Annotation of src/usr.bin/ssh/login.c, Revision 1.11
1.1 deraadt 1: /*
1.9 deraadt 2: *
3: * login.c
4: *
5: * Author: Tatu Ylonen <ylo@cs.hut.fi>
6: *
7: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: * All rights reserved
9: *
10: * Created: Fri Mar 24 14:51:08 1995 ylo
11: *
12: * This file performs some of the things login(1) normally does. We cannot
13: * easily use something like login -p -h host -f user, because there are
14: * several different logins around, and it is hard to determined what kind of
15: * login the current system has. Also, we want to be able to execute commands
16: * on a tty.
17: *
18: */
1.1 deraadt 19:
20: #include "includes.h"
1.11 ! markus 21: RCSID("$Id: login.c,v 1.10 1999/11/24 19:53:47 markus Exp $");
1.1 deraadt 22:
1.2 dugsong 23: #include <util.h>
1.1 deraadt 24: #include <utmp.h>
25: #include "ssh.h"
26:
1.10 markus 27: /*
28: * Returns the time when the user last logged in. Returns 0 if the
29: * information is not available. This must be called before record_login.
30: * The host the user logged in from will be returned in buf.
31: */
32:
33: /*
34: * Returns the time when the user last logged in (or 0 if no previous login
35: * is found). The name of the host used last time is returned in buf.
36: */
1.1 deraadt 37:
1.8 markus 38: unsigned long
39: get_last_login_time(uid_t uid, const char *logname,
40: char *buf, unsigned int bufsize)
1.1 deraadt 41: {
1.8 markus 42: struct lastlog ll;
43: char *lastlog;
44: int fd;
45:
46: lastlog = _PATH_LASTLOG;
47: buf[0] = '\0';
48:
49: fd = open(lastlog, O_RDONLY);
50: if (fd < 0)
51: return 0;
52: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
53: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
54: close(fd);
55: return 0;
56: }
57: close(fd);
58: if (bufsize > sizeof(ll.ll_host) + 1)
59: bufsize = sizeof(ll.ll_host) + 1;
60: strncpy(buf, ll.ll_host, bufsize - 1);
61: buf[bufsize - 1] = 0;
62: return ll.ll_time;
1.1 deraadt 63: }
64:
1.10 markus 65: /*
66: * Records that the user has logged in. I these parts of operating systems
67: * were more standardized.
68: */
1.1 deraadt 69:
1.8 markus 70: void
71: record_login(int pid, const char *ttyname, const char *user, uid_t uid,
1.11 ! markus 72: const char *host, struct sockaddr * addr)
1.1 deraadt 73: {
1.8 markus 74: int fd;
75: struct lastlog ll;
76: char *lastlog;
77: struct utmp u;
78: const char *utmp, *wtmp;
79:
80: /* Construct an utmp/wtmp entry. */
81: memset(&u, 0, sizeof(u));
82: strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
83: u.ut_time = time(NULL);
84: strncpy(u.ut_name, user, sizeof(u.ut_name));
85: strncpy(u.ut_host, host, sizeof(u.ut_host));
86:
87: /* Figure out the file names. */
88: utmp = _PATH_UTMP;
89: wtmp = _PATH_WTMP;
90:
91: login(&u);
92: lastlog = _PATH_LASTLOG;
93:
94: /* Update lastlog unless actually recording a logout. */
95: if (strcmp(user, "") != 0) {
1.10 markus 96: /*
97: * It is safer to bzero the lastlog structure first because
98: * some systems might have some extra fields in it (e.g. SGI)
99: */
1.8 markus 100: memset(&ll, 0, sizeof(ll));
101:
102: /* Update lastlog. */
103: ll.ll_time = time(NULL);
104: strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
105: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
106: fd = open(lastlog, O_RDWR);
107: if (fd >= 0) {
108: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
109: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
110: log("Could not write %.100s: %.100s", lastlog, strerror(errno));
111: close(fd);
112: }
1.1 deraadt 113: }
114: }
1.8 markus 115:
1.1 deraadt 116: /* Records that the user has logged out. */
117:
1.8 markus 118: void
119: record_logout(int pid, const char *ttyname)
1.1 deraadt 120: {
1.8 markus 121: const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
122: if (logout(line))
123: logwtmp(line, "", "");
1.1 deraadt 124: }