Many changes to new login code based on Damien's feedback:
- Removed many redundant accessor/mutator methods as they're not necesary
in OpenSSH
- Added proper credits for OpenBSD code in loginrec.c
- Changed function definitions to the OpenBSD style
- Removed spurious 'L' prefix in line filename abbreviation for ut_line
- Added some documentation in loginrec.c
- Changed lastlog access function names
- Removed #include lines in mid-file loginrec.c
- loginrec.h, login.c and logintest.c changed to reflect new interface
- Added TODO note for ttyslot() replacement
diff --git a/loginrec.c b/loginrec.c
index 3991d91..ed14f3a 100644
--- a/loginrec.c
+++ b/loginrec.c
@@ -1,5 +1,8 @@
/*
* Copyright (c) 2000 Andre Lucas. All rights reserved.
+ * Portions copyright (c) 1998 Todd C. Miller
+ * Portions copyright (c) 1996 Jason Downs
+ * Portions copyright (c) 1996 Theo de Raadt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -31,9 +34,106 @@
** loginrec.c: platform-independent login recording and lastlog retrieval
**/
+/*
+ The new login code explained
+ ============================
+
+ This code attempts to provide a common interface to login recording
+ (utmp and friends) and last login time retrieval.
+
+ Its primary means of achieving this is to use 'struct logininfo', a
+ union of all the useful fields in the various different types of
+ system login record structures one finds on UNIX variants.
+
+ We depend on autoconf to define which recording methods are to be
+ used, and which fields are contained in the relevant data structures
+ on the local system. Many C preprocessor symbols affect which code
+ gets compiled here.
+
+ The code is designed to make it easy to modify a particular
+ recording method, without affecting other methods nor requiring so
+ many nested conditional compilation blocks as were commonplace in
+ the old code.
+
+ For login recording, we try to use the local system's libraries as
+ these are clearly most likely to work correctly. For utmp systems
+ this usually means login() and logout() or setutent() etc., probably
+ in libutil, along with logwtmp() etc. On these systems, we fall back
+ to writing the files directly if we have to, though this method
+ requires very thorough testing so we do not corrupt local auditing
+ information. These files and their access methods are very system
+ specific indeed.
+
+ For utmpx systems, the corresponding library functions are
+ setutxent() etc. To the author's knowledge, all utmpx systems have
+ these library functions and so no direct write is attempted. If such
+ a system exists and needs support, direct analogues of the [uw]tmp
+ code should suffice.
+
+ Retrieving the time of last login ('lastlog') is in some ways even
+ more problemmatic than login recording. Some systems provide a
+ simple table of all users which we seek based on uid and retrieve a
+ relatively standard structure. Others record the same information in
+ a directory with a separate file, and others don't record the
+ information separately at all. For systems in the latter category,
+ we look backwards in the wtmp or wtmpx file for the last login entry
+ for our user. Naturally this is slower and on busy systems could
+ incur a significant performance penalty.
+
+ Calling the new code
+ --------------------
+
+ In OpenSSH all login recording and retrieval is performed in
+ login.c. Here you'll find working examples. Also, in the logintest.c
+ program there are more examples.
+
+ Internal handler calling method
+ -------------------------------
+
+ When a call is made to login_login() or login_logout(), both
+ routines set a struct logininfo flag defining which action (log in,
+ or log out) is to be taken. They both then call login_write(), which
+ calls whichever of the many structure-specific handlers autoconf
+ selects for the local system.
+
+ The handlers themselves handle system data structure specifics. Both
+ struct utmp and struct utmpx have utility functions (see
+ construct_utmp*()) to try to make it simpler to add extra systems
+ that introduce new features to either structure.
+
+ While it may seem terribly wasteful to replicate so much similar
+ code for each method, experience has shown that maintaining code to
+ write both struct utmp and utmpx in one function, whilst maintaining
+ support for all systems whether they have library support or not, is
+ a difficult and time-consuming task.
+
+ Lastlog support proceeds similarly. Functions login_get_lastlog()
+ (and its OpenSSH-tuned friend login_get_lastlog_time()) call
+ getlast_entry(), which tries one of three methods to find the last
+ login time. It uses local system lastlog support if it can,
+ otherwise it tries wtmp or wtmpx before giving up and returning 0,
+ meaning "tilt".
+
+ Maintenance
+ -----------
+
+ In many cases it's possible to tweak autoconf to select the correct
+ methods for a particular platform, either by improving the detection
+ code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
+ symbols for the platform.
+
+ Use logintest to check which symbols are defined before modifying
+ configure.in and loginrec.c. (You have to build logintest yourself
+ with 'make logintest' as it's not built by default.)
+
+ Otherwise, patches to the specific method(s) are very helpful!
