####################### V 1.8.0.2: Security: Socat security advisory 9 CVE-2024-54661: Arbitrary file overwrite Socat 1.6.0.0 through 1.8.0.1 and version 2 distributions contain a wrapper script "readline.sh" that uses a predictable temporary directory, allowing unprivileged users to overwrite arbitrary files belonging to the scripts caller. This is fixed in Version 1.8.0.2 Mitigating factors: readline.sh is usually neither installed in a bin directory nor is it documented. Major Linux distributions install it in examples/ or doc/; however it is invoked by test.sh script. Thanks to Wolfgang Frisch from SuSE for finding and reporting this issue. Test: READLINE_SH_OVERWRITE ####################### V 1.8.0.1: Corrections: When no IP version was preferred by environment, option -4/-6, or address option pf, Socat version 1.8.0.0 address TCP-LISTEN did not accept TCP4 connections under BSD family operating systems, but only TCP6. To regain previous behaviour, preferring IP version 4 is now the default. This also fixes some other issues with bind and range options. Thanks to Mike Andrews for reporting this issue. Tests: LISTEN_4 LISTEN_6 V1800_*_RANGE V1800_*_BIND Added Socat option -0 to allow version 1.8.0.0 behaviour (no preferred IP version). UDP-SENDTO, UDPLITE-SENDTO, and IP-SENDTO addresses now select an IPv4 address in case the server name resolves to both IPv4 and IPv6 addresses. Tests: V1800_*_SENDTO_RESOLV_6_4 Guard applyopts_termios_value() with WITH_TERMIOS. Thanks to Kush Upadhyay from Amazon Bottlerocket team for providing the patch. In some situations xioclose() was called nested what could cause hanging of OpenSSL in pthread_rwlock_wrlock() socat 1.8.0.0 with addresses of type RECVFROM and option fork, where the second address failed to connect/open in the child process, entered a fork loop that was only stopped by FD exhaustion caused by FD leak. Test: RECVFROM_FORK_LOOP socat 1.8.0.0 had an FD leak with addresses of type RECVFROM with fork. Test: RECVFROM_FORK_LEAK With version 1.8.0.0, options ipv6-join-group and ipv6-join-source-group did not work. Thanks to Linus Luessing for reporting this bug. IP-SENDTO and option pf (protocol-family) with protocol name (vs.numeric argument) failed with message: E retropts_int(): trailing garbage in numerical arg of option "protocol-family" Test: IP_SENDTO_PF Fixed a possible buffer overrun with long log lines. In fact it does not write beyond end of buffer but lets pass excessive data to the write() function. Thanks to Heinrich Schuchardt from Canonical for reporting and sending a patch. Reworked domain name resolution, centralized IPv4/IPv6 sorting. Print warning about not checking CRLs in OpenSSL only in the first child process. Features: Total inactivity timeout option -T 0 now means 0.0 seconds; up to version 1.8.0.0 it meant no total inactivity timeout. Changed socat-chain.sh, socat-mux.sh, and socat-broker.sh to work with older Socat versions. socat-mux.sh and socat-broker.sh, when run as root, now internally use low (512..1023) UDP ports to increase security. Added option ai-all (sets AI_ALL flag of getaddrinfo() resolver) Socks5 now also allows syntax without socks port, and supports option socksport. Porting: Changes for building and testing on NetBSD New Linux distributions dislike egrep, fgrep When NETDB_INTERNAL is not available it should be set to -1. Thanks to Baruch Siach for sending a patch. On OpenSolaris/Illumos, isastream() is declared only in stropts.h, not in sys/stropts.h Thanks to Andy Fiddaman for sending a patch. On latest Illumos, compilation failed due to new unexpected SO_PROTOCOL implementation. Thanks to Andy Fiddaman for sending a patch. Building: Makefile.in: procan.o build requires srcdir prefix for explicit source file. Thanks to Hongxu Jia and Andrew Schoolman for providing patches. Makefile.in: the CC define for procan.o build failed when CC had more than one word. Thanks to Hongxu Jia for providing an inital patch. Testing: Added the optional DEVTESTS feature for developer tests with controlled name resolution to both IPv4 and IPV6 addresses: configure Socat with --enable-devtests, this provides internal resolution of domain dest-unreach.net with host names: localhost-4, localhost-6, localhost-4-6, and localhost-6-4 test.sh: lots of corrections and improvements test.sh: many hardcoded sleep values were replaced by much shorter values tuned to performance of the platform. test.sh -D for output of platform/system specific defines (variables) test.sh: fixed ss determination; more DEFS Documentation: Fixed a lot of typos. Thanks to Solomon Victorino for sending the patch. ####################### V 1.8.0.0: Security: Socats OpenSSL addresses do not (and never did) check certificate revocation lists (CRLs). Socat now prints a warning about this. Features: Added the --experimental option that enables use of features that might change in the future. Now warning messages are printed by default. If you want to see only errors and fatals as in previous versions, use option -d0; option -d4 is equivalent to -dddd and to -d -d -d -d The number of warnings has been reduced, e.g.removing a non existing file does in most cases no longer log a warning. Added address type internal SOCKETPAIR. This is similar to the unnamed PIPE address (only for internal echoing) but it provides datagram mode (the default) and thus keeps packet boundaries. Tests: SOCKETPAIR_STREAM SOCKETPAIR_DATAGRAM SOCKETPAIR_SEQPACKET SOCKETPAIR_BOUNDARIES New option -S controls catching and logging of signals that are not internally used by Socat. Tests: SIGTERM_NOLOG SIG31_LOG Added option ipv6-join-source-group. Thanks to Martin Buck and David Schweizer for sending patches. Added option http-version to PROXY-CONNECT address to support servers that are not able to handle HTTP version 1.0 Test: PROXY_HTTPVERSION Feature inspired by Robin Palotai. New options openssl-maxfraglen and openssl-maxsendfrag for functions/macros SSL_CTX_set_tlsext_max_fragment_length() and SSL_CTX_set_max_send_fragment(). Thanks to James Tavares for his contribution. Added Info log of resulting OpenSSL max fragment length. Implemented options rcvtimeo and sndtimeo, the first of which may be useful to prevent endlessly hanging DTLS connection etablishment. Test: RCVTIMEO_DTLS Feature proposed by Vladimir Nikishkin. The file names with -r and -R now may contain environment variable references. Test: VARS_IN_SNIFFPATH Socat option --statistics logs final byte and packet counter values before exit. Signal USR1 logs actual values. Tests: OPTION_STATISTICS SIGUSR1_STATISTICS Added option sitout-eio to specify a timerange in which EIO on the pty of a sub process is tolerated. Red Hat issue 1853102 related. Thanks to Jonathan Casiot for sending an initial patch. Socat now installs as socat1 and is referenced by symbolic link socat, same with man page (socat1.1 by socat.1) New option children-shutup[=1|2...] decreases severity of log messages in LISTEN and CONNECT type sub processes. Test: CHILDREN_SHUTUP New option retrieve-vlan for supporting VLANs in INTERFACE addresses: Linux normally keeps VLAN tags in outgoing raw packets, but appears to strip them from incoming packets and makes them available in PACKET_AUXDATA ancillary messages only. Up do version 1.7.4.5 Socat did not handle this situation, so the VLAN tags where effectively stripped off incoming packets. With this option Socat restores the VLAN tag. Feature inspired by Zhao Dong. Socket option SO_REUSEADDR is now automatically applied to TCP LISTEN addresses. reuseaddr= restores the old behaviour. Tests: TCP4_REUSEADDR OPENSSL_6_REUSEADDR REUSEADDR_NULL TCP based client addresses now try all results of name resolution until a connection attempt succeeded. Tests: TRY_ADDRS_4 TRY_ADDRS_4_6 Feature recommended by Anand Buddhdev. configure option --enable-default-ipv allows to specify at build time if IPv4, IPv6, or none of these is the preferred default; this is related to environment variables SOCAT_PREFERRED_RESOLVE_IP and SOCAT_DEFAULT_LISTEN_IP, and to Socat option -4, -6. Furthermore, mechanism of IPv4 vs.IPv6 selection has been reworked. When no IP version is preferred by these mechanism, passive Socat addresses (LISTEN, RECV, RECVFROM) default to IPv6 because it might support both versions (but checkout option ipv6-v6only). For client addresses, when one of these mechanisms applies and name resolution gives addresses of both IP versions, the addresses of the preferred versions are tried first. New option ai-addrconfig sets or unsets the AI_ADDRCONFIG flag of the resolver to prevent name resolution to address families that are not available in the network configuration. Default value is 1 in case the resolver does not get an address family hint. Flag AI_PASSIVE is now automatically applied for LISTEN, RECV, and RECVFROM type addresses, and with bind option. In addition to its application to the getaddrinfo() function, when this flag is set while no IP version is preferred by build, environment, option, or address type, Socat chooses IPv6 because this might activate both versions (but check option ipv6-v6only). Added option ai-passive to control this flag explicitely. New option ai-v4mapped (v4mapped) sets or unsets the AI_V4MAPPED flag of the resolver. For Socat addresses requiring IPv6 addresses, this resolves IPv4 addresses to the approriate IPv6 address [::ffff:*:*]. DNS resolver Options (res-*) are now set for the complete open phase of the address, not per getaddrinfo() invocation. Added the netns option that tries to open an address in the given network namespace. Tests: NETNS NETNS_EXEC New address ACCEPT-FD (ACCEPT) expects a listening file descriptor passed from parent, and accepts one or more connections for data transfer. This can be used with "inetd mode" of systemd. Test: ACCEPT_FD Added experimental socks5 TCP client support (connect,bind); syntax: SOCKS5-CONNECT:::: SOCKS5-LISTEN:::: Thanks to Charlie Svensson and others for contributions. New address types POSIXMQ-RECEIVE, POSIXMQ-READ, POSIXMQ-SEND, and POSIXMQ-BIDIRECTIONAL (Linux only, experimental), and option posixmq-priority Tests: LINUX_POSIXMQ_READ_PRIO LINUX_POSIXMQ_RECV_FORK LINUX_POSIXMQ_RECV_MAXCHILDREN LINUX_POSIXMQ_SEND_MAXCHILDREN New address SHELL invokes a shell but without the overhead of SYSTEM Added options res-retrans and res-retry that make use of undocumented resolver variables to set the retransmission time interval resp.the number of times to retransmit. Disable them and the old res-* opts with: ./configure --disable-resolve Added option res-nsaddr that overrides /etc/resolv.conf nameserver address based on an undocumented resolver feature. New option chdir changes the working directory of the address to the given path, only during the open stage. Tests: CHDIR_ON_CREATE CHDIR_ON_SYSTEM Option umask now applies only during opening of its very address, not for the lifetime of the process; the original umask is restored afterwards. Tests: UMASK_ON_CREATE UMASK_ON_SYSTEM Added option unix-bind-tempname (bind-tempname) to allow UNIX (and ABSTRACT) client addresses to bind to unique addresses even when invoked in forked off sub processes. Tests: UNIX_LISTEN_CONNECT_BIND_TEMPNAME UNIX_LISTEN_CLIENT_BIND_TEMPNAME UNIX_RECVFROM_CLIENT_BIND_TEMPNAME UNIX_RECVFROM_SENDTO_BIND_TEMPNAME ABSTRACT_LISTEN_CONNECT_BIND_TEMPNAME ABSTRACT_LISTEN_CLIENT_BIND_TEMPNAME ABSTRACT_RECVFROM_CLIENT_BIND_TEMPNAME ABSTRACT_RECVFROM_SENDTO_BIND_TEMPNAME Thanks to Kai Lüke for sending an initial patch. New option f-setpipe-sz (pipesz) sets the pipe size on systems that provide ioctl F_SETIPE_SZ. Filan prints the current value. Tests: STDIN_F_SETPIPE_SZ EXEC_F_SETPIPE_SZ Bidirectional PIPE addresses may block on writing a data chunk larger than pipe buffer. Socat now tries to detect if transfer block size is large enough and issues a warning. Added direct support of DCCP protocol, new addresses: DCCP-CONNECT (DCCP) DCCP-LISTEN (DCCP-L) DCCP4-CONNECT (DCCP4) DCCP4-LISTEN (DCCP4-L) DCCP6-CONNECT (DCCP6) DCCP6-LISTEN (DCCP6-L) New option: dccp-set-ccid (ccid) Support for UDP-Lite protocol, new addresses: UDPLITE-CONNECT UDPLITE-LISTEN UDPLITE-DATAGRAM UDPLITE-RECV UDPLITE-RECVFROM UDPLITE-SENDTO All these are also available in