usr/src/lib/libsocket/inet/getservbyname_r.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  *      Copyright (c) 1991-1994  Sun Microsystems, Inc
  24  *
  25  * lib/libsocket/inet/getservbyname_r.c
  26  *
  27  * getservbyname_r() is defined in this file. It is implemented on top of
  28  *   _get_hostserv_inetnetdir_byname() which is also used to implement
  29  *   netdir_getbyname() for inet family transports.  In turn the common code
  30  *   uses the name service switch policy for "hosts" and "services" unless
  31  *   the administrator chooses to bypass the name service switch by
  32  *   specifying third-party supplied nametoaddr libs for inet transports
  33  *   in /etc/netconfig.
  34  *
  35  * getservbyport_r() is similarly related to _get_hostserv_inetnetdir_byaddr()
  36  *   and netdir_getbyaddr();
  37  *
  38  * The common code lives in lib/libnsl/nss/netdir_inet.c.
  39  *
  40  * getservent_r(), setservent() and endservent() are *not* implemented on top
  41  *   of the common interface;  they go straight to the switch and are
  42  *   defined in getservent_r.c.
  43  *
  44  * There is absolutely no data sharing, not even the stayopen flag or
  45  *   enumeration state, between getservbyYY_r() and getservent_r();
  46  */
  47
  48 #pragma ident   "%Z%%M% %I%     %E% SMI"
  49
  50 #include <netdb.h>
  51 #include <netdir.h>
  52 #include <sys/types.h>
  53 #include <nss_netdir.h>
  54
  55 extern int str2servent(const char *, int, void *, char *, int);
  56 extern struct netconfig *__rpc_getconfip();
  57
  58 struct servent *
  59 getservbyname_r(const char *name, const char *proto, struct servent *result,
  60         char *buffer, int buflen)
  61 {
  62         struct netconfig *nconf;
  63         struct  nss_netdirbyname_in nssin;
  64         union   nss_netdirbyname_out nssout;
  65         int neterr;
  66
  67         if ((nconf = __rpc_getconfip("udp")) == NULL &&
  68             (nconf = __rpc_getconfip("tcp")) == NULL) {
  69                 return ((struct servent *)NULL);
  70         }
  71         nssin.op_t = NSS_SERV;
  72         nssin.arg.nss.serv.name = name;
  73         nssin.arg.nss.serv.proto = proto;
  74         nssin.arg.nss.serv.buf = buffer;
  75         nssin.arg.nss.serv.buflen = buflen;
  76
  77         nssout.nss.serv = result;
  78
  79         /*
  80          * We pass in nconf and let the implementation of the long-named func
  81          * decide whether to use the switch based on nc_nlookups.
  82          */
  83         neterr = _get_hostserv_inetnetdir_byname(nconf, &nssin, &nssout);
  84
  85         (void) freenetconfigent(nconf);
  86         if (neterr != ND_OK) {
  87                 return ((struct servent *)NULL);
  88         }
  89         return (nssout.nss.serv);
  90 }
  91
  92 struct servent *
  93 getservbyport_r(int port, const char *proto, struct servent *result,
  94         char *buffer, int buflen)
  95 {
  96         struct netconfig *nconf;
  97         struct  nss_netdirbyaddr_in nssin;
  98         union   nss_netdirbyaddr_out nssout;
  99         int neterr;
 100
 101         if ((nconf = __rpc_getconfip("udp")) == NULL &&
 102             (nconf = __rpc_getconfip("tcp")) == NULL) {
 103                 return ((struct servent *)NULL);
 104         }
 105         nssin.op_t = NSS_SERV;
 106         nssin.arg.nss.serv.port = port;
 107         nssin.arg.nss.serv.proto = proto;
 108         nssin.arg.nss.serv.buf = buffer;
 109         nssin.arg.nss.serv.buflen = buflen;
 110
 111         nssout.nss.serv = result;
 112
 113         /*
 114          * We pass in nconf and let the implementation of this long-named func
 115          * decide whether to use the switch based on nc_nlookups.
 116          */
 117         neterr = _get_hostserv_inetnetdir_byaddr(nconf, &nssin, &nssout);
 118
 119         (void) freenetconfigent(nconf);
 120         if (neterr != ND_OK) {
 121                 return ((struct servent *)NULL);
 122         }
 123         return (nssout.nss.serv);
 124 }