c - INADDR_ANY 接口(interface)是否包括 VMware Network Adapter？

Question

我的代码当前正在使用 INADDR_ANY，我正在测试是否能够通过 Ubuntu 路由器[使用 IPTables] 将数据包从 VM 客户端发送到我的主机。

我能够从 Linux 路由器后面的客户端和主机上的客户端 ping 通主机，但是当我发送 UDP 数据包时，它永远不会到达主机。

问题要么出在这两个地方之一，我为路由设置的 IPTable 无法正常工作，要么出在我绑定(bind)到 INADDR_ANY 的服务器代码中，INADDR_ANY 不包括 VMware 接口(interface)。

我查了一下，但没有找到具体信息。据我了解，没有理由它不起作用。

扩展问题:

根据this如果我运行这些命令，我​​将能够复制相应的 NAT，但是是否显示公共(public) ip 位于此处和私有(private) ip 位于此处是指目的IP还是公私接口(interface)IP？即 eth0 和 eth1 的 IP 地址？

已解决

我在错误的 eth 卡上设置了 iptable 规则!因此，请确保您在正确的 eth 上应用命令。

Answer 1

以下代码是 UDP 连接的客户端。

这适用于 ubuntu linux、VM、Windows XP。

注意:左边距的代码语句(通常)用于调试

注意:系统函数“sendto()”和“recvfrom()”是 UDP 通信的正确调用。

注意:函数大小写等取决于本地使用的编码风格。

注意:与任何“现实生活”项目一样，大部分代码都是为了处理错误。

您可能对 create_UDP_socket() 函数最感兴趣。

/* *************** Included files************************************* */
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>    // for system() and itoa() utilities
#include <stdarg.h>    // for va_list(), etc
#include <string.h>    // string handling utilities
#include <semaphore.h> // semaphores handling utilities

#include <fcntl.h>     // symbolic definitions for flags bits
#include <sys/types.h> // contains definitions of data types used in system calls
#include <sys/socket.h>// type definitions (I.E. struct sockaddr_in)
#include <sys/stat.h>  // symbolic definitions for permission bits and open()
#include <sys/ipc.h>   // ipc interface utilities

#include <sys/shm.h>   // shared memory utilities
#include <arpa/inet.h> // defines INADDR_ANY, etc

#include <errno.h>     // for accessing errno and related functions
#include <stdbool.h>   // define true, false, bool
#include <time.h>

    // contains common data type definitions
#include "localTypes.h"

    // contains data definitions for ON and OFF, enum enumReturnStatus
#include "Defines.h"

    // contains prototypes for writing to Log file
#include "CommonWriteLog.h"

    // contains prototypes, and data type definitions
#include "CommonConfiguration.h"

    //contains prototypes for globally visible functions in this file
#include "Common_UDP_Utilities.h"


/* *************** Global variables *********************************** */



/* *************** File Static Variables ****************************** */



/* *************** Code *********************************************** */



enum enumReturnStatus create_UDP_socket( INT32 taskSelector, INT32 *pUDPsocket_FD )
{
    enum enumReturnStatus returnStatus = eRS_Success; // indicate success
    INT32 LocalPort;
    INT32 socket_FD;
    struct sockaddr_in *pLocal_sockaddr;

char *txtAddress;

    if( is_taskSelector_Valid( taskSelector ) )
    { // then parameters valid

        socket_FD = get_UDPsocket_FD( eTask_Retrieve_GPS );

        if( 0 >= socket_FD )
        { // then socket not yet opened

            pLocal_sockaddr = get_pUDPsocket_sockaddr( taskSelector );

txtAddress = inet_ntoa((*pLocal_sockaddr).sin_addr);
fprintf(stdout, "OPENING SOCKET on socket addresss: %s \n", txtAddress );       

            if( NULL != pLocal_sockaddr )
            { // then, sockaddr configured

                LocalPort = get_UDPsocket_LocalPort( taskSelector );

fprintf(stdout, "OPENING SOCKET on PORT: %d \n", LocalPort );       

                if( 0 <= LocalPort )
                { // then port configured

                    socket_FD = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );

                    if( -1 != socket_FD )
                    { // then, socket creation successful

                        int TurnOn = 1;

