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netsurf/content/urldb.c
Vincent Sanders f37e52c394 Move bitmap operations into an operation table. 
The generic bitmap handlers provided by each frontend are called back
from the core and therefore should be in an operation table. This was
one of the very few remaining interfaces stopping the core code from
being split into a library.
2015-04-13 23:19:04 +01:00

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/*
* Copyright 2006 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2009 John Tytgat <joty@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* Unified URL information database implementation
*
* URLs are stored in a tree-based structure as follows:
*
* The host component is extracted from each URL and, if a FQDN, split on
* every '.'.The tree is constructed by inserting each FQDN segment in
* reverse order. Duplicate nodes are merged.
*
* If the host part of an URL is an IP address, then this is added to the
* tree verbatim (as if it were a TLD).
*
* This provides something looking like:
*
* root (a sentinel)
* |
* -------------------------------------------------
* | | | | | | |
* com edu gov 127.0.0.1 net org uk TLDs
* | | | | | |
* google ... ... ... ... co 2LDs
* | |
* www bbc Hosts/Subdomains
* |
* www ...
*
* Each of the nodes in this tree is a struct host_part. This stores the
* FQDN segment (or IP address) with which the node is concerned. Each node
* may contain further information about paths on a host (struct path_data)
* or SSL certificate processing on a host-wide basis
* (host_part::permit_invalid_certs).
*
* Path data is concerned with storing various metadata about the path in
* question. This includes global history data, HTTP authentication details
* and any associated HTTP cookies. This is stored as a tree of path segments
* hanging off the relevant host_part node.
*
* Therefore, to find the last visited time of the URL
* http://www.example.com/path/to/resource.html, the FQDN tree would be
* traversed in the order root -> "com" -> "example" -> "www". The "www"
* node would have attached to it a tree of struct path_data:
*
* (sentinel)
* |
* path
* |
* to
* |
* resource.html
*
* This represents the absolute path "/path/to/resource.html". The leaf node
* "resource.html" contains the last visited time of the resource.
*
* The mechanism described above is, however, not particularly conducive to
* fast searching of the database for a given URL (or URLs beginning with a
* given prefix). Therefore, an anciliary data structure is used to enable
* fast searching. This structure simply reflects the contents of the
* database, with entries being added/removed at the same time as for the
* core database. In order to ensure that degenerate cases are kept to a
* minimum, we use an AAtree. This is an approximation of a Red-Black tree
* with similar performance characteristics, but with a significantly
* simpler implementation. Entries in this tree comprise pointers to the
* leaf nodes of the host tree described above.
*
* REALLY IMPORTANT NOTE: urldb expects all URLs to be normalised. Use of
* non-normalised URLs with urldb will result in undefined behaviour and
* potential crashes.
*/
#include <assert.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <curl/curl.h>
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/corestrings.h"
#include "utils/url.h"
#include "utils/utils.h"
#include "utils/bloom.h"
#include "image/bitmap.h"
#include "desktop/cookie_manager.h"
#include "desktop/gui_internal.h"
#include "content/content.h"
#include "content/urldb.h"
struct cookie_internal_data {
char *name; /**< Cookie name */
char *value; /**< Cookie value */
bool value_was_quoted; /**< Value was quoted in Set-Cookie: */
char *comment; /**< Cookie comment */
bool domain_from_set; /**< Domain came from Set-Cookie: header */
char *domain; /**< Domain */
bool path_from_set; /**< Path came from Set-Cookie: header */
char *path; /**< Path */
time_t expires; /**< Expiry timestamp, or -1 for session */
time_t last_used; /**< Last used time */
bool secure; /**< Only send for HTTPS requests */
bool http_only; /**< Only expose to HTTP(S) requests */
cookie_version version; /**< Specification compliance */
bool no_destroy; /**< Never destroy this cookie,
* unless it's expired */
struct cookie_internal_data *prev; /**< Previous in list */
struct cookie_internal_data *next; /**< Next in list */
};
/* A protection space is defined as a tuple canonical_root_url and realm.
* This structure lives as linked list element in a leaf host_part struct
* so we need additional scheme and port to have a canonical_root_url. */
struct prot_space_data {
lwc_string *scheme; /**< URL scheme of canonical hostname of this
* protection space. */
unsigned int port; /**< Port number of canonical hostname of this
* protection space. When 0, it means the
* default port for given scheme, i.e. 80
* (http), 443 (https). */
char *realm; /**< Protection realm */
char *auth; /**< Authentication details for this
* protection space in form
* username:password */
struct prot_space_data *next; /**< Next sibling */
};
struct cache_internal_data {
char filename[12]; /**< Cached filename, or first byte 0 for none */
};
struct url_internal_data {
char *title; /**< Resource title */
unsigned int visits; /**< Visit count */
time_t last_visit; /**< Last visit time */
content_type type; /**< Type of resource */
};
struct path_data {
nsurl *url; /**< Full URL */
lwc_string *scheme; /**< URL scheme for data */
unsigned int port; /**< Port number for data. When 0, it means
* the default port for given scheme, i.e.
* 80 (http), 443 (https). */
char *segment; /**< Path segment for this node */
unsigned int frag_cnt; /**< Number of entries in path_data::fragment */
char **fragment; /**< Array of fragments */
bool persistent; /**< This entry should persist */
struct bitmap *thumb; /**< Thumbnail image of resource */
struct url_internal_data urld; /**< URL data for resource */
struct cache_internal_data cache; /**< Cache data for resource */
const struct prot_space_data *prot_space; /**< Protection space
* to which this resource belongs too. Can be
* NULL when it does not belong to a protection
* space or when it is not known. No
* ownership (is with struct host_part::prot_space). */
struct cookie_internal_data *cookies; /**< Cookies associated with resource */
struct cookie_internal_data *cookies_end; /**< Last cookie in list */
struct path_data *next; /**< Next sibling */
struct path_data *prev; /**< Previous sibling */
struct path_data *parent; /**< Parent path segment */
struct path_data *children; /**< Child path segments */
struct path_data *last; /**< Last child */
};
struct host_part {
/**< Known paths on this host. This _must_ be first so that
* struct host_part *h = (struct host_part *)mypath; works */
struct path_data paths;
bool permit_invalid_certs; /**< Allow access to SSL protected
* resources on this host without
* verifying certificate authenticity
*/
char *part; /**< Part of host string */
struct prot_space_data *prot_space; /**< Linked list of all known
* proctection spaces known for his host and
* all its schems and ports. */
struct host_part *next; /**< Next sibling */
struct host_part *prev; /**< Previous sibling */
struct host_part *parent; /**< Parent host part */
struct host_part *children; /**< Child host parts */
};
struct search_node {
const struct host_part *data; /**< Host tree entry */
unsigned int level; /**< Node level */
struct search_node *left; /**< Left subtree */
struct search_node *right; /**< Right subtree */
};
/** Root database handle */
static struct host_part db_root;
/** Search trees - one per letter + 1 for IPs + 1 for Everything Else */
#define NUM_SEARCH_TREES 28
#define ST_IP 0
#define ST_EE 1
#define ST_DN 2
static struct search_node empty = { 0, 0, &empty, &empty };
static struct search_node *search_trees[NUM_SEARCH_TREES] = {
&empty, &empty, &empty, &empty, &empty, &empty, &empty, &empty,
&empty, &empty, &empty, &empty, &empty, &empty, &empty, &empty,
&empty, &empty, &empty, &empty, &empty, &empty, &empty, &empty,
&empty, &empty, &empty, &empty
};
#define MIN_COOKIE_FILE_VERSION 100
#define COOKIE_FILE_VERSION 102
static int loaded_cookie_file_version;
#define MIN_URL_FILE_VERSION 106
/** URL database file version */
#define URL_FILE_VERSION 106
/* Bloom filter used for short-circuting the false case of "is this
* URL in the database?". BLOOM_SIZE controls how large the filter is
* in bytes. Primitive experimentation shows that for a filter of X
* bytes filled with X items, searching for X items not in the filter
* has a 5% false-positive rate. We set it to 32kB, which should be
* enough for all but the largest databases, while not being shockingly
* wasteful on memory.
*/
static struct bloom_filter *url_bloom;
#define BLOOM_SIZE (1024 * 32)
/**
* Write paths associated with a host
*
* \param parent Root of (sub)tree to write
* \param host Current host name
* \param fp File to write to
* \param path Current path string
* \param path_alloc Allocated size of path
* \param path_used Used size of path
* \param expiry Expiry time of URLs
*/
static void urldb_write_paths(const struct path_data *parent, const char *host,
FILE *fp, char **path, int *path_alloc, int *path_used,
time_t expiry)
{
const struct path_data *p = parent;
int i;
do {
int seglen = p->segment != NULL ? strlen(p->segment) : 0;
int len = *path_used + seglen + 1;
if (*path_alloc < len) {
char *temp = realloc(*path,
(len > 64) ? len : *path_alloc + 64);
if (!temp)
return;
*path = temp;
*path_alloc = (len > 64) ? len : *path_alloc + 64;
}
if (p->segment != NULL)
memcpy(*path + *path_used - 1, p->segment, seglen);
if (p->children != NULL) {
(*path)[*path_used + seglen - 1] = '/';
(*path)[*path_used + seglen] = '\0';
} else {
(*path)[*path_used + seglen - 1] = '\0';
len -= 1;
}
*path_used = len;
if (p->children != NULL) {
/* Drill down into children */
p = p->children;
} else {
/* leaf node */
if (p->persistent ||((p->urld.last_visit > expiry) &&
(p->urld.visits > 0))) {
fprintf(fp, "%s\n", lwc_string_data(p->scheme));
if (p->port)
fprintf(fp,"%d\n", p->port);
else
fprintf(fp, "\n");
fprintf(fp, "%s\n", *path);
/** \todo handle fragments? */
fprintf(fp, "%i\n%i\n%i\n", p->urld.visits,
(int)p->urld.last_visit,
(int)p->urld.type);
fprintf(fp, "\n");
if (p->urld.title) {
uint8_t *s = (uint8_t *) p->urld.title;
for (i = 0; s[i] != '\0'; i++)
if (s[i] < 32)
s[i] = ' ';
for (--i; ((i > 0) && (s[i] == ' '));
i--)
s[i] = '\0';
fprintf(fp, "%s\n", p->urld.title);
} else
fprintf(fp, "\n");
}
/* Now, find next node to process. */
while (p != parent) {
int seglen = p->segment != NULL
? strlen(p->segment) : 0;
/* Remove our segment from the path */
*path_used -= seglen;
(*path)[*path_used - 1] = '\0';
if (p->next != NULL) {
/* Have a sibling, process that */
p = p->next;
break;
}
/* Going up, so remove '/' */
*path_used -= 1;
(*path)[*path_used - 1] = '\0';
/* Ascend tree */
p = p->parent;
}
}
} while (p != parent);
}
/**
* Count number of URLs associated with a host
*
* \param root Root of path data tree
* \param expiry Expiry time for URLs
* \param count Pointer to count
*/
static void urldb_count_urls(const struct path_data *root, time_t expiry,
unsigned int *count)
{
const struct path_data *p = root;
do {
if (p->children != NULL) {
/* Drill down into children */
p = p->children;
} else {
/* No more children, increment count if required */
if (p->persistent || ((p->urld.last_visit > expiry) &&
(p->urld.visits > 0))) {
(*count)++;
}
/* Now, find next node to process. */
while (p != root) {
if (p->next != NULL) {
/* Have a sibling, process that */
p = p->next;
break;
}
/* Ascend tree */
p = p->parent;
}
}
} while (p != root);
}
/**
* Save a search (sub)tree
*
* \param parent root node of search tree to save.
