gpg: photoid: Move functions from exec.c.
authorNIIBE Yutaka <gniibe@fsij.org>
Thu, 25 Jul 2019 02:21:58 +0000 (11:21 +0900)
committerNIIBE Yutaka <gniibe@fsij.org>
Thu, 25 Jul 2019 02:21:58 +0000 (11:21 +0900)
* g10/exec.c (w32_system): Expose to public.
(exec_write, exec_read, exec_finish, make_tempdir, expand_args): Move
to photoid.c.
* g10/exec.h: Likewise.
* g10/photoid.c (exec_write, exec_read, exec_finish, make_tempdir)
(expand_args): Move here.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
g10/exec.c
g10/exec.h
g10/photoid.c

index 3e5dc27..f63904b 100644 (file)
  * along with this program; if not, see <https://www.gnu.org/licenses/>.
  */
 
-/*
-   FIXME: We should replace most code in this module by our
-   spawn implementation from common/exechelp.c.
- */
-
-
 #include <config.h>
 #include <stdlib.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#ifndef EXEC_TEMPFILE_ONLY
-#include <sys/wait.h>
-#endif
 #ifdef HAVE_DOSISH_SYSTEM
 # ifdef HAVE_WINSOCK2_H
 #  include <winsock2.h>
 # endif
 # include <windows.h>
 #endif
-#include <fcntl.h>
-#include <unistd.h>
 #include <string.h>
-#include <errno.h>
 
 #include "gpg.h"
 #include "options.h"
 #include "../common/i18n.h"
-#include "../common/iobuf.h"
-#include "../common/util.h"
-#include "../common/membuf.h"
-#include "../common/sysutils.h"
 #include "exec.h"
 
 #ifdef NO_EXEC
-int
-exec_write(struct exec_info **info,const char *program,
-              const char *args_in,const char *name,int writeonly,int binary)
-{
-  log_error(_("no remote program execution supported\n"));
-  return GPG_ERR_GENERAL;
-}
-
-int
-exec_read(struct exec_info *info) { return GPG_ERR_GENERAL; }
-int
-exec_finish(struct exec_info *info) { return GPG_ERR_GENERAL; }
-int
-set_exec_path(const char *path) { return GPG_ERR_GENERAL; }
-
-#else /* ! NO_EXEC */
-
+int set_exec_path(const char *path) { return GPG_ERR_GENERAL; }
+#else
 #if defined (_WIN32)
 /* This is a nicer system() for windows that waits for programs to
    return before returning control to the caller.  I hate helpful
    computers. */
-static int
+int
 w32_system(const char *command)
 {
   if (!strncmp (command, "!ShellExecute ", 14))
@@ -197,501 +162,4 @@ set_exec_path(const char *path)
     return 0;
 #endif
 }
-
-/* Makes a temp directory and filenames */
-static int
-make_tempdir(struct exec_info *info)
-{
-  char *tmp=opt.temp_dir,*namein=info->name,*nameout;
-
-  if(!namein)
-    namein=info->flags.binary?"tempin" EXTSEP_S "bin":"tempin" EXTSEP_S "txt";
-
-  nameout=info->flags.binary?"tempout" EXTSEP_S "bin":"tempout" EXTSEP_S "txt";
-
-  /* Make up the temp dir and files in case we need them */
-
-  if(tmp==NULL)
-    {
-#if defined (_WIN32)
-      int err;
-
-      tmp=xmalloc(MAX_PATH+2);
-      err=GetTempPath(MAX_PATH+1,tmp);
-      if(err==0 || err>MAX_PATH+1)
-       strcpy(tmp,"c:\\windows\\temp");
-      else
-       {
-         int len=strlen(tmp);
-
-         /* GetTempPath may return with \ on the end */
-         while(len>0 && tmp[len-1]=='\\')
-           {
-             tmp[len-1]='\0';
-             len--;
-           }
-       }
-#else /* More unixish systems */
-      tmp=getenv("TMPDIR");
-      if(tmp==NULL)
-       {
-         tmp=getenv("TMP");
-         if(tmp==NULL)
-           {
