实验5 简单嵌入式WEB服务器实验 实验报告 20135303 20135326

北京电子科技学院（BESTI）

实     验    报     告

课程：信息安全系统设计基础                班级：  1353

姓名：20135303 魏昊卿

学号：20135326 王亦可

成绩：             指导教师： 娄嘉鹏             实验日期：2015.12.03

实验密级：         预习程度：                     实验时间：15:30~18:00

仪器组次：          必修/选修：必修              实验序号：5

实验名称：   2.7简单嵌入式WEB服务器实验

实验目的与要求：         1.掌握在ARM开发板实现一个简单 WEB服务器的过程

2.学习在ARM开发板上的socket网络编程

3.学习linux下的signal（）函数的使用

实验仪器：

名称	型号	数量
计算机		1
嵌入式开发平台	UP-NETARM2410-CL	1

实验内容、步骤与体会：

1.配置实验环境

2.阅读理解实验源码。

　　进入07_httpd文件夹，使用vi编辑器阅读理解源代码。

3.编译应用程序

4.下载调试

使用NFS服务方式将HPPTD下载到开发板上，并拷贝测试用的网页进行调试。（此处忘记截图）

使用如下命令：

mount -t nfs -o nolock 192.168.0.234：/home/bc /host(手册中的指导使用/root/bc /host命令)

进入07_httpd目录后，输入./httpd 命令

5.本机调试

在台式机的浏览器中输入http：//192.168.0.121,观察在客户机的浏览器中的连接请求结果和在开发板上的服务器的打印信息

重要代码：

//makefile
TOPDIR = ../
include $(TOPDIR)Rules.mak
EXTRA_LIBS += -lpthread

EXEC = $(INSTALL_DIR)/httpd  ./httpd
OBJS = httpd.o copy.o

HTTPD_DOCUMENT_ROOT = /mnt/yaffs
CFLAGS += -DHTTPD_DOCUMENT_ROOT=\"$(HTTPD_DOCUMENT_ROOT)\"

all: $(EXEC)

$(EXEC): $(OBJS)
    $(CC) $(LDFLAGS) -o $@ $(OBJS) $(EXTRA_LIBS)

install:
    $(EXP_INSTALL) $(EXEC) $(INSTALL_DIR)

clean:
    -rm -f $(EXEC) *.elf *.gdb *.o

/* httpd.c:  A very simple http server
 * Copyfight (C) 2003      Zou jian guo <ah_zou@163.com>
 * Copyright (C) 2000         Lineo, Inc.  (www.lineo.com)
 * Copyright (c) 1997-1999 D. Jeff Dionne <jeff@lineo.ca>
 * Copyright (c) 1998      Kenneth Albanowski <kjahds@kjahds.com>
 * Copyright (c) 1999      Nick Brok <nick@nbrok.iaehv.nl>
 *
 * This program 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.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <sys/stat.h>
#include <dirent.h>
#include <signal.h>
#include <unistd.h>
#include <ctype.h>
#include "pthread.h"

#define DEBUG

;
;

#ifndef O_BINARY
#define O_BINARY 0
#endif

];
int content_length;

#define SERVER_PORT 80

int PrintHeader(FILE *f, int content_type)
{
  alarm(TIMEOUT);
  fprintf(f,"HTTP/1.0 200 OK\n");
  switch (content_type)
  {
   case 't':
    fprintf(f,"Content-type: text/plain\n");
    break;
   case 'g':
    fprintf(f,"Content-type: image/gif\n");
    break;
   case 'j':
    fprintf(f,"Content-type: image/jpeg\n");
    break;
   case 'h':
    fprintf(f,"Content-type: text/html\n");
    break;
  }
  fprintf(f,"Server: uClinux-httpd 0.2.2\n");
  fprintf(f,"Expires: 0\n");
  fprintf(f,"\n");
  alarm();
  );
}

int DoJpeg(FILE *f, char *name)//发送jpeg图像文件内容
{
  char *buf;
  FILE * infile;
  int count;

  if (!(infile = fopen(name, "r"))) {
    alarm(TIMEOUT);
    fprintf(stderr, "Unable to open JPEG file %s, %d\n", name, errno);
    fflush(f);
    alarm();
    ;
  }

