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authormjm <mjm>2002-11-23 21:42:41 (UTC)
committer mjm <mjm>2002-11-23 21:42:41 (UTC)
commitc93ded2c1256817b9c974c792cd143315b98fff7 (patch) (side-by-side diff)
tree7de5b3fc8eee930f72c4e3ef662f48948a60d935
parent4e24ece4607d3b2f9e3252fa561fabaa9cdddd63 (diff)
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implemented sniffer function in daemon.cc
Diffstat (more/less context) (ignore whitespace changes)
-rw-r--r--noncore/net/wellenreiter/daemon/source/Makefile7
-rw-r--r--noncore/net/wellenreiter/daemon/source/TODO1
-rw-r--r--noncore/net/wellenreiter/daemon/source/cardmode.cc3
-rw-r--r--noncore/net/wellenreiter/daemon/source/cardmode.hh4
-rw-r--r--noncore/net/wellenreiter/daemon/source/daemon.cc50
-rw-r--r--noncore/net/wellenreiter/daemon/source/sniffer.cc41
-rw-r--r--noncore/net/wellenreiter/daemon/source/sniffer.hh8
7 files changed, 38 insertions, 76 deletions
diff --git a/noncore/net/wellenreiter/daemon/source/Makefile b/noncore/net/wellenreiter/daemon/source/Makefile
index bcbc799..f3f41f0 100644
--- a/noncore/net/wellenreiter/daemon/source/Makefile
+++ b/noncore/net/wellenreiter/daemon/source/Makefile
@@ -1,33 +1,28 @@
# $Id$
CPP = g++
OPTIMFLAGS = -g
WARNFLAGS = -Wall -pedantic -DDEBUG
LDFLAGS =
LIBS = -lpcap ../../libwellenreiter/source/libwellenreiter.a
-OBJ = daemon.o
+OBJ = daemon.o cardmode.o sniffer.o
.SUFFIXES:
.PHONY: all wellenreiterd clean distclean realclean
%.o : %.cc
$(CPP) $(WARNFLAGS) $(OPTIMFLAGS) -c $< -o $@
all: wellenreiterd
wellenreiterd: $(OBJ)
$(CPP) $(OPTIMFLAGS) $(WARNFLAGS) $(OBJ) $(LDFLAGS) $(LIBS) -o $@
@echo Build wellenreiterd
-sniffer: sniffer.o cardmode.o
- $(CPP) $(OPTIMFLAGS) $(WARNFLAGS) sniffer.o cardmode.o $(LDFLAGS) $(LIBS) -o $@
- @echo Build sniffer
-
-
clean distclean realclean:
@rm -rf wellenreiterd *~ *.o
@echo All dependent files have been removed.
daemon.o: config.hh
diff --git a/noncore/net/wellenreiter/daemon/source/TODO b/noncore/net/wellenreiter/daemon/source/TODO
index 39b1a05..2d72ab7 100644
--- a/noncore/net/wellenreiter/daemon/source/TODO
+++ b/noncore/net/wellenreiter/daemon/source/TODO
@@ -1,5 +1,4 @@
implement communication protocol
security analysis
-implement sniffer (last step)
security analysis
code cleanup \ No newline at end of file
diff --git a/noncore/net/wellenreiter/daemon/source/cardmode.cc b/noncore/net/wellenreiter/daemon/source/cardmode.cc
index f84ce23..8069edc 100644
--- a/noncore/net/wellenreiter/daemon/source/cardmode.cc
+++ b/noncore/net/wellenreiter/daemon/source/cardmode.cc
@@ -1,89 +1,90 @@
/* $Id$ */
+#include "config.hh"
#include "cardmode.hh"
int card_into_monitormode (char *device, int cardtype)
{
int datalink; /* used for getting the pcap datalink type */
char CiscoRFMON[35] = "/proc/driver/aironet/";
FILE *CISCO_CONFIG_FILE;
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *handle;
/* Checks if we have a device to sniff on */
if(device == NULL)
{
printf ("Fatal error i did not have any interfaces to sniff on\n");
return 0;
- }
+ }
/* Setting the prmiscous and up flag to the interface */
if (card_set_promisc_up (device) == 0)
{
printf ("Interface flags correctly set using ifconfig\n");
