Import sources from 2011-03-30 iso image

1 files changed, 1266 insertions, 0 deletions

diff --git a/sys/src/cmd/webcookies.c b/sys/src/cmd/webcookies.c
new file mode 100755
index 000000000..1ae358cff
--- /dev/null
+++ b/sys/src/cmd/webcookies.c
@@ -0,0 +1,1266 @@
+/*
+ * Cookie file system.  Allows hget and multiple webfs's to collaborate.
+ * Conventionally mounted on /mnt/webcookies.
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ndb.h>
+#include <fcall.h>
+#include <thread.h>
+#include <9p.h>
+#include <ctype.h>
+
+int debug = 0;
+
+typedef struct Cookie Cookie;
+typedef struct Jar Jar;
+
+struct Cookie
+{
+	/* external info */
+	char*	name;
+	char*	value;
+	char*	dom;		/* starts with . */
+	char*	path;
+	char*	version;
+	char*	comment;	/* optional, may be nil */
+
+	uint	expire;		/* time of expiration: ~0 means when webcookies dies */
+	int	secure;
+	int	explicitdom;	/* dom was explicitly set */
+	int	explicitpath;	/* path was explicitly set */
+	int	netscapestyle;
+
+	/* internal info */
+	int	deleted;
+	int	mark;
+	int	ondisk;
+};
+
+struct Jar
+{
+	Cookie	*c;
+	int	nc;
+	int	mc;
+
+	Qid	qid;
+	int	dirty;
+	char	*file;
+	char	*lockfile;
+};
+
+struct {
+	char	*s;
+	int	offset;
+	int	ishttp;
+} stab[] = {
+	"domain",		offsetof(Cookie, dom),		1,
+	"path",			offsetof(Cookie, path),		1,
+	"name",			offsetof(Cookie, name),		0,
+	"value",		offsetof(Cookie, value),	0,
+	"comment",		offsetof(Cookie, comment),	1,
+	"version",		offsetof(Cookie, version),	1,
+};
+
+struct {
+	char *s;
+	int	offset;
+} itab[] = {
+	"expire",		offsetof(Cookie, expire),
+	"secure",		offsetof(Cookie, secure),
+	"explicitdomain",	offsetof(Cookie, explicitdom),
+	"explicitpath",		offsetof(Cookie, explicitpath),
+	"netscapestyle",	offsetof(Cookie, netscapestyle),
+};
+
+#pragma varargck type "J"	Jar*
+#pragma varargck type "K"	Cookie*
+
+/* HTTP format */
+int
+jarfmt(Fmt *fmt)
+{
+	int i;
+	Jar *jar;
+
+	jar = va_arg(fmt->args, Jar*);
+	if(jar == nil || jar->nc == 0)
+		return fmtstrcpy(fmt, "");
+
+	fmtprint(fmt, "Cookie: ");
+	if(jar->c[0].version)
+		fmtprint(fmt, "$Version=%s; ", jar->c[0].version);
+	for(i=0; i<jar->nc; i++)
+		fmtprint(fmt, "%s%s=%s", i ? "; ":"", jar->c[i].name, jar->c[i].value);
+	fmtprint(fmt, "\r\n");
+	return 0;
+}
+
+/* individual cookie */
+int
+cookiefmt(Fmt *fmt)
+{
+	int j, k, first;
+	char *t;
+	Cookie *c;
+
+	c = va_arg(fmt->args, Cookie*);
+
+	first = 1;
+	for(j=0; j<nelem(stab); j++){
+		t = *(char**)((char*)c+stab[j].offset);
+		if(t == nil)
+			continue;
+		if(first)
+			first = 0;
+		else
+			fmtprint(fmt, " ");
+		fmtprint(fmt, "%s=%q", stab[j].s, t);
+	}
+	for(j=0; j<nelem(itab); j++){
+		k = *(int*)((char*)c+itab[j].offset);
+		if(k == 0)
+			continue;
+		if(first)
+			first = 0;
+		else
+			fmtprint(fmt, " ");
+		fmtprint(fmt, "%s=%ud", itab[j].s, k);
+	}
+	return 0;
+}
+
+/*
+ * sort cookies:
+ *	- alpha by name
+ *	- alpha by domain
+ *	- longer paths first, then alpha by path (RFC2109 4.3.4)
+ */
+int
+cookiecmp(Cookie *a, Cookie *b)
+{
+	int i;
+
+	if((i = strcmp(a->name, b->name)) != 0)
+		return i;
+	if((i = cistrcmp(a->dom, b->dom)) != 0)
+		return i;
+	if((i = strlen(b->path) - strlen(a->path)) != 0)
+		return i;
