pr3287 [options] [L:][Y:][LUname[,LUname...]@]hostname[:port][=accept]
pr3287 opens a telnet connection to an IBM host, and emulates an IBM 3287 printer. It implements RFCs 2355 (TN3270E), 1576 (TN3270) and 1646 (LU name selection).
If the hostname is prefixed with L:, the connection will be made through an SSL/TLS tunnel. If the hostname is also prefixed with Y:, the host's SSL/TLS certificate will not be checked. pr3287 also supports TELNET START-TLS option negotiation without any need for command-line options.
A specific LU name to use may be specified by prepending it to the hostname with an `@'. Multiple LU names to try can be separated by commas. An empty LU can be placed in the list with an extra comma.
The port to connect to defaults to telnet. This can be overridden by appending a port to the hostname with a colon `:'.
An accept name (a name to compare to the host's SSL/TLS certificate) may be specified by appending it with an equals sign.
pr3287 understands the following options:
- -accepthostname name
Specifies a particular hostname to accept when validating the name presented in the server SSL certificate, instead of comparing to the name used to make the connection. name can either be any (OpenSSL only), which disables name validation, or a specific name.
- -assoc LUname
Causes the session to be associated with the specified LUname.
In LU3 formatted mode, print blank lines even if they are all NULLs or control characters. (This is a violation of the 3270 printer protocol, but some hosts require it.)
- -cadir directory
Specifies a directory containing CA (root) certificates to use when verifying a certificate provided by the host. (OpenSSL only)
- -cafile filename
Specifies a PEM-format file containing CA (root) certificates to use when verifying a certificate provided by the host. (OpenSSL only)
- -certfile filename
Specifies a file containing a certificate to provide to the host. The default file type is PEM (OpenSSL) or PKCS12 (MacOS).
- -certfiletype type
Specifies the type of the certificate file specified by -certfile. Type can be pem or asn1. (OpenSSL only)
- -chainfile filename
Specifies a certificate chain file in PEM format, containing a certificate to provide to the host, as well as one or more intermediate certificates and the CA certificate used to sign that certificate. If -chainfile is specified, it overrides -certfile. (OpenSSL only)
- -clientcert name
Specifies the name of a client certificate to provide to the host. It must be installed in the keychain. (MacOS only)
- -charset name
Specifies an alternate host code page (input EBCDIC mapping). The default maps the U.S. English (037) code page to the current locale character encoding. pr3287 generally supports the same host character sets as x3270.
- -command command
Specifies the command to run for each print job. The default is lpr.
Causes newline characters in the output to be expanded to carriage-return/linefeed sequences.
In unformatted 3270 mode, causes EBCDIC CR orders to be passed to directly to the printer as ASCII CR characters, and the output buffer to be flushed, instead of being specially interpreted by pr3287.
By default, EBCDIC CRs cause the (virtual) print head to return to column 0, so that subsequent text overwrites what is already in the buffer, and the buffer is flushed only when an EBCDIC NL or EM order is received.
Causes pr3287 to become a daemon (background) process.
- -eojtimeout seconds
Causes pr3287 to complete the print job after seconds seconds of inactivity.
Causes pr3287 to flush any pending printer output whenever an EM (End of Medium) order arrives in unformatted 3270 mode. This can help preserve multi-page output with hosts that do not clear the 3270 buffer between pages. (Note: This option is defined for historical purposes only; -emflush is now the default.)
Causes pr3287 not to flush any pending printer output when an EM (End of Medium) order arrives in unformatted 3270 mode.
Ignore TN3270E PRINT-EOJ commands, relying on UNBIND commands to indicate the ends of print jobs.
Causes pr3287 to add a FF (formfeed) at the end of each print job.
Causes pr3287 to ignore a FF (formfeed) order if it occurs at the top of a page.
In SCS mode, causes pr3287 to pass FF (formfeed) orders through to the printer as ASCII formfeed characters, rather than simulating them based on the values of the MPL (maximum presentation line) and TM (top margin) parameters.
