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