mirror of
git://git.gnupg.org/gnupg.git
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518 lines
11 KiB
C
518 lines
11 KiB
C
/* exec.c - generic call-a-program code
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* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#ifndef EXEC_TEMPFILE_ONLY
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_DOSISH_SYSTEM
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#include <windows.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "options.h"
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#include "memory.h"
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#include "i18n.h"
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#include "iobuf.h"
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#include "util.h"
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#include "exec.h"
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#ifdef NO_EXEC
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int exec_write(struct exec_info **info,const char *program,
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const char *args_in,int writeonly,int binary)
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{
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log_error(_("no remote program execution supported\n"));
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return G10ERR_GENERAL;
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}
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int exec_read(struct exec_info *info) { return G10ERR_GENERAL; }
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int exec_finish(struct exec_info *info) { return G10ERR_GENERAL; }
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#else /* ! NO_EXEC */
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#ifndef HAVE_MKDTEMP
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char *mkdtemp(char *template);
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#endif
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/* Makes a temp directory and filenames */
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static int make_tempdir(struct exec_info *info)
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{
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char *tmp=opt.temp_dir,*name=info->name;
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if(!name)
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name=info->binary?"tempfile" EXTSEP_S "bin":"tempfile" EXTSEP_S "txt";
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/* Make up the temp dir and files in case we need them */
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if(tmp==NULL)
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{
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#if defined (__MINGW32__) || defined (__CYGWIN32__)
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tmp=m_alloc(256);
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if(GetTempPath(256,tmp)==0)
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strcpy(tmp,"c:\\windows\\temp");
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else
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{
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int len=strlen(tmp);
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/* GetTempPath may return with \ on the end */
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while(len>0 && tmp[len-1]=='\\')
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{
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tmp[len-1]='\0';
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len--;
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}
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}
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#else /* More unixish systems */
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tmp=getenv("TMPDIR");
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if(tmp==NULL)
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{
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tmp=getenv("TMP");
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if(tmp==NULL)
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{
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#ifdef __riscos__
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tmp="<Wimp$ScrapDir>.GnuPG";
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mkdir(tmp,0700); /* Error checks occur later on */
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#else
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tmp="/tmp";
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#endif
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}
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}
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#endif
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}
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info->tempdir=m_alloc(strlen(tmp)+strlen(DIRSEP_S)+10+1);
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sprintf(info->tempdir,"%s" DIRSEP_S "gpg-XXXXXX",tmp);
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#if defined (__MINGW32__) || defined (__CYGWIN32__)
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m_free(tmp);
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#endif
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if(mkdtemp(info->tempdir)==NULL)
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log_error(_("%s: can't create directory: %s\n"),
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info->tempdir,strerror(errno));
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else
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{
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info->madedir=1;
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info->tempfile_in=m_alloc(strlen(info->tempdir)+
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strlen(DIRSEP_S)+strlen(name)+1);
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sprintf(info->tempfile_in,"%s" DIRSEP_S "%s",info->tempdir,name);
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if(!info->writeonly)
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{
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info->tempfile_out=m_alloc(strlen(info->tempdir)+
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strlen(DIRSEP_S)+strlen(name)+1);
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sprintf(info->tempfile_out,"%s" DIRSEP_S "%s",info->tempdir,name);
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}
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}
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return info->madedir?0:G10ERR_GENERAL;
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}
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/* Expands %i and %o in the args to the full temp files within the
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temp directory. */
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static int expand_args(struct exec_info *info,const char *args_in)
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{
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const char *ch=args_in;
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int size,len;
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info->use_temp_files=0;
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info->keep_temp_files=0;
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size=100;
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info->command=m_alloc(size);
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len=0;
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info->command[0]='\0';
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while(*ch!='\0')
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{
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if(*ch=='%')
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{
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char *append=NULL;
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ch++;
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switch(*ch)
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{
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case 'O':
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info->keep_temp_files=1;
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/* fall through */
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case 'o': /* out */
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if(!info->madedir)
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{
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if(make_tempdir(info))
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goto fail;
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}
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append=info->tempfile_out;
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info->use_temp_files=1;
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break;
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case 'I':
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info->keep_temp_files=1;
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/* fall through */
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case 'i': /* in */
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if(!info->madedir)
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{
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if(make_tempdir(info))
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goto fail;
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}
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append=info->tempfile_in;
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info->use_temp_files=1;
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break;
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case '%':
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append="%";
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break;
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}
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if(append)
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{
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while(strlen(append)+len>size-1)
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{
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size+=100;
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info->command=m_realloc(info->command,size);
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}
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strcat(info->command,append);
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len+=strlen(append);
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}
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}
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else
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{
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if(len==size-1) /* leave room for the \0 */
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{
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size+=100;
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info->command=m_realloc(info->command,size);
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}
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info->command[len++]=*ch;
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info->command[len]='\0';
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}
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ch++;
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}
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/* printf("args expanded to \"%s\"\n",info->command); */
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return 0;
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fail:
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m_free(info->command);
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info->command=NULL;
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return G10ERR_GENERAL;
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}
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/* Either handles the tempfile creation, or the fork/exec. If it
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returns ok, then info->tochild is a FILE * that can be written to.
