Linux下使用inet库
#include <arpa/inet.h>
#include <iostream>
#include <string>
using namespace std;
bool validate_ip_address(const char* ip, const bool& ipv6) {
unsigned char buf[sizeof(struct in6_addr)];
if (ipv6) { //ipv6
if (inet_pton(AF_INET6, ip, buf))
return true;
}
else { //ipv4
if (inet_pton(AF_INET, ip, buf))
return true;
}
return false;
}
bool validate_ip_address(const std::string& ip, bool ipv6) {
return validate_ip_address(ip.data(), ipv6);
}
int main() {
std::string s1("10.10.10.10:20");
std::string s2("10.10.10.10");
std::string s3("10.10.10:20");
std::string s4("10.10.10.10:20.20");
std::string s5("10.a10.10:20");
std::string s6("10.10.10.a10:20");
std::string s7("10");
std::string s8("10.10.10.1001:30");
std::string s9("10.10.10.1001:");
std::string s10("10:1");
std::string s11("10.10.10.10.10:10");
std::string s12("10.10.10.10:a");
std::string s13("10.10.10.10.10.10:101");
std::string s14("300.10.10.10:20");
std::string s15("0:0:0:0:0:FFFF:204.152.189.116");
std::cout << s1 << " " << std::boolalpha << validate_ip_address(s1, false) << std::endl;
std::cout << s2 << " " << std::boolalpha << validate_ip_address(s2, false) << std::endl;
std::cout << s3 << " " << std::boolalpha << validate_ip_address(s3, false) << std::endl;
std::cout << s4 << " " << std::boolalpha << validate_ip_address(s4, false) << std::endl;
std::cout << s5 << " " << std::boolalpha << validate_ip_address(s5, false) << std::endl;
std::cout << s6 << " " << std::boolalpha << validate_ip_address(s6, false) << std::endl;
std::cout << s7 << " " << std::boolalpha << validate_ip_address(s7, false) << std::endl;
std::cout << s8 << " " << std::boolalpha << validate_ip_address(s8, false) << std::endl;
std::cout << s9 << " " << std::boolalpha << validate_ip_address(s9, false) << std::endl;
std::cout << s10 << " " << std::boolalpha << validate_ip_address(s10, false) << std::endl;
std::cout << s11 << " " << std::boolalpha << validate_ip_address(s11, false) << std::endl;
std::cout << s12 << " " << std::boolalpha << validate_ip_address(s12, false) << std::endl;
std::cout << s13 << " " << std::boolalpha << validate_ip_address(s13, true) << std::endl;
std::cout << s14 << " " << std::boolalpha << validate_ip_address(s14, false) << std::endl;
std::cout << s15 << " " << std::boolalpha << validate_ip_address(s15, true) << std::endl;
}
- 高版本GCC支持regex
- GCC 4.8不支持regex，手动实现
#include <iostream>
#include <string>
#include <cctype>
#include <cstdlib>
using namespace std;
bool validate_connection(std::string conn, bool ipv6)
{
const char dot = '.';
const char colon = ':';
const size_t max_dots = ipv6 ? 5 : 3; //three dots in ipv4 and five dots in ipv6
const size_t max_colons = 1; //one colon seperating ip and port
const size_t max_digits = 3; //as most three digits in part of ip
const int max_piece_val = 255; //255 is the max val of a piece of ip
size_t dots = 0;
size_t colons = 0;
size_t port_len = 0;
std::string::iterator iter = conn.begin();
size_t piece_len = 0;
int piece_val = 0;
for (; iter != conn.end(); ++iter) {
if (dots < max_dots) { //former three parts of ip
if (*iter != dot) {
if (!std::isdigit(*iter)) //only digit allowed
return false;
if (piece_len == max_digits) //a part of ip contains no more than three digits
return false;
if ((piece_val = piece_val * 10 + *iter - '0') > max_piece_val)
return false;
++piece_len;
}
else {
++dots;
piece_val = 0;
piece_len = 0;
}
}
else { //the left is {4th part of ip}:port
if (colons < max_colons) { //the forth part of ip
if (*iter != colon) {
if (!std::isdigit(*iter))
return false;
if (piece_len == max_digits)
return false;
if ((piece_val = piece_val * 10 + *iter - '0') > max_piece_val)
return false;
++piece_len;
}
else
{
++colons;
piece_len = 0;
}
}
else { //port
if (!std::isdigit(*iter))
return false;
++port_len;
}
}
}
if (dots < max_dots || colons < max_colons || port_len == 0)
return false;
return true;
}
int main()
{
std::string s1("10.10.10.10:20");
std::string s2("10.10.10.10");
std::string s3("10.10.10:20");
std::string s4("10.10.10.10:20.20");
std::string s5("10.a10.10:20");
std::string s6("10.10.10.a10:20");
std::string s7("10");
std::string s8("10.10.10.1001:30");
std::string s9("10.10.10.1001:");
std::string s10("10:1");
std::string s11("10.10.10.10.10:10");
std::string s12("10.10.10.10:a");
std::string s13("10.10.10.10.10.10:101");
std::string s14("300.10.10.10:20");
std::cout << s1 << " " << std::boolalpha << validate_connection(s1, false) << std::endl;
std::cout << s2 << " " << std::boolalpha << validate_connection(s2, false) << std::endl;
std::cout << s3 << " " << std::boolalpha << validate_connection(s3, false) << std::endl;
std::cout << s4 << " " << std::boolalpha << validate_connection(s4, false) << std::endl;
std::cout << s5 << " " << std::boolalpha << validate_connection(s5, false) << std::endl;
std::cout << s6 << " " << std::boolalpha << validate_connection(s6, false) << std::endl;
std::cout << s7 << " " << std::boolalpha << validate_connection(s7, false) << std::endl;
std::cout << s8 << " " << std::boolalpha << validate_connection(s8, false) << std::endl;
std::cout << s9 << " " << std::boolalpha << validate_connection(s9, false) << std::endl;
std::cout << s10 << " " << std::boolalpha << validate_connection(s10, false) << std::endl;
std::cout << s11 << " " << std::boolalpha << validate_connection(s11, false) << std::endl;
std::cout << s12 << " " << std::boolalpha << validate_connection(s12, false) << std::endl;
std::cout << s13 << " " << std::boolalpha << validate_connection(s13, true) << std::endl;
std::cout << s14 << " " << std::boolalpha << validate_connection(s14, false) << std::endl;
}
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