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app-layer-detect-proto.c
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/* Copyright (C) 2007-2022 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <[email protected]>
* \author Anoop Saldanha <[email protected]>
*/
#include "suricata-common.h"
#include "decode.h"
#include "threads.h"
#include "threadvars.h"
#include "tm-threads.h"
#include "detect.h"
#include "detect-engine-port.h"
#include "detect-engine-build.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-content.h"
#include "detect-engine-mpm.h"
#include "detect-engine-state.h"
#include "util-print.h"
#include "util-pool.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-validate.h"
#include "flow.h"
#include "flow-util.h"
#include "flow-private.h"
#include "stream-tcp-private.h"
#include "stream-tcp-reassemble.h"
#include "stream-tcp.h"
#include "stream.h"
#include "app-layer.h"
#include "app-layer-protos.h"
#include "app-layer-parser.h"
#include "app-layer-detect-proto.h"
#include "app-layer-expectation.h"
#include "conf.h"
#include "util-memcmp.h"
#include "util-spm.h"
#include "util-debug.h"
#include "runmodes.h"
typedef struct AppLayerProtoDetectProbingParserElement_ {
AppProto alproto;
/* \todo calculate at runtime and get rid of this var */
uint32_t alproto_mask;
/* the min length of data that has to be supplied to invoke the parser */
uint16_t min_depth;
/* the max length of data after which this parser won't be invoked */
uint16_t max_depth;
/* the to_server probing parser function */
ProbingParserFPtr ProbingParserTs;
/* the to_client probing parser function */
ProbingParserFPtr ProbingParserTc;
struct AppLayerProtoDetectProbingParserElement_ *next;
} AppLayerProtoDetectProbingParserElement;
typedef struct AppLayerProtoDetectProbingParserPort_ {
/* the port no for which probing parser(s) are invoked */
uint16_t port;
/* wether to use this probing parser port-based */
// WebSocket has this set to false as it only works with protocol change
bool use_ports;
uint32_t alproto_mask;
/* the max depth for all the probing parsers registered for this port */
uint16_t dp_max_depth;
uint16_t sp_max_depth;
AppLayerProtoDetectProbingParserElement *dp;
AppLayerProtoDetectProbingParserElement *sp;
struct AppLayerProtoDetectProbingParserPort_ *next;
} AppLayerProtoDetectProbingParserPort;
typedef struct AppLayerProtoDetectProbingParser_ {
uint8_t ipproto;
AppLayerProtoDetectProbingParserPort *port;
struct AppLayerProtoDetectProbingParser_ *next;
} AppLayerProtoDetectProbingParser;
typedef struct AppLayerProtoDetectPMSignature_ {
AppProto alproto;
uint8_t direction; /**< direction for midstream */
SigIntId id;
/* \todo Change this into a non-pointer */
DetectContentData *cd;
uint16_t pp_min_depth;
uint16_t pp_max_depth;
ProbingParserFPtr PPFunc;
struct AppLayerProtoDetectPMSignature_ *next;
} AppLayerProtoDetectPMSignature;
typedef struct AppLayerProtoDetectPMCtx_ {
uint16_t pp_max_len;
uint16_t min_len;
MpmCtx mpm_ctx;
/** Mapping between pattern id and signature. As each signature has a
* unique pattern with a unique id, we can lookup the signature by
* the pattern id. */
AppLayerProtoDetectPMSignature **map;
AppLayerProtoDetectPMSignature *head;
/* \todo we don't need this except at setup time. Get rid of it. */
PatIntId max_pat_id;
SigIntId max_sig_id;
} AppLayerProtoDetectPMCtx;
typedef struct AppLayerProtoDetectCtxIpproto_ {
/* 0 - toserver, 1 - toclient */
AppLayerProtoDetectPMCtx ctx_pm[2];
} AppLayerProtoDetectCtxIpproto;
/**
* \brief The app layer protocol detection context.
*/
typedef struct AppLayerProtoDetectCtx_ {
/* Context per ip_proto.
* \todo Modify ctx_ipp to hold for only tcp and udp. The rest can be
* implemented if needed. Waste of space otherwise. */
AppLayerProtoDetectCtxIpproto ctx_ipp[FLOW_PROTO_DEFAULT];
/* Global SPM thread context prototype. */
SpmGlobalThreadCtx *spm_global_thread_ctx;
AppLayerProtoDetectProbingParser *ctx_pp;
/* Indicates the protocols that have registered themselves
* for protocol detection. This table is independent of the
* ipproto. */
const char *alproto_names[ALPROTO_MAX];
} AppLayerProtoDetectCtx;
typedef struct AppLayerProtoDetectAliases_ {
const char *proto_name;
const char *proto_alias;
struct AppLayerProtoDetectAliases_ *next;
} AppLayerProtoDetectAliases;
/**
* \brief The app layer protocol detection thread context.
