Build cURL Library

cURL is a computer software project providing a library (libcurl) and a command-line tool (curl) for transferring data using various network protocols. It builds and works identically on many platforms. cURL supports HTTPS and performs SSL certificate verification by default when a secure protocol is specified such as HTTPS. It relies on the OpenSSL libraries to perform SSL certificate verification.

The following steps show how to build a cURL library and cURL binary file from the cURL source package on a Linux machine (Centos 7). Moreover, the cURL library and cURL binary file will use the OpenSSSL and zlib libraries created in the previous sections.

1.      Download the cURL source code

The cURL is open source and the source code is available on the cURL official website ( https://curl.se/download.html ). The wget command can be used to download the cURL source code package. At the time of this writing, the current version of the cURL package is curl-7.83.0.

First, change the directory to /usr/local/src . The source code of the cURL library will be extracted in this directory.

2.      Decompress the cURL package

The cURL source package file is compressed so the tar command can be used to decompress the package.

Run the following tar command to decompress the cURL source package.

Description --prefix=/opt/curl The top of the installation directory tree. The cURL files will be created in this directory (/opt/curl) --with-openssl=/opt/openssl Where to look for OpenSSL. PATH points to the SSL installation (/opt/openssl) --with-zlib=/opt/zlib Where to look for zlib. PATH points to the zlib installation (/opt/zlib)

At this point, the cURL binary and library files are built properly.

Use the Libraries with Refinitiv Real-Time SDK C/C++

The zlib, OpenSSL, and cURL can be used with the Refinitiv Real-Time SDK C/C++ applications to connect to encrypted servers or Refinitiv Real-Time Optimized on the cloud.

1.      Copy the following files to the current directory of the Refinitiv Real-Time SDK C/C++ application.

/opt/zlib/lib/libz.so.1.2.12

/opt/openssl/lib/libssl.so.1.1

/opt/openssl/lib/libcrypto.so.1.1

/opt/curl/lib/libcurl.so.4.8.0

export LD_LIBRARY_PATH=/opt/refinitiv/Real-Time-SDK/Cpp-C/Ema/Executables/OL7_64_GCC485/Optimized

Summary

OpenSSL, zlib, and cURL are open-source and popular software projects used to secure communications over computer networks, compress data, and transfer data through various network protocols. Users can easily install these packages by using the package management tool. However, the installed packages may be outdated.

Another option is building the binary packages from the project’s source code. With this method, users can get the latest version of the packages. This article demonstrates step by step to build OpenSSL, zlib, and curl libraries from the source code on a Linux machine (Centos 7). There are four steps to building the package. The first step is downloading the source code package from the official project website. The second step is decompressing the package. The third step is configuring the package and the final step is building the package. The outcome contains executable files, development libraries, header files, and man pages.

References

cURL. n.d. cURL . [online] Available at: < https://curl.se/ > [Accessed 3 May 2022].

En.wikipedia.org. n.d. cURL - Wikipedia . [online] Available at: < https://en.wikipedia.org/wiki/CURL > [Accessed 3 May 2022].

OpenSSL. n.d. OpenSSL . [online] Available at: < https://www.openssl.org/ > [Accessed 3 May 2022].

En.wikipedia.org. n.d. OpenSSL - Wikipedia . [online] Available at: < https://en.wikipedia.org/wiki/OpenSSL > [Accessed 3 May 2022].

Developers.refinitiv.com. n.d. Refinitiv Real-Time C++ SDK | Refinitiv Developers . [online] Available at: < https://developers.refinitiv.com/en/api-catalog/refinitiv-real-time-opnsrc/rt-sdk-cc > [Accessed 3 May 2022].

En.wikipedia.org. n.d. zlib - Wikipedia. [online] Available at: <https://en.wikipedia.org/wiki/Zlib> [Accessed 11 May 2022].

Zlib.net. n.d. zlib Home Site. [online] Available at: <https://zlib.net/> [Accessed 11 May 2022].

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