This commit was manufactured by cvs2svn to create branch

'GNUPG-1-9-BRANCH'.

1 files changed, 619 insertions, 0 deletions

diff --git a/g10/exec.c b/g10/exec.c
new file mode 100644
index 000000000..0278438f6
--- /dev/null
+++ b/g10/exec.c
@@ -0,0 +1,619 @@
+/* exec.c - generic call-a-program code
+ * Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#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
+#include <windows.h>
+#endif
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include "options.h"
+#include "memory.h"
+#include "i18n.h"
+#include "iobuf.h"
+#include "util.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 G10ERR_GENERAL;
+}
+
+int exec_read(struct exec_info *info) { return G10ERR_GENERAL; }
+int exec_finish(struct exec_info *info) { return G10ERR_GENERAL; }
+int set_exec_path(const char *path,int method) { return G10ERR_GENERAL; }
+
+#else /* ! NO_EXEC */
+
+#ifndef HAVE_MKDTEMP
+char *mkdtemp(char *template);
+#endif
+
+#if defined (__MINGW32__)
+/* 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 win_system(const char *command)
+{
+  PROCESS_INFORMATION pi;
+  STARTUPINFO si;
+  char *string;
+
+  /* We must use a copy of the command as CreateProcess modifies this
+     argument. */
+  string=m_strdup(command);
+
+  memset(&pi,0,sizeof(pi));
+  memset(&si,0,sizeof(si));
+  si.cb=sizeof(si);
+
+  if(!CreateProcess(NULL,string,NULL,NULL,FALSE,0,NULL,NULL,&si,&pi))
+    return -1;
+
+  /* Wait for the child to exit */
+  WaitForSingleObject(pi.hProcess,INFINITE);
+
+  CloseHandle(pi.hProcess);
+  CloseHandle(pi.hThread);
+  m_free(string);
+
+  return 0;
+}
+#endif
+
+/* method==0 to replace current $PATH, and 1 to append to current
+   $PATH.  */
+int set_exec_path(const char *path,int method)
+{
+  char *p,*curpath=NULL;
+  size_t curlen=0;
+
+  if(method==1 && (curpath=getenv("PATH")))
+    curlen=strlen(curpath)+1;
+
+  p=m_alloc(5+curlen+strlen(path)+1);
+  strcpy(p,"PATH=");
+
+  if(curpath)
+    {
+      strcat(p,curpath);
+      strcat(p,":");
+    }
+
+  strcat(p,path);
+
+  if(DBG_EXTPROG)
+    log_debug("set_exec_path method %d: %s\n",method,p);
+
+  /* Notice that path is never freed.  That is intentional due to the
+     way putenv() works.  This leaks a few bytes if we call
+     set_exec_path multiple times. */
+
+  if(putenv(p)!=0)
+    return G10ERR_GENERAL;
+  else
+    return 0;
+}
+
+/* Makes a temp directory and filenames */
+static int make_tempdir(struct exec_info *info)
+{
+  char *tmp=opt.temp_dir,*namein=info->name,*nameout;
+
+  if(!namein)
+    namein=info->binary?"tempin" EXTSEP_S "bin":"tempin" EXTSEP_S "txt";
+
+  nameout=info->binary?"tempout" EXTSEP_S "bin":"tempout" EXTSEP_S "txt";
+
+  /* Make up the temp dir and files in case we need them */
+
+  if(tmp==NULL)
+    {
+#if defined (__MINGW32__)
+      tmp=m_alloc(256);
+      if(GetTempPath(256,tmp)==0)
+	strcpy(tmp,"c:\\windows\\temp");
+      else
+	{
+	  int len=strlen(tmp);
+
+	  /* GetTempPath may return with \ on the end */
+	  while(len>0 && tmp[len-1]=='\\')
+	    {
+	      tmp[len-1]='\0';
+	      len--;
+	    }
+	}
+#else /* More unixish systems */
+      tmp=getenv("TMPDIR");
+      if(tmp==NULL)
+	{
+	  tmp=getenv("TMP");
+	  if(tmp==NULL)
+	    {
+#ifdef __riscos__
+	      tmp="<Wimp$ScrapDir>.GnuPG";
+	      mkdir(tmp,0700); /* Error checks occur later on */
+#else
+	      tmp="/tmp";
+#endif
+	    }
+	}
+#endif
+    }
+
+  info->tempdir=m_alloc(strlen(tmp)+strlen(DIRSEP_S)+10+1);
+
+  sprintf(info->tempdir,"%s" DIRSEP_S "gpg-XXXXXX",tmp);
+
+#if defined (__MINGW32__)
+  m_free(tmp);
+#endif
+
+  if(mkdtemp(info->tempdir)==NULL)
+    log_error(_("can't create directory `%s': %s\n"),
+	      info->tempdir,strerror(errno));
+  else
+    {
+      info->madedir=1;
+
+      info->tempfile_in=m_alloc(strlen(info->tempdir)+
+				strlen(DIRSEP_S)+strlen(namein)+1);
+      sprintf(info->tempfile_in,"%s" DIRSEP_S "%s",info->tempdir,namein);
+
+      if(!info->writeonly)
+	{
+	  info->tempfile_out=m_alloc(strlen(info->tempdir)+
+				     strlen(DIRSEP_S)+strlen(nameout)+1);
+	  sprintf(info->tempfile_out,"%s" DIRSEP_S "%s",info->tempdir,nameout);
+	}
+    }
+
+  return info->madedir?0:G10ERR_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;
