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reversel.c
52 lines (49 loc) · 922 Bytes
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reversel.c
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#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void reverseIP(char*, char*);
int main(int argc, char** argv)
{
char reverse[256];
int ip_len = (int) strlen(argv[1]);
reverseIP(argv[1], reverse);
//printf("%s\n", reverse);
return 0;
}
void reverseIP(char *addr, char *tar )
{
int i,j,count_dots=0,pos=0;
char buffer[10];
for(i=strlen(addr)-1;i>=0;i--)
{
if(addr[i]=='.')
{
for(j=count_dots-1;j>=0;j--)
{
*(tar+pos)=buffer[j];
pos++;
}
*(tar+pos)='.';
pos++;
count_dots=0;
}
else
{
buffer[count_dots]=addr[i];
count_dots++;
}
}
for(j=count_dots-1;j>=0;j--)
{
printf("%c\n",buffer[j]);
*(tar+pos)=buffer[j];
pos++;
}
char *arpa = ".in-addr.arpa";
for(i=0;i<14;i++)
{
*(tar+pos) = *arpa;
pos++;
arpa++;
}
}