On Wed, Nov 13, 2013 at 11:22:56PM +0200, Patrik Flykt wrote:
> Print out the event received and possibly also IP related data.
> ---
> src/dhcp/dhcp-example-client.c | 53
> ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 53 insertions(+)
>
> diff --git a/src/dhcp/dhcp-example-client.c b/src/dhcp/dhcp-example-client.c
> index afb7102..3635bd8 100644
> --- a/src/dhcp/dhcp-example-client.c
> +++ b/src/dhcp/dhcp-example-client.c
> @@ -24,6 +24,9 @@
> #include <unistd.h>
> #include <net/ethernet.h>
> #include <errno.h>
> +#include <sys/socket.h>
> +#include <netinet/in.h>
> +#include <arpa/inet.h>
>
> #include "client.h"
>
> @@ -79,6 +82,52 @@ static int get_index(char *ifname)
> return ifr.ifr_ifindex;
> }
>
> +static const char *print_event(int event)
Can this be called event_to_string?
> +{
> + if (event < 0)
> + return strerror(-event);
> +
> + switch (event) {
> + case DHCP_EVENT_STOP:
> + return "Stopped";
> + case DHCP_EVENT_NAK:
> + return "DHCP NAK";
> + case DHCP_EVENT_IP_ACQUIRE:
> + return "DHCP address acquired";
> + case DHCP_EVENT_IP_CHANGE:
> + return "DHCP address changed";
> + case DHCP_EVENT_EXPIRED:
> + return "DHCP lease expired";
> + default:
> + break;
> + }
> +
> + return "unknown";
> +}
> +
> +static void print_state(DHCPClient *client, int event, void *userdata)
> +{
> + sd_event *e = userdata;
> + struct in_addr addr;
> +
> + if (event < 0) {
> + printf("Error %d %s\n", event, print_event(event));
> + sd_event_unref(e);
> + return;
> + }
So e is unrefed only sometimes... This seems confusing.
> +
> + printf("Event %s\n", print_event(event));
> +
> + if (dhcp_client_get_address(client, &addr) >= 0)
> + printf("Address %s\n", inet_ntoa(addr));
> +
> + if (dhcp_client_get_netmask(client, &addr) >= 0)
> + printf("Netmask %s\n", inet_ntoa(addr));
> +
> + if (dhcp_client_get_router(client, &addr) >= 0)
> + printf("Default router %s\n", inet_ntoa(addr));
> +}
> +
> int main(int argc, char **argv)
> {
> DHCPClient *client;
> @@ -109,9 +158,13 @@ int main(int argc, char **argv)
> printf("Interface %s index %d\n", argv[1], index);
> dhcp_client_set_index(client, index);
> dhcp_client_set_mac(client, &mac);
> + dhcp_client_set_callback(client, print_state, &event);
>
> dhcp_client_start(client);
> sd_event_loop(event);
>
> + dhcp_client_free(client);
> + printf("Exit\n");
> +
> return 0;
> }
Hm, since this is just example code, then probably it doesn't matter that
much :)
Zbyszek
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