static void direct_write_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
redsocks_touch_client(client);
if (client->state == 0)
{
client->state = 1;
if (redsocks_start_relay(client))
// Failed to start relay. Connection is dropped.
return;
// Write any data received from client to relay
if (evbuffer_get_length(bufferevent_get_input(client->client)))
client->instance->relay_ss->writecb(buffev, client);
}
}
static void socks4_write_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
redsocks_touch_client(client);
if (client->state == socks4_new) {
redsocks_write_helper(
buffev, client,
socks4_mkconnect, socks4_request_sent, sizeof(socks4_reply)
);
}
else if (client->state >= socks4_request_sent) {
bufferevent_disable(buffev, EV_WRITE);
}
}
static void httpc_write_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
redsocks_touch_client(client);
if (client->state == httpc_new) {
redsocks_write_helper_ex(
buffev, client,
httpc_mkconnect, httpc_request_sent, 1, HTTP_HEAD_WM_HIGH
);
}
else if (client->state >= httpc_request_sent) {
bufferevent_disable(buffev, EV_WRITE);
}
}
static void auto_relay_connected(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
autoproxy_client * aclient = (void*)(client + 1) + client->instance->relay_ss->payload_len;
assert(buffev == client->relay);
redsocks_touch_client(client);
if (!red_is_socket_connected_ok(buffev)) {
if (aclient->state == AUTOPROXY_NEW && !auto_retry_or_drop(client))
return;
redsocks_log_error(client, LOG_DEBUG, "failed to connect to proxy");
goto fail;
}
/* update client state */
aclient->state = AUTOPROXY_CONNECTED;
/* We do not need to detect timeouts any more.
The two peers will handle it. */
bufferevent_set_timeouts(client->relay, NULL, NULL);
if (!redsocks_start_relay(client))
{
/* overwrite theread callback to my function */
client->client->readcb = direct_relay_clientreadcb;
client->client->writecb = direct_relay_clientwritecb;
client->relay->readcb = direct_relay_relayreadcb;
client->relay->writecb = direct_relay_relaywritecb;
}
else
{
redsocks_log_error(client, LOG_DEBUG, "failed to start relay");
goto fail;
}
client->relay->writecb(buffev, _arg);
return;
fail:
redsocks_drop_client(client);
}
static void auto_read_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
redsocks_touch_client(client);
if (client->state == socks5_pre_detect) {
/* Should never be here */
/*
client->state = socks5_direct;
redsocks_start_relay(client);
*/
}
else if (client->state == socks5_direct) {
/* if (EVBUFFER_LENGTH(buffev->input) == 0 && client->relay_evshut & EV_READ) */
}
else {
socks5_read_cb(buffev, _arg);
}
}
static void direct_relay_clientreadcb(struct bufferevent *from, void *_client)
{
redsocks_client *client = _client;
socks5_client *socks5 = (void*)(client + 1);
redsocks_touch_client(client);
if (client->state == socks5_direct)
{
if (socks5->data_sent && socks5->got_data)
{
/* No CONNECTION RESET error occur after sending data, good. */
client->state = socks5_direct_confirmed;
if (evbuffer_get_length(from->input))
{
evbuffer_drain(from->input, socks5->data_sent);
socks5->data_sent = 0;
}
}
}
direct_relay_readcb_helper(client, client->client, client->relay);
}
static void direct_relay_clientreadcb(struct bufferevent *from, void *_client)
{
redsocks_client *client = _client;
autoproxy_client * aclient = (void*)(client + 1) + client->instance->relay_ss->payload_len;
redsocks_touch_client(client);
if (aclient->state == AUTOPROXY_CONNECTED)
{
if (aclient->data_sent && aclient->data_recv)
{
