telnetd/libtelnet/getent.c

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#ifndef __GNO__
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)getent.c 8.2 (Berkeley) 12/15/93";
#endif
#endif /* not lint */
#include <stdlib.h>
#include <string.h>
#include "misc-proto.h"
static char *area;
static char gettytab[] = "/etc/gettytab";
/*ARGSUSED*/
int
getent(char *cp __unused, const char *name)
{
int retval;
char *tempnam, *dba[2] = { gettytab, NULL };
tempnam = strdup(name);
retval = cgetent(&area, dba, tempnam) == 0 ? 1 : 0;
free(tempnam);
return(retval);
}
/*ARGSUSED*/
char *
Getstr(const char *id, char **cpp __unused)
{
int retval;
char *answer, *tempid;
tempid = strdup(id);
retval = cgetstr(area, tempid, &answer);
free(tempid);
return((retval > 0) ? answer : NULL);
}
#else
/* On GNO, use code for this taken from GNO's getty. */
/*
* Copyright (c) 1983 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef __GNO__
#ifndef lint
static char sccsid[] = "@(#)gettytab.c 5.5 (Berkeley) 2/25/91";
#endif /* not lint */
#endif
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <paths.h>
#ifndef _PATH_GETTYTAB
#define _PATH_GETTYTAB "/etc/gettytab"
#endif
#define TABBUFSIZ 512
static char *tbuf;
int hopcount; /* detect infinite loops in termcap, init 0 */
int nchktc(void);
int namatch(char *np);
static char * skip (register char *bp);
static char * decode (register char *str, char **area);
/*
* Get an entry for terminal name in buffer bp,
* from the termcap file. Parse is very rudimentary;
* we just notice escaped newlines.
*/
int
getent(char *bp, char *name)
{
register char *cp;
register int c;
register int i = 0, cnt = 0;
static char ibuf[TABBUFSIZ];
char *cp2;
int tf;
tbuf = bp;
tf = open(_PATH_GETTYTAB, O_RDONLY);
if (tf < 0)
return (-1);
for (;;) {
cp = bp;
for (;;) {
if (i == cnt) {
cnt = read(tf, ibuf, TABBUFSIZ);
if (cnt <= 0) {
close(tf);
return (0);
}
i = 0;
}
c = ibuf[i++];
if (c == '\n' || c == '\r') {
if (cp > bp && cp[-1] == '\\'){
cp--;
continue;
}
break;
}
if (cp >= bp+TABBUFSIZ) {
write(STDERR_FILENO,"Gettytab entry too long\n", 24);
break;
} else
*cp++ = c;
}
*cp = 0;
/*
* The real work for the match.
*/
if (namatch(name)) {
close(tf);
return(nchktc());
}
}
}
/*
* tnchktc: check the last entry, see if it's tc=xxx. If so,
* recursively find xxx and append that entry (minus the names)
* to take the place of the tc=xxx entry. This allows termcap
* entries to say "like an HP2621 but doesn't turn on the labels".
* Note that this works because of the left to right scan.
*/
#define MAXHOP 32
int
nchktc(void)
{
register char *p, *q;
char tcname[16]; /* name of similar terminal */
char *tcbuf;
/*char tcbuf[TABBUFSIZ];*/
char *holdtbuf = tbuf;
int l;
tcbuf = malloc(TABBUFSIZ);
p = tbuf + strlen(tbuf) - 2; /* before the last colon */
while (*--p != ':')
if (p<tbuf) {
write(STDERR_FILENO, "Bad gettytab entry\n", 19);
free(tcbuf);
return (0);
}
p++;
/* p now points to beginning of last field */
if (p[0] != 't' || p[1] != 'c') {
free(tcbuf);
return(1);
}
strcpy(tcname,p+3);
q = tcname;
while (q && *q != ':')
q++;
*q = 0;
if (++hopcount > MAXHOP) {
write(STDERR_FILENO, "Getty: infinite tc= loop\n", 25);
free(tcbuf);
return (0);
}
if (getent(tcbuf, tcname) != 1) {
free(tcbuf);
return(0);
}
for (q=tcbuf; *q != ':'; q++)
;
l = p - holdtbuf + strlen(q);
if (l > TABBUFSIZ) {
write(STDERR_FILENO, "Gettytab entry too long\n", 24);
q[TABBUFSIZ - (p-tbuf)] = 0;
}
strcpy(p, q+1);
tbuf = holdtbuf;
free(tcbuf);
return(1);
}
/*
* Tnamatch deals with name matching. The first field of the termcap
* entry is a sequence of names separated by |'s, so we compare
* against each such name. The normal : terminator after the last
* name (before the first field) stops us.
*/
int
namatch(char *np)
{
register char *Np, *Bp;
Bp = tbuf;
if (*Bp == '#')
return(0);
for (;;) {
for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
continue;
if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
return (1);
while (*Bp && *Bp != ':' && *Bp != '|')
Bp++;
if (*Bp == 0 || *Bp == ':')
return (0);
Bp++;
}
}
/*
* Skip to the next field. Notice that this is very dumb, not
* knowing about \: escapes or any such. If necessary, :'s can be put
* into the termcap file in octal.
*/
static char *
skip(register char *bp)
{
while (*bp && *bp != ':')
bp++;
if (*bp == ':')
bp++;
return (bp);
}
/*
* Return the (numeric) option id.
* Numeric options look like
* li#80
* i.e. the option string is separated from the numeric value by
* a # character. If the option is not found we return -1.
* Note that we handle octal numbers beginning with 0.
*/
long
getnum(char *id)
{
register long i, base;
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (*bp == 0)
return (-1);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return(-1);
if (*bp != '#')
continue;
bp++;
base = 10;
if (*bp == '0')
base = 8;
i = 0;
while (isdigit(*bp))
i *= base, i += *bp++ - '0';
return (i);
}
}
/*
* Handle a flag option.
* Flag options are given "naked", i.e. followed by a : or the end
* of the buffer. Return 1 if we find the option, or 0 if it is
* not given.
*/
int
getflag (char *id)
{
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (!*bp)
return (-1);
if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
if (!*bp || *bp == ':')
return (1);
else if (*bp == '!')
return (0);
else if (*bp == '@')
return(-1);
}
}
}
/*
* Get a string valued option.
* These are given as
* cl=^Z
* Much decoding is done on the strings, and the strings are
* placed in area, which is a ref parameter which is updated.
* No checking on area overflow.
*/
char *
Getstr(char *id, char **area)
{
register char *bp = tbuf;
for (;;) {
bp = skip(bp);
if (!*bp)
return (0);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return(0);
if (*bp != '=')
continue;
bp++;
return (decode(bp, area));
}
}
/*
* Tdecode does the grung work to decode the
* string capability escapes.
*/
static char *
decode(register char *str, char **area)
{
register char *cp;
register int c;
register char *dp;
int i;
cp = *area;
while ((c = *str++) && c != ':') {
switch (c) {
case '^':
c = *str++ & 037;
break;
case '\\':
dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
c = *str++;
nextc:
if (*dp++ == c) {
c = *dp++;
break;
}
dp++;
if (*dp)
goto nextc;
if (isdigit(c)) {
c -= '0', i = 2;
do
c <<= 3, c |= *str++ - '0';
while (--i && isdigit(*str));
}
break;
}
*cp++ = c;
}
*cp++ = 0;
str = *area;
*area = cp;
return (str);
}
#endif