+	if((i = strcmp(a->path, b->path)) != 0)
+		return i;
+	return 0;
+}
+
+int
+exactcookiecmp(Cookie *a, Cookie *b)
+{
+	int i;
+
+	if((i = cookiecmp(a, b)) != 0)
+		return i;
+	if((i = strcmp(a->value, b->value)) != 0)
+		return i;
+	if(a->version || b->version){
+		if(!a->version)
+			return -1;
+		if(!b->version)
+			return 1;
+		if((i = strcmp(a->version, b->version)) != 0)
+			return i;
+	}
+	if(a->comment || b->comment){
+		if(!a->comment)
+			return -1;
+		if(!b->comment)
+			return 1;
+		if((i = strcmp(a->comment, b->comment)) != 0)
+			return i;
+	}
+	if((i = b->expire - a->expire) != 0)
+		return i;
+	if((i = b->secure - a->secure) != 0)
+		return i;
+	if((i = b->explicitdom - a->explicitdom) != 0)
+		return i;
+	if((i = b->explicitpath - a->explicitpath) != 0)
+		return i;
+	if((i = b->netscapestyle - a->netscapestyle) != 0)
+		return i;
+
+	return 0;
+}
+
+void
+freecookie(Cookie *c)
+{
+	int i;
+
+	for(i=0; i<nelem(stab); i++)
+		free(*(char**)((char*)c+stab[i].offset));
+}
+
+void
+copycookie(Cookie *c)
+{
+	int i;
+	char **ps;
+
+	for(i=0; i<nelem(stab); i++){
+		ps = (char**)((char*)c+stab[i].offset);
+		if(*ps)
+			*ps = estrdup9p(*ps);
+	}
+}
+
+void
+delcookie(Jar *j, Cookie *c)
+{
+	int i;
+
+	j->dirty = 1;
+	i = c - j->c;
+	if(i < 0 || i >= j->nc)
+		abort();
+	c->deleted = 1;
+}
+
+void
+addcookie(Jar *j, Cookie *c)
+{
+	int i;
+
+	if(!c->name || !c->value || !c->path || !c->dom){
+		fprint(2, "not adding incomplete cookie\n");
+		return;
+	}
+
+	if(debug)
+		fprint(2, "add %K\n", c);
+
+	for(i=0; i<j->nc; i++)
+		if(cookiecmp(&j->c[i], c) == 0){
+			if(debug)
+				fprint(2, "cookie %K matches %K\n", &j->c[i], c);
+			if(exactcookiecmp(&j->c[i], c) == 0){
+				if(debug)
+					fprint(2, "\texactly\n");
+				j->c[i].mark = 0;
+				return;
+			}
+			delcookie(j, &j->c[i]);
+		}
+
+	j->dirty = 1;
+	if(j->nc == j->mc){
+		j->mc += 16;
+		j->c = erealloc9p(j->c, j->mc*sizeof(Cookie));
+	}
+	j->c[j->nc] = *c;
+	copycookie(&j->c[j->nc]);
+	j->nc++;
+}
+
+void
+purgejar(Jar *j)
+{
+	int i;
+
+	for(i=j->nc-1; i>=0; i--){
+		if(!j->c[i].deleted)
+			continue;
+		freecookie(&j->c[i]);
+		--j->nc;
+		j->c[i] = j->c[j->nc];
+	}
+}
+
+void
+addtojar(Jar *jar, char *line, int ondisk)
+{
+	Cookie c;
+	int i, j, nf, *pint;
+	char *f[20], *attr, *val, **pstr;
+	
+	memset(&c, 0, sizeof c);
+	c.expire = ~0;
+	c.ondisk = ondisk;
+	nf = tokenize(line, f, nelem(f));
+	for(i=0; i<nf; i++){
+		attr = f[i];
+		if((val = strchr(attr, '=')) != nil)
+			*val++ = '\0';
+		else
+			val = "";
+		/* string attributes */
+		for(j=0; j<nelem(stab); j++){
+			if(strcmp(stab[j].s, attr) == 0){
+				pstr = (char**)((char*)&c+stab[j].offset);
+				*pstr = val;
+			}
+		}
+		/* integer attributes */
+		for(j=0; j<nelem(itab); j++){
+			if(strcmp(itab[j].s, attr) == 0){
+				pint = (int*)((char*)&c+itab[j].offset);
+				if(val[0]=='\0')
+					*pint = 1;
+				else
+					*pint = strtoul(val, 0, 0);
+			}
+		}
+	}
+	if(c.name==nil || c.value==nil || c.dom==nil || c.path==nil){
+		if(debug)
+			fprint(2, "ignoring fractional cookie %K\n", &c);
+		return;
+	}
+	addcookie(jar, &c);
+}
+
+Jar*
+newjar(void)
+{
+	Jar *jar;
+
+	jar = emalloc9p(sizeof(Jar));
+	return jar;
+}
+
+int
+expirejar(Jar *jar, int exiting)
