Add a command to list all tunnels

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

src/common.h

@@ -68,6 +68,7 @@ void     gt_set_port (struct sockaddr *, uint16_t);
 uint16_t gt_get_port (struct sockaddr *);
 int      gt_toaddr   (char *, size_t, struct sockaddr *);
 
+int gt_list   (int, char **);
 int gt_show   (int, char **);
 int gt_bind   (int, char **);
 int gt_path   (int, char **);

src/list.c

@@ -0,0 +1,49 @@
+#include "common.h"
+#include "ctl.h"
+
+#include "../argz/argz.h"
+
+#include <stdio.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/un.h>
+
+int
+gt_list(int argc, char **argv)
+{
+    struct argz showz[] = {
+        {"list", NULL, NULL, argz_option},
+        {NULL}};
+
+    if (argz(showz, argc, argv))
+        return 1;
+
+    char dir[64];
+
+    if (!ctl_rundir(dir, sizeof(dir)))
+        return 0;
+
+    DIR *dp = opendir(dir);
+
+    if (!dp)
+        return 0;
+
+    struct dirent *d = NULL;
+
+    while (d = readdir(dp), d) {
+        if (d->d_name[0] == '.')
+            continue;
+
+        int fd = ctl_connect(d->d_name);
+
+        if (fd < 0)
+            continue;
+
+        printf("%s\n", d->d_name);
+        close(fd);
+    }
+
+    closedir(dp);
+
+    return 0;
+}

src/main.c

@@ -78,7 +78,8 @@ main(int argc, char **argv)
         char *help;
         int (*call)(int, char **);
     } cmd[] = {
-        {"show", "show tunnel info", gt_show},
+        {"list", "list all tunnels", gt_list},
+        {"show", "show tunnel information", gt_show},
         {"bench", "start a crypto bench", gt_bench},
         {"bind", "start a new tunnel", gt_bind},
         {"set", "change tunnel properties", gt_set},