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curl/lib/cookie.c

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C
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/***
RECEIVING COOKIE INFORMATION
============================
struct CookieInfo *cookie_init(char *file);
Inits a cookie struct to store data in a local file. This is always
called before any cookies are set.
int cookies_set(struct CookieInfo *cookie, char *cookie_line);
The 'cookie_line' parameter is a full "Set-cookie:" line as
received from a server.
The function need to replace previously stored lines that this new
line superceeds.
It may remove lines that are expired.
It should return an indication of success/error.
SENDING COOKIE INFORMATION
==========================
struct Cookies *cookie_getlist(struct CookieInfo *cookie,
char *host, char *path, bool secure);
For a given host and path, return a linked list of cookies that
the client should send to the server if used now. The secure
boolean informs the cookie if a secure connection is achieved or
not.
It shall only return cookies that haven't expired.
Example set of cookies:
Set-cookie: PRODUCTINFO=webxpress; domain=.fidelity.com; path=/; secure
Set-cookie: PERSONALIZE=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/ftgw; secure
Set-cookie: FidHist=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: FidOrder=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: DisPend=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: FidDis=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie:
Session_Key@6791a9e0-901a-11d0-a1c8-9b012c88aa77=none;expires=Monday,
13-Jun-1988 03:04:55 GMT; domain=.fidelity.com; path=/; secure
****/
#include "setup.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "cookie.h"
#include "getdate.h"
#include "strequal.h"
/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif
/****************************************************************************
*
* cookie_add()
*
* Add a single cookie line to the cookie keeping object.
*
***************************************************************************/
struct Cookie *cookie_add(struct CookieInfo *c,
bool httpheader, /* TRUE if HTTP header-style line */
char *lineptr) /* first non-space of the line */
{
struct Cookie *clist;
char what[MAX_COOKIE_LINE];
char name[MAX_NAME];
char *ptr;
char *semiptr;
struct Cookie *co;
time_t now = time(NULL);
bool replace_old = FALSE;
/* First, alloc and init a new struct for it */
co = (struct Cookie *)malloc(sizeof(struct Cookie));
if(!co)
return NULL; /* bail out if we're this low on memory */
/* clear the whole struct first */
memset(co, 0, sizeof(struct Cookie));
if(httpheader) {
/* This line was read off a HTTP-header */
semiptr=strchr(lineptr, ';'); /* first, find a semicolon */
ptr = lineptr;
do {
if(semiptr)
*semiptr='\0'; /* zero terminate for a while */
/* we have a <what>=<this> pair or a 'secure' word here */
if(strchr(ptr, '=')) {
name[0]=what[0]=0; /* init the buffers */
if(1 <= sscanf(ptr, "%" MAX_NAME_TXT "[^=]=%"
MAX_COOKIE_LINE_TXT "[^\r\n]",
name, what)) {
/* this is a legal <what>=<this> pair */
if(strequal("path", name)) {
co->path=strdup(what);
}
else if(strequal("domain", name)) {
co->domain=strdup(what);
}
else if(strequal("version", name)) {
co->version=strdup(what);
}
else if(strequal("max-age", name)) {
/* Defined in RFC2109:
Optional. The Max-Age attribute defines the lifetime of the
cookie, in seconds. The delta-seconds value is a decimal non-
negative integer. After delta-seconds seconds elapse, the
client should discard the cookie. A value of zero means the
cookie should be discarded immediately.