+{
+	int i, n;
+	uint now;
+
+	now = time(0);
+	n = 0;
+	for(i=0; i<jar->nc; i++){
+		if(jar->c[i].expire < now || (exiting && jar->c[i].expire==~0)){
+			delcookie(jar, &jar->c[i]);
+			n++;
+		}
+	}
+	return n;
+}
+
+int
+syncjar(Jar *jar)
+{
+	int i, fd;
+	char *line;
+	Dir *d;
+	Biobuf *b;
+	Qid q;
+
+	if(jar->file==nil)
+		return 0;
+
+	memset(&q, 0, sizeof q);
+	if((d = dirstat(jar->file)) != nil){
+		q = d->qid;
+		if(d->qid.path != jar->qid.path || d->qid.vers != jar->qid.vers)
+			jar->dirty = 1;
+		free(d);
+	}
+
+	if(jar->dirty == 0)
+		return 0;
+
+	fd = -1;
+	for(i=0; i<50; i++){
+		if((fd = create(jar->lockfile, OWRITE, DMEXCL|0666)) < 0){
+			sleep(100);
+			continue;
+		}
+		break;
+	}
+	if(fd < 0){
+		if(debug)
+			fprint(2, "open %s: %r", jar->lockfile);
+		werrstr("cannot acquire jar lock: %r");
+		return -1;
+	}
+
+	for(i=0; i<jar->nc; i++)	/* mark is cleared by addcookie */
+		jar->c[i].mark = jar->c[i].ondisk;
+
+	if((b = Bopen(jar->file, OREAD)) == nil){
+		if(debug)
+			fprint(2, "Bopen %s: %r", jar->file);
+		werrstr("cannot read cookie file %s: %r", jar->file);
+		close(fd);
+		return -1;
+	}
+	for(; (line = Brdstr(b, '\n', 1)) != nil; free(line)){
+		if(*line == '#')
+			continue;
+		addtojar(jar, line, 1);
+	}
+	Bterm(b);
+
+	for(i=0; i<jar->nc; i++)
+		if(jar->c[i].mark)
+			delcookie(jar, &jar->c[i]);
+
+	purgejar(jar);
+
+	b = Bopen(jar->file, OWRITE);
+	if(b == nil){
+		if(debug)
+			fprint(2, "Bopen write %s: %r", jar->file);
+		close(fd);
+		return -1;
+	}
+	Bprint(b, "# webcookies cookie jar\n");
+	Bprint(b, "# comments and non-standard fields will be lost\n");
+	for(i=0; i<jar->nc; i++){
+		if(jar->c[i].expire == ~0)
+			continue;
+		Bprint(b, "%K\n", &jar->c[i]);
+		jar->c[i].ondisk = 1;
+	}
+	Bterm(b);
+
+	jar->dirty = 0;
+	close(fd);
+	if((d = dirstat(jar->file)) != nil){
+		jar->qid = d->qid;
+		free(d);
+	}
+	return 0;
+}
+
+Jar*
+readjar(char *file)
+{
+	char *lock, *p;
+	Jar *jar;
+
+	jar = newjar();
+	lock = emalloc9p(strlen(file)+10);
+	strcpy(lock, file);
+	if((p = strrchr(lock, '/')) != nil)
+		p++;
+	else
+		p = lock;
+	memmove(p+2, p, strlen(p)+1);
+	p[0] = 'L';
+	p[1] = '.';
+	jar->lockfile = lock;
+	jar->file = file;
+	jar->dirty = 1;
+
+	if(syncjar(jar) < 0){
+		free(jar->file);
+		free(jar->lockfile);
+		free(jar);
+		return nil;
+	}
+	return jar;
+}
+
+void
+closejar(Jar *jar)
+{
+	int i;
+
+	expirejar(jar, 0);
+	if(syncjar(jar) < 0)
+		fprint(2, "warning: cannot rewrite cookie jar: %r\n");
+
+	for(i=0; i<jar->nc; i++)
+		freecookie(&jar->c[i]);
+
+	free(jar->file);
+	free(jar);	
+}
+
+/*
+ * Domain name matching is per RFC2109, section 2:
+ *
+ * Hosts names can be specified either as an IP address or a FQHN
+ * string.  Sometimes we compare one host name with another.  Host A's
+ * name domain-matches host B's if
+ *
+ * * both host names are IP addresses and their host name strings match
+ *   exactly; or
+ *
+ * * both host names are FQDN strings and their host name strings match
+ *   exactly; or
+ *
+ * * A is a FQDN string and has the form NB, where N is a non-empty name
+ *   string, B has the form .B', and B' is a FQDN string.  (So, x.y.com
+ *   domain-matches .y.com but not y.com.)
