怎么通过socket 夽接字获取client_addr
如何通过socket 夽接字获取client_addr
int s_c = accept(server_socket, (struct sockaddr *) &client_addr, &length1);
client_addr可以获取客户端IP。
因为我只保存了s_c而没有保存client_addr。而保存client_addr也需要额外编程。我现在想通过s_c获取client_addr，或者IP,请问有什么方法。getsockopt行不行？？？有没有什么参数？？
------解决思路----------------------
NAME
getpeername -- get name of connected peer
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
int
getpeername(int s, struct sockaddr * restrict name,
socklen_t * restrict namelen);
DESCRIPTION
The getpeername() system call returns the name of the peer connected to
socket s. The namelen argument should be initialized to indicate the
amount of space pointed to by name. On return it contains the actual
size of the name returned (in bytes). The name is truncated if the
buffer provided is too small.
RETURN VALUES
The getpeername() 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
The call succeeds unless:
[EBADF] The argument s is not a valid descriptor.
[ECONNRESET] The connection has been reset by the peer.
[ENOTSOCK] The argument s is a file, not a socket.
[ENOTCONN] The socket is not connected.
[ENOBUFS] Insufficient resources were available in the system to
perform the operation.
[EFAULT] The name argument points to memory not in a valid part
of the process address space.
SEE ALSO
accept(2), bind(2), getsockname(2), socket(2)
int s_c = accept(server_socket, (struct sockaddr *) &client_addr, &length1);
client_addr可以获取客户端IP。
因为我只保存了s_c而没有保存client_addr。而保存client_addr也需要额外编程。我现在想通过s_c获取client_addr，或者IP,请问有什么方法。getsockopt行不行？？？有没有什么参数？？
------解决思路----------------------
NAME
getpeername -- get name of connected peer
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
int
getpeername(int s, struct sockaddr * restrict name,
socklen_t * restrict namelen);
DESCRIPTION
The getpeername() system call returns the name of the peer connected to
socket s. The namelen argument should be initialized to indicate the
amount of space pointed to by name. On return it contains the actual
size of the name returned (in bytes). The name is truncated if the
buffer provided is too small.
RETURN VALUES
The getpeername() 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
The call succeeds unless:
[EBADF] The argument s is not a valid descriptor.
[ECONNRESET] The connection has been reset by the peer.
[ENOTSOCK] The argument s is a file, not a socket.
[ENOTCONN] The socket is not connected.
[ENOBUFS] Insufficient resources were available in the system to
perform the operation.
[EFAULT] The name argument points to memory not in a valid part
of the process address space.
SEE ALSO
accept(2), bind(2), getsockname(2), socket(2)