mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
281 lines
8.2 KiB
C
281 lines
8.2 KiB
C
/* assuan-client.c - client functions
|
||
* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
|
||
* Copyright (C) 2005 Free Software Foundation, Inc.
|
||
*
|
||
* This file is part of Assuan.
|
||
*
|
||
* Assuan 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.
|
||
*
|
||
* Assuan 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 <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
/* Please note that this is a stripped down and modified version of
|
||
the orginal Assuan code from libassuan. */
|
||
|
||
#include <config.h>
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <errno.h>
|
||
#include <unistd.h>
|
||
#include <assert.h>
|
||
#include <string.h>
|
||
|
||
#include "assuan-defs.h"
|
||
|
||
#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \
|
||
*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
|
||
#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
|
||
|
||
|
||
assuan_error_t
|
||
_assuan_read_from_server (assuan_context_t ctx, int *okay, int *off)
|
||
{
|
||
char *line;
|
||
int linelen;
|
||
assuan_error_t rc;
|
||
|
||
*okay = 0;
|
||
*off = 0;
|
||
do
|
||
{
|
||
rc = _assuan_read_line (ctx);
|
||
if (rc)
|
||
return rc;
|
||
line = ctx->inbound.line;
|
||
linelen = ctx->inbound.linelen;
|
||
}
|
||
while (*line == '#' || !linelen);
|
||
|
||
if (linelen >= 1
|
||
&& line[0] == 'D' && line[1] == ' ')
|
||
{
|
||
*okay = 2; /* data line */
|
||
*off = 2;
|
||
}
|
||
else if (linelen >= 1
|
||
&& line[0] == 'S'
|
||
&& (line[1] == '\0' || line[1] == ' '))
|
||
{
|
||
*okay = 4;
|
||
*off = 1;
|
||
while (line[*off] == ' ')
|
||
++*off;
|
||
}
|
||
else if (linelen >= 2
|
||
&& line[0] == 'O' && line[1] == 'K'
|
||
&& (line[2] == '\0' || line[2] == ' '))
|
||
{
|
||
*okay = 1;
|
||
*off = 2;
|
||
while (line[*off] == ' ')
|
||
++*off;
|
||
}
|
||
else if (linelen >= 3
|
||
&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
|
||
&& (line[3] == '\0' || line[3] == ' '))
|
||
{
|
||
*okay = 0;
|
||
*off = 3;
|
||
while (line[*off] == ' ')
|
||
++*off;
|
||
}
|
||
else if (linelen >= 7
|
||
&& line[0] == 'I' && line[1] == 'N' && line[2] == 'Q'
|
||
&& line[3] == 'U' && line[4] == 'I' && line[5] == 'R'
|
||
&& line[6] == 'E'
|
||
&& (line[7] == '\0' || line[7] == ' '))
|
||
{
|
||
*okay = 3;
|
||
*off = 7;
|
||
while (line[*off] == ' ')
|
||
++*off;
|
||
}
|
||
else if (linelen >= 3
|
||
&& line[0] == 'E' && line[1] == 'N' && line[2] == 'D'
|
||
&& (line[3] == '\0' || line[3] == ' '))
|
||
{
|
||
*okay = 5; /* end line */
|
||
*off = 3;
|
||
}
|
||
else
|
||
rc = ASSUAN_Invalid_Response;
|
||
return rc;
|
||
}
|
||
|
||
|
||
|
||
assuan_error_t
|
||
assuan_transact (assuan_context_t ctx,
|
||
const char *command,
|
||
assuan_error_t (*data_cb)(void *, const void *, size_t),
|
||
void *data_cb_arg,
|
||
assuan_error_t (*inquire_cb)(void*, const char *),
|
||
void *inquire_cb_arg,
|
||
assuan_error_t (*status_cb)(void*, const char *),
|
||
void *status_cb_arg)
|
||
{
|
||
return assuan_transact2 (ctx, command,
|
||
data_cb, data_cb_arg,
|
||
inquire_cb, inquire_cb_arg,
|
||
status_cb, status_cb_arg,
|
||
NULL, NULL);
|
||
}
|
||
|
||
|
||
/**
|
||
* assuan_transact2:
|
||
* @ctx: The Assuan context
|
||
* @command: Coimmand line to be send to server
|
||
* @data_cb: Callback function for data lines
|
||
* @data_cb_arg: first argument passed to @data_cb
|
||
* @inquire_cb: Callback function for a inquire response
|
||
* @inquire_cb_arg: first argument passed to @inquire_cb
|
||
* @status_cb: Callback function for a status response
|
||
* @status_cb_arg: first argument passed to @status_cb
|
||
* @okay_cb: Callback function for the final OK response
|
||
* @okay_cb_arg: first argument passed to @okay_cb
|
||
*
|
||
* FIXME: Write documentation
|
||
*
|
||
* Return value: 0 on success or error code. The error code may be
|
||
* the one one returned by the server in error lines or from the
|
||
* callback functions.
