sendmail/src/recipient.c

	recipient.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright (c) 1998-2003 Sendmail, Inc. and its suppliers.
 *  All rights reserved.
 * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
 * Copyright (c) 1988, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sendmail.h>

SM_RCSID("@(#)$Id: recipient.c,v 8.337 2004/08/03 19:57:23 ca Exp $")

static void includetimeout __P((int));
static ADDRESS  *self_reference __P((ADDRESS *));
static int  sortexpensive __P((ADDRESS *, ADDRESS *));
static int  sortbysignature __P((ADDRESS *, ADDRESS *));
static int  sorthost __P((ADDRESS *, ADDRESS *));

typedef int sortfn_t __P((ADDRESS *, ADDRESS *));

/*
**  SORTHOST -- strcmp()-like func for host portion of an ADDRESS
**
**  Parameters:
**      xx -- first ADDRESS
**      yy -- second ADDRESS
**
**  Returns:
**      <0 when xx->q_host is less than yy->q_host
**      >0 when xx->q_host is greater than yy->q_host
**      0 when equal
*/

static int
sorthost(xx, yy)
    register ADDRESS *xx;
    register ADDRESS *yy;
{
#if _FFR_HOST_SORT_REVERSE
    /* XXX maybe compare hostnames from the end? */
    return sm_strrevcasecmp(xx->q_host, yy->q_host);
#else /* _FFR_HOST_SORT_REVERSE */
    return sm_strcasecmp(xx->q_host, yy->q_host);
#endif /* _FFR_HOST_SORT_REVERSE */
}

/*
**  SORTEXPENSIVE -- strcmp()-like func for expensive mailers
**
**  The mailer has been noted already as "expensive" for 'xx'. This
**  will give a result relative to 'yy'. Expensive mailers get rated
**  "greater than" non-expensive mailers because during the delivery phase
**  it will get queued -- no use it getting in the way of less expensive
**  recipients. We avoid an MX RR lookup when both 'xx' and 'yy' are
**  expensive since an MX RR lookup happens when extracted from the queue
**  later.
**
**  Parameters:
**      xx -- first ADDRESS
**      yy -- second ADDRESS
**
**  Returns:
**      <0 when xx->q_host is less than yy->q_host and both are
**          expensive
**      >0 when xx->q_host is greater than yy->q_host, or when
**          'yy' is non-expensive
**      0 when equal (by expense and q_host)
*/

static int
sortexpensive(xx, yy)
    ADDRESS *xx;
    ADDRESS *yy;
{
    if (!bitnset(M_EXPENSIVE, yy->q_mailer->m_flags))
        return 1; /* xx should go later */
#if _FFR_HOST_SORT_REVERSE
    /* XXX maybe compare hostnames from the end? */
    return sm_strrevcasecmp(xx->q_host, yy->q_host);
#else /* _FFR_HOST_SORT_REVERSE */
    return sm_strcasecmp(xx->q_host, yy->q_host);
#endif /* _FFR_HOST_SORT_REVERSE */
}

/*
**  SORTBYSIGNATURE -- a strcmp()-like func for q_mailer and q_host in ADDRESS
**
**  Parameters:
**      xx -- first ADDRESS
**      yy -- second ADDRESS
**
**  Returns:
**      0 when the "signature"'s are same
**      <0 when xx->q_signature is less than yy->q_signature
**      >0 when xx->q_signature is greater than yy->q_signature
**
**  Side Effect:
**      May set ADDRESS pointer for q_signature if not already set.
*/

static int
sortbysignature(xx, yy)
    ADDRESS *xx;
    ADDRESS *yy;
{
    register int ret;

    /* Let's avoid redoing the signature over and over again */
    if (xx->q_signature == NULL)
        xx->q_signature = hostsignature(xx->q_mailer, xx->q_host);
    if (yy->q_signature == NULL)
        yy->q_signature = hostsignature(yy->q_mailer, yy->q_host);
    ret = strcmp(xx->q_signature, yy->q_signature);

    /*
    **  If the two signatures are the same then we will return a sort
    **  value based on 'q_user'. But note that we have reversed xx and yy
    **  on purpose. This additional compare helps reduce the number of
    **  sameaddr() calls and loops in recipient() for the case when
    **  the rcpt list has been provided already in-order.
    */

    if (ret == 0)
        return strcmp(yy->q_user, xx->q_user);
    else
        return ret;
}

/*
**  SENDTOLIST -- Designate a send list.
**
**  The parameter is a comma-separated list of people to send to.
**  This routine arranges to send to all of them.
**
**  Parameters:
**      list -- the send list.
**      ctladdr -- the address template for the person to
**          send to -- effective uid/gid are important.
**          This is typically the alias that caused this
**          expansion.
**      sendq -- a pointer to the head of a queue to put
**          these people into.
**      aliaslevel -- the current alias nesting depth -- to
**          diagnose loops.
**      e -- the envelope in which to add these recipients.
**
**  Returns:
**      The number of addresses actually on the list.
*/

/* q_flags bits inherited from ctladdr */
#define QINHERITEDBITS  (QPINGONSUCCESS|QPINGONFAILURE|QPINGONDELAY|QHASNOTIFY)

int
sendtolist(list, ctladdr, sendq, aliaslevel, e)
    char *list;
    ADDRESS *ctladdr;
    ADDRESS **sendq;
    int aliaslevel;
    register ENVELOPE *e;
{
    register char *p;
    register ADDRESS *SM_NONVOLATILE al; /* list of addresses to send to */
    SM_NONVOLATILE char delimiter;      /* the address delimiter */
    SM_NONVOLATILE int naddrs;
    SM_NONVOLATILE int i;
    char *endp;
    char *oldto = e->e_to;
    char *SM_NONVOLATILE bufp;
    char buf[MAXNAME + 1];

    if (list == NULL)
    {
        syserr("sendtolist: null list");
        return 0;
    }

    if (tTd(25, 1))
    {
        sm_dprintf("sendto: %s\n   ctladdr=", list);
        printaddr(sm_debug_file(), ctladdr, false);
    }

    /* heuristic to determine old versus new style addresses */
    if (ctladdr == NULL &&
        (strchr(list, ',') != NULL || strchr(list, ';') != NULL ||
         strchr(list, '<') != NULL || strchr(list, '(') != NULL))
        e->e_flags &= ~EF_OLDSTYLE;
    delimiter = ' ';
    if (!bitset(EF_OLDSTYLE, e->e_flags) || ctladdr != NULL)
        delimiter = ',';

    al = NULL;
    naddrs = 0;

    /* make sure we have enough space to copy the string */
    i = strlen(list) + 1;
    if (i <= sizeof buf)
    {
        bufp = buf;
        i = sizeof buf;
    }
    else
        bufp = sm_malloc_x(i);
    endp = bufp + i;

    SM_TRY
    {
        (void) sm_strlcpy(bufp, denlstring(list, false, true), i);

        macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), "e r");
        for (p = bufp; *p != '\0'; )
        {
            auto char *delimptr;
            register ADDRESS *a;

            SM_ASSERT(p < endp);

            /* parse the address */
            while ((isascii(*p) && isspace(*p)) || *p == ',')
                p++;
            SM_ASSERT(p < endp);
            a = parseaddr(p, NULLADDR, RF_COPYALL, delimiter,
                      &delimptr, e, true);
            p = delimptr;
            SM_ASSERT(p < endp);
            if (a == NULL)
                continue;
            a->q_next = al;
            a->q_alias = ctladdr;

            /* arrange to inherit attributes from parent */
            if (ctladdr != NULL)
            {
                ADDRESS *b;

