Added to CVS for future consideration.

git-svn-id: http://svn.zoneminder.com/svn/zm/trunk@511 e3e1d417-86f3-4887-817a-d78f3d33393f
This commit is contained in:
stan 2003-04-22 14:16:22 +00:00
parent 8bf858892d
commit a232e7f8b1
2 changed files with 886 additions and 0 deletions

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src/zm_comms.cpp Normal file
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//
// ZoneMinder Communications Class Implementation, $Date$, $Revision$
// Copyright (C) 2003 Philip Coombes
//
// This program 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.
//
// This program 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 <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <memory.h>
#include <alloca.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "zm.h"
#include "zm_db.h"
#include "zm_comms.h"
bool CommsBase::Terminate()
{
if ( IsOpen() )
{
Close();
}
return( true );
}
bool CommsBase::Reopen()
{
if ( !Close() )
return( false );
if ( !Open() )
return( false );
return( true );
}
int CommsBase::ReadV( int iovcnt, /* const void *, int, */ ... )
{
va_list arg_ptr;
//struct iovec iov[iovcnt];
struct iovec *iov = (struct iovec *)alloca( sizeof(struct iovec)*iovcnt );
va_start( arg_ptr, iovcnt );
for ( int i = 0; i < iovcnt; i++ )
{
iov[i].iov_base = va_arg( arg_ptr, void * );
iov[i].iov_len = va_arg( arg_ptr, int );
}
va_end( arg_ptr );
return( ::readv( rd, iov, iovcnt ) );
}
int CommsBase::WriteV( int iovcnt, /* const void *, int, */ ... )
{
va_list arg_ptr;
//struct iovec iov[iovcnt];
struct iovec *iov = (struct iovec *)alloca( sizeof(struct iovec)*iovcnt );
va_start( arg_ptr, iovcnt );
for ( int i = 0; i < iovcnt; i++ )
{
iov[i].iov_base = va_arg( arg_ptr, void * );
iov[i].iov_len = va_arg( arg_ptr, int );
}
va_end( arg_ptr );
return( ::writev( wd, iov, iovcnt ) );
}
bool Pipe::Open()
{
if ( pipe( fd ) < 0 )
{
Error(( "pipe(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool Pipe::Close()
{
if ( fd[0] > -1 ) close( fd[0] );
fd[0] = -1;
if ( fd[1] > -1 ) close( fd[1] );
fd[1] = -1;
return( true );
}
bool Pipe::SetBlocking( bool blocking )
{
int flags;
/* Now set it for non-blocking I/O */
if ( (flags = fcntl( fd[1], F_GETFL )) < 0 )
{
Error(( "fcntl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
if ( blocking )
{
flags &= ~O_NONBLOCK;
}
else
{
flags |= O_NONBLOCK;
}
if ( fcntl( fd[1], F_SETFL, flags ) < 0 )
{
Error(( "fcntl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketBase::Socket()
{
if ( (sd = ::socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
{
Error(( "socket(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
int val = 1;
(void)::setsockopt( sd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val) );
(void)::setsockopt( sd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val) );
return( true );
}
bool SocketBase::Close()
{
if ( sd > -1 ) close( sd );
sd = -1;
return( true );
}
int SocketBase::BytesToRead() const
{
int bytes_to_read = 0;
if ( ioctl( sd, FIONREAD, &bytes_to_read ) < 0 )
{
Error(( "ioctl(), errno = %d, error = %s", errno, strerror(errno) ));
return( -1 );
}
return( bytes_to_read );
}
bool SocketBase::GetBlocking( bool &blocking )
{
int flags;
if ( (flags = fcntl( sd, F_GETFL )) < 0 )
{
Error(( "fcntl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
blocking = (flags & O_NONBLOCK);
return( true );
}
bool SocketBase::SetBlocking( bool blocking )
{
#if 0
// ioctl is apparently not recommended
int ioctl_arg = !blocking;
if ( ioctl( sd, FIONBIO, &ioctl_arg ) < 0 )
{
Error(( "ioctl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
#endif
int flags;
/* Now set it for non-blocking I/O */
if ( (flags = fcntl( sd, F_GETFL )) < 0 )
{
Error(( "fcntl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
