What is netdevice?
The net device structure, defined in file linux/include/netdevice. h, is the data structure that defines an instance of a network interface. It tracks the state information of all the network interface devices attached to the TCP/IP stack.
How to Get IP address of interface Linux in C?
Linked
- Equivalent inet_addr for interface name (eth0, etc.) C/C++, Linux.
- Get IP address of interface in Linux using pcap.
- sending IP address of machine to server.
- UDP chat application in C – IP prints as 0.0.0.0.
How do I use ioctl?
Steps involved in IOCTL
- Create IOCTL command in driver.
- Write IOCTL function in the driver.
- Create IOCTL command in a Userspace application.
- Use the IOCTL system call in a Userspace.
Where is ioctl defined?
An ioctl() request has encoded in it whether the argument is an in parameter or out parameter, and the size of the argument argp in bytes. Macros and defines used in specifying an ioctl() request are located in the file .
What is Ipproto_ip?
IPPROTO_IP creates a socket that sends/receives raw data for IPv4-based protocols (TCP, UDP, etc). It will handle the IP headers for you, but you are responsible for processing/creating additional protocol data inside the IP payload.
What is IP address in C program?
C Program to display hostname and IP address
| Function | Description |
|---|---|
| gethostbyname() | It finds the host information corresponding to a host name from host database |
| iten_ntoa() | It converts an IPv4 Internet network address into an ASCII string into dotted decimal format. |
What is ioctl function?
The ioctl() function manipulates the underlying device parameters of special files. In particular, many operating characteristics of character special files (e.g. terminals) may be controlled with ioctl() requests. The argument d must be an open file descriptor. The second argument is a device-dependent request code.
What is Sa_family_t?
sa_family_t sa_family Address family. char sa_data[] Socket address (variable-length data). The sockaddr structure is used to define a socket address which is used in the bind(), connect(), getpeername(), getsockname(), recvfrom(), and sendto() functions.
What is In_port_t?
in_port_t. An unsigned integral type of exactly 16 bits. in_addr_t. An unsigned integral type of exactly 32 bits. The header defines the in_addr structure that includes at least the following member: in_addr_t s_addr.
What is Ip_tos?
IP_TOS (since Linux 1.0) Set or receive the Type-Of-Service (TOS) field that is sent with every IP packet originating from this socket. It is used to prioritize packets on the network. TOS is a byte.
What is ioctl in Linux?
The ioctl () function performs control functions (requests) on a descriptor. (Input) The descriptor on which the control request is to be performed. (Input) The request that is to be performed on the descriptor. (Input) A variable number of optional parameters that are dependent on the request.
What is siocsifname and siocgifconf?
SIOCSIFNAME Changes the name of the interface specified in ifr_name to ifr_newname. This is a privileged operation. It is allowed only when the interface is not up. SIOCGIFCONF Return a list of interface (network layer) addresses. This currently means only addresses of the AF_INET (IPv4) family for compatibility.
How to pass data from one ioctl socket to another?
Create an ifreq structure for passing data in and out of ioctl. Provide an open socket descriptor with the address family AF_INET. Invoke ioctl. Extract the IP address from the ifreq structure. The following header files are needed when using this method: In addition, this particular implementation makes use of:
What is an ioctl () request?
An ioctl () request has encoded in it whether the argument is an in parameter or out parameter, and the size of the argument argp in bytes. Macros and defines used in specifying an ioctl () request are located in the file . See NOTES.