                /* self reference test */
                if (sameaddr(ctladdr, a))
                {
                    if (tTd(27, 5))
                    {
                        sm_dprintf("sendtolist: QSELFREF ");
                        printaddr(sm_debug_file(), ctladdr, false);
                    }
                    ctladdr->q_flags |= QSELFREF;
                }

                /* check for address loops */
                b = self_reference(a);
                if (b != NULL)
                {
                    b->q_flags |= QSELFREF;
                    if (tTd(27, 5))
                    {
                        sm_dprintf("sendtolist: QSELFREF ");
                        printaddr(sm_debug_file(), b, false);
                    }
                    if (a != b)
                    {
                        if (tTd(27, 5))
                        {
                            sm_dprintf("sendtolist: QS_DONTSEND ");
                            printaddr(sm_debug_file(), a, false);
                        }
                        a->q_state = QS_DONTSEND;
                        b->q_flags |= a->q_flags & QNOTREMOTE;
                        continue;
                    }
                }

                /* full name */
                if (a->q_fullname == NULL)
                    a->q_fullname = ctladdr->q_fullname;

                /* various flag bits */
                a->q_flags &= ~QINHERITEDBITS;
                a->q_flags |= ctladdr->q_flags & QINHERITEDBITS;

                /* DSN recipient information */
                a->q_finalrcpt = ctladdr->q_finalrcpt;
                a->q_orcpt = ctladdr->q_orcpt;
            }

            al = a;
        }

        /* arrange to send to everyone on the local send list */
        while (al != NULL)
        {
            register ADDRESS *a = al;

            al = a->q_next;
            a = recipient(a, sendq, aliaslevel, e);
            naddrs++;
        }
    }
    SM_FINALLY
    {
        e->e_to = oldto;
        if (bufp != buf)
            sm_free(bufp);
        macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), NULL);
    }
    SM_END_TRY
    return naddrs;
}
#if MILTER
/*
**  REMOVEFROMLIST -- Remove addresses from a send list.
**
**  The parameter is a comma-separated list of recipients to remove.
**  Note that it only deletes matching addresses.  If those addresses
**  have been expanded already in the sendq, it won't mark the
**  expanded recipients as QS_REMOVED.
**
**  Parameters:
**      list -- the list to remove.
**      sendq -- a pointer to the head of a queue to remove
**          these addresses from.
**      e -- the envelope in which to remove these recipients.
**
**  Returns:
**      The number of addresses removed from the list.
**
*/

int
removefromlist(list, sendq, e)
    char *list;
    ADDRESS **sendq;
    ENVELOPE *e;
{
    SM_NONVOLATILE char delimiter;      /* the address delimiter */
    SM_NONVOLATILE int naddrs;
    SM_NONVOLATILE int i;
    char *p;
    char *oldto = e->e_to;
    char *SM_NONVOLATILE bufp;
    char buf[MAXNAME + 1];

    if (list == NULL)
    {
        syserr("removefromlist: null list");
        return 0;
    }

    if (tTd(25, 1))
        sm_dprintf("removefromlist: %s\n", list);

    /* heuristic to determine old versus new style addresses */
    if (strchr(list, ',') != NULL || strchr(list, ';') != NULL ||
        strchr(list, '<') != NULL || strchr(list, '(') != NULL)
        e->e_flags &= ~EF_OLDSTYLE;
    delimiter = ' ';
    if (!bitset(EF_OLDSTYLE, e->e_flags))
        delimiter = ',';

    naddrs = 0;

    /* make sure we have enough space to copy the string */
    i = strlen(list) + 1;
    if (i <= sizeof buf)
    {
        bufp = buf;
        i = sizeof buf;
    }
    else
        bufp = sm_malloc_x(i);

    SM_TRY
    {
        (void) sm_strlcpy(bufp, denlstring(list, false, true), i);

        macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), "e r");
        for (p = bufp; *p != '\0'; )
        {
            ADDRESS a;  /* parsed address to be removed */
            ADDRESS *q;
            ADDRESS **pq;
            char *delimptr;

            /* parse the address */
            while ((isascii(*p) && isspace(*p)) || *p == ',')
                p++;
            if (parseaddr(p, &a, RF_COPYALL,
                      delimiter, &delimptr, e, true) == NULL)
            {
                p = delimptr;
                continue;
            }
            p = delimptr;
            for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
            {
                if (!QS_IS_DEAD(q->q_state) &&
                    (sameaddr(q, &a) ||
                     strcmp(q->q_paddr, a.q_paddr) == 0))
                {
                    if (tTd(25, 5))
                    {
                        sm_dprintf("removefromlist: QS_REMOVED ");
                        printaddr(sm_debug_file(), &a, false);
                    }
                    q->q_state = QS_REMOVED;
                    naddrs++;
                    break;
                }
            }
        }
    }
    SM_FINALLY
    {
        e->e_to = oldto;
        if (bufp != buf)
            sm_free(bufp);
        macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), NULL);
    }
    SM_END_TRY
    return naddrs;
}
#endif /* MILTER */
/*
**  RECIPIENT -- Designate a message recipient
**
**  Saves the named person for future mailing.
**
**  Parameters:
**      new -- the (preparsed) address header for the recipient.
**      sendq -- a pointer to the head of a queue to put the
**          recipient in.  Duplicate suppression is done
**          in this queue.
**      aliaslevel -- the current alias nesting depth.
**      e -- the current envelope.
**
**  Returns:
**      The actual address in the queue.  This will be "a" if
**      the address is not a duplicate, else the original address.
**
*/

ADDRESS *
recipient(new, sendq, aliaslevel, e)
    register ADDRESS *new;
    register ADDRESS **sendq;
    int aliaslevel;
    register ENVELOPE *e;
{
    register ADDRESS *q;
    ADDRESS **pq;
    ADDRESS **prev;
    register struct mailer *m;
    register char *p;
    int i, buflen;
    bool quoted;        /* set if the addr has a quote bit */
    bool insert;
    int findusercount;
    bool initialdontsend;
    char *buf;
    char buf0[MAXNAME + 1];     /* unquoted image of the user name */
    sortfn_t *sortfn;

    p = NULL;
    quoted = false;
    insert = false;
    findusercount = 0;
    initialdontsend = QS_IS_DEAD(new->q_state);
    e->e_to = new->q_paddr;
    m = new->q_mailer;
    errno = 0;
    if (aliaslevel == 0)
        new->q_flags |= QPRIMARY;
    if (tTd(26, 1))
    {
        sm_dprintf("\nrecipient (%d): ", aliaslevel);
        printaddr(sm_debug_file(), new, false);
    }

    /* if this is primary, use it as original recipient */
    if (new->q_alias == NULL)
    {
        if (e->e_origrcpt == NULL)
            e->e_origrcpt = new->q_paddr;
        else if (e->e_origrcpt != new->q_paddr)
            e->e_origrcpt = "";
    }

    /* find parent recipient for finalrcpt and orcpt */
    for (q = new; q->q_alias != NULL; q = q->q_alias)
        continue;

    /* find final recipient DSN address */
    if (new->q_finalrcpt == NULL &&
        e->e_from.q_mailer != NULL)
    {
        char frbuf[MAXLINE];

        p = e->e_from.q_mailer->m_addrtype;
        if (p == NULL)
            p = "rfc822";
        if (sm_strcasecmp(p, "rfc822") != 0)
        {
            (void) sm_snprintf(frbuf, sizeof frbuf, "%s; %.800s",
                       q->q_mailer->m_addrtype,
                       q->q_user);
        }
        else if (strchr(q->q_user, '@') != NULL)
        {
            (void) sm_snprintf(frbuf, sizeof frbuf, "%s; %.800s",
                       p, q->q_user);
        }
        else if (strchr(q->q_paddr, '@') != NULL)
        {
            char *qp;
            bool b;

            qp = q->q_paddr;

