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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2009-2012 -- leonerd@leonerd.org.uk |
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package IO::Socket::Packet; |
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use strict; |
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use warnings; |
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use base qw( IO::Socket ); |
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our $VERSION = '0.10'; |
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use Carp; |
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use POSIX qw( EAGAIN ); |
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use Socket qw( AF_INET SOCK_STREAM SOCK_RAW ); |
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use Socket::Packet qw( |
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AF_PACKET ETH_P_ALL |
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pack_sockaddr_ll unpack_sockaddr_ll |
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pack_packet_mreq |
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unpack_tpacket_stats |
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siocgstamp siocgstampns |
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siocgifindex siocgifname |
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recv_len |
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SOL_PACKET |
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PACKET_ADD_MEMBERSHIP |
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PACKET_DROP_MEMBERSHIP |
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PACKET_STATISTICS |
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PACKET_MR_MULTICAST |
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PACKET_MR_PROMISC |
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PACKET_MR_ALLMULTI |
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720
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); |
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__PACKAGE__->register_domain( AF_PACKET ); |
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=head1 NAME |
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C - Object interface to C domain sockets |
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=head1 SYNOPSIS |
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use IO::Socket::Packet; |
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use Socket::Packet qw( unpack_sockaddr_ll ); |
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my $sock = IO::Socket::Packet->new( IfIndex => 0 ); |
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while( my ( $protocol, $ifindex, $hatype, $pkttype, $addr ) = |
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$sock->recv_unpack( my $packet, 8192, 0 ) ) { |
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... |
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} |
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58
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=head1 DESCRIPTION |
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60
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This class provides an object interface to C sockets on Linux. It |
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is built upon L and inherits all the methods defined by this base |
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class. |
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64
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=cut |
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66
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=head1 CONSTRUCTOR |
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=cut |
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70
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=head2 $sock = IO::Socket::Packet->new( %args ) |
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Creates a new C object. If any arguments are passed it |
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will be configured to contain a newly created socket handle, and be Ced |
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as required by the arguments. The recognised arguments are: |
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=over 8 |
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78
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=item Type => INT |
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80
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The socktype to use; should be either C or C. It not |
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supplied a default of C will be used. |
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83
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=item Protocol => INT |
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85
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Ethernet protocol number to bind to. To capture all protocols, use the |
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C constant (or omit this key, which implies that as a default). |
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=item IfIndex => INT |
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90
