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
recv_pass_attr(int fd,HTABLE ** attr,int timeout,ssize_t bufsize)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