freebsd-skq/eBones/krb/kparse.c
Geoff Rehmet 60643d379b Initial import of eBones.
(Including all changes for FreeBSD - importing the original eBones distribution
would be too complex at this stage, since I don't have access to Piero's 
CVS.)
(If you want to include eBones in your system, don't forget to include
MAKE_EBONES in /etc/make.conf.)
(This stuff is now also suppable from braae.ru.ac.za.)

Bones originally from MIT SIPB.
Original port to FreeBSD 1.x  by Piero Serini.
Moved to FreeBSD 2.0 by Doug Rabson and Geoff Rehmet.
Nice bug fixes from Doug Rabson.
1994-09-30 14:50:09 +00:00

764 lines
18 KiB
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/*
* Copyright 1988 by the Massachusetts Institute of Technology.
* For copying and distribution information, please see the file
* <Copyright.MIT>.
*
* Purpose:
* This module was developed to parse the "~/.klogin" files for
* Kerberos-authenticated rlogin/rcp/rsh services. However, it is
* general purpose and can be used to parse any such parameter file.
*
* The parameter file should consist of one or more entries, with each
* entry on a separate line and consisting of zero or more
* "keyword=value" combinations. The keyword is case insensitive, but
* the value is not. Any string may be enclosed in quotes, and
* c-style "\" literals are supported. A comma may be used to
* separate the k/v combinations, and multiple commas are ignored.
* Whitespace (blank or tab) may be used freely and is ignored.
*
* Full error processing is available. When PS_BAD_KEYWORD or
* PS_SYNTAX is returned from fGetParameterSet(), the string ErrorMsg
* contains a meaningful error message.
*
* Keywords and their default values are programmed by an external
* table.
*
* Routines:
* fGetParameterSet() parse one line of the parameter file
* fGetKeywordValue() parse one "keyword=value" combo
* fGetToken() parse one token
*
*
* from: kparse.c,v 4.5 89/01/21 17:20:39 jtkohl Exp $
* $Id: kparse.c,v 1.2 1994/07/19 19:25:42 g89r4222 Exp $
*/
#ifndef lint
static char rcsid[] =
"$Id: kparse.c,v 1.2 1994/07/19 19:25:42 g89r4222 Exp $";
#endif lint
#include <stdio.h>
#include <ctype.h>
#include <kparse.h>
#ifndef FALSE
#define FALSE 0
#define TRUE 1
#endif
#define void int
#define MAXKEY 80
#define MAXVALUE 80
char *malloc();
char *strcpy();
int LineNbr=1; /* current line nbr in parameter file */
char ErrorMsg[80]; /* meaningful only when KV_SYNTAX, PS_SYNTAX,
* or PS_BAD_KEYWORD is returned by
* fGetKeywordValue or fGetParameterSet */
int fGetParameterSet( fp,parm,parmcount )
FILE *fp;
parmtable parm[];
int parmcount;
{
int rc,i;
char keyword[MAXKEY];
char value[MAXVALUE];
while (TRUE) {
rc=fGetKeywordValue(fp,keyword,MAXKEY,value,MAXVALUE);
switch (rc) {
case KV_EOF:
return(PS_EOF);
case KV_EOL:
return(PS_OKAY);
case KV_SYNTAX:
return(PS_SYNTAX);
case KV_OKAY:
/*
* got a reasonable keyword/value pair. Search the
* parameter table to see if we recognize the keyword; if
* not, return an error. If we DO recognize it, make sure
* it has not already been given. If not already given,
* save the value.
*/
for (i=0; i<parmcount; i++) {
if (strcmp(strutol(keyword),parm[i].keyword)==0) {
if (parm[i].value) {
sprintf(ErrorMsg,"duplicate keyword \"%s\" found",
keyword);
return(PS_BAD_KEYWORD);
}
parm[i].value = strsave( value );
break;
}
}
if (i >= parmcount) {
sprintf(ErrorMsg, "unrecognized keyword \"%s\" found",
keyword);
return(PS_BAD_KEYWORD);
}
break;
default:
sprintf(ErrorMsg,
"panic: bad return (%d) from fGetToken()",rc);
break;
}
}
}
/*
* Routine: ParmCompare
*
* Purpose:
* ParmCompare checks a specified value for a particular keyword.
