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authorPřemysl Janouch <p.janouch@gmail.com>2015-07-21 23:56:05 +0200
committerPřemysl Janouch <p.janouch@gmail.com>2015-07-21 23:56:05 +0200
commit0fc8ea6a66001c32c1c9f865c1ae5b921aaff681 (patch)
tree50d0d5200fc4a281336a818cdeb6d54b9f3d2d08 /common.c
parente4af4706396c6aa20700e956b9b3ca5520c183b6 (diff)
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SOCKS: refactor
Diffstat (limited to 'common.c')
-rw-r--r--common.c342
1 files changed, 177 insertions, 165 deletions
diff --git a/common.c b/common.c
index ae92ecc..530a367 100644
--- a/common.c
+++ b/common.c
@@ -326,7 +326,7 @@ connector_add_target (struct connector *self,
// --- SOCKS 5/4a --------------------------------------------------------------
-// Asynchronous SOCKS connector. Adds more stuff on top of the original.
+// Asynchronous SOCKS connector. Adds more stuff on top of the regular one.
// Note that the `username' is used differently in SOCKS 4a and 5. In the
// former version, it is the username that you can get ident'ed against.
@@ -396,7 +396,9 @@ struct socks_connector
uint16_t bound_port; ///< Bound port at the server
/// Process incoming data if there's enough of it available
- bool (*on_data) (struct socks_connector *);
+ bool (*on_data) (struct socks_connector *, struct msg_unpacker *);
+
+ size_t data_needed; ///< How much data the callback needs
// Configuration:
@@ -436,76 +438,16 @@ struct socks_connector
return false; \
BLOCK_END
-#define SOCKS_READ_START(n) \
- if (!socks_try_fill_read_buffer (self, (n))) \
- return false; \
- if (self->read_buffer.len < n) \
- return true; \
- struct msg_unpacker unpacker; \
- msg_unpacker_init (&unpacker, self->read_buffer.str, self->read_buffer.len)
-
-#define SOCKS_READ_END \
- str_remove_slice (&self->read_buffer, 0, unpacker.offset)
-
-static bool
-socks_try_fill_read_buffer (struct socks_connector *self, size_t n)
-{
- ssize_t remains = (ssize_t) n - (ssize_t) self->read_buffer.len;
- if (remains <= 0)
- return true;
-
- ssize_t received;
- str_ensure_space (&self->read_buffer, remains);
- do
- received = recv (self->socket_fd,
- self->read_buffer.str + self->read_buffer.len, remains, 0);
- while ((received == -1) && errno == EINTR);
-
- if (received == 0)
- SOCKS_FAIL ("%s: %s", "protocol error", "unexpected EOF");
- if (received == -1 && errno != EAGAIN)
- SOCKS_FAIL ("%s: %s", "recv", strerror (errno));
- if (received > 0)
- self->read_buffer.len += received;
- return true;
-}
-
-static bool
-socks_try_flush_write_buffer (struct socks_connector *self)
-{
- struct str *wb = &self->write_buffer;
- ssize_t n_written;
-
- while (wb->len)
- {
- n_written = send (self->socket_fd, wb->str, wb->len, 0);
- if (n_written >= 0)
- {
- str_remove_slice (wb, 0, n_written);
- continue;
- }
-
- if (errno == EAGAIN)
- break;
- if (errno == EINTR)
- continue;
-
- SOCKS_FAIL ("%s: %s", "send", strerror (errno));
- return false;
- }
- return true;
-}
+#define SOCKS_DATA_CB(name) static bool name \
+ (struct socks_connector *self, struct msg_unpacker *unpacker)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-static bool
-socks_4a_finish (struct socks_connector *self)
+SOCKS_DATA_CB (socks_4a_finish)
{
- SOCKS_READ_START (8);
uint8_t null, status;
- hard_assert (msg_unpacker_u8 (&unpacker, &null));
- hard_assert (msg_unpacker_u8 (&unpacker, &status));
- SOCKS_READ_END;
+ hard_assert (msg_unpacker_u8 (unpacker, &null));
+ hard_assert (msg_unpacker_u8 (unpacker, &status));