UDPLITE4-* and UDPLITE6-* form; options udplite-recv-cscov and udplite-send-cscov. Procan now prints info about CC and __STDC_VERSION__, about FD_SETSIZE, value of SO_PROTOCOL/SO_PROTOTYPE and some other defines, definitions of many C types, and the actual umask. Procan tries to find the name of the controlling terminal, on Linux it reads info from /proc/self/stat and searches for a device with matching major and minor numbers. Added socat-chain.sh that makes it possible to stack protocols, e.g. to drive socks through TLS, or to use TLS over a serial line. Tests: SOCAT_CHAIN_SOCKS4 SOCAT_CHAIN_SSL_PTY Added script socat-mux.sh that performs n-to-1 / 1-to-n communications using two Socat instances with multicasting. Tests: SOCAT_MUX Corrections: When a sub process (EXEC, SYSTEM) terminated with exit code other than 0, its last sent data might have been lost depending on timing of read/ write and SIGCHLD in Socat. Now the SIGCHLD handler does not simply terminate Socat in this case, but remembers the failure and allows further processing. Thanks to Luke Jones for reporting this issue. Now catching the case of empty SNI host to prevent OpenSSL error. This is related to Red Hat issue 2081414. Better formatted help output; address keywords in help output are now printed in uppercase. In previous Socat versions errors EPIPE and ECONNRESET on read() were handled at warning level, thus not automatically leading to termination with exit code 1. Beginning with this release these conditions are handled as errors with termination and exit code 1 to not pretend success on possible data loss. Problem reported by Scott Burkett. In previous Socat versions errors on shutdown() were ignored (info level). Now Socat handles EPIPE and ECONNRESET as errors to indicate possible failure of data transfer. INTERFACE addresses did not accept options of INTERFACE group (for historical reasons they were only available with TUN addresses). Opening addresses did not check if they support all directions expected by Socat. Now an error is printed when, e.g,, a read-only type address is opened for writing. A lot of minor corrections, e.g., catch readline() errors in filan, detect byte order in procan Test: EXEC_SIGINT OpenSSL cipherlist option did not override global openssl.cnf settings. Now SSL_CTX_set_cipher_list() is called before SSL_CTX_use_certificate_chain_file(). Thanks to Hiroshi Sakurai for reporting the problem and suggesting this solution. Fixed option sourceport with UDP6-DATAGRAM. Some client addresses (e.g. TCP-CONNECT) take the fork option for automatically spawning new connections, however the max-children option was not applied. Fixed the end-close option, it just did not work. In configure.ac was a direct call to gcc instead of $CC which broke cross compiling. Thanks to Fergus Dall for sending a patch. Coding: Introduced groups_t instead of uint32_t, for more flexibility. Rearranged option group bits to only require 32 bits on older systems. Make gcc happy, replace strncat with "manual" copying On addresses like UDP-RECVFROM with fork option every packet causes a new child process which then reads the packet. The parent process must wait until the packet has been read before checking again. The former synchronization mechanism using SIGUSR1 is now replaced by a socketpair. SIGUSR1 is no longer used for internal synchronization. Tests: UDP4_FORK UDP6_FORK UNIX_FORK Renamed xioopts_t to xioparms_t to avoid confusion with xioopts module. Moved multicast related code from xioopts.c to xio-ip.c and xio-ip6.c Pointers of type struct single are now always called sfd. Porting: Removed Config/ because its contents have not been maintained for many years. Try to not receive outgoing packets on raw (PF_PACKET) sockets - use PACKET_IGNORE_OUTGOING socket options when available. Test: INTERFACE_IGNOREOUTGOING Renewed port to OpenBSD: Guard OPENSSL_INIT_SETTINGS; and minor changes. Thanks to Paul Hunt for sending a fix of the configure --enable-openssl-base processing. Enable direct largefile support on "smaller" systems per _FILE_OFFSET_BITS and _LARGE_FILES. Thanks to Fergus Dall for sending a patch. Some corrections for better 32bit systems support. Testing: Removed obselete parts from test.sh test.sh: Introduced function checkcond Renamed test.sh option -foreign to -internet Documentation: Removed obselete file doc/xio.help Added doc for option ipv6-join-group (ipv6-add-membership) Thanks to Martin Buck for sending the patch. Renamed xiogetpacketsrc() to xiogetancillary() On bad parameter number now print syntax. ####################### V 1.7.4.5 (not released): Corrections: On connect() failure and in some other situations Socat tries to get detailled information about the error with recvmsg(). Error return of this function is now logged as Info instead of Warn. Tests of the correction of the "IP_ADD_SOURCE_MEMBERSHIP but not struct ip_mreq_source" issue left an #undef in xiosysincludes.h that disabled the ip-add-source-membership option. Thanks to Benjamin Poirier for sending a patch. Fixed a bug in dalan module that caused SIGSEGV in, e.g., SOCKET-LISTEN:1:1:'"/tmp/sock"' Test: DALAN_NO_SIGSEGV The retry option with some address types (TCP) did not close() the sockets after failed attempts, resulting in an FD leak. Filan: Corrected some syntax error messages Filan: Fixed a bug introduced in 1.7.4.4 that broke displaying TCP/UDP on options -s, -S Test: FILAN_SHORT_TCP Filan: If IP protocol type cannot be retrieved, display at least the socket type Filan: Fixed diag_set() call in filan_main.c, bug popped up with C23. Thanks to Cristian Rodríguez from openSUSE for reporting this issue. Querying the vsock Context Identifier (CID) requires an FD from opening /dev/vsock. Thanks to Volker Simonis for sending a patch. Fixed an internal FD leak in the EXEC,SYSTEM addresses. The FDs of the socketpair that queues messages from signal handlers lacked FD_CLOEXEC and thus leaked into EXEC and SYSTEM child processes. Option stderr on addresses EXEC and SYSTEM uses a temporary FD. It lacked the FD_CLOEXEC setting and thus leakt into child processes. Restoring of STDIO tty settings failed on Solaris type operating systems. Thanks to Gordon W.Ross for reporting and fixing this issue. Test: RESTORE_TTY The OpenSSL client SNI parameter, when not explicitely specified, is derived from option commonname or rom target server name. This is not useful with IP addresses, which Socat now checks and avoids. Socat options -L and -W create lock files using mkstemp(), so they had permissions 600. There does not seem to be a good reason for this restrictive mode. Furthermore Silla Rizzoli experienced that Minicom ignores lock files with mode 600, so it is set to 644 now. Procan tries to find out VSOCK CID only when running as root The mechanism for deferring logs from signal handlers had an issue that caused lots of unwanted recvfrom() calls. Do not try to remove abstract UNIX socket entries after use. Features: VSOCK, VSOCK-L support options pf, socktype, prototype (currently useless) Coding: New Environment variable SOCAT_TRANSFER_WAIT that Socat sleep before starting the data transfer loop. Useful, e.g., to accumulate multiple packets in a receiving datagram socket before starting to process them. "//" comments were used for disabling experimental code. These lines have now been removed or disabled in other ways to make Socat compile with C89/C90 standard again. fcntl() trace prints flags now in hexadecimal. Stream dump options -r and -R now open their pathes with CLOEXEC to prevent leaking into sub processes. Test: EXEC_SNIFF Stream dump write now warn on write errors and partial writes (but still do not recover). Removed trailing white space from *.h and *.c files. Porting: Small correction in configure.ac makes Socat C99 able. Thanks to Florian Weimer from Red Hat for providing a patch. Documentation: Syntax and semantics of some options (esp.unlink-close) were not clear. Thanks to Anthony Chavez for reporting this and making suggestions. socat-tun.html described TCP as tunnel medium but this does not keep packet boundaries. Changed to UDP. Added examples for DCCP client and server. Complex Socat examples are now displayed in two or three lines for better overview. dest-unreach.css stylesheet has been improved to support this. Testing: Idea: EXEC,SYSTEM addresses can keep packet boundaries when option socktype= Tests: EXECSOCKETPAIRPACKETS SYSTEMSOCKETPAIRPACKETS Cosmetic corrections of EXEC,SYSTEM tests. test.sh: Added option --expect-fail to specify comma separated list of test numbers whose failure shall not cause a failure of the whole script. test.sh: Added help text Speeded up wait loops; more addresses in upper case; more tests with command printing ($VERBOSE) test.sh: Check if ports are free before using them for tests Test EXEC_FDS checks with Filan if EXEC address only passes stdio FDs. Improved template; prepared namesFAIL, -d (DEBUG) ####################### V 1.7.4.4: Corrections: In error.c msg2() there was a stack overflow on long messages: The terminating \0 Byte was written behind the last position. Thanks to Martin Liška for sending the address sanitizer report. UDP-RECVFROM with fork sometimes terminated when multiple packets arrived. This issue was introduced with a bug fix in version 1.7.4.0. Reason was not handling EAGAIN on recvmsg(). Thanks to Jamie McQuillan for reporting this issue. Address TCP with options connect-timeout and retry terminated immediately when a connection attempt failed on network error or connection refused. Test: TCP_TIMEOUT_RETRY Thanks to Kamil Holubicki for reporting this issue. There were a couple of weaknesses and errors when accessing invalid or incompatible file system entries with UNIX domain, file, and generic addresses. For example, UNIX-CONNECT, when using a non matching socktype, failed with -1 and did not print an error message, instead of printing an error message and exiting with rc=1. Thanks to Paul Wise for reporting and analyzing the case of accessing a left over socket entry with GOPEN. The rawer option failed because it tried to clear CREAD. Test: RAWER UDP-SEND and UPD-SENDTO with option lowport always bound to port 1 instead of a free port in range 640..1023 Test: UDP_LOWPORT Fixed bad parser error message on "socat /tmp/x\"x/x -" Tightened syntax checks to detect numerical arguments that are missing or have trailing garbage. Test: INTEGER_GARBAGE ctype(3) functions need there arguments to be unsigned char. Thanks to Taylor R Campbell for sending a patch. Filan library uses Socats diag/error message system and therefore had always the signal handler messages socket pair open. This fix avoids this socketpair in standalone Filan. Corrected printf format for type socklen_t in two places. Porting: OpenSSL, at least 1.1 on Ubuntu, crashed with SIGSEGV under certain conditions: client connection to server with certificate with empty subject, and pressing ^C after successful connect. This crash is now prevented by setting OPENSSL_INIT_NO_ATEXIT. Thanks to Martin Dorey for reporting and analyzing this issue, and for providing an environment for reproduction. Socat failed to compile on platforms that have IP_ADD_SOURCE_MEMBERSHIP but not struct ip_mreq_source Thanks to Justin Yackoski for sending a patch. configure.ac's detection of getprotobynumber_r() variant did not recognize if this function does not exist, e.g. on Musl libc. Thanks to Alexander Kanavin and Baruch Siach for sending patches. Corrected message format when no strftime() is available; improved handling of very long host or program names Solaris requires that termios options are always applied to the slave side of PTY. Fixed ancillary messages on Solaris. Filan: Solaris has the open file path infos in /proc//path/ Thanks to Andy Fiddaman for directing me to the patch. Filan now recognizes and prints Solaris doors and event ports. Solaris derivatives no longer need librt for clock_gettime() Thanks to Andy Fiddaman for directing me to the patch. LibreSSL does not have OPENSSL_INIT_new(). This function is now guarded. Socat might build with LibreSSL. Thanks to Orbea for reporting and helping. Building: Failure during building documentation, e.g. due to missing Yodl packages, now does not let