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netdate
netdate-1.2.dif
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File netdate-1.2.dif of Package netdate
--- Makefile +++ Makefile @@ -1,13 +1,20 @@ CC=gcc +WARNINGS=-Wall -W -Wpointer-arith -Wbad-function-cast -Wcast-qual \ + -Wstrict-prototypes -Wmissing-prototypes \ + -Wmissing-declarations -Wnested-externs -Winline -Wcast-align + +CFLAGS = $(RPM_OPT_FLAGS) -D_GNU_SOURCE $(WARNINGS) + all: netdate netdate: netdate.o install: netdate - install -s -m 0755 netdate /usr/local/sbin/netdate - install -m 0644 netdate.8 /usr/local/man/man8 + install -m 0755 netdate ${DESTDIR}/usr/sbin/netdate + install -m 0644 netdate.8 ${DESTDIR}/usr/share/man/man8 clean: - rm -f netdate *.o core + rm -f netdate *~ *.o core + --- netdate.8 +++ netdate.8 @@ -53,40 +53,40 @@ if that host supplies it. .SH EXAMPLE The most accurate hosts are named first in each example. -Some such call on \fInetdate\fP should be put at the end of \fB/etc/rc.local\fP, +Some such call on \fInetdate\fP should be put at the end of \fB/etc/init.d/boot.local\fP, so that the time will be set properly on system startup. -It is also useful to have a shell script, e.g., \fB/etc/timehosts\fP, +It is also useful to have a shell script, e.g., \fB/sbin/timehosts\fP, which contains a call on \fInetdate\fP with arguments appropriate to the local system, so that it is easy to set the time manually. -.SH "netdate -l 30 udp dcn\-gateway tcp neighbor" -\fIDcn\-gateway\fP is a hypothetical host which usually keeps time +.SH "netdate -l 30 udp dcn\-gate tcp neighbor" +\fIDcn\-gate\fP is a hypothetical host which usually keeps time accurate to within milliseconds of Coordinated Universal Time, but may occasionally be eight hours off. \fINeighbor\fP is a neighbor of the local host which keeps time with moderate accuracy. -The time will be set to that of \fIdcn\-gateway\fP if that and \fIneighbor\fP +The time will be set to that of \fIdcn\-gate\fP if that and \fIneighbor\fP agree to within thirty seconds, else it will not be set at all. This is almost good enough for most circumstances, but won't do when the local host's time is known to be wrong (e.g., after a long downtime or a bad crash) and must be set to something. If one of the hosts named is inaccurate or not responding, there is a problem. -.SH "netdate -l 30 udp dcn\-gateway tcp neighbor neighbor2" +.SH "netdate -l 30 udp dcn\-gate tcp neighbor neighbor2" Only two of the three hosts named must agree on the time. The time will still be set (to that of the first neighbor), -even if \fIdcn\-gateway\fP is far off as long as the two neighbors agree. +even if \fIdcn\-gate\fP is far off as long as the two neighbors agree. This is probably good enough for most cases. One can arbitrarily gerrymander the vote for more insurance (and less clarity), as in the following example. -.SH "netdate\ udp\ dcn\-gateway\ dcn1\ tcp\ bbn\-unix\ localhost\ neighbor" +.SH "netdate\ udp\ dcn\-gate\ dcn1\ tcp\ bbn\-unix\ localhost\ neighbor" Here \fIdcn1\fP and \fIbbn\-unix\fP are more hypothetical very accurate timekeepers, at least one of which keeps time independently from -\fIdcn\-gateway\fP, one hopes. +\fIdcn\-gate\fP, one hopes. It is very likely that the time will be set to that one of those three very accurate hosts, as long as at least two of them agree, or at least one of them agrees with the neighbor or the local host's time. If all the foreign hosts disagree, the time will not be set, since \fBlocalhost\fP will be chosen as best. -.SH "netdate\ \-l\ 3\ localhost\ localhost\ udp\ dcn\-gateway\ dcn1\ tcp\ bbn\-unix" +.SH "netdate\ \-l\ 3\ localhost\ localhost\ udp\ dcn\-gate\ dcn1\ tcp\ bbn\-unix" This example gives \fBlocalhost\fP two votes and declares it to usually have the most accurate time. All three foreign hosts must agree within three seconds @@ -95,9 +95,9 @@ Thus the time will be set only if it really needs to be. .SH FILES .nf -/etc/inet/services for the time service port number -/etc/inet/protocols for the protocol numbers -/etc/wtmp to record time-setting +/etc/services for the time service port number +/etc/protocols for the protocol numbers +/var/log/wtmp to record time-setting .SH SEE ALSO ARPANET Request for Comments 868, gettimeofday(2), date(1), WWV (USA): --- netdate.c +++ netdate.c @@ -1,4 +1,4 @@ -/* +/* NO WARRANTY THERE IS NO WARRANTY FOR THIS PROGRAM, TO THE EXTENT PERMITTED BY @@ -8,8 +8,8 @@ THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF - ALL NECESSARY SERVICING, REPAIR OR CORRECTION. - + ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY @@ -18,13 +18,13 @@ DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF - SUCH DAMAGES. - + SUCH DAMAGES. + */ /* fixes for netdate 1.16 -1) utmp handling +1) utmp handling 2) trying to read 64 bit on 64bit machines instead of 32bit 3) renamed getdate() to mygetdate() because getdate() is a UNIX98 function 4) reduced number of global vars @@ -58,7 +58,7 @@ /* but only if we cant find anything better */ #ifndef WTMP_FILE -#define WTMP "/etc/wtmp" +#define WTMP "/var/log/wtmp" #else #define WTMP WTMP_FILE #endif @@ -66,7 +66,7 @@ char *defaultproto = "udp"; /* difference between 1900 (RFC868) and 1970 (UNIX) base times */ -#define NETBASE 2208988800 +#define NETBASE 2208988800u long limit = 5; #define MAXHOSTS 20 @@ -92,15 +92,13 @@ void usage (void); int setproto (char *, struct timehost *); -void main (int, char **); int getdiff (struct timehost *); int mygetdate (struct timehost *); void printit (struct timehost *); void tvsub (struct timeval *, struct timeval *, struct timeval *); void printdiff (char *, struct timeval *); -void timeout (); +void timeout (void); static int internettime (struct timehost *thishost); -long getport (char *protoname); static int internettime (struct timehost *thishost); struct timehost *mungediffs(struct timehost *); @@ -112,7 +110,7 @@ fprintf (stderr, "usage: %s [ -l limit ] host ...\n" "%s tries to find a group of at least two hosts whose times agree\n" -"within %d seconds, and sets the time to that of the first host in the group.\n", +"within %ld seconds, and sets the time to that of the first host in the group.\n", whoami, whoami, limit); fprintf (stderr, "The limit may be set with the -l option. Setting it to zero (or supplying\n" @@ -126,11 +124,9 @@ int verbose = 0; int debug = 0; -void +int main (int argc, char **argv) { - extern char *rindex(); - struct timehost *mungediffs(); register struct timehost *thishost; int hostargs = 0; @@ -170,7 +166,7 @@ if (*argv == NULL) usage(); if (debug) - fprintf (stderr, "%s: rdate %d; verbose %d; limit %d.\n", + fprintf (stderr, "%s: rdate %d; verbose %d; limit %ld.\n", whoami, rdate, verbose, limit); for (thishost = &timehosts[0]; *argv != NULL; argv++) { if (thishost >= tophost) { @@ -204,7 +200,7 @@ exit(1); if ((thishost = mungediffs(thishost)) == NULL) { fprintf (stderr, - "No two hosts agree on the time within %d seconds\n", + "No two hosts agree on the time within %ld seconds\n", limit); exit(1); } @@ -273,7 +269,7 @@ and return the first of that group. If no two hosts agree, give up. */ - + struct timehost * mungediffs(struct timehost *tophost) { @@ -299,7 +295,7 @@ } } if (verbose) { - printf (" %d\n", thishost -> count); + printf (" %ld\n", thishost -> count); (void)fflush(stdout); } if (thishost -> count > goodhost -> count) @@ -337,7 +333,7 @@ && abs((thishost -> then.tv_sec - now.tv_sec) - thishost -> difference) > limit) { fprintf (stderr, - "Time from %s has varied more than the limit of %d seconds\n", + "Time from %s has varied more than the limit of %ld seconds\n", thishost -> hostname, limit); printit(thishost); exit(1); @@ -346,22 +342,19 @@ perror ("netdate; settimeofday"); else { int wf; - if ((wf = open(WTMP, 1)) >= 0) { /* this ist at least UGLY sometimes its timeval ut_tv */ -/* on others there is ut_time */ +/* on others there is ut_time */ -#ifndef _HAVE_UT_TV - wtmp[0]->ut_time = now.tv_sec; - wtmp[1]->ut_time = thishost -> then.tv_sec; +#ifndef _HAVE_UT_TV + wtmp[0]->ut_time = now.tv_sec; + wtmp[1]->ut_time = thishost -> then.tv_sec; #else - wtmp[0]->ut_tv.tv_sec = now.tv_sec; - wtmp[1]->ut_tv.tv_sec = thishost -> then.tv_sec; -#endif - (void)lseek(wf, 0L, 2); - (void)write(wf, (char *)wtmp, sizeof(wtmp)); - (void)close(wf); - } + wtmp[0]->ut_tv.tv_sec = now.tv_sec; + wtmp[1]->ut_tv.tv_sec = thishost -> then.tv_sec; +#endif + updwtmp(WTMP, wtmp[0]); + updwtmp(WTMP, wtmp[1]); set = 1; } printit(thishost); @@ -371,8 +364,7 @@ void printit(struct timehost *thishost) { - extern char *ctime(); - struct tm *tp, *localtime(); + struct tm *tp; struct timeval diff; char newstring[128]; @@ -382,12 +374,12 @@ (void)sprintf(newstring, "%s ", thishost -> hostname); tvsub(&diff, &thishost -> then, &now); printdiff(&newstring[strlen(newstring)], &diff); - printf ("%-24s %.19s.