74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
/*
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* Copyright (c) 2014, 2022 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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* hostname.cpp
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* System calls for managing the hostname of the current system.
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*/
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#include <brand.h>
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#include <errno.h>
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#include <string.h>
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#include <sortix/limits.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 hostname_lock = KTHREAD_MUTEX_INITIALIZER;
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static char hostname[HOST_NAME_MAX + 1] = BRAND_DEFAULT_HOSTNAME;
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static size_t hostname_length = 6;
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int sys_gethostname(char* dst_name, size_t dst_name_size)
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{
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if ( dst_name_size == 0 )
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return errno = EINVAL, -1;
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size_t dst_name_length = dst_name_size - 1;
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ScopedLock lock(&hostname_lock);
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if ( dst_name_length < hostname_length )
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errno = ERANGE;
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if ( hostname_length < dst_name_length )
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dst_name_length = hostname_length;
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if ( !CopyToUser(dst_name, hostname, dst_name_length) )
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return -1;
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char nul = '\0';
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if ( !CopyToUser(dst_name + dst_name_length, &nul, 1) )
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return -1;
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return 0;
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}
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int sys_sethostname(const char* src_name, size_t src_name_size)
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{
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char new_hostname[HOST_NAME_MAX + 1];
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if ( sizeof(new_hostname) < src_name_size )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(new_hostname, src_name, src_name_size) )
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return -1;
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size_t new_hostname_length = strnlen(new_hostname, src_name_size);
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if ( HOST_NAME_MAX < new_hostname_length )
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return errno = EINVAL, -1;
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new_hostname[new_hostname_length] = '\0';
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ScopedLock lock(&hostname_lock);
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memcpy(hostname, new_hostname, new_hostname_length + 1);
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hostname_length = new_hostname_length;
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return 0;
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}
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} // namespace Sortix
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