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/* op-support.c - Supporting functions.
* Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
*
* This file is part of GPGME.
*
* GPGME is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GPGME 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <https://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#include "gpgme.h"
#include "context.h"
#include "ops.h"
#include "util.h"
#include "debug.h"
gpgme_error_t
_gpgme_op_data_lookup (gpgme_ctx_t ctx, ctx_op_data_id_t type, void **hook,
int size, void (*cleanup) (void *))
{
struct ctx_op_data *data;
if (!ctx)
return gpg_error (GPG_ERR_INV_VALUE);
data = ctx->op_data;
while (data && data->type != type)
data = data->next;
if (!data)
{
if (size < 0)
{
*hook = NULL;
return 0;
}
data = calloc (1, sizeof (struct ctx_op_data) + size);
if (!data)
return gpg_error_from_syserror ();
data->magic = CTX_OP_DATA_MAGIC;
data->next = ctx->op_data;
data->type = type;
data->cleanup = cleanup;
data->hook = (void *) (((char *) data) + sizeof (struct ctx_op_data));
data->references = 1;
ctx->op_data = data;
}
*hook = data->hook;
return 0;
}
/* type is: 0: asynchronous operation (use global or user event loop).
1: synchronous operation (always use private event loop).
2: asynchronous private operation (use private or user
event loop).
256: Modification flag to suppress the engine reset.
*/
gpgme_error_t
_gpgme_op_reset (gpgme_ctx_t ctx, int type)
{
gpgme_error_t err = 0;
struct gpgme_io_cbs io_cbs;
int no_reset = (type & 256);
int reuse_engine = 0;
type &= 255;
_gpgme_release_result (ctx);
LOCK (ctx->lock);
ctx->canceled = 0;
ctx->redraw_suggested = 0;
UNLOCK (ctx->lock);
if (ctx->engine && no_reset)
reuse_engine = 1;
else if (ctx->engine)
{
/* Attempt to reset an existing engine. */
err = _gpgme_engine_reset (ctx->engine);
if (gpg_err_code (err) == GPG_ERR_NOT_IMPLEMENTED)
{
_gpgme_engine_release (ctx->engine);
ctx->engine = NULL;
}
}
if (!ctx->engine)
{
gpgme_engine_info_t info;
info = ctx->engine_info;
while (info && info->protocol != ctx->protocol)
info = info->next;
if (!info)
return gpg_error (GPG_ERR_UNSUPPORTED_PROTOCOL);
/* Create an engine object. */
err = _gpgme_engine_new (info, &ctx->engine);
if (err)
return err;
}
if (!reuse_engine)
{
err = 0;
#ifdef LC_CTYPE
err = _gpgme_engine_set_locale (ctx->engine, LC_CTYPE, ctx->lc_ctype);
#endif
#ifdef LC_MESSAGES
if (!err)
err = _gpgme_engine_set_locale (ctx->engine,
LC_MESSAGES, ctx->lc_messages);
#endif
if (gpg_err_code (err) == GPG_ERR_NOT_IMPLEMENTED)
err = 0;
_gpgme_engine_set_engine_flags (ctx->engine, ctx);
if (!err)
{
err = _gpgme_engine_set_pinentry_mode (ctx->engine,
ctx->pinentry_mode);
if (gpg_err_code (err) == GPG_ERR_NOT_IMPLEMENTED)
err = 0;
}
if (!err && ctx->status_cb && ctx->full_status)
{
_gpgme_engine_set_status_cb (ctx->engine,
ctx->status_cb, ctx->status_cb_value);
}
if (err)
{
_gpgme_engine_release (ctx->engine);
ctx->engine = NULL;
return err;
}
}
if (ctx->sub_protocol != GPGME_PROTOCOL_DEFAULT)
{
err = _gpgme_engine_set_protocol (ctx->engine, ctx->sub_protocol);
if (err)
return err;
}
if (type == 1 || (type == 2 && !ctx->io_cbs.add))
{
/* Use private event loop. */
io_cbs.add = _gpgme_add_io_cb;
io_cbs.add_priv = ctx;
io_cbs.remove = _gpgme_remove_io_cb;
io_cbs.event = _gpgme_wait_private_event_cb;
io_cbs.event_priv = ctx;
}
else if (! ctx->io_cbs.add)
{
/* Use global event loop. */
io_cbs.add = _gpgme_add_io_cb;
io_cbs.add_priv = ctx;
io_cbs.remove = _gpgme_remove_io_cb;
io_cbs.event = _gpgme_wait_global_event_cb;
io_cbs.event_priv = ctx;
}
else
{
/* Use user event loop. */
io_cbs.add = _gpgme_wait_user_add_io_cb;
io_cbs.add_priv = ctx;
io_cbs.remove = _gpgme_wait_user_remove_io_cb;
io_cbs.event = _gpgme_wait_user_event_cb;
io_cbs.event_priv = ctx;
}
_gpgme_engine_set_io_cbs (ctx->engine, &io_cbs);
return err;
}
/* Parse the INV_RECP or INV_SNDR status line in ARGS and return the
result in KEY. If KC_FPR (from the KEY_CONSIDERED status line) is
not NULL take the KC_FLAGS in account. */
gpgme_error_t
_gpgme_parse_inv_recp (char *args, int for_signing,
const char *kc_fpr, unsigned int kc_flags,
gpgme_invalid_key_t *key)
{
gpgme_invalid_key_t inv_key;
char *tail;
long int reason;