-#ifdef __riscos__
-             tmp="<Wimp$ScrapDir>.GnuPG";
-             mkdir(tmp,0700); /* Error checks occur later on */
-#else
-             tmp="/tmp";
-#endif
-           }
-       }
-#endif
-    }
-
-  info->tempdir=xmalloc(strlen(tmp)+strlen(DIRSEP_S)+10+1);
-
-  sprintf(info->tempdir,"%s" DIRSEP_S "gpg-XXXXXX",tmp);
-
-#if defined (_WIN32)
-  xfree(tmp);
-#endif
-
-  if (!gnupg_mkdtemp(info->tempdir))
-    log_error(_("can't create directory '%s': %s\n"),
-             info->tempdir,strerror(errno));
-  else
-    {
-      info->flags.madedir=1;
-
-      info->tempfile_in=xmalloc(strlen(info->tempdir)+
-                               strlen(DIRSEP_S)+strlen(namein)+1);
-      sprintf(info->tempfile_in,"%s" DIRSEP_S "%s",info->tempdir,namein);
-
-      if(!info->flags.writeonly)
-       {
-         info->tempfile_out=xmalloc(strlen(info->tempdir)+
-                                    strlen(DIRSEP_S)+strlen(nameout)+1);
-         sprintf(info->tempfile_out,"%s" DIRSEP_S "%s",info->tempdir,nameout);
-       }
-    }
-
-  return info->flags.madedir? 0 : GPG_ERR_GENERAL;
-}
-
-/* Expands %i and %o in the args to the full temp files within the
-   temp directory. */
-static int
-expand_args(struct exec_info *info,const char *args_in)
-{
-  const char *ch = args_in;
-  membuf_t command;
-
-  info->flags.use_temp_files=0;
-  info->flags.keep_temp_files=0;
-
-  if(DBG_EXTPROG)
-    log_debug("expanding string \"%s\"\n",args_in);
-
-  init_membuf (&command, 100);
-
-  while(*ch!='\0')
-    {
-      if(*ch=='%')
-       {
-         char *append=NULL;
-
-         ch++;
-
-         switch(*ch)
-           {
-           case 'O':
-             info->flags.keep_temp_files=1;
-             /* fall through */
-
-           case 'o': /* out */
-             if(!info->flags.madedir)
-               {
-                 if(make_tempdir(info))
-                   goto fail;
-               }
-             append=info->tempfile_out;
-             info->flags.use_temp_files=1;
-             break;
-
-           case 'I':
-             info->flags.keep_temp_files=1;
-             /* fall through */
-
-           case 'i': /* in */
-             if(!info->flags.madedir)
-               {
-                 if(make_tempdir(info))
-                   goto fail;
-               }
-             append=info->tempfile_in;
-             info->flags.use_temp_files=1;
-             break;
-
-           case '%':
-             append="%";
-             break;
-           }
-
-         if(append)
-            put_membuf_str (&command, append);
-       }
-      else
-        put_membuf (&command, ch, 1);
-
-      ch++;
-    }
-
-  put_membuf (&command, "", 1);  /* Terminate string.  */
-
-  info->command = get_membuf (&command, NULL);
-  if (!info->command)
-    return gpg_error_from_syserror ();
-
-  if(DBG_EXTPROG)
-    log_debug("args expanded to \"%s\", use %u, keep %u\n",info->command,
-             info->flags.use_temp_files,info->flags.keep_temp_files);
-
-  return 0;
-
- fail:
-  xfree (get_membuf (&command, NULL));
-  return GPG_ERR_GENERAL;
-}
-
-/* Either handles the tempfile creation, or the fork/exec.  If it
-   returns ok, then info->tochild is a FILE * that can be written to.
-   The rules are: if there are no args, then it's a fork/exec/pipe.
