The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_generic.c

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    1 /*      $NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $ */
    2 
    3 /*
    4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    5  * unrestricted use provided that this legend is included on all tape
    6  * media and as a part of the software program in whole or part.  Users
    7  * may copy or modify Sun RPC without charge, but are not authorized
    8  * to license or distribute it to anyone else except as part of a product or
    9  * program developed by the user.
   10  * 
   11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   14  * 
   15  * Sun RPC is provided with no support and without any obligation on the
   16  * part of Sun Microsystems, Inc. to assist in its use, correction,
   17  * modification or enhancement.
   18  * 
   19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   21  * OR ANY PART THEREOF.
   22  * 
   23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   24  * or profits or other special, indirect and consequential damages, even if
   25  * Sun has been advised of the possibility of such damages.
   26  * 
   27  * Sun Microsystems, Inc.
   28  * 2550 Garcia Avenue
   29  * Mountain View, California  94043
   30  */
   31 
   32 /*
   33  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
   34  */
   35 
   36 #if defined(LIBC_SCCS) && !defined(lint)
   37 #ident  "@(#)svc_generic.c      1.19    94/04/24 SMI" 
   38 static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
   39 #endif
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD: releng/9.1/sys/rpc/svc_generic.c 218757 2011-02-16 21:29:13Z bz $");
   42 
   43 /*
   44  * svc_generic.c, Server side for RPC.
   45  *
   46  */
   47 
   48 #include "opt_inet6.h"
   49 
   50 #include <sys/param.h>
   51 #include <sys/lock.h>
   52 #include <sys/kernel.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mutex.h>
   55 #include <sys/protosw.h>
   56 #include <sys/queue.h>
   57 #include <sys/socket.h>
   58 #include <sys/socketvar.h>
   59 #include <sys/systm.h>
   60 #include <sys/sx.h>
   61 #include <sys/ucred.h>
   62 
   63 #include <net/vnet.h>
   64 
   65 #include <rpc/rpc.h>
   66 #include <rpc/rpcb_clnt.h>
   67 #include <rpc/nettype.h>
   68 
   69 #include <rpc/rpc_com.h>
   70 
   71 extern int __svc_vc_setflag(SVCXPRT *, int);
   72 
   73 /*
   74  * The highest level interface for server creation.
   75  * It tries for all the nettokens in that particular class of token
   76  * and returns the number of handles it can create and/or find.
   77  *
   78  * It creates a link list of all the handles it could create.
   79  * If svc_create() is called multiple times, it uses the handle
   80  * created earlier instead of creating a new handle every time.
   81  */
   82 int
   83 svc_create(
   84         SVCPOOL *pool,
   85         void (*dispatch)(struct svc_req *, SVCXPRT *),
   86         rpcprog_t prognum,              /* Program number */
   87         rpcvers_t versnum,              /* Version number */
   88         const char *nettype)            /* Networktype token */
   89 {
   90         int num = 0;
   91         SVCXPRT *xprt;
   92         struct netconfig *nconf;
   93         void *handle;
   94 
   95         if ((handle = __rpc_setconf(nettype)) == NULL) {
   96                 printf("svc_create: unknown protocol");
   97                 return (0);
   98         }
   99         while ((nconf = __rpc_getconf(handle)) != NULL) {
  100                 mtx_lock(&pool->sp_lock);
  101                 TAILQ_FOREACH(xprt, &pool->sp_xlist, xp_link) {
  102                         if (strcmp(xprt->xp_netid, nconf->nc_netid) == 0) {
  103                                 /* Found an old one, use it */
  104                                 mtx_unlock(&pool->sp_lock);
  105                                 (void) rpcb_unset(prognum, versnum, nconf);
  106                                 if (svc_reg(xprt, prognum, versnum,
  107                                         dispatch, nconf) == FALSE) {
  108                                         printf(
  109                 "svc_create: could not register prog %u vers %u on %s\n",
  110                                         (unsigned)prognum, (unsigned)versnum,
  111                                          nconf->nc_netid);
  112                                         mtx_lock(&pool->sp_lock);
  113                                 } else {
  114                                         num++;
  115                                         mtx_lock(&pool->sp_lock);
  116                                         break;
  117                                 }
  118                         }
  119                 }
  120                 mtx_unlock(&pool->sp_lock);
  121                 if (xprt == NULL) {
  122                         /* It was not found. Now create a new one */
  123                         xprt = svc_tp_create(pool, dispatch, prognum, versnum,
  124                             NULL, nconf);
  125                         if (xprt) {
  126                                 num++;
  127                                 SVC_RELEASE(xprt);
  128                         }
  129                 }
  130         }
  131         __rpc_endconf(handle);
  132         /*
  133          * In case of num == 0; the error messages are generated by the
  134          * underlying layers; and hence not needed here.
