summaryrefslogtreecommitdiff
path: root/lang/cpp/src/callbacks.cpp
blob: 4b4dd80605da8056a20880f254f4845c1315d6f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
  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 "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>

static inline gpgme_error_t make_err_from_syserror()
{
    return gpgme_error_from_syserror();
}

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 {
                ssize_t now_written = gpgme_io_write(fd, passphrase + written, passphrase_length - written);
                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);
    gpgme_io_write(fd, "\n", 1);
    return err;
}

static gpgme_ssize_t
data_read_callback(void *opaque, void *buf, size_t buflen)
{
    DataProvider *provider = static_cast<DataProvider *>(opaque);
    if (!provider) {
        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
        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) {
        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
        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) {
        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
        return -1;
    }
    if (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) {
        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
        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
};