Skip to content

Clean up AGWPE connection data upon termination #600

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: dev
Choose a base branch
from
+144 −64
Open

Clean up AGWPE connection data upon termination #600

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
208 changes: 144 additions & 64 deletions src/ax25_link.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2016, 2017, 2018, 2023, 2024 John Langner, WB2OSZ
// Copyright (C) 2016, 2017, 2018, 2023, 2024, 2025 John Langner, WB2OSZ
//
// 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
Expand Down Expand Up @@ -599,6 +599,8 @@ static int AX25MODULO(int n, int m, const char *file, const char *func, int line
// TODO: add SELECT_T1_VALUE for debugging.


static void dl_connection_cleanup (ax25_dlsm_t *S);
static void dl_connection_terminated (ax25_dlsm_t *S);
static void dl_data_indication (ax25_dlsm_t *S, int pid, char *data, int len);

static void i_frame (ax25_dlsm_t *S, cmdres_t cr, int p, int nr, int ns, int pid, char *info_ptr, int info_len);
Expand Down Expand Up @@ -1101,6 +1103,7 @@ void dl_disconnect_request (dlq_item_t *E)
text_color_set(DW_COLOR_INFO);
dw_printf ("Stream %d: Disconnected from %s.\n", S->stream_id, S->addrs[PEERCALL]);
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
dl_connection_terminated (S);
break;

case state_1_awaiting_connection:
Expand Down Expand Up @@ -1129,6 +1132,7 @@ void dl_disconnect_request (dlq_item_t *E)
STOP_T3; // probably don't need.
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
dl_connection_terminated (S);
break;

case state_2_awaiting_release:
Expand Down Expand Up @@ -1159,6 +1163,7 @@ void dl_disconnect_request (dlq_item_t *E)

STOP_T1;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
break;

Expand Down Expand Up @@ -1742,6 +1747,133 @@ void dl_outstanding_frames_request (dlq_item_t *E)



/*------------------------------------------------------------------------------
*
* Name: dl_connection_cleanup
*
* Purpose: Clean out a specific state machine and its references, freeing
* associated memory.
*
* Inputs: S - Data Link State Machine.
*
* Description: Clean out a specific state machine and anything related to it.
* Free the associated memory.
*
*------------------------------------------------------------------------------*/

static void dl_connection_cleanup (ax25_dlsm_t *S)
{
int n;

if (s_debug_stats) {
text_color_set(DW_COLOR_INFO);
dw_printf ("%d I frames received\n", S->count_recv_frame_type[frame_type_I]);

dw_printf ("%d RR frames received\n", S->count_recv_frame_type[frame_type_S_RR]);
dw_printf ("%d RNR frames received\n", S->count_recv_frame_type[frame_type_S_RNR]);
dw_printf ("%d REJ frames received\n", S->count_recv_frame_type[frame_type_S_REJ]);
dw_printf ("%d SREJ frames received\n", S->count_recv_frame_type[frame_type_S_SREJ]);

dw_printf ("%d SABME frames received\n", S->count_recv_frame_type[frame_type_U_SABME]);
dw_printf ("%d SABM frames received\n", S->count_recv_frame_type[frame_type_U_SABM]);
dw_printf ("%d DISC frames received\n", S->count_recv_frame_type[frame_type_U_DISC]);
dw_printf ("%d DM frames received\n", S->count_recv_frame_type[frame_type_U_DM]);
dw_printf ("%d UA frames received\n", S->count_recv_frame_type[frame_type_U_UA]);
dw_printf ("%d FRMR frames received\n", S->count_recv_frame_type[frame_type_U_FRMR]);
dw_printf ("%d UI frames received\n", S->count_recv_frame_type[frame_type_U_UI]);
dw_printf ("%d XID frames received\n", S->count_recv_frame_type[frame_type_U_XID]);
dw_printf ("%d TEST frames received\n", S->count_recv_frame_type[frame_type_U_TEST]);

dw_printf ("%d peak retry count\n", S->peak_rc_value);
}

if (s_debug_client_app) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("dl_connection_cleanup: remove %s>%s\n", S->addrs[AX25_SOURCE], S->addrs[AX25_DESTINATION]);
}

discard_i_queue (S);

for (n = 0; n < 128; n++) {
if (S->txdata_by_ns[n] != NULL) {
cdata_delete (S->txdata_by_ns[n]);
S->txdata_by_ns[n] = NULL;
}
}

for (n = 0; n < 128; n++) {
if (S->rxdata_by_ns[n] != NULL) {
cdata_delete (S->rxdata_by_ns[n]);
S->rxdata_by_ns[n] = NULL;
}
}

if (S->ra_buff != NULL) {
cdata_delete (S->ra_buff);
S->ra_buff = NULL;
}

// Put into disconnected state.
// If "connected" indicator (e.g. LED) was on, this will turn it off.

enter_new_state (S, state_0_disconnected, __func__, __LINE__);

S->magic1 = 0;
S->magic2 = 0;
S->magic3 = 0;

free (S);

} /* end dl_connection_cleanup */



/*------------------------------------------------------------------------------
*
* Name: dl_connection_terminated
*
* Purpose: Connection has gone away. Clean up any data associated with it.
*
* Inputs: S - Data Link State Machine.
*
* Description: Clean out anything related to the specified connection, and
* remove the associated state machine from the list.
*
*------------------------------------------------------------------------------*/

static void dl_connection_terminated (ax25_dlsm_t *S)
{
ax25_dlsm_t *dlentry;
ax25_dlsm_t *dlprev;

// Look for corruption or double freeing.

assert (S->magic1 == MAGIC1);
assert (S->magic2 == MAGIC2);
assert (S->magic3 == MAGIC3);

// Remove from the list.

