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/** |
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* This file is part of the CernVM File System. |
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* |
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* UUID generation and caching. |
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*/ |
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#define __STDC_FORMAT_MACROS |
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#include "uuid.h" |
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#include <cassert> |
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#include <cstdio> |
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#include <cstring> |
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#include "util/pointer.h" |
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#include "util/posix.h" |
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#include "util/string.h" |
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using namespace std; // NOLINT |
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namespace cvmfs { |
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Uuid *Uuid::Create(const string &store_path) { |
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UniquePtr<Uuid> uuid(new Uuid()); |
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✓✓ |
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if (store_path == "") { |
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uuid->MkUuid(); |
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return uuid.Release(); |
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} |
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FILE *f = fopen(store_path.c_str(), "r"); |
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✓✓ |
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if (f == NULL) { |
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// Create and store |
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uuid->MkUuid(); |
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string uuid_str = uuid->uuid(); |
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string path_tmp; |
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FILE *f_tmp = CreateTempFile(store_path + "_tmp", |
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S_IWUSR | S_IWGRP | S_IRUSR | S_IRGRP | S_IROTH, "w", &path_tmp); |
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✓✓ |
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if (!f_tmp) |
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return NULL; |
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int written = fprintf(f_tmp, "%s\n", uuid_str.c_str()); |
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fclose(f_tmp); |
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✗✓ |
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if (written != static_cast<int>(uuid_str.length() + 1)) { |
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unlink(path_tmp.c_str()); |
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return NULL; |
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} |
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✗✓ |
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if (rename(path_tmp.c_str(), store_path.c_str()) != 0) { |
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unlink(path_tmp.c_str()); |
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return NULL; |
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} |
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return uuid.Release(); |
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} |
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// Read from cached file |
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bool retval = GetLineFile(f, &uuid->uuid_); |
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fclose(f); |
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✓✓ |
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if (!retval) |
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return NULL; |
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int nitems = sscanf(uuid->uuid_.c_str(), |
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"%08" SCNx32 "-%04" SCNx16 "-%04" SCNx16 "-%04" SCNx16 "-%08" SCNx32 "%04" |
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SCNx16, |
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&uuid->uuid_presentation_.split.a, &uuid->uuid_presentation_.split.b, |
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&uuid->uuid_presentation_.split.c, &uuid->uuid_presentation_.split.d, |
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&uuid->uuid_presentation_.split.e1, &uuid->uuid_presentation_.split.e2); |
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✓✓ |
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if (nitems != 6) |
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return NULL; |
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return uuid.Release(); |
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} |
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string Uuid::CreateOneTime() { |
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Uuid uuid; |
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uuid.MkUuid(); |
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return uuid.uuid_; |
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} |
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/** |
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* Creates a new UUID in canonical string representation and overwrites uuid_ |
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* with the result. |
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*/ |
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void Uuid::MkUuid() { |
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uuid_t new_uuid; |
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uuid_generate(new_uuid); |
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assert(sizeof(new_uuid) == 16); |
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memcpy(uuid_presentation_.uuid, new_uuid, sizeof(uuid_presentation_.uuid)); |
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// Canonical UUID format, including trailing \0 |
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unsigned uuid_len = 8+1+4+1+4+1+4+1+12+1; |
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char uuid_cstr[uuid_len]; |
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snprintf(uuid_cstr, uuid_len, "%08x-%04x-%04x-%04x-%08x%04x", |
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uuid_presentation_.split.a, uuid_presentation_.split.b, |
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uuid_presentation_.split.c, uuid_presentation_.split.d, |
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uuid_presentation_.split.e1, uuid_presentation_.split.e2); |
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uuid_ = string(uuid_cstr); |
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} |
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Uuid::Uuid() { |
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memset(&uuid_presentation_, 0, sizeof(uuid_presentation_)); |
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} |
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} // namespace cvmfs |