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Relocate source files to an src/ subdirectory
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
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Joachim Nilsson committed
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/* Initialize and serve a login terminal
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*
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* Copyright (c) 2016 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <err.h>
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#include <errno.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/utsname.h>
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#include <sys/ttydefaults.h> /* Not included by default in musl libc */
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#include <termios.h>
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#include "finit.h"
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#include "helpers.h"
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#include "sig.h"
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#include "utmp-api.h"
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#ifndef _PATH_LOGIN
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#define _PATH_LOGIN "/bin/login"
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#endif
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#define print(s) (void)write(STDOUT_FILENO, s, strlen(s))
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/*
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* Read one character from stdin.
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*/
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static int readch(char *tty)
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{
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int st;
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char ch1;
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st = read(STDIN_FILENO, &ch1, 1);
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if (st == 0) {
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print("\n");
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_exit(0);
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}
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if (st < 0)
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errx(1, "getty: %s: read error", tty);
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return ch1 & 0xFF;
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}
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static void stty(int fd, speed_t speed)
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{
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struct termios term;
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tcdrain(fd);
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if (tcgetattr(fd, &term))
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return;
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cfsetispeed(&term, speed);
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cfsetospeed(&term, speed);
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tcsetattr(fd, TCSAFLUSH, &term);
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tcflush(fd, TCIOFLUSH);
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/* Disable modem specific flags */
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term.c_cflag &= ~(0|CSTOPB|PARENB|PARODD);
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term.c_cflag &= ~CRTSCTS;
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term.c_cflag |= CLOCAL;
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/* Timeouts, minimum chars and default flags */
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term.c_cc[VTIME] = 0;
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term.c_cc[VMIN] = 1;
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term.c_iflag = ICRNL|IXON|IXOFF;
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term.c_oflag = OPOST|ONLCR;
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term.c_cflag |= CS8|CREAD|HUPCL|CBAUDEX;
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term.c_lflag |= ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOKE;
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/* Reset special characters to defaults */
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term.c_cc[VINTR] = CTRL('C');
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term.c_cc[VQUIT] = CTRL('\\');
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term.c_cc[VEOF] = CTRL('D');
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term.c_cc[VEOL] = '\n';
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term.c_cc[VKILL] = CTRL('U');
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term.c_cc[VERASE] = CERASE;
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tcsetattr(fd, TCSANOW, &term);
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/* Clear screen in silent mode */
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if (silent)
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print("\033[r\033[H\033[J");
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}
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/*
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* Parse and display a line from /etc/issue
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*/
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static void do_parse(char *line, struct utsname *uts, char *tty)
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{
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char *s, *s0;
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s0 = line;
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for (s = line; *s != 0; s++) {
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if (*s == '\\') {
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(void)write(1, s0, s - s0);
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s0 = s + 2;
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switch (*++s) {
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case 'l':
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print(tty);
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break;
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case 'm':
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print(uts->machine);
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break;
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case 'n':
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print(uts->nodename);
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break;
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#ifdef _GNU_SOURCE
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case 'o':
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print(uts->domainname);
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break;
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#endif
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case 'r':
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print(uts->release);
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break;
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case 's':
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print(uts->sysname);
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break;
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case 'v':
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print(uts->version);
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break;
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case 0:
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goto leave;
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default:
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s0 = s - 1;
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}
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}
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}
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leave:
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(void)write(1, s0, s - s0);
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}
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/*
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* Parse and display /etc/issue
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*/
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static void do_issue(char *tty)
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{
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FILE *fp;
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char buf[BUFSIZ] = "Welcome to \\s \\v \\n \\l\n\n";
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struct utsname uts;
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/*
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* Get data about this machine.
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*/
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uname(&uts);
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print("\n");
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fp = fopen("/etc/issue", "r");
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if (fp) {
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while (fgets(buf, sizeof(buf), fp))
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do_parse(buf, &uts, tty);
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fclose(fp);
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} else {
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do_parse(buf, &uts, tty);
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}
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do_parse("\\n login: ", &uts, tty);
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}
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/*
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* Handle the process of a GETTY.
