update.c revision 257398 
1 /*
2  * Routines for controlled update/initialization of request structures.
3  *
4  * request_init() initializes its argument. Pointers and string-valued members
5  * are initialized to zero, to indicate that no lookup has been attempted.
6  *
7  * request_set() adds information to an already initialized request structure.
8  *
9  * Both functions take a variable-length name-value list.
10  *
11  * Diagnostics are reported through syslog(3).
12  *
13  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
14  *
15  * $FreeBSD: head/contrib/tcp_wrappers/update.c 257398 2013-10-30 21:18:14Z sbruno $
16  */
17
18#ifndef lint
19static char sccsid[] = "@(#) update.c 1.1 94/12/28 17:42:56";
20#endif
21
22/* System libraries */
23
24#include <stdio.h>
25#include <syslog.h>
26#include <string.h>
27#include <unistd.h>
28
29/* Local stuff. */
30
31#include "mystdarg.h"
32#include "tcpd.h"
33
34/* request_fill - request update engine */
35
36static struct request_info *request_fill(request, ap)
37struct request_info *request;
38va_list ap;
39{
40    int     key;
41    char   *ptr;
42
43    while ((key = va_arg(ap, int)) > 0) {
44	switch (key) {
45	default:
46	    tcpd_warn("request_fill: invalid key: %d", key);
47	    return (request);
48	case RQ_FILE:
49	    request->fd = va_arg(ap, int);
50	    continue;
51	case RQ_CLIENT_SIN:
52#ifdef INET6
53	    request->client->sin = va_arg(ap, struct sockaddr *);
54#else
55	    request->client->sin = va_arg(ap, struct sockaddr_in *);
56#endif
57	    continue;
58	case RQ_SERVER_SIN:
59#ifdef INET6
60	    request->server->sin = va_arg(ap, struct sockaddr *);
61#else
62	    request->server->sin = va_arg(ap, struct sockaddr_in *);
63#endif
64	    continue;
65
66	    /*
67	     * All other fields are strings with the same maximal length.
68	     */
69
70	case RQ_DAEMON:
71	    ptr = request->daemon;
72	    break;
73	case RQ_USER:
74	    ptr = request->user;
75	    break;
76	case RQ_CLIENT_NAME:
77	    ptr = request->client->name;
78	    break;
79	case RQ_CLIENT_ADDR:
80	    ptr = request->client->addr;
81	    break;
82	case RQ_SERVER_NAME:
83	    ptr = request->server->name;
84	    break;
85	case RQ_SERVER_ADDR:
86	    ptr = request->server->addr;
87	    break;
88	}
89	STRN_CPY(ptr, va_arg(ap, char *), STRING_LENGTH);
90    }
91    return (request);
92}
93
94/* request_init - initialize request structure */
95
96struct request_info *VARARGS(request_init, struct request_info *, request)
97{
98    static struct request_info default_info;
99    struct request_info *r;
100    va_list ap;
101
102    /*
103     * Initialize data members. We do not assign default function pointer
104     * members, to avoid pulling in the whole socket module when it is not
105     * really needed.
106     */
107    VASTART(ap, struct request_info *, request);
108    *request = default_info;
109    request->fd = -1;
110    strcpy(request->daemon, unknown);
111    sprintf(request->pid, "%d", getpid());
112    request->client->request = request;
113    request->server->request = request;
114    r = request_fill(request, ap);
115    VAEND(ap);
116    return (r);
117}
118
119/* request_set - update request structure */
120
121struct request_info *VARARGS(request_set, struct request_info *, request)
122{
123    struct request_info *r;
124    va_list ap;
125
126    VASTART(ap, struct request_info *, request);
127    r = request_fill(request, ap);
128    VAEND(ap);
129    return (r);
130}
131