/[winpt]/trunk/Src/wptKeyCache.cpp
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revision 164 by twoaday, Fri Jan 20 09:19:15 2006 UTC revision 209 by twoaday, Wed May 3 14:34:08 2006 UTC
# Line 1  Line 1 
1  /* wptKeyCache.cpp- Caching for the pub- and the secring  /* wptKeyCache.cpp- Caching for the pub- and the secring
2   *      Copyright (C) 2001-2006 Timo Schulz   *      Copyright (C) 2001-2006 Timo Schulz
3   *   *
4   * This file is part of MyGPGME.   * This file is part of WinPT.
5   *   *
6   * MyGPGME is free software; you can redistribute it and/or modify   * WinPT is free software; you can redistribute it and/or modify
7   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
8   * the Free Software Foundation; either version 2 of the License, or   * the Free Software Foundation; either version 2 of the License, or
9   * (at your option) any later version.   * (at your option) any later version.
10   *   *
11   * MyGPGME is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   * GNU General Public License for more details.   * GNU General Public License for more details.
# Line 36  Line 36 
36  #include "wptErrors.h"  #include "wptErrors.h"
37  #include "wptW32API.h"  #include "wptW32API.h"
38  #include "wptGPG.h"  #include "wptGPG.h"
39    #include "wptTypes.h"
40    #include "wptCommonCtl.h"
41    #include "wptContext.h"
42    #include "wptKeyEdit.h"
43    #include "wptUTF8.h"
44    
45    
46  /* Attribute list which holds the image data. */  /* Attribute list which holds the image data. */
# Line 49  struct attr_list_s { Line 54  struct attr_list_s {
54  typedef struct attr_list_s *attr_list_t;  typedef struct attr_list_s *attr_list_t;
55    
56    
57    /* Free attribute list @ctx. */
58  void  void
59  free_attr_list (attr_list_t ctx)  free_attr_list (attr_list_t ctx)
60  {  {
61      attr_list_t n;      attr_list_t n;
62      while (ctx) {      while (ctx) {
63          n = ctx->next;          n = ctx->next;
64          free (ctx->fpr);          safe_free (ctx->fpr);
65          free (ctx->d);          safe_free (ctx->d);
66          ctx = n;          ctx = n;
67      }      }
68  }  }
# Line 81  parse_attr_list (FILE *fp, const BYTE *d Line 87  parse_attr_list (FILE *fp, const BYTE *d
87          buffer = buf+9+10;          buffer = buf+9+10;
88          pos = 0;          pos = 0;
89          c = (attr_list_t)calloc (1, sizeof *c);          c = (attr_list_t)calloc (1, sizeof *c);
90            if (!c)
91                BUG (0);
92          p = strtok (buffer, " ");          p = strtok (buffer, " ");
93          while (p != NULL) {          while (p != NULL) {
94              switch (pos) {              switch (pos) {
# Line 102  parse_attr_list (FILE *fp, const BYTE *d Line 110  parse_attr_list (FILE *fp, const BYTE *d
110              pos++;              pos++;
111              p = strtok (NULL, " ");              p = strtok (NULL, " ");
112          }          }
         /*printf ("id=%s octets=%d flags=%d\n", c->fpr, c->octets, c->flags);*/  
113          if (!*ctx)          if (!*ctx)
114              *ctx = c;              *ctx = c;
115          else {          else {
# Line 111  parse_attr_list (FILE *fp, const BYTE *d Line 118  parse_attr_list (FILE *fp, const BYTE *d
118              t->next = c;              t->next = c;
119          }          }
120          c->d = (unsigned char*)malloc (c->octets);          c->d = (unsigned char*)malloc (c->octets);
121            if (!c->d)
122                BUG (0);
123          memcpy (c->d, data, c->octets);          memcpy (c->d, data, c->octets);