* \param fp File to write to
*/
static void urldb_save_search_tree(struct search_node *parent, FILE *fp)
{
char host[256];
const struct host_part *h;
unsigned int path_count = 0;
char *path, *p, *end;
int path_alloc = 64, path_used = 1;
time_t expiry;
expiry = time(NULL) - ((60 * 60 * 24) * nsoption_int(expire_url));
if (parent == &empty)
return;
urldb_save_search_tree(parent->left, fp);
path = malloc(path_alloc);
if (!path)
return;
path[0] = '\0';
for (h = parent->data, p = host, end = host + sizeof host;
h && h != &db_root && p < end; h = h->parent) {
int written = snprintf(p, end - p, "%s%s", h->part,
(h->parent && h->parent->parent) ? "." : "");
if (written < 0) {
free(path);
return;
}
p += written;
}
urldb_count_urls(&parent->data->paths, expiry, &path_count);
if (path_count > 0) {
fprintf(fp, "%s\n%i\n", host, path_count);
urldb_write_paths(&parent->data->paths, host, fp,
&path, &path_alloc, &path_used, expiry);
}
free(path);
urldb_save_search_tree(parent->right, fp);
}
/**
* Path data iterator (internal)
*
* \param parent Root of subtree to iterate over
* \param url_callback Callback function
* \param cookie_callback Callback function
* \return true to continue, false otherwise
*/
static bool urldb_iterate_entries_path(const struct path_data *parent,
bool (*url_callback)(nsurl *url, const struct url_data *data),
bool (*cookie_callback)(const struct cookie_data *data))
{
const struct path_data *p = parent;
const struct cookie_data *c;
do {
if (p->children != NULL) {
/* Drill down into children */
p = p->children;
} else {
/* All leaf nodes in the path tree should have an URL or
* cookies attached to them. If this is not the case, it
* indicates that there's a bug in the file loader/URL
* insertion code. Therefore, assert this here. */
assert(url_callback || cookie_callback);
/** \todo handle fragments? */
if (url_callback) {
const struct url_internal_data *u = &p->urld;
assert(p->url);
if (!url_callback(p->url,
(const struct url_data *) u))
return false;
} else {
c = (const struct cookie_data *)p->cookies;
for (; c != NULL; c = c->next) {
if (!cookie_callback(c))
return false;
}
}
/* Now, find next node to process. */
while (p != parent) {
if (p->next != NULL) {
/* Have a sibling, process that */
p = p->next;
break;
}
/* Ascend tree */
p = p->parent;
}
}
} while (p != parent);
return true;
}
/**
* Check whether a host string is an IP address.
*
* This call detects IPv4 addresses (all of dotted-quad or subsets,
* decimal or hexadecimal notations) and IPv6 addresses (including
* those containing embedded IPv4 addresses.)
*
* \param host a hostname terminated by '\0'
* \return true if the hostname is an IP address, false otherwise
*/
static bool urldb__host_is_ip_address(const char *host)
{
struct in_addr ipv4;
size_t host_len = strlen(host);
const char *sane_host;
const char *slash;
#ifndef NO_IPV6
struct in6_addr ipv6;
char ipv6_addr[64];
#endif
/** @todo FIXME Some parts of urldb.c make confusions between hosts
* and "prefixes", we can sometimes be erroneously passed more than
* just a host. Sometimes we may be passed trailing slashes, or even
* whole path segments. A specific criminal in this class is
* urldb_iterate_partial, which takes a prefix to search for, but
* passes that prefix to functions that expect only hosts.
*
* For the time being, we will accept such calls; we check if there
* is a / in the host parameter, and if there is, we take a copy and
* replace the / with a \0. This is not a permanent solution; we
* should search through NetSurf and find all the callers that are
* in error and fix them. When doing this task, it might be wise
* to replace the hideousness below with code that doesn't have to do
* this, and add assert(strchr(host, '/') == NULL); somewhere.
* -- rjek - 2010-11-04
*/
slash = strchr(host, '/');
if (slash == NULL) {
sane_host = host;
} else {
char *c = strdup(host);
c[slash - host] = '\0';
sane_host = c;
host_len = slash - host - 1;
LOG(("WARNING: called with non-host '%s'", host));
}
if (strspn(sane_host, "0123456789abcdefABCDEF[].:") < host_len)
goto out_false;
if (inet_aton(sane_host, &ipv4) != 0) {
/* This can only be a sane IPv4 address if it contains 3 dots.
* Helpfully, inet_aton is happy to treat "a", "a.b", "a.b.c",
* and "a.b.c.d" as valid IPv4 address strings where we only
* support the full, dotted-quad, form.
*/
int num_dots = 0;
size_t index;
for (index = 0; index < host_len; index++) {
if (sane_host[index] == '.')
num_dots++;
}
if (num_dots == 3)
goto out_true;
else
goto out_false;
}
#ifndef NO_IPV6
if (sane_host[0] != '[' || sane_host[host_len] != ']')
goto out_false;
strncpy(ipv6_addr, sane_host + 1, sizeof(ipv6_addr));
ipv6_addr[sizeof(ipv6_addr) - 1] = '\0';
if (inet_pton(AF_INET6, ipv6_addr, &ipv6) == 1)
goto out_true;
#endif
out_false:
if (slash != NULL) free((void *)sane_host);
return false;
out_true:
if (slash != NULL) free((void *)sane_host);
return true;
}
/**
* Compare host_part with prefix
*
* \param a
* \param b
* \return 0 if match, non-zero, otherwise
*/
static int urldb_search_match_prefix(const struct host_part *a, const char *b)
{
const char *end, *dot;
int plen, ret;
assert(a && a != &db_root && b);
if (urldb__host_is_ip_address(b)) {
/* IP address */
return strncasecmp(a->part, b, strlen(b));
}
end = b + strlen(b) + 1;
while (b < end && a && a != &db_root) {
dot = strchr(b, '.');
if (!dot) {
/* last segment */
dot = end - 1;
}
/* Compare strings (length limited) */
if ((ret = strncasecmp(a->part, b, dot - b)) != 0)
/* didn't match => return difference */
return ret;
/* The strings matched */
if (dot < end - 1) {
/* Consider segment lengths only in the case
* where the prefix contains segments */
plen = strlen(a->part);
if (plen > dot - b)
/* len(a) > len(b) */
return 1;
else if (plen < dot - b)
/* len(a) < len(b) */
return -1;
}
b = dot + 1;
a = a->parent;
}
/* If we get here then either:
* a) The path lengths differ
* or b) The hosts are identical
*/
if (a && a != &db_root && b >= end)
/* len(a) > len(b) => prefix matches */
return 0;
else if ((!a || a == &db_root) && b < end)
/* len(a) < len(b) => prefix does not match */
return -1;
/* Identical */
return 0;
}
/**
* Partial host iterator (internal)
*
* \param root Root of (sub)tree to traverse
* \param prefix Prefix to match
* \param callback Callback function
* \return true to continue, false otherwise
*/
static bool
urldb_iterate_partial_host(struct search_node *root,
const char *prefix,
bool (*callback)(nsurl *url, const struct url_data *data))
{
int c;
assert(root && prefix && callback);
if (root == &empty)
return true;
c = urldb_search_match_prefix(root->data, prefix);
if (c > 0)
/* No match => look in left subtree */
return urldb_iterate_partial_host(root->left, prefix,
callback);
else if (c < 0)
/* No match => look in right subtree */
return urldb_iterate_partial_host(root->right, prefix,
callback);
else {
/* Match => iterate over l/r subtrees & process this node */
if (!urldb_iterate_partial_host(root->left, prefix,
callback))
return false;
if (root->data->paths.children) {
/* and extract all paths attached to this host */
if (!urldb_iterate_entries_path(&root->data->paths,
callback, NULL)) {
return false;
}
}
if (!urldb_iterate_partial_host(root->right, prefix,
callback))
return false;
}
return true;
}
/**
* Partial path iterator (internal)
*
* \param parent Root of (sub)tree to traverse
* \param prefix Prefix to match
* \param callback Callback function
* \return true to continue, false otherwise
*/
static bool urldb_iterate_partial_path(const struct path_data *parent,
const char *prefix, bool (*callback)(nsurl *url,
const struct url_data *data))
{
const struct path_data *p = parent->children;
const char *slash, *end = prefix + strlen(prefix);
/*
* Given: http://www.example.org/a/b/c/d//e
* and assuming a path tree:
* .
* / \
* a1 b1
* / \
* a2 b2
* /|\
* a b c
* 3 3 |
* d
* |
* e
* / \
* f g
*
* Prefix will be: p will be:
*
* a/b/c/d//e a1
* b/c/d//e a2
* b/c/d//e b3
* c/d//e a3
* c/d//e b3
* c/d//e c
* d//e d
* /e e (skip /)
* e e
*
* I.E. we perform a breadth-first search of the tree.