- -keyfile filename
Specifies a file containing the private key for the certificate file (specified via -certfile or -chainfile). The default file type is PEM. (OpenSSL only)
- -keyfiletype type
Specifies the type of the private key file specified by -keyfile. Type can be pem or asn1. (OpenSSL only)
- -keypasswd type:value
Specifies the password for the private key file, if it is encrypted. The argument can be file:filename, specifying that the password is in a file, or string:string, specifying the password on the command-line directly.
- -mpp n
Specifies a non-default value for the Maximum Presentation Position (the line length for unformatted Write commands). The default is 132. The minimum is 40 and the maximum is 256.
Do not verify the host certificate for SSL/TLS connections.
- -proxy type:host[:port]
Causes pr3287 to connect via the specified proxy, instead of using a direct connection. The host can be an IP address or hostname. The optional port can be a number or a service name. For a list of supported proxy types, see Proxy below.
Causes pr3287 to reconnect to the host, whenever the connection is broken. There is a 5-second delay between reconnect attempts, to reduce network thrashing for down or misconfigured hosts.
For unformatted writes, skip ASA carriage control characters (e.g., blank for single-space, 0 for double-space, 1 for formfeed, etc.) in the first position of each line of host output.
Turns on data stream tracing. Trace information is usually saved in the file /tmp/x3trc.pid.
- -tracedir dir
Specifies the directory to save trace files in, instead of /tmp.
- -trnpre file
Specifies a file containing data that will be sent to the printer before each print job. The file contents are treated as transparent data, i.e., they are not translated in any way.
- -trnpost file
Specifies a file containing data that will be sent to the printer after each print job. The file contents are treated as transparent data, i.e., they are not translated in any way.
Display build and version information and exit.
Verify the host certificate for SSL/TLS connections. (This is the default setting.)
- -xtable file
Specifies a file containing transparent data translations. The file specifies EBCDIC characters that will be translated into transparent ASCII data (data that will not be further translated and will not count as taking up column(s) on the print line). Any printable ECBDIC code can be translated to zero or more ASCII characters.
The table consists of lines that look like:
ebcdic ebcdic-code ascii ascii-code...
The ebcdic-code can be specified in hexadecimal X'nn' notation or as numbers in decimal, octal (with a leading 0) or hexadecimal (with a leading 0x). The ascii-codes can be specified as numbers in decimal, octal or hexadecimal, control codes such as ^X, symbolic control codes such as CR or Escape, or as double-quoted strings, following the full C-language conventions, such as \r for a carriage return. Comments begin with #, ! or //.
Here are some examples of translations.
# Expand EBCDIC D to an escape sequence.
ebcdic X'C4' ascii Esc "]1,3" 0x6d
# Delete EBCDIC B's
ebcdic X'C2' ascii
The full list of symbolic control codes is: BS CR BEL ESC ESCAPE FF HT LF NL NUL SPACE TAB VT.
SIGINT, SIGHUP and SIGTERM cause the current print job to be flushed (any pending data to be printed) and pr3287 to exit.
SIGUSR1 causes the current print job to be flushed without otherwise affecting the pr3287 process.
The -proxy option causes pr3287 to use a proxy server to connect to the host. The syntax of the option is:
The supported values for type are:
|Proxy Type||Protocol||Default Port|
|http||RFC 2817 HTTP tunnel (squid)||3128|
|socks4||SOCKS version 4||1080|
|socks5||SOCKS version 5 (RFC 1928)||1080|
|telnet||No protocol (just send connect host port)||none|
The special types socks4a and socks5d can also be used to force the proxy server to do the hostname resolution for the SOCKS protocol.
x3270(1), c3270(1), telnet(1), tn3270(1)
Data Stream Programmer's Reference, IBM GA23-0059
Character Set Reference, IBM GA27-3831
3174 Establishment Controller Functional Description, IBM GA23-0218
RFC 1576, TN3270 Current Practices
RFC 1646, TN3270 Extensions for LUname and Printer Selection
RFC 2355, TN3270 Enhancements
Copyright 1993-2021, Paul Mattes.
Copyright 1990, Jeff Sparkes.
Copyright 1989, Georgia Tech Research Corporation (GTRC), Atlanta, GA
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