+
+*/
+
/**
** TODO:
- ** sockaddr_* stuff isn't finished
+ ** homegrown ttyslot()q
+ ** test, test, test
**
** Platform status:
** ----------------
@@ -66,19 +166,28 @@
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_PWD_H
-# include <pwd.h>
+# include <pwd.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
# include <time.h>
#endif
+#if HAVE_UTMP_H
+# include <utmp.h>
+#endif
+#if HAVE_UTMPX_H
+# include <utmpx.h>
+#endif
+#if HAVE_LASTLOG_H
+# include <lastlog.h>
+#endif
#include "ssh.h"
#include "xmalloc.h"
#include "loginrec.h"
-RCSID("$Id: loginrec.c,v 1.2 2000/06/03 16:18:19 andre Exp $");
+RCSID("$Id: loginrec.c,v 1.3 2000/06/04 17:07:49 andre Exp $");
/**
@@ -86,13 +195,11 @@
**/
#if HAVE_UTMP_H
-# include <utmp.h>
void set_utmp_time(struct logininfo *li, struct utmp *ut);
void construct_utmp(struct logininfo *li, struct utmp *ut);
#endif
#ifdef HAVE_UTMPX_H
-# include <utmpx.h>
void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
void construct_utmpx(struct logininfo *li, struct utmpx *ut);
#endif
@@ -114,169 +221,128 @@
** platform-independent login functions
**/
+/* Record a login */
+int
+login_login (struct logininfo *li)
+{
+ li->type = LTYPE_LOGIN;
+ return login_write(li);
+}
+
+
+/* Record a logout */
+int
+login_logout(struct logininfo *li)
+{
+ li->type = LTYPE_LOGOUT;
+ return login_write(li);
+}
+
+
+/* Retrieve the last login time for a user (or fake on from wtmp/wtmpx) */
+unsigned int
+login_get_lastlog_time(const int uid)
+{
+ struct logininfo li;
+
+ login_get_lastlog(&li, uid);
+ return li.tv_sec;
+}
+
+/* Retrieve a lastlog entry (or fake one from wtmp/wtmpx) */
+struct logininfo *
+login_get_lastlog(struct logininfo *li, const int uid)
+{
+ memset(li, '\0', sizeof(struct logininfo));
+ li->uid = uid;
+ if (getlast_entry(li))
+ return li;
+ else
+ return 0;
+}
+
+
/* login_alloc_entry() - allocate and initialise a logininfo */
-struct logininfo *login_alloc_entry(int pid, const char *username,
- const char *hostname,
- const char *line) {
+struct
+logininfo *login_alloc_entry(int pid, const char *username,
+ const char *hostname, const char *line)
+{
struct logininfo *newli;
newli = (struct logininfo *) xmalloc (sizeof(struct logininfo));
-
- if (login_init_entry(newli, pid, username, hostname, line))
- return newli;
- else
- return 0; /* fail */
-} /* login_alloc_entry() */
+ (void)login_init_entry(newli, pid, username, hostname, line);
+ return newli;
+}
-/* login_free_entry() - free struct memory (duh) */
-void login_free_entry(struct logininfo *li) {
- if (li && (li->line[0] != '\0'))
- free ((void *)li);
- else
- log("login_free_entry: attempt to free invalid entry (warning)");
-} /* login_free_entry() */
+/* login_free_entry() - free struct memory (trivial) */
+void
+login_free_entry(struct logininfo *li)
+{
+ xfree(li);
+}
+
/* login_init_entry() - initialise a struct logininfo */
-int login_init_entry(struct logininfo *li,
- int pid, const char *username,
- const char *hostname, const char *line) {
-
+int
+login_init_entry(struct logininfo *li, int pid, const char *username,
+ const char *hostname, const char *line)
+{
/* zero the structure */
memset(li, 0, sizeof(struct logininfo));
- /* progname should be set outside this call */
- /* type stays null by default */
- login_set_pid(li, pid);
+ li->pid = pid;
/* set the line information */
- login_set_line(li, line);
- login_set_username(li, username);
- login_set_hostname(li, hostname);
- /* exit status and termination stay null by default */
- login_set_current_time(li);
- /* sockaddr_* stuff must be set separately (for now) */
- return 1;
-} /* login_init_entry() */
-
-
-void
-login_set_progname(struct logininfo *li, const char *progname) {
- memset(li->progname, '\0', sizeof(li->progname));
- if (progname)
- strlcpy(li->progname, progname, sizeof(li->progname));
- else
- li->progname[0] = '\0'; /* set to null */
-}
-
-void
-login_set_type(struct logininfo *li, int type) {
- li->type = type;
-}
-
-void
-login_set_pid(struct logininfo *li, int pid) {
- if (!pid)
- li->pid = (int)getpid();
- else
- li->pid = pid;
