goutmp/goutmp_linux.go
Russ Magee 74d785142e Fixed +build constraints
Signed-off-by: Russ Magee <rmagee@gmail.com>
2020-04-25 18:39:08 -07:00

132 lines
3.2 KiB
Go

// +build linux
// Golang bindings for basic login/utmp accounting
package goutmp
//#include <stdio.h>
//#include <stdlib.h>
//#include <sys/file.h>
//#include <string.h>
//#include <unistd.h>
//#include <stdint.h>
//#include <time.h>
//#include <pwd.h>
//
//#include <utmp.h>
//#include <lastlog.h>
//
//typedef char char_t;
//
//
//void pututmp(struct utmp* entry, char* uname, char* ptsname, char* host) {
// entry->ut_type = USER_PROCESS;
// entry->ut_pid = getpid();
// strcpy(entry->ut_line, ptsname + strlen("/dev/"));
//
// strcpy(entry->ut_id, ptsname + strlen("/dev/pts/"));
//
// entry->ut_time = time(NULL);
// strcpy(entry->ut_user, uname);
// strcpy(entry->ut_host, host);
// entry->ut_addr = 0;
// setutent();
// pututline(entry);
//}
//
//void unpututmp(struct utmp* entry) {
// entry->ut_type = DEAD_PROCESS;
// memset(entry->ut_line, 0, UT_LINESIZE);
// entry->ut_time = 0;
// memset(entry->ut_user, 0, UT_NAMESIZE);
// setutent();
// pututline(entry);
//
// endutent();
//}
//
//int putlastlogentry(int64_t t, int uid, char* line, char* host) {
// int retval = 0;
// FILE *f;
// struct lastlog l;
//
// strncpy(l.ll_line, line, UT_LINESIZE);
// l.ll_line[UT_LINESIZE-1] = '\0';
// strncpy(l.ll_host, host, UT_HOSTSIZE);
// l.ll_host[UT_HOSTSIZE-1] = '\0';
//
// l.ll_time = (time_t)t;
// //printf("l: ll_line '%s', ll_host '%s', ll_time %d\n", l.ll_line, l.ll_host, l.ll_time);
//
// /* Write lastlog entry at fixed offset (uid * sizeof(struct lastlog) */
// if( NULL != (f = fopen("/var/log/lastlog", "rw+")) ) {
// if( !fseek(f, (uid * sizeof(struct lastlog)), SEEK_SET) ) {
// int fd = fileno(f);
// if( write(fd, &l, sizeof(l)) == sizeof(l) ) {
// retval = 1;
// //int32_t stat = system("echo ---- lastlog ----; lastlog");
// }
// }
// fclose(f);
// }
// return retval;
//}
import "C"
import (
"fmt"
"net"
"os/user"
"strings"
"time"
)
// UtmpEntry wraps the C struct utmp
type UtmpEntry struct {
entry C.struct_utmp
}
// return remote client hostname or IP if host lookup fails
// addr is expected to be of the format given by net.Addr.String()
// eg., "127.0.0.1:80" or "[::1]:80"
func GetHost(addr string) (h string) {
if !strings.Contains(addr, "[") {
h = strings.Split(addr, ":")[0]
} else {
h = strings.Split(strings.Split(addr, "[")[1], "]")[0]
}
hList, e := net.LookupAddr(h)
//fmt.Printf("lookupAddr:%v\n", hList)
if e == nil {
h = hList[0]
}
return
}
// Put a username and the originating host/IP to utmp
func Put_utmp(user, ptsName, host string) UtmpEntry {
var entry UtmpEntry
//log.Println("Put_utmp:host ", host, " user ", user)
C.pututmp(&entry.entry, C.CString(user), C.CString(ptsName), C.CString(host))
return entry
}
// Remove a username/host entry from utmp
func Unput_utmp(entry UtmpEntry) {
C.unpututmp(&entry.entry)
}
// Put the login app, username and originating host/IP to lastlog
func Put_lastlog_entry(app, usr, ptsname, host string) {
u, e := user.Lookup(usr)
if e != nil {
return
}
var uid uint32
fmt.Sscanf(u.Uid, "%d", &uid)
t := time.Now().Unix()
_ = C.putlastlogentry(C.int64_t(t), C.int(uid), C.CString(app), C.CString(host))
//stat := C.putlastlogentry(C.int64_t(t), C.int(uid), C.CString(app), C.CString(host))
//fmt.Println("stat was:",stat)
}