任务详情
基于华为鲲鹏云服务器CentOS中（或Ubuntu），使用Linux Socket实现：
- Web服务器的客户端服务器，提交程序运行截图
- 实现GET即可，请求，响应要符合HTTP协议规范
- 服务器部署到华为云服务器，浏览器用本机的
- 把服务器部署到试验箱。（加分项）
实验过程
本次实验代码上参考的是老师给的代码，通过对代码的修改，更改了部分参数代码得以运行。
关键代码如下：
copy.c
/* copy.c:
*
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
*
* 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>
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
点击查看代码
#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);
}
虚拟机ip：
编译运行：
结果：
服务器部署到华为云服务器，浏览器用本机的
