Re: [tor-bugs] #25472 [Obfuscation/Snowflake]: snowflake-client's `-url` option is intolerant of a missing trailing slash.

[Tor Bug Tracker & Wiki]

#25472: snowflake-client's `-url` option is intolerant of a missing trailing 
slash.
---+
 Reporter:  dcf|  Owner:  (none)
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Minor  | Resolution:
 Keywords:  easy   |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+
Changes (by dcf):

 * Attachment "0001-Use-ResolveReference-to-construct-the-client-URL.patch"
 added.


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[tor-bugs] #25472 [Obfuscation/Snowflake]: snowflake-client's `-url` option is intolerant of a missing trailing slash.

[Tor Bug Tracker & Wiki]

#25472: snowflake-client's `-url` option is intolerant of a missing trailing 
slash.
---+
 Reporter:  dcf|  Owner:  (none)
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Minor  |   Keywords:  easy
Actual Points: |  Parent ID:
   Points: |   Reviewer:
  Sponsor: |
---+
 I was following [https://gitweb.torproject.org/pluggable-
 transports/snowflake.git/tree/server-
 webrtc/README.md?id=ff8f3851082e8f7f8b4c8b99b161be35020aeb67 server-
 webrtc's README] and I made a small mistake in the client torrc. Instead
 of
 {{{
 -url http://127.0.0.1:8080/
 }}}
 I had (no trailing slash):
 {{{
 -url http://127.0.0.1:8080
 }}}
 This caused the client to fail with this error:
 {{{
 2018/03/13 03:10:40 Negotiating via BrokerChannel...
 Target URL:
 Front URL:   127.0.0.1:8080
 2018/03/13 03:10:40 BrokerChannel Error: dial tcp: unknown port
 tcp/8080client
 2018/03/13 03:10:40 Failed to retrieve answer. Retrying in 10 seconds
 }}}

 This is because the URL to request is built using string concatenation. It
 built the string `"http://127.0.0.1:8080client"` instead of
 `"http://127.0.0.1:8080/client"`.

 https://gitweb.torproject.org/pluggable-
 
transports/snowflake.git/tree/client/rendezvous.go?id=ff8f3851082e8f7f8b4c8b99b161be35020aeb67#n83
 {{{
 request, err := http.NewRequest("POST", bc.url.String()+"client", data)
 }}}

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