the build process fail. Feature requested by Seyhun. Features: Filan prints target of symlink when appropriate Test: FILANSYMLINK VSOCK-LISTEN now generates environment variables SOCAT_PEERADDR, SOCAT_PEERPORT, SOCAT_SOCKADDR, SOCAT_SOCKPORT New address aliases VSOCK, VSOCK-L Documentation: Fixed typo in doc/socat-tun.html and link in README. Thanks to William Suthers for reporting. Fixed hard coded path in docu examples. Thanks to Jakub Wilk for sending a patch. Updated doc/socat-openssltunnel.html: 2048 bits, commonname Testing: Unset SOCAT_MAIN_WAIT on informational Socat calls SOCAT=socat used ./socat instead of the version derived by $PATH Do not try VSOCK_ECHO test when feature is not compiled in. Fixed logging of test 220 TUNINTERFACE Musl libc refuses to execve() shell scripts, 2 tests needed to be adapted. Musl libc has FOPEN_MAX=1000 which made bash dumping core on test EXCEED_FOPEN_MAX. Added tests for failures of UNIX socket and GOPEN accesses to non matching file system entries. Tests: CONNECT_TO_MISSING CONNECT_TO_DENIED CONNECT_TO_DIRECTORY CONNECT_TO_ORPHANED CONNECT_TO_FILE CONNECT_TO_DGRAM CONNECT_TO_SEQPACKET SEND_TO_MISSING SEND_TO_DENIED SEND_TO_DIRECTORY SEND_TO_ORPHANED SEND_TO_FILE SEND_TO_STREAM SEND_TO_SEQPACKET SENDTO_TO_MISSING SENDTO_TO_DENIED SENDTO_TO_DIRECTORY SENDTO_TO_ORPHANED SENDTO_TO_FILE SENDTO_TO_STREAM SENDTO_TO_SEQPACKET SEQPACKET_TO_MISSING SEQPACKET_TO_DENIED SEQPACKET_TO_DIRECTORY SEQPACKET_TO_ORPHANED SEQPACKET_TO_FILE SEQPACKET_TO_STREAM SEQPACKET_TO_DGRAM UNIX_TO_MISSING UNIX_TO_DENIED UNIX_TO_DIRECTORY UNIX_TO_FILE UNIX_TO_ORPHANED GOPEN_TO_DENIED GOPEN_TO_DIRECTORY GOPEN_TO_ORPHANED On RHEL-9 SCTP support requires installation of package kernel-modules-extra. test.sh now detects when SCTP is missing in kernel and reacts with warnings instead of errors. VSOCK loopback still does not seem to work even in kernel 5.13, so just issue warning on "No such device". ####################### V 1.7.4.3: Corrections: Socat crashed with SIGSEGV when peer presented a certificate without (or empty?) subject. Thanks to Martin Dorey for reporting this issue and sending a patch. Socat 1.7.4.2 did not compile on OmniOS (and probably other OpenSolaris distributions) Thanks to Andy Fiddaman for sending a patch. Socat since 1.7.4.0 did not compile on Solaris and its derivatives because the getprotobynumber_r() function prototype differ from the Linux version. configure now checks for the variant. Thanks to Robert Zybeck for reporting this issue. The variable for the no-sni option was not initialized and could thus break OpenSSL certificate verification. E.g., test OPENSSL_SNI on some platform succeeded with -g but failed with -O compiler option. Thanks to valgrind for quickly finding the cause. Porting: Again porting Socat to AIX (7.1) - Fixed configure and compile issues: Adapted include requirements for IPv6 Guarded MSG_DONTWAIT Continued porting Socat to AIX-7.1 - Fixed some runtime errors: UNIX domain sockets of type SEQPACKET are not available. Connecting to UNIX datagram socket fails with EPROTONOSUPPORT (vs. EPROTOTYPE on most other OSes). Streams: Must not push ldterm when it is already active (hangs). Building: Socats build date and time may now be set externally with environment variable SOURCE_DATE_EPOCH. Thanks to Viktor Kleinik for sending a patch. Building Socat in a sub directory failed. Now the following works even for the docu parts: mkdir -p myos; cd myos; ../configure && make; cd .. Thanks to Jon Ringle for sending a patch. Testing: test.sh: many corrections for AIX's older shell utilities, e.g.sleep(1) does not allow fractions of seconds, grep does not understand '\<'; OpenIndiana/SunOS netstat format; many more functional and cosmetic code corrections. Documentation: The socktype option was documented unspecifically as type option. Thanks to Jonas Metzger for the hint. ####################### V 1.7.4.2: Corrections: The per address parameters for OpenSSL overlapped in memory with socket parameters. Magically this did not seem to cause problems except on MacOS Catalina that reported errors like: socat[3458] E Select(7, &0x80, NULL, NULL, {140392884396544.000000}): Invalid argument Test: OPENSSL_PARA_OVERLAP Thanks to Ryo Ota for reporting this bug. Fixed a few minor coding issues A VSOCK warning message was generated with all listening addresses instead of only with VSOCK-LISTEN When an OPENSSL-CONNECT client presented a certificate with IPv6 subject alternate name and the OPENSSL-LISTEN server had no commonname option, the server crashed with SIGSEGV in xioip6_pton(). Test: OPENSSL_CLIENT_IP6_CN Red Hat bug 1981308 Thanks to Vlad Slepukhin for reporting this issue and providing a patch Corrected a typo in configure.ac that broke option --enable-openssl-base Thanks to john1doe for reporting this issue. Socat looped endlessly, not responding to SIGTERM, when a service name (for port) could not be resolved. Test: BAD_SERVICE Using options of NAMED group, e.g.chown, with abstract UNIX domain sockets, produced errors because the function was applied with a normal file system related call, e.g.chown(), using file "" (empty name). Instead of chown(), Socat now uses fchown() on the file descriptor. However, such a call usually has no real effect. Test: ABSTRACT_USER Thanks to Andreas Fink for reporting this issue. Option -R did not only dump ("sniff") right-to-left, but also left-to-right traffic to the given file. Test: SNIFF_RIGHT_TO_LEFT Thanks to 1314 gsf for reporting this bug and sending a patch. Options -r and -R, when opening a named pipe that has no actual reader, failed with "No such device or address". To solve this problem, Socat now opens the pipe in rw-Mode. Thanks to Cody J.Soultz for sending a patch. The call "socat -r - PIPE" traced to file ./- instead of issuing a syntax error. Print a message when readbytes option causes EOF The ip-recverr option had no effect. Corrected and improved its handling of ancilliary messages, so it is able to analyze ICMP error packets (Linux only?) Setgui(), Setuid() calls in xio-progcall.c were useless. Testing: Prevent the TIMESTAMP tests from sporadically failing due do seconds overflow Fixed in test.sh a few issues reported by shellcheck Documentation: Added missing docu of OpenSSL options min-proto-version, max-proto-version. Added missing closing parenthesis in socat.yo. Thanks to Emanuele Torre for reporting this issue. Corrected more typos and added missing bug info to CHANGES, performed some non functional corrections. Porting: Corrected building when clock_gettime() not available, with or without gettimeofday(). ####################### V 1.7.4.1: Corrections: Socat 1.7.4.0 failed to compile especially on 32 bit systems. Thanks to Wang Mingyu and others for sending a patch or reporting this issue. Under certain conditions OpenSSL stream connections, in particular bulk data transfer in unidirectional mode, failed during transfer or near its with Connection reset by peer on receiver side. This happened with Socat versions 1.7.3.3 to 1.7.4.0. Reasons were lazy SSL shutdown handling on the sender side in combination with SSL_MODE_AUTO_RETRY turned off. Fix: After SSH_shutdown but before socket shutdown call SSL_read() Test: OPENSSL_STREAM_TO_SERVER Fixes Red Hat issue 1870279. ####################### V 1.7.4.0: Security: Buffer size option (-b) is internally doubled for CR-CRLF conversion, but not checked for integer overflow. This could lead to heap based buffer overflow, assuming the attacker could provide this parameter. Test: BLKSIZE_INT_OVERFL Thanks to Lê Hiếu Bùi for reporting this issue and sending an example exploit. Corrections: Socats address parser read over end of string when there were unbalanced quotes Test: UNBALANCED_QUOTE Removed unused usleep() call from sycls.c Unsetenv() was conditional in sysutils.c but not in xio-openssl.c thus building failed on Solaris 9. Thanks to Greg Earle for reporting this issue and providing a patch. Mitigated race condition of quickly terminating SYSTEM or EXEC child processes. Option o-direct might require alignment of read/write buffer to, e.g., 512 bytes, Socat now takes care of this when allocating the buffer. With this fix read() succeeds, however, write() still might fail when not writing complete pages. Test: O_DIRECT There was a race condition in the way Socat UDP-RECVFROM and similar addresses with option fork prevents one packet from triggering multiple processes. The symptom was that Socat master process seemed to hang and did not process further packets. The fix makes use of pselect() system call. Thanks to Fulvio Scapin for reporting this issue. UNIX domain client addresses applied file system entry options (group NAMED) to the server socket instead of the client (bind) socket entry. Tests: UNIX_SENDTO_UNLINK UNIX_CONNECT_UNLINK Thanks to Nico Williams for reporting this major issue. Length of single address options was limited to 511 bytes. This value is now increased to 2047 bytes. Change suggested by Mario Camou. Addresses of type RECVFROM with option fork looped with an error message in case that the second address failed before consuming the packet. The fix makes RECVFROM drop the packet when the second address failed before reading it. Use retry or forever option with the second address if you want to avoid data loss. Fixes Red Hat bug 1907718 Thanks to Chunmei Xu for reporting this issue and proving the patch. Socats DTLS implementation has been reworked and appears to work now reasonably over UDP. New addresses: OPENSSL-DTLS-SERVER (DTLS-L), OPENSSL-DTLS-CLIENT (DTLS) Tests: OPENSSL_DTLS_CLIENT OPENSSL_DTLS_SERVER OPENSSL_METHOD_DTLS1 OPENSSL_METHOD_DTLS1.2 Thanks to Brandon Carpenter, Qing Wan, and Pavel Nakonechnyi for sending patches. filan did not output the socket protocol. filan -s assumed each stream socket to be TCP and each datagram socket to be UDP. Now it uses SO_PROTOCOL and getprotoent() for correct output. Help text showed two parameters for UDP4-RECVFROM address, but only is allowed. Thanks to John the Scott for reporting this issue. Error messages from SSL_read() and SSL_write() sometimes stated SSL_connect instead of originating function name. Fixed some more non functional minor issues. Porting: In gcc version 10 the default changed from -fcommon to -fno-common. Consequently, linking filan and procan failed with error "multiple definition of `deny_severity'" and `allow_severity' Fixed by removing definitions in filan.c and procan.c Debian issue 957823 Thanks to László Böszörményi and others for reporting this issue. Solaris 9 does not provide strndup(); added substitute code. Thanks to Greg Earle for providing a patch. Added configure option --enable-openssl-base to specify the location of a non-OS OpenSSL installation There are systems whose kernel understands SCTP but getaddrinfo does not. As workaround after EIA_SOCKTYPE on name and service resolution fall back to ai_socktype=0; if it fails with EAI_SERVICE, set ai_protocol=0 and try again Test: SCTP_SERVICENAME Per file filesystem options were still named ext2-* and depended on . Now they are called fs-* and depend on . These fs-* options are also available on old systems with ext2_fs.h New options openssl-min-proto-version (min-version) and openssl-max-proto-version (max-version) give access to the related OpenSSL set-macros and substitute deprecated version-specific methods. Test: OPENSSL_MIN_VERSION With OpenSSL use OPENSSL_init_SSL when available, instead of deprecated SSL_library_init. With OPENSSL_API_COMPAT=0x10000000L the files openssl/dh.h, openssl/bn.h must explicitely be included. Thanks to Rosen Penev for reporting and sending a patch. Testing: test.sh now produces a list of tests that could not be performed for any reason. This helps to analyse these cases. OpenSSL s_server appearently started to neglect TCPs half close feature. Test OPENSSL_TCP4 has been changed to tolerate this. OpenSSL changed its behaviour when connection is rejected. Tests OPENSSLCERTSERVER, OPENSSL_CN_CLIENT_SECURITY, and OPENSSL_CN_SERVER_SECURITY now tolerate this. OpenSSL no longer allows explicit renegotiation with TLSv1.3, thus the appropriate tests failed. Fix: use TLSv1.2 for renegotiation tests Tests: OPENSSLRENEG1 OPENSSLRENEG2 Ubuntu 