最近的工作需求client和server使用https协议进行通讯，我负责client编写程序，在操作系统的-depth理解认为一旦前webserver实现，整理代码：
#include"apue.h"
extern char **environ;
void clienterror(int fd,char *cause,char *errnum,char *shortmsg,char *longmsg)
{
char buf[MAXLINE],body[MAXLINE];
sprintf(body,"<html><title>Tiny Error</title>");
sprintf(body,"%s<body bgcolor=""ffffff"">
",body);
sprintf(body,"%s%s:%s
",body,errnum,shortmsg);
sprintf(body,"%s<p>%s:%s
",body,longmsg,cause);
sprintf(body,"%s<hr><em>The tiny Web server</em?
",body);
sprintf(buf,"HTTP/1.0 %s %s
",errnum,shortmsg);
rio_writen(fd,buf,strlen(buf));
sprintf(buf,"Content-type:text/html
");
rio_writen(fd,buf,strlen(buf));
sprintf(buf,"Content-length:%d
",(int)strlen(body));
rio_writen(fd,buf,strlen(buf));
rio_writen(fd,body,strlen(body));
}
void read_requesthdrs(rio_t *rp)
{
char buf[MAXLINE];
rio_readlineb(rp,buf,MAXLINE);
while(strcmp(buf,"
"))
{
rio_readlineb(rp,buf,MAXLINE);
printf("%s",buf);
}
return;
}
int parse_uri(char *uri,char *filename,char *cgiargs)
{
char *ptr;
printf("parse_uri(uri):%s
",uri);
if(!strstr(uri,"cgi-bin"))
{
strcpy(cgiargs,"");
strcpy(filename,".");
strcat(filename,uri);
if(uri[strlen(uri)-1]=='/')
strcat(filename,"home.html");
return 1;
}
else
{
ptr=index(uri,'?');
if(ptr)
{
strcpy(cgiargs,ptr+1);
*ptr=' ';
}
else
strcpy(cgiargs,"");
strcpy(filename,".");
strcat(filename,uri);
return 0;
}
}
void get_filetype(char *filename,char *filetype)
{
if(strstr(filename,".html"))
strcpy(filetype,"text/html");
else if(strstr(filename,".gif"))
strcpy(filetype,"image/gif");
else if(strstr(filename,".jpg"))
strcpy(filetype,"image/jpeg");
else
strcpy(filetype,"text/plain");
}
void serve_dynamic(int fd,char *filename,char *caiargs)
{
char buf[MAXLINE],*emptylist[]={NULL};
sprintf(buf,"HTTP/1.0 200 OK
");
rio_writen(fd,buf,strlen(buf));
sprintf(buf,"Server:Tiny Web Server
");
rio_writen(fd,buf,strlen(buf));
if(fork()==0)
{
setenv("QUERY_STRING",caiargs,1);
dup2(fd,STDOUT_FILENO);
execve(filename,emptylist,environ);
}
wait(NULL);
}
void serve_static(int fd,char *filename,int filesize)
{
int srcfd;
char *srcp,filetype[MAXLINE],buf[MAXLINE];
get_filetype(filename,filetype);
sprintf(buf,"HTTP/1.0 200 OK
");
sprintf(buf,"%sServer:Tiny Web Server
",buf);
sprintf(buf,"%sContent-length:%d
",buf,filesize);
sprintf(buf,"%sContent-type:%s
",buf,filetype);
rio_writen(fd,buf,strlen(buf));
srcfd=open(filename,O_RDONLY,0);
srcp=mmap(0,filesize,PROT_READ,MAP_PRIVATE,srcfd,0);
close(srcfd);
rio_writen(fd,srcp,filesize);
munmap(srcp,filesize);
}
void doit(int fd)
{
int is_static;
struct stat sbuf;
char buf[MAXLINE],method[MAXLINE],uri[MAXLINE],version[MAXLINE];
char filename[MAXLINE],cgiargs[MAXLINE];
rio_t rio;
rio_readinitb(&rio,fd);
rio_readlineb(&rio,buf,MAXLINE);
sscanf(buf,"%s %s %s",method,uri,version);
if(strcasecmp(method,"GET"))
{
clienterror(fd,method,"501","Not implemented","Tiny does not implemented this method");
return;
}
read_requesthdrs(&rio);
is_static=parse_uri(uri,filename,cgiargs);
if(stat(filename,&sbuf)<0)
{
clienterror(fd,filename,"404","Not found","Tiny couldn't find this file");
return;
}
if(is_static)
{
if(!(S_ISREG(sbuf.st_mode))||!(S_IRUSR&sbuf.st_mode))
{
clienterror(fd,filename,"403","Forbidden","Tiny could't read the file");
return;
}
serve_static(fd,filename,sbuf.st_size);
}
else
{
if(!(S_ISREG(sbuf.st_mode))|!(S_IXUSR&sbuf.st_mode))
{
clienterror(fd,filename,"403","Forbidden","Tiny could't run the CGI program");
return;
}
serve_dynamic(fd,filename,cgiargs);
}
}
int main(int argc,char **argv)
{
int listenfd,connfd,port,clientlen;
struct sockaddr_in clientaddr;
if(argc!=2)
{
fprintf(stderr,"usage:%s <port>
",argv[0]);
exit(0);
}
port=atoi(argv[1]);
listenfd=open_listenfd(port);
while(1)
{
clientlen=sizeof(clientaddr);
connfd=accept(listenfd,(SA*)&clientaddr,&clientlen);
doit(connfd);
close(connfd);
}
}
我们能够直接使用浏览器測试上面的程序。比方当前server程序的文件夹以下有一个index.html，仅仅要我们在浏览器中输入：
localhost:<port>/index.html就能够请求到index.html
server端收到的浏览器请求行例如以下：
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