-}
-
-void
-login_set_uid(struct logininfo *li, int uid) {
- struct passwd *pw;
-
- li->uid = uid;
- /* now update the username */
- pw = getpwuid(uid);
- strlcpy(li->username, pw->pw_name, sizeof(li->username));
-}
-
-void
-login_set_line(struct logininfo *li, const char *line) {
- if (line) {
- /* canonical form is the full name, i.e. including '/dev' */
+ if (line)
line_fullname(li->line, line, sizeof(li->line));
- } else
- li->line[0] = '\0';
-}
-void
-login_set_username(struct logininfo *li, const char *username) {
- struct passwd *pw;
-
- if (!username) {
- li->username[0] = '\0';
- li->uid = -1; /* hmm... */
- } else {
+ if (username)
strlcpy(li->username, username, sizeof(li->username));
- /* now update the uid */
- pw = getpwnam(username);
- li->uid = pw->pw_uid;
- }
-}
-
-
-void
-login_set_hostname(struct logininfo *li, const char *hostname) {
- if (hostname) { /* can be null */
+ if (hostname)
strlcpy(li->hostname, hostname, sizeof(li->hostname));
- }
+ return 1;
}
void
-login_set_exitstatus(struct logininfo *li,
- int exit, int termination) {
- /* FIXME: (ATL) And? */
-}
-
-
-/* tv_usec should be null on systems without struct timeval */
-void
-login_set_time(struct logininfo *li,
- unsigned int tv_sec, unsigned int tv_usec) {
- li->tv_sec = tv_sec;
- li->tv_usec = tv_usec;
-}
-
-
-void
-login_set_current_time(struct logininfo *li) {
+login_set_current_time(struct logininfo *li)
+{
#ifdef HAVE_SYS_TIME_H
struct timeval tv;
gettimeofday(&tv, NULL);
li->tv_sec = tv.tv_sec ; li->tv_usec = tv.tv_usec;
#else
- time_t t = time(0);
-
- li->tv_sec = t; li->tv_usec = 0;
+ time_t tm = time(0);
+
+ li->tv_sec = tm; li->tv_usec = 0;
#endif
}
+
+/* copy a sockaddr_* into our logininfo */
void
-login_set_ip4(struct logininfo *li,
- const struct sockaddr_in *sa_in4) {
- memcpy((void *)&(li->hostaddr.sa_in4), (const void *)sa_in4,
- sizeof(struct sockaddr_in));
+login_set_addr(struct logininfo *li, const struct sockaddr *sa,
+ const unsigned int sa_size)
+{
+ unsigned int bufsize = sa_size;
+
+ /* make sure we don't overrun our union */
+ if (sizeof(li->hostaddr) < sa_size)
+ bufsize = sizeof(li->hostaddr);
+
+ memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
}
-#ifdef HAVE_IP6
-void
-login_set_ip6(struct logininfo *li,
- const struct sockaddr_in6 *sa_in6) {
- memcpy((void *)&(li->hostaddr.sa_in4), (const void *)sa_in6,
- sizeof(struct sockaddr_in6));
-}
-#endif
-/*
- * record the entry
- */
+/**
+ ** login_write: Call low-level recording functions based on autoconf
+ ** results
+ **/
int
-login_write (struct logininfo *li) {
-
+login_write (struct logininfo *li)
+{
if ((int)geteuid() != 0) {
log("Attempt to write login records by non-root user (aborting)");
return 1;
@@ -306,97 +372,75 @@
return 0;
}
-int
-login_login (struct logininfo *li) {
- li->type = LTYPE_LOGIN;
- return login_write(li);
-}
-
-int
-login_logout(struct logininfo *li) {
- li->type = LTYPE_LOGOUT;
- return login_write(li);
-}
-
-int
-login_log_entry(struct logininfo *li) {
- return login_write(li);
-}
-
-
-unsigned int
-login_getlasttime_name(const char *username) {
- struct logininfo li;
-
- memset(&li, '\0', sizeof(li));
- login_set_username(&li, username);
- if (getlast_entry(&li))
- return li.tv_sec;
- else
- return 0;
-} /* login_getlasttime_name() */
-
-
-unsigned int
-login_getlasttime_uid(const int uid) {
- struct logininfo li;
-
- memset(&li, '\0', sizeof(li));
- login_set_uid(&li, uid);
- if (getlast_entry(&li))
- return li.tv_sec;
- else
- return 0;
-} /* login_getlasttime_uid() */
-
-
-struct logininfo *
-login_getlastentry_name(struct logininfo *li,
- const char *username) {
- login_set_username(li, username);
- if (getlast_entry(li))
- return li;
- else
- return 0;
-} /* login_getlastentry_name() */
-
-struct logininfo *
-login_getlastentry_uid(struct logininfo *li,
- const int uid) {
- login_set_uid(li, uid);
- if (getlast_entry(li))
- return li;
- else
- return 0;
-} /* login_getlastentry_uid() */
-
/**
- ** 'line' string utility functions
+ ** getlast_entry: Call low-level functions to retrieve the last login
+ ** time.