}
/* Check the cardtype and executes the commands to go into monitor mode */
if (cardtype == CARD_TYPE_CISCO) /* I got a cisco card */
{
/* bring the sniffer into rfmon mode */
snprintf(CiscoRFMON, sizeof(CiscoRFMON),DEFAULT_PATH, device);
CISCO_CONFIG_FILE = fopen(CiscoRFMON,"w");
fputs ("Mode: r",CISCO_CONFIG_FILE);
fputs ("Mode: y",CISCO_CONFIG_FILE);
fputs ("XmitPower: 1",CISCO_CONFIG_FILE);
fclose(CISCO_CONFIG_FILE);
}
else if (cardtype == CARD_TYPE_NG)
{
char wlanngcmd[62];
snprintf(wlanngcmd, sizeof(wlanngcmd),"%s %s lnxreq_wlansniff channel=1 enable=true",WLANCTL_PATH,device);
if (system (wlanngcmd) != 0)
{
printf ("\n Fatal error could not set %s in raw mode, check cardtype\n\n\tterminating now...\n\n",device);
exit(1);
}
}
else if (cardtype == CARD_TYPE_HOSTAP)
{
printf ("Got a host-ap card, nothing is implemented now\n");
}
/* Check the interface if it is in the correct raw mode */
handle = pcap_open_live(device, BUFSIZ, 1, 0, errbuf);
/* getting the datalink type */
datalink = pcap_datalink(handle);
if (datalink == DLT_IEEE802_11) /* Rawmode is IEEE802_11 */
{
printf ("Your successfully listen on %s in 802.11 raw mode\n",device);
pcap_close(handle);
return 0;
}
else
{
printf ("Fatal error, cannot continue, your interface %s does not work in the correct 802.11 raw mode, check you driver please\n\tterminating now",device);
pcap_close(handle);
exit(1);
}
}
int card_set_promisc_up (char * device)
{
int ret;
char ifconfigcmd[32];
snprintf(ifconfigcmd,sizeof(ifconfigcmd),SBIN_PATH, device);
ret = system (ifconfigcmd);
if (ret > 0)
{
printf ("\nFatal error, could not execute %s please check your card,binary location and permission\n",ifconfigcmd);
return 0;
}
return 1;
}
diff --git a/noncore/net/wellenreiter/daemon/source/cardmode.hh b/noncore/net/wellenreiter/daemon/source/cardmode.hh
index 87284a1..ecc97b1 100644
--- a/noncore/net/wellenreiter/daemon/source/cardmode.hh
+++ b/noncore/net/wellenreiter/daemon/source/cardmode.hh
@@ -1,36 +1,34 @@
/* $Id$ */
#ifndef CARDMODE_HH
#define CARDMODE_HH
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <pcap.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/bpf.h>
-#endif /* CARDMODE_HH */
-
/* Defines, used for the card setup */
#define DEFAULT_PATH "/proc/driver/aironet/%s/Config"
#define CARD_TYPE_CISCO 1
#define CARD_TYPE_NG 2
#define CARD_TYPE_HOSTAP 3
/* only for now, until we have the daemon running */
/*the config file should provide these information */
#define SNIFFER_DEVICE "wlan0"
#define CARD_TYPE CARD_TYPE_CISCO
#define SBIN_PATH "/sbin/ifconfig %s promisc up"
#define WLANCTL_PATH "/sbin/wlanctl-ng"
/* Prototypes */
int card_into_monitormode (char * device, int cardtype);
int card_set_promisc_up (char * device);
-
+#endif /* CARDMODE_HH */
diff --git a/noncore/net/wellenreiter/daemon/source/daemon.cc b/noncore/net/wellenreiter/daemon/source/daemon.cc
index b3a37b6..1f9e98a 100644
--- a/noncore/net/wellenreiter/daemon/source/daemon.cc
+++ b/noncore/net/wellenreiter/daemon/source/daemon.cc
@@ -1,81 +1,95 @@
/*
* Startup functions of wellenreiter
*
* $Id$
*/
#include "config.hh"
#include "daemon.hh"
+#include "cardmode.hh"