if (null != 0)
SOCKS_FAIL ("protocol error");
@@ -571,79 +513,65 @@ socks_4a_start (struct socks_connector *self)
}
self->on_data = socks_4a_finish;
+ self->data_needed = 8;
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-static bool
-socks_5_request_port (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_port)
{
- SOCKS_READ_START (2);
- hard_assert (msg_unpacker_u16 (&unpacker, &self->bound_port));
- SOCKS_READ_END;
-
+ hard_assert (msg_unpacker_u16 (unpacker, &self->bound_port));
self->done = true;
return false;
}
-static bool
-socks_5_request_ipv4 (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_ipv4)
{
- size_t len = sizeof self->bound_address.data.ipv4;
- SOCKS_READ_START (len);
- memcpy (self->bound_address.data.ipv4, self->read_buffer.str, len);
- str_remove_slice (&self->read_buffer, 0, len);
+ memcpy (self->bound_address.data.ipv4,
+ self->read_buffer.str, self->data_needed);
self->on_data = socks_5_request_port;
+ self->data_needed = 2;
return true;
}
-static bool
-socks_5_request_ipv6 (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_ipv6)
{
- size_t len = sizeof self->bound_address.data.ipv6;
- SOCKS_READ_START (len);
- memcpy (self->bound_address.data.ipv6, self->read_buffer.str, len);
- str_remove_slice (&self->read_buffer, 0, len);
+ memcpy (self->bound_address.data.ipv6,
+ self->read_buffer.str, self->data_needed);
self->on_data = socks_5_request_port;
+ self->data_needed = 2;
return true;
}
-static bool
-socks_5_request_domain_data (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_domain_data)
{
- size_t len = self->bound_address_len;
- SOCKS_READ_START (len);
- self->bound_address.data.domain = xstrndup (self->read_buffer.str, len);
- str_remove_slice (&self->read_buffer, 0, len);
+ self->bound_address.data.domain =
+ xstrndup (self->read_buffer.str, self->data_needed);
self->on_data = socks_5_request_port;
+ self->data_needed = 2;
return true;
}
-static bool
-socks_5_request_domain (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_domain)
{
- SOCKS_READ_START (1);
- hard_assert (msg_unpacker_u8 (&unpacker, &self->bound_address_len));
- SOCKS_READ_END;
+ hard_assert (msg_unpacker_u8 (unpacker, &self->bound_address_len));
self->on_data = socks_5_request_domain_data;
+ self->data_needed = self->bound_address_len;
return true;
}
-static bool
-socks_5_request_finish (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_request_finish)
{
- SOCKS_READ_START (4);
uint8_t version, status, reserved, type;
- hard_assert (msg_unpacker_u8 (&unpacker, &version));
- hard_assert (msg_unpacker_u8 (&unpacker, &status));
- hard_assert (msg_unpacker_u8 (&unpacker, &reserved));
- hard_assert (msg_unpacker_u8 (&unpacker, &type));
- SOCKS_READ_END;
+ hard_assert (msg_unpacker_u8 (unpacker, &version));
+ hard_assert (msg_unpacker_u8 (unpacker, &status));
+ hard_assert (msg_unpacker_u8 (unpacker, &reserved));
+ hard_assert (msg_unpacker_u8 (unpacker, &type));
if (version != 0x05)
SOCKS_FAIL ("protocol error");
@@ -665,10 +593,20 @@ socks_5_request_finish (struct socks_connector *self)
switch ((self->bound_address.type = type))
{
- case SOCKS_IPV4: self->on_data = socks_5_request_ipv4; return true;
- case SOCKS_IPV6: self->on_data = socks_5_request_ipv6; return true;
- case SOCKS_DOMAIN: self->on_data = socks_5_request_domain; return true;
- default: SOCKS_FAIL ("protocol error");
+ case SOCKS_IPV4:
+ self->on_data = socks_5_request_ipv4;
+ self->data_needed = sizeof self->bound_address.data.ipv4;
