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unneback |
#pragma ident "@(#)auth_time.c 1.4 92/11/10 SMI"
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/*
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* auth_time.c
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*
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* This module contains the private function __rpc_get_time_offset()
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* which will return the difference in seconds between the local system's
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* notion of time and a remote server's notion of time. This must be
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* possible without calling any functions that may invoke the name
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* service. (netdir_getbyxxx, getXbyY, etc). The function is used in the
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* synchronize call of the authdes code to synchronize clocks between
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* NIS+ clients and their servers.
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*
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* Note to minimize the amount of duplicate code, portions of the
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* synchronize() function were folded into this code, and the synchronize
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* call becomes simply a wrapper around this function. Further, if this
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* function is called with a timehost it *DOES* recurse to the name
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* server so don't use it in that mode if you are doing name service code.
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*
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* Copyright (c) 1992 Sun Microsystems Inc.
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* All rights reserved.
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*
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* Side effects :
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* When called a client handle to a RPCBIND process is created
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* and destroyed. Two strings "netid" and "uaddr" are malloc'd
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* and returned. The SIGALRM processing is modified only if
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* needed to deal with TCP connections.
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*
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* NOTE: This code has had the crap beaten out it in order to convert
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* it from TI-RPC back to TD-RPC for use on FreeBSD.
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*
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* $FreeBSD: src/lib/libc/rpc/auth_time.c,v 1.4 2000/01/27 23:06:35 jasone Exp $
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*/
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#include <stdio.h>
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#include <syslog.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <sys/signal.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <rpc/rpc.h>
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#include <rpc/rpc_com.h>
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#undef NIS
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#include <rpcsvc/nis.h>
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/*
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* FreeBSD currently uses RPC 4.0, which uses portmap rather than
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* rpcbind. Consequently, we need to fake up these values here.
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* Luckily, the RPCB_GETTIME procedure uses only base XDR data types
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* so we don't need anything besides these magic numbers.
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*/
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#define RPCBPROG (u_long)100000
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#define RPCBVERS (u_long)3
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#define RPCBPROC_GETTIME (u_long)6
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#ifdef TESTING
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#define msg(x) printf("ERROR: %s\n", x)
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/* #define msg(x) syslog(LOG_ERR, "%s", x) */
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#else
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#define msg(x)
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#endif
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static int saw_alarm = 0;
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static void
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alarm_hndler(s)
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int s;
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{
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saw_alarm = 1;
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return;
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}
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/*
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* The internet time server defines the epoch to be Jan 1, 1900
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* whereas UNIX defines it to be Jan 1, 1970. To adjust the result
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* from internet time-service time, into UNIX time we subtract the
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* following offset :
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*/
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#define NYEARS (1970 - 1900)
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#define TOFFSET ((u_long)60*60*24*(365*NYEARS + (NYEARS/4)))
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/*
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* Stolen from rpc.nisd:
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* Turn a 'universal address' into a struct sockaddr_in.
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* Bletch.
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*/
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static int uaddr_to_sockaddr(uaddr, sin)
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#ifdef foo
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endpoint *endpt;
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#endif
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char *uaddr;
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struct sockaddr_in *sin;
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{
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unsigned char p_bytes[2];
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int i;
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unsigned long a[6];
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i = sscanf(uaddr, "%lu.%lu.%lu.%lu.%lu.%lu", &a[0], &a[1], &a[2],
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&a[3], &a[4], &a[5]);
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if (i < 6)
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return(1);
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for (i = 0; i < 4; i++)
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sin->sin_addr.s_addr |= (a[i] & 0x000000FF) << (8 * i);
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p_bytes[0] = (unsigned char)a[4] & 0x000000FF;
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p_bytes[1] = (unsigned char)a[5] & 0x000000FF;
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sin->sin_family = AF_INET; /* always */
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bcopy((char *)&p_bytes, (char *)&sin->sin_port, 2);
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return (0);
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}
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/*
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* free_eps()
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*
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* Free the strings that were strduped into the eps structure.
