external/bsd/dhcp/dist/dhcpctl/callback.c

   1 /*      $NetBSD: callback.c,v 1.1.1.2 2014/07/12 11:57:51 spz Exp $     */
   2 /* callback.c
   3
   4    The dhcpctl callback object. */
   5
   6 /*
   7  * Copyright (c) 2004,2007,2009,2014 by Internet Systems Consortium, Inc. ("ISC")
   8  * Copyright (c) 1999-2003 by Internet Software Consortium
   9  *
  10  * Permission to use, copy, modify, and distribute this software for any
  11  * purpose with or without fee is hereby granted, provided that the above
  12  * copyright notice and this permission notice appear in all copies.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  20  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  *   Internet Systems Consortium, Inc.
  23  *   950 Charter Street
  24  *   Redwood City, CA 94063
  25  *   <info@isc.org>
  26  *   https://www.isc.org/
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __RCSID("$NetBSD: callback.c,v 1.1.1.2 2014/07/12 11:57:51 spz Exp $");
  32
  33 #include "dhcpd.h"
  34 #include <omapip/omapip_p.h>
  35 #include "dhcpctl.h"
  36
  37 /* dhcpctl_set_callback
  38
  39    synchronous, with asynchronous aftereffect
  40    handle is some object upon which some kind of process has been
  41    started - e.g., an open, an update or a refresh.
  42    data is an anonymous pointer containing some information that
  43    the callback will use to figure out what event completed.
  44    return value of 0 means callback was successfully set, a nonzero
  45    status code is returned otherwise.
  46    Upon completion of whatever task is in process, the callback
  47    will be passed the handle to the object, a status code
  48    indicating what happened, and the anonymous pointer passed to  */
  49
  50 dhcpctl_status dhcpctl_set_callback (dhcpctl_handle h, void *data,
  51                                      void (*func) (dhcpctl_handle,
  52                                                    dhcpctl_status, void *))
  53 {
  54         dhcpctl_callback_object_t *callback;
  55         omapi_object_t *inner;
  56
  57         callback = dmalloc (sizeof *callback, MDL);
  58         if (!callback)
  59                 return ISC_R_NOMEMORY;
  60
  61         /* Tie the callback object to the innermost object in the chain. */
  62         for (inner = h; inner -> inner; inner = inner -> inner)
  63                 ;
  64         omapi_object_reference (&inner -> inner,
  65                                 (omapi_object_t *)callback, MDL);
  66         omapi_object_reference ((omapi_object_t **)&callback -> outer,
  67                                 inner, MDL);
  68
  69         /* Save the actual handle pointer we were passed for the callback. */
  70         omapi_object_reference (&callback -> object, h, MDL);
  71         callback -> data = data;
  72         callback -> callback = func;
  73
  74         return ISC_R_SUCCESS;
  75 }
  76
  77 /* Callback methods (not meant to be called directly) */
  78
  79 isc_result_t dhcpctl_callback_set_value (omapi_object_t *h,
  80                                          omapi_object_t *id,
  81                                          omapi_data_string_t *name,
  82                                          omapi_typed_data_t *value)
  83 {
  84         if (h -> type != dhcpctl_callback_type)
  85                 return DHCP_R_INVALIDARG;
  86
  87         if (h -> inner && h -> inner -> type -> set_value)
  88                 return (*(h -> inner -> type -> set_value))
  89                         (h -> inner, id, name, value);
  90         return ISC_R_NOTFOUND;
  91 }
  92
  93 isc_result_t dhcpctl_callback_get_value (omapi_object_t *h,
  94                                          omapi_object_t *id,
  95                                          omapi_data_string_t *name,
  96                                          omapi_value_t **value)
  97 {
  98         if (h -> type != dhcpctl_callback_type)
  99                 return DHCP_R_INVALIDARG;
 100
 101         if (h -> inner && h -> inner -> type -> get_value)
 102                 return (*(h -> inner -> type -> get_value))
 103                         (h -> inner, id, name, value);
 104         return ISC_R_NOTFOUND;
 105 }
 106
 107 isc_result_t dhcpctl_callback_signal_handler (omapi_object_t *o,
 108                                               const char *name, va_list ap)
 109 {
 110         dhcpctl_callback_object_t *p;
 111         isc_result_t waitstatus;
 112
 113         if (o -> type != dhcpctl_callback_type)
 114                 return DHCP_R_INVALIDARG;
 115         p = (dhcpctl_callback_object_t *)o;
 116
 117         /* Not a signal we recognize? */
 118         if (strcmp (name, "ready")) {
 119                 if (p -> inner && p -> inner -> type -> signal_handler)
 120                         return (*(p -> inner -> type -> signal_handler))
 121                                 (p -> inner, name, ap);
 122                 return ISC_R_NOTFOUND;
 123         }
 124
 125         if (p -> object -> type == dhcpctl_remote_type) {
 126                 waitstatus = (((dhcpctl_remote_object_t *)
 127                                (p -> object)) -> waitstatus);
 128         } else
 129                 waitstatus = ISC_R_SUCCESS;
 130
 131         /* Do the callback. */
 132         if (p -> callback)
 133                 (*(p -> callback)) (p -> object, waitstatus, p -> data);
 134
 135         return ISC_R_SUCCESS;
 136 }
 137
 138 isc_result_t dhcpctl_callback_destroy (omapi_object_t *h,
 139                                        const char *file, int line)
 140 {
 141         dhcpctl_callback_object_t *p;
 142         if (h -> type != dhcpctl_callback_type)
 143                 return DHCP_R_INVALIDARG;
 144         p = (dhcpctl_callback_object_t *)h;
 145         if (p -> handle)
 146                 omapi_object_dereference ((omapi_object_t **)&p -> handle,
 147                                           file, line);
 148         return ISC_R_SUCCESS;
 149 }
 150
 151 /* Write all the published values associated with the object through the
 152    specified connection. */
 153
 154 isc_result_t dhcpctl_callback_stuff_values (omapi_object_t *c,
 155                                             omapi_object_t *id,
 156                                             omapi_object_t *p)
 157 {
 158         if (p -> type != dhcpctl_callback_type)
 159                 return DHCP_R_INVALIDARG;
 160
 161         if (p -> inner && p -> inner -> type -> stuff_values)
 162                 return (*(p -> inner -> type -> stuff_values)) (c, id,
 163                                                                 p -> inner);
 164         return ISC_R_SUCCESS;
 165 }
 166