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server_phase.c
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server_phase.c
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/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. bush@tcnj.edu
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the copyright holder
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <math.h>
#ifdef WINDOWS
#include <io.h>
#include "win_func.h"
#else // if WINDOWS
#include <sys/time.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include "server.h"
#include "server_config.h"
#include "server_common.h"
#include "server_announce.h"
#include "server_transfer.h"
/**
* Check an announce phase message and pass to appropriate message handler,
* decrypting first if necessary
* Returns 1 on success, 0 on error
*/
int handle_announce_phase(unsigned char *packet, unsigned char *decrypted,
int packetlen, const union sockaddr_u *receiver,
struct finfo_t *finfo,
int announce, int open_group, int regconf)
{
struct uftp_h *header;
unsigned char *message;
int hostidx;
unsigned decryptlen, meslen;
uint8_t *func;
header = (struct uftp_h *)packet;
hostidx = find_client(header->src_id);
if ((keytype != KEY_NONE) && (header->func == ENCRYPTED)) {
if (hostidx == -1) {
glog2(finfo, "Got encrypted packet from unknown receiver %08X",
ntohl(header->src_id));
return 0;
}
if (!validate_and_decrypt(packet, packetlen, &decrypted, &decryptlen,
keytype, groupkey, groupsalt, ivlen, hashtype, grouphmackey,
hmaclen, sigtype, keyextype, destlist[hostidx].encinfo->pubkey,
destlist[hostidx].encinfo->pubkeylen)) {
glog1(finfo, "Rejecting message from %s: decrypt/validate failed",
destlist[hostidx].name);
return 0;
}
func = (uint8_t *)decrypted;
message = decrypted;
meslen = decryptlen;
} else {
if ((keytype != KEY_NONE) && ((header->func == KEYINFO_ACK) ||
(header->func == FILEINFO_ACK))) {
glog1(finfo, "Rejecting %s message from %08X: not encrypted",
func_name(header->func), ntohl(header->src_id));
return 0;
}
func = (uint8_t *)&header->func;
message = packet + sizeof(struct uftp_h);
meslen = packetlen - sizeof(struct uftp_h);
}
if (*func == ABORT) {
handle_abort(message, meslen, hostidx, finfo, header->src_id);
return 1;
}
if (hostidx == -1) {
if (open_group) {
if (*func == REGISTER) {
handle_open_register(message, meslen, finfo, receiver,
header->src_id, regconf);
} else if (*func == CLIENT_KEY) {
handle_open_clientkey(message, meslen, finfo, receiver,
header->src_id);
} else {
glog1(finfo, "Invalid function: expected "
"REGISTER or CLIENT_KEY, got %s",func_name(*func));
}
} else {
glog1(finfo, "Host %08X not in host list", ntohl(header->src_id));
send_abort(finfo, "Not in host list", receiver, header->src_id,0,0);
}
} else {
switch (destlist[hostidx].status) {
case DEST_MUTE:
if (*func == REGISTER) {
handle_register(message, meslen, finfo, receiver,
hostidx, regconf, open_group);
} else if (*func == CLIENT_KEY) {
handle_clientkey(message, meslen, finfo, receiver, hostidx);
} else {
glog1(finfo, "Invalid function: expected "
"REGISTER or CLIENT_KEY, got %s",func_name(*func));
}
break;
case DEST_REGISTERED:
if (announce && (*func == KEYINFO_ACK)) {
handle_keyinfo_ack(message, meslen, finfo, receiver, hostidx);
} else if (!announce && (*func == FILEINFO_ACK)) {
handle_fileinfo_ack(message, meslen, finfo, hostidx);
} else if (*func == REGISTER) {
handle_register(message, meslen, finfo, receiver,
hostidx, regconf, open_group);
} else if (*func == CLIENT_KEY) {
glog2(finfo, "Received CLIENT_KEY+ from %s",
destlist[hostidx].name);
