实验四 Web服务器2

试验任务
基于华为鲲鹏云服务器CentOS中（或Ubuntu），使用Linux Socket实现：
1. Web服务器的客户端服务器，提交程序运行截图
2. 实现GET即可，请求，响应要符合HTTP协议规范
3. 服务器部署到华为云服务器，浏览器用本机的
4. 把服务器部署到试验箱。（加分项）
实验过程

copy.c

#include <stdio.h>

static char copybuf[16384];

extern int TIMEOUT;

int copy(FILE *read_f, FILE *write_f)
{
  int n;
  int wrote;
  alarm(TIMEOUT);
  while (n = fread(copybuf,1,sizeof(copybuf),read_f)) {
    alarm(TIMEOUT);
    wrote = fwrite(copybuf,n,1,write_f);
    alarm(TIMEOUT);
    if (wrote < 1)
    	return -1;
  }
  alarm(0);
  return 0;
}

 httpd.c

#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

int KEY_QUIT=0;
int TIMEOUT=30;

#ifndef O_BINARY
#define O_BINARY 0
#endif

char referrer[128];
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(0);
  return(0);
}

int DoJpeg(FILE *f, char *name)
{
  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(0);
    return -1;
  }
 
  PrintHeader(f,'j');    

 
  copy(infile,f); /* prints the page */
 
  alarm(TIMEOUT);
  fclose(infile);
  alarm(0);
 
  return 0;
}

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(0);
    return -1;
  }
  
  PrintHeader(f,'g');

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

  alarm(TIMEOUT);
  fclose(infile);
  alarm(0);
  
  return 0;
}

int DoDir(FILE *f, char *name)
{
  char *buf;
  DIR * dir;
  struct dirent * dirent;

  if ((dir = opendir(name))== 0) {
    fprintf(stderr, "Unable to open directory %s, %d\n", name, errno);
    fflush(f);
    return -1;
  }
  
  PrintHeader(f,'h');
  
  alarm(TIMEOUT);
  fprintf(f, "<H1>Index of %s</H1>\n\n",name);
  alarm(0);

  if (name[strlen(name)-1] != '/') {
    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(0);
  }
  
  closedir(dir);
  return 0;
}

int DoHTML(FILE *f, char *name)
{
  char *buf;
  FILE *infile;
  int count;
  char * dir = 0;

  if (!(infile = fopen(name,"r"))) {
    alarm(TIMEOUT);
    fprintf(stderr, "Unable to open HTML file %s, %d\n", name, errno);
    fflush(f);
    alarm(0);
    return -1;
  }

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

  alarm(TIMEOUT);
  fclose(infile);
  alarm(0);

  return 0;
}

int DoText(FILE *f, char *name)
{
  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(0);
    return -1;
  }

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

  alarm(TIMEOUT);
  fclose(infile);
  alarm(0);

  return 0;
}

int ParseReq(FILE *f, char *r)
{
      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 = 0;
          arg = r+1;
          if (e = strchr(arg,' ')) 
        {
              *e = '\0';
          }
      } else 
    {
          arg = 0;
          *r = 0;
    }
  
      c = bp;

/*zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz*/    
      if (c[0] == 0x20){
        c[0]='.';
        c[1]='\0'; 
    }
/*zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz*/    
    if(c[0] == '\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);
            }
        }
        else if (!strcmp(r - 4, ".gif"))
              DoGif(f,c);
        else if (!strcmp(r - 4, ".jpg") || !strcmp(r - 5, ".jpeg"))
              DoJpeg(f,c);
        else if (!strcmp(r - 4, ".htm") || !strcmp(r - 5, ".html"))
            DoHTML(f,c);
             else
                  DoText(f,c);
    } 
    else{
          PrintHeader(f,'h');
          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(0);
    }
      return 0;
}

void sigalrm(int signo)
{
    /* got an alarm, exit & recycle */
    exit(0);
}

int HandleConnect(int fd)
{
  FILE *f;

  char buf[160];
  char buf1[160];

