ad133ed648
This concludes tonight's entertainment. Once I'm sure I haven't destroyed the world with all these changes, I'll import the utilities. Everything should continue to work as before. If it doesn't let me know. Special thanks to Mark Murray for running a test 'make world' for me to shake out the bugs, which, hopefully, I have fixed. (And there was much rejoicing.)
449 lines
11 KiB
C
449 lines
11 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/
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/*static char *sccsid = "from: @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";*/
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static char *rcsid = "$Id: svc_tcp.c,v 1.8 1996/12/30 15:19:08 peter Exp $";
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#endif
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/*
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* svc_tcp.c, Server side for TCP/IP based RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* Actually implements two flavors of transporter -
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* a tcp rendezvouser (a listner and connection establisher)
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* and a record/tcp stream.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <sys/socket.h>
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#include <errno.h>
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/*
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* Ops vector for TCP/IP based rpc service handle
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*/
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static bool_t svctcp_recv();
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static enum xprt_stat svctcp_stat();
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static bool_t svctcp_getargs();
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static bool_t svctcp_reply();
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static bool_t svctcp_freeargs();
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static void svctcp_destroy();
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static struct xp_ops svctcp_op = {
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svctcp_recv,
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svctcp_stat,
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svctcp_getargs,
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svctcp_reply,
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svctcp_freeargs,
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svctcp_destroy
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};
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/*
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* Ops vector for TCP/IP rendezvous handler
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*/
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static bool_t rendezvous_request();
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static enum xprt_stat rendezvous_stat();
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static struct xp_ops svctcp_rendezvous_op = {
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rendezvous_request,
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rendezvous_stat,
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(bool_t (*)())abort,
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(bool_t (*)())abort,
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(bool_t (*)())abort,
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svctcp_destroy
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};
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static int readtcp(), writetcp();
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static SVCXPRT *makefd_xprt();
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struct tcp_rendezvous { /* kept in xprt->xp_p1 */
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u_int sendsize;
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u_int recvsize;
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};
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struct tcp_conn { /* kept in xprt->xp_p1 */
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enum xprt_stat strm_stat;
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u_long x_id;
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XDR xdrs;
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char verf_body[MAX_AUTH_BYTES];
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};
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/*
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* Usage:
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* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
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*
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* Creates, registers, and returns a (rpc) tcp based transporter.
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* Once *xprt is initialized, it is registered as a transporter
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* see (svc.h, xprt_register). This routine returns
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* a NULL if a problem occurred.
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*
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* If sock<0 then a socket is created, else sock is used.
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* If the socket, sock is not bound to a port then svctcp_create
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* binds it to an arbitrary port. The routine then starts a tcp
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* listener on the socket's associated port. In any (successful) case,
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* xprt->xp_sock is the registered socket number and xprt->xp_port is the
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* associated port number.
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*
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* Since tcp streams do buffered io similar to stdio, the caller can specify
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* how big the send and receive buffers are via the second and third parms;
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* 0 => use the system default.
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*/
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SVCXPRT *
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svctcp_create(sock, sendsize, recvsize)
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register int sock;
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u_int sendsize;
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u_int recvsize;
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{
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bool_t madesock = FALSE;
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register SVCXPRT *xprt;
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register struct tcp_rendezvous *r;
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struct sockaddr_in addr;
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int len = sizeof(struct sockaddr_in);
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if (sock == RPC_ANYSOCK) {
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if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
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perror("svctcp_.c - udp socket creation problem");
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return ((SVCXPRT *)NULL);
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}
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madesock = TRUE;
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}
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memset(&addr, 0, sizeof (addr));
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addr.sin_len = sizeof(struct sockaddr_in);
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addr.sin_family = AF_INET;
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if (bindresvport(sock, &addr)) {
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addr.sin_port = 0;
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(void)bind(sock, (struct sockaddr *)&addr, len);
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}
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if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
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(listen(sock, 2) != 0)) {
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perror("svctcp_.c - cannot getsockname or listen");
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if (madesock)
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(void)close(sock);
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return ((SVCXPRT *)NULL);
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}
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r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
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if (r == NULL) {
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(void) fprintf(stderr, "svctcp_create: out of memory\n");
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return (NULL);
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}
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r->sendsize = sendsize;
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r->recvsize = recvsize;
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xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
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if (xprt == NULL) {
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(void) fprintf(stderr, "svctcp_create: out of memory\n");
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return (NULL);
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}
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t)r;
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xprt->xp_verf = _null_auth;
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xprt->xp_ops = &svctcp_rendezvous_op;
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xprt->xp_port = ntohs(addr.sin_port);
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xprt->xp_sock = sock;
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xprt_register(xprt);
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return (xprt);
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}
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/*
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* Like svtcp_create(), except the routine takes any *open* UNIX file
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* descriptor as its first input.
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*/
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SVCXPRT *
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svcfd_create(fd, sendsize, recvsize)
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int fd;
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u_int sendsize;
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u_int recvsize;
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{
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return (makefd_xprt(fd, sendsize, recvsize));
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}
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static SVCXPRT *
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makefd_xprt(fd, sendsize, recvsize)
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int fd;
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u_int sendsize;
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u_int recvsize;
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{
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register SVCXPRT *xprt;
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register struct tcp_conn *cd;
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xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
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if (xprt == (SVCXPRT *)NULL) {
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(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
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goto done;
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}
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cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
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if (cd == (struct tcp_conn *)NULL) {
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(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
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mem_free((char *) xprt, sizeof(SVCXPRT));
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xprt = (SVCXPRT *)NULL;
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goto done;
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}
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cd->strm_stat = XPRT_IDLE;
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xdrrec_create(&(cd->xdrs), sendsize, recvsize,
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(caddr_t)xprt, readtcp, writetcp);
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t)cd;
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xprt->xp_verf.oa_base = cd->verf_body;
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xprt->xp_addrlen = 0;
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xprt->xp_ops = &svctcp_op; /* truely deals with calls */
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xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
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xprt->xp_sock = fd;
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xprt_register(xprt);
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done:
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return (xprt);
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}
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static bool_t
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rendezvous_request(xprt)
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register SVCXPRT *xprt;
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{
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int sock;
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struct tcp_rendezvous *r;
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struct sockaddr_in addr;
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int len;
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r = (struct tcp_rendezvous *)xprt->xp_p1;
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again:
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len = sizeof(struct sockaddr_in);
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if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
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&len)) < 0) {
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if (errno == EINTR)
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goto again;
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return (FALSE);
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}
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/*
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* XXX careful for ftp bounce attacks. If discovered, close the
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* socket and look for another connection.