} else if (!announce && (*func == COMPLETE)) {
handle_complete(message, meslen, finfo, hostidx);
} else {
glog1(finfo, "Received invalid message %s from %s",
func_name(*func), destlist[hostidx].name);
}
break;
case DEST_ACTIVE:
if (*func == REGISTER) {
handle_register(message, meslen, finfo, receiver,
hostidx, regconf, open_group);
} else if (*func == CLIENT_KEY) {
glog2(finfo, "Received CLIENT_KEY+ from %s",
destlist[hostidx].name);
} else if (announce && (*func == KEYINFO_ACK)) {
finfo->deststate[hostidx].conf_sent = 0;
handle_keyinfo_ack(message, meslen, finfo, receiver, hostidx);
} else if (!announce && (*func == FILEINFO_ACK)) {
handle_fileinfo_ack(message, meslen, finfo, hostidx);
} else if (!announce && (*func == COMPLETE)) {
handle_complete(message, meslen, finfo, hostidx);
} else {
glog1(finfo, "Received invalid message %s from %s",
func_name(*func), destlist[hostidx].name);
}
break;
default:
glog1(finfo, "Received invalid message %s from %s",
func_name(*func), destlist[hostidx].name);
break;
}
}
return 1;
}
/**
* Perform the Announce/Register phase for a particular group/file
* Group & encryption: ->ANNOUNCE <-REGISTER ->KEYINFO <-KEYINFO_ACK
* Group & no encryption: ->ANNOUNCE <-REGISTER ->REG_CONF
* Files within a group: ->FILEINFO <-FILEINFO_ACK
* If client_key == 1, REGISTER is followed by CLIENT_KEY
* Returns ERR_NONE if at least one client responsed,
* or either ERR_ANNOUNCE or ERR_FILEINFO if none responded
*/
int announce_phase(struct finfo_t *finfo)
{
int attempt, resend, announce, regconf, keyinfo, fileinfo;
int open_group, anyerror;
int len, rval, rcv_status, last_pass, gotall, gotone, allreg, regdone, i;
unsigned char *packet, *decrypted;
struct timeval timeout, next_send, now;
union sockaddr_u receiver;
int grtt_set;
uint8_t tos;
if (finfo->file_id) {
glog2(finfo, "File ID: %04X Name: %s", finfo->file_id,finfo->filename);
glog2(finfo, " sending as: %s", finfo->destfname);
switch (finfo->ftype) {
case FTYPE_REG:
glog2(finfo, "Bytes: %s Blocks: %d Sections: %d",
printll(finfo->size), finfo->blocks, finfo->sections);
glog3(finfo, "small section size: %d, "
"big section size: %d, " "# big sections: %d",
finfo->secsize_small, finfo->secsize_big, finfo->big_sections);
break;
case FTYPE_DIR:
glog2(finfo, "Empty directory");
break;
case FTYPE_LINK:
glog2(finfo, "Symbolic link to %s", finfo->linkname);
break;
case FTYPE_DELETE:
glog2(finfo, "Delete file/directory with this name");
break;
case FTYPE_FREESPACE:
glog2(finfo, "Free disk space query");
break;
}
} else {
glog2(finfo, "Initializing group");
}
rval = ERR_NONE;
packet = safe_calloc(MAXMTU, 1);
decrypted = safe_calloc(MAXMTU, 1);
announce = (finfo->file_id == 0);
regconf = (announce && (keytype == KEY_NONE));
keyinfo = (announce && (keytype != KEY_NONE));
fileinfo = (finfo->file_id != 0);
open_group = (destcount == 0);
for (i = 0; i < destcount; i++) {
// At start of group, initialize all clients/proxies to DEST_MUTE.
// At start of file, initialize proxies to DEST_ACTIVE (since they
// don't respond directly to a FILEINFO) and clients to DEST_REGISTERED.
if (announce) {
destlist[i].status = DEST_MUTE;
} else if (!client_error(i)) {
if (destlist[i].isproxy) {
destlist[i].status = DEST_ACTIVE;
} else {
destlist[i].status = DEST_REGISTERED;
}
destlist[i].freespace = -1;
}
}
gettimeofday(&next_send, NULL);
add_timeval_d(&next_send, 3 * grtt);
resend = 1;
attempt = 1;
last_pass = 0;
regdone = 0;
grtt_set = !announce;
while (attempt <= robust) {
if (user_abort) break;
// On the initial pass, or when the timeout trips,
// send any necessary messages.
