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Justin Bradford's patch for increased proxy robustness.

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[originally from svn r2111]
This commit is contained in:
Simon Tatham
2002-10-22 09:40:38 +00:00
parent 45c494ff9d
commit d32e06c1fe
3 changed files with 86 additions and 31 deletions
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93
proxy.c
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@ -22,43 +22,50 @@ void proxy_activate (Proxy_Socket p)
{
void *data;
int len;
long output_before, output_after;
p->state = PROXY_STATE_ACTIVE;
/* let's try to keep extra receive events from coming through */
/* we want to ignore new receive events until we have sent
* all of our buffered receive data.
*/
sk_set_frozen(p->sub_socket, 1);
/* how many bytes of output have we buffered? */
output_before = bufchain_size(&p->pending_oob_output_data) +
bufchain_size(&p->pending_output_data);
/* and keep track of how many bytes do not get sent. */
output_after = 0;
/* send buffered OOB writes */
while (bufchain_size(&p->pending_oob_output_data) > 0) {
bufchain_prefix(&p->pending_oob_output_data, &data, &len);
sk_write_oob(p->sub_socket, data, len);
output_after += sk_write_oob(p->sub_socket, data, len);
bufchain_consume(&p->pending_oob_output_data, len);
}
bufchain_clear(&p->pending_oob_output_data);
/* send buffered normal writes */
while (bufchain_size(&p->pending_output_data) > 0) {
bufchain_prefix(&p->pending_output_data, &data, &len);
sk_write(p->sub_socket, data, len);
output_after += sk_write(p->sub_socket, data, len);
bufchain_consume(&p->pending_output_data, len);
}
bufchain_clear(&p->pending_output_data);
/* if we managed to send any data, let the higher levels know. */
if (output_after < output_before)
plug_sent(p->plug, output_after);
/* if we were asked to flush the output during
* the proxy negotiation process, do so now.
*/
if (p->pending_flush) sk_flush(p->sub_socket);
/* forward buffered recv data to the backend */
while (bufchain_size(&p->pending_input_data) > 0) {
bufchain_prefix(&p->pending_input_data, &data, &len);
plug_receive(p->plug, 0, data, len);
bufchain_consume(&p->pending_input_data, len);
}
bufchain_clear(&p->pending_input_data);
/* now set the underlying socket to whatever freeze state they wanted */
sk_set_frozen(p->sub_socket, p->freeze);
/* if the backend wanted the socket unfrozen, try to unfreeze.
* our set_frozen handler will flush buffered receive data before
* unfreezing the actual underlying socket.
*/
if (!p->freeze)
sk_set_frozen((Socket)p, 0);
}
/* basic proxy socket functions */
@ -135,6 +142,30 @@ static void sk_proxy_set_frozen (Socket s, int is_frozen)
ps->freeze = is_frozen;
return;
}
/* handle any remaining buffered recv data first */
if (bufchain_size(&ps->pending_input_data) > 0) {
ps->freeze = is_frozen;
/* loop while we still have buffered data, and while we are
* unfrozen. the plug_receive call in the loop could result
* in a call back into this function refreezing the socket,
* so we have to check each time.
*/
while (!ps->freeze && bufchain_size(&ps->pending_input_data) > 0) {
char * data;
int len;
bufchain_prefix(&ps->pending_input_data, &data, &len);
plug_receive(ps->plug, 0, data, len);
bufchain_consume(&ps->pending_input_data, len);
}
/* if we're still frozen, we'll have to wait for another
* call from the backend to finish unbuffering the data.
*/
if (ps->freeze) return;
}
sk_set_frozen(ps->sub_socket, is_frozen);
}
@ -314,8 +345,6 @@ Socket new_connection(SockAddr addr, char *hostname,
ret->remote_addr = addr;
ret->remote_port = port;
/* XXX review these initialisations, and initialise other fields
* in Proxy_Socket structure */
ret->error = NULL;
ret->pending_flush = 0;
ret->freeze = 0;
@ -326,7 +355,8 @@ Socket new_connection(SockAddr addr, char *hostname,
ret->sub_socket = NULL;
ret->state = PROXY_STATE_NEW;
ret->negotiate = NULL;
if (cfg.proxy_type == PROXY_HTTP) {
ret->negotiate = proxy_http_negotiate;
} else if (cfg.proxy_type == PROXY_SOCKS) {
@ -1069,7 +1099,7 @@ int proxy_telnet_negotiate (Proxy_Socket p, int change)
int so = 0, eo = 0;
/* we need to escape \\, \%, \r, \n, \t, \x??, \0???,
* %%, %host, and %port
* %%, %host, %port, %user, and %pass
*/
while (cfg.proxy_telnet_command[eo] != 0) {
@ -1177,27 +1207,40 @@ int proxy_telnet_negotiate (Proxy_Socket p, int change)
}
} else {
/* % escape. we recognize %%, %host, %port. anything else,
* we just send unescaped (including the %). */
/* % escape. we recognize %%, %host, %port, %user, %pass.
* anything else, we just send unescaped (including the %).
*/
if (cfg.proxy_telnet_command[eo] == '%') {
sk_write(p->sub_socket, "%", 1);
eo++;
}
}
else if (strnicmp(cfg.proxy_telnet_command + eo,
"host", 4) == 0) {
char dest[64];
sk_getaddr(p->remote_addr, dest, 64);
sk_write(p->sub_socket, dest, strlen(dest));
eo += 4;
}
}
else if (strnicmp(cfg.proxy_telnet_command + eo,
"port", 4) == 0) {
char port[8];
sprintf(port, "%i", p->remote_port);
sk_write(p->sub_socket, port, strlen(port));
eo += 4;
}
}
else if (strnicmp(cfg.proxy_telnet_command + eo,
"user", 4) == 0) {
sk_write(p->sub_socket, cfg.proxy_username,
strlen(cfg.proxy_username));
eo += 4;
}
else if (strnicmp(cfg.proxy_telnet_command + eo,
"pass", 4) == 0) {
sk_write(p->sub_socket, cfg.proxy_password,
strlen(cfg.proxy_password));
eo += 4;
}
else {
/* we don't escape this, so send the % now, and
* don't advance eo, so that we'll consider the