            /* strip brackets from address */
            b = false;
            if (*qp == '<')
            {
                b = qp[strlen(qp) - 1] == '>';
                if (b)
                    qp[strlen(qp) - 1] = '\0';
                qp++;
            }
            (void) sm_snprintf(frbuf, sizeof frbuf, "%s; %.800s",
                       p, qp);

            /* undo damage */
            if (b)
                qp[strlen(qp)] = '>';
        }
        else
        {
            (void) sm_snprintf(frbuf, sizeof frbuf,
                       "%s; %.700s@%.100s",
                       p, q->q_user, MyHostName);
        }
        new->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool, frbuf);
    }

#if _FFR_GEN_ORCPT
    /* set ORCPT DSN arg if not already set */
    if (new->q_orcpt == NULL)
    {
        /* check for an existing ORCPT */
        if (q->q_orcpt != NULL)
            new->q_orcpt = q->q_orcpt;
        else
        {
            /* make our own */
            bool b = false;
            char *qp;
            char obuf[MAXLINE];

            if (e->e_from.q_mailer != NULL)
                p = e->e_from.q_mailer->m_addrtype;
            if (p == NULL)
                p = "rfc822";
            (void) sm_strlcpyn(obuf, sizeof obuf, 2, p, ";");

            qp = q->q_paddr;

            /* FFR: Needs to strip comments from stdin addrs */

            /* strip brackets from address */
            if (*qp == '<')
            {
                b = qp[strlen(qp) - 1] == '>';
                if (b)
                    qp[strlen(qp) - 1] = '\0';
                qp++;
            }

            p = xtextify(denlstring(qp, true, false), NULL);

            if (sm_strlcat(obuf, p, sizeof obuf) >= sizeof obuf)
            {
                /* if too big, don't use it */
                obuf[0] = '\0';
            }

            /* undo damage */
            if (b)
                qp[strlen(qp)] = '>';

            if (obuf[0] != '\0')
                new->q_orcpt =
                    sm_rpool_strdup_x(e->e_rpool, obuf);
        }
    }
#endif /* _FFR_GEN_ORCPT */

    /* break aliasing loops */
    if (aliaslevel > MaxAliasRecursion)
    {
        new->q_state = QS_BADADDR;
        new->q_status = "5.4.6";
        usrerrenh(new->q_status,
              "554 aliasing/forwarding loop broken (%d aliases deep; %d max)",
              aliaslevel, MaxAliasRecursion);
        return new;
    }

    /*
    **  Finish setting up address structure.
    */

    /* get unquoted user for file, program or user.name check */
    i = strlen(new->q_user);
    if (i >= sizeof buf0)
    {
        buflen = i + 1;
        buf = xalloc(buflen);
    }
    else
    {
        buf = buf0;
        buflen = sizeof buf0;
    }
    (void) sm_strlcpy(buf, new->q_user, buflen);
    for (p = buf; *p != '\0' && !quoted; p++)
    {
        if (*p == '\\')
            quoted = true;
    }
    stripquotes(buf);

    /* check for direct mailing to restricted mailers */
    if (m == ProgMailer)
    {
        if (new->q_alias == NULL || UseMSP ||
            bitset(EF_UNSAFE, e->e_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            usrerrenh(new->q_status,
                  "550 Cannot mail directly to programs");
        }
        else if (bitset(QBOGUSSHELL, new->q_alias->q_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            if (new->q_alias->q_ruser == NULL)
                usrerrenh(new->q_status,
                      "550 UID %d is an unknown user: cannot mail to programs",
                      new->q_alias->q_uid);
            else
                usrerrenh(new->q_status,
                      "550 User %s@%s doesn't have a valid shell for mailing to programs",
                      new->q_alias->q_ruser, MyHostName);
        }
        else if (bitset(QUNSAFEADDR, new->q_alias->q_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            new->q_rstatus = "550 Unsafe for mailing to programs";
            usrerrenh(new->q_status,
                  "550 Address %s is unsafe for mailing to programs",
                  new->q_alias->q_paddr);
        }
    }

    /*
    **  Look up this person in the recipient list.
    **  If they are there already, return, otherwise continue.
    **  If the list is empty, just add it.  Notice the cute
    **  hack to make from addresses suppress things correctly:
    **  the QS_DUPLICATE state will be set in the send list.
    **  [Please note: the emphasis is on "hack."]
    */

    prev = NULL;

    /*
    **  If this message is going to the queue or FastSplit is set
    **  and it is the first try and the envelope hasn't split, then we
    **  avoid doing an MX RR lookup now because one will be done when the
    **  message is extracted from the queue later. It can go to the queue
    **  because all messages are going to the queue or this mailer of
    **  the current recipient is marked expensive.
    */

    if (UseMSP || WILL_BE_QUEUED(e->e_sendmode) ||
        (!bitset(EF_SPLIT, e->e_flags) && e->e_ntries == 0 &&
         FastSplit > 0))
        sortfn = sorthost;
    else if (NoConnect && bitnset(M_EXPENSIVE, new->q_mailer->m_flags))
        sortfn = sortexpensive;
    else
        sortfn = sortbysignature;

    for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
    {
        /*
        **  If address is "less than" it should be inserted now.
        **  If address is "greater than" current comparison it'll
        **  insert later in the list; so loop again (if possible).
        **  If address is "equal" (different equal than sameaddr()
        **  call) then check if sameaddr() will be true.
        **  Because this list is now sorted, it'll mean fewer
        **  comparisons and fewer loops which is important for more
        **  recipients.
        */

        i = (*sortfn)(new, q);
        if (i == 0) /* equal */
        {
            /*
            **  Sortbysignature() has said that the two have
            **  equal MX RR's and the same user. Calling sameaddr()
            **  now checks if the two hosts are as identical as the
            **  MX RR's are (which might not be the case)
            **  before saying these are the identical addresses.
            */

            if (sameaddr(q, new) &&
                (bitset(QRCPTOK, q->q_flags) ||
                 !bitset(QPRIMARY, q->q_flags)))
            {
                if (tTd(26, 1))
                {
                    sm_dprintf("%s in sendq: ",
                           new->q_paddr);
                    printaddr(sm_debug_file(), q, false);
                }
                if (!bitset(QPRIMARY, q->q_flags))
                {
                    if (!QS_IS_DEAD(new->q_state))
                        message("duplicate suppressed");
                    else
                        q->q_state = QS_DUPLICATE;
                    q->q_flags |= new->q_flags;
                }
                else if (bitset(QSELFREF, q->q_flags)
                     || q->q_state == QS_REMOVED)
                {
                    /*
                    **  If an earlier milter removed the
                    **  address, a later one can still add
                    **  it back.
                    */

                    q->q_state = new->q_state;
                    q->q_flags |= new->q_flags;
                }
                new = q;
                goto done;
            }
        }
        else if (i < 0) /* less than */
        {
            insert = true;
            break;
        }
        prev = pq;
    }

    /* pq should point to an address, never NULL */
    SM_ASSERT(pq != NULL);

    /* add address on list */
    if (insert)
    {
        /*
        **  insert before 'pq'. Only possible when at least 1
        **  ADDRESS is in the list already.
        */

        new->q_next = *pq;
        if (prev == NULL)
            *sendq = new; /* To be the first ADDRESS */
        else
            (*prev)->q_next = new;
    }
    else
    {
        /*
        **  Place in list at current 'pq' position. Possible
        **  when there are 0 or more ADDRESS's in the list.
        */

        new->q_next = NULL;
        *pq = new;
    }

    /* added a new address: clear split flag */
    e->e_flags &= ~EF_SPLIT;