                        returnStatus = setsockopt( socket_FD, SOL_SOCKET, SO_REUSEADDR, &TurnOn, sizeof( TurnOn ) );

                        if ( eRS_Success == returnStatus )
                        { // then setsockopt() successful

                            bzero((char *) pLocal_sockaddr, sizeof(struct sockaddr_in) );
                            pLocal_sockaddr->sin_family = AF_INET;
                            pLocal_sockaddr->sin_port = htons( LocalPort );
                            pLocal_sockaddr->sin_addr.s_addr = htonl(INADDR_ANY); // todo: change to specific GPS IP address

                            CommonWriteLog( eLL_Info, 
                                "INFO:File:%s: Line:%d:\n\t%s 0X%08X %d\n\n",
                                __FILE__, __LINE__, 
                                "addr.sin_port =",
                                pLocal_sockaddr->sin_port,
                                pLocal_sockaddr->sin_port );

                            returnStatus = bind( socket_FD, (struct sockaddr *)pLocal_sockaddr, sizeof(struct sockaddr) );

                            if( eRS_Success == returnStatus )
                            { // then bind successful

                                returnStatus = set_UDPsocket_FD( taskSelector, socket_FD );

                                if( eRS_Success != returnStatus )
                                { // then set_UDPsocket_FD failed

                                    CommonWriteLog( eLL_Error, 
                                        get_pFormatString( eFormat_EFFL_string ),
                                        __FILE__, __LINE__, 
                                        "Function:set_UDPsocket_FD() failed" );

                                    returnStatus = eRS_UDP_Create_Failure; // indicate error occurred

                                    close( socket_FD );
                                    socket_FD = -1;
                                }

                                // set callers data
                                *pUDPsocket_FD = socket_FD;
                            }

                            else
                            { // else, bind() failed

                                CommonWriteLog( eLL_Error, 
                                    get_pFormatString( eFormat_EFFL_taskSelector_dataIndex_string_string ),
                                    __FILE__, __LINE__,
                                    taskSelector, 0, 
                                    "LibFunc:bind() failed",
                                    strerror(errno) );
                            } // endif( bind )
                        }

                        else
                        { // else setsockopt() failed

                            CommonWriteLog( eLL_Error, 
                                get_pFormatString( eFormat_EFFL_taskSelector_dataIndex_string_string ),
                                __FILE__, __LINE__, 
                                taskSelector, 0,
                                "LibFunc:setsockopt( SO_REUSEADDR ) failed",
                                strerror(errno) );

                        } // endif( SO_REUSEADDR )
                    }

                    else
                    { // else failed to create socket

fprintf(stdout, "FAILED TO OPEN SOCKET: \n" );       
fflush(stdout);
system("sync;sync;");
exit(EXIT_FAILURE);


                        CommonWriteLog( eLL_Error, 
                            get_pFormatString( eFormat_EFFL_taskSelector_dataIndex_string_string ),
                            __FILE__, __LINE__, 
                            taskSelector, 0,
                            "LibFunc:socket() failed",
                            strerror(errno) );

