开源学习:tinyhttpd

tinyhttpd 算是轻量级的http服务器，原版是linux代码，支持cgi脚本，我改了windows版本，去掉cgi脚本支持。添加了支持二级制文件下载，这样可以在本地测试下载东西了。

// tinyhttpd.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "windows.h"
#include "winsock2.h"
#include "WS2tcpip.h"
#include <cstring>
#include <io.h>
#pragma comment(lib,"WS2_32.lib")

#define ISspace(x) ((x) == ' ')

#define SERVER_STRING "Server: jdbhttpd/0.1.0 "

DWORD WINAPI accept_request(void*);
void bad_request(int);
void cat(int, FILE *);
void cannot_execute(int);
void error_die(const char *);
int get_line(int, char *, int);
void headers(int, const char *);
void not_found(int);
void serve_file(int, const char *);
int startup(u_short *);
void unimplemented(int);
int strcasecmp(const char *pSrc,const char *pDst)
{
return stricmp(pSrc,pDst);
}

/**********************************************************************/
/* A request has caused a call to accept() on the server port to
* return. Process the request appropriately.
* Parameters: the socket connected to the client */
/**********************************************************************/
DWORD WINAPI accept_request(void *para)
{
int client = (int)para;
char buf[1024];
int numchars;
char method[255];
char url[255];
char path[512];
size_t i, j;

char *query_string = NULL;

numchars = get_line(client, buf, sizeof(buf));
i = 0; j = 0;
while (!ISspace(buf[j]) && (i < sizeof(method) - 1))
{
method[i] = buf[j];
i++; j++;
}
method[i] = '';

if (strcasecmp(method, "GET") && strcasecmp(method, "POST"))
{
unimplemented(client);
return 0;
}

i = 0;
while (ISspace(buf[j]) && (j < sizeof(buf)))
j++;
while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf)))
{
url[i] = buf[j];
i++; j++;
}
url[i] = '';

if (strcasecmp(method, "GET") == 0)
{
query_string = url;
while ((*query_string != '?') && (*query_string != ''))
query_string++;
if (*query_string == '?')
{

*query_string = '';
query_string++;
}
}

sprintf(path, "htdocs%s", url);
if (path[strlen(path) - 1] == '/')
strcat(path, "index.html");
if (0 != _access(path,0))
{
while ((numchars > 0) && strcmp(" ", buf)) /* read & discard headers */
numchars = get_line(client, buf, sizeof(buf));
not_found(client);
}
else
{
serve_file(client, path);
}

closesocket(client);
return 0;
}

/**********************************************************************/
/* Inform the client that a request it has made has a problem.
* Parameters: client socket */
/**********************************************************************/
void bad_request(int client)
{
char buf[1024];

sprintf(buf, "HTTP/1.0 400 BAD REQUEST ");
send(client, buf, sizeof(buf), 0);
sprintf(buf, "Content-type: text/html ");
send(client, buf, sizeof(buf), 0);
sprintf(buf, " ");
send(client, buf, sizeof(buf), 0);
sprintf(buf, "<P>Your browser sent a bad request, ");
send(client, buf, sizeof(buf), 0);
sprintf(buf, "such as a POST without a Content-Length. ");
send(client, buf, sizeof(buf), 0);
}

/**********************************************************************/
/* Put the entire contents of a file out on a socket. This function
* is named after the UNIX "cat" command, because it might have been
* easier just to do something like pipe, fork, and exec("cat").
* Parameters: the client socket descriptor
* FILE pointer for the file to cat */
#include "../../../Com/CFile.hpp"
/**********************************************************************/
void cat(int client, const char *resource)
{
Buf buf = MyReadFile(resource);
if (buf.p)
{
send(client, buf.p,buf.size , 0);
}
}

/**********************************************************************/
/* Inform the client that a CGI script could not be executed.
* Parameter: the client socket descriptor. */
/**********************************************************************/
void cannot_execute(int client)
{
char buf[1024];

sprintf(buf, "HTTP/1.0 500 Internal Server Error ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "Content-type: text/html ");
send(client, buf, strlen(buf), 0);
sprintf(buf, " ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<P>Error prohibited CGI execution. ");
send(client, buf, strlen(buf), 0);
}

/**********************************************************************/
/* Print out an error message with perror() (for system errors; based
* on value of errno, which indicates system call errors) and exit the
* program indicating an error. */
/**********************************************************************/
void error_die(const char *sc)
{
perror(sc);
exit(1);
}