-   If there are args, but no tempfiles, then it's a fork/exec/pipe via
-   shell -c.  If there are tempfiles, then it's a system. */
-
-int
-exec_write(struct exec_info **info,const char *program,
-           const char *args_in,const char *name,int writeonly,int binary)
-{
-  int ret = GPG_ERR_GENERAL;
-
-  if(opt.exec_disable && !opt.no_perm_warn)
-    {
-      log_info(_("external program calls are disabled due to unsafe "
-                "options file permissions\n"));
-
-      return ret;
-    }
-
-#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
-  /* There should be no way to get to this spot while still carrying
-     setuid privs.  Just in case, bomb out if we are. */
-  if ( getuid () != geteuid ())
-    BUG ();
-#endif
-
-  if(program==NULL && args_in==NULL)
-    BUG();
-
-  *info=xmalloc_clear(sizeof(struct exec_info));
-
-  if(name)
-    (*info)->name=xstrdup(name);
-  (*info)->flags.binary=binary;
-  (*info)->flags.writeonly=writeonly;
-
-  /* Expand the args, if any */
-  if(args_in && expand_args(*info,args_in))
-    goto fail;
-
-#ifdef EXEC_TEMPFILE_ONLY
-  if(!(*info)->flags.use_temp_files)
-    {
-      log_error(_("this platform requires temporary files when calling"
-                 " external programs\n"));
-      goto fail;
-    }
-
-#else /* !EXEC_TEMPFILE_ONLY */
-
-  /* If there are no args, or there are args, but no temp files, we
-     can use fork/exec/pipe */
-  if(args_in==NULL || (*info)->flags.use_temp_files==0)
-    {
-      int to[2],from[2];
-
-      if(pipe(to)==-1)
-       goto fail;
-
-      if(pipe(from)==-1)
-       {
-         close(to[0]);
-         close(to[1]);
-         goto fail;
-       }
-
-      if(((*info)->child=fork())==-1)
-       {
-         close(to[0]);
-         close(to[1]);
-         close(from[0]);
-         close(from[1]);
-         goto fail;
-       }
-
-      if((*info)->child==0)
-       {
-         char *shell=getenv("SHELL");
-
-         if(shell==NULL)
-           shell="/bin/sh";
-
-         /* I'm the child */
-
-         /* If the program isn't going to respond back, they get to
-             keep their stdout/stderr */
-         if(!(*info)->flags.writeonly)
-           {
-             /* implied close of STDERR */
-             if(dup2(STDOUT_FILENO,STDERR_FILENO)==-1)
-               _exit(1);
-
-             /* implied close of STDOUT */
-             close(from[0]);
-             if(dup2(from[1],STDOUT_FILENO)==-1)
-               _exit(1);
-           }
-
-         /* implied close of STDIN */
-         close(to[1]);
-         if(dup2(to[0],STDIN_FILENO)==-1)
-           _exit(1);
-
-         if(args_in==NULL)
-           {
-             if(DBG_EXTPROG)
-               log_debug("execlp: %s\n",program);
-
-             execlp(program,program,(void *)NULL);
-           }
-         else
-           {
-             if(DBG_EXTPROG)
-               log_debug("execlp: %s -c %s\n",shell,(*info)->command);
-
-             execlp(shell,shell,"-c",(*info)->command,(void *)NULL);
-           }
-
-         /* If we get this far the exec failed.  Clean up and return. */
-
-         if(args_in==NULL)
-           log_error(_("unable to execute program '%s': %s\n"),
-                     program,strerror(errno));
-         else
-           log_error(_("unable to execute shell '%s': %s\n"),
-                     shell,strerror(errno));
-
-         /* This mimics the POSIX sh behavior - 127 means "not found"
-             from the shell. */
-         if(errno==ENOENT)
-           _exit(127);
-
-         _exit(1);
-       }
-
-      /* I'm the parent */
-
-      close(to[0]);
-
-      (*info)->tochild=fdopen(to[1],binary?"wb":"w");
-      if((*info)->tochild==NULL)
-       {