+#include "sniffer.hh"
/* Main function of wellenreiterd */
int main(int argc, char **argv)
{
- int sock, maxfd, guiport=GUIPORT;
- char guihost[]="127.0.0.1";
+ int sock, maxfd;
struct sockaddr_in *cliaddr;
socklen_t len=sizeof(struct sockaddr);
char buffer[128];
- FILE *fp=stdin; /* Will be replaced with sniffer */
+ pcap_t *handletopcap; /* The handle to the libpcap */
+ char errbuf[PCAP_ERRBUF_SIZE]; /* The errorbuffer of libpacap */
+ struct pcap_pkthdr header; /* The packet header from pcap*/
+ const u_char *packet; /* The actual packet content*/
+
fd_set rset;
fprintf(stderr, "wellenreiterd %s\n\n", VERSION);
+ /* will be replaced soon, just for max because max is lazy :-) */
+ if(card_into_monitormode (SNIFFER_DEVICE, CARD_TYPE_NG) < 0)
+ {
+ fprintf(stderr, "Cannot set card into mon mode, aborting\n");
+ exit(-1);
+ }
+
+ /* opening the pcap for sniffing */
+ handletopcap = pcap_open_live(SNIFFER_DEVICE, BUFSIZ, 1, 1000, errbuf);
+#ifdef HAVE_PCAP_NONBLOCK
+ pcap_setnonblock(handletopcap, 1, errstr);
+#endif
+
/* Setup socket for incoming commands */
if((sock=commsock(DAEMONADDR, DAEMONPORT)) < 0)
{
wl_logerr("Cannot setup socket");
exit(-1);
}
wl_loginfo("Set up socket '%d' for GUI communication", sock);
FD_ZERO(&rset);
/* Start main loop */
wl_loginfo("Starting main loop");
while(1)
{
FD_SET(sock, &rset);
- FD_SET(fileno(fp), &rset);
- maxfd=sock+fileno(fp)+1;
+ FD_SET(pcap_fileno(handletopcap), &rset);
+ maxfd=sock + pcap_fileno(handletopcap) + 1;
if(select(maxfd, &rset, NULL, NULL, NULL) < 0)
{
wl_logerr("Error calling select: %s", strerror(errno));
break;
}
/* Got data on local socket from GUI */
if(FD_ISSET(sock, &rset))
{
memset(buffer, 0, sizeof(buffer));
if(recvfrom(sock, buffer, sizeof(buffer)-1, 0, (struct sockaddr *)cliaddr, &len) < 0)
{
wl_logerr("Cannot read from socket: %s", strerror(errno));
break;
}
wl_loginfo("Received command from '%s': %s", inet_ntoa(cliaddr->sin_addr), buffer);
- /* Pass string to analyze function */
- // sendcomm(guihost, guiport, buffer);
+ /* will be passed to analyze function */
+ fprintf(stderr, "Received command: %s\n", buffer);
}
- /* Will be replaced with sniffer ... later */
- if(FD_ISSET(fileno(fp), &rset))
+ /* Pcap stuff */
+ if(FD_ISSET(pcap_fileno(handletopcap), &rset))
{
- memset(buffer, 0, sizeof(buffer));
- if(fgets(buffer, sizeof(buffer) - 1, fp) == NULL)
- {
- wl_logerr("Cannot read from stdin: %s", strerror(errno));
- break;
- }
- wl_loginfo("Sending command to '%s': %s", GUIADDR, buffer);
- /* Send string to GUI */
- sendcomm(guihost, guiport, "%d: %s", 1234, buffer);
+ /* Grab one single packet */
+ packet = pcap_next(handletopcap, &header);
+
+ /* process the packet */
+ process_packets(NULL,&header,*&packet);
}
}
close(sock);
exit(0);
}
diff --git a/noncore/net/wellenreiter/daemon/source/sniffer.cc b/noncore/net/wellenreiter/daemon/source/sniffer.cc
index be64d67..66d5b6f 100644
--- a/noncore/net/wellenreiter/daemon/source/sniffer.cc
+++ b/noncore/net/wellenreiter/daemon/source/sniffer.cc
@@ -1,347 +1,308 @@
/*
* rfmon mode sniffer
* This works only with cisco wireless cards with an rfmon
* able driver and not with wifi stuff.
