logincheck.c

Linux环境登陆源码

#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include "usrdb.h"

#define connfd STDOUT_FILENO
#define db "/mysrc/network/loginserver/usr.db"
#define settimeout(s) alarm(s)
#define cleanclock() alarm(0)

void sig_timeout(int);
int main(void)
{
   char buf[255], id[15], pwd[15];
   int n;
   FILE *dbp;
   struct user usr;
   
   signal(SIGALRM, sig_timeout);
   settimeout(10);	/* timeout when 10 sec */
   if((n=read(connfd, buf, sizeof(buf))) < 0)
      exit(-1);
   cleanclock();	/* clean timeout clock */
buf[n] = 0;
write(connfd, buf, strlen(buf));
exit(0);
   sscanf(buf, "%s\t%s", id, pwd);
   if((dbp = ropendb(db)) == NULL)
      exit(-1);

   if(getusrbyid(dbp, id, &usr) < 0)
   {write(connfd, "no user", 7);exit(0);}
   if(strcmp(pwd, usr.pwd) != 0)
   {write(connfd, "password error!", 15);exit(0);}

   write(connfd, "login...", 8);
   sprintf(buf, "\n\tWelcome %s\n\t^_^!!!!!!!!!!!!!!!!!!!!\n\tTest End\n\tBye Bye .\n", id);
   write(connfd, buf, strlen(buf));
   exit(0);
   
}

void sig_timeout(int signo)
{
   char mesg[] = "timeout";
   write(connfd, mesg, strlen(mesg));
   exit(5);
}