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#!/usr/bin/env python3
import argparse
import boto3
BLOCKSIZE = 512 * 1024
IPXELOG_OFFSET = 16 * 1024
IPXELOG_MAGIC = b'iPXE LOG'
def create_snapshot(region, instance_id):
"""Create root volume snapshot"""
client = boto3.client('ec2', region_name=region)
resource = boto3.resource('ec2', region_name=region)
instance = resource.Instance(instance_id)
volumes = list(instance.volumes.all())
snapshot = volumes[0].create_snapshot()
snapshot.wait_until_completed()
return snapshot.id
def get_snapshot_block(region, snapshot_id, index):
"""Get block content from snapshot"""
client = boto3.client('ebs', region_name=region)
blocks = client.list_snapshot_blocks(SnapshotId=snapshot_id,
StartingBlockIndex=index)
token = blocks['Blocks'][0]['BlockToken']
block = client.get_snapshot_block(SnapshotId=snapshot_id,
BlockIndex=index,
BlockToken=token)
return block['BlockData'].read()
def get_block0_content(region, instance_id):
"""Get content of root volume block zero from instance"""
client = boto3.client('ec2', region_name=region)
resource = boto3.resource('ec2', region_name=region)
snapshot_id = create_snapshot(region, instance_id)
block = get_snapshot_block(region, snapshot_id, 0)
resource.Snapshot(snapshot_id).delete()
return block
def get_int13con_output(region, instance_id):
"""Get INT13 console output"""
block = get_block0_content(region, instance_id)
logpart = block[IPXELOG_OFFSET:]
magic = logpart[:len(IPXELOG_MAGIC)]
if magic != IPXELOG_MAGIC:
raise ValueError("Invalid log magic signature")
log = logpart[len(IPXELOG_MAGIC):].split(b'\0')[0]
return log.decode()
# Parse command-line arguments
parser = argparse.ArgumentParser(description="Get AWS INT13 console output")
parser.add_argument('--region', '-r', help="AWS region")
parser.add_argument('id', help="Instance ID")
args = parser.parse_args()
# Get console output from INT13CON partition
output = get_int13con_output(args.region, args.id)
# Print console output
print(output)
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