*
* $Id$
*/
#include "config.hh"
#include "cardmode.hh"
#include "sniffer.hh"
#include "ieee802_11.hh"
#include "extract.hh"
-int main(void)
-{
- if(card_into_monitormode (SNIFFER_DEVICE, CARD_TYPE_NG) < 0)
- return 0;
- start_sniffing (SNIFFER_DEVICE);
-
- return 1;
-}
-
-int start_sniffing (char * device)
-{
-
- pcap_t *handletopcap; /* The handle to the libpcap */
- char errbuf[PCAP_ERRBUF_SIZE]; /* The errorbuffer of libpacap */
- struct pcap_pkthdr header; /* The packet header from pcap*/
- const u_char *packet; /* The actual packet content*/
-
- /* opening the pcap for sniffing */
- handletopcap = pcap_open_live(device, BUFSIZ, 1, 1000, errbuf);
-
- #ifdef HAVE_PCAP_NONBLOCK
- pcap_setnonblock(handletopcap, 1, errstr);
- #endif
- /*start scanning */
-// pcap_loop(handletopcap,-1,process_packets,NULL);
- /* Loope endless */
- while(1)
- {
- /* Grab one single packet */
- packet = pcap_next(handletopcap, &header);
-
- /* process the packet */
- process_packets(NULL,&header,*&packet);
- }
-
- printf("\nDone processing packets... wheew!\n");
- return 1;
-}
-
void process_packets(u_char *useless,const struct pcap_pkthdr* pkthdr,const u_char* packet)
{
u_int caplen = pkthdr->caplen;
u_int length = pkthdr->len;
u_int16_t fc;
u_int HEADER_LENGTH;
/* pinfo holds all interresting information for us */
struct packetinfo pinfo;
struct packetinfo *pinfoptr;
pinfoptr=&pinfo;
pinfoptr->isvalid = 0;
pinfoptr->pktlen = pkthdr->len;
if (caplen < IEEE802_11_FC_LEN)
{
/* This is a garbage packet, because is does not long enough
to hold a 802.11b header */
pinfoptr->isvalid = 0;
return;
}
/* Gets the framecontrol bits (2bytes long) */
fc = EXTRACT_LE_16BITS(packet);
HEADER_LENGTH = GetHeaderLength(fc);
if (caplen < HEADER_LENGTH)
{
/* This is a garbage packet, because it is not long enough
to hold a correct header of its type */
pinfoptr->isvalid = 0;
return;
}
/* Decode 802.11b header out of the packet */
if (decode_80211b_hdr(packet,pinfoptr) == 0)
{
/* Justification of the ofset to further process the packet */
length -= HEADER_LENGTH;
caplen -= HEADER_LENGTH;
packet += HEADER_LENGTH;
}
else
{ /* Something is wrong,could not be a correct packet */
return;
}
switch (FC_TYPE(fc))
{
/* Is it a managemnet frame? */
case T_MGMT:
switch (FC_SUBTYPE(fc))
{ /* Is it a beacon frame? */
case ST_BEACON:
if (handle_beacon(fc, packet,pinfoptr) ==0)
{
if (!strcmp(pinfoptr->desthwaddr,"ff:ff:ff:ff:ff:ff") == 0)
{
/* Every beacon must have the broadcast as destination
so it must be a shitti packet */
pinfoptr->isvalid = 0;
return;
}
if (pinfoptr->cap_ESS == pinfoptr->cap_IBSS)
{
/* Only one of both are possible, so must be
a noise packet, if this comes up */
pinfoptr->isvalid = 0;
return;
}
if (pinfoptr->channel < 1 || pinfoptr->channel > 14)
{
/* Only channels between 1 and 14 are possible
others must be noise packets */
pinfoptr->isvalid = 0;
return;
}
/* Here should be the infos to the gui issued */
if (pinfoptr->cap_ESS == 1 &&pinfoptr->cap_IBSS ==0)
{
printf ("\nHave found an accesspoint:");
}
else if(pinfoptr->cap_ESS == 0 && pinfoptr->cap_IBSS == 1)
{
printf ("\nHave found an AD-HOC station:");
}
if (strcmp (pinfoptr->ssid,NONBROADCASTING) ==0)
{
printf ("\n\tOn a non-broadcasting network");