    /*
    **  Alias the name and handle special mailer types.
    */

  trylocaluser:
    if (tTd(29, 7))
    {
        sm_dprintf("at trylocaluser: ");
        printaddr(sm_debug_file(), new, false);
    }

    if (!QS_IS_OK(new->q_state))
    {
        if (QS_IS_UNDELIVERED(new->q_state))
            e->e_nrcpts++;
        goto testselfdestruct;
    }

    if (m == InclMailer)
    {
        new->q_state = QS_INCLUDED;
        if (new->q_alias == NULL || UseMSP ||
            bitset(EF_UNSAFE, e->e_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            usrerrenh(new->q_status,
                  "550 Cannot mail directly to :include:s");
        }
        else
        {
            int ret;

            message("including file %s", new->q_user);
            ret = include(new->q_user, false, new,
                      sendq, aliaslevel, e);
            if (transienterror(ret))
            {
                if (LogLevel > 2)
                    sm_syslog(LOG_ERR, e->e_id,
                          "include %s: transient error: %s",
                          shortenstring(new->q_user,
                                MAXSHORTSTR),
                                sm_errstring(ret));
                new->q_state = QS_QUEUEUP;
                usrerr("451 4.2.4 Cannot open %s: %s",
                    shortenstring(new->q_user,
                              MAXSHORTSTR),
                    sm_errstring(ret));
            }
            else if (ret != 0)
            {
                new->q_state = QS_BADADDR;
                new->q_status = "5.2.4";
                usrerrenh(new->q_status,
                      "550 Cannot open %s: %s",
                      shortenstring(new->q_user,
                            MAXSHORTSTR),
                      sm_errstring(ret));
            }
        }
    }
    else if (m == FileMailer)
    {
        /* check if allowed */
        if (new->q_alias == NULL || UseMSP ||
            bitset(EF_UNSAFE, e->e_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            usrerrenh(new->q_status,
                  "550 Cannot mail directly to files");
        }
        else if (bitset(QBOGUSSHELL, new->q_alias->q_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            if (new->q_alias->q_ruser == NULL)
                usrerrenh(new->q_status,
                      "550 UID %d is an unknown user: cannot mail to files",
                      new->q_alias->q_uid);
            else
                usrerrenh(new->q_status,
                      "550 User %s@%s doesn't have a valid shell for mailing to files",
                      new->q_alias->q_ruser, MyHostName);
        }
        else if (bitset(QUNSAFEADDR, new->q_alias->q_flags))
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.7.1";
            new->q_rstatus = "550 Unsafe for mailing to files";
            usrerrenh(new->q_status,
                  "550 Address %s is unsafe for mailing to files",
                  new->q_alias->q_paddr);
        }
    }

    /* try aliasing */
    if (!quoted && QS_IS_OK(new->q_state) &&
        bitnset(M_ALIASABLE, m->m_flags))
        alias(new, sendq, aliaslevel, e);

#if USERDB
    /* if not aliased, look it up in the user database */
    if (!bitset(QNOTREMOTE, new->q_flags) &&
        QS_IS_SENDABLE(new->q_state) &&
        bitnset(M_CHECKUDB, m->m_flags))
    {
        if (udbexpand(new, sendq, aliaslevel, e) == EX_TEMPFAIL)
        {
            new->q_state = QS_QUEUEUP;
            if (e->e_message == NULL)
                e->e_message = "Deferred: user database error";
            if (new->q_message == NULL)
                new->q_message = "Deferred: user database error";
            if (LogLevel > 8)
                sm_syslog(LOG_INFO, e->e_id,
                      "deferred: udbexpand: %s",
                      sm_errstring(errno));
            message("queued (user database error): %s",
                sm_errstring(errno));
            e->e_nrcpts++;
            goto testselfdestruct;
        }
    }
#endif /* USERDB */

    /*
    **  If we have a level two config file, then pass the name through
    **  Ruleset 5 before sending it off.  Ruleset 5 has the right
    **  to rewrite it to another mailer.  This gives us a hook
    **  after local aliasing has been done.
    */

    if (tTd(29, 5))
    {
        sm_dprintf("recipient: testing local?  cl=%d, rr5=%p\n\t",
               ConfigLevel, RewriteRules[5]);
        printaddr(sm_debug_file(), new, false);
    }
    if (ConfigLevel >= 2 && RewriteRules[5] != NULL &&
        bitnset(M_TRYRULESET5, m->m_flags) &&
        !bitset(QNOTREMOTE, new->q_flags) &&
        QS_IS_OK(new->q_state))
    {
        maplocaluser(new, sendq, aliaslevel + 1, e);
    }

    /*
    **  If it didn't get rewritten to another mailer, go ahead
    **  and deliver it.
    */

    if (QS_IS_OK(new->q_state) &&
        bitnset(M_HASPWENT, m->m_flags))
    {
        auto bool fuzzy;
        SM_MBDB_T user;
        int status;

        /* warning -- finduser may trash buf */
        status = finduser(buf, &fuzzy, &user);
        switch (status)
        {
          case EX_TEMPFAIL:
            new->q_state = QS_QUEUEUP;
            new->q_status = "4.5.2";
            giveresponse(EX_TEMPFAIL, new->q_status, m, NULL,
                     new->q_alias, (time_t) 0, e, new);
            break;
          default:
            new->q_state = QS_BADADDR;
            new->q_status = "5.1.1";
            new->q_rstatus = "550 5.1.1 User unknown";
            giveresponse(EX_NOUSER, new->q_status, m, NULL,
                     new->q_alias, (time_t) 0, e, new);
            break;
          case EX_OK:
            if (fuzzy)
            {
                /* name was a fuzzy match */
                new->q_user = sm_rpool_strdup_x(e->e_rpool,
                                user.mbdb_name);
                if (findusercount++ > 3)
                {
                    new->q_state = QS_BADADDR;
                    new->q_status = "5.4.6";
                    usrerrenh(new->q_status,
                          "554 aliasing/forwarding loop for %s broken",
                          user.mbdb_name);
                    goto done;
                }

                /* see if it aliases */
                (void) sm_strlcpy(buf, user.mbdb_name, buflen);
                goto trylocaluser;
            }
            if (*user.mbdb_homedir == '\0')
                new->q_home = NULL;
            else if (strcmp(user.mbdb_homedir, "/") == 0)
                new->q_home = "";
            else
                new->q_home = sm_rpool_strdup_x(e->e_rpool,
                            user.mbdb_homedir);
            if (user.mbdb_uid != SM_NO_UID)
            {
                new->q_uid = user.mbdb_uid;
                new->q_gid = user.mbdb_gid;
                new->q_flags |= QGOODUID;
            }
            new->q_ruser = sm_rpool_strdup_x(e->e_rpool,
                             user.mbdb_name);
            if (user.mbdb_fullname[0] != '\0')
                new->q_fullname = sm_rpool_strdup_x(e->e_rpool,
                            user.mbdb_fullname);
            if (!usershellok(user.mbdb_name, user.mbdb_shell))
            {
                new->q_flags |= QBOGUSSHELL;
            }
            if (bitset(EF_VRFYONLY, e->e_flags))
            {
                /* don't do any more now */
                new->q_state = QS_VERIFIED;
            }
            else if (!quoted)
                forward(new, sendq, aliaslevel, e);
        }
    }
    if (!QS_IS_DEAD(new->q_state))
        e->e_nrcpts++;

  testselfdestruct:
    new->q_flags |= QTHISPASS;
    if (tTd(26, 8))
    {
        sm_dprintf("testselfdestruct: ");
        printaddr(sm_debug_file(), new, false);
        if (tTd(26, 10))
        {
            sm_dprintf("SENDQ:\n");
            printaddr(sm_debug_file(), *sendq, true);
            sm_dprintf("----\n");
        }
    }
    if (new->q_alias == NULL && new != &e->e_from &&
        QS_IS_DEAD(new->q_state))
    {
        for (q = *sendq; q != NULL; q = q->q_next)
        {
            if (!QS_IS_DEAD(q->q_state))
                break;
        }
        if (q == NULL)
        {
            new->q_state = QS_BADADDR;
            new->q_status = "5.4.6";
            usrerrenh(new->q_status,
                  "554 aliasing/forwarding loop broken");
        }
    }

  done:
    new->q_flags |= QTHISPASS;
    if (buf != buf0)
        sm_free(buf); /* XXX leak if above code raises exception */

