lib/libwrap/update.c

   1 /*      $NetBSD: update.c,v 1.9 2012/03/21 10:10:37 matt Exp $  */
   2
   3  /*
   4   * Routines for controlled update/initialization of request structures.
   5   *
   6   * request_init() initializes its argument. Pointers and string-valued members
   7   * are initialized to zero, to indicate that no lookup has been attempted.
   8   *
   9   * request_set() adds information to an already initialized request structure.
  10   *
  11   * Both functions take a variable-length name-value list.
  12   *
  13   * Diagnostics are reported through syslog(3).
  14   *
  15   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  16   */
  17
  18 #include <sys/cdefs.h>
  19 #ifndef lint
  20 #if 0
  21 static char sccsid[] = "@(#) update.c 1.1 94/12/28 17:42:56";
  22 #else
  23 __RCSID("$NetBSD: update.c,v 1.9 2012/03/21 10:10:37 matt Exp $");
  24 #endif
  25 #endif
  26
  27 /* System libraries */
  28
  29 #include <stdio.h>
  30 #include <syslog.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 /* Local stuff. */
  35
  36 #include "mystdarg.h"
  37 #include "tcpd.h"
  38
  39 static struct request_info *request_fill(struct request_info *, va_list);
  40
  41 /* request_fill - request update engine */
  42
  43 static struct request_info *
  44 request_fill(struct request_info *request, va_list ap)
  45 {
  46     int     key;
  47     char   *ptr;
  48
  49     while ((key = va_arg(ap, int)) > 0) {
  50         switch (key) {
  51         default:
  52             tcpd_warn("request_fill: invalid key: %d", key);
  53             return (request);
  54         case RQ_FILE:
  55             request->fd = va_arg(ap, int);
  56             continue;
  57         case RQ_CLIENT_SIN:
  58             request->client->sin = va_arg(ap, struct sockaddr *);
  59             continue;
  60         case RQ_SERVER_SIN:
  61             request->server->sin = va_arg(ap, struct sockaddr *);
  62             continue;
  63
  64             /*
  65              * All other fields are strings with the same maximal length.
  66              */
  67
  68         case RQ_DAEMON:
  69             ptr = request->daemon;
  70             break;
  71         case RQ_USER:
  72             ptr = request->user;
  73             break;
  74         case RQ_CLIENT_NAME:
  75             ptr = request->client->name;
  76             break;
  77         case RQ_CLIENT_ADDR:
  78             ptr = request->client->addr;
  79             break;
  80         case RQ_SERVER_NAME:
  81             ptr = request->server->name;
  82             break;
  83         case RQ_SERVER_ADDR:
  84             ptr = request->server->addr;
  85             break;
  86         }
  87         strlcpy(ptr, va_arg(ap, char *), STRING_LENGTH);
  88     }
  89     return (request);
  90 }
  91
  92 /* request_init - initialize request structure */
  93
  94 struct request_info *VARARGS(request_init, struct request_info *, request)
  95 {
  96     static struct request_info default_info;
  97     struct request_info *r;
  98     va_list ap;
  99
 100     /*
 101      * Initialize data members. We do not assign default function pointer
 102      * members, to avoid pulling in the whole socket module when it is not
 103      * really needed.
 104      */
 105     VASTART(ap, struct request_info *, request);
 106     *request = default_info;
 107     request->fd = -1;
 108     (void)strlcpy(request->daemon, unknown, sizeof(request->daemon));
 109     (void)snprintf(request->pid, sizeof(request->pid), "%d", getpid());
 110     request->client->request = request;
 111     request->server->request = request;
 112     r = request_fill(request, ap);
 113     VAEND(ap);
 114     return (r);
 115 }
 116
 117 /* request_set - update request structure */
 118
 119 struct request_info *VARARGS(request_set, struct request_info *, request)
 120 {
 121     struct request_info *r;
 122     va_list ap;
 123
 124     VASTART(ap, struct request_info *, request);
 125     r = request_fill(request, ap);
 126     VAEND(ap);
 127     return (r);
 128 }