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If supplied, binds the socket to the specified interface index. To bind to all |
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interfaces, use 0 (or omit this key, which implies that as a default). |
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93
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=item IfName => STRING |
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If supplied, binds the socket to the interface with the specified name. |
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=back |
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99
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=cut |
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101
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sub configure |
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{ |
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my $self = shift; |
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my ( $arg ) = @_; |
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106
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my $type = $arg->{Type} || SOCK_RAW; |
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108
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$self->socket( AF_PACKET, $type, 0 ) or return undef; |
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110
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# bind() arguments |
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145
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my ( $protocol, $ifindex ); |
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113
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$protocol = $arg->{Protocol} if exists $arg->{Protocol}; |
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3
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100
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$ifindex = $arg->{IfIndex} if exists $arg->{IfIndex}; |
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116
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3
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100
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if( !defined $ifindex and exists $arg->{IfName} ) { |
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1
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$ifindex = siocgifindex( $self, $arg->{IfName} ); |
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50
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defined $ifindex or return undef; |
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} |
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121
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3
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100
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40
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$self->bind( pack_sockaddr_ll( |
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50
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122
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defined $protocol ? $protocol : ETH_P_ALL, |
123
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$ifindex || 0, |
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0, 0, '' ) ) or return undef; |
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126
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3
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60
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return $self; |
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} |
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129
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=head1 METHODS |
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131
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=cut |
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133
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=head2 ( $addr, $len ) = $sock->recv_len( $buffer, $maxlen, $flags ) |
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135
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Similar to Perl's C builtin, except it returns the packet length as an |
136
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explict return value. This may be useful if C<$flags> contains the |
137
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C flag, obtaining the true length of the packet on the wire, even |
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if this is longer than the data written in the buffer. |
139
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140
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=cut |
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142
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# don't actually need to implement it; the imported symbol works fine |
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144
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=head2 ( $protocol, $ifindex, $hatype, $pkttype, $addr, $len ) = $sock->recv_unpack( $buffer, $size, $flags ) |
145
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146
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This method is a combination of C and C. If it |
147
