utils: add lxc_nic_exists()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/lxc_user_nic.c b/src/lxc/lxc_user_nic.c
index c4388a74135593ce362dfaf50f25219c209f3b8e..a2ad03080c8a89c4dd576d244824664aaacd36fa 100644 (file)
--- a/src/lxc/lxc_user_nic.c
+++ b/src/lxc/lxc_user_nic.c
@@ -397,26 +397,6 @@ static char *find_line(char *p, char *e, char *u, char *t, char *l)
        return NULL;
 }
 
-static bool nic_exists(char *nic)
-{
-       char path[MAXPATHLEN];
-       int ret;
-       struct stat sb;
-
-       if (!strcmp(nic, "none"))
-               return true;
-
-       ret = snprintf(path, MAXPATHLEN, "/sys/class/net/%s", nic);
-       if (ret < 0 || (size_t)ret >= MAXPATHLEN)
-               return false;
-
-       ret = stat(path, &sb);
-       if (ret < 0)
-               return false;
-
-       return true;
-}
-
 static int instantiate_veth(char *n1, char **n2)
 {
        int err;
@@ -625,7 +605,7 @@ static bool cull_entries(int fd, char *me, char *t, char *br, char *nicname,
                        continue;
 
                if (nic[0] != '\0')
-                       exists = nic_exists(nic);
+                       exists = lxc_nic_exists(nic);
 
                if (!exists)
                        entry_lines[n - 1].keep = false;

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 0a345adb3844e9c399a63b5d2e1f858de332ed01..07257d29a0f4ae806bbc2c7050e2b30978ff546c 100644 (file)
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -2409,3 +2409,24 @@ bool has_fs_type(const char *path, fs_type_magic magic_val)
 
        return has_type;
 }
+
+bool lxc_nic_exists(char *nic)
+{
+#define __LXC_SYS_CLASS_NET_LEN 15 + IFNAMSIZ + 1
+       char path[__LXC_SYS_CLASS_NET_LEN];
+       int ret;
+       struct stat sb;
+
+       if (!strcmp(nic, "none"))
+               return true;
+
+       ret = snprintf(path, __LXC_SYS_CLASS_NET_LEN, "/sys/class/net/%s", nic);
+       if (ret < 0 || (size_t)ret >= __LXC_SYS_CLASS_NET_LEN)
+               return false;
+
+       ret = stat(path, &sb);
+       if (ret < 0)
+               return false;
+
+       return true;
+}

diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index f0b9bfbba1672be557ed945cfa68145795385708..41f3716e35cca3b0bc087d97594f77df616a34cf 100644 (file)
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -402,5 +402,6 @@ extern void *must_realloc(void *orig, size_t sz);
 typedef __typeof__(((struct statfs *)NULL)->f_type) fs_type_magic;
 extern bool has_fs_type(const char *path, fs_type_magic magic_val);
 extern bool is_fs_type(const struct statfs *fs, fs_type_magic magic_val);
+extern bool lxc_nic_exists(char *nic);
 
 #endif /* __LXC_UTILS_H */