The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/krpc_subr.c

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    1 /*      $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1995 Gordon Ross, Adam Glass
    5  * Copyright (c) 1992 Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * This software was developed by the Computer Systems Engineering group
    9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   10  * contributed to Berkeley.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by the University of
   23  *      California, Lawrence Berkeley Laboratory and its contributors.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  * partially based on:
   41  *      libnetboot/rpc.c
   42  *               @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp  (LBL)
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD: releng/5.0/sys/nfsclient/krpc_subr.c 91406 2002-02-27 18:32:23Z jhb $");
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/malloc.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/proc.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/uio.h>
   56 
   57 #include <net/if.h>
   58 #include <netinet/in.h>
   59 
   60 #include <nfs/rpcv2.h>
   61 #include <nfsclient/krpc.h>
   62 #include <nfs/xdr_subs.h>
   63 
   64 /*
   65  * Kernel support for Sun RPC
   66  *
   67  * Used currently for bootstrapping in nfs diskless configurations.
   68  */
   69 
   70 /*
   71  * Generic RPC headers
   72  */
   73 
   74 struct auth_info {
   75         u_int32_t       authtype;       /* auth type */
   76         u_int32_t       authlen;        /* auth length */
   77 };
   78 
   79 struct auth_unix {
   80         int32_t   ua_time;
   81         int32_t   ua_hostname;  /* null */
   82         int32_t   ua_uid;
   83         int32_t   ua_gid;
   84         int32_t   ua_gidlist;   /* null */
   85 };
   86 
   87 struct rpc_call {
   88         u_int32_t       rp_xid;         /* request transaction id */
   89         int32_t         rp_direction;   /* call direction (0) */
   90         u_int32_t       rp_rpcvers;     /* rpc version (2) */
   91         u_int32_t       rp_prog;        /* program */
   92         u_int32_t       rp_vers;        /* version */
   93         u_int32_t       rp_proc;        /* procedure */
   94         struct  auth_info rpc_auth;
   95         struct  auth_unix rpc_unix;
   96         struct  auth_info rpc_verf;
   97 };
   98 
   99 struct rpc_reply {
  100         u_int32_t rp_xid;               /* request transaction id */
  101         int32_t  rp_direction;          /* call direction (1) */
  102         int32_t  rp_astatus;            /* accept status (0: accepted) */
  103         union {
  104                 u_int32_t rpu_errno;
  105                 struct {
  106                         struct auth_info rok_auth;
  107                         u_int32_t       rok_status;
  108                 } rpu_rok;
  109         } rp_u;
  110 };
  111 #define rp_errno  rp_u.rpu_errno
  112 #define rp_auth   rp_u.rpu_rok.rok_auth
  113 #define rp_status rp_u.rpu_rok.rok_status
  114 
  115 #define MIN_REPLY_HDR 16        /* xid, dir, astat, errno */
  116 
  117 /*
  118  * What is the longest we will wait before re-sending a request?
  119  * Note this is also the frequency of "RPC timeout" messages.
  120  * The re-send loop count sup linearly to this maximum, so the
  121  * first complaint will happen after (1+2+3+4+5)=15 seconds.
  122  */
  123 #define MAX_RESEND_DELAY 5      /* seconds */
  124 
  125 /*
  126  * Call portmap to lookup a port number for a particular rpc program
  127  * Returns non-zero error on failure.