if ( blocking )
{
flags &= ~O_NONBLOCK;
}
else
{
flags |= O_NONBLOCK;
}
if ( fcntl( sd, F_SETFL, flags ) < 0 )
{
Error(( "fcntl(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketBase::GetSendBufferSize( int &buffersize ) const
{
socklen_t optlen = sizeof(buffersize);
if ( getsockopt( sd, SOL_SOCKET, SO_SNDBUF, &buffersize, &optlen ) < 0 )
{
Error(( "getsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( -1 );
}
return( buffersize );
}
bool SocketBase::GetRecvBufferSize( int &buffersize ) const
{
socklen_t optlen = sizeof(buffersize);
if ( getsockopt( sd, SOL_SOCKET, SO_RCVBUF, &buffersize, &optlen ) < 0 )
{
Error(( "getsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( -1 );
}
return( buffersize );
}
bool SocketBase::SetSendBufferSize( int buffersize )
{
if ( setsockopt( sd, SOL_SOCKET, SO_SNDBUF, (char *)&buffersize, sizeof(buffersize)) < 0 )
{
Error(( "setsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketBase::SetRecvBufferSize( int buffersize )
{
if ( setsockopt( sd, SOL_SOCKET, SO_RCVBUF, (char *)&buffersize, sizeof(buffersize)) < 0 )
{
Error(( "setsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketBase::GetRouting( bool &route ) const
{
int dontroute;
socklen_t optlen = sizeof(dontroute);
if ( getsockopt( sd, SOL_SOCKET, SO_DONTROUTE, &dontroute, &optlen ) < 0 )
{
Error(( "getsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
route = !dontroute;
return( true );
}
bool SocketBase::SetRouting( bool route )
{
int dontroute = !route;
if ( setsockopt( sd, SOL_SOCKET, SO_DONTROUTE, (char *)&dontroute, sizeof(dontroute)) < 0 )
{
Error(( "setsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketBase::GetNoDelay( bool &nodelay ) const
{
int int_nodelay;
socklen_t optlen = sizeof(int_nodelay);
if ( getsockopt( sd, IPPROTO_TCP, TCP_NODELAY, &int_nodelay, &optlen ) < 0 )
{
Error(( "getsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
nodelay = int_nodelay;
return( true );
}
bool SocketBase::SetNoDelay( bool nodelay )
{
int int_nodelay = nodelay;
if ( setsockopt( sd, IPPROTO_TCP, TCP_NODELAY, (char *)&int_nodelay, sizeof(int_nodelay)) < 0 )
{
Error(( "setsockopt(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool SocketClient::SetupRemoteHost( const char *host )
{
struct hostent *p_rem_host=0;
if ( !(p_rem_host = ::gethostbyname( host ) ) )
{
Error(( "gethostbyname( %s ), h_errno = %d", host, h_errno ));
return( false );
}
memcpy( &rem_host, p_rem_host, sizeof(rem_host) );
return( true );
}
bool SocketClient::SetupRemoteServ( const char *serv, const char *protocol )
{
struct servent *p_rem_serv=0;
if ( !(p_rem_serv = ::getservbyname( serv, protocol ) ) )
{
Error(( "getservbyname( %s ), errno = %d, error = %s", serv, errno, strerror(errno) ));
return( false );
}
memcpy( &rem_serv, p_rem_serv, sizeof(rem_serv) );
return( true );
}
SocketClient::SocketClient()
{
memset( &rem_host, 0, sizeof(rem_host) );
memset( &rem_serv, 0, sizeof(rem_serv) );
}
bool SocketClient::Open()
{
if ( !Socket() )
return( false );
struct sockaddr_in rem_addr;
memset( &rem_addr, 0, sizeof(rem_addr) );
rem_addr.sin_port = rem_serv.s_port;
rem_addr.sin_family = AF_INET;
rem_addr.sin_addr.s_addr = ((struct in_addr *)(rem_host.h_addr))->s_addr;
if ( ::connect( sd, (struct sockaddr *)&rem_addr, sizeof(rem_addr) ) == -1 )
{
Error(( "connect(), errno = %d, error = %s", errno, strerror(errno) ));
Close();
return( false );
}
return( true );
}
bool UDPSocket::Socket()
{
if ( (sd = ::socket( AF_INET, SOCK_DGRAM, 0 ) ) < 0 )
{
Error(( "socket(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
return( true );
}
bool UDPSocket::Initialise( const char *host, const char *service )
{
if ( !SetupRemoteHost( host ) )
return( false );
if ( !SetupRemoteServ( service, "udp" ) )
