1 /* $NetBSD: clnt_generic.c,v 1.18 2000/07/06 03:10:34 christos Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 /* #ident "@(#)clnt_generic.c 1.20 94/05/03 SMI" */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char *sccsid = "from: @(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";*/ 36 /*static char *sccsid = "from: @(#)clnt_generic.c 2.2 88/08/01 4.0 RPCSRC";*/ 37 static char *rcsid = "$FreeBSD$"; 38 #endif 39 40 /* 41 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 42 */ 43 #include "namespace.h" 44 #include "reentrant.h" 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <netinet/in.h> 48 #include <netinet/tcp.h> 49 #include <stdio.h> 50 #include <errno.h> 51 #include <netdb.h> 52 #include <rpc/rpc.h> 53 #include <rpc/nettype.h> 54 #include <string.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include "un-namespace.h" 58 #include "rpc_com.h" 59 60 /* 61 * Generic client creation with version checking the value of 62 * vers_out is set to the highest server supported value 63 * vers_low <= vers_out <= vers_high AND an error results 64 * if this can not be done. 65 */ 66 CLIENT * 67 clnt_create_vers(hostname, prog, vers_out, vers_low, vers_high, nettype) 68 const char *hostname; 69 rpcprog_t prog; 70 rpcvers_t *vers_out; 71 rpcvers_t vers_low; 72 rpcvers_t vers_high; 73 const char *nettype; 74 { 75 CLIENT *clnt; 76 struct timeval to; 77 enum clnt_stat rpc_stat; 78 struct rpc_err rpcerr; 79 80 clnt = clnt_create(hostname, prog, vers_high, nettype); 81 if (clnt == NULL) { 82 return (NULL); 83 } 84 to.tv_sec = 10; 85 to.tv_usec = 0; 86 rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, 87 (char *) NULL, (xdrproc_t) xdr_void, (char *) NULL, to); 88 if (rpc_stat == RPC_SUCCESS) { 89 *vers_out = vers_high; 90 return (clnt); 91 } 92 if (rpc_stat == RPC_PROGVERSMISMATCH) { 93 unsigned long minvers, maxvers; 94 95 clnt_geterr(clnt, &rpcerr); 96 minvers = rpcerr.re_vers.low; 97 maxvers = rpcerr.re_vers.high; 98 if (maxvers < vers_high) 99 vers_high = (rpcvers_t)maxvers; 100 if (minvers > vers_low) 101 vers_low = (rpcvers_t)minvers; 102 if (vers_low > vers_high) { 103 goto error; 104 } 105 CLNT_CONTROL(clnt, CLSET_VERS, (char *)(void *)&vers_high); 106 rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, 107 (char *) NULL, (xdrproc_t) xdr_void, 108 (char *) NULL, to); 109 if (rpc_stat == RPC_SUCCESS) { 110 *vers_out = vers_high; 111 return (clnt); 112 } 113 } 114 clnt_geterr(clnt, &rpcerr); 115 116 error: 117 rpc_createerr.cf_stat = rpc_stat; 118 rpc_createerr.cf_error = rpcerr; 119 clnt_destroy(clnt); 120 return (NULL); 121 } 122 123 /* 124 * Top level client creation routine. 125 * Generic client creation: takes (servers name, program-number, nettype) and 126 * returns client handle. Default options are set, which the user can 127 * change using the rpc equivalent of _ioctl()'s. 128 * 129 * It tries for all the netids in that particular class of netid until 130 * it succeeds. 131 * XXX The error message in the case of failure will be the one 132 * pertaining to the last create error. 133 * 134 * It calls clnt_tp_create(); 135 */ 136 CLIENT * 137 clnt_create(hostname, prog, vers, nettype) 138 const char *hostname; /* server name */ 139 rpcprog_t prog; /* program number */ 140 rpcvers_t vers; /* version number */ 141 const char *nettype; /* net type */ 142 { 143 struct netconfig *nconf; 144 CLIENT *clnt = NULL; 145 void *handle; 146 enum clnt_stat save_cf_stat = RPC_SUCCESS; 147 struct rpc_err save_cf_error; 148 149 150 if ((handle = __rpc_setconf(nettype)) == NULL) { 151 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 152 return (NULL); 153 } 154 rpc_createerr.cf_stat = RPC_SUCCESS; 155 while (clnt == NULL) { 156 if ((nconf = __rpc_getconf(handle)) == NULL) { 157 if (rpc_createerr.cf_stat == RPC_SUCCESS) 158 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 159 break; 160 } 161 #ifdef CLNT_DEBUG 162 printf("trying netid %s\n", nconf->nc_netid); 163 #endif 164 clnt = clnt_tp_create(hostname, prog, vers, nconf); 165 if (clnt) 166 break; 167 else 168 /* 169 * Since we didn't get a name-to-address 170 * translation failure here, we remember 171 * this particular error. The object of 172 * this is to enable us to return to the 173 * caller a more-specific error than the 174 * unhelpful ``Name to address translation 175 * failed'' which might well occur if we 176 * merely returned the last error (because 177 * the local loopbacks are typically the 178 * last ones in /etc/netconfig and the most 179 * likely to be unable to translate a host 180 * name). 