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*/
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static void
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free_eps(eps, num)
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endpoint eps[];
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int num;
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{
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int i;
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for (i = 0; i < num; i++) {
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free(eps[i].uaddr);
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free(eps[i].proto);
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free(eps[i].family);
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}
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return;
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}
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/*
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* get_server()
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*
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* This function constructs a nis_server structure description for the
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* indicated hostname.
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*
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* NOTE: There is a chance we may end up recursing here due to the
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* fact that gethostbyname() could do an NIS search. Ideally, the
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* NIS+ server will call __rpc_get_time_offset() with the nis_server
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* structure already populated.
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*/
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static nis_server *
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get_server(sin, host, srv, eps, maxep)
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struct sockaddr_in *sin;
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char *host; /* name of the time host */
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nis_server *srv; /* nis_server struct to use. */
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endpoint eps[]; /* array of endpoints */
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int maxep; /* max array size */
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{
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char hname[256];
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int num_ep = 0, i;
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struct hostent *he;
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struct hostent dummy;
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char *ptr[2];
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if (host == NULL && sin == NULL)
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return (NULL);
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if (sin == NULL) {
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he = gethostbyname(host);
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if (he == NULL)
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return(NULL);
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} else {
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he = &dummy;
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ptr[0] = (char *)&sin->sin_addr.s_addr;
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ptr[1] = NULL;
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dummy.h_addr_list = ptr;
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}
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/*
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* This is lame. We go around once for TCP, then again
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* for UDP.
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*/
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for (i = 0; (he->h_addr_list[i] != NULL) && (num_ep < maxep);
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i++, num_ep++) {
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struct in_addr *a;
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a = (struct in_addr *)he->h_addr_list[i];
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snprintf(hname, sizeof(hname), "%s.0.111", inet_ntoa(*a));
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eps[num_ep].uaddr = strdup(hname);
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eps[num_ep].family = strdup("inet");
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eps[num_ep].proto = strdup("tcp");
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}
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for (i = 0; (he->h_addr_list[i] != NULL) && (num_ep < maxep);
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i++, num_ep++) {
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struct in_addr *a;
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| 199 |
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a = (struct in_addr *)he->h_addr_list[i];
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snprintf(hname, sizeof(hname), "%s.0.111", inet_ntoa(*a));
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eps[num_ep].uaddr = strdup(hname);
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eps[num_ep].family = strdup("inet");
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eps[num_ep].proto = strdup("udp");
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}
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| 206 |
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srv->name = (nis_name) host;
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srv->ep.ep_len = num_ep;
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srv->ep.ep_val = eps;
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srv->key_type = NIS_PK_NONE;
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| 210 |
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srv->pkey.n_bytes = NULL;
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| 211 |
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srv->pkey.n_len = 0;
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| 212 |
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return (srv);
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| 213 |
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}
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| 214 |
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| 215 |
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/*
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| 216 |
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* __rpc_get_time_offset()
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| 217 |
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*
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| 218 |
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* This function uses a nis_server structure to contact the a remote
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* machine (as named in that structure) and returns the offset in time
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* between that machine and this one. This offset is returned in seconds
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* and may be positive or negative.
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*
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| 223 |
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* The first time through, a lot of fiddling is done with the netconfig
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| 224 |
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* stuff to find a suitable transport. The function is very aggressive
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| 225 |
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* about choosing UDP or at worst TCP if it can. This is because
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* those transports support both the RCPBIND call and the internet
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* time service.
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| 228 |
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*
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| 229 |
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* Once through, *uaddr is set to the universal address of
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| 230 |
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* the machine and *netid is set to the local netid for the transport
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* that uaddr goes with. On the second call, the netconfig stuff
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* is skipped and the uaddr/netid pair are used to fetch the netconfig
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| 233 |
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* structure and to then contact the machine for the time.
