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#include <unistd.h>
#include <fcntl.h>
#include <utmp.h>
#include <time.h>
#include "time_defs.h"
#include "utmp_defs.h"
#include "prot_defs.h"
#ifndef LASTLOG_FILE
#define LASTLOG_FILE "/var/log/lastlog"
#endif
#define SC(A,B) str_copynz(A, B, sizeof(A))
void lastlog_do(char *buf, unsigned int uid, char *line) /*EXTRACT_INCL*/{
int fd = open(LASTLOG_FILE, O_RDWR);
struct lastlog ll;
off_t offset = uid * sizeof ll;
char *p=buf;
p[0] = 0;
if (fd<0 || lseek(fd, offset, SEEK_SET) != offset) goto do_close;
if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time) {
p += str_copy(p, "Last login: ");
p += nv_ctime(p, ll.ll_time, 24);
p += str_copy(p, " on ");
p += str_add(p, ll.ll_line, sizeof ll.ll_line);
if (ll.ll_host[0]) {
p += str_copy(p, " from ");
p += str_add(p, ll.ll_host, 40);
}
*p++ = '\n';
*p = 0;
}
if (lseek(fd, offset, SEEK_SET) != offset) goto do_close;
byte_zero(&ll, sizeof ll);
ll.ll_time=time(0);
SC(ll.ll_line, line);
SAFE_IO(write, fd, &ll, sizeof ll);
do_close:
close(fd);
}
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