1 /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 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 /* 33 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI" 38 #endif 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 /* 43 * svc_dg.c, Server side for connectionless RPC. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/lock.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/mutex.h> 52 #include <sys/protosw.h> 53 #include <sys/queue.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/sx.h> 57 #include <sys/systm.h> 58 #include <sys/uio.h> 59 60 #include <net/vnet.h> 61 62 #include <rpc/rpc.h> 63 64 #include <rpc/rpc_com.h> 65 66 static enum xprt_stat svc_dg_stat(SVCXPRT *); 67 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *, 68 struct sockaddr **, struct mbuf **); 69 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *, 70 struct sockaddr *, struct mbuf *); 71 static void svc_dg_destroy(SVCXPRT *); 72 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 73 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag); 74 75 static struct xp_ops svc_dg_ops = { 76 .xp_recv = svc_dg_recv, 77 .xp_stat = svc_dg_stat, 78 .xp_reply = svc_dg_reply, 79 .xp_destroy = svc_dg_destroy, 80 .xp_control = svc_dg_control, 81 }; 82 83 /* 84 * Usage: 85 * xprt = svc_dg_create(sock, sendsize, recvsize); 86 * Does other connectionless specific initializations. 87 * Once *xprt is initialized, it is registered. 88 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 89 * system defaults are chosen. 90 * The routines returns NULL if a problem occurred. 91 */ 92 static const char svc_dg_str[] = "svc_dg_create: %s"; 93 static const char svc_dg_err1[] = "could not get transport information"; 94 static const char svc_dg_err2[] = "transport does not support data transfer"; 95 static const char __no_mem_str[] = "out of memory"; 96 97 SVCXPRT * 98 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 99 size_t recvsize) 100 { 101 SVCXPRT *xprt; 102 struct __rpc_sockinfo si; 103 struct sockaddr* sa; 104 int error; 105 106 CURVNET_SET(so->so_vnet); 107 if (!__rpc_socket2sockinfo(so, &si)) { 108 printf(svc_dg_str, svc_dg_err1); 109 CURVNET_RESTORE(); 110 return (NULL); 111 } 112 /* 113 * Find the receive and the send size 114 */ 115 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 116 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 117 if ((sendsize == 0) || (recvsize == 0)) { 118 printf(svc_dg_str, svc_dg_err2); 119 CURVNET_RESTORE(); 120 return (NULL); 121 } 122 123 xprt = svc_xprt_alloc(); 124 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 125 xprt->xp_pool = pool; 126 xprt->xp_socket = so; 127 xprt->xp_p1 = NULL; 128 xprt->xp_p2 = NULL; 129 xprt->xp_ops = &svc_dg_ops; 130 131 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 132 CURVNET_RESTORE(); 133 if (error) 134 goto freedata; 135 136 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 137 free(sa, M_SONAME); 138 139 xprt_register(xprt); 140 141 SOCKBUF_LOCK(&so->so_rcv); 142 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt); 143 SOCKBUF_UNLOCK(&so->so_rcv); 144 145 return (xprt); 146 freedata: 147 (void) printf(svc_dg_str, __no_mem_str); 148 if (xprt) { 149 svc_xprt_free(xprt); 150 } 151 return (NULL); 152 } 153 154 /*ARGSUSED*/ 155 static enum xprt_stat 156 svc_dg_stat(SVCXPRT *xprt) 157 { 158 159 if (soreadable(xprt->xp_socket)) 160 return (XPRT_MOREREQS); 161 162 return (XPRT_IDLE); 163 } 164 165 static bool_t 166 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg, 167 struct sockaddr **addrp, struct mbuf **mp) 168 { 169 struct uio uio; 170 struct sockaddr *raddr; 171 struct mbuf *mreq; 172 XDR xdrs; 173 int error, rcvflag; 174 175 /* 176 * Serialise access to the socket. 177 */ 178 sx_xlock(&xprt->xp_lock); 179 180 /* 181 * The socket upcall calls xprt_active() which will eventually 182 * cause the server to call us here. We attempt to read a 183 * packet from the socket and process it. If the read fails, 184 * we have drained all pending requests so we call 185 * xprt_inactive(). 186 */ 187 uio.uio_resid = 1000000000; 188 uio.uio_td = curthread; 189 mreq = NULL; 190 rcvflag = MSG_DONTWAIT; 191 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag); 192 193 if (error == EWOULDBLOCK) { 194 /* 195 * We must re-test for readability after taking the 196 * lock to protect us in the case where a new packet 197 * arrives on the socket after our call to soreceive 198 * fails with EWOULDBLOCK. The pool lock protects us 199 * from racing the upcall after our soreadable() call 200 * returns false. 201 */ 202 mtx_lock(&xprt->xp_pool->sp_lock); 203 if (!soreadable(xprt->xp_socket)) 204 xprt_inactive_locked(xprt); 205 mtx_unlock(&xprt->xp_pool->sp_lock); 206 sx_xunlock(&xprt->xp_lock); 207 return (FALSE); 208 } 209 210 if (error) { 211 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 212 soupcall_clear(xprt->xp_socket, SO_RCV); 213 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 214 xprt_inactive(xprt); 215 sx_xunlock(&xprt->xp_lock); 216 return (FALSE); 217 } 218 219 sx_xunlock(&xprt->xp_lock); 220 221 xdrmbuf_create(&xdrs, mreq, XDR_DECODE); 222 if (! xdr_callmsg(&xdrs, msg)) { 223 XDR_DESTROY(&xdrs); 224 return (FALSE); 225 } 226 227 *addrp = raddr; 228 *mp = xdrmbuf_getall(&xdrs); 229 XDR_DESTROY(&xdrs); 230 231 return (TRUE); 232 } 233 234 static bool_t 235 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg, 236 struct sockaddr *addr, struct mbuf *m) 237 { 238 XDR xdrs; 239 struct mbuf *mrep; 240 bool_t stat = TRUE; 241 int error; 242 243 MGETHDR(mrep, M_WAIT, MT_DATA); 244 mrep->m_len = 0; 245 246 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 247 248 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 249 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 250 if (!xdr_replymsg(&xdrs, msg)) 251 stat = FALSE; 252 else 253 xdrmbuf_append(&xdrs, m); 254 } else { 255 stat = xdr_replymsg(&xdrs, msg); 256 } 257 258 if (stat) { 259 m_fixhdr(mrep); 260 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL, 261 0, curthread); 262 if (!error) { 263 stat = TRUE; 264 } 265 } else { 266 m_freem(mrep); 267 } 268 269 XDR_DESTROY(&xdrs); 270 xprt->xp_p2 = NULL; 271 272 return (stat); 273 } 274 275 static void 276 svc_dg_destroy(SVCXPRT *xprt) 277 { 278 279 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 280 soupcall_clear(xprt->xp_socket, SO_RCV); 281 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 282 283 sx_destroy(&xprt->xp_lock); 284 if (xprt->xp_socket) 285 (void)soclose(xprt->xp_socket); 286 287 if (xprt->xp_netid) 288 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 289 svc_xprt_free(xprt); 290 } 291 292 static bool_t 293 /*ARGSUSED*/ 294 svc_dg_control(xprt, rq, in) 295 SVCXPRT *xprt; 296 const u_int rq; 297 void *in; 298 { 299 300 return (FALSE); 301 } 302 303 static int 304 svc_dg_soupcall(struct socket *so, void *arg, int waitflag) 305 { 306 SVCXPRT *xprt = (SVCXPRT *) arg; 307 308 xprt_active(xprt); 309 return (SU_OK); 310 } 311