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/*
* Copyright 1987, 1988 by the Massachusetts Institute of Technology.
* For copying and distribution information, please see the file
* <Copyright.MIT>.
*
* from: kname_parse.c,v 4.4 88/12/01 14:07:29 jtkohl Exp $
* $FreeBSD$
*/
#if 0
#ifndef lint
static char rcsid[] =
"$FreeBSD$";
#endif /* lint */
#endif
#include <stdio.h>
#include <krb.h>
#include <strings.h>
/* max size of full name */
#define FULL_SZ (ANAME_SZ + INST_SZ + REALM_SZ)
#define NAME 0 /* which field are we in? */
#define INST 1
#define REALM 2
extern char *krb_err_txt[];
/*
* This file contains four routines for handling Kerberos names.
*
* kname_parse() breaks a Kerberos name into its name, instance,
* and realm components.
*
* k_isname(), k_isinst(), and k_isrealm() check a given string to see if
* it's a syntactically legitimate respective part of a Kerberos name,
* returning 1 if it is, 0 if it isn't.
*
* Definition of "syntactically legitimate" names is according to
* the Project Athena Technical Plan Section E.2.1, page 7 "Specifying
* names", version dated 21 Dec 1987.
*/
/*
* kname_parse() takes a Kerberos name "fullname" of the form:
*
* username[.instance][@realm]
*
* and returns the three components ("name", "instance", and "realm"
* in the example above) in the given arguments "np", "ip", and "rp".
*
* If successful, it returns KSUCCESS. If there was an error,
* KNAME_FMT is returned.
*/
int
kname_parse(np, ip, rp, fullname)
char *np, *ip, *rp, *fullname;
{
static char buf[FULL_SZ];
char *rnext, *wnext; /* next char to read, write */
register char c;
int backslash;
int field;
backslash = 0;
rnext = buf;
wnext = np;
field = NAME;
if (strlen(fullname) > FULL_SZ)
return KNAME_FMT;
(void) strcpy(buf, fullname);
while ((c = *rnext++)) {
if (backslash) {
*wnext++ = c;
backslash = 0;
continue;
}
switch (c) {
case '\\':
backslash++;
break;
case '.':
switch (field) {
case NAME:
if (wnext == np)
return KNAME_FMT;
*wnext = '\0';
field = INST;
wnext = ip;
break;
case INST:
return KNAME_FMT;
/* break; */
case REALM:
*wnext++ = c;
break;
default:
fprintf(stderr, "unknown field value\n");
exit(1);
}
break;
case '@':
switch (field) {
case NAME:
if (wnext == np)
return KNAME_FMT;
*ip = '\0';
/* fall through */
case INST:
*wnext = '\0';
field = REALM;
wnext = rp;
break;
case REALM:
return KNAME_FMT;
default:
fprintf(stderr, "unknown field value\n");
exit(1);
}
break;
default:
*wnext++ = c;
}
}
*wnext = '\0';
if ((strlen(np) > ANAME_SZ - 1) ||
(strlen(ip) > INST_SZ - 1) ||
(strlen(rp) > REALM_SZ - 1))
return KNAME_FMT;
return KSUCCESS;
}
/*
* k_isname() returns 1 if the given name is a syntactically legitimate
* Kerberos name; returns 0 if it's not.
*/
int
k_isname(s)
char *s;
{
register char c;
int backslash = 0;
if (!*s)
return 0;
if (strlen(s) > ANAME_SZ - 1)
return 0;
while((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '.':
return 0;
/* break; */
case '@':
return 0;
/* break; */
}
}
return 1;
}
/*
* k_isinst() returns 1 if the given name is a syntactically legitimate
* Kerberos instance; returns 0 if it's not.
*/
int
k_isinst(s)
char *s;
{
register char c;
int backslash = 0;
if (strlen(s) > INST_SZ - 1)
return 0;
while((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '.':
return 0;
/* break; */
case '@':
return 0;
/* break; */
}
}
return 1;
}
/*
* k_isrealm() returns 1 if the given name is a syntactically legitimate
* Kerberos realm; returns 0 if it's not.
*/
int
k_isrealm(s)
char *s;
{
register char c;
int backslash = 0;
if (!*s)
return 0;
if (strlen(s) > REALM_SZ - 1)
return 0;
while((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '@':
return 0;
/* break; */
}
}
return 1;
}
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