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 if (!__rpc_socket2sockinfo(so, &si)) { 107 printf(svc_dg_str, svc_dg_err1); 108 return (NULL); 109 } 110 /* 111 * Find the receive and the send size 112 */ 113 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 114 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 115 if ((sendsize == 0) || (recvsize == 0)) { 116 printf(svc_dg_str, svc_dg_err2); 117 return (NULL); 118 } 119 120 xprt = svc_xprt_alloc(); 121 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 122 xprt->xp_pool = pool; 123 xprt->xp_socket = so; 124 xprt->xp_p1 = NULL; 125 xprt->xp_p2 = NULL; 126 xprt->xp_ops = &svc_dg_ops; 127 128 CURVNET_SET(so->so_vnet); 129 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 130 CURVNET_RESTORE(); 131 if (error) 132 goto freedata; 133 134 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 135 free(sa, M_SONAME); 136 137 xprt_register(xprt); 138 139 SOCKBUF_LOCK(&so->so_rcv); 140 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt); 141 SOCKBUF_UNLOCK(&so->so_rcv); 142 143 return (xprt); 144 freedata: 145 (void) printf(svc_dg_str, __no_mem_str); 146 if (xprt) { 147 svc_xprt_free(xprt); 148 } 149 return (NULL); 150 } 151 152 /*ARGSUSED*/ 153 static enum xprt_stat 154 svc_dg_stat(SVCXPRT *xprt) 155 { 156 157 if (soreadable(xprt->xp_socket)) 158 return (XPRT_MOREREQS); 159 160 return (XPRT_IDLE); 161 } 162 163 static bool_t 164 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg, 165 struct sockaddr **addrp, struct mbuf **mp) 166 { 167 struct uio uio; 168 struct sockaddr *raddr; 169 struct mbuf *mreq; 170 XDR xdrs; 171 int error, rcvflag; 172 173 /* 174 * Serialise access to the socket. 175 */ 176 sx_xlock(&xprt->xp_lock); 177 178 /* 179 * The socket upcall calls xprt_active() which will eventually 180 * cause the server to call us here. We attempt to read a 181 * packet from the socket and process it. If the read fails, 182 * we have drained all pending requests so we call 183 * xprt_inactive(). 184 */ 185 uio.uio_resid = 1000000000; 186 uio.uio_td = curthread; 187 mreq = NULL; 188 rcvflag = MSG_DONTWAIT; 189 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag); 190 191 if (error == EWOULDBLOCK) { 192 /* 193 * We must re-test for readability after taking the 194 * lock to protect us in the case where a new packet 195 * arrives on the socket after our call to soreceive 196 * fails with EWOULDBLOCK. The pool lock protects us 197 * from racing the upcall after our soreadable() call 198 * returns false. 199 */ 200 mtx_lock(&xprt->xp_pool->sp_lock); 201 if (!soreadable(xprt->xp_socket)) 202 xprt_inactive_locked(xprt); 203 mtx_unlock(&xprt->xp_pool->sp_lock); 204 sx_xunlock(&xprt->xp_lock); 205 return (FALSE); 206 } 207 208 if (error) { 209 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 210 soupcall_clear(xprt->xp_socket, SO_RCV); 211 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 212 xprt_inactive(xprt); 213 sx_xunlock(&xprt->xp_lock); 214 return (FALSE); 215 } 216 217 sx_xunlock(&xprt->xp_lock); 218 219 xdrmbuf_create(&xdrs, mreq, XDR_DECODE); 220 if (! xdr_callmsg(&xdrs, msg)) { 221 XDR_DESTROY(&xdrs); 222 return (FALSE); 223 } 224 225 *addrp = raddr; 226 *mp = xdrmbuf_getall(&xdrs); 227 XDR_DESTROY(&xdrs); 228 229 return (TRUE); 230 } 231 232 static bool_t 233 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg, 234 struct sockaddr *addr, struct mbuf *m) 235 { 236 XDR xdrs; 237 struct mbuf *mrep; 238 bool_t stat = TRUE; 239 int error; 240 241 mrep = m_gethdr(M_WAITOK, MT_DATA); 242 243 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 244 245 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 246 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 247 if (!xdr_replymsg(&xdrs, msg)) 248 stat = FALSE; 249 else 250 xdrmbuf_append(&xdrs, m); 251 } else { 252 stat = xdr_replymsg(&xdrs, msg); 253 } 254 255 if (stat) { 256 m_fixhdr(mrep); 257 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL, 258 0, curthread); 259 if (!error) { 260 stat = TRUE; 261 } 262 } else { 263 m_freem(mrep); 264 } 265 266 XDR_DESTROY(&xdrs); 267 xprt->xp_p2 = NULL; 268 269 return (stat); 270 } 271 272 static void 273 svc_dg_destroy(SVCXPRT *xprt) 274 { 275 276 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 277 soupcall_clear(xprt->xp_socket, SO_RCV); 278 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 279 280 sx_destroy(&xprt->xp_lock); 281 if (xprt->xp_socket) 282 (void)soclose(xprt->xp_socket); 283 284 if (xprt->xp_netid) 285 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 286 svc_xprt_free(xprt); 287 } 288 289 static bool_t 290 /*ARGSUSED*/ 291 svc_dg_control(xprt, rq, in) 292 SVCXPRT *xprt; 293 const u_int rq; 294 void *in; 295 { 296 297 return (FALSE); 298 } 299 300 static int 301 svc_dg_soupcall(struct socket *so, void *arg, int waitflag) 302 { 303 SVCXPRT *xprt = (SVCXPRT *) arg; 304 305 xprt_active(xprt); 306 return (SU_OK); 307 } 308