                        returnStatus = eRS_SystemCall_Failure; // indicate error occured
                    } // endif( socket )
                }

                else
                { // else port not configured

                    CommonWriteLog( eLL_Error, 
                        get_pFormatString( eFormat_EFFL_taskSelector_dataIndex_string ),
                        __FILE__, __LINE__, 
                        taskSelector, 0,
                        "port not configured" );

                    returnStatus = eRS_Configuration_Failure;  // indicate error occurred
                }
            } 

            else
            { // else get pUDP sockaddr failed

                CommonWriteLog( eLL_Error, 
                    get_pFormatString( eFormat_EFFL_taskSelector_dataIndex_string ),
                    __FILE__, __LINE__,
                    taskSelector, 0, 
                    "Function:get_pUDPsocket_sockaddr() failed" );

                returnStatus = eRS_UDP_Create_Failure;  // indicate error occurred
            } // endif( get_pUDPsocket_sockaddr() successful )
        } // endif( socket already open )
    }

    else
    { // else, bad parameters

        returnStatus = eRS_UDP_Create_Failure;

        CommonWriteLog( eLL_Error, 
            get_pFormatString( eFormat_EFFL_digit_string ),
            __FILE__, __LINE__, 
            taskSelector,
            "Parameter:taskSelector out of range" );
    }

    return( returnStatus );
} // end create_UDP_socket()



enum enumReturnStatus write_UDP_socket( INT32 Socket_FD, char *pSocket_OutBuffer, INT32 Size, struct sockaddr *pTo_sockaddr, INT32 *pWriteCount )
{
    enum enumReturnStatus returnStatus = eRS_Success; // indicate success
    INT32 flags = 0;
    INT32 sendtoStatus;



    // do not call CommonWriteLog() to help avoid extranious 'recursion' messages in logs
    // and to avoid recrusive operation

    sendtoStatus = 
    sendto( Socket_FD, pSocket_OutBuffer, Size, flags,pTo_sockaddr, sizeof(struct sockaddr) );

    if( 0 <= sendtoStatus )
    { // then, sendto() successful

        *pWriteCount = sendtoStatus;

        if( sendtoStatus != Size )
        { // then not all char sent
            CommonWriteLog( eLL_Error, 
                "ERROR:File:%s: Line:%d:\n\t%s:num2Send:%d, numSent:%d\n\n",
                __FILE__, __LINE__, 
                "LibFunc:sendto() failed",
                 Size, sendtoStatus );

            returnStatus = eRS_UDP_Write_Failure;  // indicate error occurred
        }
    }

    else
    {
        CommonWriteLog( eLL_Error, 
            get_pFormatString( eFormat_EFFL_string_string ),
            __FILE__, __LINE__, 
            "LibFunc:sendto() failed",
            strerror(errno) );

        returnStatus = eRS_SystemCall_Failure; // indicate error occurred
        *pWriteCount = 0;
    }

    return( returnStatus );
} // end write_UDP_socket()



enum enumReturnStatus read_UDP_socket( INT32 Socket_FD, char *pSocket_InBuffer, INT32 Size, INT32 *pReadCount )
{
    enum enumReturnStatus returnStatus = eRS_Success; 
    INT32   readStatus  = 0; // result of call to recvfrom()
    INT32   flags       = 0; // option parameter for call to recvfrom()
    struct  sockaddr_in from_sockaddr;
    UINT32  slen        = 0; // sizeof struct sockaddr_in



    memset( &from_sockaddr, 0x00, sizeof(from_sockaddr) );
    slen = sizeof( struct sockaddr_in );
    readStatus = recvfrom( Socket_FD, pSocket_InBuffer,Size, flags,(struct sockaddr*)&from_sockaddr, &slen );          // filled during call


    if( 0 > readStatus )
    { // then, an I/O error occurred
        CommonWriteLog( eLL_Error, 
            get_pFormatString( eFormat_EFFL_string_string ),
            __FILE__, __LINE__, 
            "LibFunc:recvfrom() failed",
            strerror(errno) );

        *pReadCount = 0;
        returnStatus = eRS_SystemCall_Failure; // indicate error occurred
    }

    else
    { //else 0 or more bytes read

        // update callers' info
        *pReadCount = readStatus;
    }

    return( returnStatus );
} // end read_UDP_socket()



/* ******************************************************************** **
** End of source file: Common_UDP_Utilities.c
** ******************************************************************** */