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/5.3/sys/nfsclient/krpc_subr.c 130554 2004-06-16 03:12:50Z rwatson $");
   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 <rpc/rpcclnt.h>
   61 
   62 #include <nfs/rpcv2.h>
   63 #include <nfsclient/krpc.h>
   64 #include <nfs/xdr_subs.h>
   65 
   66 /*
   67  * Kernel support for Sun RPC
   68  *
   69  * Used currently for bootstrapping in nfs diskless configurations.
   70  */
   71 
   72 /*
   73  * Generic RPC headers
   74  */
   75 
   76 struct auth_info {
   77         u_int32_t       authtype;       /* auth type */
   78         u_int32_t       authlen;        /* auth length */
   79 };
   80 
   81 struct auth_unix {
   82         int32_t   ua_time;
   83         int32_t   ua_hostname;  /* null */
   84         int32_t   ua_uid;
   85         int32_t   ua_gid;
   86         int32_t   ua_gidlist;   /* null */
   87 };
   88 
   89 struct krpc_call {
   90         u_int32_t       rp_xid;         /* request transaction id */
   91         int32_t         rp_direction;   /* call direction (0) */
   92         u_int32_t       rp_rpcvers;     /* rpc version (2) */
   93         u_int32_t       rp_prog;        /* program */
   94         u_int32_t       rp_vers;        /* version */
   95         u_int32_t       rp_proc;        /* procedure */
   96         struct  auth_info rpc_auth;
   97         struct  auth_unix rpc_unix;
   98         struct  auth_info rpc_verf;
   99 };
  100 
  101 struct krpc_reply {
  102         u_int32_t rp_xid;               /* request transaction id */
  103         int32_t  rp_direction;          /* call direction (1) */
  104         int32_t  rp_astatus;            /* accept status (0: accepted) */
  105         union {
  106                 u_int32_t rpu_errno;
  107                 struct {
  108                         struct auth_info rok_auth;
  109                         u_int32_t       rok_status;
  110                 } rpu_rok;
  111         } rp_u;
  112 };
  113 #define rp_errno  rp_u.rpu_errno
  114 #define rp_auth   rp_u.rpu_rok.rok_auth
  115 #define rp_status rp_u.rpu_rok.rok_status
  116 
  117 #define MIN_REPLY_HDR 16        /* xid, dir, astat, errno */
  118 
  119 /*
  120  * What is the longest we will wait before re-sending a request?
  121  * Note this is also the frequency of "RPC timeout" messages.
  122  * The re-send loop count sup linearly to this maximum, so the
  123  * first complaint will happen after (1+2+3+4+5)=15 seconds.
  124  */
  125 #define MAX_RESEND_DELAY 5      /* seconds */
  126 
  127 /*
  128  * Call portmap to lookup a port number for a particular rpc program
  129  * Returns non-zero error on failure.
  130  */
  131 int
  132 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
  133     struct thread *td)
  134 {
  135         struct sdata {
  136                 u_int32_t prog;         /* call program */
  137                 u_int32_t vers;         /* call version */
  138                 u_int32_t proto;        /* call protocol */
  139                 u_int32_t port;         /* call port (unused) */
  140         } *sdata;
  141         struct rdata {
  142                 u_int16_t pad;
  143                 u_int16_t port;
  144         } *rdata;
  145         struct mbuf *m;
  146         int error;
  147 
  148         /* The portmapper port is fixed. */
  149         if (prog == PMAPPROG) {
  150                 *portp = htons(PMAPPORT);
  151                 return 0;
  152         }
  153 
  154         m = m_get(M_TRYWAIT, MT_DATA);
  155         if (m == NULL)
  156                 return ENOBUFS;
  157         sdata = mtod(m, struct sdata *);
  158         m->m_len = sizeof(*sdata);
  159 
  160         /* Do the RPC to get it. */
  161         sdata->prog = txdr_unsigned(prog);
  162         sdata->vers = txdr_unsigned(vers);
  163         sdata->proto = txdr_unsigned(IPPROTO_UDP);
  164         sdata->port = 0;
  165 
  166         sin->sin_port = htons(PMAPPORT);
  167         error = krpc_call(sin, PMAPPROG, PMAPVERS,
  168                                           PMAPPROC_GETPORT, &m, NULL, td);
  169         if (error)
  170                 return error;
  171 
  172         if (m->m_len < sizeof(*rdata)) {
  173                 m = m_pullup(m, sizeof(*rdata));
  174                 if (m == NULL)
  175                         return ENOBUFS;
  176         }
  177         rdata = mtod(m, struct rdata *);
  178         *portp = rdata->port;
  179 
  180         m_freem(m);
  181         return 0;
  182 }
  183 
  184 /*
  185  * Do a remote procedure call (RPC) and wait for its reply.
  186  * If from_p is non-null, then we are doing broadcast, and
  187  * the address from whence the response came is saved there.
