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/* ftp_parser.c
*
* This file contains functions to parse FTP headers.
*
* File begun on 2018-11-13
*
* Created by:
* - Théo Bertin (theo.bertin@advens.fr)
*
* With:
* - François Bernard (francois.bernard@isen.yncrea.fr)
* - Tianyu Geng (tianyu.geng@isen.yncrea.fr)
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "parsers.h"
static const int ftp_cds[] = {
100, 110, 120, 125, 150,
200, 202, 211, 212, 213, 214, 215, 220, 221, 225, 226, 227, 228, 229, 230, 231, 232, 250, 257,
300, 331, 332, 350,
400, 421, 425, 426, 430, 434, 450, 451, 452,
500, 501, 502, 503, 504, 530, 532, 550, 551, 552, 553,
600, 631, 632, 633,
10000, 100054, 10060, 10061, 10066, 10068,
0
};
static const char *ftp_cmds[] = {
"STOR",
"TYPE",
"ABOR",
"ACCT",
"ALLO",
"APPE",
"CDUP",
"CWD",
"DELE",
"HELP",
"LIST",
"MKD",
"MODE",
"NLST",
"NOOP",
"PASS",
"PASV",
"PORT",
"PWD",
"QUIT",
"REIN",
"REST",
"RETR",
"RMD",
"RNFR",
"RNTO",
"SITE",
"SMNT",
"STAT",
"STOU",
"STRU",
"SYST",
"USER",
NULL
};
/*
* This function searches for a valid command in the header (from the list defined in ftp_cmds[])
* and returns either the command or a NULL pointer
*/
static const char *check_Command_ftp(uchar *first_part_packet) {
DBGPRINTF("in check_Command_ftp\n");
DBGPRINTF("first_part_packet : '%s' \n", first_part_packet);
int i = 0;
for (i = 0; ftp_cmds[i] != NULL; i++) {
if (strncmp((const char *)first_part_packet, ftp_cmds[i], strlen((const char *)ftp_cmds[i]) + 1) == 0) {
return ftp_cmds[i];
}
}
return "UNKNOWN";
}
/*
* This function searches for a valid code in the header (from the list defined in ftp_cds[])
* and returns either the command or a NULL pointer
*/
static int check_Code_ftp(uchar *first_part_packet) {
DBGPRINTF("in check_Code_ftp\n");
DBGPRINTF("first_part_packet : %s \n", first_part_packet);
int i = 0;
for (i = 0; ftp_cds[i] != 0; i++) {
if (strtol((const char *)first_part_packet, NULL, 10) == ftp_cds[i]) {
return ftp_cds[i];
}
}
return 0;
}
/*
* This function parses the bytes in the received packet to extract FTP metadata.
*
* its parameters are:
* - a pointer on the list of bytes representing the packet
* the first byte must be the beginning of the FTP header
* - the size of the list passed as first parameter
* - a pointer on a json_object, containing all the metadata recovered so far
* this is also where FTP metadata will be added
*
* This function returns a structure containing the data unprocessed by this parser
* or the ones after (as a list of bytes), and the length of this data.
*/
data_ret_t *ftp_parse(const uchar *packet, int pktSize, struct json_object *jparent) {
DBGPRINTF("ftp_parse\n");
DBGPRINTF("packet size %d\n", pktSize);
if (pktSize < 5) { /* too short for ftp packet*/
RETURN_DATA_AFTER(0)
}
uchar *packet2 = (uchar *)malloc(pktSize * sizeof(uchar));
memcpy(packet2, packet, pktSize); // strtok changes original packet
uchar *frst_part_ftp;
frst_part_ftp = (uchar *)strtok((char *)packet2, " "); // Get first part of packet ftp
strtok(NULL, "\r\n");
if (frst_part_ftp) {
int code = check_Code_ftp(frst_part_ftp);
const char *command = check_Command_ftp(frst_part_ftp);
if (code != 0) {
json_object_object_add(jparent, "FTP_response", json_object_new_int(code));
} else if (command != NULL) {
json_object_object_add(jparent, "FTP_request", json_object_new_string(command));
}
}
free(packet2);
RETURN_DATA_AFTER(0)
}
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