mirror of
https://github.com/kidfromjupiter/nearby.git
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103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#include <random>
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#include <systemd/sd-id128.h>
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#include "absl/strings/str_cat.h"
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#include "internal/platform/implementation/linux/utils.h"
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#include "internal/platform/logging.h"
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namespace nearby {
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namespace linux {
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std::optional<Uuid> UuidFromString(const std::string &uuid_str) {
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sd_id128_t uuid;
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if (auto ret = sd_id128_from_string(uuid_str.c_str(), &uuid); ret < 0)
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return std::nullopt;
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const int ONE = 1;
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if (*(reinterpret_cast<const char *>(&ONE)) ==
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1) { // On a little endian platform
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uint64_t msb = static_cast<uint64_t>(uuid.bytes[7]) +
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(static_cast<uint64_t>(uuid.bytes[6]) << 8) +
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(static_cast<uint64_t>(uuid.bytes[5]) << 16) +
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(static_cast<uint64_t>(uuid.bytes[4]) << 24) +
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(static_cast<uint64_t>(uuid.bytes[3]) << 32) +
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(static_cast<uint64_t>(uuid.bytes[2]) << 40) +
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(static_cast<uint64_t>(uuid.bytes[1]) << 48) +
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(static_cast<uint64_t>(uuid.bytes[0]) << 56);
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uint64_t lsb = static_cast<uint64_t>(uuid.bytes[15]) +
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(static_cast<uint64_t>(uuid.bytes[14]) << 8) +
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(static_cast<uint64_t>(uuid.bytes[13]) << 16) +
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(static_cast<uint64_t>(uuid.bytes[12]) << 24) +
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(static_cast<uint64_t>(uuid.bytes[11]) << 32) +
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(static_cast<uint64_t>(uuid.bytes[10]) << 40) +
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(static_cast<uint64_t>(uuid.bytes[9]) << 48) +
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(static_cast<uint64_t>(uuid.bytes[8]) << 56);
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return Uuid(msb, lsb);
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}
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return Uuid(uuid.qwords[0], uuid.qwords[1]);
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}
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std::optional<std::string> NewUuidStr() {
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sd_id128_t id;
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char id_cstr[SD_ID128_UUID_STRING_MAX];
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if (auto ret = sd_id128_randomize(&id); ret < 0) {
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LOG(ERROR) << __func__ << ": could not generate a random UUID: "
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<< std::strerror(ret);
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return std::nullopt;
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}
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return std::string(sd_id128_to_uuid_string(id, id_cstr));
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}
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std::string RandString(std::string allowed_chars, size_t length) {
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thread_local static std::random_device device{};
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std::mt19937 gen{device()};
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std::uniform_int_distribution<size_t> dist(0, allowed_chars.length() - 1);
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std::string s;
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s.reserve(length);
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for (auto i = 0; i < length; i++) {
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s += allowed_chars[dist(gen)];
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}
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return s;
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}
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std::string RandSSID() {
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std::string allowed_chars =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789";
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return absl::StrCat("DIRECT-", RandString(allowed_chars, 25));
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}
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std::string RandWPAPassphrase() {
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std::string allowed_chars =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789"
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"!\"#$%&'()*+,-./[\\]^_`~{|}";
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return RandString(allowed_chars, 63);
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}
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} // namespace linux
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} // namespace nearby
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