
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


char *str_trim(char *s) {
    char *start, *last, *bk;
    int len;

    start = s;
    while (isspace(*start))
        start++;

    bk = last = s + strlen(s) - 1;
    while (last > start && isspace(*last))
        last--;

    if ((s != start) || (bk != last)) {
        len = last - start + 1;
        strncpy(s, start, len);
        s[len] = '\0';
    }   
    return s;
}

int exec_with_result_line(char *cmd, char *result, int len)
{
    FILE *fp = NULL;
	if (!cmd || !result || !len)
		return -1;
    fp = popen(cmd, "r");
    if (!fp) 
        return -1;
    fgets(result, len, fp);   
    str_trim(result);
    pclose(fp);
	return 0;
}


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>

int check_same_network(char *ip1, char *netmask, char *ip2) {
    struct in_addr addr1, addr2, mask;

    if (inet_pton(AF_INET, ip1, &addr1) != 1) {
        printf("Invalid IP address: %s\n", ip1);
        return -1;
    }
    if (inet_pton(AF_INET, netmask, &mask) != 1) {
        printf("Invalid netmask: %s\n", netmask);
        return -1;
    }
    if (inet_pton(AF_INET, ip2, &addr2) != 1) {
        printf("Invalid IP address: %s\n", ip2);
        return -1;
    }

    if ((addr1.s_addr & mask.s_addr) == (addr2.s_addr & mask.s_addr)) {
        return 1;
    } else {
        return 0;
    }
}
