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/* assuan-socket-server.c - Assuan socket based server
* Copyright (C) 2002, 2007 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/>.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#ifdef HAVE_W32_SYSTEM
# include <windows.h>
# if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
# elif HAVE_WS2TCPIP_H
# include <ws2tcpip.h>
# endif
#else
# include <sys/socket.h>
# include <sys/un.h>
#endif
#include "assuan-defs.h"
static struct assuan_io io = { _assuan_simple_read, _assuan_simple_write,
NULL, NULL };
static int
accept_connection_bottom (assuan_context_t ctx)
{
assuan_fd_t fd = ctx->connected_fd;
ctx->peercred.valid = 0;
#ifdef HAVE_SO_PEERCRED
{
struct ucred cr;
socklen_t cl = sizeof cr;
if ( !getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cl))
{
ctx->peercred.pid = cr.pid;
ctx->peercred.uid = cr.uid;
ctx->peercred.gid = cr.gid;
ctx->peercred.valid = 1;
/* This overrides any already set PID if the function returns
a valid one. */
if (cr.pid != (pid_t)-1 && cr.pid)
ctx->pid = cr.pid;
}
}
#endif
ctx->inbound.fd = fd;
ctx->inbound.eof = 0;
ctx->inbound.linelen = 0;
ctx->inbound.attic.linelen = 0;
ctx->inbound.attic.pending = 0;
ctx->outbound.fd = fd;
ctx->outbound.data.linelen = 0;
ctx->outbound.data.error = 0;
ctx->confidential = 0;
return 0;
}
static int
accept_connection (assuan_context_t ctx)
{
assuan_fd_t fd;
struct sockaddr_un clnt_addr;
socklen_t len = sizeof clnt_addr;
fd = SOCKET2HANDLE(accept (HANDLE2SOCKET(ctx->listen_fd),
(struct sockaddr*)&clnt_addr, &len ));
if (fd == ASSUAN_INVALID_FD)
{
ctx->os_errno = errno;
return _assuan_error (ASSUAN_Accept_Failed);
}
if (_assuan_sock_check_nonce (fd, &ctx->listen_nonce))
{
_assuan_close (fd);
ctx->os_errno = EACCES;
return _assuan_error (ASSUAN_Accept_Failed);
}
ctx->connected_fd = fd;
return accept_connection_bottom (ctx);
}
static int
finish_connection (assuan_context_t ctx)
{
if (ctx->inbound.fd != ASSUAN_INVALID_FD)
{
_assuan_close (ctx->inbound.fd);
}
ctx->inbound.fd = ASSUAN_INVALID_FD;
ctx->outbound.fd = ASSUAN_INVALID_FD;
return 0;
}
static void
deinit_socket_server (assuan_context_t ctx)
{
finish_connection (ctx);
}
/* Initialize a server for the socket LISTEN_FD which has already be
put into listen mode */
int
assuan_init_socket_server (assuan_context_t *r_ctx, assuan_fd_t listen_fd)
{
return assuan_init_socket_server_ext (r_ctx, listen_fd, 0);
}
/* Initialize a server using the already accepted socket FD. This
function is deprecated. */
int
assuan_init_connected_socket_server (assuan_context_t *r_ctx, assuan_fd_t fd)
{
return assuan_init_socket_server_ext (r_ctx, fd, 2);
}
/*
Flag bits: 0 - use sendmsg/recvmsg to allow descriptor passing
1 - FD has already been accepted.
*/
int
assuan_init_socket_server_ext (assuan_context_t *r_ctx, assuan_fd_t fd,
unsigned int flags)
{
assuan_context_t ctx;
int rc;
*r_ctx = NULL;
ctx = xtrycalloc (1, sizeof *ctx);
if (!ctx)
return _assuan_error (ASSUAN_Out_Of_Core);
ctx->is_server = 1;
if ((flags & 2))
ctx->pipe_mode = 1; /* We want a second accept to indicate EOF. */
ctx->input_fd = ASSUAN_INVALID_FD;
ctx->output_fd = ASSUAN_INVALID_FD;
ctx->inbound.fd = ASSUAN_INVALID_FD;
ctx->outbound.fd = ASSUAN_INVALID_FD;
if ((flags & 2))
{
ctx->listen_fd = ASSUAN_INVALID_FD;
ctx->connected_fd = fd;
}
else
{
ctx->listen_fd = fd;
ctx->connected_fd = ASSUAN_INVALID_FD;
}
ctx->deinit_handler = (flags & 1)? _assuan_uds_deinit:deinit_socket_server;
ctx->accept_handler = ((flags & 2)
? accept_connection_bottom
: accept_connection);
ctx->finish_handler = finish_connection;
ctx->io = &io;
if ((flags & 1))
_assuan_init_uds_io (ctx);
rc = _assuan_register_std_commands (ctx);
if (rc)
xfree (ctx);
else
*r_ctx = ctx;
return rc;
}
/* Save a copy of NONCE in context CTX. This should be used to
register the server's nonce with an context established by
assuan_init_socket_server. */
void
assuan_set_sock_nonce (assuan_context_t ctx, assuan_sock_nonce_t *nonce)
{
if (ctx && nonce)
ctx->listen_nonce = *nonce;
}
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