tor-commits February 2019

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1788 discussions

[sbws/master] Merge branch 'bug29149_squashed'
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit 09ea0377ba1b6ed7892aec777640729f494afce8 Merge: 2a08a7b 0fb0128 Author: juga0 <juga(a)riseup.net> Date: Sat Feb 23 10:55:43 2019 +0000 Merge branch 'bug29149_squashed' Solved conflicts: docs/source/specification.rst INSTALL.rst | 2 +- README.md | 2 +- docs/source/activity_all.puml | 25 + docs/source/activity_second_relay.puml | 30 + docs/source/bandwidth_authorities.rst | 28 + docs/source/bandwidth_distribution.rst | 38 + docs/source/classes_original.puml | 220 +++ docs/source/code_design.rst | 60 + docs/source/conf.py | 5 +- docs/source/config.rst | 8 +- docs/source/config_tor.rst | 41 +- docs/source/data/critical_sections.dia | Bin 0 -> 3540 bytes docs/source/data/scanner.dia | Bin 0 -> 1997 bytes docs/source/data/use_cases_data_sources.dia | Bin 0 -> 1743 bytes docs/source/diagrams.rst | 16 - docs/source/documenting.rst | 4 +- docs/source/how_works.rst | 158 ++ docs/source/images/20180901_163442.png | Bin 0 -> 38517 bytes docs/source/images/20180901_164014.png | Bin 0 -> 43522 bytes ...710932-ac1eeea8-9960-11e8-9e7e-21fddff2f7a3.png | Bin 0 -> 38367 bytes ...710933-ac95e0bc-9960-11e8-9aaf-0bb1f83b65e2.png | Bin 0 -> 33525 bytes docs/source/images/activity_all.svg | 1 + docs/source/images/activity_second_relay.svg | 1 + docs/source/images/advertised_bandwidth.png | Bin 0 -> 58213 bytes docs/source/images/bwauth.svg | 1570 ++++++++++++++++++++ docs/source/images/bwauth_measured_7days.png | Bin 0 -> 28457 bytes docs/source/images/bwauth_measured_90days.png | Bin 0 -> 52889 bytes docs/source/images/classes_original.svg | 1 + docs/source/images/classes_sbws.svg | 246 --- docs/source/images/critical_sections.svg | 516 +++++++ docs/source/images/pycallgraph.png | Bin 0 -> 381993 bytes docs/source/images/scanner.svg | 248 ++++ docs/source/images/threads.svg | 1 + docs/source/images/torperf.png | Bin 0 -> 99045 bytes docs/source/images/totalcw.png | Bin 0 -> 81651 bytes docs/source/images/use_cases_classes.svg | 401 +++++ docs/source/images/use_cases_data_sources.svg | 291 ++++ docs/source/index.rst | 16 +- docs/source/monitoring_bandwidth.rst | 35 + docs/source/sbws.rst | 2 +- docs/source/specification.rst | 167 --- docs/source/state.rst | 2 + docs/source/threads.puml | 23 + docs/source/tor_bandwidth_files.rst | 32 + sbws/core/scanner.py | 7 + 45 files changed, 3741 insertions(+), 456 deletions(-)

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[sbws/master] docs: add which Tor version is recommended
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit 07d36738cadf6c35b25420408a51ab1f6ce750ed Author: juga0 <juga(a)riseup.net> Date: Wed Jan 23 15:10:44 2019 +0000 docs: add which Tor version is recommended --- INSTALL.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/INSTALL.rst b/INSTALL.rst index bb41e6b..2cc2a10 100644 --- a/INSTALL.rst +++ b/INSTALL.rst @@ -19,7 +19,7 @@ Continue reading to install ``sbws`` in other ways. System requirements -------------------- -- Tor +- Tor (last stable version is recommended) - Python 3 (>= 3.5) - virtualenv_ (while there is not ``stem`` release > 1.6.0, it is recommended to install the required python dependencies in a virtualenv)

