/* 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 /* __FBSDID("FreeBSD: head/sys/nfs/krpc_subr.c 298788 2016-04-29 16:07:25Z pfg "); */ __RCSID("$NetBSD: krpc_subr.c,v 1.6 2016/11/18 22:37:50 pgoyette Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include /* * 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_WAITOK, 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) goto out; 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; out: m_freem(m); return error; } /* * 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 receive timeout. */ if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td))) return error; 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_WAITOK, MT_DATA); mhead->m_next = *data; *data = NULL; 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); m_reset_rcvif(mhead); /* * 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_WAITOK); 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_get2(mlen, M_WAITOK, MT_DATA, 0); xs = mtod(m, struct xdr_string *); m->m_len = mlen; xs->len = txdr_unsigned(len); bcopy(str, xs->data, len); return (m); }