  128  */
  129 int
  130 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
  131     struct thread *td)
  132 {
  133         struct sdata {
  134                 u_int32_t prog;         /* call program */
  135                 u_int32_t vers;         /* call version */
  136                 u_int32_t proto;        /* call protocol */
  137                 u_int32_t port;         /* call port (unused) */
  138         } *sdata;
  139         struct rdata {
  140                 u_int16_t pad;
  141                 u_int16_t port;
  142         } *rdata;
  143         struct mbuf *m;
  144         int error;
  145 
  146         /* The portmapper port is fixed. */
  147         if (prog == PMAPPROG) {
  148                 *portp = htons(PMAPPORT);
  149                 return 0;
  150         }
  151 
  152         m = m_get(M_TRYWAIT, MT_DATA);
  153         if (m == NULL)
  154                 return ENOBUFS;
  155         sdata = mtod(m, struct sdata *);
  156         m->m_len = sizeof(*sdata);
  157 
  158         /* Do the RPC to get it. */
  159         sdata->prog = txdr_unsigned(prog);
  160         sdata->vers = txdr_unsigned(vers);
  161         sdata->proto = txdr_unsigned(IPPROTO_UDP);
  162         sdata->port = 0;
  163 
  164         sin->sin_port = htons(PMAPPORT);
  165         error = krpc_call(sin, PMAPPROG, PMAPVERS,
  166                                           PMAPPROC_GETPORT, &m, NULL, td);
  167         if (error)
  168                 return error;
  169 
  170         if (m->m_len < sizeof(*rdata)) {
  171                 m = m_pullup(m, sizeof(*rdata));
  172                 if (m == NULL)
  173                         return ENOBUFS;
  174         }
  175         rdata = mtod(m, struct rdata *);
  176         *portp = rdata->port;
  177 
  178         m_freem(m);
  179         return 0;
  180 }
  181 
  182 /*
  183  * Do a remote procedure call (RPC) and wait for its reply.
  184  * If from_p is non-null, then we are doing broadcast, and
  185  * the address from whence the response came is saved there.
  186  */
  187 int
  188 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
  189     struct mbuf **data, struct sockaddr **from_p, struct thread *td)
  190 {
  191         struct socket *so;
  192         struct sockaddr_in *sin, ssin;
  193         struct sockaddr *from;
  194         struct mbuf *m, *nam, *mhead;
  195         struct rpc_call *call;
  196         struct rpc_reply *reply;
  197         struct sockopt sopt;
  198         struct timeval tv;
  199         struct uio auio;
  200         int error, rcvflg, timo, secs, len;
  201         static u_int32_t xid = ~0xFF;
  202         u_int16_t tport;
  203         u_int32_t saddr;
  204 
  205         /*
  206          * Validate address family.
  207          * Sorry, this is INET specific...
  208          */
  209         if (sa->sin_family != AF_INET)
  210                 return (EAFNOSUPPORT);
  211 
  212         /* Free at end if not null. */
  213         nam = mhead = NULL;
  214         from = NULL;
  215 
  216         /*
  217          * Create socket and set its recieve timeout.
  218          */
  219         if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
  220                 goto out;
  221 
  222         tv.tv_sec = 1;
  223         tv.tv_usec = 0;
  224         bzero(&sopt, sizeof sopt);
  225         sopt.sopt_level = SOL_SOCKET;
  226         sopt.sopt_name = SO_RCVTIMEO;
  227         sopt.sopt_val = &tv;
  228         sopt.sopt_valsize = sizeof tv;
  229 
  230         if ((error = sosetopt(so, &sopt)) != 0)
  231                 goto out;
  232 
  233         /*
  234          * Enable broadcast if necessary.
  235          */
  236         if (from_p) {
  237                 int on = 1;
  238                 sopt.sopt_name = SO_BROADCAST;
  239                 sopt.sopt_val = &on;
  240                 sopt.sopt_valsize = sizeof on;
  241                 if ((error = sosetopt(so, &sopt)) != 0)
  242                         goto out;
  243         }
  244 
  245         /*
  246          * Bind the local endpoint to a reserved port,
  247          * because some NFS servers refuse requests from
  248          * non-reserved (non-privileged) ports.
