From df49c60c9671e4a28e636964d744c1f59fb6cb68 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 12 Jun 2000 15:00:15 +0000 Subject: Merged from 4.5.0-beta3a --- c/src/exec/librpc/src/rpc/svc_unix.c | 527 +++++++++++++++++++++++++++++++++++ 1 file changed, 527 insertions(+) (limited to 'c/src/exec/librpc/src/rpc/svc_unix.c') diff --git a/c/src/exec/librpc/src/rpc/svc_unix.c b/c/src/exec/librpc/src/rpc/svc_unix.c index e69de29bb2..b0f3175c0e 100644 --- a/c/src/exec/librpc/src/rpc/svc_unix.c +++ b/c/src/exec/librpc/src/rpc/svc_unix.c @@ -0,0 +1,527 @@ +/* + * 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 *sccsid = "from: @(#)svc_unix.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/ +/*static char *sccsid = "from: @(#)svc_unix.c 2.2 88/08/01 4.0 RPCSRC";*/ +static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc_unix.c,v 1.7 2000/01/27 23:06:42 jasone Exp $"; +#endif + +/* + * 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 listner and connection establisher) + * and a record/unix stream. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Ops vector for AF_UNIX based rpc service handle + */ +static bool_t svcunix_recv(); +static enum xprt_stat svcunix_stat(); +static bool_t svcunix_getargs(); +static bool_t svcunix_reply(); +static bool_t svcunix_freeargs(); +static void svcunix_destroy(); + +static struct xp_ops svcunix_op = { + svcunix_recv, + svcunix_stat, + svcunix_getargs, + svcunix_reply, + svcunix_freeargs, + svcunix_destroy +}; + +/* + * Ops vector for TCP/IP rendezvous handler + */ +static bool_t rendezvous_request(); +static enum xprt_stat rendezvous_stat(); + +static struct xp_ops svcunix_rendezvous_op = { + rendezvous_request, + rendezvous_stat, + (bool_t (*)())abort, + (bool_t (*)())abort, + (bool_t (*)())abort, + svcunix_destroy +}; + +static int readunix(), writeunix(); +static SVCXPRT *makefd_xprt(); + +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]; +}; + + +struct cmessage { + struct cmsghdr cmsg; + struct cmsgcred cmcred; +}; + +static struct cmessage cm; + +static int __msgread(sock, buf, cnt) + int sock; + void *buf; + size_t cnt; +{ + struct iovec iov[1]; + struct msghdr msg; + + bzero((char *)&cm, sizeof(cm)); + iov[0].iov_base = buf; + iov[0].iov_len = cnt; + + msg.msg_iov = iov; + msg.msg_iovlen = 1; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = (caddr_t)&cm; + msg.msg_controllen = sizeof(struct cmessage); + msg.msg_flags = 0; + + return(recvmsg(sock, &msg, 0)); +} + +static int __msgwrite(sock, buf, cnt) + int sock; + void *buf; + size_t cnt; +{ + struct iovec iov[1]; + struct msghdr msg; + + bzero((char *)&cm, sizeof(cm)); + iov[0].iov_base = buf; + iov[0].iov_len = cnt; + + cm.cmsg.cmsg_type = SCM_CREDS; + cm.cmsg.cmsg_level = SOL_SOCKET; + cm.cmsg.cmsg_len = sizeof(struct cmessage); + + msg.msg_iov = iov; + msg.msg_iovlen = 1; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = (caddr_t)&cm; + msg.msg_controllen = sizeof(struct cmessage); + msg.msg_flags = 0; + + return(sendmsg(sock, &msg, 0)); +} + +/* + * 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(sock, sendsize, recvsize, path) + register int sock; + u_int sendsize; + u_int recvsize; + char *path; +{ + bool_t madesock = FALSE; + register SVCXPRT *xprt; + register struct unix_rendezvous *r; + struct sockaddr_un addr; + int len = sizeof(struct sockaddr_un); + + 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; + strcpy(addr.sun_path, path); + len = strlen(addr.sun_path) + sizeof(addr.sun_family) + + sizeof(addr.sun_len) + 1; + addr.sun_len = len; + + 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) + (void)_close(sock); + return ((SVCXPRT *)NULL); + } + r = (struct unix_rendezvous *)mem_alloc(sizeof(*r)); + if (r == NULL) { + (void) fprintf(stderr, "svcunix_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, "svcunix_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 = &svcunix_rendezvous_op; + xprt->xp_port = -1 /*ntohs(addr.sin_port)*/; + 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(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 unix_conn *cd; + + xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); + if (xprt == (SVCXPRT *)NULL) { + (void) fprintf(stderr, "svc_unix: makefd_xprt: out of memory\n"); + goto done; + } + cd = (struct unix_conn *)mem_alloc(sizeof(struct unix_conn)); + if (cd == (struct unix_conn *)NULL) { + (void) fprintf(stderr, "svc_unix: 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, 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; /* 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 unix_rendezvous *r; + struct sockaddr_un addr; + struct sockaddr_in in_addr; + int len; + + r = (struct unix_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) + */ + bzero((char *)&in_addr, sizeof(in_addr)); + in_addr.sin_family = AF_UNIX; + xprt = makefd_xprt(sock, r->sendsize, r->recvsize); + xprt->xp_raddr = in_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 +svcunix_destroy(xprt) + register SVCXPRT *xprt; +{ + register struct unix_conn *cd = (struct unix_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 unix_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 unix conection. + * any error is fatal and the connection is closed. + * (And a read of zero bytes is a half closed stream => error.) + * + * Note: we have to be careful here not to allow ourselves to become + * blocked too long in this routine. While we're waiting for data from one + * client, another client may be trying to connect. To avoid this situation, + * some code from svc_run() is transplanted here: the select() loop checks + * all RPC descriptors including the one we want and calls svc_getreqset2() + * to handle new requests if any are detected. + */ +static int +readunix(xprt, buf, len) + register SVCXPRT *xprt; + caddr_t buf; + register int len; +{ + register int sock = xprt->xp_sock; + struct timeval start, delta, tv; + struct timeval tmp1, tmp2; + fd_set *fds; + + delta = wait_per_try; + fds = NULL; + gettimeofday(&start, NULL); + do { + int bytes = sizeof (fd_set); + if (fds != NULL) + free(fds); + fds = (fd_set *)malloc(bytes); + if (fds == NULL) + goto fatal_err; + memcpy(fds, __svc_fdset, bytes); + + /* XXX we know the other bits are still clear */ + FD_SET(sock, fds); + tv = delta; /* in case select() implements writeback */ + switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) { + 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 = __msgread(sock, buf, len)) > 0) { + if (fds != NULL) + free(fds); + return (len); + } +fatal_err: + ((struct unix_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; + if (fds != NULL) + free(fds); + return (-1); +} + +/* + * writes data to the unix connection. + * Any error is fatal and the connection is closed. + */ +static int +writeunix(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 = __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(xprt) + SVCXPRT *xprt; +{ + register 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(xprt, msg) + SVCXPRT *xprt; + register struct rpc_msg *msg; +{ + register struct unix_conn *cd = + (struct unix_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; + /* set up verifiers */ + 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); + return (TRUE); + } + cd->strm_stat = XPRT_DIED; /* XXXX */ + return (FALSE); +} + +static bool_t +svcunix_getargs(xprt, xdr_args, args_ptr) + 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(xprt, xdr_args, args_ptr) + SVCXPRT *xprt; + xdrproc_t xdr_args; + caddr_t args_ptr; +{ + register 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(xprt, msg) + SVCXPRT *xprt; + register struct rpc_msg *msg; +{ + register struct unix_conn *cd = + (struct unix_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); +} -- cgit v1.2.3