post.c

用Dynamic C写的http程序

/*******************************************************************************
        post.c
        Z-World, 2000

        This program accepts and parses POST style form submission, to
        get information from the user.
*******************************************************************************/
#class auto


/***********************************
 * Configuration                   *
 * -------------                   *
 * All fields in this section must *
 * be altered to match your local  *
 * network settings.               *
 ***********************************/

/*
 * Pick the predefined TCP/IP configuration for this sample.  See
 * LIB\TCPIP\TCP_CONFIG.LIB for instructions on how to set the
 * configuration.
 */
#define TCPCONFIG 1


/*
 * Web server configuration
 */

/*
 * Only one server is needed for a reserved port
 */
#define HTTP_MAXSERVERS 1
#define MAX_TCP_SOCKET_BUFFERS 1

/*
 * Our web server as seen from the clients.
 * This should be the address that the clients (netscape/IE)
 * use to access your server. Usually, this is your IP address.
 * If you are behind a firewall, though, it might be a port on
 * the proxy, that will be forwarded to the Rabbit board. The
 * commented out line is an example of such a situation.
 */
#define REDIRECTHOST		_PRIMARY_STATIC_IP
//#define REDIRECTHOST	"proxy.domain.com:1212"


/********************************
 * End of configuration section *
 ********************************/

/*
 *  REDIRECTTO is used by each ledxtoggle cgi's to tell the
 *  browser which page to hit next.  The default REDIRECTTO
 *  assumes that you are serving a page that does not have
 *  any address translation applied to it.
 *
 */

#define REDIRECTTO 		"http://" REDIRECTHOST ""

#memmap xmem
#use "dcrtcp.lib"
#use "http.lib"

#ximport "samples/tcpip/http/pages/form.html"      index_html

/* the default for / must be first */
SSPEC_MIMETABLE_START
	SSPEC_MIME_FUNC(".shtml", "text/html", shtml_handler),
	SSPEC_MIME(".html", "text/html"),
	SSPEC_MIME(".gif", "image/gif"),
	SSPEC_MIME(".cgi", "")
SSPEC_MIMETABLE_END

#define MAX_FORMSIZE	64
typedef struct {
	char *name;
	char value[MAX_FORMSIZE];
} FORMType;
FORMType FORMSpec[2];

/*
 * parse the url-encoded POST data into the FORMSpec struct
 * (ie: parse 'foo=bar&baz=qux' into the struct
 */
int parse_post(HttpState* state)
{
	auto int retval;
	auto int i;

	// state->s is the socket structure, and state->p is pointer
	// into the HTTP state buffer (initially pointing to the beginning
	// of the buffer).  Note that state->p was set up in the submit
	// CGI function.  Also note that we read up to the content_length,
	// or HTTP_MAXBUFFER, whichever is smaller.  Larger POSTs will be
	// truncated.
	retval = sock_aread(&state->s, state->p,
	                    (state->content_length < HTTP_MAXBUFFER-1)?
	                     (int)state->content_length:HTTP_MAXBUFFER-1);
	if (retval < 0) {
		// Error--just bail out
		return 1;
	}

	// Using the subsubstate to keep track of how much data we have received
	state->subsubstate += retval;

	if (state->subsubstate >= state->content_length) {
		// NULL-terminate the content buffer
		state->buffer[(int)state->content_length] = '\0';

		// Scan the received POST information into the FORMSpec structure
		for(i=0; i<(sizeof(FORMSpec)/sizeof(FORMType)); i++) {
			http_scanpost(FORMSpec[i].name, state->buffer, FORMSpec[i].value,
			              MAX_FORMSIZE);
		}

		// Finished processing--returning 1 indicates that we are done
		return 1;
	}
	// Processing not finished--return 0 so that we can be called again
	return 0;
}

/*
 * Sample submit.cgi function
 */
int submit(HttpState* state)
{
	auto int i;

	if(state->length) {
		/* buffer to write out */
		if(state->offset < state->length) {
			state->offset += sock_fastwrite(&state->s,
					state->buffer + (int)state->offset,
					(int)state->length - (int)state->offset);
		} else {
			state->offset = 0;
			state->length = 0;
		}
	} else {
		switch(state->substate) {
		case 0:
			strcpy(state->buffer, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n");
			state->length = strlen(state->buffer);
			state->offset = 0;
			state->substate++;
			break;

		case 1:
			strcpy(state->buffer, "<html><head><title>Results</title></head><body>\r\n");
			state->length = strlen(state->buffer);
			state->substate++;
			break;

		case 2:
			/* init the FORMSpec data */
			FORMSpec[0].value[0] = '\0';
			FORMSpec[1].value[0] = '\0';

			state->p = state->buffer;
			state->substate++;
			break;

		case 3:
			/* parse the POST information */
			if(parse_post(state)) {
				sprintf(state->buffer, "<p>Username: %s<p>\r\n<p>Email: %s<p>\r\n",
					FORMSpec[0].value, FORMSpec[1].value);
				state->length = strlen(state->buffer);
				state->substate++;
			} else {
			}
			break;

		case 4:
			strcpy(state->buffer, "<p>Go <a href=\"/\">home</a></body></html>\r\n");
			state->length = strlen(state->buffer);
			state->substate++;
			break;

		default:
			state->substate = 0;
			return 1;
		}
	}

	return 0;
}

SSPEC_RESOURCETABLE_START
	SSPEC_RESOURCE_XMEMFILE("/index.html", index_html),
	SSPEC_RESOURCE_FUNCTION("/submit.cgi", submit)
SSPEC_RESOURCETABLE_END

void main()
{
	/* init FORM searchable names - must init ALL FORMSpec structs! */
	FORMSpec[0].name = "user_name";
	FORMSpec[1].name = "user_email";

	sock_init();
	http_init();
	tcp_reserveport(80);

	while (1) {
		http_handler();
	}
}