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The rules are: if there are no args, then it's a fork/exec/pipe.
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If there are args, but no tempfiles, then it's a fork/exec/pipe via
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shell -c. If there are tempfiles, then it's a system. */
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int exec_write(struct exec_info **info,const char *program,
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const char *args_in,const char *name,int writeonly,int binary)
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{
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int ret=G10ERR_GENERAL;
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if(opt.exec_disable && !opt.no_perm_warn)
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{
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log_info(_("external program calls are disabled due to unsafe "
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"options file permissions\n"));
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return ret;
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}
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#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
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/* There should be no way to get to this spot while still carrying
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setuid privs. Just in case, bomb out if we are. */
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if(getuid()!=geteuid())
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BUG();
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#endif
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if(program==NULL && args_in==NULL)
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BUG();
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*info=m_alloc_clear(sizeof(struct exec_info));
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if(name)
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(*info)->name=m_strdup(name);
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(*info)->binary=binary;
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(*info)->writeonly=writeonly;
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/* Expand the args, if any */
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if(args_in && expand_args(*info,args_in))
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goto fail;
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#ifdef EXEC_TEMPFILE_ONLY
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if(!(*info)->use_temp_files)
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{
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log_error(_("this platform requires temp files when calling external "
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"programs\n"));
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goto fail;
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}
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#else /* !EXEC_TEMPFILE_ONLY */
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/* If there are no args, or there are args, but no temp files, we
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can use fork/exec/pipe */
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if(args_in==NULL || (*info)->use_temp_files==0)
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{
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int to[2],from[2];
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if(pipe(to)==-1)
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goto fail;
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if(pipe(from)==-1)
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{
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close(to[0]);
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close(to[1]);
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goto fail;
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}
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if(((*info)->child=fork())==-1)
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{
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close(to[0]);
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close(to[1]);
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close(from[0]);
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close(from[1]);
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goto fail;
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}
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if((*info)->child==0)
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{
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char *shell=getenv("SHELL");
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if(shell==NULL)
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shell="/bin/sh";
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/* I'm the child */
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/* If the program isn't going to respond back, they get to
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keep their stdout/stderr */
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if(!(*info)->writeonly)
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{
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/* implied close of STDERR */
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if(dup2(STDOUT_FILENO,STDERR_FILENO)==-1)
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_exit(1);
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/* implied close of STDOUT */
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close(from[0]);
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if(dup2(from[1],STDOUT_FILENO)==-1)
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_exit(1);
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}
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/* implied close of STDIN */
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close(to[1]);
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if(dup2(to[0],STDIN_FILENO)==-1)
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_exit(1);
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if(args_in==NULL)
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{
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/* fprintf(stderr,"execing: %s\n",program); */
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execlp(program,program,NULL);
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}
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else
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{
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/* fprintf(stderr,"execing: %s -c %s\n",shell,(*info)->command); */
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execlp(shell,shell,"-c",(*info)->command,NULL);
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}
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/* If we get this far the exec failed. Clean up and return. */
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log_error(_("unable to execute %s \"%s\": %s\n"),
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args_in==NULL?"program":"shell",
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args_in==NULL?program:shell,
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strerror(errno));
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if(errno==ENOENT)
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_exit(127);
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_exit(1);
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}
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/* I'm the parent */
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close(to[0]);
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(*info)->tochild=fdopen(to[1],binary?"wb":"w");
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if((*info)->tochild==NULL)
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{
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close(to[1]);
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ret=G10ERR_WRITE_FILE;
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goto fail;
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}
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close(from[1]);
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(*info)->fromchild=iobuf_fdopen(from[0],"r");
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if((*info)->fromchild==NULL)
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{
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close(from[0]);
