#include
#include
#include
#include
#include
#ifdef Linux
#include
#include
#include
#include
#include
#endif
#ifdef HPUX
#include
#endif
#ifdef AIX
#include
#include
#endif
long mac_addr_sys ( u_char *addr)
{
/* implementation for Linux */
#ifdef Linux
struct ifreq ifr;
struct ifreq *IFR;
struct ifconf ifc;
char buf[1024];
int s, i;
int ok = 0;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s==-1) {
return -1;
}
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
ioctl(s, SIOCGIFCONF, &ifc);
IFR = ifc.ifc_req;
for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; IFR++) {
strcpy(ifr.ifr_name, IFR->ifr_name);
if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0) {
if (! (ifr.ifr_flags & IFF_LOOPBACK)) {
if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0) {
ok = 1;
break;
}
}
}
}
close(s);
if (ok) {
bcopy( ifr.ifr_hwaddr.sa_data, addr, 6);
}
else {
return -1;
}
return 0;
#endif
/* implementation for HP-UX */
#ifdef HPUX
#define LAN_DEV0 "/dev/lan0"
intfd;
struct fisiocnt_block;
inti;
charnet_buf[sizeof(LAN_DEV0)+1];
char*p;
(void)sprintf(net_buf, "%s", LAN_DEV0);
p = net_buf + strlen(net_buf) - 1;
/*
* Get 802.3 address from card by opening the driver and interrogating it.
*/
for (i = 0; i < 10; i++, (*p)++) {
if ((fd = open (net_buf, O_RDONLY)) != -1) {
iocnt_block.reqtype = LOCAL_ADDRESS;
ioctl (fd, NETSTAT, &iocnt_block);
close (fd);
if (iocnt_block.vtype == 6)
break;
}
}
if (fd == -1 || iocnt_block.vtype != 6) {
return -1;
}
bcopy( &iocnt_block.value.s[0], addr, 6);
return 0;
#endif /* HPUX */
/* implementation for AIX */
#ifdef AIX
int size;
struct kinfo_ndd *nddp;
size = getkerninfo(KINFO_NDD, 0, 0, 0);
if (size <= 0) {
return -1;
}
nddp = (struct kinfo_ndd *)malloc(size);
if (!nddp) {
return -1;
}
if (getkerninfo(KINFO_NDD, nddp, &size, 0) < 0) {
free(nddp);
return -1;
}
bcopy(nddp->ndd_addr, addr, 6);
free(nddp);
return 0;
#endif
/* Not implemented platforms */
return -1;
}
/***********************************************************************/
/*
* Main (only for testing)
*/
#ifdef MAIN
int main( int argc, char **argv)
{
long stat;
int i;
u_char addr[6];
stat = mac_addr_sys( addr);
if (0 == stat) {
printf( "MAC address = ");
for (i=0; i<6; ++i) {
printf("%2.2x", addr[i]);
}
printf( "\n");
}
else {
fprintf( stderr, "can't get MAC address\n");
exit( 1);
}
return 0;
}
#endif
E.g you want to use on Linux, save it as file.c simply compile like this:
gcc -O2 -DMAIN -DLinux file.c -o file
And run it
./file
MAC address = 0008c7e9e386
Compare with /sbin/ifconfig result:
/sbin/ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:08:C7:E9:E3:86
inet addr:***.***.***.*** Bcast:***.***.***.*** Mask:255.255.255.0
inet6 addr: ********************* Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:265555947 errors:0 dropped:0 overruns:0 frame:0
TX packets:50507373 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4090310752 (3.8 GiB) TX bytes:1085018636 (1.0 GiB)
It’s the same 
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When I run ssh command I get an error which read as follows:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for ras.mydomain.com has changed and you have requested strict checking.
Host key verification failed.
How do I get rid of this message?
If you have reinstalled Linux or UNIX with OpenSSH, you will get the above error. To get rid of this problem:
Use the -R option to removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts. If your remote hostname is server.example.com, enter:$ ssh-keygen -R {server.name.com}
$ ssh-keygen -R {ssh.server.ip.address}
$ ssh-keygen -R server.example.com
Sample output:
/home/vivek/.ssh/known_hosts updated.
Original contents retained as /home/vivek/.ssh/known_hosts.old
Now, you can connect to the host without a problem.