*/
do {
slash = strchr(prefix, '/');
if (!slash)
slash = end;
if (slash == prefix && *prefix == '/') {
/* Ignore "//" */
prefix++;
continue;
}
if (strncasecmp(p->segment, prefix, slash - prefix) == 0) {
/* prefix matches so far */
if (slash == end) {
/* we've run out of prefix, so all
* paths below this one match */
if (!urldb_iterate_entries_path(p, callback,
NULL))
return false;
/* Progress to next sibling */
p = p->next;
} else {
/* Skip over this segment */
prefix = slash + 1;
p = p->children;
}
} else {
/* Doesn't match this segment, try next sibling */
p = p->next;
}
} while (p != NULL);
return true;
}
/**
* Host data iterator (internal)
*
* \param parent Root of subtree to iterate over
* \param url_callback Callback function
* \param cookie_callback Callback function
* \return true to continue, false otherwise
*/
static bool urldb_iterate_entries_host(struct search_node *parent,
bool (*url_callback)(nsurl *url,
const struct url_data *data),
bool (*cookie_callback)(const struct cookie_data *data))
{
if (parent == &empty)
return true;
if (!urldb_iterate_entries_host(parent->left,
url_callback, cookie_callback))
return false;
if ((parent->data->paths.children) || ((cookie_callback) &&
(parent->data->paths.cookies))) {
/* We have paths (or domain cookies), so iterate them */
if (!urldb_iterate_entries_path(&parent->data->paths,
url_callback, cookie_callback)) {
return false;
}
}
if (!urldb_iterate_entries_host(parent->right,
url_callback, cookie_callback))
return false;
return true;
}
/**
* Add a host node to the tree
*
* \param part Host segment to add (or whole IP address) (copied)
* \param parent Parent node to add to
* \return Pointer to added node, or NULL on memory exhaustion
*/
static struct host_part *urldb_add_host_node(const char *part,
struct host_part *parent)
{
struct host_part *d;
assert(part && parent);
d = calloc(1, sizeof(struct host_part));
if (!d)
return NULL;
d->part = strdup(part);
if (!d->part) {
free(d);
return NULL;
}
d->next = parent->children;
if (parent->children)
parent->children->prev = d;
d->parent = parent;
parent->children = d;
return d;
}
/**
* Fragment comparator callback for qsort
*/
static int urldb_add_path_fragment_cmp(const void *a, const void *b)
{
return strcasecmp(*((const char **) a), *((const char **) b));
}
/**
* Add a fragment to a path segment
*
* \param segment Path segment to add to
* \param fragment Fragment to add (copied), or NULL
* \return segment or NULL on memory exhaustion
*/
static struct path_data *
urldb_add_path_fragment(struct path_data *segment, lwc_string *fragment)
{
char **temp;
assert(segment);
/* If no fragment, this function is a NOP
* This may seem strange, but it makes the rest
* of the code cleaner */
if (!fragment)
return segment;
temp = realloc(segment->fragment,
(segment->frag_cnt + 1) * sizeof(char *));
if (!temp)
return NULL;
segment->fragment = temp;
segment->fragment[segment->frag_cnt] =
strdup(lwc_string_data(fragment));
if (!segment->fragment[segment->frag_cnt]) {
/* Don't free temp - it's now our buffer */
return NULL;
}
segment->frag_cnt++;
/* We want fragments in alphabetical order, so sort them
* It may prove better to insert in alphabetical order instead */
qsort(segment->fragment, segment->frag_cnt, sizeof (char *),
urldb_add_path_fragment_cmp);
return segment;
}
/**
* Add a path node to the tree
*
* \param scheme URL scheme associated with path (copied)
* \param port Port number on host associated with path
* \param segment Path segment to add (copied)
* \param fragment URL fragment (copied), or NULL
* \param parent Parent node to add to
* \return Pointer to added node, or NULL on memory exhaustion
*/
static struct path_data *
urldb_add_path_node(lwc_string *scheme, unsigned int port,
const char *segment, lwc_string *fragment,
struct path_data *parent)
{
struct path_data *d, *e;
assert(scheme && segment && parent);
d = calloc(1, sizeof(struct path_data));
if (!d)
return NULL;
d->scheme = lwc_string_ref(scheme);
d->port = port;
d->segment = strdup(segment);
if (!d->segment) {
lwc_string_unref(d->scheme);
free(d);
return NULL;
}
if (fragment) {
if (!urldb_add_path_fragment(d, fragment)) {
free(d->segment);
lwc_string_unref(d->scheme);
free(d);
return NULL;
}
}
for (e = parent->children; e; e = e->next) {
if (strcmp(e->segment, d->segment) > 0)
break;
}
if (e) {
d->prev = e->prev;
d->next = e;
if (e->prev)
e->prev->next = d;
else
parent->children = d;
e->prev = d;
} else if (!parent->children) {
d->prev = d->next = NULL;
parent->children = parent->last = d;
} else {
d->next = NULL;
d->prev = parent->last;
parent->last->next = d;
parent->last = d;
}
d->parent = parent;
return d;
}
/**
* Get the search tree for a particular host
*
* \param host the host to lookup
* \return the corresponding search tree
*/
static struct search_node **urldb_get_search_tree_direct(const char *host)
{
assert(host);
if (urldb__host_is_ip_address(host))
return &search_trees[ST_IP];
else if (isalpha(*host))
return &search_trees[ST_DN + tolower(*host) - 'a'];
return &search_trees[ST_EE];
}
/**
* Get the search tree for a particular host
*
* \param host the host to lookup
* \return the corresponding search tree
*/
static struct search_node *urldb_get_search_tree(const char *host)
{
return *urldb_get_search_tree_direct(host);
}
/**
* Compare host_part with a string
*
* \param a
* \param b
* \return 0 if match, non-zero, otherwise
*/
static int urldb_search_match_string(const struct host_part *a, const char *b)
{
const char *end, *dot;
int plen, ret;
assert(a && a != &db_root && b);
if (urldb__host_is_ip_address(b)) {
/* IP address */
return strcasecmp(a->part, b);
}
end = b + strlen(b) + 1;
while (b < end && a && a != &db_root) {
dot = strchr(b, '.');
if (!dot) {
/* last segment */
dot = end - 1;
}
/* Compare strings (length limited) */
if ((ret = strncasecmp(a->part, b, dot - b)) != 0)
/* didn't match => return difference */
return ret;
/* The strings matched, now check that the lengths do, too */
plen = strlen(a->part);
if (plen > dot - b)
/* len(a) > len(b) */
return 1;
else if (plen < dot - b)
/* len(a) < len(b) */
return -1;
b = dot + 1;
a = a->parent;
}
/* If we get here then either:
* a) The path lengths differ
* or b) The hosts are identical
*/
if (a && a != &db_root && b >= end)
/* len(a) > len(b) */
return 1;
else if ((!a || a == &db_root) && b < end)
/* len(a) < len(b) */
return -1;
/* Identical */
return 0;
}
/**
* Find a node in a search tree
*
* \param root Tree to look in
* \param host Host to find
* \return Pointer to host tree node, or NULL if not found
*/
static const struct host_part *
urldb_search_find(struct search_node *root, const char *host)
{
int c;
assert(root && host);
if (root == &empty) {
return NULL;
}
c = urldb_search_match_string(root->data, host);
if (c > 0)
return urldb_search_find(root->left, host);
else if (c < 0)
return urldb_search_find(root->right, host);
else
return root->data;
}
/**
* Match a path string
*
* \param parent Path (sub)tree to look in
* \param path The path to search for
* \param scheme The URL scheme associated with the path
* \param port The port associated with the path
* \return Pointer to path data or NULL if not found.
*/
static struct path_data *urldb_match_path(const struct path_data *parent,
const char *path, lwc_string *scheme, unsigned short port)
{
const struct path_data *p;
const char *slash;
bool match;
assert(parent != NULL);
assert(parent->segment == NULL);
if (path[0] != '/') {
LOG(("path is %s", path));
}
assert(path[0] == '/');
/* Start with children, as parent has no segment */
p = parent->children;
while (p != NULL) {
slash = strchr(path + 1, '/');
if (!slash)
slash = path + strlen(path);
if (strncmp(p->segment, path + 1, slash - path - 1) == 0 &&
lwc_string_isequal(p->scheme, scheme, &match) ==
lwc_error_ok &&
match == true &&
p->port == port) {
if (*slash == '\0') {
/* Complete match */
return (struct path_data *) p;
}
/* Match so far, go down tree */
p = p->children;
path = slash;
} else {
/* No match, try next sibling */
p = p->next;
}
}
return NULL;
}
/**
* Find an URL in the database
*
* \param url Absolute URL to find
* \return Pointer to path data, or NULL if not found
*/
static struct path_data *urldb_find_url(nsurl *url)
{
const struct host_part *h;
struct path_data *p;
struct search_node *tree;
char *plq;
const char *host_str;
lwc_string *scheme, *host, *port;
size_t len = 0;
unsigned int port_int;
bool match;
assert(url);
if (url_bloom != NULL) {
if (bloom_search_hash(url_bloom,
nsurl_hash(url)) == false) {
return NULL;
}
}
scheme = nsurl_get_component(url, NSURL_SCHEME);
if (scheme == NULL)
return NULL;
host = nsurl_get_component(url, NSURL_HOST);
if (host != NULL) {
host_str = lwc_string_data(host);
lwc_string_unref(host);
} else if (lwc_string_isequal(scheme, corestring_lwc_file, &match) ==
lwc_error_ok && match == true) {
host_str = "localhost";
} else {
lwc_string_unref(scheme);
return NULL;
}
tree = urldb_get_search_tree(host_str);
h = urldb_search_find(tree, host_str);
if (!h) {
lwc_string_unref(scheme);
return NULL;
}
/* generate plq (path, leaf, query) */
if (nsurl_get(url, NSURL_PATH | NSURL_QUERY, &plq, &len) !=
NSERROR_OK) {
lwc_string_unref(scheme);
return NULL;
}
/* Get port */
port = nsurl_get_component(url, NSURL_PORT);
if (port != NULL) {
port_int = atoi(lwc_string_data(port));
lwc_string_unref(port);
} else {
port_int = 0;
}
p = urldb_match_path(&h->paths, plq, scheme, port_int);
free(plq);
lwc_string_unref(scheme);
return p;
}
/**
* Dump URL database paths to stderr
*
* \param parent Parent node of tree to dump
*/
static void urldb_dump_paths(struct path_data *parent)
{
const struct path_data *p = parent;
unsigned int i;
do {
if (p->segment != NULL) {
LOG(("\t%s : %u", lwc_string_data(p->scheme), p->port));
LOG(("\t\t'%s'", p->segment));
for (i = 0; i != p->frag_cnt; i++)
LOG(("\t\t\t#%s", p->fragment[i]));
}
if (p->children != NULL) {
p = p->children;
} else {
while (p != parent) {
if (p->next != NULL) {
p = p->next;
break;
}
p = p->parent;
}
}
} while (p != parent);
}
/**
* Dump URL database hosts to stderr
*
* \param parent Parent node of tree to dump
*/
static void urldb_dump_hosts(struct host_part *parent)
{
struct host_part *h;
if (parent->part) {
LOG(("%s", parent->part));
LOG(("\t%s invalid SSL certs",
parent->permit_invalid_certs ? "Permits" : "Denies"));
}
/* Dump path data */
urldb_dump_paths(&parent->paths);
/* and recurse */
for (h = parent->children; h; h = h->next)
urldb_dump_hosts(h);
}
/**
* Dump search tree
*
* \param parent Parent node of tree to dump
* \param depth Tree depth
*/
static void urldb_dump_search(struct search_node *parent, int depth)
{
const struct host_part *h;
int i;
if (parent == &empty)
return;
urldb_dump_search(parent->left, depth + 1);
for (i = 0; i != depth; i++)
fputc(' ', stderr);
for (h = parent->data; h; h = h->parent) {
if (h->part)
fprintf(stderr, "%s", h->part);
if (h->parent && h->parent->parent)
fputc('.', stderr);
}
fputc('\n', stderr);
urldb_dump_search(parent->right, depth + 1);
}
/**
* Compare a pair of host_parts
*
* \param a
* \param b
* \return 0 if match, non-zero, otherwise
*/
static int
urldb_search_match_host(const struct host_part *a, const struct host_part *b)
{
int ret;
assert(a && b);
/* traverse up tree to root, comparing parts as we go. */
for (; a && a != &db_root && b && b != &db_root;
a = a->parent, b = b->parent)
if ((ret = strcasecmp(a->part, b->part)) != 0)
/* They differ => return the difference here */
return ret;
/* If we get here then either:
* a) The path lengths differ
* or b) The hosts are identical
*/
if (a && a != &db_root && (!b || b == &db_root))
/* len(a) > len(b) */
return 1;
else if ((!a || a == &db_root) && b && b != &db_root)
/* len(a) < len(b) */
return -1;
/* identical */
return 0;
}
/**
* Rotate a subtree right
*
* \param root Root of subtree to rotate
* \return new root of subtree
*/
static struct search_node *urldb_search_skew(struct search_node *root)
{
struct search_node *temp;
assert(root);
if (root->left->level == root->level) {
temp = root->left;
root->left = temp->right;
temp->right = root;
root = temp;
}
return root;
}
/**
* Rotate a node left, increasing the parent's level
*
* \param root Root of subtree to rotate
* \return New root of subtree
*/
static struct search_node *urldb_search_split(struct search_node *root)
{
struct search_node *temp;
assert(root);
if (root->right->right->level == root->level) {
temp = root->right;
root->right = temp->left;
temp->left = root;
root = temp;
root->level++;
}
return root;
}
/**
* Insert node into search tree
*
* \param root Root of (sub)tree to insert into
* \param n Node to insert
* \return Pointer to updated root
*/
static struct search_node *
urldb_search_insert_internal(struct search_node *root, struct search_node *n)
{
assert(root && n);
if (root == &empty) {
root = n;
} else {
int c = urldb_search_match_host(root->data, n->data);
if (c > 0) {
root->left = urldb_search_insert_internal(
root->left, n);
} else if (c < 0) {
root->right = urldb_search_insert_internal(
root->right, n);
} else {
/* exact match */
free(n);
return root;
}
root = urldb_search_skew(root);
root = urldb_search_split(root);
}
return root;
}
/**
* Insert a node into the search tree
*
* \param root Root of tree to insert into
* \param data User data to insert
* \return Pointer to updated root, or NULL if failed
*/
static struct search_node *
urldb_search_insert(struct search_node *root, const struct host_part *data)
{
struct search_node *n;
assert(root && data);
n = malloc(sizeof(struct search_node));
if (!n)
return NULL;
n->level = 1;
n->data = data;
n->left = n->right = &empty;
root = urldb_search_insert_internal(root, n);
return root;
}
/**
* Parse a cookie avpair
*
* \param c Cookie struct to populate
* \param n Name component
* \param v Value component
* \param was_quoted Whether \a v was quoted in the input
* \return true on success, false on memory exhaustion
*/
static bool urldb_parse_avpair(struct cookie_internal_data *c, char *n,
char *v, bool was_quoted)
{
int vlen;
assert(c && n && v);
/* Strip whitespace from start of name */
for (; *n; n++) {
if (*n != ' ' && *n != '\t')
break;
}
/* Strip whitespace from end of name */
for (vlen = strlen(n); vlen; vlen--) {
if (n[vlen] == ' ' || n[vlen] == '\t')
n[vlen] = '\0';
else
break;
}
/* Strip whitespace from start of value */
for (; *v; v++) {
if (*v != ' ' && *v != '\t')
break;
}
/* Strip whitespace from end of value */
for (vlen = strlen(v); vlen; vlen--) {
if (v[vlen] == ' ' || v[vlen] == '\t')
v[vlen] = '\0';
else
break;
}
if (!c->comment && strcasecmp(n, "Comment") == 0) {
c->comment = strdup(v);
if (!c->comment)
return false;
} else if (!c->domain && strcasecmp(n, "Domain") == 0) {
if (v[0] == '.') {
/* Domain must start with a dot */
c->domain_from_set = true;
c->domain = strdup(v);
if (!c->domain)
return false;
}
} else if (strcasecmp(n, "Max-Age") == 0) {
int temp = atoi(v);
if (temp == 0)
/* Special case - 0 means delete */
c->expires = 0;
else
c->expires = time(NULL) + temp;
} else if (!c->path && strcasecmp(n, "Path") == 0) {
c->path_from_set = true;
c->path = strdup(v);
if (!c->path)
return false;
} else if (strcasecmp(n, "Version") == 0) {
c->version = atoi(v);
} else if (strcasecmp(n, "Expires") == 0) {
char *datenoday;
time_t expires;
/* Strip dayname from date (these are hugely
* variable and liable to break the parser.