**/
+/* take the uid in li and return the last login time */
+int
+getlast_entry(struct logininfo *li)
+{
+#ifdef USE_LASTLOG
+ if (lastlog_get_entry(li))
+ return 1;
+ else
+ return 0;
+#else
+ /* !USE_LASTLOG */
+
+ /* Try to retrieve the last login time from wtmp */
+# if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
+ /* retrieve last login time from utmp */
+ if (wtmp_get_entry(li))
+ return 1;
+ else
+ return 0;
+# else
+
+ /* If wtmp isn't available, try wtmpx */
+
+# if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
+ /* retrieve last login time from utmpx */
+ if (wtmpx_get_entry(li))
+ return 1;
+ else
+ return 0;
+# else
+
+ /* Give up: No means of retrieving last login time */
+ return 0;
+# endif
+# endif
+#endif
+/* USE_LASTLOG */
+}
+
+
+
/*
- * process the 'line' string into three forms:
+ * 'line' string utility functions
+ *
+ * These functions process the 'line' string into one of three forms:
+ *
* 1. The full filename (including '/dev')
* 2. The stripped name (excluding '/dev')
- * 3. The abbreviated name (e.g. /dev/ttyp00
+ * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
+ * /dev/pts/1 -> ts/1 )
*
* Form 3 is used on some systems to identify a .tmp.? entry when
* attempting to remove it. Typically both addition and removal is
- * performed by one application - say, sshd - so as long as the
- * choice uniquely identifies a terminal and is the same at login and
- * logout time, we're in good shape.
- *
- * NOTE: None of these calls actually allocate any memory -
- * since their target is probably a structure, they don't
- * need to.
+ * performed by one application - say, sshd - so as long as the choice
+ * uniquely identifies a terminal it's ok.
*/
-/* add the leading '/dev/' if it doesn't exist
- * make sure dst has enough space, if not just copy src (ugh) */
+/* line_fullname(): add the leading '/dev/' if it doesn't exist make
+ * sure dst has enough space, if not just copy src (ugh) */
char *
-line_fullname(char *dst, const char *src, int dstsize) {
+line_fullname(char *dst, const char *src, int dstsize)
+{
memset(dst, '\0', dstsize);
if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
strlcpy(dst, src, dstsize);
@@ -407,50 +451,48 @@
return dst;
}
-/* strip the leading '/dev' if it exists, return dst */
+
+/* line_stripname(): strip the leading '/dev' if it exists, return dst */
char *
-line_stripname(char *dst, const char *src, int dstsize) {
+line_stripname(char *dst, const char *src, int dstsize)
+{
memset(dst, '\0', dstsize);
if (strncmp(src, "/dev/", 5) == 0)
strlcpy(dst, &src[5], dstsize);
else
strlcpy(dst, src, dstsize);
return dst;
-} /* stripdev() */
+}
+
-/* return the abbreviated (usually four-character) form *
- * simple algorithm for making name:
- * - first character is 'L' (arbitrary - 'lib(L)ogin' :-) )
- * - remaining n characters are last n characters of line
- * This is good for up to 999 ptys, I hope that's enough...
- */
+/* line_abbrevname(): Return the abbreviated (usually four-character)
+ * form of the line (Just use the last <dstsize> characters of the
+ * full name.)
+ *
+ * NOTE: use strncpy because we do NOT necessarily want zero
+ * termination */
char *
line_abbrevname(char *dst, const char *src, int dstsize) {
memset(dst, '\0', dstsize);
- dst[0]='L';
- strlcpy(dst+1, &src[strlen(src)-(dstsize)], dstsize);
+ src += (strlen(src) - dstsize);
+ strncpy(dst, src, dstsize); /* note: _don't_ change this to strlcpy */
return dst;
}
/**
** utmp utility functions
+ **
+ ** These functions manipulate struct utmp, taking system differences
+ ** into account.
**/
#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
-#ifdef HAVE_UTMP_H
-# include <utmp.h>
-#endif
-#ifdef USE_TIMEVAL
-# include <sys/time.h>
-#else
-# include <time.h>
-#endif
-
/* build the utmp structure */
void
-set_utmp_time(struct logininfo *li, struct utmp *ut) {
+set_utmp_time(struct logininfo *li, struct utmp *ut)
+{
#ifdef HAVE_TV_IN_UTMP
ut->ut_tv.tv_sec = li->tv_sec;
ut->ut_tv.tv_usec = li->tv_usec;
@@ -461,17 +503,18 @@
#endif
}
+
void
construct_utmp(struct logininfo *li,
- struct utmp *ut) {
+ struct utmp *ut)
+{
memset(ut, '\0', sizeof(struct utmp));
-
#ifdef HAVE_ID_IN_UTMP
line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
#endif
#ifdef HAVE_TYPE_IN_UTMP
- /* this is done here to keep utmp constants out of login.h */
+ /* This is done here to keep utmp constants out of login.h */
switch (li->type) {
case LTYPE_LOGIN:
ut->ut_type = USER_PROCESS;
@@ -492,32 +535,30 @@
strlcpy(ut->ut_host, li->hostname, sizeof(ut->ut_host));
#endif
#ifdef HAVE_ADDR_IN_UTMP
- /* !!! not supported yet (can't see its big use either) */
-#endif
-
-} /* construct_utmp() */
+ /* this is just a 32-bit IP address */
+ if (li->hostaddr.sa.sa_family == AF_INET)
+ ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
+#endif
+}
#endif
/* USE_UTMP || USE_WTMP || USE_LOGIN */
+
+
/**
** utmpx utility functions
+ **
+ ** These functions manipulate struct utmpx, accounting for system
+ ** variations.
