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/* $OpenBSD: rrdp_snapshot.c,v 1.10 2024/05/30 09:54:59 job Exp $ */
/*
* Copyright (c) 2020 Nils Fisher <nils_fisher@hotmail.com>
* Copyright (c) 2021 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <expat.h>
#include "extern.h"
#include "rrdp.h"
enum snapshot_scope {
SNAPSHOT_SCOPE_NONE,
SNAPSHOT_SCOPE_SNAPSHOT,
SNAPSHOT_SCOPE_PUBLISH,
SNAPSHOT_SCOPE_END
};
struct snapshot_xml {
XML_Parser parser;
struct rrdp_session *current;
struct rrdp *rrdp;
struct publish_xml *pxml;
char *session_id;
long long serial;
int version;
enum snapshot_scope scope;
};
static void
start_snapshot_elem(struct snapshot_xml *sxml, const char **attr)
{
XML_Parser p = sxml->parser;
int has_xmlns = 0;
int i;
if (sxml->scope != SNAPSHOT_SCOPE_NONE)
PARSE_FAIL(p,
"parse failed - entered snapshot elem unexpectedely");
for (i = 0; attr[i]; i += 2) {
const char *errstr;
if (strcmp("xmlns", attr[i]) == 0 &&
strcmp(RRDP_XMLNS, attr[i + 1]) == 0) {
has_xmlns = 1;
continue;
}
if (strcmp("version", attr[i]) == 0) {
sxml->version = strtonum(attr[i + 1],
1, MAX_VERSION, &errstr);
if (errstr == NULL)
continue;
}
if (strcmp("session_id", attr[i]) == 0 &&
valid_uuid(attr[i + 1])) {
sxml->session_id = xstrdup(attr[i + 1]);
continue;
}
if (strcmp("serial", attr[i]) == 0) {
sxml->serial = strtonum(attr[i + 1],
1, LLONG_MAX, &errstr);
if (errstr == NULL)
continue;
}
PARSE_FAIL(p,
"parse failed - non conforming "
"attribute '%s' found in snapshot elem", attr[i]);
}
if (!(has_xmlns && sxml->version && sxml->session_id && sxml->serial))
PARSE_FAIL(p,
"parse failed - incomplete snapshot attributes");
if (strcmp(sxml->current->session_id, sxml->session_id) != 0)
PARSE_FAIL(p, "parse failed - session_id mismatch");
if (sxml->current->serial != sxml->serial)
PARSE_FAIL(p, "parse failed - serial mismatch");
sxml->scope = SNAPSHOT_SCOPE_SNAPSHOT;
}
static void
end_snapshot_elem(struct snapshot_xml *sxml)
{
XML_Parser p = sxml->parser;
if (sxml->scope != SNAPSHOT_SCOPE_SNAPSHOT)
PARSE_FAIL(p, "parse failed - exited snapshot "
"elem unexpectedely");
sxml->scope = SNAPSHOT_SCOPE_END;
}
static void
start_publish_elem(struct snapshot_xml *sxml, const char **attr)
{
XML_Parser p = sxml->parser;
char *uri = NULL;
int i, hasUri = 0;
if (sxml->scope != SNAPSHOT_SCOPE_SNAPSHOT)
PARSE_FAIL(p,
"parse failed - entered publish elem unexpectedely");
for (i = 0; attr[i]; i += 2) {
if (strcmp("uri", attr[i]) == 0 && hasUri++ == 0) {
if (valid_uri(attr[i + 1], strlen(attr[i + 1]),
RSYNC_PROTO)) {
uri = xstrdup(attr[i + 1]);
continue;
}
}
/*
* XXX it seems people can not write proper XML, ignore
* bogus xmlns attribute on publish elements.