* They also serve no useful purpose) */
for (datenoday = v; *datenoday && !isdigit(*datenoday);
datenoday++)
; /* do nothing */
expires = curl_getdate(datenoday, NULL);
if (expires == -1) {
/* assume we have an unrepresentable
* date => force it to the maximum
* possible value of a 32bit time_t
* (this may break in 2038. We'll
* deal with that once we come to
* it) */
expires = (time_t)0x7fffffff;
}
c->expires = expires;
} else if (strcasecmp(n, "Secure") == 0) {
c->secure = true;
} else if (strcasecmp(n, "HttpOnly") == 0) {
c->http_only = true;
} else if (!c->name) {
c->name = strdup(n);
c->value = strdup(v);
c->value_was_quoted = was_quoted;
if (!c->name || !c->value)
return false;
}
return true;
}
/**
* Free a cookie
*
* \param c The cookie to free
*/
static void urldb_free_cookie(struct cookie_internal_data *c)
{
assert(c);
free(c->comment);
free(c->domain);
free(c->path);
free(c->name);
free(c->value);
free(c);
}
/**
* Parse a cookie
*
* \param url URL being fetched
* \param cookie Pointer to cookie string (updated on exit)
* \return Pointer to cookie structure (on heap, caller frees) or NULL
*/
static struct cookie_internal_data *
urldb_parse_cookie(nsurl *url, const char **cookie)
{
struct cookie_internal_data *c;
const char *cur;
char name[1024], value[4096];
char *n = name, *v = value;
bool in_value = false;
bool had_value_data = false;
bool value_verbatim = false;
bool quoted = false;
bool was_quoted = false;
assert(url && cookie && *cookie);
c = calloc(1, sizeof(struct cookie_internal_data));
if (c == NULL)
return NULL;
c->expires = -1;
name[0] = '\0';
value[0] = '\0';
for (cur = *cookie; *cur; cur++) {
if (*cur == '\r' && *(cur + 1) == '\n') {
/* End of header */
if (quoted) {
/* Unmatched quote encountered */
/* Match Firefox 2.0.0.11 */
value[0] = '\0';
}
break;
} else if (*cur == '\r') {
/* Spurious linefeed */
continue;
} else if (*cur == '\n') {
/* Spurious newline */
continue;
}
if (in_value && !had_value_data) {
if (*cur == ' ' || *cur == '\t') {
/* Strip leading whitespace from value */
continue;
} else {
had_value_data = true;
/* Value is taken verbatim if first non-space
* character is not a " */
if (*cur != '"') {
value_verbatim = true;
}
}
}
if (in_value && !value_verbatim && (*cur == '"')) {
/* Only non-verbatim values may be quoted */
if (cur == *cookie || *(cur - 1) != '\\') {
/* Only unescaped quotes count */
was_quoted = quoted;
quoted = !quoted;
continue;
}
}
if (!quoted && !in_value && *cur == '=') {
/* First equals => attr-value separator */
in_value = true;
continue;
}
if (!quoted && (was_quoted || *cur == ';')) {
/* Semicolon or after quoted value
* => end of current avpair */
/* NUL-terminate tokens */
*n = '\0';
*v = '\0';
if (!urldb_parse_avpair(c, name, value, was_quoted)) {
/* Memory exhausted */
urldb_free_cookie(c);
return NULL;
}
/* And reset to start */
n = name;
v = value;
in_value = false;
had_value_data = false;
value_verbatim = false;
was_quoted = false;
/* Now, if the current input is anything other than a
* semicolon, we must be sure to reprocess it */
if (*cur != ';') {
cur--;
}
continue;
}
/* And now handle commas. These are a pain as they may mean
* any of the following:
*
* + End of cookie
* + Day separator in Expires avpair
* + (Invalid) comma in unquoted value
*
* Therefore, in order to handle all 3 cases (2 and 3 are
* identical, the difference being that 2 is in the spec and
* 3 isn't), we need to determine where the comma actually
* lies. We use the following heuristic:
*
* Given a comma at the current input position, find the
* immediately following semicolon (or end of input if none
* found). Then, consider the input characters between
* these two positions. If any of these characters is an
* '=', we must assume that the comma signified the end of
* the current cookie.
*
* This holds as the first avpair of any cookie must be
* NAME=VALUE, so the '=' is guaranteed to appear in the
* case where the comma marks the end of a cookie.
*
* This will fail, however, in the case where '=' appears in
* the value of the current avpair after the comma or the
* subsequent cookie does not start with NAME=VALUE. Neither
* of these is particularly likely and if they do occur, the
* website is more broken than we can be bothered to handle.
*/
if (!quoted && *cur == ',') {
/* Find semi-colon, if any */
const char *p;
const char *semi = strchr(cur + 1, ';');
if (!semi)
semi = cur + strlen(cur) - 2 /* CRLF */;
/* Look for equals sign between comma and semi */
for (p = cur + 1; p < semi; p++)
if (*p == '=')
break;
if (p == semi) {
/* none found => comma internal to value */
/* do nothing */
} else {
/* found one => comma marks end of cookie */
cur++;
break;
}
}
/* Accumulate into buffers, always leaving space for a NUL */
/** \todo is silently truncating overlong names/values wise? */
if (!in_value) {
if (n < name + (sizeof(name) - 1))
*n++ = *cur;
} else {
if (v < value + (sizeof(value) - 1))
*v++ = *cur;
}
}
/* Parse final avpair */
*n = '\0';
*v = '\0';
if (!urldb_parse_avpair(c, name, value, was_quoted)) {
/* Memory exhausted */
urldb_free_cookie(c);
return NULL;
}
/* Now fix-up default values */
if (c->domain == NULL) {
lwc_string *host = nsurl_get_component(url, NSURL_HOST);
if (host == NULL) {
urldb_free_cookie(c);
return NULL;
}
c->domain = strdup(lwc_string_data(host));
lwc_string_unref(host);
}
if (c->path == NULL) {
const char *path_data;
char *path, *slash;
lwc_string *path_lwc;
path_lwc = nsurl_get_component(url, NSURL_PATH);
if (path_lwc == NULL) {
urldb_free_cookie(c);
return NULL;
}
path_data = lwc_string_data(path_lwc);
/* Strip leafname and trailing slash (4.3.1) */
slash = strrchr(path_data, '/');
if (slash != NULL) {
/* Special case: retain first slash in path */
if (slash == path_data)
slash++;
slash = strndup(path_data, slash - path_data);
if (slash == NULL) {
lwc_string_unref(path_lwc);
urldb_free_cookie(c);
return NULL;
}
path = slash;
lwc_string_unref(path_lwc);
} else {
path = strdup(lwc_string_data(path_lwc));
lwc_string_unref(path_lwc);
if (path == NULL) {
urldb_free_cookie(c);
return NULL;
}
}
c->path = path;
}
/* Write back current position */
*cookie = cur;
return c;
}
/**
* Insert a cookie into the database
*
* \param c The cookie to insert
* \param scheme URL scheme associated with cookie path
* \param url URL (sans fragment) associated with cookie
* \return true on success, false on memory exhaustion (c will be freed)
*/
static bool urldb_insert_cookie(struct cookie_internal_data *c,
lwc_string *scheme, nsurl *url)
{
struct cookie_internal_data *d;
const struct host_part *h;
struct path_data *p;
time_t now = time(NULL);
assert(c);
if (c->domain[0] == '.') {
h = urldb_search_find(
urldb_get_search_tree(&(c->domain[1])),
c->domain + 1);
if (!h) {
h = urldb_add_host(c->domain + 1);
if (!h) {
urldb_free_cookie(c);
return false;
}
}
p = (struct path_data *) &h->paths;
} else {
/* Need to have a URL and scheme, if it's not a domain cookie */
assert(url != NULL);
assert(scheme != NULL);
h = urldb_search_find(
urldb_get_search_tree(c->domain),
c->domain);
if (!h) {
h = urldb_add_host(c->domain);
if (!h) {
urldb_free_cookie(c);
return false;
}
}
/* find path */
p = urldb_add_path(scheme, 0, h,
strdup(c->path), NULL, url);
if (!p) {
urldb_free_cookie(c);
return false;
}
}
/* add cookie */
for (d = p->cookies; d; d = d->next) {
if (!strcmp(d->domain, c->domain) &&
!strcmp(d->path, c->path) &&
!strcmp(d->name, c->name))
break;
}
if (d) {
if (c->expires != -1 && c->expires < now) {
/* remove cookie */
if (d->next)
d->next->prev = d->prev;
else
p->cookies_end = d->prev;
if (d->prev)
d->prev->next = d->next;
else
p->cookies = d->next;
cookie_manager_remove((struct cookie_data *)d);
urldb_free_cookie(d);
urldb_free_cookie(c);
} else {
/* replace d with c */
c->prev = d->prev;
c->next = d->next;
if (c->next)
c->next->prev = c;
else
p->cookies_end = c;
if (c->prev)
c->prev->next = c;
else
p->cookies = c;
cookie_manager_remove((struct cookie_data *)d);
urldb_free_cookie(d);
cookie_manager_add((struct cookie_data *)c);
}
} else {
c->prev = p->cookies_end;
c->next = NULL;
if (p->cookies_end)
p->cookies_end->next = c;
else
p->cookies = c;
p->cookies_end = c;
cookie_manager_add((struct cookie_data *)c);
}
return true;
}
/**
* Concatenate a cookie into the provided buffer
*
* \param c Cookie to concatenate
* \param version The version of the cookie string to output
* \param used Pointer to amount of buffer used (updated)
* \param alloc Pointer to allocated size of buffer (updated)
* \param buf Pointer to Pointer to buffer (updated)
* \return true on success, false on memory exhaustion
*/
static bool urldb_concat_cookie(struct cookie_internal_data *c, int version,
int *used, int *alloc, char **buf)
{
/* Combined (A)BNF for the Cookie: request header:
*
* CHAR = <any US-ASCII character (octets 0 - 127)>
* CTL = <any US-ASCII control character
* (octets 0 - 31) and DEL (127)>
* CR = <US-ASCII CR, carriage return (13)>
* LF = <US-ASCII LF, linefeed (10)>
* SP = <US-ASCII SP, space (32)>
* HT = <US-ASCII HT, horizontal-tab (9)>
* <"> = <US-ASCII double-quote mark (34)>
*
* CRLF = CR LF
*
* LWS = [CRLF] 1*( SP | HT )
*
* TEXT = <any OCTET except CTLs,
* but including LWS>
*
* token = 1*<any CHAR except CTLs or separators>
* separators = "(" | ")" | "<" | ">" | "@"
* | "," | ";" | ":" | "\" | <">
* | "/" | "[" | "]" | "?" | "="
* | "{" | "}" | SP | HT
*
* quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
* qdtext = <any TEXT except <">>
* quoted-pair = "\" CHAR
*
* attr = token
* value = word
* word = token | quoted-string
*
* cookie = "Cookie:" cookie-version
* 1*((";" | ",") cookie-value)
* cookie-value = NAME "=" VALUE [";" path] [";" domain]
* cookie-version = "$Version" "=" value
* NAME = attr
* VALUE = value
* path = "$Path" "=" value
* domain = "$Domain" "=" value
*
* A note on quoted-string handling:
* The cookie data stored in the db is verbatim (i.e. sans enclosing
* <">, if any, and with all quoted-pairs intact) thus all that we
* need to do here is ensure that value strings which were quoted
* in Set-Cookie or which include any of the separators are quoted
* before use.
