options: API for meta-data about easy options

 const struct curl_easyoption *curl_easy_option_by_name(const char *name);

 const struct curl_easyoption *curl_easy_option_by_id (CURLoption id);

 const struct curl_easyoption *
 curl_easy_option_next(const struct curl_easyoption *prev);

The purpose is to provide detailed enough information to allow for
example libcurl bindings to get option information at run-time about
what easy options that exist and what arguments they expect.

Assisted-by: Jeroen Ooms
Closes #5365

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/setopt.c b/lib/setopt.c
index 768452ca1..6631c13fe 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -720,6 +720,9 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
     argptr = (char *)va_arg(param, void *);
     if(argptr) {
       struct curl_slist *cl;
+      /* general protection against mistakes and abuse */
+      if(strlen(argptr) > CURL_MAX_INPUT_LENGTH)
+        return CURLE_BAD_FUNCTION_ARGUMENT;
       /* append the cookie file name to the list of file names, and deal with
          them later */
       cl = curl_slist_append(data->change.cookielist, argptr);
@@ -804,6 +807,9 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
         /* if cookie engine was not running, activate it */
         data->cookies = Curl_cookie_init(data, NULL, NULL, TRUE);
 
+      /* general protection against mistakes and abuse */
+      if(strlen(argptr) > CURL_MAX_INPUT_LENGTH)
+        return CURLE_BAD_FUNCTION_ARGUMENT;
       argptr = strdup(argptr);
       if(!argptr || !data->cookies) {
         result = CURLE_OUT_OF_MEMORY;