Thanks for the answer - Ii found out that it has todo with the -static
flag.
My rationale was that I wanted to have openSSL statically compiled into
my code, so its to be used easier in the transition period where
OpenSSL3 is not yet rolled out in major distributions.
With dynamic linkage, it works like expected.
Thank you!
Am 2022-06-22 9:41, schrieb David von Oheimb:
Hi again Beni,
On Wed, 2022-06-22 at 08:29 +0200, Benedikt Hallinger wrote:
Hi David and thank you for your advice and example.
my pleasure.
I was about to send a slightly improved version of my example code
regarding the use of proxies and the expected content type - see
attached
and an extended sample invocation (of course, adapt "myproxy" as
needed):
https_proxy=myproxy ./http_client https://example.com && echo ok
I tried to compile it, run onto errors tough.
I just put the file into my openssl source tree, which is on commit:
commit 9e86b3815719d29f7bde2294403f97c42ce82a16 (HEAD,
origin/openssl-3.0)
I've just tried myself using that commit (and default configuration)
and as expected everything works fine.
$ gcc http_client.c -Iinclude -L. -lcrypto -lssl -o http_client
/usr/bin/ld: ./libssl.a(libssl-lib-ssl_cert.o): in function
`add_uris_recursive':
ssl_cert.c:(.text+0x116): undefined reference to `OSSL_STORE_open'
/usr/bin/ld: ssl_cert.c:(.text+0x134): undefined reference to
`OSSL_STORE_eof'
[...]
This issue is pretty surely unrelated to the example code itself
but most likely due to some general build issue you have, such as some
inconsistency with pre-installed OpenSSL versions.
Sorry that I do not have the time to provide further aid on such
general build issues.
David
Am 2022-06-21 22:52, schrieb David von Oheimb:
Hallo Beni,
good that you ask.
Using the new HTTP client API with TLS (possibly via a proxy) indeed
is not easy so far.
I'm going to improve this by adding some high-level helper functions
and extending the docs.
A good starting point when looking for examples is, as usual, the
application code in apps/.
In this case, there is some pretty useful code in apps/lib/apps.c,
but it turns out that the adaptation of app_http_get_asn1() and
app_http_tls_cb()
for receiving plain text (rather than ASN.1 encoded data) from the
server
is not straightforward because OSSL_HTTP_get() may close the SSL
read
BIO prematurely.
Also the behavior of non-blocking BIOs makes things a little more
tricky than expected.
Meanwhile I got it working - see the example attached.
Example build and usage:
gcc http_client.c -Iinclude -L. -lcrypto -lssl -o http_client
./http_client https://httpbin.org/ && echo ok
Regards,
David
On 20.06.22 10:54, Benedikt Hallinger wrote:
Hi there,
I currently try to get my hands dirty with C++ and the new HTTPs
client
introduced with OpenSSL 3.
However I struggle to get started. My goal is to open a https
secured
website and download its contents into a std::string for further
parsing.
Does someone on the list know of a small basic example?
I imagine that I'm not the first person implementing a HTTPs website
connector with OpenSSL 3.
Thank you for your support,
Beni
