clnt_rc.c revision 177633
1/*- 2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3 * Authors: Doug Rabson <dfr@rabson.org> 4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/sys/rpc/clnt_rc.c 177633 2008-03-26 15:23:12Z dfr $"); 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/lock.h> 34#include <sys/malloc.h> 35#include <sys/mbuf.h> 36#include <sys/mutex.h> 37#include <sys/pcpu.h> 38#include <sys/proc.h> 39#include <sys/socket.h> 40#include <sys/socketvar.h> 41#include <sys/time.h> 42#include <sys/uio.h> 43 44#include <rpc/rpc.h> 45#include "rpc_com.h" 46 47static enum clnt_stat clnt_reconnect_call(CLIENT *, rpcproc_t, 48 xdrproc_t, void *, xdrproc_t, void *, struct timeval); 49static void clnt_reconnect_geterr(CLIENT *, struct rpc_err *); 50static bool_t clnt_reconnect_freeres(CLIENT *, xdrproc_t, void *); 51static void clnt_reconnect_abort(CLIENT *); 52static bool_t clnt_reconnect_control(CLIENT *, u_int, void *); 53static void clnt_reconnect_destroy(CLIENT *); 54 55static struct clnt_ops clnt_reconnect_ops = { 56 .cl_call = clnt_reconnect_call, 57 .cl_abort = clnt_reconnect_abort, 58 .cl_geterr = clnt_reconnect_geterr, 59 .cl_freeres = clnt_reconnect_freeres, 60 .cl_destroy = clnt_reconnect_destroy, 61 .cl_control = clnt_reconnect_control 62}; 63 64struct rc_data { 65 struct sockaddr_storage rc_addr; /* server address */ 66 struct netconfig* rc_nconf; /* network type */ 67 rpcprog_t rc_prog; /* program number */ 68 rpcvers_t rc_vers; /* version number */ 69 size_t rc_sendsz; 70 size_t rc_recvsz; 71 struct timeval rc_timeout; 72 struct timeval rc_retry; 73 const char *rc_waitchan; 74 int rc_intr; 75 CLIENT* rc_client; /* underlying RPC client */ 76}; 77 78CLIENT * 79clnt_reconnect_create( 80 struct netconfig *nconf, /* network type */ 81 struct sockaddr *svcaddr, /* servers address */ 82 rpcprog_t program, /* program number */ 83 rpcvers_t version, /* version number */ 84 size_t sendsz, /* buffer recv size */ 85 size_t recvsz) /* buffer send size */ 86{ 87 CLIENT *cl = NULL; /* client handle */ 88 struct rc_data *rc = NULL; /* private data */ 89 90 if (svcaddr == NULL) { 91 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 92 return (NULL); 93 } 94 95 cl = mem_alloc(sizeof (CLIENT)); 96 rc = mem_alloc(sizeof (*rc)); 97 (void) memcpy(&rc->rc_addr, svcaddr, (size_t)svcaddr->sa_len); 98 rc->rc_nconf = nconf; 99 rc->rc_prog = program; 100 rc->rc_vers = version; 101 rc->rc_sendsz = sendsz; 102 rc->rc_recvsz = recvsz; 103 rc->rc_timeout.tv_sec = -1; 104 rc->rc_timeout.tv_usec = -1; 105 rc->rc_retry.tv_sec = 15; 106 rc->rc_retry.tv_usec = 0; 107 rc->rc_waitchan = "rpcrecv"; 108 rc->rc_intr = 0; 109 rc->rc_client = NULL; 110 111 cl->cl_ops = &clnt_reconnect_ops; 112 cl->cl_private = (caddr_t)(void *)rc; 113 cl->cl_auth = authnone_create(); 114 cl->cl_tp = NULL; 115 cl->cl_netid = NULL; 116 return (cl); 117} 118 119static enum clnt_stat 120clnt_reconnect_connect(CLIENT *cl) 121{ 122 struct rc_data *rc = (struct rc_data *)cl->cl_private; 123 struct socket *so; 124 int one = 1; 125 126 so = __rpc_nconf2socket(rc->rc_nconf); 127 if (!so) { 128 rpc_createerr.cf_stat = RPC_TLIERROR; 129 rpc_createerr.cf_error.re_errno = 0; 130 return (RPC_TLIERROR); 131 } 132 133 if (rc->rc_nconf->nc_semantics == NC_TPI_CLTS) 134 rc->rc_client = clnt_dg_create(so, 135 (struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers, 136 rc->rc_sendsz, rc->rc_recvsz); 137 else 138 rc->rc_client = clnt_vc_create(so, 139 (struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers, 140 rc->rc_sendsz, rc->rc_recvsz); 141 142 CLNT_CONTROL(rc->rc_client, CLSET_FD_CLOSE, 0); 143 CLNT_CONTROL(rc->rc_client, CLSET_CONNECT, &one); 144 CLNT_CONTROL(rc->rc_client, CLSET_TIMEOUT, &rc->rc_timeout); 145 CLNT_CONTROL(rc->rc_client, CLSET_RETRY_TIMEOUT, &rc->rc_retry); 146 