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ret=G10ERR_READ_FILE;
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goto fail;
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}
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/* fd iobufs are cached?! */
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iobuf_ioctl((*info)->fromchild,3,1,NULL);
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return 0;
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}
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#endif /* !EXEC_TEMPFILE_ONLY */
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/* It's not fork/exec/pipe, so create a temp file */
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(*info)->tochild=fopen((*info)->tempfile_in,binary?"wb":"w");
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if((*info)->tochild==NULL)
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{
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log_error(_("%s: can't create: %s\n"),
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(*info)->tempfile_in,strerror(errno));
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ret=G10ERR_WRITE_FILE;
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goto fail;
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}
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ret=0;
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fail:
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return ret;
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}
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int exec_read(struct exec_info *info)
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{
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int ret=G10ERR_GENERAL;
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fclose(info->tochild);
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info->tochild=NULL;
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if(info->use_temp_files)
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{
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/* printf("system command is %s\n",info->command); */
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info->progreturn=system(info->command);
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if(info->progreturn==-1)
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{
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log_error(_("system error while calling external program: %s\n"),
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strerror(errno));
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info->progreturn=127;
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goto fail;
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}
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else
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{
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#ifdef WEXITSTATUS
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info->progreturn=WEXITSTATUS(info->progreturn);
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#else
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info->progreturn/=256;
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#endif
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}
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/* 127 is the magic value returned from system() to indicate
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that the shell could not be executed, or from /bin/sh to
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indicate that the program could not be executed. */
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if(info->progreturn==127)
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{
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log_error(_("unable to execute external program\n"));
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goto fail;
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}
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if(!info->writeonly)
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{
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info->fromchild=iobuf_open(info->tempfile_out);
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if(info->fromchild==NULL)
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{
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log_error(_("unable to read external program response: %s\n"),
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strerror(errno));
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ret=G10ERR_READ_FILE;
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goto fail;
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}
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/* Do not cache this iobuf on close */
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iobuf_ioctl(info->fromchild,3,1,NULL);
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}
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}
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ret=0;
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fail:
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return ret;
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}
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int exec_finish(struct exec_info *info)
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{
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int ret=info->progreturn;
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if(info->fromchild)
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iobuf_close(info->fromchild);
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if(info->tochild)
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fclose(info->tochild);
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#ifndef EXEC_TEMPFILE_ONLY
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if(info->child>0)
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{
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if(waitpid(info->child,&info->progreturn,0)!=0 &&
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WIFEXITED(info->progreturn))
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ret=WEXITSTATUS(info->progreturn);
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else
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ret=127;
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}
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#endif
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if(info->madedir && !info->keep_temp_files)
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{
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if(info->tempfile_in)
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{
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if(unlink(info->tempfile_in)==-1)
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log_info(_("Warning: unable to remove tempfile (%s) \"%s\": %s\n"),
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"in",info->tempfile_in,strerror(errno));
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}
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if(info->tempfile_out)
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{
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if(unlink(info->tempfile_out)==-1)
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log_info(_("Warning: unable to remove tempfile (%s) \"%s\": %s\n"),
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"out",info->tempfile_out,strerror(errno));
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}
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if(rmdir(info->tempdir)==-1)
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log_info(_("Warning: unable to remove temp directory \"%s\": %s\n"),
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info->tempdir,strerror(errno));
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}
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m_free(info->command);
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m_free(info->name);
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m_free(info->tempdir);
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m_free(info->tempfile_in);
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m_free(info->tempfile_out);
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m_free(info);
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return ret;
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}
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#endif /* ! NO_EXEC */
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