contrib/bind-9.2.4rc7/lib/bind/irs/getprotoent.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996,1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if !defined(LINT) && !defined(CODECENTER)
  19 static const char rcsid[] = "$Id: getprotoent.c,v 1.2.2.1 2004/03/09 09:17:30 marka Exp $";
  20 #endif
  21
  22 /* Imports */
  23
  24 #include "port_before.h"
  25
  26 #if !defined(__BIND_NOSTATIC)
  27
  28 #include <sys/types.h>
  29
  30 #include <netinet/in.h>
  31 #include <arpa/nameser.h>
  32
  33 #include <errno.h>
  34 #include <resolv.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #include <irs.h>
  39
  40 #include "port_after.h"
  41
  42 #include "irs_data.h"
  43
  44 /* Forward */
  45
  46 static struct net_data *init(void);
  47
  48 /* Public */
  49
  50 struct protoent *
  51 getprotoent() {
  52         struct net_data *net_data = init();
  53
  54         return (getprotoent_p(net_data));
  55 }
  56
  57 struct protoent *
  58 getprotobyname(const char *name) {
  59         struct net_data *net_data = init();
  60
  61         return (getprotobyname_p(name, net_data));
  62 }
  63
  64 struct protoent *
  65 getprotobynumber(int proto) {
  66         struct net_data *net_data = init();
  67
  68         return (getprotobynumber_p(proto, net_data));
  69 }
  70
  71 void
  72 setprotoent(int stayopen) {
  73         struct net_data *net_data = init();
  74
  75         setprotoent_p(stayopen, net_data);
  76 }
  77
  78 void
  79 endprotoent() {
  80         struct net_data *net_data = init();
  81
  82         endprotoent_p(net_data);
  83 }
  84
  85 /* Shared private. */
  86
  87 struct protoent *
  88 getprotoent_p(struct net_data *net_data) {
  89         struct irs_pr *pr;
  90
  91         if (!net_data || !(pr = net_data->pr))
  92                 return (NULL);
  93         net_data->pr_last = (*pr->next)(pr);
  94         return (net_data->pr_last);
  95 }
  96
  97 struct protoent *
  98 getprotobyname_p(const char *name, struct net_data *net_data) {
  99         struct irs_pr *pr;
 100         char **pap;
 101
 102         if (!net_data || !(pr = net_data->pr))
 103                 return (NULL);
 104         if (net_data->pr_stayopen && net_data->pr_last) {
 105                 if (!strcmp(net_data->pr_last->p_name, name))
 106                         return (net_data->pr_last);
 107                 for (pap = net_data->pr_last->p_aliases; pap && *pap; pap++)
 108                         if (!strcmp(name, *pap))
 109                                 return (net_data->pr_last);
 110         }
 111         net_data->pr_last = (*pr->byname)(pr, name);
 112         if (!net_data->pr_stayopen)
 113                 endprotoent();
 114         return (net_data->pr_last);
 115 }
 116
 117 struct protoent *
 118 getprotobynumber_p(int proto, struct net_data *net_data) {
 119         struct irs_pr *pr;
 120
 121         if (!net_data || !(pr = net_data->pr))
 122                 return (NULL);
 123         if (net_data->pr_stayopen && net_data->pr_last)
 124                 if (net_data->pr_last->p_proto == proto)
 125                         return (net_data->pr_last);
 126         net_data->pr_last = (*pr->bynumber)(pr, proto);
 127         if (!net_data->pr_stayopen)
 128                 endprotoent();
 129         return (net_data->pr_last);
 130 }
 131
 132 void
 133 setprotoent_p(int stayopen, struct net_data *net_data) {
 134         struct irs_pr *pr;
 135
 136         if (!net_data || !(pr = net_data->pr))
 137                 return;
 138         (*pr->rewind)(pr);
 139         net_data->pr_stayopen = (stayopen != 0);
 140         if (stayopen == 0)
 141                 net_data_minimize(net_data);
 142 }
 143
 144 void
 145 endprotoent_p(struct net_data *net_data) {
 146         struct irs_pr *pr;
 147
 148         if ((net_data != NULL) && ((pr = net_data->pr) != NULL))
 149                 (*pr->minimize)(pr);
 150 }
 151
 152 /* Private */
 153
 154 static struct net_data *
 155 init() {
 156         struct net_data *net_data;
 157
 158         if (!(net_data = net_data_init(NULL)))
 159                 goto error;
 160         if (!net_data->pr) {
 161                 net_data->pr = (*net_data->irs->pr_map)(net_data->irs);
 162
 163                 if (!net_data->pr || !net_data->res) {
 164  error:
 165                         errno = EIO;
 166                         return (NULL);
 167                 }
 168                 (*net_data->pr->res_set)(net_data->pr, net_data->res, NULL);
 169         }
 170
 171         return (net_data);
 172 }
 173
 174 #endif /*__BIND_NOSTATIC*/