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server.c
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server.c
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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 <netinet/in.h>
#include <pthread.h>
#include <fcntl.h>
#include "posts.h"
#define BUF_SIZE 100
#define MAX_CLNT 256
#define MAX_SEATS 30
#define MAXBUF 1024
void* handle_clnt(void * arg);
void error_handling(char * msg);
int sign_up(char *id, char *pw);
int clnt_cnt=0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutex1;
pthread_mutex_t mutex2;
typedef struct LoginData{
int ClientFd;
char ID[10];
char PASSWORD[MAXBUF];
}LoginData;//클라이언트의 ID와 PASSWORD를 저장하는 구조체
void send_msg(int client, char * msg, int len);
int handle_rcvmsg(int clnt_sock, LoginData info);
int Login(LoginData * input);
void open_file(int clnt_sock);
void p_refresh(int clnt_sock);
void delete_a_post(int clnt_sock);
int main(int argc, char *argv[])
{
int serv_sock, clnt_sock;
struct sockaddr_in serv_adr, clnt_adr;
socklen_t clnt_adr_sz;
pthread_t t_id;
if(argc!=2)
{
printf("Usage : %s <port>\n", argv[0]);
exit(1);
}
pthread_mutex_init(&mutex1, NULL);
pthread_mutex_init(&mutex2, NULL);
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, 5)==-1)
error_handling("listen() error");
while(1)
{
clnt_adr_sz=sizeof(clnt_adr);
clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr,&clnt_adr_sz);
pthread_mutex_lock(&mutex1);
clnt_socks[clnt_cnt++]=clnt_sock;
pthread_mutex_unlock(&mutex1);
pthread_create(&t_id, NULL, handle_clnt, (void*)&clnt_sock);
pthread_detach(t_id);
printf("Connected client IP: %s , clnt_sock=%d\n", inet_ntoa(clnt_adr.sin_addr), clnt_sock);
}
close(serv_sock);
pthread_mutex_destroy(&mutex1);
pthread_mutex_destroy(&mutex2);
return 0;
}
void open_file(int clnt_sock){
int fd;
struct post p;
if( ( fd = open("post_data", O_WRONLY | O_CREAT | O_APPEND, 0666 ) ) == -1 ){
fprintf(stderr, "can't open 'post_data' file\n");
exit(1);
}
read(clnt_sock, &p, sizeof(p));
write(fd, &p, sizeof(p));
close(fd);
}
void p_refresh(int clnt_sock){
int fd;
struct post temp;
struct post *plist;
int sum = 0;
int year, month, day;
int i;
read(clnt_sock, (int *)&year, sizeof(int));
read(clnt_sock, (int *)&month, sizeof(int));
read(clnt_sock, (int *)&day, sizeof(int));
year = (int)year;
month = (int )month;
day = (int )day;
if ( ( fd = open("post_data", O_RDONLY | O_CREAT, 0666) ) == -1 ){
fprintf(stderr,"can't open 'post_data' file\n");
exit(1);
}
while( read(fd, &temp, sizeof(struct post) ) > 0 ){
if( temp.year==year && temp.month==month && temp.day == day ){
if( sum == 0 ){
sum++;
MALLOC(plist,sizeof(*plist));
plist[0] = temp;
}
else{
REALLOC(plist,sizeof(*plist)*(sum+1));
plist[sum] = temp;
sum++;
}
}
}
close(fd);
write(clnt_sock, (int *)&sum, sizeof(int));
for(i = 0;i<sum;i++){
write(clnt_sock,&plist[i], sizeof(struct post));
}
//write(clnt_sock, (struct post *)plist, sizeof(struct post)*sum);
if( sum > 0 ) free(plist);
}
void delete_a_post(int clnt_sock){
int fd;
int len = 0;
int sum = 0;
int i;
int iffind = 0;
int ifmal = 0;
struct post p;
struct post temp;
struct post *pp;
char clnt_ID[10];
int good = 0;
int fail = 1;
if( ( fd = open("post_data", O_RDWR ) ) == -1 ){
fprintf(stderr,"cannot open 'post_data' file\n");
exit(1);
}
read(clnt_sock, &p, sizeof(p));
read(clnt_sock, clnt_ID, sizeof(clnt_ID));
while( read(fd, &temp, sizeof(struct post)) > 0 ){
if( !strcmp(p.ID,clnt_ID) && !strcmp(temp.ID,p.ID) && !strcmp(temp.title,p.title) && !strcmp(temp.time,p.time) ){ //check ID, tile, time -> What are we gonna delete?