if (resend) {
if (keyinfo && !send_keyinfo(finfo, attempt)) {
continue;
}
if (announce && !send_regconf(finfo, attempt, regconf)) {
continue;
}
if (fileinfo && !send_fileinfo(finfo, attempt)) {
continue;
}
if (announce && !send_announce(finfo, attempt, open_group)) {
continue;
}
resend = 0;
}
gettimeofday(&now, NULL);
if (cmptimestamp(now, next_send) >= 0) {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
} else {
timeout = diff_timeval(next_send, now);
}
if ((rcv_status = read_packet(sock, &receiver, packet, &len,
MAXMTU, &timeout, &tos)) == -1) {
continue;
} else if (rcv_status == 0) {
attempt++;
grtt_set |= recalculate_grtt(finfo, grtt_set, 0);
gettimeofday(&next_send, NULL);
add_timeval_d(&next_send, 3 * grtt);
resend = 1;
if (last_pass) break;
continue;
}
if (!validate_packet(packet, len, finfo)) {
continue;
}
if (!handle_announce_phase(packet, decrypted, len, &receiver, finfo,
announce, open_group, regconf)) {
continue;
}
if (!open_group) {
for (i = 0, gotall = 1, allreg = 1;
(i < destcount) && (gotall || allreg); i++) {
if (announce) {
gotall = gotall && ((destlist[i].status == DEST_ACTIVE) ||
(destlist[i].status == DEST_ABORT));
allreg = allreg && ((destlist[i].status == DEST_ACTIVE) ||
(destlist[i].status == DEST_REGISTERED) ||
(destlist[i].status == DEST_ABORT));
} else {
gotall = gotall && ((destlist[i].status == DEST_ACTIVE) ||
(destlist[i].status == DEST_DONE) ||
(client_error(i)));
}
}
if (gotall) {
// Break out right away if this is a file registration.
// For group registration, do one last wait, even if
// encryption is enabled since we can still send a
// REG_CONF for a client behind a proxy.
// Change the timeout to 1 * grtt
// to allow for late registers.
if (finfo->file_id != 0) break;
recalculate_grtt(finfo, grtt_set, 0);
gettimeofday(&next_send, NULL);
add_timeval_d(&next_send, grtt);
if (!last_pass) {
glog2(finfo, "Late registers:");
}
last_pass = 1;
send_regconf(finfo, attempt + 1, regconf);
} else if (announce && allreg && !regdone) {
// All have registered, so don't wait to send the next message
resend = 1;
regdone = 1;
}
}
}
recalculate_grtt(finfo, 1, 1);
for (i = 0, gotone = 0, anyerror = 0; i < destcount; i++) {
gotone = gotone || (((destlist[i].status == DEST_ACTIVE) ||
(destlist[i].status == DEST_DONE)) &&
(!destlist[i].isproxy));
if (destlist[i].status == DEST_REGISTERED) {
if (announce) {
glog1(finfo, "Couldn't get KEYINFO_ACK from %s",
destlist[i].name);
} else {
glog1(finfo, "Couldn't get FILEINFO_ACK from %s",
destlist[i].name);
}
destlist[i].status = DEST_LOST;
anyerror = 1;
}
if ((destlist[i].status == DEST_MUTE) ||
(destlist[i].status == DEST_ABORT)) {
anyerror = 1;
}
}
if (anyerror && quit_on_error) {
glog0(finfo, "Aboring all clients");
send_abort(finfo, "A client dropped out, aborting all",
&receive_dest, 0, (keytype != KEY_NONE), 0);
for (i = 0; i < destcount; i++) {
if (destlist[i].status == DEST_ACTIVE) {
destlist[i].status = DEST_ABORT;
}
}
rval = (announce ? ERR_NO_REGISTER : ERR_NO_FILEINFO);
}
if (!gotone) {
glog0(finfo, "Announce timed out");
rval = (announce ? ERR_NO_REGISTER : ERR_NO_FILEINFO);
}
if (open_group) {
send_regconf(finfo, attempt, regconf);
}
if ((finfo->file_id == 0) && status_file) {
for (i = 0; i < destcount; i++) {
if (destlist[i].status == DEST_ACTIVE) {
fprintf(status_file, "CONNECT;success;%s\n", destlist[i].name);
