diff mbox series

[Openvpn-devel,S] Change in openvpn[release/2.6]: Warn if pushed options require DHCP

Message ID 22dd9645e6a03528572fdad3c6abcf5501935985-HTML@gerrit.openvpn.net
State Superseded
Headers show
Series [Openvpn-devel,S] Change in openvpn[release/2.6]: Warn if pushed options require DHCP | expand

Commit Message

flichtenheld (Code Review) Nov. 10, 2023, 10:22 a.m. UTC 
Attention is currently required from: flichtenheld, plaisthos.

Hello plaisthos, flichtenheld,

I'd like you to do a code review.
Please visit

    http://gerrit.openvpn.net/c/openvpn/+/424?usp=email

to review the following change.


Change subject: Warn if pushed options require DHCP
......................................................................

Warn if pushed options require DHCP

Some pushed options (such as DOMAIN-SEARCH) require
DHCP server to work. Warn user that some options
will not work if the current driver (such as dco-win)
doesn't support DHCP.

While on it, indicate that "--dns search-domains"
option requires DHCP.

Change-Id: Ie512544329a91fae15409cb18f29d8be617051a1
Signed-off-by: Lev Stipakov <lev@openvpn.net>
---
M src/openvpn/options.c
M src/openvpn/tun.c
2 files changed, 9 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.openvpn.net:29418/openvpn refs/changes/24/424/1
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Patch

diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index e793a96..3b09d3e 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -2483,10 +2483,10 @@ 
 
     if (options->tuntap_options.dhcp_options & DHCP_OPTIONS_DHCP_REQUIRED)
     {
-        const char *prefix = "Some dhcp-options require DHCP server";
+        const char *prefix = "Some dhcp-options (or --dns) require DHCP server";
         if (options->windows_driver != WINDOWS_DRIVER_TAP_WINDOWS6)
         {
-            msg(M_USAGE, "%s, which is not supported by selected %s driver",
+            msg(M_USAGE, "%s, which is not supported by the selected %s driver",
                 prefix, print_windows_driver(options->windows_driver));
         }
         else if (options->tuntap_options.ip_win32_type != IPW32_SET_DHCP_MASQ
diff --git a/src/openvpn/tun.c b/src/openvpn/tun.c
index f857ed1..986134c 100644
--- a/src/openvpn/tun.c
+++ b/src/openvpn/tun.c
@@ -6826,6 +6826,13 @@ 
 open_tun(const char *dev, const char *dev_type, const char *dev_node, struct tuntap *tt,
          openvpn_net_ctx_t *ctx)
 {
+    if ((tt->options.dhcp_options & DHCP_OPTIONS_DHCP_REQUIRED)
+        && tt->windows_driver != WINDOWS_DRIVER_TAP_WINDOWS6)
+    {
+        msg(M_WARN, "Some dhcp-options or --dns require DHCP server, which is not supported by the selected %s driver. Expect them not to work.",
+            print_windows_driver(tt->windows_driver));
+    }
+
     /* dco-win already opened the device, which handle we treat as socket */
     if (tuntap_is_dco_win(tt))
     {