/* $NetBSD: krpc_subr.c,v 1.44 2024/10/20 14:01:52 mlelstv 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 __KERNEL_RCSID(0, "$NetBSD: krpc_subr.c,v 1.44 2024/10/20 14:01:52 mlelstv Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX NFSX_V3FHMAX for next */ #include #include #include /* XXX decl nfs_boot_sendrecv */ /* * 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 rpc_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 rpc_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 { /* rejected */ struct { u_int32_t rej_stat; u_int32_t rej_val1; u_int32_t rej_val2; } rpu_rej; /* accepted */ struct { struct auth_info rok_auth; u_int32_t rok_status; } rpu_rok; } rp_u; }; #define rp_rstat rp_u.rpu_rej.rej_stat #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 */ static int krpccheck(struct mbuf**, void*); /* * 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_int proto, u_int16_t *portp, struct lwp *l) /* sin: server address */ /* prog, vers, proto: host order */ /* portp: network order */ { 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(proto); sdata->port = 0; sin->sin_port = htons(PMAPPORT); error = krpc_call(sin, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT, &m, NULL, l); 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; } static int krpccheck(struct mbuf **mp, void *context) { struct rpc_reply *reply; struct mbuf *m = *mp; /* Does the reply contain at least a header? */ if (m->m_pkthdr.len < MIN_REPLY_HDR) return(-1); if (m->m_len < sizeof(struct rpc_reply)) { m = *mp = m_pullup(m, sizeof(struct rpc_reply)); if (m == NULL) return(-1); } reply = mtod(m, struct rpc_reply *); /* Is it the right reply? */ if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) return(-1); if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) return(-1); 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 mbuf **from_p, struct lwp *l) /* data: input/output */ /* from_p: output */ { struct socket *so; struct sockaddr_in sin; struct mbuf *m, *mhead, *from; struct rpc_call *call; struct rpc_reply *reply; int error, len; static u_int32_t xid = ~0xFF; u_int16_t tport; /* * Validate address family. * Sorry, this is INET specific... */ if (sa->sin_family != AF_INET) return (EAFNOSUPPORT); /* Free at end if not null. */ mhead = NULL; from = NULL; /* * Create socket and set its receive timeout. */ if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL))) return error; if ((error = nfs_boot_setrecvtimo(so))) goto out; /* * Enable broadcast if necessary. */ if (from_p) { if ((error = nfs_boot_enbroadcast(so))) goto out; } /* * Bind the local endpoint to a reserved port, * because some NFS servers refuse requests from * non-reserved (non-privileged) ports. */ tport = IPPORT_RESERVED; do { tport--; error = nfs_boot_sobind_ipport(so, tport, l); } while (error == EADDRINUSE && tport > IPPORT_RESERVED / 2); if (error) { printf("bind failed\n"); goto out; } /* * Setup socket address for the server. */ sin = *sa; /* * Prepend RPC message header. */ mhead = m_gethdr(M_WAIT, MT_DATA); MCLAIM(mhead, &nfs_mowner); mhead->m_next = *data; call = mtod(mhead, struct rpc_call *); mhead->m_len = sizeof(*call); memset((void *)call, 0, 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(RPCAUTH_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 */ len = 0; m = mhead; while (m) { len += m->m_len; m = m->m_next; } mhead->m_pkthdr.len = len; m_reset_rcvif(mhead); error = nfs_boot_sendrecv(so, &sin, NULL, mhead, krpccheck, &m, &from, &xid, l); if (error) goto out; /* m_pullup() was done in krpccheck() */ reply = mtod(m, struct rpc_reply *); /* Was RPC accepted? (authorization OK) */ if (reply->rp_astatus != 0) { /* Note: This is NOT an error code! */ error = fxdr_unsigned(u_int32_t, reply->rp_rstat); switch (error) { case RPC_MISMATCH: /* .re_status = RPC_VERSMISMATCH; */ error = ERPCMISMATCH; break; case RPC_AUTHERR: /* .re_status = RPC_AUTHERROR; */ error = EAUTH; break; default: /* unexpected */ error = EBADRPC; break; } goto out; } /* Did the call succeed? */ if (reply->rp_status != 0) { /* Note: This is NOT an error code! */ error = fxdr_unsigned(u_int32_t, reply->rp_status); switch (error) { case RPC_PROGUNAVAIL: error = EPROGUNAVAIL; break; case RPC_PROGMISMATCH: error = EPROGMISMATCH; break; case RPC_PROCUNAVAIL: error = EPROCUNAVAIL; break; case RPC_GARBAGE: default: error = EBADRPC; } goto out; } /* * OK, we have received a good reply! * Get its length, then strip it off. */ len = sizeof(*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 && error == 0) { *from_p = from; from = NULL; } out: m_freem(mhead); m_freem(from); 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) { m_clget(m, M_WAIT); if ((m->m_flags & M_EXT) == 0) { (void) m_free(m); /* There can be only one. */ return (NULL); } } xs = mtod(m, struct xdr_string *); m->m_len = mlen; xs->len = txdr_unsigned(len); memcpy(xs->data, str, len); return (m); } struct mbuf * xdr_string_decode(struct mbuf *m, char *str, int *len_p) /* len_p: bufsize - 1 */ { struct xdr_string *xs; int mlen; /* message length */ int slen; /* string length */ if (m->m_len < 4) { m = m_pullup(m, 4); if (m == NULL) return (NULL); } xs = mtod(m, struct xdr_string *); slen = fxdr_unsigned(u_int32_t, xs->len); mlen = 4 + ((slen + 3) & ~3); if (slen > *len_p) slen = *len_p; m_copydata(m, 4, slen, str); m_adj(m, mlen); str[slen] = '\0'; *len_p = slen; return (m); } /* * Inet address in RPC messages * (Note, really four ints, NOT chars. Blech.) */ struct xdr_inaddr { u_int32_t atype; u_int32_t addr[4]; }; struct mbuf * xdr_inaddr_encode(struct in_addr *ia) /* ia: already in network order */ { struct mbuf *m; struct xdr_inaddr *xi; u_int8_t *cp; u_int32_t *ip; m = m_get(M_WAIT, MT_DATA); xi = mtod(m, struct xdr_inaddr *); m->m_len = sizeof(*xi); xi->atype = txdr_unsigned(1); ip = xi->addr; cp = (u_int8_t *)&ia->s_addr; *ip++ = txdr_unsigned(*cp++); *ip++ = txdr_unsigned(*cp++); *ip++ = txdr_unsigned(*cp++); *ip++ = txdr_unsigned(*cp++); return (m); } struct mbuf * xdr_inaddr_decode(struct mbuf *m, struct in_addr *ia) /* ia: already in network order */ { struct xdr_inaddr *xi; u_int8_t *cp; u_int32_t *ip; if (m->m_len < sizeof(*xi)) { m = m_pullup(m, sizeof(*xi)); if (m == NULL) return (NULL); } xi = mtod(m, struct xdr_inaddr *); if (xi->atype != txdr_unsigned(1)) { ia->s_addr = INADDR_ANY; goto out; } ip = xi->addr; cp = (u_int8_t *)&ia->s_addr; *cp++ = fxdr_unsigned(u_int8_t, *ip++); *cp++ = fxdr_unsigned(u_int8_t, *ip++); *cp++ = fxdr_unsigned(u_int8_t, *ip++); *cp++ = fxdr_unsigned(u_int8_t, *ip++); out: m_adj(m, sizeof(*xi)); return (m); }