*/
struct AppLayerProtoDetectThreadCtx_ {
PrefilterRuleStore pmq;
/* The value 2 is for direction(0 - toserver, 1 - toclient). */
MpmThreadCtx mpm_tctx[FLOW_PROTO_DEFAULT][2];
SpmThreadCtx *spm_thread_ctx;
};
/* The global app layer proto detection context. */
static AppLayerProtoDetectCtx alpd_ctx;
static AppLayerProtoDetectAliases *alpda_ctx = NULL;
static void AppLayerProtoDetectPEGetIpprotos(AppProto alproto,
uint8_t *ipprotos);
/***** Static Internal Calls: Protocol Retrieval *****/
/** \internal
* \brief Handle SPM search for Signature
* \param buflen full size of the input buffer
* \param searchlen pattern matching portion of buffer */
static AppProto AppLayerProtoDetectPMMatchSignature(const AppLayerProtoDetectPMSignature *s,
AppLayerProtoDetectThreadCtx *tctx, Flow *f, uint8_t flags, const uint8_t *buf,
uint32_t buflen, uint16_t searchlen, bool *rflow)
{
SCEnter();
if (s->cd->offset > searchlen) {
SCLogDebug("s->co->offset (%"PRIu16") > searchlen (%"PRIu16")",
s->cd->offset, searchlen);
SCReturnUInt(ALPROTO_UNKNOWN);
}
if (s->cd->depth > searchlen) {
SCLogDebug("s->co->depth (%"PRIu16") > searchlen (%"PRIu16")",
s->cd->depth, searchlen);
SCReturnUInt(ALPROTO_UNKNOWN);
}
const uint8_t *sbuf = buf + s->cd->offset;
uint16_t ssearchlen = s->cd->depth - s->cd->offset;
SCLogDebug("s->co->offset (%"PRIu16") s->cd->depth (%"PRIu16")",
s->cd->offset, s->cd->depth);
uint8_t *found = SpmScan(s->cd->spm_ctx, tctx->spm_thread_ctx,
sbuf, ssearchlen);
if (found == NULL) {
SCReturnUInt(ALPROTO_UNKNOWN);
}
uint8_t direction = (flags & (STREAM_TOSERVER | STREAM_TOCLIENT));
SCLogDebug("matching, s->direction %s, our dir %s",
(s->direction & STREAM_TOSERVER) ? "toserver" : "toclient",
(flags & STREAM_TOSERVER) ? "toserver" : "toclient");
if (s->PPFunc == NULL) {
if (direction == s->direction) {
SCLogDebug("direction is correct");
} else {
SCLogDebug("direction is wrong, rflow = true");
*rflow = true;
}
/* validate using Probing Parser */
} else {
if (s->pp_min_depth > buflen) {
SCLogDebug("PP can't be run yet as pp_min_depth %u > buflen %u",
s->pp_min_depth, buflen);
SCReturnInt(ALPROTO_UNKNOWN);
}
uint8_t rdir = 0;
AppProto r = s->PPFunc(f, flags, buf, buflen, &rdir);
if (r == s->alproto) {
SCLogDebug("found %s/%u, rdir %02x reverse_flow? %s",
AppProtoToString(r), r, rdir,
(rdir && direction != rdir) ? "true" : "false");
*rflow = (rdir && direction != rdir);
SCReturnUInt(s->alproto);
} else if (r == ALPROTO_FAILED) {
SCReturnUInt(ALPROTO_FAILED);
} else {
/* unknown: lets see if we will try again later */
if (s->pp_max_depth < buflen) {
SCLogDebug("depth reached and answer inconclusive: fail");
SCReturnUInt(ALPROTO_FAILED);
}
SCReturnUInt(ALPROTO_UNKNOWN);
}
}
SCReturnUInt(s->alproto);
}
/**
* \retval 0 no matches
* \retval -1 no matches, mpm depth reached
*/
static inline int PMGetProtoInspect(AppLayerProtoDetectThreadCtx *tctx,
AppLayerProtoDetectPMCtx *pm_ctx, MpmThreadCtx *mpm_tctx, Flow *f, const uint8_t *buf,
uint32_t buflen, uint8_t flags, AppProto *pm_results, bool *rflow)
{