/* No CONNECTION RESET error occur after sending data, good. */
aclient->state = AUTOPROXY_CONFIRMED;
on_connection_confirmed(client);
if (evbuffer_get_length(from->input))
{
evbuffer_drain(from->input, aclient->data_sent);
aclient->data_sent = 0;
}
}
}
direct_relay_readcb_helper(client, client->client, client->relay);
}
static void socks5_read_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
socks5_client *socks5 = red_payload(client);
redsocks_touch_client(client);
if (client->state == socks5_method_sent) {
socks5_read_auth_methods(buffev, client, socks5);
}
else if (client->state == socks5_auth_sent) {
socks5_read_auth_reply(buffev, client, socks5);
}
else if (client->state == socks5_request_sent) {
socks5_read_reply(buffev, client, socks5);
}
else if (client->state == socks5_skip_domain) {
socks5_addr_ipv4 ipv4; // all socks5_addr*.port are equal
uint8_t size;
if (redsocks_read_expected(client, buffev->input, &size, sizes_greater_equal, sizeof(size)) < 0)
return;
socks5->to_skip = size + sizeof(ipv4.port);
redsocks_write_helper(
buffev, client,
NULL, socks5_skip_address, socks5->to_skip
);
}
else if (client->state == socks5_skip_address) {
uint8_t data[socks5->to_skip];
if (redsocks_read_expected(client, buffev->input, data, sizes_greater_equal, socks5->to_skip) < 0)
return;
redsocks_start_relay(client);
}
else {
redsocks_drop_client(client);
}
}
static void auto_write_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
redsocks_touch_client(client);
if (client->state == socks5_pre_detect) {
client->state = socks5_direct;
if (!redsocks_start_relay(client))
{
/* overwrite theread callback to my function */
client->client->readcb = direct_relay_clientreadcb;
client->client->writecb = direct_relay_clientwritecb;
client->relay->readcb = direct_relay_relayreadcb;
client->relay->writecb = direct_relay_relaywritecb;
}
}
else if (client->state == socks5_direct)
redsocks_log_error(client, LOG_DEBUG, "Should not be here!");
else
socks5_write_cb(buffev, _arg);
}
static void direct_relay_clientwritecb(struct bufferevent *to, void *_client)
{
redsocks_client *client = _client;
socks5_client *socks5 = (void*)(client + 1);
struct bufferevent * from = client->relay;
redsocks_touch_client(client);
if (EVBUFFER_LENGTH(from->input) == 0 && (client->relay_evshut & EV_READ)) {
redsocks_shutdown(client, to, SHUT_WR);
return;
}
if (client->state == socks5_direct)
{
if (!socks5->got_data)
socks5->got_data = EVBUFFER_LENGTH(from->input);
}
if (EVBUFFER_LENGTH(to->output) < to->wm_write.high) {
if (bufferevent_write_buffer(to, from->input) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_write_buffer");
if (bufferevent_enable(from, EV_READ) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_enable");
}
}
static void direct_relay_clientwritecb(struct bufferevent *to, void *_client)
{
redsocks_client *client = _client;
autoproxy_client * aclient = (void*)(client + 1) + client->instance->relay_ss->payload_len;
struct bufferevent * from = client->relay;
redsocks_touch_client(client);
if (EVBUFFER_LENGTH(from->input) == 0 && (client->relay_evshut & EV_READ)) {
redsocks_shutdown(client, to, SHUT_WR);
return;
}
if (aclient->state == AUTOPROXY_CONNECTED)
{
if (!aclient->data_recv)
aclient->data_recv = EVBUFFER_LENGTH(from->input);
}
if (EVBUFFER_LENGTH(to->output) < to->wm_write.high) {
if (bufferevent_write_buffer(to, from->input) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_write_buffer");
if (bufferevent_enable(from, EV_READ) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_enable");
}
}