124          data += c->octets;          data += c->octets;
125          datlen -= c->octets;          datlen -= c->octets;
# Line 121  parse_attr_list (FILE *fp, const BYTE *d Line 130  parse_attr_list (FILE *fp, const BYTE *d
130  }  }
131    
132    
 /* Always use the $users temp folder. */  
 static FILE*  
 w32_tmpfile (char *tmp, DWORD tmplen)  
 {  
     char id[16];  
   
     if (!GetTempPath (tmplen-17, tmp))  
         return NULL;  
     if (tmp[strlen (tmp)-1] != '\\')  
         strcat (tmp, "\\");  
     _snprintf (id, sizeof (id)-1, "%lu", GetTickCount ());  
     strcat (tmp, id);  
     return fopen (tmp, "w+b");  
 }  
   
   
133  static int  static int
134  parse_attr_data (const char *keyid, attr_list_t *list)  parse_attr_data (const char *keyid, attr_list_t *list)
135  {  {
136      gpgme_error_t err;      gpgme_error_t err;
137      FILE *tmp;      FILE *tmp;    
     char *status, tmpnam[MAX_PATH+1];  
138      BYTE *data;      BYTE *data;
139      DWORD ndata;      char *status, tmpnam[MAX_PATH+1];
140        DWORD ndata = 0;
141    
142      err = gpg_get_photoid_data (keyid, &status, &data, &ndata);      err = gpg_get_photoid_data (keyid, &status, &data, &ndata);
143      if (err)      if (err)
144          return err;          return err;
145    
146      if (ndata > 0 && (tmp = w32_tmpfile (tmpnam, MAX_PATH)) != NULL) {      get_temp_name (tmpnam, MAX_PATH, NULL);
147        tmp = fopen (tmpnam, "w+b");
148        if (ndata > 0 && tmp != NULL) {
149          fwrite (status, 1, strlen (status), tmp);          fwrite (status, 1, strlen (status), tmp);
150          fflush (tmp);          fflush (tmp);
151          rewind (tmp);          rewind (tmp);
# Line 187  parse_secring (gpg_keycache_t cache, con Line 182  parse_secring (gpg_keycache_t cache, con
182    
183      gpg_iobuf_ioctl (inp, 3, 1, NULL);      gpg_iobuf_ioctl (inp, 3, 1, NULL);
184      pkt = (PACKET*)calloc (1, sizeof *pkt);      pkt = (PACKET*)calloc (1, sizeof *pkt);
185        if (!pkt)
186            BUG (0);
187      gpg_init_packet (pkt);      gpg_init_packet (pkt);
188      while (gpg_parse_packet (inp, pkt) != -1) {      while (gpg_parse_packet (inp, pkt) != -1) {
189          if (pkt->pkttype == PKT_SECRET_KEY) {          if (pkt->pkttype == PKT_SECRET_KEY) {
# Line 230  keycache_update_photo (gpg_keycache_t ct Line 227  keycache_update_photo (gpg_keycache_t ct
227      fnd->attrib.flags = dat->flags;      fnd->attrib.flags = dat->flags;
228      fnd->attrib.len = dat->octets;      fnd->attrib.len = dat->octets;
229      fnd->attrib.d = (unsigned char*)malloc (dat->octets);      fnd->attrib.d = (unsigned char*)malloc (dat->octets);
230        if (!fnd->attrib.d)
231            BUG (0);
232      memcpy (fnd->attrib.d, dat->d, dat->octets);      memcpy (fnd->attrib.d, dat->d, dat->octets);
233      return 0;      return 0;
234  }  }
# Line 255  keycache_update_photos (gpg_keycache_t c Line 254  keycache_update_photos (gpg_keycache_t c
254  }  }
255    
256    
257    static void
258    keycache_decode_uid (struct keycache_s *ctx)
259    {
260        gpgme_user_id_t u;
261        struct native_uid_s *n, *t;
262    
263        for (u = ctx->key->uids; u; u = u->next) {
264            n = (struct native_uid_s*)calloc (1, sizeof *n);
265            if (!n)
266                BUG (0);
267            if (is_8bit_string (u->uid)) {
268                n->malloced = 1;
269                n->uid = utf8_to_native (u->uid);
270                if (u->name != NULL)
271                    n->name = utf8_to_native (u->name);