*/
co->maxage = strdup(what);
co->expires =
atoi((*co->maxage=='\"')?&co->maxage[1]:&co->maxage[0]);
}
else if(strequal("expires", name)) {
co->expirestr=strdup(what);
co->expires = curl_getdate(what, &now);
}
else if(!co->name) {
co->name = strdup(name);
co->value = strdup(what);
}
else
;/* this is the second (or more) name we don't know
about! */
}
else {
/* this is an "illegal" <what>=<this> pair */
}
}
else {
if(sscanf(ptr, "%" MAX_COOKIE_LINE_TXT "[^\r\n]",
what)) {
if(strequal("secure", what))
co->secure = TRUE;
else
; /* unsupported keyword without assign! */
}
}
if(!semiptr)
continue; /* we already know there are no more cookies */
*semiptr=';'; /* put the semicolon back */
ptr=semiptr+1;
while(ptr && *ptr && isspace((int)*ptr))
ptr++;
semiptr=strchr(ptr, ';'); /* now, find the next semicolon */
} while(semiptr);
}
else {
/* This line is NOT a HTTP header style line, we do offer support for
reading the odd netscape cookies-file format here */
char *firstptr;
int fields;
if(lineptr[0]=='#') {
/* don't even try the comments */
free(co);
return NULL;
}
/* strip off the possible end-of-line characters */
ptr=strchr(lineptr, '\r');
if(ptr)
*ptr=0; /* clear it */
ptr=strchr(lineptr, '\n');
if(ptr)
*ptr=0; /* clear it */
firstptr=strtok(lineptr, "\t"); /* first tokenize it on the TAB */
/* Here's a quick check to eliminate normal HTTP-headers from this */
if(!firstptr || strchr(firstptr, ':')) {
free(co);
return NULL;
}
/* Now loop through the fields and init the struct we already have
allocated */
for(ptr=firstptr, fields=0; ptr; ptr=strtok(NULL, "\t"), fields++) {
switch(fields) {
case 0:
co->domain = strdup(ptr);
break;
case 1:
/* what _is_ this field for? */
break;
case 2:
co->path = strdup(ptr);
break;
case 3:
co->secure = strequal(ptr, "TRUE");
break;
case 4:
co->expires = atoi(ptr);
break;
case 5:
co->name = strdup(ptr);
break;
case 6:
co->value = strdup(ptr);
break;
}
}
if(7 != fields) {
/* we did not find the sufficient number of fields to recognize this
as a valid line, abort and go home */
if(co->domain)
free(co->domain);
if(co->path)
free(co->path);
if(co->name)
free(co->name);
if(co->value)
free(co->value);
free(co);
return NULL;
}
}
/* now, we have parsed the incoming line, we must now check if this
superceeds an already existing cookie, which it may if the previous have
the same domain and path as this */
clist = c->cookies;
replace_old = FALSE;
while(clist) {
if(strequal(clist->name, co->name)) {
/* the names are identical */
if(clist->domain && co->domain) {
if(strequal(clist->domain, co->domain))
replace_old=TRUE;
}
else if(!clist->domain && !co->domain)
replace_old = TRUE;
if(replace_old) {
/* the domains were identical */
if(clist->path && co->path) {
if(strequal(clist->path, co->path)) {
replace_old = TRUE;
}
else
replace_old = FALSE;
}
else if(!clist->path && !co->path)
replace_old = TRUE;
else
replace_old = FALSE;
}
if(replace_old) {
co->next = clist->next; /* get the next-pointer first */
/* then free all the old pointers */
if(clist->name)
free(clist->name);
if(clist->value)
free(clist->value);
if(clist->domain)
free(clist->domain);
if(clist->path)
free(clist->path);
if(clist->expirestr)
free(clist->expirestr);
if(clist->version)
free(clist->version);
if(clist->maxage)
free(clist->maxage);
*clist = *co; /* then store all the new data */
}
}
clist = clist->next;
}
if(!replace_old) {
/* first, point to our "next" */
co->next = c->cookies;
/* then make ourselves first in the list */
c->cookies = co;
}
return co;
}
/*****************************************************************************
*
* cookie_init()
*
* Inits a cookie struct to read data from a local file. This is always
* called before any cookies are set. File may be NULL.