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[sbws/master] docs: remove section already in INSTALL
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit bc6ba301f09e9e14037dd7806a2e10e9904b0dfe Author: juga0 <juga(a)riseup.net> Date: Wed Jan 23 15:11:43 2019 +0000 docs: remove section already in INSTALL --- docs/source/specification.rst | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/docs/source/specification.rst b/docs/source/specification.rst index f35f517..598465f 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -78,17 +78,6 @@ ever measured within the validity period into a single file for the tor process the bandwidth authority is running to read. The bandwidth authority includes these aggregated results in its votes. -Sbws dependencies ------------------ - -Sbws scanners run tor for themselves and do not require a system tor process to -exist. Tor MUST be installed, and it SHOULD be any up-to-date version supported -by the network team. - -Sbws uses the python library Stem_ to launch and control tor and the python -library Requests_ to make HTTP(S) requests. Both are generally packaged for -most major Linux distributions, and are always available in PyPI. - How it all works ----------------

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[sbws/master] docs: remove prioritization section
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit 11458e883bef296ec3a8f89e9d3d59bb758fbed9 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 10:27:34 2019 +0000 docs: remove prioritization section since it's already explained in the previous paragraph. --- docs/source/specification.rst | 46 ------------------------------------------- 1 file changed, 46 deletions(-) diff --git a/docs/source/specification.rst b/docs/source/specification.rst index 4ad474c..83c7467 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -116,52 +116,6 @@ Classes used in the initialization: Source code: :func:`sbws.core.scanner.run_speedtest` -Simple relay prioritization -~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -This may be the most complex part of sbws. - -Sbws makes an effort to prioritize measurements of relays that don't have many -recent results. For example: relays that just joined the Tor network or relays -that haven't been online in the past few days. This goal is achieved using a -min-priority queue and the concept of *freshness*. - -Freshness is defined as the amount of time between when the measurement was -made and the time sbws will stop considering it valid. Thus, a measurement made -more recently will have more time until it is no longer valid (higher -freshness) and a measurement made a long time ago will have very little time -until it is no longer valid (lower freshness). - -Over time, sbws will make many measurements for a given relay. The sum of these -measurements' freshnesses is the relay's priority. As we are prioritizing like -a min-priority queue, a higher sum of freshnesses means *worse* priority while -a lower sum of freshnesses means *better* priority. - - Example: AlphaRelay33 joined the network yesterday and sbws has measured it - once so far. BetaRelay87 has been in the network for years and has been - getting measured regularly approximately once a day. BetaRelay87 has five - measurements that are still valid, with freshnesses 10, 100, 500, 1000, and - 1500. AlphaRelay33's one measurement has freshness 3000. Because the sum of - BetaRelay87's 5 measurements is greater than AlphaRelay33's one measurement, - AlphaRelay33 has *better* priority and will be measured next before - BetaRelay87. - - Example: AlphaRelay33 is still a brand new relay with its one measurement - in the last day with freshness 3000. CharlieRelay9 has been in the network - for a long time, but had technical issues last week and hasn't been online in - many days. When CharlieRelay9's operator finally gets him back online, he - still has one valid measurement with freshness 10. Because AlphaRelay33's - measurement is fresher, CharlieRelay9 has *better* priority and will get - measured first. - -Sometimes measurements fail. Hopefully they fail because of transient issues, -and with that hope in mind, it would be nice if a relay with a failed -measurement didn't have to wait a long time to have another chance at a -successful measurement. For this reason, when summing the freshnesses of -results for a given relay, sbws will artificially *reduce* the freshness for -measurements that were not successful. This makes the sum of freshnesses lower -for that relay, and therefore the priority *better* so it can be measured again -sooner. Simple result storage ~~~~~~~~~~~~~~~~~~~~~