} else {
fprintf(status_file, "CONNECT;failed;%s\n", destlist[i].name);
}
}
}
free(packet);
free(decrypted);
return rval;
}
/**
* Check a transfer phase message and pass to appropriate message handler,
* decrypting first if necessary
*/
void handle_transfer_phase(unsigned char *packet,unsigned char *decrypted,
int packetlen, const union sockaddr_u *receiver,
struct finfo_t *finfo, int *got_naks)
{
struct uftp_h *header;
unsigned char *message;
int hostidx;
unsigned int decryptlen, meslen;
uint8_t *func;
header = (struct uftp_h *)packet;
hostidx = find_client(header->src_id);
if ((keytype != KEY_NONE) && (header->func == ENCRYPTED)) {
if (hostidx == -1) {
glog1(finfo, "Host %08X not in host list", ntohl(header->src_id));
send_abort(finfo, "Not in host list", receiver, header->src_id,0,0);
return;
}
if (!validate_and_decrypt(packet, packetlen, &decrypted, &decryptlen,
keytype, groupkey, groupsalt, ivlen, hashtype, grouphmackey,
hmaclen, sigtype, keyextype, destlist[hostidx].encinfo->pubkey,
destlist[hostidx].encinfo->pubkeylen)) {
glog1(finfo, "Rejecting message from %s: decrypt/validate failed",
destlist[hostidx].name);
return;
}
func = (uint8_t *)decrypted;
message = decrypted;
meslen = decryptlen;
} else {
if ((keytype != KEY_NONE) && ( (header->func == STATUS) ||
(header->func == COMPLETE) || (header->func == ABORT))) {
glog1(finfo, "Rejecting %s message from %08X: not encrypted",
func_name(header->func), ntohl(header->src_id));
return;
}
func = (uint8_t *)&header->func;
message = packet + sizeof(struct uftp_h);
meslen = packetlen - sizeof(struct uftp_h);
}
if (*func == ABORT) {
handle_abort(message, meslen, hostidx, finfo, header->src_id);
} else if (hostidx == -1) {
glog1(finfo, "Host %08X not in host list", ntohl(header->src_id));
send_abort(finfo, "Not in host list", receiver, header->src_id, 0, 0);
} else {
switch (destlist[hostidx].status) {
case DEST_ACTIVE:
case DEST_ACTIVE_NAK:
if (*func == STATUS) {
handle_status(message, meslen, finfo, hostidx, got_naks);
} else if (*func == COMPLETE) {
handle_complete(message, meslen, finfo, hostidx);
} else if (*func == CC_ACK) {
handle_cc_ack(message, meslen, finfo, hostidx);
} else {
glog1(finfo, "Received invalid message %s from %s",
func_name(*func), destlist[hostidx].name);
}
break;
case DEST_DONE:
if (*func == COMPLETE) {
handle_complete(message, meslen, finfo, hostidx);
} else {
glog1(finfo, "Received invalid message %s from %s",
func_name(*func), destlist[hostidx].name);
}
break;
}
}
return;
}
/**
* Seeks to a particular block in a file
* Returns 1 on success, 0 on error
*/
int seek_block(const struct finfo_t *finfo, int file, int block,
f_offset_t *offset)
{
f_offset_t new_offset;
if ((new_offset = lseek_func(file,
((f_offset_t)block * blocksize) - *offset, SEEK_CUR)) == -1) {
gsyserror(finfo, "lseek failed for file");
return 0;
}
if (new_offset != (f_offset_t)block * blocksize) {
glog0(finfo, "block %d: offset is %s", block, printll(new_offset));
glog0(finfo, " should be %s", printll((f_offset_t)block * blocksize));
if ((new_offset = lseek_func(file, ((f_offset_t)block * blocksize),
SEEK_SET)) == -1) {
gsyserror(finfo, "lseek failed for file");
return 0;
}
}
*offset = new_offset;
return 1;
}
/*
TODO: Have the server echo back any received NAKs, and have the
clients suppress their own NAKs based on that.