*
****************************************************************************/
struct CookieInfo *cookie_init(char *file)
{
char line[MAX_COOKIE_LINE];
struct CookieInfo *c;
FILE *fp;
bool fromfile=TRUE;
c = (struct CookieInfo *)malloc(sizeof(struct CookieInfo));
if(!c)
return NULL; /* failed to get memory */
memset(c, 0, sizeof(struct CookieInfo));
c->filename = strdup(file?file:"none"); /* copy the name just in case */
if(strequal(file, "-")) {
fp = stdin;
fromfile=FALSE;
}
else
fp = file?fopen(file, "r"):NULL;
if(fp) {
while(fgets(line, MAX_COOKIE_LINE, fp)) {
if(strnequal("Set-Cookie:", line, 11)) {
/* This is a cookie line, get it! */
char *lineptr=&line[11];
while(*lineptr && isspace((int)*lineptr))
lineptr++;
cookie_add(c, TRUE, lineptr);
}
else {
/* This might be a netscape cookie-file line, get it! */
char *lineptr=line;
while(*lineptr && isspace((int)*lineptr))
lineptr++;
cookie_add(c, FALSE, lineptr);
}
}
if(fromfile)
fclose(fp);
}
return c;
}
/*****************************************************************************
*
* cookie_getlist()
*
* For a given host and path, return a linked list of cookies that the
* client should send to the server if used now. The secure boolean informs
* the cookie if a secure connection is achieved or not.
*
* It shall only return cookies that haven't expired.
*
****************************************************************************/
struct Cookie *cookie_getlist(struct CookieInfo *c,
char *host, char *path, bool secure)
{
struct Cookie *newco;
struct Cookie *co;
time_t now = time(NULL);
int hostlen=strlen(host);
int domlen;
struct Cookie *mainco=NULL;
if(!c || !c->cookies)
return NULL; /* no cookie struct or no cookies in the struct */
co = c->cookies;
while(co) {
/* only process this cookie if it is not expired or had no expire
date AND that if the cookie requires we're secure we must only
continue if we are! */
if( (co->expires<=0 || (co->expires> now)) &&
(co->secure?secure:TRUE) ) {
/* now check if the domain is correct */
domlen=co->domain?strlen(co->domain):0;
if(!co->domain ||
((domlen<hostlen) &&
strequal(host+(hostlen-domlen), co->domain)) ) {
/* the right part of the host matches the domain stuff in the
cookie data */
/* now check the left part of the path with the cookies path
requirement */
if(!co->path ||
strnequal(path, co->path, strlen(co->path))) {
/* and now, we know this is a match and we should create an
entry for the return-linked-list */
newco = (struct Cookie *)malloc(sizeof(struct Cookie));
if(newco) {
/* first, copy the whole source cookie: */
memcpy(newco, co, sizeof(struct Cookie));
/* then modify our next */
newco->next = mainco;
/* point the main to us */
mainco = newco;
}
}
}
}
co = co->next;
}
return mainco; /* return the new list */
}
/*****************************************************************************
*
* cookie_freelist()
*
* Free a list previously returned by cookie_getlist();
*
****************************************************************************/
void cookie_freelist(struct Cookie *co)
{
struct Cookie *next;
if(co) {
while(co) {
next = co->next;
free(co); /* we only free the struct since the "members" are all
just copied! */
co = next;
}
}
}
/*****************************************************************************
*
* cookie_cleanup()
*
* Free a "cookie object" previous created with cookie_init().
*
****************************************************************************/
void cookie_cleanup(struct CookieInfo *c)
{
struct Cookie *co;
struct Cookie *next;
if(c) {
if(c->filename)
free(c->filename);
co = c->cookies;
while(co) {
if(co->name)
free(co->name);
if(co->value)
free(co->value);
if(co->domain)
free(co->domain);
if(co->path)
free(co->path);
if(co->expirestr)
free(co->expirestr);
if(co->version)
free(co->version);
if(co->maxage)
free(co->maxage);
next = co->next;
free(co);
co = next;
}
free(c); /* free the base struct as well */
}
}
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