+ *
+ * Note that domain-match is not a commutative operation: a.b.c.com
+ * domain-matches .c.com, but not the reverse.
+ *
+ * (This does not verify that IP addresses and FQDN's are well-formed.)
+ */
+int
+isdomainmatch(char *name, char *pattern)
+{
+	int lname, lpattern;
+
+	if(cistrcmp(name, pattern)==0)
+		return 1;
+
+	if(strcmp(ipattr(name), "dom")==0 && pattern[0]=='.'){
+		lname = strlen(name);
+		lpattern = strlen(pattern);
+		if(lname >= lpattern && cistrcmp(name+lname-lpattern, pattern)==0)
+			return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * RFC2109 4.3.4:
+ *	- domain must match
+ *	- path in cookie must be a prefix of request path
+ *	- cookie must not have expired
+ */
+int
+iscookiematch(Cookie *c, char *dom, char *path, uint now)
+{
+	return isdomainmatch(dom, c->dom)
+		&& strncmp(c->path, path, strlen(c->path))==0
+		&& c->expire >= now;
+}
+
+/* 
+ * Produce a subjar of matching cookies.
+ * Secure cookies are only included if secure is set.
+ */
+Jar*
+cookiesearch(Jar *jar, char *dom, char *path, int issecure)
+{
+	int i;
+	Jar *j;
+	uint now;
+
+	now = time(0);
+	j = newjar();
+	for(i=0; i<jar->nc; i++)
+		if((issecure || !jar->c[i].secure) && iscookiematch(&jar->c[i], dom, path, now))
+			addcookie(j, &jar->c[i]);
+	if(j->nc == 0){
+		closejar(j);
+		werrstr("no cookies found");
+		return nil;
+	}
+	qsort(j->c, j->nc, sizeof(j->c[0]), (int(*)(const void*, const void*))cookiecmp);
+	return j;
+}
+
+/*
+ * RFC2109 4.3.2 security checks
+ */
+char*
+isbadcookie(Cookie *c, char *dom, char *path)
+{
+	if(strncmp(c->path, path, strlen(c->path)) != 0)
+		return "cookie path is not a prefix of the request path";
+
+	if(c->explicitdom && c->dom[0] != '.')
+		return "cookie domain doesn't start with dot";
+
+	if(memchr(c->dom+1, '.', strlen(c->dom)-1-1) == nil)
+		return "cookie domain doesn't have embedded dots";
+
+	if(!isdomainmatch(dom, c->dom))
+		return "request host does not match cookie domain";
+
+	if(strcmp(ipattr(dom), "dom")==0
+	&& memchr(dom, '.', strlen(dom)-strlen(c->dom)) != nil)
+		return "request host contains dots before cookie domain";
+
+	return 0;
+}
+
+/*
+ * Sunday, 25-Jan-2002 12:24:36 GMT
+ * Sunday, 25 Jan 2002 12:24:36 GMT
+ * Sun, 25 Jan 02 12:24:36 GMT
+ */
+int
+isleap(int year)
+{
+	return year%4==0 && (year%100!=0 || year%400==0);
+}
+
+uint
+strtotime(char *s)
+{
+	char *os;
+	int i;
+	Tm tm;
+
+	static int mday[2][12] = {
+		31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
+		31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
+	};
+	static char *wday[] = {
+		"Sunday", "Monday", "Tuesday", "Wednesday",
+		"Thursday", "Friday", "Saturday",
+	};
+	static char *mon[] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+	};
+
+	os = s;
+	/* Sunday, */
+	for(i=0; i<nelem(wday); i++){
+		if(cistrncmp(s, wday[i], strlen(wday[i])) == 0){
