/
cap2hccapx.c
executable file
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/
cap2hccapx.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <search.h>
#include <errno.h>
#include <inttypes.h>
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define BIG_ENDIAN_HOST
#endif
#if defined (_WIN32) || defined (_WIN64)
typedef unsigned int lsearch_cnt_t;
#else
typedef size_t lsearch_cnt_t;
#endif
#pragma pack(1)
/**
* Name........: cap2hccapx.c
* Autor.......: Jens Steube <jens.steube@gmail.com>, Philipp "philsmd" Schmidt <philsmd@hashcat.net>
* License.....: MIT
*/
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
// from pcap.h
#define TCPDUMP_MAGIC 0xa1b2c3d4
#define TCPDUMP_CIGAM 0xd4c3b2a1
#define TCPDUMP_DECODE_LEN 65535
#define DLT_NULL 0 /* BSD loopback encapsulation */
#define DLT_EN10MB 1 /* Ethernet (10Mb) */
#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
#define DLT_AX25 3 /* Amateur Radio AX.25 */
#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
#define DLT_CHAOS 5 /* Chaos */
#define DLT_IEEE802 6 /* IEEE 802 Networks */
#define DLT_ARCNET 7 /* ARCNET, with BSD-style header */
#define DLT_SLIP 8 /* Serial Line IP */
#define DLT_PPP 9 /* Point-to-point Protocol */
#define DLT_FDDI 10 /* FDDI */
#define DLT_RAW 12 /* Raw headers (no link layer) */
#define DLT_RAW2 14
#define DLT_RAW3 101
#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
#define DLT_IEEE802_11_PRISM 119
#define DLT_IEEE802_11_RADIO 127
#define DLT_IEEE802_11_PPI_HDR 192
struct pcap_file_header {
u32 magic;
u16 version_major;
u16 version_minor;
u32 thiszone; /* gmt to local correction */
u32 sigfigs; /* accuracy of timestamps */
u32 snaplen; /* max length saved portion of each pkt */
u32 linktype; /* data link type (LINKTYPE_*) */
};
struct pcap_pkthdr {
u32 tv_sec; /* timestamp seconds */
u32 tv_usec; /* timestamp microseconds */
u32 caplen; /* length of portion present */
u32 len; /* length this packet (off wire) */
};
typedef struct pcap_file_header pcap_file_header_t;
typedef struct pcap_pkthdr pcap_pkthdr_t;
// from linux/ieee80211.h
struct ieee80211_hdr_3addr {
u16 frame_control;
u16 duration_id;
u8 addr1[6];
u8 addr2[6];
u8 addr3[6];
u16 seq_ctrl;
} __attribute__((packed));
struct ieee80211_qos_hdr {
u16 frame_control;
u16 duration_id;
u8 addr1[6];
u8 addr2[6];
u8 addr3[6];
u16 seq_ctrl;
u16 qos_ctrl;
} __attribute__((packed));
typedef struct ieee80211_hdr_3addr ieee80211_hdr_3addr_t;
typedef struct ieee80211_qos_hdr ieee80211_qos_hdr_t;
struct ieee80211_llc_snap_header
{
/* LLC part: */
u8 dsap; /**< Destination SAP ID */
u8 ssap; /**< Source SAP ID */
u8 ctrl; /**< Control information */
/* SNAP part: */
u8 oui[3]; /**< Organization code, usually 0 */
u16 ethertype; /**< Ethernet Type field */
} __attribute__((packed));
typedef struct ieee80211_llc_snap_header ieee80211_llc_snap_header_t;
#define IEEE80211_FCTL_FTYPE 0x000c
#define IEEE80211_FCTL_STYPE 0x00f0
#define IEEE80211_FCTL_TODS 0x0100
#define IEEE80211_FCTL_FROMDS 0x0200
#define IEEE80211_FTYPE_MGMT 0x0000
#define IEEE80211_FTYPE_DATA 0x0008
#define IEEE80211_STYPE_ASSOC_REQ 0x0000
#define IEEE80211_STYPE_ASSOC_RESP 0x0010
#define IEEE80211_STYPE_REASSOC_REQ 0x0020
#define IEEE80211_STYPE_REASSOC_RESP 0x0030
#define IEEE80211_STYPE_PROBE_REQ 0x0040
#define IEEE80211_STYPE_PROBE_RESP 0x0050
#define IEEE80211_STYPE_BEACON 0x0080
#define IEEE80211_STYPE_QOS_DATA 0x0080
#define IEEE80211_STYPE_ATIM 0x0090
#define IEEE80211_STYPE_DISASSOC 0x00A0
