toaruos/apps/hostname.c

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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2013-2018 K. Lange
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*
* hostname
*
* Prints or sets the system hostname.
*/
#include <stdio.h>
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#include <unistd.h>
#include <string.h>
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int main(int argc, char * argv[]) {
if ((argc > 1 && argv[1][0] == '-') || (argc < 2)) {
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char tmp[256] = {0};
gethostname(tmp, 255);
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printf("%s\n", tmp);
return 0;
} else {
if (geteuid() != 0) {
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fprintf(stderr,"Must be root to set hostname.\n");
return 1;
} else {
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sethostname(argv[1], strlen(argv[1]));
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FILE * file = fopen("/etc/hostname", "w");
if (!file) {
return 1;
} else {
fprintf(file, "%s\n", argv[1]);
fclose(file);
return 0;
}
}
}
return 0;
}