一个根据ip和掩码列出ip范围的小程序

要分析几个ip，写了个小程序，类似于ipcalc的功能，不过简单得多。

 

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <stdint.h>

int main(int argc, char **argv)
{
    uint32_t ip_net, mask_net;
    uint32_t ip_host, mask_host;
    uint32_t ip_start, ip_end;
    struct in_addr in_start, in_end;

    if(argc != 3)
    {
        printf("usage:%s ip mask\n", argv[0]);
        exit(1);
    }

    ip_net = inet_addr(argv[1]);
    mask_net = inet_addr(argv[2]);

    ip_host = ntohl(ip_net);
    mask_host = ntohl(mask_net);

    ip_start = ip_host & mask_host;
    ip_end = ip_host | (~mask_host);

    printf("ip_start:%x,", ip_start);
    printf("ip_end:%x\n", ip_end);

    in_start.s_addr = ntohl(ip_start);
    in_end.s_addr = ntohl(ip_end);
    printf("ip start:%s,", inet_ntoa(in_start));
    printf("ip end:%s\n", inet_ntoa(in_end));

    return 0;
}

 

执行效果：

./ip_mask_scope 10.24.55.0 255.255.240.0
ip_start:a183000,ip_end:a183fff
ip start:10.24.48.0,ip end:10.24.63.255
ipcalc 10.24.55.0/255.255.240.0
Address:   10.24.55.0           00001010.00011000.0011 0111.00000000
Netmask:   255.255.240.0 = 20   11111111.11111111.1111 0000.00000000
Wildcard:  0.0.15.255           00000000.00000000.0000 1111.11111111
=>
Network:   10.24.48.0/20        00001010.00011000.0011 0000.00000000
HostMin:   10.24.48.1           00001010.00011000.0011 0000.00000001
HostMax:   10.24.63.254         00001010.00011000.0011 1111.11111110
Broadcast: 10.24.63.255         00001010.00011000.0011 1111.11111111
Hosts/Net: 4094                  Class A, Private Internet