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dhcp: Add option to bind the receive socket to a different interface

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This can be useful if the DHCP server runs on the same server. On Linux,
the response is then sent via `lo`, so packets won't be received if both
sockets are bound to e.g. a bridge interface.
This commit is contained in:
Tobias Brunner
2025-01-31 11:20:42 +01:00
parent 00d8c36d6f
commit a50ed3006e
2 changed files with 18 additions and 5 deletions
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src/libcharon/plugins/dhcp/dhcp_socket.c
+8 -5
View File
@@ -716,7 +716,7 @@ dhcp_socket_t *dhcp_socket_create()
},
};
socklen_t addr_len;
char *iface;
char *iface, *iface_receive;
int on = 1, rcvbuf = 0;
#if !defined(__APPLE__) && !defined(__FreeBSD__)
@@ -809,8 +809,11 @@ dhcp_socket_t *dhcp_socket_create()
this->dst = host_create_from_string(lib->settings->get_str(lib->settings,
"%s.plugins.dhcp.server", "255.255.255.255",
lib->ns), DHCP_SERVER_PORT);
iface = lib->settings->get_str(lib->settings, "%s.plugins.dhcp.interface",
NULL, lib->ns);
iface = lib->settings->get_str(lib->settings,
"%s.plugins.dhcp.interface", NULL, lib->ns);
iface_receive = lib->settings->get_str(lib->settings,
"%s.plugins.dhcp.interface_receive", NULL,
lib->ns) ?: iface;
if (!this->dst)
{
DBG1(DBG_CFG, "configured DHCP server address invalid");
@@ -873,8 +876,8 @@ dhcp_socket_t *dhcp_socket_create()
return NULL;
}
this->pf_handler = pf_handler_create("DHCP", iface, receive_dhcp, this,
&dhcp_filter);
this->pf_handler = pf_handler_create("DHCP", iface_receive, receive_dhcp,
this, &dhcp_filter);
if (!this->pf_handler)
{
destroy(this);