NETWORK

/* * HTTPServer.c * Written by SW. YOON */ #include #include #include #include #include #include #include #include #include #include #define BUFSIZE 1024 #define LINESIZE 100 void * clnt_connection(void *arg); char* strtrim(char *str); 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; int clnt_sock; struct sockaddr_in serv_addr; struct sockaddr_in clnt_addr; int clnt_addr_size; char buf[BUFSIZE]; pthread_t thread; if(argc!=2){ printf("Usage : %s \n", argv[0]); exit(1); } serv_sock=socket(PF_INET, SOCK_STREAM, 0); if(serv_sock==-1) error_handling("socket() error"); memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(atoi(argv[1])); if(bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1) error_handling("bind() error"); if(listen(serv_sock, 20)==-1) error_handling("listen() error"); while (1) { clnt_addr_size=sizeof(clnt_addr); clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size); printf("연결요청 : %s:%d\n", inet_ntoa(clnt_addr.sin_addr), ntohs(clnt_addr.sin_port)); pthread_create(&thread, NULL, clnt_connection, &clnt_sock); } return 0; } void * clnt_connection(void *arg) { int clnt_sock=*((int*)arg); char req_line[LINESIZE]; 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, LINESIZE, clnt_read); fputs(req_line, stdout); if(strstr(req_line, "HTTP/")==NULL){ send_error(clnt_write); fclose(clnt_read); fclose(clnt_write); return; } 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; } while(1){ fgets(req_line, LINESIZE, clnt_read); fputs(req_line, stdout); if(strcmp(strtrim(req_line),"")==0) break; } fclose(clnt_read); send_data(clnt_write, ct, file_name); } char* strtrim(char *str) { int end=strlen(str); while(str[end]<=' ' && end>0) end--; str[end+1]=0; while(*str<=' ' && *str!=0) str++; return str; } void send_data(FILE* fp, char* ct, char* file_name) { char protocol[]="HTTP/1.0 200 OK\r\n"; char server[]="Server:Best Http Server \r\n"; char cnt_len[50]; char cnt_type[LINESIZE]; char buf[BUFSIZE]; struct stat s; FILE* send_file; int len; stat(file_name, &s); sprintf(cnt_type, "Content-type:%s\r\n\r\n", ct); sprintf(cnt_len, "Content-length:%lu\r\n\r\n", s.st_size); send_file = fopen(file_name, "r"); if(send_file == NULL){ send_error(fp); return; } /* 헤더 정보 전송 */ fputs(protocol, fp); fputs(server, fp); fputs(cnt_len, fp); fputs(cnt_type, fp); /* 요청 데이터 전송 */ //printf("\ntest\n"); while( len=fgets(buf, BUFSIZE, send_file ) != 0) { // printf("%c",buf[BUFSIZE]); fputs(buf, fp); fflush(fp); } //printf("\n"); fflush(fp); fclose(fp); } char* content_type(char* file){ char extension[LINESIZE]; char file_name[LINESIZE]; strcpy(file_name, file); strtok(file_name, "."); strcpy(extension, strtok(NULL, ".")); if(!strcmp(extension, "html")||!strcmp(extension, "htm")) return "text/html"; if(!strcmp(extension, "txt")||!strcmp(extension, "c")) return "text/plain"; return "text/plain"; } void send_error(FILE* fp) { char protocol[]="HTTP/1.0 400 Bad Request\r\n"; char server[]="Server:Best Http Server \r\n"; char cnt_len[]="Content-length:20480\r\n"; char cnt_type[]="Content-type:text/html\r\n\r\n"; char content[]="NETWORK" "
오류 발생! 요청 파일명 및 요청 방식 확인!" ""; 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); }