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Let rwhod use libulog.
I am not planning on providing a mechanism tot stat() the database files directly. The disadvantage of this, is that rwhod will now be a little bit more heavy than it used to be. It normally used to fstat() the file descriptor to see whether the file had changed, but this is now impossible to implement, meaning we have to parse the entire utmp file each 180 seconds. This is probably not an issue on modern 16-way servers, but if it turns out to be a problem, we'll think of something.
This commit is contained in:
Ed Schouten
parent
a118f94c12
commit
41477e05db
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=201060
@ -7,4 +7,7 @@ MAN= rwhod.8
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# XXX breaks on Alpha due to alignment constraints
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#WARNS?= 4
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DPADD= ${LIBULOG}
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LDADD= -lulog
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.include <bsd.prog.mk>
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@ -67,8 +67,9 @@ __FBSDID("$FreeBSD$");
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#include <string.h>
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#include <syslog.h>
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#include <timeconv.h>
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#define _ULOG_POSIX_NAMES
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#include <ulog.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <pwd.h>
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#include <grp.h>
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@ -146,7 +147,7 @@ struct neighbor {
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struct neighbor *neighbors;
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struct whod mywd;
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struct servent *sp;
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int s, utmpf;
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int s;
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#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we))
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@ -231,11 +232,6 @@ main(int argc, char *argv[])
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*cp = '\0';
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strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1);
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mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0';
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utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);
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if (utmpf < 0) {
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syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
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exit(1);
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}
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getboottime(0);
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "socket: %m");
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@ -383,73 +379,43 @@ verify(name, maxlen)
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return (size > 0);
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}
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int utmptime;
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int utmpent;
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int utmpsize = 0;
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struct utmp *utmp;
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int alarmcount;
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void
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onalrm(signo)
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int signo __unused;
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onalrm(int signo __unused)
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{
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register struct neighbor *np;
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register struct whoent *we = mywd.wd_we, *wlast;
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register int i;
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struct neighbor *np;
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struct whoent *we = mywd.wd_we, *wend;
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struct stat stb;
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struct utmpx *ut;
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static int alarmcount = 0;
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double avenrun[3];
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time_t now;
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int cc;
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int i, cc;
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now = time(NULL);
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if (alarmcount % 10 == 0)
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getboottime(0);
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alarmcount++;
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(void) fstat(utmpf, &stb);
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if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
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utmptime = stb.st_mtime;
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if (stb.st_size > utmpsize) {
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utmpsize = stb.st_size + 10 * sizeof(struct utmp);
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utmp = (struct utmp *)reallocf(utmp, utmpsize);
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if (utmp == NULL) {
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syslog(LOG_WARNING, "malloc failed");
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utmpsize = 0;
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goto done;
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}
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}
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(void) lseek(utmpf, (off_t)0, L_SET);
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cc = read(utmpf, (char *)utmp, stb.st_size);
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if (cc < 0) {
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syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP);
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goto done;
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}
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wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1];
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utmpent = cc / sizeof(struct utmp);
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for (i = 0; i < utmpent; i++)
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if (utmp[i].ut_name[0]) {
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memcpy(we->we_utmp.out_line, utmp[i].ut_line,
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sizeof(utmp[i].ut_line));
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memcpy(we->we_utmp.out_name, utmp[i].ut_name,
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sizeof(utmp[i].ut_name));
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we->we_utmp.out_time = htonl(utmp[i].ut_time);
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if (we >= wlast)
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break;
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we++;
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}
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utmpent = we - mywd.wd_we;
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wend = &mywd.wd_we[1024 / sizeof(struct whoent)];
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setutxent();
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while ((ut = getutxent()) != NULL && we < wend) {
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if (ut->ut_type != USER_PROCESS)
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continue;
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strncpy(we->we_utmp.out_line, ut->ut_line,
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sizeof(we->we_utmp.out_line));
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strncpy(we->we_utmp.out_name, ut->ut_user,
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sizeof(we->we_utmp.out_name));
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we->we_utmp.out_time =
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htonl(_time_to_time32(ut->ut_tv.tv_sec));
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we++;
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}
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endutxent();
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/*
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* The test on utmpent looks silly---after all, if no one is
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* logged on, why worry about efficiency?---but is useful on
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* (e.g.) compute servers.
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*/
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if (utmpent && chdir(_PATH_DEV)) {
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if (chdir(_PATH_DEV)) {
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syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
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exit(1);
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}
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we = mywd.wd_we;
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for (i = 0; i < utmpent; i++) {
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wend = we;
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for (we = mywd.wd_we; we < wend; we++) {
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if (stat(we->we_utmp.out_line, &stb) >= 0)
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we->we_idle = htonl(now - stb.st_atime);
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we++;
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@ -457,7 +423,7 @@ onalrm(signo)
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(void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
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for (i = 0; i < 3; i++)
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mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
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cc = (char *)we - (char *)&mywd;
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cc = (char *)wend - (char *)&mywd;
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mywd.wd_sendtime = htonl(_time_to_time32(time(NULL)));
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mywd.wd_vers = WHODVERSION;
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mywd.wd_type = WHODTYPE_STATUS;
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@ -485,11 +451,10 @@ onalrm(signo)
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} else (void) sendto(s, (char *)&mywd, cc, 0,
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np->n_addr, np->n_addrlen);
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}
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if (utmpent && chdir(_PATH_RWHODIR)) {
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if (chdir(_PATH_RWHODIR)) {
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syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
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exit(1);
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}
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done:
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(void) alarm(AL_INTERVAL);
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}
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