-          ret = gpg_error_from_syserror ();
-         close(to[1]);
-         goto fail;
-       }
-
-      close(from[1]);
-
-      (*info)->fromchild=iobuf_fdopen(from[0],"r");
-      if((*info)->fromchild==NULL)
-       {
-          ret = gpg_error_from_syserror ();
-         close(from[0]);
-         goto fail;
-       }
-
-      /* fd iobufs are cached! */
-      iobuf_ioctl((*info)->fromchild, IOBUF_IOCTL_NO_CACHE, 1, NULL);
-
-      return 0;
-    }
-#endif /* !EXEC_TEMPFILE_ONLY */
-
-  if(DBG_EXTPROG)
-    log_debug("using temp file '%s'\n",(*info)->tempfile_in);
-
-  /* It's not fork/exec/pipe, so create a temp file */
-  if( is_secured_filename ((*info)->tempfile_in) )
-    {
-      (*info)->tochild = NULL;
-      gpg_err_set_errno (EPERM);
-    }
-  else
-    (*info)->tochild=fopen((*info)->tempfile_in,binary?"wb":"w");
-  if((*info)->tochild==NULL)
-    {
-      ret = gpg_error_from_syserror ();
-      log_error(_("can't create '%s': %s\n"),
-               (*info)->tempfile_in,strerror(errno));
-      goto fail;
-    }
-
-  ret=0;
-
- fail:
-  if (ret)
-    {
-      xfree (*info);
-      *info = NULL;
-    }
-  return ret;
-}
-
-int
-exec_read(struct exec_info *info)
-{
-  int ret = GPG_ERR_GENERAL;
-
-  fclose(info->tochild);
-  info->tochild=NULL;
-
-  if(info->flags.use_temp_files)
-    {
-      if(DBG_EXTPROG)
-       log_debug ("running command: %s\n",info->command);
-
-#if defined (_WIN32)
-      info->progreturn=w32_system(info->command);
-#else
-      info->progreturn=system(info->command);
-#endif
-
-      if(info->progreturn==-1)
-       {
-         log_error(_("system error while calling external program: %s\n"),
-                   strerror(errno));
-         info->progreturn=127;
-         goto fail;
-       }
-
-#if defined(WIFEXITED) && defined(WEXITSTATUS)
-      if(WIFEXITED(info->progreturn))
-       info->progreturn=WEXITSTATUS(info->progreturn);
-      else
-       {
-         log_error(_("unnatural exit of external program\n"));
-         info->progreturn=127;
-         goto fail;
-       }
-#else
-      /* If we don't have the macros, do the best we can. */
-      info->progreturn = (info->progreturn & 0xff00) >> 8;
-#endif
-
-      /* 127 is the magic value returned from system() to indicate
-         that the shell could not be executed, or from /bin/sh to
-         indicate that the program could not be executed. */
-
-      if(info->progreturn==127)
-       {
-         log_error(_("unable to execute external program\n"));
-         goto fail;
-       }
-
-      if(!info->flags.writeonly)
-       {
-         info->fromchild=iobuf_open(info->tempfile_out);
-          if (info->fromchild
-              && is_secured_file (iobuf_get_fd (info->fromchild)))
-            {
-              iobuf_close (info->fromchild);
-              info->fromchild = NULL;
-              gpg_err_set_errno (EPERM);
-            }
-         if(info->fromchild==NULL)
-           {
-              ret = gpg_error_from_syserror ();
-             log_error(_("unable to read external program response: %s\n"),
-                       strerror(errno));
-             goto fail;
-           }
-
-         /* Do not cache this iobuf on close */
-         iobuf_ioctl(info->fromchild, IOBUF_IOCTL_NO_CACHE, 1, NULL);
-       }
-    }
-
-  ret=0;
-
- fail:
-  return ret;
-}
-
-int
-exec_finish(struct exec_info *info)
-{
-  int ret=info->progreturn;
-
-  if(info->fromchild)
-    iobuf_close(info->fromchild);
-
-  if(info->tochild)
-    fclose(info->tochild);
-
-#ifndef EXEC_TEMPFILE_ONLY
-  if(info->child>0)
-    {
-      if(waitpid(info->child,&info->progreturn,0)!=0 &&
-        WIFEXITED(info->progreturn))
-       ret=WEXITSTATUS(info->progreturn);
