#10215: Windows tcp: Starting connection attempt to <GARBAGE> port <GARBAGE>
-------------------------------------+----------------------------------
Reporter: Korl | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: ffmpeg
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+----------------------------------
Old description:
> Saving RTSP stream from a chinese camera to disk with
>
> {{{
> C:\app\ffmpeg-5.1.2-full_build\bin\ffmpeg.exe -hide_banner
> -rtsp_transport tcp -i "rtsp://192.168.4.15:8754/11" -c copy
> "C:\ffmpeg_test\rec.mkv" -y -nostdin -loglevel debug
> }}}
>
> works well and produces the following log
>
> {{{
> [tcp @ 000002405c964000] No default whitelist set
> [tcp @ 000002405c964000] Original list of addresses:
> [tcp @ 000002405c964000] Address 192.168.4.15 port 8754
> [tcp @ 000002405c964000] Interleaved list of addresses:
> [tcp @ 000002405c964000] Address 192.168.4.15 port 8754
> [tcp @ 000002405c964000] Starting connection attempt to 192.168.4.15 port
> 8754
> [tcp @ 000002405c964000] Successfully connected to 192.168.4.15 port 8754
> }}}
>
> putting this same command line in a batch file and run it as service
>
> {{{
> sc create "cam_save" start= demand displayname= "cam_save" binpath=
> ""C:\App\svcbatch-1.4.0-win-x64\svcbatch.exe"
> C:\ffmpeg_test\batch_to_run.bat"
> }}}
>
> fails with
>
> {{{
> [tcp @ 000001cd0c777b80] No default whitelist set
> [tcp @ 000001cd0c777b80] Original list of addresses:
> [tcp @ 000001cd0c777b80] Address ˘ź< port ÷{w Í?
> [tcp @ 000001cd0c777b80] Interleaved list of addresses:
> [tcp @ 000001cd0c777b80] Address ˘ź< port ÷{w Í?
> [tcp @ 000001cd0c777b80] Starting connection attempt to ˘ź< port "2ü Í?
> [tcp @ 000001cd0c777b80] Connected attempt failed: Error number -10106
> occurred
> [tcp @ 000001cd0c777b80] Connection to tcp://192.168.4.15:8754?timeout=0
> failed: Error number -10106 occurred
> rtsp://192.168.4.15:8754/11: Unknown error
> }}}
>
> I'm guessing it is a security issue with windows services (don't know
> which) but I guess the garbage displayed is a memory leak.
>
> Reproduced on two different PC's with windows builds taken from Gyan and
> BtbN 5.x and 4.x
New description:
Saving RTSP stream from a chinese camera to disk with
{{{
C:\app\ffmpeg-5.1.2-full_build\bin\ffmpeg.exe -hide_banner -rtsp_transport
tcp -i "rtsp://192.168.4.15:8754/11" -c copy "C:\ffmpeg_test\rec.mkv" -y
-nostdin -loglevel debug
}}}
works well and produces the following log
{{{
[tcp @ 000002405c964000] No default whitelist set
[tcp @ 000002405c964000] Original list of addresses:
[tcp @ 000002405c964000] Address 192.168.4.15 port 8754
[tcp @ 000002405c964000] Interleaved list of addresses:
[tcp @ 000002405c964000] Address 192.168.4.15 port 8754
[tcp @ 000002405c964000] Starting connection attempt to 192.168.4.15 port
8754
[tcp @ 000002405c964000] Successfully connected to 192.168.4.15 port 8754
}}}
putting this same command line in a batch file and run it as service
{{{
sc create "cam_save" start= demand displayname= "cam_save" binpath=
""C:\App\svcbatch-1.4.0-win-x64\svcbatch.exe"
C:\ffmpeg_test\batch_to_run.bat"
}}}
fails with
{{{
[tcp @ 000001cd0c777b80] No default whitelist set
[tcp @ 000001cd0c777b80] Original list of addresses:
[tcp @ 000001cd0c777b80] Address ˘ź< port ÷{wÍ?
[tcp @ 000001cd0c777b80] Interleaved list of addresses:
[tcp @ 000001cd0c777b80] Address ˘ź< port ÷{wÍ?
[tcp @ 000001cd0c777b80] Starting connection attempt to ˘ź< port "2üÍ?
[tcp @ 000001cd0c777b80] Connected attempt failed: Error number -10106
occurred
[tcp @ 000001cd0c777b80] Connection to tcp://192.168.4.15:8754?timeout=0
failed: Error number -10106 occurred
rtsp://192.168.4.15:8754/11: Unknown error
}}}
I'm guessing it is a security issue with windows services (don't know
which) but I guess the garbage displayed is a memory leak.
Reproduced on two different PC's with windows builds taken from Gyan and
BtbN 5.x and 4.x
--
Comment (by Korl):
I found out that this case appears if %SystemRoot% is not defined.
msock.dll cannot be loaded and none of the socket functions work.
in file libavformat/network.c
{{{
getnameinfo(addrs->ai_addr, addrs->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf,
sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
av_log(h, AV_LOG_VERBOSE, "Starting connection attempt to %s
port %s\n",
hostbuf, portbuf);
last_err = start_connect_attempt(&attempts[nb_attempts],
&addrs,
timeout_ms_per_address, h,
customize_fd, customize_ctx);
}}}
result of getnameinfo() should be checked before continuing.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10215#comment:1>
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