**/
#if defined(USE_UTMPX) || defined (USE_WTMPX)
-#ifdef HAVE_UTMPX_H
-# include <utmpx.h>
-#endif
-#ifdef USE_TIMEVAL
-# include <sys/time.h>
-#else
-# include <time.h>
-#endif
-
/* build the utmpx structure */
void
-set_utmpx_time(struct logininfo *li, struct utmpx *utx) {
+set_utmpx_time(struct logininfo *li, struct utmpx *utx)
+{
#ifdef HAVE_TV_IN_UTMPX
utx->ut_tv.tv_sec = li->tv_sec;
utx->ut_tv.tv_usec = li->tv_usec;
@@ -528,11 +569,11 @@
#endif
}
-void
-construct_utmpx(struct logininfo *li,
- struct utmpx *utx) {
- memset(utx, '\0', sizeof(struct utmpx));
+void
+construct_utmpx(struct logininfo *li, struct utmpx *utx)
+{
+ memset(utx, '\0', sizeof(struct utmpx));
line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
/* this is done here to keep utmp constants out of loginrec.h */
@@ -544,7 +585,6 @@
utx->ut_type = DEAD_PROCESS;
break;
}
-
utx->ut_pid = li->pid;
line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
strlcpy(utx->ut_name, li->username, sizeof(utx->ut_name));
@@ -553,13 +593,13 @@
strlcpy(utx->ut_host, li->hostname, sizeof(utx->ut_host));
#endif
#ifdef HAVE_ADDR_IN_UTMPX
- /* !!! not supported yet (some issues with types of addresses) */
+ /* FIXME: (ATL) not supported yet */
#endif
#ifdef HAVE_SYSLEN_IN_UTMPX
/* this is safe because of the extra nulls in logininfo */
utx->ut_syslen = strlen(li->hostname);
#endif
-} /* construct_utmpx() */
+}
#endif
/* USE_UTMPX || USE_WTMPX */
@@ -567,15 +607,13 @@
/**
- ** utmp functions
+ ** Low-level utmp functions
**/
/* FIXME: (ATL) utmp_write_direct needs testing */
#ifdef USE_UTMP
-#include <utmp.h>
-
/* if we can, use pututline() etc. */
#if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
defined(HAVE_PUTUTLINE)
@@ -586,8 +624,8 @@
/* write a utmp entry with the system's help (pututline() and pals) */
#ifdef UTMP_USE_LIBRARY
static int
-utmp_write_library(struct logininfo *li, struct utmp *ut) {
-
+utmp_write_library(struct logininfo *li, struct utmp *ut)
+{
setutent();
pututline(ut);
@@ -595,15 +633,15 @@
endutent();
#endif
return 1;
-} /* utmp_write_library() */
+}
#else
/* write a utmp entry direct to the file */
-/* This code is a slightly modification of code in OpenBSD's login.c
- * (in libutil) and so is subject to the OpenBSD Licensing terms. */
+/* This is a slightly modification of code in OpenBSD's login.c */
static int
-utmp_write_direct(struct logininfo *li, struct utmp *ut) {
+utmp_write_direct(struct logininfo *li, struct utmp *ut)
+{
struct utmp old_ut;
register int fd;
int tty;
@@ -633,17 +671,16 @@
return 1;
} else
return 0;
-} /* utmp_write_direct() */
-
+}
#endif /* UTMP_USE_LIBRARY */
static int
-utmp_perform_login(struct logininfo *li) {
+utmp_perform_login(struct logininfo *li)
+{
struct utmp ut;
construct_utmp(li, &ut);
-
#ifdef UTMP_USE_LIBRARY
if (!utmp_write_library(li, &ut)) {
log("utmp_perform_login: utmp_write_library() failed");
@@ -656,11 +693,12 @@
}
#endif
return 1;
-} /* utmp_perform_login() */
+}
static int
-utmp_perform_logout(struct logininfo *li) {
+utmp_perform_logout(struct logininfo *li)
+{
struct utmp ut;
memset(&ut, '\0', sizeof(ut));
@@ -681,12 +719,12 @@
#endif
return 1;
-} /* utmp_perform_logout() */
+}
int
-utmp_write_entry(struct logininfo *li) {
-
+utmp_write_entry(struct logininfo *li)
+{
switch(li->type) {
case LTYPE_LOGIN:
return utmp_perform_login(li);
@@ -698,7 +736,7 @@
log("utmp_write_entry: invalid type field");
return 0;
}
-} /* utmp_write_entry() */
+}
#endif
@@ -706,14 +744,12 @@
/**
- ** utmpx functions
+ ** Low-level utmpx functions
**/
/* not much point if we don't want utmpx entries */
#ifdef USE_UTMPX
-#include <utmpx.h>
-
/* if we have the wherewithall, use pututxline etc. */
#if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) \
