nihilist/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2024-11-24 04:13:28 +01:00
Code Issues Packages Projects Releases Wiki Activity

Refactor rend machines, stage 1/2: Move state transition code.

Browse Source
This commit is contained in:
Mike Perry 2019-05-16 19:30:42 +00:00
parent bbb974234c
commit 0cba53c6ed
1 changed files with 32 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
src/core/or/circuitpadding_machines.c
View File

@ -284,26 +284,6 @@ setup_obf_state_for_hiding_rend_circuits(circpad_state_t *obf_state)
obf_state->histogram_total_tokens = 1;
}
/* Setup the simple state machine we use for all HS padding machines */
static void
setup_state_machine_for_hiding_rend_circuits(circpad_machine_spec_t *machine)
{
/* Two states: START, OBFUSCATE_CIRC_SETUP (and END) */
circpad_machine_states_init(machine, 2);
/* START -> OBFUSCATE_CIRC_SETUP transition upon sending the first
* non-padding cell (which is PADDING_NEGOTIATE) */
machine->states[CIRCPAD_STATE_START].
next_state[CIRCPAD_EVENT_NONPADDING_SENT] =
CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP;
/* OBFUSCATE_CIRC_SETUP -> END transition when we finish all the tokens */
machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_PADDING_RECV] = CIRCPAD_STATE_END;
machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_LENGTH_COUNT] = CIRCPAD_STATE_END;
}
/** Create a client-side padding machine that aims to hide rendezvous
* circuits.*/
void
@ -360,8 +340,22 @@ circpad_machine_client_hide_rend_circuits(smartlist_t *machines_sl)
client_machine->allowed_padding_count = 1;
client_machine->max_padding_percent = 1;
/* Setup states and histograms */
setup_state_machine_for_hiding_rend_circuits(client_machine);
/* Two states: START, OBFUSCATE_CIRC_SETUP (and END) */
circpad_machine_states_init(client_machine, 2);
/* START -> OBFUSCATE_CIRC_SETUP transition upon sending the first
* non-padding cell (which is PADDING_NEGOTIATE) */
client_machine->states[CIRCPAD_STATE_START].
next_state[CIRCPAD_EVENT_NONPADDING_SENT] =
CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP;
/* OBFUSCATE_CIRC_SETUP -> END transition when we send our first
* padding packet and/or hit the state length (the state length is 1). */
client_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_PADDING_RECV] = CIRCPAD_STATE_END;
client_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_LENGTH_COUNT] = CIRCPAD_STATE_END;
setup_obf_state_for_hiding_rend_circuits(
&client_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP]);
@ -398,8 +392,22 @@ circpad_machine_relay_hide_rend_circuits(smartlist_t *machines_sl)
relay_machine->allowed_padding_count = 1;
relay_machine->max_padding_percent = 1;
/* Setup states and histograms */
setup_state_machine_for_hiding_rend_circuits(relay_machine);
/* Two states: START, OBFUSCATE_CIRC_SETUP (and END) */
circpad_machine_states_init(relay_machine, 2);
/* START -> OBFUSCATE_CIRC_SETUP transition upon sending the first
* non-padding cell (which is PADDING_NEGOTIATED) */
relay_machine->states[CIRCPAD_STATE_START].
next_state[CIRCPAD_EVENT_NONPADDING_SENT] =
CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP;
/* OBFUSCATE_CIRC_SETUP -> END transition when we send our first
* padding packet and/or hit the state length (the state length is 1). */
relay_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_PADDING_RECV] = CIRCPAD_STATE_END;
relay_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP].
next_state[CIRCPAD_EVENT_LENGTH_COUNT] = CIRCPAD_STATE_END;
setup_obf_state_for_hiding_rend_circuits(
&relay_machine->states[CIRCPAD_STATE_OBFUSCATE_CIRC_SETUP]);