}
else
{
printf ("\n\tOn network : %s",pinfoptr->ssid);
}
printf ("\n\tLen SSID : %d",pinfoptr->ssid_len);
printf ("\n\tOn Channel : %d",pinfoptr->channel);
printf ("\n\tEncryption : %s", pinfoptr->cap_WEP ? "ON" : "OFF");
printf ("\n\tMacaddress : %s",pinfoptr->sndhwaddr);
printf ("\n\tBssid : %s",pinfoptr->bssid);
printf ("\n\tDest : %s\n",pinfoptr->desthwaddr);
}
break;
default:
printf("Unknown IEEE802.11 frame subtype (%d)",FC_SUBTYPE(fc));
break;
} /* End of switch over different mgt frame types */
break;
case T_CTRL:
// decode_control_frames(fc, packet);
printf ("Its a control frame");
break;
case T_DATA:
// decode_data_frames(fc, packet);
printf ("Its a date frame");
break;
default:
printf("Unknown IEEE802.11 frame type (%d)",FC_TYPE(fc));
break;
}
}
/* This decodes the 802.11b frame header out of the 802.11b packet
all the infos is placed into the packetinfo structure */
int decode_80211b_hdr(const u_char *p,struct packetinfo *ppinfo)
{
const struct mgmt_header_t *mgthdr = (const struct mgmt_header_t *) p;
ppinfo->fcsubtype = FC_SUBTYPE(mgthdr->fc);
/* Get the sender, bssid and dest mac address */
etheraddr_string(mgthdr->bssid,ppinfo->bssid);
etheraddr_string(mgthdr->da,ppinfo->desthwaddr);
etheraddr_string(mgthdr->sa,ppinfo->sndhwaddr);
ppinfo->fc_wep = FC_WEP(mgthdr->fc);
return 0;
}
void etheraddr_string(register const u_char *ep,char * text)
{
static char hex[] = "0123456789abcdef";
register u_int i, j;
register char *cp;
char buf[sizeof("00:00:00:00:00:00")];
cp = buf;
if ((j = *ep >> 4) != 0)
*cp++ = hex[j];
*cp++ = hex[*ep++ & 0xf];
for (i = 5; (int)--i >= 0;) {
*cp++ = ':';
if ((j = *ep >> 4) != 0)
*cp++ = hex[j];
*cp++ = hex[*ep++ & 0xf];
}
*cp = '\0';
strcpy(text,buf);
}
int handle_beacon(u_int16_t fc, const u_char *p,struct packetinfo *ppinfo)
{
struct mgmt_body_t pbody;
int offset = 0;
/* Get the static informations out of the packet */
memset(&pbody, 0, sizeof(pbody));
memcpy(&pbody.timestamp, p, 8);
offset += 8;
pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset);
offset += 2;
pbody.capability_info = EXTRACT_LE_16BITS(p+offset);
offset += 2;
/* Gets the different flags out of the capabilities */
ppinfo->cap_ESS = CAPABILITY_ESS(pbody.capability_info);
ppinfo->cap_IBSS = CAPABILITY_IBSS(pbody.capability_info);
ppinfo->cap_WEP = CAPABILITY_PRIVACY(pbody.capability_info);
/* Gets the tagged elements out of the packets */
while (offset + 1 < ppinfo->pktlen)
{
switch (*(p + offset))
{
case E_SSID:
memcpy(&(pbody.ssid),p+offset,2); offset += 2;
if (pbody.ssid.length > 0)
{
memcpy(&(pbody.ssid.ssid),p+offset,pbody.ssid.length); offset += pbody.ssid.length;
pbody.ssid.ssid[pbody.ssid.length]='\0';
if (strcmp((char *)pbody.ssid.ssid,"")==0)
{
ppinfo->ssid = NONBROADCASTING;
}
else
{
ppinfo->ssid = (char *)pbody.ssid.ssid;
}
ppinfo->ssid_len = pbody.ssid.length;
}
break;
case E_CHALLENGE:
memcpy(&(pbody.challenge),p+offset,2); offset += 2;
if (pbody.challenge.length > 0)
{
memcpy(&(pbody.challenge.text),p+offset,pbody.challenge.length); offset += pbody.challenge.length;
pbody.challenge.text[pbody.challenge.length]='\0';
}
break;
case E_RATES:
memcpy(&(pbody.rates),p+offset,2); offset += 2;
if (pbody.rates.length > 0) {
