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[u/mdw/catacomb] / key-attr.c

/* -*-c-*-
 *
 * $Id: key-attr.c,v 1.1 1999/12/22 15:47:48 mdw Exp $
 *
 * Key attribute manipulation
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Catacomb.
 *
 * Catacomb is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * Catacomb is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with Catacomb; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: key-attr.c,v $
 * Revision 1.1  1999/12/22 15:47:48  mdw
 * Major key-management revision.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <mLib/alloc.h>
#include <mLib/sym.h>

#include "key.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @key_chkident@ --- *
 *
 * Arguments:	@const char *p@ = pointer to a type string
 *
 * Returns:	Zero if OK, -1 on error.
 *
 * Use:		Checks whether an identification component string is OK.
 */

int key_chkident(const char *p)
{
  if (!p || !*p)
    return (-1);
  while (*p) {
    if (*p == ':' || *p == '.' || isspace((unsigned char)*p))
      return (-1);
    p++;
  }
  return (0);
}

/* --- @key_chkcomment@ --- *
 *
 * Arguments:	@const char *p@ = pointer to a comment string
 *
 * Returns:	Zero if OK, -1 on error.
 *
 * Use:		Checks whether a comment string is OK.
 */

int key_chkcomment(const char *p)
{
  if (!p)
    return (0);
  if (!*p)
    return (-1);
  while (*p) {
    if (*p == '\n')
      return (-1);
    p++;
  }
  return (0);
}

/* --- @key_mkattriter@ --- *
 *
 * Arguments:	@key_attriter *i@ = pointer to attribute iterator
 *		@key *k@ = pointer to key
 *
 * Returns:	---
 *
 * Use:		Initializes an attribute iterator.  The attributes are
 *		returned by @key_nextattr@.
 */

void key_mkattriter(key_attriter *i, key *k)
{
  sym_mkiter(&i->i, &k->a);
}

/* --- @key_nextattr@ --- *
 *
 * Arguments:	@key_attriter *i@ = pointer to attribute iterator
 *		@const char **n, **v@ = pointers to name and value
 *
 * Returns:	Zero if no attribute available, or nonzero if returned OK.
 *
 * Use:		Returns the next attribute.
 */

int key_nextattr(key_attriter *i, const char **n, const char **v)
{
  key_attr *a = sym_next(&i->i);
  if (!a)
    return (0);
  *n = SYM_NAME(a);
  *v = a->p;
  return (1);
}

/* --- @key_getattr@ --- *
 *
 * Arguments:	@key_file *f@ = pointer to file
 *		@key *k@ = pointer to key
 *		@const char *n@ = pointer to attribute name
 *
 * Returns:	Pointer to attribute value, or null if not found.
 *
 * Use:		Returns the value of a key attribute.
 */

const char *key_getattr(key_file *f, key *k, const char *n)
{
  key_attr *a;
  if ((a = sym_find(&k->a, n, -1, 0, 0)) == 0)
    return (0);
  return (a->p);
}

/* --- @key_putattr@ --- *
 *
 * Arguments:	@key_file *f@ = pointer to file
 *		@key *k@ = pointer to key
 *		@const char *n@ = pointer to attribute name
 *		@const char *v@ = pointer to attribute value or null
 *
 * Returns:	Error code (one of the @KERR@ constants).
 *
 * Use:		Inserts an attribute on a key.  If an attribute with the same
 *		name already exists, it is deleted.  Setting a null value
 *		removes the attribute.
 */

int key_putattr(key_file *f, key *k, const char *n, const char *v)
{
  key_attr *a;
  unsigned found;

  if (!(f->f & KF_WRITE))
    return (KERR_READONLY);

  if (v) {
    a = sym_find(&k->a, n, -1, sizeof(*a), &found);
    if (found)
      free(a->p);
    a->p = xstrdup(v);
  } else if ((a = sym_find(&k->a, n, -1, 0, 0)) != 0) {
    free(a->p);
    sym_remove(&k->a, a);
  }

  f->f |= KF_MODIFIED;
  return (0);
}

/* --- @key_setcomment@ --- *
 *
 * Arguments:	@key_file *f@ = pointer to key file block
 *		@key *k@ = pointer to key block
 *		@const char *c@ = pointer to comment to set, or zero
 *
 * Returns:	Error code (one of the @KERR@ constants).
 *
 * Use:		Replaces the key's current comment with a new one.
 */

int key_setcomment(key_file *f, key *k, const char *c)
{
  if (!(f->f & KF_WRITE))
    return (KERR_READONLY);
  if (key_chkcomment(c))
    return (KERR_BADCOMMENT);
  if (k->c)
    free(k->c);
  if (c)
    k->c = xstrdup(c);
  else
    k->c = 0;
  f->f |= KF_MODIFIED;
  return (0);
}

/* --- @key_settag@ --- *
 *
 * Arguments:	@key_file *f@ = pointer to key file block
 *		@key *k@ = pointer to key block
 *		@const char *tag@ = pointer to comment to set, or zero
 *
 * Returns:	Error code (one of the @KERR@ constants).
 *
 * Use:		Replaces the key's current tag with a new one.
 */

int key_settag(key_file *f, key *k, const char *tag)
{
  key_ref *kr;
  unsigned found;

  if (!(f->f & KF_WRITE))
    return (KERR_READONLY);

  /* --- Make sure the tag is OK --- */

  if (tag && key_chkident(tag))
    return (KERR_BADTAG);

  /* --- See if the new tag is the same as the old one --- */

  if ((!tag && !k->tag) ||
      (tag && k->tag && strcmp(tag, k->tag) == 0))
    return (0);

  /* --- Allocate an entry for the new tag --- */

  if (tag) {
    kr = sym_find(&f->bytag, tag, -1, sizeof(*kr), &found);
    if (found)
      return (KERR_DUPTAG);
    kr->k = k;
  }

  /* --- Remove any existing tag --- */

  if (k->tag) {
    kr = sym_find(&f->bytag, k->tag, -1, 0, 0);
    assert(((void)"No bytag link", kr));
    sym_remove(&f->bytag, kr);
    free(k->tag);
  }

  /* --- Done --- */

  f->f |= KF_MODIFIED;
  if (tag)
    k->tag = xstrdup(tag);
  else
    k->tag = 0;
  return (0);
}

/* --- @key_fulltag@ --- *
 *
 * Arguments:	@key *k@ = pointer to key
 *		@dstr *d@ = pointer to destination string
 *
 * Returns:	---
 *
 * Use:		Emits the key's full tag, which has the form
 *		`ID:TYPE[:TAG]'.  This is used in the textual file format,
 *		and to identify passphrases for locked keys.
 */

void key_fulltag(key *k, dstr *d)
{
  dstr_putf(d, "%08lx:%s", (unsigned long)k->id, k->type);
  if (k->tag)
    dstr_putf(d, ":%s", k->tag);
}

/*----- That's all, folks -------------------------------------------------*/