20.04 requires 2048 bit certificates with OpenSSL Archlinux 2020 has not which command; its ip,ss commands have modified version strings More testing issues solved: * ss to pipe might omit column separator * UDP6MULTICAST_UNIDIR fails on newer Linux kernels * do not use sort -V * renamed testaddrs() to testfeats(), and introduced new testaddrs() New features: GOPEN and UNIX-CLIENT addresses now support sockets of type SEQPACKET. Test: GOPENUNIXSEQPACKET Feature suggested by vi0oss. The generic setsockopt-int and related options are, in case of listening/accepting addresses, applied to the connected socket(s). To enable setting options on the listening socket, a new option setsockopt-listen has been implemented. See the documentation for info on data types. Tests: SETSOCKOPT SETSOCKOPT_LISTEN Thanks to Steven Danna and Korian Edeline for reporting this issue. Filan option -S gives short description like -s but with improved format Socat OpenSSL client, when server was specified using IP address, did not verify connection on certificates SubjectAltName IP entries. Tests: OPENSSL_SERVERALTAUTH OPENSSL_SERVERALTIP4AUTH OPENSSL_SERVERALTIP6AUTH Fixes Red Hat bug 1805132 Added options -r and -R for raw dump of transferred data to files. Test: OPTION_RAW_DUMP Added option ip-transparent (socket option IP_TRANSPARENT) Thanks to Wang Shanker for sending a patch. OPENSSL-CONNECT now automatically uses the SNI feature, option openssl-no-sni turns it off. Option openssl-snihost overrides the value of option openssl-commonname or the server name. Tests: OPENSSL_SNI OPENSSL_NO_SNI Thanks to Travis Burtrum for providing the initial patch New option accept-timeout (listen-timeout) Test: ACCEPTTIMEOUT Proposed by Roland New option ip-add-source-membership Feature inspired by Brian (b f31415) INCOMPATIBLE CHANGE: Address UDP-DATAGRAM now does not check peerport of replies, as it did up to version 1.7.3.4. Use option sourceport when you need the old behaviour. Test: UDP_DATAGRAM_SOURCEPORT Feature inspired by Hans Bueckler for SSDP inquiry (for UPnP) New option proxy-authorization-file reads PROXY-CONNECT credentials from file and makes it possible to hide this data from the process table. Test: PROXYAUTHFILE Thanks to Charles Stephens for sending an initial patch. Added AF_VSOCK support with VSOCK-CONNECT and VSOCK-LISTEN addresses. Developed by Stefano Garzarella. Coding: Added printf formats for uint16_t etc. Documentation: Address UDP-RECV does not support option fork. Thanks to Fulvio Scapin for reporting that mistake in docu. TUN address documentation showed TCP for backend which may merge consecutive packets which causes data loss. Thanks to Tomasz Lakota for reporting this issue. ####################### V 1.7.3.4: Corrections: Header of xiotermios_speed() declared parameter unsigned int instead of speed_t, thus compiling failed on MacOS Thanks to Joe Strout and others for reporting this bug. Thanks to Andrew Childs and others for sending a patch. Under certain circumstances, termios options of the first address were applied to the second address, resulting in error "Inappropriate ioctl for device" This affected version 1.7.3.3 only. Test: TERMIOS_PH_ALL Thanks to Ivan J. for reporting this issue. Socat failed to compile when no poll() system call was found by configure. Thanks to Jason White for sending a patch. Due to use of SSL_CTX_clear_mode() Socat failed to compile on old systems with, e.g., OpenSSL-0.9.8. Thanks to Simon Matter and Moritz B. for reporting this problem and sending initial patches. getaddrinfo() in IP4-SENDTO and IP6-SENDTO addresses failed with "ai_socktype not supported" when protocol 6 was addressed. The fix removes the possibility to use service names with SCTP. Test: IP_SENDTO_6 Thanks to Sören for sending an initial patch. Under certain circumstances, Socat printed the "socket ... is at EOF" multiple times. Test: MULTIPLE_EOF Newer parts of test.sh used substitutions ${x,,*} or ${x^^*} that are not implemented in older bash versions. ####################### V 1.7.3.3: Corrections: Makefile.in did not specify dependencies of filan on vsnprintf_r.o and snprinterr.o Added definition of FILAN_OBJS Thanks to Craig Leres, Clayton Shotwell, and Chris Packham for providing patches. configure option --enable-msglevel did not work with numbers The autoconf mechanism for determining SHIFT_OFFSET did not work when cross compiling. Thanks to Max Freisinger from Gentoo for sending a patch. Socat still depended on obsolete gethostbyname() function, thus compiling with MUSL libc failed. Problem reported by Kennedy33. The async signal safe diagnostic system used FDs 3 and 4 internally, so use of appropriate fdin or fdout led to failures. Test: DIAG_FDIN Problem reported by Onur Sentürk. The socket based mechanism for passing messages and signal information from signal handler to process could reach and kill the wrong process. Introduces functions diag_sock_pair(), diag_fork() Thanks to Darren Zhao for analysing and reporting this problem. Option ipv6-join-group did not work because it was applied in the wrong phase Test: UDP6MULTICAST_UNIDIR Thanks to Angus Gratton for sending a patch. Setting ispeed and ospeed failed for some serial devices because the two settings were applied with two different get/set cycles, Thanks to Alexandre Fenyo for providing an initial patch. However, the actual fix is part of a conceptual change of the termios module that aims for applying all changes in a single tcsetattr call. Fixes FreeBSD Bug 198441 Termios options TAB0,TAB1,TAB2,TAB3, and XTABS did not have an effect. Thanks to Alan Walters for reporting this bug. Substituted cumbersom ISPEED_OFFSET mechanism for cfsetispeed() calls With TCP6-LISTEN and the other passive IPv6 addresses the range option just failed: due to a bug in the syntax parser and two more bugs in the xiocheckrange_ip6() function. The syntax has now been changed from "[::1/128]" to "[::1]/128"! Thanks Leah Neukirchen for sending an initial fix. For name resolution Socat only checked the first character of the host name to decide if it is an IPv4 address. This was not RFC conform. This fix removes the possibility for use of IPv4 addresses with IPv6, e.g. TCP6:127.0.0.1:80 Debian issue 695885 Thanks to Nicolas Fournil for reporting this issue. Print a useful error message when single character options appear to be merged in Socat invocation Test: SOCAT_OPT_HINT Fixed some docu typos. Thanks to Travis Wellman, Thomas , Dan Kenigsberg, Julian Zinn, and Simon Matter Porting: OpenSSL functions TLS1_client_method() and similar are deprecated. Socat now uses recommended TLS_client_method(). The old functions and dependend option openssl-method can still be used when configuring socat with --enable-openssl-method Shell scripts in socat distribution are now headed with: #! /usr/bin/env bash to make them better portable to systems without /bin/bash Thanks to Maya Rashish for sending a patch RES_AAONLY, RES_PRIMARY are deprecated. You can still enable them with configure option --enable-res-deprecated. New versions of OpenSSL preset SSL_MODE_AUTO_RETRY which may hang socat. Solution: clear SSL_MODE_AUTO_RETRY when it is set. Renamed configure.in to configure.ac and set an appropriate symlink for older environments. Related Gentoo bug 426262: Warning on configure.in Thanks to Francesco Turco for reporting that warning. Fixed new IPv6 range code for platforms without s6_addr32 component. Testing: test.sh: Show a warning when phase-1 (insecure phase) of a security test fails OpenSSL tests failed on actual Linux distributions. Measures: Increased key lengths from 768 to 1024 bits Added test.sh option -C to delete temp certs from prevsious runs Provide DH-parameter in certificate in PEM OpenSSL s_server option -verify 0 must be omitted OpenSSL authentication method aNULL no longer works Failure of cipher aNULL is not a failure Failure of methods SSL3 and SSL23 is desired test.sh depended on ifconfig and netstat utilities which are no longer availabie in some distributions. test.sh now checks for and prefers ip and ss. Thanks to Ruediger Meier for reporting this problem. More corrections to test.sh: Language settings could still influence test results netstat was still required Suppress usleep deprecated messag Force use of IPv4 with some certificates Set timeout for UDPxMAXCHILDREN tests Git: Added missing Config/Makefile.DragonFly-2-8-2, Config/config.DragonFly-2-8-2.h Removed testcert.conf (to be generated by test.sh) Cosmetics: Simplified handling of missing termios defines. New features: Permit combined -d options as -dd etc. porting: ext2 options are now fs options. ####################### V 1.7.3.2: corrections: SIGSEGV and other signals could lead to a 100% CPU loop Failing name resolution could lead to SIGSEGV Thanks to Max for reporting this issue. Include for ptrdiff_t Thanks to Jeroen Roovers for reporting this issue. Building with --disable-sycls failed due to missing sslcls.h defines Socat hung when configured with --disable-sycls. Some minor corrections with includes etc. Option so-reuseport did not work. Thanks to Some Raghavendra Prabhu for sending a patch. Programs invoked with EXEC, nofork, and -u or -U had stdin and stdout incorrectly assigned Test: EXEC_NOFORK_UNIDIR Thanks to David Reiss for reporting this problem. Socat exited with status 0 even when a program invoked with SYSTEM or EXEC failed. Tests: SYSTEM_RC EXEC_RC Issue reported by Felix Winkelmann. AddressSanitizer reported a few buffer overflows (false positives). Nevertheless fixed Socat source. Issue reported by Hanno Böck. Socat did not use option ipv6-join-group. Test: USE_IPV6_JOIN_GROUP Thanks to Linus Lüssing for sending a patch. UDP-LISTEN did not honor the max-children option. Test: UDP4MAXCHILDREN UDP6MAXCHILDREN Thanks to Leander Berwers for reporting this issue. Options so-rcvtimeo and so-sndtimeo do not work with poll()/select() and therefore were useless. Thanks to Steve Borenstein for reporting this issue. Option dhparam was documented as dhparams. Added the alias name dhparams to fix this. Thanks to Alexander Neumann for sending a patch. Options shut-down and shut-close did not work. Thanks to Stefan Schimanski for providing a patch. There was a bug in printing readline log message caused by a misleading indentation. Thanks to Paul Wouters for reporting. The internal vsnprintf_r function looped or crashed on size parameter with hexadecimal output. Ignore exit code of child process when it was killed by master due to EOF Corrected byte order on read of IPV6_TCLASS value from ancillary message Fixed type of the bool element in options. This had bug caused failures e.g. of ignoreeof on big-endian systems when bool was not based on int. On systems with predefined bool type whose size differs from int some IPv6 and TCP options (per setsockopt()) failed. Length of integral data in ancillary messages varies (TOS: 1 byte, TTL: 4 bytes), the old implementation failed for TTL on big-endian hosts. Fixed an issue in options processing: TUN and DNS flags had failed on big-endian systems and the NO- forms had probable never worked. porting: Type conflict between int and sig_atomic_t between declaration and definition of diag_immediate_type and diag_immediate_exit broke compilation on FreeBSD 10.1 with clang. Thanks to Emanuel Haupt for reporting this bug. Socat failed to compile on platforms with OpenSSL without DTLSv1_client_method or DTLSv1_server_method. Thanks to Simon Matter for sending a patch. NuttX OS headers do not provide struct ip, thus socat did not compile. Made struct ip subject to configure. Thanks to SP for reporting this issue. Socat failed to compile with OpenSSL version 1.0.2d where SSLv3_server_method and SSLv3_client_method are no longer defined. Thanks to Mischa ter Smitten for reporting this issue and providing a patch. configure checked for OpenSSL EC_KEY assuming it is a define but it is a type, thus OpenSSL ECDHE ciphers failed even on Linux. Thanks to Andrey Arapov for reporting this bug. Changes to make socat compile with OpenSSL 1.1. Thanks to Sebastian Andrzej Siewior e.a. from the Debian team for providing the base patch. Debian Bug#828550 Make Socat compatible with BoringSSL. Thanks to Matt Braithwaite for