lib/libc/rpc/svc_generic.c

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * @(#)svc_generic.c    1.19    94/04/24 SMI; 1.21 89/02/28 Copyr 1988 Sun Micro
  29  * $NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $
  30  * $FreeBSD: src/lib/libc/rpc/svc_generic.c,v 1.7 2006/02/27 22:10:59 deischen Exp $
  31  */
  32
  33 /*
  34  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  35  */
  36
  37 /*
  38  * svc_generic.c, Server side for RPC.
  39  */
  40
  41 #include "namespace.h"
  42 #include "reentrant.h"
  43 #include <sys/types.h>
  44 #include <sys/socket.h>
  45 #include <netinet/in.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/nettype.h>
  48 #include <stdio.h>
  49 #include <errno.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <err.h>
  54 #include "un-namespace.h"
  55
  56 #include "rpc_com.h"
  57 #include "mt_misc.h"
  58
  59 extern int __svc_vc_setflag(SVCXPRT *, int);
  60
  61 /*
  62  * The highest level interface for server creation.
  63  * It tries for all the nettokens in that particular class of token
  64  * and returns the number of handles it can create and/or find.
  65  *
  66  * It creates a link list of all the handles it could create.
  67  * If svc_create() is called multiple times, it uses the handle
  68  * created earlier instead of creating a new handle every time.
  69  */
  70 int
  71 svc_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
  72            rpcprog_t prognum,           /* Program number */
  73            rpcvers_t versnum,           /* Version number */
  74            const char *nettype)         /* Networktype token */
  75 {
  76         struct xlist {
  77                 SVCXPRT *xprt;          /* Server handle */
  78                 struct xlist *next;     /* Next item */
  79         } *l;
  80         static struct xlist *xprtlist;  /* A link list of all the handles */
  81         int num = 0;
  82         SVCXPRT *xprt;
  83         struct netconfig *nconf;
  84         void *handle;
  85
  86 /* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
  87
  88         if ((handle = __rpc_setconf(nettype)) == NULL) {
  89                 warnx("svc_create: unknown protocol");
  90                 return (0);
  91         }
  92         while ((nconf = __rpc_getconf(handle)) != NULL) {
  93                 mutex_lock(&xprtlist_lock);
  94                 for (l = xprtlist; l; l = l->next) {
  95                         if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
  96                                 /* Found an old one, use it */
  97                                 rpcb_unset(prognum, versnum, nconf);
  98                                 if (svc_reg(l->xprt, prognum, versnum,
  99                                         dispatch, nconf) == FALSE)
 100                                         warnx(
 101                 "svc_create: could not register prog %u vers %u on %s",
 102                                         (unsigned)prognum, (unsigned)versnum,
 103                                          nconf->nc_netid);
 104                                 else
 105                                         num++;
 106                                 break;
 107                         }
 108                 }
 109                 if (l == NULL) {
 110                         /* It was not found. Now create a new one */
 111                         xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
 112                         if (xprt) {
 113                                 l = (struct xlist *)malloc(sizeof (*l));
 114                                 if (l == NULL) {
 115                                         warnx("svc_create: no memory");
 116                                         mutex_unlock(&xprtlist_lock);
 117                                         return (0);
 118                                 }
 119                                 l->xprt = xprt;
 120                                 l->next = xprtlist;
 121                                 xprtlist = l;
 122                                 num++;
 123                         }
 124                 }
 125                 mutex_unlock(&xprtlist_lock);
 126         }
 127         __rpc_endconf(handle);
 128         /*
 129          * In case of num == 0; the error messages are generated by the
 130          * underlying layers; and hence not needed here.
 131          */
 132         return (num);
 133 }
 134
 135 /*
 136  * The high level interface to svc_tli_create().
 137  * It tries to create a server for "nconf" and registers the service
 138  * with the rpcbind. It calls svc_tli_create();
 139  */
 140 SVCXPRT *
 141 svc_tp_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
 142               rpcprog_t prognum,                /* Program number */
 143               rpcvers_t versnum,                /* Version number */
 144               const struct netconfig *nconf)    /* Netconfig structure for the network */
 145 {
 146         SVCXPRT *xprt;
 147
 148         if (nconf == NULL) {
 149                 warnx(
 150         "svc_tp_create: invalid netconfig structure for prog %u vers %u",
 151                                 (unsigned)prognum, (unsigned)versnum);
 152                 return (NULL);
 153         }
 154         xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
 155         if (xprt == NULL) {
 156                 return (NULL);
 157         }
 158         /*LINTED const castaway*/
 159         rpcb_unset(prognum, versnum, (struct netconfig *) nconf);
 160         if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
 161                 warnx(
 162                 "svc_tp_create: Could not register prog %u vers %u on %s",
 163                                 (unsigned)prognum, (unsigned)versnum,
 164                                 nconf->nc_netid);
 165                 SVC_DESTROY(xprt);
 166                 return (NULL);
 167         }
 168         return (xprt);
 169 }
 170
 171 /*
 172  * If fd is RPC_ANYFD, then it opens a fd for the given transport
 173  * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
 174  * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
 175  * NULL bindadr and Connection oriented transports, the value of qlen
 176  * is set to 8.
