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Full Discussion: rlogin/rsh incoming port
Top Forums Programming rlogin/rsh incoming port Post 54502 by andryk on Tuesday 17th of August 2004 04:13:10 AM
Old 08-17-2004
rlogin/rsh incoming port

Hi all,

In need to know why my sample code below that connect to a rlogind (513) fails, but original unix rlogin does not ? (.rhosts is verified to be correct)

I heard rlogin/rsh bind to a reserved port before connecting to the rlogin server. what are they ???

Code:
   s = socket(AF_INET, SOCK_STREAM, 0);
   sck.sin_family      = AF_INET;
   sck.sin_port        = htons(513);
   sck.sin_addr.s_addr = inet_addr("192.168.15.40");

   if (connect(s, (struct sockaddr *)&sck,sizeof(sck)) <0) {
      printf("connect() error\n"); return;
   }
   printf("Connected %d\n",s);
   write(s,"",1);
   write(s,"root",5);
   write(s,"root",5);
   write(s,"linux/38400",12);

   read(s,buf,sizeof(buf));
   printf("%s\n",buf);

Any help would be appreciated Smilie
 

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RLOGIN(1)						    BSD General Commands Manual 						 RLOGIN(1)

NAME
rlogin -- remote login SYNOPSIS
rlogin [-468DEd] [-e char] [-i localname] [-l username] host DESCRIPTION
The rlogin utility starts a terminal session on a remote host host. The standard Berkeley rhosts authorization mechanism is used. The following options are available: -4 Use IPv4 addresses only. -6 Use IPv6 addresses only. -8 Allow an eight-bit input data path at all times; otherwise parity bits are stripped except when the remote side's stop and start char- acters are other than ^S/^Q. -D Set the TCP_NODELAY socket option which can improve interactive response at the expense of increased network load. -E Stop any character from being recognized as an escape character. When used with the -8 option, this provides a completely transparent connection. -d Turn on socket debugging (see setsockopt(2)) on the TCP sockets used for communication with the remote host. -e Allow user specification of the escape character, which is ``~'' by default. This specification may be as a literal character, or as an octal value in the form nn. -i Allow the caller to specify a different local name to be used for authentication. This option is restricted to processes with uid 0. -l Specify a different username for the remote login. If this option is not specified, your local username will be used. A line of the form ``<escape char>.'' disconnects from the remote host. Similarly, the line ``<escape char>^Z'' will suspend the rlogin ses- sion, and ``<escape char><delayed-suspend char>'' suspends the send portion of the rlogin session, but allows output from the remote system. By default, the tilde (``~'') character is the escape character, and normally control-Y (``^Y'') is the delayed-suspend character. All echoing takes place at the remote site, so that (except for delays) the rlogin is transparent. Flow control via ^S/^Q and flushing of input and output on interrupts are handled properly. ENVIRONMENT
The following environment variable is utilized by rlogin: TERM Determines the user's terminal type. FILES
/etc/hosts /etc/hosts.equiv $HOME/.rhosts SEE ALSO
login(1), rsh(1), telnet(1), setsockopt(2), ruserok(3), tty(4), hosts(5), hosts.equiv(5), rlogind(8), rshd(8) HISTORY
The rlogin command appeared in 4.2BSD. IPv6 support was added by WIDE/KAME project. BUGS
The rlogin utility will be replaced by telnet(1) in the near future. More of the environment should be propagated. BSD
September 26, 2003 BSD
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