Autoselect the device when there is only one

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/ctl.c

@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <unistd.h>
+#include <dirent.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/un.h>
@@ -125,11 +126,35 @@ ctl_create(const char *dir, const char *file)
 int
 ctl_connect(int fd, const char *dir, const char *file)
 {
-    if (fd < 0 || str_empty(dir) || str_empty(file)) {
+    if (fd < 0 || str_empty(dir)) {
         errno = EINVAL;
         return -1;
     }
 
+    if (!file) {
+        DIR *dp = opendir(dir);
+
+        if (!dp)
+            return -1;
+
+        struct dirent *d = NULL;
+
+        while (d = readdir(dp), d) {
+            if (d->d_name[0] == '.')
+                continue;
+
+            if (file) {
+                closedir(dp);
+                errno = ENOENT;
+                return -1;
+            }
+
+            file = &d->d_name[0];
+        }
+
+        closedir(dp);
+    }
+
     struct sockaddr_un sun;
 
     if (ctl_setsun(&sun, dir, file))

src/path.c

@@ -10,11 +10,10 @@
 int
 gt_path(int argc, char **argv)
 {
-    const char *dev = "tun0";
+    const char *dev = NULL;
 
     struct ctl_msg req = {
         .type = CTL_STATE,
-        .path = {.state = MUD_UP},
     }, res = {0};
 
     struct argz pathz[] = {
@@ -26,33 +25,34 @@ gt_path(int argc, char **argv)
     if (argz(pathz, argc, argv))
         return 1;
 
-    if (argz_is_set(pathz, "backup")) {
+    if (!req.path.addr.ss_family) {
+        return 0; // TODO
+    }
+
+    if (argz_is_set(pathz, "up")) {
+        req.path.state = MUD_UP;
+    } else if (argz_is_set(pathz, "backup")) {
         req.path.state = MUD_BACKUP;
     } else if (argz_is_set(pathz, "down")) {
         req.path.state = MUD_DOWN;
+    } else {
+        return 0; // TODO
     }
 
     int fd = ctl_create("/run/" PACKAGE_NAME, NULL);
 
     if (fd == -1) {
-        perror("ctl_create");
+        perror("path");
         return 1;
     }
 
-    if (ctl_connect(fd, "/run/" PACKAGE_NAME, dev) == -1) {
-        gt_log("couldn't connect to %s\n", dev);
+    if ((ctl_connect(fd, "/run/" PACKAGE_NAME, dev) == -1) ||
+        (ctl_reply(fd, &res, &req))) {
+        perror("path");
         ctl_delete(fd);
         return 1;
     }
 
-    int ret = 0;
-
-    if (ctl_reply(fd, &res, &req)) {
-        perror(dev);
-        ret = 1;
-    }
-
     ctl_delete(fd);
-
-    return ret;
+    return 0;
 }

src/set.c

@@ -48,7 +48,7 @@ gt_set_timetolerance(int fd, unsigned long timetolerance)
 int
 gt_set(int argc, char **argv)
 {
-    const char *dev = "tun0";
+    const char *dev = NULL;
     unsigned long timetolerance = 0;
     unsigned long timeout = 0;
     size_t mtu = 0;
@@ -66,12 +66,12 @@ gt_set(int argc, char **argv)
     int fd = ctl_create("/run/" PACKAGE_NAME, NULL);
 
     if (fd == -1) {
-        perror("ctl_create");
+        perror("set");
         return 1;
     }
 
     if (ctl_connect(fd, "/run/" PACKAGE_NAME, dev) == -1) {
-        gt_log("couldn't connect to %s\n", dev);
+        perror("set");
         ctl_delete(fd);
         return 1;
     }