 177  *
 178  * If sendsz or recvsz are zero, their default values are chosen.
 179  */
 180 SVCXPRT *
 181 svc_tli_create(
 182         int fd,                         /* Connection end point */
 183         const struct netconfig *nconf,  /* Netconfig struct for nettoken */
 184         const struct t_bind *bindaddr,  /* Local bind address */
 185         u_int sendsz,                   /* Max sendsize */
 186         u_int recvsz)                   /* Max recvsize */
 187 {
 188         SVCXPRT *xprt = NULL;           /* service handle */
 189         bool_t madefd = FALSE;          /* whether fd opened here  */
 190         struct __rpc_sockinfo si;
 191         struct sockaddr_storage ss;
 192         socklen_t slen;
 193
 194         if (fd == RPC_ANYFD) {
 195                 if (nconf == NULL) {
 196                         warnx("svc_tli_create: invalid netconfig");
 197                         return (NULL);
 198                 }
 199                 fd = __rpc_nconf2fd(nconf);
 200                 if (fd == -1) {
 201                         warnx(
 202                             "svc_tli_create: could not open connection for %s",
 203                                         nconf->nc_netid);
 204                         return (NULL);
 205                 }
 206                 __rpc_nconf2sockinfo(nconf, &si);
 207                 madefd = TRUE;
 208         } else {
 209                 /*
 210                  * It is an open descriptor. Get the transport info.
 211                  */
 212                 if (!__rpc_fd2sockinfo(fd, &si)) {
 213                         warnx(
 214                 "svc_tli_create: could not get transport information");
 215                         return (NULL);
 216                 }
 217         }
 218
 219         /*
 220          * If the fd is unbound, try to bind it.
 221          */
 222         if (madefd || !__rpc_sockisbound(fd)) {
 223                 if (bindaddr == NULL) {
 224                         if (bindresvport(fd, NULL) < 0) {
 225                                 memset(&ss, 0, sizeof ss);
 226                                 ss.ss_family = si.si_af;
 227                                 ss.ss_len = si.si_alen;
 228                                 if (_bind(fd, (struct sockaddr *)(void *)&ss,
 229                                     (socklen_t)si.si_alen) < 0) {
 230                                         warnx(
 231                         "svc_tli_create: could not bind to anonymous port");
 232                                         goto freedata;
 233                                 }
 234                         }
 235                         _listen(fd, SOMAXCONN);
 236                 } else {
 237                         if (_bind(fd,
 238                             (struct sockaddr *)bindaddr->addr.buf,
 239                             (socklen_t)si.si_alen) < 0) {
 240                                 warnx(
 241                 "svc_tli_create: could not bind to requested address");
 242                                 goto freedata;
 243                         }
 244                         _listen(fd, (int)bindaddr->qlen);
 245                 }
 246
 247         }
 248         /*
 249          * call transport specific function.
 250          */
 251         switch (si.si_socktype) {
 252                 case SOCK_STREAM:
 253                         slen = sizeof ss;
 254                         if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
 255                             == 0) {
 256                                 /* accepted socket */
 257                                 xprt = svc_fd_create(fd, sendsz, recvsz);
 258                         } else
 259                                 xprt = svc_vc_create(fd, sendsz, recvsz);
 260                         if (!nconf || !xprt)
 261                                 break;
 262 #if 0
 263                         /* XXX fvdl */
 264                         if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
 265                             strcmp(nconf->nc_protofmly, "inet6") == 0)
 266                                 (void) __svc_vc_setflag(xprt, TRUE);
 267 #endif
 268                         break;
 269                 case SOCK_DGRAM:
 270                         xprt = svc_dg_create(fd, sendsz, recvsz);
 271                         break;
 272                 default:
 273                         warnx("svc_tli_create: bad service type");
 274                         goto freedata;
 275         }
 276
 277         if (xprt == NULL)
 278                 /*
 279                  * The error messages here are spitted out by the lower layers:
 280                  * svc_vc_create(), svc_fd_create() and svc_dg_create().
 281                  */
 282                 goto freedata;
 283
 284         /* Fill in type of service */
 285         xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
 286
 287         if (nconf) {
 288                 xprt->xp_netid = strdup(nconf->nc_netid);
 289                 xprt->xp_tp = strdup(nconf->nc_device);
 290         }
 291         return (xprt);
 292
 293 freedata:
 294         if (madefd)
 295                 _close(fd);
 296         if (xprt) {
 297                 if (!madefd) /* so that svc_destroy doesnt close fd */
 298                         xprt->xp_fd = RPC_ANYFD;
 299                 SVC_DESTROY(xprt);
 300         }
 301         return (NULL);
 302 }