# smfi_register

SYNOPSIS |
    #include <libmilter/mfapi.h>
    int smfi_register(
    	smfiDesc_str descr
    );
Register a set of filter callbacks.
DESCRIPTION |
Called When | smfi_register must be called before smfi_main
Effects | smfi_register creates a filter using the information given in the smfiDesc_str argument. Multiple calls to smfi_register within a single process are not allowed.
ARGUMENTS |
Argument | Description
--- | ---
descr | A filter descriptor of type smfiDesc_str describing the filter's functions. The structure has the following members:
    struct smfiDesc
    {
    	char		*xxfi_name;	/* filter name */
    	int		xxfi_version;	/* version code -- do not change */
    	unsigned long	xxfi_flags;	/* flags */

    	/* connection info filter */
    	sfsistat	(*xxfi_connect)(SMFICTX *, char *, _SOCK_ADDR *);
    	/* SMTP HELO command filter */
    	sfsistat	(*xxfi_helo)(SMFICTX *, char *);
    	/* envelope sender filter */
    	sfsistat	(*xxfi_envfrom)(SMFICTX *, char **);
    	/* envelope recipient filter */
    	sfsistat	(*xxfi_envrcpt)(SMFICTX *, char **);
    	/* header filter */
    	sfsistat	(*xxfi_header)(SMFICTX *, char *, char *);
    	/* end of header */
    	sfsistat	(*xxfi_eoh)(SMFICTX *);
    	/* body block */
    	sfsistat	(*xxfi_body)(SMFICTX *, unsigned char *, size_t);
    	/* end of message */
    	sfsistat	(*xxfi_eom)(SMFICTX *);
    	/* message aborted */
    	sfsistat	(*xxfi_abort)(SMFICTX *);
    	/* connection cleanup */
    	sfsistat	(*xxfi_close)(SMFICTX *);
    };
A NULL value for any callback function indicates that the filter does not wish to process the given type of information, simply returning SMFIS_CONTINUE.
RETURN VALUES | smfi_register may return MI_FAILURE for any of the following reasons: memory allocation failed. incompatible version or illegal flags value.
NOTES | The xxfi_flags field should contain the bitwise OR of zero or more of the following values, describing the actions the filter may take:
Flag | Description
--- | ---
SMFIF_ADDHDRS | This filter may add headers.
SMFIF_CHGHDRS | This filter may change and/or delete headers.
SMFIF_CHGBODY | This filter may replace the body during filtering. This may have significant performance impact if other filters do body filtering after this filter.
SMFIF_ADDRCPT | This filter may add recipients to the message.
SMFIF_DELRCPT | This filter may remove recipients from the message.

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