privacore-open-source-search-engine/ip.cpp

#include "ip.h"
#include "Log.h"
#include <string.h>
#include <stdio.h>

int32_t atoip ( const char *s , int32_t slen ) {
	// point to it
	const char *p = s;
	// copy into buffer and NULL terminate
	char buf[1024];
	if ( s[slen] ) {
		if ( slen >= 1024 ) slen = 1023;
		memcpy ( buf , s , slen );
		buf [ slen ] = '\0';
		// point to that
		p = buf;
	}
	// convert to int
	struct in_addr in;
	in.s_addr = 0;
	inet_aton ( p , &in );
	// ensure this really is a int32_t before returning ip
	if ( sizeof(in_addr) == 4 ) return in.s_addr;
	// otherwise bitch and return 0
	log("ip:bad inet_aton"); 
	return 0; 
}

int32_t atoip ( const char *s ) {
	// convert to int
	struct in_addr in;
	in.s_addr = 0;
	inet_aton ( s , &in );
	// ensure this really is a int32_t before returning ip
	if ( sizeof(in_addr) == 4 ) return in.s_addr;
	// otherwise bitch and return 0
	log("ip:bad inet_aton"); 
	return 0; 
}

const char *iptoa(int32_t ip, char *buf) {
	sprintf(buf , "%u.%u.%u.%u",
		((ip >>  0)&0xff),
		((ip >>  8)&0xff),
		((ip >> 16)&0xff),
		((ip >> 24)&0xff));
	return buf;
}

// . get domain of ip address
// . first byte is the host (little endian)
int32_t  ipdom ( int32_t ip ) { return ip & 0x00ffffff; };

// most significant 2 bytes of ip
int32_t  iptop ( int32_t ip ) { return ip & 0x0000ffff; };

// returns number of top bytes in comon
int32_t  ipCmp ( int32_t ip1 , int32_t ip2 ) {
	char *a = (char *)&ip1;
	char *b = (char *)&ip2;
	// little endian compare
	if ( a[3] != b[3] ) return 0;
	if ( a[2] != b[2] ) return 1;
	if ( a[1] != b[1] ) return 2;
	if ( a[0] != b[0] ) return 3;
	return 4; // exact match
}