summaryrefslogtreecommitdiffstats
path: root/sys/nfs/krpc_subr.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/nfs/krpc_subr.c')
-rw-r--r--sys/nfs/krpc_subr.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/sys/nfs/krpc_subr.c b/sys/nfs/krpc_subr.c
new file mode 100644
index 0000000..18e0f9b
--- /dev/null
+++ b/sys/nfs/krpc_subr.c
@@ -0,0 +1,470 @@
+/* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
+
+/*-
+ * Copyright (c) 1995 Gordon Ross, Adam Glass
+ * Copyright (c) 1992 Regents of the University of California.
+ * All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Lawrence Berkeley Laboratory and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * partially based on:
+ * libnetboot/rpc.c
+ * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/jail.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/proc.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/uio.h>
+
+#include <net/if.h>
+#include <net/vnet.h>
+
+#include <netinet/in.h>
+
+#include <rpc/types.h>
+#include <rpc/auth.h>
+#include <rpc/rpc_msg.h>
+#include <nfs/krpc.h>
+#include <nfs/xdr_subs.h>
+
+/*
+ * Kernel support for Sun RPC
+ *
+ * Used currently for bootstrapping in nfs diskless configurations.
+ */
+
+/*
+ * Generic RPC headers
+ */
+
+struct auth_info {
+ u_int32_t authtype; /* auth type */
+ u_int32_t authlen; /* auth length */
+};
+
+struct auth_unix {
+ int32_t ua_time;
+ int32_t ua_hostname; /* null */
+ int32_t ua_uid;
+ int32_t ua_gid;
+ int32_t ua_gidlist; /* null */
+};
+
+struct krpc_call {
+ u_int32_t rp_xid; /* request transaction id */
+ int32_t rp_direction; /* call direction (0) */
+ u_int32_t rp_rpcvers; /* rpc version (2) */
+ u_int32_t rp_prog; /* program */
+ u_int32_t rp_vers; /* version */
+ u_int32_t rp_proc; /* procedure */
+ struct auth_info rpc_auth;
+ struct auth_unix rpc_unix;
+ struct auth_info rpc_verf;
+};
+
+struct krpc_reply {
+ u_int32_t rp_xid; /* request transaction id */
+ int32_t rp_direction; /* call direction (1) */
+ int32_t rp_astatus; /* accept status (0: accepted) */
+ union {
+ u_int32_t rpu_errno;
+ struct {
+ struct auth_info rok_auth;
+ u_int32_t rok_status;
+ } rpu_rok;
+ } rp_u;
+};
+#define rp_errno rp_u.rpu_errno
+#define rp_auth rp_u.rpu_rok.rok_auth
+#define rp_status rp_u.rpu_rok.rok_status
+
+#define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
+
+/*
+ * What is the longest we will wait before re-sending a request?
+ * Note this is also the frequency of "RPC timeout" messages.
+ * The re-send loop count sup linearly to this maximum, so the
+ * first complaint will happen after (1+2+3+4+5)=15 seconds.
+ */
+#define MAX_RESEND_DELAY 5 /* seconds */
+
+/*
+ * Call portmap to lookup a port number for a particular rpc program
+ * Returns non-zero error on failure.
+ */
+int
+krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
+ struct thread *td)
+{
+ struct sdata {
+ u_int32_t prog; /* call program */
+ u_int32_t vers; /* call version */
+ u_int32_t proto; /* call protocol */
+ u_int32_t port; /* call port (unused) */
+ } *sdata;
+ struct rdata {
+ u_int16_t pad;
+ u_int16_t port;
+ } *rdata;
+ struct mbuf *m;
+ int error;
+
+ /* The portmapper port is fixed. */
+ if (prog == PMAPPROG) {
+ *portp = htons(PMAPPORT);
+ return 0;
+ }
+
+ m = m_get(M_WAIT, MT_DATA);
+ sdata = mtod(m, struct sdata *);
+ m->m_len = sizeof(*sdata);
+
+ /* Do the RPC to get it. */
+ sdata->prog = txdr_unsigned(prog);
+ sdata->vers = txdr_unsigned(vers);
+ sdata->proto = txdr_unsigned(IPPROTO_UDP);
+ sdata->port = 0;
+
+ sin->sin_port = htons(PMAPPORT);
+ error = krpc_call(sin, PMAPPROG, PMAPVERS,
+ PMAPPROC_GETPORT, &m, NULL, td);
+ if (error)
+ return error;
+
+ if (m->m_len < sizeof(*rdata)) {
+ m = m_pullup(m, sizeof(*rdata));
+ if (m == NULL)
+ return ENOBUFS;
+ }
+ rdata = mtod(m, struct rdata *);
+ *portp = rdata->port;
+
+ m_freem(m);
+ return 0;
+}
+
+/*
+ * Do a remote procedure call (RPC) and wait for its reply.