  188  */
  189 int
  190 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
  191     struct mbuf **data, struct sockaddr **from_p, struct thread *td)
  192 {
  193         struct socket *so;
  194         struct sockaddr_in *sin, ssin;
  195         struct sockaddr *from;
  196         struct mbuf *m, *nam, *mhead;
  197         struct krpc_call *call;
  198         struct krpc_reply *reply;
  199         struct sockopt sopt;
  200         struct timeval tv;
  201         struct uio auio;
  202         int error, rcvflg, timo, secs, len;
  203         static u_int32_t xid = ~0xFF;
  204         u_int16_t tport;
  205         u_int32_t saddr;
  206 
  207         /*
  208          * Validate address family.
  209          * Sorry, this is INET specific...
  210          */
  211         if (sa->sin_family != AF_INET)
  212                 return (EAFNOSUPPORT);
  213 
  214         /* Free at end if not null. */
  215         nam = mhead = NULL;
  216         from = NULL;
  217 
  218         NET_ASSERT_GIANT();
  219 
  220         /*
  221          * Create socket and set its recieve timeout.
  222          */
  223         if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
  224                 goto out;
  225 
  226         tv.tv_sec = 1;
  227         tv.tv_usec = 0;
  228         bzero(&sopt, sizeof sopt);
  229         sopt.sopt_dir = SOPT_SET;
  230         sopt.sopt_level = SOL_SOCKET;
  231         sopt.sopt_name = SO_RCVTIMEO;
  232         sopt.sopt_val = &tv;
  233         sopt.sopt_valsize = sizeof tv;
  234 
  235         if ((error = sosetopt(so, &sopt)) != 0)
  236                 goto out;
  237 
  238         /*
  239          * Enable broadcast if necessary.
  240          */
  241         if (from_p) {
  242                 int on = 1;
  243                 sopt.sopt_name = SO_BROADCAST;
  244                 sopt.sopt_val = &on;
  245                 sopt.sopt_valsize = sizeof on;
  246                 if ((error = sosetopt(so, &sopt)) != 0)
  247                         goto out;
  248         }
  249 
  250         /*
  251          * Bind the local endpoint to a reserved port,
  252          * because some NFS servers refuse requests from
  253          * non-reserved (non-privileged) ports.
  254          */
  255         sin = &ssin;
  256         bzero(sin, sizeof *sin);
  257         sin->sin_len = sizeof(*sin);
  258         sin->sin_family = AF_INET;
  259         sin->sin_addr.s_addr = INADDR_ANY;
  260         tport = IPPORT_RESERVED;
  261         do {
  262                 tport--;
  263                 sin->sin_port = htons(tport);
  264                 error = sobind(so, (struct sockaddr *)sin, td);
  265         } while (error == EADDRINUSE &&
  266                          tport > IPPORT_RESERVED / 2);
  267         if (error) {
  268                 printf("bind failed\n");
  269                 goto out;
  270         }
  271 
  272         /*
  273          * Setup socket address for the server.
  274          */
  275 
  276         /*
  277          * Prepend RPC message header.
  278          */
  279         mhead = m_gethdr(M_TRYWAIT, MT_DATA);
  280         mhead->m_next = *data;
  281         call = mtod(mhead, struct krpc_call *);
  282         mhead->m_len = sizeof(*call);
  283         bzero((caddr_t)call, sizeof(*call));
  284         /* rpc_call part */
  285         xid++;
  286         call->rp_xid = txdr_unsigned(xid);
  287         /* call->rp_direction = 0; */
  288         call->rp_rpcvers = txdr_unsigned(2);
  289         call->rp_prog = txdr_unsigned(prog);
  290         call->rp_vers = txdr_unsigned(vers);
  291         call->rp_proc = txdr_unsigned(func);
  292         /* rpc_auth part (auth_unix as root) */
  293         call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
  294         call->rpc_auth.authlen  = txdr_unsigned(sizeof(struct auth_unix));
  295         /* rpc_verf part (auth_null) */
  296         call->rpc_verf.authtype = 0;
  297         call->rpc_verf.authlen  = 0;
  298 
  299         /*
  300          * Setup packet header
  301          */
  302         len = 0;
  303         m = mhead;
  304         while (m) {
  305                 len += m->m_len;
  306                 m = m->m_next;
  307         }
  308         mhead->m_pkthdr.len = len;
  309         mhead->m_pkthdr.rcvif = NULL;
  310 
  311         /*
  312          * Send it, repeatedly, until a reply is received,
  313          * but delay each re-send by an increasing amount.
  314          * If the delay hits the maximum, start complaining.
  315          */
  316         timo = 0;
  317         for (;;) {
  318                 /* Send RPC request (or re-send). */
  319                 m = m_copym(mhead, 0, M_COPYALL, M_TRYWAIT);
  320                 if (m == NULL) {
  321                         error = ENOBUFS;
  322                         goto out;
  323                 }
  324                 error = sosend(so, (struct sockaddr *)sa, NULL, m,
  325                                NULL, 0, td);
  326                 if (error) {
  327                         printf("krpc_call: sosend: %d\n", error);
  328                         goto out;
  329                 }
  330                 m = NULL;
  331 
  332                 /* Determine new timeout. */
  333                 if (timo < MAX_RESEND_DELAY)
  334                         timo++;
  335                 else {
  336                         saddr = ntohl(sa->sin_addr.s_addr);
  337                         printf("RPC timeout for server %d.%d.%d.%d\n",
  338                                (saddr >> 24) & 255,
  339                                (saddr >> 16) & 255,
  340                                (saddr >> 8) & 255,
  341                                saddr & 255);
  342                 }
  343 
  344                 /*
  345                  * Wait for up to timo seconds for a reply.
