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Support for utmp, wtmp and lastlog. Probably not terribly portable

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as yet, but seems to work plausibly on Linux.

[originally from svn r2058]
This commit is contained in:
Simon Tatham
2002-10-15 12:29:52 +00:00
parent c809640aba
commit 6118021749
3 changed files with 162 additions and 4 deletions
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150
unix/pty.c
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@ -10,6 +10,9 @@
#include <fcntl.h>
#include <termios.h>
#include <grp.h>
#include <utmp.h>
#include <pwd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
@ -23,9 +26,26 @@
#define TRUE 1
#endif
#ifndef UTMP_FILE
#define UTMP_FILE "/var/run/utmp"
#endif
#ifndef WTMP_FILE
#define WTMP_FILE "/var/log/wtmp"
#endif
#ifndef LASTLOG_FILE
#ifdef _PATH_LASTLOG
#define LASTLOG_FILE _PATH_LASTLOG
#else
#define LASTLOG_FILE "/var/log/lastlog"
#endif
#endif
int pty_master_fd;
static int pty_child_pid;
static sig_atomic_t pty_child_dead;
#ifndef OMIT_UTMP
static struct utmp utmp_entry;
#endif
char **pty_argv;
int pty_child_is_dead(void)
@ -35,6 +55,81 @@ int pty_child_is_dead(void)
static void pty_size(void);
static void setup_utmp(char *ttyname)
{
#ifndef OMIT_UTMP
#ifdef HAVE_LASTLOG
struct lastlog lastlog_entry;
FILE *lastlog;
#endif
struct passwd *pw;
char *location = get_x_display();
FILE *wtmp;
pw = getpwuid(getuid());
memset(&utmp_entry, 0, sizeof(utmp_entry));
utmp_entry.ut_type = USER_PROCESS;
utmp_entry.ut_pid = getpid();
strncpy(utmp_entry.ut_line, ttyname+5, lenof(utmp_entry.ut_line));
strncpy(utmp_entry.ut_id, ttyname+8, lenof(utmp_entry.ut_id));
strncpy(utmp_entry.ut_user, pw->pw_name, lenof(utmp_entry.ut_user));
strncpy(utmp_entry.ut_host, location, lenof(utmp_entry.ut_host));
time(&utmp_entry.ut_time);
#if defined HAVE_PUTUTLINE
utmpname(UTMP_FILE);
setutent();
pututline(&utmp_entry);
endutent();
#endif
if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) {
fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp);
fclose(wtmp);
}
#ifdef HAVE_LASTLOG
memset(&lastlog_entry, 0, sizeof(lastlog_entry));
strncpy(lastlog_entry.ll_line, ttyname+5, lenof(lastlog_entry.ll_line));
strncpy(lastlog_entry.ll_host, location, lenof(lastlog_entry.ll_host));
time(&lastlog_entry.ll_time);
if ((lastlog = fopen(LASTLOG_FILE, "r+")) != NULL) {
fseek(lastlog, sizeof(lastlog_entry) * getuid(), SEEK_SET);
fwrite(&lastlog_entry, 1, sizeof(lastlog_entry), lastlog);
fclose(lastlog);
}
#endif
#endif
}
static void cleanup_utmp(void)
{
#ifndef OMIT_UTMP
FILE *wtmp;
utmp_entry.ut_type = DEAD_PROCESS;
memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user));
time(&utmp_entry.ut_time);
if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) {
fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp);
fclose(wtmp);
}
memset(utmp_entry.ut_line, 0, lenof(utmp_entry.ut_line));
utmp_entry.ut_time = 0;
#if defined HAVE_PUTUTLINE
utmpname(UTMP_FILE);
setutent();
pututline(&utmp_entry);
endutent();
#endif
#endif
}
static void sigchld_handler(int signum)
{
pid_t pid;
@ -44,6 +139,14 @@ static void sigchld_handler(int signum)
pty_child_dead = TRUE;
}
static void fatal_sig_handler(int signum)
{
signal(signum, SIG_DFL);
cleanup_utmp();
setuid(getuid());
raise(signum);
}
/*
* Called to set up the pty.
*
@ -107,6 +210,53 @@ static char *pty_init(char *host, int port, char **realhost, int nodelay)
strncpy(name, ptsname(pty_master_fd), FILENAME_MAX-1);
#endif
/*
* Trap as many fatal signals as we can in the hope of having
* the best chance to clean up utmp before termination.
*/
signal(SIGHUP, fatal_sig_handler);
signal(SIGINT, fatal_sig_handler);
signal(SIGQUIT, fatal_sig_handler);
signal(SIGILL, fatal_sig_handler);
signal(SIGABRT, fatal_sig_handler);
signal(SIGFPE, fatal_sig_handler);
signal(SIGPIPE, fatal_sig_handler);
signal(SIGALRM, fatal_sig_handler);
signal(SIGTERM, fatal_sig_handler);
signal(SIGSEGV, fatal_sig_handler);
signal(SIGUSR1, fatal_sig_handler);
signal(SIGUSR2, fatal_sig_handler);
#ifdef SIGBUS
signal(SIGBUS, fatal_sig_handler);
#endif
#ifdef SIGPOLL
signal(SIGPOLL, fatal_sig_handler);
#endif
#ifdef SIGPROF
signal(SIGPROF, fatal_sig_handler);
#endif
#ifdef SIGSYS
signal(SIGSYS, fatal_sig_handler);
#endif
#ifdef SIGTRAP
signal(SIGTRAP, fatal_sig_handler);
#endif
#ifdef SIGVTALRM
signal(SIGVTALRM, fatal_sig_handler);
#endif
#ifdef SIGXCPU
signal(SIGXCPU, fatal_sig_handler);
#endif
#ifdef SIGXFSZ
signal(SIGXFSZ, fatal_sig_handler);
#endif
#ifdef SIGIO
signal(SIGIO, fatal_sig_handler);
#endif
/* Also clean up utmp on normal exit. */
atexit(cleanup_utmp);
setup_utmp(name);
/*
* Fork and execute the command.
*/