/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ #if defined(LIBC_SCCS) && !defined(lint) static char *rcsid = "$OpenBSD: svc.c,v 1.11 1998/02/25 12:21:18 deraadt Exp $"; #endif /* LIBC_SCCS and not lint */ /* * svc.c, Server-side remote procedure call interface. * * There are two sets of procedures here. The xprt routines are * for handling transport handles. The svc routines handle the * list of service routines. * * Copyright (C) 1984, Sun Microsystems, Inc. */ #include #include #include #include #include static SVCXPRT **xports; static int xportssize; #define NULL_SVC ((struct svc_callout *)0) #define RQCRED_SIZE 400 /* this size is excessive */ #define max(a, b) (a > b ? a : b) /* * The services list * Each entry represents a set of procedures (an rpc program). * The dispatch routine takes request structs and runs the * apropriate procedure. */ static struct svc_callout { struct svc_callout *sc_next; u_long sc_prog; u_long sc_vers; void (*sc_dispatch)(); } *svc_head; static struct svc_callout *svc_find(); int __svc_fdsetsize; fd_set *__svc_fdset; /* *************** SVCXPRT related stuff **************** */ /* * Activate a transport handle. */ void xprt_register(xprt) SVCXPRT *xprt; { register int sock = xprt->xp_sock; if (sock+1 > __svc_fdsetsize) { int bytes = howmany(sock+1, NFDBITS) * sizeof(fd_mask); fd_set *fds; fds = (fd_set *)malloc(bytes); memset(fds, 0, bytes); if (__svc_fdset) { memcpy(fds, __svc_fdset, howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask)); free(__svc_fdset); } __svc_fdset = fds; __svc_fdsetsize = sock+1; } if (sock < FD_SETSIZE) FD_SET(sock, &svc_fdset); FD_SET(sock, __svc_fdset); if (xports == NULL || sock+1 > xportssize) { SVCXPRT **xp; int size = FD_SETSIZE; if (sock+1 > size) size = sock+1; xp = (SVCXPRT **)mem_alloc(size * sizeof(SVCXPRT *)); memset(xp, 0, size * sizeof(SVCXPRT *)); if (xports) { memcpy(xp, xports, xportssize * sizeof(SVCXPRT *)); free(xports); } xportssize = size; xports = xp; } xports[sock] = xprt; svc_maxfd = max(svc_maxfd, sock); } /* * De-activate a transport handle. */ void xprt_unregister(xprt) SVCXPRT *xprt; { register int sock = xprt->xp_sock; if (xports[sock] == xprt) { xports[sock] = (SVCXPRT *)0; if (sock < FD_SETSIZE) FD_CLR(sock, &svc_fdset); FD_CLR(sock, __svc_fdset); if (sock == svc_maxfd) { for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--) if (xports[svc_maxfd]) break; } /* * XXX could use svc_maxfd as a hint to * decrease the size of __svc_fdset */ } } /* ********************** CALLOUT list related stuff ************* */ /* * Add a service program to the callout list. * The dispatch routine will be called when a rpc request for this * program number comes in. */ bool_t svc_register(xprt, prog, vers, dispatch, protocol) SVCXPRT *xprt; u_long prog; u_long vers; void (*dispatch)(); int protocol; { struct svc_callout *prev; register struct svc_callout *s; if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) { if (s->sc_dispatch == dispatch) goto pmap_it; /* he is registering another xptr */ return (FALSE); } s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout)); if (s == (struct svc_callout *)0) { return (FALSE); } s->sc_prog = prog; s->sc_vers = vers; s->sc_dispatch = dispatch; s->sc_next = svc_head; svc_head = s; pmap_it: /* now register the information with the local binder service */ if (protocol) { return (pmap_set(prog, vers, protocol, xprt->xp_port)); } return (TRUE); } /* * Remove a service program from the callout list. */ void svc_unregister(prog, vers) u_long prog; u_long vers; { struct svc_callout *prev; register struct svc_callout *s; if ((s = svc_find(prog, vers, &prev)) == NULL_SVC) return; if (prev == NULL_SVC) { svc_head = s->sc_next; } else { prev->sc_next = s->sc_next; } s->sc_next = NULL_SVC; mem_free((char *) s, (u_int) sizeof(struct svc_callout)); /* now unregister the information with the local binder service */ (void)pmap_unset(prog, vers); } /* * Search the callout list for a program number, return the callout * struct. */ static struct svc_callout * svc_find(prog, vers, prev) u_long prog; u_long vers; struct svc_callout **prev; { register struct svc_callout *s, *p; p = NULL_SVC; for (s = svc_head; s != NULL_SVC; s = s->sc_next) { if ((s->sc_prog == prog) && (s->sc_vers == vers)) goto done; p = s; } done: *prev = p; return (s); } /* ******************* REPLY GENERATION ROUTINES ************ */ /* * Send a reply to an rpc request */ bool_t svc_sendreply(xprt, xdr_results, xdr_location) register SVCXPRT *xprt; xdrproc_t xdr_results; caddr_t xdr_location; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = SUCCESS; rply.acpted_rply.ar_results.where = xdr_location; rply.acpted_rply.ar_results.proc = xdr_results; return (SVC_REPLY(xprt, &rply)); } /* * No procedure error reply */ void svcerr_noproc(xprt) register SVCXPRT *xprt; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = PROC_UNAVAIL; SVC_REPLY(xprt, &rply); } /* * Can't decode args error reply */ void svcerr_decode(xprt) register SVCXPRT *xprt; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = GARBAGE_ARGS; SVC_REPLY(xprt, &rply); } /* * Some system error */ void svcerr_systemerr(xprt) register SVCXPRT *xprt; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = SYSTEM_ERR; SVC_REPLY(xprt, &rply); } /* * Authentication error reply */ void svcerr_auth(xprt, why) SVCXPRT *xprt; enum auth_stat why; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_DENIED; rply.rjcted_rply.rj_stat = AUTH_ERROR; rply.rjcted_rply.rj_why = why; SVC_REPLY(xprt, &rply); } /* * Auth too weak error reply */ void svcerr_weakauth(xprt) SVCXPRT *xprt; { svcerr_auth(xprt, AUTH_TOOWEAK); } /* * Program unavailable error reply */ void svcerr_noprog(xprt) register SVCXPRT *xprt; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = PROG_UNAVAIL; SVC_REPLY(xprt, &rply); } /* * Program version mismatch error reply */ void svcerr_progvers(xprt, low_vers, high_vers) register SVCXPRT *xprt; u_long low_vers; u_long high_vers; { struct rpc_msg rply; rply.rm_direction = REPLY; rply.rm_reply.rp_stat = MSG_ACCEPTED; rply.acpted_rply.ar_verf = xprt->xp_verf; rply.acpted_rply.ar_stat = PROG_MISMATCH; rply.acpted_rply.ar_vers.low = low_vers; rply.acpted_rply.ar_vers.high = high_vers; SVC_REPLY(xprt, &rply); } /* ******************* SERVER INPUT STUFF ******************* */ /* * Get server side input from some transport. * * Statement of authentication parameters management: * This function owns and manages all authentication parameters, specifically * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and * the "cooked" credentials (rqst->rq_clntcred). * However, this function does not know the structure of the cooked * credentials, so it make the following assumptions: * a) the structure is contiguous (no pointers), and * b) the cred structure size does not exceed RQCRED_SIZE bytes. * In all events, all three parameters are freed upon exit from this routine. * The storage is trivially management on the call stack in user land, but * is mallocated in kernel land. */ void svc_getreq(rdfds) int rdfds; { fd_set readfds; FD_ZERO(&readfds); readfds.fds_bits[0] = rdfds; svc_getreqset(&readfds); } void svc_getreqset2 __P((fd_set *, int)); void svc_getreqset(readfds) fd_set *readfds; { svc_getreqset2(readfds, FD_SETSIZE); } void svc_getreqset2(readfds, width) fd_set *readfds; int width; { enum xprt_stat stat; struct rpc_msg msg; int prog_found; u_long low_vers; u_long high_vers; struct svc_req r; register SVCXPRT *xprt; register int bit; register fd_mask mask, *maskp; register int sock; char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE]; msg.rm_call.cb_cred.oa_base = cred_area; msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]); r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]); maskp = readfds->fds_bits; for (sock = 0; sock < width; sock += NFDBITS) { for (mask = *maskp++; (bit = ffs(mask)); mask ^= (1 << (bit - 1))) { /* sock has input waiting */ xprt = xports[sock + bit - 1]; if (xprt == NULL) /* But do we control sock? */ continue; /* now receive msgs from xprtprt (support batch calls) */ do { if (SVC_RECV(xprt, &msg)) { /* now find the exported program and call it */ register struct svc_callout *s; enum auth_stat why; r.rq_xprt = xprt; r.rq_prog = msg.rm_call.cb_prog; r.rq_vers = msg.rm_call.cb_vers; r.rq_proc = msg.rm_call.cb_proc; r.rq_cred = msg.rm_call.cb_cred; /* first authenticate the message */ if ((why= _authenticate(&r, &msg)) != AUTH_OK) { svcerr_auth(xprt, why); goto call_done; } /* now match message with a registered service*/ prog_found = FALSE; low_vers = (u_long) -1; high_vers = 0; for (s = svc_head; s != NULL_SVC; s = s->sc_next) { if (s->sc_prog == r.rq_prog) { if (s->sc_vers == r.rq_vers) { (*s->sc_dispatch)(&r, xprt); goto call_done; } /* found correct version */ prog_found = TRUE; if (s->sc_vers < low_vers) low_vers = s->sc_vers; if (s->sc_vers > high_vers) high_vers = s->sc_vers; } /* found correct program */ } /* * if we got here, the program or version * is not served ... */ if (prog_found) svcerr_progvers(xprt, low_vers, high_vers); else svcerr_noprog(xprt); /* Fall through to ... */ } call_done: if ((stat = SVC_STAT(xprt)) == XPRT_DIED){ SVC_DESTROY(xprt); break; } } while (stat == XPRT_MOREREQS); } } }