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120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
#include "file.hpp"
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#include <fstream>
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#include <ios>
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#include <stdexcept>
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#include <llarp/util/logging.hpp>
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#include <llarp/util/formattable.hpp>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <system_error>
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#ifdef WIN32
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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namespace llarp::util
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{
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static std::streampos
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slurp_file_open(const fs::path& filename, fs::ifstream& in)
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{
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in.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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in.open(filename, std::ios::binary | std::ios::in);
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in.seekg(0, std::ios::end);
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auto size = in.tellg();
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in.seekg(0, std::ios::beg);
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return size;
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}
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std::string
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slurp_file(const fs::path& filename)
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{
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fs::ifstream in;
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std::string contents;
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auto size = slurp_file_open(filename, in);
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contents.resize(size);
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in.read(contents.data(), size);
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return contents;
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}
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size_t
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slurp_file(const fs::path& filename, char* buffer, size_t buffer_size)
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{
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fs::ifstream in;
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auto size = slurp_file_open(filename, in);
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if (static_cast<size_t>(size) > buffer_size)
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throw std::length_error{"file is too large for buffer"};
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in.read(buffer, size);
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return size;
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}
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void
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dump_file(const fs::path& filename, std::string_view contents)
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{
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fs::ofstream out;
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out.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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out.open(filename, std::ios::binary | std::ios::out | std::ios::trunc);
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out.write(contents.data(), static_cast<std::streamsize>(contents.size()));
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}
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static std::error_code
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errno_error()
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{
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int e = errno;
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errno = 0;
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return std::make_error_code(static_cast<std::errc>(e));
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}
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error_code_t
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EnsurePrivateFile(fs::path pathname)
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{
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errno = 0;
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error_code_t ec = errno_error();
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const auto str = pathname.string();
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if (fs::exists(pathname, ec)) // file exists
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{
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auto st = fs::status(pathname);
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auto perms = st.permissions();
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if ((perms & fs::perms::others_exec) != fs::perms::none)
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perms = perms ^ fs::perms::others_exec;
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if ((perms & fs::perms::others_write) != fs::perms::none)
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perms = perms ^ fs::perms::others_write;
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if ((perms & fs::perms::others_write) != fs::perms::none)
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perms = perms ^ fs::perms::others_write;
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if ((perms & fs::perms::group_read) != fs::perms::none)
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perms = perms ^ fs::perms::group_read;
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if ((perms & fs::perms::others_read) != fs::perms::none)
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perms = perms ^ fs::perms::others_read;
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if ((perms & fs::perms::owner_exec) != fs::perms::none)
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perms = perms ^ fs::perms::owner_exec;
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fs::permissions(pathname, perms, ec);
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if (ec)
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llarp::LogError("failed to set permissions on ", pathname);
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}
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else // file is not there
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{
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errno = 0;
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int fd = ::open(str.c_str(), O_RDWR | O_CREAT, 0600);
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ec = errno_error();
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if (fd != -1)
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{
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::close(fd);
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}
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}
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#ifndef WIN32
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if (ec)
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llarp::LogError("failed to ensure ", str, ", ", ec.message());
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return ec;
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#else
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return {};
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#endif
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}
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} // namespace llarp::util
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