update.c revision 44743 
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
16#ifndef lint
17static char sccsid[] = "@(#) update.c 1.1 94/12/28 17:42:56";
18#endif
19
20/* System libraries */
21
22#include <stdio.h>
23#include <syslog.h>
24#include <string.h>
25
26/* Local stuff. */
27
28#include "mystdarg.h"
29#include "tcpd.h"
30
31/* request_fill - request update engine */
32
33static struct request_info *request_fill(request, ap)
34struct request_info *request;
35va_list ap;
36{
37    int     key;
38    char   *ptr;
39
40    while ((key = va_arg(ap, int)) > 0) {
41	switch (key) {
42	default:
43	    tcpd_warn("request_fill: invalid key: %d", key);
44	    return (request);
45	case RQ_FILE:
46	    request->fd = va_arg(ap, int);
47	    continue;
48	case RQ_CLIENT_SIN:
49	    request->client->sin = va_arg(ap, struct sockaddr_in *);
50	    continue;
51	case RQ_SERVER_SIN:
52	    request->server->sin = va_arg(ap, struct sockaddr_in *);
53	    continue;
54
55	    /*
56	     * All other fields are strings with the same maximal length.
57	     */
58
59	case RQ_DAEMON:
60	    ptr = request->daemon;
61	    break;
62	case RQ_USER:
63	    ptr = request->user;
64	    break;
65	case RQ_CLIENT_NAME:
66	    ptr = request->client->name;
67	    break;
68	case RQ_CLIENT_ADDR:
69	    ptr = request->client->addr;
70	    break;
71	case RQ_SERVER_NAME:
72	    ptr = request->server->name;
73	    break;
74	case RQ_SERVER_ADDR:
75	    ptr = request->server->addr;
76	    break;
77	}
78	STRN_CPY(ptr, va_arg(ap, char *), STRING_LENGTH);
79    }
80    return (request);
81}
82
83/* request_init - initialize request structure */
84
85struct request_info *VARARGS(request_init, struct request_info *, request)
86{
87    static struct request_info default_info;
88    struct request_info *r;
89    va_list ap;
90
91    /*
92     * Initialize data members. We do not assign default function pointer
93     * members, to avoid pulling in the whole socket module when it is not
94     * really needed.
95     */
96    VASTART(ap, struct request_info *, request);
97    *request = default_info;
98    request->fd = -1;
99    strcpy(request->daemon, unknown);
100    sprintf(request->pid, "%d", getpid());
101    request->client->request = request;
102    request->server->request = request;
103    r = request_fill(request, ap);
104    VAEND(ap);
105    return (r);
106}
107
108/* request_set - update request structure */
109
110struct request_info *VARARGS(request_set, struct request_info *, request)
111{
112    struct request_info *r;
113    va_list ap;
114
115    VASTART(ap, struct request_info *, request);
116    r = request_fill(request, ap);
117    VAEND(ap);
118    return (r);
119}
120