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af-alg: Silently skip probing algorithms if AF_ALG is not supported 

If the af-alg plugin is enabled, but kernel support is missing, we get
an error line during startup for each probed algorithm. This is way too
verbose, so just skip probing if AF_ALG is unsupported.
This commit is contained in:
Martin Willi 2016-05-19 11:13:24 +02:00
parent 989db1bf2f
commit 294ac097d6
1 changed files with 19 additions and 0 deletions
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19
src/libstrongswan/plugins/af_alg/af_alg_plugin.c
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@ -22,6 +22,8 @@
#include "af_alg_prf.h"
#include "af_alg_crypter.h"
#include <unistd.h>
typedef struct private_af_alg_plugin_t private_af_alg_plugin_t;
/**
@ -41,6 +43,19 @@ METHOD(plugin_t, get_name, char*,
return "af-alg";
}
static bool af_alg_supported()
{
int fd;
fd = socket(AF_ALG, SOCK_SEQPACKET, 0);
if (fd != -1)
{
close(fd);
return true;
}
return false;
}
METHOD(plugin_t, get_features, int,
private_af_alg_plugin_t *this, plugin_feature_t *features[])
{
@ -50,6 +65,10 @@ METHOD(plugin_t, get_features, int,
if (!count)
{ /* initialize only once */
if (!af_alg_supported())
{
return 0;
}
f[count++] = PLUGIN_REGISTER(HASHER, af_alg_hasher_create);
af_alg_hasher_probe(f, &count);
f[count++] = PLUGIN_REGISTER(SIGNER, af_alg_signer_create);