providing a patch. OpenSSL: Use RAND_status to determine PRNG state Thanks to Adam Langley for providing a patch AIX-7 uses an extended O_ACCMODE that does not fit socat's internal requirements. Thanks to Garrick Trowsdale for providing a patch LibreSSL support: check for OPENSSL_NO_COMP Thanks to Bernard Spil for providing a patch testing: socks4echo.sh and socks4a-echo.sh hung with new bash with read -n test.sh: stderr; option -v (verbose); FDOUT_ERROR description improved proxy.sh - it now also takes hostnames A few corrections in test.sh DTLS1 test hangs on some distributions. Test is now only performed with OpenSSL 1.0.2 or higher. More corrections to test.sh that reveal a mistake with IPV6_TCLASS docu: Corrected source of socat man page to correctly show man references like socket(2); removed obseolete entries from See Also Docu and some comments mentioned addresses SSL-LISTEN and SSL-CONNECT that do not exist (OPENSSL-LISTEN, SSL-L; and OPENNSSL-CONNECT, SSL are correct). Thanks to Zhigang Wang for reporting this issue. Fixed a couple of English spelling and grammar mistakes. Thanks to Jakub Wild for sending the patches. NOEXPAND() was not resolved 2 times. More minor docu corrections legal: Added contributors to copyright notices. Suggested by Matt Braithwaite. ####################### V 1.7.3.1: security: Socat security advisory 8 A stack overflow in vulnerability was found that can be triggered when command line arguments (complete address specifications, host names, file names) are longer than 512 bytes. Successful exploitation might allow an attacker to execute arbitrary code with the privileges of the socat process. This vulnerability can only be exploited when an attacker is able to inject data into socat's command line. A vulnerable scenario would be a CGI script that reads data from clients and uses (parts of) this data as hostname for a Socat invocation. Test: NESTEDOVFL Credits to Takumi Akiyama for finding and reporting this issue. Socat security advisory 7 MSVR-1499 In the OpenSSL address implementation the hard coded 1024 bit DH p parameter was not prime. The effective cryptographic strength of a key exchange using these parameters was weaker than the one one could get by using a prime p. Moreover, since there is no indication of how these parameters were chosen, the existence of a trapdoor that makes possible for an eavesdropper to recover the shared secret from a key exchange that uses them cannot be ruled out. Futhermore, 1024bit is not considered sufficiently secure. Fix: generated a new 2048bit prime. Thanks to Santiago Zanella-Beguelin and Microsoft Vulnerability Research (MSVR) for finding and reporting this issue. ####################### V 1.7.3.0: security: Socat security advisory 6 CVE-2015-1379: Possible DoS with fork Fixed problems with signal handling caused by use of not async signal safe functions in signal handlers that could freeze socat, allowing denial of service attacks. Many changes in signal handling and the diagnostic messages system were applied to make the code async signal safe but still provide detailled logging from signal handlers: Coded function vsnprintf_r() as async signal safe incomplete substitute of libc vsnprintf() Coded function snprinterr() to replace %m in strings with a system error message Instead of gettimeofday() use clock_gettime() when available Pass Diagnostic messages from signal handler per unix socket to the main program flow Use sigaction() instead of signal() for better control Turn off nested signal handler invocations Thanks to Peter Lobsinger for reporting and explaining this issue. Red Hat issue 1019975: add TLS host name checks OpenSSL client checks if the server certificates names in extensions/subjectAltName/DNS or in subject/commonName match the name used to connect or the value of the openssl-commonname option. Test: OPENSSL_CN_CLIENT_SECURITY OpenSSL server checks if the client certificates names in extensions/subjectAltNames/DNS or subject/commonName match the value of the openssl-commonname option when it is used. Test: OPENSSL_CN_SERVER_SECURITY Red Hat issue 1019964: socat now uses the system certificate store with OPENSSL when neither options cafile nor capath are used Red Hat issue 1019972: needs to specify OpenSSL cipher suites Default cipherlist is now "HIGH:-NULL:-PSK:-aNULL" instead of empty to prevent downgrade attacks new features: OpenSSL addresses set couple of environment variables from values in peer certificate, e.g.: SOCAT_OPENSSL_X509_SUBJECT, SOCAT_OPENSSL_X509_ISSUER, SOCAT_OPENSSL_X509_COMMONNAME, SOCAT_OPENSSL_X509V3_SUBJECTALTNAME_DNS Tests: ENV_OPENSSL_{CLIENT,SERVER}_X509_* Added support for methods TLSv1, TLSv1.1, TLSv1.2, and DTLS1 Tests: OPENSSL_METHOD_* Enabled OpenSSL server side use of ECDHE ciphers. Feature suggested by Andrey Arapov. Added a new option termios-rawer for ptys. Thanks to Christian Vogelgsang for pointing me to this requirement corrections: Bind with ABSTRACT commands used non-abstract namespace (Linux). Test: ABSTRACT_BIND Thanks to Denis Shatov for reporting this bug. Fixed return value of nestlex() Option ignoreeof on the right address hung. Test: IGNOREEOF_REV Thanks to Franz Fasching for reporting this bug. Address SYSTEM, when terminating, shut down its parent addresses, e.g. an SSL connection which the parent assumed to still be active. Test: SYSTEM_SHUTDOWN Passive (listening or receiving) addresses with empty port field bound to a random port instead of terminating with error. Test: TCP4_NOPORT configure with some combination of disable options produced config files that failed to compile due to missing IPPROTO_TCP. Thanks to Thierry Fournier for report and patch. fixed a few minor bugs with OpenSSL in configure and with messages Socat did not work in FIPS mode because 1024 instead of 512 bit DH prime is required. Thanks to Zhigang Wang for reporting and sending a patch. Christophe Leroy provided a patch that fixes memory leaks reported by valgrind Help for filan -L was bad, is now corrected to: "follow symbolic links instead of showing their properties" Address options fdin and fdout were silently ignored when not applicable due to -u or -U option. Now these combinations are caught as errors. Test: FDOUT_ERROR Issue reported by Hendrik. Added option termios-cfmakeraw that calls cfmakeraw() and is preferred over option raw which is now obsolote. On SysV systems this call is simulated by appropriate setting. Thanks to Youfu Zhang for reporting issue with option raw. porting: Socat included instead of POSIX Thanks to John Spencer for reporting this issue. Version 1.7.2.4 changed the check for gcc in configure.ac; this broke cross compiling. The particular check gets reverted. Thanks to Ross Burton and Danomi Manchego for reporting this issue. Debian Bug#764251: Set the build timestamp to a deterministic time: support external BUILD_DATE env var to allow to build reproducable binaries Joachim Fenkes provided an new adapted spec file. Type bool and macros Min and Max are defined by socat which led to compile errors when they were already provided by build framework. Thanks to Liyu Liu for providing a patch. David Arnstein contributed a patch for NetBSD 5.1 including stdbool.h support and appropriate files in Config/ Lauri Tirkkonen contributed a patch regarding netinet/if_ether.h on Illumos Changes for Openindiana: define _XPG4_2, __EXTENSIONS__, _POSIX_PTHREAD_SEMANTICS; and minor changes Red Hat issue 1182005: socat 1.7.2.4 build failure missing linux/errqueue.h Socat failed to compile on on PPC due to new requirements for including and a weakness in the conditional code. Thanks to Michel Normand for reporting this issue. doc: In the man page the PTY example was badly formatted. Thanks to J.F.Sebastian for sending a patch. Added missing CVE ids to security issues in CHANGES testing: Do not distribute testcert.conf with socat source but generate it (and new testcert6.conf) during test.sh run. ####################### V 1.7.2.4: corrections: LISTEN based addresses applied some address options, e.g. so-keepalive, to the listening file descriptor instead of the connected file descriptor Thanks to Ulises Alonso for reporting this bug make failed after configure with non gcc compiler due to missing include. Thanks to Horacio Mijail for reporting this problem configure checked for --disable-rawsocket but printed --disable-genericsocket in the help text. Thanks to Ben Gardiner for reporting and patching this bug In xioshutdown() a wrong branch was chosen after RECVFROM type addresses. Probably no impact. Thanks to David Binderman for reporting this issue. procan could not cleanly format ulimit values longer than 16 decimal digits. Thanks to Frank Dana for providing a patch that increases field width to 24 digits. OPENSSL-CONNECT with bind option failed on some systems, eg.FreeBSD, with "Invalid argument" Thanks to Emile den Tex for reporting this bug. Changed some variable definitions to make gcc -O2 aliasing checker happy Thanks to Ilya Gordeev for reporting these warnings On big endian platforms with type long >32bit the range option applied a bad base address. Thanks to hejia hejia for reporting and fixing this bug. Red Hat issue 1022070: missing length check in xiolog_ancillary_socket() Red Hat issue 1022063: out-of-range shifts on net mask bits Red Hat issue 1022062: strcpy misuse in xiosetsockaddrenv_ip4() Red Hat issue 1022048: strncpy hardening: corrected suspicious strncpy() uses Red Hat issue 1021958: fixed a bug with faulty buffer/data length calculation in xio-ascii.c:_xiodump() Red Hat issue 1021972: fixed a missing NUL termination in return string of sysutils.c:sockaddr_info() for the AF_UNIX case fixed some typos and minor issues, including: Red Hat issue 1021967: formatting error in manual page UNIX-LISTEN with fork option did not remove the socket file system entry when exiting. Other file system based passive address types had similar issues or failed to apply options umask, user e.a. Thanks to Lorenzo Monti for pointing me to this issue porting: Red Hat issue 1020203: configure checks fail with some compilers. Use case: clang Performed changes for Fedora release 19 Adapted, improved test.sh script Red Hat issue 1021429: getgroupent fails with large number of groups; use getgrouplist() when available instead of sequence of calls to getgrent() Red Hat issue 1021948: snprintf API change; Implemented xio_snprintf() function as wrapper that tries to emulate C99 behaviour on old glibc systems, and adapted all affected calls appropriately Mike Frysinger provided a patch that supports long long for time_t, socklen_t and a few other libc types. Artem Mygaiev extended Cedril Priscals Android build script with pty code The check for fips.h required stddef.h Thanks to Matt Hilt for reporting this issue and sending a patch Check for linux/errqueue.h failed on some systems due to lack of linux/types.h inclusion. Thanks to Michael Vastola for sending a patch. autoconf now prefers configure.ac over configure.in Thanks to Michael Vastola for sending a patch. type of struct cmsghdr.cmsg is system dependend, determine it with configure; some more print format corrections docu: libwrap always logs to syslog added actual text version of GPLv2 ####################### V 1.7.2.3: security: Socat security advisory 5 CVE-2014-0019: socats PROXY-CONNECT address was vulnerable to a buffer overflow with data from command line (see socat-secadv5.txt) Credits to Florian Weimer of the Red Hat Product Security Team ####################### V 1.7.2.2: security: Socat security advisory 4 CVE-2013-3571: after refusing a client connection due to bad source address or source port socat shutdown() the socket but did not close() it, resulting in a file descriptor leak in the listening process, visible with lsof and possibly resulting in EMFILE Too many open files. This issue could be misused for a denial of service attack. Full credits to Catalin Mitrofan for finding and reporting this issue. ####################### V 1.7.2.1: security: Socat security advisory 3 CVE-2012-0219: fixed a possible heap buffer overflow in the readline address. This bug could be exploited when all of the following conditions were met: 1) one of the addresses is READLINE without the noprompt and without the prompt options. 