  f = fdopen(fd,"a+");
  if (!f) {
    fprintf(stderr, "httpd: Unable to open httpd input fd, error %d\n", errno);
    alarm(TIMEOUT);
    close(fd);
    alarm(0);
    return 0;
  }
  setbuf(f, 0);

  alarm(TIMEOUT);

  if (!fgets(buf, 150, f)) {
    fprintf(stderr, "httpd: Error reading connection, error %d\n", errno);
    fclose(f);
    alarm(0);
    return 0;
  }
#ifdef DEBUG
      printf("buf = '%s'\n", buf);
#endif
    
      alarm(0);

      referrer[0] = '\0';
      content_length = -1;
    
     alarm(TIMEOUT);
    //read other line to parse Rrferrer and content_length infomation
    while (fgets(buf1, 150, f) && (strlen(buf1) > 2)) {
          alarm(TIMEOUT);
        #ifdef DEBUG
            printf("Got buf1 '%s'\n", buf1);
        #endif
        if (!strncasecmp(buf1, "Referer:", 8)) {
              char * c = buf1+8;
              while (isspace(*c))
                c++;
            strcpy(referrer, c);
        } 
        else if (!strncasecmp(buf1, "Referrer:", 9)) {
              char * c = buf1+9;
              while (isspace(*c))
                c++;
              strcpy(referrer, c);
        } 
        else if (!strncasecmp(buf1, "Content-length:", 15)) {
              content_length = atoi(buf1+15);
        } 
      }
      alarm(0);
  
      if (ferror(f)) {
        fprintf(stderr, "http: Error continuing reading connection, error %d\n", errno);
        fclose(f);
        return 0;
      }    
    
      ParseReq(f, buf);

      alarm(TIMEOUT);
      fflush(f);
      fclose(f);
      alarm(0);
      return 1;
}



void* key(void* data)
{
    int c;
    for(;;){
        c=getchar();    
        if(c == 'q' || c == 'Q'){
            KEY_QUIT=1;
            exit(10);
            break;
        }
    }
        
}

int main(int argc, char *argv[])
{
  int fd, s;
  int len;
  volatile int true = 1;
  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(".");
  printf("starting httpd...\n");
  printf("press q to quit.\n");
//  chdir("/");

  if (argc > 1 && !strcmp(argv[1], "-i")) {
    /* I'm running from inetd, handle the request on stdin */
    fclose(stderr);
    HandleConnect(0);
    exit(0);
  }

  if((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
    perror("Unable to obtain network");
    exit(1);
  }
  
  if((setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&true, 
         sizeof(true))) == -1) {
    perror("setsockopt failed");
    exit(1);
  }

  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, 
      sizeof(server_sockaddr)) == -1)  {
    perror("Unable to bind socket");
    exit(1);
  }

  if(listen(s, 8*3) == -1) { /* Arbitrary, 8 files/page, 3 clients */
    perror("Unable to listen");
    exit(4);
  }

  
       pthread_create(&th_key, NULL, key, 0);
  /* Wait until producer and consumer finish. */
  printf("wait for connection.\n");    
  while (1) {
      
    len = sizeof(ec);
    if((fd = accept(s, (void *)&ec, &len)) == -1) {
      exit(5);
      close(s);
    }
    HandleConnect(fd);
    
  }
  pthread_join(th_key, &retval);
}

Makefile

TOPDIR = /home/tzy/web/ws/07_httpd/
include $(TOPDIR)Rules.mak
EXTRA_LIBS += -lpthread

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

HTTPD_DOCUMENT_ROOT = /home/stf/web/
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

 Rules.mak

TOPDIR= ..
CROSS = arm-linux-
CC= ${CROSS}gcc
#CC=gcc
#CFLAGS += -g
#LDFLAGS += -static  
EXTRA_LIBS +=
EXP_INSTALL = install -m 755
INSTALL_DIR = /home/syf/web/

 更新了tools工具

 

 

 

 

 

 在华为云上进行相同的步骤，并设置端口为1327，实现截图如下：