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successfully receives a packet, it unpacks the address and returns the fields |
148
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from it, and the length of the received packet. If it fails, it returns an |
149
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empty list. |
150
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151
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If the ring-buffer has been set using C, it will automatically |
152
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be used by this method. |
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154
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=cut |
155
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156
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sub recv_unpack |
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{ |
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0
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1
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my $self = shift; |
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160
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0
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0
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if( defined ${*$self}{packet_rx_ring} ) { |
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161
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defined $self->wait_ring_frame( my $buffer, \my %info ) or return; |
162
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163
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# Copy to caller |
164
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0
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$_[0] = $buffer; |
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166
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$self->done_ring_frame; |
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168
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${*$self}{packet_ts_sec} = $info{tp_sec}; |
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169
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${*$self}{packet_ts_nsec} = $info{tp_nsec}; |
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170
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171
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0
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0
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return ( $info{sll_protocol}, |
172
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$info{sll_ifindex}, |
173
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$info{sll_hatype}, |
174
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$info{sll_pkttype}, |
175
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$info{sll_addr}, |
176
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$info{tp_len} ); |
177
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} |
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179
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0
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my ( $addr, $len ) = $self->recv_len( @_ ) or return; |
180
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return unpack_sockaddr_ll( $addr ), $len; |
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} |
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183
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=head2 $protocol = $sock->protocol |
184
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185
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Returns the ethertype protocol the socket is bound to. |
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187
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=cut |
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189
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sub protocol |
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{ |
191
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2
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2
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1
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2129
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my $self = shift; |
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2
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12
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return (unpack_sockaddr_ll($self->sockname))[0]; |
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} |
194
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195
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=head2 $ifindex = $sock->ifindex |
196
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197
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Returns the interface index the socket is bound to. |
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199
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=cut |
200
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201
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sub ifindex |
202
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{ |
203
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5
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1
