141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* $OpenBSD: ttyname.c,v 1.21 2024/01/22 17:22:58 deraadt Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <db.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.h>
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#include <limits.h>
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#include <errno.h>
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#include "thread_private.h"
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static char buf[TTY_NAME_MAX];
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static int oldttyname(struct stat *, char *, size_t);
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char *
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ttyname(int fd)
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{
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_THREAD_PRIVATE_KEY(ttyname);
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char *bufp = (char *) _THREAD_PRIVATE(ttyname, buf, NULL);
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int err;
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if (bufp == NULL)
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return NULL;
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err = ttyname_r(fd, bufp, sizeof buf);
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if (err) {
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errno = err;
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return NULL;
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}
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return bufp;
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}
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DEF_WEAK(ttyname);
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int
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ttyname_r(int fd, char *buf, size_t len)
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{
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struct stat sb;
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DB *db;
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DBT data, key;
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struct {
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mode_t type;
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dev_t dev;
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} bkey;
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/* Must be a terminal. */
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if (!isatty(fd))
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return (errno);
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/* Must be a character device. */
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if (fstat(fd, &sb))
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return (errno);
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if (!S_ISCHR(sb.st_mode))
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return (ENOTTY);
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if (len < sizeof(_PATH_DEV))
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return (ERANGE);
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memcpy(buf, _PATH_DEV, sizeof(_PATH_DEV));
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if ((db = __hash_open(_PATH_DEVDB, O_RDONLY, 0, NULL, 0))) {
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memset(&bkey, 0, sizeof(bkey));
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bkey.type = S_IFCHR;
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bkey.dev = sb.st_rdev;
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key.data = &bkey;
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key.size = sizeof(bkey);
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if (!(db->get)(db, &key, &data, 0)) {
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if (data.size > len - (sizeof(_PATH_DEV) - 1)) {
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(void)(db->close)(db);
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return (ERANGE);
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}
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memcpy(buf + sizeof(_PATH_DEV) - 1, data.data,
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data.size);
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(void)(db->close)(db);
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return (0);
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}
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(void)(db->close)(db);
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}
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return (oldttyname(&sb, buf, len));
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}
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DEF_WEAK(ttyname_r);
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static int
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oldttyname(struct stat *sb, char *buf, size_t len)
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{
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struct dirent *dirp;
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DIR *dp;
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struct stat dsb;
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int error = ENOTTY;
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if ((dp = opendir(_PATH_DEV)) == NULL)
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return (errno);
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while ((dirp = readdir(dp))) {
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if (dirp->d_type != DT_CHR && dirp->d_type != DT_UNKNOWN)
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continue;
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if (fstatat(dirfd(dp), dirp->d_name, &dsb, AT_SYMLINK_NOFOLLOW)
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|| !S_ISCHR(dsb.st_mode) || sb->st_rdev != dsb.st_rdev)
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continue;
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if (dirp->d_namlen > len - sizeof(_PATH_DEV)) {
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error = ERANGE;
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} else {
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memcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name,
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dirp->d_namlen + 1);
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error = 0;
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}
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break;
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}
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(void)closedir(dp);
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return (error);
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}
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