89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
/**
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* @brief getty - Manage a TTY.
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*
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* Wraps a serial port (or other dumb connection) with a pty
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* and manages a login for it.
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*
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* This is not really what 'getty' should do - see @ref login-loop.c
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* for something more akin to the "getty" on other platforms.
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*
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* @copyright
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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
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* Copyright (C) 2018 K. Lange
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pty.h>
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#include <sys/wait.h>
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#include <sys/fswait.h>
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int main(int argc, char * argv[]) {
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int fd_serial;
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char * file = "/dev/ttyS0";
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char * user = NULL;
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if (getuid() != 0) {
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fprintf(stderr, "%s: only root can do that\n", argv[0]);
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return 1;
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}
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int opt;
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while ((opt = getopt(argc, argv, "a:")) != -1) {
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switch (opt) {
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case 'a':
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user = optarg;
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break;
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}
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}
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if (optind < argc) {
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file = argv[optind];
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optind++;
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}
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fd_serial = open(file, O_RDWR);
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if (fd_serial < 0) {
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perror("open");
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return 1;
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}
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setsid();
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dup2(fd_serial, 0);
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dup2(fd_serial, 1);
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dup2(fd_serial, 2);
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system("stty sane");
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if (optind < argc) {
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if (*argv[optind] >= '0' && *argv[optind] <= '9' && strlen(argv[optind]) < 30) {
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char tmp[100];
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snprintf(tmp, 100, "stty %s", argv[optind]);
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system(tmp);
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optind++;
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}
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}
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if (optind < argc) {
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/* If there's still arguments, assume TERM value */
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setenv("TERM", argv[optind], 1);
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optind++;
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}
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system("ttysize -q");
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char * tokens[] = {"/bin/login",NULL,NULL,NULL};
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if (user) {
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tokens[1] = "-f";
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tokens[2] = user;
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}
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execvp(tokens[0], tokens);
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exit(1);
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}
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