aboutsummaryrefslogtreecommitdiff
path: root/lib
diff options
context:
space:
mode:
Diffstat (limited to 'lib')
-rw-r--r--lib/url.c91
1 files changed, 40 insertions, 51 deletions
diff --git a/lib/url.c b/lib/url.c
index 3cb7cba0e..d1a7afe1d 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -4853,7 +4853,6 @@ static char *detect_proxy(struct connectdata *conn)
{
char *proxy = NULL;
-#ifndef CURL_DISABLE_HTTP
/* If proxy was not specified, we check for default proxy environment
* variables, to enable i.e Lynx compliance:
*
@@ -4871,62 +4870,46 @@ static char *detect_proxy(struct connectdata *conn)
* For compatibility, the all-uppercase versions of these variables are
* checked if the lowercase versions don't exist.
*/
- char *no_proxy=NULL;
char proxy_env[128];
+ const char *protop = conn->handler->scheme;
+ char *envp = proxy_env;
+ char *prox;
- no_proxy=curl_getenv("no_proxy");
- if(!no_proxy)
- no_proxy=curl_getenv("NO_PROXY");
-
- if(!check_noproxy(conn->host.name, no_proxy)) {
- /* It was not listed as without proxy */
- const char *protop = conn->handler->scheme;
- char *envp = proxy_env;
- char *prox;
+ /* Now, build <protocol>_proxy and check for such a one to use */
+ while(*protop)
+ *envp++ = (char)tolower((int)*protop++);
- /* Now, build <protocol>_proxy and check for such a one to use */
- while(*protop)
- *envp++ = (char)tolower((int)*protop++);
+ /* append _proxy */
+ strcpy(envp, "_proxy");
- /* append _proxy */
- strcpy(envp, "_proxy");
+ /* read the protocol proxy: */
+ prox=curl_getenv(proxy_env);
- /* read the protocol proxy: */
+ /*
+ * We don't try the uppercase version of HTTP_PROXY because of
+ * security reasons:
+ *
+ * When curl is used in a webserver application
+ * environment (cgi or php), this environment variable can
+ * be controlled by the web server user by setting the
+ * http header 'Proxy:' to some value.
+ *
+ * This can cause 'internal' http/ftp requests to be
+ * arbitrarily redirected by any external attacker.
+ */
+ if(!prox && !strcasecompare("http_proxy", proxy_env)) {
+ /* There was no lowercase variable, try the uppercase version: */
+ Curl_strntoupper(proxy_env, proxy_env, sizeof(proxy_env));
prox=curl_getenv(proxy_env);
+ }
- /*
- * We don't try the uppercase version of HTTP_PROXY because of
- * security reasons:
- *
- * When curl is used in a webserver application
- * environment (cgi or php), this environment variable can
- * be controlled by the web server user by setting the
- * http header 'Proxy:' to some value.
- *
- * This can cause 'internal' http/ftp requests to be
- * arbitrarily redirected by any external attacker.
- */
- if(!prox && !strcasecompare("http_proxy", proxy_env)) {
- /* There was no lowercase variable, try the uppercase version: */
- Curl_strntoupper(proxy_env, proxy_env, sizeof(proxy_env));
- prox=curl_getenv(proxy_env);
- }
-
- if(prox)
- proxy = prox; /* use this */
- else {
- proxy = curl_getenv("all_proxy"); /* default proxy to use */
- if(!proxy)
- proxy=curl_getenv("ALL_PROXY");
- }
- } /* if(!check_noproxy(conn->host.name, no_proxy)) - it wasn't specified
- non-proxy */
- free(no_proxy);
-
-#else /* !CURL_DISABLE_HTTP */
-
- (void)conn;
-#endif /* CURL_DISABLE_HTTP */
+ if(prox)
+ proxy = prox; /* use this */
+ else {
+ proxy = curl_getenv("all_proxy"); /* default proxy to use */
+ if(!proxy)
+ proxy=curl_getenv("ALL_PROXY");
+ }
return proxy;
}
@@ -6267,7 +6250,13 @@ static CURLcode create_conn(struct Curl_easy *data,
Curl_safefree(socksproxy);
}
else if(!proxy && !socksproxy)
- proxy = detect_proxy(conn);
+#ifndef CURL_DISABLE_HTTP
+ /* if the host is not in the noproxy list, detect proxy. */
+ if(!check_noproxy(conn->host.name, no_proxy))
+ proxy = detect_proxy(conn);
+#else /* !CURL_DISABLE_HTTP */
+ proxy = NULL;
+#endif /* CURL_DISABLE_HTTP */
Curl_safefree(no_proxy);