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/*
* UNG's Not GNU
*
* Copyright (c) 2020 Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _POSIX_C_SOURCE 200809L
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef __linux__
#include <sys/ioctl.h>
#define DEFAULT_GETTY_COMMAND "/bin/login"
#define DEFAULT_GETTY_TYPE "vt100"
#endif
#ifndef DEFAULT_GETTY_COMMAND
#define DEFAULT_GETTY_COMMAND "/sys/bin/login"
#endif
#ifndef DEFAULT_GETTY_DEVICE
#define DEFAULT_GETTY_DEVICE "/dev/console"
#endif
#ifndef DEFAULT_GETTY_TYPE
#define DEFAULT_GETTY_TYPE "ecma-48"
#endif
int main(int argc, char *argv[])
{
char *command = DEFAULT_GETTY_COMMAND;
char *device = DEFAULT_GETTY_DEVICE;
char *type = DEFAULT_GETTY_TYPE;
int c;
while ((c = getopt(argc, argv, "e:d:T:")) != -1) {
switch (c) {
case 'e':
command = optarg;
break;
case 'd':
device = optarg;
break;
case 'T':
type = optarg;
break;
default:
return 1;
}
}
if (argc > optind) {
fprintf(stderr, "getty: unexepcted operands\n");
return 1;
}
setsid();
int fd = open(device, O_RDWR | O_CLOEXEC | O_TTY_INIT, 0600);
if (fd == -1) {
fprintf(stderr, "getty: %s: %s\n", device, strerror(errno));
return 1;
}
if (!isatty(fd)) {
fprintf(stderr, "getty: %s: %s\n", device, strerror(errno));
return 1;
}
#ifdef __linux__
if (ioctl (fd, TIOCSCTTY, (void *) 1) == -1) {
perror("ioctl");
}
#endif
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
setenv("TERM", type, 1);
/* TODO: wordexp() */
char *args[] = { command, NULL };
execv(args[0], args);
return 1;
}
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