IPv4 and IPv6 functions

Helper functions for various calculations. More...

Modules
	IPv4 functions
	Helper functions for various calculations.
	IPv6 functions
	Helper functions for various calculations.

Files
file	iputil.c
	IPv4 And IPv6 Utiliies.

Enumerations
enum	ipversion { IP_PROTO_V4 = 4, IP_PROTO_V6 = 6 }
	IP Protocol numbers. More...

Functions
int	packetchecksum (uint8_t *pkt)
	Generic IPv4 and IPv6 Checksum. More...
int	inet_lookup (int family, const char *host, void *addr, socklen_t len)
	Perform DNS lookup on a host/ip retun the IP address. More...

Detailed Description

Helper functions for various calculations.

Enumeration Type Documentation

enum ipversion

IP Protocol numbers.

Enumerator
IP_PROTO_V4
IP_PROTO_V6

Definition at line 77 of file iputil.c.

               {
    IP_PROTO_V4 = 4,
    IP_PROTO_V6 = 6
};

Function Documentation

int inet_lookup	(	int	family,
		const char *	host,
		void *	addr,
		socklen_t	len
	)

Perform DNS lookup on a host/ip retun the IP address.

Parameters

family	Protocol family either PF_INET or PF_INET6.
host	Hostname or IP address to lookup.
addr	A structure in_addr or in6_addr the result is returned in.
len	Length of the structure to place the result.

Returns

0 on failure ie addr is unaltered.

Definition at line 523 of file iputil.c.

Referenced by mcast_socket().

                                                                         {
    struct addrinfo hint, *result, *ainfo;
    int ret = 0;

    memset(&hint, 0, sizeof(hint));
    hint.ai_family = family;

    if (getaddrinfo(host, NULL, &hint, &result) || !result) {
        return ret;
    }

    for(ainfo = result; ainfo; ainfo = ainfo->ai_next) {
        switch(ainfo->ai_family) {
            case PF_INET:
                if (len >= sizeof(struct in_addr)) {
                    struct sockaddr_in *sa4 = (struct sockaddr_in*)ainfo->ai_addr;
                    memcpy(addr, &sa4->sin_addr, len);
                    ret = 1;
                }
                break;
            case PF_INET6:
                if (len >= sizeof(struct in6_addr)) {
                    struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)ainfo->ai_addr;
                    memcpy(addr, &sa6->sin6_addr, len);
                    ret = 1;
                }
                break;
        }
        if (ret) {
            break;
        }
    }
    freeaddrinfo(result);
    return ret;
}

int packetchecksum

(

uint8_t *

pkt

)

Generic IPv4 and IPv6 Checksum.

Parameters

pkt	Packet buffer to check.

Returns

Checksum.

Definition at line 208 of file iputil.c.

References IP_PROTO_V4, IP_PROTO_V6, and packetchecksumv4().

                                        {
    struct iphdr *ip = (struct iphdr *)pkt;

    switch(ip->version) {
        case IP_PROTO_V4:
            return (packetchecksumv4(pkt));
            break;
        case IP_PROTO_V6:
            break;
    }
    return (-1);
}