2) the other (almost arbitrary address) reads malicious data (which is then transferred by socat to READLINE). Workaround: when using the READLINE address apply option prompt or noprompt. Full credits to Johan Thillemann for finding and reporting this issue. ####################### V 1.7.2.0: corrections: when UNIX-LISTEN was applied to an existing file it failed as expected but removed the file. Thanks to Bjoern Bosselmann for reporting this problem fixed a bug where socat might crash when connecting to a unix domain socket using address GOPEN. Thanks to Martin Forssen for bug report and patch. UDP-LISTEN would alway set SO_REUSEADDR even without fork option and when user set it to 0. Thanks to Michal Svoboda for reporting this bug. UNIX-CONNECT did not support half-close. Thanks to Greg Hughes who pointed me to that bug TCP-CONNECT with option nonblock reported successful connect even when it was still pending address option ioctl-intp failed with "unimplemented type 26". Thanks to Jeremy W. Sherman for reporting and fixing that bug socat option -x did not print packet direction, timestamp etc; thanks to Anthony Sharobaiko for sending a patch address PTY does not take any parameters but did not report an error when some were given Marcus Meissner provided a patch that fixes invalid output and possible process crash when socat prints info about an unnamed unix domain socket Michal Soltys reported the following problem and provided an initial patch: when socat was interrupted, e.g. by SIGSTOP, and resumed during data transfer only parts of the data might have been written. Option o-nonblock in combination with large transfer block sizes may result in partial writes and/or EAGAIN errors that were not handled properly but resulted in data loss or process termination. Fixed a bug that could freeze socat when during assembly of a log message a signal was handled that also printed a log message. socat development had been aware that localtime() is not thread safe but had only expected broken messages, not corrupted stack (glibc 2.11.1, Ubuntu 10.4) an internal store for child pids was susceptible to pid reuse which could lead to sporadic data loss when both fork option and exec address were used. Thanks to Tetsuya Sodo for reporting this problem and sending a patch OpenSSL server failed with "no shared cipher" when using cipher aNULL. Fixed by providing temporary DH parameters. Thanks to Philip Rowlands for drawing my attention to this issue. UDP-LISTEN slept 1s after accepting a connection. This is not required. Thanks to Peter Valdemar Morch for reporting this issue fixed a bug that could lead to error or socat crash after a client connection with option retry had been established fixed configure.in bug on net/if.h check that caused IF_NAMESIZE to be undefined improved dev_t print format definition porting: Cedril Priscal ported socat to Android (using Googles cross compiler). The port includes the socat_buildscript_for_android.sh script added check for component ipi_spec_dst in struct in_pktinfo so compilation does not fail on Cygwin (thanks to Peter Wagemans for reporting this problem) build failed on RHEL6 due to presence of fips.h; configure now checks for fipsld too. Thanks to Andreas Gruenbacher for reporting this problem check for netinet6/in6.h only when IPv6 is available and enabled don't fail to compile when the following defines are missing: IPV6_PKTINFO IPV6_RTHDR IPV6_DSTOPTS IPV6_HOPOPTS IPV6_HOPLIMIT Thanks to Jerry Jacobs for reporting this problem (Mac OS X Lion 10.7) check if define __APPLE_USE_RFC_2292 helps to enable IPV6_* (MacOSX Lion 7.1); thanks to Jerry Jacobs to reporting this problem and proposing a solution fixed compiler warnings on Mac OS X 64bit. Thanks to Guy Harris for providing the patch. corrections for OpenEmbedded, especially termios SHIFT values and ISPEED/OSPEED. Thanks to John Faith for providing the patch minor corrections to docu and test.sh resulting from local compilation on Openmoko SHR fixed sa_family_t compile error on DragonFly. Thanks to Tony Young for reporting this issue and sending a patch. Ubuntu Oneiric: OpenSSL no longer provides SSLv2 functions; libutil.sh is now bsd/libutil.h; compiler warns on vars that is only written to new features: added option max-children that limits the number of concurrent child processes. Thanks to Sam Liddicott for providing the patch. Till Maas added support for tun/tap addresses without IP address added an option openssl-compress that allows to disable the compression feature of newer OpenSSL versions. Thanks to Michael Hanselmann for providing this contribution (sponsored by Google Inc.) docu: minor corrections in docu (thanks to Paggas) client process -> child process ####################### V 1.7.1.3: security: Socat security advisory 2 CVE-2010-2799: fixed a stack overflow vulnerability that occurred when command line arguments (whole addresses, host names, file names) were longer than 512 bytes. Note that this could only be exploited when an attacker was able to inject data into socat's command line. Full credits to Felix Gröbert, Google Security Team, for finding and reporting this issue ####################### V 1.7.1.2: corrections: user-late and group-late, when applied to a pty, affected the system device /dev/ptmx instead of the pty (thanks to Matthew Cloke for pointing me to this bug) socats openssl addresses failed with "nonblocking operation did not complete" when the peer performed a renegotiation. Thanks to Benjamin Delpy for reporting this bug. info message during socks connect showed bad port number on little endian systems due to wrong byte order (thanks to Peter M. Galbavy for bug report and patch) Debian bug 531078: socat execs children with SIGCHLD ignored; corrected to default. Thanks to Martin Dorey for reporting this bug. porting: building socat on systems that predefined the CFLAGS environment to contain -Wall failed (esp.RedHat). Thanks to Paul Wouters for reporting this problem and to Simon Matter for providing the patch support for Solaris 8 and Sun Studio support (thanks to Sebastian Kayser for providing the patches) on some 64bit systems a compiler warning "cast from pointer to integer of different size" was issued on some option definitions added struct sockaddr_ll to union sockaddr_union to avoid "strict aliasing" warnings (problem reported by Paul Wouters) docu: minor corrections in docu ####################### V 1.7.1.1: corrections: corrected the "fixed possible SIGSEGV" fix because SIGSEGV still might occur under those conditions. Thanks to Toni Mattila for first reporting this problem. ftruncate64 cut its argument to 32 bits on systems with 32 bit long type socat crashed on systems without setenv() (esp. SunOS up to Solaris 9); thanks to Todd Stansell for reporting this bug with unidirectional EXEC and SYSTEM a close() operation was performed on a random number which could result in hanging e.a. fixed a compile problem caused by size_t/socklen_t mismatch on 64bit systems docu mentioned option so-bindtodev but correct name is so-bindtodevice. Thanks to Jim Zimmerman for reporting. docu changes: added environment variables example to doc/socat-multicast.html ####################### V 1.7.1.0: new features: address options shut-none, shut-down, and shut-close allow to control socat's half close behaviour with address option shut-null socat sends an empty packet to the peer to indicate EOF option null-eof changes the behaviour of sockets that receive an empty packet to see EOF instead of ignoring it introduced option names substuser-early and su-e, currently equivalent to option substuser (thanks to Mike Perry for providing the patch) corrections: fixed some typos and improved some comments ####################### V 1.7.0.1: corrections: fixed possible SIGSEGV in listening addresses when a new connection was reset by peer before the socket addresses could be retrieved. Thanks to Mike Perry for sending a patch. fixed a bug, introduced with version 1.7.0.0, that let client connections with option connect-timeout fail when the connections succeeded. Thanks to Bruno De Fraine for reporting this bug. option end-close "did not apply" to addresses PTY, SOCKET-CONNECT, and most UNIX-* and ABSTRACT-* half close of EXEC and SYSTEM addresses did not work for pipes and sometimes socketpair help displayed for some option a wrong type under some circumstances shutdown was called multiple times for the same fd ####################### V 1.7.0.0: new features: new address types SCTP-CONNECT and SCTP-LISTEN implement SCTP stream mode for IPv4 and IPv6; new address options sctp-maxseg and sctp-nodelay (suggested by David A. Madore; thanks to Jonathan Brannan for providing an initial patch) new address "INTERFACE" for transparent network interface handling (suggested by Stuart Nicholson) added generic socket addresses: SOCKET-CONNECT, SOCKET-LISTEN, SOCKET-SENDTO, SOCKET-RECVFROM, SOCKET-RECV, SOCKET-DATAGRAM allow protocol independent socket handling; all parameters are explicitely specified as numbers or hex data added address options ioctl-void, ioctl-int, ioctl-intp, ioctl-string, ioctl-bin for generic ioctl() calls. added address options setsockopt-int, setsockopt-bin, and setsockopt-string for generic setsockopt() calls option so-type now only affects the socket() and socketpair() calls, not the name resolution. so-type and so-prototype can now be applied to all socket based addresses. new address option "escape" allows to break a socat instance even when raw terminal mode prevents ^C etc. (feature suggested by Guido Trotter) socat sets environment variables SOCAT_VERSION, SOCAT_PID, SOCAT_PPID for use in executed scripts socat sets environment variables SOCAT_SOCKADDR, SOCAT_SOCKPORT, SOCAT_PEERADDR, SOCAT_PEERPORT in LISTEN type addresses (feature suggested by Ed Sawicki) socat receives all ancillary messages with each received packet on datagram related addresses. The messages are logged in raw form with debug level, and broken down with info level. note: each type of ancillary message must be enabled by appropriate address options. socat provides the contents of ancillary messages received on RECVFROM addresses in appropriate environment variables: SOCAT_TIMESTAMP, SOCAT_IP_DSTADDR, SOCAT_IP_IF, SOCAT_IP_LOCADDR, SOCAT_IP_OPTIONS, SOCAT_IP_TOS, SOCAT_IP_TTL, SOCAT_IPV6_DSTADDR, SOCAT_IPV6_HOPLIMIT, SOCAT_IPV6_TCLASS the following address options were added to enable ancillary messages: so-timestamp, ip-pktinfo (not BSD), ip-recvdstaddr (BSD), ip-recverr, ip-recvif (BSD), ip-recvopts, ip-recvtos, ip-recvttl, ipv6-recvdstopts, ipv6-recverr, ipv6-recvhoplimit, ipv6-recvhopopts, ipv6-recvpathmtu, ipv6-recvpktinfo, ipv6-recvrthdr, ipv6-recvtclass new address options ipv6-tclass and ipv6-unicast-hops set the related socket options. STREAMS (UNIX System V STREAMS) can be configured with the new address options i-pop-all and i-push (thanks to Michal Rysavy for providing a patch) corrections: some raw IP and UNIX datagram modes failed on BSD systems when UDP-LISTEN continued to listen after packet dropped by, e.g., range option, the old listen socket would not be closed but a new one created. open sockets could accumulate. there was a bug in ip*-recv with bind option: it did not bind, and with the first received packet an error occurred: socket_init(): unknown address family 0 test: RAWIP4RECVBIND RECVFROM addresses with FORK option hung after processing the first packet. test: UDP4RECVFROM_FORK corrected a few mistakes that caused compiler warnings on 64bit hosts (thanks to Jonathan Brannan e.a. for providing a patch) EXEC and SYSTEM with stderr injected socat messages into the data stream. test: EXECSTDERRLOG when the EXEC address got a string with consecutive spaces it created additional empty arguments (thanks to Olivier Hervieu for reporting this bug). test: EXECSPACES in ignoreeof polling mode socat also blocked data transfer in the other direction during the 1s wait intervalls (thanks to Jorgen Cederlof for reporting this bug) corrected alphabetical order of options (proxy-auth) some minor corrections improved test.sh script: more stable timing, corrections for BSD replaced the select() calls by poll() to cleanly