int pm_matches = 0;
// maxdepth is u16, so minimum is u16
uint16_t searchlen = (uint16_t)MIN(buflen, pm_ctx->mpm_ctx.maxdepth);
SCLogDebug("searchlen %u buflen %u", searchlen, buflen);
/* do the mpm search */
uint32_t search_cnt = mpm_table[pm_ctx->mpm_ctx.mpm_type].Search(
&pm_ctx->mpm_ctx, mpm_tctx, &tctx->pmq,
buf, searchlen);
if (search_cnt == 0) {
if (buflen >= pm_ctx->mpm_ctx.maxdepth)
return -1;
return 0;
}
/* alproto bit field */
uint8_t pm_results_bf[(ALPROTO_MAX / 8) + 1];
memset(pm_results_bf, 0, sizeof(pm_results_bf));
/* loop through unique pattern id's. Can't use search_cnt here,
* as that contains all matches, tctx->pmq.pattern_id_array_cnt
* contains only *unique* matches. */
for (uint32_t cnt = 0; cnt < tctx->pmq.rule_id_array_cnt; cnt++) {
const AppLayerProtoDetectPMSignature *s = pm_ctx->map[tctx->pmq.rule_id_array[cnt]];
while (s != NULL) {
AppProto proto = AppLayerProtoDetectPMMatchSignature(
s, tctx, f, flags, buf, buflen, searchlen, rflow);
/* store each unique proto once */
if (AppProtoIsValid(proto) &&
!(pm_results_bf[proto / 8] & (1 << (proto % 8))) )
{
pm_results[pm_matches++] = proto;
pm_results_bf[proto / 8] |= 1 << (proto % 8);
}
s = s->next;
}
}
if (pm_matches == 0 && buflen >= pm_ctx->pp_max_len) {
pm_matches = -2;
}
PmqReset(&tctx->pmq);
return pm_matches;
}
/** \internal
* \brief Run Pattern Sigs against buffer
* \param direction direction for the patterns
* \param pm_results[out] AppProto array of size ALPROTO_MAX */
static AppProto AppLayerProtoDetectPMGetProto(AppLayerProtoDetectThreadCtx *tctx, Flow *f,
const uint8_t *buf, uint32_t buflen, uint8_t flags, AppProto *pm_results, bool *rflow)
{
SCEnter();
pm_results[0] = ALPROTO_UNKNOWN;
AppLayerProtoDetectPMCtx *pm_ctx;
MpmThreadCtx *mpm_tctx;
int m = -1;
if (f->protomap >= FLOW_PROTO_DEFAULT) {
pm_results[0] = ALPROTO_FAILED;
SCReturnUInt(1);
}
if (flags & STREAM_TOSERVER) {
pm_ctx = &alpd_ctx.ctx_ipp[f->protomap].ctx_pm[0];
mpm_tctx = &tctx->mpm_tctx[f->protomap][0];
} else {
pm_ctx = &alpd_ctx.ctx_ipp[f->protomap].ctx_pm[1];
mpm_tctx = &tctx->mpm_tctx[f->protomap][1];
}
if (likely(pm_ctx->mpm_ctx.pattern_cnt > 0)) {
m = PMGetProtoInspect(tctx, pm_ctx, mpm_tctx, f, buf, buflen, flags, pm_results, rflow);
}
/* pattern found, yay */
if (m > 0) {
FLOW_SET_PM_DONE(f, flags);
SCReturnUInt((uint16_t)m);
/* handle non-found in non-midstream case */
} else if (!stream_config.midstream) {
/* we can give up if mpm gave no results and its search depth
* was reached. */
if (m < 0) {
FLOW_SET_PM_DONE(f, flags);
SCReturnUInt(0);
} else if (m == 0) {
SCReturnUInt(0);
}
SCReturnUInt((uint16_t)m);
/* handle non-found in midstream case */
} else if (m <= 0) {
if (flags & STREAM_TOSERVER) {
pm_ctx = &alpd_ctx.ctx_ipp[f->protomap].ctx_pm[1];
mpm_tctx = &tctx->mpm_tctx[f->protomap][1];
} else {
pm_ctx = &alpd_ctx.ctx_ipp[f->protomap].ctx_pm[0];
mpm_tctx = &tctx->mpm_tctx[f->protomap][0];
}
SCLogDebug("no matches and in midstream mode, lets try the "
"*patterns for the other side");
int om = -1;