static void httpr_client_read_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
httpr_client *httpr = (void*)(client + 1);
redsocks_touch_client(client);
if (client->state >= httpr_recv_request_headers) {
httpr_client_read_content(buffev, client);
return;
}
char *line = NULL;
int connect_relay = 0;
while (!connect_relay && (line = redsocks_evbuffer_readline(buffev->input))) {
int skip_line = 0;
int do_drop = 0;
if (strlen(line) > 0) {
if (!httpr->firstline) {
httpr->firstline = line;
line = 0;
}
else if (strncasecmp(line, "Host", 4) == 0) {
httpr->has_host = 1;
char *ptr = line + 5;
while (*ptr && isspace(*ptr))
ptr ++;
httpr->host = calloc(strlen(ptr) + 1, 1);
strcpy(httpr->host, ptr);
} else if (strncasecmp(line, "Proxy-Connection", 16) == 0)
skip_line = 1;
else if (strncasecmp(line, "Connection", 10) == 0)
skip_line = 1;
}
else { // last line of request
if (!httpr->firstline || httpr_toss_http_firstline(client) < 0)
do_drop = 1;
if (!httpr->has_host) {
char host[32]; // "Host: 123.456.789.012:34567"
int written_wo_null = snprintf(host, sizeof(host), "Host: %s",
fmt_http_host(client->destaddr));
UNUSED(written_wo_null);
assert(0 < written_wo_null && written_wo_null < sizeof(host));
if (httpr_append_header(client, host) < 0)
do_drop = 1;
}
if (httpr_append_header(client, "Proxy-Connection: close") < 0)
do_drop = 1;
if (httpr_append_header(client, "Connection: close") < 0)
do_drop = 1;
connect_relay = 1;
}
if (line && !skip_line)
if (httpr_append_header(client, line) < 0)
do_drop = 1;
free(line);
if (do_drop) {
redsocks_drop_client(client);
return;
}
}
if (connect_relay) {
client->state = httpr_recv_request_headers;
httpr_client_read_content(buffev, client);
redsocks_connect_relay(client);
}
}
static void httpr_relay_write_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
httpr_client *httpr = (void*)(client + 1);
int len = 0;
assert(client->state >= httpr_recv_request_headers);
redsocks_touch_client(client);
if (client->state == httpr_recv_request_headers) {
if (httpr->firstline) {
len = bufferevent_write(client->relay, httpr->firstline, strlen(httpr->firstline));
if (len < 0) {
redsocks_log_errno(client, LOG_ERR, "bufferevent_write");
redsocks_drop_client(client);
return;
}
}
http_auth *auth = (void*)(client->instance + 1);
++auth->last_auth_count;
const char *auth_scheme = NULL;
char *auth_string = NULL;
if (auth->last_auth_query != NULL) {
/* find previous auth challange */
if (strncasecmp(auth->last_auth_query, "Basic", 5) == 0) {
auth_string = basic_authentication_encode(client->instance->config.login, client->instance->config.password);
auth_scheme = "Basic";
} else if (strncasecmp(auth->last_auth_query, "Digest", 6) == 0 && httpr->firstline) {
/* calculate method & uri */
char *ptr = strchr(httpr->firstline, ' '), *ptr2;
char *method = calloc(ptr - httpr->firstline + 1, 1);
memcpy(method, httpr->firstline, ptr - httpr->firstline);
method[ptr - httpr->firstline] = 0;
ptr = strchr(httpr->firstline, '/');
if (!ptr || *++ptr != '/') {
free(method);
redsocks_log_error(client, LOG_NOTICE, "malformed request came");
redsocks_drop_client(client);
return;
}
if (!(ptr = strchr(++ptr, '/')) || !(ptr2 = strchr(ptr, ' '))) {
free(method);
redsocks_log_error(client, LOG_NOTICE, "malformed request came");
redsocks_drop_client(client);
return;
}
char *uri = calloc(ptr2 - ptr + 1, 1);
memcpy(uri, ptr, ptr2 - ptr);
uri[ptr2 - ptr] = 0;
/* prepare an random string for cnounce */
char cnounce[17];
snprintf(cnounce, sizeof(cnounce), "%08x%08x", red_randui32(), red_randui32());
