在Linux下用c++ping最好的方法是什么?

b5lpy0ml  于 2022-10-04  发布在  Linux
关注(0)|答案(6)|浏览(92)

我必须从C++代码调用ping。我希望轻松地读取输出,以便进一步利用。

我提出了两个解决方案:

  • 使用fork和管道,将ping输出重定向到管道,然后解析它
  • 找到适合直接使用ping(IP_Addresss)函数的库

我喜欢后者,但我没有找到任何明显是标准解决方案的解决方案。

你会怎么做?

iyfjxgzm

iyfjxgzm1#

从教育的Angular 来看,调用外部二进制文件是非常不可取的。尤其是对于发送ICMP回应请求这样的简单任务,您应该学习一些套接字。

aor9mmx1

aor9mmx12#


# include <fcntl.h>

# include <errno.h>

# include <sys/socket.h>

# include <resolv.h>

# include <netdb.h>

# include <netinet/in.h>

# include <netinet/ip_icmp.h>

# define PACKETSIZE  64

struct packet
{
    struct icmphdr hdr;
    char msg[PACKETSIZE-sizeof(struct icmphdr)];
};

int pid=-1;
struct protoent *proto=NULL;
int cnt=1;

/*--------------------------------------------------------------------*/
/*--- checksum - standard 1s complement checksum                   ---*/
/*--------------------------------------------------------------------*/
unsigned short checksum(void *b, int len)
{
    unsigned short *buf = b;
    unsigned int sum=0;
    unsigned short result;

    for ( sum = 0; len > 1; len -= 2 )
        sum += *buf++;
    if ( len == 1 )
        sum += *(unsigned char*)buf;
    sum = (sum >> 16) + (sum & 0xFFFF);
    sum += (sum >> 16);
    result = ~sum;
    return result;
}

/*--------------------------------------------------------------------*/
/*--- ping - Create message and send it.                           ---*/
/*    return 0 is ping Ok, return 1 is ping not OK.                ---*/
/*--------------------------------------------------------------------*/
int ping(char *adress)
{
    const int val=255;
    int i, sd;
    struct packet pckt;
    struct sockaddr_in r_addr;
    int loop;
    struct hostent *hname;
    struct sockaddr_in addr_ping,*addr;

    pid = getpid();
    proto = getprotobyname("ICMP");
    hname = gethostbyname(adress);
    bzero(&addr_ping, sizeof(addr_ping));
    addr_ping.sin_family = hname->h_addrtype;
    addr_ping.sin_port = 0;
    addr_ping.sin_addr.s_addr = *(long*)hname->h_addr;

    addr = &addr_ping;

    sd = socket(PF_INET, SOCK_RAW, proto->p_proto);
    if ( sd < 0 )
    {
        perror("socket");
        return 1;
    }
    if ( setsockopt(sd, SOL_IP, IP_TTL, &val, sizeof(val)) != 0)
    {
        perror("Set TTL option");
        return 1;
    }
    if ( fcntl(sd, F_SETFL, O_NONBLOCK) != 0 )
    {
        perror("Request nonblocking I/O");
        return 1;
    }

    for (loop=0;loop < 10; loop++)
    {

        int len=sizeof(r_addr);

        if ( recvfrom(sd, &pckt, sizeof(pckt), 0, (struct sockaddr*)&r_addr, &len) > 0 )
        {
            return 0;
        }

        bzero(&pckt, sizeof(pckt));
        pckt.hdr.type = ICMP_ECHO;
        pckt.hdr.un.echo.id = pid;
        for ( i = 0; i < sizeof(pckt.msg)-1; i++ )
            pckt.msg[i] = i+'0';
        pckt.msg[i] = 0;
        pckt.hdr.un.echo.sequence = cnt++;
        pckt.hdr.checksum = checksum(&pckt, sizeof(pckt));
        if ( sendto(sd, &pckt, sizeof(pckt), 0, (struct sockaddr*)addr, sizeof(*addr)) <= 0 )
            perror("sendto");

        usleep(300000);

    }

    return 1;
}

/*--------------------------------------------------------------------*/
/*--- main - look up host and start ping processes.                ---*/
/*--------------------------------------------------------------------*/
int main(int argc, char *argv[])
{

    if (ping("www.google.com"))
        printf("Ping is not OK. n");
    else
        printf("Ping is OK. n");

    return 0;
}
bqf10yzr

bqf10yzr3#

我会选择你的第一个选择。Linux是围绕这样一个概念构建的,即拥有专门的小型应用程序,这些应用程序可以很好地完成一件事,即与管道进行通信。你的应用程序不应该包括一个库来实现ping,因为已经有一个内置的命令来实现它,而且它工作得很好!

91zkwejq

91zkwejq4#

Check out BusyBox's source for 'ping' - you can use the ping4 and ping6 functions. Just be mindful of the GPL.

Spawning 'ping' should work too - check out popen(2) for a simpler API that also runs a shell. If it's a problem, pipe + fork + exec should work.

ds97pgxw

ds97pgxw5#

https://github.com/octo/liboping怎么样?


# include <oping.h>

    int main(){

        // run ping 100times
        for (uint32_t i=0; i< 100; i++){
            pingobj_t * pingObj = ping_construct();
            ping_host_add(pingObj, "www.gmx.de");

            auto startTime = std::chrono::high_resolution_clock::now();
            auto ret = ping_send(pingObj);
            auto endTime = std::chrono::high_resolution_clock::now();
            if (ret > 0){
                auto duration = (double)std::chrono::duration_cast<std::chrono::microseconds>(endTime - startTime).count()/1000.0;
                std::cout << "success -- ping in " << duration << "ms" << std::endl;
            } else {
                std::cout << "failed" << std::endl;
            }
            ping_destroy(pingObj);

            // wait 1sec
            std::this_thread::sleep_for(std::chrono::milliseconds (1000));
        }

    }

liboping应该出现在大多数Linux系统中

  • 安装libping-dev(例如:sudo apt install liboping-dev)
  • 链接到libping
k10s72fa

k10s72fa6#

我成功地做到了这一点:

我使用Popen,它基本上创建了一个管道、叉子和exec,然后,如果我需要的话,我可以用plose等待。

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