  135          */
  136         return (num);
  137 }
  138 
  139 /*
  140  * The high level interface to svc_tli_create().
  141  * It tries to create a server for "nconf" and registers the service
  142  * with the rpcbind. It calls svc_tli_create();
  143  */
  144 SVCXPRT *
  145 svc_tp_create(
  146         SVCPOOL *pool,
  147         void (*dispatch)(struct svc_req *, SVCXPRT *),
  148         rpcprog_t prognum,              /* Program number */
  149         rpcvers_t versnum,              /* Version number */
  150         const char *uaddr,              /* Address (or null for default) */
  151         const struct netconfig *nconf) /* Netconfig structure for the network */
  152 {
  153         struct netconfig nconfcopy;
  154         struct netbuf *taddr;
  155         struct t_bind bind;
  156         SVCXPRT *xprt;
  157 
  158         if (nconf == NULL) {
  159                 printf(
  160         "svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
  161                                 (unsigned)prognum, (unsigned)versnum);
  162                 return (NULL);
  163         }
  164         if (uaddr) {
  165                 taddr = uaddr2taddr(nconf, uaddr);
  166                 bind.addr = *taddr;
  167                 free(taddr, M_RPC);
  168                 bind.qlen = SOMAXCONN;
  169                 xprt = svc_tli_create(pool, NULL, nconf, &bind, 0, 0);
  170                 free(bind.addr.buf, M_RPC);
  171         } else {
  172                 xprt = svc_tli_create(pool, NULL, nconf, NULL, 0, 0);
  173         }
  174         if (xprt == NULL) {
  175                 return (NULL);
  176         }
  177         /*LINTED const castaway*/
  178         nconfcopy = *nconf;
  179         (void) rpcb_unset(prognum, versnum, &nconfcopy);
  180         if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
  181                 printf(
  182                 "svc_tp_create: Could not register prog %u vers %u on %s\n",
  183                                 (unsigned)prognum, (unsigned)versnum,
  184                                 nconf->nc_netid);
  185                 xprt_unregister(xprt);
  186                 SVC_RELEASE(xprt);
  187                 return (NULL);
  188         }
  189         return (xprt);
  190 }
  191 
  192 /*
  193  * If so is NULL, then it opens a socket for the given transport
  194  * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
  195  * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
  196  * NULL bindadr and Connection oriented transports, the value of qlen
  197  * is set to 8.
  198  *
  199  * If sendsz or recvsz are zero, their default values are chosen.
