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#include <stdio.h>
#include <cmph.h>
#include "squarkdb.h"
#include "blob.h"
struct url_info {
blob_t protocol;
blob_t username;
blob_t password;
blob_t host;
blob_t path;
blob_t query;
blob_t fragment;
int port;
};
/* URI is generalized as:
* [proto://][user[:password]@]domain.name[:port][/[path/to][?p=a&q=b;r=c][#fragment]]
* Character literals used as separators are:
* : / @ ? & ; #
* Also URI escaping says to treat %XX as encoded hex value.
*/
static int url_parse(blob_t uri, struct url_info *nfo)
{
blob_t before_colon;
blob_t word;
memset(nfo, 0, sizeof(*nfo));
/* parse protocol, username/password and domain name/port */
do {
word = blob_pull_cspn(&uri, BLOB_STR(":@/?"));
switch (uri.len ? uri.ptr[0] : '/') {
case ':':
blob_pull_skip(&uri, 1);
if (blob_is_null(nfo->protocol) &&
blob_pull_matching(&uri, BLOB_STR("//")))
nfo->protocol = word;
else
before_colon = word;
break;
case '@':
blob_pull_skip(&uri, 1);
if (!blob_is_null(nfo->username) ||
!blob_is_null(nfo->password))
goto error;
if (!blob_is_null(before_colon)) {
nfo->username = before_colon;
nfo->password = word;
} else
nfo->username = word;
before_colon = BLOB_NULL;
break;
case '/':
case '?':
if (!blob_is_null(before_colon)) {
nfo->host = before_colon;
nfo->port = blob_pull_uint(&word, 10);
} else
nfo->host = word;
break;
}
} while (blob_is_null(nfo->host) && !blob_is_null(uri));
/* rest of the components */
nfo->path = blob_pull_cspn(&uri, BLOB_STR("?&;#"));
nfo->query = blob_pull_cspn(&uri, BLOB_STR("#"));
nfo->fragment = uri;
/* fill in defaults if needed */
if (blob_is_null(nfo->protocol)) {
if (nfo->port == 443)
nfo->protocol = BLOB_STR("https");
else
nfo->protocol = BLOB_STR("http");
if (nfo->port == 0)
nfo->port = 80;
} else if (nfo->port == 0) {
if (blob_cmp(nfo->protocol, BLOB_STR("https")) == 0)
nfo->port = 443;
else
nfo->port = 80;
}
if (blob_is_null(nfo->path))
nfo->path = BLOB_STR("/");
return 1;
error:
return 0;
}
static void url_print(struct url_info *nfo)
{
#define print_field(nfo, x) if (!blob_is_null(nfo->x)) printf(" %s{%.*s}", #x, nfo->x.len, nfo->x.ptr)
print_field(nfo, protocol);
print_field(nfo, username);
print_field(nfo, password);
print_field(nfo, host);
printf(" port{%d}", nfo->port);
print_field(nfo, path);
print_field(nfo, query);
print_field(nfo, fragment);
#undef print_field
}
static blob_t url_classify(struct url_info *url, struct sqdb *db)
{
blob_t key, got, tld;
void *cmph;
struct sqdb_index_entry *indx;
uint32_t *categories;
cmph_uint32 i = -1, previ;
cmph = sqdb_section_get(db, SQDB_SECTION_INDEX_MPH, NULL);
indx = sqdb_section_get(db, SQDB_SECTION_INDEX, NULL);
/* search for most qualified domain match; do first lookup
* with two domain components */
key = BLOB_PTR_LEN(url->host.ptr + url->host.len, 0);
tld = blob_expand_head(&key, url->host, '.');
do {
/* add one more domain component */
got = blob_expand_head(&key, url->host, '.');
if (blob_is_null(got))
break;
previ = i;
i = cmph_search_packed(cmph, key.ptr, key.len);
if (blob_cmp(got, sqdb_get_string_literal(db, indx[i].component)) != 0) {
/* the subdomain did no longer match, use
* parents classification */
i = previ;
goto parent_dns_match;
}
if (!blob_is_null(tld)) {
if (blob_cmp(tld, sqdb_get_string_literal(db, indx[indx[i].parent].component)) != 0) {
/* top level domain did not match */
i = -1;
goto parent_dns_match;
}
tld = BLOB_NULL;
}
} while (indx[i].has_subdomains);
if (key.ptr != url->host.ptr) {
/* the full of dns part did not match, so we skip the
* path name search */
goto parent_dns_match;
}
/* and then search for path matches */
parent_dns_match:
if (i == -1)
return BLOB_STR("unknown");
categories = sqdb_section_get(db, SQDB_SECTION_CATEGORIES, NULL);
printf("%d\n", indx[i].category);
return sqdb_get_string_literal(db, categories[indx[i].category]);
}
int main(int argc, char **argv)
{
const char * const uri[] = {
"http://sex.com",
"http://facebook.com:1234/",
"https://slashdot.org/path/to/me",
"http://user:pass@paistortuga.com/~mocosoft",
"user@weather.whenu.speedera.net",
"zedo1.speedera.net",
"foo.com/stuff?query;bar#frag",
"foo.com?query;bar#frag",
};
struct sqdb db;
struct url_info nfo;
blob_t cat;
int i;
sqdb_open(&db, "squark.db");
for (i = 0; i < ARRAY_SIZE(uri); i++) {
if (url_parse(BLOB_STR(uri[i]), &nfo)) {
cat = url_classify(&nfo, &db);
printf("%s - %.*s -", uri[i], cat.len, cat.ptr);
url_print(&nfo);
printf("\n");
} else {
printf("%s - BAD_URL\n", uri[i]);
}
}
sqdb_close(&db);
}
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