HW12/server.c

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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <errno.h>
#include <sys/stat.h>
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#include <signal.h>
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#include <assert.h>
#include <fcntl.h>
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#include <pthread.h>
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#include "socket_wrapper.h"
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#include "simple_circular_buffer.h"
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#ifndef DEFAULT_MAX_LISTEN_SOCKET
static const int MAX_LISTEN_SOCKET = 16;
#else
static const int MAX_LISTEN_SOCKET = DEFAULT_MAX_LISTEN_SOCKET;
#endif
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#ifdef USE_SENDFILE
#include <sys/sendfile.h>
#ifndef DEFAULT_SEND_FILE_CHUNK_SIZE
const size_t SEND_FILE_CHUNK_SIZE = 0x100000; /*1MB*/
#else
const size_t SEND_FILE_CHUNK_SIZE = DEFAULT_SEND_FILE_CHUNK_SIZE; /*1MB*/
#endif
#endif
#ifndef DEFAULT_SERVER_PORT
static const in_port_t SERVER_PORT = 9091;
#else
static const in_port_t SERVER_PORT = DEFAULT_SERVER_PORT;
#endif
#ifndef DEFAULT_MAX_PATH_SIZE
/*0 < x < MAX_PATH_SIZE*/
static const uint16_t MAX_PATH_SIZE = 256;
#else
static const uint16_t MAX_PATH_SIZE = DEFAULT_MAX_PATH_SIZE;
#endif
#ifndef DEFAULT_TIMEOUT
static const int TIMEOUT = 5;
#else
static const int TIMEOUT = DEFAULT_TIMEOUT;
#endif
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enum{
#ifndef DEFAULT_WORK_QUEUE_SIZE
WORK_QUEUE_SIZE = 10,
#else
WORK_QUEUE_SIZE = DEFAULT_WORK_QUEUE_SIZE,
#endif
#ifndef DEFAULT_MAX_THREAD_NUMBER
MAX_THREAD_NUMBER = 10
#else
MAX_THREAD_NUMBER = DEFAULT_MAX_THREAD_NUMBER
#endif
};
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/*========
*Operation
*========*/
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/**
* send user error message
* 80 character limit
* thread safe
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*/
int send_fail(int sock,const char * msg){
struct TransferResult res;
res.res = RES_USR_ERR;
res.file_size = 0;
res.err_number = 0;
res.error_msg_size = strlen(msg);
//os will be combining if tcp_autocorking emabled.
if(send(sock,&res,sizeof(res),0) < 0){
perror("error msg send");
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return -1;
}
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if (send(sock,msg,res.error_msg_size,0) < 0){
perror("error msg send");
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return -1;
}
return 0;
}
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/**
* send errno to client
* thread safe
*/
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int send_errno(int sock){
struct TransferResult r;
r.res = RES_ERR;
r.err_number = errno;
r.file_size = 0;
r.error_msg_size = 0;
if(send(sock,&r,sizeof(r),0)){
perror("errno send");
return -1;
}
return 0;
}
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/**
* return fd, if success. otherwise, return -1.
* thread safe
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*/
int read_request(int sock,uint8_t * buf,size_t bufsize){
struct ReadOp p;
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int fd;
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ssize_t n = recv_until_byte(sock,&p,sizeof(p),TIMEOUT);
if (n < 0){
if (n == -2) fprintf(stderr,"timeout!");
else perror("receive fail");
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return -1;
}
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if(bufsize <= ((size_t)p.file_url_size) + sizeof(p) + 1){
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send_fail(sock,"buffer overflow");
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return -1;
}
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else if(p.file_url_size + 1 > MAX_PATH_SIZE){
send_fail(sock,"max path fail");
return -1;
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}
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else if(p.file_url_size == 0){
send_fail(sock,"filename zero fail");
return -1;
}
n = recv_until_byte(sock,buf,p.file_url_size,TIMEOUT);
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buf[p.file_url_size] = '\0'; //truncate
fprintf(stdout,"str size: %d, request %s\n",p.file_url_size,buf);
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if(strchr((char *)buf,'/') != NULL){
send_fail(sock,"Illegal character /");
return -1;
}
fd = open((char *)buf,O_RDONLY);
if(fd < 0){
send_errno(sock);
close(fd);
return -1;
}
return fd;
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}
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/**
* send response to client
* thread safe
*/
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int send_response(int sock,int fd, uint8_t * buf, size_t bufsize){
struct TransferResult r;
struct stat st;
off_t offset = 0;
ssize_t readed = 0;
r.res = RES_OK;
r.err_number = 0;
r.error_msg_size = 0;
if(fstat(fd,&st) < 0){
return send_errno(sock);
}
if(S_ISDIR(st.st_mode)){
return send_fail(sock,"is a directory");
}
r.file_size = st.st_size;
if(send(sock,&r,sizeof(r),0)<0){
perror("send fail");
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return -1;
}
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#ifdef USE_SENDFILE
while (r.file_size != offset)
{
size_t count = SEND_FILE_CHUNK_SIZE < (r.file_size - offset) ? SEND_FILE_CHUNK_SIZE : (r.file_size - offset);
if((readed = sendfile(sock,fd,&offset,count)) < 0){
perror("send file fail");
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return -1;
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}
}
#else
while (offset < r.file_size)
{
readed = bufsize < (r.file_size - offset) ? bufsize : r.file_size - offset;
if(read(fd,buf,readed)<0){
perror("send response read fail");
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return -1;
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}
if(send(sock,buf,readed,0)<0){
perror("send response send fail");
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return -1;
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}
offset += readed;
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}
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#endif
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return 0;
}
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const char * help(const char * n){
const char * msg = "USASE : %s [Option] ...\n"
"Options and arguments: \n"
"-p port\t:set to port binding. couldn't set to 0\n"
"-h\t:print help message.\n";
printf(msg,n);
return msg;
}
/** return 0 ok. otherwise invalid format*/
int parse_args(int argc,const char * argv[] , in_port_t * port){
int pos = 1;
const char * opt;
while (pos < argc)
{
opt = argv[pos++];
if (strcmp(opt,"-h") == 0 || strcmp(opt,"--help") == 0)
{
help(argv[0]);
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return 0;
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}
else if(strcmp(opt,"-p") == 0 || strcmp(opt,"--port") == 0){
if (pos < argc){
const char * value = argv[pos++];
*port = atoi(value);
if (port == 0){ // either not number or zero
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fprintf(stderr,"argument is either not number or zero\n");
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return 2;
}
}
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else{
fprintf(stderr,"need argument\n");
return 2; //failed to find argument.