*/
/**
* Variables shared between the sending and receiving threads
*/
mux_t mux_main;
struct cc_queue_item {
unsigned char *data;
int len;
};
#define CC_QUEUE_LEN 100
static struct cc_queue_item cc_queue[CC_QUEUE_LEN];
static int cc_queue_start, cc_queue_end, end_of_pass;
static int file_done_flag, rewind_flag, rewind_pending_flag, max_time_timeout;
int rate_change;
uint32_t current_position;
uint16_t cc_seq;
uint32_t cc_rate;
double adv_grtt;
// TODO: not shared between threads, move?
int slowstart, clr, clr_drop, new_rate;
struct timeval last_clr_time;
static int file;
/**
* Read item from cc_queue. The calling thread must be holding the lock.
* Returns the head of the list, or NULL if the list is empty.
*/
void get_cc_queue(unsigned char **item, int *len)
{
if ((cc_queue_start == cc_queue_end) &&
(cc_queue[cc_queue_end].data == NULL)) {
*item = NULL;
*len = 0;
return;
}
*item = cc_queue[cc_queue_start].data;
*len = cc_queue[cc_queue_start].len;
cc_queue[cc_queue_start].data = NULL;
cc_queue[cc_queue_start++].len = 0;
if (cc_queue_start == CC_QUEUE_LEN) {
cc_queue_start = 0;
}
}
/**
* Put item on cc_queue. The calling thread must be holding the lock.
* Returns true if the item was added, false if the list is full.
*/
int put_cc_queue(const struct finfo_t *finfo, unsigned char *item, int len)
{
if ((cc_queue_start == cc_queue_end) &&
(cc_queue[cc_queue_end].data != NULL)) {
glog1(finfo, "cc_queue full");
return 0;
}
cc_queue[cc_queue_end].data = item;
cc_queue[cc_queue_end++].len = len;
if (cc_queue_end == CC_QUEUE_LEN) {
cc_queue_end = 0;
}
return 1;
}
/**
* Thread for sending all packets during the transfer phase
*/
THREAD_FUNC transfer_send_thread(void *infop)
{
unsigned char *packet, *encpacket, *data, *cc_body;
struct uftp_h *header;
struct fileseg_h *fileseg;
struct tfmcc_data_info_he *tfmcc;
int numbytes, attempt, l_file_done_flag, current_nak, cc_len, done_sent;
double l_adv_grtt;
uint16_t l_cc_seq, pass, section, last_section;
uint32_t l_cc_rate, block;
int l_packet_wait, l_rate_change, max_time;
struct timeval last_sent, current_sent, now, start_time;
int64_t overage, tdiff;
f_offset_t offset, curr_offset;
struct finfo_t *finfo;
finfo = infop;
// Not mutexed, but should be OK when the thread first starts
l_cc_seq = cc_seq;
l_cc_rate = cc_rate;
l_packet_wait = packet_wait;
l_adv_grtt = adv_grtt;
l_rate_change = 0;
packet = safe_calloc(MAXMTU, 1);
encpacket = safe_calloc(MAXMTU, 1);
header = (struct uftp_h *)packet;
fileseg = (struct fileseg_h *)(packet + sizeof(struct uftp_h));
if (cc_type == CC_TFMCC) {
tfmcc = (struct tfmcc_data_info_he *)((unsigned char *)fileseg +
sizeof(struct fileseg_h));
tfmcc->exttype = EXT_TFMCC_DATA_INFO;
tfmcc->extlen = sizeof(struct tfmcc_data_info_he) / 4;
fileseg->hlen = (sizeof(struct fileseg_h) +
sizeof(struct tfmcc_data_info_he)) / 4;
} else {
tfmcc = NULL;
fileseg->hlen = sizeof(struct fileseg_h) / 4;
}
data = (unsigned char *)fileseg + (fileseg->hlen * 4);
set_uftp_header(header, FILESEG, finfo->group_id, finfo->group_inst,
l_adv_grtt, destcount);
gettimeofday(&start_time, NULL);
gettimeofday(&last_sent, NULL);
overage = 0;
offset = 0;
lseek_func(file, 0, SEEK_SET);
fileseg->func = FILESEG;
fileseg->file_id = htons(finfo->file_id);
// If all clients received this file partially on a prior attempt,
// set the block counter at the end so we start by sending a DONE
if (finfo->partial) {
block = finfo->blocks;
} else {
block = 0;
}
done_sent = 0;
current_nak = 1;
attempt = 1;
l_file_done_flag = 0;
if ((cc_type == CC_NONE) && (rate != -1) && (txweight != 0)) {
max_time = (int)(0 + floor(((double)txweight / 100) *
((double)finfo->size / rate)));
glog2(finfo, "Maximum file transfer time: %d seconds", max_time);
} else {
max_time = 0;
}
pass = 1;
section = 0;
last_section = (uint16_t)-1;
glog2(finfo, "Sending file");
glog2(finfo, "Starting pass %u", pass);
do {
if (block < finfo->blocks) {
if (current_nak) {
glog5(finfo, "Sending %d, wait=%d", block, l_packet_wait);
attempt = 1;
// TODO: try to avoid seek on consecutive packets?
