mirror of git://git.suckless.org/sbase
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
|
/* See LICENSE file for copyright and license details. */
|
||
|
#include <paths.h>
|
||
|
#include <pwd.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#include <time.h>
|
||
|
#include <utmp.h>
|
||
|
|
||
|
#define PASSWD "/etc/passwd"
|
||
|
|
||
|
static FILE *last;
|
||
|
|
||
|
static void
|
||
|
lastlog(char *user)
|
||
|
{
|
||
|
struct passwd *pwd;
|
||
|
struct lastlog ll;
|
||
|
time_t lltime;
|
||
|
|
||
|
if ((pwd = getpwnam(user)) == NULL) {
|
||
|
fprintf(stderr, "unknown user: %s\n", user);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
fseek(last, pwd->pw_uid * sizeof(struct lastlog), 0);
|
||
|
fread(&ll, sizeof(struct lastlog), 1, last);
|
||
|
|
||
|
if (ferror(last)) {
|
||
|
perror("error reading lastlog");
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
|
||
|
/* on glibc `ll_time' can be an int32_t with compat32
|
||
|
* avoid compiler warning when calling ctime() */
|
||
|
lltime = ll.ll_time;
|
||
|
printf("%-8.8s %-8.8s %-16.16s %s",
|
||
|
user, ll.ll_line, ll.ll_host, ctime(&lltime));
|
||
|
}
|
||
|
|
||
|
int
|
||
|
main(int argc, char **argv)
|
||
|
{
|
||
|
FILE *fp;
|
||
|
char line[512], *p;
|
||
|
|
||
|
if ((last = fopen(_PATH_LASTLOG, "r")) == NULL) {
|
||
|
perror(_PATH_LASTLOG);
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
|
||
|
if (argc > 1) {
|
||
|
while (*++argv)
|
||
|
lastlog(*argv);
|
||
|
} else {
|
||
|
if ((fp = fopen(PASSWD, "r")) == NULL) {
|
||
|
perror(PASSWD);
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
while ((fgets(line, sizeof(line), fp)) != NULL) {
|
||
|
if ((p = strchr(line, ':')) == NULL) {
|
||
|
fputs("incorrect password file", stderr);
|
||
|
exit(-1);
|
||
|
}
|
||
|
*p = '\0';
|
||
|
lastlog(line);
|
||
|
}
|
||
|
if (fclose(fp))
|
||
|
perror(PASSWD);
|
||
|
}
|
||
|
|
||
|
fclose(last);
|
||
|
|
||
|
return EXIT_SUCCESS;
|
||
|
}
|