setopt: support certificate options in memory with struct curl_blob

This change introduces a generic way to provide binary data in setopt
options, called BLOBs.

This change introduces these new setopts:

CURLOPT_ISSUERCERT_BLOB, CURLOPT_PROXY_SSLCERT_BLOB,
CURLOPT_PROXY_SSLKEY_BLOB, CURLOPT_SSLCERT_BLOB and CURLOPT_SSLKEY_BLOB.

Reviewed-by: Daniel Stenberg
Closes #5357

1 files changed, 15 insertions, 1 deletions

diff --git a/src/tool_setopt.c b/src/tool_setopt.c
index 494518b6b..9858d49c9 100644
--- a/src/tool_setopt.c
+++ b/src/tool_setopt.c
@@ -683,7 +683,7 @@ CURLcode tool_setopt(CURL *curl, bool str, struct GlobalConfig *config,
     ret = curl_easy_setopt(curl, tag, pval);
 
   }
-  else {
+  else if(tag < CURLOPTTYPE_BLOB) {
     /* Value is expected to be curl_off_t */
     curl_off_t oval = va_arg(arg, curl_off_t);
     msnprintf(buf, sizeof(buf),
@@ -694,6 +694,20 @@ CURLcode tool_setopt(CURL *curl, bool str, struct GlobalConfig *config,
     if(!oval)
       skip = TRUE;
   }
+  else {
+    /* Value is a blob */
+    void *pblob = va_arg(arg, void *);
+
+    /* blobs are never printable */
+    if(pblob) {
+      value = "blobpointer";
+      remark = TRUE;
+    }
+    else
+      skip = TRUE;
+
+    ret = curl_easy_setopt(curl, tag, pblob);
+  }
 
   va_end(arg);