+ * If from_p is non-null, then we are doing broadcast, and
+ * the address from whence the response came is saved there.
+ */
+int
+krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
+ struct mbuf **data, struct sockaddr **from_p, struct thread *td)
+{
+ struct socket *so;
+ struct sockaddr_in *sin, ssin;
+ struct sockaddr *from;
+ struct mbuf *m, *nam, *mhead;
+ struct krpc_call *call;
+ struct krpc_reply *reply;
+ struct sockopt sopt;
+ struct timeval tv;
+ struct uio auio;
+ int error, rcvflg, timo, secs, len;
+ static u_int32_t xid = ~0xFF;
+ u_int16_t tport;
+ u_int32_t saddr;
+
+ /*
+ * Validate address family.
+ * Sorry, this is INET specific...
+ */
+ if (sa->sin_family != AF_INET)
+ return (EAFNOSUPPORT);
+
+ /* Free at end if not null. */
+ nam = mhead = NULL;
+ from = NULL;
+
+ /*
+ * Create socket and set its recieve timeout.
+ */
+ if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
+ goto out;
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ bzero(&sopt, sizeof sopt);
+ sopt.sopt_dir = SOPT_SET;
+ sopt.sopt_level = SOL_SOCKET;
+ sopt.sopt_name = SO_RCVTIMEO;
+ sopt.sopt_val = &tv;
+ sopt.sopt_valsize = sizeof tv;
+
+ if ((error = sosetopt(so, &sopt)) != 0)
+ goto out;
+
+ /*
+ * Enable broadcast if necessary.
+ */
+ if (from_p) {
+ int on = 1;
+ sopt.sopt_name = SO_BROADCAST;
+ sopt.sopt_val = &on;
+ sopt.sopt_valsize = sizeof on;
+ if ((error = sosetopt(so, &sopt)) != 0)
+ goto out;
+ }
+
+ /*
+ * Bind the local endpoint to a reserved port,
+ * because some NFS servers refuse requests from
+ * non-reserved (non-privileged) ports.
+ */
+ sin = &ssin;
+ bzero(sin, sizeof *sin);
+ sin->sin_len = sizeof(*sin);
+ sin->sin_family = AF_INET;
+ sin->sin_addr.s_addr = INADDR_ANY;
+ tport = IPPORT_RESERVED;
+ do {
+ tport--;
+ sin->sin_port = htons(tport);
+ error = sobind(so, (struct sockaddr *)sin, td);
+ } while (error == EADDRINUSE &&
+ tport > IPPORT_RESERVED / 2);
+ if (error) {
+ printf("bind failed\n");
+ goto out;
+ }
+
+ /*
+ * Setup socket address for the server.
+ */
+
+ /*
+ * Prepend RPC message header.
+ */
+ mhead = m_gethdr(M_WAIT, MT_DATA);
+ mhead->m_next = *data;
+ call = mtod(mhead, struct krpc_call *);
+ mhead->m_len = sizeof(*call);
+ bzero((caddr_t)call, sizeof(*call));
+ /* rpc_call part */
+ xid++;
+ call->rp_xid = txdr_unsigned(xid);
+ /* call->rp_direction = 0; */
+ call->rp_rpcvers = txdr_unsigned(2);
+ call->rp_prog = txdr_unsigned(prog);
+ call->rp_vers = txdr_unsigned(vers);
+ call->rp_proc = txdr_unsigned(func);
+ /* rpc_auth part (auth_unix as root) */
+ call->rpc_auth.authtype = txdr_unsigned(AUTH_UNIX);
+ call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
+ /* rpc_verf part (auth_null) */
+ call->rpc_verf.authtype = 0;
+ call->rpc_verf.authlen = 0;
+
+ /*
+ * Setup packet header
+ */
+ m_fixhdr(mhead);
+ mhead->m_pkthdr.rcvif = NULL;
+
+ /*
+ * Send it, repeatedly, until a reply is received,
+ * but delay each re-send by an increasing amount.
+ * If the delay hits the maximum, start complaining.