auth_string = digest_authentication_encode(auth->last_auth_query + 7, //line
client->instance->config.login, client->instance->config.password, //user, pass
method, uri, auth->last_auth_count, cnounce); // method, path, nc, cnounce
free(method);
free(uri);
auth_scheme = "Digest";
}
}
if (auth_string != NULL) {
len = 0;
len |= bufferevent_write(client->relay, auth_response_header, strlen(auth_response_header));
len |= bufferevent_write(client->relay, " ", 1);
len |= bufferevent_write(client->relay, auth_scheme, strlen(auth_scheme));
len |= bufferevent_write(client->relay, " ", 1);
len |= bufferevent_write(client->relay, auth_string, strlen(auth_string));
len |= bufferevent_write(client->relay, "\r\n", 2);
if (len) {
redsocks_log_errno(client, LOG_ERR, "bufferevent_write");
redsocks_drop_client(client);
return;
}
}
free(auth_string);
len = bufferevent_write(client->relay, httpr->client_buffer.buff, httpr->client_buffer.len);
if (len < 0) {
redsocks_log_errno(client, LOG_ERR, "bufferevent_write");
redsocks_drop_client(client);
return;
}
client->state = httpr_request_sent;
buffev->wm_read.low = 1;
buffev->wm_read.high = HTTP_HEAD_WM_HIGH;
bufferevent_enable(buffev, EV_READ);
}
}
static void httpr_relay_read_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
httpr_client *httpr = (void*)(client + 1);
int dropped = 0;
assert(client->state >= httpr_request_sent);
redsocks_touch_client(client);
httpr_buffer_fini(&httpr->relay_buffer);
httpr_buffer_init(&httpr->relay_buffer);
if (client->state == httpr_request_sent) {
size_t len = EVBUFFER_LENGTH(buffev->input);
char *line = redsocks_evbuffer_readline(buffev->input);
if (line) {
httpr_buffer_append(&httpr->relay_buffer, line, strlen(line));
httpr_buffer_append(&httpr->relay_buffer, "\r\n", 2);
unsigned int code;
if (sscanf(line, "HTTP/%*u.%*u %u", &code) == 1) { // 1 == one _assigned_ match
if (code == 407) { // auth failed
http_auth *auth = (void*)(client->instance + 1);
if (auth->last_auth_query != NULL && auth->last_auth_count == 1) {
redsocks_log_error(client, LOG_NOTICE, "proxy auth failed");
redsocks_drop_client(client);
dropped = 1;
} else if (client->instance->config.login == NULL || client->instance->config.password == NULL) {
redsocks_log_error(client, LOG_NOTICE, "proxy auth required, but no login information provided");
redsocks_drop_client(client);
dropped = 1;
} else {
free(line);
char *auth_request = get_auth_request_header(buffev->input);
if (!auth_request) {
redsocks_log_error(client, LOG_NOTICE, "403 found, but no proxy auth challenge");
redsocks_drop_client(client);
dropped = 1;
} else {
free(auth->last_auth_query);
char *ptr = auth_request;
ptr += strlen(auth_request_header);
while (isspace(*ptr))
ptr++;
auth->last_auth_query = calloc(strlen(ptr) + 1, 1);
strcpy(auth->last_auth_query, ptr);
auth->last_auth_count = 0;
free(auth_request);
httpr_buffer_fini(&httpr->relay_buffer);
if (bufferevent_disable(client->relay, EV_WRITE)) {
redsocks_log_errno(client, LOG_ERR, "bufferevent_disable");
return;
}
/* close relay tunnel */
redsocks_close(EVENT_FD(&client->relay->ev_write));
bufferevent_free(client->relay);
/* set to initial state*/
client->state = httpr_recv_request_headers;
/* and reconnect */
redsocks_connect_relay(client);
return;
}
}
} else if (100 <= code && code <= 999) {
client->state = httpr_reply_came;
} else {
redsocks_log_error(client, LOG_NOTICE, "%s", line);
redsocks_drop_client(client);
dropped = 1;
}
}
free(line);
}
else if (len >= HTTP_HEAD_WM_HIGH) {
redsocks_drop_client(client);
dropped = 1;
}
}
if (dropped)
