lib/libc/rpc/svc_generic.c

   1 /*      $NetBSD: svc_generic.c,v 1.17 2014/05/29 12:35:45 christos Exp $        */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  36  */
  37
  38 /* #ident       "@(#)svc_generic.c      1.19    94/04/24 SMI" */
  39
  40 #include <sys/cdefs.h>
  41 #if defined(LIBC_SCCS) && !defined(lint)
  42 #if 0
  43 static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
  44 #else
  45 __RCSID("$NetBSD: svc_generic.c,v 1.17 2014/05/29 12:35:45 christos Exp $");
  46 #endif
  47 #endif
  48
  49 /*
  50  * svc_generic.c, Server side for RPC.
  51  *
  52  */
  53
  54 #include "namespace.h"
  55 #include "reentrant.h"
  56 #include <sys/types.h>
  57 #include <sys/socket.h>
  58 #include <netinet/in.h>
  59 #include <rpc/rpc.h>
  60 #include <rpc/nettype.h>
  61 #include <stdio.h>
  62 #include <errno.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #include <err.h>
  67
  68 #include "svc_fdset.h"
  69 #include "rpc_internal.h"
  70
  71 #ifdef __weak_alias
  72 __weak_alias(svc_create,_svc_create)
  73 __weak_alias(svc_tp_create,_svc_tp_create)
  74 __weak_alias(svc_tli_create,_svc_tli_create)
  75 #endif
  76
  77 extern int __svc_vc_setflag(SVCXPRT *, int);
  78
  79 /*
  80  * The highest level interface for server creation.
  81  * It tries for all the nettokens in that particular class of token
  82  * and returns the number of handles it can create and/or find.
  83  *
  84  * It creates a link list of all the handles it could create.
  85  * If svc_create() is called multiple times, it uses the handle
  86  * created earlier instead of creating a new handle every time.
  87  */
  88 int
  89 svc_create(
  90         void (*dispatch)(struct svc_req *, SVCXPRT *),
  91         rpcprog_t prognum,              /* Program number */
  92         rpcvers_t versnum,              /* Version number */
  93         const char *nettype)            /* Networktype token */
  94 {
  95         struct xlist {
  96                 SVCXPRT *xprt;          /* Server handle */
  97                 struct xlist *next;     /* Next item */
  98         } *l;
  99         static struct xlist *xprtlist;  /* A link list of all the handles */
 100         int num = 0;
 101         SVCXPRT *xprt;
 102         struct netconfig *nconf;
 103         void *handle;
 104 #ifdef _REENTRANT
 105         extern mutex_t xprtlist_lock;
 106 #endif
 107
 108 /* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
 109
 110         if ((handle = __rpc_setconf(nettype)) == NULL) {
 111                 warnx("%s: unknown protocol %s", __func__, nettype);
 112                 return (0);
 113         }
 114         while ((nconf = __rpc_getconf(handle)) != NULL) {
 115                 mutex_lock(&xprtlist_lock);
 116                 for (l = xprtlist; l; l = l->next) {
 117                         if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
 118                                 /* Found an old one, use it */
 119                                 (void) rpcb_unset(prognum, versnum, nconf);
 120                                 if (svc_reg(l->xprt, prognum, versnum,
 121                                         dispatch, nconf) == FALSE)
 122                                         warnx("%s: could not register prog %u "
 123                                             "vers %u on %s", __func__,
 124                                             (unsigned)prognum,
 125                                             (unsigned)versnum, nconf->nc_netid);
 126                                 else
 127                                         num++;
 128                                 break;
 129                         }
 130                 }
 131                 if (l == NULL) {
 132                         /* It was not found. Now create a new one */
 133                         xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
 134                         if (xprt) {
 135                                 l = malloc(sizeof(*l));
 136                                 if (l == NULL) {
 137                                         warn("%s: out of memory", __func__);
 138                                         mutex_unlock(&xprtlist_lock);
 139                                         return (0);
 140                                 }
 141                                 l->xprt = xprt;
 142                                 l->next = xprtlist;
 143                                 xprtlist = l;
 144                                 num++;
 145                         }
 146                 }
 147                 mutex_unlock(&xprtlist_lock);
 148         }
 149         __rpc_endconf(handle);
 150         /*
 151          * In case of num == 0; the error messages are generated by the
 152          * underlying layers; and hence not needed here.
 153          */
 154         return (num);
 155 }
 156
 157 /*
 158  * The high level interface to svc_tli_create().
 159  * It tries to create a server for "nconf" and registers the service
 160  * with the rpcbind. It calls svc_tli_create();
 161  */
 162 SVCXPRT *
 163 svc_tp_create(
 164         void (*dispatch)(struct svc_req *, SVCXPRT *),
 165         rpcprog_t prognum,              /* Program number */
 166         rpcvers_t versnum,              /* Version number */
 167         const struct netconfig *nconf) /* Netconfig structure for the network */
 168 {
 169         SVCXPRT *xprt;
 170
 171         if (nconf == NULL) {
 172                 warnx("%s: invalid netconfig structure for prog %u vers %u",
 173                     __func__, (unsigned)prognum, (unsigned)versnum);
 174                 return (NULL);
 175         }
 176         xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
 177         if (xprt == NULL) {
 178                 return (NULL);
 179         }
 180         (void) rpcb_unset(prognum, versnum, __UNCONST(nconf));
 181         if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
 182                 warnx("%s: Could not register prog %u vers %u on %s",
 183                     __func__, (unsigned)prognum, (unsigned)versnum,
 184                     nconf->nc_netid);
 185                 SVC_DESTROY(xprt);
 186                 return (NULL);
 187         }
 188         return (xprt);
 189 }
 190
 191 /*
 192  * If fd is RPC_ANYFD, then it opens a fd for the given transport
 193  * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
 194  * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
 195  * NULL bindadr and Connection oriented transports, the value of qlen
 196  * is set to 8.
