什么是网站主题优化,做网站的又营业执照的吗,西部网站建设,简单网站页面设计在Linux系统上用C将主机名称转换为IPv4、IPv6地址
功能
指定一个std::string类型的主机名称#xff0c;函数解析主机名称为IP地址#xff0c;含IPv4和IPv6#xff0c;解析结果以std::vectorstd::string类型返回。解析出错或者解析失败抛出std::string类型的异常消…在Linux系统上用C将主机名称转换为IPv4、IPv6地址
功能
指定一个std::string类型的主机名称函数解析主机名称为IP地址含IPv4和IPv6解析结果以std::vectorstd::string类型返回。解析出错或者解析失败抛出std::string类型的异常消息。
源代码
以前随便写的一个解析域名为IP地址的功能现在需要支持IPv6所以做了些调整。最后结果如下
/*C将域名解析为IP地址含IPv4和IPv6
编译 g -o main main.cpp
执行./main
效果$ ./main
13.226.120.15
13.226.120.23
13.226.120.56
13.226.120.3
2600:9000:21e1:1200:1c:b3b0:7700:93a1
2600:9000:21e1:bc00:1c:b3b0:7700:93a1
2600:9000:21e1:9a00:1c:b3b0:7700:93a1
2600:9000:21e1:4e00:1c:b3b0:7700:93a1
2600:9000:21e1:a200:1c:b3b0:7700:93a1
2600:9000:21e1:3600:1c:b3b0:7700:93a1
2600:9000:21e1:1a00:1c:b3b0:7700:93a1
2600:9000:21e1:1800:1c:b3b0:7700:93a1*/// getaddrinfo, gai_strerror, freeaddrinfo
#include sys/types.h
#include sys/socket.h
#include netdb.h// inet_ntop
#include arpa/inet.h// strerror
#include cstring#include string
#include vector
#include iostream// 域名解析为IP地址返回地址列表。
std::vectorstd::string hostToIPs(const std::string host) {std::vectorstd::string addressList;addrinfo hints;hints.ai_family AF_UNSPEC;hints.ai_socktype SOCK_STREAM;hints.ai_protocol 0;hints.ai_flags 0;hints.ai_canonname nullptr;hints.ai_addr nullptr;hints.ai_next nullptr;addrinfo* result nullptr;auto res getaddrinfo(host.c_str(), nullptr, hints, result);if (0 ! res) {throw std::string(gai_strerror(res));}if (nullptr ! result) {int bufferSize 64;char buffer[64];void* pointer;for (auto rp result; rp ! nullptr; rp rp-ai_next) {switch (rp-ai_family) {case AF_INET:pointer (void*)(((sockaddr_in*)(rp-ai_addr))-sin_addr);break;case AF_INET6:pointer (void*)(((sockaddr_in6*)(rp-ai_addr))-sin6_addr);break;default:continue;}if (nullptr inet_ntop(rp-ai_family, pointer, buffer, bufferSize)) {freeaddrinfo(result);throw std::string(Run inet_ntop fail, errno is ) std::to_string(errno) , message: std::string(strerror(errno));}addressList.emplace_back(std::string(buffer));}freeaddrinfo(result);}if (addressList.size() 0) {throw std::string(address list is empty);}return addressList;
}int main() {try {for (const auto address : hostToIPs(www.english.com)) {std::cout address std::endl;}} catch (const std::string e) {std::cout e std::endl;}return 0;
}
运行截图
程序在Ubuntu上开发调试结果是OK的。解析结果支持IPv4和IPv6地址主要参考材料是man手册。运行截图
