Table of Contents
What is the difference between Sockaddr_in and Sockaddr?
And each have themself underling address data structure, for example, for IPv4 it is sockaddr_in , and IPV6 sockaddr_in6 , and sockaddr_un for AF_UNIX socket. sockaddr are used as the common data strut in the signature of those APIs.
Where is Sockaddr defined?
The sockaddr structure is used to define a socket address which is used in the bind(), connect(), getpeername(), getsockname(), recvfrom(), and sendto() functions. The h> header shall define the sockaddr_storage structure.
How do I print a struct sockaddr IP address?
Show activity on this post. struct addrinfo *res; // populated elsewhere in your code struct sockaddr_in *ipv4 = (struct sockaddr_in *)res->ai_addr; char ipAddress[INET_ADDRSTRLEN]; inet_ntop(AF_INET, &(ipv4->sin_addr), ipAddress, INET_ADDRSTRLEN); printf(“The IP address is: %s\n”, ipAddress);
What is the data size of the sockaddr structure?
With IPv4 (what basically everyone in 2005 still uses), the struct s_addr is a 4-byte number that represents one digit in an IP address per byte.
What is a In_addr structure?
Remarks. The in_addr structure is used with IPv4 addresses. The in_addr structure is the IPv4 equivalent of the IPv6-based in6_addr structure. Note The IN_ADDR, PIN_ADDR, and LPIN_ADDR derived structures are only defined on the Windows SDK released with Windows Vista and later.
What is Inaddr_any in socket programming?
This is an IP address that is used when we don’t want to bind a socket to any specific IP. Basically, while implementing communication, we need to bind our socket to an IP address. When we don’t know the IP address of our machine, we can use the special IP address INADDR_ANY .
What is Af_packet in Linux?
The AF_PACKET socket in Linux allows an application to receive and send raw packets. This Linux-specific PMD binds to an AF_PACKET socket and allows a DPDK application to send and receive raw packets through the Kernel.
What is struct sockaddr?
sockaddr. The first structure is sockaddr that holds the socket information − struct sockaddr { unsigned short sa_family; char sa_data[14]; }; This is a generic socket address structure, which will be passed in most of the socket function calls.
Which of the following is commonly used to read an IP address from a sockaddr structure?
ntohl. network to host long : convert a 32-bit number from a network representation into the local processor’s format. This is commonly used to read an IP address from a sockaddr structure.
What is Sockaddr structure?
Why is In_addr a struct?
The reason struct in_addr exists is because it may be more than just one integer.
What type is Inaddr_any?
This is an IP address that is used when we don’t want to bind a socket to any specific IP.
What is packet MMAP?
PACKET_MMAP provides a size configurable circular buffer mapped in user space that can be used to either send or receive packets. This way reading packets just needs to wait for them, most of the time there is no need to issue a single system call.
Where is Af_inet defined?
AF_INET is an address family that is used to designate the type of addresses that your socket can communicate with (in this case, Internet Protocol v4 addresses). When you create a socket, you have to specify its address family, and then you can only use addresses of that type with the socket.
What is the job of the Connect int Sockfd const struct sockaddr * addr Socklen_t Addrlen function?
int bind(int sockfd, const struct sockaddr *my_addr, socklen_t addrlen); The function bind assigns an address to a socket. This is necessary on the server side so that a port number for the socket is known.
What is socket address in Linux?
The socket data structure defines the socket. During a socket subroutine, the system dynamically creates the socket data structure. The socket address is specified by a data structure that is defined in a header file. See the sockaddr Structure figure (Figure 1) for an illustration of this data structure.
Is the sockaddr_storage structure supported on Windows Server 2003?
The SOCKADDR_STORAGE structure is supported on Windows Server 2003 and later. The sockaddr structure and sockaddr_in structures below are used with IPv4. Other protocols use similar structures.
Why use the sockaddr_storage structure?
The use of the SOCKADDR_STORAGE structure promotes protocol-family and protocol-version independence, and simplifies development. It is recommended that the SOCKADDR_STORAGE structure be used in place of the sockaddr structure.
Which header file is automatically included by the winsock2?
The Ws2def.h header file is automatically included by the Winsock2.h header file. The sockaddr_in6 structure is defined in the Ws2ipdef.h header file, not the Ws2tcpip.h header file. The Ws2ipdef.h header file is automatically included by the Ws2tcpip.h header file.