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assuan-listen.c
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/* assuan-listen.c - Wait for a connection (server)
* Copyright (C) 2001, 2002, 2004, 2009 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/>.
* SPDX-License-Identifier: LGPL-2.1+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <errno.h>
#include "assuan-defs.h"
gpg_error_t
assuan_set_hello_line (assuan_context_t ctx, const char *line)
{
if (!ctx)
return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
if (!line)
{
_assuan_free (ctx, ctx->hello_line);
ctx->hello_line = NULL;
}
else
{
char *buf = _assuan_malloc (ctx, 3 + strlen (line) + 1);
if (!buf)
return _assuan_error (ctx, gpg_err_code_from_syserror ());
if (strchr (line, '\n'))
strcpy (buf, line);
else
{
strcpy (buf, "OK ");
strcpy (buf+3, line);
}
_assuan_free (ctx, ctx->hello_line);
ctx->hello_line = buf;
}
return 0;
}
/**
* assuan_accept:
* @ctx: context
*
* Cancel any existing connection and wait for a connection from a
* client. The initial handshake is performed which may include an
* initial authentication or encryption negotiation.
*
* Return value: 0 on success or an error if the connection could for
* some reason not be established.
**/
gpg_error_t
assuan_accept (assuan_context_t ctx)
{
gpg_error_t rc = 0;
const char *p, *pend;
if (!ctx)
return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
if (ctx->max_accepts != -1)
{
if (ctx->max_accepts-- == 0)
return -1; /* second invocation for pipemode -> terminate */
}
if (ctx->accept_handler)
{
/* FIXME: This should be superfluous, if everything else is
correct. */
ctx->finish_handler (ctx);
rc = ctx->accept_handler (ctx);
if (rc)
return rc;
}
/* Send the hello. */
p = ctx->hello_line;
if (p && (pend = strchr (p, '\n')))
{ /* This is a multi line hello. Send all but the last line as
comments. */
do
{
rc = _assuan_write_line (ctx, "# ", p, pend - p);
if (rc)
return rc;
p = pend + 1;
pend = strchr (p, '\n');
}
while (pend);
rc = _assuan_write_line (ctx, "OK ", p, strlen (p));
}
else if (p)
rc = assuan_write_line (ctx, p);
else
{
static char const okstr[] = "OK Pleased to meet you";
pid_t apid = assuan_get_pid (ctx);
if (apid != ASSUAN_INVALID_PID)
{
char tmpbuf[50];
snprintf (tmpbuf, sizeof tmpbuf, "%s, process %i", okstr, (int)apid);
rc = assuan_write_line (ctx, tmpbuf);
}
else
rc = assuan_write_line (ctx, okstr);
}
if (rc)
return rc;
return 0;
}
assuan_fd_t
assuan_get_input_fd (assuan_context_t ctx)
{
return ctx ? ctx->input_fd : ASSUAN_INVALID_FD;
}
assuan_fd_t
assuan_get_output_fd (assuan_context_t ctx)
{
return ctx ? ctx->output_fd : ASSUAN_INVALID_FD;
}
/* Close the fd descriptor set by the command INPUT FD=n. We handle
this fd inside assuan so that we can do some initial checks */
gpg_error_t
assuan_close_input_fd (assuan_context_t ctx)
{
if (!ctx || ctx->input_fd == ASSUAN_INVALID_FD)
return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
_assuan_close (ctx, ctx->input_fd);
ctx->input_fd = ASSUAN_INVALID_FD;
return 0;
}
/* Close the fd descriptor set by the command OUTPUT FD=n. We handle
this fd inside assuan so that we can do some initial checks */
gpg_error_t
assuan_close_output_fd (assuan_context_t ctx)
{
if (!ctx || ctx->output_fd == ASSUAN_INVALID_FD)
return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
_assuan_close (ctx, ctx->output_fd);
ctx->output_fd = ASSUAN_INVALID_FD;
return 0;
}

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Sun, Feb 23, 7:38 PM (1 d, 9 h)
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