indirect.c

[詳解]

/*++
/* NAME
/*  indirect 3
/* SUMMARY
/*  indirect delivery
/* SYNOPSIS
/*  #include "local.h"
/*
/*  void    deliver_indirect(state)
/*  LOCAL_STATE state;
/*  char    *recipient;
/* DESCRIPTION
/*  deliver_indirect() delivers a message via the message
/*  forwarding service, with duplicate filtering up to a
/*  configurable number of recipients.
/*
/*  Arguments:
/* .IP state
/*  The attributes that specify the message, sender and more.
/*  A table with the results from expanding aliases or lists.
/* CONFIGURATION VARIABLES
/*  duplicate_filter_limit, duplicate filter size limit
/* DIAGNOSTICS
/*  The result is non-zero when the operation should be tried again.
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <unistd.h>

/* Utility library. */

#include <msg.h>
#include <htable.h>

/* Global library. */

#include <mail_params.h>
#include <bounce.h>
#include <defer.h>
#include <been_here.h>
#include <sent.h>

/* Application-specific. */

#include "local.h"

/* deliver_indirect - deliver mail via forwarding service */

int     deliver_indirect(LOCAL_STATE state)
{

    /*
     * Suppress duplicate expansion results. Add some sugar to the name to
     * avoid collisions with other duplicate filters. Allow the user to
     * specify an upper bound on the size of the duplicate filter, so that we
     * can handle huge mailing lists with millions of recipients.
     */
    if (msg_verbose)
    msg_info("deliver_indirect: %s", state.msg_attr.rcpt.address);
    if (been_here(state.dup_filter, "indirect %s",
          state.msg_attr.rcpt.address))
    return (0);

    /*
     * Don't forward a trace-only request.
     */
    if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
    dsb_simple(state.msg_attr.why, "2.0.0", "forwards to %s",
           state.msg_attr.rcpt.address);
    return (sent(BOUNCE_FLAGS(state.request), SENT_ATTR(state.msg_attr)));
    }

    /*
     * Send the address to the forwarding service. Inherit the delivered
     * attribute from the alias or from the .forward file owner.
     */
    if (forward_append(state.msg_attr)) {
    dsb_simple(state.msg_attr.why, "4.3.0", "unable to forward message");
    return (defer_append(BOUNCE_FLAGS(state.request),
                 BOUNCE_ATTR(state.msg_attr)));
    }
    return (0);
}