  249          */
  250         sin = &ssin;
  251         bzero(sin, sizeof *sin);
  252         sin->sin_len = sizeof(*sin);
  253         sin->sin_family = AF_INET;
  254         sin->sin_addr.s_addr = INADDR_ANY;
  255         tport = IPPORT_RESERVED;
  256         do {
  257                 tport--;
  258                 sin->sin_port = htons(tport);
  259                 error = sobind(so, (struct sockaddr *)sin, td);
  260         } while (error == EADDRINUSE &&
  261                          tport > IPPORT_RESERVED / 2);
  262         if (error) {
  263                 printf("bind failed\n");
  264                 goto out;
  265         }
  266 
  267         /*
  268          * Setup socket address for the server.
  269          */
  270 
  271         /*
  272          * Prepend RPC message header.
  273          */
  274         mhead = m_gethdr(M_TRYWAIT, MT_DATA);
  275         mhead->m_next = *data;
  276         call = mtod(mhead, struct rpc_call *);
  277         mhead->m_len = sizeof(*call);
  278         bzero((caddr_t)call, sizeof(*call));
  279         /* rpc_call part */
  280         xid++;
  281         call->rp_xid = txdr_unsigned(xid);
  282         /* call->rp_direction = 0; */
  283         call->rp_rpcvers = txdr_unsigned(2);
  284         call->rp_prog = txdr_unsigned(prog);
  285         call->rp_vers = txdr_unsigned(vers);
  286         call->rp_proc = txdr_unsigned(func);
  287         /* rpc_auth part (auth_unix as root) */
  288         call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
  289         call->rpc_auth.authlen  = txdr_unsigned(sizeof(struct auth_unix));
  290         /* rpc_verf part (auth_null) */
  291         call->rpc_verf.authtype = 0;
  292         call->rpc_verf.authlen  = 0;
  293 
  294         /*
  295          * Setup packet header
  296          */
  297         len = 0;
  298         m = mhead;
  299         while (m) {
  300                 len += m->m_len;
  301                 m = m->m_next;
  302         }
  303         mhead->m_pkthdr.len = len;
  304         mhead->m_pkthdr.rcvif = NULL;
  305 
  306         /*
  307          * Send it, repeatedly, until a reply is received,
  308          * but delay each re-send by an increasing amount.
  309          * If the delay hits the maximum, start complaining.
  310          */
  311         timo = 0;
  312         for (;;) {
  313                 /* Send RPC request (or re-send). */
  314                 m = m_copym(mhead, 0, M_COPYALL, M_TRYWAIT);
  315                 if (m == NULL) {
  316                         error = ENOBUFS;
  317                         goto out;
  318                 }
  319                 error = sosend(so, (struct sockaddr *)sa, NULL, m,
  320                                NULL, 0, td);
  321                 if (error) {
  322                         printf("krpc_call: sosend: %d\n", error);
  323                         goto out;
  324                 }
  325                 m = NULL;
  326 
  327                 /* Determine new timeout. */
  328                 if (timo < MAX_RESEND_DELAY)
  329                         timo++;
  330                 else {
  331                         saddr = ntohl(sa->sin_addr.s_addr);
  332                         printf("RPC timeout for server %d.%d.%d.%d\n",
  333                                (saddr >> 24) & 255,
  334                                (saddr >> 16) & 255,
  335                                (saddr >> 8) & 255,
  336                                saddr & 255);
  337                 }
  338 
  339                 /*
  340                  * Wait for up to timo seconds for a reply.
  341                  * The socket receive timeout was set to 1 second.
