299 lines
7.8 KiB
C
299 lines
7.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include <assert.h>
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#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;
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#ifdef USE_SENDFILE
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#include <sys/sendfile.h>
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#ifndef DEFAULT_SEND_FILE_CHUNK_SIZE
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const size_t SEND_FILE_CHUNK_SIZE = 0x100000; /*1MB*/
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#else
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const size_t SEND_FILE_CHUNK_SIZE = DEFAULT_SEND_FILE_CHUNK_SIZE; /*1MB*/
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#endif
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#endif
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#ifndef DEFAULT_SERVER_PORT
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static const in_port_t SERVER_PORT = 9091;
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#else
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static const in_port_t SERVER_PORT = DEFAULT_SERVER_PORT;
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#endif
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#ifndef DEFAULT_MAX_PATH_SIZE
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/*0 < x < MAX_PATH_SIZE*/
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static const uint16_t MAX_PATH_SIZE = 256;
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#else
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static const uint16_t MAX_PATH_SIZE = DEFAULT_MAX_PATH_SIZE;
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#endif
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#ifndef DEFAULT_TIMEOUT
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static const int TIMEOUT = 5;
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#else
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static const int TIMEOUT = DEFAULT_TIMEOUT;
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#endif
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/*========
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*Operation
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*========*/
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/**
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* send user error message
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* 80 character limit
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* thread safe
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*/
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int send_fail(int sock,const char * msg){
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struct TransferResult res;
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res.res = RES_USR_ERR;
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res.file_size = 0;
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res.err_number = 0;
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res.error_msg_size = strlen(msg);
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//os will be combining if tcp_autocorking emabled.
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if(send(sock,&res,sizeof(res),0) < 0){
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perror("error msg send");
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return -1;
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}
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if (send(sock,msg,res.error_msg_size,0) < 0){
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perror("error msg send");
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return -1;
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}
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return 0;
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}
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/**
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* send errno to client
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* thread safe
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*/
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int send_errno(int sock){
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struct TransferResult r;
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r.res = RES_ERR;
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r.err_number = errno;
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r.file_size = 0;
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r.error_msg_size = 0;
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if(send(sock,&r,sizeof(r),0)){
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perror("errno send");
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return -1;
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}
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return 0;
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}
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/**
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* return fd, if success. otherwise, return -1.
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* thread safe
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*/
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int read_request(int sock,uint8_t * buf,size_t bufsize){
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struct ReadOp p;
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int fd;
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ssize_t n = recv_until_byte(sock,&p,sizeof(p),TIMEOUT);
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if (n < 0){
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if (n == -2) fprintf(stderr,"timeout!");
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else perror("receive fail");
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return -1;
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}
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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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}
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else if(p.file_url_size + 1 > MAX_PATH_SIZE){
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send_fail(sock,"max path fail");
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return -1;
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}
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else if(p.file_url_size == 0){
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send_fail(sock,"filename zero fail");
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return -1;
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}
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n = recv_until_byte(sock,buf,p.file_url_size,TIMEOUT);
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buf[p.file_url_size] = '\0'; //truncate
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fprintf(stdout,"str size: %d, request %s\n",p.file_url_size,buf);
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if(strchr((char *)buf,'/') != NULL){
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send_fail(sock,"Illegal character /");
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return -1;
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}
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fd = open((char *)buf,O_RDONLY);
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if(fd < 0){
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send_errno(sock);
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close(fd);
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return -1;
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}
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return fd;
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}
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/**
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* send response to client
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* thread safe
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*/
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int send_response(int sock,int fd, uint8_t * buf, size_t bufsize){
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struct TransferResult r;
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struct stat st;
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off_t offset = 0;
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ssize_t readed = 0;
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r.res = RES_OK;
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r.err_number = 0;
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r.error_msg_size = 0;
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if(fstat(fd,&st) < 0){
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return send_errno(sock);
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}
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if(S_ISDIR(st.st_mode)){
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return send_fail(sock,"is a directory");
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}
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r.file_size = st.st_size;
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if(send(sock,&r,sizeof(r),0)<0){
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perror("send fail");
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return -1;
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}
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#ifdef USE_SENDFILE
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while (r.file_size != offset)
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{
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size_t count = SEND_FILE_CHUNK_SIZE < (r.file_size - offset) ? SEND_FILE_CHUNK_SIZE : (r.file_size - offset);
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if((readed = sendfile(sock,fd,&offset,count)) < 0){
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perror("send file fail");
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return -1;
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}
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}
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#else
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while (offset < r.file_size)
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{
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readed = bufsize < (r.file_size - offset) ? bufsize : r.file_size - offset;
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if(read(fd,buf,readed)<0){
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perror("send response read fail");
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return -1;
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}
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if(send(sock,buf,readed,0)<0){
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perror("send response send fail");
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return -1;
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}
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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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}
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const char * help(const char * n){
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const char * msg = "USASE : %s [Option] ...\n"
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"Options and arguments: \n"
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"-p port\t:set to port binding. couldn't set to 0\n"
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"-h\t:print help message.\n";
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printf(msg,n);
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return msg;
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}
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/** return 0 ok. otherwise invalid format*/
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int parse_args(int argc,const char * argv[] , in_port_t * port){
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int pos = 1;
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const char * opt;
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while (pos < argc)
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{
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opt = argv[pos++];
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if (strcmp(opt,"-h") == 0 || strcmp(opt,"--help") == 0)
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{
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help(argv[0]);
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return 2;
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}
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else if(strcmp(opt,"-p") == 0 || strcmp(opt,"--port") == 0){
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if (pos < argc){
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const char * value = argv[pos++];
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*port = atoi(value);
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if (port == 0){ // either not number or zero
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return 2;
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}
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}
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else return 2; //failed to find argument.
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}
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}
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return 0;
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}
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static int sock;
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void safe_exit(){
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close(sock);
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}
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int main(int argc, const char *argv[]){
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uint8_t * buf;
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struct sockaddr_in addr;
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struct sockaddr_in client_addr;
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socklen_t client_addr_len = sizeof(client_addr);
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int csock;
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int bufsize;
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int i;
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in_port_t binding_port_number = SERVER_PORT;
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if (argc > 1){
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int d = parse_args(argc,argv,&binding_port_number);
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if(d != 0 ) return d;
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}
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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){
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perror("sock create fail");
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return 1;
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}
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else {
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int option = 1;
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if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&option,sizeof(option)) < 0){
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perror("setsockopt");
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}
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}
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bufsize = getBufferSizeFrom(sock);
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buf = malloc(bufsize * sizeof(*buf));
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if (buf == NULL){
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fprintf(stderr,"lack of memory");
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return 1;
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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){
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perror("bind failed");
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return 1;
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} else {
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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");
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return 1;
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}
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for (i = 0; i < 3; i++)
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{
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int fd, pid;
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char ip_buf[INET_ADDRSTRLEN];
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const char * msg;
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int retval = 0;
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if((csock = accept(sock, (struct sockaddr *)&client_addr,&client_addr_len)) < 0){
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free(buf);
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perror("accept error");
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return 1;
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}
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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(client_addr.sin_port));
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pid = fork();
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if(pid == 0){
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if((fd = read_request(csock,buf,bufsize)) > 0){
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retval = send_response(csock,fd,buf,bufsize);
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close(fd);
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}
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else retval = fd;
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if(close(csock) < 0)
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perror("csock close error");
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free(buf);
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return retval;
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}
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}
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for (i = 0; i < 3; i++)
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{
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int retval;
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int pid = wait(&retval);
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printf("[%d] %d: %d\n",i,pid,retval);
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}
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free(buf);
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return 0;
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} |