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[sbws/master] docs: explain how sbws is initialized
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit ad9b53e831dfe2b945a21e282cd63bc858dd1153 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 10:24:31 2019 +0000 docs: explain how sbws is initialized --- docs/source/data/scanner.dia | Bin 0 -> 1997 bytes docs/source/data/use_cases_data_sources.dia | Bin 0 -> 1743 bytes docs/source/images/scanner.svg | 248 ++++++++++++++++ docs/source/images/use_cases_classes.svg | 401 ++++++++++++++++++++++++++ docs/source/images/use_cases_data_sources.svg | 291 +++++++++++++++++++ docs/source/specification.rst | 49 +++- 6 files changed, 985 insertions(+), 4 deletions(-) diff --git a/docs/source/data/scanner.dia b/docs/source/data/scanner.dia new file mode 100644 index 0000000..16bc840 Binary files /dev/null and b/docs/source/data/scanner.dia differ diff --git a/docs/source/data/use_cases_data_sources.dia b/docs/source/data/use_cases_data_sources.dia new file mode 100644 index 0000000..b111ab8 Binary files /dev/null and b/docs/source/data/use_cases_data_sources.dia differ diff --git 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+++ b/docs/source/specification.rst @@ -70,10 +70,51 @@ ever measured within the validity period into a single file for the tor process the bandwidth authority is running to read. The bandwidth authority includes these aggregated results in its votes. -How it all works ----------------- - -We now describe various core parts of sbws. +Running the scanner +--------------------- +Overview +~~~~~~~~~ + +The :term:`scanner` obtain a list of relays from the Tor network. +It measures the bandwidth of each relay by creating a two hop circuit with the +relay to measure and download data from a :term:`destination` Web Server. +The :term:`generator` creates a :term:`bandwidth list file` that is read +by a :term:`directory authority` and used to report relays' bandwidth in its +vote. + +.. image:: ./images/scanner.svg + :height: 200px + :align: center + +Intialization +~~~~~~~~~~~~~~ + +.. At some point it should be able to get environment variables + +#. Parse the command line arguments and configuration files. +#. Launch a Tor thread with an specific configuration or connect to a running + Tor daemon that is running with a suitable configuration. +#. Obtain the list of relays in the Tor network from the Tor consensus and + descriptor documents. +#. Read and parse the old bandwidth measurements stored in the file system. +#. Select a subset of the relays to be measured next, ordered by: + + #. relays not measured. + #. measurements age. + +.. image:: ./images/use_cases_data_sources.svg + :alt: data sources + :height: 200px + :align: center + +Classes used in the initialization: + +.. image:: ./images/use_cases_classes.svg + :alt: classes initializing data + :height: 300px + :align: center + +Source code: :func:`sbws.core.scanner.run_speedtest` Simple relay prioritization ~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 0

[sbws/master] docs: remove section that is already in DEPLOY
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit a030102c3181bd4276ac0e9ca829521379195768 Author: juga0 <juga(a)riseup.net> Date: Wed Jan 23 16:40:14 2019 +0000 docs: remove section that is already in DEPLOY --- docs/source/specification.rst | 8 -------- 1 file changed, 8 deletions(-) diff --git a/docs/source/specification.rst b/docs/source/specification.rst index 598465f..ee99f3d 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -52,14 +52,6 @@ This document describes the implementation contained within the accompanying Anatomy of a Tor network using sbws ----------------------------------- -First and foremost, there needs to be one or more webservers that exist -somewhere on the Internet. They MUST serve up a file of at least some minimum -size, and MUST support both HTTP GET and HEAD requests on that file. For both -HTTP verbs, they MUST support requests with the Range header and MUST support -*not* compressing responses. Beyond these requirements, the webservers MAY support -TLS connections, optionally with a valid certificate. Both apache and nginx fit -these requirements. - Every directory authority that wishes to also vote on relay bandwidth (AKA a bandwidth authority) MUST run one or more sbws scanner clients (or trust someone to run one or more sbws scanner clients for them). The scanners run

