smail.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

    return (result == NOTOK ? RP_BHST : RP_OK);
}

/*  */

int     sm_wtend () {
    if (sm_wstream ((char *) NULL, 0) == NOTOK)
	return RP_BHST;

    switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
	case 250: 
	case 251: 
	    return RP_OK;

	case 451: 
#ifdef SENDMAILBUG
	    return RP_OK;
#endif SENDMAILBUG
	case 452: 
	default: 
	    return RP_NO;

	case 552: 
	case 554: 
	    return RP_NDEL;
    }
}

/*  */

int     sm_end (type)
register int     type;
{
    register int    status;
    struct smtp sm_note;

#ifndef	SMTP
    switch (sm_child) {
	case NOTOK: 
	case OK: 
	    return RP_OK;

	default: 
	    break;
    }
#endif	not SMTP
    if (sm_rfp == NULL && sm_wfp == NULL)
	return RP_OK;

    switch (type) {
	case OK: 
	    (void) smtalk (SM_QUIT, "QUIT");
	    break;

	case NOTOK: 
	    sm_note.code = sm_reply.code;
	    (void) strncpy (sm_note.text, sm_reply.text,
		    sm_note.length = sm_reply.length);/* fall */
	case DONE: 
	    if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
		return RP_OK;
#ifndef	SMTP
	    (void) kill (sm_child, SIGKILL);
	    discard (sm_rfp);
	    discard (sm_wfp);
#else	SMTP
	    (void) smtalk (SM_QUIT, "QUIT");
#endif	not SMTP
	    if (type == NOTOK) {
		sm_reply.code = sm_note.code;
		(void) strncpy (sm_reply.text, sm_note.text,
			sm_reply.length = sm_note.length);
	    }
	    break;
    }
    if (sm_rfp != NULL) {
	(void) alarm (SM_CLOS);
	(void) fclose (sm_rfp);
	(void) alarm (0);
    }
    if (sm_wfp != NULL) {
	(void) alarm (SM_CLOS);
	(void) fclose (sm_wfp);
	(void) alarm (0);
    }

#ifndef	SMTP
    status = pidwait (sm_child);

    sm_child = NOTOK;
#else	SMTP
    status = 0;
#endif	SMTP
    sm_rfp = sm_wfp = NULL;

    return (status ? RP_BHST : RP_OK);
}

/*  */

/* VARARGS */

static int  sm_ierror (fmt, a, b, c, d)
char   *fmt,
       *a,
       *b,
       *c,
       *d;
{
    (void) sprintf (sm_reply.text, fmt, a, b, c, d);
    sm_reply.length = strlen (sm_reply.text);
    sm_reply.code = NOTOK;

    return RP_BHST;
}

/*  */

/* VARARGS2 */

static int  smtalk (time, fmt, a, b, c, d)
register int     time;
register char   *fmt;
{
    register int    result;
    char    buffer[BUFSIZ];

    (void) sprintf (buffer, fmt, a, b, c, d);
    if (sm_debug) {
	printf ("=> %s\n", buffer);
	(void) fflush (stdout);
    }

    sm_alarmed = 0;
    (void) alarm ((unsigned) time);
    if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
	result = smhear ();
    (void) alarm (0);

    return result;
}

/*  */

static int  sm_wrecord (buffer, len)
register char   *buffer;
register int     len;
{
    if (sm_wfp == NULL)
	return sm_werror ();

    (void) fwrite (buffer, sizeof *buffer, len, sm_wfp);
    fputs ("\r\n", sm_wfp);
    (void) fflush (sm_wfp);

    return (ferror (sm_wfp) ? sm_werror () : OK);
}

/*  */

static int  sm_wstream (buffer, len)
register char   *buffer;
register int     len;
{
    register char  *bp;
    static char lc = NULL;

    if (sm_wfp == NULL)
	return sm_werror ();

    if (buffer == NULL && len == 0) {
	if (lc != '\n')
	    fputs ("\r\n", sm_wfp);
	lc = NULL;
	return (ferror (sm_wfp) ? sm_werror () : OK);
    }

    for (bp = buffer; len > 0; bp++, len--) {
	switch (*bp) {
	    case '\n': 
		sm_nl = TRUE;
		(void) fputc ('\r', sm_wfp);
		break;

	    case '.': 
		if (sm_nl)
		    (void) fputc ('.', sm_wfp);/* FALL THROUGH */
	    default: 
		sm_nl = FALSE;
	}
	(void) fputc (*bp, sm_wfp);
	if (ferror (sm_wfp))
	    return sm_werror ();
    }

    if (bp > buffer)
	lc = *--bp;
    return (ferror (sm_wfp) ? sm_werror () : OK);
}