|
||
**/
|
||
assuan_error_t
|
||
assuan_transact2 (assuan_context_t ctx,
|
||
const char *command,
|
||
assuan_error_t (*data_cb)(void *, const void *, size_t),
|
||
void *data_cb_arg,
|
||
assuan_error_t (*inquire_cb)(void*, const char *),
|
||
void *inquire_cb_arg,
|
||
assuan_error_t (*status_cb)(void*, const char *),
|
||
void *status_cb_arg,
|
||
assuan_error_t (*okay_cb)(void*, const char *),
|
||
void *okay_cb_arg)
|
||
{
|
||
int rc, okay, off;
|
||
unsigned char *line;
|
||
int linelen;
|
||
|
||
rc = assuan_write_line (ctx, command);
|
||
if (rc)
|
||
return rc;
|
||
|
||
if (*command == '#' || !*command)
|
||
return 0; /* Don't expect a response for a comment line. */
|
||
|
||
again:
|
||
rc = _assuan_read_from_server (ctx, &okay, &off);
|
||
if (rc)
|
||
return rc; /* error reading from server */
|
||
|
||
line = ctx->inbound.line + off;
|
||
linelen = ctx->inbound.linelen - off;
|
||
|
||
if (!okay)
|
||
{
|
||
rc = atoi (line);
|
||
if (rc < 100)
|
||
rc = ASSUAN_Server_Fault;
|
||
}
|
||
else if (okay == 1) /* Received OK. */
|
||
{
|
||
if (okay_cb)
|
||
{
|
||
rc = okay_cb (okay_cb_arg, line);
|
||
/* We better wipe out the buffer after processing it. This
|
||
is no real guarantee that it won't get swapped out but at
|
||
least for the standard cases we can make sure that a
|
||
passphrase returned with the OK line is rendered
|
||
unreadable. In fact the current Assuan interface suffers
|
||
from the problem that it is not possible to do assuan I/O
|
||
through secure memory. There is no easy solution given
|
||
the current implementation but we need to address it
|
||
sooner or later. The problem was introduced with
|
||
gpg-agent's GET_PASPHRASE command but it might also make
|
||
sense to have a way to convey sessions keys through
|
||
secured memory. Note that the old implementation in gpg
|
||
for accessing the passphrase in fact used secure memory
|
||
but had the drawback of using a limited and not fully
|
||
conforming Assuan implementation - given that pinentry
|
||
and gpg-agent neither use secured memory for Assuan I/O,
|
||
it is negligible to drop the old implementation in gpg's
|
||
passphrase.c and use the wipememory workaround here. */
|
||
memset (line, 0, strlen (line));
|
||
}
|
||
}
|
||
else if (okay == 2)
|
||
{
|
||
if (!data_cb)
|
||
rc = ASSUAN_No_Data_Callback;
|
||
else
|
||
{
|
||
unsigned char *s, *d;
|
||
|
||
for (s=d=line; linelen; linelen--)
|
||
{
|
||
if (*s == '%' && linelen > 2)
|
||
{ /* handle escaping */
|
||
s++;
|
||
*d++ = xtoi_2 (s);
|
||
s += 2;
|
||
linelen -= 2;
|
||
}
|
||
else
|
||
*d++ = *s++;
|
||
}
|
||
*d = 0; /* add a hidden string terminator */
|
||
rc = data_cb (data_cb_arg, line, d - line);
|
||
if (!rc)
|
||
goto again;
|
||
}
|
||
}
|
||
else if (okay == 3)
|
||
{
|
||
if (!inquire_cb)
|
||
{
|
||
assuan_write_line (ctx, "END"); /* get out of inquire mode */
|
||
_assuan_read_from_server (ctx, &okay, &off); /* dummy read */
|
||
rc = ASSUAN_No_Inquire_Callback;
|
||
}
|
||
else
|
||
{
|
||
rc = inquire_cb (inquire_cb_arg, line);
|
||
if (!rc)
|
||
rc = assuan_send_data (ctx, NULL, 0); /* flush and send END */
|
||
if (!rc)
|
||
goto again;
|
||
}
|
||
}
|
||
else if (okay == 4)
|
||
{
|
||
if (status_cb)
|
||
rc = status_cb (status_cb_arg, line);
|
||
if (!rc)
|
||
goto again;
|
||
}
|
||
else if (okay == 5)
|
||
{
|
||
if (!data_cb)
|
||
rc = ASSUAN_No_Data_Callback;
|
||
else
|
||
{
|
||
rc = data_cb (data_cb_arg, NULL, 0);
|
||
if (!rc)
|
||
goto again;
|
||
}
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|