Socket-Programming-Practice/webserv_linux.c at master · knon0501/Socket-Programming-Practice · GitHub

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <pthread.h>

#define BUF_SIZE 1024
#define SMALL_BUF 100

void *request_handler(void *arg);
void send_data(FILE *fp, char * ct,char * file_name);
char * content_type(char * file);
void send_error(FILE *fp);
void error_handling(char *message);

int main(int argc,char *argv[])
{
    int serv_sock,clnt_sock;
    struct sockaddr_in serv_adr,clnt_adr;
    int clnt_adr_size;
    char buf[BUF_SIZE];
    pthread_t t_id;
    if(argc!=2){
        printf("Usage : %s <port>\n",argv[0]);
        exit(1);
    }
    serv_sock=socket(PF_INET,SOCK_STREAM,0);
    memset(&serv_adr,0,sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;
    serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
    serv_adr.sin_port=htons(atoi(argv[1]));
    if(bind(serv_sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
        error_handling("bind() error");
    if(listen(serv_sock,20)==-1)
        error_handling("listen() error");

    while(1)
    {
        clnt_adr_size=sizeof(clnt_adr);
        clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_adr,&clnt_adr_size);

        printf("Connection Request : %s:%d\n",
        inet_ntoa(clnt_adr.sin_addr),ntohs(clnt_adr.sin_port));

        pthread_create(&t_id,NULL,request_handler,&clnt_sock);
        pthread_detach(t_id);
    }
    close(serv_sock);
    return 0;
}

void * request_handler(void *arg)
{
  //  printf("$");
    int clnt_sock=*((int*)arg);
    char req_line[SMALL_BUF];
    FILE *clnt_read;
    FILE *clnt_write;

    char method[10];
    char ct[15];
    char file_name[30];

    clnt_read=fdopen(clnt_sock,"r");
    clnt_write=fdopen(dup(clnt_sock),"w");
    fgets(req_line,SMALL_BUF,clnt_read);

   // printf("?");
    if(strstr(req_line,"HTTP/")==NULL)
    {
        send_error(clnt_write);
        fclose(clnt_read);
        fclose(clnt_write);
        return NULL;
    }
   // printf("!");
    strcpy(method,strtok(req_line," /"));
    strcpy(file_name,strtok(NULL," /"));
    strcpy(ct, content_type(file_name));
    if(strcmp(method,"GET")!=0)
    {

        send_error(clnt_write);
        fclose(clnt_read);
        fclose(clnt_write);
        return NULL;
    }
   // printf("*");
    fclose(clnt_read);
    send_data(clnt_write,ct,file_name);
   // printf("^^");
    return NULL;
}

void send_data(FILE *fp,char *ct,char * file_name)
{
    char protocol[]="HTTP/1.0 200 OK\r\n";
    char server[]="Server:Linux Web Server\r\n";
    char cnt_len[]="Content-length:2048\r\n";
    char cnt_type[SMALL_BUF];
    char buf[BUF_SIZE];
    FILE *send_file;

    sprintf(cnt_type,"Content-type:%s\r\n\r\n",ct);
    //printf("%s",file_name);
    send_file=fopen(file_name,"r");


    if(send_file==NULL)
    {
        send_error(fp);
        return;
    }

    fputs(protocol,fp);
    fputs(server,fp);
    fputs(cnt_len,fp);
    fputs(cnt_type,fp);

    while(fgets(buf,BUF_SIZE,send_file)!=NULL)
    {
        //puts(buf);
        fputs(buf,fp);
        fflush(fp);
    }
    fflush(fp);
    fclose(fp);

}

char* content_type(char *file)
{
    char extension[SMALL_BUF];
    char file_name[SMALL_BUF];
    strcpy(file_name,file);
    strtok(file_name,".");
    strcpy(extension,strtok(NULL,"."));
    if(!strcmp(extension,"html") || !strcmp(extension,"htm"))
        return "text/html";
    else
        return "text/plain";
}

void send_error(FILE *fp)
{
    char protocol[]="HTTP/1.0 400 Bad Request\r\n";
    char server[]="Server:Linux Web Server \r\n";
    char cnt_len[]="Content-length:2048\r\n";
    char cnt_type[SMALL_BUF]="Content-type:text/html\r\n\r\n";
    char content[]="<html><head><title>NETWORK</title></head>"
    "<body><font size=+5><br>오류 발생! 요청 파일명 및  요청 방식 확인!"
    "</font></body></html>";

    fputs(protocol,fp);
    fputs(server,fp);
    fputs(cnt_len,fp);
    fputs(cnt_type,fp);
    fflush(fp);
}
void error_handling(char *message)
{
    fputs(message,stderr);
    fputc('\n',stderr);
    exit(1);
}