自己写了个子程序.用来关闭linux的网络服务.

自己写了个子程序.用来关闭linux的网络服务.就是对/etc/servies文件的操作.

 

 

运行如下:

./程序名 open[close] 服务名

 

 

#include

enum{open,close};

char* yi_wei(char *server_save,int flag)
{
int i;
char *r_w,*p;
r_w=(char *)malloc(100* sizeof(char));

if(flag==1)
{

*(r_w)='#';
for(i=0;*(server_save+i)!='\0'&&*(server_save+i)!='\n';i++)
*(r_w+i+1)=*(server_save+i);
*(r_w+i+1)='\n';
*(r_w+i+2)='\0';

}
else
{

 for(i=0;*(server_save+i)!='\0'&&*(server_save+i)!='\n';i++)
 {
 if( *(server_save+i+1)=='\0')break;
 *(r_w+i)=*(server_save+i+1);
 *(r_w+i+1)='\0';
 }
 

}

memset(server_save,' ',100);
strcpy(server_save,r_w);

free(r_w);
return server_save;
}
void off(int argc,char *argv[],char *server_save,FILE *tmp_s)
{

     char *p,*f_s;
     int i=0,count=0;
 
      for(;*(argv[2]+i)!='\0';i++ )
 {
 if( *(argv[2]+i)==*(server_save+i)  )
 count++;
 }
 if(i==count)
 {
  f_s=yi_wei(server_save,1);
  
  int i=0;
  i=0;
  while( *(server_save+i)!='\0')
  {
  fputc(*(server_save+i),tmp_s);
  i++;
  }
 }
 else
 {

  
  int b=0;
  while( *(server_save+b)!='\0')
  {
  fputc(*(server_save+b),tmp_s);
  b++;

  }
 }
}

 

void on(int argc,char *argv[],char *server_save,FILE *tmp_s)
{

      char *p,*f_s;
      int i=0,count=0;
 
      for(;*(argv[2]+i)!='\0';i++ )
 {
 if( (*(argv[2]+i)==*(server_save+i+1) )&& *(server_save)=='#')
 count++;
 }
 if(i==count)
 {
  
  f_s=yi_wei(server_save,0);
  int i=0;
  i=0;
  while( *(server_save+i)!='\0')
  {
  fputc(*(server_save+i),tmp_s);
  i++;
  }
  

 }
 else
 {
  int b=0;
  while( *(server_save+b)!='\0')
  {
  fputc(*(server_save+b),tmp_s);
  b++;

  }

 }
}

 

int main(int argc, char *argv[])
{
 char server_save[100];
 char *server_name="/etc/services";
 char *tmp_name="/etc/tmp_linux";
 int server_state;
 FILE *server_file,*tmp_s;
 int i;
 if(argc<3)
 {
 printf("usage: the wrong argument open/close+servername\n");
 exit(0);
 }
 if((server_file=fopen(server_name,"r+"))==NULL)
 {
  perror("can't not open server process");
  exit(0);
 }
 if((tmp_s=fopen(tmp_name,"w+"))==NULL)
 {
  perror("can't not open server process");
  exit(0);
 }
 fseek(server_file,0,SEEK_SET);
 if( strcmp("open",argv[1])==0)
 {
 server_state=open;
 }
 else if
 ( strcmp("close",argv[1])==0)
 {
 server_state=close;
 }
 else
 {
 printf("usage : it's not open or close\n");
 exit(0);
 }
  
 while(( fgets(server_save,100,server_file) ))

 {

 if(server_state==open)
 on(argc,argv,server_save,tmp_s);
  if(server_state==close)
 off(argc,argv,server_save,tmp_s);
 memset(server_save,' ',100);
  }
 if(unlink("/etc/services")<0)
 {
  perror("unlink failure");
  exit(0);
 }

 if( chdir("/etc")<0)
 {
 perror("can't chdir");
 exit(0);
 }
 
 if(rename("/etc/tmp_linux","/etc/services")<0)
 {
  perror("rename failure");
  exit(0);
 }
  printf("\n\n\n\n\nmy Master linuxcici, it's done <(A_A)>\n      THXY Colleg NetWork 042\n\n\n\n");
 fclose(server_file); 
 fclose(tmp_s);

}