* fails if keyword not found or keyword found but the value was
* different. Like strcmp, ParmCompare returns 0 for a match found, -1
* otherwise
*/
int ParmCompare( parm, parmcount, keyword, value )
parmtable parm[];
int parmcount;
char *keyword;
char *value;
{
int i;
for (i=0; i<parmcount; i++) {
if (strcmp(parm[i].keyword,keyword)==0) {
if (parm[i].value) {
return(strcmp(parm[i].value,value));
} else {
return(strcmp(parm[i].defvalue,value));
}
}
}
return(-1);
}
void FreeParameterSet(parm,parmcount)
parmtable parm[];
int parmcount;
{
int i;
for (i=0; i<parmcount; i++) {
if (parm[i].value) {
free(parm[i].value);
parm[i].value = (char *)NULL;
}
}
}
int fGetKeywordValue( fp, keyword, klen, value, vlen )
FILE *fp;
char *keyword;
int klen;
char *value;
int vlen;
{
int rc;
int gotit;
*keyword = *value = '\0'; /* preset strings to NULL */
/*
* Looking for a keyword.
* return an exception for EOF or BAD_QSTRING
* ignore leading WHITEspace
* ignore any number of leading commas
* newline means we have all the parms for this
* statement; give an indication that there is
* nothing more on this line.
* stop looking if we find QSTRING, STRING, or NUMBER
* return syntax error for any other PUNKtuation
*/
gotit = FALSE;
do {
rc = fGetToken(fp,keyword,klen);
switch (rc) {
case GTOK_WHITE:
break;
case GTOK_EOF:
return(KV_EOF);
case GTOK_BAD_QSTRING:
sprintf(ErrorMsg,"unterminated string \"%s found",keyword);
return(KV_SYNTAX);
case GTOK_PUNK:
if (strcmp("\n",keyword)==0) {
return(KV_EOL);
} else if (strcmp(",",keyword)!=0) {
sprintf(ErrorMsg,"expecting rvalue, found \'%s\'",keyword);
}
break;
case GTOK_STRING:
case GTOK_QSTRING:
case GTOK_NUMBER:
gotit = TRUE;
break;
default:
sprintf(ErrorMsg,"panic: bad return (%d) from fGetToken()",rc);
return(KV_SYNTAX);
}
} while (!gotit);
/*
* now we expect an equal sign.
* skip any whitespace
* stop looking if we find an equal sign
* anything else causes a syntax error
*/
gotit = FALSE;
do {
rc = fGetToken(fp,value,vlen);
switch (rc) {
case GTOK_WHITE:
break;
case GTOK_BAD_QSTRING:
sprintf(ErrorMsg,
"expecting \'=\', found unterminated string \"%s",
value);
return(KV_SYNTAX);
case GTOK_PUNK:
if (strcmp("=",value)==0) {
gotit = TRUE;
} else {
if (strcmp("\n",value)==0) {
sprintf(ErrorMsg,"expecting \"=\", found newline");
fUngetChar('\n',fp);
} else {
sprintf(ErrorMsg,
"expecting rvalue, found \'%s\'",keyword);
}
return(KV_SYNTAX);
}
break;
case GTOK_STRING:
case GTOK_QSTRING:
case GTOK_NUMBER:
sprintf(ErrorMsg,"expecting \'=\', found \"%s\"",value);
return(KV_SYNTAX);
case GTOK_EOF:
sprintf(ErrorMsg,"expecting \'=\', found EOF");
return(KV_SYNTAX);
default:
sprintf(ErrorMsg,
"panic: bad return (%d) from fGetToken()",rc);
return(KV_SYNTAX);
}
} while ( !gotit );
/*
* got the keyword and equal sign, now get a value.