1 0

[sbws/master] docs: explain how the second relay is selected
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit c5223ae0756489c6c84da6a60465cbab60094ad9 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 10:52:36 2019 +0000 docs: explain how the second relay is selected --- docs/source/activity_second_relay.puml | 30 ++++++++++++++++++++++++++++ docs/source/images/activity_second_relay.svg | 1 + docs/source/specification.rst | 18 +++++++++++++++++ 3 files changed, 49 insertions(+) diff --git a/docs/source/activity_second_relay.puml b/docs/source/activity_second_relay.puml new file mode 100644 index 0000000..d088d68 --- /dev/null +++ b/docs/source/activity_second_relay.puml @@ -0,0 +1,30 @@ +@startuml + +start + +if (relay to measure is exit?) then (yes) + :obtain non-exits; +else (no) + :obtain an exits + without bad flag + that can exit + to port 443; +endif +:potential second relays; +:obtain a relay +from potential +sencond relays +randomly; +if (second relay has 2x bandwidth?) then (yes) +elseif (other second relay has 1.5x bandwidth?) then (yes) +elseif (other second relay has 1x bandwidth?) then (yes) +else (nothing) + stop +endif +:second relay selected!; +:Build a circuit +whith exit as +second hop; +stop + +@enduml \ No newline at end of file diff --git a/docs/source/images/activity_second_relay.svg b/docs/source/images/activity_second_relay.svg new file mode 100644 index 0000000..a996c1e --- /dev/null +++ b/docs/source/images/activity_second_relay.svg @@ -0,0 +1 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="625px" preserveAspectRatio="none" style="width:812px;height:625px;" version="1.1" viewBox="0 0 812 625" width="812px" zoomAndPan="magnify"><defs><filter height="300%" id="fd9ikek" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><ellipse cx="415" cy="20" fill="#000000" filter="url(#fd9ikek)" rx="10" ry="10" style="stroke: none; stroke-width: 1.0;"/><polygon fill="#FEFECE" filter="url(#fd9ikek)" points="344,50,486,50,498,62,486,74,344,74,332,62,344,50" style="stroke: #A80036; stroke-width: 1.5;"/> <text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="142" x="344" y="65.8081">relay to measure is exit?</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="20" x="312" y="59.4058">yes</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="14" x="498" y="59.4058">no</text><rect fill="#FEFECE" filter="url(#fd9ikek)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="121" x="261.5" y="84"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="101" x="271.5" y="105.1387">obtain non-exits</text><rect fill="#FEFECE" filter="url(#fd9ikek)" height="75.875" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.5;"/><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="20" x="377" y="393.9292">yes</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="228" x="259" y="375.5269">other second relay has 1.5x bandwidth?</text><polygon fill="#FEFECE" filter="url(#fd9ikek)" points="531,359.7188,748,359.7188,760,371.7188,748,383.7188,531,383.7188,519,371.7188,531,359.7188" style="stroke: #A80036; stroke-width: 1.5;"/><text fill="#000000" font -family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="20" x="643.5" y="393.9292">yes</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="217" x="531" y="375.5269">other second relay has 1x bandwidth?</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="42" x="760" y="369.1245">nothing</text><ellipse cx="795" cy="413.1211" fill="none" filter="url(#fd9ikek)" rx="10" ry="10" style="stroke: #000000; stroke-width: 1.0;"/><ellipse cx="795.5" cy="413.6211" fill="#000000" filter="url(#fd9ikek)" rx="6" ry="6" style="stroke: none; stroke-width: 1.0;"/><rect fill="#FEFECE" filter="url(#fd9ikek)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="163" x="333.5" y="463.1211"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="143" x="343.5" y="484.2598">second relay selected!</text><rect fill="#FEFECE" filter="url(#fd9ikek)" height="61.9063" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="104" x="363" y="517.0898"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="84" x="373" y="538.2285">Build a circuit</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="78" x="373" y="552.1973">whith exit as</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="74" x="373" y="566.166">second hop</text><ellipse cx="415" cy="608.9961" fill="none" filter="url(#fd9ikek)" rx="10" ry="10" style="stroke: #000000; 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stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="415" x2="415" y1="578.9961" y2="598.9961"/><polygon fill="#A80036" points="411,588.9961,415,598.9961,419,588.9961,415,592.9961" style="stroke: #A80036; stroke-width: 1.0;"/></g></svg> \ No newline at end of file diff --git a/docs/source/specification.rst b/docs/source/specification.rst index 1e5b683..56bd8b1 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -132,6 +132,24 @@ Measuring relays Source code: :func:`sbws.core.scanner.measure_relay` +Selecting a second relay +~~~~~~~~~~~~~~~~~~~~~~~~ + +#. If the relay to measure is an exit, use it as an exit and obtain the + non-exits. +#. If the relay to measure is not an exit, use it as first hop and obtain + the exits. +#. From non-exits or exits, select one randomly from the ones that have + double consensus bandwidth than the relay to measure. +#. If there are no relays that satisfy this, lower the required bandwidth. + +.. image:: ./images/activity_second_relay.svg + :alt: activity select second relay + :height: 400px + :align: center + +Source code: :func:`sbws.core.scanner.measure_relay` + Simple result storage ~~~~~~~~~~~~~~~~~~~~~