return( false );
if ( !Terminate() )
return( false );
return( true );
}
TCPClient::TCPClient()
{
state = DISCONNECTED;
}
bool TCPClient::Initialise( const char *host, const char *service )
{
state = DISCONNECTED;
if ( !SetupRemoteHost( host ) )
return( false );
if ( !SetupRemoteServ( service, "tcp" ) )
return( false );
if ( !Terminate() )
return( false );
return( true );
}
bool TCPClient::Open()
{
if ( !SocketClient::Open() )
return( false );
state = CONNECTED;
return( true );
}
bool TCPClient::Close()
{
if ( !SocketClient::Close() )
return( false );
state = DISCONNECTED;
return( true );
}
bool TCPServer::SetupLocalHost()
{
char host[MAXHOSTNAMELEN];
if ( ::gethostname( host, sizeof(host) ) == -1 )
{
Error(( "gethostname(), errno = %d, error = %s", errno, strerror(errno) ));
return( false );
}
struct hostent *p_loc_host=0;
if ( !(p_loc_host = ::gethostbyname( host ) ) )
{
Error(( "gethostbyname( %s ), h_errno = %d", host, h_errno ));
return( false );
}
memcpy( &loc_host, p_loc_host, sizeof(loc_host) );
return( true );
}
bool TCPServer::SetupLocalServ( const char *serv )
{
struct servent *p_loc_serv=0;
if ( !(p_loc_serv = ::getservbyname( serv, "tcp" ) ) )
{
Error(( "getservbyname( %s ), errno = %d, error = %s", serv, errno, strerror(errno) ));
return( false );
}
memcpy( &loc_serv, p_loc_serv, sizeof(loc_serv) );
return( true );
}
TCPServer::TCPServer()
{
state = DISCONNECTED;
memset( &loc_host, 0, sizeof(loc_host) );
memset( &loc_serv, 0, sizeof(loc_serv) );
}
TCPServer::TCPServer( const TCPServer &server, int new_sd )
{
state = server.state;
memcpy( &loc_host, &server.loc_host, sizeof(loc_host) );
memcpy( &loc_serv, &server.loc_serv, sizeof(loc_serv) );
sd = new_sd;
}
bool TCPServer::Initialise( const char *service )
{
state = DISCONNECTED;
if ( !SetupLocalHost() )
return( false );
if ( !SetupLocalServ( service ) )
return( false );
if ( !Terminate() )
return( false );
return( true );
}
bool TCPServer::Open()
{
if ( !Socket() )
return( false );
struct sockaddr_in loc_addr;
memset( &loc_addr, 0, sizeof(loc_addr) );
loc_addr.sin_port = loc_serv.s_port;
loc_addr.sin_family = AF_INET;
loc_addr.sin_addr.s_addr = INADDR_ANY;
if ( ::bind( sd, (struct sockaddr *)&loc_addr, sizeof(loc_addr) ) == -1 )
{
Error(( "bind(), errno = %d, error = %s", errno, strerror(errno) ));
Close();
return( false );
}
if ( ::listen( sd, SOMAXCONN ) == -1 )
{
Error(( "listen(), errno = %d, error = %s", errno, strerror(errno) ));
Close();
return( false );
}
state = LISTENING;
return( true );
}
bool TCPServer::Accept()
{
struct sockaddr_in rem_addr;
socklen_t rem_addr_size = sizeof(rem_addr);
memset( &rem_addr, 0, sizeof(rem_addr) );
int new_sd=-1;
if ( (new_sd = accept( sd, (struct sockaddr *)&rem_addr, &rem_addr_size )) == -1 )
{
Error(( "accept(), errno = %d, error = %s", errno, strerror(errno) ));
Close();
return( false );
}
close( sd );
sd = new_sd;
state = CONNECTED;
return( true );
}
bool TCPServer::Accept( TCPServer *&server )
{
struct sockaddr_in rem_addr;
socklen_t rem_addr_size = sizeof(rem_addr);
memset( &rem_addr, 0, sizeof(rem_addr) );
int new_sd=-1;
if ( (new_sd = accept( sd, (struct sockaddr *)&rem_addr, &rem_addr_size )) == -1 )
{
Error(( "connect(), errno = %d, error = %s", errno, strerror(errno) ));
Close();
return( false );
}
server = new TCPServer( *this, new_sd );
return( true );
}
bool TCPServer::Close()
{
if ( !SocketBase::Close() )
return( false );
state = DISCONNECTED;
return( true );
}

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//
// ZoneMinder Communicatoions Class Interface, $Date$, $Revision$
// Copyright (C) 2003 Philip Coombes
//
// This program 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.
//
// This program 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.