iffind = 1;
while( read(fd, &temp, sizeof(struct post)) > 0){
if( sum == 0 ){
sum++;
MALLOC(pp,sizeof(*pp));
pp[0] = temp;
ifmal = 1;
len++;
}
else{
REALLOC(pp,sizeof(*pp)*(sum+1));
pp[sum] = temp;
sum++;
len++;
}
}
if( lseek(fd, -(sum+1)*sizeof(struct post), SEEK_CUR) == -1 ){
fprintf(stderr,"fseek error\n");
exit(1);
}
for( i = 0; i < sum; i++){
if( write(fd, &pp[i], sizeof(struct post)) == -1 ){
fprintf(stderr, "fwrite error\n");
exit(1);
}
}
break;
}
len++;
}
if( ftruncate(fd,len*sizeof(struct post)) == -1 ){
fprintf(stderr,"truncate error\n");
exit(1);
}
if( ifmal ){
free(pp);
write(clnt_sock, (int *)&good, sizeof(int));
}
else if( iffind == 1 ) write(clnt_sock, (int *)&good, sizeof(int));
else if( iffind == 0 ) write(clnt_sock, (int *)&fail, sizeof(int));
else fprintf(stderr,"delete error\n");
}
void *handle_clnt(void * arg)
{
LoginData person;
int clnt_sock=*((int*)arg);
int str_len=0, i;
char okay[MAXBUF] = "O";
char no[MAXBUF] = "X";
int select;
char checkbuffer[MAXBUF]={0,};
int ok = 0;//
int inst;
memset(&person, 0, sizeof(LoginData));
str_len=read(clnt_sock, checkbuffer, sizeof(checkbuffer));
if(strcmp(checkbuffer,"signin")==0)
{
select = 2;
}
if(strcmp(checkbuffer,"signup")==0)
{
select = 3;
}
if(select == 2)
{
//printf("%d\n",select);
str_len=read(clnt_sock, person.ID, sizeof(person.ID));
//printf("%s",person.ID);
str_len=read(clnt_sock, person.PASSWORD, sizeof(person.PASSWORD));
//printf("%s",person.PASSWORD);
if(str_len==-1)
{
error_handling("read() error!");
}
person.ClientFd = clnt_sock;
if( (handle_rcvmsg(clnt_sock, person)) >= 1)//okay
{
send_msg(clnt_sock,okay,1);
ok = 1;
}
else//no
{
send_msg(clnt_sock,no,1);
}
}
if(select == 3)
{
//printf("%d\n",select);
str_len=read(clnt_sock, person.ID, sizeof(person.ID));
str_len=read(clnt_sock, person.PASSWORD, sizeof(person.PASSWORD));
if(str_len==-1)
{
error_handling("read() error!");
}
person.ClientFd = clnt_sock;
int fd;
int flag;
FILE* fp_signup;
fp_signup = fopen("data.txt","a");
fd = fileno(fp_signup);
if((flag=fcntl(fd,F_GETFL))==-1){
perror("fcntlfailed");
exit(1);
}
flag |=O_APPEND;
if ((fcntl(fd, F_SETFL, flag)) == -1) {
perror("fcntl failed");
exit(1);
}
fprintf(fp_signup,"%s %s\n",person.ID,person.PASSWORD);
fclose(fp_signup);
send_msg(clnt_sock,okay,1);
}
if( ok == 1 ){
while(1){
str_len = read(clnt_sock,(int *) &inst, sizeof(int));
switch(inst){
case 3:
open_file(clnt_sock);
break;
case 4:
delete_a_post(clnt_sock);
break;
case 5:
p_refresh(clnt_sock);
break;
case 999:
break;
}
if (inst == 999) break;
}
}
pthread_mutex_lock(&mutex1);
for(i=0; i<clnt_cnt; i++) // remove disconnected client
{
if(clnt_sock==clnt_socks[i])
{
printf("clnt_sock=%d, i=%d\n", clnt_sock, i);
while(i < clnt_cnt){
clnt_socks[i]=clnt_socks[i+1];
i++;
}
break;
}
}
clnt_cnt--;
pthread_mutex_unlock(&mutex1);
close(clnt_sock);
return NULL;
}
int handle_rcvmsg(int clnt_sock, LoginData info)
{
//printf("handle_rcvmsg\n");
FILE* fp;
char loginData[MAXBUF];
int flag = 0;
fp = fopen("data.txt","r");
while(!feof(fp))
{
flag =0;
//printf("!!\n");
fgets(loginData,sizeof(loginData),fp);
//printf("file ID PW: %s",loginData);
char *temp = strtok(loginData," "); //공백을 기준으로 문자열 자르기
if(strcmp(info.ID,temp)==0)
{
flag++;
//printf("%d\n",flag);
}
temp = strtok(NULL, " ");//널문자를 기준으로 다시 자르기
if((strcmp(info.PASSWORD,temp)==0))
{
flag++;
//printf("%d\n",flag);
}
if(flag >= 1)
{
break;
}
}
return flag;
}
void send_msg(int client, char * msg, int len)// send to all
{
pthread_mutex_lock(&mutex1);
//printf("send_msg: clnt_socks: %d connect!\n", client);
write(client, msg, len);
pthread_mutex_unlock(&mutex1);
}
void error_handling(char * msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(1);
}