*
* A note on cookie-value separation:
* We use semicolons for all separators, including between
* cookie-values. This simplifies things and is backwards compatible.
*/
const char * const separators = "()<>@,;:\\\"/[]?={} \t";
int max_len;
assert(c && used && alloc && buf && *buf);
/* "; " cookie-value
* We allow for the possibility that values are quoted
*/
max_len = 2 + strlen(c->name) + 1 + strlen(c->value) + 2 +
(c->path_from_set ?
8 + strlen(c->path) + 2 : 0) +
(c->domain_from_set ?
10 + strlen(c->domain) + 2 : 0);
if (*used + max_len >= *alloc) {
char *temp = realloc(*buf, *alloc + 4096);
if (!temp) {
return false;
}
*buf = temp;
*alloc += 4096;
}
if (version == COOKIE_NETSCAPE) {
/* Original Netscape cookie */
sprintf(*buf + *used - 1, "; %s=", c->name);
*used += 2 + strlen(c->name) + 1;
/* The Netscape spec doesn't mention quoting of cookie values.
* RFC 2109 $10.1.3 indicates that values must not be quoted.
*
* However, other browsers preserve quoting, so we should, too
*/
if (c->value_was_quoted) {
sprintf(*buf + *used - 1, "\"%s\"", c->value);
*used += 1 + strlen(c->value) + 1;
} else {
/** \todo should we %XX-encode [;HT,SP] ? */
/** \todo Should we strip escaping backslashes? */
sprintf(*buf + *used - 1, "%s", c->value);
*used += strlen(c->value);
}
/* We don't send path/domain information -- that's what the
* Netscape spec suggests we should do, anyway. */
} else {
/* RFC2109 or RFC2965 cookie */
sprintf(*buf + *used - 1, "; %s=", c->name);
*used += 2 + strlen(c->name) + 1;
/* Value needs quoting if it contains any separator or if
* it needs preserving from the Set-Cookie header */
if (c->value_was_quoted ||
strpbrk(c->value, separators) != NULL) {
sprintf(*buf + *used - 1, "\"%s\"", c->value);
*used += 1 + strlen(c->value) + 1;
} else {
sprintf(*buf + *used - 1, "%s", c->value);
*used += strlen(c->value);
}
if (c->path_from_set) {
/* Path, quoted if necessary */
sprintf(*buf + *used - 1, "; $Path=");
*used += 8;
if (strpbrk(c->path, separators) != NULL) {
sprintf(*buf + *used - 1, "\"%s\"", c->path);
*used += 1 + strlen(c->path) + 1;
} else {
sprintf(*buf + *used - 1, "%s", c->path);
*used += strlen(c->path);
}
}
if (c->domain_from_set) {
/* Domain, quoted if necessary */
sprintf(*buf + *used - 1, "; $Domain=");
*used += 10;
if (strpbrk(c->domain, separators) != NULL) {
sprintf(*buf + *used - 1, "\"%s\"", c->domain);
*used += 1 + strlen(c->domain) + 1;
} else {
sprintf(*buf + *used - 1, "%s", c->domain);
*used += strlen(c->domain);
}
}
}
return true;
}
/**
* deletes paths from a cookie.
*/
static void urldb_delete_cookie_paths(const char *domain, const char *path,
const char *name, struct path_data *parent)
{
struct cookie_internal_data *c;
struct path_data *p = parent;
assert(parent);
do {
for (c = p->cookies; c; c = c->next) {
if (strcmp(c->domain, domain) == 0 &&
strcmp(c->path, path) == 0 &&
strcmp(c->name, name) == 0) {
if (c->prev)
c->prev->next = c->next;
else
p->cookies = c->next;
if (c->next)
c->next->prev = c->prev;
else
p->cookies_end = c->prev;
urldb_free_cookie(c);
return;
}
}
if (p->children) {
p = p->children;
} else {
while (p != parent) {
if (p->next != NULL) {
p = p->next;
break;
}
p = p->parent;
}
}
} while (p != parent);
}
/**
* Deletes cookie hosts and their assoicated paths
*/
static void urldb_delete_cookie_hosts(const char *domain, const char *path,
const char *name, struct host_part *parent)
{
struct host_part *h;
assert(parent);
urldb_delete_cookie_paths(domain, path, name, &parent->paths);
for (h = parent->children; h; h = h->next)
urldb_delete_cookie_hosts(domain, path, name, h);
}
/**
* Save a path subtree's cookies
*
* \param fp File pointer to write to
* \param parent Parent path
*/
static void urldb_save_cookie_paths(FILE *fp, struct path_data *parent)
{
struct path_data *p = parent;
time_t now = time(NULL);
assert(fp && parent);
do {
if (p->cookies != NULL) {
struct cookie_internal_data *c;
for (c = p->cookies; c != NULL; c = c->next) {
if (c->expires == -1 || c->expires < now)
/* Skip expired & session cookies */
continue;
fprintf(fp,
"%d\t%s\t%d\t%s\t%d\t%d\t%d\t%d\t%d\t%d\t"
"%s\t%s\t%d\t%s\t%s\t%s\n",
c->version, c->domain,
c->domain_from_set, c->path,
c->path_from_set, c->secure,
c->http_only,
(int)c->expires, (int)c->last_used,
c->no_destroy, c->name, c->value,
c->value_was_quoted,
p->scheme ? lwc_string_data(p->scheme) :
"unused",
p->url ? nsurl_access(p->url) :
"unused",
c->comment ? c->comment : "");
}
}
if (p->children != NULL) {
p = p->children;
} else {
while (p != parent) {
if (p->next != NULL) {
p = p->next;
break;
}
p = p->parent;
}
}
} while (p != parent);
}
/**
* Save a host subtree's cookies
*
* \param fp File pointer to write to
* \param parent Parent host
*/
static void urldb_save_cookie_hosts(FILE *fp, struct host_part *parent)
{
struct host_part *h;
assert(fp && parent);
urldb_save_cookie_paths(fp, &parent->paths);
for (h = parent->children; h; h = h->next)
urldb_save_cookie_hosts(fp, h);
}
/**
* Destroy a cookie node
*
* \param c Cookie to destroy
*/
static void urldb_destroy_cookie(struct cookie_internal_data *c)
{
free(c->name);
free(c->value);
free(c->comment);
free(c->domain);
free(c->path);
free(c);
}
/**
* Destroy the contents of a path node
*
* \param node Node to destroy contents of (does not destroy node)
*/
static void urldb_destroy_path_node_content(struct path_data *node)
{
struct cookie_internal_data *a, *b;
unsigned int i;
if (node->url != NULL)
nsurl_unref(node->url);
if (node->scheme != NULL)
lwc_string_unref(node->scheme);
free(node->segment);
for (i = 0; i < node->frag_cnt; i++)
free(node->fragment[i]);
free(node->fragment);
if (node->thumb) {
guit->bitmap->destroy(node->thumb);
}
free(node->urld.title);
for (a = node->cookies; a; a = b) {
b = a->next;
urldb_destroy_cookie(a);
}
}
/**
* Destroy protection space data
*
* \param space Protection space to destroy
*/
static void urldb_destroy_prot_space(struct prot_space_data *space)
{
lwc_string_unref(space->scheme);
free(space->realm);
free(space->auth);
free(space);
}
/**
* Destroy a path tree
*
* \param root Root node of tree to destroy
*/
static void urldb_destroy_path_tree(struct path_data *root)
{
struct path_data *p = root;
do {
if (p->children != NULL) {
p = p->children;
} else {
struct path_data *q = p;
while (p != root) {
if (p->next != NULL) {
p = p->next;
break;
}
p = p->parent;
urldb_destroy_path_node_content(q);
free(q);
q = p;
}
urldb_destroy_path_node_content(q);
free(q);
}
} while (p != root);
}
/**
* Destroy a host tree
*
* \param root Root node of tree to destroy
*/
static void urldb_destroy_host_tree(struct host_part *root)
{
struct host_part *a, *b;
struct path_data *p, *q;
struct prot_space_data *s, *t;
/* Destroy children */
for (a = root->children; a; a = b) {
b = a->next;
urldb_destroy_host_tree(a);
}
/* Now clean up paths */
for (p = root->paths.children; p; p = q) {
q = p->next;
urldb_destroy_path_tree(p);
}
/* Root path */
urldb_destroy_path_node_content(&root->paths);
/* Proctection space data */
for (s = root->prot_space; s; s = t) {
t = s->next;
urldb_destroy_prot_space(s);
}
/* And ourselves */
free(root->part);
free(root);
}
/**
* Destroy a search tree
*
* \param root Root node of tree to destroy
*/
static void urldb_destroy_search_tree(struct search_node *root)
{
/* Destroy children */
if (root->left != &empty)
urldb_destroy_search_tree(root->left);
if (root->right != &empty)
urldb_destroy_search_tree(root->right);
/* And destroy ourselves */
free(root);
}
/*************** External interface ***************/
/* exported interface documented in content/urldb.h */
void urldb_destroy(void)
{
struct host_part *a, *b;
int i;
/* Clean up search trees */
for (i = 0; i < NUM_SEARCH_TREES; i++) {
if (search_trees[i] != &empty)
urldb_destroy_search_tree(search_trees[i]);
}
/* And database */
for (a = db_root.children; a; a = b) {
b = a->next;
urldb_destroy_host_tree(a);
}
/* And the bloom filter */
if (url_bloom != NULL)
bloom_destroy(url_bloom);
}
/* exported interface documented in content/urldb.h */
nserror urldb_load(const char *filename)
{
#define MAXIMUM_URL_LENGTH 4096
char s[MAXIMUM_URL_LENGTH];
char host[256];
struct host_part *h;
int urls;
int i;
int version;
int length;
FILE *fp;
assert(filename);
LOG(("Loading URL file %s", filename));
if (url_bloom == NULL)
url_bloom = bloom_create(BLOOM_SIZE);
fp = fopen(filename, "r");
if (!fp) {
LOG(("Failed to open file '%s' for reading", filename));
return NSERROR_NOT_FOUND;
}
if (!fgets(s, MAXIMUM_URL_LENGTH, fp)) {
fclose(fp);
return NSERROR_NEED_DATA;
}
version = atoi(s);
if (version < MIN_URL_FILE_VERSION) {
LOG(("Unsupported URL file version."));
fclose(fp);
return NSERROR_INVALID;
}
if (version > URL_FILE_VERSION) {
LOG(("Unknown URL file version."));
fclose(fp);
return NSERROR_INVALID;
}
while (fgets(host, sizeof host, fp)) {
/* get the hostname */
length = strlen(host) - 1;
host[length] = '\0';
/* skip data that has ended up with a host of '' */
if (length == 0) {
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
urls = atoi(s);
/* Eight fields/url */
for (i = 0; i < (8 * urls); i++) {
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
}
continue;
}
/* read number of URLs */
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
urls = atoi(s);
/* no URLs => try next host */
if (urls == 0) {
LOG(("No URLs for '%s'", host));
continue;
}
h = urldb_add_host(host);
if (!h) {
LOG(("Failed adding host: '%s'", host));
fclose(fp);
return NSERROR_NOMEM;
}
/* load the non-corrupt data */
for (i = 0; i < urls; i++) {
struct path_data *p = NULL;
char scheme[64], ports[10];
char url[64 + 3 + 256 + 6 + 4096 + 1];
unsigned int port;
bool is_file = false;
nsurl *nsurl;
lwc_string *scheme_lwc, *fragment_lwc;
char *path_query;
size_t len;
if (!fgets(scheme, sizeof scheme, fp))
break;
length = strlen(scheme) - 1;
scheme[length] = '\0';
if (!fgets(ports, sizeof ports, fp))
break;
length = strlen(ports) - 1;
ports[length] = '\0';
port = atoi(ports);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
length = strlen(s) - 1;
s[length] = '\0';
if (!strcasecmp(host, "localhost") &&
!strcasecmp(scheme, "file"))
is_file = true;
snprintf(url, sizeof url, "%s://%s%s%s%s",
scheme,
/* file URLs have no host */
(is_file ? "" : host),
(port ? ":" : ""),
(port ? ports : ""),
s);
/* TODO: store URLs in pre-parsed state, and make
* a nsurl_load to generate the nsurl more
* swiftly.