-      else
-       {
-         log_error(_("unnatural exit of external program\n"));
-         ret=127;
-       }
-    }
-#endif
-
-  if(info->flags.madedir && !info->flags.keep_temp_files)
-    {
-      if(info->tempfile_in)
-       {
-         if(unlink(info->tempfile_in)==-1)
-           log_info(_("WARNING: unable to remove tempfile (%s) '%s': %s\n"),
-                    "in",info->tempfile_in,strerror(errno));
-       }
-
-      if(info->tempfile_out)
-       {
-         if(unlink(info->tempfile_out)==-1)
-           log_info(_("WARNING: unable to remove tempfile (%s) '%s': %s\n"),
-                    "out",info->tempfile_out,strerror(errno));
-       }
-
-      if(rmdir(info->tempdir)==-1)
-       log_info(_("WARNING: unable to remove temp directory '%s': %s\n"),
-                info->tempdir,strerror(errno));
-    }
-
-  xfree(info->command);
-  xfree(info->name);
-  xfree(info->tempdir);
-  xfree(info->tempfile_in);
-  xfree(info->tempfile_out);
-  xfree(info);
-
-  return ret;
-}
 #endif /* ! NO_EXEC */
index 1cb1c72..6b24d1c 100644 (file)
 #ifndef _EXEC_H_
 #define _EXEC_H_
 
-#include <unistd.h>
-#include <stdio.h>
-
-#include "../common/iobuf.h"
-
-struct exec_info
-{
-  int progreturn;
-  struct
-  {
-    unsigned int binary:1;
-    unsigned int writeonly:1;
-    unsigned int madedir:1;
-    unsigned int use_temp_files:1;
-    unsigned int keep_temp_files:1;
-  } flags;
-  pid_t child;
-  FILE *tochild;
-  iobuf_t fromchild;
-  char *command,*name,*tempdir,*tempfile_in,*tempfile_out;
-};
-
-int exec_write(struct exec_info **info,const char *program,
-              const char *args_in,const char *name,int writeonly,int binary);
-int exec_read(struct exec_info *info);
-int exec_finish(struct exec_info *info);
 int set_exec_path(const char *path);
+int w32_system(const char *command);
 
 #endif /* !_EXEC_H_ */
index 6d7ef7c..a68f434 100644 (file)
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 #ifdef _WIN32
 # ifdef HAVE_WINSOCK2_H
 #  include <winsock2.h>
@@ -295,6 +296,551 @@ get_default_photo_command(void)
 }
 #endif
 
+#ifndef DISABLE_PHOTO_VIEWER
+struct exec_info
+{
+  int progreturn;
+  struct
+  {
+    unsigned int binary:1;
+    unsigned int writeonly:1;
+    unsigned int madedir:1;
+    unsigned int use_temp_files:1;
+    unsigned int keep_temp_files:1;
+  } flags;
+  pid_t child;
+  FILE *tochild;
+  iobuf_t fromchild;
+  char *command,*name,*tempdir,*tempfile_in,*tempfile_out;
+};
+
+#ifdef NO_EXEC
+static int
+exec_write(struct exec_info **info,const char *program,
+              const char *args_in,const char *name,int writeonly,int binary)
+{
+  log_error(_("no remote program execution supported\n"));
+  return GPG_ERR_GENERAL;
+}
+
+static int
+exec_read(struct exec_info *info) { return GPG_ERR_GENERAL; }
+
+static int
+exec_finish(struct exec_info *info) { return GPG_ERR_GENERAL; }
+
+#else /* ! NO_EXEC */
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#ifndef EXEC_TEMPFILE_ONLY
+#include <sys/wait.h>
+#endif
+#include <fcntl.h>
+#include <errno.h>
+
+#include "../common/membuf.h"
+#include "../common/sysutils.h"
+
+/* Makes a temp directory and filenames */
+static int
+make_tempdir(struct exec_info *info)
+{
+  char *tmp=opt.temp_dir,*namein=info->name,*nameout;
+
+  if(!namein)
+    namein=info->flags.binary?"tempin" EXTSEP_S "bin":"tempin" EXTSEP_S "txt";
+
+  nameout=info->flags.binary?"tempout" EXTSEP_S "bin":"tempout" EXTSEP_S "txt";
+
+  /* Make up the temp dir and files in case we need them */
+
+  if(tmp==NULL)
+    {
+#if defined (_WIN32)
+      int err;
+
+      tmp=xmalloc(MAX_PATH+2);
+      err=GetTempPath(MAX_PATH+1,tmp);
+      if(err==0 || err>MAX_PATH+1)
+       strcpy(tmp,"c:\\windows\\temp");
