273 lines
6.6 KiB
C
273 lines
6.6 KiB
C
/*
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* MUSCLE SmartCard Development ( https://pcsclite.apdu.fr/ )
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*
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* Copyright (C) 2001-2004
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* David Corcoran <corcoran@musclecard.com>
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* Copyright (C) 2003-2004
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* Damien Sauveron <damien.sauveron@labri.fr>
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* Copyright (C) 2002-2010
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* Ludovic Rousseau <ludovic.rousseau@free.fr>
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*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* @brief client/server communication (on the server side only)
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*
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* A file based socket (\c commonSocket) is used to send/receive only messages
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* among clients and server.\n
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* The messages' data are passed throw a memory mapped file: \c sharedSegmentMsg.
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*/
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#include "config.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/un.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <time.h>
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#include <string.h>
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#ifdef HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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#ifdef USE_LIBSYSTEMD
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#include <systemd/sd-daemon.h>
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#endif
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#include "misc.h"
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#include "pcscd.h"
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#include "winscard.h"
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#include "debuglog.h"
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#include "winscard_msg.h"
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/**
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* Socket to a file, used for clients-server comminication.
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*/
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static int commonSocket = 0;
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extern char AraKiri;
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/**
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* @brief Accepts a Client connection.
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*
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* Called by \c ProcessEventsServer().
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*
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* @param[out] pdwClientID Connection ID used to reference the Client.
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*
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* @return Error code.
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* @retval 0 Success.
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* @retval -1 Can not establish the connection.
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*/
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static int ProcessCommonChannelRequest(/*@out@*/ uint32_t *pdwClientID)
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{
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socklen_t clnt_len;
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int new_sock;
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struct sockaddr_un clnt_addr;
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clnt_len = sizeof(clnt_addr);
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if ((new_sock = accept(commonSocket, (struct sockaddr *) &clnt_addr,
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&clnt_len)) < 0)
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{
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Log2(PCSC_LOG_CRITICAL, "Accept on common socket: %s",
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strerror(errno));
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return -1;
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}
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*pdwClientID = new_sock;
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return 0;
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}
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/**
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* @brief Prepares the communication channel used by the server to talk to the
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* clients.
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*
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* This is called by the server to create a socket for local IPC with the
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* clients. The socket is associated to the file \c PCSCLITE_CSOCK_NAME.
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* Each client will open a connection to this socket.
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*
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* @return Error code.
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* @retval 0 Success
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* @retval -1
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* - Can not create the socket
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* - or Can not bind the socket to the file \c PCSCLITE_CSOCK_NAME
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* - or Can not put the socket in listen mode.
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*/
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INTERNAL int32_t InitializeSocket(void)
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{
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union
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{
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struct sockaddr sa;
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struct sockaddr_un un;
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} sa;
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/*
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* Create the common shared connection socket
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*/
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if ((commonSocket = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
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{
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Log2(PCSC_LOG_CRITICAL, "Unable to create common socket: %s",
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strerror(errno));
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return -1;
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}
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memset(&sa, 0, sizeof sa);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, PCSCLITE_CSOCK_NAME, sizeof sa.un.sun_path);
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(void)remove(PCSCLITE_CSOCK_NAME);
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if (bind(commonSocket, &sa.sa, sizeof sa) < 0)
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{
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Log2(PCSC_LOG_CRITICAL, "Unable to bind common socket: %s",
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strerror(errno));
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return -1;
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}
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if (listen(commonSocket, 1) < 0)
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{
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Log2(PCSC_LOG_CRITICAL, "Unable to listen common socket: %s",
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strerror(errno));
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return -1;
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}
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/*
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* Chmod the public entry channel
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*/
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(void)chmod(PCSCLITE_CSOCK_NAME, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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return 0;
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}
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#ifdef USE_LIBSYSTEMD
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/**
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* @brief Acquires a socket passed in from systemd.
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*
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* This is called by the server to start listening on an existing socket for
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* local IPC with the clients.
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*
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* @param fd The file descriptor to start listening on.
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*
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* @return Error code.
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* @retval 0 Success
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* @retval -1 Passed FD is not an UNIX socket.
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*/
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INTERNAL int32_t ListenExistingSocket(int fd)
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{
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if (!sd_is_socket(fd, AF_UNIX, SOCK_STREAM, -1))
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{
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Log1(PCSC_LOG_CRITICAL, "Passed FD is not an UNIX socket");
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return -1;
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}
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commonSocket = fd;
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return 0;
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}
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#endif
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/**
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* @brief Looks for messages sent by clients.
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*
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* This is called by the Server's function \c SVCServiceRunLoop().
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*
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* @param[out] pdwClientID Connection ID used to reference the Client.
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*
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* @return Error code.
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* @retval 0 Success.
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* @retval -1 Error accessing the communication channel.
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* @retval -2 EINTR
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* @retval 2 Timeout.
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*/
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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#define DO_TIMEOUT
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#endif
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INTERNAL int32_t ProcessEventsServer(uint32_t *pdwClientID)
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{
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fd_set read_fd;
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int selret;
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#ifdef DO_TIMEOUT
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struct timeval tv;
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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#endif
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FD_ZERO(&read_fd);
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/*
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* Set up the bit masks for select
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*/
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FD_SET(commonSocket, &read_fd);
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selret = select(commonSocket + 1, &read_fd, (fd_set *) NULL,
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(fd_set *) NULL,
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#ifdef DO_TIMEOUT
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&tv
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#else
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NULL
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#endif
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);
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if (selret < 0)
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{
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if (EINTR == errno)
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return -2;
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Log2(PCSC_LOG_CRITICAL, "Select returns with failure: %s",
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strerror(errno));
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return -1;
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}
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if (selret == 0)
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/* timeout. On *BSD only */
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return 2;
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/*
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* A common pipe packet has arrived - it could be a new application
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*/
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if (FD_ISSET(commonSocket, &read_fd))
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{
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Log1(PCSC_LOG_DEBUG, "Common channel packet arrival");
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if (ProcessCommonChannelRequest(pdwClientID) == -1)
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{
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Log2(PCSC_LOG_ERROR,
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"error in ProcessCommonChannelRequest: %d", *pdwClientID);
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return -1;
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}
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}
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else
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return -1;
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Log2(PCSC_LOG_DEBUG,
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"ProcessCommonChannelRequest detects: %d", *pdwClientID);
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return 0;
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}
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