--- /dev/null
+/*
+ * 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 1.18 1998/05/22 04:23:01 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <rpc/rpc.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#include <netinet/in_systm.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#ifndef __linux__
+#include <netinet/ip_var.h>
+#endif
+
+/*
+ * 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));
+#ifndef __linux__
+ addr.sin_len = sizeof(struct sockaddr_in);
+#endif
+ 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_auth = NULL;
+ 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_auth = NULL;
+ 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
+ {
+#ifdef __linux__
+#define ipopt_list ip_opts
+ struct ip_opts opts;
+#else
+ struct ipoption opts;
+#endif
+ 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));
+ }
+ if (xprt->xp_auth != NULL) {
+ SVCAUTH_DESTROY(xprt->xp_auth);
+ xprt->xp_auth = NULL;
+ }
+ 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 = NULL;
+ int prevbytes = 0, bytes;
+ extern int __svc_fdsetsize;
+ extern fd_set *__svc_fdset;
+
+ delta = wait_per_try;
+ gettimeofday(&start, NULL);
+ do {
+ bytes = howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask);
+ if (bytes != prevbytes) {
+ if (fds)
+ free(fds);
+ fds = (fd_set *)malloc(bytes);
+ prevbytes = bytes;
+ }
+ if (fds == NULL)
+ goto fatal_err;
+ memcpy(fds, __svc_fdset, bytes);
+
+ FD_SET(sock, fds);
+ switch (select(svc_maxfd+1, fds, NULL, NULL, &delta)) {
+ case -1:
+ if (errno != EINTR)
+ goto fatal_err;
+ gettimeofday(&tmp1, NULL);
+ timersub(&tmp1, &start, &tmp2);
+ timersub(&wait_per_try, &tmp2, &tmp1);
+ if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
+ goto fatal_err;
+ delta = tmp1;
+ continue;
+ case 0:
+ goto fatal_err;
+ default:
+ if (!FD_ISSET(sock, fds)) {
+ svc_getreqset2(fds, svc_maxfd+1);
+ gettimeofday(&tmp1, NULL);
+ timersub(&tmp1, &start, &tmp2);
+ timersub(&wait_per_try, &tmp2, &tmp1);
+ if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
+ goto fatal_err;
+ delta = tmp1;
+ continue;
+ }
+ }
+ } while (!FD_ISSET(sock, fds));
+ if ((len = read(sock, buf, len)) > 0) {
+ if (fds)
+ free(fds);
+ return (len);
+ }
+fatal_err:
+ ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
+ if (fds)
+ 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);
+ }
+ cd->strm_stat = XPRT_DIED; /* XXX */
+ return (FALSE);
+}
+
+static bool_t
+svctcp_getargs(xprt, xdr_args, args_ptr)
+ SVCXPRT *xprt;
+ xdrproc_t xdr_args;
+ caddr_t args_ptr;
+{
+ return (SVCAUTH_UNWRAP(xprt->xp_auth,
+ &(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
+ xdr_args, 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);
+ xdrproc_t xdr_proc;
+ caddr_t xdr_where;
+
+ xdrs->x_op = XDR_ENCODE;
+ msg->rm_xid = cd->x_id;
+
+ if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
+ msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
+ xdr_proc = msg->acpted_rply.ar_results.proc;
+ xdr_where = msg->acpted_rply.ar_results.where;
+ msg->acpted_rply.ar_results.proc = xdr_void;
+ msg->acpted_rply.ar_results.where = NULL;
+
+ if (!xdr_replymsg(xdrs, msg) ||
+ !SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_proc, xdr_where))
+ return (FALSE);
+ }
+ else if (!xdr_replymsg(xdrs, msg)) {
+ return (FALSE);
+ }
+ (void)xdrrec_endofrecord(xdrs, TRUE);
+
+ return (TRUE);
+}
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