if (likely(pm_ctx->mpm_ctx.pattern_cnt > 0)) {
om = PMGetProtoInspect(
tctx, pm_ctx, mpm_tctx, f, buf, buflen, flags, pm_results, rflow);
}
/* found! */
if (om > 0) {
FLOW_SET_PM_DONE(f, flags);
SCReturnUInt((uint16_t)om);
/* both sides failed */
} else if (om < 0 && m && m < 0) {
FLOW_SET_PM_DONE(f, flags);
SCReturnUInt(0);
/* one side still uncertain */
} else if (om == 0 || m == 0) {
SCReturnUInt(0);
}
}
SCReturnUInt(0);
}
static AppLayerProtoDetectProbingParserElement *AppLayerProtoDetectGetProbingParser(
AppLayerProtoDetectProbingParser *pp, uint8_t ipproto, AppProto alproto)
{
AppLayerProtoDetectProbingParserElement *pp_elem = NULL;
AppLayerProtoDetectProbingParserPort *pp_port = NULL;
while (pp != NULL) {
if (pp->ipproto == ipproto)
break;
pp = pp->next;
}
if (pp == NULL)
return NULL;
pp_port = pp->port;
while (pp_port != NULL) {
if (pp_port->dp != NULL && pp_port->dp->alproto == alproto) {
pp_elem = pp_port->dp;
break;
}
if (pp_port->sp != NULL && pp_port->sp->alproto == alproto) {
pp_elem = pp_port->sp;
break;
}
pp_port = pp_port->next;
}
SCReturnPtr(pp_elem, "AppLayerProtoDetectProbingParserElement *");
}
static AppLayerProtoDetectProbingParserPort *AppLayerProtoDetectGetProbingParsers(AppLayerProtoDetectProbingParser *pp,
uint8_t ipproto,
uint16_t port)
{
AppLayerProtoDetectProbingParserPort *pp_port = NULL;
while (pp != NULL) {
if (pp->ipproto == ipproto)
break;
pp = pp->next;
}
if (pp == NULL)
goto end;
pp_port = pp->port;
while (pp_port != NULL) {
// always check use_ports
if ((pp_port->port == port || pp_port->port == 0) && pp_port->use_ports) {
break;
}
pp_port = pp_port->next;
}
end:
SCReturnPtr(pp_port, "AppLayerProtoDetectProbingParserPort *");
}
/**
* \brief Call the probing expectation to see if there is some for this flow.
*
*/
static AppProto AppLayerProtoDetectPEGetProto(Flow *f, uint8_t flags)
{
AppProto alproto = ALPROTO_UNKNOWN;
SCLogDebug("expectation check for %p (dir %d)", f, flags);
FLOW_SET_PE_DONE(f, flags);
alproto = AppLayerExpectationHandle(f, flags);
return alproto;
}
static inline AppProto PPGetProto(const AppLayerProtoDetectProbingParserElement *pe, Flow *f,
uint8_t flags, const uint8_t *buf, uint32_t buflen, uint32_t *alproto_masks, uint8_t *rdir)
{
while (pe != NULL) {
if ((buflen < pe->min_depth) ||
(alproto_masks[0] & pe->alproto_mask)) {
pe = pe->next;
continue;
}
AppProto alproto = ALPROTO_UNKNOWN;
if (flags & STREAM_TOSERVER && pe->ProbingParserTs != NULL) {
alproto = pe->ProbingParserTs(f, flags, buf, buflen, rdir);
} else if (flags & STREAM_TOCLIENT && pe->ProbingParserTc != NULL) {
alproto = pe->ProbingParserTc(f, flags, buf, buflen, rdir);
}
if (AppProtoIsValid(alproto)) {
SCReturnUInt(alproto);
}
if (alproto == ALPROTO_FAILED ||
(pe->max_depth != 0 && buflen > pe->max_depth)) {
alproto_masks[0] |= pe->alproto_mask;
}
pe = pe->next;
}
SCReturnUInt(ALPROTO_UNKNOWN);
}
/**
* \brief Call the probing parser if it exists for this flow.
*
* First we check the flow's dp as it's most likely to match. If that didn't
* lead to a PP, we try the sp.