#define IEEE80211_STYPE_AUTH 0x00B0
#define IEEE80211_STYPE_DEAUTH 0x00C0
#define IEEE80211_STYPE_ACTION 0x00D0
#define IEEE80211_LLC_DSAP 0xAA
#define IEEE80211_LLC_SSAP 0xAA
#define IEEE80211_LLC_CTRL 0x03
#define IEEE80211_DOT1X_AUTHENTICATION 0x8E88
/* Management Frame Information Element Types */
#define MFIE_TYPE_SSID 0
#define MFIE_TYPE_RATES 1
#define MFIE_TYPE_FH_SET 2
#define MFIE_TYPE_DS_SET 3
#define MFIE_TYPE_CF_SET 4
#define MFIE_TYPE_TIM 5
#define MFIE_TYPE_IBSS_SET 6
#define MFIE_TYPE_CHALLENGE 16
#define MFIE_TYPE_ERP 42
#define MFIE_TYPE_RSN 48
#define MFIE_TYPE_RATES_EX 50
#define MFIE_TYPE_GENERIC 221
// from ks7010/eap_packet.h
#define WBIT(n) (1 << (n))
#define WPA_KEY_INFO_TYPE_MASK (WBIT(0) | WBIT(1) | WBIT(2))
#define WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 WBIT(0)
#define WPA_KEY_INFO_TYPE_HMAC_SHA1_AES WBIT(1)
#define WPA_KEY_INFO_KEY_TYPE WBIT(3) /* 1 = Pairwise, 0 = Group key */
#define WPA_KEY_INFO_KEY_INDEX_MASK (WBIT(4) | WBIT(5))
#define WPA_KEY_INFO_KEY_INDEX_SHIFT 4
#define WPA_KEY_INFO_INSTALL WBIT(6) /* pairwise */
#define WPA_KEY_INFO_TXRX WBIT(6) /* group */
#define WPA_KEY_INFO_ACK WBIT(7)
#define WPA_KEY_INFO_MIC WBIT(8)
#define WPA_KEY_INFO_SECURE WBIT(9)
#define WPA_KEY_INFO_ERROR WBIT(10)
#define WPA_KEY_INFO_REQUEST WBIT(11)
#define WPA_KEY_INFO_ENCR_KEY_DATA WBIT(12) /* IEEE 802.11i/RSN only */
// radiotap header from http://www.radiotap.org/
struct ieee80211_radiotap_header
{
u8 it_version; /* set to 0 */
u8 it_pad;
u16 it_len; /* entire length */
u32 it_present; /* fields present */
} __attribute__((packed));
typedef struct ieee80211_radiotap_header ieee80211_radiotap_header_t;
// prism header
#define WLAN_DEVNAMELEN_MAX 16
struct prism_item
{
u32 did;
u16 status;
u16 len;
u32 data;
} __attribute__((packed));
struct prism_header
{
u32 msgcode;
u32 msglen;
char devname[WLAN_DEVNAMELEN_MAX];
struct prism_item hosttime;
struct prism_item mactime;
struct prism_item channel;
struct prism_item rssi;
struct prism_item sq;
struct prism_item signal;
struct prism_item noise;
struct prism_item rate;
struct prism_item istx;
struct prism_item frmlen;
} __attribute__((packed));
typedef struct prism_item prism_item_t;
typedef struct prism_header prism_header_t;
/* CACE PPI headers */
struct ppi_packet_header
{
uint8_t pph_version;
uint8_t pph_flags;
uint16_t pph_len;
uint32_t pph_dlt;
} __attribute__((packed));
typedef struct ppi_packet_header ppi_packet_header_t;
struct ppi_field_header
{
uint16_t pfh_datatype;
uint16_t pfh_datalen;
} __attribute__((__packed__));
typedef struct ppi_field_header ppi_field_header_t;
#define PPI_FIELD_11COMMON 2
#define PPI_FIELD_11NMAC 3
#define PPI_FIELD_11NMACPHY 4
#define PPI_FIELD_SPECMAP 5
#define PPI_FIELD_PROCINFO 6
#define PPI_FIELD_CAPINFO 7
// own structs
struct beaconinfo
{
u64 beacon_timestamp;
u16 beacon_interval;
u16 beacon_capabilities;
} __attribute__((packed));
typedef struct beaconinfo beacon_t;
struct associationreqf
{
u16 client_capabilities;
u16 client_listeninterval;
} __attribute__((packed));
typedef struct associationreqf assocreq_t;
struct reassociationreqf
{
u16 client_capabilities;
u16 client_listeninterval;
u8 addr[6];
} __attribute__((packed));
typedef struct reassociationreqf reassocreq_t;
struct auth_packet
{
u8 version;
u8 type;
u16 length;
u8 key_descriptor;
u16 key_information;
u16 key_length;
u64 replay_counter;
u8 wpa_key_nonce[32];
u8 wpa_key_iv[16];
u8 wpa_key_rsc[8];
u8 wpa_key_id[8];
