/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ #if defined(LIBC_SCCS) && !defined(lint) static char *rcsid = "$OpenBSD: svc_tcp.c,v 1.15 1997/07/09 03:05:05 deraadt Exp $"; #endif /* LIBC_SCCS and not lint */ /* * svc_tcp.c, Server side for TCP/IP based RPC. * * Copyright (C) 1984, Sun Microsystems, Inc. * * Actually implements two flavors of transporter - * a tcp rendezvouser (a listner and connection establisher) * and a record/tcp stream. */ #include #include #include #include #include #include #include #include #include #include #include /* * Ops vector for TCP/IP based rpc service handle */ static bool_t svctcp_recv(); static enum xprt_stat svctcp_stat(); static bool_t svctcp_getargs(); static bool_t svctcp_reply(); static bool_t svctcp_freeargs(); static void svctcp_destroy(); static struct xp_ops svctcp_op = { svctcp_recv, svctcp_stat, svctcp_getargs, svctcp_reply, svctcp_freeargs, svctcp_destroy }; /* * Ops vector for TCP/IP rendezvous handler */ static bool_t rendezvous_request(); static enum xprt_stat rendezvous_stat(); static struct xp_ops svctcp_rendezvous_op = { rendezvous_request, rendezvous_stat, (bool_t (*)())abort, (bool_t (*)())abort, (bool_t (*)())abort, svctcp_destroy }; static int readtcp(), writetcp(); static SVCXPRT *makefd_xprt(); struct tcp_rendezvous { /* kept in xprt->xp_p1 */ u_int sendsize; u_int recvsize; }; struct tcp_conn { /* kept in xprt->xp_p1 */ enum xprt_stat strm_stat; u_long x_id; XDR xdrs; char verf_body[MAX_AUTH_BYTES]; }; /* * Usage: * xprt = svctcp_create(sock, send_buf_size, recv_buf_size); * * Creates, registers, and returns a (rpc) tcp based transporter. * Once *xprt is initialized, it is registered as a transporter * see (svc.h, xprt_register). This routine returns * a NULL if a problem occurred. * * If sock<0 then a socket is created, else sock is used. * If the socket, sock is not bound to a port then svctcp_create * binds it to an arbitrary port. The routine then starts a tcp * listener on the socket's associated port. In any (successful) case, * xprt->xp_sock is the registered socket number and xprt->xp_port is the * associated port number. * * Since tcp streams do buffered io similar to stdio, the caller can specify * how big the send and receive buffers are via the second and third parms; * 0 => use the system default. */ SVCXPRT * svctcp_create(sock, sendsize, recvsize) register int sock; u_int sendsize; u_int recvsize; { bool_t madesock = FALSE; register SVCXPRT *xprt; register struct tcp_rendezvous *r; struct sockaddr_in addr; int len = sizeof(struct sockaddr_in); if (sock == RPC_ANYSOCK) { if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { perror("svctcp_.c - udp socket creation problem"); return ((SVCXPRT *)NULL); } madesock = TRUE; } memset(&addr, 0, sizeof (addr)); addr.sin_len = sizeof(struct sockaddr_in); addr.sin_family = AF_INET; if (bindresvport(sock, &addr)) { addr.sin_port = 0; (void)bind(sock, (struct sockaddr *)&addr, len); } if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) || (listen(sock, 2) != 0)) { perror("svctcp_.c - cannot getsockname or listen"); if (madesock) (void)close(sock); return ((SVCXPRT *)NULL); } r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r)); if (r == NULL) { (void)fprintf(stderr, "svctcp_create: out of memory\n"); if (madesock) (void)close(sock); return (NULL); } r->sendsize = sendsize; r->recvsize = recvsize; xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); if (xprt == NULL) { (void)fprintf(stderr, "svctcp_create: out of memory\n"); if (madesock) (void)close(sock); free(r); return (NULL); } xprt->xp_p2 = NULL; xprt->xp_p1 = (caddr_t)r; xprt->xp_verf = _null_auth; xprt->xp_ops = &svctcp_rendezvous_op; xprt->xp_port = ntohs(addr.sin_port); xprt->xp_sock = sock; xprt_register(xprt); return (xprt); } /* * Like svtcp_create(), except the routine takes any *open* UNIX file * descriptor as its first input. */ SVCXPRT * svcfd_create(fd, sendsize, recvsize) int fd; u_int sendsize; u_int recvsize; { return (makefd_xprt(fd, sendsize, recvsize)); } static SVCXPRT * makefd_xprt(fd, sendsize, recvsize) int fd; u_int sendsize; u_int recvsize; { register SVCXPRT *xprt; register struct tcp_conn *cd; xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); if (xprt == (SVCXPRT *)NULL) { (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); goto done; } cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn)); if (cd == (struct tcp_conn *)NULL) { (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); mem_free((char *) xprt, sizeof(SVCXPRT)); xprt = (SVCXPRT *)NULL; goto done; } cd->strm_stat = XPRT_IDLE; xdrrec_create(&(cd->xdrs), sendsize, recvsize, (caddr_t)xprt, readtcp, writetcp); xprt->xp_p2 = NULL; xprt->xp_p1 = (caddr_t)cd; xprt->xp_verf.oa_base = cd->verf_body; xprt->xp_addrlen = 0; xprt->xp_ops = &svctcp_op; /* truely deals with calls */ xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ xprt->xp_sock = fd; xprt_register(xprt); done: return (xprt); } static bool_t rendezvous_request(xprt) register SVCXPRT *xprt; { int sock; struct tcp_rendezvous *r; struct sockaddr_in addr; int len; r = (struct tcp_rendezvous *)xprt->xp_p1; again: len = sizeof(struct sockaddr_in); if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr, &len)) < 0) { if (errno == EINTR) goto again; return (FALSE); } #ifdef IP_OPTIONS { struct ipoption opts; int optsize = sizeof(opts), i; if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts, &optsize) && optsize != 0) { for (i = 0; (char *)&opts.ipopt_list[i] - (char *)&opts < optsize; ) { u_char c = (u_char)opts.ipopt_list[i]; if (c == IPOPT_LSRR || c == IPOPT_SSRR) { close(sock); return (FALSE); } if (c == IPOPT_EOL) break; i += (c == IPOPT_NOP) ? 1 : (u_char)opts.ipopt_list[i+1]; } } } #endif /* * XXX careful for ftp bounce attacks. If discovered, close the * socket and look for another connection. */ if (addr.sin_port == htons(20)) { close(sock); return (FALSE); } /* * make a new transporter (re-uses xprt) */ xprt = makefd_xprt(sock, r->sendsize, r->recvsize); xprt->xp_raddr = addr; xprt->xp_addrlen = len; return (FALSE); /* there is never an rpc msg to be processed */ } static enum xprt_stat rendezvous_stat() { return (XPRT_IDLE); } static void svctcp_destroy(xprt) register SVCXPRT *xprt; { register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1; xprt_unregister(xprt); if (xprt->xp_sock != -1) (void)close(xprt->xp_sock); xprt->xp_sock = -1; if (xprt->xp_port != 0) { /* a rendezvouser socket */ xprt->xp_port = 0; } else { /* an actual connection socket */ XDR_DESTROY(&(cd->xdrs)); } mem_free((caddr_t)cd, sizeof(struct tcp_conn)); mem_free((caddr_t)xprt, sizeof(SVCXPRT)); } /* * All read operations timeout after 35 seconds. * A timeout is fatal for the connection. */ static struct timeval wait_per_try = { 35, 0 }; /* * reads data from the tcp conection. * any error is fatal and the connection is closed. * (And a read of zero bytes is a half closed stream => error.) */ static int readtcp(xprt, buf, len) register SVCXPRT *xprt; caddr_t buf; register int len; { register int sock = xprt->xp_sock; struct timeval start, delta; struct timeval tmp1, tmp2; fd_set *fds, readfds; if (sock+1 > FD_SETSIZE) { int bytes = howmany(sock+1, NFDBITS) * sizeof(fd_mask); fds = (fd_set *)malloc(bytes); if (fds == NULL) goto fatal_err; memset(fds, 0, bytes); } else { fds = &readfds; FD_ZERO(fds); } delta = wait_per_try; gettimeofday(&start, NULL); do { /* XXX we know the other bits are still clear */ FD_SET(sock, fds); switch (select(sock+1, fds, NULL, NULL, &delta)) { case -1: if (errno != EINTR) goto fatal_err; gettimeofday(&tmp1, NULL); timersub(&tmp1, &start, &tmp2); timersub(&delta, &tmp2, &tmp1); if (tmp1.tv_sec < 0 || !timerisset(&tmp1)) goto fatal_err; delta = tmp1; continue; case 0: goto fatal_err; } } while (!FD_ISSET(sock, fds)); if ((len = read(sock, buf, len)) > 0) { if (fds != &readfds) free(fds); return (len); } fatal_err: ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; if (fds != &readfds) free(fds); return (-1); } /* * writes data to the tcp connection. * Any error is fatal and the connection is closed. */ static int writetcp(xprt, buf, len) register SVCXPRT *xprt; caddr_t buf; int len; { register int i, cnt; for (cnt = len; cnt > 0; cnt -= i, buf += i) { if ((i = write(xprt->xp_sock, buf, cnt)) < 0) { ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; return (-1); } } return (len); } static enum xprt_stat svctcp_stat(xprt) SVCXPRT *xprt; { register struct tcp_conn *cd = (struct tcp_conn *)(xprt->xp_p1); if (cd->strm_stat == XPRT_DIED) return (XPRT_DIED); if (! xdrrec_eof(&(cd->xdrs))) return (XPRT_MOREREQS); return (XPRT_IDLE); } static bool_t svctcp_recv(xprt, msg) SVCXPRT *xprt; register struct rpc_msg *msg; { register struct tcp_conn *cd = (struct tcp_conn *)(xprt->xp_p1); register XDR *xdrs = &(cd->xdrs); xdrs->x_op = XDR_DECODE; (void)xdrrec_skiprecord(xdrs); if (xdr_callmsg(xdrs, msg)) { cd->x_id = msg->rm_xid; return (TRUE); } return (FALSE); } static bool_t svctcp_getargs(xprt, xdr_args, args_ptr) SVCXPRT *xprt; xdrproc_t xdr_args; caddr_t args_ptr; { return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr)); } static bool_t svctcp_freeargs(xprt, xdr_args, args_ptr) SVCXPRT *xprt; xdrproc_t xdr_args; caddr_t args_ptr; { register XDR *xdrs = &(((struct tcp_conn *)(xprt->xp_p1))->xdrs); xdrs->x_op = XDR_FREE; return ((*xdr_args)(xdrs, args_ptr)); } static bool_t svctcp_reply(xprt, msg) SVCXPRT *xprt; register struct rpc_msg *msg; { register struct tcp_conn *cd = (struct tcp_conn *)(xprt->xp_p1); register XDR *xdrs = &(cd->xdrs); register bool_t stat; xdrs->x_op = XDR_ENCODE; msg->rm_xid = cd->x_id; stat = xdr_replymsg(xdrs, msg); (void)xdrrec_endofrecord(xdrs, TRUE); return (stat); }