* Need a nsurl_save too.
*/
if (nsurl_create(url, &nsurl) != NSERROR_OK) {
LOG(("Failed inserting '%s'", url));
fclose(fp);
return NSERROR_NOMEM;
}
if (url_bloom != NULL) {
uint32_t hash = nsurl_hash(nsurl);
bloom_insert_hash(url_bloom, hash);
}
/* Copy and merge path/query strings */
if (nsurl_get(nsurl, NSURL_PATH | NSURL_QUERY,
&path_query, &len) != NSERROR_OK) {
LOG(("Failed inserting '%s'", url));
fclose(fp);
return NSERROR_NOMEM;
}
scheme_lwc = nsurl_get_component(nsurl, NSURL_SCHEME);
fragment_lwc = nsurl_get_component(nsurl,
NSURL_FRAGMENT);
p = urldb_add_path(scheme_lwc, port, h, path_query,
fragment_lwc, nsurl);
if (!p) {
LOG(("Failed inserting '%s'", url));
fclose(fp);
return NSERROR_NOMEM;
}
nsurl_unref(nsurl);
lwc_string_unref(scheme_lwc);
if (fragment_lwc != NULL)
lwc_string_unref(fragment_lwc);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
if (p)
p->urld.visits = (unsigned int)atoi(s);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
if (p)
p->urld.last_visit = (time_t)atoi(s);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
if (p)
p->urld.type = (content_type)atoi(s);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
length = strlen(s) - 1;
if (p && length > 0) {
s[length] = '\0';
p->urld.title = malloc(length + 1);
if (p->urld.title)
memcpy(p->urld.title, s, length + 1);
}
}
}
fclose(fp);
LOG(("Successfully loaded URL file"));
#undef MAXIMUM_URL_LENGTH
return NSERROR_OK;
}
/* exported interface documented in content/urldb.h */
nserror urldb_save(const char *filename)
{
FILE *fp;
int i;
assert(filename);
fp = fopen(filename, "w");
if (!fp) {
LOG(("Failed to open file '%s' for writing", filename));
return NSERROR_SAVE_FAILED;
}
/* file format version number */
fprintf(fp, "%d\n", URL_FILE_VERSION);
for (i = 0; i != NUM_SEARCH_TREES; i++) {
urldb_save_search_tree(search_trees[i], fp);
}
fclose(fp);
return NSERROR_OK;
}
/* exported interface documented in content/urldb.h */
void urldb_set_url_persistence(nsurl *url, bool persist)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return;
p->persistent = persist;
}
/* exported interface documented in content/urldb.h */
bool urldb_add_url(nsurl *url)
{
struct host_part *h;
struct path_data *p;
lwc_string *scheme;
lwc_string *port;
lwc_string *host;
lwc_string *fragment;
const char *host_str;
char *path_query = NULL;
size_t len;
bool match;
unsigned int port_int;
assert(url);
if (url_bloom == NULL)
url_bloom = bloom_create(BLOOM_SIZE);
if (url_bloom != NULL) {
uint32_t hash = nsurl_hash(url);
bloom_insert_hash(url_bloom, hash);
}
/* Copy and merge path/query strings */
if (nsurl_get(url, NSURL_PATH | NSURL_QUERY, &path_query, &len) !=
NSERROR_OK) {
return false;
}
assert(path_query != NULL);
scheme = nsurl_get_component(url, NSURL_SCHEME);
if (scheme == NULL) {
free(path_query);
return false;
}
host = nsurl_get_component(url, NSURL_HOST);
if (host != NULL) {
host_str = lwc_string_data(host);
lwc_string_unref(host);
} else if (lwc_string_isequal(scheme, corestring_lwc_file, &match) ==
lwc_error_ok && match == true) {
host_str = "localhost";
} else {
lwc_string_unref(scheme);
free(path_query);
return false;
}
fragment = nsurl_get_component(url, NSURL_FRAGMENT);
port = nsurl_get_component(url, NSURL_PORT);
if (port != NULL) {
port_int = atoi(lwc_string_data(port));
lwc_string_unref(port);
} else {
port_int = 0;
}
/* Get host entry */
h = urldb_add_host(host_str);
/* Get path entry */
p = (h != NULL) ? urldb_add_path(scheme, port_int, h, path_query,
fragment, url) : NULL;
lwc_string_unref(scheme);
if (fragment != NULL)
lwc_string_unref(fragment);
return (p != NULL);
}
/* exported interface documented in content/urldb.h */
void urldb_set_url_title(nsurl *url, const char *title)
{
struct path_data *p;
char *temp;
assert(url && title);
p = urldb_find_url(url);
if (!p)
return;
temp = strdup(title);
if (!temp)
return;
free(p->urld.title);
p->urld.title = temp;
}
/* exported interface documented in content/urldb.h */
void urldb_set_url_content_type(nsurl *url, content_type type)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return;
p->urld.type = type;
}
/* exported interface documented in content/urldb.h */
void urldb_update_url_visit_data(nsurl *url)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return;
p->urld.last_visit = time(NULL);
p->urld.visits++;
}
/* exported interface documented in content/urldb.h */
void urldb_reset_url_visit_data(nsurl *url)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return;
p->urld.last_visit = (time_t)0;
p->urld.visits = 0;
}
/* exported interface documented in content/urldb.h */
const struct url_data *urldb_get_url_data(nsurl *url)
{
struct path_data *p;
struct url_internal_data *u;
assert(url);
p = urldb_find_url(url);
if (!p)
return NULL;
u = &p->urld;
return (const struct url_data *) u;
}
/* exported interface documented in content/urldb.h */
nsurl *urldb_get_url(nsurl *url)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return NULL;
return p->url;
}
/* exported interface documented in content/urldb.h */
void urldb_set_auth_details(nsurl *url, const char *realm, const char *auth)
{
struct path_data *p, *pi;
struct host_part *h;
struct prot_space_data *space, *space_alloc;
char *realm_alloc, *auth_alloc;
bool match;
assert(url && realm && auth);
/* add url, in case it's missing */
urldb_add_url(url);
p = urldb_find_url(url);
if (!p)
return;
/* Search for host_part */
for (pi = p; pi->parent != NULL; pi = pi->parent)
;
h = (struct host_part *)pi;
/* Search if given URL belongs to a protection space we already know of. */
for (space = h->prot_space; space; space = space->next) {
if (!strcmp(space->realm, realm) &&
lwc_string_isequal(space->scheme, p->scheme,
&match) == lwc_error_ok &&
match == true &&
space->port == p->port)
break;
}
if (space != NULL) {
/* Overrule existing auth. */
free(space->auth);
space->auth = strdup(auth);
} else {
/* Create a new protection space. */
space = space_alloc = malloc(sizeof(struct prot_space_data));
realm_alloc = strdup(realm);
auth_alloc = strdup(auth);
if (!space_alloc || !realm_alloc || !auth_alloc) {
free(space_alloc);
free(realm_alloc);
free(auth_alloc);
return;
}
space->scheme = lwc_string_ref(p->scheme);
space->port = p->port;
space->realm = realm_alloc;
space->auth = auth_alloc;
space->next = h->prot_space;
h->prot_space = space;
}
p->prot_space = space;
}
/* exported interface documented in content/urldb.h */
const char *urldb_get_auth_details(nsurl *url, const char *realm)
{
struct path_data *p, *p_cur, *p_top;
assert(url);
/* add to the db, so our lookup will work */
urldb_add_url(url);
p = urldb_find_url(url);
if (!p)
return NULL;
/* Check for any auth details attached to the path_data node or any of
* its parents.
*/
for (p_cur = p; p_cur != NULL; p_top = p_cur, p_cur = p_cur->parent) {
if (p_cur->prot_space) {
return p_cur->prot_space->auth;
}
}
/* Only when we have a realm (and canonical root of given URL), we can
* uniquely locate the protection space.