return;
while (client->state == httpr_reply_came) {
char *line = redsocks_evbuffer_readline(buffev->input);
if (line) {
httpr_buffer_append(&httpr->relay_buffer, line, strlen(line));
httpr_buffer_append(&httpr->relay_buffer, "\r\n", 2);
if (strlen(line) == 0) {
client->state = httpr_headers_skipped;
}
free(line);
}
else {
break;
}
}
if (client->state == httpr_headers_skipped) {
if (bufferevent_write(client->client, httpr->relay_buffer.buff, httpr->relay_buffer.len) != 0) {
redsocks_log_error(client, LOG_NOTICE, "bufferevent_write");
redsocks_drop_client(client);
return;
}
redsocks_start_relay(client);
}
}
static void direct_relay_relaywritecb(struct bufferevent *to, void *_client)
{
redsocks_client *client = _client;
socks5_client *socks5 = (void*)(client + 1);
struct bufferevent * from = client->client;
redsocks_touch_client(client);
if (EVBUFFER_LENGTH(from->input) == 0 && (client->client_evshut & EV_READ)) {
redsocks_shutdown(client, to, SHUT_WR);
return;
}
else if (client->state == socks5_direct )
{
/* Not send or receive data. */
if (!socks5->data_sent && !socks5->got_data)
{
/* Ensure we have data to send */
if (EVBUFFER_LENGTH(from->input))
{
/* copy data from input to output of relay */
socks5->data_sent = copy_evbuffer (to, from);
redsocks_log_error(client, LOG_DEBUG, "not sent, not got %d", EVBUFFER_LENGTH(from->input));
}
}
/*
* Relay reaceived data before writing to relay.
*/
else if (!socks5->data_sent && socks5->got_data)
{
redsocks_log_error(client, LOG_DEBUG, "not sent, got");
socks5->data_sent = copy_evbuffer(to, from);
}
/* client->state = socks5_direct_confirmed; */
/* We have writen data to relay, but got nothing until we are requested to
* write to it again.
*/
else if (socks5->data_sent && !socks5->got_data)
{
/* No response from relay and no CONNECTION RESET,
Send more data.
*/
redsocks_log_error(client, LOG_DEBUG, "sent, not got in:%d out:%d high:%d sent:%d",
evbuffer_get_length(from->input),
evbuffer_get_length(to->output),
to->wm_write.high, socks5->data_sent );
/* TODO: Write more data? */
if (EVBUFFER_LENGTH(to->output) < socks5->data_sent /* data is sent out, more or less */
&& EVBUFFER_LENGTH(from->input) == from->wm_read.high /* read buffer is full */
&& EVBUFFER_LENGTH(from->input) == socks5->data_sent /* all data in read buffer is sent */
)
{
evbuffer_drain(from->input, socks5->data_sent);
socks5->data_sent = 0;
client->state = socks5_direct_confirmed;
}
}
/* We sent data to and got data from relay. */
else if (socks5->data_sent && socks5->got_data)
{
/* No CONNECTION RESET error occur after sending data, good. */
client->state = socks5_direct_confirmed;
redsocks_log_error(client, LOG_DEBUG, "sent, got %d ", socks5->got_data);
if (evbuffer_get_length(from->input))
{
evbuffer_drain(from->input, socks5->data_sent);
socks5->data_sent = 0;
}
}
}
if (client->state == socks5_direct_confirmed)
{
if (EVBUFFER_LENGTH(to->output) < to->wm_write.high) {
if (bufferevent_write_buffer(to, from->input) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_write_buffer");
if (bufferevent_enable(from, EV_READ) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_enable");
}
}
}
static void httpc_read_cb(struct bufferevent *buffev, void *_arg)
{
redsocks_client *client = _arg;
assert(client->relay == buffev);
assert(client->state == httpc_request_sent || client->state == httpc_reply_came);
redsocks_touch_client(client);
// evbuffer_add() triggers callbacks, so we can't write to client->client
// till we know that we're going to ONFAIL_FORWARD_HTTP_ERR.
