p11_child: split common and NSS code into separate files

To avoid code duplication when adding support for OpenSSL the common
code is move into a separate file.

Related to https://pagure.io/SSSD/sssd/issue/3489

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Makefile.am

@@ -843,6 +843,7 @@ dist_noinst_HEADERS = \
     src/shared/io.h \
     src/shared/murmurhash3.h \
     src/shared/safealign.h \
+    src/p11_child/p11_child.h \
     $(NULL)
 
 
@@ -4268,6 +4269,7 @@ proxy_child_LDADD = \
     $(SSSD_INTERNAL_LTLIBS)
 
 p11_child_SOURCES = \
+    src/p11_child/p11_child_common.c \
     src/p11_child/p11_child_nss.c \
     src/util/atomic_io.c \
     src/util/util.c \

src/p11_child/p11_child.h

@@ -0,0 +1,55 @@
+/*
+    SSSD
+
+    Helper child to commmunicate with SmartCard
+
+    Authors:
+        Sumit Bose <sbose@redhat.com>
+
+    Copyright (C) 2018 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __P11_CHILD_H__
+#define __P11_CHILD_H__
+
+struct p11_ctx;
+
+enum op_mode {
+    OP_NONE,
+    OP_AUTH,
+    OP_PREAUTH,
+    OP_VERIFIY
+};
+
+enum pin_mode {
+    PIN_NONE,
+    PIN_STDIN,
+    PIN_KEYPAD
+};
+
+errno_t init_p11_ctx(TALLOC_CTX *mem_ctx, const char *nss_db,
+                     struct p11_ctx **p11_ctx);
+
+errno_t init_verification(struct p11_ctx *p11_ctx,
+                          struct cert_verify_opts *cert_verify_opts);
+
+bool do_verification_b64(struct p11_ctx *p11_ctx, const char *cert_b64);
+
+errno_t do_card(TALLOC_CTX *mem_ctx, struct p11_ctx *p11_ctx,
+                enum op_mode mode, const char *pin,
+                const char *module_name_in, const char *token_name_in,
+                const char *key_id_in, char **_multi);
+#endif /* __P11_CHILD_H__ */