diff options
Diffstat (limited to 'REORG.TODO/sunrpc/svc_unix.c')
| -rw-r--r-- | REORG.TODO/sunrpc/svc_unix.c | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/REORG.TODO/sunrpc/svc_unix.c b/REORG.TODO/sunrpc/svc_unix.c new file mode 100644 index 0000000000..a8da3b2262 --- /dev/null +++ b/REORG.TODO/sunrpc/svc_unix.c @@ -0,0 +1,537 @@ +/* + * svc_unix.c, Server side for TCP/IP based RPC. + * + * Copyright (C) 2012-2017 Free Software Foundation, Inc. + * This file is part of the GNU C Library. + * + * The GNU C Library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * The GNU C Library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with the GNU C Library; if not, see + * <http://www.gnu.org/licenses/>. + * + * 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 unix rendezvouser (a listener and connection establisher) + * and a record/unix stream. + */ + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <rpc/rpc.h> +#include <rpc/svc.h> +#include <sys/socket.h> +#include <sys/uio.h> +#include <sys/poll.h> +#include <errno.h> +#include <stdlib.h> +#include <libintl.h> +#include <wchar.h> +#include <shlib-compat.h> + +/* + * Ops vector for AF_UNIX based rpc service handle + */ +static bool_t svcunix_recv (SVCXPRT *, struct rpc_msg *); +static enum xprt_stat svcunix_stat (SVCXPRT *); +static bool_t svcunix_getargs (SVCXPRT *, xdrproc_t, caddr_t); +static bool_t svcunix_reply (SVCXPRT *, struct rpc_msg *); +static bool_t svcunix_freeargs (SVCXPRT *, xdrproc_t, caddr_t); +static void svcunix_destroy (SVCXPRT *); + +static const struct xp_ops svcunix_op = +{ + svcunix_recv, + svcunix_stat, + svcunix_getargs, + svcunix_reply, + svcunix_freeargs, + svcunix_destroy +}; + +/* + * Ops vector for AF_UNIX rendezvous handler + */ +static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *); +static enum xprt_stat rendezvous_stat (SVCXPRT *); +static void svcunix_rendezvous_abort (void) __attribute__ ((__noreturn__)); + +/* This function makes sure abort() relocation goes through PLT + and thus can be lazy bound. */ +static void +svcunix_rendezvous_abort (void) +{ + abort (); +}; + +static const struct xp_ops svcunix_rendezvous_op = +{ + rendezvous_request, + rendezvous_stat, + (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svcunix_rendezvous_abort, + (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svcunix_rendezvous_abort, + (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svcunix_rendezvous_abort, + svcunix_destroy +}; + +static int readunix (char*, char *, int); +static int writeunix (char *, char *, int); +static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function; + +struct unix_rendezvous { /* kept in xprt->xp_p1 */ + u_int sendsize; + u_int recvsize; +}; + +struct unix_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 = svcunix_create(sock, send_buf_size, recv_buf_size); + * + * Creates, registers, and returns a (rpc) unix 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 svcunix_create + * binds it to an arbitrary port. The routine then starts a unix + * 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 unix 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 * +svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path) +{ + bool_t madesock = FALSE; + SVCXPRT *xprt; + struct unix_rendezvous *r; + struct sockaddr_un addr; + socklen_t len = sizeof (struct sockaddr_in); + + if (sock == RPC_ANYSOCK) + { + if ((sock = __socket (AF_UNIX, SOCK_STREAM, 0)) < 0) + { + perror (_("svc_unix.c - AF_UNIX socket creation problem")); + return (SVCXPRT *) NULL; + } + madesock = TRUE; + } + memset (&addr, '\0', sizeof (addr)); + addr.sun_family = AF_UNIX; + len = strlen (path) + 1; + memcpy (addr.sun_path, path, len); + len += sizeof (addr.sun_family); + + __bind (sock, (struct sockaddr *) &addr, len); + + if (__getsockname (sock, (struct sockaddr *) &addr, &len) != 0 + || __listen (sock, SOMAXCONN) != 0) + { + perror (_("svc_unix.c - cannot getsockname or listen")); + if (madesock) + __close (sock); + return (SVCXPRT *) NULL; + } + + r = (struct unix_rendezvous *) mem_alloc (sizeof (*r)); + xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); + if (r == NULL || xprt == NULL) + { + __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 = &svcunix_rendezvous_op; + xprt->xp_port = -1; + xprt->xp_sock = sock; + xprt_register (xprt); + return xprt; +} +libc_hidden_nolink_sunrpc (svcunix_create, GLIBC_2_1) + +/* + * Like svunix_create(), except the routine takes any *open* UNIX file + * descriptor as its first input. + */ +SVCXPRT * +svcunixfd_create (int fd, u_int sendsize, u_int recvsize) +{ + return makefd_xprt (fd, sendsize, recvsize); +} +libc_hidden_nolink_sunrpc (svcunixfd_create, GLIBC_2_1) + +static SVCXPRT * +internal_function +makefd_xprt (int fd, u_int sendsize, u_int recvsize) +{ + SVCXPRT *xprt; + struct unix_conn *cd; + + xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); + cd = (struct unix_conn *) mem_alloc (sizeof (struct unix_conn)); + if (xprt == (SVCXPRT *) NULL || cd == (struct unix_conn *) NULL) + { + (void) __fxprintf (NULL, "%s: %s", "svc_unix: makefd_xprt", + _("out of memory\n")); + mem_free (xprt, sizeof (SVCXPRT)); + mem_free (cd, sizeof (struct unix_conn)); + return NULL; + } + cd->strm_stat = XPRT_IDLE; + xdrrec_create (&(cd->xdrs), sendsize, recvsize, + (caddr_t) xprt, readunix, writeunix); + 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 = &svcunix_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 unix_rendezvous *r; + struct sockaddr_un addr; + struct sockaddr_in in_addr; + socklen_t len; + + r = (struct unix_rendezvous *) xprt->xp_p1; +again: + len = sizeof (struct sockaddr_un); + if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0) + { + if (errno == EINTR) + goto again; + __svc_accept_failed (); + return FALSE; + } + /* + * make a new transporter (re-uses xprt) + */ + memset (&in_addr, '\0', sizeof (in_addr)); + in_addr.sin_family = AF_UNIX; + xprt = makefd_xprt (sock, r->sendsize, r->recvsize); + memcpy (&xprt->xp_raddr, &in_addr, sizeof (in_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 +svcunix_destroy (SVCXPRT *xprt) +{ + struct unix_conn *cd = (struct unix_conn *) xprt->xp_p1; + + xprt_unregister (xprt); + __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 unix_conn)); + mem_free ((caddr_t) xprt, sizeof (SVCXPRT)); +} + +#ifdef SCM_CREDENTIALS +struct cmessage { + struct cmsghdr cmsg; + struct ucred cmcred; + /* hack to make sure we have enough memory */ + char dummy[(CMSG_ALIGN (sizeof (struct ucred)) - sizeof (struct ucred) + sizeof (long))]; +}; + +/* XXX This is not thread safe, but since the main functions in svc.c + and the rpcgen generated *_svc functions for the daemon are also not + thread safe and uses static global variables, it doesn't matter. */ +static struct cmessage cm; +#endif + +static int +__msgread (int sock, void *data, size_t cnt) +{ + struct iovec iov; + struct msghdr msg; + int len; + + iov.iov_base = data; + iov.iov_len = cnt; + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_name = NULL; + msg.msg_namelen = 0; +#ifdef SCM_CREDENTIALS + msg.msg_control = (caddr_t) &cm; + msg.msg_controllen = sizeof (struct cmessage); +#endif + msg.msg_flags = 0; + +#ifdef SO_PASSCRED + { + int on = 1; + if (__setsockopt (sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on))) + return -1; + } +#endif + + restart: + len = __recvmsg (sock, &msg, 0); + if (len >= 0) + { + if (msg.msg_flags & MSG_CTRUNC || len == 0) + return 0; + else + return len; + } + if (errno == EINTR) + goto restart; + return -1; +} + +static int +__msgwrite (int sock, void *data, size_t cnt) +{ +#ifndef SCM_CREDENTIALS + /* We cannot implement this reliably. */ + __set_errno (ENOSYS); + return -1; +#else + struct iovec iov; + struct msghdr msg; + struct cmsghdr *cmsg = &cm.cmsg; + struct ucred cred; + int len; + + /* XXX I'm not sure, if gete?id() is always correct, or if we should use + get?id(). But since keyserv needs geteuid(), we have no other chance. + It would be much better, if the kernel could pass both to the server. */ + cred.pid = __getpid (); + cred.uid = __geteuid (); + cred.gid = __getegid (); + + memcpy (CMSG_DATA(cmsg), &cred, sizeof (struct ucred)); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_CREDENTIALS; + cmsg->cmsg_len = sizeof(*cmsg) + sizeof(struct ucred); + + iov.iov_base = data; + iov.iov_len = cnt; + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = cmsg; + msg.msg_controllen = CMSG_ALIGN(cmsg->cmsg_len); + msg.msg_flags = 0; + + restart: + len = __sendmsg (sock, &msg, 0); + if (len >= 0) + return len; + if (errno == EINTR) + goto restart; + return -1; + +#endif +} + +/* + * reads data from the unix connection. + * any error is fatal and the connection is closed. + * (And a read of zero bytes is a half closed stream => error.) + */ +static int +readunix (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 = __msgread (sock, buf, len)) > 0) + return len; + + fatal_err: + ((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED; + return -1; +} + +/* + * writes data to the unix connection. + * Any error is fatal and the connection is closed. + */ +static int +writeunix (char *xprtptr, char * buf, int len) +{ + SVCXPRT *xprt = (SVCXPRT *) xprtptr; + int i, cnt; + + for (cnt = len; cnt > 0; cnt -= i, buf += i) + { + if ((i = __msgwrite (xprt->xp_sock, buf, cnt)) < 0) + { + ((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED; + return -1; + } + } + return len; +} + +static enum xprt_stat +svcunix_stat (SVCXPRT *xprt) +{ + struct unix_conn *cd = + (struct unix_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 +svcunix_recv (SVCXPRT *xprt, struct rpc_msg *msg) +{ + struct unix_conn *cd = (struct unix_conn *) (xprt->xp_p1); + XDR *xdrs = &(cd->xdrs); + + xdrs->x_op = XDR_DECODE; + xdrrec_skiprecord (xdrs); + if (xdr_callmsg (xdrs, msg)) + { + cd->x_id = msg->rm_xid; + /* set up verifiers */ +#ifdef SCM_CREDENTIALS + msg->rm_call.cb_verf.oa_flavor = AUTH_UNIX; + msg->rm_call.cb_verf.oa_base = (caddr_t) &cm; + msg->rm_call.cb_verf.oa_length = sizeof (cm); +#endif + return TRUE; + } + cd->strm_stat = XPRT_DIED; /* XXXX */ + return FALSE; +} + +static bool_t +svcunix_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr) +{ + return (*xdr_args) (&(((struct unix_conn *) (xprt->xp_p1))->xdrs), + args_ptr); +} + +static bool_t +svcunix_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr) +{ + XDR *xdrs = &(((struct unix_conn *) (xprt->xp_p1))->xdrs); + + xdrs->x_op = XDR_FREE; + return (*xdr_args) (xdrs, args_ptr); +} + +static bool_t +svcunix_reply (SVCXPRT *xprt, struct rpc_msg *msg) +{ + struct unix_conn *cd = (struct unix_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; +} |