78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* dnsconfig.cpp
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* System calls for managing the dns configuration of the current system.
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*/
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#include <sys/dnsconfig.h>
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#include <errno.h>
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#include <string.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/syscall.h>
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namespace Sortix {
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static kthread_mutex_t dnsconfig_lock = KTHREAD_MUTEX_INITIALIZER;
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static struct dnsconfig dnsconfig;
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int sys_getdnsconfig(struct dnsconfig* user_cfg)
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{
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ScopedLock lock(&dnsconfig_lock);
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if ( !CopyToUser(user_cfg, &dnsconfig, sizeof(dnsconfig)) )
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return -1;
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return 0;
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}
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int sys_setdnsconfig(const struct dnsconfig* user_cfg)
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{
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ScopedLock lock(&dnsconfig_lock);
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struct dnsconfig newcfg;
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if ( !CopyFromUser(&newcfg, user_cfg, sizeof(dnsconfig)) )
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return -1;
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if ( DNSCONFIG_MAX_SERVERS < newcfg.servers_count )
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return errno = EINVAL, -1;
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for ( size_t i = 0; i < newcfg.servers_count; i++ )
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{
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struct dnsconfig_server* server = &newcfg.servers[i];
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if ( server->family == AF_INET )
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{
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if ( server->addrsize != sizeof(struct in_addr) )
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return errno = EINVAL, -1;
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memset(&server->addr.in + 1, 0,
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sizeof(server->addr) - sizeof(server->addr.in));
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}
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else if ( server->family == AF_INET6 )
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{
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if ( server->addrsize != sizeof(struct in6_addr) )
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return errno = EINVAL, -1;
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memset(&server->addr.in6 + 1, 0,
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sizeof(server->addr) - sizeof(server->addr.in6));
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}
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else
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return errno = EAFNOSUPPORT, -1;
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}
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for ( size_t i = newcfg.servers_count; i < DNSCONFIG_MAX_SERVERS; i++ )
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memset(&newcfg.servers[i], 0, sizeof(newcfg.servers[i]));
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memcpy(&dnsconfig, &newcfg, sizeof(dnsconfig));
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return 0;
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}
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} // namespace Sortix
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