+  unsigned int size,len;
+
+  info->use_temp_files=0;
+  info->keep_temp_files=0;
+
+  if(DBG_EXTPROG)
+    log_debug("expanding string \"%s\"\n",args_in);
+
+  size=100;
+  info->command=m_alloc(size);
+  len=0;
+  info->command[0]='\0';
+
+  while(*ch!='\0')
+    {
+      if(*ch=='%')
+	{
+	  char *append=NULL;
+
+	  ch++;
+
+	  switch(*ch)
+	    {
+	    case 'O':
+	      info->keep_temp_files=1;
+	      /* fall through */
+
+	    case 'o': /* out */
+	      if(!info->madedir)
+		{
+		  if(make_tempdir(info))
+		    goto fail;
+		}
+	      append=info->tempfile_out;
+	      info->use_temp_files=1;
+	      break;
+
+	    case 'I':
+	      info->keep_temp_files=1;
+	      /* fall through */
+
+	    case 'i': /* in */
+	      if(!info->madedir)
+		{
+		  if(make_tempdir(info))
+		    goto fail;
+		}
+	      append=info->tempfile_in;
+	      info->use_temp_files=1;
+	      break;
+
+	    case '%':
+	      append="%";
+	      break;
+	    }
+
+	  if(append)
+	    {
+	      size_t applen=strlen(append);
+
+	      if(applen+len>size-1)
+		{
+		  if(applen<100)
+		    applen=100;
+
+		  size+=applen;
+		  info->command=m_realloc(info->command,size);
+		}
+
+	      strcat(info->command,append);
+	      len+=strlen(append);
+	    }
+	}
+      else
+	{
+	  if(len==size-1) /* leave room for the \0 */
+	    {
+	      size+=100;
+	      info->command=m_realloc(info->command,size);
+	    }
+
+	  info->command[len++]=*ch;
+	  info->command[len]='\0';
+	}
+
+      ch++;
+    }
+
+  if(DBG_EXTPROG)
+    log_debug("args expanded to \"%s\", use %d, keep %d\n",
+	      info->command,info->use_temp_files,info->keep_temp_files);
+
+  return 0;
+
+ fail:
+
+  m_free(info->command);
+  info->command=NULL;
+
+  return G10ERR_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=G10ERR_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=m_alloc_clear(sizeof(struct exec_info));
+
+  if(name)
+    (*info)->name=m_strdup(name);
+  (*info)->binary=binary;
+  (*info)->writeonly=writeonly;
+
+  /* Expand the args, if any */
+  if(args_in && expand_args(*info,args_in))
+    goto fail;
+
+#ifdef EXEC_TEMPFILE_ONLY
+  if(!(*info)->use_temp_files)
+    {
+      log_error(_("this platform requires temp 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)->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)->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. */
+
+	  log_error(_("unable to execute %s \"%s\": %s\n"),
+		    args_in==NULL?"program":"shell",
+		    args_in==NULL?program: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)
+	{
+	  close(to[1]);
+	  ret=G10ERR_WRITE_FILE;
+	  goto fail;
+	}
+
+      close(from[1]);
+
+      (*info)->fromchild=iobuf_fdopen(from[0],"r");
+      if((*info)->fromchild==NULL)
+	{
+	  close(from[0]);
+	  ret=G10ERR_READ_FILE;
+	  goto fail;
+	}
+
+      /* fd iobufs are cached?! */
+      iobuf_ioctl((*info)->fromchild,3,1,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 */
+  (*info)->tochild=fopen((*info)->tempfile_in,binary?"wb":"w");
+  if((*info)->tochild==NULL)
+    {
+      log_error(_("can't create `%s': %s\n"),
+		(*info)->tempfile_in,strerror(errno));
+      ret=G10ERR_WRITE_FILE;
+      goto fail;
+    }
+
+  ret=0;
+
+ fail:
+  return ret;
+}
+
+int exec_read(struct exec_info *info)
+{
+  int ret=G10ERR_GENERAL;
+
+  fclose(info->tochild);
+  info->tochild=NULL;
+
+  if(info->use_temp_files)
+    {
+      if(DBG_EXTPROG)
+	log_debug("system() command is %s\n",info->command);
+
+#if defined (__MINGW32__)
+      info->progreturn=win_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->writeonly)
+	{
+	  info->fromchild=iobuf_open(info->tempfile_out);
+	  if(info->fromchild==NULL)
+	    {
+	      log_error(_("unable to read external program response: %s\n"),
+			strerror(errno));
+	      ret=G10ERR_READ_FILE;
+	      goto fail;
+	    }
+
+	  /* Do not cache this iobuf on close */
+	  iobuf_ioctl(info->fromchild,3,1,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->madedir && !info->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));
+    }
+
+  m_free(info->command);
+  m_free(info->name);
+  m_free(info->tempdir);
+  m_free(info->tempfile_in);
+  m_free(info->tempfile_out);
+  m_free(info);
+
+  return ret;
+}
+#endif /* ! NO_EXEC */