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      1 /*	$NetBSD: msg_stats_scan.c,v 1.3 2022/10/08 16:12:45 christos Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	msg_stats_scan
      6 /* SUMMARY
      7 /*	read MSG_STATS from stream
      8 /* SYNOPSIS
      9 /*	#include <msg_stats.h>
     10 /*
     11 /*	int	msg_stats_scan(scan_fn, stream, flags, ptr)
     12 /*	ATTR_SCAN_COMMON_FN scan_fn;
     13 /*	VSTREAM *stream;
     14 /*	int	flags;
     15 /*	void	*ptr;
     16 /* DESCRIPTION
     17 /*	msg_stats_scan() reads an MSG_STATS from the named stream
     18 /*	using the specified attribute scan routine. msg_stats_scan()
     19 /*	is meant to be passed as a call-back to attr_scan(), thusly:
     20 /*
     21 /*	... RECV_ATTR_FUNC(msg_stats_scan, (void *) &stats), ...
     22 /* DIAGNOSTICS
     23 /*	Fatal: out of memory.
     24 /* LICENSE
     25 /* .ad
     26 /* .fi
     27 /*	The Secure Mailer license must be distributed with this software.
     28 /* AUTHOR(S)
     29 /*	Wietse Venema
     30 /*	IBM T.J. Watson Research
     31 /*	P.O. Box 704
     32 /*	Yorktown Heights, NY 10598, USA
     33 /*
     34 /*	Wietse Venema
     35 /*	Google, Inc.
     36 /*	111 8th Avenue
     37 /*	New York, NY 10011, USA
     38 /*--*/
     39 
     40 /* System library. */
     41 
     42 #include <sys_defs.h>
     43 
     44 /* Utility library. */
     45 
     46 #include <attr.h>
     47 #include <vstring.h>
     48 #include <msg.h>
     49 
     50 /* Global library. */
     51 
     52 #include <mail_proto.h>
     53 #include <msg_stats.h>
     54 
     55  /*
     56   * SLMs.
     57   */
     58 #define STR(x) vstring_str(x)
     59 #define LEN(x) VSTRING_LEN(x)
     60 
     61 /* msg_stats_scan - read MSG_STATS from stream */
     62 
     63 int     msg_stats_scan(ATTR_SCAN_COMMON_FN scan_fn, VSTREAM *fp,
     64 		               int flags, void *ptr)
     65 {
     66     MSG_STATS *stats = (MSG_STATS *) ptr;
     67     VSTRING *buf = vstring_alloc(sizeof(MSG_STATS) * 2);
     68     int     ret;
     69 
     70     /*
     71      * Receive the entire structure. This is not only simpler but also likely
     72      * to be quicker than having the sender figure out what fields need to be
     73      * sent, converting those numbers to string and back, and having the
     74      * receiver initialize the unused fields by hand.
     75      *
     76      * XXX Would be nice if VSTRINGs could import a fixed-size buffer and
     77      * gracefully reject attempts to extend it.
     78      */
     79     ret = scan_fn(fp, flags | ATTR_FLAG_MORE,
     80 		  RECV_ATTR_DATA(MAIL_ATTR_TIME, buf),
     81 		  ATTR_TYPE_END);
     82     if (ret == 1) {
     83 	if (LEN(buf) == sizeof(*stats)) {
     84 	    memcpy((void *) stats, STR(buf), sizeof(*stats));
     85 	} else {
     86 	    msg_warn("msg_stats_scan: size mis-match: %u != %u",
     87 		     (unsigned) LEN(buf), (unsigned) sizeof(*stats));
     88 	    ret = (-1);
     89 	}
     90     }
     91     vstring_free(buf);
     92     return (ret);
     93 }
     94