%03d", newstring, + printf ("%-24s %.19s.%03ld", newstring, ctime((unsigned long *)&thishost -> then.tv_sec), thishost -> then.tv_usec / 1000); if (verbose) { tp = localtime((unsigned long *)&thishost -> acked); - printf(" at %02d:%02d:%02d.%03d", + printf(" at %02d:%02d:%02d.%03ld", tp -> tm_hour, tp -> tm_min, tp -> tm_sec, thishost -> acked.tv_usec / 1000); tvsub(&diff, &thishost -> acked, &thishost -> asked); @@ -421,7 +413,7 @@ static jmp_buf jb; void -timeout() +timeout(void) { longjmp(jb, 1); } @@ -429,12 +421,12 @@ static int internettime (struct timehost *thishost) { - register struct hostent *hp; - struct sockaddr_in sin; - long port; + struct addrinfo hints, *res, *res0 = NULL; + int error; int nread; - int buf; /* must be 32bit !! */ + /* must be unsigned, it's assigned to tv_sec = __un__signed long! */ + unsigned buf; static int s = -1; @@ -454,47 +446,74 @@ (void)signal(SIGALRM, timeout); if (s != -1) (void) close (s), s = -1; - port = getport(thishost -> protoname); - bzero((char *)&sin, sizeof (sin)); - sethostent(1); - if ((hp = gethostbyname(thishost -> hostname)) == NULL) { - fprintf(stderr, "%s: %s: unknown host\n", - whoami, thishost -> hostname); - goto out; - } - sin.sin_family = hp->h_addrtype; - (void)alarm(20); - s = socket(hp->h_addrtype, thishost -> socktype, 0 /*protonumber*/); + memset(&hints, 0, sizeof(hints)); + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = thishost->socktype; + hints.ai_flags = AI_CANONNAME; + error = getaddrinfo(thishost->hostname, "time", &hints, &res0); + if (error) + { + fprintf(stderr, "%s: %s: %s\n", + whoami, thishost->hostname, gai_strerror(error)); + goto out; + } + for (res = res0; res; res = res->ai_next) + { + char hbuf[NI_MAXHOST]; + + (void)alarm(20); + if (getnameinfo (res->ai_addr, res->ai_addrlen, hbuf, + sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) + strcpy(hbuf, "(invalid)"); + printf("Trying %s...\r\n", hbuf); + s = socket(res->ai_family, res->ai_socktype, + 0 /* res->ai_protocol */); + if (s < 0) + { + alarm (0); + continue; + } + break; + } if (s < 0) { - perror("netdate: socket"); - (void)alarm(0); - goto out; - } - if (thishost -> socktype == SOCK_STREAM) { - if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) { - perror("netdate: bind"); - goto bad; - } + perror("netdate: socket"); + (void)alarm(0); + goto out; + } + if (res == NULL) + { + fprintf (stderr, "No host found\n"); + (void)alarm(0); + goto out; + } + + if (thishost->socktype == SOCK_STREAM) { + struct sockaddr_storage ss; + + bzero((char *)&ss, sizeof (ss)); + ss.ss_family = res->ai_family; + if (bind(s, (struct sockaddr *)&ss, res->ai_addrlen) < 0) { + perror("netdate: bind"); + goto bad; + } } - bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); - sin.sin_port = port; (void)gettimeofday (&thishost -> asked, (struct timezone *)0); - if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) { + if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { perror("netdate: connect"); goto bad; } if (thishost -> socktype == SOCK_DGRAM) { - if (write (s, "\n", 1) < 0) { + if (send (s, "\n", 1, 0) < 0) { perror ("netdate: send"); goto bad; } } /* see note below: */ -/* nread = read (s, (char *)&thishost -> then, sizeof (thishost -> then)); */ +/* nread = read (s, (char *)&thishost -> then, sizeof (thishost -> then)); */ thishost -> then.tv_sec=0L; - nread = read (s, (char *)&buf,4); + nread = read (s, (char *)&buf,4); (void)gettimeofday (&thishost -> acked, (struct timezone *)0); (void)alarm(0); now = thishost -> acked; @@ -532,22 +551,7 @@ thishost -> bad = 1; fprintf (stderr, "Connection with %s to %s failed.\n", thishost -> protoname, thishost -> hostname); + if (res0) + freeaddrinfo (res0); return(0); } - -long -getport(char *protoname) -{ - register struct servent *sp; - static long port; - char *service = "time"; - - if (port != 0) - return(port); - if ((sp = getservbyname(service, protoname)) == 0) { - fprintf(stderr, "%s: %s/%s: unknown service\n", - whoami, service, protoname); - exit(1); - } - return (port = sp->s_port); -}
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