ssize_t dg_send_recv(int fd, const void *outbuff, size_t outbytes,
void *inbuff, size_t inbytes,
const SA *destaddr, socklen_t destlen)
{
ssize_t n;
struct iovec iovsend[2], iovrecv[2];
if (rttinit == 0) {
rtt_init(&rttinfo); /* first time we're called */
rttinit = 1;
rtt_d_flags = 1;
}
sendhdr.seq++;
msgsend.msg_name = destaddr;
msgsend.msg_namelen = destlen;
msgsend.msg_iov = iovsend;
msgsend.msg_iovlen = 2;
iovsend[0].iov_base = &sendhdr;
iovsend[0].iov_len = sizeof(struct hdr);
iovsend[1].iov_base = outbuff;
iovsend[1].iov_len = outbytes;
msgrecv.msg_name = NULL;
msgrecv.msg_namelen = 0;
msgrecv.msg_iov = iovrecv;
msgrecv.msg_iovlen = 2;
iovrecv[0].iov_base = &recvhdr;
iovrecv[0].iov_len = sizeof(struct hdr);
iovrecv[1].iov_base = inbuff;
iovrecv[1].iov_len = inbytes;
Signal(SIGALRM, sig_alrm);
rtt_newpack(&rttinfo); /* initialize for this packet */
sendagain:
sendhdr.ts = rtt_ts(&rttinfo);
Sendmsg(fd, &msgsend, 0);
alarm(rtt_start(&rttinfo)); /* calc timeout value & start timer */
if (sigsetjmp(jmpbuf, 1) != 0) {
if (rtt_timeout(&rttinfo) < 0) {
err_msg("dg_send_recv: no response from server, giving up");
rtt_init = 0; /* reinit in case we're called again */
errno = ETIMEDOUT;
return -1;
}
goto sendagain;
}
do {
n = Recvmsg(fd, &msgrecv, 0);
} while (n < sizeof(struct hdr) || recvhdr.seq != sendhdr.seq);
alarm(0); /* stop SIGALRM timer. */
/* calculate & store new RTT estimator value. */
rtt_stop(&rttinfo, rtt_ts(&rttinfo) - recvhdr.ts);
return (n - sizeof(struct hdr)); /* return size of received datagram. */
}
ssize_t
dg_send_recv(int fd, const void *outbuff, size_t outbytes,
void *inbuff, size_t inbytes,
const SA *destaddr, socklen_t destlen)
{
ssize_t n;
struct iovec iovsend[2], iovrecv[2];
if (rttinit == 0) {
rtt_init(&rttinfo); /* first time we're called */
rttinit = 1;
rtt_d_flag = 1;
}
sendhdr.seq++;
msgsend.msg_name = destaddr;
msgsend.msg_namelen = destlen;
msgsend.msg_iov = iovsend;
msgsend.msg_iovlen = 2;
iovsend[0].iov_base = &sendhdr;
iovsend[0].iov_len = sizeof(struct hdr);
iovsend[1].iov_base = outbuff;
iovsend[1].iov_len = outbytes;
msgrecv.msg_name = NULL;
msgrecv.msg_namelen = 0;
msgrecv.msg_iov = iovrecv;
msgrecv.msg_iovlen = 2;
iovrecv[0].iov_base = &recvhdr;
iovrecv[0].iov_len = sizeof(struct hdr);
iovrecv[1].iov_base = inbuff;
iovrecv[1].iov_len = inbytes;
/* end dgsendrecv1 */
/* include dgsendrecv2 */
if (signal(SIGALRM, sig_alrm) == SIG_ERR) {
perror("signal error");
exit(1);
}
rtt_newpack(&rttinfo); /* initialize for this packet */
sendagain:
#ifdef RTT_DEBUG
fprintf(stderr, "send %4d: ", sendhdr.seq);
#endif
sendhdr.ts = rtt_ts(&rttinfo);
int nbytes = 0; /* must first figure out what return value should be */
int i;
for (i = 0; i < msgsend.msg_iovlen; i++)
nbytes += msgsend.msg_iov[i].iov_len;
if (sendmsg(fd, &msgsend, 0) != nbytes) {
