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assuan-client.c
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/* assuan-client.c - client functions
* Copyright (C) 2001, 2002, 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* 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))
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_error (ASSUAN_Invalid_Response);
return rc;
}
/**
* assuan_transact:
* @ctx: The Assuan context
* @command: Command line to be send to the 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
*
* 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. Take care: When a callback returns an error
* this function returns immediately with an error and thus the caller
* will altter return an Assuan error (write erro in most cases).
**/
assuan_error_t
assuan_transact (assuan_context_t ctx,
const char *command,
int (*data_cb)(void *, const void *, size_t),
void *data_cb_arg,
int (*inquire_cb)(void*, const char *),
void *inquire_cb_arg,
int (*status_cb)(void*, const char *),
void *status_cb_arg)
{
assuan_error_t rc;
int okay, off;
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 > 0 && rc < 100)
rc = _assuan_error (ASSUAN_Server_Fault);
else if (rc > 0 && rc <= 128)
rc = _assuan_error (rc);
}
else if (okay == 2)
{
if (!data_cb)
rc = _assuan_error (ASSUAN_No_Data_Callback);
else
{
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_error (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_error (ASSUAN_No_Data_Callback);
else
{
rc = data_cb (data_cb_arg, NULL, 0);
if (!rc)
goto again;
}
}
return rc;
}

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