目的可能是为了获取rtmp真正的推流ip
如果rtmp推流地址是域名，往CDN推流的话，需要nslookup 的那种DNS解析，然后获取的几个ip
可以使用netstat -n 等命令查看 1935端口的真正ip是多少，废话不多说，下面是代码：
--------------------
代码中可能只需要关心 EnumTCPTable() 然后判断 if (htons((u_short)pTcpTable->table[i].dwRemotePort) == 1935)
获取该端口的ip
-------------------------------------------------------------------------------------------------------------------------
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <Iphlpapi.h>
#include <malloc.h>
#include <Winsock2.h>
#include <stdlib.h>
#include <tchar.h> #pragma comment(lib, "Iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib") static char TcpState[][] =
{
"???",
"CLOSED",
"LISTENING",
"SYN_SENT",
"SEN_RECEIVED",
"ESTABLISHED",
"FIN_WAIT",
"FIN_WAIT2",
"CLOSE_WAIT",
"CLOSING",
"LAST_ACK",
"TIME_WAIT"
}; DWORD EnumTCPTable()
{
PMIB_TCPTABLE pTcpTable = NULL;
DWORD dwSize = ;
DWORD dwRetVal = ERROR_SUCCESS; struct in_addr rip;
struct in_addr lip;
char szrip[] = {};
char szlip[] = {}; //获得pTcpTable所需要的真实长度,dwSize
if (GetTcpTable(pTcpTable, &dwSize, TRUE) == ERROR_INSUFFICIENT_BUFFER)
{
pTcpTable = (MIB_TCPTABLE*) malloc ((UINT) dwSize);
}
else
return dwRetVal; printf("Active Connections\n\n");
printf(" Proto\t%-24s%-24s%s\n","Local Address","Foreign Address","State"); if ((dwRetVal = GetTcpTable(pTcpTable, &dwSize, TRUE)) == NO_ERROR)
{
for (int i = ; i < (int) pTcpTable->dwNumEntries; i++)
{
rip.S_un.S_addr = pTcpTable->table[i].dwRemoteAddr;
lip.S_un.S_addr = pTcpTable->table[i].dwLocalAddr;
//监听端口，远程主机端口为0，但函数返回是有值的，不知道它是怎么考虑的
if (pTcpTable->table[i].dwState == MIB_TCP_STATE_LISTEN)
pTcpTable->table[i].dwRemotePort = ; //dwLocalPort，dwRemotePort 是网络字节
_snprintf(szlip,sizeof(szlip),"%s:%d",inet_ntoa(lip),htons((u_short)pTcpTable->table[i].dwLocalPort));
_snprintf(szrip,sizeof(szrip),"%s:%d",inet_ntoa(rip),htons((u_short)pTcpTable->table[i].dwRemotePort));
printf(" TCP\t%-24s%-24s%s\n",szlip,szrip,TcpState[pTcpTable->table[i].dwState]);
}
}
else
{
printf("\tCall to GetTcpTable failed.\n"); LPVOID lpMsgBuf; if (FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwRetVal,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
,
NULL ))
{
printf("\tError: %s", lpMsgBuf);
}
LocalFree( lpMsgBuf );
}
GlobalFree(pTcpTable);
return dwRetVal;
} DWORD EnumUDPTable()
{
PMIB_UDPTABLE pUdpTable = NULL;
DWORD dwSize = ;
DWORD dwRetVal = ERROR_SUCCESS; // struct in_addr rip;
struct in_addr lip;
// char szrip[32] = {0};
char szlip[] = {}; //获得pUdpTable所需要的真实长度,dwSize
if (GetUdpTable(pUdpTable, &dwSize, TRUE) == ERROR_INSUFFICIENT_BUFFER)
{
pUdpTable = (MIB_UDPTABLE*) malloc ((UINT) dwSize);
}
else
return dwRetVal; printf("Active Connections\n\n");
printf(" Proto\t%-24s%-24s\n","Local Addr","Local Port"); if ((dwRetVal = GetUdpTable(pUdpTable, &dwSize, TRUE)) == NO_ERROR)
{
for (int i = ; i < (int) pUdpTable->dwNumEntries; i++)
{
// rip.S_un.S_addr = pUdpTable->table[i].dwRemoteAddr;
lip.S_un.S_addr = pUdpTable->table[i].dwLocalAddr;
//监听端口，远程主机端口为0，但函数返回是有值的，不知道它是怎么考虑的
// if (pUdpTable->table[i].dwState == MIB_Udp_STATE_LISTEN)
// pUdpTable->table[i].dwRemotePort = 0; //dwLocalPort，dwRemotePort 是网络字节
_snprintf(szlip,sizeof(szlip),"%s:%d",inet_ntoa(lip),htons((u_short)pUdpTable->table[i].dwLocalPort));
// _snprintf(szrip,sizeof(szrip),"%s:%d",inet_ntoa(rip),htons((u_short)pTcpTable->table[i].dwRemotePort));
// printf(" TCP\t%-24s%-24s%s\n",szlip,szrip,TcpState[pTcpTable->table[i].dwState]);
printf(" UDP\t%-24s\n",szlip);
}
}
else
{
printf("\tCall to GetUdpTable failed.\n"); LPVOID lpMsgBuf; if (FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwRetVal,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
,
NULL ))
{
printf("\tError: %s", lpMsgBuf);
}
LocalFree( lpMsgBuf );
}
GlobalFree(pUdpTable);
return dwRetVal;
} DWORD DelTCPConnect(const char *lpszLocalAddr,
const char * lpszRemoteAddr,
DWORD dwLocalPort,
DWORD dwRemotePort)
{
DWORD dwRetVal = ERROR_NOT_FOUND;
MIB_TCPROW srtTcpRow;
srtTcpRow.dwLocalAddr = inet_addr(lpszLocalAddr);
srtTcpRow.dwRemoteAddr = inet_addr(lpszRemoteAddr);
srtTcpRow.dwLocalPort = htons(dwLocalPort);
srtTcpRow.dwRemotePort = htons(dwRemotePort);
srtTcpRow.dwState = MIB_TCP_STATE_DELETE_TCB; //目前为止，settcpEntry只支持该参数
dwRetVal = SetTcpEntry(&srtTcpRow);
if (dwRetVal != ERROR_SUCCESS)
{
LPVOID lpMsgBuf;
if (FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwRetVal,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
,
NULL ))
{
printf("\tError: %s", lpMsgBuf);
}
LocalFree( lpMsgBuf );
}
return dwRetVal;
} void main()
{
DWORD TcpInfo = EnumTCPTable();
DWORD UdpInfo = EnumUDPTable();
system("pause");
system("pause");
}
http://blog.csdn.net/syytem004/article/details/43272359