*
*/
static AppProto AppLayerProtoDetectPPGetProto(Flow *f, const uint8_t *buf, uint32_t buflen,
uint8_t ipproto, const uint8_t flags, bool *reverse_flow)
{
const AppLayerProtoDetectProbingParserPort *pp_port_dp = NULL;
const AppLayerProtoDetectProbingParserPort *pp_port_sp = NULL;
const AppLayerProtoDetectProbingParserElement *pe0 = NULL;
const AppLayerProtoDetectProbingParserElement *pe1 = NULL;
const AppLayerProtoDetectProbingParserElement *pe2 = NULL;
AppProto alproto = ALPROTO_UNKNOWN;
uint32_t *alproto_masks = NULL;
uint32_t mask = 0;
uint8_t idir = (flags & (STREAM_TOSERVER | STREAM_TOCLIENT));
uint8_t dir = idir;
uint16_t dp = f->protodetect_dp ? f->protodetect_dp : FLOW_GET_DP(f);
uint16_t sp = FLOW_GET_SP(f);
bool probe_is_found = false;
again_midstream:
if (idir != dir) {
SWAP_VARS(uint16_t, dp, sp); /* look up parsers in rev dir */
}
SCLogDebug("%u->%u %s", sp, dp,
(dir == STREAM_TOSERVER) ? "toserver" : "toclient");
if (dir == STREAM_TOSERVER) {
/* first try the destination port */
pp_port_dp = AppLayerProtoDetectGetProbingParsers(alpd_ctx.ctx_pp, ipproto, dp);
alproto_masks = &f->probing_parser_toserver_alproto_masks;
if (pp_port_dp != NULL) {
SCLogDebug("toserver - Probing parser found for destination port %"PRIu16, dp);
/* found based on destination port, so use dp registration */
pe1 = pp_port_dp->dp;
} else {
SCLogDebug("toserver - No probing parser registered for dest port %"PRIu16, dp);
}
pp_port_sp = AppLayerProtoDetectGetProbingParsers(alpd_ctx.ctx_pp, ipproto, sp);
if (pp_port_sp != NULL) {
SCLogDebug("toserver - Probing parser found for source port %"PRIu16, sp);
/* found based on source port, so use sp registration */
pe2 = pp_port_sp->sp;
} else {
SCLogDebug("toserver - No probing parser registered for source port %"PRIu16, sp);
}
} else {
/* first try the destination port */
pp_port_dp = AppLayerProtoDetectGetProbingParsers(alpd_ctx.ctx_pp, ipproto, dp);
if (dir == idir) {
// do not update alproto_masks to let a chance to second packet
// for instance when sending a junk packet to a DNS server
alproto_masks = &f->probing_parser_toclient_alproto_masks;
}
if (pp_port_dp != NULL) {
SCLogDebug("toclient - Probing parser found for destination port %"PRIu16, dp);
/* found based on destination port, so use dp registration */
pe1 = pp_port_dp->dp;
} else {
SCLogDebug("toclient - No probing parser registered for dest port %"PRIu16, dp);
}
pp_port_sp = AppLayerProtoDetectGetProbingParsers(alpd_ctx.ctx_pp, ipproto, sp);
if (pp_port_sp != NULL) {
SCLogDebug("toclient - Probing parser found for source port %"PRIu16, sp);
pe2 = pp_port_sp->sp;
} else {
SCLogDebug("toclient - No probing parser registered for source port %"PRIu16, sp);
}
}
if (f->alproto_expect != ALPROTO_UNKNOWN) {
// needed for websocket which does not use ports
pe0 = AppLayerProtoDetectGetProbingParser(alpd_ctx.ctx_pp, ipproto, f->alproto_expect);
} else if (dir == STREAM_TOSERVER && f->alproto_tc != ALPROTO_UNKNOWN) {
pe0 = AppLayerProtoDetectGetProbingParser(alpd_ctx.ctx_pp, ipproto, f->alproto_tc);
} else if (dir == STREAM_TOCLIENT && f->alproto_ts != ALPROTO_UNKNOWN) {
pe0 = AppLayerProtoDetectGetProbingParser(alpd_ctx.ctx_pp, ipproto, f->alproto_ts);
}
if (pe1 == NULL && pe2 == NULL && pe0 == NULL) {
SCLogDebug("%s - No probing parsers found for either port",
(dir == STREAM_TOSERVER) ? "toserver":"toclient");
goto noparsers;
} else {
probe_is_found = true;
}
