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sortix--sortix/kernel/sockopt.cpp

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/*
* Copyright (c) 2014 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* sockopt.cpp
* getsockopt() and setsockopt() utility functions.
*/
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <sortix/kernel/ioctx.h>
#include <sortix/kernel/sockopt.h>
namespace Sortix {
bool sockopt_fetch_uintmax(uintmax_t* optval_ptr, ioctx_t* ctx,
const void* option_value, size_t option_size)
{
uintmax_t optval;
if ( option_size == 0 )
{
optval = 0;
}
else if ( option_size == 1 )
{
uint8_t truncated;
if ( !ctx->copy_from_src(&truncated, option_value, sizeof(truncated)) )
return false;
optval = truncated;
}
else if ( option_size == 2 )
{
uint16_t truncated;
if ( !ctx->copy_from_src(&truncated, option_value, sizeof(truncated)) )
return false;
optval = truncated;
}
else if ( option_size == 4 )
{
uint32_t truncated;
if ( !ctx->copy_from_src(&truncated, option_value, sizeof(truncated)) )
return false;
optval = truncated;
}
else if ( option_size == 8 )
{
uint64_t truncated;
if ( !ctx->copy_from_src(&truncated, option_value, sizeof(truncated)) )
return false;
optval = truncated;
}
#if UINT64_MAX < UINTMAX_MAX
#error "Add support for your large uintmax_t"
#endif
else
{
return errno = EINVAL, false;
}
return *optval_ptr = optval, true;
}
bool sockopt_return_uintmax(uintmax_t optval, ioctx_t* ctx,
void* option_value, size_t* option_size_ptr)
{
size_t option_size;
if ( !ctx->copy_from_src(&option_size, option_size_ptr, sizeof(option_size)) )
return false;
if ( /*0 <= option_size &&*/ option_size < 1 )
{
option_size = 0;
}
else if ( 1 <= option_size && option_size < 2 )
{
if ( UINT8_MAX < optval )
return errno = ERANGE, false;
uint8_t value = optval;
option_size = sizeof(value);
if ( !ctx->copy_to_dest(option_value, &value, sizeof(value)) )
return false;
}
else if ( 2 <= option_size && option_size < 4 )
{
if ( UINT16_MAX < optval )
return errno = ERANGE, false;
uint16_t value = optval;
option_size = sizeof(value);
if ( !ctx->copy_to_dest(option_value, &value, sizeof(value)) )
return false;
}
else if ( 4 <= option_size && option_size < 8 )
{
if ( UINT32_MAX < optval )
return errno = ERANGE, false;
uint32_t value = optval;
option_size = sizeof(value);
if ( !ctx->copy_to_dest(option_value, &value, sizeof(value)) )
return false;
}
else if ( 8 <= option_size /* && option_size < 16 */ )
{
#if UINT64_MAX < UINTMAX_MAX
#error "Add support for your large uintmax_t"
#endif
uint64_t value = optval;
option_size = sizeof(value);
if ( !ctx->copy_to_dest(option_value, &value, sizeof(value)) )
return false;
}
if ( !ctx->copy_to_dest(option_size_ptr, &option_size, sizeof(option_size)) )
return false;
return true;
}
} // namespace Sortix