Use the --socks-proxy option with stratum, changing it to defaulting to socks5 and give appropriate message should it fail to connect.

README

@@ -185,7 +185,7 @@ Options for both config file and command line:
 --scrypt            Use the scrypt algorithm for mining (litecoin only)
 --sharelog <arg>    Append share log to file
 --shares <arg>      Quit after mining N shares (default: unlimited)
---socks-proxy <arg> Set socks4 proxy (host:port) for all pools without a proxy specified
+--socks-proxy <arg> Set socks proxy (host:port) for all pools without a proxy specified
 --syslog            Use system log for output messages (default: standard error)
 --temp-cutoff <arg> Temperature where a device will be automatically disabled, one value or comma separated list (default: 95)
 --text-only|-T      Disable ncurses formatted screen output

cgminer.c

@@ -1249,7 +1249,7 @@ static struct opt_table opt_config_table[] = {
 		     "Quit after mining N shares (default: unlimited)"),
 	OPT_WITH_ARG("--socks-proxy",
 		     opt_set_charp, NULL, &opt_socks_proxy,
-		     "Set socks4 proxy (host:port)"),
+		     "Set socks proxy (host:port)"),
 #ifdef HAVE_SYSLOG_H
 	OPT_WITHOUT_ARG("--syslog",
 			opt_set_bool, &use_syslog,

util.c

@@ -347,7 +347,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 		curl_easy_setopt(curl, CURLOPT_PROXYTYPE, pool->rpc_proxytype);
 	} else if (opt_socks_proxy) {
 		curl_easy_setopt(curl, CURLOPT_PROXY, opt_socks_proxy);
-		curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
+		curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 	}
 	if (userpass) {
 		curl_easy_setopt(curl, CURLOPT_USERPWD, userpass);
@@ -1870,6 +1870,12 @@ static bool setup_stratum_socket(struct pool *pool)
 	hints->ai_socktype = SOCK_STREAM;
 	servinfo = &servinfobase;
 	p = &pbase;
+	if (!pool->rpc_proxy && opt_socks_proxy) {
+		pool->rpc_proxy = opt_socks_proxy;
+		extract_sockaddr(pool->rpc_proxy, &pool->sockaddr_proxy_url, &pool->sockaddr_proxy_port);
+		pool->rpc_proxytype = CURLPROXY_SOCKS5;
+	}
+
 	if (pool->rpc_proxy) {
 		sockaddr_url = pool->sockaddr_proxy_url;
 		sockaddr_port = pool->sockaddr_proxy_port;
@@ -1905,8 +1911,8 @@ static bool setup_stratum_socket(struct pool *pool)
 		break;
 	}
 	if (p == NULL) {
-		applog(LOG_INFO, "Failed to find a stratum servinfo on %s:%s",
+		applog(LOG_NOTICE, "Failed to connect to stratum on %s:%s",
-		       pool->sockaddr_url, pool->stratum_port);
+		       sockaddr_url, sockaddr_port);
 		freeaddrinfo(servinfo);
 		return false;
 	}