/* run the parser(s): always call with original direction */
uint8_t rdir = 0;
alproto = PPGetProto(pe0, f, flags, buf, buflen, alproto_masks, &rdir);
if (AppProtoIsValid(alproto))
goto end;
alproto = PPGetProto(pe1, f, flags, buf, buflen, alproto_masks, &rdir);
if (AppProtoIsValid(alproto))
goto end;
alproto = PPGetProto(pe2, f, flags, buf, buflen, alproto_masks, &rdir);
if (AppProtoIsValid(alproto))
goto end;
/* get the mask we need for this direction */
if (dir == idir) {
if (pp_port_dp && pp_port_sp)
mask = pp_port_dp->alproto_mask|pp_port_sp->alproto_mask;
else if (pp_port_dp)
mask = pp_port_dp->alproto_mask;
else if (pp_port_sp)
mask = pp_port_sp->alproto_mask;
if (alproto_masks[0] == mask) {
FLOW_SET_PP_DONE(f, dir);
SCLogDebug("%s, mask is now %08x, needed %08x, so done",
(dir == STREAM_TOSERVER) ? "toserver":"toclient",
alproto_masks[0], mask);
} else {
SCLogDebug("%s, mask is now %08x, need %08x",
(dir == STREAM_TOSERVER) ? "toserver":"toclient",
alproto_masks[0], mask);
}
}
noparsers:
if (stream_config.midstream && idir == dir) {
if (idir == STREAM_TOSERVER) {
dir = STREAM_TOCLIENT;
} else {
dir = STREAM_TOSERVER;
}
SCLogDebug("no match + midstream, retry the other direction %s",
(dir == STREAM_TOSERVER) ? "toserver" : "toclient");
goto again_midstream;
} else if (!probe_is_found) {
FLOW_SET_PP_DONE(f, idir);
}
end:
if (AppProtoIsValid(alproto) && rdir != 0 && rdir != idir) {
SCLogDebug("PP found %u, is reverse flow", alproto);
*reverse_flow = true;
}
SCLogDebug("%s, mask is now %08x",
(idir == STREAM_TOSERVER) ? "toserver":"toclient", alproto_masks[0]);
SCReturnUInt(alproto);
}
/***** Static Internal Calls: PP registration *****/
static void AppLayerProtoDetectPPGetIpprotos(AppProto alproto,
uint8_t *ipprotos)
{
SCEnter();
const AppLayerProtoDetectProbingParser *pp;
const AppLayerProtoDetectProbingParserPort *pp_port;
const AppLayerProtoDetectProbingParserElement *pp_pe;
for (pp = alpd_ctx.ctx_pp; pp != NULL; pp = pp->next) {
for (pp_port = pp->port; pp_port != NULL; pp_port = pp_port->next) {
for (pp_pe = pp_port->dp; pp_pe != NULL; pp_pe = pp_pe->next) {
if (alproto == pp_pe->alproto)
ipprotos[pp->ipproto / 8] |= 1 << (pp->ipproto % 8);
}
for (pp_pe = pp_port->sp; pp_pe != NULL; pp_pe = pp_pe->next) {
if (alproto == pp_pe->alproto)
ipprotos[pp->ipproto / 8] |= 1 << (pp->ipproto % 8);
}
}
}
SCReturn;
}
static uint32_t AppLayerProtoDetectProbingParserGetMask(AppProto alproto)
{
SCEnter();
if (!(alproto > ALPROTO_UNKNOWN && alproto < ALPROTO_FAILED)) {
FatalError("Unknown protocol detected - %u", alproto);
}
SCReturnUInt(BIT_U32(alproto));
}
static AppLayerProtoDetectProbingParserElement *AppLayerProtoDetectProbingParserElementAlloc(void)
{
SCEnter();
AppLayerProtoDetectProbingParserElement *p =
SCCalloc(1, sizeof(AppLayerProtoDetectProbingParserElement));
if (unlikely(p == NULL)) {
exit(EXIT_FAILURE);
}
SCReturnPtr(p, "AppLayerProtoDetectProbingParserElement");
}
static void AppLayerProtoDetectProbingParserElementFree(AppLayerProtoDetectProbingParserElement *p)
{
SCEnter();
SCFree(p);
SCReturn;
}
static AppLayerProtoDetectProbingParserPort *AppLayerProtoDetectProbingParserPortAlloc(void)
{
SCEnter();
AppLayerProtoDetectProbingParserPort *p =
SCCalloc(1, sizeof(AppLayerProtoDetectProbingParserPort));
if (unlikely(p == NULL)) {
exit(EXIT_FAILURE);
}
SCReturnPtr(p, "AppLayerProtoDetectProbingParserPort");
}
static void AppLayerProtoDetectProbingParserPortFree(AppLayerProtoDetectProbingParserPort *p)