curr_offset = offset;
if (!seek_block(finfo, file, block, &curr_offset)) {
continue;
}
offset = curr_offset;
if ((numbytes = read(file, data, blocksize)) == -1) {
gsyserror(finfo, "read failed");
continue;
}
offset += numbytes;
// Keep track of how long we really slept compared to how
// long we expected to sleep. If we went over, subtract the
// time over from the next sleep time. This way we maintain
// the proper average sleep time.
if (l_packet_wait > overage) {
usleep(l_packet_wait - (int32_t)overage);
}
gettimeofday(¤t_sent, NULL);
tdiff = diff_usec(current_sent, last_sent);
if (l_packet_wait) overage += tdiff - l_packet_wait;
last_sent = current_sent;
if (log_level >= 5) {
cglog5(finfo, "tdiff=%s, ", printll(tdiff));
slog5("overage=%s", printll(overage));
}
// When rate changes significantly, clear the overage counter
if (l_rate_change) {
overage = 0;
}
header->grtt = quantize_grtt(l_adv_grtt);
if (cc_type == CC_TFMCC) {
tfmcc->send_rate = htons(quantize_rate(rate));
tfmcc->cc_seq = htons(l_cc_seq);
tfmcc->cc_rate = htons(quantize_rate(l_cc_rate));
}
if (block >= finfo->big_sections * finfo->secsize_big) {
fileseg->section = htons(((block -
(finfo->big_sections * finfo->secsize_big)) /
finfo->secsize_small) + finfo->big_sections);
fileseg->sec_block = htons((block -
(finfo->big_sections * finfo->secsize_big)) %
finfo->secsize_small);
} else {
fileseg->section = htons(block / finfo->secsize_big);
fileseg->sec_block = htons(block % finfo->secsize_big);
}
section = ntohs(fileseg->section);
if (last_section != section) {
glog2(finfo, "Sending section %u", section);
last_section = section;
}
send_data(finfo, packet, numbytes, encpacket);
done_sent = 0;
}
} else {
gettimeofday(&now, NULL);
if (!done_sent ||
(diff_usec(now, last_sent) > (3 * l_adv_grtt * 1000000))) {
if (attempt < robust) {
if (!send_done(finfo, attempt, finfo->sections ?