 197  *
 198  * If sendsz or recvsz are zero, their default values are chosen.
 199  */
 200 SVCXPRT *
 201 svc_tli_create(
 202         int fd,                         /* Connection end point */
 203         const struct netconfig *nconf,  /* Netconfig struct for nettoken */
 204         const struct t_bind *bindaddr,  /* Local bind address */
 205         u_int sendsz,                   /* Max sendsize */
 206         u_int recvsz)                   /* Max recvsize */
 207 {
 208         SVCXPRT *xprt = NULL;           /* service handle */
 209         bool_t madefd = FALSE;          /* whether fd opened here  */
 210         struct __rpc_sockinfo si;
 211         struct sockaddr_storage ss;
 212         socklen_t slen;
 213
 214         if (fd == RPC_ANYFD) {
 215                 if (nconf == NULL) {
 216                         warnx("%s: invalid netconfig", __func__);
 217                         return (NULL);
 218                 }
 219                 fd = __rpc_nconf2fd(nconf);
 220                 if (fd == -1) {
 221                         warnx("%s: could not open connection for %s", __func__,
 222                             nconf->nc_netid);
 223                         return (NULL);
 224                 }
 225                 __rpc_nconf2sockinfo(nconf, &si);
 226                 madefd = TRUE;
 227         } else {
 228                 /*
 229                  * It is an open descriptor. Get the transport info.
 230                  */
 231                 if (!__rpc_fd2sockinfo(fd, &si)) {
 232                         warnx("%s: could not get transport information",
 233                             __func__);
 234                         return (NULL);
 235                 }
 236         }
 237
 238         /*
 239          * If the fd is unbound, try to bind it.
 240          */
 241         if (madefd || !__rpc_sockisbound(fd)) {
 242                 if (bindaddr == NULL) {
 243                         if (bindresvport(fd, NULL) < 0) {
 244                                 memset(&ss, 0, sizeof ss);
 245                                 ss.ss_family = si.si_af;
 246                                 ss.ss_len = si.si_alen;
 247                                 if (bind(fd, (struct sockaddr *)(void *)&ss,
 248                                     (socklen_t)si.si_alen) < 0) {
 249                                         warn( "%s: could not bind to anonymous "
 250                                             "port", __func__);
 251                                         goto freedata;
 252                                 }
 253                         }
 254                         if (si.si_socktype != SOCK_DGRAM &&
 255                             listen(fd, SOMAXCONN) == -1) {
 256                                 warnx("%s: could not listen at anonymous port",
 257                                     __func__);
 258                                 goto freedata;
 259                         }
 260                 } else {
 261                         if (bind(fd,
 262                             (struct sockaddr *)bindaddr->addr.buf,
 263                             (socklen_t)si.si_alen) < 0) {
 264                                 warnx("%s: could not bind to requested address",
 265                                     __func__);
 266                                 goto freedata;
 267                         }
 268                         if (si.si_socktype != SOCK_DGRAM &&
 269                             listen(fd, (int)bindaddr->qlen) == -1) {
 270                                 warnx("%s: could not listen at requested "
 271                                     "address", __func__);
 272                                 goto freedata;
 273                         }
 274                 }
 275         }
 276         /*
 277          * call transport specific function.
 278          */
 279         switch (si.si_socktype) {
 280         case SOCK_STREAM:
 281                 slen = sizeof ss;
 282                 if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
 283                     == 0) {
 284                         /* accepted socket */
 285                         xprt = svc_fd_create(fd, sendsz, recvsz);
 286                 } else
 287                         xprt = svc_vc_create(fd, sendsz, recvsz);
 288                 if (!nconf || !xprt)
 289                         break;
 290 #if 0
 291                 /* XXX fvdl */
 292                 if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
 293                     strcmp(nconf->nc_protofmly, "inet6") == 0)
 294                         (void) __svc_vc_setflag(xprt, TRUE);
 295 #endif
 296                 break;
 297         case SOCK_DGRAM:
 298                 xprt = svc_dg_create(fd, sendsz, recvsz);
 299                 break;
 300         default:
 301                 warnx("%s: bad service type %u", __func__, si.si_socktype);
 302                 goto freedata;
 303         }
 304
 305         if (xprt == NULL)
 306                 /*
 307                  * The error messages here are spitted out by the lower layers:
 308                  * svc_vc_create(), svc_fd_create() and svc_dg_create().
 309                  */
 310                 goto freedata;
 311
 312         /* Fill in type of service */
 313         xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
 314
 315         if (nconf) {
 316                 xprt->xp_netid = strdup(nconf->nc_netid);
 317                 xprt->xp_tp = strdup(nconf->nc_device);
 318                 if (xprt->xp_netid == NULL || xprt->xp_tp == NULL) {
 319                         svc_destroy(xprt);
 320                         return NULL;
 321                 }
 322         }
 323         return (xprt);
 324
 325 freedata:
 326         if (madefd)
 327                 (void) close(fd);
 328         return (NULL);
 329 }