{
SCEnter();
AppLayerProtoDetectProbingParserElement *e;
e = p->dp;
while (e != NULL) {
AppLayerProtoDetectProbingParserElement *e_next = e->next;
AppLayerProtoDetectProbingParserElementFree(e);
e = e_next;
}
e = p->sp;
while (e != NULL) {
AppLayerProtoDetectProbingParserElement *e_next = e->next;
AppLayerProtoDetectProbingParserElementFree(e);
e = e_next;
}
SCFree(p);
SCReturn;
}
static AppLayerProtoDetectProbingParser *AppLayerProtoDetectProbingParserAlloc(void)
{
SCEnter();
AppLayerProtoDetectProbingParser *p = SCCalloc(1, sizeof(AppLayerProtoDetectProbingParser));
if (unlikely(p == NULL)) {
exit(EXIT_FAILURE);
}
SCReturnPtr(p, "AppLayerProtoDetectProbingParser");
}
static void AppLayerProtoDetectProbingParserFree(AppLayerProtoDetectProbingParser *p)
{
SCEnter();
AppLayerProtoDetectProbingParserPort *pt = p->port;
while (pt != NULL) {
AppLayerProtoDetectProbingParserPort *pt_next = pt->next;
AppLayerProtoDetectProbingParserPortFree(pt);
pt = pt_next;
}
SCFree(p);
SCReturn;
}
static AppLayerProtoDetectProbingParserElement *AppLayerProtoDetectProbingParserElementCreate(
AppProto alproto, uint16_t min_depth, uint16_t max_depth)
{
AppLayerProtoDetectProbingParserElement *pe = AppLayerProtoDetectProbingParserElementAlloc();
pe->alproto = alproto;
pe->alproto_mask = AppLayerProtoDetectProbingParserGetMask(alproto);
pe->min_depth = min_depth;
pe->max_depth = max_depth;
pe->next = NULL;
if (max_depth != 0 && min_depth >= max_depth) {
SCLogError("Invalid arguments sent to "
"register the probing parser. min_depth >= max_depth");
goto error;
}
if (alproto <= ALPROTO_UNKNOWN || alproto >= ALPROTO_MAX) {
SCLogError("Invalid arguments sent to register "
"the probing parser. Invalid alproto - %d",
alproto);
goto error;
}
SCReturnPtr(pe, "AppLayerProtoDetectProbingParserElement");
error:
AppLayerProtoDetectProbingParserElementFree(pe);
SCReturnPtr(NULL, "AppLayerProtoDetectProbingParserElement");
}
static AppLayerProtoDetectProbingParserElement *
AppLayerProtoDetectProbingParserElementDuplicate(AppLayerProtoDetectProbingParserElement *pe)
{
SCEnter();
AppLayerProtoDetectProbingParserElement *new_pe = AppLayerProtoDetectProbingParserElementAlloc();
new_pe->alproto = pe->alproto;
new_pe->alproto_mask = pe->alproto_mask;
new_pe->min_depth = pe->min_depth;
new_pe->max_depth = pe->max_depth;
new_pe->ProbingParserTs = pe->ProbingParserTs;
new_pe->ProbingParserTc = pe->ProbingParserTc;
new_pe->next = NULL;
SCReturnPtr(new_pe, "AppLayerProtoDetectProbingParserElement");
}
#ifdef DEBUG
static void AppLayerProtoDetectPrintProbingParsers(AppLayerProtoDetectProbingParser *pp)
{
SCEnter();
AppLayerProtoDetectProbingParserPort *pp_port = NULL;
AppLayerProtoDetectProbingParserElement *pp_pe = NULL;
printf("\nProtocol Detection Configuration\n");
for ( ; pp != NULL; pp = pp->next) {
/* print ip protocol */
if (pp->ipproto == IPPROTO_TCP)
printf("IPProto: TCP\n");
else if (pp->ipproto == IPPROTO_UDP)
printf("IPProto: UDP\n");
else
printf("IPProto: %"PRIu8"\n", pp->ipproto);
pp_port = pp->port;
for ( ; pp_port != NULL; pp_port = pp_port->next) {
if (pp_port->dp != NULL) {
printf(" Port: %"PRIu16 "\n", pp_port->port);
printf(" Destination port: (max-depth: %"PRIu16 ", "
"mask - %"PRIu32")\n",
pp_port->dp_max_depth,
pp_port->alproto_mask);
pp_pe = pp_port->dp;
for ( ; pp_pe != NULL; pp_pe = pp_pe->next) {
printf(" alproto: %s\n", AppProtoToString(pp_pe->alproto));
