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UDP-DATAGRAM no longer checks peerport by default
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6 changed files with 102 additions and 8 deletions
doc
29
doc/socat.yo
29
doc/socat.yo
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@ -1088,7 +1088,7 @@ label(ADDRESS_UDP6_CONNECT)dit(bf(tt(UDP6:<host>:<port>)))
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label(ADDRESS_UDP_DATAGRAM)dit(bf(tt(UDP-DATAGRAM:<address>:<port>)))
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Sends outgoing data to the specified address which may in particular be a
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broadcast or multicast address. Packets arriving on the local socket are
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checked for the correct remote port and if their source addresses match
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checked for the correct remote port only when option link(sourceport)(OPTION_SOURCEPORT) is used (this is a change with Socat() version 1.7.4.0) and if their source addresses match
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link(RANGE)(OPTION_RANGE) or link(TCPWRAP)(OPTION_TCPWRAPPERS)
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options. This address type can for example be used for implementing
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symmetric or asymmetric broadcast or multicast communications.nl()
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@ -2260,6 +2260,20 @@ enddit()
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startdit()enddit()nl()
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label(GROUP_UDP)em(bf(UDP option group))
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This option may be applied to UDP datagram sockets.
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startdit()
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label(OPTION_UDP_IGNORE_PEERPORT)dit(bf(tt(udp-ignore-peerport>)))
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Address UDP-DATAGRAM expects incoming responses to come from the port
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specified in its second parameter. With this option, it accepts packets
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coming from any port.
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enddit()
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startdit()enddit()nl()
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label(GROUP_SCTP)em(bf(SCTP option group))
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These options may be applied to SCTP stream sockets.
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@ -2274,7 +2288,7 @@ enddit()
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startdit()enddit()nl()
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em(bf(UDP, TCP, and SCTP option groups))
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em(bf(UDP, TCP, and SCTP option group))
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Here we find options that are related to the network port mechanism and thus
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can be used with UDP, TCP, and SCTP client and server addresses.
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@ -2283,7 +2297,10 @@ label(OPTION_SOURCEPORT)dit(bf(tt(sourceport=<port>)))
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For outgoing (client) TCP and UDP connections, it sets the source
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link(<port>)(TYPE_PORT) using an extra code(bind()) call.
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With TCP or UDP listen addresses, socat immediately shuts down the
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connection if the client does not use this sourceport (link(example)(EXAMPLE_OPTION_SOURCEPORT)).
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connection if the client does not use this sourceport. UDP-RECV,
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UDP-RECVFROM, UDP-SENDTO, and UDP-DATAGRAM addresses ignore the packet when
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it does not match.
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(link(example)(EXAMPLE_OPTION_SOURCEPORT)).
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label(OPTION_LOWPORT)dit(bf(tt(lowport)))
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Outgoing (client) TCP and UDP connections with this option use
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an unused random source port between 640 and 1023 incl. On UNIX class operating
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@ -3452,6 +3469,12 @@ SOCAT_IP_DSTADDR: it contains the target address of the packet which may be a
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unicast, multicast, or broadcast address.
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label(EXAMPLE_SSD)
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dit(bf(tt(echo -e "M-SEARCH * HTTP/1.1\nHOST: 239.255.255.250:1900\nMAN: \"ssdp:discover\"\nMX: 4\nST: \"ssdp:all\"\n" |./socat - UDP-DATAGRAM:239.255.255.250:1900,crlf)))
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sends an SSDP (Simple Service Discovery Protocol) query to the local network
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and collects and outputs the answers received.
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dit(bf(tt()))
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