代码

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>

int KEY_QUIT = 0;
char referrer[128]={0};
int content_length=0;
#define SERVER_PORT 7777
static char copybuf[16384]={0};
#define DEBUG 1

int copy(FILE *read_f, FILE * write_f) //复制文本的API函数copy
{
int n;
int wrote;
n = fread(copybuf,1,sizeof(copybuf),read_f);
wrote = fwrite(copybuf,n,1,write_f);
return 0;
}

int DoHTML(FILE *f, char * name,int fd)
{
FILE *infile;
char buf[1024];
infile = fopen(name,"r"); //打开本地Client端请求的html文件，文件名为name

printf("Sending headers 
");
strcpy(buf, "HTTP/1.0 200 OK
");
send(fd, buf, strlen(buf), 0);
strcpy(buf, "Server: simple httpd/0.1.0
");
send(fd, buf, strlen(buf), 0);
sprintf(buf, "Content-Type: text/html
");
send(fd, buf, strlen(buf), 0);
strcpy(buf, "
");
send(fd, buf, strlen(buf), 0);
printf("Sending mesg...
");
copy(infile,f); //复制Client客户端请求的html文件
printf("Complete sending.
");
fread(copybuf,1,sizeof(copybuf),f);
fclose(infile);
return 0;
}

int ParseReq(FILE *f, char *r,int fd) //分析处理请求文件流当中的内容提取请求的文件名index.html
{
char *bp;
char *c;
#ifdef DEBUG
printf("req is %s", r); //请求的内容例如: GET /index.html HTTP/1.1
#endif
while(*(++r) != ' '); //去掉请求内容开头所有的空格部分
while(isspace(*r)) r++; //判断输入字符是否为空格/回车/制表符等，去掉所有的这些字符
while(*r == '/') r++; //去掉所有的'/'字符
bp = r; //得到文件名的起始指针
while(*r && (*r != ' ') && (*r != '?')) r++;
*r = 0;
c = bp;
printf("The Request FileName is %s
", c);
DoHTML(f, c ,fd); //得到文件名之后处理请求的操作
return 0;
}

int HandleConnect(int fd)
{
FILE *f;
char buf[160];
f = fdopen(fd, "a+"); //打开对应文件名的html文件
setbuf(f, 0); //清楚f文件缓存区
fgets(buf, 150, f); //从Client端请求中获取前面150个字符
#ifdef DEBUG
printf("buf is %s", buf);
#endif
ParseReq(f, buf , fd); //分析请求的内容
fflush(f); //清空文件缓冲区，将其内容写入文件
fclose(f);
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,sockfd;
int len;
volatile int true = 1;
struct sockaddr_in ec;
struct sockaddr_in server_sockaddr;
pthread_t th_key;
printf("Starting httpd...
");
printf("press q to quit..
");

sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,(void*)&true,sizeof(true));
server_sockaddr.sin_family = AF_INET;
server_sockaddr.sin_port = htons(SERVER_PORT);
server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr));
listen(sockfd,8*3);

pthread_create(&th_key,NULL,key,0);

printf("Wait for connection....
");
while(1)
{
len = sizeof(ec);
if((fd=accept(sockfd,(void *)&ec,&len)) == -1)
{
exit(0);
close(sockfd);
}
printf("Handle Connection...
");
HandleConnect(fd);
}
}

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