add option to bind socket to specified interface (e.g. localhost) only

diff --git a/hmland.c b/hmland.c
index 24fa34e4c28925c674e6871fad856fecfc2eac2c..c3981ab4e912f8f14298f09b84b33e479817793a 100644 (file)
--- a/hmland.c
+++ b/hmland.c
@@ -379,7 +379,7 @@ static int comm(int fd_in, int fd_out, int master_socket)
        return 1;
 }
 
-static int socket_server(int port, int daemon)
+static int socket_server(char *iface, int port, int daemon)
 {
        struct sigaction sact;
        struct sockaddr_in sin;
@@ -423,7 +423,14 @@ static int socket_server(int port, int daemon)
        memset(&sin, 0, sizeof(sin));
        sin.sin_family = AF_INET;
        sin.sin_port = htons(port);
-       sin.sin_addr.s_addr = htonl(INADDR_ANY);
+       if (!iface) {
+               sin.sin_addr.s_addr = htonl(INADDR_ANY);
+       } else {
+               if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
+                       perror("inet_ntop");
+                       return EXIT_FAILURE;
+               }
+       }
 
        if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
                perror("Can't bind socket");
@@ -494,6 +501,7 @@ void hmlan_syntax(char *prog)
        fprintf(stderr, "\t-d\tdaemon mode\n");
        fprintf(stderr, "\t-h\tthis help\n");
        fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
+       fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
        fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
        fprintf(stderr, "\t-v\tverbose mode\n");
 
@@ -502,12 +510,13 @@ void hmlan_syntax(char *prog)
 int main(int argc, char **argv)
 {
        int port = 1000;
+       char *iface = NULL;
        int interactive = 0;
        int daemon = 0;
        char *ep;
        int opt;
 
-       while((opt = getopt(argc, argv, "Ddhip:v")) != -1) {
+       while((opt = getopt(argc, argv, "Ddhip:l:v")) != -1) {
                switch (opt) {
                        case 'D':
                                debug = 1;
@@ -526,6 +535,9 @@ int main(int argc, char **argv)
                                        exit(EXIT_FAILURE);
                                }
                                break;
+                       case 'l':
+                               iface = optarg;
+                               break;
                        case 'v':
                                verbose = 1;
                                break;
@@ -542,6 +554,6 @@ int main(int argc, char **argv)
        if (interactive) {
                return interactive_server();
        } else {
-               return socket_server(port, daemon);
+               return socket_server(iface, port, daemon);
        }
 }