set a default acme provider (letsencrypt)

include/kore/acme.h

@@ -44,6 +44,7 @@ extern "C" {
 #define KORE_ACME_CHALLENGE_SET_CERT	(KORE_MSG_ACME_BASE + 21)
 #define KORE_ACME_CHALLENGE_CLEAR_CERT	(KORE_MSG_ACME_BASE + 22)
 
+void	kore_acme_init(void);
 void	kore_acme_run(void);
 void	kore_acme_setup(void);
 

src/acme.c

@@ -48,6 +48,12 @@
 #define ACME_STATUS_EXPIRED	6
 #define ACME_STATUS_REVOKED	7
 
+/*
+ * The default provider is letsencrypt, can be overwritten via the config
+ * file its acme_provider setting.
+ */
+#define ACME_DEFAULT_PROVIDER	"https://acme-v02.api.letsencrypt.org/directory"
+
 #if defined(__linux__)
 #include "seccomp.h"
 
@@ -241,6 +247,12 @@ char			*acme_root_path = NULL;
 char			*acme_runas_user = NULL;
 u_int32_t		acme_request_timeout = 8;
 
+void
+kore_acme_init(void)
+{
+	acme_provider = kore_strdup(ACME_DEFAULT_PROVIDER);
+}
+
 void
 kore_acme_run(void)
 {

src/kore.c

@@ -259,6 +259,9 @@ main(int argc, char *argv[])
 	kore_auth_init();
 	kore_validator_init();
 	kore_filemap_init();
+#endif
+#if defined(KORE_USE_ACME)
+	kore_acme_init();
 #endif
 	kore_domain_init();
 	kore_module_init();