/*
* Send the requested file.
*/
void
xmitfile(int peer, char *port, int fd, char *name, char *mode)
{
struct tftphdr *rp;
int n, i;
uint16_t block;
struct sockaddr_storage serv; /* valid server port number */
char recvbuffer[MAXPKTSIZE];
struct tftp_stats tftp_stats;
stats_init(&tftp_stats);
memset(&serv, 0, sizeof(serv));
rp = (struct tftphdr *)recvbuffer;
if (port == NULL) {
struct servent *se;
se = getservbyname("tftp", "udp");
((struct sockaddr_in *)&peer_sock)->sin_port = se->s_port;
} else
((struct sockaddr_in *)&peer_sock)->sin_port =
htons(atoi(port));
for (i = 0; i < 12; i++) {
struct sockaddr_storage from;
/* Tell the other side what we want to do */
if (debug&DEBUG_SIMPLE)
printf("Sending %s\n", name);
n = send_wrq(peer, name, mode);
if (n > 0) {
printf("Cannot send WRQ packet\n");
return;
}
/*
* The first packet we receive has the new destination port
* we have to send the next packets to.
*/
n = receive_packet(peer, recvbuffer,
MAXPKTSIZE, &from, timeoutpacket);
/* We got some data! */
if (n >= 0) {
((struct sockaddr_in *)&peer_sock)->sin_port =
((struct sockaddr_in *)&from)->sin_port;
break;
}
/* This should be retried */
if (n == RP_TIMEOUT) {
printf("Try %d, didn't receive answer from remote.\n",
i + 1);
continue;
}
/* Everything else is fatal */
break;
}
if (i == 12) {
printf("Transfer timed out.\n");
return;
}
if (rp->th_opcode == ERROR) {
printf("Got ERROR, aborted\n");
return;
}
/*
* If the first packet is an OACK instead of an ACK packet,
* handle it different.
*/
if (rp->th_opcode == OACK) {
if (!options_rfc_enabled) {
printf("Got OACK while options are not enabled!\n");
send_error(peer, EBADOP);
return;
}
parse_options(peer, rp->th_stuff, n + 2);
}
if (read_init(fd, NULL, mode) < 0) {
warn("read_init()");
return;
}
block = 1;
tftp_send(peer, &block, &tftp_stats);
read_close();
if (tftp_stats.amount > 0)
printstats("Sent", verbose, &tftp_stats);
txrx_error = 1;
}
sendRequestedFile(char* serverIP,char* portNo, char* fName){
int sockfd, newsockfd, portno,iofd;
int maxfd,connfd,maxi=-1;
int i,nready;
struct sockaddr_in serv_addr,server_addr;
int serv_len=sizeof(serv_addr);
socklen_t server_len =sizeof(server_addr);
int n;
char filename[128];
sockfd = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "sendRequestedFile entered");
if (sockfd < 0)
{
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "error opening socket");
server_clean(serverdata);
}
strcpy(serverdata.filename,fName);
sprintf(filename,"filename is %s",serverdata.filename);
__android_log_write(ANDROID_LOG_INFO, "tftp-client",filename);
memset((char *) &serv_addr,0, sizeof(serv_addr));
memset((char *) &server_addr,0, sizeof(server_addr));
portno = atoi(portNo);
serv_addr.sin_family = AF_INET;
inet_pton(AF_INET,serverIP,&serv_addr.sin_addr.s_addr);
serv_addr.sin_port = htons(portno);
maxfd=sockfd;
FD_ZERO(&allset);
FD_SET(sockfd, &allset);
printf("++++++++++++++++++++++++++Client starts+++++++++++++++++++++++++++\n");
serverdata.f=FileOpen(serverdata.filename);
if(serverdata.f==NULL)
{
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "File does not exist");
//send_error(k);
//clients[k].state=2;//state change to 2