+ return true;
+ case SOCKS_IPV6:
+ self->data_needed = sizeof self->bound_address.data.ipv6;
+ self->on_data = socks_5_request_ipv6;
+ return true;
+ case SOCKS_DOMAIN:
+ self->on_data = socks_5_request_domain;
+ self->data_needed = 1;
+ return true;
+ default:
+ SOCKS_FAIL ("protocol error");
}
}
@@ -707,17 +645,17 @@ socks_5_request_start (struct socks_connector *self)
str_append_c (wb, target->port);
self->on_data = socks_5_request_finish;
+ self->data_needed = 4;
return true;
}
-static bool
-socks_5_userpass_finish (struct socks_connector *self)
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+SOCKS_DATA_CB (socks_5_userpass_finish)
{
- SOCKS_READ_START (2);
uint8_t version, status;
- hard_assert (msg_unpacker_u8 (&unpacker, &version));
- hard_assert (msg_unpacker_u8 (&unpacker, &status));
- SOCKS_READ_END;
+ hard_assert (msg_unpacker_u8 (unpacker, &version));
+ hard_assert (msg_unpacker_u8 (unpacker, &status));
if (version != 0x01)
SOCKS_FAIL ("protocol error");
@@ -745,17 +683,15 @@ socks_5_userpass_start (struct socks_connector *self)
str_append_data (wb, self->password, plen);
self->on_data = socks_5_userpass_finish;
+ self->data_needed = 2;
return true;
}
-static bool
-socks_5_auth_finish (struct socks_connector *self)
+SOCKS_DATA_CB (socks_5_auth_finish)
{
- SOCKS_READ_START (2);
uint8_t version, method;
- hard_assert (msg_unpacker_u8 (&unpacker, &version));
- hard_assert (msg_unpacker_u8 (&unpacker, &method));
- SOCKS_READ_END;
+ hard_assert (msg_unpacker_u8 (unpacker, &version));
+ hard_assert (msg_unpacker_u8 (unpacker, &method));
if (version != 0x05)
SOCKS_FAIL ("protocol error");
@@ -791,12 +727,72 @@ socks_5_auth_start (struct socks_connector *self)
str_append_c (wb, 0x02); // username/password
self->on_data = socks_5_auth_finish;
+ self->data_needed = 2;
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-static void socks_connector_step (struct socks_connector *self);
+static void socks_connector_start (struct socks_connector *self);
+
+static void
+socks_connector_fail (struct socks_connector *self)
+{
+ poller_fd_reset (&self->socket_event);
+ self->on_failure (self->user_data);
+}
+
+static bool
+socks_connector_step_iterators (struct socks_connector *self)
+{
+ // At the lowest level we iterate over all addresses for the SOCKS server;
+ // this is done automatically by the connector
+
+ // Then we iterate over available protocols
+ if (++self->protocol_iter != SOCKS_MAX)
+ return true;
+
+ // At the highest level we iterate over possible targets
+ self->protocol_iter = 0;
+ if (self->targets_iter && (self->targets_iter = self->targets_iter->next))
+ return true;
+
+ return false;
+}
+
+static void
+socks_connector_step (struct socks_connector *self)
+{
+ if (self->socket_fd != -1)
+ {
+ poller_fd_reset (&self->socket_event);
+ xclose (self->socket_fd);
+ self->socket_fd = -1;
+ }
+
+ if (self->connector)
+ {
+ connector_free (self->connector);
+ free (self->connector);
+ self->connector = NULL;
+ }
+
+ if (socks_connector_step_iterators (self))
+ socks_connector_start (self);
+ else
+ socks_connector_fail (self);
+}
+
+static void
+socks_connector_on_timeout (struct socks_connector *self)
+{
+ if (self->on_error)
+ self->on_error (self->user_data, "timeout");
+
+ socks_connector_fail (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
socks_connector_on_connected (void *user_data, int socket_fd)
@@ -814,7 +810,7 @@ socks_connector_on_connected (void *user_data, int socket_fd)