272                if (u->email != NULL)
273                    n->email = strdup (u->email);
274                if (u->comment != NULL)
275                    n->comment = utf8_to_native (u->comment);
276            }
277            else {
278                n->malloced = 0;
279                n->uid = u->uid;
280                n->name = u->name;
281                n->comment = u->comment;
282                n->email = u->email;
283            }
284            n->signatures = u->signatures;
285            n->validity = u->validity;
286            n->revoked = u->revoked;
287            if (!ctx->uids)
288                ctx->uids = n;
289            else {
290                for (t = ctx->uids; t->next; t=t->next)
291                    ;
292                t->next = n;          
293            }
294        }
295    }
296    
297    
298    /* Store utf8 decoded user IDs in the code to avoid in-place decoding. */
299    static void
300    keycache_decode_uids (gpg_keycache_t ctx)
301    {
302        struct keycache_s *c;
303    
304        for (c = ctx->item; c; c = c->next)
305            keycache_decode_uid (c);
306    }
307    
308    
309    static void
310    free_native_uids (struct native_uid_s **r_n)
311    {
312        struct native_uid_s *t;
313        struct native_uid_s *n = *r_n;
314    
315        while (n != NULL) {
316            t = n->next;
317            if (n->malloced) {
318                safe_free (n->uid);
319                safe_free (n->name);
320                safe_free (n->comment);
321                safe_free (n->email);
322                safe_free (n->uid);
323            }
324            safe_free (n);
325            n = t;
326        }
327        *r_n = NULL;
328    }
329    
330    
331    
332  /* Merge the information from the keyrings into the key cache structure. */  /* Merge the information from the keyrings into the key cache structure. */
333  gpgme_error_t  static gpgme_error_t
334  keycache_prepare2 (gpg_keycache_t ctx, const char *kid,  keycache_prepare2 (gpg_keycache_t ctx, const char *kid,
335                     const char *pubring, const char *secring)                     const char *pubring, const char *secring)
336  {  {
# Line 281  keycache_prepare2 (gpg_keycache_t ctx, c Line 355  keycache_prepare2 (gpg_keycache_t ctx, c
355      gpg_iobuf_ioctl (inp, 3, 1, NULL); /* disable cache */      gpg_iobuf_ioctl (inp, 3, 1, NULL); /* disable cache */
356    
357      pkt = (PACKET*)calloc (1, sizeof * pkt);      pkt = (PACKET*)calloc (1, sizeof * pkt);
358        if (!pkt)
359            BUG (0);
360      gpg_init_packet (pkt);      gpg_init_packet (pkt);
361      while (gpg_parse_packet (inp, pkt) != -1) {      while (gpg_parse_packet (inp, pkt) != -1) {
362          if (pkt->pkttype == PKT_PUBLIC_KEY) {          if (pkt->pkttype == PKT_PUBLIC_KEY) {
363              strcpy (keyid, "");              strcpy (keyid, "");
364              key_seen = 1;              key_seen = 1;
365          }          }
   
366          if (pkt->pkttype == PKT_SIGNATURE &&          if (pkt->pkttype == PKT_SIGNATURE &&
367              pkt->pkt.signature->sig_class == 0x1F) {              pkt->pkt.signature->sig_class == 0x1F) {
368              if (pkt->pkt.signature->numrevkeys == 0)              if (pkt->pkt.signature->numrevkeys == 0)
# Line 301  keycache_prepare2 (gpg_keycache_t ctx, c Line 376  keycache_prepare2 (gpg_keycache_t ctx, c
376                  goto next;                  goto next;
377              c->gloflags.has_desig_rev = 1;              c->gloflags.has_desig_rev = 1;
378          }          }