*/
if (strcmp("xmlns", attr[i]) == 0)
continue;
PARSE_FAIL(p, "parse failed - non conforming"
" attribute '%s' found in publish elem", attr[i]);
}
if (hasUri != 1)
PARSE_FAIL(p, "parse failed - incomplete publish attributes");
sxml->pxml = new_publish_xml(PUB_ADD, uri, NULL, 0);
sxml->scope = SNAPSHOT_SCOPE_PUBLISH;
}
static void
end_publish_elem(struct snapshot_xml *sxml)
{
XML_Parser p = sxml->parser;
if (sxml->scope != SNAPSHOT_SCOPE_PUBLISH)
PARSE_FAIL(p, "parse failed - exited publish "
"elem unexpectedely");
if (publish_done(sxml->rrdp, sxml->pxml) != 0)
PARSE_FAIL(p, "parse failed - bad publish elem");
sxml->pxml = NULL;
sxml->scope = SNAPSHOT_SCOPE_SNAPSHOT;
}
static void
snapshot_xml_elem_start(void *data, const char *el, const char **attr)
{
struct snapshot_xml *sxml = data;
XML_Parser p = sxml->parser;
/*
* Can only enter here once as we should have no ways to get back to
* NONE scope
*/
if (strcmp("snapshot", el) == 0)
start_snapshot_elem(sxml, attr);
/*
* Will enter here multiple times, BUT never nested. will start
* collecting character data in that handler mem is cleared in end
* block, (TODO or on parse failure)
*/
else if (strcmp("publish", el) == 0)
start_publish_elem(sxml, attr);
else
PARSE_FAIL(p, "parse failed - unexpected elem exit found");
}
static void
snapshot_xml_elem_end(void *data, const char *el)
{
struct snapshot_xml *sxml = data;
XML_Parser p = sxml->parser;
if (strcmp("snapshot", el) == 0)
end_snapshot_elem(sxml);
else if (strcmp("publish", el) == 0)
end_publish_elem(sxml);
else
PARSE_FAIL(p, "parse failed - unexpected elem exit found");
}
static void
snapshot_content_handler(void *data, const char *content, int length)
{
struct snapshot_xml *sxml = data;
XML_Parser p = sxml->parser;
if (sxml->scope == SNAPSHOT_SCOPE_PUBLISH)
if (publish_add_content(sxml->pxml, content, length) == -1)
PARSE_FAIL(p, "parse failed, snapshot element for %s "
"too big", sxml->pxml->uri);
}
static void
snapshot_doctype_handler(void *data, const char *doctypeName,
const char *sysid, const char *pubid, int subset)
{
struct snapshot_xml *sxml = data;
XML_Parser p = sxml->parser;
PARSE_FAIL(p, "parse failed - DOCTYPE not allowed");
}
struct snapshot_xml *
new_snapshot_xml(XML_Parser p, struct rrdp_session *rs, struct rrdp *r)
{
struct snapshot_xml *sxml;
if ((sxml = calloc(1, sizeof(*sxml))) == NULL)
err(1, "%s", __func__);
sxml->parser = p;
sxml->current = rs;
sxml->rrdp = r;
if (XML_ParserReset(sxml->parser, "US-ASCII") != XML_TRUE)
errx(1, "%s: XML_ParserReset failed", __func__);
XML_SetElementHandler(sxml->parser, snapshot_xml_elem_start,
snapshot_xml_elem_end);
XML_SetCharacterDataHandler(sxml->parser, snapshot_content_handler);
XML_SetUserData(sxml->parser, sxml);
XML_SetDoctypeDeclHandler(sxml->parser, snapshot_doctype_handler,
NULL);
return sxml;
}
void
free_snapshot_xml(struct snapshot_xml *sxml)
{
if (sxml == NULL)
return;
free(sxml->session_id);
free_publish_xml(sxml->pxml);
free(sxml);
}
/* Used in regress. */
void
log_snapshot_xml(struct snapshot_xml *sxml)
{
logx("scope: %d", sxml->scope);
logx("version: %d", sxml->version);
logx("session_id: %s serial: %lld", sxml->session_id, sxml->serial);
}
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