  200  */
  201 SVCXPRT *
  202 svc_tli_create(
  203         SVCPOOL *pool,
  204         struct socket *so,              /* Connection end point */
  205         const struct netconfig *nconf,  /* Netconfig struct for nettoken */
  206         const struct t_bind *bindaddr,  /* Local bind address */
  207         size_t sendsz,                  /* Max sendsize */
  208         size_t recvsz)                  /* Max recvsize */
  209 {
  210         SVCXPRT *xprt = NULL;           /* service handle */
  211         bool_t madeso = FALSE;          /* whether so opened here  */
  212         struct __rpc_sockinfo si;
  213         struct sockaddr_storage ss;
  214 
  215         if (!so) {
  216                 if (nconf == NULL) {
  217                         printf("svc_tli_create: invalid netconfig\n");
  218                         return (NULL);
  219                 }
  220                 so = __rpc_nconf2socket(nconf);
  221                 if (!so) {
  222                         printf(
  223                             "svc_tli_create: could not open connection for %s\n",
  224                                         nconf->nc_netid);
  225                         return (NULL);
  226                 }
  227                 __rpc_nconf2sockinfo(nconf, &si);
  228                 madeso = TRUE;
  229         } else {
  230                 /*
  231                  * It is an open socket. Get the transport info.
  232                  */
  233                 if (!__rpc_socket2sockinfo(so, &si)) {
  234                         printf(
  235                 "svc_tli_create: could not get transport information\n");
  236                         return (NULL);
  237                 }
  238         }
  239 
  240         /*
  241          * If the socket is unbound, try to bind it.
  242          */
  243         if (madeso || !__rpc_sockisbound(so)) {
  244                 if (bindaddr == NULL) {
  245                         if (bindresvport(so, NULL)) {
  246                                 memset(&ss, 0, sizeof ss);
  247                                 ss.ss_family = si.si_af;
  248                                 ss.ss_len = si.si_alen;
  249                                 if (sobind(so, (struct sockaddr *)&ss,
  250                                         curthread)) {
  251                                         printf(
  252                         "svc_tli_create: could not bind to anonymous port\n");
  253                                         goto freedata;
  254                                 }
  255                         }
  256                         solisten(so, SOMAXCONN, curthread);
  257                 } else {
  258                         if (bindresvport(so,
  259                                 (struct sockaddr *)bindaddr->addr.buf)) {
  260                                 printf(
  261                 "svc_tli_create: could not bind to requested address\n");
  262                                 goto freedata;
  263                         }
  264                         solisten(so, (int)bindaddr->qlen, curthread);
  265                 }
  266                         
  267         }
  268         /*
  269          * call transport specific function.
  270          */
  271         switch (si.si_socktype) {
  272                 case SOCK_STREAM:
  273 #if 0
  274                         slen = sizeof ss;
  275                         if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
  276                             == 0) {
  277                                 /* accepted socket */
  278                                 xprt = svc_fd_create(fd, sendsz, recvsz);
  279                         } else
  280 #endif
  281                                 xprt = svc_vc_create(pool, so, sendsz, recvsz);
  282                         if (!nconf || !xprt)
  283                                 break;
  284 #if 0
  285                         /* XXX fvdl */
  286                         if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
  287                             strcmp(nconf->nc_protofmly, "inet6") == 0)
  288                                 (void) __svc_vc_setflag(xprt, TRUE);
  289 #endif
  290                         break;
  291                 case SOCK_DGRAM:
  292                         xprt = svc_dg_create(pool, so, sendsz, recvsz);
  293                         break;
  294                 default:
  295                         printf("svc_tli_create: bad service type");
  296                         goto freedata;
  297         }
  298 
  299         if (xprt == NULL)
  300                 /*
  301                  * The error messages here are spitted out by the lower layers:
  302                  * svc_vc_create(), svc_fd_create() and svc_dg_create().
  303                  */
  304                 goto freedata;
  305 
  306         /* Fill in type of service */
  307         xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
  308 
  309         if (nconf) {
  310                 xprt->xp_netid = strdup(nconf->nc_netid, M_RPC);
  311         }
  312         return (xprt);
  313 
  314 freedata:
  315         if (madeso)
  316                 (void)soclose(so);
  317         if (xprt) {
  318                 if (!madeso) /* so that svc_destroy doesnt close fd */
  319                         xprt->xp_socket = NULL;
  320                 xprt_unregister(xprt);
  321         }
  322         return (NULL);
  323 }

Cache object: aed641f660f1d810ea32d002b0322e4e


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