1、由文件描述符打印IP地址及端口。（参考）
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#include <stdio.h>
#include <netdb.h>
#include <sys/socket.h>
#include <arpa/inet.h>
//由文件描述符打印对应IP地址和端口
void
PrintAddrByFd(
int
sockfd)
{
struct
sockaddr_in addr_in;
socklen_t len =
sizeof
(addr_in);
getsockname(sockfd, (
struct
sockaddr *)&addr_in, &len);
if
(addr_in.sin_family != AF_INET) {
printf
(
"Not an Internet socket.\n"
);
return
;
}
printf
(
"addr:%s, port:%d\n"
, inet_ntoa(addr_in.sin_addr), ntohs(addr_in.sin_port));
}
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2、打印本机所有IP地址。
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#include <stdio.h>
#include <ifaddrs.h>
#include <netinet/in.h>
//打印本机所有IP地址
int
main (
int
argc,
const
char
* argv[])
{
struct
ifaddrs * ifAddrStruct = NULL;
void
* tmpAddrPtr = NULL;
getifaddrs(&ifAddrStruct);
while
(ifAddrStruct != NULL)
{
if
(ifAddrStruct->ifa_addr->sa_family == AF_INET)
{
// check it is IP4
// is a valid IP4 Address
tmpAddrPtr = &((
struct
sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
char
addressBuffer[INET_ADDRSTRLEN];
inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
printf
(
"%s IPV4 Address %s\n"
, ifAddrStruct->ifa_name, addressBuffer);
}
else
if
(ifAddrStruct->ifa_addr->sa_family == AF_INET6)
{
// check it is IP6
// is a valid IP6 Address
tmpAddrPtr=&((
struct
sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
char
addressBuffer[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
printf
(
"%s IPV6 Address %s\n"
, ifAddrStruct->ifa_name, addressBuffer);
}
ifAddrStruct = ifAddrStruct->ifa_next;
}
return
0;
}
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参考链接：
*** walker ***
本文转自walker snapshot博客51CTO博客，原文链接http://blog.51cto.com/walkerqt/1741099如需转载请自行联系原作者
RQSLT