379          if (pkt->pkttype == PKT_SIGNATURE && key_seen == 1 ) {          if (pkt->pkttype == PKT_SIGNATURE && key_seen == 1 && c != NULL) {
380                if (c->sym_prefs) /* only use the prefs from the primary uid. */
381                    goto next;
382              sym_prefs = gpg_parse_sig_subpkt (pkt->pkt.signature->hashed,              sym_prefs = gpg_parse_sig_subpkt (pkt->pkt.signature->hashed,
383                                                SIGSUBPKT_PREF_SYM, &nsym);                                                SIGSUBPKT_PREF_SYM, &nsym);
384              if (!sym_prefs)              if (!sym_prefs)
# Line 316  keycache_prepare2 (gpg_keycache_t ctx, c Line 393  keycache_prepare2 (gpg_keycache_t ctx, c
393              else if (nsym > 0) {              else if (nsym > 0) {
394                  c->sym_prefs = (unsigned char*)calloc (1, nsym+1);                  c->sym_prefs = (unsigned char*)calloc (1, nsym+1);
395                  if (!c->sym_prefs)                  if (!c->sym_prefs)
396                      return gpg_error (GPG_ERR_ENOMEM);                      BUG (0);
397                  memcpy (c->sym_prefs, sym_prefs, nsym);                  memcpy (c->sym_prefs, sym_prefs, nsym);
398              }              }
399          }          }
# Line 358  gpg_keycache_new (gpg_keycache_t *r_ctx) Line 435  gpg_keycache_new (gpg_keycache_t *r_ctx)
435          return gpg_error (GPG_ERR_INV_ARG);          return gpg_error (GPG_ERR_INV_ARG);
436      ctx = (gpg_keycache_t)calloc (1, sizeof *ctx);      ctx = (gpg_keycache_t)calloc (1, sizeof *ctx);
437      if (!ctx)      if (!ctx)
438          return gpg_error (GPG_ERR_ENOMEM);          BUG (0);
439      ctx->secret = 0;      ctx->secret = 0;
440      ctx->pos = 0;      ctx->pos = 0;
441      *r_ctx = ctx;      *r_ctx = ctx;
# Line 379  gpg_keycache_release (gpg_keycache_t ctx Line 456  gpg_keycache_release (gpg_keycache_t ctx
456          c2 = c->next;          c2 = c->next;
457          gpgme_key_release (c->key);          gpgme_key_release (c->key);
458          c->key = NULL;          c->key = NULL;
459            if (c->rev != NULL)
460                gpg_desig_rev_release (c->rev);
461            c->rev = NULL;
462            safe_free (c->pref_keyserver);
463          safe_free (c->sym_prefs);          safe_free (c->sym_prefs);
464          safe_free (c->attrib.d);          safe_free (c->attrib.d);
465          safe_free (c->card_type);          safe_free (c->card_type);
466          free (c);          free_native_uids (&c->uids);
467            safe_free (c);
468      }      }
469      safe_free (ctx);      safe_free (ctx);
470  }  }
# Line 418  gpg_keycache_add_key (gpg_keycache_t ctx Line 500  gpg_keycache_add_key (gpg_keycache_t ctx
500            
501      c = (struct keycache_s*)calloc (1, sizeof *c);      c = (struct keycache_s*)calloc (1, sizeof *c);
502      if (!c)      if (!c)
503          return gpg_error (GPG_ERR_ENOMEM);          BUG (0);
504      c->gloflags.is_protected = 1; /*default: assume protection. */      c->gloflags.is_protected = 1; /*default: assume protection. */
505      c->key = key;      c->key = key;
506      if (!ctx->item)      if (!ctx->item)
# Line 531  gpg_keycache_next_updated_key (gpg_keyca Line 613  gpg_keycache_next_updated_key (gpg_keyca
613      for (c = ctx->item; c; c = c->next) {      for (c = ctx->item; c; c = c->next) {
614          if (c->flags != 0) {          if (c->flags != 0) {
615              *r_status = c->flags;              *r_status = c->flags;
             c->flags = 0;  