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682
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my $self = shift; |
204
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5
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16
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return (unpack_sockaddr_ll($self->sockname))[1]; |
205
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} |
206
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207
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=head2 $ifname = $sock->ifname |
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209
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Returns the name of the interface the socket is bound to. |
210
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211
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=cut |
212
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213
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sub ifname |
214
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{ |
215
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3
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3
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1
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916
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my $self = shift; |
216
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3
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8
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return siocgifname( $self, $self->ifindex ); |
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} |
218
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219
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=head2 $hatype = $sock->hatype |
220
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221
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|
Returns the hardware address type for the interface the socket is bound to. |
222
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223
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=cut |
224
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225
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sub hatype |
226
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{ |
227
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2
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2
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1
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620
|
my $self = shift; |
228
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2
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10
|
return (unpack_sockaddr_ll($self->sockname))[2]; |
229
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|
} |
230
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231
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|
=head2 $time = $sock->timestamp |
232
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233
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=head2 ( $sec, $usec ) = $sock->timestamp |
234
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235
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|
Returns the timestamp of the last received packet on the socket (as obtained |
236
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|
|
by the C C). In scalar context, returns a single |
237
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|
floating-point value in UNIX epoch seconds. In list context, returns the |
238
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number of seconds, and the number of microseconds. |
239
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240
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|
If the ring-buffer has been set using C, this method returns |
241
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|
the timestamp of the last packet received from it. |
242
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243
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=cut |
244
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|
245
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|
sub timestamp |
246
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{ |
247
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1
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1
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1
|
367
|
my $self = shift; |
248
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|
249
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1
|
50
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|
3
|
if( defined ${*$self}{packet_ts_sec} ) { |
|
1
|
|
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|
|
6
|
|
250
|
0
|
|
|
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|
0
|
my $sec = delete ${*$self}{packet_ts_sec}; |
|
0
|
|
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|
0
|
|
251
|
0
|
|
|
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|
0
|
my $nsec = delete ${*$self}{packet_ts_nsec}; |
|
0
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|
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0
|
|
252
|
|
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|
|
|
|
253
|
0
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0
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0