+      else
+       {
+         int len=strlen(tmp);
+
+         /* GetTempPath may return with \ on the end */
+         while(len>0 && tmp[len-1]=='\\')
+           {
+             tmp[len-1]='\0';
+             len--;
+           }
+       }
+#else /* More unixish systems */
+      tmp=getenv("TMPDIR");
+      if(tmp==NULL)
+       {
+         tmp=getenv("TMP");
+         if(tmp==NULL)
+           {
+#ifdef __riscos__
+             tmp="<Wimp$ScrapDir>.GnuPG";
+             mkdir(tmp,0700); /* Error checks occur later on */
+#else
+             tmp="/tmp";
+#endif
+           }
+       }
+#endif
+    }
+
+  info->tempdir=xmalloc(strlen(tmp)+strlen(DIRSEP_S)+10+1);
+
+  sprintf(info->tempdir,"%s" DIRSEP_S "gpg-XXXXXX",tmp);
+
+#if defined (_WIN32)
+  xfree(tmp);
+#endif
+
+  if (!gnupg_mkdtemp(info->tempdir))
+    log_error(_("can't create directory '%s': %s\n"),
+             info->tempdir,strerror(errno));
+  else
+    {
+      info->flags.madedir=1;
+
+      info->tempfile_in=xmalloc(strlen(info->tempdir)+
+                               strlen(DIRSEP_S)+strlen(namein)+1);
+      sprintf(info->tempfile_in,"%s" DIRSEP_S "%s",info->tempdir,namein);
+
+      if(!info->flags.writeonly)
+       {
+         info->tempfile_out=xmalloc(strlen(info->tempdir)+
+                                    strlen(DIRSEP_S)+strlen(nameout)+1);
+         sprintf(info->tempfile_out,"%s" DIRSEP_S "%s",info->tempdir,nameout);
+       }
+    }
+
+  return info->flags.madedir? 0 : GPG_ERR_GENERAL;
+}
+
+/* Expands %i and %o in the args to the full temp files within the
+   temp directory. */
+static int
+expand_args(struct exec_info *info,const char *args_in)
+{
+  const char *ch = args_in;
+  membuf_t command;
+
+  info->flags.use_temp_files=0;
+  info->flags.keep_temp_files=0;
+
+  if(DBG_EXTPROG)
+    log_debug("expanding string \"%s\"\n",args_in);
+
+  init_membuf (&command, 100);
+
+  while(*ch!='\0')
+    {
+      if(*ch=='%')
+       {
+         char *append=NULL;
+
+         ch++;
+
+         switch(*ch)
+           {
+           case 'O':
+             info->flags.keep_temp_files=1;
+             /* fall through */
+
+           case 'o': /* out */
+             if(!info->flags.madedir)
+               {
+                 if(make_tempdir(info))
+                   goto fail;
+               }
+             append=info->tempfile_out;
+             info->flags.use_temp_files=1;
+             break;
+
+           case 'I':
+             info->flags.keep_temp_files=1;
+             /* fall through */
+
+           case 'i': /* in */
+             if(!info->flags.madedir)
+               {
+                 if(make_tempdir(info))
+                   goto fail;
+               }
+             append=info->tempfile_in;
+             info->flags.use_temp_files=1;
+             break;
+
+           case '%':
+             append="%";
+             break;
+           }
+
+         if(append)
+            put_membuf_str (&command, append);
+       }
+      else
+        put_membuf (&command, ch, 1);
+
+      ch++;
+    }
+
+  put_membuf (&command, "", 1);  /* Terminate string.  */
+
+  info->command = get_membuf (&command, NULL);
+  if (!info->command)
+    return gpg_error_from_syserror ();
+
+  if(DBG_EXTPROG)
+    log_debug("args expanded to \"%s\", use %u, keep %u\n",info->command,
+             info->flags.use_temp_files,info->flags.keep_temp_files);
+
+  return 0;
+
+ fail:
+  xfree (get_membuf (&command, NULL));
+  return GPG_ERR_GENERAL;
+}
+
+/* Either handles the tempfile creation, or the fork/exec.  If it
+   returns ok, then info->tochild is a FILE * that can be written to.
+   The rules are: if there are no args, then it's a fork/exec/pipe.
