verify.c

[詳解]

/*++
/* NAME
/*  verify 3
/* SUMMARY
/*  update verify database
/* SYNOPSIS
/*  #include <verify.h>
/*
/*  int verify_append(queue_id, stats, recipient, relay, dsn,
/*              verify_status)
/*  const char *queue_id;
/*  MSG_STATS *stats;
/*  RECIPIENT *recipient;
/*  const char *relay;
/*  DSN *dsn;
/*  int verify_status;
/* DESCRIPTION
/*  This module implements an impedance adaptor between the
/*  verify_clnt interface and the interface expected by the
/*  bounce/defer/sent modules.
/*
/*  verify_append() updates the address verification database
/*  and logs the action to the mailer logfile.
/*
/*  Arguments:
/* .IP queue_id
/*  The message queue id.
/* .IP stats
/*  Time stamps from different message delivery stages
/*  and session reuse count.
/* .IP recipient
/*  Recipient information. See recipient_list(3).
/* .IP relay
/*  Name of the host we're talking to.
/* .IP dsn
/*  Delivery status information. See dsn(3).
/*  The action is one of "deliverable" or "undeliverable".
/* .IP verify_status
/*  One of the following recipient verification status codes:
/* .RS
/* .IP DEL_REQ_RCPT_STAT_OK
/*  Successful delivery.
/* .IP DEL_REQ_RCPT_STAT_DEFER
/*  Temporary delivery error.
/* .IP DEL_REQ_RCPT_STAT_BOUNCE
/*  Hard delivery error.
/* .RE
/* DIAGNOSTICS
/*  A non-zero result means the operation failed.
/*
/*  Fatal: out of memory.
/* BUGS
/*  Should be replaced by routines with an attribute-value based
/*  interface instead of an interface that uses a rigid argument list.
/* 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
/*
/*  Wietse Venema
/*  Google, Inc.
/*  111 8th Avenue
/*  New York, NY 10011, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <string.h>

/* Utility library. */

#include <msg.h>
#include <vstring.h>
#include <stringops.h>

/* Global library. */

#include <mail_params.h>
#include <mail_proto.h>
#include <verify_clnt.h>
#include <log_adhoc.h>
#include <verify.h>

/* verify_append - update address verification database */

int     verify_append(const char *queue_id, MSG_STATS *stats,
                      RECIPIENT *recipient, const char *relay,
                      DSN *dsn, int vrfy_stat)
{
    int     req_stat;
    DSN     my_dsn = *dsn;

    /*
     * Impedance adaptor between bounce/defer/sent and verify_clnt.
     * 
     * XXX No DSN check; this routine is called from bounce/defer/sent, which
     * know what the DSN initial digit should look like.
     * 
     * XXX vrfy_stat is competely redundant because of dsn.
     */
    if (var_verify_neg_cache || vrfy_stat == DEL_RCPT_STAT_OK) {
    if (recipient->orig_addr[0])
        req_stat = verify_clnt_update(recipient->orig_addr, vrfy_stat,
                      my_dsn.reason);
    /* Two verify updates for one verify request! */
    if (req_stat == VRFY_STAT_OK
        && strcmp(recipient->address, recipient->orig_addr) != 0)
        req_stat = verify_clnt_update(recipient->address, vrfy_stat,
                      my_dsn.reason);
    } else {
    my_dsn.action = "undeliverable-but-not-cached";
    req_stat = VRFY_STAT_OK;
    }
    if (req_stat == VRFY_STAT_OK) {
    log_adhoc(queue_id, stats, recipient, relay, dsn, my_dsn.action);
    req_stat = 0;
    } else {
    msg_warn("%s: %s service failure", queue_id, var_verify_service);
    req_stat = -1;
    }
    return (req_stat);
}