+			s += strlen(wday[i]);
+			break;
+		}
+		if(cistrncmp(s, wday[i], 3) == 0){
+			s += 3;
+			break;
+		}
+	}
+	if(i==nelem(wday)){
+		if(debug)
+			fprint(2, "bad wday (%s)\n", os);
+		return -1;
+	}
+	if(*s++ != ',' || *s++ != ' '){
+		if(debug)
+			fprint(2, "bad wday separator (%s)\n", os);
+		return -1;
+	}
+
+	/* 25- */
+	if(!isdigit(s[0]) || !isdigit(s[1]) || (s[2]!='-' && s[2]!=' ')){
+		if(debug)
+			fprint(2, "bad day of month (%s)\n", os);
+		return -1;
+	}
+	tm.mday = strtol(s, 0, 10);
+	s += 3;
+
+	/* Jan- */
+	for(i=0; i<nelem(mon); i++)
+		if(cistrncmp(s, mon[i], 3) == 0){
+			tm.mon = i;
+			s += 3;
+			break;
+		}
+	if(i==nelem(mon)){
+		if(debug)
+			fprint(2, "bad month (%s)\n", os);
+		return -1;
+	}
+	if(s[0] != '-' && s[0] != ' '){
+		if(debug)
+			fprint(2, "bad month separator (%s)\n", os);
+		return -1;
+	}
+	s++;
+
+	/* 2002 */
+	if(!isdigit(s[0]) || !isdigit(s[1])){
+		if(debug)
+			fprint(2, "bad year (%s)\n", os);
+		return -1;
+	}
+	tm.year = strtol(s, 0, 10);
+	s += 2;
+	if(isdigit(s[0]) && isdigit(s[1]))
+		s += 2;
+	else{
+		if(tm.year <= 68)
+			tm.year += 2000;
+		else
+			tm.year += 1900;
+	}
+	if(tm.mday==0 || tm.mday > mday[isleap(tm.year)][tm.mon]){
+		if(debug)
+			fprint(2, "invalid day of month (%s)\n", os);
+		return -1;
+	}
+	tm.year -= 1900;
+	if(*s++ != ' '){
+		if(debug)
+			fprint(2, "bad year separator (%s)\n", os);
+		return -1;
+	}
+
+	if(!isdigit(s[0]) || !isdigit(s[1]) || s[2]!=':'
+	|| !isdigit(s[3]) || !isdigit(s[4]) || s[5]!=':'
+	|| !isdigit(s[6]) || !isdigit(s[7]) || s[8]!=' '){
+		if(debug)
+			fprint(2, "bad time (%s)\n", os);
+		return -1;
+	}
+
+	tm.hour = atoi(s);
+	tm.min = atoi(s+3);
+	tm.sec = atoi(s+6);
+	if(tm.hour >= 24 || tm.min >= 60 || tm.sec >= 60){
+		if(debug)
+			fprint(2, "invalid time (%s)\n", os);
+		return -1;
+	}
+	s += 9;
+
+	if(cistrcmp(s, "GMT") != 0){
+		if(debug)
+			fprint(2, "time zone not GMT (%s)\n", os);
+		return -1;
+	}
+	strcpy(tm.zone, "GMT");
+	tm.yday = 0;
+	return tm2sec(&tm);
+}
+
+/*
+ * skip linear whitespace.  we're a bit more lenient than RFC2616 2.2.
+ */
+char*
+skipspace(char *s)
+{
+	while(*s=='\r' || *s=='\n' || *s==' ' || *s=='\t')
+		s++;
+	return s;
+}
+
+/*
+ * Try to identify old netscape headers.
+ * The old headers:
+ *	- didn't allow spaces around the '='
+ *	- used an 'Expires' attribute
+ *	- had no 'Version' attribute
+ *	- had no quotes
+ *	- allowed whitespace in values
+ *	- apparently separated attr/value pairs with ';' exclusively
+ */
+int
+isnetscape(char *hdr)
+{
+	char *s;
+
+	for(s=hdr; (s=strchr(s, '=')) != nil; s++){
+		if(isspace(s[1]) || (s > hdr && isspace(s[-1])))
+			return 0;
+		if(s[1]=='"')
+			return 0;
+	}
+	if(cistrstr(hdr, "version="))
+		return 0;
+	return 1;
+}
+
+/*
+ * Parse HTTP response headers, adding cookies to jar.
+ * Overwrites the headers.  May overwrite path.
