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 <rpc/rpc.h> 61 62 #include <rpc/rpc_com.h> 63 64 static enum xprt_stat svc_dg_stat(SVCXPRT *); 65 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *, 66 struct sockaddr **, struct mbuf **); 67 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *, 68 struct sockaddr *, struct mbuf *); 69 static void svc_dg_destroy(SVCXPRT *); 70 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 71 static void svc_dg_soupcall(struct socket *so, void *arg, int waitflag); 72 73 static struct xp_ops svc_dg_ops = { 74 .xp_recv = svc_dg_recv, 75 .xp_stat = svc_dg_stat, 76 .xp_reply = svc_dg_reply, 77 .xp_destroy = svc_dg_destroy, 78 .xp_control = svc_dg_control, 79 }; 80 81 /* 82 * Usage: 83 * xprt = svc_dg_create(sock, sendsize, recvsize); 84 * Does other connectionless specific initializations. 85 * Once *xprt is initialized, it is registered. 86 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 87 * system defaults are chosen. 88 * The routines returns NULL if a problem occurred. 89 */ 90 static const char svc_dg_str[] = "svc_dg_create: %s"; 91 static const char svc_dg_err1[] = "could not get transport information"; 92 static const char svc_dg_err2[] = "transport does not support data transfer"; 93 static const char __no_mem_str[] = "out of memory"; 94 95 SVCXPRT * 96 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 97 size_t recvsize) 98 { 99 SVCXPRT *xprt; 100 struct __rpc_sockinfo si; 101 struct sockaddr* sa; 102 int error; 103 104 if (!__rpc_socket2sockinfo(so, &si)) { 105 printf(svc_dg_str, svc_dg_err1); 106 return (NULL); 107 } 108 /* 109 * Find the receive and the send size 110 */ 111 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 112 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 113 if ((sendsize == 0) || (recvsize == 0)) { 114 printf(svc_dg_str, svc_dg_err2); 115 return (NULL); 116 } 117 118 xprt = svc_xprt_alloc(); 119 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 120 xprt->xp_pool = pool; 121 xprt->xp_socket = so; 122 xprt->xp_p1 = NULL; 123 xprt->xp_p2 = NULL; 124 xprt->xp_ops = &svc_dg_ops; 125 126 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 127 if (error) 128 goto freedata; 129 130 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 131 free(sa, M_SONAME); 132 133 xprt_register(xprt); 134 135 SOCKBUF_LOCK(&so->so_rcv); 136 so->so_upcallarg = xprt; 137 so->so_upcall = svc_dg_soupcall; 138 so->so_rcv.sb_flags |= SB_UPCALL; 139 SOCKBUF_UNLOCK(&so->so_rcv); 140 141 return (xprt); 142 freedata: 143 (void) printf(svc_dg_str, __no_mem_str); 144 if (xprt) { 145 svc_xprt_free(xprt); 146 } 147 return (NULL); 148 } 149 150 /*ARGSUSED*/ 151 static enum xprt_stat 152 svc_dg_stat(SVCXPRT *xprt) 153 { 154 155 if (soreadable(xprt->xp_socket)) 156 return (XPRT_MOREREQS); 157 158 return (XPRT_IDLE); 159 } 160 161 static bool_t 162 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg, 163 struct sockaddr **addrp, struct mbuf **mp) 164 { 165 struct uio uio; 166 struct sockaddr *raddr; 167 struct mbuf *mreq; 168 XDR xdrs; 169 int error, rcvflag; 170 171 /* 172 * Serialise access to the socket. 173 */ 174 sx_xlock(&xprt->xp_lock); 175 176 /* 177 * The socket upcall calls xprt_active() which will eventually 178 * cause the server to call us here. We attempt to read a 179 * packet from the socket and process it. If the read fails, 180 * we have drained all pending requests so we call 181 * xprt_inactive(). 182 */ 183 uio.uio_resid = 1000000000; 184 uio.uio_td = curthread; 185 mreq = NULL; 186 rcvflag = MSG_DONTWAIT; 187 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag); 188 189 if (error == EWOULDBLOCK) { 190 /* 191 * We must re-test for readability after taking the 192 * lock to protect us in the case where a new packet 193 * arrives on the socket after our call to soreceive 194 * fails with EWOULDBLOCK. The pool lock protects us 195 * from racing the upcall after our soreadable() call 196 * returns false. 197 */ 198 mtx_lock(&xprt->xp_pool->sp_lock); 199 if (!soreadable(xprt->xp_socket)) 200 xprt_inactive_locked(xprt); 201 mtx_unlock(&xprt->xp_pool->sp_lock); 202 sx_xunlock(&xprt->xp_lock); 203 return (FALSE); 204 } 205 206 if (error) { 207 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 208 xprt->xp_socket->so_upcallarg = NULL; 209 xprt->xp_socket->so_upcall = NULL; 210 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL; 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 MGETHDR(mrep, M_WAIT, MT_DATA); 242 mrep->m_len = 0; 243 244 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 245 246 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 247 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 248 if (!xdr_replymsg(&xdrs, msg)) 249 stat = FALSE; 250 else 251 xdrmbuf_append(&xdrs, m); 252 } else { 253 stat = xdr_replymsg(&xdrs, msg); 254 } 255 256 if (stat) { 257 m_fixhdr(mrep); 258 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL, 259 0, curthread); 260 if (!error) { 261 stat = TRUE; 262 } 263 } else { 264 m_freem(mrep); 265 } 266 267 XDR_DESTROY(&xdrs); 268 xprt->xp_p2 = NULL; 269 270 return (stat); 271 } 272 273 static void 274 svc_dg_destroy(SVCXPRT *xprt) 275 { 276 277 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 278 xprt->xp_socket->so_upcallarg = NULL; 279 xprt->xp_socket->so_upcall = NULL; 280 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL; 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 void 304 svc_dg_soupcall(struct socket *so, void *arg, int waitflag) 305 { 306 SVCXPRT *xprt = (SVCXPRT *) arg; 307 308 xprt_active(xprt); 309 } 310