  346                  * The socket receive timeout was set to 1 second.
  347                  */
  348                 secs = timo;
  349                 while (secs > 0) {
  350                         if (from) {
  351                                 FREE(from, M_SONAME);
  352                                 from = NULL;
  353                         }
  354                         if (m) {
  355                                 m_freem(m);
  356                                 m = NULL;
  357                         }
  358                         bzero(&auio, sizeof(auio));
  359                         auio.uio_resid = len = 1<<16;
  360                         rcvflg = 0;
  361                         error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
  362                         if (error == EWOULDBLOCK) {
  363                                 secs--;
  364                                 continue;
  365                         }
  366                         if (error)
  367                                 goto out;
  368                         len -= auio.uio_resid;
  369 
  370                         /* Does the reply contain at least a header? */
  371                         if (len < MIN_REPLY_HDR)
  372                                 continue;
  373                         if (m->m_len < MIN_REPLY_HDR)
  374                                 continue;
  375                         reply = mtod(m, struct krpc_reply *);
  376 
  377                         /* Is it the right reply? */
  378                         if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
  379                                 continue;
  380 
  381                         if (reply->rp_xid != txdr_unsigned(xid))
  382                                 continue;
  383 
  384                         /* Was RPC accepted? (authorization OK) */
  385                         if (reply->rp_astatus != 0) {
  386                                 error = fxdr_unsigned(u_int32_t, reply->rp_errno);
  387                                 printf("rpc denied, error=%d\n", error);
  388                                 continue;
  389                         }
  390 
  391                         /* Did the call succeed? */
  392                         if (reply->rp_status != 0) {
  393                                 error = fxdr_unsigned(u_int32_t, reply->rp_status);
  394                                 if (error == RPC_PROGMISMATCH) {
  395                                   error = EBADRPC;
  396                                   goto out;
  397                                 }
  398                                 printf("rpc denied, status=%d\n", error);
  399                                 continue;
  400                         }
  401 
  402                         goto gotreply;  /* break two levels */
  403 
  404                 } /* while secs */
  405         } /* forever send/receive */
  406 
  407         error = ETIMEDOUT;
  408         goto out;
  409 
  410  gotreply:
  411 
  412         /*
  413          * Get RPC reply header into first mbuf,
  414          * get its length, then strip it off.
  415          */
  416         len = sizeof(*reply);
  417         if (m->m_len < len) {
  418                 m = m_pullup(m, len);
  419                 if (m == NULL) {
  420                         error = ENOBUFS;
  421                         goto out;
  422                 }
  423         }
  424         reply = mtod(m, struct krpc_reply *);
  425         if (reply->rp_auth.authtype != 0) {
  426                 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
  427                 len = (len + 3) & ~3; /* XXX? */
  428         }
  429         m_adj(m, len);
  430 
  431         /* result */
  432         *data = m;
  433         if (from_p) {
  434                 *from_p = from;
  435                 from = NULL;
  436         }
  437 
  438  out:
  439         if (mhead) m_freem(mhead);
  440         if (from) free(from, M_SONAME);
  441         soclose(so);
  442         return error;
  443 }
  444 
  445 /*
  446  * eXternal Data Representation routines.
  447  * (but with non-standard args...)
  448  */
  449 
  450 /*
  451  * String representation for RPC.
  452  */
  453 struct xdr_string {
  454         u_int32_t len;          /* length without null or padding */
  455         char data[4];   /* data (longer, of course) */
  456     /* data is padded to a long-word boundary */
  457 };
  458 
  459 struct mbuf *
  460 xdr_string_encode(char *str, int len)
  461 {
  462         struct mbuf *m;
  463         struct xdr_string *xs;
  464         int dlen;       /* padded string length */
  465         int mlen;       /* message length */
  466 
  467         dlen = (len + 3) & ~3;
  468         mlen = dlen + 4;
  469 
  470         if (mlen > MCLBYTES)            /* If too big, we just can't do it. */
  471                 return (NULL);
  472 
  473         m = m_get(M_TRYWAIT, MT_DATA);
  474         if (mlen > MLEN) {
  475                 MCLGET(m, M_TRYWAIT);
  476                 if ((m->m_flags & M_EXT) == 0) {
  477                         (void) m_free(m);       /* There can be only one. */
  478                         return (NULL);
  479                 }
  480         }
  481         xs = mtod(m, struct xdr_string *);
  482         m->m_len = mlen;
  483         xs->len = txdr_unsigned(len);
  484         bcopy(str, xs->data, len);
  485         return (m);
  486 }

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