+ */
+char* parsecookie(Cookie*, char*, char**, int, char*, char*);
+int
+parsehttp(Jar *jar, char *hdr, char *dom, char *path)
+{
+	static char setcookie[] = "Set-Cookie:";
+	char *e, *p, *nextp;
+	Cookie c;
+	int isns, n;
+
+	isns = isnetscape(hdr);
+	n = 0;
+	for(p=hdr; p; p=nextp){
+		p = skipspace(p);
+		if(*p == '\0')
+			break;
+		nextp = strchr(p, '\n');
+		if(nextp != nil)
+			*nextp++ = '\0';
+		if(debug)
+			fprint(2, "?%s\n", p);
+		if(cistrncmp(p, setcookie, strlen(setcookie)) != 0)
+			continue;
+		if(debug)
+			fprint(2, "%s\n", p);
+		p = skipspace(p+strlen(setcookie));
+		for(; *p; p=skipspace(p)){
+			if((e = parsecookie(&c, p, &p, isns, dom, path)) != nil){
+				if(debug)
+					fprint(2, "parse cookie: %s\n", e);
+				break;
+			}
+			if((e = isbadcookie(&c, dom, path)) != nil){
+				if(debug)
+					fprint(2, "reject cookie; %s\n", e);
+				continue;
+			}
+			addcookie(jar, &c);
+			n++;
+		}
+	}
+	return n;
+}
+
+static char*
+skipquoted(char *s)
+{
+	/*
+	 * Sec 2.2 of RFC2616 defines a "quoted-string" as:
+	 *
+	 *  quoted-string  = ( <"> *(qdtext | quoted-pair ) <"> )
+	 *  qdtext         = <any TEXT except <">>
+	 *  quoted-pair    = "\" CHAR
+	 *
+	 * TEXT is any octet except CTLs, but including LWS;
+	 * LWS is [CR LF] 1*(SP | HT);
+	 * CHARs are ASCII octets 0-127;  (NOTE: we reject 0's)
+	 * CTLs are octets 0-31 and 127;
+	 */
+	if(*s != '"')
+		return s;
+
+	for(s++; 32 <= *s && *s < 127 && *s != '"'; s++)
+		if(*s == '\\' && *(s+1) != '\0')
+			s++;
+	return s;
+}
+
+static char*
+skiptoken(char *s)
+{
+	/*
+	 * Sec 2.2 of RFC2616 defines a "token" as
+ 	 *  1*<any CHAR except CTLs or separators>;
+	 * CHARs are ASCII octets 0-127;
+	 * CTLs are octets 0-31 and 127;
+	 * separators are "()<>@,;:\/[]?={}", double-quote, SP (32), and HT (9)
+	 */
+	while(32 <= *s && *s < 127 && strchr("()<>@,;:[]?={}\" \t\\", *s)==nil)
+		s++;
+
+	return s;
+}
+
+static char*
+skipvalue(char *s, int isns)
+{
+	char *t;
+
+	/*
+	 * An RFC2109 value is an HTTP token or an HTTP quoted string.
+	 * Netscape servers ignore the spec and rely on semicolons, apparently.
+	 */
+	if(isns){
+		if((t = strchr(s, ';')) == nil)
+			t = s+strlen(s);
+		return t;
+	}
+	if(*s == '"')
+		return skipquoted(s);
+	return skiptoken(s);
+}
+
+/*
+ * RMID=80b186bb64c03c65fab767f8; expires=Monday, 10-Feb-2003 04:44:39 GMT; 
+ *	path=/; domain=.nytimes.com
+ */
+char*
+parsecookie(Cookie *c, char *p, char **e, int isns, char *dom, char *path)
+{
+	int i, done;
+	char *t, *u, *attr, *val;
+
+	memset(c, 0, sizeof *c);
+	c->expire = ~0;
+
+	/* NAME=VALUE */
+	t = skiptoken(p);
+	c->name = p;
+	p = skipspace(t);
+	if(*p != '='){
+	Badname:
+		return "malformed cookie: no NAME=VALUE";
+	}
+	*t = '\0';
+	p = skipspace(p+1);
+	t = skipvalue(p, isns);
+	if(*t)
+		*t++ = '\0';
+	c->value = p;
+	p = skipspace(t);
+	if(c->name[0]=='\0' || c->value[0]=='\0')
+		goto Badname;
+
+	done = 0;
+	for(; *p && !done; p=skipspace(p)){
+		attr = p;
+		t = skiptoken(p);
+		u = skipspace(t);
+		switch(*u){
+		case '\0':
+			*t = '\0';
+			p = val = u;
+			break;
+		case ';':
+			*t = '\0';
+			val = "";
+			p = u+1;
+			break;
+		case '=':
+			*t = '\0';
+			val = skipspace(u+1);
+			p = skipvalue(val, isns);
+			if(*p==',')
+				done = 1;
+			if(*p)
