diff options
Diffstat (limited to 'sys/nfs/krpc_subr.c')
-rw-r--r-- | sys/nfs/krpc_subr.c | 470 |
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); +} |