diff options
Diffstat (limited to 'usr.sbin/rpc.yppasswdd/yppasswd_comm.c')
| -rw-r--r-- | usr.sbin/rpc.yppasswdd/yppasswd_comm.c | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/usr.sbin/rpc.yppasswdd/yppasswd_comm.c b/usr.sbin/rpc.yppasswdd/yppasswd_comm.c deleted file mode 100644 index a5a5bf0..0000000 --- a/usr.sbin/rpc.yppasswdd/yppasswd_comm.c +++ /dev/null @@ -1,303 +0,0 @@ -/* - * Copyright (c) 1995, 1996 - * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Bill Paul. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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. - * - * $Id$ - */ - -/* - * This file contains a UNIX domain socket communications package - * that lets a client process send pseudo-RPCs to rpc.yppasswdd - * without using IP. This 'local-only' communications channel is - * only used when the superuser runs passwd(1) or chpass(1) on - * the NIS master server. The idea is that we want to grant the - * superuser permission to perfom certain special operations, but - * we need an iron-clad way to tell when we're receiving a request - * from the superuser and when we aren't. To connect to a UNIX - * domain socket, one needs to be able to access a file in the - * filesystem. The socket created by rpc.yppasswdd is owned by - * root and has all its permission bits cleared, so the only - * user who can sucessfully connect() to it is root. - * - * It is the server's responsibility to initialize the listening - * socket with the makeservsock() function and to add the socket to - * the set of file descriptors monitored by the svc_run() loop. - * Once this is done, calls made through the UNIX domain socket - * can be handled almost exactly like a normal RPC. We even use - * the XDR functions for serializing data between the client and - * server to simplify the passing of complex data structures. - */ - -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <unistd.h> -#include <err.h> -#include <errno.h> -#include <sys/time.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/un.h> -#include <sys/fcntl.h> -#include <rpc/rpc.h> -#include <rpcsvc/yp.h> -#include "yppasswd_comm.h" -#include "yppasswd_private.h" -#include "ypxfr_extern.h" - -#ifndef lint -static const char rcsid[] = "$Id$"; -#endif - -char *sockname = "/var/run/ypsock"; -FILE *serv_fp; -FILE *clnt_fp; -int serv_sock; -int clnt_sock; - -/* - * serialize_data() and serialize_resp() are what really do most of - * the work. These functions (ab)use xdrstdio_create() as the interface - * to the XDR library. The RPC library uses xdrrec_create() and friends - * for TCP based connections. I suppose we could use that here, but - * the interface is a bit too complicated to justify using in an - * applicatuion such as this. With xdrstdio_create(), the only catch - * is that we need to provide a buffered file stream rather than - * a simple socket descriptor, but we can easily turn the latter into - * the former using fdopen(2). - * - * Doing things this way buys us the ability to change the form of - * the data being exchanged without having to modify any of the - * routines in this package. - */ -static int serialize_data(data, fp, op) - struct master_yppasswd *data; - FILE *fp; - int op; -{ - XDR xdrs; - - xdrstdio_create(&xdrs, fp, op); - - if (!xdr_master_yppasswd(&xdrs, data)) { - xdr_destroy(&xdrs); - return(1); - } - return(0); -} - -static int serialize_resp(resp, fp, op) - int *resp; - FILE *fp; - int op; -{ - XDR xdrs; - - xdrstdio_create(&xdrs, fp, op); - - if (!xdr_int(&xdrs, resp)) { - xdr_destroy(&xdrs); - return(1); - } - return(0); -} - -/* - * Build the server's listening socket. The descriptor generated - * here will be monitored for new connections by the svc_run() loop. - */ -int makeservsock() -{ - static int ypsock; - struct sockaddr_un us; - int len; - - unlink(sockname); - - if ((ypsock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) - err(1, "failed to create UNIX domain socket"); - - bzero((char *)&us, sizeof(us)); - us.sun_family = AF_UNIX; - strcpy((char *)&us.sun_path, sockname); - us.sun_len = len = sizeof(us.sun_len) + sizeof(us.sun_family) + - strlen(us.sun_path) + 1; - - if (bind(ypsock, (struct sockaddr *)&us, len) == -1) - err(1,"failed to bind UNIX domain socket"); - - listen (ypsock, 1); - - return(ypsock); -} - -/* - * Create a socket for a client and try to connect() it to the - * server. - */ -static int makeclntsock() -{ - static int ypsock; - struct sockaddr_un us; - int len; - - if ((ypsock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { - warn("failed to create UNIX domain socket"); - return(-1); - } - - bzero((char *)&us, sizeof(us)); - us.sun_family = AF_UNIX; - strcpy((char *)&us.sun_path, sockname); - us.sun_len = len = sizeof(us.sun_len) + sizeof(us.sun_family) + - strlen(us.sun_path) + 1; - - if (connect(ypsock, (struct sockaddr *)&us, len) == -1) { - warn("failed to connect to server"); - return(-1); - } - - return(ypsock); -} - -/* - * This function is used by the server to accept a new connection - * from a client and read its request data into a master_yppasswd - * stucture. - */ -struct master_yppasswd *getdat(sock) - int sock; -{ - int len; - struct sockaddr_un us; - static struct master_yppasswd pw; - struct timeval tv; - fd_set fds; - - FD_ZERO(&fds); - FD_SET(sock, &fds); - - tv.tv_sec = CONNECTION_TIMEOUT; - tv.tv_usec = 0; - - switch(select(FD_SETSIZE, &fds, NULL, NULL, &tv)) { - case 0: - yp_error("select timed out"); - return(NULL); - break; - case -1: - yp_error("select() failed: %s", strerror(errno)); - return(NULL); - break; - default: - break; - } - - len = sizeof(us); - if ((serv_sock = accept(sock, (struct sockaddr *)&us, &len)) == -1) { - yp_error("accept failed: %s", strerror(errno)); - return(NULL); - } - - if ((serv_fp = fdopen(serv_sock, "r+")) == NULL) { - yp_error("fdopen failed: %s",strerror(errno)); - return(NULL); - } - - if (serialize_data(&pw, serv_fp, XDR_DECODE)) { - yp_error("failed to receive data"); - return(NULL); - } - - return(&pw); -} - -/* - * Client uses this to read back a response code (a single - * integer) from the server. Note that we don't need to implement - * any special XDR function for this since an int is a base data - * type which the XDR library can handle directly. - */ -int *getresp() -{ - static int resp; - - if (serialize_resp(&resp, clnt_fp, XDR_DECODE)) { - warn("failed to receive response"); - return(NULL); - } - - fclose(clnt_fp); - close(clnt_sock); - return(&resp); -} - -/* - * Create a connection to the server and send a reqest - * to be processed. - */ -int senddat(pw) - struct master_yppasswd *pw; -{ - - if ((clnt_sock = makeclntsock()) == -1) { - warn("failed to create socket"); - return(1); - } - - if ((clnt_fp = fdopen(clnt_sock, "r+")) == NULL) { - warn("fdopen failed"); - return(1); - } - - if (serialize_data(pw, clnt_fp, XDR_ENCODE)) { - warn("failed to send data"); - return(1); - } - - return(0); -} - -/* - * This sends a response code back to the client. - */ -int sendresp(resp) - int resp; -{ - - if (serialize_resp(&resp, serv_fp, XDR_ENCODE)) { - yp_error("failed to send response"); - return(-1); - } - - fclose(serv_fp); - close(serv_sock); - return(0); -} |