  342                  */
  343                 secs = timo;
  344                 while (secs > 0) {
  345                         if (from) {
  346                                 FREE(from, M_SONAME);
  347                                 from = NULL;
  348                         }
  349                         if (m) {
  350                                 m_freem(m);
  351                                 m = NULL;
  352                         }
  353                         bzero(&auio, sizeof(auio));
  354                         auio.uio_resid = len = 1<<16;
  355                         rcvflg = 0;
  356                         error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
  357                         if (error == EWOULDBLOCK) {
  358                                 secs--;
  359                                 continue;
  360                         }
  361                         if (error)
  362                                 goto out;
  363                         len -= auio.uio_resid;
  364 
  365                         /* Does the reply contain at least a header? */
  366                         if (len < MIN_REPLY_HDR)
  367                                 continue;
  368                         if (m->m_len < MIN_REPLY_HDR)
  369                                 continue;
  370                         reply = mtod(m, struct rpc_reply *);
  371 
  372                         /* Is it the right reply? */
  373                         if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
  374                                 continue;
  375 
  376                         if (reply->rp_xid != txdr_unsigned(xid))
  377                                 continue;
  378 
  379                         /* Was RPC accepted? (authorization OK) */
  380                         if (reply->rp_astatus != 0) {
  381                                 error = fxdr_unsigned(u_int32_t, reply->rp_errno);
  382                                 printf("rpc denied, error=%d\n", error);
  383                                 continue;
  384                         }
  385 
  386                         /* Did the call succeed? */
  387                         if (reply->rp_status != 0) {
  388                                 error = fxdr_unsigned(u_int32_t, reply->rp_status);
  389                                 if (error == RPC_PROGMISMATCH) {
  390                                   error = EBADRPC;
  391                                   goto out;
  392                                 }
  393                                 printf("rpc denied, status=%d\n", error);
  394                                 continue;
  395                         }
  396 
  397                         goto gotreply;  /* break two levels */
  398 
  399                 } /* while secs */
  400         } /* forever send/receive */
  401 
  402         error = ETIMEDOUT;
  403         goto out;
  404 
  405  gotreply:
  406 
  407         /*
  408          * Get RPC reply header into first mbuf,
  409          * get its length, then strip it off.
  410          */
  411         len = sizeof(*reply);
  412         if (m->m_len < len) {
  413                 m = m_pullup(m, len);
  414                 if (m == NULL) {
  415                         error = ENOBUFS;
  416                         goto out;
  417                 }
  418         }
  419         reply = mtod(m, struct rpc_reply *);
  420         if (reply->rp_auth.authtype != 0) {
  421                 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
  422                 len = (len + 3) & ~3; /* XXX? */
  423         }
  424         m_adj(m, len);
  425 
  426         /* result */
  427         *data = m;
  428         if (from_p) {
  429                 *from_p = from;
  430                 from = NULL;
  431         }
  432 
  433  out:
  434         if (mhead) m_freem(mhead);
  435         if (from) free(from, M_SONAME);
  436         soclose(so);
  437         return error;
  438 }
  439 
  440 /*
  441  * eXternal Data Representation routines.
  442  * (but with non-standard args...)
  443  */
  444 
  445 /*
  446  * String representation for RPC.
  447  */
  448 struct xdr_string {
  449         u_int32_t len;          /* length without null or padding */
  450         char data[4];   /* data (longer, of course) */
  451     /* data is padded to a long-word boundary */
  452 };
  453 
  454 struct mbuf *
  455 xdr_string_encode(char *str, int len)
  456 {
  457         struct mbuf *m;
  458         struct xdr_string *xs;
  459         int dlen;       /* padded string length */
  460         int mlen;       /* message length */
  461 
  462         dlen = (len + 3) & ~3;
  463         mlen = dlen + 4;
  464 
  465         if (mlen > MCLBYTES)            /* If too big, we just can't do it. */
  466                 return (NULL);
  467 
  468         m = m_get(M_TRYWAIT, MT_DATA);
  469         if (mlen > MLEN) {
  470                 MCLGET(m, M_TRYWAIT);
  471                 if ((m->m_flags & M_EXT) == 0) {
  472                         (void) m_free(m);       /* There can be only one. */
  473                         return (NULL);
  474                 }
  475         }
  476         xs = mtod(m, struct xdr_string *);
  477         m->m_len = mlen;
  478         xs->len = txdr_unsigned(len);
  479         bcopy(str, xs->data, len);
  480         return (m);
  481 }

Cache object: f5a1675cf430719396eb7e78f0359326


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