fix the problems with many file descriptors already open socat option -lf did not log to file but to stderr socat did not compile on Solaris when configured without termios feature (thanks to Pavan Gadi for reporting this bug) porting: socat compiles and runs on AIX with gcc (thanks to Andi Mather for his help) socat compiles and runs on Cygwin (thanks to Jan Just Keijser for his help) socat compiles and runs on HP-UX with gcc (thanks to Michal Rysavy for his help) socat compiles and runs on MacOS X (thanks to Camillo Lugaresi for his help) further changes: filan -s prefixes output with FD number if more than one FD Makefile now supports datarootdir (thanks to Camillo Lugaresi for providing the patch) cleanup in xio-unix.c ####################### V 1.6.0.1: new features: new make target "gitclean" docu source doc/socat.yo released corrections: exec:...,pty did not kill child process under some circumstances; fixed by correcting typo in xio-progcall.c (thanks to Ralph Forsythe for reporting this problem) service name resolution failed due to byte order mistake (thanks to James Sainsbury for reporting this problem) socat would hang when invoked with many file descriptors already opened fix: replaced FOPEN_MAX with FD_SETSIZE thanks to Daniel Lucq for reporting this problem. fixed bugs where sub processes would become zombies because the master process did not catch SIGCHLD. this affected addresses UDP-LISTEN, UDP-CONNECT, TCP-CONNECT, OPENSSL, PROXY, UNIX-CONNECT, UNIX-CLIENT, ABSTRACT-CONNECT, ABSTRACT-CLIENT, SOCKSA, SOCKS4A (thanks to Fernanda G Weiden for reporting this problem) fixed a bug where sub processes would become zombies because the master process caught SIGCHLD but did not wait(). this affected addresses UDP-RECVFROM, IP-RECVFROM, UNIX-RECVFROM, ABSTRACT-RECVFROM (thanks to Evan Borgstrom for reporting this problem) corrected option handling with STDIO; usecase: cool-write configure --disable-pty also disabled option waitlock fixed small bugs on systems with struct ip_mreq without struct ip_mreqn (thanks to Roland Illig for sending a patch) corrected name of option intervall to interval (old form still valid for us German speaking guys) corrected some print statements and variable names make uninstall did not uninstall procan fixed lots of weaknesses in test.sh corrected some bugs and typos in doc/socat.yo, EXAMPLES, C comments further changes: procan -c prints C defines important for socat added test OPENSSLEOF for OpenSSL half close ####################### V 1.6.0.0: new features: new addresses IP-DATAGRAM and UDP-DATAGRAM allow versatile broadcast and multicast modes new option ip-add-membership for control of multicast group membership new address TUN for generation of Linux TUN/TAP pseudo network interfaces (suggested by Mat Caughron); associated options tun-device, tun-name, tun-type; iff-up, iff-promisc, iff-noarp, iff-no-pi etc. new addresses ABSTRACT-CONNECT, ABSTRACT-LISTEN, ABSTRACT-SENDTO, ABSTRACT-RECV, and ABSTRACT-RECVFROM for abstract UNIX domain addresses on Linux (requested by Zeeshan Ali); option unix-tightsocklen controls socklen parameter on system calls. option end-close for control of connection closing allows FD sharing by sub processes range option supports form address:mask with IPv4 changed behaviour of OPENSSL-LISTEN to require and verify client certificate per default options f-setlkw-rd, f-setlkw-wr, f-setlk-rd, f-setlk-wr allow finer grained locking on regular files uninstall target in Makefile (lack reported by Zeeshan Ali) corrections: fixed bug where only first tcpwrap option was applied; fixed bug where tcpwrap IPv6 check always failed (thanks to Rudolf Cejka for reporting and fixing this bug) filan (and socat -D) could hang when a socket was involved corrected PTYs on HP-UX (and maybe others) using STREAMS (inspired by Roberto Mackun) correct bind with udp6-listen (thanks to Jan Horak for reporting this bug) corrected filan.c peekbuff[0] which did not compile with Sun Studio Pro (thanks to Leo Zhadanovsky for reporting this problem) corrected problem with read data buffered in OpenSSL layer (thanks to Jon Nelson for reporting this bug) corrected problem with option readbytes when input stream stayed idle after so many bytes fixed a bug where a datagram receiver with option fork could fork two sub processes per packet further changes: moved documentation to new doc/ subdir new documents (kind of mini tutorials) are provided in doc/ ####################### V 1.5.0.0: new features: new datagram modes for udp, rawip, unix domain sockets socat option -T specifies inactivity timeout rewrote lexical analysis to allow nested socat calls addresses tcp, udp, tcp-l, udp-l, and rawip now support IPv4 and IPv6 socat options -4, -6 and environment variables SOCAT_DEFAULT_LISTEN_IP, SOCAT_PREFERRED_RESOLVE_IP for control of protocol selection addresses ssl, ssl-l, socks, proxy now support IPv4 and IPv6 option protocol-family (pf), esp. for openssl-listen range option supports IPv6 - syntax: range=[::1/128] option ipv6-v6only (ipv6only) new tcp-wrappers options allow-table, deny-table, tcpwrap-etc FIPS version of OpenSSL can be integrated - initial patch provided by David Acker. See README.FIPS support for resolver options res-debug, aaonly, usevc, primary, igntc, recurse, defnames, stayopen, dnsrch options for file attributes on advanced filesystems (ext2, ext3, reiser): secrm, unrm, compr, ext2-sync, immutable, ext2-append, nodump, ext2-noatime, journal-data etc. option cool-write controls severeness of write failure (EPIPE, ECONNRESET) option o-noatime socat option -lh for hostname in log output traffic dumping provides packet headers configure.in became part of distribution socats unpack directory now has full version, e.g. socat-1.5.0.0/ corrected docu of option verify corrections: fixed tcpwrappers integration - initial fix provided by Rudolf Cejka exec with pipes,stderr produced error setuid-early was ignored with many address types some minor corrections ####################### V 1.4.3.1: corrections: PROBLEM: UNIX socket listen accepted only one (or a few) connections. FIX: do not remove listening UNIX socket in child process PROBLEM: SIGSEGV when TCP part of SSL connect failed FIX: check ssl pointer before calling SSL_shutdown In debug mode, show connect client port even when connect fails ####################### V 1.4.3.0: new features: socat options -L, -W for application level locking options "lockfile", "waitlock" for address level locking (Stefan Luethje) option "readbytes" limits read length (Adam Osuchowski) option "retry" for unix-connect, unix-listen, tcp6-listen (Dale Dude) pty symlink, unix listen socket, and named pipe are per default removed after use; option unlink-close overrides this new behaviour and also controls removal of other socat generated files (Stefan Luethje) corrections: option "retry" did not work with tcp-listen EPIPE condition could result in a 100% CPU loop further changes: support systems without SHUT_RD etc. handle more size_t types try to find makedepend options with gcc 3 (richard/OpenMacNews) ####################### V 1.4.2.0: new features: option "connect-timeout" limits wait time for connect operations (requested by Giulio Orsero) option "dhparam" for explicit Diffie-Hellman parameter file corrections: support for OpenSSL DSA certificates (Miika Komu) create install directories before copying files (Miika Komu) when exiting on signal, return status 128+signum instead of 1 on EPIPE and ECONNRESET, only issue a warning (Santiago Garcia Mantinan) -lu could cause a core dump on long messages further changes: modifications to simplify using socats features in applications ####################### V 1.4.1.0: new features: option "wait-slave" blocks open of pty master side until a client connects, "pty-intervall" controls polling option -h as synonym to -? for help (contributed by Christian Lademann) filan prints formatted time stamps and rdev (disable with -r) redirect filan's output, so stdout is not affected (contributed by Luigi Iotti) filan option -L to follow symbolic links filan shows termios control characters corrections: proxy address no longer performs unsolicited retries filan -f no longer needs read permission to analyze a file (but still needs access permission to directory, of course) porting: Option dsusp FreeBSD options noopt, nopush, md5sig OpenBSD options sack-disable, signature-enable HP-UX, Solaris options abort-threshold, conn-abort-threshold HP-UX options b900, b3600, b7200 Tru64/OSF1 options keepinit, paws, sackena, tsoptena further corrections: address pty now uses ptmx as default if openpty is also available ####################### V 1.4.0.3: security: Socat security advisory 1 CVE-2004-1484: fix to a syslog() based format string vulnerability that can lead to remote code execution. See advisory socat-adv-1.txt ####################### V 1.4.0.2: corrections: exec'd write-only addresses get a chance to flush before being killed error handler: print notice on error-exit filan printed wrong file type information ####################### V 1.4.0.1: corrections: socks4a constructed invalid header. Problem found, reported, and fixed by Thomas Themel, by Peter Palfrader, and by rik with nofork, don't forget to apply some process related options (chroot, setsid, setpgid, ...) ####################### V 1.4.0.0: new features: simple openssl server (ssl-l), experimental openssl trust new options "cafile", "capath", "key", "cert", "egd", and "pseudo" for openssl new options "retry", "forever", and "intervall" option "fork" for address TCP improves `gender changer´ options "sigint", "sigquit", and "sighup" control passing of signals to sub process (thanks to David Shea who contributed to this issue) readline takes respect to the prompt issued by the peer address options "prompt" and "noprompt" allow to override readline's new default behaviour readline supports invisible password with option "noecho" socat option -lp allows to set hostname in log output socat option -lu turns on microsecond resolution in log output corrections: before reading available data, check if writing on other channel is possible tcp6, udp6: support hostname specification (not only IP address), and map IP4 names to IP6 addresses openssl client checks server certificate per default support unidirectional communication with exec/system subprocess try to restore original terminal settings when terminating test.sh uses tmp dir /tmp/$USER/$$ instead of /tmp/$$ socks4 failed on platforms where long does not have 32 bits (thanks to Peter Palfrader and Thomas Seyrat) hstrerror substitute wrote wrong messages (HP-UX, Solaris) proxy error message was truncated when answer contained multiple spaces porting: compiles with AIX xlc, HP-UX cc, Tru64 cc (but might not link) ####################### V 1.3.2.2: corrections: PROXY CONNECT failed when the status reply from the proxy server contained more than one consecutive spaces. Problem reported by Alexandre Bezroutchko do not SIGSEGV when proxy address fails to resolve server name udp-listen failed on systems where AF_INET != SOCK_DGRAM (e.g. SunOS). Problem reported by Christoph Schittel test.sh only tests available features added missing IP and TCP options in filan analyzer do not apply stdio address options to both directions when in unidirectional mode on systems lacking /dev/*random and egd, provide (weak) entropy from libc random() porting: changes for HP-UX (VREPRINT, h_NETDB_INTERNAL) compiles on True64, FreeBSD (again), NetBSD, OpenBSD support for long long as st_ino type (Cygwin 1.5) compile on systems where pty can not be featured ####################### V 1.3.2.1: corrections: "final" solution for the ENOCHLD problem corrected "make strip" default gcc debug/opt is "-O" again check for /proc at runtime, even if configure found it src.rpm accidently supported SuSE instead of RedHat ####################### V 1.3.2.0: new features: option "nofork" connects an exec'd script or program directly to the file descriptors of the other address, circumventing the socat transfer engine support for files >2GB, using ftruncate64(), lseek64(), stat64() filan has new "simple" output style (filan -s) porting: options "binary" and "text" for controlling line termination