Paste: IP
| Author: | dddd |
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| Mode: | c++ |
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| Date: | Fri, 26 Aug 2022 04:09:54 |
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Plain Text |
string validIPAddress(string IP) {
int dot = 0, colon = 0;
for(int i = 0; i < IP.length(); i++){
if(IP[i] == '.')
dot++;
if(IP[i] == ':')
colon++;
}
if(dot == 3 and colon == 0 and IP.length() <= 15){
for(int i = 0; i < IP.length(); i++){
if(isalpha(IP[i]))
return "Neither";
}
return checkIPv4(IP);
}
else if(colon == 7 and dot == 0){
for(int i = 0; i < IP.length(); i++){
if(IP[i] >= 'G' and IP[i] <= 'Z')
return "Neither";
if(IP[i] >= 'g' and IP[i] <= 'z')
return "Neither";
}
return checkIPv6(IP);
}
else
return "Neither";
}
string checkIPv4(string IP){
int i = 0, j = 0, count = 0;
while(j < IP.length()){
if(IP[j] == '.'){
count++;
string s = IP.substr(i, j - i);
if(s.length() == 0)
return "Neither";
if(s[0] == '0' and s.length()!= 1)
return "Neither";
if(stoi(s) > 255)
return "Neither";
i = j + 1;
j = j + 1;
if(count==3)
break;
}
else
j = j + 1;
}
string s = IP.substr(i, IP.length() - i);
if(s.length() == 0)
return "Neither";
if(s[0] == '0' and s.length()!= 1)
return "Neither";
if(stoi(s) > 255)
return "Neither";
return "IPv4";
}
string checkIPv6(string IP){
int i = 0, j = 0, count = 0;
while(j < IP.length()){
if(IP[j] == ':'){
count++;
string s = IP.substr(i, j - i);
if(s.length() < 1 or s.length() > 4)
return "Neither";
i = j + 1;
j = j + 1;
if(count==7)
break;
}
else
j = j + 1;
}
string s = IP.substr(i, IP.length() - j);
if(s.length() == 0)
return "Neither";
if(s.length() < 1 or s.length() > 4)
return "Neither";
return "IPv6";
}
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