* ignore any whitespace
* any punctuation is a syntax error
*/
gotit = FALSE;
do {
rc = fGetToken(fp,value,vlen);
switch (rc) {
case GTOK_WHITE:
break;
case GTOK_EOF:
sprintf(ErrorMsg,"expecting rvalue, found EOF");
return(KV_SYNTAX);
case GTOK_BAD_QSTRING:
sprintf(ErrorMsg,"unterminated quoted string \"%s",value);
return(KV_SYNTAX);
case GTOK_PUNK:
if (strcmp("\n",value)==0) {
sprintf(ErrorMsg,"expecting rvalue, found newline");
fUngetChar('\n',fp);
} else {
sprintf(ErrorMsg,
"expecting rvalue, found \'%s\'",value);
}
return(KV_SYNTAX);
break;
case GTOK_STRING:
case GTOK_QSTRING:
case GTOK_NUMBER:
gotit = TRUE;
return(KV_OKAY);
default:
sprintf(ErrorMsg,
"panic: bad return (%d) from fGetToken()",rc);
return(KV_SYNTAX);
}
} while ( !gotit );
/*NOTREACHED*/
}
/*
* Routine Name: fGetToken
*
* Function: read the next token from the specified file.
* A token is defined as a group of characters
* terminated by a white space char (SPACE, CR,
* LF, FF, TAB). The token returned is stripped of
* both leading and trailing white space, and is
* terminated by a NULL terminator. An alternate
* definition of a token is a string enclosed in
* single or double quotes.
*
* Explicit Parameters:
* fp pointer to the input FILE
* dest pointer to destination buffer
* maxlen length of the destination buffer. The buffer
* length INCLUDES the NULL terminator.
*
* Implicit Parameters: stderr where the "token too long" message goes
*
* External Procedures: fgetc
*
* Side Effects: None
*
* Return Value: A token classification value, as
* defined in kparse.h. Note that the
* classification for end of file is
* always zero.
*/
int fGetToken(fp, dest, maxlen)
FILE *fp;
char *dest;
int maxlen;
{
int ch='\0';
int len=0;
char *p = dest;
int digits;
ch=fGetChar(fp);
/*
* check for a quoted string. If found, take all characters
* that fit until a closing quote is found. Note that this
* algorithm will not behave well for a string which is too long.
*/
if (ISQUOTE(ch)) {
int done = FALSE;
do {
ch = fGetChar(fp);
done = ((maxlen<++len)||ISLINEFEED(ch)||(ch==EOF)
||ISQUOTE(ch));
if (ch=='\\')
ch = fGetLiteral(fp);
if (!done)
*p++ = ch;
else if ((ch!=EOF) && !ISQUOTE(ch))
fUngetChar(ch,fp);
} while (!done);
*p = '\0';
if (ISLINEFEED(ch)) return(GTOK_BAD_QSTRING);
return(GTOK_QSTRING);
}
/*
* Not a quoted string. If its a token character (rules are
* defined via the ISTOKENCHAR macro, in kparse.h) take it and all
* token chars following it until we run out of space.
*/
digits=TRUE;
if (ISTOKENCHAR(ch)) {
while ( (ISTOKENCHAR(ch)) && len<maxlen-1 ) {
if (!isdigit(ch)) digits=FALSE;
*p++ = ch;
len++;
ch = fGetChar(fp);
};
*p = '\0';
if (ch!=EOF) {
fUngetChar(ch,fp);
}
if (digits) {
return(GTOK_NUMBER);
} else {
return(GTOK_STRING);
}
}
/*
* Neither a quoted string nor a token character. Return a string
* with just that one character in it.
