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SO_REUSEADDR per default on TCP LISTEN; so-reuseaddr=

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This commit is contained in:
Gerhard Rieger 2023-10-26 19:45:01 +02:00
parent b5640dd707
commit 2a9623d61c
9 changed files with 714 additions and 242 deletions

29
doc/socat.yo
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@ -586,7 +586,7 @@ label(ADDRESS_OPENSSL_LISTEN)dit(bf(tt(OPENSSL-LISTEN:<port>)))
link(range)(OPTION_RANGE),
link(tcpwrap)(OPTION_TCPWRAPPERS),
link(su)(OPTION_SUBSTUSER),
link(reuseaddr)(OPTION_REUSEADDR),
link(reuseaddr)(OPTION_SO_REUSEADDR),
link(retry)(OPTION_RETRY)nl()
See also:
link(OPENSSL)(ADDRESS_OPENSSL_CONNECT),
@ -652,7 +652,7 @@ label(ADDRESS_OPENSSL_DTLS_SERVER)dit(bf(tt(OPENSSL-DTLS-SERVER:<port>)))
link(range)(OPTION_RANGE),
link(tcpwrap)(OPTION_TCPWRAPPERS),
link(su)(OPTION_SUBSTUSER),
link(reuseaddr)(OPTION_REUSEADDR),
link(reuseaddr)(OPTION_SO_REUSEADDR),
link(retry)(OPTION_RETRY)nl()
link(rcvtimeo)(OPTION_SO_RCVTIMOE)nl()
See also:
@ -788,7 +788,7 @@ label(ADDRESS_SCTP_LISTEN)dit(bf(tt(SCTP-LISTEN:<port>)))
link(sctp-maxseg)(OPTION_SCTP_MAXSEG),
link(sctp-nodelay)(OPTION_SCTP_NODELAY),
link(su)(OPTION_SUBSTUSER),
link(reuseaddr)(OPTION_REUSEADDR),
link(reuseaddr)(OPTION_SO_REUSEADDR),
link(retry)(OPTION_RETRY)nl()
See also:
link(SCTP4-LISTEN)(ADDRESS_SCTP4_LISTEN),
@ -1053,7 +1053,7 @@ label(ADDRESS_TCP_LISTEN)dit(bf(tt(TCP-LISTEN:<port>)))
link(accept-timeout)(OPTION_ACCEPT_TIMEOUT),
link(mss)(OPTION_MSS),
link(su)(OPTION_SUBSTUSER),
link(reuseaddr)(OPTION_REUSEADDR),
link(reuseaddr)(OPTION_SO_REUSEADDR),
link(retry)(OPTION_RETRY),
link(cool-write)(OPTION_COOL_WRITE)nl()
See also:
@ -1413,7 +1413,7 @@ label(ADDRESS_VSOCK_LISTEN)dit(bf(tt(VSOCK-LISTEN:<port>)))
link(max-children)(OPTION_MAX_CHILDREN),
link(backlog)(OPTION_BACKLOG),
link(su)(OPTION_SUBSTUSER),
link(reuseaddr)(OPTION_REUSEADDR),
link(reuseaddr)(OPTION_SO_REUSEADDR),
link(retry)(OPTION_RETRY)nl()
See also:
link(VSOCK-CONNECT)(ADDRESS_VSOCK_CONNECT)
@ -2004,9 +2004,16 @@ label(OPTION_SO_RCVTIMOE)dit(bf(tt(so-rcvtimeo=<time>, rcvtimeo=<time>)))
label(OPTION_SO_SNDTIMOE)dit(bf(tt(so-sndtimeo=<time>, sndtimeo=<time>)))
Like link(so-recvtimeo)(OPTION_SO_RCVTIMOE), but for code(send). Not usecase
known.
label(OPTION_REUSEADDR)dit(bf(tt(reuseaddr)))
label(OPTION_RCVLOWAT)dit(bf(tt(rcvlowat=<bytes>)))
Specifies the minimum number of received bytes [link(int)(TYPE_INT)] until
the socket layer will pass the buffered data to socat().
label(OPTION_SO_REUSEADDR)dit(bf(tt(reuseaddr[=[0|1]])))
Allows other sockets to bind to an address even if parts of it (e.g. the
local port) are already in use by socat() (link(example)(EXAMPLE_OPTION_REUSEADDR)).
local port) are already in use by socat().nl()
With version 1.7.5, this socket option is set automatically for TCP LISTEN
addresses. If you prefer the system default (no related
tt(setsockopt(...SO_REUSEADDR...)) call at all), use form tt(reuseaddr=).nl()
(link(example)(EXAMPLE_OPTION_SO_REUSEADDR)).
label(OPTION_SNDBUF)dit(bf(tt(sndbuf=<bytes>)))
Sets the size of the send buffer after the code(socket()) call to
<bytes> [link(int)(TYPE_INT)].
@ -3295,7 +3302,7 @@ connection comes in, accepts it, then connects to the remote host
a second connection.
label(EXAMPLE_OPTION_BIND_TCP4)
label(EXAMPLE_OPTION_REUSEADDR)
label(EXAMPLE_OPTION_SO_REUSEADDR)
label(EXAMPLE_OPTION_FORK)
label(EXAMPLE_OPTION_SUBSTUSER)
label(EXAMPLE_OPTION_RANGE)
@ -3319,7 +3326,7 @@ link(fork)(OPTION_FORK)'ing a new
process after each code(accept()). It provides a little security by
link(su)(OPTION_SUBSTUSER)'ing to user
nobody after forking; it only permits connections from the private 10 network
(link(range)(OPTION_RANGE)); due to link(reuseaddr)(OPTION_REUSEADDR), it
(link(range)(OPTION_RANGE)); due to link(reuseaddr)(OPTION_SO_REUSEADDR), it
allows immediate restart after master process's termination, even if some child
sockets are not completely shut down.
With link(-lmlocal2)(option_lm), socat logs to stderr until successfully
@ -3512,7 +3519,7 @@ implements a simple network based message collector.
For each client connecting to port 3334, a new child process is generated (option link(fork)(OPTION_FORK)).
All data sent by the clients are link(append)(OPTION_APPEND)'ed to the file /tmp/in.log.
If the file does not exist, socat link(creat)(OPTION_O_CREAT)'s it.
Option link(reuseaddr)(OPTION_REUSEADDR) allows immediate restart of the server
Option link(reuseaddr)(OPTION_SO_REUSEADDR) allows immediate restart of the server
process.
COMMENT(
@ -3523,7 +3530,7 @@ For each client connecting to port 3335, a new child process is generated
(option link(fork)(OPTION_FORK)).
The contents of the file /tmp/motd is sent to each client.
Messages sent by clients result in an error due to option link(rdonly)(OPTION_RDONLY).
Option link(reuseaddr)(OPTION_REUSEADDR) allows immediate restart of the server
Option link(reuseaddr)(OPTION_SO_REUSEADDR) allows immediate restart of the server
process.
)
COMMENT(