/* * svc_tcp.c, Server side for TCP/IP based RPC. * * Copyright (c) 2010, Oracle America, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of the "Oracle America, Inc." nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Actually implements two flavors of transporter - * a tcp rendezvouser (a listener and connection establisher) * and a record/tcp stream. */ #include <stdio.h> #include <unistd.h> #include <string.h> #include <libintl.h> #include <rpc/rpc.h> #include <sys/socket.h> #include <sys/poll.h> #include <errno.h> #include <stdlib.h> #include <wchar.h> #include <libio/iolibio.h> /* * Ops vector for TCP/IP based rpc service handle */ static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *); static enum xprt_stat svctcp_stat (SVCXPRT *); static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t); static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *); static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t); static void svctcp_destroy (SVCXPRT *); static const 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 *, struct rpc_msg *); static enum xprt_stat rendezvous_stat (SVCXPRT *); static void svctcp_rendezvous_abort (void) __attribute__ ((__noreturn__)); /* This function makes sure abort() relocation goes through PLT and thus can be lazy bound. */ static void svctcp_rendezvous_abort (void) { abort (); }; static const struct xp_ops svctcp_rendezvous_op = { rendezvous_request, rendezvous_stat, (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort, (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort, (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort, svctcp_destroy }; static int readtcp (char*, char *, int); static int writetcp (char *, char *, int); static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function; 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 (int sock, u_int sendsize, u_int recvsize) { bool_t madesock = FALSE; SVCXPRT *xprt; struct tcp_rendezvous *r; struct sockaddr_in addr; socklen_t len = sizeof (struct sockaddr_in); if (sock == RPC_ANYSOCK) { if ((sock = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { perror (_("svc_tcp.c - tcp 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, SOMAXCONN) != 0)) { perror (_("svc_tcp.c - cannot getsockname or listen")); if (madesock) (void) __close (sock); return (SVCXPRT *) NULL; } r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r)); xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); if (r == NULL || xprt == NULL) { (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n")); mem_free (r, sizeof (*r)); mem_free (xprt, sizeof (SVCXPRT)); return NULL; } r->sendsize = sendsize; r->recvsize = recvsize; 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; } #ifdef EXPORT_RPC_SYMBOLS libc_hidden_def (svctcp_create) #else libc_hidden_nolink (svctcp_create, GLIBC_2_0) #endif /* * Like svtcp_create(), except the routine takes any *open* UNIX file * descriptor as its first input. */ SVCXPRT * svcfd_create (int fd, u_int sendsize, u_int recvsize) { return makefd_xprt (fd, sendsize, recvsize); } libc_hidden_nolink (svcfd_create, GLIBC_2_0) static SVCXPRT * internal_function makefd_xprt (int fd, u_int sendsize, u_int recvsize) { SVCXPRT *xprt; struct tcp_conn *cd; xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn)); if (xprt == (SVCXPRT *) NULL || cd == NULL) { (void) __fxprintf (NULL, "%s: %s", "svc_tcp: makefd_xprt", _("out of memory\n")); mem_free (xprt, sizeof (SVCXPRT)); mem_free (cd, sizeof (struct tcp_conn)); return NULL; } 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; /* truly deals with calls */ xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ xprt->xp_sock = fd; xprt_register (xprt); return xprt; } static bool_t rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg) { int sock; struct tcp_rendezvous *r; struct sockaddr_in addr; socklen_t 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; } /* * make a new transporter (re-uses xprt) */ xprt = makefd_xprt (sock, r->sendsize, r->recvsize); memcpy (&xprt->xp_raddr, &addr, sizeof (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 void svctcp_destroy (SVCXPRT *xprt) { struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1; xprt_unregister (xprt); (void) __close (xprt->xp_sock); 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)); } /* * reads data from the tcp connection. * any error is fatal and the connection is closed. * (And a read of zero bytes is a half closed stream => error.) */ static int readtcp (char *xprtptr, char *buf, int len) { SVCXPRT *xprt = (SVCXPRT *)xprtptr; int sock = xprt->xp_sock; int milliseconds = 35 * 1000; struct pollfd pollfd; do { pollfd.fd = sock; pollfd.events = POLLIN; switch (__poll (&pollfd, 1, milliseconds)) { case -1: if (errno == EINTR) continue; /*FALLTHROUGH*/ case 0: goto fatal_err; default: if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP) || (pollfd.revents & POLLNVAL)) goto fatal_err; break; } } while ((pollfd.revents & POLLIN) == 0); if ((len = __read (sock, buf, len)) > 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 (char *xprtptr, char * buf, int len) { SVCXPRT *xprt = (SVCXPRT *)xprtptr; 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 (SVCXPRT *xprt) { 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, struct rpc_msg *msg) { struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1); 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; /* XXXX */ return FALSE; } static bool_t svctcp_getargs (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 (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr) { 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, struct rpc_msg *msg) { struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1); XDR *xdrs = &(cd->xdrs); 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; }