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Problem report
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Resolution: Unresolved
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Major
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None
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7.0.16, 7.2.10, 7.4.0, 8.0.0alpha1 (master)
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Support backlog
Our use case: we need to built Zabbix Agent for applience with Linux kernel 5.14.x and very limited set of packages; the agent should support metric 'web.page.get["http://USER:PASS@HOST:PORT/PATH"]'.
As URL conains credentials, the agent should be linked with 'libcurl' library.
We're trying to compile the agent from sources on the fresh installed SLES 15 sp5 system (+all current patches), it has just the same kernel version.
Steps to reproduce:
- Download the needed sources of Zabbix and dependant libraries, then untar them into the "/opt" directory:
- Compile and install to "/opt" directory all libraries:
- pcre2:
./configure --prefix=/opt --enable-jit=auto --disable-shared make make install
Result: files /opt/lib/libpcre2-8.a and /opt/bin/pcre2-config.
- OpenSSL:
./Configure --prefix=/opt --libdir=lib no-shared no-docs no-autoalginit no-autoerrinit no-autoload-config no-dso no-filenames no-makedepend no-module no-pinshared no-ssl-trace make make install
Result: files libcrypto.a and libssl.a in the /opt/lib directory.
- curl:
./configure --prefix=/opt --disable-shared --without-libpsl --with-openssl=/opt --disable-openssl-auto-load-config \ --disable-ipv6 --disable-netrc --disable-progress-meter --disable-unix-sockets --without-librtmp --disable-dict \ --disable-file --disable-ftp --disable-gopher --disable-imap --disable-ldap --disable-ldaps --disable-mqtt \ --disable-pop3 --disable-rtsp --disable-smb --disable-smtp --disable-telnet --disable-tftp make make install
Result: binaries curl and curl-config in the /opt/bin directory, library /opt/lib/libcurl.a.
- pcre2:
- Compile Zabbix Agent (v6.0.x and v7.0.x) using these static libraries:
./configure --enable-agent --enable-static-libs --with-libpcre2-lib=/opt/lib --with-libcurl=/opt/bin/curl-config make
- Test compiled agent using any working web site:
cd src/zabbix_agent ./zabbix_agentd -t 'web.page.get["http://user:[email protected]"]'Result:
Both versions of Zabbix Agent are built without problems.
Metric "web.page.get" on the v6.0.x works successfully, for example:web.page.get["http://user:[email protected]"] [t|HTTP/1.1 301 Moved Permanently Server: nginx/1.21.5 Date: Wed, 21 Feb 2024 16:43:40 GMT Content-Type: text/html Content-Length: 169 Connection: keep-alive Location: https://www.example.com/ <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx/1.21.5</center> </body> </html>]
However, Zabbix Agent v7.0.x just crashes with the following error:
zabbix_agentd [24324]: ERROR: cannot find cURL function curl_easy_header(): ./zabbix_agentd: undefined symbol: curl_easy_header
Expected:
Successfully working Zabbix Agent with a functioning "web.page.get" metric.
Additional info:
This error message is NOT really accurate, as the Agent was built successfully (no any errors during configuring, compiling and linking).
It seems like this is a consequence of changes introduced in the ZBXNEXT-3623: the feature check assumes that the "curl" library is always a dynamic library; but it does not take into account that it could be static.
Probably, it is the result of attempts to check features of cURL library dynamically (lines 155-167 in the src/libs/zbxcurl/curl.c file), but in our case this library is static.
So, it is a regression comparing to v6.0.x (we lost a functionality to build the Agent statically with a "curl" library).
See also: ZBX-24140.