resolve.c
上传用户:tjescc
上传日期:2021-02-23
资源大小:419k
文件大小:2k
- /* Nessuslib -- the Nessus Library
- * Copyright (C) 1998 Renaud Deraison
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Hostname resolver.
- */
- #define EXPORTING
- #include <includes.h>
- #include "resolve.h"
- #ifndef __u32
- #define __u32 unsigned long
- #endif
- #ifndef INADDR_NONE
- #define INADDR_NONE 0xffffffff
- #endif
- ExtFunc int
- host2ip(name, ip)
- char * name;
- struct in_addr * ip;
- {
- #undef HAVE_GETHOSTBYNAME_R
- #ifdef HAVE_GETHOSTBYNAME_R
- int Errno = 0;
- char * buf = emalloc(4096);
- struct hostent * res = NULL;
- struct hostent * t = NULL;
- struct hostent * myhostent;
-
- myhostent = emalloc(sizeof(struct hostent));
- #undef HAVE_SOLARIS_GETHOSTBYNAME_R
- #ifdef HAVE_SOLARIS_GETHOSTBYNAME_R
- gethostbyname_r(name, myhostent, buf, 4096, &Errno);
- if(Errno){
- efree(&myhostent);
- efree(&buf);
- return -1;
- }
- #else
- gethostbyname_r(name, myhostent, buf, 4096, &res, &Errno);
- t = myhostent;
- myhostent = res;
- #endif /* HAVE_SOLARIS_... */
- memcpy(ip, myhostent->h_addr, myhostent->h_length);
- efree(&myhostent);
- efree(&buf);
- return 0;
- #else
- struct hostent * ent;
- ent = gethostbyname(name);
- if(!ent)
- return -1;
- else if(ip) memcpy(ip, ent->h_addr, ent->h_length);
- return 0; /* success */
- #endif /* defined(GETHOSTBYNAME_R) */
- }
- struct in_addr
- nn_resolve(name)
- const char * name;
- {
- struct in_addr ret;
- if(host2ip(name, &ret) < 0)
- {
- ret.s_addr = INADDR_NONE;
- }
- return ret;
- }