perror("sendmsg error");
exit(1);
}
alarm(rtt_start(&rttinfo)); /* calc timeout value & start timer */
#ifdef RTT_DEBUG
rtt_debug(&rttinfo);
#endif
if (sigsetjmp(jmpbuf, 1) != 0) {
if (rtt_timeout(&rttinfo) < 0) {
fprintf(stderr, "dg_send_recv: no response from server, giving up\n");
rttinit = 0; /* reinit in case we're called again */
errno = ETIMEDOUT;
return(-1);
}
#ifdef RTT_DEBUG
fprintf(stderr, "dg_send_recv: timeout, retransmitting\n");
#endif
goto sendagain;
}
do {
if ((n = recvmsg(fd, &msgrecv, 0)) < 0) {
perror("recvmsg error");
exit(1);
}
#ifdef RTT_DEBUG
fprintf(stderr, "recv %4d\n", recvhdr.seq);
#endif
} while (n < sizeof(struct hdr) || recvhdr.seq != sendhdr.seq);
alarm(0); /* stop SIGALRM timer */
/* 4calculate & store new RTT estimator values */
rtt_stop(&rttinfo, rtt_ts(&rttinfo) - recvhdr.ts);
return(n - sizeof(struct hdr)); /* return size of received datagram */
}
/* RETURNS ACK_NO */
int dg_recieve_ack( int fd )
{
ssize_t n;
struct iovec iovrecv[2];
char IPClient[20];
memset( &msgrecv, '\0', sizeof(msgrecv) );
memset( &recvhdr, '\0', sizeof(recvhdr) );
msgrecv.msg_name = NULL;
msgrecv.msg_namelen = 0;
msgrecv.msg_iov = iovrecv;
msgrecv.msg_iovlen = 2;
iovrecv[0].iov_base = &recvhdr;
iovrecv[0].iov_len = sizeof(struct hdr);
if( n = Recvmsg( fd, &msgrecv, 0) < 0 )
{
printf("Error in RecvMsg!!\n");
printf("Error no : %d\n", errno );
exit(0);
}
if( recvhdr.ack_no == -3 )
{
printf("Recieved a FIN-ACK from client..\n");
// struct itimerval value, ovalue, pvalue;
// value.it_interval.tv_sec = 0; /* Zero seconds */
// value.it_interval.tv_usec = 0; /* Two hundred milliseconds */
// value.it_value.tv_sec = 0; /* Zero seconds */
// value.it_value.tv_usec = 0; /* Five hundred milliseconds */
// setitimer( ITIMER_REAL, &value, &ovalue );
return -3;
}
/* If we recieved the right packet ACKNOWLEDGEMENT, that is one which na was pointing to, we calculate RTT */
if( na == (recvhdr.ack_no - 1) )
{
rtt_stop(&rttinfo,
rtt_ts(&rttinfo) - recvhdr.ts);
rtt_newpack( &rttinfo );
printf("Recieved an ACK-%d from client..\n", recvhdr.ack_no );
}
printf( "Updating the reciever advertisement global variable with %d..\n", recvhdr.recv_window_advertisement );
recv_advertisement = recvhdr.recv_window_advertisement;
update_na( recvhdr.ack_no );
current_ack = recvhdr.ack_no;
if( prev_ack == current_ack )
{
/* We got 3 DUP's */
dup_ack++;
}
else
{
dup_ack = 0;
}
/* swap fpr next ACK */
prev_ack = current_ack;
return recvhdr.ack_no;
}
static int su_serv_send_recv_act(su_serv_t *psvr, SA *destaddr, socklen_t destlen,
const void *outbuff, int outbytes, void *inbuff, int inbytes, int retransmit)
{
int n;
struct iovec iovsend[2]= {{0}};
struct msghdr msgsend = {0}; /* assumed init to 0 */
suhdr_t *r, sendhdr = {0}; /* protocol header */
int ret, waitsec;
