1 | /* |
2 | callbacks.cpp - callback targets for internal use: |
3 | Copyright (C) 2003,2004 Klarälvdalens Datakonsult AB |
4 | |
5 | This file is part of GPGME++. |
6 | |
7 | GPGME++ is free software; you can redistribute it and/or |
8 | modify it under the terms of the GNU Library General Public |
9 | License as published by the Free Software Foundation; either |
10 | version 2 of the License, or (at your option) any later version. |
11 | |
12 | GPGME++ is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU Library General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU Library General Public License |
18 | along with GPGME++; see the file COPYING.LIB. If not, write to the |
19 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. |
21 | */ |
22 | |
23 | #include <gpgme++/config-gpgme++.h> |
24 | |
25 | #include "callbacks.h" |
26 | #include "util.h" |
27 | |
28 | #include <gpgme++/interfaces/progressprovider.h> |
29 | #include <gpgme++/interfaces/passphraseprovider.h> |
30 | #include <gpgme++/interfaces/dataprovider.h> |
31 | #include <gpgme++/error.h> |
32 | |
33 | #include <gpgme.h> |
34 | #include <gpg-error.h> |
35 | |
36 | #include <cassert> |
37 | #include <cerrno> |
38 | #include <cstring> |
39 | #include <unistd.h> |
40 | #include <stdlib.h> |
41 | |
42 | #ifndef HAVE_GPGME_SSIZE_T |
43 | # define gpgme_ssize_t ssize_t |
44 | #endif |
45 | |
46 | #ifndef HAVE_GPGME_OFF_T |
47 | # define gpgme_off_t off_t |
48 | #endif |
49 | |
50 | |
51 | static inline gpgme_error_t make_err_from_syserror() { |
52 | #ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS |
53 | return gpgme_error_from_syserror(); |
54 | #else |
55 | return gpg_error_from_syserror(); |
56 | #endif |
57 | } |
58 | |
59 | using GpgME::ProgressProvider; |
60 | using GpgME::PassphraseProvider; |
61 | using GpgME::DataProvider; |
62 | |
63 | void progress_callback( void * opaque, const char * what, |
64 | int type, int current, int total ) { |
65 | ProgressProvider * provider = static_cast<ProgressProvider*>( opaque ); |
66 | if ( provider ) { |
67 | provider->showProgress( what, type, current, total ); |
68 | } |
69 | } |
70 | |
71 | /* To avoid that a compiler optimizes certain memset calls away, these |
72 | macros may be used instead. */ |
73 | #define wipememory2(_ptr,_set,_len) do { \ |
74 | volatile char *_vptr=(volatile char *)(_ptr); \ |
75 | size_t _vlen=(_len); \ |
76 | while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \ |
77 | } while(0) |
78 | #define wipememory(_ptr,_len) wipememory2(_ptr,0,_len) |
79 | |
80 | gpgme_error_t passphrase_callback( void * opaque, const char * uid_hint, const char * desc, |
81 | int prev_was_bad, int fd ) { |
82 | PassphraseProvider * provider = static_cast<PassphraseProvider*>( opaque ); |
83 | bool canceled = false; |
84 | gpgme_error_t err = GPG_ERR_NO_ERROR; |
85 | char * passphrase = provider ? provider->getPassphrase( uid_hint, desc, prev_was_bad, canceled ) : 0 ; |
86 | if ( canceled ) { |
87 | err = make_error( GPG_ERR_CANCELED ); |
88 | } else { |
89 | if ( passphrase && *passphrase ) { |
90 | size_t passphrase_length = std::strlen( passphrase ); |
91 | size_t written = 0; |
92 | do { |
93 | #ifdef HAVE_GPGME_IO_READWRITE |
94 | ssize_t now_written = gpgme_io_write( fd, passphrase + written, passphrase_length - written ); |
95 | #else |
96 | ssize_t now_written = write( fd, passphrase + written, passphrase_length - written ); |
97 | #endif |
98 | if ( now_written < 0 ) { |
99 | err = make_err_from_syserror(); |
100 | break; |
101 | } |
102 | written += now_written; |
103 | } while ( written < passphrase_length ); |
104 | } |
105 | } |
106 | |
107 | if ( passphrase && *passphrase ) { |
108 | wipememory( passphrase, std::strlen( passphrase ) ); |
109 | } |
110 | free( passphrase ); |
111 | #ifdef HAVE_GPGME_IO_READWRITE |
112 | gpgme_io_write( fd, "\n" , 1 ); |
113 | #else |
114 | write( fd, "\n" , 1 ); |
115 | #endif |
116 | return err; |
117 | } |
118 | |
119 | |
120 | |
121 | static gpgme_ssize_t |
122 | data_read_callback( void * opaque, void * buf, size_t buflen ) { |
123 | DataProvider * provider = static_cast<DataProvider*>( opaque ); |
124 | if ( !provider ) { |
125 | #ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS |
126 | gpgme_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
127 | #else |
128 | gpg_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
129 | #endif |
130 | return -1; |
131 | } |
132 | return (gpgme_ssize_t)provider->read( buf, buflen ); |
133 | } |
134 | |
135 | static gpgme_ssize_t |
136 | data_write_callback( void * opaque, const void * buf, size_t buflen ) { |
137 | DataProvider * provider = static_cast<DataProvider*>( opaque ); |
138 | if ( !provider ) { |
139 | #ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS |
140 | gpgme_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
141 | #else |
142 | gpg_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
143 | #endif |
144 | return -1; |
145 | } |
146 | return (gpgme_ssize_t)provider->write( buf, buflen ); |
147 | } |
148 | |
149 | static gpgme_off_t |
150 | data_seek_callback( void * opaque, gpgme_off_t offset, int whence ) { |
151 | DataProvider * provider = static_cast<DataProvider*>( opaque ); |
152 | if ( !provider ) { |
153 | #ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS |
154 | gpgme_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
155 | #else |
156 | gpg_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
157 | #endif |
158 | return -1; |
159 | } |
160 | if ( whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END ) { |
161 | #ifdef HAVE_GPGME_GPG_ERROR_WRAPPERS |
162 | gpgme_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
163 | #else |
164 | gpg_err_set_errno( gpgme_err_code_to_errno( GPG_ERR_EINVAL ) ); |
165 | #endif |
166 | return -1; |
167 | } |
168 | return provider->seek( (off_t)offset, whence ); |
169 | } |
170 | |
171 | static void data_release_callback( void * opaque ) { |
172 | DataProvider * provider = static_cast<DataProvider*>( opaque ); |
173 | if ( provider ) { |
174 | provider->release(); |
175 | } |
176 | } |
177 | |
178 | gpgme_data_cbs GpgME::data_provider_callbacks = { |
179 | &data_read_callback, |
180 | &data_write_callback, |
181 | &data_seek_callback, |
182 | &data_release_callback |
183 | }; |
184 | |
185 | |