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Port comsat to utmpx.

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It seems comsat stats the utmpx database each 15 seconds to see whether
it has been changed. I am changing this behaviour to look at the utmpx
database upon processing. I don't want to allow direct interference with
the database files. I also wonder whether this optimization has any
measurable performance benefit nowadays.
This commit is contained in:
Ed Schouten 2010-01-13 18:25:43 +00:00
parent 426f89600c
commit 960aa5e071
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=202208
1 changed files with 21 additions and 64 deletions
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85
libexec/comsat/comsat.c
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@ -66,7 +66,7 @@ static const char rcsid[] =
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <utmp.h>
#include <utmpx.h>
int debug = 0;
#define dsyslog if (debug) syslog
@ -74,14 +74,10 @@ int debug = 0;
#define MAXIDLE 120
char hostname[MAXHOSTNAMELEN];
struct utmp *utmp = NULL;
time_t lastmsgtime;
int nutmp, uf;
void jkfprintf(FILE *, char[], char[], off_t);
void mailfor(char *);
void notify(struct utmp *, char[], off_t, int);
void onalrm(int);
void notify(struct utmpx *, char[], off_t, int);
void reapchildren(int);
int
@ -102,15 +98,7 @@ main(int argc __unused, char *argv[] __unused)
(void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
exit(1);
}
if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
(void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
exit(1);
}
(void)time(&lastmsgtime);
(void)gethostname(hostname, sizeof(hostname));
onalrm(0);
(void)signal(SIGALRM, onalrm);
(void)signal(SIGTTOU, SIG_IGN);
(void)signal(SIGCHLD, reapchildren);
for (;;) {
@ -121,11 +109,7 @@ main(int argc __unused, char *argv[] __unused)
errno = 0;
continue;
}
if (!nutmp) /* no one has logged in yet */
continue;
sigblock(sigmask(SIGALRM));
msgbuf[cc] = '\0';
(void)time(&lastmsgtime);
mailfor(msgbuf);
sigsetmask(0L);
}
@ -137,41 +121,16 @@ reapchildren(int signo __unused)
while (wait3(NULL, WNOHANG, NULL) > 0);
}
void
onalrm(int signo __unused)
{
static off_t utmpsize; /* last malloced size for utmp */
static time_t utmpmtime; /* last modification time for utmp */
struct stat statbf;
if (time(NULL) - lastmsgtime >= MAXIDLE)
exit(0);
(void)alarm((u_int)15);
(void)fstat(uf, &statbf);
if (statbf.st_mtime > utmpmtime) {
utmpmtime = statbf.st_mtime;
if (statbf.st_size > utmpsize) {
utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
if ((utmp = realloc(utmp, utmpsize)) == NULL) {
syslog(LOG_ERR, "%s", strerror(errno));
exit(1);
}
}
(void)lseek(uf, (off_t)0, SEEK_SET);
nutmp = read(uf, utmp, (size_t)statbf.st_size)/sizeof(struct utmp);
}
}
void
mailfor(char *name)
{
struct utmp *utp = &utmp[nutmp];
struct utmpx *utp;
char *cp;
char *file;
off_t offset;
int folder;
char buf[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
if (!(cp = strchr(name, '@')))
return;
@ -181,33 +140,35 @@ mailfor(char *name)
file = name;
else
file = cp + 1;
sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utmp[0].ut_name),
sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user),
name);
if (*file != '/') {
sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
(int)sizeof(utmp[0].ut_name), file);
(int)sizeof(utp->ut_user), file);
file = buf2;
}
folder = strcmp(buf, file);
while (--utp >= utmp)
if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
setutxent();
while ((utp = getutxent()) != NULL)
if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name))
notify(utp, file, offset, folder);
endutxent();
}
static const char *cr;
void
notify(struct utmp *utp, char file[], off_t offset, int folder)
notify(struct utmpx *utp, char file[], off_t offset, int folder)
{
FILE *tp;
struct stat stb;
struct termios tio;
char tty[20], name[sizeof(utmp[0].ut_name) + 1];
const char *line = utp->ut_line;
char tty[20];
const char *s = utp->ut_line;
if (strncmp(line, "pts/", 4) == 0)
line += 4;
if (strchr(line, '/')) {
if (strncmp(s, "pts/", 4) == 0)
s += 4;
if (strchr(s, '/')) {
/* A slash is an attempt to break security... */
syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
utp->ut_line);
@ -216,10 +177,10 @@ notify(struct utmp *utp, char file[], off_t offset, int folder)
(void)snprintf(tty, sizeof(tty), "%s%.*s",
_PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty);
return;
}
dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_user, tty);
switch (fork()) {
case -1:
syslog(LOG_NOTICE, "fork failed (%m)");
@ -229,25 +190,21 @@ notify(struct utmp *utp, char file[], off_t offset, int folder)
default:
return;
}
(void)signal(SIGALRM, SIG_DFL);
(void)alarm((u_int)30);
if ((tp = fopen(tty, "w")) == NULL) {
dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
_exit(1);
}
(void)tcgetattr(fileno(tp), &tio);
cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
(void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
name[sizeof(name) - 1] = '\0';
switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
case S_IXUSR:
case (S_IXUSR | S_IXGRP):
(void)fprintf(tp,
"%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
cr, name, (int)sizeof(hostname), hostname,
cr, utp->ut_user, (int)sizeof(hostname), hostname,
folder ? cr : "", folder ? "to " : "", folder ? file : "",
cr, cr);
jkfprintf(tp, name, file, offset);
jkfprintf(tp, utp->ut_user, file, offset);
break;
case S_IXGRP:
(void)fprintf(tp, "\007");