+   If there are args, but no tempfiles, then it's a fork/exec/pipe via
+   shell -c.  If there are tempfiles, then it's a system. */
+
+static int
+exec_write(struct exec_info **info,const char *program,
+           const char *args_in,const char *name,int writeonly,int binary)
+{
+  int ret = GPG_ERR_GENERAL;
+
+  if(opt.exec_disable && !opt.no_perm_warn)
+    {
+      log_info(_("external program calls are disabled due to unsafe "
+                "options file permissions\n"));
+
+      return ret;
+    }
+
+#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
+  /* There should be no way to get to this spot while still carrying
+     setuid privs.  Just in case, bomb out if we are. */
+  if ( getuid () != geteuid ())
+    BUG ();
+#endif
+
+  if(program==NULL && args_in==NULL)
+    BUG();
+
+  *info=xmalloc_clear(sizeof(struct exec_info));
+
+  if(name)
+    (*info)->name=xstrdup(name);
+  (*info)->flags.binary=binary;
+  (*info)->flags.writeonly=writeonly;
+
+  /* Expand the args, if any */
+  if(args_in && expand_args(*info,args_in))
+    goto fail;
+
+#ifdef EXEC_TEMPFILE_ONLY
+  if(!(*info)->flags.use_temp_files)
+    {
+      log_error(_("this platform requires temporary files when calling"
+                 " external programs\n"));
+      goto fail;
+    }
+
+#else /* !EXEC_TEMPFILE_ONLY */
+
+  /* If there are no args, or there are args, but no temp files, we
+     can use fork/exec/pipe */
+  if(args_in==NULL || (*info)->flags.use_temp_files==0)
+    {
+      int to[2],from[2];
+
+      if(pipe(to)==-1)
+       goto fail;
+
+      if(pipe(from)==-1)
+       {
+         close(to[0]);
+         close(to[1]);
+         goto fail;
+       }
+
+      if(((*info)->child=fork())==-1)
+       {
+         close(to[0]);
+         close(to[1]);
+         close(from[0]);
+         close(from[1]);
+         goto fail;
+       }
+
+      if((*info)->child==0)
+       {
+         char *shell=getenv("SHELL");
+
+         if(shell==NULL)
+           shell="/bin/sh";
+
+         /* I'm the child */
+
+         /* If the program isn't going to respond back, they get to
+             keep their stdout/stderr */
+         if(!(*info)->flags.writeonly)
+           {
+             /* implied close of STDERR */
+             if(dup2(STDOUT_FILENO,STDERR_FILENO)==-1)
+               _exit(1);
+
+             /* implied close of STDOUT */
+             close(from[0]);
+             if(dup2(from[1],STDOUT_FILENO)==-1)
+               _exit(1);
+           }
+
+         /* implied close of STDIN */
+         close(to[1]);
+         if(dup2(to[0],STDIN_FILENO)==-1)
+           _exit(1);
+
+         if(args_in==NULL)
+           {
+             if(DBG_EXTPROG)
+               log_debug("execlp: %s\n",program);
+
+             execlp(program,program,(void *)NULL);
+           }
+         else
+           {
+             if(DBG_EXTPROG)
+               log_debug("execlp: %s -c %s\n",shell,(*info)->command);
+
+             execlp(shell,shell,"-c",(*info)->command,(void *)NULL);
+           }
+
+         /* If we get this far the exec failed.  Clean up and return. */
+
+         if(args_in==NULL)
+           log_error(_("unable to execute program '%s': %s\n"),
+                     program,strerror(errno));
+         else
+           log_error(_("unable to execute shell '%s': %s\n"),
+                     shell,strerror(errno));
+
+         /* This mimics the POSIX sh behavior - 127 means "not found"
+             from the shell. */
+         if(errno==ENOENT)
+           _exit(127);
+
+         _exit(1);
+       }
+
+      /* I'm the parent */
+
+      close(to[0]);
+
+      (*info)->tochild=fdopen(to[1],binary?"wb":"w");
+      if((*info)->tochild==NULL)
+       {
+          ret = gpg_error_from_syserror ();
+         close(to[1]);
+         goto fail;
+       }
+
+      close(from[1]);
+
+      (*info)->fromchild=iobuf_fdopen(from[0],"r");
+      if((*info)->fromchild==NULL)
+       {
+          ret = gpg_error_from_syserror ();
+         close(from[0]);
+         goto fail;
+       }
+
+      /* fd iobufs are cached! */
+      iobuf_ioctl((*info)->fromchild, IOBUF_IOCTL_NO_CACHE, 1, NULL);
+
+      return 0;
+    }
+#endif /* !EXEC_TEMPFILE_ONLY */
+
+  if(DBG_EXTPROG)
+    log_debug("using temp file '%s'\n",(*info)->tempfile_in);