|
return wantarray ? ( $sec, int($nsec/1000) ) : $sec + $nsec/1_000_000_000; |
254
|
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|
|
} |
255
|
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|
256
|
1
|
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|
20
|
return siocgstamp( $self ); |
257
|
|
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|
|
} |
258
|
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259
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|
|
=head2 $time = $sock->timestamp_nano |
260
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261
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|
|
=head2 ( $sec, $nsec ) = $sock->timestamp_nano |
262
|
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|
263
|
|
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|
|
Returns the nanosecond-precise timestamp of the last received packet on the |
264
|
|
|
|
|
|
|
socket (as obtained by the C C). In scalar context, |
265
|
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|
|
returns a single floating-point value in UNIX epoch seconds. In list context, |
266
|
|
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|
|
|
returns the number of seconds, and the number of nanoseconds. |
267
|
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|
268
|
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|
|
|
If the ring-buffer has been set using C, this method returns |
269
|
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|
|
|
the timestamp of the last packet received from it. |
270
|
|
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|
|
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|
271
|
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|
|
=cut |
272
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|
273
|
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|
|
|
sub timestamp_nano |
274
|
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|
|
|
|
|
{ |
275
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
276
|
|
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|
|
|
|
|
277
|
0
|
0
|
|
|
|
0
|
if( defined ${*$self}{packet_ts_sec} ) { |
|
0
|
|
|
|
|
0
|
|
278
|
0
|
|
|
|
|
0
|
my $sec = delete ${*$self}{packet_ts_sec}; |
|
0
|
|
|
|
|
0
|
|
279
|
0
|
|
|
|
|
0
|
my $nsec = delete ${*$self}{packet_ts_nsec}; |
|
0
|
|
|
|
|
0
|
|
280
|
|
|
|
|
|
|
|
281
|
0
|
0
|
|
|
|
0
|
return wantarray ? ( $sec, $nsec ) : $sec + $nsec/1_000_000_000; |
282
|
|
|
|
|
|
|
} |
283
|
|
|
|
|
|
|
|
284
|
0
|
|
|
|
|
0
|
return siocgstampns( $self ); |
285
|
|
|
|
|
|
|
} |
286
|
|
|
|
|
|
|
|
287
|
|
|
|
|
|
|
=head1 INTERFACE NAME UTILITIES |
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
The following methods are utilities around C and C. |
290
|
|
|
|
|
|
|
If called on an object, they use the encapsulated socket. If called as class |
291
|
|
|
|
|
|
|
methods, they will create a temporary socket to pass to the kernel, then close |
292
|
|
|
|
|
|
|
it again. |
293
|
|
|
|
|
|
|
|
294
|
|
|
|
|
|
|
=cut |
295
|
|
|
|
|
|
|
|
296
|
|
|
|
|
|
|
=head2 $ifindex = $sock->ifname2index( $ifname ) |
297
|
|
|
|
|
|
|
|
298
|
|
|
|
|
|
|
=head2 $ifindex = IO::Socket::Packet->ifname2index( $ifname ) |
299
|
|
|
|
|
|
|
|
300
|
|
|
|
|
|
|
Returns the name for the given interface index, or C if it doesn't |
301
|
|
|
|
|
|
|
exist. |
302
|
|
|
|
|
|
|
|
303
|
|
|
|
|
|
|
=cut |
304
|
|
|
|
|
|
|
|
305
|
|
|
|
|
|
|
sub ifname2index |
306
|
|
|
|
|
|
|
{ |
307
|
1
|
|
|
1
|
1
|
613
|
my $self = shift; |
308
|
1
|
|
|
|
|
3
|
my ( $ifname ) = @_; |
309
|
|
|
|
|
|
|
|
310
|
1
|
|
|
|
|
2
|
my $sock; |
311
|
1
|
50
|
|
|
|
5
|
if( ref $self ) { |
312
|
0
|
|
|
|
|
0
|
$sock = $self; |
313
|
|
|
|
|
|
|
} |
314
|
|
|
|
|
|
|
else { |
315
|
1
|
50
|
|
|
|
30
|
socket( $sock, AF_INET, SOCK_STREAM, 0 ) or |
316
|
|
|
|
|
|
|
croak "Cannot socket(AF_INET) - $!"; |
317
|
|
|
|
|
|
|
} |
318
|
|
|
|
|
|
|
|
319
|
1
|
|
|
|
|
29
|
return siocgifindex( $sock, $ifname ); |
320
|
|
|
|
|
|
|
} |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
=head2 $ifname = $sock->ifindex2name( $ifindex ) |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
=head2 $ifname = IO::Socket::Packet->ifindex2name( $ifindex ) |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
Returns the index for the given interface name, or C if it doesn't |
327
|
|
|
|
|
|
|
exist. |
328
|
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
=cut |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
sub ifindex2name |
332
|
|
|
|
|
|
|
{ |
333
|
2
|
|
|
2
|
1
|
25
|
my $self = shift; |
334
|
2
|
|
|
|
|
5
|
my ( $ifindex ) = @_; |
335
|
|
|
|
|
|
|
|
336
|
2
|
|
|
|
|
25
|
my $sock; |
337
|
2
|
50
|
|
|
|
11
|
if( ref $self ) { |
338
|
0
|
|
|
|
|
0
|
$sock = $self; |
339
|
|
|
|
|
|
|
} |
340
|
|
|
|
|
|
|
else { |
341
|
2
|
50
|
|
|
|
82
|
socket( $sock, AF_INET, SOCK_STREAM, 0 ) or |
342
|
|
|
|
|
|
|
croak "Cannot socket(AF_INET) - $!"; |
343
|
|
|
|
|
|
|
} |
344
|
|
|
|
|
|
|
|
345
|
2
|
|
|
|
|
41
|
return siocgifname( $sock, $ifindex ); |
346
|
|
|
|
|
|
|
} |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
sub _make_sockopt_int |
349
|
|
|
|
|
|
|
{ |
350
|
0
|
|
|
0
|
|
0
|
my ( $optname ) = @_; |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