+				*p++ = '\0';
+			break;
+		case ',':
+			if(!isns){
+				val = "";
+				p = u;
+				*p++ = '\0';
+				done = 1;
+				break;
+			}
+		default:
+			if(debug)
+				fprint(2, "syntax: %s\n", p);
+			return "syntax error";
+		}
+		for(i=0; i<nelem(stab); i++)
+			if(stab[i].ishttp && cistrcmp(stab[i].s, attr)==0)
+				*(char**)((char*)c+stab[i].offset) = val;
+		if(cistrcmp(attr, "expires") == 0){
+			if(!isns)
+				return "non-netscape cookie has Expires tag";
+			if(!val[0])
+				return "bad expires tag";
+			c->expire = strtotime(val);
+			if(c->expire == ~0)
+				return "cannot parse netscape expires tag";
+		}
+		if(cistrcmp(attr, "max-age") == 0)
+			c->expire = time(0)+atoi(val);
+		if(cistrcmp(attr, "secure") == 0)
+			c->secure = 1;
+	}
+
+	if(c->dom)
+		c->explicitdom = 1;
+	else
+		c->dom = dom;
+	if(c->path)
+		c->explicitpath = 1;
+	else{
+		c->path = path;
+		if((t = strchr(c->path, '?')) != 0)
+			*t = '\0';
+		if((t = strrchr(c->path, '/')) != 0)
+			*t = '\0';
+	}
+	c->netscapestyle = isns;
+	*e = p;
+
+	return nil;
+}
+
+Jar *jar;
+
+enum
+{
+	Xhttp = 1,
+	Xcookies,
+
+	NeedUrl = 0,
+	HaveUrl,
+};
+
+typedef struct Aux Aux;
+struct Aux
+{
+	int state;
+	char *dom;
+	char *path;
+	char *inhttp;
+	char *outhttp;
+	char *ctext;
+	int rdoff;
+};
+enum
+{
+	AuxBuf = 4096,
+	MaxCtext = 16*1024*1024,
+};
+
+void
+fsopen(Req *r)
+{
+	char *s, *es;
+	int i, sz;
+	Aux *a;
+
+	switch((uintptr)r->fid->file->aux){
+	case Xhttp:
+		syncjar(jar);
+		a = emalloc9p(sizeof(Aux));
+		r->fid->aux = a;
+		a->inhttp = emalloc9p(AuxBuf);
+		a->outhttp = emalloc9p(AuxBuf);
+		break;
+
+	case Xcookies:
+		syncjar(jar);
+		a = emalloc9p(sizeof(Aux));
+		r->fid->aux = a;
+		if(r->ifcall.mode&OTRUNC){
+			a->ctext = emalloc9p(1);
+			a->ctext[0] = '\0';
+		}else{
+			sz = 256*jar->nc+1024;	/* BUG should do better */
+			a->ctext = emalloc9p(sz);
+			a->ctext[0] = '\0';
+			s = a->ctext;
+			es = s+sz;
+			for(i=0; i<jar->nc; i++)
+				s = seprint(s, es, "%K\n", &jar->c[i]);
+		}
+		break;
+	}
+	respond(r, nil);
+}
+
+void
+fsread(Req *r)
+{
+	Aux *a;
+
+	a = r->fid->aux;
+	switch((uintptr)r->fid->file->aux){
+	case Xhttp:
+		if(a->state == NeedUrl){
+			respond(r, "must write url before read");
+			return;
+		}
+		r->ifcall.offset = a->rdoff;
+		readstr(r, a->outhttp);
+		a->rdoff += r->ofcall.count;
+		respond(r, nil);
+		return;
+
+	case Xcookies:
+		readstr(r, a->ctext);
+		respond(r, nil);
+		return;
+
+	default:
+		respond(r, "bug in webcookies");
+		return;
+	}
+}
+
+void
+fswrite(Req *r)
+{
+	Aux *a;
+	int i, sz, hlen, issecure;
+	char buf[1024], *p;
+	Jar *j;
+
+	a = r->fid->aux;
+	switch((uintptr)r->fid->file->aux){
+	case Xhttp:
+		if(a->state == NeedUrl){
+			if(r->ifcall.count >= sizeof buf){
+				respond(r, "url too long");
+				return;
+			}
+			memmove(buf, r->ifcall.data, r->ifcall.count);
+			buf[r->ifcall.count] = '\0';
+			issecure = 0;
+			if(cistrncmp(buf, "http://", 7) == 0)
+				hlen = 7;
+			else if(cistrncmp(buf, "https://", 8) == 0){
+				hlen = 8;
+				issecure = 1;
+			}else{
+				respond(r, "url must begin http:// or https://");
+				return;
+			}
+			if(buf[hlen]=='/'){
+				respond(r, "url without host name");
+				return;
+			}
+			p = strchr(buf+hlen, '/');
+			if(p == nil)
+				a->path = estrdup9p("/");
