lib/libc/rpc/svc_generic.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)svc_generic.c    1.19    94/04/24 SMI; 1.21 89/02/28 Copyr 1988 Sun Micro
  30  * $NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $
  31  * $FreeBSD: src/lib/libc/rpc/svc_generic.c,v 1.7 2006/02/27 22:10:59 deischen Exp $
  32  */
  33
  34 /*
  35  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  36  */
  37
  38 /*
  39  * svc_generic.c, Server side for RPC.
  40  */
  41
  42 #include "namespace.h"
  43 #include "reentrant.h"
  44 #include <sys/types.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/nettype.h>
  49 #include <stdio.h>
  50 #include <errno.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <err.h>
  55 #include "un-namespace.h"
  56
  57 #include "rpc_com.h"
  58 #include "mt_misc.h"
  59
  60 extern int __svc_vc_setflag(SVCXPRT *, int);
  61
  62 /*
  63  * The highest level interface for server creation.
  64  * It tries for all the nettokens in that particular class of token
  65  * and returns the number of handles it can create and/or find.
  66  *
  67  * It creates a link list of all the handles it could create.
  68  * If svc_create() is called multiple times, it uses the handle
  69  * created earlier instead of creating a new handle every time.
  70  */
  71 int
  72 svc_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
  73            rpcprog_t prognum,           /* Program number */
  74            rpcvers_t versnum,           /* Version number */
  75            const char *nettype)         /* Networktype token */
  76 {
  77         struct xlist {
  78                 SVCXPRT *xprt;          /* Server handle */
  79                 struct xlist *next;     /* Next item */
  80         } *l;
  81         static struct xlist *xprtlist;  /* A link list of all the handles */
  82         int num = 0;
  83         SVCXPRT *xprt;
  84         struct netconfig *nconf;
  85         void *handle;
  86
  87 /* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
  88
  89         if ((handle = __rpc_setconf(nettype)) == NULL) {
  90                 warnx("svc_create: unknown protocol");
  91                 return (0);
  92         }
  93         while ((nconf = __rpc_getconf(handle)) != NULL) {
  94                 mutex_lock(&xprtlist_lock);
  95                 for (l = xprtlist; l; l = l->next) {
  96                         if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
  97                                 /* Found an old one, use it */
  98                                 rpcb_unset(prognum, versnum, nconf);
  99                                 if (svc_reg(l->xprt, prognum, versnum,
 100                                         dispatch, nconf) == FALSE)
 101                                         warnx(
 102                 "svc_create: could not register prog %u vers %u on %s",
 103                                         (unsigned)prognum, (unsigned)versnum,
 104                                          nconf->nc_netid);
 105                                 else
 106                                         num++;
 107                                 break;
 108                         }
 109                 }
 110                 if (l == NULL) {
 111                         /* It was not found. Now create a new one */
 112                         xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
 113                         if (xprt) {
 114                                 l = (struct xlist *)malloc(sizeof (*l));
 115                                 if (l == NULL) {
 116                                         warnx("svc_create: no memory");
 117                                         mutex_unlock(&xprtlist_lock);
 118                                         return (0);
 119                                 }
 120                                 l->xprt = xprt;
 121                                 l->next = xprtlist;
 122                                 xprtlist = l;
 123                                 num++;
 124                         }
 125                 }
 126                 mutex_unlock(&xprtlist_lock);
 127         }
 128         __rpc_endconf(handle);
 129         /*
 130          * In case of num == 0; the error messages are generated by the
 131          * underlying layers; and hence not needed here.
 132          */
 133         return (num);
 134 }
 135
 136 /*
 137  * The high level interface to svc_tli_create().
 138  * It tries to create a server for "nconf" and registers the service
 139  * with the rpcbind. It calls svc_tli_create();
 140  */
 141 SVCXPRT *
 142 svc_tp_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
 143               rpcprog_t prognum,                /* Program number */
 144               rpcvers_t versnum,                /* Version number */
 145               const struct netconfig *nconf)    /* Netconfig structure for the network */
 146 {
 147         SVCXPRT *xprt;
 148
 149         if (nconf == NULL) {
 150                 warnx(
 151         "svc_tp_create: invalid netconfig structure for prog %u vers %u",
 152                                 (unsigned)prognum, (unsigned)versnum);
 153                 return (NULL);
 154         }
 155         xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
 156         if (xprt == NULL) {
 157                 return (NULL);
 158         }
 159         /*LINTED const castaway*/
 160         rpcb_unset(prognum, versnum, (struct netconfig *) nconf);
 161         if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
 162                 warnx(
 163                 "svc_tp_create: Could not register prog %u vers %u on %s",
 164                                 (unsigned)prognum, (unsigned)versnum,
 165                                 nconf->nc_netid);
 166                 SVC_DESTROY(xprt);
 167                 return (NULL);
 168         }
 169         return (xprt);
 170 }
 171
 172 /*
 173  * If fd is RPC_ANYFD, then it opens a fd for the given transport
 174  * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
 175  * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
 176  * NULL bindadr and Connection oriented transports, the value of qlen
 177  * is set to 8.
