From cdb3c81f36283df4b53f24a374d78c695e9d8b06 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Mon, 17 Jun 2002 21:12:16 +0000 Subject: Re-backport all the rpc stuff from glibc 2.2.5. This allows us to make this junk (and I do mean that ;-) thread safe without undue pain. Adds 12k worth to the code size I'm afraid, but since I never use NFS and therefore never include this stuff, I guess thats acceptable. I still need to enable the multi-threaded bits... -Erik --- libc/inet/rpc/svc_unix.c | 533 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 533 insertions(+) create mode 100644 libc/inet/rpc/svc_unix.c (limited to 'libc/inet/rpc/svc_unix.c') diff --git a/libc/inet/rpc/svc_unix.c b/libc/inet/rpc/svc_unix.c new file mode 100644 index 000000000..8e052d8a2 --- /dev/null +++ b/libc/inet/rpc/svc_unix.c @@ -0,0 +1,533 @@ +/* + * 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 + */ + +/* + * svc_unix.c, Server side for TCP/IP based RPC. + * + * Copyright (C) 1984, Sun Microsystems, Inc. + * + * Actually implements two flavors of transporter - + * a unix rendezvouser (a listener and connection establisher) + * and a record/unix stream. + */ + +#define __FORCE_GLIBC +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef USE_IN_LIBIO +# include +#endif + +/* + * 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); + +/* 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, 2) != 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) + { +#ifdef USE_IN_LIBIO + if (_IO_fwide (stderr, 0) > 0) + __fwprintf (stderr, L"%s", _("svcunix_create: out of memory\n")); + else +#endif + fputs (_("svcunix_create: out of memory\n"), stderr); + 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; +} + +/* + * 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); +} + +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) + { +#ifdef USE_IN_LIBIO + if (_IO_fwide (stderr, 0) > 0) + (void) __fwprintf (stderr, L"%s", + _("svc_unix: makefd_xprt: out of memory\n")); + else +#endif + (void) fputs (_("svc_unix: makefd_xprt: out of memory\n"), stderr); + 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; + 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; +} -- cgit v1.2.3