+			else{
+				a->path = estrdup9p(p);
+				*p = '\0';
+			}
+			a->dom = estrdup9p(buf+hlen);
+			a->state = HaveUrl;
+			j = cookiesearch(jar, a->dom, a->path, issecure);
+			if(debug){
+				fprint(2, "search %s %s got %p\n", a->dom, a->path, j);
+				if(j){
+					fprint(2, "%d cookies\n", j->nc);
+					for(i=0; i<j->nc; i++)
+						fprint(2, "%K\n", &j->c[i]);
+				}
+			}
+			snprint(a->outhttp, AuxBuf, "%J", j);
+			if(j)
+				closejar(j);
+		}else{
+			if(strlen(a->inhttp)+r->ifcall.count >= AuxBuf){
+				respond(r, "http headers too large");
+				return;
+			}
+			memmove(a->inhttp+strlen(a->inhttp), r->ifcall.data, r->ifcall.count);
+		}
+		r->ofcall.count = r->ifcall.count;
+		respond(r, nil);
+		return;
+
+	case Xcookies:
+		sz = r->ifcall.count+r->ifcall.offset;
+		if(sz > strlen(a->ctext)){
+			if(sz >= MaxCtext){
+				respond(r, "cookie file too large");
+				return;
+			}
+			a->ctext = erealloc9p(a->ctext, sz+1);
+			a->ctext[sz] = '\0';
+		}
+		memmove(a->ctext+r->ifcall.offset, r->ifcall.data, r->ifcall.count);
+		r->ofcall.count = r->ifcall.count;
+		respond(r, nil);
+		return;
+
+	default:
+		respond(r, "bug in webcookies");
+		return;
+	}
+}
+
+void
+fsdestroyfid(Fid *fid)
+{
+	char *p, *nextp;
+	Aux *a;
+	int i;
+
+	a = fid->aux;
+	if(a == nil)
+		return;
+	switch((uintptr)fid->file->aux){
+	case Xhttp:
+		parsehttp(jar, a->inhttp, a->dom, a->path);
+		break;
+	case Xcookies:
+		for(i=0; i<jar->nc; i++)
+			jar->c[i].mark = 1;
+		for(p=a->ctext; *p; p=nextp){
+			if((nextp = strchr(p, '\n')) != nil)
+				*nextp++ = '\0';
+			else
+				nextp = "";
+			addtojar(jar, p, 0);
+		}
+		for(i=0; i<jar->nc; i++)
+			if(jar->c[i].mark)
+				delcookie(jar, &jar->c[i]);
+		break;
+	}
+	syncjar(jar);
+	free(a->dom);
+	free(a->path);
+	free(a->inhttp);
+	free(a->outhttp);
+	free(a->ctext);
+	free(a);
+}
+
+void
+fsend(Srv*)
+{
+	closejar(jar);
+}
+
+Srv fs = 
+{
+.open=		fsopen,
+.read=		fsread,
+.write=		fswrite,
+.destroyfid=	fsdestroyfid,
+.end=		fsend,
+};
+
+void
+usage(void)
+{
+	fprint(2, "usage: webcookies [-f file] [-m mtpt] [-s service]\n");
+	exits("usage");
+}
+	
+void
+main(int argc, char **argv)
+{
+	char *file, *mtpt, *home, *srv;
+
+	file = nil;
+	srv = nil;
+	mtpt = "/mnt/webcookies";
+	ARGBEGIN{
+	case 'D':
+		chatty9p++;
+		break;
+	case 'd':
+		debug = 1;
+		break;
+	case 'f':
+		file = EARGF(usage());
+		break;
+	case 's':
+		srv = EARGF(usage());
+		break;
+	case 'm':
+		mtpt = EARGF(usage());
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if(argc != 0)
+		usage();
+
+	quotefmtinstall();
+	fmtinstall('J', jarfmt);
+	fmtinstall('K', cookiefmt);
+
+	if(file == nil){
+		home = getenv("home");
+		if(home == nil)
+			sysfatal("no cookie file specified and no $home");
+		file = emalloc9p(strlen(home)+30);
+		strcpy(file, home);
+		strcat(file, "/lib/webcookies");
+	}
+	if(access(file, AEXIST) < 0)
+		close(create(file, OWRITE, 0666));
+
+	jar = readjar(file);
+	if(jar == nil)
+		sysfatal("readjar: %r");
+
+	fs.tree = alloctree("cookie", "cookie", DMDIR|0555, nil);
+	closefile(createfile(fs.tree->root, "http", "cookie", 0666, (void*)Xhttp));
+	closefile(createfile(fs.tree->root, "cookies", "cookie", 0666, (void*)Xcookies));
+
+	postmountsrv(&fs, srv, mtpt, MREPL);
+	exits(nil);
+}