|| (self->protocol_iter == SOCKS_4A && socks_4a_start (self)))
return;
- self->on_failure (self->user_data);
+ socks_connector_fail (self);
}
static void
@@ -870,45 +866,71 @@ socks_connector_start (struct socks_connector *self)
self->done = false;
}
-static void
-socks_connector_step (struct socks_connector *self)
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+socks_try_fill_read_buffer (struct socks_connector *self, size_t n)
{
- // Close the socket if needed
- if (self->socket_fd != -1)
- {
- poller_fd_reset (&self->socket_event);
- xclose (self->socket_fd);
- self->socket_fd = -1;
- }
+ ssize_t remains = (ssize_t) n - (ssize_t) self->read_buffer.len;
+ if (remains <= 0)
+ return true;
- // Destroy current connector if needed
- if (self->connector)
- {
- connector_free (self->connector);
- free (self->connector);
- self->connector = NULL;
- }
+ ssize_t received;
+ str_ensure_space (&self->read_buffer, remains);
+ do
+ received = recv (self->socket_fd,
+ self->read_buffer.str + self->read_buffer.len, remains, 0);
+ while ((received == -1) && errno == EINTR);
- // At the lowest level we iterate over all addresses for the SOCKS server;
- // this is done automatically by the connector
+ if (received == 0)
+ SOCKS_FAIL ("%s: %s", "protocol error", "unexpected EOF");
+ if (received == -1 && errno != EAGAIN)
+ SOCKS_FAIL ("%s: %s", "recv", strerror (errno));
+ if (received > 0)
+ self->read_buffer.len += received;
+ return true;
+}
- // Then we iterate over available protocols
- if (++self->protocol_iter != SOCKS_MAX)
- {
- socks_connector_start (self);
- return;
- }
+static bool
+socks_call_on_data (struct socks_connector *self)
+{
+ size_t to_consume = self->data_needed;
+ if (!socks_try_fill_read_buffer (self, to_consume))
+ return false;
+ if (self->read_buffer.len < to_consume)
+ return true;
- // At the highest level we iterate over possible targets
- self->protocol_iter = 0;
- if (self->targets_iter && (self->targets_iter = self->targets_iter->next))
+ struct msg_unpacker unpacker;
+ msg_unpacker_init (&unpacker, self->read_buffer.str, self->read_buffer.len);
+ bool result = self->on_data (self, &unpacker);
+ str_remove_slice (&self->read_buffer, 0, to_consume);
+ return result;
+}
+
+static bool
+socks_try_flush_write_buffer (struct socks_connector *self)
+{
+ struct str *wb = &self->write_buffer;
+ ssize_t n_written;
+
+ while (wb->len)
{
- socks_connector_start (self);
- return;
- }
+ n_written = send (self->socket_fd, wb->str, wb->len, 0);
+ if (n_written >= 0)
+ {
+ str_remove_slice (wb, 0, n_written);
+ continue;
+ }
- // FIXME: we need to cancel all events
- self->on_failure (self->user_data);
+ if (errno == EAGAIN)
+ break;
+ if (errno == EINTR)
+ continue;
+
+ SOCKS_FAIL ("%s: %s", "send", strerror (errno));
+ return false;
+ }
+ return true;
}
static void
@@ -917,7 +939,7 @@ socks_connector_on_ready
{
(void) pfd;
- if (self->on_data (self) && socks_try_flush_write_buffer (self))
+ if (socks_call_on_data (self) && socks_try_flush_write_buffer (self))
{
poller_fd_set (&self->socket_event,
self->write_buffer.len ? (POLLIN | POLLOUT) : POLLIN);
@@ -935,16 +957,6 @@ socks_connector_on_ready
socks_connector_step (self);
}
-static void
-socks_connector_on_timeout (struct socks_connector *self)
-{
- if (self->on_error)
- self->on_error (self->user_data, "timeout");
-
- // FIXME: we need to cancel all events
- self->on_failure (self->user_data);
-}
-
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void