// And the decision is made when all the headers are processed.
struct evbuffer* tee = NULL;
const bool do_errtee = client->instance->config.on_proxy_fail == ONFAIL_FORWARD_HTTP_ERR;
if (client->state == httpc_request_sent) {
size_t len = evbuffer_get_length(buffev->input);
char *line = redsocks_evbuffer_readline(buffev->input);
if (line) {
unsigned int code;
if (sscanf(line, "HTTP/%*u.%*u %u", &code) == 1) { // 1 == one _assigned_ match
if (code == 407) { // auth failed
http_auth *auth = red_http_auth(client->instance);
if (auth->last_auth_query != NULL && auth->last_auth_count == 1) {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy auth failed: %s", line);
client->state = httpc_no_way;
} else if (client->instance->config.login == NULL || client->instance->config.password == NULL) {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy auth required, but no login/password configured: %s", line);
client->state = httpc_no_way;
} else {
if (do_errtee)
tee = evbuffer_new();
char *auth_request = http_auth_request_header(buffev->input, tee);
if (!auth_request) {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy auth required, but no <%s> header found: %s", auth_request_header, line);
client->state = httpc_no_way;
} else {
free(line);
if (tee)
evbuffer_free(tee);
free(auth->last_auth_query);
char *ptr = auth_request;
ptr += strlen(auth_request_header);
while (isspace(*ptr))
ptr++;
size_t last_auth_query_len = strlen(ptr) + 1;
auth->last_auth_query = calloc(last_auth_query_len, 1);
memcpy(auth->last_auth_query, ptr, last_auth_query_len);
auth->last_auth_count = 0;
free(auth_request);
if (bufferevent_disable(client->relay, EV_WRITE)) {
redsocks_log_errno(client, LOG_ERR, "bufferevent_disable");
return;
}
/* close relay tunnel */
redsocks_bufferevent_free(client->relay);
/* set to initial state*/
client->state = httpc_new;
/* and reconnect */
redsocks_connect_relay(client);
return;
}
}
} else if (200 <= code && code <= 299) {
client->state = httpc_reply_came;
} else {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy error: %s", line);
client->state = httpc_no_way;
}
} else {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy bad firstline: %s", line);
client->state = httpc_no_way;
}
if (do_errtee && client->state == httpc_no_way) {
if (bufferevent_write(client->client, line, strlen(line)) != 0 ||
bufferevent_write(client->client, "\r\n", 2) != 0)
{
redsocks_log_errno(client, LOG_NOTICE, "bufferevent_write");
goto fail;
}
}
free(line);
}
else if (len >= HTTP_HEAD_WM_HIGH) {
redsocks_log_error(client, LOG_NOTICE, "HTTP Proxy reply is too long, %zu bytes", len);
client->state = httpc_no_way;
}
}
if (do_errtee && client->state == httpc_no_way) {
if (tee) {
if (bufferevent_write_buffer(client->client, tee) != 0) {
redsocks_log_errno(client, LOG_NOTICE, "bufferevent_write_buffer");
goto fail;
}
}
redsocks_shutdown(client, client->client, SHUT_RD);
const size_t avail = evbuffer_get_length(client->client->input);
if (avail) {
if (evbuffer_drain(client->client->input, avail) != 0) {
redsocks_log_errno(client, LOG_NOTICE, "evbuffer_drain");
goto fail;
}
}
redsocks_shutdown(client, client->relay, SHUT_WR);
client->state = httpc_headers_skipped;
}
fail:
if (tee) {
evbuffer_free(tee);
}