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| 234 |
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*
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| 235 |
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* td = "server" - "client"
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| 236 |
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*/
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| 237 |
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int
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| 238 |
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__rpc_get_time_offset(td, srv, thost, uaddr, netid)
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| 239 |
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struct timeval *td; /* Time difference */
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| 240 |
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nis_server *srv; /* NIS Server description */
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| 241 |
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char *thost; /* if no server, this is the timehost */
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| 242 |
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char **uaddr; /* known universal address */
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| 243 |
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struct sockaddr_in *netid; /* known network identifier */
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| 244 |
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{
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| 245 |
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CLIENT *clnt; /* Client handle */
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| 246 |
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endpoint *ep, /* useful endpoints */
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| 247 |
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*useep = NULL; /* endpoint of xp */
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| 248 |
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char *useua = NULL; /* uaddr of selected xp */
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| 249 |
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int epl, i; /* counters */
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| 250 |
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enum clnt_stat status; /* result of clnt_call */
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| 251 |
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u_long thetime, delta;
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| 252 |
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int needfree = 0;
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| 253 |
|
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struct timeval tv;
|
| 254 |
|
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int time_valid;
|
| 255 |
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int udp_ep = -1, tcp_ep = -1;
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| 256 |
|
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int a1, a2, a3, a4;
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| 257 |
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char ut[64], ipuaddr[64];
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| 258 |
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endpoint teps[32];
|
| 259 |
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nis_server tsrv;
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| 260 |
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void (*oldsig)() = NULL; /* old alarm handler */
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| 261 |
|
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struct sockaddr_in sin;
|
| 262 |
|
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int s = RPC_ANYSOCK, len;
|
| 263 |
|
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int type = 0;
|
| 264 |
|
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|
| 265 |
|
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td->tv_sec = 0;
|
| 266 |
|
|
td->tv_usec = 0;
|
| 267 |
|
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|
| 268 |
|
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/*
|
| 269 |
|
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* First check to see if we need to find and address for this
|
| 270 |
|
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* server.
|
| 271 |
|
|
*/
|
| 272 |
|
|
if (*uaddr == NULL) {
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| 273 |
|
|
if ((srv != NULL) && (thost != NULL)) {
|
| 274 |
|
|
msg("both timehost and srv pointer used!");
|
| 275 |
|
|
return (0);
|
| 276 |
|
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}
|
| 277 |
|
|
if (! srv) {
|
| 278 |
|
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srv = get_server(netid, thost, &tsrv, teps, 32);
|
| 279 |
|
|
if (srv == NULL) {
|
| 280 |
|
|
msg("unable to contruct server data.");
|
| 281 |
|
|
return (0);
|
| 282 |
|
|
}
|
| 283 |
|
|
needfree = 1; /* need to free data in endpoints */
|
| 284 |
|
|
}
|
| 285 |
|
|
|
| 286 |
|
|
ep = srv->ep.ep_val;
|
| 287 |
|
|
epl = srv->ep.ep_len;
|
| 288 |
|
|
|
| 289 |
|
|
/* Identify the TCP and UDP endpoints */
|
| 290 |
|
|
for (i = 0;
|
| 291 |
|
|
(i < epl) && ((udp_ep == -1) || (tcp_ep == -1)); i++) {
|
| 292 |
|
|
if (strcasecmp(ep[i].proto, "udp") == 0)
|
| 293 |
|
|
udp_ep = i;
|
| 294 |
|
|
if (strcasecmp(ep[i].proto, "tcp") == 0)
|
| 295 |
|
|
tcp_ep = i;
|
| 296 |
|
|
}
|
| 297 |
|
|
|
| 298 |
|
|
/* Check to see if it is UDP or TCP */
|
| 299 |
|
|
if (tcp_ep > -1) {
|
| 300 |
|
|
useep = &ep[tcp_ep];
|
| 301 |
|
|
useua = ep[tcp_ep].uaddr;
|
| 302 |
|
|
type = SOCK_STREAM;
|
| 303 |
|
|
} else if (udp_ep > -1) {
|
| 304 |
|
|
useep = &ep[udp_ep];
|
| 305 |
|
|
useua = ep[udp_ep].uaddr;
|
| 306 |
|
|
type = SOCK_DGRAM;
|
| 307 |
|
|
}
|
| 308 |
|
|
|
| 309 |
|
|
if (useep == NULL) {
|
| 310 |
|
|
msg("no acceptable transport endpoints.");
|
| 311 |
|
|
if (needfree)
|
| 312 |
|
|
free_eps(teps, tsrv.ep.ep_len);
|
| 313 |
|
|
return (0);
|
| 314 |
|
|
}
|
| 315 |
|
|
}
|
| 316 |
|
|
|
| 317 |
|
|
/*
|
| 318 |
|
|
* Create a sockaddr from the uaddr.
