curl_json plugin: support getting json from a Unix socket as well as a URL

diff --git a/src/curl_json.c b/src/curl_json.c
index a07846d..de66862 100644 (file)
--- a/src/curl_json.c
+++ b/src/curl_json.c
@@ -28,7 +28,12 @@
 #include "utils_avltree.h"
 #include "utils_complain.h"
 
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+
 #include <curl/curl.h>
+
 #include <yajl/yajl_parse.h>
 #if HAVE_YAJL_YAJL_VERSION_H
 # include <yajl/yajl_version.h>
@@ -60,6 +65,8 @@ struct cj_s /* {{{ */
   char *instance;
   char *host;
 
+  char *sock;
+
   char *url;
   char *user;
   char *pass;
@@ -259,7 +266,7 @@ static int cj_cb_start (void *ctx)
   cj_t *db = (cj_t *)ctx;
   if (++db->depth >= YAJL_MAX_DEPTH)
   {
-    ERROR ("curl_json plugin: %s depth exceeds max, aborting.", db->url);
+    ERROR ("curl_json plugin: %s depth exceeds max, aborting.", db->url ? db->url : db->sock);
     return (CJ_CB_ABORT);
   }
   return (CJ_CB_CONTINUE);
@@ -597,20 +604,20 @@ static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
   memset (db, 0, sizeof (*db));
 
   if (strcasecmp ("URL", ci->key) == 0)
-  {
     status = cf_util_get_string (ci, &db->url);
-    if (status != 0)
-    {
-      sfree (db);
-      return (status);
-    }
-  }
+  else if (strcasecmp ("Sock", ci->key) == 0)
+    status = cf_util_get_string (ci, &db->sock);
   else
   {
     ERROR ("curl_json plugin: cj_config: "
            "Invalid key: %s", ci->key);
     return (-1);
   }
+  if (status != 0)
+  {
+    sfree (db);
+    return (status);
+  }
 
   /* Fill the `cj_t' structure.. */
   for (i = 0; i < ci->children_num; i++)
@@ -621,19 +628,19 @@ static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
       status = cf_util_get_string (child, &db->instance);
     else if (strcasecmp ("Host", child->key) == 0)
       status = cf_util_get_string (child, &db->host);
-    else if (strcasecmp ("User", child->key) == 0)
+    else if (db->url && strcasecmp ("User", child->key) == 0)
       status = cf_util_get_string (child, &db->user);
-    else if (strcasecmp ("Password", child->key) == 0)
+    else if (db->url && strcasecmp ("Password", child->key) == 0)
       status = cf_util_get_string (child, &db->pass);
-    else if (strcasecmp ("VerifyPeer", child->key) == 0)
+    else if (db->url && strcasecmp ("VerifyPeer", child->key) == 0)
       status = cf_util_get_boolean (child, &db->verify_peer);
-    else if (strcasecmp ("VerifyHost", child->key) == 0)
+    else if (db->url && strcasecmp ("VerifyHost", child->key) == 0)
       status = cf_util_get_boolean (child, &db->verify_host);
-    else if (strcasecmp ("CACert", child->key) == 0)
+    else if (db->url && strcasecmp ("CACert", child->key) == 0)
       status = cf_util_get_string (child, &db->cacert);
-    else if (strcasecmp ("Header", child->key) == 0)
+    else if (db->url && strcasecmp ("Header", child->key) == 0)
       status = cj_config_append_string ("Header", &db->headers, child);
-    else if (strcasecmp ("Post", child->key) == 0)
+    else if (db->url && strcasecmp ("Post", child->key) == 0)
       status = cf_util_get_string (child, &db->post_body);
     else if (strcasecmp ("Key", child->key) == 0)
       status = cj_config_add_key (db, child);
@@ -652,10 +659,10 @@ static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
     if (db->tree == NULL)
     {
       WARNING ("curl_json plugin: No (valid) `Key' block "
-               "within `URL' block `%s'.", db->url);
+               "within `%s' block `%s'.", db->url ? "URL" : "Sock", db->url ? db->url : db->sock);
       status = -1;
     }
-    if (status == 0)
+    if (status == 0 && db->url)
       status = cj_init_curl (db);
   }
 
@@ -676,7 +683,7 @@ static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
     ud.free_func = cj_free;
 
     ssnprintf (cb_name, sizeof (cb_name), "curl_json-%s-%s",
-               db->instance, db->url);
+               db->instance, db->url ? db->url : db->sock);
 
     plugin_register_complex_read (/* group = */ NULL, cb_name, cj_read,
                                   /* interval = */ NULL, &ud);
@@ -705,7 +712,7 @@ static int cj_config (oconfig_item_t *ci) /* {{{ */
   {
     oconfig_item_t *child = ci->children + i;
 
-    if (strcasecmp ("URL", child->key) == 0)
+    if (strcasecmp ("Sock", child->key) == 0 || strcasecmp ("URL", child->key) == 0)
     {
       status = cj_config_add_url (child);
       if (status == 0)
@@ -765,7 +772,42 @@ static void cj_submit (cj_t *db, cj_key_t *key, value_t *value) /* {{{ */
   plugin_dispatch_values (&vl);
 } /* }}} int cj_submit */
 
-static int cj_curl_perform (cj_t *db) /* {{{ */
+static int cj_sock_perform (cj_t *db) /* {{{ */
+{
+  struct sockaddr_un sa_unix = {};
+  sa_unix.sun_family = AF_UNIX;
+  sstrncpy (sa_unix.sun_path, db->sock, sizeof (sa_unix.sun_path));
+
+  int fd = socket (AF_UNIX, SOCK_STREAM, 0);
+  if (fd < 0)
+    return (-1);
+  if (connect (fd, (struct sockaddr *)&sa_unix, sizeof(sa_unix)) < 0)
+  {
+    ERROR ("curl_json plugin: connect(%s) failed: %s",
+           (db->sock != NULL) ? db->sock : "<null>", strerror(errno));
+    close (fd);
+    return (-1);
+  }
+
+  ssize_t red;
+  do {
+    unsigned char buffer[4096];
+    red = read (fd, buffer, sizeof(buffer));
+    if (red < 0) {
+        ERROR ("curl_json plugin: read(%s) failed: %s",
+               (db->sock != NULL) ? db->sock : "<null>", strerror(errno));
+        close (fd);
+        return (-1);
+    }
+    if (!cj_curl_callback (buffer, red, 1, db))
+        break;
+  } while (red > 0);
+  close (fd);
+  return (0);
+} /* }}} int cj_sock_perform */
+
+
+static int cj_curl_perform(cj_t *db) /* {{{ */
 {
   int status;
   long rc;
@@ -790,7 +832,6 @@ static int cj_curl_perform (cj_t *db) /* {{{ */
         "response code %ld (%s)", rc, url);
     return (-1);
   }
-
   return (0);
 } /* }}} int cj_curl_perform */
 
@@ -813,7 +854,7 @@ static int cj_perform (cj_t *db) /* {{{ */
     return (-1);
   }
 
-  if (cj_curl_perform(db) < 0)
+  if (db->url ? cj_curl_perform (db) < 0 : cj_sock_perform (db) < 0)
   {
     yajl_free (db->yajl);
     db->yajl = yprev;