&& defined(HAVE_PUTUTXLINE)
@@ -724,8 +760,8 @@
/* write a utmpx entry with the system's help (pututxline() and pals) */
#ifdef UTMPX_USE_LIBRARY
static int
-utmpx_write_library(struct logininfo *li, struct utmpx *utx) {
-
+utmpx_write_library(struct logininfo *li, struct utmpx *utx)
+{
setutxent();
pututxline(utx);
@@ -733,7 +769,7 @@
endutxent();
#endif
return 1;
-} /* utmpx_write_library() */
+}
#else
/* UTMPX_USE_LIBRARY */
@@ -741,21 +777,21 @@
/* write a utmp entry direct to the file */
static int
-utmpx_write_direct(struct logininfo *li, struct utmpx *utx) {
-
+utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
+{
log("utmpx_write_direct: not implemented!");
return 0;
- } /* utmpx_write_direct() */
+}
#endif
/* UTMPX_USE_LIBRARY */
static int
-utmpx_perform_login(struct logininfo *li) {
+utmpx_perform_login(struct logininfo *li)
+{
struct utmpx utx;
construct_utmpx(li, &utx);
-
#ifdef UTMPX_USE_LIBRARY
if (!utmpx_write_library(li, &utx)) {
log("utmpx_perform_login: utmp_write_library() failed");
@@ -768,11 +804,12 @@
}
#endif
return 1;
-} /* utmpx_perform_login() */
+}
static int
-utmpx_perform_logout(struct logininfo *li) {
+utmpx_perform_logout(struct logininfo *li)
+{
struct utmpx utx;
memset(&utx, '\0', sizeof(utx));
@@ -790,14 +827,13 @@
#else
utmpx_write_direct(li, &utx);
#endif
-
return 1;
-} /* utmpx_perform_logout() */
+}
int
-utmpx_write_entry(struct logininfo *li) {
-
+utmpx_write_entry(struct logininfo *li)
+{
switch(li->type) {
case LTYPE_LOGIN:
return utmpx_perform_login(li);
@@ -807,7 +843,7 @@
log("utmpx_write_entry: invalid type field");
return 0;
}
-} /* utmpx_write_entry() */
+}
#endif
@@ -815,18 +851,16 @@
/**
- ** wtmp functions
+ ** Low-level wtmp functions
**/
#ifdef USE_WTMP
-# include <utmp.h>
-
/* write a wtmp entry direct to the end of the file */
-/* This code is a slight modification of code in OpenBSD's logwtmp.c
- * (in libutil) and so is subject to the OpenBSD licensing terms */
+/* This is a slight modification of code in OpenBSD's logwtmp.c */
static int
-wtmp_write(struct logininfo *li, struct utmp *ut) {
+wtmp_write(struct logininfo *li, struct utmp *ut)
+{
struct stat buf;
int fd, ret = 1;
@@ -835,8 +869,7 @@
WTMP_FILE, strerror(errno));
return 0;
}
-
- if (fstat(fd, &buf) == 0)
+ if (fstat(fd, &buf) == 0)
if (write(fd, (char *)ut, sizeof(struct utmp)) !=
sizeof(struct utmp)) {
ftruncate(fd, buf.st_size);
@@ -845,23 +878,22 @@
ret = 0;
}
(void)close(fd);
-
return ret;
-} /* wtmp_write() */
-
+}
static int
-wtmp_perform_login(struct logininfo *li) {
+wtmp_perform_login(struct logininfo *li){
struct utmp ut;
construct_utmp(li, &ut);
return wtmp_write(li, &ut);
-} /* wtmp_perform_login() */
+}
static int
-wtmp_perform_logout(struct logininfo *li) {
+wtmp_perform_logout(struct logininfo *li)
+{
struct utmp ut;
construct_utmp(li, &ut);
@@ -877,12 +909,12 @@
memset(&(ut.ut_addr), '\0', sizeof(ut.ut_addr));
#endif
return wtmp_write(li, &ut);
-} /* wtmp_perform_logout() */
+}
int
-wtmp_write_entry(struct logininfo *li) {
-
+wtmp_write_entry(struct logininfo *li)
+{
switch(li->type) {
case LTYPE_LOGIN:
return wtmp_perform_login(li);
@@ -892,12 +924,12 @@
log("wtmp_write_entry: invalid type field");
return 0;
}
-} /* wtmp_write_entry() */
-
+}
int
-wtmp_get_entry(struct logininfo *li) {
+wtmp_get_entry(struct logininfo *li)
+{
struct stat st;
struct utmp ut;
int fd;
@@ -907,14 +939,12 @@
WTMP_FILE, strerror(errno));
return 0;
}
-
- if (fstat(fd, &st) != 0) {
+ if (fstat(fd, &st) != 0) {
log("wtmp_get_entry: couldn't stat %s: %s",
WTMP_FILE, strerror(errno));
close(fd);
return 0;
}
-
(void)lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END);
do {
@@ -924,7 +954,6 @@
close (fd);
return 0;
}
-
/* Logouts are recorded as a blank username on a particular line.
* So, we just need to find the username in struct utmp */
if ( strncmp(li->username, ut.ut_user, 8) == 0 ) {
@@ -948,7 +977,7 @@
} while (li->tv_sec == 0);
return 1;
-} /* wtmp_get_entry() */
+}
#endif
@@ -956,18 +985,16 @@
/**
- ** wtmpx functions
+ ** Low-level wtmpx functions
**/
#ifdef USE_WTMPX
-# include <utmpx.h>
-
/* write a wtmpx entry direct to the end of the file */
-/* This code is a slight modification of code in OpenBSD's logwtmp.c
- * (in libutil) and so is subject to the OpenBSD licensing terms */
+/* This is a slight modification of code in OpenBSD's logwtmp.c */
static int
-wtmpx_write(struct logininfo *li, struct utmpx *utx) {
+wtmpx_write(struct logininfo *li, struct utmpx *utx)
+{
struct stat buf;
int fd, ret = 1;
@@ -988,21 +1015,22 @@
(void)close(fd);
return ret;
-} /* wtmpx_write() */
-
+}
static int
-wtmpx_perform_login(struct logininfo *li) {
+wtmpx_perform_login(struct logininfo *li)
+{
struct utmpx utx;
construct_utmpx(li, &utx);
return wtmpx_write(li, &utx);
-} /* wtmpx_perform_login() */
+}
static int
-wtmpx_perform_logout(struct logininfo *li) {
+wtmpx_perform_logout(struct logininfo *li)
+{
struct utmpx utx;
construct_utmpx(li, &utx);
@@ -1019,12 +1047,12 @@
#endif
return wtmpx_write(li, &utx);
-} /* wtmpx_perform_logout() */
+}
int
-wtmpx_write_entry(struct logininfo *li) {
-
+wtmpx_write_entry(struct logininfo *li)
+{
switch(li->type) {
case LTYPE_LOGIN:
return wtmpx_perform_login(li);
@@ -1034,12 +1062,12 @@
log("wtmpx_write_entry: invalid type field");
return 0;
}
-} /* wtmpx_write_entry() */
-
+}
int
-wtmpx_get_entry(struct logininfo *li) {
+wtmpx_get_entry(struct logininfo *li)
+{
struct stat st;
struct utmpx utx;
int fd;
@@ -1049,14 +1077,12 @@
WTMPX_FILE, strerror(errno));
return 0;
}
-
- if (fstat(fd, &st) != 0) {
+ if (fstat(fd, &st) != 0) {
log("wtmpx_get_entry: couldn't stat %s: %s",
WTMP_FILE, strerror(errno));
close(fd);
return 0;
}
-
(void)lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END);
do {
@@ -1066,7 +1092,6 @@
close (fd);
return 0;
}
-
/* Logouts are recorded as a blank username on a particular line.
