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