1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
__mitmproxy__ has a powerful scripting API that allows you to modify flows
on-the-fly or rewrite previously saved flows locally.
The mitmproxy scripting API is event driven - a script is simply a Python
module that exposes a set of event methods. Here's a complete mitmproxy script
that adds a new header to every HTTP response before it is returned to the
client:
$!example("examples/add_header.py")!$
The first argument to each event method is an instance of ScriptContext that
lets the script interact with the global mitmproxy state. The __response__
event also gets an instance of Flow, which we can use to manipulate the
response itself.
## Events
### start(ScriptContext)
Called once on startup, before any other events.
###clientconnect(ScriptContext, ClientConnect)
Called when a client initiates a connection to the proxy. Note that
a connection can correspond to multiple HTTP requests.
###request(ScriptContext, Flow)
Called when a client request has been received. The __Flow__ object is
guaranteed to have a non-None __request__ attribute.
### response(ScriptContext, Flow)
Called when a server response has been received. The __Flow__ object is
guaranteed to have non-None __request__ and __response__ attributes.
### error(ScriptContext, Flow)
Called when a flow error has occurred, e.g. invalid server responses, or
interrupted connections. This is distinct from a valid server HTTP error
response, which is simply a response with an HTTP error code. The __Flow__
object is guaranteed to have non-None __request__ and __error__ attributes.
### clientdisconnect(ScriptContext, ClientDisconnect)
Called when a client disconnects from the proxy.
### done(ScriptContext)
Called once on script shutdown, after any other events.
## API
The main classes you will deal with in writing mitmproxy scripts are:
<table class="kvtable">
<tr>
<th>libmproxy.flow.ClientConnection</th>
<td>Describes a client connection.</td>
</tr>
<tr>
<th>libmproxy.flow.ClientDisconnection</th>
<td>Describes a client disconnection.</td>
</tr>
<tr>
<th>libmproxy.flow.Error</th>
<td>A communications error.</td>
</tr>
<tr>
<th>libmproxy.flow.Flow</th>
<td>A collection of objects representing a single HTTP transaction.</td>
</tr>
<tr>
<th>libmproxy.flow.Headers</th>
<td>HTTP headers for a request or response.</td>
</tr>
<tr>
<th>libmproxy.flow.ODict</th>
<td>A dictionary-like object for managing sets of key/value data. There
is also a variant called CaselessODict that ignores key case for some
calls (used mainly for headers).</td>
</tr>
<tr>
<th>libmproxy.flow.Response</th>
<td>An HTTP response.</td>
</tr>
<tr>
<th>libmproxy.flow.Request</th>
<td>An HTTP request.</td>
</tr>
<tr>
<th>libmproxy.flow.ScriptContext</th>
<td> A handle for interacting with mitmproxy's from within scripts. </td>
</tr>
<tr>
<th>libmproxy.certutils.SSLCert</th>
<td>Exposes information SSL certificates.</td>
</tr>
</table>
The canonical API documentation is the code. You can view the API documentation
using pydoc (which is installed with Python by default), like this:
<pre class="terminal">
> pydoc libmproxy.flow.Request
</pre>
## Running scripts on saved flows
Sometimes, we want to run a script on __Flow__ objects that are already
complete. This happens when you start a script, and then load a saved set of
flows from a file (see the "scripted data transformation" example on the
[mitmdump](@!urlTo("mitmdump.html")!@) page). It also happens when you run a
one-shot script on a single flow through the _|_ (pipe) shortcut in mitmproxy.
In this case, there are no client connections, and the events are run in the
following order: __start__, __request__, __response__, __error__, __done__. If
the flow doesn't have a __response__ or __error__ associated with it, the
matching event will be skipped.
|
