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gnupg/assuan/assuan-client.c
Werner Koch ac88a4e804 assuan-connect.c (assuan_pipe_connect): Add more error reporting.
assuan-client.c: New.
assuan-inquire.c: New.
assuan-handler.c (process_request): Check for nested invocations.
2001-12-05 23:45:01 +00:00

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/* assuan-client.c - client functions
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <assert.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))
static AssuanError
read_from_server (ASSUAN_CONTEXT ctx, int *okay, int *off)
{
char *line;
int linelen;
AssuanError 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 >= 2
&& line[0] == 'O' && line[1] == 'K'
&& (line[2] == '\0' || line[2] == ' '))
{
*okay = 1;
*off = 2;
}
else if (linelen >= 3
&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
&& (line[3] == '\0' || line[3] == ' '))
{
*okay = 0;
*off = 3;
}
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;
}
else
rc = ASSUAN_Invalid_Response;
return rc;
}
/**
* assuan_transact:
* @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
*
* 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.
**/
AssuanError
assuan_transact (ASSUAN_CONTEXT ctx,
const char *command,
AssuanError (*data_cb)(void *, const void *, size_t),
void *data_cb_arg,
AssuanError (*inquire_cb)(void*, const char *),
void *inquire_cb_arg)
{
int rc, okay, off;
unsigned char *line;
int linelen;
rc = _assuan_write_line (ctx, command);
if (rc)
return rc;
again:
rc = 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 == 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 */
read_from_server (ctx, &okay, &off); /* dummy read the response */
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;
}
}
return rc;
}