#! /bin/sh /usr/share/dpatch/dpatch-run
## bts770683_curl_init.dpatch by Jeremy Katz <jeremy@katzbox.net>
##
## DP: Call curl_global_init() in _init of plugins using curl.
## DP:
## DP: curl_global_init() or curl_easy_init() has to be called in the init
## DP: callback of plugins using curl while collectd still runs single
## DP: threaded. Else, collectd may crash with a segfault due to concurrent
## DP: memory access by curl.
## DP:
## DP: Upstream bug report:
## DP: https://github.com/collectd/collectd/issues/526

@DPATCH@

diff a/src/apache.c b/src/apache.c
--- a/src/apache.c
+++ b/src/apache.c
@@ -702,9 +702,18 @@ static int apache_read_host (user_data_t *user_data) /* {{{ */
 	return (0);
 } /* }}} int apache_read_host */
 
+static int apache_init (void) /* {{{ */
+{
+	/* Call this while collectd is still single-threaded to avoid
+	 * initialization issues in libgcrypt. */
+	curl_global_init (CURL_GLOBAL_SSL);
+	return (0);
+} /* }}} int apache_init */
+
 void module_register (void)
 {
 	plugin_register_complex_config ("apache", config);
+	plugin_register_init ("apache", apache_init);
 } /* void module_register */
 
 /* vim: set sw=8 noet fdm=marker : */
diff a/src/curl.c b/src/curl.c
--- a/src/curl.c
+++ b/src/curl.c
@@ -566,6 +566,7 @@ static int cc_init (void) /* {{{ */
     INFO ("curl plugin: No pages have been defined.");
     return (-1);
   }
+  curl_global_init (CURL_GLOBAL_SSL);
   return (0);
 } /* }}} int cc_init */
 
diff --git a/src/curl_json.c b/src/curl_json.c
index 24e1df1..0948962 100644
--- a/src/curl_json.c
+++ b/src/curl_json.c
@@ -882,9 +882,18 @@ static int cj_read (user_data_t *ud) /* {{{ */
   return cj_curl_perform (db, db->curl);
 } /* }}} int cj_read */
 
+static int cj_init (void) /* {{{ */
+{
+  /* Call this while collectd is still single-threaded to avoid
+   * initialization issues in libgcrypt. */
+  curl_global_init (CURL_GLOBAL_SSL);
+  return (0);
+} /* }}} int cj_init */
+
 void module_register (void)
 {
   plugin_register_complex_config ("curl_json", cj_config);
+  plugin_register_init ("curl_json", cj_init);
 } /* void module_register */
 
 /* vim: set sw=2 sts=2 et fdm=marker : */
diff --git a/src/curl_xml.c b/src/curl_xml.c
index b941f02..e31e73d 100644
--- a/src/curl_xml.c
+++ b/src/curl_xml.c
@@ -926,9 +926,18 @@ static int cx_config (oconfig_item_t *ci) /* {{{ */
   return (0);
 } /* }}} int cx_config */
 
+static int cx_init (void) /* {{{ */
+{
+  /* Call this while collectd is still single-threaded to avoid
+   * initialization issues in libgcrypt. */
+  curl_global_init (CURL_GLOBAL_SSL);
+  return (0);
+} /* }}} int cx_init */
+
 void module_register (void)
 {
   plugin_register_complex_config ("curl_xml", cx_config);
+  plugin_register_init ("curl_xml", cx_init);
 } /* void module_register */
 
 /* vim: set sw=2 sts=2 et fdm=marker : */
diff --git a/src/write_http.c b/src/write_http.c
index 62c73b0..04c637b 100644
--- a/src/write_http.c
+++ b/src/write_http.c
@@ -656,9 +656,18 @@ static int wh_config (oconfig_item_t *ci) /* {{{ */
         return (0);
 } /* }}} int wh_config */
 
+static int wh_init (void) /* {{{ */
+{
+  /* Call this while collectd is still single-threaded to avoid
+   * initialization issues in libgcrypt. */
+  curl_global_init (CURL_GLOBAL_SSL);
+  return (0);
+} /* }}} int wh_init */
+
 void module_register (void) /* {{{ */
 {
         plugin_register_complex_config ("write_http", wh_config);
+        plugin_register_init ("write_http", wh_init);
 } /* }}} void module_register */
 
 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */