Home | History | Annotate | Line # | Download | only in util 
      1 /*	$NetBSD: recv_pass_attr.c,v 1.3 2020/03/18 19:05:22 christos Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	recv_pass_attr 3
      6 /* SUMMARY
      7 /*	predicate if string is all numerical
      8 /* SYNOPSIS
      9 /*	#include <listen.h>
     10 /*
     11 /*	int	recv_pass_attr(fd, attr, timeout, bufsize)
     12 /*	int	fd;
     13 /*	HTABLE	**attr;
     14 /*	int	timeout;
     15 /*	ssize_t	bufsize;
     16 /* DESCRIPTION
     17 /*	recv_pass_attr() receives named attributes over the specified
     18 /*	descriptor. The result value is zero for success, -1 for error.
     19 /*
     20 /*	Arguments:
     21 /* .IP fd
     22 /*	The file descriptor to read from.
     23 /* .IP attr
     24 /*	Pointer to attribute list pointer. The target is set to
     25 /*	zero on error or when the received attribute list is empty,
     26 /*	otherwise it is assigned a pointer to non-empty attribute
     27 /*	list.
     28 /* .IP timeout
     29 /*	The deadline for receiving all attributes.
     30 /* .IP bufsize
     31 /*	The read buffer size. Specify 1 to avoid reading past the
     32 /*	end of the attribute list.
     33 /* LICENSE
     34 /* .ad
     35 /* .fi
     36 /*	The Secure Mailer license must be distributed with this software.
     37 /* AUTHOR(S)
     38 /*	Wietse Venema
     39 /*	IBM T.J. Watson Research
     40 /*	P.O. Box 704
     41 /*	Yorktown Heights, NY 10598, USA
     42 /*
     43 /*	Wietse Venema
     44 /*	Google, Inc.
     45 /*	111 8th Avenue
     46 /*	New York, NY 10011, USA
     47 /*--*/
     48 
     49 /* System library. */
     50 
     51 #include <sys_defs.h>
     52 
     53 /* Utility library. */
     54 
     55 #include <iostuff.h>
     56 #include <htable.h>
     57 #include <vstream.h>
     58 #include <attr.h>
     59 #include <mymalloc.h>
     60 #include <listen.h>
     61 
     62 /* recv_pass_attr - receive connection attributes */
     63 
     64 int     recv_pass_attr(int fd, HTABLE **attr, int timeout, ssize_t bufsize)
     65 {
     66     VSTREAM *fp;
     67     int     stream_err;
     68 
     69     /*
     70      * Set up a temporary VSTREAM to receive the attributes.
     71      *
     72      * XXX We use one-character reads to simplify the implementation.
     73      */
     74     fp = vstream_fdopen(fd, O_RDWR);
     75     vstream_control(fp,
     76 		    CA_VSTREAM_CTL_BUFSIZE(bufsize),
     77 		    CA_VSTREAM_CTL_TIMEOUT(timeout),
     78 		    CA_VSTREAM_CTL_START_DEADLINE,
     79 		    CA_VSTREAM_CTL_END);
     80     stream_err = (attr_scan(fp, ATTR_FLAG_NONE,
     81 			    ATTR_TYPE_HASH, *attr = htable_create(1),
     82 			    ATTR_TYPE_END) < 0
     83 		  || vstream_feof(fp) || vstream_ferror(fp));
     84     vstream_fdclose(fp);
     85 
     86     /*
     87      * Error reporting and recovery.
     88      */
     89     if (stream_err) {
     90 	htable_free(*attr, myfree);
     91 	*attr = 0;
     92 	return (-1);
     93     } else {
     94 	if ((*attr)->used == 0) {
     95 	    htable_free(*attr, myfree);
     96 	    *attr = 0;
     97 	}
     98 	return (0);
     99     }
    100 }
    101