    /*
    **  If we are at the top level, check to see if this has
    **  expanded to exactly one address.  If so, it can inherit
    **  the primaryness of the address.
    **
    **  While we're at it, clear the QTHISPASS bits.
    */

    if (aliaslevel == 0)
    {
        int nrcpts = 0;
        ADDRESS *only = NULL;

        for (q = *sendq; q != NULL; q = q->q_next)
        {
            if (bitset(QTHISPASS, q->q_flags) &&
                QS_IS_SENDABLE(q->q_state))
            {
                nrcpts++;
                only = q;
            }
            q->q_flags &= ~QTHISPASS;
        }
        if (nrcpts == 1)
        {
            /* check to see if this actually got a new owner */
            q = only;
            while ((q = q->q_alias) != NULL)
            {
                if (q->q_owner != NULL)
                    break;
            }
            if (q == NULL)
                only->q_flags |= QPRIMARY;
        }
        else if (!initialdontsend && nrcpts > 0)
        {
            /* arrange for return receipt */
            e->e_flags |= EF_SENDRECEIPT;
            new->q_flags |= QEXPANDED;
            if (e->e_xfp != NULL &&
                bitset(QPINGONSUCCESS, new->q_flags))
                (void) sm_io_fprintf(e->e_xfp, SM_TIME_DEFAULT,
                             "%s... expanded to multiple addresses\n",
                             new->q_paddr);
        }
    }
    new->q_flags |= QRCPTOK;
    (void) sm_snprintf(buf0, sizeof buf0, "%d", e->e_nrcpts);
    macdefine(&e->e_macro, A_TEMP, macid("{nrcpts}"), buf0);
    return new;
}
/*
**  FINDUSER -- find the password entry for a user.
**
**  This looks a lot like getpwnam, except that it may want to
**  do some fancier pattern matching in /etc/passwd.
**
**  This routine contains most of the time of many sendmail runs.
**  It deserves to be optimized.
**
**  Parameters:
**      name -- the name to match against.
**      fuzzyp -- an outarg that is set to true if this entry
**          was found using the fuzzy matching algorithm;
**          set to false otherwise.
**      user -- structure to fill in if user is found
**
**  Returns:
**      On success, fill in *user, set *fuzzyp and return EX_OK.
**      If the user was not found, return EX_NOUSER.
**      On error, return EX_TEMPFAIL or EX_OSERR.
**
**  Side Effects:
**      may modify name.
*/

int
finduser(name, fuzzyp, user)
    char *name;
    bool *fuzzyp;
    SM_MBDB_T *user;
{
#if MATCHGECOS
    register struct passwd *pw;
#endif /* MATCHGECOS */
    register char *p;
    bool tryagain;
    int status;

    if (tTd(29, 4))
        sm_dprintf("finduser(%s): ", name);

    *fuzzyp = false;

#if HESIOD
    /* DEC Hesiod getpwnam accepts numeric strings -- short circuit it */
    for (p = name; *p != '\0'; p++)
        if (!isascii(*p) || !isdigit(*p))
            break;
    if (*p == '\0')
    {
        if (tTd(29, 4))
            sm_dprintf("failed (numeric input)\n");
        return EX_NOUSER;
    }
#endif /* HESIOD */

    /* look up this login name using fast path */
    status = sm_mbdb_lookup(name, user);
    if (status != EX_NOUSER)
    {
        if (tTd(29, 4))
            sm_dprintf("%s (non-fuzzy)\n", sm_strexit(status));
        return status;
    }

    /* try mapping it to lower case */
    tryagain = false;
    for (p = name; *p != '\0'; p++)
    {
        if (isascii(*p) && isupper(*p))
        {
            *p = tolower(*p);
            tryagain = true;
        }
    }
    if (tryagain && (status = sm_mbdb_lookup(name, user)) != EX_NOUSER)
    {
        if (tTd(29, 4))
            sm_dprintf("%s (lower case)\n", sm_strexit(status));
        *fuzzyp = true;
        return status;
    }

#if MATCHGECOS
    /* see if fuzzy matching allowed */
    if (!MatchGecos)
    {
        if (tTd(29, 4))
            sm_dprintf("not found (fuzzy disabled)\n");
        return EX_NOUSER;
    }

    /* search for a matching full name instead */
    for (p = name; *p != '\0'; p++)
    {
        if (*p == (SpaceSub & 0177) || *p == '_')
            *p = ' ';
    }
    (void) setpwent();
    while ((pw = getpwent()) != NULL)
    {
        char buf[MAXNAME + 1];

# if 0
        if (sm_strcasecmp(pw->pw_name, name) == 0)
        {
            if (tTd(29, 4))
                sm_dprintf("found (case wrapped)\n");
            break;
        }
# endif /* 0 */

        sm_pwfullname(pw->pw_gecos, pw->pw_name, buf, sizeof buf);
        if (strchr(buf, ' ') != NULL && sm_strcasecmp(buf, name) == 0)
        {
            if (tTd(29, 4))
                sm_dprintf("fuzzy matches %s\n", pw->pw_name);
            message("sending to login name %s", pw->pw_name);
            break;
        }
    }
    if (pw != NULL)
        *fuzzyp = true;
    else if (tTd(29, 4))
        sm_dprintf("no fuzzy match found\n");
# if DEC_OSF_BROKEN_GETPWENT    /* DEC OSF/1 3.2 or earlier */
    endpwent();
# endif /* DEC_OSF_BROKEN_GETPWENT */
    if (pw == NULL)
        return EX_NOUSER;
    sm_mbdb_frompw(user, pw);
    return EX_OK;
#else /* MATCHGECOS */
    if (tTd(29, 4))
        sm_dprintf("not found (fuzzy disabled)\n");
    return EX_NOUSER;
#endif /* MATCHGECOS */
}
/*
**  WRITABLE -- predicate returning if the file is writable.
**
**  This routine must duplicate the algorithm in sys/fio.c.
**  Unfortunately, we cannot use the access call since we
**  won't necessarily be the real uid when we try to
**  actually open the file.
**
**  Notice that ANY file with ANY execute bit is automatically
**  not writable.  This is also enforced by mailfile.
**
**  Parameters:
**      filename -- the file name to check.
**      ctladdr -- the controlling address for this file.
**      flags -- SFF_* flags to control the function.
**
**  Returns:
**      true -- if we will be able to write this file.
**      false -- if we cannot write this file.
**
**  Side Effects:
**      none.
*/

bool
writable(filename, ctladdr, flags)
    char *filename;
    ADDRESS *ctladdr;
    long flags;
{
    uid_t euid = 0;
    gid_t egid = 0;
    char *user = NULL;

    if (tTd(44, 5))
        sm_dprintf("writable(%s, 0x%lx)\n", filename, flags);