 178  *
 179  * If sendsz or recvsz are zero, their default values are chosen.
 180  */
 181 SVCXPRT *
 182 svc_tli_create(
 183         int fd,                         /* Connection end point */
 184         const struct netconfig *nconf,  /* Netconfig struct for nettoken */
 185         const struct t_bind *bindaddr,  /* Local bind address */
 186         u_int sendsz,                   /* Max sendsize */
 187         u_int recvsz)                   /* Max recvsize */
 188 {
 189         SVCXPRT *xprt = NULL;           /* service handle */
 190         bool_t madefd = FALSE;          /* whether fd opened here  */
 191         struct __rpc_sockinfo si;
 192         struct sockaddr_storage ss;
 193         socklen_t slen;
 194
 195         if (fd == RPC_ANYFD) {
 196                 if (nconf == NULL) {
 197                         warnx("svc_tli_create: invalid netconfig");
 198                         return (NULL);
 199                 }
 200                 fd = __rpc_nconf2fd(nconf);
 201                 if (fd == -1) {
 202                         warnx(
 203                             "svc_tli_create: could not open connection for %s",
 204                                         nconf->nc_netid);
 205                         return (NULL);
 206                 }
 207                 __rpc_nconf2sockinfo(nconf, &si);
 208                 madefd = TRUE;
 209         } else {
 210                 /*
 211                  * It is an open descriptor. Get the transport info.
 212                  */
 213                 if (!__rpc_fd2sockinfo(fd, &si)) {
 214                         warnx(
 215                 "svc_tli_create: could not get transport information");
 216                         return (NULL);
 217                 }
 218         }
 219
 220         /*
 221          * If the fd is unbound, try to bind it.
 222          */
 223         if (madefd || !__rpc_sockisbound(fd)) {
 224                 if (bindaddr == NULL) {
 225                         if (bindresvport(fd, NULL) < 0) {
 226                                 memset(&ss, 0, sizeof ss);
 227                                 ss.ss_family = si.si_af;
 228                                 ss.ss_len = si.si_alen;
 229                                 if (_bind(fd, (struct sockaddr *)(void *)&ss,
 230                                     (socklen_t)si.si_alen) < 0) {
 231                                         warnx(
 232                         "svc_tli_create: could not bind to anonymous port");
 233                                         goto freedata;
 234                                 }
 235                         }
 236                         _listen(fd, SOMAXCONN);
 237                 } else {
 238                         if (_bind(fd,
 239                             (struct sockaddr *)bindaddr->addr.buf,
 240                             (socklen_t)si.si_alen) < 0) {
 241                                 warnx(
 242                 "svc_tli_create: could not bind to requested address");
 243                                 goto freedata;
 244                         }
 245                         _listen(fd, (int)bindaddr->qlen);
 246                 }
 247
 248         }
 249         /*
 250          * call transport specific function.
 251          */
 252         switch (si.si_socktype) {
 253                 case SOCK_STREAM:
 254                         slen = sizeof ss;
 255                         if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
 256                             == 0) {
 257                                 /* accepted socket */
 258                                 xprt = svc_fd_create(fd, sendsz, recvsz);
 259                         } else
 260                                 xprt = svc_vc_create(fd, sendsz, recvsz);
 261                         if (!nconf || !xprt)
 262                                 break;
 263 #if 0
 264                         /* XXX fvdl */
 265                         if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
 266                             strcmp(nconf->nc_protofmly, "inet6") == 0)
 267                                 (void) __svc_vc_setflag(xprt, TRUE);
 268 #endif
 269                         break;
 270                 case SOCK_DGRAM:
 271                         xprt = svc_dg_create(fd, sendsz, recvsz);
 272                         break;
 273                 default:
 274                         warnx("svc_tli_create: bad service type");
 275                         goto freedata;
 276         }
 277
 278         if (xprt == NULL)
 279                 /*
 280                  * The error messages here are spitted out by the lower layers:
 281                  * svc_vc_create(), svc_fd_create() and svc_dg_create().
 282                  */
 283                 goto freedata;
 284
 285         /* Fill in type of service */
 286         xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
 287
 288         if (nconf) {
 289                 xprt->xp_netid = strdup(nconf->nc_netid);
 290                 xprt->xp_tp = strdup(nconf->nc_device);
 291         }
 292         return (xprt);
 293
 294 freedata:
 295         if (madefd)
 296                 _close(fd);
 297         if (xprt) {
 298                 if (!madefd) /* so that svc_destroy doesnt close fd */
 299                         xprt->xp_fd = RPC_ANYFD;
 300                 SVC_DESTROY(xprt);
 301         }
 302         return (NULL);
 303 }