if (client->state == httpc_no_way) {
redsocks_drop_client(client);
return;
}
while (client->state == httpc_reply_came) {
char *line = redsocks_evbuffer_readline(buffev->input);
if (line) {
if (strlen(line) == 0) {
client->state = httpc_headers_skipped;
}
free(line);
}
else {
break;
}
}
if (client->state == httpc_headers_skipped) {
redsocks_start_relay(client);
}
}
static void direct_relay_relaywritecb(struct bufferevent *to, void *_client)
{
redsocks_client *client = _client;
autoproxy_client * aclient = (void*)(client + 1) + client->instance->relay_ss->payload_len;
struct bufferevent * from = client->client;
redsocks_touch_client(client);
if (EVBUFFER_LENGTH(from->input) == 0 && (client->client_evshut & EV_READ)) {
redsocks_shutdown(client, to, SHUT_WR);
return;
}
else if (aclient->state == AUTOPROXY_CONNECTED )
{
/* Not send or receive data. */
if (!aclient->data_sent && !aclient->data_recv)
{
/* Ensure we have data to send */
if (EVBUFFER_LENGTH(from->input))
{
/* copy data from input to output of relay */
aclient->data_sent = copy_evbuffer (to, from, 0);
redsocks_log_error(client, LOG_DEBUG, "not sent, not got %d", EVBUFFER_LENGTH(from->input));
}
}
/*
* Relay reaceived data before writing to relay.
*/
else if (!aclient->data_sent && aclient->data_recv)
{
redsocks_log_error(client, LOG_DEBUG, "not sent, got");
aclient->data_sent = copy_evbuffer(to, from, 0);
}
/* aclient->state = AUTOPROXY_CONFIRMED; */
/* We have writen data to relay, but got nothing until we are requested to
* write to it again.
*/
else if (aclient->data_sent && !aclient->data_recv)
{
/* No response from relay and no CONNECTION RESET,
Send more data.
*/
redsocks_log_error(client, LOG_DEBUG, "sent, not got in:%d out:%d high:%d sent:%d",
evbuffer_get_length(from->input),
evbuffer_get_length(to->output),
to->wm_write.high, aclient->data_sent );
/* Write more data util input buffer is full */
if (EVBUFFER_LENGTH(from->input)- aclient->data_sent > 0) /* we have more data waiting to be sent */
{
aclient->data_sent += copy_evbuffer(to, from, aclient->data_sent);
}
else if (EVBUFFER_LENGTH(to->output) < aclient->data_sent /* data is sent out, more or less */
&& EVBUFFER_LENGTH(from->input) == from->wm_read.high /* do not confirm unless read buffer is full */
&& EVBUFFER_LENGTH(from->input) == aclient->data_sent /* all data in read buffer is sent */
)
{
evbuffer_drain(from->input, aclient->data_sent);
aclient->data_sent = 0;
aclient->state = AUTOPROXY_CONFIRMED;
on_connection_confirmed(client);
}
}
/* We sent data to and got data from relay. */
else if (aclient->data_sent && aclient->data_recv)
{
/* No CONNECTION RESET error occur after sending data, good. */
aclient->state = AUTOPROXY_CONFIRMED;
on_connection_confirmed(client);
redsocks_log_error(client, LOG_DEBUG, "sent, got %d ", aclient->data_recv);
if (evbuffer_get_length(from->input))
{
evbuffer_drain(from->input, aclient->data_sent);
aclient->data_sent = 0;
}
}
}
if (aclient->state == AUTOPROXY_CONFIRMED)
{
if (EVBUFFER_LENGTH(to->output) < to->wm_write.high) {
if (bufferevent_write_buffer(to, from->input) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_write_buffer");
if (bufferevent_enable(from, EV_READ) == -1)
redsocks_log_errno(client, LOG_ERR, "bufferevent_enable");
}
}
}