+ */
+ timo = 0;
+ for (;;) {
+ /* Send RPC request (or re-send). */
+ m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
+ error = sosend(so, (struct sockaddr *)sa, NULL, m,
+ NULL, 0, td);
+ if (error) {
+ printf("krpc_call: sosend: %d\n", error);
+ goto out;
+ }
+ m = NULL;
+
+ /* Determine new timeout. */
+ if (timo < MAX_RESEND_DELAY)
+ timo++;
+ else {
+ saddr = ntohl(sa->sin_addr.s_addr);
+ printf("RPC timeout for server %d.%d.%d.%d\n",
+ (saddr >> 24) & 255,
+ (saddr >> 16) & 255,
+ (saddr >> 8) & 255,
+ saddr & 255);
+ }
+
+ /*
+ * Wait for up to timo seconds for a reply.
+ * The socket receive timeout was set to 1 second.
+ */
+ secs = timo;
+ while (secs > 0) {
+ if (from) {
+ free(from, M_SONAME);
+ from = NULL;
+ }
+ if (m) {
+ m_freem(m);
+ m = NULL;
+ }
+ bzero(&auio, sizeof(auio));
+ auio.uio_resid = len = 1<<16;
+ rcvflg = 0;
+ error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
+ if (error == EWOULDBLOCK) {
+ secs--;
+ continue;
+ }
+ if (error)
+ goto out;
+ len -= auio.uio_resid;
+
+ /* Does the reply contain at least a header? */
+ if (len < MIN_REPLY_HDR)
+ continue;
+ if (m->m_len < MIN_REPLY_HDR)
+ continue;
+ reply = mtod(m, struct krpc_reply *);
+
+ /* Is it the right reply? */
+ if (reply->rp_direction != txdr_unsigned(REPLY))
+ continue;
+
+ if (reply->rp_xid != txdr_unsigned(xid))
+ continue;
+
+ /* Was RPC accepted? (authorization OK) */
+ if (reply->rp_astatus != 0) {
+ error = fxdr_unsigned(u_int32_t, reply->rp_errno);
+ printf("rpc denied, error=%d\n", error);
+ continue;
+ }
+
+ /* Did the call succeed? */
+ if (reply->rp_status != 0) {
+ error = fxdr_unsigned(u_int32_t, reply->rp_status);
+ if (error == PROG_MISMATCH) {
+ error = EBADRPC;
+ goto out;
+ }
+ printf("rpc denied, status=%d\n", error);
+ continue;
+ }
+
+ goto gotreply; /* break two levels */
+
+ } /* while secs */
+ } /* forever send/receive */
+
+ error = ETIMEDOUT;
+ goto out;
+
+ gotreply:
+
+ /*
+ * Get RPC reply header into first mbuf,
+ * get its length, then strip it off.
+ */
+ len = sizeof(*reply);
+ if (m->m_len < len) {
+ m = m_pullup(m, len);
+ if (m == NULL) {
+ error = ENOBUFS;
+ goto out;
+ }
+ }
+ reply = mtod(m, struct krpc_reply *);
+ if (reply->rp_auth.authtype != 0) {
+ len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
+ len = (len + 3) & ~3; /* XXX? */
+ }
+ m_adj(m, len);
+
+ /* result */
+ *data = m;
+ if (from_p) {
+ *from_p = from;
+ from = NULL;
+ }
+
+ out:
+ if (mhead) m_freem(mhead);
+ if (from) free(from, M_SONAME);
+ soclose(so);
+ return error;
+}
+
+/*
+ * eXternal Data Representation routines.
+ * (but with non-standard args...)
+ */
+
+/*
+ * String representation for RPC.
+ */
+struct xdr_string {
+ u_int32_t len; /* length without null or padding */
+ char data[4]; /* data (longer, of course) */
+ /* data is padded to a long-word boundary */
+};
+
+struct mbuf *
+xdr_string_encode(char *str, int len)
+{
+ struct mbuf *m;
+ struct xdr_string *xs;
+ int dlen; /* padded string length */
+ int mlen; /* message length */
+
+ dlen = (len + 3) & ~3;
+ mlen = dlen + 4;
+
+ if (mlen > MCLBYTES) /* If too big, we just can't do it. */
+ return (NULL);
+
+ m = m_get(M_WAIT, MT_DATA);
+ if (mlen > MLEN)
+ MCLGET(m, M_WAIT);
+ xs = mtod(m, struct xdr_string *);
+ m->m_len = mlen;
+ xs->len = txdr_unsigned(len);
+ bcopy(str, xs->data, len);
+ return (m);
+}
OpenPOWER on IntegriCloud