1 /* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ */
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35 /* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
41 * Simplified front end to rpc.
45 * This interface creates a virtual listener for all the services
46 * started thru rpc_reg(). It listens on the same endpoint for
47 * all the services and then executes the corresponding service
48 * for the given prognum and procnum.
51 #include "namespace.h"
52 #include "reentrant.h"
53 #include <sys/types.h>
55 #include <rpc/nettype.h>
60 #include "un-namespace.h"
65 static void universal(struct svc_req *, SVCXPRT *);
67 static struct proglst {
68 char *(*p_progname)(char *);
76 xdrproc_t p_inproc, p_outproc;
77 struct proglst *p_nxt;
80 static const char rpc_reg_err[] = "%s: %s";
81 static const char rpc_reg_msg[] = "rpc_reg: ";
82 static const char __reg_err1[] = "can't find appropriate transport";
83 static const char __reg_err2[] = "can't get protocol info";
84 static const char __reg_err3[] = "unsupported transport size";
85 static const char __no_mem_str[] = "out of memory";
88 * For simplified, easy to use kind of rpc interfaces.
89 * nettype indicates the type of transport on which the service will be
90 * listening. Used for conservation of the system resource. Only one
91 * handle is created for all the services (actually one of each netid)
92 * and same xdrbuf is used for same netid. The size of the arguments
93 * is also limited by the recvsize for that transport, even if it is
94 * a COTS transport. This may be wrong, but for cases like these, they
95 * should not use the simplified interfaces like this.
99 rpc_reg(prognum, versnum, procnum, progname, inproc, outproc, nettype)
100 rpcprog_t prognum; /* program number */
101 rpcvers_t versnum; /* version number */
102 rpcproc_t procnum; /* procedure number */
103 char *(*progname)(char *); /* Server routine */
104 xdrproc_t inproc, outproc; /* in/out XDR procedures */
105 char *nettype; /* nettype */
107 struct netconfig *nconf;
112 if (procnum == NULLPROC) {
113 warnx("%s can't reassign procedure number %u", rpc_reg_msg,
119 nettype = "netpath"; /* The default behavior */
120 if ((handle = __rpc_setconf(nettype)) == NULL) {
121 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1);
124 /* VARIABLES PROTECTED BY proglst_lock: proglst */
125 mutex_lock(&proglst_lock);
126 while ((nconf = __rpc_getconf(handle)) != NULL) {
137 xdrbuf = netid = NULL;
138 for (pl = proglst; pl; pl = pl->p_nxt) {
139 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) {
140 svcxprt = pl->p_transp;
141 xdrbuf = pl->p_xdrbuf;
142 recvsz = pl->p_recvsz;
148 if (svcxprt == NULL) {
149 struct __rpc_sockinfo si;
151 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
154 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) {
155 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2);
156 SVC_DESTROY(svcxprt);
159 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0);
161 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3);
162 SVC_DESTROY(svcxprt);
165 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) ||
166 ((netid = strdup(nconf->nc_netid)) == NULL)) {
167 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
172 SVC_DESTROY(svcxprt);
178 * Check if this (program, version, netid) had already been
179 * registered. The check may save a few RPC calls to rpcbind
181 for (pl = proglst; pl; pl = pl->p_nxt)
182 if ((pl->p_prognum == prognum) &&
183 (pl->p_versnum == versnum) &&
184 (strcmp(pl->p_netid, netid) == 0))
186 if (pl == NULL) { /* Not yet */
187 (void) rpcb_unset(prognum, versnum, nconf);
189 /* so that svc_reg does not call rpcb_set() */
193 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) {
194 warnx("%s couldn't register prog %u vers %u for %s",
195 rpc_reg_msg, (unsigned)prognum,
196 (unsigned)versnum, netid);
198 SVC_DESTROY(svcxprt);
205 pl = malloc(sizeof (struct proglst));
207 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
209 SVC_DESTROY(svcxprt);
215 pl->p_progname = progname;
216 pl->p_prognum = prognum;
217 pl->p_versnum = versnum;
218 pl->p_procnum = procnum;
219 pl->p_inproc = inproc;
220 pl->p_outproc = outproc;
221 pl->p_transp = svcxprt;
222 pl->p_xdrbuf = xdrbuf;
223 pl->p_recvsz = recvsz;
229 __rpc_endconf(handle);
230 mutex_unlock(&proglst_lock);
233 warnx("%s cant find suitable transport for %s",
234 rpc_reg_msg, nettype);
241 * The universal handler for the services registered using registerrpc.
242 * It handles both the connectionless and the connection oriented cases.
246 universal(rqstp, transp)
247 struct svc_req *rqstp;
258 * enforce "procnum 0 is echo" convention
260 if (rqstp->rq_proc == NULLPROC) {
261 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) ==
263 warnx("svc_sendreply failed");
267 prog = rqstp->rq_prog;
268 vers = rqstp->rq_vers;
269 proc = rqstp->rq_proc;
270 mutex_lock(&proglst_lock);
271 for (pl = proglst; pl; pl = pl->p_nxt)
272 if (pl->p_prognum == prog && pl->p_procnum == proc &&
273 pl->p_versnum == vers &&
274 (strcmp(pl->p_netid, transp->xp_netid) == 0)) {
275 /* decode arguments into a CLEAN buffer */
276 xdrbuf = pl->p_xdrbuf;
277 /* Zero the arguments: reqd ! */
278 (void) memset(xdrbuf, 0, sizeof (pl->p_recvsz));
280 * Assuming that sizeof (xdrbuf) would be enough
281 * for the arguments; if not then the program
284 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
285 svcerr_decode(transp);
286 mutex_unlock(&proglst_lock);
289 outdata = (*(pl->p_progname))(xdrbuf);
290 if (outdata == NULL &&
291 pl->p_outproc != (xdrproc_t) xdr_void){
292 /* there was an error */
293 mutex_unlock(&proglst_lock);
296 if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
298 "rpc: rpc_reg trouble replying to prog %u vers %u",
299 (unsigned)prog, (unsigned)vers);
300 mutex_unlock(&proglst_lock);
303 /* free the decoded arguments */
304 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf);
305 mutex_unlock(&proglst_lock);
308 mutex_unlock(&proglst_lock);
309 /* This should never happen */
310 warnx("rpc: rpc_reg: never registered prog %u vers %u",
311 (unsigned)prog, (unsigned)vers);