qemu/roms/ipxe/src/arch/i386/interface/syslinux/comboot_resolv.c

   1 #include <errno.h>
   2 #include <comboot.h>
   3 #include <ipxe/in.h>
   4 #include <ipxe/list.h>
   5 #include <ipxe/process.h>
   6 #include <ipxe/resolv.h>
   7
   8 FILE_LICENCE ( GPL2_OR_LATER );
   9
  10 struct comboot_resolver {
  11         struct interface intf;
  12         int rc;
  13         struct in_addr addr;
  14 };
  15
  16 static void comboot_resolv_close ( struct comboot_resolver *comboot_resolver,
  17                                    int rc ) {
  18         comboot_resolver->rc = rc;
  19         intf_shutdown ( &comboot_resolver->intf, rc );
  20 }
  21
  22 static void comboot_resolv_done ( struct comboot_resolver *comboot_resolver,
  23                                   struct sockaddr *sa ) {
  24         struct sockaddr_in *sin;
  25
  26         if ( sa->sa_family == AF_INET ) {
  27                 sin = ( ( struct sockaddr_in * ) sa );
  28                 comboot_resolver->addr = sin->sin_addr;
  29         }
  30 }
  31
  32 static struct interface_operation comboot_resolv_op[] = {
  33         INTF_OP ( intf_close, struct comboot_resolver *, comboot_resolv_close ),
  34         INTF_OP ( resolv_done, struct comboot_resolver *, comboot_resolv_done ),
  35 };
  36
  37 static struct interface_descriptor comboot_resolv_desc =
  38         INTF_DESC ( struct comboot_resolver, intf, comboot_resolv_op );
  39
  40 static struct comboot_resolver comboot_resolver = {
  41         .intf = INTF_INIT ( comboot_resolv_desc ),
  42 };
  43
  44 int comboot_resolv ( const char *name, struct in_addr *address ) {
  45         int rc;
  46
  47         comboot_resolver.rc = -EINPROGRESS;
  48         comboot_resolver.addr.s_addr = 0;
  49
  50         if ( ( rc = resolv ( &comboot_resolver.intf, name, NULL ) ) != 0 )
  51                 return rc;
  52
  53         while ( comboot_resolver.rc == -EINPROGRESS )
  54                 step();
  55
  56         if ( ! comboot_resolver.addr.s_addr )
  57                 return -EAFNOSUPPORT;
  58
  59         *address = comboot_resolver.addr;
  60         return comboot_resolver.rc;
  61 }