struct list *node = 0;
frames_t *packet = 0;
pthread_mutex_lock(&psvr->mutex);
pthread_mutex_lock(&psvr->lock);
if (retransmit == 0) {
psvr->seq++;
psvr->retransmission = 1;
} else {
if (psvr->retransmission == 0) {
pthread_mutex_unlock(&psvr->mutex);
pthread_mutex_unlock(&psvr->lock);
errno = ETIMEDOUT;
return -1;
}
psvr->retransmission --;
}
if (psvr->rttinit == 0) {
rtt_init(&psvr->rttinfo, psvr->retry); /* first time we're called */
psvr->rttinit = 1;
}
sendhdr.act = SU_SYN;
sendhdr.type = SU_RELIABLE;
sendhdr.sid = psvr->sid;
sendhdr.seq = psvr->seq;
msgsend.msg_name = (void*)destaddr;
msgsend.msg_namelen = destlen;
msgsend.msg_iov = iovsend;
msgsend.msg_iovlen = 2;
iovsend[0].iov_base = (void*)&sendhdr;
iovsend[0].iov_len = sizeof(suhdr_t);
iovsend[1].iov_base = (void*)outbuff;
iovsend[1].iov_len = outbytes;
struct timespec abstime = {0};
suhdr_t *precvhdr;
rtt_newpack(&psvr->rttinfo); /* initialize for this packet */
psvr->ackwaitnum ++;
sendagain:
sendhdr.ts = rtt_ts(&psvr->rttinfo);
if (sendmsg(psvr->fd, &msgsend, 0) < 0) {
ERR_RET("sendmsg error");
goto error_ret;
}
waitsec = rtt_start(&psvr->rttinfo); /* calc timeout value & start timer */
#ifdef SU_DEBUG_RTT
fprintf(stderr, ColorRed "send seq %4d: " ColorEnd, sendhdr.seq);
rtt_debug(&psvr->rttinfo);
#endif
/* set timed wait time-point */
maketimeout_seconds(&abstime, waitsec);
#ifdef SU_DEBUG_TIMEVERBOSE
struct timeval now;
gettimeofday(&now, 0);
log_msg( ColorBlue "pthread_cond_timedwait : %u.%u time expire" ColorEnd,
abstime.tv_sec, abstime.tv_nsec);
log_msg( ColorBlue "pthread_cond_timedwait : %d.%d now time" ColorEnd,
now.tv_sec, now.tv_usec*1000);
#endif
timedwaitagain:
ret = pthread_cond_timedwait(&psvr->ackcond, &psvr->lock, &abstime);
if (ret == 0) {
#ifdef SU_DEBUG_TIMEVERBOSE
struct timeval now;
gettimeofday(&now, 0);
log_msg(ColorBlue "pthread_cond_timedwait : %d.%d ack cond interrupt" ColorEnd,
now.tv_sec, now.tv_usec*1000);
#endif
node = psvr->ackrecvls.next;
for (; node != &psvr->ackrecvls; node = node->next) {
packet = container_of(node, frames_t, node);
r = &packet->recvhdr;
if (su_cmp_ack_SU_RELIABLE(&sendhdr, r)) {
break;
}
}
if ( node == &psvr->ackrecvls ) {
/* Be careful of the lock, locked -> timedwait -> unlock */
#ifdef SU_DEBUG_LIST
log_msg("serv %x no found seq %d ack, timed wait again", psvr, sendhdr.seq);
#endif
goto timedwaitagain;
}
/* Find response packet node */
list_remove(&packet->node);
n = packet->len;
precvhdr = &packet->recvhdr;
#if defined SU_DEBUG_PEER_RECV || defined SU_DEBUG_LIST
log_msg("serv %x finded ack " ColorRed "%p" ColorEnd " seq %d datagram len %d",
psvr, packet, r->seq, packet->len);
#endif
#ifdef SU_DEBUG_RTT
fprintf(stderr, ColorRed "recv seq %4d \n" ColorEnd, precvhdr->seq);
#endif
// SU_RELIABLE received response, copy to user buffer