    /*
    **  File does exist -- check that it is writable.
    */

    if (geteuid() != 0)
    {
        euid = geteuid();
        egid = getegid();
        user = NULL;
    }
    else if (ctladdr != NULL)
    {
        euid = ctladdr->q_uid;
        egid = ctladdr->q_gid;
        user = ctladdr->q_user;
    }
    else if (bitset(SFF_RUNASREALUID, flags))
    {
        euid = RealUid;
        egid = RealGid;
        user = RealUserName;
    }
    else if (FileMailer != NULL && !bitset(SFF_ROOTOK, flags))
    {
        if (FileMailer->m_uid == NO_UID)
        {
            euid = DefUid;
            user = DefUser;
        }
        else
        {
            euid = FileMailer->m_uid;
            user = NULL;
        }
        if (FileMailer->m_gid == NO_GID)
            egid = DefGid;
        else
            egid = FileMailer->m_gid;
    }
    else
    {
        euid = egid = 0;
        user = NULL;
    }
    if (!bitset(SFF_ROOTOK, flags))
    {
        if (euid == 0)
        {
            euid = DefUid;
            user = DefUser;
        }
        if (egid == 0)
            egid = DefGid;
    }
    if (geteuid() == 0 &&
        (ctladdr == NULL || !bitset(QGOODUID, ctladdr->q_flags)))
        flags |= SFF_SETUIDOK;

    if (!bitnset(DBS_FILEDELIVERYTOSYMLINK, DontBlameSendmail))
        flags |= SFF_NOSLINK;
    if (!bitnset(DBS_FILEDELIVERYTOHARDLINK, DontBlameSendmail))
        flags |= SFF_NOHLINK;

    errno = safefile(filename, euid, egid, user, flags, S_IWRITE, NULL);
    return errno == 0;
}
/*
**  INCLUDE -- handle :include: specification.
**
**  Parameters:
**      fname -- filename to include.
**      forwarding -- if true, we are reading a .forward file.
**          if false, it's a :include: file.
**      ctladdr -- address template to use to fill in these
**          addresses -- effective user/group id are
**          the important things.
**      sendq -- a pointer to the head of the send queue
**          to put these addresses in.
**      aliaslevel -- the alias nesting depth.
**      e -- the current envelope.
**
**  Returns:
**      open error status
**
**  Side Effects:
**      reads the :include: file and sends to everyone
**      listed in that file.
**
**  Security Note:
**      If you have restricted chown (that is, you can't
**      give a file away), it is reasonable to allow programs
**      and files called from this :include: file to be to be
**      run as the owner of the :include: file.  This is bogus
**      if there is any chance of someone giving away a file.
**      We assume that pre-POSIX systems can give away files.
**
**      There is an additional restriction that if you
**      forward to a :include: file, it will not take on
**      the ownership of the :include: file.  This may not
**      be necessary, but shouldn't hurt.
*/

static jmp_buf  CtxIncludeTimeout;

int
include(fname, forwarding, ctladdr, sendq, aliaslevel, e)
    char *fname;
    bool forwarding;
    ADDRESS *ctladdr;
    ADDRESS **sendq;
    int aliaslevel;
    ENVELOPE *e;
{
    SM_FILE_T *volatile fp = NULL;
    char *oldto = e->e_to;
    char *oldfilename = FileName;
    int oldlinenumber = LineNumber;
    register SM_EVENT *ev = NULL;
    int nincludes;
    int mode;
    volatile bool maxreached = false;
    register ADDRESS *ca;
    volatile uid_t saveduid;
    volatile gid_t savedgid;
    volatile uid_t uid;
    volatile gid_t gid;
    char *volatile user;
    int rval = 0;
    volatile long sfflags = SFF_REGONLY;
    register char *p;
    bool safechown = false;
    volatile bool safedir = false;
    struct stat st;
    char buf[MAXLINE];

    if (tTd(27, 2))
        sm_dprintf("include(%s)\n", fname);
    if (tTd(27, 4))
        sm_dprintf("   ruid=%d euid=%d\n",
            (int) getuid(), (int) geteuid());
    if (tTd(27, 14))
    {
        sm_dprintf("ctladdr ");
        printaddr(sm_debug_file(), ctladdr, false);
    }

    if (tTd(27, 9))
        sm_dprintf("include: old uid = %d/%d\n",
               (int) getuid(), (int) geteuid());

    if (forwarding)
    {
        sfflags |= SFF_MUSTOWN|SFF_ROOTOK;
        if (!bitnset(DBS_GROUPWRITABLEFORWARDFILE, DontBlameSendmail))
            sfflags |= SFF_NOGWFILES;
        if (!bitnset(DBS_WORLDWRITABLEFORWARDFILE, DontBlameSendmail))
            sfflags |= SFF_NOWWFILES;
    }
    else
    {
        if (!bitnset(DBS_GROUPWRITABLEINCLUDEFILE, DontBlameSendmail))
            sfflags |= SFF_NOGWFILES;
        if (!bitnset(DBS_WORLDWRITABLEINCLUDEFILE, DontBlameSendmail))
            sfflags |= SFF_NOWWFILES;
    }

    /*
    **  If RunAsUser set, won't be able to run programs as user
    **  so mark them as unsafe unless the administrator knows better.
    */

    if ((geteuid() != 0 || RunAsUid != 0) &&
        !bitnset(DBS_NONROOTSAFEADDR, DontBlameSendmail))
    {
        if (tTd(27, 4))
            sm_dprintf("include: not safe (euid=%d, RunAsUid=%d)\n",
                   (int) geteuid(), (int) RunAsUid);
        ctladdr->q_flags |= QUNSAFEADDR;
    }

    ca = getctladdr(ctladdr);
    if (ca == NULL ||
        (ca->q_uid == DefUid && ca->q_gid == 0))
    {
        uid = DefUid;
        gid = DefGid;
        user = DefUser;
    }
    else
    {
        uid = ca->q_uid;
        gid = ca->q_gid;
        user = ca->q_user;
    }
#if MAILER_SETUID_METHOD != USE_SETUID
    saveduid = geteuid();
    savedgid = getegid();
    if (saveduid == 0)
    {
        if (!DontInitGroups)
        {
            if (initgroups(user, gid) == -1)
            {
                rval = EAGAIN;
                syserr("include: initgroups(%s, %d) failed",
                    user, gid);
                goto resetuid;
            }
        }
        else
        {
            GIDSET_T gidset[1];

            gidset[0] = gid;
            if (setgroups(1, gidset) == -1)
            {
                rval = EAGAIN;
                syserr("include: setgroups() failed");
                goto resetuid;
            }
        }

        if (gid != 0 && setgid(gid) < -1)
        {
            rval = EAGAIN;
            syserr("setgid(%d) failure", gid);
            goto resetuid;
        }
        if (uid != 0)
        {
# if MAILER_SETUID_METHOD == USE_SETEUID
            if (seteuid(uid) < 0)
            {
                rval = EAGAIN;
                syserr("seteuid(%d) failure (real=%d, eff=%d)",
                    uid, (int) getuid(), (int) geteuid());
                goto resetuid;
            }
# endif /* MAILER_SETUID_METHOD == USE_SETEUID */
# if MAILER_SETUID_METHOD == USE_SETREUID
            if (setreuid(0, uid) < 0)
            {
                rval = EAGAIN;
                syserr("setreuid(0, %d) failure (real=%d, eff=%d)",
                    uid, (int) getuid(), (int) geteuid());
                goto resetuid;
            }
# endif /* MAILER_SETUID_METHOD == USE_SETREUID */
        }
    }
#endif /* MAILER_SETUID_METHOD != USE_SETUID */

    if (tTd(27, 9))
        sm_dprintf("include: new uid = %d/%d\n",
               (int) getuid(), (int) geteuid());

    /*
    **  If home directory is remote mounted but server is down,
    **  this can hang or give errors; use a timeout to avoid this
    */

    if (setjmp(CtxIncludeTimeout) != 0)
    {
        ctladdr->q_state = QS_QUEUEUP;
        errno = 0;

