UNIX网络编程中第一个例子中的问题

执行./configure 报错没有权限

换为 bash ./configure

cd libfree后make报错

vi或vim 进入inet_ntop 添加 #define

cd libroute后make报错没有那个文件或目录

作者说是只有系统支持4.4 BSD风格的routing socket
Linux可以忽略
网上有说添加 if_dl.h到/usr/include/net文件可以make
我是CentOs7的版本 加入后还是报错
报错内容 ：
get_rtaddrs.c:13:42: 错误：‘struct sockaddr’没有名为‘sa_len’的成员
附上if_dl.h

#ifndef __NET_IF_DL_H
#define __NET_IF_DL_H
#ifndef __SYS_W32API_H
//#include <sys/w32api.h> w32api 加上会报错
#endif
#ifndef __SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
struct sockaddr_dl {
u_char sdl_len;
u_char sdl_family;
u_int16_t sdl_index;
u_char sdl_type;
u_char sdl_nlen;
u_char sdl_alen;
u_char sdl_slen;
char sdl_data[12];
};
#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
__BEGIN_DECLS
W32_FUNC void link_addr (const char *,struct sockaddr_dl *);
W32_FUNC char * link_ntoa (const struct sockaddr_dl *);
_END_DECLS
#endif

加上大佬的if_dl.h

/*

• Copyright © 1990, 1993
• The Regents of the University of California. All rights reserved.
• Redistribution and use in source and binary forms, with or without
• modification, are permitted provided that the following conditions
• are met:
• 1. Redistributions of source code must retain the above copyright
• notice, this list of conditions and the following disclaimer.
• 2. Redistributions in binary form must reproduce the above copyright
• notice, this list of conditions and the following disclaimer in the
• documentation and/or other materials provided with the distribution.
• 3. All advertising materials mentioning features or use of this software
• must display the following acknowledgement:
• This product includes software developed by the University of
• California, Berkeley and its contributors.
• 4. Neither the name of the University nor the names of its contributors
• may be used to endorse or promote products derived from this software
• without specific prior written permission.
• THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS >``AS IS’’ AND
• ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
• IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
• ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
• FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
• DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
• OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
• HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
• LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
• OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
• SUCH DAMAGE.
• @(#)if_dl.h 8.1 (Berkeley) 6/10/93
• $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
  */

#ifndef NET_IF_DL_H
#define NET_IF_DL_H

/*

• A Link-Level Sockaddr may specify the interface in one of two
• ways: either by means of a system-provided index number (computed
• anew and possibly differently on every reboot), or by a human-readable
• string such as “il0” (for managerial convenience).
• Census taking actions, such as something akin to SIOCGCONF would return
• both the index and the human name.
• High volume transactions (such as giving a link-level ``from’’ address
• in a recvfrom or recvmsg call) may be likely only to provide the indexed
• form, (which requires fewer copy operations and less space).
• The form and interpretation of the link-level address is purely a matter
• of convention between the device driver and its consumers; however, it is
• expected that all drivers for an interface of a given if_type will agree.
  */

/*

• Structure of a Link-Level sockaddr:
  /
  struct sockaddr_dl {
  u_char sdl_len; / Total length of sockaddr /
  u_char sdl_family; / AF_LINK /
  u_short sdl_index; / if != 0, system given index for interface /
  u_char sdl_type; / interface type /
  u_char sdl_nlen; / interface name length, no trailing 0 reqd. /
  u_char sdl_alen; / link level address length /
  u_char sdl_slen; / link layer selector length /
  char sdl_data[12]; / minimum work area, can be larger;
  contains both if name and ll address /
  u_short sdl_rcf; / source routing control /
  u_short sdl_route[16]; / source routing information */
  };

#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))

#ifndef _KERNEL

#include <sys/cdefs.h>

__BEGIN_DECLS
void link_addr __P((const char *, struct sockaddr_dl *));
char *link_ntoa __P((const struct sockaddr_dl *));
__END_DECLS

#endif /* !_KERNEL */

#endif

执行./daytimetcpcli 127.0.0.1报错connect error: Connection refused

需要打开本地服务器的daytime 功能，操作过程如下：

在daytime-stream中把disable改成 no 的属性。

su
yum install xinetd
vim /etc/xinetd.d/daytime-stream

再重启xinetd即可

service xinetd restart