HW12/p-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>
#include <signal.h>
#include <assert.h>
#include <fcntl.h>
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#include <sys/wait.h>
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#include "socket_wrapper.h"
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static const int MAX_LISTEN_SOCKET = 16;
#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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/*========
*Operation
*========*/
/**
* send user error message
* 80 character limit
* thread safe
*/
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");
return -1;
}
if (send(sock,msg,res.error_msg_size,0) < 0){
perror("error msg send");
return -1;
}
return 0;
}
/**
* send errno to client
* thread safe
*/
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;
}
/**
* return fd, if success. otherwise, return -1.
* thread safe
*/
int read_request(int sock,uint8_t * buf,size_t bufsize){
struct ReadOp p;
int fd;
ssize_t n = recv_until_byte(sock,&p,sizeof(p),TIMEOUT);
if (n < 0){
if (n == -2) fprintf(stderr,"timeout!");
else perror("receive fail");
return -1;
}
if(bufsize <= ((size_t)p.file_url_size) + sizeof(p) + 1){
send_fail(sock,"buffer overflow");
return -1;
}
else if(p.file_url_size + 1 > MAX_PATH_SIZE){
send_fail(sock,"max path fail");
return -1;
}
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);
buf[p.file_url_size] = '\0'; //truncate
fprintf(stdout,"str size: %d, request %s\n",p.file_url_size,buf);
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;
}
/**
* send response to client
* thread safe
*/
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");
return -1;
}
#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");
return -1;
}
}
#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");
return -1;
}
if(send(sock,buf,readed,0)<0){
perror("send response send fail");
return -1;
}
offset += readed;
}
#endif
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]);
return 2;
}
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
return 2;
}
}
else return 2; //failed to find argument.
}
}
return 0;
}
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static int sock;
void safe_exit(){
close(sock);
}
int main(int argc, const char *argv[]){
uint8_t * buf;
struct sockaddr_in addr;
struct sockaddr_in client_addr;
socklen_t client_addr_len = sizeof(client_addr);
int csock;
int bufsize;
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);
atexit(safe_exit);
if(sock < 0){
perror("sock create fail");
return 1;
}
else {
int option = 1;
if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&option,sizeof(option)) < 0){
perror("setsockopt");
}
}
bufsize = getBufferSizeFrom(sock);
buf = malloc(bufsize * sizeof(*buf));
if (buf == NULL){
fprintf(stderr,"lack of memory");
return 1;
}
addr.sin_addr.s_addr = htonl(INADDR_ANY); /*0.0.0.0 모든 네트워크 인터페이스에 묶임.*/
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");
return 1;
} else {
char ip_buf[INET_ADDRSTRLEN];
const char * msg = inet_ntop(AF_INET,&addr.sin_addr,ip_buf,sizeof(ip_buf));
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;
}
for (i = 0; i < 3; i++)
{
int fd, pid;
char ip_buf[INET_ADDRSTRLEN];
const char * msg;
if((csock = accept(sock, (struct sockaddr *)&client_addr,&client_addr_len)) < 0){
free(buf);
perror("accept error");
return 1;
}
msg = inet_ntop(AF_INET,&addr.sin_addr,ip_buf,sizeof(ip_buf));
fprintf(stderr,"Connected on : %s:%d\n",msg == NULL ? "(null)" : msg , ntohs(addr.sin_port));
pid = fork();
if(pid == 0){
if((fd = read_request(csock,buf,bufsize)) > 0){
send_response(csock,fd,buf,bufsize);
close(fd);
}
if(close(csock) < 0)
perror("csock close error");
free(buf);
return 0;
}
}
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for (i = 0; i < 3; i++)
{
int retval;
int pid = wait(&retval);
printf("[%d] %d: %d\n",i,pid,retval);
}
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free(buf);
return 0;
}