sendmail, 4th Edition

Arguments Passed to checkcompat( )

The checkcompat( ) is found in the C-language source file sendmail/conf.c. Inside that file you will find it declared like this:

checkcompat(to, e)
        register ADDRESS *to;
        register ENVELOPE *e;

Here, to is a pointer to a structure of typedef ADDRESS which contains information about the recipient. And e is a pointer to a structure of typedef ENVELOPE which contains information about the current envelope. (Actually, both are linked lists of structures.)

The members of the ADDRESS *to structure are shown in Table C-1. Note that these members are correct for V8.14 sendmail only. Also note that the table shows only those members that can be useful in a checkcompat( ) routine (see sendmail.h for the other members of *to).

Table C-1. ADDRESS *to members

Type	Member	Description
struct address *	q_alias	The alias that yielded this address
char *	q_finalrcpt	This is a Final-Recipient: DSN header
unsigned long	q_flags	Address flags
char *	q_fullname	The (GECOS) full name of q_ruser, if known
gid_t	q_gid	The gid of the q_ruser, if known
char *	q_home	The home directory (path), if F=w delivery-agent flag is set
char *	q_host	The host part ($@) from rule set 0
struct mailer *	q_mailer	The delivery agent ($#) from rule set 0
char *	q_message	Message regarding address (not always an error)
struct address *	q_next	Link to the next ADDRESS in the chain
char *	q_orcpt	The ORCPT parameter from RCPT TO: line was set
char *	q_owner