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/*
callbacks.cpp - callback targets for internal use:
Copyright (C) 2003,2004 Klarälvdalens Datakonsult AB
This file is part of GPGME++.
GPGME++ 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.
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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with GPGME++; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config-gpgme++.h>
#include "callbacks.h"
#include "util.h"
#include <interfaces/progressprovider.h>
#include <interfaces/passphraseprovider.h>
#include <interfaces/dataprovider.h>
#include <error.h>
#include <gpgme.h>
#include <gpg-error.h>
#include <cassert>
#include <cerrno>
#include <cstring>
#include <unistd.h>
#include <stdlib.h>
#ifndef HAVE_GPGME_SSIZE_T
# define gpgme_ssize_t ssize_t
#endif
#ifndef HAVE_GPGME_OFF_T
# define gpgme_off_t off_t
#endif
static inline gpgme_error_t make_err_from_syserror()
{
#ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS
return gpgme_error_from_syserror();
#else
return gpg_error_from_syserror();
#endif
}
using GpgME::ProgressProvider;
using GpgME::PassphraseProvider;
using GpgME::DataProvider;
void progress_callback(void *opaque, const char *what,
int type, int current, int total)
{
ProgressProvider *provider = static_cast<ProgressProvider *>(opaque);
if (provider) {
provider->showProgress(what, type, current, total);
}
}
/* To avoid that a compiler optimizes certain memset calls away, these
macros may be used instead. */
#define wipememory2(_ptr,_set,_len) do { \
volatile char *_vptr=(volatile char *)(_ptr); \
size_t _vlen=(_len); \
while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
} while(0)
#define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
gpgme_error_t passphrase_callback(void *opaque, const char *uid_hint, const char *desc,
int prev_was_bad, int fd)
{
PassphraseProvider *provider = static_cast<PassphraseProvider *>(opaque);
bool canceled = false;
gpgme_error_t err = GPG_ERR_NO_ERROR;
char *passphrase = provider ? provider->getPassphrase(uid_hint, desc, prev_was_bad, canceled) : 0 ;
if (canceled) {
err = make_error(GPG_ERR_CANCELED);
} else {
if (passphrase && *passphrase) {
size_t passphrase_length = std::strlen(passphrase);
size_t written = 0;
do {
#ifdef HAVE_GPGME_IO_READWRITE
ssize_t now_written = gpgme_io_write(fd, passphrase + written, passphrase_length - written);
#else
ssize_t now_written = write(fd, passphrase + written, passphrase_length - written);
#endif
if (now_written < 0) {
err = make_err_from_syserror();
break;
}
written += now_written;
} while (written < passphrase_length);
}
}
if (passphrase && *passphrase) {
wipememory(passphrase, std::strlen(passphrase));
}
free(passphrase);
#ifdef HAVE_GPGME_IO_READWRITE
gpgme_io_write(fd, "\n", 1);
#else
write(fd, "\n", 1);
#endif
return err;
}
static gpgme_ssize_t
data_read_callback(void *opaque, void *buf, size_t buflen)
{
DataProvider *provider = static_cast<DataProvider *>(opaque);
if (!provider) {
#ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS
gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#else
gpg_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#endif
return -1;
}
return (gpgme_ssize_t)provider->read(buf, buflen);
}
static gpgme_ssize_t
data_write_callback(void *opaque, const void *buf, size_t buflen)
{
DataProvider *provider = static_cast<DataProvider *>(opaque);
if (!provider) {
#ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS
gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#else
gpg_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#endif
return -1;
}
return (gpgme_ssize_t)provider->write(buf, buflen);
}
static gpgme_off_t
data_seek_callback(void *opaque, gpgme_off_t offset, int whence)
{
DataProvider *provider = static_cast<DataProvider *>(opaque);
if (!provider) {
#ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS
gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#else
gpg_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#endif
return -1;
}
if (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) {
#ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS
gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#else
gpg_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
#endif
return -1;
}
return provider->seek((off_t)offset, whence);
}
static void data_release_callback(void *opaque)
{
DataProvider *provider = static_cast<DataProvider *>(opaque);
if (provider) {
provider->release();
}
}
const gpgme_data_cbs GpgME::data_provider_callbacks = {
&data_read_callback,
&data_write_callback,
&data_seek_callback,
&data_release_callback
};
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