/*  */

static int  sm_werror () {
    sm_reply.length =
#ifdef	SMTP
	strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
	    : sm_alarmed ? "write to socket timed out"
	    : "error writing to socket"));
#else	not SMTP
	strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no pipe opened"
	    : sm_alarmed ? "write to pipe timed out"
	    : "error writing to pipe"));
#endif	not SMTP

    return (sm_reply.code = NOTOK);
}

/*  */

static int  smhear () {
    register int    i,
                    code,
                    cont,
		    rc,
		    more;
    int     bc;
    register char  *bp,
                   *rp;
    char    buffer[BUFSIZ];

again: ;

    sm_reply.text[sm_reply.length = 0] = NULL;

    rp = sm_reply.text, rc = sizeof sm_reply.text - 1;
    for (more = FALSE; sm_rrecord (bp = buffer, &bc) != NOTOK;) {
	if (sm_debug) {
	    printf ("<= %s\n", buffer);
	    (void) fflush (stdout);
	}

	for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
	    continue;

	cont = FALSE;
	code = atoi (bp);
	bp += 3, bc -= 3;
	for (; bc > 0 && isspace (*bp); bp++, bc--)
	    continue;
	if (bc > 0 && *bp == '-') {
	    cont = TRUE;
	    bp++, bc--;
	    for (; bc > 0 && isspace (*bp); bp++, bc--)
		continue;
	}

	if (more) {
	    if (code != sm_reply.code || cont)
		continue;
	    more = FALSE;
	}
	else {
	    sm_reply.code = code;
	    more = cont;
	    if (bc <= 0) {
		(void) strcpy (bp = buffer, sm_noreply);
		bc = strlen (sm_noreply);
	    }
	}
	if ((i = min (bc, rc)) > 0) {
	    (void) strncpy (rp, bp, i);
	    rp += i, rc -= i;
	    if (more && rc > strlen (sm_moreply) + 1) {
		(void) strcpy (sm_reply.text + rc, sm_moreply);
		rc += strlen (sm_moreply);
	    }
	}
	if (more)
	    continue;
	if (sm_reply.code < 100) {
	    if (sm_verbose) {
		printf ("%s\n", sm_reply.text);
		(void) fflush (stdout);
	    }
	    goto again;
	}

	sm_reply.length = rp - sm_reply.text;
	return sm_reply.code;
    }

    return NOTOK;
}

/*  */

static int  sm_rrecord (buffer, len)
register char   *buffer;
register int    *len;
{
    if (sm_rfp == NULL)
	return sm_rerror ();

    buffer[*len = 0] = NULL;

    (void) fgets (buffer, BUFSIZ, sm_rfp);
    *len = strlen (buffer);
    if (ferror (sm_rfp) || feof (sm_rfp))
	return sm_rerror ();
    if (buffer[*len - 1] != '\n')
	while (getc (sm_rfp) != '\n' && !ferror (sm_rfp) && !feof (sm_rfp))
	    continue;
    else
	if (buffer[*len - 2] == '\r')
	    *len -= 1;
    buffer[*len - 1] = NULL;

    return OK;
}

/*  */

static int  sm_rerror () {
    sm_reply.length =
#ifdef	SMTP
	strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
	    : sm_alarmed ? "read from socket timed out"
	    : feof (sm_rfp) ? "premature end-of-file on socket"
	    : "error reading from socket"));
#else	not SMTP
	strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
	    : sm_alarmed ? "read from pipe timed out"
	    : feof (sm_rfp) ? "premature end-of-file on pipe"
	    : "error reading from pipe"));
#endif	not SMTP

    return (sm_reply.code = NOTOK);
}

/*  */

/* ARGSUSED */

static	int alrmser (i)
int     i;
{
#ifndef	BSD42
    signal (SIGALRM, alrmser);
#endif	BSD42
    sm_alarmed++;

    if (sm_debug) {
	printf ("timed out...\n");
	(void) fflush (stdout);
    }
}

/*  */

char   *rp_string (code)
register int     code;
{
    register char  *text;
    static char buffer[BUFSIZ];

    switch (sm_reply.code != NOTOK ? code : NOTOK) {
	case RP_AOK:
	    text = "AOK";
	    break;

	case RP_MOK:
	    text = "MOK";
	    break;

	case RP_OK: 
	    text = "OK";
	    break;

	case RP_RPLY: 
	    text = "RPLY";
	    break;

	case RP_BHST: 
	default: 
	    text = "BHST";
	    (void) sprintf (buffer, "[%s] %s", text, sm_reply.text);
	    return buffer;

	case RP_PARM: 
	    text = "PARM";
	    break;

	case RP_NO: 
	    text = "NO";
	    break;

	case RP_USER: 
	    text = "USER";
	    break;

	case RP_NDEL: 
	    text = "NDEL";
	    break;
    }

    (void) sprintf (buffer, "[%s] %3d %s", text, sm_reply.code, sm_reply.text);
    return buffer;
}