comboot_resolv.c

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#include <errno.h>
#include <comboot.h>
#include <ipxe/in.h>
#include <ipxe/list.h>
#include <ipxe/process.h>
#include <ipxe/resolv.h>

FILE_LICENCE ( GPL2_OR_LATER );

struct comboot_resolver {
        struct interface intf;
        int rc;
        struct in_addr addr;
};

static void comboot_resolv_close ( struct comboot_resolver *comboot_resolver,
                                   int rc ) {
        comboot_resolver->rc = rc;
        intf_shutdown ( &comboot_resolver->intf, rc );
}

static void comboot_resolv_done ( struct comboot_resolver *comboot_resolver,
                                  struct sockaddr *sa ) {
        struct sockaddr_in *sin;

        if ( sa->sa_family == AF_INET ) {
                sin = ( ( struct sockaddr_in * ) sa );
                comboot_resolver->addr = sin->sin_addr;
        }
}

static struct interface_operation comboot_resolv_op[] = {
        INTF_OP ( intf_close, struct comboot_resolver *, comboot_resolv_close ),
        INTF_OP ( resolv_done, struct comboot_resolver *, comboot_resolv_done ),
};

static struct interface_descriptor comboot_resolv_desc =
        INTF_DESC ( struct comboot_resolver, intf, comboot_resolv_op );

static struct comboot_resolver comboot_resolver = {
        .intf = INTF_INIT ( comboot_resolv_desc ),
};

int comboot_resolv ( const char *name, struct in_addr *address ) {
        int rc;

        comboot_resolver.rc = -EINPROGRESS;
        comboot_resolver.addr.s_addr = 0;

        if ( ( rc = resolv ( &comboot_resolver.intf, name, NULL ) ) != 0 )
                return rc;

        while ( comboot_resolver.rc == -EINPROGRESS )
                step();

        if ( ! comboot_resolver.addr.s_addr )
                return -EAFNOSUPPORT;

        *address = comboot_resolver.addr;
        return comboot_resolver.rc;
}