* So, we just need to find the username in struct utmpx */
if ( strncmp(li->username, utx.ut_user, 8) == 0 ) {
@@ -1089,8 +1114,7 @@
}
} while (li->tv_sec == 0);
return 1;
-} /* wtmpx_get_entry() */
-
+}
#endif
@@ -1099,25 +1123,14 @@
/**
- ** libutil login() functions
+ ** Low-level libutil login() functions
**/
#ifdef USE_LOGIN
-#ifdef HAVE_UTMP_H
-# include <utmp.h>
-#endif
-#ifdef HAVE_UTIL_H
-# include <util.h>
-#endif
-#ifdef USE_TIMEVAL
-# include <sys/time.h>
-#else
-# include <time.h>
-#endif
-
static int
-syslogin_perform_login(struct logininfo *li) {
+syslogin_perform_login(struct logininfo *li)
+{
struct utmp *ut;
if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) {
@@ -1128,11 +1141,12 @@
login(ut);
return 1;
-} /* syslogin_perform_login() */
+}
+
static int
-syslogin_perform_logout(struct logininfo *li) {
-
+syslogin_perform_logout(struct logininfo *li)
+{
#ifdef HAVE_LOGOUT
char line[8];
@@ -1150,13 +1164,12 @@
* so they should all be there, but... */
#endif
return 1;
-} /* syslogin_perform_logout() */
-
+}
int
-syslogin_write_entry(struct logininfo *li) {
-
+syslogin_write_entry(struct logininfo *li)
+{
switch (li->type) {
case LTYPE_LOGIN:
return syslogin_perform_login(li);
@@ -1166,7 +1179,7 @@
log("syslogin_write_entry: Invalid type field");
return 0;
}
-} /* utmp_write_entry() */
+}
#endif
@@ -1176,23 +1189,14 @@
/**
- ** lastlog functions
+ ** Low-level lastlog functions
**/
#ifdef USE_LASTLOG
-#ifdef HAVE_LASTLOG_H
-# include <lastlog.h>
-#else
-# if !defined(USE_UTMP) && !defined(USE_WTMP)
-# include <utmp.h>
-# endif
-#endif
-
-
static void
-lastlog_construct(struct logininfo *li,
- struct lastlog *last) {
+lastlog_construct(struct logininfo *li, struct lastlog *last)
+{
/* clear the structure */
memset(last, '\0', sizeof(struct lastlog));
@@ -1200,7 +1204,7 @@
sizeof(last->ll_line));
strlcpy(last->ll_host, li->hostname, sizeof(last->ll_host));
last->ll_time = li->tv_sec;
-} /* lastlog_construct() */
+}
#define LL_FILE 1
@@ -1208,7 +1212,8 @@
#define LL_OTHER 3
static int
-lastlog_filetype(char *filename) {
+lastlog_filetype(char *filename)
+{
struct stat st;
if ( stat(LASTLOG_FILE, &st) != 0) {
@@ -1216,20 +1221,19 @@
LASTLOG_FILE, strerror(errno));
return 0;
}
-
if (S_ISDIR(st.st_mode))
return LL_DIR;
else if (S_ISREG(st.st_mode))
return LL_FILE;
else
return LL_OTHER;
-} /* lastlog_filetype() */
+}
/* open the file (using filemode) and seek to the login entry */
static int
-lastlog_openseek(struct logininfo *li, int *fd, int filemode) {
-
+lastlog_openseek(struct logininfo *li, int *fd, int filemode)
+{
off_t offset;
int type;
char lastlog_file[1024];
@@ -1255,7 +1259,6 @@
lastlog_file, strerror(errno));
return 0;
}
-
/* find this uid's offset in the lastlog file */
offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
@@ -1265,10 +1268,11 @@
return 0;
}
return 1;
-} /* lastlog_openseek() */
+}
static int
-lastlog_perform_login(struct logininfo *li) {
+lastlog_perform_login(struct logininfo *li)
+{
struct lastlog last;
int fd;
@@ -1286,12 +1290,12 @@
return 1;
} else
return 0;
-} /* lastlog_perform_login() */
+}
int
-lastlog_write_entry(struct logininfo *li) {
-
+lastlog_write_entry(struct logininfo *li)
+{
switch(li->type) {
case LTYPE_LOGIN:
return lastlog_perform_login(li);
@@ -1299,22 +1303,21 @@
log("lastlog_write_entry: Invalid type field");
return 0;
}
-} /* lastlog_write_entry() */
-
+}
static void
-lastlog_populate_entry(struct logininfo *li,
- struct lastlog *last) {
+lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
+{
line_fullname(li->line, last->ll_line, sizeof(li->line));
strlcpy(li->hostname, last->ll_host, sizeof(li->hostname));
li->tv_sec = last->ll_time;
-} /* lastlog_populate_entry() */
-
+}
int
-lastlog_get_entry(struct logininfo *li) {
+lastlog_get_entry(struct logininfo *li)
+{
struct lastlog last;
int fd;
@@ -1328,58 +1331,10 @@
lastlog_populate_entry(li, &last);
return 1;
}
-
} else
return 0;
-} /* lastlog_get_entry() */
+}
#endif
/* USE_LASTLOG */
-
-
-/**
- ** lastlog retrieval functions
- **/
-
-/* take the uid in li and return the last login time */
-int
-getlast_entry(struct logininfo *li) {
-
-#ifdef USE_LASTLOG
- if (lastlog_get_entry(li))
- return 1;
- else
- return 0;
-#else
- /* !USE_LASTLOG */
- /* Try to retrieve the last login time from another source */
-
-# if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
-
- /* retrieve last login time from utmp */
- if (wtmp_get_entry(li))
- return 1;
- else
- return 0;
-
-# else
-# if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
-
- /* retrieve last login time from utmpx */
- if (wtmpx_get_entry(li))
- return 1;
- else
- return 0;
-
-# else
-
- /* no means of retrieving last login time */
- return 0;
-# endif
-# endif
-
-#endif
- /* USE_LASTLOG */
-
-}