static enum aws_libcrypto_version s_resolve_libcrypto_lib()

in source/unix/openssl_platform_init.c [416:476]

• 57 lines of code
• 10 McCabe index (conditional complexity)

static enum aws_libcrypto_version s_resolve_libcrypto_lib(void) {
    const char *libcrypto_102 = "libcrypto.so.1.0.0";
    const char *libcrypto_111 = "libcrypto.so.1.1";

    AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto 1.0.2");
    void *module = dlopen(libcrypto_102, RTLD_NOW);
    if (module) {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "resolving against libcrypto 1.0.2");
        enum aws_libcrypto_version result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_0_2, module);
        if (result == AWS_LIBCRYPTO_1_0_2) {
            return result;
        }
        dlclose(module);
    } else {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto 1.0.2 not found");
    }

    AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto 1.1.1");
    module = dlopen(libcrypto_111, RTLD_NOW);
    if (module) {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "resolving against libcrypto 1.1.1");
        enum aws_libcrypto_version result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_1_1, module);
        if (result == AWS_LIBCRYPTO_1_1_1) {
            return result;
        }
        dlclose(module);
    } else {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto 1.1.1 not found");
    }

    AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto.so");
    module = dlopen("libcrypto.so", RTLD_NOW);
    if (module) {
        unsigned long (*openssl_version_num)(void) = NULL;
        *(void **)(&openssl_version_num) = dlsym(module, "OpenSSL_version_num");
        if (openssl_version_num) {
            unsigned long version = openssl_version_num();
            AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so reported version is 0x%lx", version);
            enum aws_libcrypto_version result = AWS_LIBCRYPTO_NONE;
            if (version >= 0x10101000L) {
                AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "probing libcrypto.so for 1.1.1 symbols");
                result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_1_1, module);
            } else if (version >= 0x10002000L) {
                AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "probing libcrypto.so for 1.0.2 symbols");
                result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_0_2, module);
            } else {
                AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so reported version is unsupported");
            }
            if (result != AWS_LIBCRYPTO_NONE) {
                return result;
            }
        } else {
            AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "Unable to determine version of libcrypto.so");
        }
        dlclose(module);
    } else {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so not found");
    }

    return AWS_LIBCRYPTO_NONE;
}