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*/
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if (addr.sin_port == htons(20)) {
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close(sock);
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goto again;
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}
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/*
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* make a new transporter (re-uses xprt)
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*/
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xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
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xprt->xp_raddr = addr;
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xprt->xp_addrlen = len;
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return (FALSE); /* there is never an rpc msg to be processed */
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}
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static enum xprt_stat
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rendezvous_stat()
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{
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return (XPRT_IDLE);
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}
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static void
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svctcp_destroy(xprt)
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register SVCXPRT *xprt;
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{
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register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
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xprt_unregister(xprt);
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(void)close(xprt->xp_sock);
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if (xprt->xp_port != 0) {
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/* a rendezvouser socket */
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xprt->xp_port = 0;
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} else {
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/* an actual connection socket */
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XDR_DESTROY(&(cd->xdrs));
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}
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mem_free((caddr_t)cd, sizeof(struct tcp_conn));
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mem_free((caddr_t)xprt, sizeof(SVCXPRT));
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}
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/*
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* All read operations timeout after 35 seconds.
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* A timeout is fatal for the connection.
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*/
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static struct timeval wait_per_try = { 35, 0 };
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/*
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* reads data from the tcp conection.
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* any error is fatal and the connection is closed.
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* (And a read of zero bytes is a half closed stream => error.)
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*/
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static int
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readtcp(xprt, buf, len)
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register SVCXPRT *xprt;
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caddr_t buf;
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register int len;
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{
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register int sock = xprt->xp_sock;
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struct timeval start, delta, tv;
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struct timeval tmp1, tmp2;
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fd_set *fds, readfds;
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if (sock + 1 > FD_SETSIZE) {
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int bytes = howmany(sock+1, NFDBITS) * sizeof(fd_mask);
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fds = (fd_set *)malloc(bytes);
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if (fds == NULL)
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goto fatal_err;
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memset(fds, 0, bytes);
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} else {
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fds = &readfds;
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FD_ZERO(fds);
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}
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delta = wait_per_try;
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gettimeofday(&start, NULL);
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do {
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/* XXX we know the other bits are still clear */
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FD_SET(sock, fds);
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tv = delta; /* in case select() implements writeback */
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switch (select(sock + 1, fds, NULL, NULL, &tv)) {
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case -1:
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if (errno != EINTR)
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goto fatal_err;
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gettimeofday(&tmp1, NULL);
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timersub(&tmp1, &start, &tmp2);
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timersub(&delta, &tmp2, &tmp1);
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if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
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goto fatal_err;
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delta = tmp1;
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continue;
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case 0:
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goto fatal_err;
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}
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} while (!FD_ISSET(sock, fds));
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if ((len = read(sock, buf, len)) > 0) {
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if (fds != &readfds)
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free(fds);
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return (len);
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}
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fatal_err:
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((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
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if (fds != &readfds)
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free(fds);
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return (-1);
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}
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/*
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* writes data to the tcp connection.
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* Any error is fatal and the connection is closed.
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*/
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static int
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writetcp(xprt, buf, len)
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register SVCXPRT *xprt;
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caddr_t buf;
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int len;
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{
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register int i, cnt;
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for (cnt = len; cnt > 0; cnt -= i, buf += i) {
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if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
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((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
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XPRT_DIED;
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return (-1);
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}
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}
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return (len);
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}
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static enum xprt_stat
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svctcp_stat(xprt)
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SVCXPRT *xprt;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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if (cd->strm_stat == XPRT_DIED)
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return (XPRT_DIED);
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if (! xdrrec_eof(&(cd->xdrs)))
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return (XPRT_MOREREQS);
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return (XPRT_IDLE);
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}
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static bool_t
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svctcp_recv(xprt, msg)
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SVCXPRT *xprt;
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register struct rpc_msg *msg;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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register XDR *xdrs = &(cd->xdrs);
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xdrs->x_op = XDR_DECODE;
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(void)xdrrec_skiprecord(xdrs);
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if (xdr_callmsg(xdrs, msg)) {
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cd->x_id = msg->rm_xid;
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return (TRUE);
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}
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return (FALSE);
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}
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static bool_t
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svctcp_getargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
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}
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static bool_t
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svctcp_freeargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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register XDR *xdrs =
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&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
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xdrs->x_op = XDR_FREE;
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return ((*xdr_args)(xdrs, args_ptr));
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}
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static bool_t
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svctcp_reply(xprt, msg)
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SVCXPRT *xprt;
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register struct rpc_msg *msg;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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register XDR *xdrs = &(cd->xdrs);
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register bool_t stat;
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xdrs->x_op = XDR_ENCODE;
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msg->rm_xid = cd->x_id;
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stat = xdr_replymsg(xdrs, msg);
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(void)xdrrec_endofrecord(xdrs, TRUE);
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return (stat);
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}
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