/**********************************************************************/
/* Get a line from a socket, whether the line ends in a newline,
* carriage return, or a CRLF combination. Terminates the string read
* with a null character. If no newline indicator is found before the
* end of the buffer, the string is terminated with a null. If any of
* the above three line terminators is read, the last character of the
* string will be a linefeed and the string will be terminated with a
* null character.
* Parameters: the socket descriptor
* the buffer to save the data in
* the size of the buffer
* Returns: the number of bytes stored (excluding null) */
/**********************************************************************/
int get_line(int sock, char *buf, int size)
{
int i = 0;
char c = '';
int n;

while ((i < size - 1) && (c != ' '))
{
n = recv(sock, &c, 1, 0);
/* DEBUG printf("%02X ", c); */
if (n > 0)
{
if (c == ' ')
{
n = recv(sock, &c, 1, MSG_PEEK);
/* DEBUG printf("%02X ", c); */
if ((n > 0) && (c == ' '))
recv(sock, &c, 1, 0);
else
c = ' ';
}
buf[i] = c;
i++;
}
else
c = ' ';
}
buf[i] = '';

return(i);
}

/**********************************************************************/
/* Return the informational HTTP headers about a file. */
/* Parameters: the socket to print the headers on
* the name of the file */
/**********************************************************************/
void headers(int client, const char *filename)
{
char buf[1024];
(void)filename; /* could use filename to determine file type */

strcpy(buf, "HTTP/1.0 200 OK ");
send(client, buf, strlen(buf), 0);
strcpy(buf, SERVER_STRING);
send(client, buf, strlen(buf), 0);
sprintf(buf, "Content-Type: application/octet-stream ");
send(client, buf, strlen(buf), 0);
strcpy(buf, " ");
send(client, buf, strlen(buf), 0);
}

/**********************************************************************/
/* Give a client a 404 not found status message. */
/**********************************************************************/
void not_found(int client)
{
char buf[1024];

sprintf(buf, "HTTP/1.0 404 NOT FOUND ");
send(client, buf, strlen(buf), 0);
sprintf(buf, SERVER_STRING);
send(client, buf, strlen(buf), 0);
sprintf(buf, "Content-Type: text/html ");
send(client, buf, strlen(buf), 0);
sprintf(buf, " ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<HTML><TITLE>Not Found</TITLE> ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<BODY><P>The server could not fulfill ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "your request because the resource specified ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "is unavailable or nonexistent. ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "</BODY></HTML> ");
send(client, buf, strlen(buf), 0);
}

/**********************************************************************/
/* Send a regular file to the client. Use headers, and report
* errors to client if they occur.
* Parameters: a pointer to a file structure produced from the socket
* file descriptor
* the name of the file to serve */
/**********************************************************************/
void serve_file(int client, const char *filename)
{
FILE *resource = NULL;
int numchars = 1;
char buf[1024];

buf[0] = 'A'; buf[1] = '';
while ((numchars > 0) && strcmp(" ", buf)) /* read & discard headers */
numchars = get_line(client, buf, sizeof(buf));

resource = fopen(filename, "rb");
if (resource == NULL)
not_found(client);
else
{
headers(client, filename);
cat(client, filename);
}
fclose(resource);
}

/**********************************************************************/
/* This function starts the process of listening for web connections
* on a specified port. If the port is 0, then dynamically allocate a
* port and modify the original port variable to reflect the actual
* port.
* Parameters: pointer to variable containing the port to connect on
* Returns: the socket */
/**********************************************************************/
int startup(u_short *port)
{
int httpd = 0;
struct sockaddr_in name;

httpd = socket(PF_INET, SOCK_STREAM, 0);
if (httpd == -1)
error_die("socket");
memset(&name, 0, sizeof(name));
name.sin_family = AF_INET;
name.sin_port = htons(*port);
name.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0)
error_die("bind");
if (*port == 0) /* if dynamically allocating a port */
{
int namelen = sizeof(name);
if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1)
error_die("getsockname");
*port = ntohs(name.sin_port);
}
if (listen(httpd, 5) < 0)
error_die("listen");
return(httpd);
}

/**********************************************************************/
/* Inform the client that the requested web method has not been
* implemented.
* Parameter: the client socket */
/**********************************************************************/
void unimplemented(int client)
{
char buf[1024];

sprintf(buf, "HTTP/1.0 501 Method Not Implemented ");
send(client, buf, strlen(buf), 0);
sprintf(buf, SERVER_STRING);
send(client, buf, strlen(buf), 0);
sprintf(buf, "Content-Type: text/html ");
send(client, buf, strlen(buf), 0);
sprintf(buf, " ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "</TITLE></HEAD> ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<BODY><P>HTTP request method not supported. ");
send(client, buf, strlen(buf), 0);
sprintf(buf, "</BODY></HTML> ");
send(client, buf, strlen(buf), 0);
}

/**********************************************************************/
static void InitWinSock()
{
WSAData wsaData;
WSAStartup(MAKEWORD(2, 1), &wsaData) ;

}
int main(void)
{
InitWinSock();
int server_sock = -1;
u_short port = 80;
int client_sock = -1;
struct sockaddr_in client_name;
int client_name_len = sizeof(client_name);

server_sock = startup(&port);
printf("httpd running on port %d ", port);

while (1)
{
client_sock = accept(server_sock,
(struct sockaddr *)&client_name,
&client_name_len);
if (client_sock == -1)
error_die("accept");
CreateThread(0,0,accept_request,(void*)client_sock,0,0);

}

closesocket(server_sock);

return(0);
}