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47 lines
934 B
C++
47 lines
934 B
C++
#pragma once
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <cerrno>
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namespace llarp::vpn
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{
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class permission_error : public std::runtime_error
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{
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public:
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using std::runtime_error::runtime_error;
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};
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struct IOCTL
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{
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const int _fd;
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explicit IOCTL(int af) : _fd{::socket(af, SOCK_DGRAM, IPPROTO_IP)}
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{
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if (_fd == -1)
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throw std::invalid_argument{strerror(errno)};
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};
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~IOCTL()
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{
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::close(_fd);
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}
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template <typename Command, typename... Args>
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void
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ioctl(Command cmd, Args&&... args)
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{
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if (::ioctl(_fd, cmd, std::forward<Args>(args)...) == -1)
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{
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if (errno == EACCES)
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{
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throw permission_error{"we are not allowed to call this ioctl"};
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}
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else
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throw std::runtime_error("ioctl failed: " + std::string{strerror(errno)});
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}
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}
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};
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} // namespace llarp::vpn
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