dlprev = NULL;
dlentry = list_head;
while (dlentry != S) {
dlprev = dlentry;
dlentry = dlentry->next;
}
if (!dlprev) {
list_head = dlentry->next;
} else {
dlprev->next = dlentry->next;
}

// Clean up the connection.

dl_connection_cleanup(S);

} /* end dl_connection_terminated */



/*------------------------------------------------------------------------------
*
* Name: dl_client_cleanup
Expand Down Expand Up @@ -1785,76 +1917,15 @@ void dl_client_cleanup (dlq_item_t *E)

if (S->client == E->client ) {

int n;

if (s_debug_stats) {
text_color_set(DW_COLOR_INFO);
dw_printf ("%d I frames received\n", S->count_recv_frame_type[frame_type_I]);

dw_printf ("%d RR frames received\n", S->count_recv_frame_type[frame_type_S_RR]);
dw_printf ("%d RNR frames received\n", S->count_recv_frame_type[frame_type_S_RNR]);
dw_printf ("%d REJ frames received\n", S->count_recv_frame_type[frame_type_S_REJ]);
dw_printf ("%d SREJ frames received\n", S->count_recv_frame_type[frame_type_S_SREJ]);

dw_printf ("%d SABME frames received\n", S->count_recv_frame_type[frame_type_U_SABME]);
dw_printf ("%d SABM frames received\n", S->count_recv_frame_type[frame_type_U_SABM]);
dw_printf ("%d DISC frames received\n", S->count_recv_frame_type[frame_type_U_DISC]);
dw_printf ("%d DM frames received\n", S->count_recv_frame_type[frame_type_U_DM]);
dw_printf ("%d UA frames received\n", S->count_recv_frame_type[frame_type_U_UA]);
dw_printf ("%d FRMR frames received\n", S->count_recv_frame_type[frame_type_U_FRMR]);
dw_printf ("%d UI frames received\n", S->count_recv_frame_type[frame_type_U_UI]);
dw_printf ("%d XID frames received\n", S->count_recv_frame_type[frame_type_U_XID]);
dw_printf ("%d TEST frames received\n", S->count_recv_frame_type[frame_type_U_TEST]);

dw_printf ("%d peak retry count\n", S->peak_rc_value);
}

if (s_debug_client_app) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("dl_client_cleanup: remove %s>%s\n", S->addrs[AX25_SOURCE], S->addrs[AX25_DESTINATION]);
}

discard_i_queue (S);

for (n = 0; n < 128; n++) {
if (S->txdata_by_ns[n] != NULL) {
cdata_delete (S->txdata_by_ns[n]);
S->txdata_by_ns[n] = NULL;
}
}

for (n = 0; n < 128; n++) {
if (S->rxdata_by_ns[n] != NULL) {
cdata_delete (S->rxdata_by_ns[n]);
S->rxdata_by_ns[n] = NULL;
}
}

if (S->ra_buff != NULL) {
cdata_delete (S->ra_buff);
S->ra_buff = NULL;
}

// Put into disconnected state.
// If "connected" indicator (e.g. LED) was on, this will turn it off.

enter_new_state (S, state_0_disconnected, __func__, __LINE__);

// Take S out of list.

S->magic1 = 0;
S->magic2 = 0;
S->magic3 = 0;

if (S == list_head) { // first one on list.

list_head = S->next;
free (S);
dl_connection_cleanup (S);
S = list_head;
}
else { // not the first one.
dlprev->next = S->next;
free (S);
dl_connection_cleanup (S);
S = dlprev->next;
}
}
Expand Down Expand Up @@ -4504,6 +4575,7 @@ static void disc_frame (ax25_dlsm_t *S, int p)
STOP_T1;
STOP_T3;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
break;
}
Expand Down Expand Up @@ -4591,6 +4663,7 @@ static void dm_frame (ax25_dlsm_t *S, int f)
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
STOP_T1;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
// keep current state.
Expand All @@ -4613,6 +4686,7 @@ static void dm_frame (ax25_dlsm_t *S, int f)
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
STOP_T1;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
// keep current state.
Expand All @@ -4634,6 +4708,7 @@ static void dm_frame (ax25_dlsm_t *S, int f)
STOP_T1;
STOP_T3;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
break;

case state_5_awaiting_v22_connection:
Expand All @@ -4651,6 +4726,7 @@ static void dm_frame (ax25_dlsm_t *S, int f)
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
STOP_T1;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
// keep current state.
Expand Down Expand Up @@ -4858,6 +4934,7 @@ static void ua_frame (ax25_dlsm_t *S, int f)
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
STOP_T1;
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
if (s_debug_protocol_errors) {
Expand Down Expand Up @@ -5374,6 +5451,7 @@ static void t1_expiry (ax25_dlsm_t *S)
dw_printf ("Failed to connect to %s after %d tries.\n", S->addrs[PEERCALL], S->n2_retry);
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 1);
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
cmdres_t cmd = cr_cmd;
Expand All @@ -5400,6 +5478,7 @@ static void t1_expiry (ax25_dlsm_t *S)
dw_printf ("Stream %d: Disconnected from %s.\n", S->stream_id, S->addrs[PEERCALL]);
server_link_terminated (S->chan, S->client, S->addrs[PEERCALL], S->addrs[OWNCALL], 0);
enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
cmdres_t cmd = cr_cmd;
Expand Down Expand Up @@ -5473,6 +5552,7 @@ static void t1_expiry (ax25_dlsm_t *S)
lm_data_request (S->chan, TQ_PRIO_1_LO, pp);

enter_new_state (S, state_0_disconnected, __func__, __LINE__);
dl_connection_terminated (S);
}
else {
SET_RC(S->rc+1);
Expand Down
Loading