616              *r_obj = c;              *r_obj = c;
617                c->flags = 0;
618              return 0;              return 0;
619          }          }
620      }      }
# Line 554  gpg_keycache_update_key (gpg_keycache_t Line 636  gpg_keycache_update_key (gpg_keycache_t
636      err = gpgme_new (&gctx);      err = gpgme_new (&gctx);
637      if (err)      if (err)
638          return err;          return err;
639      gpgme_set_keylist_mode  (gctx, GPGME_KEYLIST_MODE_SIGS);      gpgme_set_keylist_mode  (gctx, GPGME_KEYLIST_MODE_SIGS/*|GPGME_KEYLIST_MODE_SIG_NOTATIONS*/);
640      err = gpgme_get_key (gctx, keyid, &key, is_sec);      err = gpgme_get_key (gctx, keyid, &key, is_sec);
641      gpgme_release (gctx);      gpgme_release (gctx);
642      if (err)      if (err)
# Line 589  gpg_keycache_update_key (gpg_keycache_t Line 671  gpg_keycache_update_key (gpg_keycache_t
671          }          }
672          if (c)          if (c)
673              c->flags = KC_FLAG_ADD;              c->flags = KC_FLAG_ADD;
674    
675        }
676    
677        /* refresh utf8 user ID list. */
678        if (c != NULL) {
679            free_native_uids (&c->uids);
680            keycache_decode_uid (c);
681      }      }
682    
683      return 0;      return 0;
684  }  }
685    
# Line 612  gpg_keycache_delete_key (gpg_keycache_t Line 702  gpg_keycache_delete_key (gpg_keycache_t
702      c = ctx->item;      c = ctx->item;
703      if (c->next == NULL) {      if (c->next == NULL) {
704          gpgme_key_release (itm->key);          gpgme_key_release (itm->key);
705          if (itm)          safe_free (itm);
             free (itm);  
706          ctx->item = NULL;          ctx->item = NULL;
707      }      }
708      else {      else {
709          while (c && c->next != itm)          for (; c != NULL; c = c->next) {
710              c = c->next;              if (c->next == itm)
711                    break;
712            }
713            assert (c != NULL); /* XXX: sometimes access violation. */
714          c->next = c->next->next;          c->next = c->next->next;
715          gpgme_key_release (itm->key);          gpgme_key_release (itm->key);
716          if (itm)          safe_free (itm);
             free (itm);  
717      }      }
718      return 0;      return 0;
719  }  }
# Line 646  gpg_keycache_init (gpg_keycache_t ctx, c Line 737  gpg_keycache_init (gpg_keycache_t ctx, c
737      if (err)      if (err)
738          return err;          return err;
739    
740      gpgme_set_keylist_mode  (c, GPGME_KEYLIST_MODE_SIGS);      /* XXX: GPGME_KEYLIST_MODE_SIG_NOTATIONS causes an internal error! */
741        gpgme_set_keylist_mode  (c, GPGME_KEYLIST_MODE_SIGS/*|GPGME_KEYLIST_MODE_SIG_NOTATIONS*/);
742      err = gpgme_op_keylist_start (c, pattern, secret);      err = gpgme_op_keylist_start (c, pattern, secret);
743      while(!err) {      while(!err) {
744          err = gpgme_op_keylist_next (c, &key);          err = gpgme_op_keylist_next (c, &key);
# Line 659  gpg_keycache_init (gpg_keycache_t ctx, c Line 751  gpg_keycache_init (gpg_keycache_t ctx, c
751      if (gpgme_err_code (err) == GPG_ERR_EOF)      if (gpgme_err_code (err) == GPG_ERR_EOF)
752          err = gpg_error (GPG_ERR_NO_ERROR);          err = gpg_error (GPG_ERR_NO_ERROR);
753      keycache_update_photos (ctx);      keycache_update_photos (ctx);
754        keycache_decode_uids (ctx);
755      /* XXX: make sure the progress dialog is closed. */      /* XXX: make sure the progress dialog is closed. */
756      gpgme_op_keylist_end (c);      gpgme_op_keylist_end (c);
