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ldap: detect version of "legacy" LDAP

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Legacy LDAP means an OpenLDAP-compatible implementation
without the private API `ldap_init_fd()` introduced in OpenLDAP
2.4.6+ (2007-10-31), and not WinLDAP.

One known example is Apple's LDAP build, which is based on
OpenLDAP 2.4.28 (2011-11-25), without providing this private API.

The version query API was introduced around 1998-1999, before
the minimum (2.0 2000-08-01) required by curl.

Follow-up to 3e2a946926 #19808
Closes #19832
This commit is contained in:
Viktor Szakats 2025-12-04 15:32:44 +01:00
parent f1f76e0ea8
commit 859ce48de1
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GPG key ID: B5ABD165E2AEF201
1 changed files with 21 additions and 1 deletions
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22
lib/ldap.c
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@ -1029,7 +1029,27 @@ void Curl_ldap_version(char *buf, size_t bufsz)
#ifdef USE_WIN32_LDAP
curl_msnprintf(buf, bufsz, "WinLDAP");
#else
curl_msnprintf(buf, bufsz, "LDAP/1");
#ifdef __APPLE__
static const char *flavor = "/Apple";
#else
static const char *flavor = "";
#endif
LDAPAPIInfo api;
api.ldapai_info_version = LDAP_API_INFO_VERSION;
if(ldap_get_option(NULL, LDAP_OPT_API_INFO, &api) == LDAP_OPT_SUCCESS) {
unsigned int patch = (unsigned int)(api.ldapai_vendor_version % 100);
unsigned int major = (unsigned int)(api.ldapai_vendor_version / 10000);
unsigned int minor =
(((unsigned int)api.ldapai_vendor_version - major * 10000)
- patch) / 100;
curl_msnprintf(buf, bufsz, "%s/%u.%u.%u%s",
api.ldapai_vendor_name, major, minor, patch, flavor);
ldap_memfree(api.ldapai_vendor_name);
ber_memvfree((void **)api.ldapai_extensions);
}
else
curl_msnprintf(buf, bufsz, "LDAP/1");
#endif
}