From 4ff0c359ee7e2b002d96a0a1ff70e9577cde3f51 Mon Sep 17 00:00:00 2001
From: leonid-ed <leonid.ed@gmail.com>
Date: Wed, 25 May 2016 18:05:40 +0300
Subject: [PATCH] [code] Added checking on existence of certificate files;

---
 lib/hub.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/hub.c b/lib/hub.c
index 362aafe..f8e2cb1 100644
--- a/lib/hub.c
+++ b/lib/hub.c
@@ -651,10 +651,28 @@ sxhub_t *sxhub_create(void)
 int sxhub_setsslserts(sxhub_t *ssys, const char *rootca,
                             const char *certpem, const char *certkey)
 {
-  int r = ENOMEM;
+  if (!ssys || !rootca || !certpem || !certkey)
+    return EINVAL;
+
+  /* check on existence of certificate files */
+  if (access(rootca, R_OK) == -1) {
+    fprintf(stderr, "Unable to access rootca file ('%s'): ", rootca);
+    perror("");
+    return ENOENT;
+  }
+  if (access(certpem, R_OK) == -1) {
+    fprintf(stderr, "Unable to access certpem file ('%s'): ", certpem);
+    perror("");
+    return ENOENT;
+  }
+  if (access(certkey, R_OK) == -1) {
+    fprintf(stderr, "Unable to access certkey file ('%s'): ", certkey);
+    perror("");
+    return ENOENT;
+  }
 
-  if(!ssys) return EINVAL;
   /* simply copying */
+  int r = ENOMEM;
   if(!(ssys->rootca = strdup(rootca))) return ENOMEM;
   if(!(ssys->certkey = strdup(certkey)))     goto __fail;
   if(!(ssys->certpem = strdup(certpem)))     goto __fail;