memcpy(inbuff, packet->data, n > inbytes ? inbytes : n);
} else if (ret == EINTR) {
log_msg("pthread_cond_timedwait system EINTR");
goto timedwaitagain;
} else if (ret == ETIMEDOUT) {
#ifdef SU_DEBUG_TIMEVERBOSE
struct timeval now;
gettimeofday(&now, 0);
log_msg(ColorBlue "pthread_cond_timedwait : %u.%u ETIMEOUT have expired" ColorEnd,
now.tv_sec, now.tv_usec*1000);
#endif
if (rtt_timeout(&psvr->rttinfo) < 0) {
#ifdef SU_DEBUG_RTT
err_msg(ColorYel "no response from server, giving up" ColorEnd);
#endif
psvr->rttinit = 0; /* reinit in case we're called again */
errno = ETIMEDOUT;
goto error_ret;
}
#ifdef SU_DEBUG_RTT
err_msg(ColorRed " seq %4d timeout, retransmitting %d" ColorEnd,
sendhdr.seq, ++retransmit);
#endif
goto sendagain;
} else {
errno = ret;
ERR_RET(" su_serv_send_recv_act unknown error[%d]", ret);
goto error_ret;
}
/* calculate & store new RTT estimator values */
rtt_stop(&psvr->rttinfo, rtt_ts(&psvr->rttinfo) - precvhdr->ts);
if (--psvr->ackwaitnum == 0) {
su_serv_list_empty(psvr, &psvr->ackrecvls);
}
pthread_mutex_unlock(&psvr->mutex);
pthread_mutex_unlock(&psvr->lock);
#ifdef SU_DEBUG_LIST
log_msg("serv %x free node " ColorRed "%p"ColorEnd" seq %d", psvr, packet, sendhdr.seq);
#endif
free(packet);
return(n); /* return size of received datagram */
error_ret:
if (--psvr->ackwaitnum == 0) {
su_serv_list_empty(psvr, &psvr->ackrecvls);
}
pthread_mutex_unlock(&psvr->mutex);
pthread_mutex_unlock(&psvr->lock);
return(-1);
}
int sendFileContents(int sockfd,int totalblocks, int windowsize){
//printf("%d\n", totalblocks);
int first_unacknowledged_pos = 0;
int pos_sent = -1;
int prev_ack = 0;
struct dgram recv_packet;
int dups = 0;
int recv_ack = -1;
int retransmit = 0;
int rtt_measured_packet = 0;
uint32_t ts;
int starttimer = 1;
int hasBeenRtransmitted = 0;
int slow_start = 1;
Signal(SIGALRM, sig_alrm);
if (rttinit == 0) {
rtt_init(&rttinfo); /* first time we're called */
rttinit = 1;
rtt_d_flag = 1;
}
while(1){
retransmitpack:
if(retransmit){
printf("RETRANSMIT PACKET: %d\n", first_unacknowledged_pos);
hasBeenRtransmitted = 1;
slow_start = 1;
Sendto(sockfd, (void *)&fileContent[first_unacknowledged_pos], sizeof(struct dgram), 0, NULL, NULL);
retransmit = 0;
}
if (sigsetjmp(jmpbuf, 1) != 0) {
//rtt_debug(&rttinfo);
if (rtt_timeout(&rttinfo) < 0) {
err_msg("no response from client, giving up");
rttinit = 0;
errno = ETIMEDOUT;
return(-1);
}
retransmit = 1;
goto retransmitpack;
}
int sent_packets = 0;
while( (0 < slow_start) && (pos_sent < totalblocks-1) && (pos_sent + 1 < first_unacknowledged_pos + windowsize)){
if(starttimer){
rtt_newpack(&rttinfo);
alarm(rtt_start(&rttinfo));
ts = rtt_ts(&rttinfo);
starttimer = 0;
rtt_measured_packet = fileContent[pos_sent+1].seqNum;
hasBeenRtransmitted = 0;
}
Sendto(sockfd, (void *)&fileContent[pos_sent+1], sizeof(struct dgram), 0, NULL, NULL);
printf("SEND PACKET: %d\n", pos_sent+1);
pos_sent++;
slow_start--;
}
if(Recvfrom(sockfd, &recv_packet, sizeof(struct dgram), 0, NULL, NULL) < 0){
err_msg("Receive error from client");
return -1;
}
else{
//rtt_debug(&rttinfo);
windowsize = recv_packet.windowsize;
if(recv_packet.ack == recv_ack){
dups++;
}
else {
dups = 0;
}
recv_ack = recv_packet.ack;
printf("RECEIVED ACK: %d\n", recv_ack);
if(dups == 0){
alarm(0);
if(!hasBeenRtransmitted && recv_ack > rtt_measured_packet)
rtt_stop(&rttinfo, rtt_ts(&rttinfo) - ts);
starttimer = 1;
slow_start += 2*(recv_ack - prev_ack);
}
prev_ack = recv_ack;
first_unacknowledged_pos = recv_packet.ack;
retransmit = 0;
if(dups >= MAXDUPS){
// retransmit first unack pos
retransmit = 1;
goto retransmitpack;
}
}
if( first_unacknowledged_pos > 0 && fileContent[first_unacknowledged_pos-1].eof){
printf("SUCCESS: SENT ENTIRE FILE\n");
break;
}
}
return totalblocks;
}
ssize_t
dg_send_recv(int fd, const void *outbuff, size_t outbytes,
void *inbuff, size_t inbytes,
const SA *destaddr, socklen_t destlen)
{
ssize_t n;
struct iovec iovsend[2], iovrecv[2];
fd_set rset;
int nsel, maxfdp1;
struct timeval tv;
if (rttinit == 0) {
rtt_init(&rttinfo); /* first time we're called */
rttinit = 1;
rtt_d_flag = 1;
}
sendhdr.seq++;
msgsend.msg_name = destaddr;
msgsend.msg_namelen = destlen;
msgsend.msg_iov = iovsend;
msgsend.msg_iovlen = 2;
iovsend[0].iov_base = &sendhdr;
iovsend[0].iov_len = sizeof(struct hdr);
iovsend[1].iov_base = outbuff;
iovsend[1].iov_len = outbytes;
msgrecv.msg_name = NULL;
msgrecv.msg_namelen = 0;
msgrecv.msg_iov = iovrecv;
msgrecv.msg_iovlen = 2;
iovrecv[0].iov_base = &recvhdr;
iovrecv[0].iov_len = sizeof(struct hdr);
iovrecv[1].iov_base = inbuff;
iovrecv[1].iov_len = inbytes;
rtt_newpack(&rttinfo); /* initialize for this packet */
sendagain:
#ifdef RTT_DEBUG
fprintf(stderr, "send %4d: ", sendhdr.seq);
#endif
sendhdr.ts = rtt_ts(&rttinfo);
Sendmsg(fd, &msgsend, 0);
alarm(rtt_start(&rttinfo)); /* calc timeout value & start timer */
#ifdef RTT_DEBUG
rtt_debug(&rttinfo);
#endif
tv.tv_sec = rtt_start(&rttinfo);
tv.tv_usec = 0;
maxfdp1 = fd + 1;
again:
FD_ZERO(&rset);
FD_SET(fd, &rset);
nsel = select(maxfdp1, &rset, NULL, NULL, &tv);
if ((nsel == -1) || (errno == EINTR))
goto again;
else if (nsel == -1)
err_msg("select error");
else if (nsel == 0) {
if (rtt_timeout(&rttinfo) < 0) {
err_msg("dg_send_recv: no response from server, giving up");
rttinit = 0; /* reinit in case we're called again */
errno = ETIMEDOUT;
return(-1);
}
#ifdef RTT_DEBUG
err_msg("dg_send_recv: timeout, retransmitting");
#endif
goto sendagain;
}
if (FD_ISSET(fd, &rset)) {
do {
n = Recvmsg(fd, &msgrecv, 0);
#ifdef RTT_DEBUG
fprintf(stderr, "recv %4d\n", recvhdr.seq);
#endif
} while (n < sizeof(struct hdr) || recvhdr.seq != sendhdr.seq);