It is not necessary to delete the entire known_hosts file, just the offending line in that file. For example if you have 3 server as follows.myserver1.com,64.2.5.111 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA11FV0EnGahT2EK8qElocjuHTsu1jaCfxkyIgBTlxlrOIRchb2pw8IzJLOs2bcuYYfa8nSXGEcWyaFD1ifUjfHelj94AAAAB3NzaC1yc2EAAAABIwAAAIEA11FV0E
nGahT2EK8qElocjuHTsu1jaCfxkyIgBTlxlrOIRchb2pw8IzJLOs2bcuYYfa8nSXGEcWyaFD1ifUjfHelj94H+uv304/ZDz6xZb9ZWsdm+264qReImZzruAKxnwTo4dcHkgKXKHeefnBKyEvvp/2ExMV9WT5DVe1viVwk=
myserver2.com,125.1.12.5 ssh-rsa
AAAAB3NzaC1yc2EAAAABIwAAAQEAtDiERucsZzJGx/1kUNIOYhJbczbZHN2Z1gCnTjvO/0mO2R6KiQUP4hOdLppIUc9GNvlp1kGc3w7B9tREH6kghXFiBjrIn6VzUO4uwrnsMbnAnscD5EktgI7fG4ZcNUP 5+J7sa3o+rtmOuiFxCA690DXUJ8nX8yDHaJfzMUTKTGxQz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/IyI4NxHhhpltYZKW/Qz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/M7L0vKeTObue1SgAsXADtK3162a/Z6MGnAazIviHBldxtGrFwvEnk82+GznkO3IBZt5vOK2heBnqQBfw=
myserver3.com,125.2.1.15 ssh-rsa
5+J7sa3o+rtmOuiFxCA690DXUJ8nX8yDHaJfzMUTKTGx0lVkphVsvYD5hJzm0eKHv+oUXRT9v+QMIL+um/IyI4NxHhhpltYZKW
as3533dka//sd33433////44632Z6MGnAazIviHBldxtGrFwvEnk82/Qz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/M7L0vKeTObue1SgAsXADtK3162a/Z6MGnAazIviHBldxtGrFwvEnk82+GznkO3IBZt5vOK2heBnqQBfw==
To delete 2nd server (myserver.com), open file:# vi +2 .ssh/known_hosts
And hit dd command to delete line. Save and close the file. Or use following$ vi ~/.ssh/known_hosts
Now go to line # 2, type the following command:2
Now delete line with dd and exit:dd
:wq
$ cd
$ rm .ssh/known_hosts
$ ssh ras.mydomain.com
Now you should be able to connect your server via ssh.
$ tar zxf g2ipmsg-0.9.5.tar.gz
$ cd g2ipmsg-0.9.5/
$ sudo apt-get install libxml-parser-perl libgnomeui-dev libpanel-applet2-dev gettext intltool
$ ./configure
$ make
$ sudo make install
$ sudo g2ipmsg
- ubuntu 8.04
- gcc 4.2.3
- arm_v5t_le-gcc 3.4.3
Source:Install Zlib:
- [http://www.zlib.net/ Zlib]
- [http://www.ucc.asn.au/~matt/dropbear/dropbear.html Dropbear]
Install Dropbear:
--with-zlib=/home/border/work/SMG/build-tools/zlib/ CC=arm_v5t_le-gcc --host=arm
.
|-- bin
| |-- dbclient
| |-- dropbearconvert
| |-- dropbearkey
| `-- scp
`-- sbin
`-- dropbear
- cd /etc
- mkdir dropbear
- cd dropbear
- dropbearkey -t rsa -f dropbear_rsa_host_key
- dropbearkey -t dss -f dropbear_dss_host_key
Often /etc/localtime is a symlink to the file localtime or to the correct time zone file in the system time zone directory.
Change directory to /etc# cd /etc
Create a symlink to file localtime:# ln -sf /usr/share/zoneinfo/EST localtime
OR some distro use /usr/share/zoneinfo/dirname/zonefile format (Red hat and friends)# ln -sf /usr/share/zoneinfo/EST localtime
OR if you want to set up it to IST (Asia/Calcutta):# ln -sf /usr/share/zoneinfo/Asia/Calcutta localtime
Please mote that in above example you need to use directory structure i.e. if you want to set the timezone to Calcutta (India) which is located in the Asia directory you will then have to setup using as above.
Use date command to verify that your timezone is changed:$ date
Output:
Tue Aug 27 14:46:08 EST 2006
You can use TZ environment variable to display date and time according to your timezone:$ export TZ=America/Los_Angeles
$ date
Sample Output:
Thu Aug 27 11:10:08 PST 2006
Use the following syntax to set new data and time:
date set="STRING"
For example, set new data to 2 Oct 2006 18:00:00, type the following command as root user:# date -s "2 OCT 2006 18:00:00"
OR# date set="2 OCT 2006 18:00:00"
You can also simplify format using following syntax:# date +%Y%m%d -s "20081128"
# date +%T -s "10:13:13"
date -s "042616132010"