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/*
* Copyright 1988 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* Copyright.MIT.
*
* Stream conversion functions for Kerberos administration server
*/
#if 0
#ifndef lint
static char rcsid_kadm_stream_c[] =
"Header: /afs/athena.mit.edu/astaff/project/kerberos/src/lib/kadm/RCS/kadm_stream.c,v 4.2 89/09/26 09:20:48 jtkohl Exp ";
static const char rcsid[] =
"$Id: kadm_stream.c,v 1.1 1995/07/18 16:40:27 mark Exp $";
#endif lint
#endif
/*
kadm_stream.c
this holds the stream support routines for the kerberos administration server
vals_to_stream: converts a vals struct to a stream for transmission
internals build_field_header, vts_[string, char, long, short]
stream_to_vals: converts a stream to a vals struct
internals check_field_header, stv_[string, char, long, short]
error: prints out a kadm error message, returns
fatal: prints out a kadm fatal error message, exits
*/
#include <string.h>
#include "kadm.h"
#define min(a,b) (((a) < (b)) ? (a) : (b))
/*
vals_to_stream
recieves : kadm_vals *, u_char *
returns : a realloced and filled in u_char *
this function creates a byte-stream representation of the kadm_vals structure
*/
int vals_to_stream(Kadm_vals *dt_in, u_char **dt_out)
{
int vsloop, stsize; /* loop counter, stream size */
stsize = build_field_header(dt_in->fields, dt_out);
for (vsloop=31; vsloop>=0; vsloop--)
if (IS_FIELD(vsloop,dt_in->fields)) {
switch (vsloop) {
case KADM_NAME:
stsize+=vts_string(dt_in->name, dt_out, stsize);
break;
case KADM_INST:
stsize+=vts_string(dt_in->instance, dt_out, stsize);
break;
case KADM_EXPDATE:
stsize+=vts_long(dt_in->exp_date, dt_out, stsize);
break;
case KADM_ATTR:
stsize+=vts_short(dt_in->attributes, dt_out, stsize);
break;
case KADM_MAXLIFE:
stsize+=vts_char(dt_in->max_life, dt_out, stsize);
break;
case KADM_DESKEY:
stsize+=vts_long(dt_in->key_high, dt_out, stsize);
stsize+=vts_long(dt_in->key_low, dt_out, stsize);
break;
default:
break;
}
}
return(stsize);
}
int build_field_header(u_char *cont, u_char **st)
{
*st = (u_char *) malloc (4);
bcopy((char *) cont, (char *) *st, 4);
return 4; /* return pointer to current stream location */
}
int vts_string(char *dat, u_char **st, int loc)
{
*st = (u_char *) realloc ((char *)*st, (unsigned) (loc + strlen(dat) + 1));
bcopy(dat, (char *)(*st + loc), strlen(dat)+1);
return strlen(dat)+1;
}
int vts_short(u_short dat, u_char **st, int loc)
{
u_short temp; /* to hold the net order short */
temp = htons(dat); /* convert to network order */
*st = (u_char *) realloc ((char *)*st, (unsigned)(loc + sizeof(u_short)));
bcopy((char *) &temp, (char *)(*st + loc), sizeof(u_short));
return sizeof(u_short);
}
int vts_long(u_long dat, u_char **st, int loc)
{
u_long temp; /* to hold the net order short */
temp = htonl(dat); /* convert to network order */
*st = (u_char *) realloc ((char *)*st, (unsigned)(loc + sizeof(u_long)));
bcopy((char *) &temp, (char *)(*st + loc), sizeof(u_long));
return sizeof(u_long);
}
int vts_char(u_char dat, u_char **st, int loc)
{
*st = (u_char *) realloc ((char *)*st, (unsigned)(loc + sizeof(u_char)));
(*st)[loc] = (u_char) dat;
return 1;
}
/*
stream_to_vals
recieves : u_char *, kadm_vals *
returns : a kadm_vals filled in according to u_char *
this decodes a byte stream represntation of a vals struct into kadm_vals
*/
int stream_to_vals(u_char *dt_in, Kadm_vals *dt_out, int maxlen)
{
register int vsloop, stsize; /* loop counter, stream size */
register int status;
bzero((char *) dt_out, sizeof(*dt_out));
stsize = check_field_header(dt_in, dt_out->fields, maxlen);
if (stsize < 0)
return(-1);
for (vsloop=31; vsloop>=0; vsloop--)
if (IS_FIELD(vsloop,dt_out->fields))
switch (vsloop) {
case KADM_NAME:
if ((status = stv_string(dt_in, dt_out->name, stsize,
sizeof(dt_out->name), maxlen)) < 0)
return(-1);
stsize += status;
break;
case KADM_INST:
if ((status = stv_string(dt_in, dt_out->instance, stsize,
sizeof(dt_out->instance), maxlen)) < 0)
return(-1);
stsize += status;
break;
case KADM_EXPDATE:
if ((status = stv_long(dt_in, &dt_out->exp_date, stsize,
maxlen)) < 0)
return(-1);
stsize += status;
break;
case KADM_ATTR:
if ((status = stv_short(dt_in, &dt_out->attributes, stsize,
maxlen)) < 0)
return(-1);
stsize += status;
break;
case KADM_MAXLIFE:
if ((status = stv_char(dt_in, &dt_out->max_life, stsize,
maxlen)) < 0)
return(-1);
stsize += status;
break;
case KADM_DESKEY:
if ((status = stv_long(dt_in, &dt_out->key_high, stsize,
maxlen)) < 0)
return(-1);
stsize += status;
if ((status = stv_long(dt_in, &dt_out->key_low, stsize,
maxlen)) < 0)
return(-1);
stsize += status;
break;
default:
break;
}
return stsize;
}
int check_field_header(u_char *st, u_char *cont, int maxlen)
{
if (4 > maxlen)
return(-1);
bcopy((char *) st, (char *) cont, 4);
return 4; /* return pointer to current stream location */
}
int stv_string(u_char *st, char *dat, int loc, int stlen, int maxlen)
{
int maxcount; /* max count of chars to copy */
maxcount = min(maxlen - loc, stlen);
(void) strncpy(dat, (char *)st + loc, maxcount);
if (dat[maxcount-1]) /* not null-term --> not enuf room */
return(-1);
return strlen(dat)+1;
}
int stv_short(u_char *st, u_short *dat, int loc, int maxlen)
{
u_short temp; /* to hold the net order short */
if (loc + sizeof(u_short) > maxlen)
return(-1);
bcopy((char *)((u_long)st+(u_long)loc), (char *) &temp, sizeof(u_short));
*dat = ntohs(temp); /* convert to network order */
return sizeof(u_short);
}
int stv_long(u_char *st, u_long *dat, int loc, int maxlen)
{
u_long temp; /* to hold the net order short */
if (loc + sizeof(u_long) > maxlen)
return(-1);
bcopy((char *)((u_long)st+(u_long)loc), (char *) &temp, sizeof(u_long));
*dat = ntohl(temp); /* convert to network order */
return sizeof(u_long);
}
int stv_char(u_char *st, u_char *dat, int loc, int maxlen)
{
if (loc + 1 > maxlen)
return(-1);
*dat = *(st + loc);
return 1;
}
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