757      gpgme_release (c);      gpgme_release (c);
# Line 696  copy_uid_prefs (const unsigned char *pre Line 789  copy_uid_prefs (const unsigned char *pre
789          pos++;          pos++;
790      p = (unsigned char*)calloc (1, pos+1);      p = (unsigned char*)calloc (1, pos+1);
791      if (!p)      if (!p)
792          abort ();          BUG (0);
793      memcpy (p, prefs, pos);      memcpy (p, prefs, pos);
794      return p;      return p;
795  }  }
# Line 717  gpg_keycache_sync (gpg_keycache_t pub, g Line 810  gpg_keycache_sync (gpg_keycache_t pub, g
810              c_sec->gloflags.divert_to_card = c->gloflags.divert_to_card;              c_sec->gloflags.divert_to_card = c->gloflags.divert_to_card;
811              if (!c->gloflags.divert_to_card)              if (!c->gloflags.divert_to_card)
812                  c->gloflags.divert_to_card = key_divert_to_card (key);                  c->gloflags.divert_to_card = key_divert_to_card (key);
813              c->sym_prefs = copy_uid_prefs (c_sec->sym_prefs);              if (c_sec->sym_prefs)
814                    c->sym_prefs = copy_uid_prefs (c_sec->sym_prefs);
815              c->pubpart = c_sec;              c->pubpart = c_sec;
816              c->pubpart->key = key;              c->pubpart->key = key;
817          }          }
# Line 768  keycache_next_key (gpg_keycache_t ctx, i Line 862  keycache_next_key (gpg_keycache_t ctx, i
862      }      }
863      if (ctx->tmp->flags != 0)      if (ctx->tmp->flags != 0)
864          ctx->tmp->flags = 0; /* reset the 'updated' status. */          ctx->tmp->flags = 0; /* reset the 'updated' status. */
865        /* it might be possible there is no public key. */
866        if (flags && ctx->tmp->pubpart == NULL)
867            flags = 0;
868      *r_key = flags? ctx->tmp->pubpart->key : ctx->tmp->key;      *r_key = flags? ctx->tmp->pubpart->key : ctx->tmp->key;
869      *c = ctx->tmp = ctx->tmp->next;      *c = ctx->tmp;
870        ctx->tmp = ctx->tmp->next;    
871      ctx->pos++;      ctx->pos++;
872    
873      return 0;      return 0;
# Line 783  gpgme_error_t Line 881  gpgme_error_t
881  gpg_keycache_next_key (gpg_keycache_t ctx, int flags, gpgme_key_t *r_key)  gpg_keycache_next_key (gpg_keycache_t ctx, int flags, gpgme_key_t *r_key)
882  {  {
883      struct keycache_s *c=NULL;      struct keycache_s *c=NULL;
884      gpgme_error_t err = 0;      gpgme_error_t err;
885    
886      err = keycache_next_key (ctx, flags, &c, r_key);      err = keycache_next_key (ctx, flags, &c, r_key);
887      return err;      return err;
888  }  }
889    
890    gpgme_error_t
891    gpg_keycache_next_key2 (gpg_keycache_t ctx, int flags,
892                            struct keycache_s **c, gpgme_key_t *r_key)
893    {
894        return keycache_next_key (ctx, flags, c, r_key);
895    }
896    
897    
898    /* Search for a key with the pattern @pattern and mark
899       this key as the default signing key if found.
900       Return value: 0 on success. */
901    gpgme_error_t
902    gpg_keycache_set_default_key (gpg_keycache_t ctx,
903                                  const char *pattern)
904    {
905        gpgme_error_t err;
906        gpgme_key_t key;
907        struct keycache_s *itm;
908    
909        err = gpg_keycache_find_key2 (ctx, pattern, 0, &key, &itm);
910        if (err)
911            return err;
912    
913        if (itm)
914            itm->default_key = 1;
915        return 0;
916    }
917    
918    /* Return the default key from the cache. If no was
919       marked before, NULL is returned in @r_key.
