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autofs-5.1.6 - add support for new sss autofs proto version call
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From: Ian Kent <raven@themaw.net>
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Add sss protocol feature version function existence check and local get
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function.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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modules/lookup_sss.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 45 insertions(+)
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diff --git a/CHANGELOG b/CHANGELOG
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index 1830730..7c22aa1 100644
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--- a/CHANGELOG
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+++ b/CHANGELOG
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@@ -96,6 +96,7 @@ xx/xx/2018 autofs-5.1.5
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- fix sss_master_map_wait timing.
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- add sss ECONREFUSED return handling.
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- use mapname in sss context for setautomntent().
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+- add support for new sss autofs proto version call.
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19/12/2017 autofs-5.1.4
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- fix spec file url.
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diff --git a/modules/lookup_sss.c b/modules/lookup_sss.c
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index c44c55d..3819981 100644
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--- a/modules/lookup_sss.c
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+++ b/modules/lookup_sss.c
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@@ -37,11 +37,29 @@
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#define SSS_SO_NAME "libsss_autofs"
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+/* If the sss library protocol version is greater than 0 there are
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+ * more possibile error returns from the sss autofs library calls.
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+ *
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+ * If ECONNREFUSED is returned then sssd is not running or not
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+ * configured on the system, immediately return an unavailable
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+ * status.
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+ *
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+ * A return of EHOSTDOWN means sss backend server is down so we
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+ * should retry.
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+ *
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+ * With older sss ilibrary we can get a return of ENOENT for the
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+ * above cases so also wait in that case since we can't be sure
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+ * the map doesn't exist.
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+ */
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+#define SSS_PROTO_VERSION 1
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+
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+unsigned int _sss_auto_protocol_version(unsigned int);
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int _sss_setautomntent(const char *, void **);
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int _sss_getautomntent_r(char **, char **, void *);
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int _sss_getautomntbyname_r(char *, char **, void *);
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int _sss_endautomntent(void **);
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+typedef unsigned int (*protocol_version_t) (unsigned int);
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typedef int (*setautomntent_t) (const char *, void **);
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typedef int (*getautomntent_t) (char **, char **, void *);
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typedef int (*getautomntbyname_t) (char *, char **, void *);
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@@ -50,6 +68,7 @@ typedef int (*endautomntent_t) (void **);
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struct lookup_context {
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const char *mapname;
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void *dlhandle;
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+ protocol_version_t protocol_version;
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setautomntent_t setautomntent;
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getautomntent_t getautomntent_r;
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getautomntbyname_t getautomntbyname_r;
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@@ -58,6 +77,8 @@ struct lookup_context {
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};
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int lookup_version = AUTOFS_LOOKUP_VERSION; /* Required by protocol */
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+int sss_proto_version = SSS_PROTO_VERSION; /* 0 => initial version,
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+ * >= 1 => new error handling. */
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static int open_sss_lib(struct lookup_context *ctxt)
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{
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@@ -78,6 +99,11 @@ static int open_sss_lib(struct lookup_context *ctxt)
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return 1;
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ctxt->dlhandle = dh;
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+ /* Don't fail on NULL, it's simply not present in this version of the
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+ * sss autofs library.
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+ */
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+ ctxt->protocol_version = (protocol_version_t) dlsym(dh, "_sss_auto_protocol_version");
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+
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ctxt->setautomntent = (setautomntent_t) dlsym(dh, "_sss_setautomntent");
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if (!ctxt->setautomntent)
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goto lib_names_fail;
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@@ -193,6 +219,7 @@ int lookup_reinit(const char *mapfmt,
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}
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new->dlhandle = ctxt->dlhandle;
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+ new->protocol_version = ctxt->protocol_version;
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new->setautomntent = ctxt->setautomntent;
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new->getautomntent_r = ctxt->getautomntent_r;
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new->getautomntbyname_r = ctxt->getautomntbyname_r;
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@@ -219,6 +246,23 @@ static int setautomntent(unsigned int logopt,
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return ret;
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}
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+static unsigned int proto_version(struct lookup_context *ctxt)
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+{
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+ unsigned int proto_version = 0;
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+
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+ if (ctxt->protocol_version) {
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+ /* If ctxt->protocol_version() is defined it's assumed
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+ * that for sss_proto_version <= sss autofs library
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+ * protocol version ctxt->protocol_version() will
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+ * return the version requested by autofs to indicate
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+ * it userstands what the autofs module is capable of
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+ * handling.
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+ */
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+ proto_version = ctxt->protocol_version(sss_proto_version);
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+ }
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+ return proto_version;
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+}
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+
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static int setautomntent_wait(unsigned int logopt,
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struct lookup_context *ctxt,
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void **sss_ctxt, unsigned int retries)
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