#include <sys/types.h>
#include <sys/param.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netdb.h>
#include <unistd.h>

#define LOG_DIRECTORY "/usr/local/apache/share/kanada-lab/staff/kanada/log2/"

int main(int argc,char *argv[])
{
    int i,j;
    FILE *file;
    char *addr,*http_referer,*http_user_agent;
    char *hostname;
    char filename[256],strTime[256],account[256];
    unsigned char byte[4]; 
    time_t ct;
    struct hostent *host;

    if( argc!=2 ){
        printf("Usage: wwwlog filename\n");
        exit(0); 
    }
    addr=getenv("REMOTE_ADDR");
    http_referer=getenv("HTTP_REFERER");
    http_user_agent=getenv("HTTP_USER_AGENT");
    if ( addr==NULL ){
       printf("Unexpected error!\n");
       exit(0);
    }
    for(i=j=0;i<3;i++){
       byte[i]=addr[j++]-'0';
       while(addr[j]!='.') byte[i] = byte[i]*10 + addr[j++]-'0';
       j++;
    }
    byte[3]=addr[j++]-'0';
    while(addr[j]!='\0') byte[3] = byte[3]*10 + addr[j++]-'0';

    host=gethostbyaddr(byte,4,2);
    if( host==NULL ) hostname=addr;
    else hostname=host->h_name;

    strcpy(filename,LOG_DIRECTORY);
    strcat(filename,argv[1]);
    ct=time(NULL);
    strftime(strTime,(size_t)256,"%Y/%m/%d %H:%M:%S",localtime(&ct));
    file=fopen(filename,"a");
    if( http_referer==NULL ){
       fprintf(file,"%s %s - %s\n",strTime,hostname,http_user_agent);
    }else{
       fprintf(file,"%s %s %s %s\n",strTime,hostname,http_referer,
	       http_user_agent);
    }
    fclose(file);
    printf("<!--#exec cmd=\"/home/sites/site1/users/kuroda/wwwlog %s\"-->",argv[1]);
}