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