printf(" mask: %"PRIu32 "\n", pp_pe->alproto_mask);
printf(" min_depth: %"PRIu32 "\n", pp_pe->min_depth);
printf(" max_depth: %"PRIu32 "\n", pp_pe->max_depth);
printf("\n");
}
}
if (pp_port->sp == NULL) {
continue;
}
printf(" Source port: (max-depth: %"PRIu16 ", "
"mask - %"PRIu32")\n",
pp_port->sp_max_depth,
pp_port->alproto_mask);
pp_pe = pp_port->sp;
for ( ; pp_pe != NULL; pp_pe = pp_pe->next) {
printf(" alproto: %s\n", AppProtoToString(pp_pe->alproto));
printf(" mask: %"PRIu32 "\n", pp_pe->alproto_mask);
printf(" min_depth: %"PRIu32 "\n", pp_pe->min_depth);
printf(" max_depth: %"PRIu32 "\n", pp_pe->max_depth);
printf("\n");
}
}
}
SCReturn;
}
#endif
static void AppLayerProtoDetectProbingParserElementAppend(AppLayerProtoDetectProbingParserElement **head_pe,
AppLayerProtoDetectProbingParserElement *new_pe)
{
SCEnter();
if (*head_pe == NULL) {
*head_pe = new_pe;
SCReturn;
}
AppLayerProtoDetectProbingParserElement *temp_pe = *head_pe;
while (temp_pe->next != NULL)
temp_pe = temp_pe->next;
temp_pe->next = new_pe;
SCReturn;
}
static void AppLayerProtoDetectProbingParserAppend(AppLayerProtoDetectProbingParser **head_pp,
AppLayerProtoDetectProbingParser *new_pp)
{
SCEnter();
if (*head_pp == NULL) {
*head_pp = new_pp;
goto end;
}
AppLayerProtoDetectProbingParser *temp_pp = *head_pp;
while (temp_pp->next != NULL)
temp_pp = temp_pp->next;
temp_pp->next = new_pp;
end:
SCReturn;
}
static void AppLayerProtoDetectProbingParserPortAppend(AppLayerProtoDetectProbingParserPort **head_port,
AppLayerProtoDetectProbingParserPort *new_port)
{
SCEnter();
if (*head_port == NULL) {
*head_port = new_port;
goto end;
}
// port == 0 && use_ports is special run on any ports, kept at tail
if ((*head_port)->port == 0 && (*head_port)->use_ports) {
new_port->next = *head_port;
*head_port = new_port;
} else {
AppLayerProtoDetectProbingParserPort *temp_port = *head_port;
while (temp_port->next != NULL &&
!(temp_port->next->port == 0 && temp_port->next->use_ports)) {
temp_port = temp_port->next;
}
new_port->next = temp_port->next;
temp_port->next = new_port;
}
end:
SCReturn;
}
static void AppLayerProtoDetectInsertNewProbingParser(AppLayerProtoDetectProbingParser **pp,
uint8_t ipproto, bool use_ports, uint16_t port, AppProto alproto, uint16_t min_depth,
uint16_t max_depth, uint8_t direction, ProbingParserFPtr ProbingParser1,
ProbingParserFPtr ProbingParser2)
{
SCEnter();
/* get the top level ipproto pp */
AppLayerProtoDetectProbingParser *curr_pp = *pp;
while (curr_pp != NULL) {
if (curr_pp->ipproto == ipproto)
break;
curr_pp = curr_pp->next;
}
if (curr_pp == NULL) {
AppLayerProtoDetectProbingParser *new_pp = AppLayerProtoDetectProbingParserAlloc();
new_pp->ipproto = ipproto;
AppLayerProtoDetectProbingParserAppend(pp, new_pp);
curr_pp = new_pp;
}
/* get the top level port pp */
AppLayerProtoDetectProbingParserPort *curr_port = curr_pp->port;
while (curr_port != NULL) {
// when not use_ports, always insert a new AppLayerProtoDetectProbingParserPort
if (curr_port->port == port && use_ports)
break;
curr_port = curr_port->next;
}
if (curr_port == NULL) {
AppLayerProtoDetectProbingParserPort *new_port = AppLayerProtoDetectProbingParserPortAlloc();
new_port->port = port;
new_port->use_ports = use_ports;
AppLayerProtoDetectProbingParserPortAppend(&curr_pp->port, new_port);
curr_port = new_port;
if (direction & STREAM_TOSERVER) {
curr_port->dp_max_depth = max_depth;
} else {
curr_port->sp_max_depth = max_depth;
}