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- /*
- * $Id: svc_tcp.c,v 4.2 1994/09/29 23:48:50 jraja Exp $
- *
- * Server side for TCP/IP based RPC.
- *
- * Copyright © 1994 AmiTCP/IP Group,
- * Network Solutions Development Inc.
- * All rights reserved.
- */
-
- /* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
- #if !defined(lint) && defined(SCCSIDS)
- static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
- #endif
-
- /*
- * 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 <sys/param.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <rpc/rpc.h>
- #include <sys/socket.h>
- #include <errno.h>
-
- /*
- * Ops vector for TCP/IP based rpc service handle
- */
- static bool_t svctcp_recv(SVCXPRT *xprt, struct rpc_msg *msg);
- static enum xprt_stat svctcp_stat(SVCXPRT *xprt);
- static bool_t svctcp_getargs(SVCXPRT *xprt, xdrproc_t xdr_args,
- void *args_ptr);
- static bool_t svctcp_reply(SVCXPRT *xprt, struct rpc_msg *msg);
- static bool_t svctcp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args,
- void *args_ptr);
- static void svctcp_destroy(SVCXPRT *xprt);
-
- 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(SVCXPRT *xprt,
- struct rpc_msg *notused);
- static bool_t rendezvous_illegal(SVCXPRT *xprt);
-
- static enum xprt_stat rendezvous_stat(SVCXPRT *xprt);
-
- static struct xp_ops svctcp_rendezvous_op = {
- rendezvous_request,
- rendezvous_stat,
- (int(*)(SVCXPRT *, xdrproc_t, void *))rendezvous_illegal,
- (int(*)(SVCXPRT *, struct rpc_msg *))rendezvous_illegal,
- (int(*)(SVCXPRT *, xdrproc_t, void *))rendezvous_illegal,
- svctcp_destroy
- };
-
- static int readtcp(SVCXPRT *xprt, caddr_t buf, int len),
- writetcp(SVCXPRT *xprt, caddr_t buf, int len);
- static SVCXPRT *makefd_xprt(int fd, u_int sendsize, u_int recvsize);
-
- 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;
- #ifdef AMITCP
- long len = sizeof(struct sockaddr_in);
- #else
- int len = sizeof(struct sockaddr_in);
- #endif
- 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;
- }
- bzero((char *)&addr, sizeof (addr));
- 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)
- #ifdef AMITCP
- (void)CloseSocket(sock);
- #else
- (void)close(sock);
- #endif
- return ((SVCXPRT *)NULL);
- }
- r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
- if (r == NULL) {
- (void) fprintf(stderr, "svctcp_create: out of memory\n");
- 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");
- 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);
- }
-
- #ifndef AMITCP
- /*
- * Like svctcp_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));
- }
- #endif
-
- static SVCXPRT *
- makefd_xprt(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,
- 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(register SVCXPRT *xprt, struct rpc_msg *notused)
- {
- int sock;
- struct tcp_rendezvous *r;
- struct sockaddr_in addr;
- #ifdef AMITCP
- long len;
- #else
- int len;
- #endif
-
- r = (struct tcp_rendezvous *)xprt->xp_p1;
- again:
- len = sizeof(struct sockaddr_in);
- if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
- &len)) < 0) {
- #ifndef AMITCP /* EINTR is returned in case of a CTRL-C by default */
- if (errno == EINTR)
- goto again;
- #endif
- 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(SVCXPRT *xprt)
- {
- return (XPRT_IDLE);
- }
-
- static bool_t
- rendezvous_illegal(SVCXPRT *xprt)
- {
- fprintf(stderr, "svc_tcp.c: tcp xprt not connected yet!");
- return FALSE;
- }
-
- static void
- svctcp_destroy(register SVCXPRT *xprt)
- {
- register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
-
- xprt_unregister(xprt);
- #ifdef AMITCP
- (void)CloseSocket(xprt->xp_sock);
- #else
- (void)close(xprt->xp_sock);
- #endif
- 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(register SVCXPRT *xprt, caddr_t buf, register int len)
- {
- register int sock = xprt->xp_sock;
- #ifdef FD_SETSIZE
- fd_set mask;
- fd_set readfds;
-
- FD_ZERO(&mask);
- FD_SET(sock, &mask);
- #else
- register int mask = 1 << sock;
- int readfds;
- #endif /* def FD_SETSIZE */
- do {
- readfds = mask;
- if (select(_rpc_dtablesize(), &readfds, NULL,
- NULL, &wait_per_try) <= 0) {
- #ifndef AMITCP /* EINTR is returned in case of a CTRL-C by default */
- if (errno == EINTR) {
- continue;
- }
- #endif
- goto fatal_err;
- }
- #ifdef FD_SETSIZE
- } while (!FD_ISSET(sock, &readfds));
- #else
- } while (readfds != mask);
- #endif /* def FD_SETSIZE */
- if ((len = recv(sock, buf, len, 0)) > 0) {
- return (len);
- }
- fatal_err:
- ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
- return (-1);
- }
-
- /*
- * writes data to the tcp connection.
- * Any error is fatal and the connection is closed.
- */
- static int
- writetcp(register SVCXPRT *xprt, caddr_t buf, int len)
- {
- register int i, cnt;
-
- for (cnt = len; cnt > 0; cnt -= i, buf += i) {
- if ((i = send(xprt->xp_sock, buf, cnt, 0)) < 0) {
- ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
- XPRT_DIED;
- return (-1);
- }
- }
- return (len);
- }
-
- static enum xprt_stat
- svctcp_stat(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(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(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
- {
- return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
- }
-
- static bool_t
- svctcp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *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(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);
- }
-