920       Return value: 0 on success. */
921    gpgme_error_t
922    gpg_keycache_get_default_key (gpg_keycache_t ctx,
923                                  gpgme_key_t *r_key)
924    {
925        struct keycache_s *itm;
926    
927        *r_key = NULL;
928        for (itm = ctx->item; itm; itm = itm->next) {
929            if (itm->default_key) {
930                *r_key = itm->key;
931                break;
932            }
933        }
934        if (!*r_key)
935            return gpgme_error (GPG_ERR_NOT_FOUND);
936        return 0;
937    }
938    
939    
940    static gpgme_error_t
941    decode_subpacket (const char *subpkt_data, int *type,
942                      char **out, WORD *outlen)
943    {
944        char tmp[128], *val;
945        char *enc = NULL;
946        size_t pos = 0, i=0;
947    
948        /* example: spk:24:1:21:http%3A//subkeys.pgp.de */
949        *outlen = 0;
950        *out = NULL;
951        
952        if (strncmp (subpkt_data, "spk:", 4))
953            return gpg_error (GPG_ERR_NO_DATA);
954    
955        strncpy (tmp, subpkt_data, 62);
956        val = strtok (tmp, ":");
957        while (val != NULL) {
958            switch (pos++) {
959            case 0:
960                break;
961    
962            case 1:
963                if (type)
964                    *type = atoi (val);
965                break;
966    
967            case 2:
968                break;
969    
970            case 3:
971                *outlen = atoi (val);
972                break;
973    
974            case 4:
975                enc = strdup (val);
976                break;
977            }
978            val = strtok (NULL, ":");
979        }
980        if (!enc)
981            return gpg_error (GPG_ERR_NO_DATA);;
982        *out = (char*)calloc (1, strlen (enc)+1);
983        if (!*out)
984            BUG (0);
985        for (pos = 0; pos < strlen (enc); pos++) {
986            if (enc[pos] == '%' && enc[pos+1] == '%')
987                (*out)[i++] = '%';
988            else if (enc[pos] == '%') {
989                char temp[3];
990                temp[0] = enc[++pos];
991                temp[1] = enc[++pos];
992                temp[2] = 0;
993                (*out)[i++] = (char)strtoul (temp, NULL, 16);
994            }
995            else
996                (*out)[i++] = enc[pos];
997        }
998        (*out)[i] = 0;
999        safe_free (enc);
1000        return 0;
1001    }
1002    
1003    
1004    /* If the attribute given in @attr is not set in the
1005       key cache object, try to update it. */
1006    gpgme_error_t
1007    gpg_keycache_update_attr (struct keycache_s *item,
1008                              int attr, int force)
1009    {
1010        gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
1011        char *val = NULL;
1012        WORD n = 0;    
1013    
1014        switch (attr) {
1015        case KC_ATTR_PREFSYM:
1016            if (!force && item->sym_prefs)
1017                break;
1018            safe_free (item->sym_prefs);
1019            err = gpg_find_key_subpacket (item->key->subkeys->keyid+8, attr, &val);
1020            if (!err && val != NULL)
1021                err = decode_subpacket (val, NULL, (char**)&item->sym_prefs, &n);
1022            break;
1023    
1024        case KC_ATTR_PREFKSERV:
1025            if (!force && item->pref_keyserver)
1026                break;
1027            safe_free (item->pref_keyserver);
1028            err = gpg_find_key_subpacket (item->key->subkeys->keyid+8, attr, &val);
1029            if (!err && val != NULL)
1030                err = decode_subpacket (val, NULL, &item->pref_keyserver, &n);
1031            break;
1032        }
1033        safe_free (val);
1034        return err;
1035    }
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