memcpy(&(pbody.rates.rate),p+offset,pbody.rates.length); offset += pbody.rates.length;
}
break;
case E_DS:
memcpy(&(pbody.ds),p+offset,3); offset +=3;
ppinfo->channel = pbody.ds.channel;
break;
case E_CF:
memcpy(&(pbody.cf),p+offset,8); offset +=8;
break;
case E_TIM:
memcpy(&(pbody.tim),p+offset,2); offset +=2;
memcpy(&(pbody.tim.count),p+offset,3); offset +=3;
if ((pbody.tim.length -3) > 0)
{
memcpy((pbody.tim.bitmap),p+(pbody.tim.length -3),(pbody.tim.length -3));
offset += pbody.tim.length -3;
}
break;
default:
offset+= *(p+offset+1) + 2;
break;
} /* end of switch*/
} /* end of for loop */
return 0;
} /* End of handle_beacon */
-static int GetHeaderLength(u_int16_t fc)
+int GetHeaderLength(u_int16_t fc)
{
int iLength=0;
switch (FC_TYPE(fc)) {
case T_MGMT:
iLength = MGMT_HEADER_LEN;
break;
case T_CTRL:
switch (FC_SUBTYPE(fc)) {
case CTRL_PS_POLL:
iLength = CTRL_PS_POLL_LEN;
break;
case CTRL_RTS:
iLength = CTRL_RTS_LEN;
break;
case CTRL_CTS:
iLength = CTRL_CTS_LEN;
break;
case CTRL_ACK:
iLength = CTRL_ACK_LEN;
break;
case CTRL_CF_END:
iLength = CTRL_END_LEN;
break;
case CTRL_END_ACK:
iLength = CTRL_END_ACK_LEN;
break;
default:
iLength = 0;
break;
}
break;
case T_DATA:
if (FC_TO_DS(fc) && FC_FROM_DS(fc))
iLength = 30;
else
iLength = 24;
break;
default:
printf("unknown IEEE802.11 frame type (%d)",
FC_TYPE(fc));
break;
}
return iLength;
}
diff --git a/noncore/net/wellenreiter/daemon/source/sniffer.hh b/noncore/net/wellenreiter/daemon/source/sniffer.hh
index d262353..7e1e3be 100644
--- a/noncore/net/wellenreiter/daemon/source/sniffer.hh
+++ b/noncore/net/wellenreiter/daemon/source/sniffer.hh
@@ -1,70 +1,64 @@
/* $Id$ */
#ifndef SNIFFER_HH
#define SNIFFER_HH
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <pcap.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/bpf.h>
-
#define NONBROADCASTING "non-broadcasting"
-
/* holds all the interresting data */
struct packetinfo
{
int isvalid;
int pktlen;
int fctype;
int fcsubtype;
int fc_wep;
int cap_WEP;
int cap_IBSS;
int cap_ESS;
int channel;
char bssid[sizeof("00:00:00:00:00:00")];
char desthwaddr[sizeof("00:00:00:00:00:00")];
char sndhwaddr[sizeof("00:00:00:00:00:00")];
char *ssid;
int ssid_len;
};
-
-/* Prototypes */
-int sniffer(void);
-int start_sniffing (char * device);
void process_packets(u_char *useless,const struct pcap_pkthdr* pkthdr,const u_char* packet);
int decode_80211b_hdr(const u_char *p,struct packetinfo *ppinfo);
void etheraddr_string(register const u_char *ep,char * text);
int handle_beacon(u_int16_t fc, const u_char *p,struct packetinfo *ppinfo);
-static int GetHeaderLength(u_int16_t fc);
+int GetHeaderLength(u_int16_t fc);
/*
* True if "l" bytes of "var" were captured.
*
* The "snapend - (l) <= snapend" checks to make sure "l" isn't so large
* that "snapend - (l)" underflows.
*
* The check is for <= rather than < because "l" might be 0.
*/
#define TTEST2(var, l) (snapend - (l) <= snapend && \
(const u_char *)&(var) <= snapend - (l))
/* True if "var" was captured */
#define TTEST(var) TTEST2(var, sizeof(var))
/* Bail if "l" bytes of "var" were not captured */
#define TCHECK2(var, l) if (!TTEST2(var, l)) goto trunc
/* Bail if "var" was not captured */
#define TCHECK(var) TCHECK2(var, sizeof(var))
#endif /* SNIFFER_HH */