Why I can't bind the 1023 port?
laodx at gzjpg.com
Tue Jun 11 12:18:34 EST 2002
I recently met some trouble with the "rcp" command. My "rcp" could not work
even if I have correctly configure the remote host.
When I run rcp in my local host, it print "Permission deny" to the terminal.
So I re-compiled rcp and debugged it by GDB. I found that it fail while tried to
bind the 1023 port for connecting with the remote rshd.
I though the 1023 port might be protected, and I wrote a program as below:
--- begin ---
extern int errno;
int main (int argc, char **argv)
int s, rv;
unsigned short port = 1023;
struct sockaddr_in sin;
s = socket (AF_INET, SOCK_STREAM, 0);
if (s < 0)
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons (port);
rv = bind (s, (struct sockaddr *) &sin, sizeof (sin));
if (rv < 0)
--- end ---
The running result was that I could not bind these ports: 1023, 1022, ...
but it was success in bind 1024 port.
And while I su to as the super-user, I could bind all these ports!
I am wondering if the ports were really protected, and how can I use the ports?
Should anyone be kind to give me some advise?
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