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*/
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static void do_getty(char *tty, char *name, size_t len)
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{
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int ch;
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char *np;
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/*
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* Clean up tty name.
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*/
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if (!strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)))
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tty += 5;
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/*
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* Display prompt.
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*/
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ch = ' ';
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*name = '\0';
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while (ch != '\n') {
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do_issue(tty);
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np = name;
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while ((ch = readch(tty)) != '\n') {
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if (np < name + len)
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*np++ = ch;
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}
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*np = '\0';
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if (*name == '\0')
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ch = ' '; /* blank line typed! */
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}
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name[len - 1] = 0;
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}
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/* Execute the login(1) command with the current
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* username as its argument. It will reply to the
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* calling user by typing "Password: "...
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*/
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static int do_login(char *name)
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{
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struct stat st;
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execl(_PATH_LOGIN, _PATH_LOGIN, name, NULL);
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/*
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* Failed to exec login, should be impossible. Try a starting a
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* fallback shell instead.
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*
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* Note: Add /etc/securetty handling.
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*/
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warnx("Failed exec %s, attempting fallback to %s ...", _PATH_LOGIN, _PATH_BSHELL);
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if (fstat(0, &st) == 0 && S_ISCHR(st.st_mode))
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execl(_PATH_BSHELL, _PATH_BSHELL, NULL);
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return 1; /* We shouldn't get here ... */
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}
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static speed_t do_parse_speed(char *baud)
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{
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char *ptr;
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size_t i;
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unsigned long val;
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struct { unsigned long val; speed_t speed; } v2s[] = {
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{ 0, B0 },
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{ 50, B50 },
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{ 75, B75 },
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{ 110, B110 },
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{ 134, B134 },
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{ 150, B150 },
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{ 200, B200 },
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{ 300, B300 },
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{ 600, B600 },
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{ 1200, B1200 },
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{ 1800, B1800 },
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{ 2400, B2400 },
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{ 4800, B4800 },
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{ 9600, B9600 },
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{ 19200, B19200 },
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{ 38400, B38400 },
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{ 57600, B57600 },
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{ 115200, B115200 },
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{ 230400, B230400 },
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{ 460800, B460800 },
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{ 500000, B500000 },
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{ 576000, B576000 },
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{ 921600, B921600 },
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{ 1000000, B1000000 },
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{ 1152000, B1152000 },
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{ 1500000, B1500000 },
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{ 2000000, B2000000 },
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{ 2500000, B2500000 },
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{ 3000000, B3000000 },
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{ 3500000, B3500000 },
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{ 4000000, B4000000 },
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};
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errno = 0;
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val = strtoul(baud, &ptr, 10);
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if (errno || ptr == baud)
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return B0;
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for (i = 0; i < sizeof(v2s) / sizeof(v2s[0]); i++) {
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if (v2s[i].val == val)
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return v2s[i].speed;
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}
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return B0;
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}
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int getty(char *tty, char *baud, char *UNUSED(term), char *user)
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{
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int fd;
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char name[30];
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speed_t speed = B38400;
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struct sigaction sa;
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if (baud) {
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speed = do_parse_speed(baud);
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if (speed == B0) {
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logit(LOG_CRIT, "TTY %s: Invalid speed %s", tty, baud);
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return 1;
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}
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}
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/* Detach from initial controlling TTY */
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vhangup();
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fd = open(tty, O_RDWR);
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if (fd < 0)
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err(1, "Failed opening %s", tty);
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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if (ioctl(STDIN_FILENO, TIOCSCTTY, 1) < 0)
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warn("Failed TIOCSCTTY");
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/*
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* Don't let QUIT dump core.
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*/
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = _exit;
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sigaction(SIGQUIT, &sa, NULL);
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stty(fd, speed);
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close(fd);
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utmp_set_login(tty, NULL);
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if (!user)
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do_getty(tty, name, sizeof(name));
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else
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strlcpy(name, user, sizeof(name));
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return do_login(name);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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