}
/* 4calculate & store new RTT estimator values */
rtt_stop(&rttinfo, rtt_ts(&rttinfo) - recvhdr.ts);
return(n - sizeof(struct hdr)); /* return size of received datagram */
}
void child(int index, struct sockaddr_in* ptr_connaddr, struct datagram* ptr_conn_gram) {
struct datagram recv_gram;
struct datagram send_gram;
struct datagram* sendbuf;
uint32_t* sendtv;
char *tmp;
int sockfd;
int nready;
int i;
fd_set rset, allset;
int maxfdp1 = 0;
struct sockaddr_in servaddr, cliaddr;
int local = 0;
int on = 1;
int len;
//int filepos = -1;
int filesize = 0;
int servsockclosed = 0;
int recv_seq;
int last_ack;
int last_ack_times;
int recv_ack;
int send_seq;
int send_flag;
int seq = 2568;
int newport = 0;
int recv_lock = 0;
int eof = 0;
int send_exist = 0;
int buf_to_send = 0;
int ssth = 0;
float congestion_size = 1;
int max_size = 0;
uint32_t ts;
FILE* file;
char* payload;
char* filename;
struct rtt_info rttinfo;
rtt_init(&rttinfo);
for (i=0;i<count;i++) {
if (i != index) {
Close(sockfds[i]);
continue;
}
}
// todo: file not exist
// todo: pipeline
payload = get_payload_ptr(ptr_conn_gram);
recv_windowsize = *(int*)payload;
filename = payload+sizeof(int);
printf("Client [%s:%d] request %s\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port), filename);
file = fopen(filename, "r");
if (!file) {
printf("File not exist: %s\n", filename);
Close(sockfd);
return;
}
fseek(file, 0, SEEK_END);
filesize = ftell(file);
fseek(file, 0, SEEK_SET);
local = is_local(addrs[index], ptr_connaddr, 0);
sockfd = Socket(AF_INET, SOCK_DGRAM, 0);
Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = ((struct sockaddr_in*)addrs[index]->ifi_addr)->sin_addr.s_addr;
servaddr.sin_port = 0;
Bind(sockfd, (SA *) &servaddr, sizeof(servaddr));
len = sizeof(servaddr);
getsockname(sockfd, (SA *) &servaddr, &len);
if (local == 0) {
printf("Client [%s:%d] is not LOCAL\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port));
} else if (local == 1) {
printf("Client [%s:%d] is LOCAL\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port));
} else if (local == 2) {
printf("Client [%s:%d] is LOOPBACK\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port));
}
if (local)
Setsockopt(sockfd, SOL_SOCKET, SO_DONTROUTE, &on, sizeof(on));
//Connect(sockfd, (SA*)ptr_connaddr, sizeof(struct sockaddr_in));
// init
// todo: fail
sendbuf = (struct datagram*)malloc(windowsize*sizeof(struct datagram));
memset(sendbuf, 0, windowsize*sizeof(struct datagram));
sendtv = (uint32_t*)malloc(windowsize*sizeof(uint32_t));
memset(sendtv, 0, windowsize*sizeof(uint32_t));
send_exist = 0;
last_ack = 0;
last_ack_times = 0;
newport = (int)ntohs(servaddr.sin_port);
printf("New port for client [%s:%d] is %d\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port), newport);