# IO::Socket automatically handles the pack/unpack in this case |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
sub { |
355
|
0
|
|
|
0
|
|
0
|
my $sock = shift; |
356
|
|
|
|
|
|
|
|
357
|
0
|
0
|
|
|
|
0
|
if( @_ ) { |
358
|
0
|
|
|
|
|
0
|
$sock->setsockopt( SOL_PACKET, $optname, $_[0] ); |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
else { |
361
|
0
|
|
|
|
|
0
|
return $sock->getsockopt( SOL_PACKET, $optname ); |
362
|
|
|
|
|
|
|
} |
363
|
0
|
|
|
|
|
0
|
}; |
364
|
|
|
|
|
|
|
} |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
=head1 SOCKET OPTION ACCESSORS |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
=cut |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
=head2 $sock->add_multicast( $addr, $ifindex ) |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
Adds the given multicast address on the given interface index. If the |
373
|
|
|
|
|
|
|
interface index is not supplied, C<< $sock->ifindex >> is used. |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
=cut |
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
sub add_multicast |
378
|
|
|
|
|
|
|
{ |
379
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
380
|
0
|
|
|
|
|
0
|
my ( $addr, $ifindex ) = @_; |
381
|
0
|
0
|
|
|
|
0
|
defined $ifindex or $ifindex = $self->ifindex; |
382
|
|
|
|
|
|
|
|
383
|
0
|
|
|
|
|
0
|
$self->setsockopt( SOL_PACKET, PACKET_ADD_MEMBERSHIP, |
384
|
|
|
|
|
|
|
pack_packet_mreq( $ifindex, PACKET_MR_MULTICAST, $addr ) |
385
|
|
|
|
|
|
|
); |
386
|
|
|
|
|
|
|
} |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
=head2 $sock->drop_multicast( $addr, $ifindex ) |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
Drops the given multicast address on the given interface index. If the |
391
|
|
|
|
|
|
|
interface index is not supplied, C<< $sock->ifindex >> is used. |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
=cut |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
sub drop_multicast |
396
|
|
|
|
|
|
|
{ |
397
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
398
|
0
|
|
|
|
|
0
|
my ( $addr, $ifindex ) = @_; |
399
|
0
|
0
|
|
|
|
0
|
defined $ifindex or $ifindex = $self->ifindex; |
400
|
|
|
|
|
|
|
|
401
|
0
|
|
|
|
|
0
|
$self->setsockopt( SOL_PACKET, PACKET_DROP_MEMBERSHIP, |
402
|
|
|
|
|
|
|
pack_packet_mreq( $ifindex, PACKET_MR_MULTICAST, $addr ) |
403
|
|
|
|
|
|
|
); |
404
|
|
|
|
|
|
|
} |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
=head2 $sock->promisc( $promisc, $ifindex ) |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
Sets or clears the PACKET_MR_PROMISC flag on the given interface. If the |
409
|
|
|
|
|
|
|
interface index is not supplied, C<< $sock->ifindex >> is used. |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
=cut |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
sub promisc |
414
|
|
|
|
|
|
|
{ |
415
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
416
|
0
|
|
|
|
|
0
|
my ( $value, $ifindex ) = @_; |
417
|
0
|
0
|
|
|
|
0
|
defined $ifindex or $ifindex = $self->ifindex; |
418
|
|
|
|
|
|
|
|
419
|
0
|
0
|
|
|
|
0
|
$self->setsockopt( SOL_PACKET, $value ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP, |
420
|
|
|
|
|
|
|
pack_packet_mreq( $ifindex, PACKET_MR_PROMISC, "" ) |
421
|
|
|
|
|
|
|
); |
422
|
|
|
|
|
|
|
} |
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
=head2 $sock->allmulti( $allmulti, $ifindex ) |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
Sets or clears the PACKET_MR_ALLMULTI flag on the given interface. If the |
427
|
|
|
|
|
|
|
interface index is not supplied, C<< $sock->ifindex >> is used. |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
=cut |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
sub allmulti |
432
|
|
|
|
|
|
|
{ |
433
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
434
|
0
|
|
|
|
|
0
|
my ( $value, $ifindex ) = @_; |
435
|
0
|
0
|
|
|
|
0
|
defined $ifindex or $ifindex = $self->ifindex; |
436
|
|
|
|
|
|
|
|
437
|
0
|
0
|
|
|
|
0
|
$self->setsockopt( SOL_PACKET, $value ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP, |
438
|
|
|
|
|
|
|
pack_packet_mreq( $ifindex, PACKET_MR_ALLMULTI, "" ) |
439
|
|
|
|
|
|
|
); |
440
|
|
|
|
|
|
|
} |
441
|
|
|
|
|
|
|
|
442
|
|
|
|
|
|
|
=head2 $stats = $sock->statistics |
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
Returns the socket statistics. This will be a two-field hash containing |
445
|
|
|
|
|
|
|
counts C, the total number of packets the socket has seen, and |
446
|
|
|
|
|
|
|
C, the number of packets that could not stored because the buffer was |
447
|
|
|
|
|
|
|
full. |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
=cut |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
sub statistics |
452
|
|
|
|
|
|
|
{ |
453
|
1
|
|
|
1
|
1
|
22678
|
my $self = shift; |
454
|
|
|
|
|
|
|
|
455
|
1
|
50
|
|
|
|
18
|
my $stats = $self->getsockopt( SOL_PACKET, PACKET_STATISTICS ) |
456
|
|
|
|
|
|
|
or return; |
457
|
|
|
|
|
|
|
|
458
|
1
|
|
|
|
|
28
|
my %stats; |
459
|
1
|
|
|
|
|
8
|
@stats{qw( packets drops)} = unpack_tpacket_stats( $stats ); |
460
|
|
|
|
|
|
|
|
461
|
1
|
|
|
|
|
14
|
return \%stats; |
462
|
|
|
|
|
|
|
} |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
=head2 $val = $sock->origdev |
465
|
|
|
|
|
