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LibIPC: Support sending file descriptors :^)

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It is now possible to use the special IPC::File type in message arguments. In
C++, the type is nothing more than a wrapper over a file descriptor. But when
serializing/deserializing IPC::File arguments, LibIPC will use the sendfd/recvfd
kernel APIs instead of sending the integer inline.

This makes it quite convenient to pass files over IPC, and will allow us to
significantly tighten sandboxes in the future :^)

Closes https://github.com/SerenityOS/serenity/issues/3643
This commit is contained in:
Sergey Bugaev 2020-11-21 21:59:12 +03:00 • committed by Andreas Kling
parent fa2e3e2be4
commit 23dc3ff0c2
9 changed files with 148 additions and 50 deletions
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5
Libraries/LibIPC/Decoder.h
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@ -44,8 +44,9 @@ inline bool decode(Decoder&, T&)
class Decoder {
public:
explicit Decoder(InputMemoryStream& stream)
Decoder(InputMemoryStream& stream, int sockfd)
: m_stream(stream)
, m_sockfd(sockfd)
{
}
@ -63,6 +64,7 @@ public:
bool decode(ByteBuffer&);
bool decode(URL&);
bool decode(Dictionary&);
bool decode(File&);
template<typename K, typename V>
bool decode(HashMap<K, V>& hashmap)
{
@ -124,6 +126,7 @@ public:
private:
InputMemoryStream& m_stream;
int m_sockfd { -1 };
};
}