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- /* vim: tabstop=4 shiftwidth=4 noexpandtab
- * This file is part of ToaruOS and is released under the terms
- * of the NCSA / University of Illinois License - see LICENSE.md
- * Copyright (C) 2018 K. Lange
- *
- * getty - Manage a TTY.
- *
- * Wraps a serial port (or other dumb connection) with a pty
- * and manages a login for it.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <pty.h>
- #include <sys/wait.h>
- #include <sys/fswait.h>
- int main(int argc, char * argv[]) {
- int fd_serial;
- char * file = "/dev/ttyS0";
- char * user = NULL;
- if (getuid() != 0) {
- fprintf(stderr, "%s: only root can do that\n", argv[0]);
- return 1;
- }
- int opt;
- while ((opt = getopt(argc, argv, "a:")) != -1) {
- switch (opt) {
- case 'a':
- user = optarg;
- break;
- }
- }
- if (optind < argc) {
- file = argv[optind];
- }
- fd_serial = open(file, O_RDWR);
- if (fd_serial < 0) {
- perror("open");
- return 1;
- }
- setsid();
- dup2(fd_serial, 0);
- dup2(fd_serial, 1);
- dup2(fd_serial, 2);
- system("stty sane");
- system("ttysize -q");
- char * tokens[] = {"/bin/login",NULL,NULL,NULL};
- if (user) {
- tokens[1] = "-f";
- tokens[2] = user;
- }
- execvp(tokens[0], tokens);
- exit(1);
- }
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