1 0

[sbws/master] docs: remove page metadata
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit 85febc22a84c2aa6cf06dd8ccb660664ff5c99f3 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 12:31:09 2019 +0000 docs: remove page metadata --- docs/source/specification.rst | 8 -------- 1 file changed, 8 deletions(-) diff --git a/docs/source/specification.rst b/docs/source/specification.rst index d48f4e2..4e5f083 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -1,14 +1,6 @@ Simple Bandwidth Scanner technical details ============================================ -:Author: Matt Traudt, juga -:Date: 29 March 2018 -:Last Update: 19 Sep 2018 -:Status: Draft - -.. note:: this document may become an specification of the ``sbws`` method to - measure relays and/or scale the measuremensts - Conventions -----------

1 0

[sbws/master] docs: remove RFC key words
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit dea9a380198e271fd7f0028a9a031ddb4c1de892 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 12:31:30 2019 +0000 docs: remove RFC key words since the page is not an specification in RFC terms. --- docs/source/specification.rst | 9 --------- 1 file changed, 9 deletions(-) diff --git a/docs/source/specification.rst b/docs/source/specification.rst index 4e5f083..7c5dc1e 100644 --- a/docs/source/specification.rst +++ b/docs/source/specification.rst @@ -1,15 +1,6 @@ Simple Bandwidth Scanner technical details ============================================ -Conventions ------------ - -The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", -"SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" -in this document are to be interpreted as described in BCP 14 (:rfc:`2119` -and :rfc:`8174`) when, and only when, they appear in all capitals, as shown -here. - Background ----------

1 0

[sbws/master] docs: explain how the relays are measured
by juga＠torproject.org 23 Feb '19

23 Feb '19

commit eb19c15d72f1a1afa1b917ecd93f2abfb4bc9ee9 Author: juga0 <juga(a)riseup.net> Date: Thu Feb 7 10:43:45 2019 +0000 docs: explain how the relays are measured --- docs/source/activity_all.puml | 25 +++++++++++++++++++++++++ docs/source/images/activity_all.svg | 1 + docs/source/specification.rst | 15 +++++++++++++++ 3 files changed, 41 insertions(+) diff --git a/docs/source/activity_all.puml b/docs/source/activity_all.puml new file mode 100644 index 0000000..225dd64 --- /dev/null +++ b/docs/source/activity_all.puml @@ -0,0 +1,25 @@ +@startuml + +start + +while (no SIGINT/SIGTERM?) + + while (next relay to measure?) + + :Select a destination; + + :Select a second relay; + + :Build a circuit; + + :HTTP GET (Range-Bytes); + + :Store measurement; + + endwhile + +endwhile + +stop + +@enduml \ No newline at end of file diff --git a/docs/source/images/activity_all.svg b/docs/source/images/activity_all.svg new file mode 100644 index 0000000..b97e56c --- /dev/null +++ b/docs/source/images/activity_all.svg @@ -0,0 +1 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="479px" preserveAspectRatio="none" style="width:256px;height:479px;" version="1.1" viewBox="0 0 256 479" width="256px" zoomAndPan="magnify"><defs><filter height="300%" id="f8gvh59" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><ellipse cx="145.5" cy="20" fill="#000000" filter="url(#f8gvh59)" rx="10" ry="10" style="stroke: none; 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For every relay: +#. Select a second relay to build a Tor circuit. +#. Build the circuit. +#. Make HTTPS GET requests to the Web server over the circuit. +#. Store the time the request took and the amount of bytes requested. + +.. image:: ./images/activity_all.svg + :alt: activity measuring relays + :height: 300px + :align: center + +Source code: :func:`sbws.core.scanner.measure_relay` Simple result storage ~~~~~~~~~~~~~~~~~~~~~

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tor-commits February 2019