sortix-mirror/kernel/dnsconfig.cpp
2021-06-13 23:27:52 +02:00

77 lines
2.4 KiB
C++

/*
* Copyright (c) 2016 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.
*
* dnsconfig.cpp
* System calls for managing the dns configuration of the current system.
*/
#include <sys/dnsconfig.h>
#include <errno.h>
#include <string.h>
#include <sortix/kernel/copy.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/kthread.h>
#include <sortix/kernel/syscall.h>
namespace Sortix {
static kthread_mutex_t dnsconfig_lock = KTHREAD_MUTEX_INITIALIZER;
static struct dnsconfig dnsconfig;
int sys_getdnsconfig(struct dnsconfig* user_cfg)
{
ScopedLock lock(&dnsconfig_lock);
if ( !CopyToUser(user_cfg, &dnsconfig, sizeof(dnsconfig)) )
return -1;
return 0;
}
int sys_setdnsconfig(const struct dnsconfig* user_cfg)
{
ScopedLock lock(&dnsconfig_lock);
struct dnsconfig newcfg;
if ( !CopyFromUser(&newcfg, user_cfg, sizeof(dnsconfig)) )
return -1;
if ( DNSCONFIG_MAX_SERVERS < newcfg.servers_count )
return errno = EINVAL, -1;
for ( size_t i = 0; i < newcfg.servers_count; i++ )
{
struct dnsconfig_server* server = &newcfg.servers[i];
if ( server->family == AF_INET )
{
if ( server->addrsize != sizeof(struct in_addr) )
return errno = EINVAL, -1;
memset(&server->addr.in + 1, 0,
sizeof(server->addr) - sizeof(server->addr.in));
}
else if ( server->family == AF_INET6 )
{
if ( server->addrsize != sizeof(struct in6_addr) )
return errno = EINVAL, -1;
memset(&server->addr.in6 + 1, 0,
sizeof(server->addr) - sizeof(server->addr.in6));
}
else
return errno = EAFNOSUPPORT, -1;
}
for ( size_t i = newcfg.servers_count; i < DNSCONFIG_MAX_SERVERS; i++ )
memset(&newcfg.servers[i], 0, sizeof(newcfg.servers[i]));
memcpy(&dnsconfig, &newcfg, sizeof(dnsconfig));
return 0;
}
} // namespace Sortix