(void)for_signing;
inv_key = calloc (1, sizeof (*inv_key));
if (!inv_key)
return gpg_error_from_syserror ();
inv_key->next = NULL;
gpg_err_set_errno (0);
reason = strtol (args, &tail, 0);
if (errno || args == tail || (*tail && *tail != ' '))
{
/* The crypto backend does not behave. */
free (inv_key);
return trace_gpg_error (GPG_ERR_INV_ENGINE);
}
switch (reason)
{
case 0:
if (kc_fpr && (kc_flags & 2))
inv_key->reason = gpg_error (GPG_ERR_SUBKEYS_EXP_OR_REV);
else
inv_key->reason = gpg_error (GPG_ERR_GENERAL);
break;
case 1:
inv_key->reason = gpg_error (GPG_ERR_NO_PUBKEY);
break;
case 2:
inv_key->reason = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
break;
case 3:
inv_key->reason = gpg_error (GPG_ERR_WRONG_KEY_USAGE);
break;
case 4:
inv_key->reason = gpg_error (GPG_ERR_CERT_REVOKED);
break;
case 5:
inv_key->reason = gpg_error (GPG_ERR_CERT_EXPIRED);
break;
case 6:
inv_key->reason = gpg_error (GPG_ERR_NO_CRL_KNOWN);
break;
case 7:
inv_key->reason = gpg_error (GPG_ERR_CRL_TOO_OLD);
break;
case 8:
inv_key->reason = gpg_error (GPG_ERR_NO_POLICY_MATCH);
break;
case 9:
inv_key->reason = gpg_error (GPG_ERR_NO_SECKEY);
break;
case 10:
inv_key->reason = gpg_error (GPG_ERR_PUBKEY_NOT_TRUSTED);
break;
case 11:
inv_key->reason = gpg_error (GPG_ERR_MISSING_CERT);
break;
case 12:
inv_key->reason = gpg_error (GPG_ERR_MISSING_ISSUER_CERT);
break;
case 13:
inv_key->reason = gpg_error (252); /*GPG_ERR_KEY_DISABLED*/
break;
case 14:
inv_key->reason = gpg_error (GPG_ERR_INV_USER_ID);
break;
default:
inv_key->reason = gpg_error (GPG_ERR_GENERAL);
break;
}
while (*tail && *tail == ' ')
tail++;
if (*tail)
{
inv_key->fpr = strdup (tail);
if (!inv_key->fpr)
{
free (inv_key);
return gpg_error_from_syserror ();
}
}
*key = inv_key;
return 0;
}
/* Parse a KEY_CONSIDERED status line in ARGS and store the
* fingerprint and the flags at R_FPR and R_FLAGS. The caller must
* free the value at R_FPR on success. */
gpgme_error_t
_gpgme_parse_key_considered (const char *args,
char **r_fpr, unsigned int *r_flags)
{
char *pend;
size_t n;
*r_fpr = NULL;
pend = strchr (args, ' ');
if (!pend || pend == args)
return trace_gpg_error (GPG_ERR_INV_ENGINE); /* Bogus status line. */
n = pend - args;
*r_fpr = malloc (n + 1);
if (!*r_fpr)
return gpg_error_from_syserror ();
memcpy (*r_fpr, args, n);
(*r_fpr)[n] = 0;
args = pend + 1;
gpg_err_set_errno (0);
*r_flags = strtoul (args, &pend, 0);
if (errno || args == pend || (*pend && *pend != ' '))
{
free (*r_fpr);
*r_fpr = NULL;
return trace_gpg_error (GPG_ERR_INV_ENGINE);
}
return 0;
}
/* Parse the PLAINTEXT status line in ARGS and return the result in
FILENAMEP. */
gpgme_error_t
_gpgme_parse_plaintext (char *args, char **filenamep, int *r_mime)
{
char *tail;
while (*args == ' ')
args++;
if (*args == '\0')
return 0;
/* First argument is file type (a one byte uppercase hex value). */
if (args[0] == '6' && args[1] == 'D')
*r_mime = 1;
while (*args != ' ' && *args != '\0')
args++;
while (*args == ' ')
args++;
if (*args == '\0')
return 0;
/* Second argument is the timestamp. */
while (*args != ' ' && *args != '\0')
args++;
while (*args == ' ')
args++;
if (*args == '\0')
return 0;
tail = args;
while (*tail != ' ' && *tail != '\0')
tail++;
*tail = '\0';
if (filenamep && *args != '\0')
{
char *filename = strdup (args);
if (!filename)
return gpg_error_from_syserror ();
*filenamep = filename;
}
return 0;
}
/* Parse a FAILURE status line and return the error code. ARGS is
* modified to contain the location part. Note that for now we ignore
* failure codes with a location of gpg-exit; they are too trouble
* some. Instead we should eventually record that error in the
* context and provide a function to return a fuller error
* description; this could then also show the location of the error
* (e.g. "option- parser") to make it easier for the user to detect
* the actual error. */
gpgme_error_t
_gpgme_parse_failure (char *args)
{
char *where, *which;
if (!strncmp (args, "gpg-exit", 8))
return 0;
where = strchr (args, ' ');
if (!where)
return trace_gpg_error (GPG_ERR_INV_ENGINE);
*where = '\0';
which = where + 1;
where = strchr (which, ' ');
if (where)
*where = '\0';
return atoi (which);
}

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