300 lines
6.4 KiB
C
300 lines
6.4 KiB
C
/*
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* Copyright (c) 1989, 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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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ttyent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <dirent.h>
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#include <paths.h>
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static char zapchar;
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static FILE *tf;
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static int maxpts = 0;
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static int curpts = 0;
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static int pts_valid = 0;
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static size_t lbsize;
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static char *line;
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#define PTS "pts/"
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#define MALLOCCHUNK 100
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static char *skip(char *);
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static char *value(char *);
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struct ttyent *
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getttynam(tty)
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const char *tty;
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{
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struct ttyent *t;
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if (strncmp(tty, "/dev/", 5) == 0)
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tty += 5;
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setttyent();
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while ( (t = getttyent()) )
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if (!strcmp(tty, t->ty_name))
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break;
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endttyent();
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return (t);
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}
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struct ttyent *
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getttyent()
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{
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static struct ttyent tty;
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static char devpts_name[] = "pts/4294967295";
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char *p;
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int c;
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size_t i;
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if (!tf && !setttyent())
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return (NULL);
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for (;;) {
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if (!fgets(p = line, lbsize, tf)) {
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if (pts_valid == 1 && curpts <= maxpts) {
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sprintf(devpts_name, "pts/%d", curpts++);
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tty.ty_name = devpts_name;
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tty.ty_getty = tty.ty_type = NULL;
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tty.ty_status = TTY_NETWORK;
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tty.ty_window = NULL;
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tty.ty_comment = NULL;
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tty.ty_group = _TTYS_NOGROUP;
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return (&tty);
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}
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return (NULL);
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}
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/* extend buffer if line was too big, and retry */
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while (!index(p, '\n')) {
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i = strlen(p);
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lbsize += MALLOCCHUNK;
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if ((p = realloc(line, lbsize)) == NULL) {
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(void)endttyent();
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return (NULL);
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}
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line = p;
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if (!fgets(&line[i], lbsize - i, tf))
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return (NULL);
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}
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while (isspace((unsigned char)*p))
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++p;
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if (*p && *p != '#')
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break;
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}
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#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1])
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#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
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zapchar = 0;
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tty.ty_name = p;
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tty.ty_status = 0;
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tty.ty_window = NULL;
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tty.ty_group = _TTYS_NOGROUP;
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p = skip(p);
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if (!*(tty.ty_getty = p))
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tty.ty_getty = tty.ty_type = NULL;
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else {
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p = skip(p);
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if (!*(tty.ty_type = p))
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tty.ty_type = NULL;
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else {
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/* compatibility kludge: handle network/dialup specially */
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if (scmp(_TTYS_DIALUP))
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tty.ty_status |= TTY_DIALUP;
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else if (scmp(_TTYS_NETWORK))
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tty.ty_status |= TTY_NETWORK;
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p = skip(p);
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}
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}
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for (; *p; p = skip(p)) {
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if (scmp(_TTYS_OFF))
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tty.ty_status &= ~TTY_ON;
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else if (scmp(_TTYS_ON))
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tty.ty_status |= TTY_ON;
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else if (scmp(_TTYS_SECURE))
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tty.ty_status |= TTY_SECURE;
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else if (scmp(_TTYS_INSECURE))
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tty.ty_status &= ~TTY_SECURE;
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else if (scmp(_TTYS_DIALUP))
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tty.ty_status |= TTY_DIALUP;
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else if (scmp(_TTYS_NETWORK))
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tty.ty_status |= TTY_NETWORK;
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else if (vcmp(_TTYS_WINDOW))
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tty.ty_window = value(p);
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else if (vcmp(_TTYS_GROUP))
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tty.ty_group = value(p);
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else
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break;
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}
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if (zapchar == '#' || *p == '#')
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while ((c = *++p) == ' ' || c == '\t')
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;
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tty.ty_comment = p;
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if (*p == 0)
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tty.ty_comment = 0;
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if ( (p = index(p, '\n')) )
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*p = '\0';
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return (&tty);
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}
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#define QUOTED 1
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/*
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* Skip over the current field, removing quotes, and return a pointer to
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* the next field.
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*/
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static char *
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skip(p)
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char *p;
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{
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char *t;
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int c, q;
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for (q = 0, t = p; (c = *p) != '\0'; p++) {
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if (c == '"') {
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q ^= QUOTED; /* obscure, but nice */
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continue;
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}
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if (q == QUOTED && *p == '\\' && *(p+1) == '"')
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p++;
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*t++ = *p;
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if (q == QUOTED)
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continue;
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if (c == '#') {
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zapchar = c;
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*p = 0;
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break;
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}
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if (c == '\t' || c == ' ' || c == '\n') {
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zapchar = c;
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*p++ = 0;
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while ((c = *p) == '\t' || c == ' ' || c == '\n')
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p++;
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break;
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}
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}
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*--t = '\0';
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return (p);
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}
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static char *
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value(p)
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char *p;
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{
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return ((p = index(p, '=')) ? ++p : NULL);
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}
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int
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setttyent()
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{
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DIR *devpts_dir;
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if (line == NULL) {
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if ((line = malloc(MALLOCCHUNK)) == NULL)
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return (0);
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lbsize = MALLOCCHUNK;
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}
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devpts_dir = opendir(_PATH_DEV PTS);
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if (devpts_dir) {
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struct dirent *dp;
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while ((dp = readdir(devpts_dir))) {
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if (strcmp(dp->d_name, ".") != 0 &&
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strcmp(dp->d_name, "..") != 0) {
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if (atoi(dp->d_name) > maxpts) {
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maxpts = atoi(dp->d_name);
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pts_valid = 1;
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curpts = 0;
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}
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}
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}
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closedir(devpts_dir);
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}
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if (tf) {
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rewind(tf);
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return (1);
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} else if ( (tf = fopen(_PATH_TTYS, "r")) )
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return (1);
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return (0);
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}
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int
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endttyent()
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{
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int rval;
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pts_valid = 0;
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/*
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* NB: Don't free `line' because getttynam()
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* may still be referencing it
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*/
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if (tf) {
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rval = (fclose(tf) != EOF);
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tf = NULL;
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return (rval);
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}
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return (1);
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}
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static int
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isttystat(tty, flag)
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const char *tty;
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int flag;
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{
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struct ttyent *t;
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return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag);
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}
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int
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isdialuptty(tty)
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const char *tty;
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{
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return isttystat(tty, TTY_DIALUP);
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}
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int isnettty(tty)
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const char *tty;
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{
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return isttystat(tty, TTY_NETWORK);
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}
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