finfo->sections - 1 : 0, l_adv_grtt)) {
glog0(finfo, "Error sending DONE");
}
}
attempt++;
gettimeofday(&last_sent, NULL);
done_sent = 1;
}
usleep(l_packet_wait);
overage = 0;
}
// Access anything used by both threads under one mutex all at once
if (mux_lock(mux_main)) {
glog0(finfo, "Failed to lock mutex in transfer_send_thread");
continue;
}
if (max_time) {
gettimeofday(&now, NULL);
if (diff_sec(now, start_time) > max_time) {
glog1(finfo, "Maximum file transfer time exceeded");
max_time_timeout = 1;
file_done_flag = 1;
}
}
if (block < finfo->blocks) {
finfo->naklist[block] = 0;
block++;
} else {
end_of_pass = 1;
}
if (rewind_flag) {
glog2(finfo, "Starting pass %u", ++pass);
block = 0;
rewind_flag = 0;
end_of_pass = 0;
last_section = (uint16_t)-1;
}
if (block < finfo->blocks) {
current_nak = finfo->naklist[block];
} else {
current_nak = 0;
}
current_position = block;
if ((attempt > robust) && !rewind_pending_flag) {
glog1(finfo, "Sending thread timed out");
file_done_flag = 1;
}
l_cc_seq = cc_seq;
l_cc_rate = cc_rate;
l_adv_grtt = adv_grtt;
l_packet_wait = packet_wait;
l_file_done_flag = file_done_flag;
l_rate_change = rate_change;
rate_change = 0;
get_cc_queue(&cc_body, &cc_len);
if (mux_unlock(mux_main)) {
glog0(finfo, "Failed to unlock mutex in transfer_send_thread");
// TODO: if we can't unlock, kill the thread and fail the file
continue;
}
if (cc_body) {
send_cong_ctrl(finfo, l_adv_grtt, l_cc_seq, l_cc_rate,
cc_body, cc_len);
free(cc_body);
cc_body = NULL;
}
} while (!l_file_done_flag);
free(packet);
free(encpacket);
THREAD_RETURN;
}
/**
* Thread for receiving all packets during the transfer phase
* Called directly from transfer_phase
*/
void transfer_receive_thread(struct finfo_t *finfo)
{
unsigned char *packet, *decrypted, *cc_body;
union sockaddr_u receiver;
struct timeval now, timeout, rewind_time, fb_end, next_cc;
struct timeval min_tstamp;
int l_file_done_flag, got_naks, cc_len;
int alldone, found_error, i, len, rcv_status, found_timeout;
int do_rewind, do_nextcc, do_halfrate;
int64_t last_clr;
double l_adv_grtt;
uint8_t tos;
packet = safe_calloc(MAXMTU, 1);
decrypted = safe_calloc(MAXMTU, 1);
alldone = 0;
rewind_time.tv_sec = 0;
rewind_time.tv_usec = 0;
got_naks = 0;
next_cc.tv_sec = 0;
next_cc.tv_usec = 0;
// Not mutexed, but should be OK when the thread first starts
l_adv_grtt = adv_grtt;
glog4(finfo, "adv_grtt=%.3f", l_adv_grtt);
if (cc_type == CC_TFMCC) {
// Start a feedback round
gettimeofday(&last_clr_time, NULL);
gettimeofday(&fb_end, NULL);
add_timeval_d(&fb_end, 6 * l_adv_grtt);
} else {
fb_end.tv_sec = 0;
fb_end.tv_usec = 0;
}
l_file_done_flag = 0;
do {
do_rewind = 0;
do_nextcc = 0;
do_halfrate = 0;
gettimeofday(&now, NULL);
if ((cc_type == CC_TFMCC) && (cmptimestamp(now, next_cc) > 0)) {
create_cc_list(&cc_body, &cc_len);
if (!put_cc_queue(finfo, cc_body, cc_len)) {
glog1(finfo, "Couldn't queue up CONG_CTRL: list full!");
free(cc_body);
} else {
gettimeofday(&next_cc, NULL);
add_timeval_d(&next_cc, 1 * l_adv_grtt);
}
glog3(finfo, "CONG_CTRL queued");
// TODO: bypass this check if selected less that 10 RTT ago?
