);
metadata.size = snprintf((char *)metadata.buffer, sizeof(metadata.buffer), "%s %d-%02d-%02dT%02d:%02d:%02d %s", dataset_name, //
now_tm->tm_year + 1900, now_tm->tm_mon + 1, now_tm->tm_mday, now_tm->tm_hour, now_tm->tm_min, now_tm->tm_sec, //
TZPFMS_VERSION) +
1;
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
metadata.size = snprintf((char *)metadata.buffer, sizeof(metadata.buffer), "%" PRIu64 ".%09ld %s %s", ts.tv_sec, ts.tv_nsec, dataset_name, TZPFMS_VERSION) + 1;
metadata.size = metadata.size > sizeof(metadata.buffer) ? sizeof(metadata.buffer) : metadata.size;
// fprintf(stderr, "%" PRIu16 "/%zu: \"%s\"\n", metadata.size, sizeof(metadata.buffer), metadata.buffer);