/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bin.h>#include <httpd.h> inthredirected(HConnect *c, char *how, char *uri){	Hio *hout;	char *s, *ss, *scheme, *host;	char sayport[NETPATHLEN];	int n; 	scheme = c->scheme? c->scheme: "http";	host = c->head.host;	if(strchr(uri, ':') != nil)		host = "";	else if(uri[0] != '/'){		s = strrchr(c->req.uri, '/');		if(s != nil)			*s = '\0';		ss = halloc(c, strlen(c->req.uri) + strlen(uri) + 2 + UTFmax);		sprint(ss, "%s/%s", c->req.uri, uri);		uri = ss;		if(s != nil)			*s = '/';	} 	if((strcmp(scheme, "http") == 0 && atoi(c->port) == 80) ||	   (strcmp(scheme, "https") == 0 && atoi(c->port) == 443) ||	    strchr(host, ':') != nil)		sayport[0] = '\0';	else		snprint(sayport, sizeof sayport, ":%s", c->port); 	n = snprint(c->xferbuf, HBufSize, 			"<head><title>Redirection</title></head>\r\n"			"<body><h1>Redirection</h1>\r\n"			"Your selection can be found <a href=\"%U\"> here</a>.<p></body>\r\n", uri); 	hout = &c->hout;	hprint(hout, "%s %s\r\n", hversion, how);	hprint(hout, "Date: %D\r\n", time(nil));	hprint(hout, "Server: Plan9\r\n");	hprint(hout, "Content-type: text/html\r\n");	hprint(hout, "Content-Length: %d\r\n", n);	if(host == nil || host[0] == 0)		hprint(hout, "Location: %U\r\n", uri);	else		hprint(hout, "Location: %s://%U%s%U\r\n",			scheme, host, sayport, uri);	if(c->head.closeit)		hprint(hout, "Connection: close\r\n");	else if(!http11(c))		hprint(hout, "Connection: Keep-Alive\r\n");	hprint(hout, "\r\n"); 	if(strcmp(c->req.meth, "HEAD") != 0)		hwrite(hout, c->xferbuf, n); 	if(c->replog)		if(host == nil || host[0] == 0)			c->replog(c, "Reply: %s\nRedirect: %U\n", how, uri);		else			c->replog(c, "Reply: %s\nRedirect: %s://%U%s%U\n",				how, scheme, host, sayport, uri);	return hflush(hout);} inthmoved(HConnect *c, char *uri){	return hredirected(c, "301 Moved Permanently", uri);}