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/* Copyright (C) 1996-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <utmp.h>
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/* Return the result of ttyname in the buffer pointed to by TTY, which should
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be of length BUF_LEN. If it is too long to fit in this buffer, a
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sufficiently long buffer is allocated using malloc, and returned in TTY.
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0 is returned upon success, -1 otherwise. */
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static int
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tty_name (int fd, char **tty, size_t buf_len)
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{
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int rv; /* Return value. 0 = success. */
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char *buf = *tty; /* Buffer for ttyname, initially the user's. */
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for (;;)
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{
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char *new_buf;
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if (buf_len)
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{
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rv = ttyname_r (fd, buf, buf_len);
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if (rv != 0 || memchr (buf, '\0', buf_len))
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/* We either got an error, or we succeeded and the
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returned name fit in the buffer. */
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break;
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/* Try again with a longer buffer. */
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buf_len += buf_len; /* Double it */
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}
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else
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/* No initial buffer; start out by mallocing one. */
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buf_len = 128; /* First time guess. */
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if (buf != *tty)
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/* We've already malloced another buffer at least once. */
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new_buf = realloc (buf, buf_len);
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else
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new_buf = malloc (buf_len);
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if (! new_buf)
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{
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rv = -1;
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__set_errno (ENOMEM);
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break;
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}
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buf = new_buf;
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}
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if (rv == 0)
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*tty = buf; /* Return buffer to the user. */
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else if (buf != *tty)
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free (buf); /* Free what we malloced when returning an error. */
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return rv;
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}
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void
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login (const struct utmp *ut)
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{
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#ifdef PATH_MAX
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char _tty[PATH_MAX + UT_LINESIZE];
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#else
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char _tty[512 + UT_LINESIZE];
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#endif
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char *tty = _tty;
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int found_tty;
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const char *ttyp;
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struct utmp copy = *ut;
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/* Fill in those fields we supply. */
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copy.ut_type = USER_PROCESS;
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copy.ut_pid = getpid ();
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/* Seek tty. */
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found_tty = tty_name (STDIN_FILENO, &tty, sizeof (_tty));
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if (found_tty < 0)
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found_tty = tty_name (STDOUT_FILENO, &tty, sizeof (_tty));
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if (found_tty < 0)
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found_tty = tty_name (STDERR_FILENO, &tty, sizeof (_tty));
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if (found_tty >= 0)
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{
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/* We only want to insert the name of the tty without path.
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But take care of name like /dev/pts/3. */
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if (strncmp (tty, "/dev/", 5) == 0)
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ttyp = tty + 5; /* Skip the "/dev/". */
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else
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ttyp = basename (tty);
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/* Position to record for this tty. */
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strncpy (copy.ut_line, ttyp, UT_LINESIZE);
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/* Tell that we want to use the UTMP file. */
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if (utmpname (_PATH_UTMP) == 0)
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{
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/* Open UTMP file. */
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setutent ();
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/* Write the entry. */
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pututline (©);
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/* Close UTMP file. */
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endutent ();
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}
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if (tty != _tty)
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free (tty); /* Free buffer malloced by tty_name. */
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}
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else
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/* We provide a default value so that the output does not contain
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an random bytes in this field. */
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strncpy (copy.ut_line, "???", UT_LINESIZE);
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/* Update the WTMP file. Here we have to add a new entry. */
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updwtmp (_PATH_WTMP, ©);
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}
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