        /* return pseudo-error code */
        rval = E_SM_OPENTIMEOUT;
        goto resetuid;
    }
    if (TimeOuts.to_fileopen > 0)
        ev = sm_setevent(TimeOuts.to_fileopen, includetimeout, 0);
    else
        ev = NULL;


    /* check for writable parent directory */
    p = strrchr(fname, '/');
    if (p != NULL)
    {
        int ret;

        *p = '\0';
        ret = safedirpath(fname, uid, gid, user,
                  sfflags|SFF_SAFEDIRPATH, 0, 0);
        if (ret == 0)
        {
            /* in safe directory: relax chown & link rules */
            safedir = true;
            sfflags |= SFF_NOPATHCHECK;
        }
        else
        {
            if (bitnset((forwarding ?
                     DBS_FORWARDFILEINUNSAFEDIRPATH :
                     DBS_INCLUDEFILEINUNSAFEDIRPATH),
                    DontBlameSendmail))
                sfflags |= SFF_NOPATHCHECK;
            else if (bitnset((forwarding ?
                      DBS_FORWARDFILEINGROUPWRITABLEDIRPATH :
                      DBS_INCLUDEFILEINGROUPWRITABLEDIRPATH),
                     DontBlameSendmail) &&
                 ret == E_SM_GWDIR)
            {
                setbitn(DBS_GROUPWRITABLEDIRPATHSAFE,
                    DontBlameSendmail);
                ret = safedirpath(fname, uid, gid, user,
                          sfflags|SFF_SAFEDIRPATH,
                          0, 0);
                clrbitn(DBS_GROUPWRITABLEDIRPATHSAFE,
                    DontBlameSendmail);
                if (ret == 0)
                    sfflags |= SFF_NOPATHCHECK;
                else
                    sfflags |= SFF_SAFEDIRPATH;
            }
            else
                sfflags |= SFF_SAFEDIRPATH;
            if (ret > E_PSEUDOBASE &&
                !bitnset((forwarding ?
                      DBS_FORWARDFILEINUNSAFEDIRPATHSAFE :
                      DBS_INCLUDEFILEINUNSAFEDIRPATHSAFE),
                     DontBlameSendmail))
            {
                if (LogLevel > 11)
                    sm_syslog(LOG_INFO, e->e_id,
                          "%s: unsafe directory path, marked unsafe",
                          shortenstring(fname, MAXSHORTSTR));
                ctladdr->q_flags |= QUNSAFEADDR;
            }
        }
        *p = '/';
    }

    /* allow links only in unwritable directories */
    if (!safedir &&
        !bitnset((forwarding ?
              DBS_LINKEDFORWARDFILEINWRITABLEDIR :
              DBS_LINKEDINCLUDEFILEINWRITABLEDIR),
             DontBlameSendmail))
        sfflags |= SFF_NOLINK;

    rval = safefile(fname, uid, gid, user, sfflags, S_IREAD, &st);
    if (rval != 0)
    {
        /* don't use this :include: file */
        if (tTd(27, 4))
            sm_dprintf("include: not safe (uid=%d): %s\n",
                   (int) uid, sm_errstring(rval));
    }
    else if ((fp = sm_io_open(SmFtStdio, SM_TIME_DEFAULT, fname,
                  SM_IO_RDONLY, NULL)) == NULL)
    {
        rval = errno;
        if (tTd(27, 4))
            sm_dprintf("include: open: %s\n", sm_errstring(rval));
    }
    else if (filechanged(fname, sm_io_getinfo(fp,SM_IO_WHAT_FD, NULL), &st))
    {
        rval = E_SM_FILECHANGE;
        if (tTd(27, 4))
            sm_dprintf("include: file changed after open\n");
    }
    if (ev != NULL)
        sm_clrevent(ev);

resetuid:

#if HASSETREUID || USESETEUID
    if (saveduid == 0)
    {
        if (uid != 0)
        {
# if USESETEUID
            if (seteuid(0) < 0)
                syserr("!seteuid(0) failure (real=%d, eff=%d)",
                       (int) getuid(), (int) geteuid());
# else /* USESETEUID */
            if (setreuid(-1, 0) < 0)
                syserr("!setreuid(-1, 0) failure (real=%d, eff=%d)",
                       (int) getuid(), (int) geteuid());
            if (setreuid(RealUid, 0) < 0)
                syserr("!setreuid(%d, 0) failure (real=%d, eff=%d)",
                       (int) RealUid, (int) getuid(),
                       (int) geteuid());
# endif /* USESETEUID */
        }
        if (setgid(savedgid) < 0)
            syserr("!setgid(%d) failure (real=%d eff=%d)",
                   (int) savedgid, (int) getgid(),
                   (int) getegid());
    }
#endif /* HASSETREUID || USESETEUID */

    if (tTd(27, 9))
        sm_dprintf("include: reset uid = %d/%d\n",
               (int) getuid(), (int) geteuid());

    if (rval == E_SM_OPENTIMEOUT)
        usrerr("451 4.4.1 open timeout on %s", fname);

    if (fp == NULL)
        return rval;

    if (fstat(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), &st) < 0)
    {
        rval = errno;
        syserr("Cannot fstat %s!", fname);
        (void) sm_io_close(fp, SM_TIME_DEFAULT);
        return rval;
    }

    /* if path was writable, check to avoid file giveaway tricks */
    safechown = chownsafe(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), safedir);
    if (tTd(27, 6))
        sm_dprintf("include: parent of %s is %s, chown is %ssafe\n",
               fname, safedir ? "safe" : "dangerous",
               safechown ? "" : "un");

    /* if no controlling user or coming from an alias delivery */
    if (safechown &&
        (ca == NULL ||
         (ca->q_uid == DefUid && ca->q_gid == 0)))
    {
        ctladdr->q_uid = st.st_uid;
        ctladdr->q_gid = st.st_gid;
        ctladdr->q_flags |= QGOODUID;
    }
    if (ca != NULL && ca->q_uid == st.st_uid)
    {
        /* optimization -- avoid getpwuid if we already have info */
        ctladdr->q_flags |= ca->q_flags & QBOGUSSHELL;
        ctladdr->q_ruser = ca->q_ruser;
    }
    else if (!forwarding)
    {
        register struct passwd *pw;

        pw = sm_getpwuid(st.st_uid);
        if (pw == NULL)
        {
            ctladdr->q_uid = st.st_uid;
            ctladdr->q_flags |= QBOGUSSHELL;
        }
        else
        {
            char *sh;

            ctladdr->q_ruser = sm_rpool_strdup_x(e->e_rpool,
                                 pw->pw_name);
            if (safechown)
                sh = pw->pw_shell;
            else
                sh = "/SENDMAIL/ANY/SHELL/";
            if (!usershellok(pw->pw_name, sh))
            {
                if (LogLevel > 11)
                    sm_syslog(LOG_INFO, e->e_id,
                          "%s: user %s has bad shell %s, marked %s",
                          shortenstring(fname,
                                MAXSHORTSTR),
                          pw->pw_name, sh,
                          safechown ? "bogus" : "unsafe");
                if (safechown)
                    ctladdr->q_flags |= QBOGUSSHELL;
                else
                    ctladdr->q_flags |= QUNSAFEADDR;
            }
        }
    }

    if (bitset(EF_VRFYONLY, e->e_flags))
    {
        /* don't do any more now */
        ctladdr->q_state = QS_VERIFIED;
        e->e_nrcpts++;
        (void) sm_io_close(fp, SM_TIME_DEFAULT);
        return rval;
    }