|
| 319 |
|
|
*/
|
| 320 |
|
|
if (*uaddr != NULL)
|
| 321 |
|
|
useua = *uaddr;
|
| 322 |
|
|
|
| 323 |
|
|
/* Fixup test for NIS+ */
|
| 324 |
|
|
sscanf(useua, "%d.%d.%d.%d.", &a1, &a2, &a3, &a4);
|
| 325 |
|
|
sprintf(ipuaddr, "%d.%d.%d.%d.0.111", a1, a2, a3, a4);
|
| 326 |
|
|
useua = &ipuaddr[0];
|
| 327 |
|
|
|
| 328 |
|
|
bzero((char *)&sin, sizeof(sin));
|
| 329 |
|
|
if (uaddr_to_sockaddr(useua, &sin)) {
|
| 330 |
|
|
msg("unable to translate uaddr to sockaddr.");
|
| 331 |
|
|
if (needfree)
|
| 332 |
|
|
free_eps(teps, tsrv.ep.ep_len);
|
| 333 |
|
|
return (0);
|
| 334 |
|
|
}
|
| 335 |
|
|
|
| 336 |
|
|
/*
|
| 337 |
|
|
* Create the client handle to rpcbind. Note we always try
|
| 338 |
|
|
* version 3 since that is the earliest version that supports
|
| 339 |
|
|
* the RPCB_GETTIME call. Also it is the version that comes
|
| 340 |
|
|
* standard with SVR4. Since most everyone supports TCP/IP
|
| 341 |
|
|
* we could consider trying the rtime call first.
|
| 342 |
|
|
*/
|
| 343 |
|
|
clnt = clnttcp_create(&sin, RPCBPROG, RPCBVERS, &s, 0, 0);
|
| 344 |
|
|
if (clnt == NULL) {
|
| 345 |
|
|
msg("unable to create client handle to rpcbind.");
|
| 346 |
|
|
if (needfree)
|
| 347 |
|
|
free_eps(teps, tsrv.ep.ep_len);
|
| 348 |
|
|
return (0);
|
| 349 |
|
|
}
|
| 350 |
|
|
|
| 351 |
|
|
tv.tv_sec = 5;
|
| 352 |
|
|
tv.tv_usec = 0;
|
| 353 |
|
|
time_valid = 0;
|
| 354 |
|
|
status = clnt_call(clnt, RPCBPROC_GETTIME, xdr_void, NULL,
|
| 355 |
|
|
xdr_u_long, (char *)&thetime, tv);
|
| 356 |
|
|
/*
|
| 357 |
|
|
* The only error we check for is anything but success. In
|
| 358 |
|
|
* fact we could have seen PROGMISMATCH if talking to a 4.1
|
| 359 |
|
|
* machine (pmap v2) or TIMEDOUT if the net was busy.