*/
if (ch==EOF) {
return(GTOK_EOF);
}
if (!ISWHITESPACE(ch)) {
*p++ = ch;
*p='\0';
} else {
*p++ = ' '; /* white space is always the
* blank character */
*p='\0';
/*
* The character is a white space. Flush all additional white
* space.
*/
while (ISWHITESPACE(ch) && ((ch=fGetChar(fp)) != EOF))
;
if (ch!=EOF) {
fUngetChar(ch,fp);
}
return(GTOK_WHITE);
}
return(GTOK_PUNK);
}
/*
* fGetLiteral is called after we find a '\' in the input stream. A
* string of numbers following the backslash are converted to the
* appropriate value; hex (0xn), octal (0n), and decimal (otherwise)
* are all supported. If the char after the \ is not a number, we
* special case certain values (\n, \f, \r, \b) or return a literal
* otherwise (useful for \", for example).
*/
fGetLiteral(fp)
FILE *fp;
{
int ch;
int n=0;
int base;
ch = fGetChar(fp);
if (!isdigit(ch)) {
switch (ch) {
case 'n': return('\n');
case 'f': return('\f');
case 'r': return('\r');
case 'b': return('\b');
default: return(ch);
}
}
/*
* got a number. might be decimal (no prefix), octal (prefix 0),
* or hexadecimal (prefix 0x). Set the base appropriately.
*/
if (ch!='0') {
base=10; /* its a decimal number */
} else {
/*
* found a zero, its either hex or octal
*/
ch = fGetChar(fp);
if ((ch!='x') && (ch!='X')) {
base=010;
} else {
ch = fGetChar(fp);
base=0x10;
}
}
switch (base) {
case 010: /* octal */
while (ISOCTAL(ch)) {
n = (n*base) + ch - '0';
ch = fGetChar(fp);
}
break;
case 10: /* decimal */
while (isdigit(ch)) {
n = (n*base) + ch - '0';
ch = fGetChar(fp);
}
break;
case 0x10: /* hexadecimal */
while (isxdigit(ch)) {
if (isdigit(ch)) {
n = (n*base) + ch - '0';
} else {
n = (n*base) + toupper(ch) - 'A' + 0xA ;
}
ch = fGetChar(fp);
}
break;
default:
fprintf(stderr,"fGetLiteral() died real bad. Fix gettoken.c.");
exit(1);
break;
}
fUngetChar(ch,fp);
return(n);
}
/*
* exactly the same as ungetc(3) except that the line number of the
* input file is maintained.
*/
fUngetChar(ch,fp)
int ch;
FILE *fp;
{
if (ch=='\n') LineNbr--;
return(ungetc(ch,fp));
}
/*
* exactly the same as fgetc(3) except that the line number of the
* input file is maintained.
*/
fGetChar(fp)
FILE *fp;
{
int ch = fgetc(fp);
if (ch=='\n') LineNbr++;
return(ch);
}
/*
* Routine Name: strsave
*
* Function: return a pointer to a saved copy of the
* input string. the copy will be allocated
* as large as necessary.
*
* Explicit Parameters: pointer to string to save
*
* Implicit Parameters: None
*
* External Procedures: malloc,strcpy,strlen
*
* Side Effects: None
*
* Return Value: pointer to copied string
*
*/
char * strsave(p)
char *p;
{
return(strcpy(malloc(strlen(p)+1),p));
}
/*
* strutol changes all characters in a string to lower case, in place.
* the pointer to the beginning of the string is returned.