CLNT_CONTROL(rc->rc_client, CLSET_WAITCHAN, &rc->rc_waitchan); 147 CLNT_CONTROL(rc->rc_client, CLSET_INTERRUPTIBLE, &rc->rc_intr); 148 149 return (RPC_SUCCESS); 150} 151 152static enum clnt_stat 153clnt_reconnect_call( 154 CLIENT *cl, /* client handle */ 155 rpcproc_t proc, /* procedure number */ 156 xdrproc_t xargs, /* xdr routine for args */ 157 void *argsp, /* pointer to args */ 158 xdrproc_t xresults, /* xdr routine for results */ 159 void *resultsp, /* pointer to results */ 160 struct timeval utimeout) /* seconds to wait before giving up */ 161{ 162 struct rc_data *rc = (struct rc_data *)cl->cl_private; 163 enum clnt_stat stat; 164 165 do { 166 if (!rc->rc_client) 167 clnt_reconnect_connect(cl); 168 169 stat = CLNT_CALL(rc->rc_client, proc, xargs, argsp, 170 xresults, resultsp, utimeout); 171 172 if (stat == RPC_TIMEDOUT) { 173 /* 174 * Check for async send misfeature for NLM 175 * protocol. 176 */ 177 if ((rc->rc_timeout.tv_sec == 0 178 && rc->rc_timeout.tv_usec == 0) 179 || (rc->rc_timeout.tv_sec == -1 180 && utimeout.tv_sec == 0 181 && utimeout.tv_usec == 0)) 182 break; 183 } 184 185 if (stat == RPC_INTR) 186 break; 187 188 if (stat != RPC_SUCCESS) { 189 CLNT_DESTROY(rc->rc_client); 190 rc->rc_client = NULL; 191 } 192 } while (stat != RPC_SUCCESS); 193 194 return (stat); 195} 196 197static void 198clnt_reconnect_geterr(CLIENT *cl, struct rpc_err *errp) 199{ 200 struct rc_data *rc = (struct rc_data *)cl->cl_private; 201 202 if (rc->rc_client) 203 CLNT_GETERR(rc->rc_client, errp); 204 else 205 memset(errp, 0, sizeof(*errp)); 206} 207 208static bool_t 209clnt_reconnect_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 210{ 211 struct rc_data *rc = (struct rc_data *)cl->cl_private; 212 213 return (CLNT_FREERES(rc->rc_client, xdr_res, res_ptr)); 214} 215 216/*ARGSUSED*/ 217static void 218clnt_reconnect_abort(CLIENT *h) 219{ 220} 221 222static bool_t 223clnt_reconnect_control(CLIENT *cl, u_int request, void *info) 224{ 225 struct rc_data *rc = (struct rc_data *)cl->cl_private; 226 227 if (info == NULL) { 228 return (FALSE); 229 } 230 switch (request) { 231 case CLSET_TIMEOUT: 232 rc->rc_timeout = *(struct timeval *)info; 233 if (rc->rc_client) 234 CLNT_CONTROL(rc->rc_client, request, info); 235 break; 236 237 case CLGET_TIMEOUT: 238 *(struct timeval *)info = rc->rc_timeout; 239 break; 240 241 case CLSET_RETRY_TIMEOUT: 242 rc->rc_retry = *(struct timeval *)info; 243 if (rc->rc_client) 244 CLNT_CONTROL(rc->rc_client, request, info); 245 break; 246 247 case CLGET_RETRY_TIMEOUT: 248 *(struct timeval *)info = rc->rc_retry; 249 break; 250 251 case CLGET_VERS: 252 *(uint32_t *)info = rc->rc_vers; 253 break; 254 255 case CLSET_VERS: 256 rc->rc_vers = *(uint32_t *) info; 257 if (rc->rc_client) 258 CLNT_CONTROL(rc->rc_client, CLSET_VERS, info); 259 break; 260 261 case CLGET_PROG: 262 *(uint32_t *)info = rc->rc_prog; 263 break; 264 265 case CLSET_PROG: 266 rc->rc_prog = *(uint32_t *) info; 267 if (rc->rc_client) 268 CLNT_CONTROL(rc->rc_client, request, info); 269 break; 270 271 case CLSET_WAITCHAN: 272 rc->rc_waitchan = *(const char **)info; 273 if (rc->rc_client) 274 CLNT_CONTROL(rc->rc_client, request, info); 275 break; 276 277 case CLGET_WAITCHAN: 278 *(const char **) info = rc->rc_waitchan; 279 break; 280 281 case CLSET_INTERRUPTIBLE: 282 rc->rc_intr = *(int *) info; 283 if (rc->rc_client) 284 CLNT_CONTROL(rc->rc_client, request, info); 285 break; 286 287 case CLGET_INTERRUPTIBLE: 288 *(int *) info = rc->rc_intr; 289 break; 290 291 default: 292 return (FALSE); 293 } 294 295 return (TRUE); 296} 297 298static void 299clnt_reconnect_destroy(CLIENT *cl) 300{ 301 struct rc_data *rc = (struct rc_data *)cl->cl_private; 302 303 if (rc->rc_client) 304 CLNT_DESTROY(rc->rc_client); 305 mem_free(rc, sizeof(*rc)); 306 mem_free(cl, sizeof (CLIENT)); 307} 308