  PrintHeader(f,'j');    

  copy(infile,f); /* prints the page */

  alarm(TIMEOUT);
  fclose(infile);
  alarm();

  ;
}

int DoGif(FILE *f, char *name)
{
  char *buf;
  FILE * infile;
  int count;

  if (!(infile = fopen(name, "r"))) {
    alarm(TIMEOUT);
    fprintf(stderr, "Unable to open GIF file %s, %d\n", name, errno);
    fflush(f);
    alarm();
    ;
  }

  PrintHeader(f,'g');

  copy(infile,f); /* prints the page */  

  alarm(TIMEOUT);
  fclose(infile);
  alarm();

  ;
}

int DoDir(FILE *f, char *name)//发送当前目录文件列表信息
{
  char *buf;
  DIR * dir;
  struct dirent * dirent;

  ) {
    fprintf(stderr, "Unable to open directory %s, %d\n", name, errno);
    fflush(f);
    ;
  }

  PrintHeader(f,'h');

  alarm(TIMEOUT);
  fprintf(f, "<H1>Index of %s</H1>\n\n",name);
  alarm();

  ] != '/') {
    strcat(name, "/");
  }

  while(dirent = readdir(dir)) {
    alarm(TIMEOUT);

    fprintf(f, "<p><a href=\"/%s%s\">%s</a></p>\n", name, dirent->d_name, dirent->d_name);
    alarm();
  }

  closedir(dir);
  ;
}

int DoHTML(FILE *f, char *name)//发送html文件内容
{
  char *buf;
  FILE *infile;
  int count;
  ;

  if (!(infile = fopen(name,"r"))) {
    alarm(TIMEOUT);
    fprintf(stderr, "Unable to open HTML file %s, %d\n", name, errno);
    fflush(f);
    alarm();
    ;
  }

  PrintHeader(f,'h');
  copy(infile,f); /* prints the page */  

  alarm(TIMEOUT);
  fclose(infile);
  alarm();

  ;
}

int DoText(FILE *f, char *name)//发送纯文本文件内容
{
  char *buf;
  FILE *infile;
  int count;

  if (!(infile = fopen(name,"r"))) {
    alarm(TIMEOUT);
    fprintf(stderr, "Unable to open text file %s, %d\n", name, errno);
    fflush(f);
    alarm();
    ;
  }

  PrintHeader(f,'t');
  copy(infile,f); /* prints the page */  

  alarm(TIMEOUT);
  fclose(infile);
  alarm();

  ;
}

int ParseReq(FILE *f, char *r)//解析客户请求
{
      char *bp;
      struct stat stbuf;
      char * arg;
      char * c;
      int e;
      int raw;

#ifdef DEBUG
      printf("req is '%s'\n", r);
#endif

      while(*(++r) != ' ');  /*skip non-white space*/
      while(isspace(*r))
          r++;

      while (*r == '/')
          r++;
      bp = r;

      while(*r && (*(r) != ' ') && (*(r) != '?'))
          r++;

#ifdef DEBUG
      printf("bp='%s' %x, r='%s' \n", bp, *bp,r);
#endif

      if (*r == '?')
      {
          char * e;
          *r = ;
          arg = r+;
          if (e = strchr(arg,' '))
        {
              *e = '\0';
          }
      } else
    {
          arg = ;
          *r = ;
    }

      c = bp;

/*zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz*/
      ] == 0x20){
        c[]='.';
        c[]='\0';
    }
/*zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz*/
    ] == '\0') strcat(c,".");

    if (c && !stat(c, &stbuf))
      {
        if (S_ISDIR(stbuf.st_mode))
        {
            char * end = c + strlen(c);
            strcat(c, "/index.html");
            if (!stat(c, &stbuf))
            {
                DoHTML(f, c);
            }
            else
            {
                  *end = '\0';
                DoDir(f,c);
            }
        }
        , ".gif"))
              DoGif(f,c);
        , , ".jpeg"))
              DoJpeg(f,c);
        , , ".html"))
            DoHTML(f,c);
             else
                  DoText(f,c);
    }
    else{
          PrintHeader(f,'h');//发送http协议数据头
          alarm(TIMEOUT);
          fprintf(f, "<html><head><title>404 File Not Found</title></head>\n");
        fprintf(f, "<body>The requested URL was not found on this server</body></html>\n");
          alarm();
    }
      ;
}

void sigalrm(int signo)
{
    /* got an alarm, exit & recycle */
    exit();
}

int HandleConnect(int fd)
{
  FILE *f;

