Re: [PATCH v2 4/4] slirp: feature detection for smbd

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 3/9/21 1:27 AM, Joelle van Dyne wrote:
> Replace Windows specific macro with a more generic feature detection
> macro. Allows slirp smb feature to be disabled manually as well.
> 
> Signed-off-by: Joelle van Dyne <j@getutm.app>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> ---
>  configure   | 26 +++++++++++++++++++++++---
>  meson.build |  2 +-
>  net/slirp.c | 16 ++++++++--------
>  3 files changed, 32 insertions(+), 12 deletions(-)
> 
> diff --git a/configure b/configure
> index 34fccaa2ba..8335a3e6a0 100755
> --- a/configure
> +++ b/configure
> @@ -465,6 +465,7 @@ fuse_lseek="auto"
>  multiprocess="auto"
>  
>  malloc_trim="auto"
> +slirp_smbd="auto"
>  
>  # parse CC options second
>  for opt do
> @@ -834,8 +835,6 @@ do
>      fi
>  done
>  
> -: ${smbd=${SMBD-/usr/sbin/smbd}}
> -
>  # Default objcc to clang if available, otherwise use CC
>  if has clang; then
>    objcc=clang
> @@ -1560,6 +1559,10 @@ for opt do
>    ;;
>    --disable-multiprocess) multiprocess="disabled"
>    ;;
> +  --enable-slirp-smbd) slirp_smbd=yes
> +  ;;
> +  --disable-slirp-smbd) slirp_smbd=no
> +  ;;
>    *)
>        echo "ERROR: unknown option $opt"
>        echo "Try '$0 --help' for more information"
> @@ -1913,6 +1916,7 @@ disabled with --disable-FEATURE, default is enabled if available
>    fuse            FUSE block device export
>    fuse-lseek      SEEK_HOLE/SEEK_DATA support for FUSE exports
>    multiprocess    Out of process device emulation support
> +  slirp-smbd      use smbd (at path --smbd=*) in slirp networking
>  
>  NOTE: The object files are built at the place where configure is launched
>  EOF
> @@ -5252,6 +5256,19 @@ case "$slirp" in
>      ;;
>  esac
>  
> +# Check for slirp smbd dupport
> +: ${smbd=${SMBD-/usr/sbin/smbd}}
> +if test "$slirp_smbd" != "no" ; then
> +  if test "$mingw32" = "yes" ; then
> +    if test "$slirp_smbd" = "yes" ; then
> +      error_exit "Host smbd not supported on this platform."
> +    fi
> +    slirp_smbd=no
> +  else
> +    slirp_smbd=yes
> +  fi
> +fi
> +
>  ##########################################
>  # check for usable __NR_keyctl syscall
>  
> @@ -5527,7 +5544,10 @@ fi
>  if test "$guest_agent" = "yes" ; then
>    echo "CONFIG_GUEST_AGENT=y" >> $config_host_mak
>  fi
> -echo "CONFIG_SMBD_COMMAND=\"$smbd\"" >> $config_host_mak
> +if test "$slirp_smbd" = "yes" ; then
> +  echo "CONFIG_SLIRP_SMBD=y" >> $config_host_mak
> +  echo "CONFIG_SMBD_COMMAND=\"$smbd\"" >> $config_host_mak
> +fi
>  if test "$vde" = "yes" ; then
>    echo "CONFIG_VDE=y" >> $config_host_mak
>    echo "VDE_LIBS=$vde_libs" >> $config_host_mak
> diff --git a/meson.build b/meson.build
> index ba0db9fa1f..cad70a8fc5 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -2424,7 +2424,7 @@ summary_info += {'genisoimage':       config_host['GENISOIMAGE']}
>  if targetos == 'windows' and config_host.has_key('CONFIG_GUEST_AGENT')
>    summary_info += {'wixl':            wixl.found() ? wixl.full_path() : false}
>  endif
> -if slirp_opt != 'disabled'
> +if slirp_opt != 'disabled' and 'CONFIG_SLIRP_SMBD' in config_host
>    summary_info += {'smbd':            config_host['CONFIG_SMBD_COMMAND']}
>  endif
>  summary(summary_info, bool_yn: true, section: 'Host binaries')
> diff --git a/net/slirp.c b/net/slirp.c
> index be914c0be0..b3ded2aac1 100644
> --- a/net/slirp.c
> +++ b/net/slirp.c
> @@ -27,7 +27,7 @@
>  #include "net/slirp.h"
>  
>  
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>  #include <pwd.h>
>  #include <sys/wait.h>
>  #endif
> @@ -90,7 +90,7 @@ typedef struct SlirpState {
>      Slirp *slirp;
>      Notifier poll_notifier;
>      Notifier exit_notifier;
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>      gchar *smb_dir;
>  #endif
>      GSList *fwd;
> @@ -103,7 +103,7 @@ static QTAILQ_HEAD(, SlirpState) slirp_stacks =
>  static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
>  static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
>  
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>  static int slirp_smb(SlirpState *s, const char *exported_dir,
>                       struct in_addr vserver_addr, Error **errp);
>  static void slirp_smb_cleanup(SlirpState *s);
> @@ -367,7 +367,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
>      struct in6_addr ip6_prefix;
>      struct in6_addr ip6_host;
>      struct in6_addr ip6_dns;
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>      struct in_addr smbsrv = { .s_addr = 0 };
>  #endif
>      NetClientState *nc;
> @@ -477,7 +477,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
>          return -1;
>      }
>  
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>      if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
>          error_setg(errp, "Failed to parse SMB address");
>          return -1;
> @@ -592,7 +592,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
>              }
>          }
>      }
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>      if (smb_export) {
>          if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
>              goto error;
> @@ -784,7 +784,7 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
>  
>  }
>  
> -#ifndef _WIN32
> +#if defined(CONFIG_SLIRP_SMBD)
>  
>  /* automatic user mode samba server configuration */
>  static void slirp_smb_cleanup(SlirpState *s)
> @@ -899,7 +899,7 @@ static int slirp_smb(SlirpState* s, const char *exported_dir,
>      return 0;
>  }
>  
> -#endif /* !defined(_WIN32) */
> +#endif /* defined(CONFIG_SLIRP_SMBD) */
>  
>  static int guestfwd_can_read(void *opaque)
>  {
>