get_header(ptr_conn_gram, 0, &recv_seq, 0, &ts);
make_datagram(&sendbuf[0], SYN | ACK, seq, recv_seq+1, ts, (char*)&newport, sizeof(newport));
sendtv[0] = rtt_ts(&rttinfo) + rtt_start(&rttinfo);
send_to(sockfd, &sendbuf[0], ptr_connaddr, sizeof(struct sockaddr_in));
send_exist++;
FD_ZERO(&allset);
FD_ZERO(&rset);
FD_SET(sockfd, &allset);
maxfdp1 = sockfd+1;
for(;;) {
rset = allset;
// handle timeout
// todo: rtt, recv_lock
ts = rtt_start(&rttinfo);
struct timeval tv;
tv.tv_sec = ts/1000;
tv.tv_usec = (ts % 1000)*1000;
nready = select(maxfdp1, &rset, NULL, NULL, &tv);
if (nready < 0) {
if (errno == EINTR)
continue; /* back to for() */
else
err_sys("select error");
} else if (nready == 0) {
// timeout
if (recv_lock) {
ts = rtt_ts(&rttinfo);
make_datagram(&send_gram, ACK, 0, 0, ts, NULL, 0);
send_to(sockfd, &send_gram, ptr_connaddr, sizeof(*ptr_connaddr));
continue;
}
// resend
for (i=0;i<windowsize;i++) {
if (0 == sendtv[i])
continue;
ts = rtt_ts(&rttinfo);
if (ts >= sendtv[i]) {
set_ts(&sendbuf[i], ts);
send_to(sockfd, &sendbuf[i], ptr_connaddr, sizeof(*ptr_connaddr));
sendtv[i] = ts + rtt_start(&rttinfo);
}
}
if (rtt_timeout(&rttinfo) < 0) {
if (!servsockclosed) {
Close(sockfds[index]);
servsockclosed = 1;
}
Close(sockfd);
fclose(file);
printf("Too many timeouts for Client [%s:%d]\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port));
return;
}
ssth = (int)congestion_size/2;
if (ssth < 1)
ssth = 1;
congestion_size = 1;
printf("Timeout slow start\n");
continue;
}
if (FD_ISSET(sockfd, &rset)) {
len = sizeof(cliaddr);
recv_from(sockfd, &recv_gram, &cliaddr, &len);
get_header(&recv_gram, 0, 0, &recv_ack, &ts);
rtt_stop(&rttinfo, rtt_ts(&rttinfo)-ts);
payload = get_payload_ptr(&recv_gram);
recv_lock = (*(int*)payload == 0)?1:0;
if (!servsockclosed) {
Close(sockfds[index]);
servsockclosed = 1;
}
for (i=0;i<windowsize;i++) {
get_header(&sendbuf[i], &send_flag, &send_seq, 0, 0);
if (!send_flag)
continue;
if (send_seq < recv_ack) {
set_flag(&sendbuf[i], 0);
sendtv[i] = 0;
send_exist--;
}
}
if ((recv_ack > seq) && eof) {
Close(sockfd);
fclose(file);
printf("Client [%s:%d] end\n", inet_ntoa(ptr_connaddr->sin_addr), ntohs(ptr_connaddr->sin_port));
return;
}
if (last_ack == recv_ack) {
last_ack_times++;
} else {
last_ack = recv_ack;
last_ack_times=1;
}
if (last_ack_times >= 3) {
last_ack = 0;
for (i=0;i<windowsize;i++) {
get_header(&sendbuf[i], &send_flag, &send_seq, 0, 0);
if (!send_flag)
continue;
if (send_seq == recv_ack)
break;
}
ts = rtt_ts(&rttinfo);
set_ts(&sendbuf[i], ts);
send_to(sockfd, &sendbuf[i], ptr_connaddr, sizeof(*ptr_connaddr));
// todo: congestion
printf("Fast recvory\n");
congestion_size = ssth;
if (congestion_size <= 0)
congestion_size = 1;
continue;
}
// todo: congestion
max_size = windowsize;
if (recv_windowsize < max_size)
max_size = recv_windowsize;