//
#ifndef ZM_COMMS_H
#define ZM_COMMS_H
#include <netdb.h>
#include "zm.h"
#include "zm_debug.h"
class CommsBase
{
protected:
const int &rd;
const int &wd;
protected:
CommsBase( int &p_rd, int &p_wd ) : rd( p_rd ), wd( p_wd )
{
}
virtual ~CommsBase()
{
}
protected:
virtual bool Terminate();
virtual bool Open()=0;
virtual bool Close()=0;
virtual bool IsOpen() const=0;
virtual bool SetBlocking( bool blocking )=0;
public:
virtual bool Reopen();
virtual int Read( void *msg, int len )
{
return( ::read( rd, msg, len ) );
}
virtual int Write( const void *msg, int len )
{
return( ::write( wd, msg, len ) );
}
virtual int ReadV( const struct iovec *iov, int iovcnt )
{
return( ::readv( rd, iov, iovcnt ) );
}
virtual int WriteV( const struct iovec *iov, int iovcnt )
{
return( ::writev( wd, iov, iovcnt ) );
}
virtual int ReadV( int iovcnt, /* const void *msg1, int len1, */ ... );
virtual int WriteV( int iovcnt, /* const void *msg1, int len1, */ ... );
};
class Pipe : public CommsBase
{
protected:
int fd[2];
public:
Pipe() : CommsBase( fd[0], fd[1] )
{
fd[0] = -1;
fd[1] = -1;
}
~Pipe()
{
Terminate();
}
public:
bool Open();
bool Close();
bool IsOpen() const
{
return( fd[0] != -1 && fd[1] != -1 );
}
int GetReadDesc() const
{
return( fd[0] );
}
int GetWriteDesc() const
{
return( fd[1] );
}
bool SetBlocking( bool blocking );
};
class SocketBase : public CommsBase
{
protected:
int sd;
protected:
SocketBase() : CommsBase( sd, sd )
{
sd = -1;
}
~SocketBase()
{
Terminate();
}
virtual bool Socket();
public:
virtual bool Open()=0;
virtual bool Close();
virtual int Send( const void *msg, int len )
{
return( ::send( sd, msg, len, 0 ) );
}
virtual int Recv( void *msg, int len )
{
return( ::recv( sd, msg, len, 0 ) );
}
int BytesToRead() const;
virtual bool IsOpen() const
{
return( sd != -1 );
}
int GetDesc() const
{
return( sd );
}
bool GetBlocking( bool &blocking );
bool SetBlocking( bool blocking );
bool GetSendBufferSize( int & ) const;
bool GetRecvBufferSize( int & ) const;
bool SetSendBufferSize( int );
bool SetRecvBufferSize( int );
bool GetRouting( bool & ) const;
bool SetRouting( bool );
bool GetNoDelay( bool & ) const;
bool SetNoDelay( bool );
virtual const char *GetHostName() const=0;
virtual const char *GetServName() const=0;
};
class SocketClient : public SocketBase
{
protected:
struct hostent rem_host;
struct servent rem_serv;
protected:
bool SetupRemoteHost( const char *host );
bool SetupRemoteServ( const char *serv, const char *protocol );
public:
SocketClient();
virtual bool Initialise( const char *host, const char *service )=0;
virtual bool Open();
const char *GetHostName() const
{
return( rem_host.h_name );
}
const char *GetServName() const
{
return( rem_serv.s_name );
}
};
class UDPSocket : public SocketClient
{
protected:
virtual bool Socket();
public:
virtual bool Initialise( const char *host, const char *service );
};
class TCPClient : public SocketClient
{
public:
typedef enum { DISCONNECTED, CONNECTED } ConnectionState;
protected:
ConnectionState state;
public:
TCPClient();
virtual bool Initialise( const char *host, const char *service );
virtual bool Open();
virtual bool Close();
ConnectionState GetConnectionState() const
{
return( state );
}
bool IsDisconnected() const
{
return( state == DISCONNECTED );
}
bool IsConnected() const
{
return( state == CONNECTED );
}
};
class TCPServer : public SocketBase
{
public:
typedef enum { DISCONNECTED, LISTENING, CONNECTED } ConnectionState;
protected:
ConnectionState state;
protected:
struct hostent loc_host;
struct servent loc_serv;
protected:
bool SetupLocalHost();
bool SetupLocalServ( const char *serv );
public:
TCPServer( const TCPServer &, int );
public:
TCPServer();
virtual bool Initialise( const char *service );
virtual bool Open();
bool Accept();
bool Accept( TCPServer *& );
virtual bool Close();
ConnectionState GetConnectionState() const
{
return( state );
}
bool IsDisconnected() const
{
return( state == DISCONNECTED );
}
bool IsListening() const
{
return( state == LISTENING );
}
bool IsConnected() const
{
return( state == CONNECTED );
}
const char *GetHostName() const
{
return( loc_host.h_name );
}
const char *GetServName() const
{
return( loc_serv.s_name );
}
};
#endif // ZM_COMMS_H