    /*
    **  Check to see if some bad guy can write this file
    **
    **  Group write checking could be more clever, e.g.,
    **  guessing as to which groups are actually safe ("sys"
    **  may be; "user" probably is not).
    */

    mode = S_IWOTH;
    if (!bitnset((forwarding ?
              DBS_GROUPWRITABLEFORWARDFILESAFE :
              DBS_GROUPWRITABLEINCLUDEFILESAFE),
             DontBlameSendmail))
        mode |= S_IWGRP;

    if (bitset(mode, st.st_mode))
    {
        if (tTd(27, 6))
            sm_dprintf("include: %s is %s writable, marked unsafe\n",
                   shortenstring(fname, MAXSHORTSTR),
                   bitset(S_IWOTH, st.st_mode) ? "world"
                                   : "group");
        if (LogLevel > 11)
            sm_syslog(LOG_INFO, e->e_id,
                  "%s: %s writable %s file, marked unsafe",
                  shortenstring(fname, MAXSHORTSTR),
                  bitset(S_IWOTH, st.st_mode) ? "world" : "group",
                  forwarding ? "forward" : ":include:");
        ctladdr->q_flags |= QUNSAFEADDR;
    }

    /* read the file -- each line is a comma-separated list. */
    FileName = fname;
    LineNumber = 0;
    ctladdr->q_flags &= ~QSELFREF;
    nincludes = 0;
    while (sm_io_fgets(fp, SM_TIME_DEFAULT, buf, sizeof buf) != NULL &&
           !maxreached)
    {
        fixcrlf(buf, true);
        LineNumber++;
        if (buf[0] == '#' || buf[0] == '\0')
            continue;

        /* <sp>#@# introduces a comment anywhere */
        /* for Japanese character sets */
        for (p = buf; (p = strchr(++p, '#')) != NULL; )
        {
            if (p[1] == '@' && p[2] == '#' &&
                isascii(p[-1]) && isspace(p[-1]) &&
                (p[3] == '\0' || (isascii(p[3]) && isspace(p[3]))))
            {
                --p;
                while (p > buf && isascii(p[-1]) &&
                       isspace(p[-1]))
                    --p;
                p[0] = '\0';
                break;
            }
        }
        if (buf[0] == '\0')
            continue;

        e->e_to = NULL;
        message("%s to %s",
            forwarding ? "forwarding" : "sending", buf);
        if (forwarding && LogLevel > 10)
            sm_syslog(LOG_INFO, e->e_id,
                  "forward %.200s => %s",
                  oldto, shortenstring(buf, MAXSHORTSTR));

        nincludes += sendtolist(buf, ctladdr, sendq, aliaslevel + 1, e);

        if (forwarding &&
            MaxForwardEntries > 0 &&
            nincludes >= MaxForwardEntries)
        {
            /* just stop reading and processing further entries */
#if 0
            /* additional: (?) */
            ctladdr->q_state = QS_DONTSEND;
#endif /* 0 */

            syserr("Attempt to forward to more than %d addresses (in %s)!",
                MaxForwardEntries, fname);
            maxreached = true;
        }
    }

    if (sm_io_error(fp) && tTd(27, 3))
        sm_dprintf("include: read error: %s\n", sm_errstring(errno));
    if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags))
    {
        if (tTd(27, 5))
        {
            sm_dprintf("include: QS_DONTSEND ");
            printaddr(sm_debug_file(), ctladdr, false);
        }
        ctladdr->q_state = QS_DONTSEND;
    }

    (void) sm_io_close(fp, SM_TIME_DEFAULT);
    FileName = oldfilename;
    LineNumber = oldlinenumber;
    e->e_to = oldto;
    return rval;
}

static void
includetimeout(ignore)
    int ignore;
{
    /*
    **  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
    **  ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
    **  DOING.
    */

    errno = ETIMEDOUT;
    longjmp(CtxIncludeTimeout, 1);
}
/*
**  SENDTOARGV -- send to an argument vector.
**
**  Parameters:
**      argv -- argument vector to send to.
**      e -- the current envelope.
**
**  Returns:
**      none.
**
**  Side Effects:
**      puts all addresses on the argument vector onto the
**          send queue.
*/

void
sendtoargv(argv, e)
    register char **argv;
    register ENVELOPE *e;
{
    register char *p;

    while ((p = *argv++) != NULL)
        (void) sendtolist(p, NULLADDR, &e->e_sendqueue, 0, e);
}
/*
**  GETCTLADDR -- get controlling address from an address header.
**
**  If none, get one corresponding to the effective userid.
**
**  Parameters:
**      a -- the address to find the controller of.
**
**  Returns:
**      the controlling address.
*/

ADDRESS *
getctladdr(a)
    register ADDRESS *a;
{
    while (a != NULL && !bitset(QGOODUID, a->q_flags))
        a = a->q_alias;
    return a;
}
/*
**  SELF_REFERENCE -- check to see if an address references itself
**
**  The check is done through a chain of aliases.  If it is part of
**  a loop, break the loop at the "best" address, that is, the one
**  that exists as a real user.
**
**  This is to handle the case of:
**      awc:        Andrew.Chang
**      Andrew.Chang:   awc@mail.server
**  which is a problem only on mail.server.
**
**  Parameters:
**      a -- the address to check.
**
**  Returns:
**      The address that should be retained.
*/

static ADDRESS *
self_reference(a)
    ADDRESS *a;
{
    ADDRESS *b;     /* top entry in self ref loop */
    ADDRESS *c;     /* entry that point to a real mail box */

    if (tTd(27, 1))
        sm_dprintf("self_reference(%s)\n", a->q_paddr);

    for (b = a->q_alias; b != NULL; b = b->q_alias)
    {
        if (sameaddr(a, b))
            break;
    }

    if (b == NULL)
    {
        if (tTd(27, 1))
            sm_dprintf("\t... no self ref\n");
        return NULL;
    }

    /*
    **  Pick the first address that resolved to a real mail box
    **  i.e has a mbdb entry.  The returned value will be marked
    **  QSELFREF in recipient(), which in turn will disable alias()
    **  from marking it as QS_IS_DEAD(), which mean it will be used
    **  as a deliverable address.
    **
    **  The 2 key thing to note here are:
    **  1) we are in a recursive call sequence:
    **      alias->sendtolist->recipient->alias
    **  2) normally, when we return back to alias(), the address
    **     will be marked QS_EXPANDED, since alias() assumes the
    **     expanded form will be used instead of the current address.
    **     This behaviour is turned off if the address is marked
    **     QSELFREF.  We set QSELFREF when we return to recipient().
    */

    c = a;
    while (c != NULL)
    {
        if (tTd(27, 10))
            sm_dprintf("  %s", c->q_user);
        if (bitnset(M_HASPWENT, c->q_mailer->m_flags))
        {
            SM_MBDB_T user;

            if (tTd(27, 2))
                sm_dprintf("\t... getpwnam(%s)... ", c->q_user);
            if (sm_mbdb_lookup(c->q_user, &user) == EX_OK)
            {
                if (tTd(27, 2))
                    sm_dprintf("found\n");

                /* ought to cache results here */
                if (sameaddr(b, c))
                    return b;
                else
                    return c;
            }
            if (tTd(27, 2))
                sm_dprintf("failed\n");
        }
        else
        {
            /* if local delivery, compare usernames */
            if (bitnset(M_LOCALMAILER, c->q_mailer->m_flags) &&
                b->q_mailer == c->q_mailer)
            {
                if (tTd(27, 2))
                    sm_dprintf("\t... local match (%s)\n",
                        c->q_user);
                if (sameaddr(b, c))
                    return b;
                else
                    return c;
            }
        }
        if (tTd(27, 10))
            sm_dprintf("\n");
        c = c->q_alias;
    }

    if (tTd(27, 1))
        sm_dprintf("\t... cannot break loop for \"%s\"\n", a->q_paddr);

    return NULL;
}