fix client cert file loading problem

README.md

@@ -42,7 +42,7 @@ It's fully compatible with the Trojan protocol and configuration file, so that y
 
 ### Easy to use
 
-Trojan-go's configuration file format is compatible with Trojan's, while it's being simplyfied. Unspecified fields will be filled in with a default value. You can launch your server and client much more easily. Here's an example:
+Trojan-go's configuration file format is compatible with Trojan's, while it's being simplyfied. Unspecified fields will be filled in with a default value. You can launch your server and client much easier. Here's an example:
 
 server.json
 ```
@@ -76,7 +76,6 @@ client.json
 	    "your_awesome_password"
     ],
     "ssl": {
-        "cert": "your_cert.crt",
         "sni": "your_awesome_domain_name"
     }
 }
@@ -150,11 +149,11 @@ go build
 
 You can cross-compile it by setting up the environment vars, for example
 ```
-GOOS=windows GOARCH=amd64 go build -o trojan-go.exe
+CGO_ENABLE=0 GOOS=windows GOARCH=amd64 go build -o trojan-go.exe
 ```
 
 or
 
 ```
-GOOS=linux GOARCH=arm go build -o trojan-go
+CGO_ENABLE=0 GOOS=linux GOARCH=arm go build -o trojan-go
 ```

README_zh_cn.md

@@ -78,7 +78,6 @@ client.json
 	    "your_awesome_password"
     ],
     "ssl": {
-        "cert": "your_cert.crt",
         "sni": "your_awesome_domain_name"
     }
 }
@@ -90,7 +89,7 @@ Trojan-Go支持的runtype包括（其实和原版是一样的）
 
 - Server
 
-- NAT (透明代理，[参见这里](https://github.com/shadowsocks/shadowsocks-libev/tree/v3.3.1#transparent-proxy))
+- NAT (透明代理，参见[这里](https://github.com/shadowsocks/shadowsocks-libev/tree/v3.3.1#transparent-proxy))
 
 - Forward
 
@@ -144,7 +143,6 @@ client-mux.json
 
 确保你的Golang版本 >= 1.11
 
-
 ```
 git clone https://github.com/p4gefau1t/trojan-go.git
 cd trojan-go
@@ -154,10 +152,10 @@ go build
 Golang支持通过设置环境变量进行交叉编译，例如
 
 ```
-GOOS=windows GOARCH=amd64 go build -o trojan-go.exe
+CGO_ENABLE=0 GOOS=windows GOARCH=amd64 go build -o trojan-go.exe
 ```
 以及
 
 ```
-GOOS=linux GOARCH=arm go build -o trojan-go
+CGO_ENABLE=0 GOOS=linux GOARCH=arm go build -o trojan-go
 ```

conf/parse.go

@@ -56,9 +56,13 @@ func ParseJSON(data []byte) (*GlobalConfig, error) {
 		if len(config.Passwords) == 0 {
 			return nil, common.NewError("no password found")
 		}
+		if config.TLS.CertPath == "" {
+			logger.Warn("cert of the remote server is not specified. using default CA list.")
+			break
+		}
 		serverCertBytes, err := ioutil.ReadFile(config.TLS.CertPath)
 		if err != nil {
-			return nil, err
+			return nil, common.NewError("failed to load cert file").Base(err)
 		}
 		pool := x509.NewCertPool()
 		pool.AppendCertsFromPEM(serverCertBytes)