smfi_setmlreply

SYNOPSIS

#include <libmilter/mfapi.h>
int smfi_setmlreply(
	SMFICTX *ctx,
	char *rcode,
	char *xcode,
	...
);

Set the default SMTP error reply code to a multi-line response. Only 4XX and 5XX replies are accepted.

DESCRIPTION

Called When	smfi_setmlreply may be called from any of the xxfi_ callbacks other than xxfi_connect.
Effects	Directly set the SMTP error reply code for this connection to the given lines after the xcode. The list of arguments must be NULL terminated. This code will be used on subsequent error replies resulting from actions taken by this filter.

ARGUMENTS

Argument	Description
ctx	Opaque context structure.
rcode	The three-digit (RFC 821/2821) SMTP reply code, as a null-terminated string. rcode cannot be NULL, and must be a valid 4XX or 5XX reply code.
xcode	The extended (RFC 1893/2034) reply code. If xcode is NULL, no extended code is used. Otherwise, xcode must conform to RFC 1893/2034.
...	The remainder of the arguments are single lines of text, up to 32 arguments, which will be used as the text part of the SMTP reply. The list must be NULL terminated.

RETURN VALUES

For example, the code:

	ret = smfi_setmlreply(ctx, "550", "5.7.0",
			      "Spammer access rejected",
			      "Please see our policy at:",
			      "http://www.example.com/spampolicy.html",
			      NULL);

would give the SMTP response:

550-5.7.0 Spammer access rejected
550-5.7.0 Please see our policy at:
550 5.7.0 http://www.example.com/spampolicy.html

RETURN VALUES

smfi_setmlreply will fail and return MI_FAILURE if:

The rcode or xcode argument is invalid.
A memory-allocation failure occurs.
If any text line contains a carraige return or line feed.
The length of any text line is more than MAXREPLYLEN (980).
More than 32 lines of text replies are given.

Otherwise, it return MI_SUCCESS.

NOTES

Values passed to smfi_setmlreply are not checked for standards compliance.
The message parameter should contain only printable characters, other characters may lead to undefined behavior. For example, CR or LF will cause the call to fail, single '%' characters will cause the text to be ignored (if there really should be a '%' in the string, use '%%' just like for printf(3)).
For details about reply codes and their meanings, please see RFC's 821/ 2821 and 1893/ 2034.
If the reply code (rcode) given is a '4XX' code but SMFI_REJECT is used for the message, the custom reply is not used.
Similarly, if the reply code (rcode) given is a '5XX' code but SMFI_TEMPFAIL is used for the message, the custom reply is not used.
Note: in neither of the last two cases an error is returned to the milter, libmilter silently ignores the reply code.
If the milter returns SMFI_TEMPFAIL and sets the reply code to '421', then the SMTP server will terminate the SMTP session with a 421 error code.