usr/src/lib/libwrap/update.c

   1 /*
   2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6  /*
   7   * Routines for controlled update/initialization of request structures.
   8   *
   9   * request_init() initializes its argument. Pointers and string-valued members
  10   * are initialized to zero, to indicate that no lookup has been attempted.
  11   *
  12   * request_set() adds information to an already initialized request structure.
  13   *
  14   * Both functions take a variable-length name-value list.
  15   *
  16   * Diagnostics are reported through syslog(3).
  17   *
  18   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  19   */
  20
  21 #ifndef lint
  22 static char sccsid[] = "@(#) update.c 1.1 94/12/28 17:42:56";
  23 #endif
  24
  25 /* System libraries */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <syslog.h>
  31 #include <string.h>
  32
  33 /* Local stuff. */
  34
  35 #include "mystdarg.h"
  36 #include "tcpd.h"
  37
  38 /* request_fill - request update engine */
  39
  40 static struct request_info *request_fill(request, ap)
  41 struct request_info *request;
  42 va_list ap;
  43 {
  44     int     key;
  45     char   *ptr;
  46
  47     while ((key = va_arg(ap, int)) > 0) {
  48         switch (key) {
  49         default:
  50             tcpd_warn("request_fill: invalid key: %d", key);
  51             return (request);
  52         case RQ_FILE:
  53             request->fd = va_arg(ap, int);
  54             continue;
  55         case RQ_CLIENT_SIN:
  56             request->client->sin = va_arg(ap, struct sockaddr_gen *);
  57             continue;
  58         case RQ_SERVER_SIN:
  59             request->server->sin = va_arg(ap, struct sockaddr_gen *);
  60             continue;
  61
  62             /*
  63              * All other fields are strings with the same maximal length.
  64              */
  65
  66         case RQ_DAEMON:
  67             ptr = request->daemon;
  68             break;
  69         case RQ_USER:
  70             ptr = request->user;
  71             break;
  72         case RQ_CLIENT_NAME:
  73             ptr = request->client->name;
  74             break;
  75         case RQ_CLIENT_ADDR:
  76             ptr = request->client->addr;
  77             break;
  78         case RQ_SERVER_NAME:
  79             ptr = request->server->name;
  80             break;
  81         case RQ_SERVER_ADDR:
  82             ptr = request->server->addr;
  83             break;
  84         }
  85         STRN_CPY(ptr, va_arg(ap, char *), STRING_LENGTH);
  86     }
  87     return (request);
  88 }
  89
  90 /* request_init - initialize request structure */
  91
  92 struct request_info *VARARGS(request_init, struct request_info *, request)
  93 {
  94     static struct request_info default_info;
  95     struct request_info *r;
  96     va_list ap;
  97
  98     /*
  99      * Initialize data members. We do not assign default function pointer
 100      * members, to avoid pulling in the whole socket module when it is not
 101      * really needed.
 102      */
 103     VASTART(ap, struct request_info *, request);
 104     *request = default_info;
 105     request->fd = -1;
 106     strcpy(request->daemon, unknown);
 107     sprintf(request->pid, "%d", getpid());
 108     request->client->request = request;
 109     request->server->request = request;
 110     r = request_fill(request, ap);
 111     VAEND(ap);
 112     return (r);
 113 }
 114
 115 /* request_set - update request structure */
 116
 117 struct request_info *VARARGS(request_set, struct request_info *, request)
 118 {
 119     struct request_info *r;
 120     va_list ap;
 121
 122     VASTART(ap, struct request_info *, request);
 123     r = request_fill(request, ap);
 124     VAEND(ap);
 125     return (r);
 126 }