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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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BINDRESVPORT(3) 					   BSD Library Functions Manual 					   BINDRESVPORT(3)

NAME
bindresvport, bindresvport_sa -- bind a socket to a privileged IP port LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <rpc/rpc.h> int bindresvport(int sd, struct sockaddr_in *sin); int bindresvport_sa(int sd, struct sockaddr *sa); DESCRIPTION
The bindresvport() and bindresvport_sa() functions are used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023. If sin is a pointer to a struct sockaddr_in then the appropriate fields in the structure should be defined. Note that sin->sin_family must be initialized to the address family of the socket, passed by sd. If sin->sin_port is '0' then an anonymous port (in the range 600-1023) will be chosen, and if bind(2) is successful, the sin->sin_port will be updated to contain the allocated port. If sin is the NULL pointer, an anonymous port will be allocated (as above). However, there is no way for bindresvport() to return the allo- cated port in this case. Only root can bind to a privileged port; this call will fail for any other users. Function prototype of bindresvport() is biased to AF_INET socket. The bindresvport_sa() function acts exactly the same, with more neutral function prototype. Note that both functions behave exactly the same, and both support AF_INET6 sockets as well as AF_INET sockets. RETURN VALUES
The bindresvport() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
[EPFNOSUPPORT] If second argument was supplied, and address family did not match between arguments. The bindresvport() function may also fail and set errno for any of the errors specified for the calls bind(2), getsockopt(2), or setsockopt(2). SEE ALSO
bind(2), getsockopt(2), setsockopt(2), ip(4) BSD
November 22, 1987 BSD
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