* Cookie file system. Allows hget and multiple webfs's to collaborate.

/*
* 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, doread, dowrite;
char *line;
Biobuf *b;
Dir *d;
Qid q;

if(jar->file==nil)
return 0;

doread = 0;
dowrite = jar->dirty;

q = jar->qid;
if((d = dirstat(jar->file)) == nil)
dowrite = 1;
else {
if(q.path != d->qid.path || q.vers != d->qid.vers){
q = d->qid;
doread = 1;
}
free(d);
}

if(!doread && !dowrite)
return 0;

fd = -1;
for(i=0; i<50; i++){
if((fd = create(jar->lockfile, OWRITE, DMEXCL|0600)) < 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;
}

if(doread){
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);

if(dowrite){
i = create(jar->file, OWRITE, 0600);
if(i < 0 || (b = Bfdopen(i, OWRITE)) == nil){
if(debug)
fprint(2, "Bopen write %s: %r", jar->file);
if(i >= 0)
close(i);
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;
}
Bflush(b);
if((d = dirfstat(Bfildes(b))) != nil){
q = d->qid;
free(d);
}
Bterm(b);
}

jar->qid = q;
jar->dirty = 0;

close(fd);
return 0;
}

void
closejar(Jar *jar)
{
int i;

if(jar == nil)
return;
expirejar(jar, 0);
if(jar->dirty)
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->lockfile);
free(jar->file);
free(jar->c);
free(jar);
}

Jar*
readjar(char *file)
{
char *lock, *p;
Jar *jar;

jar = newjar();
file = estrdup9p(file);
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 = 0;

if(syncjar(jar) < 0){
closejar(jar);
return nil;
}
return 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 + (pattern[0]=='.'))==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;
Cookie *c;
uint now;

now = time(0);
j = newjar();
for(i=0; i<jar->nc; i++){
c = &jar->c[i];
if(!c->deleted && (issecure || !c->secure) && iscookiematch(c, dom, path, now))
addcookie(j, c);
}
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(strlen(c->dom)<=2 || memchr(c->dom+1, '.', strlen(c->dom)-2) == 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 && strlen(dom)>strlen(c->dom)
&& 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",
};

memset(&tm, 0, sizeof(tm));

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 = strtol(s, 0, 10);
tm.min = strtol(s+3, 0, 10);
tm.sec = strtol(s+6, 0, 10);
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;
}
*e = p;

if(c->dom){
/* add leading dot for explicit domain */
if(c->dom[0] != '.' && strcmp(ipattr(c->dom), "dom") == 0){
static char ddom[1024];

ddom[0] = '.';
ddom[sizeof(ddom)-1] = '\0';
strncpy(ddom+1, c->dom, sizeof(ddom)-2);
c->dom = ddom;
}
c->explicitdom = 1;
}else
c->dom = dom;
if(c->path)
c->explicitpath = 1;
else {
static char dpath[1024];

/* implicit path is "directory" of request-uri's path component */
dpath[sizeof(dpath)-1] = '\0';
strncpy(dpath, path, sizeof(dpath)-1);
if((t = strrchr(dpath, '/')) != nil)
t[1] = '\0';
c->path = dpath;
}
c->netscapestyle = isns;

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';

if((p = strchr(a->path, '#')) != nil)
*p = '\0';
if((p = strchr(a->path, '?')) != nil)
*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);
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;
}
if(jar->dirty)
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");
}

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);
}