I also tried to use libssh as a backend (rather than libssh2), and I'm
getting a segfault. Here's the backtrace:

#0 0x0000000000000071 in ?? ()
#1 0x00007ffff689c41a in EVP_MD_CTX_cleanup () from
/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#2 0x00007ffff68068d7 in HMAC_CTX_cleanup () from
/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#3 0x00007ffff7b82191 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#4 0x00007ffff7b7fc13 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#5 0x00007ffff7b806f6 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#6 0x00007ffff7b7f638 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#7 0x00007ffff7b7a15e in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#8 0x00007ffff7b7f056 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#9 0x00007ffff7b87b7d in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#10 0x00007ffff7b880e3 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#11 0x00007ffff7b90662 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#12 0x00007ffff7b8d0ac in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#13 0x00007ffff7b8e009 in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#14 0x00007ffff7b8e0dd in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#15 0x00007ffff7b7aae4 in ssh_connect () from
/usr/lib/x86_64-linux-gnu/libssh.so.4
#16 0x00005555555e6bfe in myssh_statemach_act ()
#17 0x00005555555e9c96 in myssh_multi_statemach ()
#18 0x00005555555c1266 in multi_runsingle ()
#19 0x00005555555c2414 in curl_multi_perform ()
#20 0x00005555555bc204 in curl_easy_perform ()
#21 0x00005555555b9fb3 in main () at router_fw_dump.cpp:83

I'm using libcurl 7.58.

2018-07-03 17:28 GMT-03:00 Martin Galvan <omgalvan.86_at_gmail.com>:
> Hi all,
>
> I have a Cisco switch that I'm trying to copy files from through SCP.
> While I'm using libcurl, essentially what I'm doing is:
>
> curl -v scp://cisco/flash:/someFile -u user:pass -k
>
> The output is:
>
> * TCP_NODELAY set
> * Connected to 172.16.0.190 (172.16.0.190) port 22 (#0)
> * SSH MD5 fingerprint: dcabc9f67a498c9faafdc7cfe5673274
> * SSH authentication methods available: keyboard-interactive,password
> * Initialized password authentication
> * Authentication complete
> * SSH CONNECT phase done
> * Failed to recv file
> * Connection #0 to host 172.16.0.190 left intact
> curl: (78) Failed to recv file
>
> Using regular SCP works fine. However, the switch's SSH implementation
> is ancient, and I have to pass
> -oKexAlgorithms=+diffie-hellman-group1-sha1 to scp for the connection
> to work. I don't think this is the problem, though, because of the
> "SSH CONNECT phase done" message.
>
> I saw that Mike Gibson was having this same problem back in 2013. It
> looks like his issue was on the -p option used by libssh2:
>
> https://curl.haxx.se/mail/lib-2013-08/0125.html
>
> However, he didn't post any updates. Doing scp -p doesn't work (I get
> an error saying "-p -r -d options not supported"), so maybe I'm having
> the same issue as he did. The switch isn't showing any logs related to
> SCP as Mike's did, though.
>
> From that thread, the solution seems to be to somehow make
> curl/libcurl not use -p. How can I do this?
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Received on 2018-07-03