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# GDB macros for use with Quagga.
#
# Macros in this file are not daemon specific. E.g., OS or FRR library
# APIs.
#
# The macro file can be loaded with 'source <filename>'. They can then be
# called by the user. Macros that explore more complicated structs generally
# take pointer arguments.
#
# E.g.:
#
# (gdb) source ~paul/code/frr/gdb/lib.txt
# (gdb) break bgp_packet.c:613
# Breakpoint 3 at 0x7fa883033a32: file bgp_packet.c, line 613.
# (gdb) cont
# ...
# (gdb) cont
# Breakpoint 3, bgp_write_packet (peer=0x7fa885199080) at bgp_packet.c:614
# 614 if (CHECK_FLAG (adv->path->peer->cap,PEER_CAP_RESTART_RCV)
# (gdb) dump_prefix4 &adv->rn->p
# IPv4:10.1.1.0/24
# (gdb) dump_prefix &adv->rn->p
# IPv4:10.1.1.0/24
#
define def_ntohs
set $data = (char *)$arg0
set $i = 0
set $_ = $data[$i++] << 8
set $_ += $data[$i++]
end
document def_ntohs
Read a 2-byte short at the given pointed to area as big-endian and
return it in $_
Argument: Pointer to a 2-byte, big-endian short word.
Returns: Integer value of that word in $_
end
define def_ntohl
set $data = (char *)$arg0
set $i = 0
set $_ = $data[$i++] << 24
set $_ += $data[$i++] << 16
set $_ += $data[$i++] << 8
set $_ += $data[$i++]
end
document def_ntohl
Read a 4-byte integer at the given pointed to area as big-endian and
return it in $_
Argument: Pointer to a big-endian 4-byte word.
Returns: Integer value of that word in $_
end
# NB: This is in more complicated iterative form, rather than more
# conventional and simpler recursive form, because GDB has a recursion limit
# on macro calls (I think).
define walk_route_table_next
# callee saves
set $_top = $top
set $_node = $node
set $_prevl = $prevl
set $top = (struct route_node *)$arg0
set $node = (struct route_node *)$arg1
set $prevl = $node
# first try left
#echo try left\n
set $node = $prevl->link[0]
# otherwise try right
if ($node == 0)
#echo left null, try right\n
set $node = $prevl->link[1]
end
# otherwise go up, till we find the first right that
# we havn't been to yet
if ($node == 0)
set $node = $prevl
while ($node != $top)
#echo right null, try up and right\n
set $prevl = $node
set $parent = $node->parent
set $node = $parent->link[1]
if ($node != 0 && $node != $prevl)
#echo found node \n
loop_break
end
#echo go up\n
set $node = $parent
end
end
#printf "next node: 0x%x\n", $node
set $_ = $node
set $top = $_top
set $node = $_node
set $prevl = $_prevl
end
document walk_route_table_next
Return the next node to visit in the given route_table (or subset of) and
the given current node.
Arguments:
1st: (struct route_node *) to the top of the route_table to walk
2nd: (struct route_node *) to the current node
Returns: The (struct route_node *) for the next to visit in $_
end
define walk_route_table
set $_visited = $visited
set $_node = $node
set $top = $_top
set $node = (struct route_node *)$arg0
set $top = (struct route_node *)$arg0
set $visited = 0
while ($node != 0)
printf "Node: 0x%x", $node
if ($node->info != 0)
printf "\tinfo: 0x%x", $node->info
set $visited = $visited + 1
end
printf "\n"
walk_route_table_next $top $node
set $node = $_
# we've gotten back to the top, finish
if ($node == $top)
set $node = 0
end
end
printf "Visited: %u\n", $visited
set $top = $_top
set $visited = $_visited
set $node = $_node
end
document walk_route_table
Walk through a routing table (or subset thereof) and dump all the non-null
(struct route_node *)->info pointers.
Argument: A lib/thread.h::(struct route_node *) pointing to the route_node
under which all data should be dumped
end
define dump_timeval
set $tv = (struct timeval *)$arg0
set $day = 3600*24
if $tv->tv_sec > $day
printf "%d days, ", $tv->tv_sec / $day
end
if $tv->tv_sec > 3600
printf "%dh", $tv->tv_sec / 3600
end
if ($tv->tv_sec % 3600) > 60
printf "%dm", ($tv->tv_sec % 3600) / 60
end
printf "%d", $tv->tv_sec % 3600 % 60
if $tv->tv_usec != 0
printf ".%06d", $tv->tv_usec
end
printf "s"
end
document dump_timeval
Human readable dump of a (struct timeval *) argument
end
define dump_s_addr
set $addr = (char *)$arg0
printf "%d.%d.%d.%d", $addr[0], $addr[1], $addr[2], $addr[3]
end
define dump_s6_addr
set $a6 = (char *)$arg0
set $field = 0
while ($field < 16)
set $i1 = $field++
set $i2 = $field++
printf "%x%x", $a6[$i1], $a6[$i2]
if ($field > 2 && ($field % 4 == 0))
printf ":"
end
end
end
document dump_s6_addr
Interpret the memory starting at given address as an IPv6 s6_addr and
print in human readable form.
end
define dump_prefix4
set $p = (struct prefix *) $arg0
echo IPv4:
dump_s_addr &($p->u.prefix4)
printf "/%d\n", $p->prefixlen
end
document dump_prefix4
Textual dump of a (struct prefix4 *) argument.
end
define dump_prefix6
set $p = (struct prefix *) $arg0
echo IPv6:
dump_s6_addr &($p->u.prefix6)
printf "/%d\n", $p->prefixlen
end
document dump_prefix6
Textual dump of a (struct prefix6 *) argument.
end
define dump_prefix
set $p = $arg0
if ($p->family == 2)
dump_prefix4 $p
end
if ($p->family == 10)
dump_prefix6 $p
end
end
document dump_prefix
Human readable dump of a (struct prefix *) argument.
end
define rn_next_down
set $node = $arg0
while ($node != 0)
print/x $node
if ($node->link[0] != 0)
set $node = $node->link[0]
else
set $node = $node->link[1]
end
end
end
document rn_next_down
Walk left-down a given route table, dumping locations of route_nodes
Argument: A single (struct route_node *).
end
define rn_next_up
set $top = (struct route_node *)$arg0
set $node = (struct route_node *)$arg1
while ($node != $top)
echo walk up\n
set $prevl = $node
set $parent = $node->parent
set $node = $parent->link[1]
if ($node != 0 && $node != $prevl)
echo found a node\n
loop_break
end
echo going up\n
set $node = $parent
end
output/x $node
echo \n
end
document rn_next_up
Walk up-and-right from the given route_node to the next valid route_node
which is not the given "top" route_node
Arguments:
1st: A (struct route_node *) to the top of the route table.
2nd: The (struct route_node *) to walk up from
end
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