|
|
|
466
|
|
|
|
|
|
|
=head2 $sock->origdev( $val ) |
467
|
|
|
|
|
|
|
|
468
|
|
|
|
|
|
|
Return or set the value of the C socket option. |
469
|
|
|
|
|
|
|
|
470
|
|
|
|
|
|
|
=cut |
471
|
|
|
|
|
|
|
|
472
|
|
|
|
|
|
|
if( defined &Socket::Packet::PACKET_ORIGDEV ) { |
473
|
|
|
|
|
|
|
*origdev = _make_sockopt_int( Socket::Packet::PACKET_ORIGDEV() ); |
474
|
|
|
|
|
|
|
} |
475
|
|
|
|
|
|
|
|
476
|
|
|
|
|
|
|
=head1 RING-BUFFER METHODS |
477
|
|
|
|
|
|
|
|
478
|
|
|
|
|
|
|
These methods operate on the high-performance memory-mapped capture buffer. |
479
|
|
|
|
|
|
|
|
480
|
|
|
|
|
|
|
An example of how to use these methods for packet capture is included in the |
481
|
|
|
|
|
|
|
module distribution; see F for more detail. |
482
|
|
|
|
|
|
|
|
483
|
|
|
|
|
|
|
=cut |
484
|
|
|
|
|
|
|
|
485
|
|
|
|
|
|
|
=head2 $size = $sock->setup_rx_ring( $frame_size, $frame_nr, $block_size ) |
486
|
|
|
|
|
|
|
|
487
|
|
|
|
|
|
|
Sets up the ring-buffer on the object. This method is identical to the |
488
|
|
|
|
|
|
|
C function C, except that the ring-buffer |
489
|
|
|
|
|
|
|
variable is stored transparently within the C<$sock> object; the caller does |
490
|
|
|
|
|
|
|
not need to manage it. |
491
|
|
|
|
|
|
|
|
492
|
|
|
|
|
|
|
Once this buffer is enabled, the C, C and |
493
|
|
|
|
|
|
|
C methods will automatically use it instead of the regular |
494
|
|
|
|
|
|
|
C+C interface. |
495
|
|
|
|
|
|
|
|
496
|
|
|
|
|
|
|
=cut |
497
|
|
|
|
|
|
|
|
498
|
|
|
|
|
|
|
sub setup_rx_ring |
499
|
|
|
|
|
|
|
{ |
500
|
0
|
|
|
0
|
1
|
|
my $self = shift; |
501
|
0
|
|
|
|
|
|
my ( $frame_size, $frame_nr, $block_size ) = @_; |
502
|
|
|
|
|
|
|
|
503
|
0
|
|
|
|
|
|
my $ret = Socket::Packet::setup_rx_ring( $self, $frame_size, $frame_nr, $block_size ); |
504
|
0
|
0
|
|
|
|
|
${*$self}{packet_rx_ring} = 1 if defined $ret; |
|
0
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
|
506
|
0
|
|
|
|
|
|
return $ret; |
507
|
|
|
|
|
|
|
} |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
=head2 $len = $sock->get_ring_frame( $buffer, \%info ) |
510
|
|
|
|
|
|
|
|
511
|
|
|
|
|
|
|
Receives the next packet from the ring-buffer. If there are no packets waiting |
512
|
|
|
|
|
|
|
it will return undef. This method aliases the C<$buffer> variable to the |
513
|
|
|
|
|
|
|
Ced packet buffer. |
514
|
|
|
|
|
|
|
|
515
|
|
|
|
|
|
|
For detail on the C<%info> hash, see L's C |
516
|
|
|
|
|
|
|
function. |
517
|
|
|
|
|
|
|
|
518
|
|
|
|
|
|
|
Once the caller has finished with the C<$buffer> data, the C |
519
|
|
|
|
|
|
|
method should be called to hand the frame buffer back to the kernel. |
520
|
|
|
|
|
|
|
|
521
|
|
|
|
|
|
|
=cut |
522
|
|
|
|
|
|
|
|
523
|
|
|
|
|
|
|
sub get_ring_frame |
524
|
|
|
|
|
|
|
{ |
525
|
0
|
|
|
0
|
1
|
|
my $self = shift; |
526
|
|
|
|
|
|
|
|
527
|
0
|
|
|
|
|
|
return Socket::Packet::get_ring_frame( $self, $_[0], $_[1] ); |
528
|
|
|
|
|
|
|
} |
529
|
|
|
|
|
|
|
|
530
|
|
|
|
|
|
|
=head2 $len = $sock->wait_ring_frame( $buffer, \%info ) |
531
|
|
|
|
|
|
|
|
532
|
|
|
|
|
|
|
If a packet is ready, this method sets C<$buffer> and C<%info> as per the |
533
|
|
|
|
|
|
|
C method. If there are no packets waiting and the socket is |
534
|
|
|
|
|
|
|
in blocking mode, it will C |
535
|
|
|
|
|
|
|
available. If the socket is in non-blocking mode, it will return false with |
536
|
|
|
|
|
|
|
C<$!> set to C. |
537
|
|
|
|
|
|
|
|
538
|
|
|
|
|
|
|
For detail on the C<%info> hash, see L's C |
539
|
|
|
|
|
|
|
function. |
540
|
|
|
|
|
|
|
|
541
|
|
|
|
|
|
|
Once the caller has finished with the C<$buffer> data, the C |
542
|
|
|
|
|
|
|
method should be called to hand the frame buffer back to the kernel. |
543
|
|
|
|
|
|
|
|
544
|
|
|
|
|
|
|
=cut |
545
|
|
|
|
|
|
|
|
546
|
|
|
|
|
|
|
sub wait_ring_frame |
547
|
|
|
|
|
|
|
{ |
548
|
0
|
|
|
0
|
1
|
|
my $self = shift; |
549
|
|
|
|
|
|
|
|
550
|
0
|
|
|
|
|
|
my $len; |
551
|
0
|
|
|
|
|
|
while( !defined( $len = $self->get_ring_frame( $_[0], $_[1] ) ) ) { |
552
|
0
|
0
|
|
|
|
|
$! = EAGAIN, return if not $self->blocking; |
553
|
|
|
|
|
|
|
|
554
|
0
|
|
|
|
|
|
my $rvec = ''; |
555
|
0
|
|
|
|
|
|
vec( $rvec, fileno $self, 1 ) = 1; |
556
|
0
|
0
|
|
|
|
|
select( $rvec, undef, undef, undef ) or return; |
557
|
|
|
|
|
|
|
} |
558
|
|
|
|
|
|
|
|
559
|
0
|
|
|
|
|
|
return $len; |
560
|
|
|
|
|
|
|
} |
561
|
|
|
|
|
|
|
|
562
|
|
|
|
|
|
|
=head2 $sock->done_ring_frame |
563
|
|
|
|
|
|
|
|
564
|
|
|
|
|
|
|
Hands the current ring-buffer frame back to the kernel. |
565
|
|
|
|
|
|
|
|
566
|
|
|
|
|
|
|
=cut |
567
|
|
|
|
|
|
|
|
568
|
|
|
|
|
|
|
sub done_ring_frame |
569
|
|
|
|
|
|
|
{ |
570
|
0
|
|
|
0
|
1
|
|
my $self = shift; |
571
|
|
|
|
|
|
|
|
572
|
0
|
|
|
|
|
|
Socket::Packet::done_ring_frame( $self ); |
573
|
|
|
|
|
|
|
} |
574
|
|
|
|
|
|
|
|
575
|
|
|
|
|
|
|
=head1 SEE ALSO |
576
|
|
|
|
|
|
|
|
577
|
|
|
|
|
|
|
=over 4 |
578
|
|
|
|
|
|
|
|
579
|
|
|
|
|
|
|
=item * |
580
|
|
|
|
|
|
|
|
581
|
|
|
|
|
|
|
L - interface to Linux's C socket family |
582
|
|
|
|
|
|
|
|
583
|
|
|
|
|
|
|
=back |
584
|
|
|
|
|
|
|
|
585
|
|
|
|
|
|
|
=head1 AUTHOR |
586
|
|
|
|
|
|
|
|
587
|
|
|
|
|
|
|
Paul Evans |
588
|
|
|
|
|
|
|
|
589
|
|
|
|
|
|
|
=cut |
590
|
|
|
|
|
|
|
|
591
|
|
|
|
|
|
|
0x55AA; |