if (congestion_size < ssth) {
congestion_size++;
if (congestion_size >= ssth) {
printf("Reach slow start threshold\n");
}
} else {
congestion_size += (max_size > 0)? 1.0/max_size:1.0;
}
if (congestion_size < max_size)
max_size = (int)congestion_size;
if (eof || recv_lock) {
buf_to_send = 0;
} else if (send_exist < max_size) {
buf_to_send = max_size - send_exist;
} else if (send_exist >= max_size) {
buf_to_send = 0;
}
//printf("buf_to_send %d\n", buf_to_send);
for (;buf_to_send > 0;buf_to_send--) {
for (i=0;i<windowsize;i++) {
get_header(&sendbuf[i], &send_flag, &send_seq, 0, 0);
if (!send_flag)
break;
}
seq++;
ts = rtt_ts(&rttinfo);
make_datagram(&sendbuf[i], DAT, seq, 0, ts, NULL, 0);
payload = get_payload_ptr(&sendbuf[i]);
//len = fread(payload+4, BUFFER_SIZE-HEADER_SIZE-4, 1, file);
len = fread(payload+4, 1, BUFFER_SIZE-HEADER_SIZE-4, file);
*(int*)payload = len;
//printf("f %d %s\n", len, payload+4);
if (ftell(file) >= filesize) {
eof = 1;
set_fin_flag(&sendbuf[i]);
}
sendtv[i] = ts + rtt_start(&rttinfo);
send_to(sockfd, &sendbuf[i], ptr_connaddr, sizeof(*ptr_connaddr));
send_exist++;
if (eof)
break;
}
}
}
}
ssize_t jxclient_sendrecv(struct jxclient* cli, const struct sockaddr* servaddr, jxsocklen_t addrlen, mflag_t mflag)
{
char outbuf[MAX_MSG_LEN];
ssize_t recvbytes;
jxsocklen_t sendlen;
struct jxmsg_header* bufheader = NULL;
if (s_rttinit == 0) {
rtt_init(&s_rttinfo);
s_rttinit = 1;
#ifdef _DEBUG
rtt_d_flag = 1;
#endif
}
if (s_mutex_inited == 0) {
s_sendrecv_init();
}
bufheader = (struct jxmsg_header*)outbuf;
bufheader->mflag = mflag;
bufheader->header.seq = ++s_sendhdr.seq;
rtt_newpack(&s_rttinfo);
sendlen = sizeof(bufheader->addr);
jxsock_getsockname(cli->hsock_sendrecv, &bufheader->addr, &sendlen);
bufheader->addrlen = (uint8_t)sendlen;
bufheader->numbytes = htonl(cli->len_senddata);
if (jxmemcpy(
outbuf + sizeof(struct jxmsg_header),
sizeof(outbuf) - sizeof(struct jxmsg_header),
cli->sendbuf, cli->len_senddata) != 0) {
return 1;
}
s_recv_stat = RECV_RESEND;
while (RECV_RESEND == s_recv_stat) {
bufheader->header.ts = s_sendhdr.ts = rtt_ts(&s_rttinfo);
if (SOCKET_ERROR == sendto(
cli->hsock_sendrecv,
outbuf,
sizeof(struct jxmsg_header) + cli->len_senddata,
0,
servaddr,
(jxsocklen_t)addrlen)) {
fprintf(stderr, "%s sendto() fail, error code: %d.\n", cli->prompt, jxsock_get_last_error());
return -2;
}
if (!JX_MFLAG_WAIT_RECV(mflag)) {
return 0;
}
s_reset_recvtimer();
if ((recvbytes = s_recvmsg(cli->hsock_sendrecv, cli->recvbuf, sizeof(cli->recvbuf))) == -3) {
return -3;
}
}
if (s_recv_stat == RECV_TIMEOUT) {
s_rttinit = 0;
return -1;
}
rtt_stop(&s_rttinfo, rtt_ts(&s_rttinfo) - ((struct jxmsg_header*)cli->recvbuf)->header.ts);
jxmsg_copyaddr((struct jxmsg_header*)cli->recvbuf, servaddr, addrlen);
return recvbytes - sizeof(struct jxmsg_header);
}
