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Enable SSL library detection via PQsslAttribute()

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Currently, libpq client code must have a connection handle
before it can query the "library" SSL attribute.  This poses
problems if the client needs to know what SSL library is in
use before constructing a connection string.

Allow PQsslAttribute(NULL, "library") to return the library
in use -- currently, just "OpenSSL" or NULL. The new behavior
is announced with the LIBPQ_HAS_SSL_LIBRARY_DETECTION feature
macro, allowing clients to differentiate between a libpq that
was compiled without SSL support and a libpq that's just too
old to tell.

Author: Jacob Champion <pchampion@vmware.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/4c8b76ef434a96627170a31c3acd33cbfd6e41f1.camel@vmware.com
This commit is contained in:
Daniel Gustafsson
2022-03-29 14:02:45 +02:00
parent 8cd7627c7b
commit ebc8b7d441
8 changed files with 75 additions and 4 deletions
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6
src/interfaces/libpq/fe-secure-openssl.c
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@ -1631,14 +1631,14 @@ PQsslAttributeNames(PGconn *conn)
const char *
PQsslAttribute(PGconn *conn, const char *attribute_name)
{
if (strcmp(attribute_name, "library") == 0)
return "OpenSSL";
if (!conn)
return NULL;
if (conn->ssl == NULL)
return NULL;
if (strcmp(attribute_name, "library") == 0)
return "OpenSSL";
if (strcmp(attribute_name, "key_bits") == 0)
{
static char sslbits_str[12];