Allow tincctl to connect to something besides localhost.

This would allow tincctl to connect to a remote tincd, or to a local tincd that
isn't listening on localhost, for example if it is using the BindToInterface or
BindToAddress options.

diff --git a/src/tincctl.c b/src/tincctl.c
index ef5233c..93bb465 100644 (file)
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -50,6 +50,7 @@ static char *controlcookiename = NULL;                        /* cookie file location */
 static char controlcookie[1024];
 char *netname = NULL;
 char *confbase = NULL;
+static char *host = NULL;
 
 #ifdef HAVE_MINGW
 static struct WSAData wsa_state;
@@ -57,6 +58,7 @@ static struct WSAData wsa_state;
 
 static struct option const long_options[] = {
        {"config", required_argument, NULL, 'c'},
+       {"host", required_argument, NULL, 'h'},
        {"net", required_argument, NULL, 'n'},
        {"help", no_argument, NULL, 1},
        {"version", no_argument, NULL, 2},
@@ -108,7 +110,7 @@ static bool parse_options(int argc, char **argv) {
        int r;
        int option_index = 0;
 
-       while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
+       while((r = getopt_long(argc, argv, "c:n:h:", long_options, &option_index)) != EOF) {
                switch (r) {
                        case 0:                         /* long option */
                                break;
@@ -117,6 +119,10 @@ static bool parse_options(int argc, char **argv) {
                                confbase = xstrdup(optarg);
                                break;
 
+                       case 'h':                               /* alternative host to connect to */
+                               host = xstrdup(optarg);
+                               break;
+
                        case 'n':                               /* net name given */
                                netname = xstrdup(optarg);
                                break;
@@ -430,7 +436,7 @@ void pcap(int fd, FILE *out) {
 int main(int argc, char *argv[], char *envp[]) {
        int fd;
        int result;
-       int port;
+       char port[128];
        int pid;
 
        program_name = argv[0];
@@ -488,7 +494,7 @@ int main(int argc, char *argv[], char *envp[]) {
                fprintf(stderr, "Could not open control socket cookie file %s: %s\n", controlcookiename, strerror(errno));
                return 1;
        }
-       if(fscanf(f, "%1024s %d %d", controlcookie, &port, &pid) != 3) {
+       if(fscanf(f, "%1024s %128s %d", controlcookie, port, &pid) != 3) {
                fprintf(stderr, "Could not parse control socket cookie file %s\n", controlcookiename);
                return 1;
        }
@@ -500,13 +506,21 @@ int main(int argc, char *argv[], char *envp[]) {
        }
 #endif
 
-       struct sockaddr_in addr;
-       memset(&addr, 0, sizeof addr);
-       addr.sin_family = AF_INET;
-       addr.sin_addr.s_addr = htonl(0x7f000001);
-       addr.sin_port = htons(port);
+       struct addrinfo hints = {
+               .ai_family = AF_UNSPEC,
+               .ai_socktype = SOCK_STREAM,
+               .ai_protocol = IPPROTO_TCP,
+               .ai_flags = 0,
+       };
+
+       struct addrinfo *res = NULL;
 
-       fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+       if(getaddrinfo(host, port, &hints, &res) || !res) {
+               fprintf(stderr, "Cannot resolve %s port %s: %s", host ?: "localhost", port, strerror(errno));
+               return 1;
+       }
+
+       fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
        if(fd < 0) {
                fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
                return 1;
@@ -520,12 +534,14 @@ int main(int argc, char *argv[], char *envp[]) {
        }
 #endif
 
-       if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
+       if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
                        
                fprintf(stderr, "Cannot connect to %s: %s\n", controlcookiename, sockstrerror(sockerrno));
                return 1;
        }
 
+       freeaddrinfo(res);
+
        char line[4096];
        char data[4096];
        int code, version, req;