Linux下程式設計設定IP，閘道器

1.拼湊成指令實現：

#include #include int main(void)

; char cmd_gw[64] = ;
sprintf(cmd_ip_mask, "ifconfig eth0 %s netmask %s", ip, mask);
sprintf(cmd_gw, "route add default gw %s netmask %s", gateway);
system(cmd_ip_mask);
system(cmd_gw);
return 0;
}

#include #include #include #define file_name "ip.txt"

int main(void)
; char cmd_gw[64] = ;
if( (fp=fopen(file_name,"r"))==null )
fgets(ip, 20, fp);
fgets(mask, 20, fp);
fgets(gateway, 20, fp);
printf("ip : %s ", ip);
printf("mask : %s ", mask);
printf("gateway : %s \n", gateway);
sprintf(cmd_ip_set, "ifconfig eth0 %s", ip);
system(cmd_ip_set);
sprintf(cmd_ip_set, "ifconfig eth0 netmask %s", mask);
system(cmd_ip_set);
sprintf(cmd_ip_set, "route add default gw %s", gateway);
system(cmd_ip_set);
return 0;
}

#include #include #include #include #include #include #include #include #include #include #define false 0

#define true 1
#define file_name "ip.txt"
#if 1
int is_valid_ip_address(const char *addr)
; while ( *(addr + i) )
} ++i;
} i = j = value = count = 0; 
memset(buf, 0, sizeof(buf));
while ( *(addr + i) )
}if(*(addr + i) == 0x0a) // linux.
} 
/*if(num == 4)
*///printf(" ******** %d %s %d\n", i, (addr + i),strlen(addr + i));
printf("@@@@@@@@@ :%s \n",(addr + i));
if (( ! isdigit(*(addr + i)) ) && (num != 4))
*(buf + j) = *(addr + i);
++i;
++j;
}*(buf + j) = '\0';
//if(num == 4)
///if ( *(addr + i) == '.' )
else
}printf("buf = %s %d \n",buf, strlen(buf));
//m = strlen(buf)-2;
m = strlen(buf);
for(k=0;k>>>>>>>> \n",str);
#if 1
struct in_addr addr;
int ret;
volatile int local_errno;
errno = 0;
ret = inet_pton(af_inet, str, &addr);
local_errno = errno;
if (ret > 0)
fprintf(stderr, "\"%s\" is a valid ipv4 address\n", str);
else if (ret < 0)
fprintf(stderr, "eafnosupport: %s\n", strerror(local_errno));
else 
fprintf(stderr, "\"%s\" is not a valid ipv4 address\n", str);
return ret;
#endif
}#endif
int main(void)
; char cmd_mask[64] = ;
char cmd_gw[64] = ;
if( (fp=fopen(file_name,"r"))==null )
fgets(ip, 20, fp);
fgets(mask, 20, fp);
fgets(gateway, 20, fp);
//printf("check : %d \n",is_valid_ip_address(ip));
if(is_valid_ip_address(ip))
else
return 0;
}

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