*/
char * strutol( start )
char *start;
{
char *q;
for (q=start; *q; q++)
if (isupper(*q))
*q=tolower(*q);
return(start);
}
#ifdef GTOK_TEST /* mainline test routine for fGetToken() */
#define MAXTOKEN 100
char *pgm = "gettoken";
main(argc,argv)
int argc;
char **argv;
{
char *p;
int type;
FILE *fp;
if (--argc) {
fp = fopen(*++argv,"ra");
if (fp == (FILE *)NULL) {
fprintf(stderr,"can\'t open \"%s\"\n",*argv);
}
} else
fp = stdin;
p = malloc(MAXTOKEN);
while (type = fGetToken(fp,p,MAXTOKEN)) {
switch(type) {
case GTOK_BAD_QSTRING:
printf("BAD QSTRING!\t");
break;
case GTOK_EOF:
printf("EOF!\t");
break;
case GTOK_QSTRING:
printf("QSTRING\t");
break;
case GTOK_STRING:
printf("STRING\t");
break;
case GTOK_NUMBER:
printf("NUMBER\t");
break;
case GTOK_PUNK:
printf("PUNK\t");
break;
case GTOK_WHITE:
printf("WHITE\t");
break;
default:
printf("HUH?\t");
break;
}
if (*p=='\n')
printf("\\n\n");
else
printf("%s\n",p);
}
exit(0);
}
#endif
#ifdef KVTEST
main(argc,argv)
int argc;
char **argv;
{
int rc,ch;
FILE *fp;
char key[MAXKEY],valu[MAXVALUE];
char *filename;
if (argc != 2) {
fprintf(stderr,"usage: test <filename>\n");
exit(1);
}
if (!(fp=fopen(*++argv,"r"))) {
fprintf(stderr,"can\'t open input file \"%s\"\n",filename);
exit(1);
}
filename = *argv;
while ((rc=fGetKeywordValue(fp,key,MAXKEY,valu,MAXVALUE))!=KV_EOF){
switch (rc) {
case KV_EOL:
printf("%s, line %d: nada mas.\n",filename,LineNbr-1);
break;
case KV_SYNTAX:
printf("%s, line %d: syntax error: %s\n",
filename,LineNbr,ErrorMsg);
while ( ((ch=fGetChar(fp))!=EOF) && (ch!='\n') );
break;
case KV_OKAY:
printf("%s, line %d: okay, %s=\"%s\"\n",
filename,LineNbr,key,valu);
break;
default:
printf("panic: bad return (%d) from fGetKeywordValue\n",rc);
break;
}
}
printf("EOF");
fclose(fp);
exit(0);
}
#endif
#ifdef PSTEST
parmtable kparm[] = {
/* keyword, default, found value */
{ "user", "", (char *)NULL },
{ "realm", "Athena", (char *)NULL },
{ "instance", "", (char *)NULL }
};
main(argc,argv)
int argc;
char **argv;
{
int rc,i,ch;
FILE *fp;
char *filename;
if (argc != 2) {
fprintf(stderr,"usage: test <filename>\n");
exit(1);
}
if (!(fp=fopen(*++argv,"r"))) {
fprintf(stderr,"can\'t open input file \"%s\"\n",filename);
exit(1);
}
filename = *argv;
while ((rc=fGetParameterSet(fp,kparm,PARMCOUNT(kparm))) != PS_EOF) {
switch (rc) {
case PS_BAD_KEYWORD:
printf("%s, line %d: %s\n",filename,LineNbr,ErrorMsg);
while ( ((ch=fGetChar(fp))!=EOF) && (ch!='\n') );
break;
case PS_SYNTAX:
printf("%s, line %d: syntax error: %s\n",
filename,LineNbr,ErrorMsg);
while ( ((ch=fGetChar(fp))!=EOF) && (ch!='\n') );
break;
case PS_OKAY:
printf("%s, line %d: valid parameter set found:\n",
filename,LineNbr-1);
for (i=0; i<PARMCOUNT(kparm); i++) {
printf("\t%s = \"%s\"\n",kparm[i].keyword,
(kparm[i].value ? kparm[i].value
: kparm[i].defvalue));
}
break;
default:
printf("panic: bad return (%d) from fGetParameterSet\n",rc);
break;
}
FreeParameterSet(kparm,PARMCOUNT(kparm));
}
printf("EOF");
fclose(fp);
exit(0);
}
#endif