allow configuring the port

[dyn-nsupdate.git] / dyn-nsupdate.cpp

diff --git a/dyn-nsupdate.cpp b/dyn-nsupdate.cpp
index 25381cff5d09219af2cf9c5a5209a83534907eb8..b0a7aed0d8e51185d9838ce64ecff16e79bc2242 100644 (file)
--- a/dyn-nsupdate.cpp
+++ b/dyn-nsupdate.cpp
@@ -9,6 +9,7 @@
 #include <boost/iostreams/stream.hpp>
 
 using namespace boost;
+typedef property_tree::ptree::path_type path;
 
 static void write(int fd, const char *str)
 {
@@ -23,26 +24,31 @@ static void write(int fd, const char *str)
 int main(int argc, const char ** argv)
 {
        static const regex regex_ip("\\d{1,3}.\\d{1,3}.\\d{1,3}.\\d{1,3}");
-       static const regex regex_user("[a-zA-Z]+");
+       static const regex regex_password("[a-zA-Z0-9.:;,_-]+");
+       static const regex regex_domain("[a-zA-Z0-9.]+");
        
        
-       if (argc != 5) {
-               std::cerr << "Usage: " << argv[0] << " <username> <password> <domain> <IP address>" << std::endl;
+       if (argc != 4) {
+               std::cerr << "Usage: " << argv[0] << " <domain> <password> <IP address>" << std::endl;
                return 1;
        }
        
-       /* Obtain and validate inpit */
-       std::string user = argv[1];
+       /* Obtain input */
+       std::string domain = argv[1];
        std::string password = argv[2];
-       std::string domain = argv[3];
-       std::string ip = argv[4];
+       std::string ip = argv[3];
        
+       /* Validate input */
        if (!regex_match(ip, regex_ip)) {
                std::cerr << "Invalid IP address " << ip << "." << std::endl;
                exit(1);
        }
-       if (!regex_match(user, regex_user)) {
-               std::cerr << "Invalid username " << user << "." << std::endl;
+       if (!regex_match(domain, regex_domain)) {
+               std::cerr << "Invalid domain " << domain << "." << std::endl;
+               exit(1);
+       }
+       if (!regex_match(password, regex_password)) {
+               std::cerr << "Invalid password " << password << "." << std::endl;
                exit(1);
        }
        
@@ -50,15 +56,12 @@ int main(int argc, const char ** argv)
        property_tree::ptree config;
        property_tree::ini_parser::read_ini(CONFIG_FILE, config);
        std::string nsupdate = config.get<std::string>("nsupdate");
+       unsigned server_port = config.get<unsigned>("port", 53);
        
-       /* Check username, password, domain */
-       optional<std::string> correct_password = config.get_optional<std::string>(user+".password");
+       /* Given the domain, check whether the password matches */
+       optional<std::string> correct_password = config.get_optional<std::string>(path(domain+"/password", '/'));
        if (!correct_password || *correct_password != password) {
-               std::cerr << "Username or password incorrect." << std::endl;
-               exit(1);
-       }
-       if (config.get<std::string>(user+".domain") != domain) {
-               std::cerr << "Domain incorrect." << std::endl;
+               std::cerr << "Password incorrect." << std::endl;
                exit(1);
        }
        
@@ -77,14 +80,14 @@ int main(int argc, const char ** argv)
        }
        if (child_pid == 0) {
                /* We're in the child */
-               /* Close write end, use read and as stdin */
+               /* Close write end, use read end as stdin */
                close(pipe_ends[1]);
                if (dup2(pipe_ends[0], fileno(stdin)) < 0) {
                        std::cerr << "There was an error redirecting stdin." << std::endl;
                        exit(1);
                }
                /* exec nsupdate */
-               execl(nsupdate.c_str(), nsupdate.c_str(), "-l", (char *)NULL);
+               execl(nsupdate.c_str(), nsupdate.c_str(), "-p", std::to_string(server_port).c_str(), "-l", (char *)NULL);
                /* There was an error */
                std::cerr << "There was an error executing nsupdate." << std::endl;
                exit(1);