clnt_rc.c revision 178112
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 178112 2008-04-11 10:34:59Z 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/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 if (!rc->rc_client) 143 return (rpc_createerr.cf_stat); 144 145 CLNT_CONTROL(rc->rc_client, CLSET_FD_CLOSE, 0); 146 CLNT_CONTROL(rc->rc_client, CLSET_CONNECT, &one); 147 CLNT_CONTROL(rc->rc_client, CLSET_TIMEOUT, &rc->rc_timeout); 148 CLNT_CONTROL(rc->rc_client, CLSET_RETRY_TIMEOUT, &rc->rc_retry); 149 CLNT_CONTROL(rc->rc_client, CLSET_WAITCHAN, &rc->rc_waitchan); 150 CLNT_CONTROL(rc->rc_client, CLSET_INTERRUPTIBLE, &rc->rc_intr); 151 152 return (RPC_SUCCESS); 153} 154 155static enum clnt_stat 156clnt_reconnect_call( 157 CLIENT *cl, /* client handle */ 158 rpcproc_t proc, /* procedure number */ 159 xdrproc_t xargs, /* xdr routine for args */ 160 void *argsp, /* pointer to args */ 161 xdrproc_t xresults, /* xdr routine for results */ 162 void *resultsp, /* pointer to results */ 163 struct timeval utimeout) /* seconds to wait before giving up */ 164{ 165 struct rc_data *rc = (struct rc_data *)cl->cl_private; 166 enum clnt_stat stat; 167 168 do { 169 if (!rc->rc_client) { 170 stat = clnt_reconnect_connect(cl); 171 if (stat != RPC_SUCCESS) 172 return (stat); 173 } 174 175 stat = CLNT_CALL(rc->rc_client, proc, xargs, argsp, 176 xresults, resultsp, utimeout); 177 178 if (stat == RPC_TIMEDOUT) { 179 /* 180 * Check for async send misfeature for NLM 181 * protocol. 182 */ 183 if ((rc->rc_timeout.tv_sec == 0 184 && rc->rc_timeout.tv_usec == 0) 185 || (rc->rc_timeout.tv_sec == -1 186 && utimeout.tv_sec == 0 187 && utimeout.tv_usec == 0)) 188 break; 189 } 190 191 if (stat == RPC_INTR) 192 break; 193 194 if (stat != RPC_SUCCESS) { 195 CLNT_DESTROY(rc->rc_client); 196 rc->rc_client = NULL; 197 } 198 } while (stat != RPC_SUCCESS); 199 200 return (stat); 201} 202 203static void 204clnt_reconnect_geterr(CLIENT *cl, struct rpc_err *errp) 205{ 206 struct rc_data *rc = (struct rc_data *)cl->cl_private; 207 208 if (rc->rc_client) 209 CLNT_GETERR(rc->rc_client, errp); 210 else 211 memset(errp, 0, sizeof(*errp)); 212} 213 214static bool_t 215clnt_reconnect_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 216{ 217 struct rc_data *rc = (struct rc_data *)cl->cl_private; 218 219 return (CLNT_FREERES(rc->rc_client, xdr_res, res_ptr)); 220} 221 222/*ARGSUSED*/ 223static void 224clnt_reconnect_abort(CLIENT *h) 225{ 226} 227 228static bool_t 229clnt_reconnect_control(CLIENT *cl, u_int request, void *info) 230{ 231 struct rc_data *rc = (struct rc_data *)cl->cl_private; 232 233 if (info == NULL) { 234 return (FALSE); 235 } 236 switch (request) { 237 case CLSET_TIMEOUT: 238 rc->rc_timeout = *(struct timeval *)info; 239 if (rc->rc_client) 240 CLNT_CONTROL(rc->rc_client, request, info); 241 break; 242 243 case CLGET_TIMEOUT: 244 *(struct timeval *)info = rc->rc_timeout; 245 break; 246 247 case CLSET_RETRY_TIMEOUT: 248 rc->rc_retry = *(struct timeval *)info; 249 if (rc->rc_client) 250 CLNT_CONTROL(rc->rc_client, request, info); 251 break; 252 253 case CLGET_RETRY_TIMEOUT: 254 *(struct timeval *)info = rc->rc_retry; 255 break; 256 257 case CLGET_VERS: 258 *(uint32_t *)info = rc->rc_vers; 259 break; 260 261 case CLSET_VERS: 262 rc->rc_vers = *(uint32_t *) info; 263 if (rc->rc_client) 264 CLNT_CONTROL(rc->rc_client, CLSET_VERS, info); 265 break; 266 267 case CLGET_PROG: 268 *(uint32_t *)info = rc->rc_prog; 269 break; 270 271 case CLSET_PROG: 272 rc->rc_prog = *(uint32_t *) info; 273 if (rc->rc_client) 274 CLNT_CONTROL(rc->rc_client, request, info); 275 break; 276 277 case CLSET_WAITCHAN: 278 rc->rc_waitchan = *(const char **)info; 279 if (rc->rc_client) 280 CLNT_CONTROL(rc->rc_client, request, info); 281 break; 282 283 case CLGET_WAITCHAN: 284 *(const char **) info = rc->rc_waitchan; 285 break; 286 287 case CLSET_INTERRUPTIBLE: 288 rc->rc_intr = *(int *) info; 289 if (rc->rc_client) 290 CLNT_CONTROL(rc->rc_client, request, info); 291 break; 292 293 case CLGET_INTERRUPTIBLE: 294 *(int *) info = rc->rc_intr; 295 break; 296 297 default: 298 return (FALSE); 299 } 300 301 return (TRUE); 302} 303 304static void 305clnt_reconnect_destroy(CLIENT *cl) 306{ 307 struct rc_data *rc = (struct rc_data *)cl->cl_private; 308 309 if (rc->rc_client) 310 CLNT_DESTROY(rc->rc_client); 311 mem_free(rc, sizeof(*rc)); 312 mem_free(cl, sizeof (CLIENT)); 313} 314