|
| 360 |
|
|
*/
|
| 361 |
|
|
if (status == RPC_SUCCESS)
|
| 362 |
|
|
time_valid = 1;
|
| 363 |
|
|
else {
|
| 364 |
|
|
int save;
|
| 365 |
|
|
|
| 366 |
|
|
/* Blow away possible stale CLNT handle. */
|
| 367 |
|
|
if (clnt != NULL) {
|
| 368 |
|
|
clnt_destroy(clnt);
|
| 369 |
|
|
clnt = NULL;
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
/*
|
| 373 |
|
|
* Convert PMAP address into timeservice address
|
| 374 |
|
|
* We take advantage of the fact that we "know" what
|
| 375 |
|
|
* the universal address looks like for inet transports.
|
| 376 |
|
|
*
|
| 377 |
|
|
* We also know that the internet timeservice is always
|
| 378 |
|
|
* listening on port 37.
|
| 379 |
|
|
*/
|
| 380 |
|
|
sscanf(useua, "%d.%d.%d.%d.", &a1, &a2, &a3, &a4);
|
| 381 |
|
|
sprintf(ut, "%d.%d.%d.%d.0.37", a1, a2, a3, a4);
|
| 382 |
|
|
|
| 383 |
|
|
if (uaddr_to_sockaddr(ut, &sin)) {
|
| 384 |
|
|
msg("cannot convert timeservice uaddr to sockaddr.");
|
| 385 |
|
|
goto error;
|
| 386 |
|
|
}
|
| 387 |
|
|
|
| 388 |
|
|
s = socket(AF_INET, type, 0);
|
| 389 |
|
|
if (s == -1) {
|
| 390 |
|
|
msg("unable to open fd to network.");
|
| 391 |
|
|
goto error;
|
| 392 |
|
|
}
|
| 393 |
|
|
|
| 394 |
|
|
/*
|
| 395 |
|
|
* Now depending on whether or not we're talking to
|
| 396 |
|
|
* UDP we set a timeout or not.
|
| 397 |
|
|
*/
|
| 398 |
|
|
if (type == SOCK_DGRAM) {
|
| 399 |
|
|
struct timeval timeout = { 20, 0 };
|
| 400 |
|
|
struct sockaddr_in from;
|
| 401 |
|
|
fd_set readfds;
|
| 402 |
|
|
int res;
|
| 403 |
|
|
|
| 404 |
|
|
if (sendto(s, &thetime, sizeof(thetime), 0,
|
| 405 |
|
|
(struct sockaddr *)&sin, sizeof(sin)) == -1) {
|
| 406 |
|
|
msg("udp : sendto failed.");
|
| 407 |
|
|
goto error;
|
| 408 |
|
|
}
|
| 409 |
|
|
do {
|
| 410 |
|
|
FD_ZERO(&readfds);
|
| 411 |
|
|
FD_SET(s, &readfds);
|
| 412 |
|
|
res = select(_rpc_dtablesize(), &readfds,
|
| 413 |
|
|
(fd_set *)NULL, (fd_set *)NULL, &timeout);
|
| 414 |
|
|
} while (res < 0 && errno == EINTR);
|
| 415 |
|
|
if (res <= 0)
|
| 416 |
|
|
goto error;
|
| 417 |
|
|
len = sizeof(from);
|
| 418 |
|
|
res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
|
| 419 |
|
|
(struct sockaddr *)&from, &len);
|
| 420 |
|
|
if (res == -1) {
|
| 421 |
|
|
msg("recvfrom failed on udp transport.");
|
| 422 |
|
|
goto error;
|
| 423 |
|
|
}
|
| 424 |
|
|
time_valid = 1;
|
| 425 |
|
|
} else {
|
| 426 |
|
|
int res;
|
| 427 |
|
|
|
| 428 |
|
|
oldsig = (void (*)())signal(SIGALRM, alarm_hndler);