}
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}
}
return 0;
}
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//============
//Simple Thread Pool
//============
typedef struct SharedState{
//empty if less than 0
queue_struct(int,WORK_QUEUE_SIZE) socks;
pthread_mutex_t sock_mutex;
pthread_cond_t ready;
//int progress[MAX_THREAD_NUMBER];
} shared_state_t;
void init_shared_state(shared_state_t * state) {
queue_init(&state->socks);
pthread_mutex_init(&state->sock_mutex,NULL);
pthread_cond_init(&state->ready,NULL);
}
//
typedef struct WorkerArgument
{
int id;
int bufsize;
uint8_t * buf;
//pthread_mutex_t * cond_mutex;
//pthread_cond_t cond;
} worker_argument_t;
__attribute__((malloc)) worker_argument_t * create_worker_argument(int id, int bufsize){
worker_argument_t * ret = (worker_argument_t *)malloc(sizeof(worker_argument_t));
if (ret == NULL) return ret;
ret->id = id;
ret->bufsize = bufsize;
ret->buf = (uint8_t *)malloc(sizeof(*ret->buf)*bufsize);
if(ret->buf == NULL){
free(ret);
ret = NULL;
}
return ret;
}
static shared_state_t globalState;
void * worker_proc(void * data){
worker_argument_t * args = (worker_argument_t *)data;
int fd, csock;
for(;;){
pthread_mutex_lock(&globalState.sock_mutex);
while (queue_isempty(&globalState.socks)){
pthread_cond_wait(&globalState.ready,&globalState.sock_mutex);
}
csock = dequeue(&globalState.socks);
pthread_mutex_unlock(&globalState.sock_mutex);
if((fd = read_request(csock,args->buf,args->bufsize)) > 0){
send_response(csock,fd,args->buf,args->bufsize);
close(fd);
}
if(close(csock) < 0)
perror("csock close error");
}
}
static pthread_t worker_threads[MAX_THREAD_NUMBER];
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static int sock;
void safe_exit(){
close(sock);
}
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int main(int argc, const char *argv[]){
struct sockaddr_in addr;
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struct sockaddr_in client_addr;
socklen_t client_addr_len = sizeof(client_addr);
int csock;
int bufsize;
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int i;
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in_port_t binding_port_number = SERVER_PORT;
if (argc > 1){
int d = parse_args(argc,argv,&binding_port_number);
if(d != 0 ) return d;
}
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sock = socket(AF_INET,SOCK_STREAM,0);
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atexit(safe_exit);
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if(sock < 0){
perror("sock create fail");
return 1;
}
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else {
int option = 1;
if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&option,sizeof(option)) < 0){
perror("setsockopt");
}
}
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init_shared_state(&globalState);
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bufsize = getBufferSizeFrom(sock);
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for (i = 0; i < MAX_THREAD_NUMBER; i++) {
worker_argument_t * args = create_worker_argument(i,bufsize);
if (args == NULL) {
fprintf(stderr,"malloc: lack of memory");
return 1;
}
pthread_create(&worker_threads[i],NULL,worker_proc,args);
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}
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addr.sin_addr.s_addr = htonl(INADDR_ANY); /*0.0.0.0 모든 네트워크 인터페이스에 묶임.*/
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addr.sin_family = AF_INET;
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addr.sin_port = htons(binding_port_number);
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if(bind(sock, (struct sockaddr *)&addr,sizeof(addr)) < 0){
perror("bind failed");
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return 1;
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} else {
char ip_buf[INET_ADDRSTRLEN];
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const char * msg = inet_ntop(AF_INET,&addr.sin_addr,ip_buf,sizeof(ip_buf));
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assert(msg != NULL);
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fprintf(stderr,"server bind on %s:%d\n",msg ,binding_port_number);
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}
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if(listen(sock,MAX_LISTEN_SOCKET) < 0){
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perror("listen failed");
return 1;
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}
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while ((csock = accept(sock, (struct sockaddr *)&client_addr,&client_addr_len)) >= 0)
{
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char ip_buf[INET_ADDRSTRLEN];
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const char * msg = inet_ntop(AF_INET,&client_addr.sin_addr,ip_buf,sizeof(ip_buf));
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fprintf(stderr,"Connected on : %s:%d\n",msg == NULL ? "(null)" : msg , ntohs(addr.sin_port));
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for(;;){
pthread_mutex_lock(&globalState.sock_mutex);
if (queue_isfull(&globalState.socks)){
pthread_mutex_unlock(&globalState.sock_mutex);
#ifdef _GNU_SOURCE
pthread_yield();
#else
usleep(400);
#endif
continue;
}
else enqueue(&globalState.socks,csock);
break;
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}
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pthread_mutex_unlock(&globalState.sock_mutex);
pthread_cond_signal(&globalState.ready);
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}
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return 1;
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}