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UserspaceEmulator: Intercept sendto()

Browse source 
With this, `ue /bin/ntpquery` can be used to test sendto() and
recvfrom() in ue. (It eventually hits an unimplemented FILD_RM64,
but not before doing emulated network i/o and printing response
details.)
This commit is contained in:
Nico Weber 2020-09-15 15:43:23 -04:00 • committed by Andreas Kling
parent e2f32b8f9d
commit f0018aca1d
2 changed files with 17 additions and 0 deletions
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16
DevTools/UserspaceEmulator/Emulator.cpp
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@ -354,6 +354,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$listen(arg1, arg2);
case SC_select:
return virt$select(arg1);
case SC_sendto:
return virt$sendto(arg1);
case SC_recvfrom:
return virt$recvfrom(arg1);
case SC_kill:
@ -619,6 +621,20 @@ int Emulator::virt$recvfrom(FlatPtr params_addr)
return rc;
}
int Emulator::virt$sendto(FlatPtr params_addr)
{
Syscall::SC_sendto_params params;
mmu().copy_from_vm(&params, params_addr, sizeof(params));
auto buffer = mmu().copy_buffer_from_vm((FlatPtr)params.data.data, params.data.size);
sockaddr_storage address;
if (params.addr)
mmu().copy_from_vm(&address, (FlatPtr)params.addr, min(sizeof(address), (size_t)params.addr_length));
return sendto(params.sockfd, buffer.data(), buffer.size(), params.flags, params.addr ? (struct sockaddr*)&address : nullptr, params.addr_length);
}
int Emulator::virt$select(FlatPtr params_addr)
{
Syscall::SC_select_params params;