*/
if (realm != NULL) {
const struct host_part *h = (const struct host_part *)p_top;
const struct prot_space_data *space;
bool match;
/* Search for a possible matching protection space. */
for (space = h->prot_space; space != NULL;
space = space->next) {
if (!strcmp(space->realm, realm) &&
lwc_string_isequal(space->scheme,
p->scheme, &match) ==
lwc_error_ok &&
match == true &&
space->port == p->port) {
p->prot_space = space;
return p->prot_space->auth;
}
}
}
return NULL;
}
/* exported interface documented in content/urldb.h */
void urldb_set_cert_permissions(nsurl *url, bool permit)
{
struct path_data *p;
struct host_part *h;
assert(url);
/* add url, in case it's missing */
urldb_add_url(url);
p = urldb_find_url(url);
if (!p)
return;
for (; p && p->parent; p = p->parent)
/* do nothing */;
assert(p);
h = (struct host_part *)p;
h->permit_invalid_certs = permit;
}
/* exported interface documented in content/urldb.h */
bool urldb_get_cert_permissions(nsurl *url)
{
struct path_data *p;
const struct host_part *h;
assert(url);
p = urldb_find_url(url);
if (!p)
return false;
for (; p && p->parent; p = p->parent)
/* do nothing */;
assert(p);
h = (const struct host_part *)p;
return h->permit_invalid_certs;
}
/* exported interface documented in content/urldb.h */
void urldb_set_thumbnail(nsurl *url, struct bitmap *bitmap)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (p != NULL) {
LOG(("Setting bitmap on %s", nsurl_access(url)));
if (p->thumb && p->thumb != bitmap) {
guit->bitmap->destroy(p->thumb);
}
p->thumb = bitmap;
}
}
/* exported interface documented in content/urldb.h */
struct bitmap *urldb_get_thumbnail(nsurl *url)
{
struct path_data *p;
assert(url);
p = urldb_find_url(url);
if (!p)
return NULL;
return p->thumb;
}
/* exported interface documented in content/urldb.h */
void urldb_iterate_partial(const char *prefix,
bool (*callback)(nsurl *url,
const struct url_data *data))
{
char host[256];
char buf[260]; /* max domain + "www." */
const char *slash, *scheme_sep;
struct search_node *tree;
const struct host_part *h;
assert(prefix && callback);
/* strip scheme */
scheme_sep = strstr(prefix, "://");
if (scheme_sep)
prefix = scheme_sep + 3;
slash = strchr(prefix, '/');
tree = urldb_get_search_tree(prefix);
if (slash) {
/* if there's a slash in the input, then we can
* assume that we're looking for a path */
snprintf(host, sizeof host, "%.*s",
(int) (slash - prefix), prefix);
h = urldb_search_find(tree, host);
if (!h) {
int len = slash - prefix;
if (len <= 3 || strncasecmp(host, "www.", 4) != 0) {
snprintf(buf, sizeof buf, "www.%s", host);
h = urldb_search_find(
search_trees[ST_DN + 'w' - 'a'],
buf);
if (!h)
return;
} else
return;
}
if (h->paths.children) {
/* Have paths, iterate them */
urldb_iterate_partial_path(&h->paths, slash + 1,
callback);
}
} else {
int len = strlen(prefix);
/* looking for hosts */
if (!urldb_iterate_partial_host(tree, prefix, callback))
return;
if (len <= 3 || strncasecmp(prefix, "www.", 4) != 0) {
/* now look for www.prefix */
snprintf(buf, sizeof buf, "www.%s", prefix);
if(!urldb_iterate_partial_host(
search_trees[ST_DN + 'w' - 'a'],
buf, callback))
return;
}
}
}
/* exported interface documented in content/urldb.h */
void urldb_iterate_entries(bool (*callback)(nsurl *url,
const struct url_data *data))
{
int i;
assert(callback);
for (i = 0; i < NUM_SEARCH_TREES; i++) {
if (!urldb_iterate_entries_host(search_trees[i],
callback, NULL))
break;
}
}
/* exported interface documented in content/urldb.h */
void urldb_iterate_cookies(bool (*callback)(const struct cookie_data *data))
{
int i;
assert(callback);
for (i = 0; i < NUM_SEARCH_TREES; i++) {
if (!urldb_iterate_entries_host(search_trees[i],
NULL, callback))
break;
}
}
/* exported interface documented in content/urldb.h */
bool urldb_set_cookie(const char *header, nsurl *url, nsurl *referer)
{
const char *cur = header, *end;
lwc_string *path, *host, *scheme;
nsurl *urlt;
bool match;
assert(url && header);
/* Get defragmented URL, as 'urlt' */
if (nsurl_defragment(url, &urlt) != NSERROR_OK)
return NULL;
scheme = nsurl_get_component(url, NSURL_SCHEME);
if (scheme == NULL) {
nsurl_unref(urlt);
return false;
}
path = nsurl_get_component(url, NSURL_PATH);
if (path == NULL) {
lwc_string_unref(scheme);
nsurl_unref(urlt);
return false;
}
host = nsurl_get_component(url, NSURL_HOST);
if (host == NULL) {
lwc_string_unref(path);
lwc_string_unref(scheme);
nsurl_unref(urlt);
return false;
}
if (referer) {
lwc_string *rhost;
/* Ensure that url's host name domain matches
* referer's (4.3.5) */
rhost = nsurl_get_component(referer, NSURL_HOST);
if (rhost == NULL) {
goto error;
}
/* Domain match host names */
if (lwc_string_isequal(host, rhost, &match) == lwc_error_ok &&
match == false) {
const char *hptr;
const char *rptr;
const char *dot;
const char *host_data = lwc_string_data(host);
const char *rhost_data = lwc_string_data(rhost);
/* Ensure neither host nor rhost are IP addresses */
if (urldb__host_is_ip_address(host_data) ||
urldb__host_is_ip_address(rhost_data)) {
/* IP address, so no partial match */
lwc_string_unref(rhost);
goto error;
}
/* Not exact match, so try the following:
*
* 1) Find the longest common suffix of host and rhost
* (may be all of host/rhost)
* 2) Discard characters from the start of the suffix
* until the suffix starts with a dot
* (prevents foobar.com matching bar.com)
* 3) Ensure the suffix is non-empty and contains
* embedded dots (to avoid permitting .com as a
* suffix)
*
* Note that the above in no way resembles the
* domain matching algorithm found in RFC2109.
* It does, however, model the real world rather
* more accurately.
*/
/** \todo In future, we should consult a TLD service
* instead of just looking for embedded dots.
*/
hptr = host_data + lwc_string_length(host) - 1;
rptr = rhost_data + lwc_string_length(rhost) - 1;
/* 1 */
while (hptr >= host_data && rptr >= rhost_data) {
if (*hptr != *rptr)
break;
hptr--;
rptr--;
}
/* Ensure we end up pointing at the start of the
* common suffix. The above loop will exit pointing
* to the byte before the start of the suffix. */
hptr++;
/* 2 */
while (*hptr != '\0' && *hptr != '.')
hptr++;
/* 3 */
if (*hptr == '\0' ||
(dot = strchr(hptr + 1, '.')) == NULL ||
*(dot + 1) == '\0') {
lwc_string_unref(rhost);
goto error;
}
}
lwc_string_unref(rhost);
}
end = cur + strlen(cur) - 2 /* Trailing CRLF */;
do {
struct cookie_internal_data *c;
char *dot;
size_t len;
c = urldb_parse_cookie(url, &cur);
if (!c) {
/* failed => stop parsing */
goto error;
}
/* validate cookie */
/* 4.2.2:i Cookie must have NAME and VALUE */
if (!c->name || !c->value) {
urldb_free_cookie(c);
goto error;
}
/* 4.3.2:i Cookie path must be a prefix of URL path */
len = strlen(c->path);
if (len > lwc_string_length(path) ||
strncmp(c->path, lwc_string_data(path),
len) != 0) {
urldb_free_cookie(c);
goto error;
}
/* 4.3.2:ii Cookie domain must contain embedded dots */
dot = strchr(c->domain + 1, '.');
if (!dot || *(dot + 1) == '\0') {
/* no embedded dots */
urldb_free_cookie(c);
goto error;
}
/* Domain match fetch host with cookie domain */
if (strcasecmp(lwc_string_data(host), c->domain) != 0) {
int hlen, dlen;
char *domain = c->domain;
/* c->domain must be a domain cookie here because:
* c->domain is either:
* + specified in the header as a domain cookie
* (non-domain cookies in the header are ignored
* by urldb_parse_cookie / urldb_parse_avpair)
* + defaulted to the URL's host part
* (by urldb_parse_cookie if no valid domain was
* specified in the header)
*
* The latter will pass the strcasecmp above, which
* leaves the former (i.e. a domain cookie)
*/
assert(c->domain[0] == '.');
/* 4.3.2:iii */
if (urldb__host_is_ip_address(lwc_string_data(host))) {
/* IP address, so no partial match */
urldb_free_cookie(c);
goto error;
}
hlen = lwc_string_length(host);
dlen = strlen(c->domain);
if (hlen <= dlen && hlen != dlen - 1) {
/* Partial match not possible */
urldb_free_cookie(c);
goto error;
}
if (hlen == dlen - 1) {
/* Relax matching to allow
* host a.com to match .a.com */
domain++;
dlen--;
}
if (strcasecmp(lwc_string_data(host) + (hlen - dlen),
domain)) {
urldb_free_cookie(c);
goto error;
}
/* 4.3.2:iv Ensure H contains no dots
*
* If you believe the spec, H should contain no
* dots in _any_ cookie. Unfortunately, however,
* reality differs in that many sites send domain
* cookies of the form .foo.com from hosts such
* as bar.bat.foo.com and then expect domain
* matching to work. Thus we have to do what they
* expect, regardless of any potential security
* implications.
*
* This is what code conforming to the spec would
* look like:
*
* for (int i = 0; i < (hlen - dlen); i++) {
* if (host[i] == '.') {
* urldb_free_cookie(c);
* goto error;
* }
* }
*/
}
/* Now insert into database */
if (!urldb_insert_cookie(c, scheme, urlt))
goto error;
} while (cur < end);
lwc_string_unref(host);
lwc_string_unref(path);
lwc_string_unref(scheme);
nsurl_unref(urlt);
return true;
error:
lwc_string_unref(host);
lwc_string_unref(path);
lwc_string_unref(scheme);
nsurl_unref(urlt);
return false;
}
/* exported interface documented in content/urldb.h */
char *urldb_get_cookie(nsurl *url, bool include_http_only)
{
const struct path_data *p, *q;
const struct host_part *h;
lwc_string *path_lwc;
struct cookie_internal_data *c;
int count = 0, version = COOKIE_RFC2965;
struct cookie_internal_data **matched_cookies;
int matched_cookies_size = 20;
int ret_alloc = 4096, ret_used = 1;
const char *path;
char *ret;
lwc_string *scheme;
time_t now;
int i;
bool match;
assert(url != NULL);
/* The URL must exist in the db in order to find relevant cookies, since
* we search up the tree from the URL node, and cookies from further
* up also apply. */
urldb_add_url(url);
p = urldb_find_url(url);
if (!p)
return NULL;
scheme = p->scheme;
matched_cookies = malloc(matched_cookies_size *
sizeof(struct cookie_internal_data *));
if (!matched_cookies)
return NULL;
#define GROW_MATCHED_COOKIES \
do { \
if (count == matched_cookies_size) { \
struct cookie_internal_data **temp; \
temp = realloc(matched_cookies, \
(matched_cookies_size + 20) * \
sizeof(struct cookie_internal_data *)); \
\
if (temp == NULL) { \
free(ret); \
free(matched_cookies); \
return NULL; \
} \
\
matched_cookies = temp; \
matched_cookies_size += 20; \
} \
} while(0)
ret = malloc(ret_alloc);
if (!ret) {
free(matched_cookies);
return NULL;
}
ret[0] = '\0';
path_lwc = nsurl_get_component(url, NSURL_PATH);
if (path_lwc == NULL) {
free(ret);
free(matched_cookies);
return NULL;
}
path = lwc_string_data(path_lwc);
lwc_string_unref(path_lwc);
now = time(NULL);
if (*(p->segment) != '\0') {
/* Match exact path, unless directory, when prefix matching
* will handle this case for us. */
for (q = p->parent->children; q; q = q->next) {
if (strcmp(q->segment, p->segment))
continue;
/* Consider all cookies associated with
* this exact path */
for (c = q->cookies; c; c = c->next) {
if (c->expires != -1 && c->expires < now)
/* cookie has expired => ignore */
continue;
if (c->secure && lwc_string_isequal(
q->scheme,
corestring_lwc_https,
&match) &&
match == false)
/* secure cookie for insecure host.
* ignore */
continue;
if (c->http_only && !include_http_only)
/* Ignore HttpOnly */
continue;
matched_cookies[count++] = c;
GROW_MATCHED_COOKIES;
if (c->version < (unsigned int)version)
version = c->version;
c->last_used = now;
cookie_manager_add((struct cookie_data *)c);
}
}
}
/* Now consider cookies whose paths prefix-match ours */
for (p = p->parent; p; p = p->parent) {
/* Find directory's path entry(ies) */
/* There are potentially multiple due to differing schemes */
for (q = p->children; q; q = q->next) {
if (*(q->segment) != '\0')
continue;
for (c = q->cookies; c; c = c->next) {
if (c->expires != -1 && c->expires < now)
/* cookie has expired => ignore */
continue;
if (c->secure && lwc_string_isequal(
q->scheme,
corestring_lwc_https,
&match) &&
match == false)
/* Secure cookie for insecure server
* => ignore */
continue;
matched_cookies[count++] = c;
GROW_MATCHED_COOKIES;
if (c->version < (unsigned int) version)
version = c->version;
c->last_used = now;
cookie_manager_add((struct cookie_data *)c);
}
}
if (!p->parent) {
/* No parent, so bail here. This can't go in
* the loop exit condition as we also want to
* process the top-level node.