if (diff_usec(now, last_clr_time) > 1000000 * 4 * l_adv_grtt) {
do_halfrate = 1;
glog5(finfo, "Halfing rate");
}
if (diff_usec(now, last_clr_time) > 1000000 * robust * l_adv_grtt) {
clr = -1;
clr_drop = 1;
glog5(finfo, "Lost clr");
}
}
if ((rewind_time.tv_sec) && (cmptimestamp(now, rewind_time) >= 0)) {
do_rewind = 1;
}
if ((fb_end.tv_sec) && (cmptimestamp(now, fb_end) >= 0)) {
do_nextcc = 1;
}
if (do_rewind || do_nextcc || do_halfrate) {
if (mux_lock(mux_main)) {
glog0(finfo, "Failed to lock mutex in transfer_receive_thread "
"for rewind / feedback");
continue;
}
}
if (do_rewind) {
glog3(finfo, "Rewind timer tripped");
rewind_flag = 1;
rewind_time.tv_sec = 0;
rewind_time.tv_usec = 0;
got_naks = 0;
for (i = 0; i < destcount; i++) {
if (destlist[i].status == DEST_ACTIVE_NAK) {
destlist[i].status = DEST_ACTIVE;
}
}
}
if (do_halfrate) {
rate /= 2;
if (rate < datapacketsize / grtt) {
slowstart = 1;
rate = (int)(datapacketsize / grtt);
}
packet_wait = (int32_t)(1000000.0 * datapacketsize / rate);
rate_change = 1;
last_clr = diff_usec(now, last_clr_time);
if ((last_clr > 1000000 * 2 * robust * l_adv_grtt) &&
(last_clr > 1000000 * 5)) {
// No new CLR chosen in 2*robust RTTs (or 5 seconds) since the
// prior one dropped, meaning no feedback from anyone, so quit
glog2(finfo, "No feedback in %d GRTTs", 2 * robust);
file_done_flag = 1;
}
}
if (do_nextcc) {
// TODO: Handle extended feedback round
if (clr_drop) {
clr_drop = 0;
if (new_rate) {
rate = new_rate;
}
packet_wait = (int32_t)(1000000.0 * datapacketsize / rate);
rate_change = 1;
}
recalculate_grtt(finfo, 1, 1);
adv_grtt = (double)datapacketsize / rate;
if (adv_grtt < grtt) {
adv_grtt = grtt;
}
l_adv_grtt = adv_grtt;
glog5(finfo, "adv_grtt=%.3f", l_adv_grtt);
if (rate < datapacketsize / grtt) {
slowstart = 1;
rate = (int)(datapacketsize / grtt);
packet_wait = (int32_t)(1000000.0 * datapacketsize / rate);
rate_change = 1;
}
gettimeofday(&fb_end, NULL);
add_timeval_d(&fb_end, 6 * l_adv_grtt);
cc_rate = 0xFFFFFFFF;
cc_seq++;
glog4(finfo, "Starting feedback round %d", cc_seq);
}
if (do_rewind || do_nextcc || do_halfrate) {
if (mux_unlock(mux_main)) {
glog0(finfo, "Failed to unlock mutex in "
"transfer_receive_thread for rewind / feedback");
continue;
}
}
found_timeout = 0;
if (rewind_time.tv_sec) {
min_tstamp = rewind_time;
found_timeout = 1;
}
if (fb_end.tv_sec) {
if (!found_timeout || (cmptimestamp(fb_end, min_tstamp) < 0)) {
min_tstamp = fb_end;
found_timeout = 1;
}
}
if (cc_type == CC_TFMCC) {
if (!found_timeout || (cmptimestamp(next_cc, min_tstamp) < 0)) {
min_tstamp = next_cc;
found_timeout = 1;
}
}
if (found_timeout) {
timeout = diff_timeval(min_tstamp, now);
} else {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
add_timeval_d(&timeout, 1 * l_adv_grtt);
}
if ((rcv_status = read_packet(sock, &receiver, packet, &len,
MAXMTU, &timeout, &tos)) == -1) {
continue;
} else if (rcv_status == 0) {
// Timeouts get handled at the top of the loop
} else if (validate_packet(packet, len, finfo)) {
handle_transfer_phase(packet, decrypted, len, &receiver, finfo,
&got_naks);
for (i = 0, alldone = 1; (i < destcount) && alldone; i++) {
alldone = alldone && ((destlist[i].status == DEST_DONE) ||
(client_error(i)) || (destlist[i].isproxy));
}
}
if (mux_lock(mux_main)) {
glog0(finfo, "Failed to lock mutex in transfer_receive_thread");
continue;
}
if (alldone || user_abort) {
file_done_flag = 1;
} else if (got_naks && end_of_pass && (rewind_time.tv_sec == 0)) {
gettimeofday(&rewind_time, NULL);
add_timeval_d(&rewind_time, 3 * l_adv_grtt);
glog3(finfo, "Starting rewind timer");