|
| 429 |
|
|
saw_alarm = 0; /* global tracking the alarm */
|
| 430 |
|
|
alarm(20); /* only wait 20 seconds */
|
| 431 |
|
|
res = connect(s, (struct sockaddr *)&sin, sizeof(sin));
|
| 432 |
|
|
if (res == -1) {
|
| 433 |
|
|
msg("failed to connect to tcp endpoint.");
|
| 434 |
|
|
goto error;
|
| 435 |
|
|
}
|
| 436 |
|
|
if (saw_alarm) {
|
| 437 |
|
|
msg("alarm caught it, must be unreachable.");
|
| 438 |
|
|
goto error;
|
| 439 |
|
|
}
|
| 440 |
|
|
res = _read(s, (char *)&thetime, sizeof(thetime));
|
| 441 |
|
|
if (res != sizeof(thetime)) {
|
| 442 |
|
|
if (saw_alarm)
|
| 443 |
|
|
msg("timed out TCP call.");
|
| 444 |
|
|
else
|
| 445 |
|
|
msg("wrong size of results returned");
|
| 446 |
|
|
|
| 447 |
|
|
goto error;
|
| 448 |
|
|
}
|
| 449 |
|
|
time_valid = 1;
|
| 450 |
|
|
}
|
| 451 |
|
|
save = errno;
|
| 452 |
|
|
(void)_close(s);
|
| 453 |
|
|
errno = save;
|
| 454 |
|
|
s = RPC_ANYSOCK;
|
| 455 |
|
|
|
| 456 |
|
|
if (time_valid) {
|
| 457 |
|
|
thetime = ntohl(thetime);
|
| 458 |
|
|
thetime = thetime - TOFFSET; /* adjust to UNIX time */
|
| 459 |
|
|
} else
|
| 460 |
|
|
thetime = 0;
|
| 461 |
|
|
}
|
| 462 |
|
|
|
| 463 |
|
|
gettimeofday(&tv, 0);
|
| 464 |
|
|
|
| 465 |
|
|
error:
|
| 466 |
|
|
/*
|
| 467 |
|
|
* clean up our allocated data structures.
|
| 468 |
|
|
*/
|
| 469 |
|
|
|
| 470 |
|
|
if (s != RPC_ANYSOCK)
|
| 471 |
|
|
(void)_close(s);
|
| 472 |
|
|
|
| 473 |
|
|
if (clnt != NULL)
|
| 474 |
|
|
clnt_destroy(clnt);
|
| 475 |
|
|
|
| 476 |
|
|
alarm(0); /* reset that alarm if its outstanding */
|
| 477 |
|
|
if (oldsig) {
|
| 478 |
|
|
signal(SIGALRM, oldsig);
|
| 479 |
|
|
}
|
| 480 |
|
|
|
| 481 |
|
|
/*
|
| 482 |
|
|
* note, don't free uaddr strings until after we've made a
|
| 483 |
|
|
* copy of them.
|
| 484 |
|
|
*/
|
| 485 |
|
|
if (time_valid) {
|
| 486 |
|
|
if (*uaddr == NULL)
|
| 487 |
|
|
*uaddr = strdup(useua);
|
| 488 |
|
|
|
| 489 |
|
|
/* Round to the nearest second */
|
| 490 |
|
|
tv.tv_sec += (tv.tv_sec > 500000) ? 1 : 0;
|
| 491 |
|
|
delta = (thetime > tv.tv_sec) ? thetime - tv.tv_sec :
|
| 492 |
|
|
tv.tv_sec - thetime;
|
| 493 |
|
|
td->tv_sec = (thetime < tv.tv_sec) ? - delta : delta;
|
| 494 |
|
|
td->tv_usec = 0;
|
| 495 |
|
|
} else {
|
| 496 |
|
|
msg("unable to get the server's time.");
|
| 497 |
|
|
}
|
| 498 |
|
|
|
| 499 |
|
|
if (needfree)
|
| 500 |
|
|
free_eps(teps, tsrv.ep.ep_len);
|
| 501 |
|
|
|
| 502 |
|
|
return (time_valid);
|
| 503 |
|
|
}
|