server_clean(serverdata);
exit(1);
}
else
{
char filesize[128];
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "File found");
fseek (serverdata.f , 0 , SEEK_END);
serverdata.filesize = ftell (serverdata.f);
rewind (serverdata.f);
sprintf(filesize,"filesize is %d",serverdata.filesize);
__android_log_write(ANDROID_LOG_INFO, "tftp-client",filesize);
//printf("filesize=%d\n",serverdata.filesize);
//clients[k].state=1;//state change to 1
}
/*if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
{
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "Error connecting");
exit(1);
}*/
struct timeval select_timeout;
select_timeout.tv_sec=4;
select_timeout.tv_usec=0;
serverdata.fd=sockfd;
serverdata.addr = serv_addr;
serverdata.block = 1;
send_wrq();
//rc4_state_clean(&rc4state);
while(1){
nready=select(maxfd+1,&allset,NULL,NULL,NULL);//select return 0 if timeout ,otherwise return # of ready fd
if(nready==0){//timeout
char blocknum[128];
__android_log_write(ANDROID_LOG_INFO, "tftp-client", "Timeout happened");
sprintf(blocknum,"Block num last sent is %d",serverdata.block);
__android_log_write(ANDROID_LOG_INFO, "tftp-client",blocknum);
retransmit();
select_timeout.tv_sec=4;
select_timeout.tv_usec=0;
continue;
}
//if(FD_ISSET(sockfd,&allset)){
//new connection
if(n=recvfrom(sockfd, buffer, BUFFERSIZE+4, 0,(struct sockaddr *)&server_addr,(socklen_t *)&server_len)<0)
__android_log_write(ANDROID_LOG_INFO, "tftp-client","receive error");
else
{
rc4_init(&rc4state,rc4key,strlen(rc4key));
__android_log_write(ANDROID_LOG_INFO, "tftp-client","received some data");
serverdata.fd=sockfd;
serverdata.size=0;
serverdata.addr=server_addr;
serverdata.addr_len=server_len;
memset(serverdata.buffer,0,BUFFERSIZE+4);
memset(serverdata.encryptedbuffer,0,BUFFERSIZE+4);
memcpy(serverdata.encryptedbuffer,buffer,sizeof(buffer));
rc4_crypt(&rc4state,serverdata.encryptedbuffer,serverdata.buffer,sizeof(serverdata.encryptedbuffer));
//memcpy(serverdata.buffer,buffer,BUFFERSIZE+4);
//rc4_crypt(serverdata.rc4state,serverdata.encryptedbuffer,serverdata.buffer,strlen(serverdata.encryptedbuffer));
state_machine();
}
if(serverdata.last_block == 1)
break;
}
serverdata.last_block =0;
printf("last block sent\n");
/*for(i=0;i<MAX_CLIENT;++i){
if(clients[i].fd<0){
clients[i].fd=connfd;
clients[i].size=0;
clients[i].addr=cli_addr;
clients[i].addr_len=cli_len;
memcpy(clients[i].buffer,buffer,BUFFERSIZE);
state_machine(i);
clients[i].time=(int)time(NULL);
break;
}
}
if(i==MAX_CLIENT){
printf("too many clients\n");
continue;
}
FD_SET(connfd,&allset);
if(connfd>maxfd){
maxfd=connfd;
}
if(i>maxi) maxi=i;
if(--nready<=0){
continue;
}*/
//}
//old connection
/*for(i=0;i<=maxi;++i){
if((iofd=clients[i].fd)<0) continue;
if(FD_ISSET(iofd,&rset)){
printf("\n\n\n~~~~~~~~~~~~~~~~~~~~~~~~~OLD CONNECTION %d~~~~~~~~~~~~~~~~~~~~~~~\n",i);
if(n=recvfrom(iofd, buffer, BUFFERSIZE, 0, (struct sockaddr *)&cli_addr, (socklen_t *)&cli_len)<0) error("receive error");
memcpy(clients[i].buffer,buffer,BUFFERSIZE);
state_machine(i);
// client_read(i);
if(--nready<=0) break;/
break;
}
}
select_timeout.tv_sec=1;
select_timeout.tv_usec=0;
//otherwise, timeout*/
//}
}