181 */ 182 if (rpc_createerr.cf_stat != RPC_N2AXLATEFAILURE) { 183 save_cf_stat = rpc_createerr.cf_stat; 184 save_cf_error = rpc_createerr.cf_error; 185 } 186 } 187 188 /* 189 * Attempt to return an error more specific than ``Name to address 190 * translation failed'' 191 */ 192 if ((rpc_createerr.cf_stat == RPC_N2AXLATEFAILURE) && 193 (save_cf_stat != RPC_SUCCESS)) { 194 rpc_createerr.cf_stat = save_cf_stat; 195 rpc_createerr.cf_error = save_cf_error; 196 } 197 __rpc_endconf(handle); 198 return (clnt); 199 } 200 201 /* 202 * Generic client creation: takes (servers name, program-number, netconf) and 203 * returns client handle. Default options are set, which the user can 204 * change using the rpc equivalent of _ioctl()'s : clnt_control() 205 * It finds out the server address from rpcbind and calls clnt_tli_create() 206 */ 207 CLIENT * 208 clnt_tp_create(hostname, prog, vers, nconf) 209 const char *hostname; /* server name */ 210 rpcprog_t prog; /* program number */ 211 rpcvers_t vers; /* version number */ 212 const struct netconfig *nconf; /* net config struct */ 213 { 214 struct netbuf *svcaddr; /* servers address */ 215 CLIENT *cl = NULL; /* client handle */ 216 217 if (nconf == NULL) { 218 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 219 return (NULL); 220 } 221 222 /* 223 * Get the address of the server 224 */ 225 if ((svcaddr = __rpcb_findaddr(prog, vers, nconf, hostname, 226 &cl)) == NULL) { 227 /* appropriate error number is set by rpcbind libraries */ 228 return (NULL); 229 } 230 if (cl == NULL) { 231 cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr, 232 prog, vers, 0, 0); 233 } else { 234 /* Reuse the CLIENT handle and change the appropriate fields */ 235 if (CLNT_CONTROL(cl, CLSET_SVC_ADDR, (void *)svcaddr) == TRUE) { 236 if (cl->cl_netid == NULL) 237 cl->cl_netid = strdup(nconf->nc_netid); 238 if (cl->cl_tp == NULL) 239 cl->cl_tp = strdup(nconf->nc_device); 240 (void) CLNT_CONTROL(cl, CLSET_PROG, (void *)&prog); 241 (void) CLNT_CONTROL(cl, CLSET_VERS, (void *)&vers); 242 } else { 243 CLNT_DESTROY(cl); 244 cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr, 245 prog, vers, 0, 0); 246 } 247 } 248 free(svcaddr->buf); 249 free(svcaddr); 250 return (cl); 251 } 252 253 /* 254 * Generic client creation: returns client handle. 255 * Default options are set, which the user can 256 * change using the rpc equivalent of _ioctl()'s : clnt_control(). 257 * If fd is RPC_ANYFD, it will be opened using nconf. 258 * It will be bound if not so. 259 * If sizes are 0; appropriate defaults will be chosen. 260 */ 261 CLIENT * 262 clnt_tli_create(fd, nconf, svcaddr, prog, vers, sendsz, recvsz) 263 int fd; /* fd */ 264 const struct netconfig *nconf; /* netconfig structure */ 265 const struct netbuf *svcaddr; /* servers address */ 266 rpcprog_t prog; /* program number */ 267 rpcvers_t vers; /* version number */ 268 u_int sendsz; /* send size */ 269 u_int recvsz; /* recv size */ 270 { 271 CLIENT *cl; /* client handle */ 272 bool_t madefd = FALSE; /* whether fd opened here */ 273 long servtype; 274 int one = 1; 275 struct __rpc_sockinfo si; 276 277 if (fd == RPC_ANYFD) { 278 if (nconf == NULL) { 279 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 280 return (NULL); 281 } 282 283 fd = __rpc_nconf2fd(nconf); 284 285 if (fd == -1) 286 goto err; 287 288 madefd = TRUE; 289 servtype = nconf->nc_semantics; 290 if (!__rpc_fd2sockinfo(fd, &si)) 291 goto err; 292 293 bindresvport(fd, NULL); 294 } else { 295 if (!__rpc_fd2sockinfo(fd, &si)) 296 goto err; 297 servtype = __rpc_socktype2seman(si.si_socktype); 298 if (servtype == -1) { 299 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 300 return NULL; 301 } 302 303 } 304 305 if (si.si_af != ((struct sockaddr *)svcaddr->buf)->sa_family) { 306 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; /* XXX */ 307 goto err1; 308 } 309 310 switch (servtype) { 311 case NC_TPI_COTS_ORD: 312 cl = clnt_vc_create(fd, svcaddr, prog, vers, sendsz, recvsz); 313 if (!nconf || !cl) 314 break; 315 /* XXX fvdl - is this useful? */ 316 if (strncmp(nconf->nc_protofmly, "inet", 4) == 0) 317 _setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, 318 sizeof (one)); 319 break; 320 case NC_TPI_CLTS: 321 cl = clnt_dg_create(fd, svcaddr, prog, vers, sendsz, recvsz); 322 break; 323 default: 324 goto err; 325 } 326 327 if (cl == NULL) 328 goto err1; /* borrow errors from clnt_dg/vc creates */ 329 if (nconf) { 330 cl->cl_netid = strdup(nconf->nc_netid); 331 cl->cl_tp = strdup(nconf->nc_device); 332 } else { 333 cl->cl_netid = ""; 334 cl->cl_tp = ""; 335 } 336 if (madefd) { 337 (void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL); 338 /* (void) CLNT_CONTROL(cl, CLSET_POP_TIMOD, (char *) NULL); */ 339 }; 340 341 return (cl); 342 343 err: 344 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 345 rpc_createerr.cf_error.re_errno = errno; 346 err1: if (madefd) 347 (void)_close(fd); 348 return (NULL); 349 } 350