+
+  /* It's not fork/exec/pipe, so create a temp file */
+  if( is_secured_filename ((*info)->tempfile_in) )
+    {
+      (*info)->tochild = NULL;
+      gpg_err_set_errno (EPERM);
+    }
+  else
+    (*info)->tochild=fopen((*info)->tempfile_in,binary?"wb":"w");
+  if((*info)->tochild==NULL)
+    {
+      ret = gpg_error_from_syserror ();
+      log_error(_("can't create '%s': %s\n"),
+               (*info)->tempfile_in,strerror(errno));
+      goto fail;
+    }
+
+  ret=0;
+
+ fail:
+  if (ret)
+    {
+      xfree (*info);
+      *info = NULL;
+    }
+  return ret;
+}
+
+static int
+exec_read(struct exec_info *info)
+{
+  int ret = GPG_ERR_GENERAL;
+
+  fclose(info->tochild);
+  info->tochild=NULL;
+
+  if(info->flags.use_temp_files)
+    {
+      if(DBG_EXTPROG)
+       log_debug ("running command: %s\n",info->command);
+
+#if defined (_WIN32)
+      info->progreturn=w32_system(info->command);
+#else
+      info->progreturn=system(info->command);
+#endif
+
+      if(info->progreturn==-1)
+       {
+         log_error(_("system error while calling external program: %s\n"),
+                   strerror(errno));
+         info->progreturn=127;
+         goto fail;
+       }
+
+#if defined(WIFEXITED) && defined(WEXITSTATUS)
+      if(WIFEXITED(info->progreturn))
+       info->progreturn=WEXITSTATUS(info->progreturn);
+      else
+       {
+         log_error(_("unnatural exit of external program\n"));
+         info->progreturn=127;
+         goto fail;
+       }
+#else
+      /* If we don't have the macros, do the best we can. */
+      info->progreturn = (info->progreturn & 0xff00) >> 8;
+#endif
+
+      /* 127 is the magic value returned from system() to indicate
+         that the shell could not be executed, or from /bin/sh to
+         indicate that the program could not be executed. */
+
+      if(info->progreturn==127)
+       {
+         log_error(_("unable to execute external program\n"));
+         goto fail;
+       }
+
+      if(!info->flags.writeonly)
+       {
+         info->fromchild=iobuf_open(info->tempfile_out);
+          if (info->fromchild
+              && is_secured_file (iobuf_get_fd (info->fromchild)))
+            {
+              iobuf_close (info->fromchild);
+              info->fromchild = NULL;
+              gpg_err_set_errno (EPERM);
+            }
+         if(info->fromchild==NULL)
+           {
+              ret = gpg_error_from_syserror ();
+             log_error(_("unable to read external program response: %s\n"),
+                       strerror(errno));
+             goto fail;
+           }
+
+         /* Do not cache this iobuf on close */
+         iobuf_ioctl(info->fromchild, IOBUF_IOCTL_NO_CACHE, 1, NULL);
+       }
+    }
+
+  ret=0;
+
+ fail:
+  return ret;
+}
+
+static int
+exec_finish(struct exec_info *info)
+{
+  int ret=info->progreturn;
+
+  if(info->fromchild)
+    iobuf_close(info->fromchild);
+
+  if(info->tochild)
+    fclose(info->tochild);
+
+#ifndef EXEC_TEMPFILE_ONLY
+  if(info->child>0)
+    {
+      if(waitpid(info->child,&info->progreturn,0)!=0 &&
+        WIFEXITED(info->progreturn))
+       ret=WEXITSTATUS(info->progreturn);
+      else
+       {
+         log_error(_("unnatural exit of external program\n"));
+         ret=127;
+       }
+    }
+#endif
+
+  if(info->flags.madedir && !info->flags.keep_temp_files)
+    {
+      if(info->tempfile_in)
+       {
+         if(unlink(info->tempfile_in)==-1)
+           log_info(_("WARNING: unable to remove tempfile (%s) '%s': %s\n"),
+                    "in",info->tempfile_in,strerror(errno));
+       }
+
+      if(info->tempfile_out)
+       {
+         if(unlink(info->tempfile_out)==-1)
+           log_info(_("WARNING: unable to remove tempfile (%s) '%s': %s\n"),
+                    "out",info->tempfile_out,strerror(errno));
+       }
+
+      if(rmdir(info->tempdir)==-1)
+       log_info(_("WARNING: unable to remove temp directory '%s': %s\n"),
+                info->tempdir,strerror(errno));
+    }
+
+  xfree(info->command);
+  xfree(info->name);
+  xfree(info->tempdir);
+  xfree(info->tempfile_in);
+  xfree(info->tempfile_out);
+  xfree(info);
+
+  return ret;
+}
+#endif
+#endif
+
 
 void
 show_photos (ctrl_t ctrl, const struct user_attribute *attrs, int count,