on Cygwin file system access (hint from Yang Wu-Zhou) fix by Yang Wu-Zhou for the Cygwin "No Children" problem improved support for OSR: _SVID3; no IS_SOCK, no F_GETOWN (thanks to John DuBois) minor corrections to avoid warnings with gcc 3 further corrections and minor improvements: configure script is generated with autoconf 2.57 (no longer 2.52) configure passes CFLAGS to Makefile option -??? for complete list of address options and their short forms program name in syslog messages is derived from argv[0] SIGHUP now prints notice instead of error EIO during read of pty now gives Notice instead of Error, and triggers EOF use of hstrerror() for printing resolver error messages setgrent() got required endgrent() ####################### V 1.3.1.0: new features: integration of Wietse Venema's tcpwrapper library (libwrap) with "proxy" address, option "resolve" controls if hostname or IP address is sent in request option "lowport" establishes limited authorization for TCP and UDP connections improvement of .spec file for RPM creation (thanks to Gerd v. Egidy) An accompanying change in the numbering scheme results in an incompatibility with earlier socat RPMs! solved problems and bugs: PROBLEM: socat daemon terminated when the address of a connecting client did not match range option value instead of continue listening SOLVED: in this case, print warning instead of error to keep daemon active PROBLEM: tcp-listen with fork sometimes left excessive number of zombie processes SOLVED: dont assume that each exiting child process generates SIGCHLD when converting CRNL to CR, socat converted to NL further corrections: configure script now disables features that depend on missing files making it more robust in "unsupported" environments server.pem permissions corrected to 600 "make install" now does not strip; use "make strip; make install" if you like strip (suggested by Peter Bray) ####################### V 1.3.0.1: solved problems and bugs: PROBLEM: OPENSSL did not apply tcp, ip, and socket options SOLVED: OPENSSL now correctly handles the options list PROBLEM: CRNL to NL and CRNL to CR conversions failed when CRNL crossed block boundary SOLVED: these conversions now simply strip all CR's or NL's from input stream porting: SunOS ptys now work on x86, too (thanks to Peter Bray) configure looks for freeware libs in /pkgs/lib/ (thanks to Peter Bray) further corrections: added WITH_PROXY value to -V output added compile dependencies of WITH_PTY and WITH_PROXY -?? did not print option group of proxy options corrected syntax for bind option in docu corrected an issue with stdio in unidirectional mode options socksport and proxyport support service names ftp.sh script supports proxy address man page no longer installed with execute permissions (thanks to Peter Bray) fixed a malloc call bug that could cause SIGSEGV or false "out of memory" errors on EXEC and SYSTEM, depending on program name length and libc. ####################### V 1.3.0.0: new features: proxy connect with optional proxy authentication combined hex and text dump mode, credits to Gregory Margo address pty applies options user, group, and perm to device solved problems and bugs: PROBLEM: option reuseport was not applied (BSD, AIX) SOLVED: option reuseport now in phase PASTSOCKET instead of PREBIND, credits to Jean-Baptiste Marchand PROBLEM: ignoreeof with stdio was ignored SOLVED: ignoreeof now works correctly with address stdio PROBLEM: ftp.sh did not use user supplied password SOLVED: ftp.sh now correctly passes password from command line PROBLEM: server.pem had expired SOLVED: new server.pem valid for ten years PROBLEM: socks notice printed wrong port on some platforms SOLVED: socks now uses correct byte-order for port number in notice further corrections: option name o_trunc corrected to o-trunc combined use of -u and -U is now detected and prevented made message system a little more robust against format string attacks ####################### V 1.2.0.0: new features: address pty for putting socat behind a new pseudo terminal that may fake a serial line, modem etc. experimental openssl integration (it does not provide any trust between the peers because is does not check certificates!) options flock-ex, flock-ex-nb, flock-sh, flock-sh-nb to control all locking mechanism provided by flock() options setsid and setpgid now available with all address types option ctty (controlling terminal) now available for all TERMIOS addresses option truncate (a hybrid of open(.., O_TRUNC) and ftruncate()) is replaced by options o-trunc and ftruncate=offset option sourceport now available with TCP and UDP listen addresses to restrict incoming client connections unidirectional mode right-to-left (-U) solved problems and bugs: PROBLEM: addresses without required parameters but an option containing a '/' were incorrectly interpreted as implicit GOPEN address SOLVED: if an address does not have ':' separator but contains '/', check if the slash is before the first ',' before assuming implicit GOPEN. porting: ptys under SunOS work now due to use of stream options further corrections: with -d -d -d -d -D, don't print debug info during file analysis ####################### V 1.1.0.1: new features: .spec file for RPM generation solved problems and bugs: PROBLEM: GOPEN on socket did not apply option unlink-late SOLUTION: GOPEN for socket now applies group NAMED, phase PASTOPEN options PROBLEM: with unidirectional mode, an unnecessary close timeout was applied SOLUTION: in unidirectional mode, terminate without wait time PROBLEM: using GOPEN on a unix domain socket failed for datagram sockets SOLUTION: when connect() fails with EPROTOTYPE, use a datagram socket further corrections: open() flag options had names starting with "o_", now corrected to "o-" in docu, *-listen addresses were called *_listen address unix now called unix-connect because it does not handle unix datagram sockets in test.sh, apply global command line options with all tests ####################### V 1.1.0.0: new features: regular man page and html doc - thanks to kromJx for prototype new address type "readline", utilizing GNU readline and history libs address option "history-file" for readline new option "dash" to "exec" address that allows to start login shells syslog facility can be set per command line option new address option "tcp-quickack", found in Linux 2.4 option -g prevents option group checking filan and procan can print usage procan prints rlimit infos solved problems and bugs: PROBLEM: raw IP socket SIGSEGV'ed when it had been shut down. SOLVED: set eof flag of channel on shutdown. PROBLEM: if channel 2 uses a single non-socket FD in bidirectional mode and has data available while channel 1 reaches EOF, the data is lost. SOLVED: during one loop run, first handle all data transfers and _afterwards_ handle EOF. PROBLEM: despite to option NONBLOCK, the connect() call blocked SOLVED: option NONBLOCK is now applied in phase FD instead of LATE PROBLEM: UNLINK options issued error when file did not exist, terminating socat SOLVED: failure of unlink() is only warning if errno==ENOENT PROBLEM: TCP6-LISTEN required numeric port specification SOLVED: now uses common TCP service resolver PROBLEM: with PIPE, wrong FDs were shown for data transfer loop SOLVED: retrieval of FDs now pays respect to PIPE pecularities PROBLEM: using address EXEC against an address with IGNOREEOF, socat never terminated SOLVED: corrected EOF handling of sigchld porting: MacOS and old AIX versions now have pty flock() now available on Linux (configure check was wrong) named pipe were generated using mknod(), which requires root under BSD now they are generated using mkfifo further corrections: lots of address options that were "forgotten" at runtime are now available option BINDTODEVICE now also called SO-BINDTODEVICE, IF "make install" now installs binaries with ownership 0:0 ####################### V 1.0.4.2: solved problems and bugs: PROBLEM: EOF of one stream caused close of other stream, giving it no chance to go down regularly SOLVED: EOF of one stream now causes shutdown of write part of other stream PROBLEM: sending mail via socks address to qmail showed that crlf option does not work SOLVED: socks address applies PH_LATE options PROBLEM: in debug mode, no info about socat and platform was issued SOLVED: print socat version and uname output in debug mode PROBLEM: invoking socat with -t and no following parameters caused SIGSEGV SOLVED: -t and -b now check next argv entry PROBLEM: when opening of logfile (-lf) failed, no error was reported and no further messages were printed SOLVED: check result of fopen and print error message if it failed new features: address type UDP-LISTEN now supports option fork: it internally applies socket option SO_REUSEADDR so a new UDP socket can bind to port after `accepting´ a connection (child processes might live forever though) (suggestion from Damjan Lango) ####################### V 1.0.4.1: solved problems and bugs: PROB: assert in libc caused an endless recursion SOLVED: no longer catch SIGABRT PROB: socat printed wrong verbose prefix for "right to left" packets SOLVED: new parameter for xiotransfer() passes correct prefix new features: in debug mode, socat prints its command line arguments in verbose mode, escape special characters and replace unprintables with '.'. Patch from Adrian Thurston. ####################### V 1.0.4.0: solved problems and bugs: Debug output for lstat and fstat said "stat" further corrections: FreeBSD now includes libutil.h new features: option setsid with exec/pty option setpgid with exec/pty option ctty with exec/pty TCP V6 connect test gettimeofday in sycls.c (no use yet) porting: before Gethostbyname, invoke inet_aton for MacOSX ####################### V 1.0.3.0: solved problems and bugs: PROB: test 9 of test.sh (echo via file) failed on some platforms, socat exited without error message SOLVED: _xioopen_named_early(): preset statbuf.st_mode with 0 PROB: test 17 hung forever REASON: child death before select loop did not result in EOF SOLVED: check of existence of children before starting select loop PROB: test 17 failed REASON: child dead triggered EOF before last data was read SOLVED: after child death, read last data before setting EOF PROB: filan showed that exec processes incorrectly had fd3 open REASON: inherited open fd3 from main process SOLVED: set CLOEXEC flag on pty fd in main process PROB: help printed "undef" instead of group "FORK" SOLVED: added "FORK" to group name array PROB: fatal messages did not include severity classifier SOLVED: added "F" to severity classifier array PROB: IP6 addresses where printed incorrectly SOLVED: removed type casts to unsigned short * further corrections: socat catches illegal -l modes corrected error message on setsockopt(linger) option tabdly is of type uint correction for UDP over IP6 more cpp conditionals, esp. for IP6 situations better handling of group NAMED options with listening UNIX sockets applyopts2 now includes last given phase corrected option group handling for most address types introduce dropping of unappliable options (dropopts, dropopts2) gopen now accepts socket and unix-socket options exec and system now accept all socket and termios options child process for exec and system addresses with option pty improved descriptions and options for EXAMPLES printf format for file mode changed to "0%03o" with length spec. added va_end() in branch of msg() changed phase of lock options from PASTOPEN to FD support up to four early dying processes structural changes: xiosysincludes now includes sysincludes.h for non xio files new features: option umask CHANGES file TYPE_DOUBLE, u_double OFUNC_OFFSET added getsid(), setsid(), send() to sycls procan prints sid (session id) mail.sh gets -f (from) option new EXAMPLEs for file creation gatherinfo.sh now tells about failures test.sh can check for much more address/option combinations porting: ispeed, ospeed for termios on FreeBSD getpgid() conditional for MacOS 10 added ranlib in Makefile.in for MacOS 10 disable pty option if no pty mechanism is available (MacOS 10) now compiles and runs on MacOS 10 (still some tests fail) setgroups() conditional for cygwin sighandler_t defined conditionally use gcc option -D_GNU_SOURCE