*
* If p->parent is NULL then p->cookies are
* the domain cookies and thus we don't even
* try matching against them.
*/
break;
}
/* Consider p itself - may be the result of Path=/foo */
for (c = p->cookies; c; c = c->next) {
if (c->expires != -1 && c->expires < now)
/* cookie has expired => ignore */
continue;
/* Ensure cookie path is a prefix of the resource */
if (strncmp(c->path, path, strlen(c->path)) != 0)
/* paths don't match => ignore */
continue;
if (c->secure && lwc_string_isequal(p->scheme,
corestring_lwc_https,
&match) &&
match == false)
/* Secure cookie for insecure server
* => ignore */
continue;
matched_cookies[count++] = c;
GROW_MATCHED_COOKIES;
if (c->version < (unsigned int) version)
version = c->version;
c->last_used = now;
cookie_manager_add((struct cookie_data *)c);
}
}
/* Finally consider domain cookies for hosts which domain match ours */
for (h = (const struct host_part *)p; h && h != &db_root;
h = h->parent) {
for (c = h->paths.cookies; c; c = c->next) {
if (c->expires != -1 && c->expires < now)
/* cookie has expired => ignore */
continue;
/* Ensure cookie path is a prefix of the resource */
if (strncmp(c->path, path, strlen(c->path)) != 0)
/* paths don't match => ignore */
continue;
if (c->secure && lwc_string_isequal(scheme,
corestring_lwc_https,
&match) &&
match == false)
/* secure cookie for insecure host. ignore */
continue;
matched_cookies[count++] = c;
GROW_MATCHED_COOKIES;
if (c->version < (unsigned int)version)
version = c->version;
c->last_used = now;
cookie_manager_add((struct cookie_data *)c);
}
}
if (count == 0) {
/* No cookies found */
free(ret);
free(matched_cookies);
return NULL;
}
/* and build output string */
if (version > COOKIE_NETSCAPE) {
sprintf(ret, "$Version=%d", version);
ret_used = strlen(ret) + 1;
}
for (i = 0; i < count; i++) {
if (!urldb_concat_cookie(matched_cookies[i], version,
&ret_used, &ret_alloc, &ret)) {
free(ret);
free(matched_cookies);
return NULL;
}
}
if (version == COOKIE_NETSCAPE) {
/* Old-style cookies => no version & skip "; " */
memmove(ret, ret + 2, ret_used - 2);
ret_used -= 2;
}
/* Now, shrink the output buffer to the required size */
{
char *temp = realloc(ret, ret_used);
if (!temp) {
free(ret);
free(matched_cookies);
return NULL;
}
ret = temp;
}
free(matched_cookies);
return ret;
#undef GROW_MATCHED_COOKIES
}
/* exported interface documented in content/urldb.h */
void urldb_delete_cookie(const char *domain, const char *path,
const char *name)
{
urldb_delete_cookie_hosts(domain, path, name, &db_root);
}
/* exported interface documented in content/urldb.h */
void urldb_load_cookies(const char *filename)
{
FILE *fp;
char s[16*1024];
assert(filename);
fp = fopen(filename, "r");
if (!fp)
return;
#define FIND_T { \
for (; *p && *p != '\t'; p++) \
; /* do nothing */ \
if (p >= end) { \
LOG(("Overran input")); \
continue; \
} \
*p++ = '\0'; \
}
#define SKIP_T { \
for (; *p && *p == '\t'; p++) \
; /* do nothing */ \
if (p >= end) { \
LOG(("Overran input")); \
continue; \
} \
}
while (fgets(s, sizeof s, fp)) {
char *p = s, *end = 0,
*domain, *path, *name, *value, *scheme, *url,
*comment;
int version, domain_specified, path_specified,
secure, http_only, no_destroy, value_quoted;
time_t expires, last_used;
struct cookie_internal_data *c;
if(s[0] == 0 || s[0] == '#')
/* Skip blank lines or comments */
continue;
s[strlen(s) - 1] = '\0'; /* lose terminating newline */
end = s + strlen(s);
/* Look for file version first
* (all input is ignored until this is read)
*/
if (strncasecmp(s, "Version:", 8) == 0) {
FIND_T; SKIP_T; loaded_cookie_file_version = atoi(p);
if (loaded_cookie_file_version <
MIN_COOKIE_FILE_VERSION) {
LOG(("Unsupported Cookie file version"));
break;
}
continue;
} else if (loaded_cookie_file_version == 0) {
/* Haven't yet seen version; skip this input */
continue;
}
/* One cookie/line */
/* Parse input */
FIND_T; version = atoi(s);
SKIP_T; domain = p; FIND_T;
SKIP_T; domain_specified = atoi(p); FIND_T;
SKIP_T; path = p; FIND_T;
SKIP_T; path_specified = atoi(p); FIND_T;
SKIP_T; secure = atoi(p); FIND_T;
if (loaded_cookie_file_version > 101) {
/* Introduced in version 1.02 */
SKIP_T; http_only = atoi(p); FIND_T;
} else {
http_only = 0;
}
SKIP_T; expires = (time_t)atoi(p); FIND_T;
SKIP_T; last_used = (time_t)atoi(p); FIND_T;
SKIP_T; no_destroy = atoi(p); FIND_T;
SKIP_T; name = p; FIND_T;
SKIP_T; value = p; FIND_T;
if (loaded_cookie_file_version > 100) {
/* Introduced in version 1.01 */
SKIP_T; value_quoted = atoi(p); FIND_T;
} else {
value_quoted = 0;
}
SKIP_T; scheme = p; FIND_T;
SKIP_T; url = p; FIND_T;
/* Comment may have no content, so don't
* use macros as they'll break */
for (; *p && *p == '\t'; p++)
; /* do nothing */
comment = p;
assert(p <= end);
/* Now create cookie */
c = malloc(sizeof(struct cookie_internal_data));
if (!c)
break;
c->name = strdup(name);
c->value = strdup(value);
c->value_was_quoted = value_quoted;
c->comment = strdup(comment);
c->domain_from_set = domain_specified;
c->domain = strdup(domain);
c->path_from_set = path_specified;
c->path = strdup(path);
c->expires = expires;
c->last_used = last_used;
c->secure = secure;
c->http_only = http_only;
c->version = version;
c->no_destroy = no_destroy;
if (!(c->name && c->value && c->comment &&
c->domain && c->path)) {
urldb_free_cookie(c);
break;
}
if (c->domain[0] != '.') {
lwc_string *scheme_lwc = NULL;
nsurl *url_nsurl = NULL;
assert(scheme[0] != 'u');
if (nsurl_create(url, &url_nsurl) != NSERROR_OK) {
urldb_free_cookie(c);
break;
}
scheme_lwc = nsurl_get_component(url_nsurl,
NSURL_SCHEME);
/* And insert it into database */
if (!urldb_insert_cookie(c, scheme_lwc, url_nsurl)) {
/* Cookie freed for us */
nsurl_unref(url_nsurl);
lwc_string_unref(scheme_lwc);
break;
}
nsurl_unref(url_nsurl);
lwc_string_unref(scheme_lwc);
} else {
if (!urldb_insert_cookie(c, NULL, NULL)) {
/* Cookie freed for us */
break;
}
}
}
#undef SKIP_T
#undef FIND_T
fclose(fp);
}
/* exported interface documented in content/urldb.h */
void urldb_save_cookies(const char *filename)
{
FILE *fp;
int cookie_file_version = max(loaded_cookie_file_version,
COOKIE_FILE_VERSION);
assert(filename);
fp = fopen(filename, "w");
if (!fp)
return;
fprintf(fp, "# >%s\n", filename);
fprintf(fp, "# NetSurf cookies file.\n"
"#\n"
"# Lines starting with a '#' are comments, "
"blank lines are ignored.\n"
"#\n"
"# All lines prior to \"Version:\t%d\" are discarded.\n"
"#\n"
"# Version\tDomain\tDomain from Set-Cookie\tPath\t"
"Path from Set-Cookie\tSecure\tHTTP-Only\tExpires\tLast used\t"
"No destroy\tName\tValue\tValue was quoted\tScheme\t"
"URL\tComment\n",
cookie_file_version);
fprintf(fp, "Version:\t%d\n", cookie_file_version);
urldb_save_cookie_hosts(fp, &db_root);
fclose(fp);
}
/* exported interface documented in content/urldb.h */
void urldb_dump(void)
{
int i;
urldb_dump_hosts(&db_root);
for (i = 0; i != NUM_SEARCH_TREES; i++)
urldb_dump_search(search_trees[i], 0);
}
/* exported interface documented in content/urldb.h */
struct host_part *urldb_add_host(const char *host)
{
struct host_part *d = (struct host_part *) &db_root, *e;
struct search_node *s;
char buf[256]; /* 256 bytes is sufficient - domain names are
* limited to 255 chars. */
char *part;
assert(host);
if (urldb__host_is_ip_address(host)) {
/* Host is an IP, so simply add as TLD */
/* Check for existing entry */
for (e = d->children; e; e = e->next)
if (strcasecmp(host, e->part) == 0)
/* found => return it */
return e;
d = urldb_add_host_node(host, d);
s = urldb_search_insert(search_trees[ST_IP], d);
if (!s) {
/* failed */
d = NULL;
} else {
search_trees[ST_IP] = s;
}
return d;
}
/* Copy host string, so we can corrupt it */
strncpy(buf, host, sizeof buf);
buf[sizeof buf - 1] = '\0';
/* Process FQDN segments backwards */
do {
part = strrchr(buf, '.');
if (!part) {
/* last segment */
/* Check for existing entry */
for (e = d->children; e; e = e->next)
if (strcasecmp(buf, e->part) == 0)
break;
if (e) {
d = e;
} else {
d = urldb_add_host_node(buf, d);
}
/* And insert into search tree */
if (d) {
struct search_node **r;
r = urldb_get_search_tree_direct(buf);
s = urldb_search_insert(*r, d);
if (!s) {
/* failed */
d = NULL;
} else {
*r = s;
}
}
break;
}
/* Check for existing entry */
for (e = d->children; e; e = e->next)
if (strcasecmp(part + 1, e->part) == 0)
break;
d = e ? e : urldb_add_host_node(part + 1, d);
if (!d)
break;
*part = '\0';
} while (1);
return d;
}
/* exported interface documented in content/urldb.h */
struct path_data *
urldb_add_path(lwc_string *scheme,
unsigned int port,
const struct host_part *host,
char *path_query,
lwc_string *fragment,
nsurl *url)
{
struct path_data *d, *e;
char *buf = path_query;
char *segment, *slash;
bool match;
assert(scheme && host && url);
d = (struct path_data *) &host->paths;
/* skip leading '/' */
segment = buf;
if (*segment == '/')
segment++;
/* Process path segments */
do {
slash = strchr(segment, '/');
if (!slash) {
/* last segment */
/* look for existing entry */
for (e = d->children; e; e = e->next)
if (strcmp(segment, e->segment) == 0 &&
lwc_string_isequal(scheme,
e->scheme, &match) ==
lwc_error_ok &&
match == true &&
e->port == port)
break;
d = e ? urldb_add_path_fragment(e, fragment) :
urldb_add_path_node(scheme, port,
segment, fragment, d);
break;
}
*slash = '\0';
/* look for existing entry */
for (e = d->children; e; e = e->next)
if (strcmp(segment, e->segment) == 0 &&
lwc_string_isequal(scheme, e->scheme,
&match) == lwc_error_ok &&
match == true &&
e->port == port)
break;
d = e ? e : urldb_add_path_node(scheme, port, segment, NULL, d);
if (!d)
break;
segment = slash + 1;
} while (1);
free(path_query);
if (d && !d->url) {
/* Insert defragmented URL */
if (nsurl_defragment(url, &d->url) != NSERROR_OK)
return NULL;
}
return d;
}
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