  ];
  ];

  f = fdopen(fd,"a+");
  if (!f) {
    fprintf(stderr, "httpd: Unable to open httpd input fd, error %d\n", errno);
    alarm(TIMEOUT);
    close(fd);
    alarm();
    ;
  }
  setbuf(f, );

  alarm(TIMEOUT);

  , f)) {
    fprintf(stderr, "httpd: Error reading connection, error %d\n", errno);
    fclose(f);
    alarm();
    ;
  }
#ifdef DEBUG
      printf("buf = '%s'\n", buf);
#endif

      alarm();

      referrer[] = '\0';
      content_length = -;

     alarm(TIMEOUT);
    //read other line to parse Rrferrer and content_length infomation
    , f) && (strlen(buf1) > )) {
          alarm(TIMEOUT);
        #ifdef DEBUG
            printf("Got buf1 '%s'\n", buf1);
        #endif
        )) {
              ;
              while (isspace(*c))
                c++;
            strcpy(referrer, c);
        }
        )) {
              ;
              while (isspace(*c))
                c++;
              strcpy(referrer, c);
        }
        )) {
              content_length = atoi(buf1+);
        }
      }
      alarm();

      if (ferror(f)) {
        fprintf(stderr, "http: Error continuing reading connection, error %d\n", errno);
        fclose(f);
        ;
      }    

      ParseReq(f, buf);

      alarm(TIMEOUT);
      fflush(f);
      fclose(f);
      alarm();
      ;
}

void* key(void* data)
{
    int c;
    for(;;){
        c=getchar();
        if(c == 'q' || c == 'Q'){
            KEY_QUIT=;
            exit();
            break;
        }
    }

}

int main(int argc, char *argv[])
{
  int fd, s;
  int len;
  ;
  struct sockaddr_in ec;
  struct sockaddr_in server_sockaddr;

  pthread_t th_key;
  void * retval;

  signal(SIGCHLD, SIG_IGN);
  signal(SIGPIPE, SIG_IGN);
  signal(SIGALRM, sigalrm);

  chroot(HTTPD_DOCUMENT_ROOT);
  printf("starting httpd...\n");
  printf("press q to quit.\n");
//  chdir("/");

   && !strcmp(argv[], "-i")) {
    /* I'm running from inetd, handle the request on stdin */
    fclose(stderr);
    HandleConnect();
    exit();
  }

  ) {
    perror("Unable to obtain network");
    exit();
  }

  if((setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&true,
         ) {
    perror("setsockopt failed");
    exit();
  }

  server_sockaddr.sin_family = AF_INET;
  server_sockaddr.sin_port = htons(SERVER_PORT);
  server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);

  if(bind(s, (struct sockaddr *)&server_sockaddr,
      )  {
    perror("Unable to bind socket");
    exit();
  }

  *) == -) { /* Arbitrary, 8 files/page, 3 clients */
    perror("Unable to listen");
    exit();
  }

       pthread_create(&th_key, NULL, key, );
  /* Wait until producer and consumer finish. */
  printf("wait for connection.\n");
  ) {

    len = sizeof(ec);
    ) {
      exit();
      close(s);
    }
    HandleConnect(fd);

  }
  pthread_join(th_key, &retval);
}

实验过程中遇到的问题以及解决方案

在使用make编译的过程中出现错误，如下图：

解决方法：

有两种解决办法，其一是服务器代码使用交叉编译器进行编译，客户端代码使用gcc编译），另一种是修改makefile文件。

我们采取的是第二种方法，如下图：