u8 wpa_key_mic[16];
u16 wpa_key_data_length;
} __attribute__((packed));
typedef struct auth_packet auth_packet_t;
#define MAX_ESSID_LEN 32
typedef enum
{
ESSID_SOURCE_USER = 1,
ESSID_SOURCE_REASSOC = 2,
ESSID_SOURCE_ASSOC = 3,
ESSID_SOURCE_PROBE = 4,
ESSID_SOURCE_DIRECTED_PROBE = 5,
ESSID_SOURCE_BEACON = 6,
} essid_source_t;
typedef struct
{
u8 bssid[6];
char essid[MAX_ESSID_LEN + 4];
int essid_len;
int essid_source;
} essid_t;
#define EAPOL_TTL 1
#define TEST_REPLAYCOUNT 0
typedef enum
{
EXC_PKT_NUM_1 = 1,
EXC_PKT_NUM_2 = 2,
EXC_PKT_NUM_3 = 3,
EXC_PKT_NUM_4 = 4,
} exc_pkt_num_t;
typedef enum
{
MESSAGE_PAIR_M12E2 = 0,
MESSAGE_PAIR_M14E4 = 1,
MESSAGE_PAIR_M32E2 = 2,
MESSAGE_PAIR_M32E3 = 3,
MESSAGE_PAIR_M34E3 = 4,
MESSAGE_PAIR_M34E4 = 5,
} message_pair_t;
#define BROADCAST_MAC "\xff\xff\xff\xff\xff\xff"
typedef struct
{
int excpkt_num;
u32 tv_sec;
u32 tv_usec;
u64 replay_counter;
u8 mac_ap[6];
u8 mac_sta[6];
u8 nonce[32];
u16 eapol_len;
u8 eapol[256];
u8 keyver;
u8 keymic[16];
} excpkt_t;
// databases
#define DB_ESSID_MAX 50000
#define DB_EXCPKT_MAX 100000
essid_t *essids = NULL;
lsearch_cnt_t essids_cnt = 0;
excpkt_t *excpkts = NULL;
lsearch_cnt_t excpkts_cnt = 0;
// output
#define HCCAPX_VERSION 4
#define HCCAPX_SIGNATURE 0x58504348 // HCPX
struct hccapx
{
u32 signature;
u32 version;
u8 message_pair;
u8 essid_len;
u8 essid[32];
u8 keyver;
u8 keymic[16];
u8 mac_ap[6];
u8 nonce_ap[32];
u8 mac_sta[6];
u8 nonce_sta[32];
u16 eapol_len;
u8 eapol[256];
} __attribute__((packed));
typedef struct hccapx hccapx_t;
// functions
static u8 hex_convert (const u8 c)
{
return (c & 15) + (c >> 6) * 9;
}
static u8 hex_to_u8 (const u8 hex[2])
{
u8 v = 0;
v |= ((u8) hex_convert (hex[1]) << 0);
v |= ((u8) hex_convert (hex[0]) << 4);
return (v);
}
static u16 byte_swap_16 (const u16 n)
{
return (n & 0xff00) >> 8
| (n & 0x00ff) << 8;
}
static u32 byte_swap_32 (const u32 n)
{
return (n & 0xff000000) >> 24
| (n & 0x00ff0000) >> 8
| (n & 0x0000ff00) << 8
| (n & 0x000000ff) << 24;
}
static u64 byte_swap_64 (const u64 n)
{
return (n & 0xff00000000000000ULL) >> 56
| (n & 0x00ff000000000000ULL) >> 40
| (n & 0x0000ff0000000000ULL) >> 24
| (n & 0x000000ff00000000ULL) >> 8
| (n & 0x00000000ff000000ULL) << 8
| (n & 0x0000000000ff0000ULL) << 24
| (n & 0x000000000000ff00ULL) << 40
| (n & 0x00000000000000ffULL) << 56;
}
int comp_excpkt (const void *p1, const void *p2)
{
excpkt_t *e1 = (excpkt_t *) p1;
excpkt_t *e2 = (excpkt_t *) p2;
const int excpkt_diff = e1->excpkt_num - e2->excpkt_num;
if (excpkt_diff != 0) return excpkt_diff;
const int rc_nonce = memcmp (e1->nonce, e2->nonce, 32);
if (rc_nonce != 0) return rc_nonce;
const int rc_mac_ap = memcmp (e1->mac_ap, e2->mac_ap, 6);
if (rc_mac_ap != 0) return rc_mac_ap;
const int rc_mac_sta = memcmp (e1->mac_sta, e2->mac_sta, 6);
if (rc_mac_sta != 0) return rc_mac_sta;
if (e1->replay_counter < e2->replay_counter) return 1;
if (e1->replay_counter > e2->replay_counter) return -1;
return 0;
}
int comp_bssid (const void *p1, const void *p2)
{
essid_t *e1 = (essid_t *) p1;
essid_t *e2 = (essid_t *) p2;
return memcmp (e1->bssid, e2->bssid, 6);
}
static void db_excpkt_add (excpkt_t *excpkt, const u32 tv_sec, const u32 tv_usec, const u8 mac_ap[6], const u8 mac_sta[6])
{
if (essids_cnt == DB_EXCPKT_MAX)
{
fprintf (stderr, "Too many excpkt in dumpfile, aborting...\n");
exit (-1);
}
excpkt->tv_sec = tv_sec;
excpkt->tv_usec = tv_usec;
memcpy (excpkt->mac_ap, mac_ap, 6);
memcpy (excpkt->mac_sta, mac_sta, 6);
lsearch (excpkt, excpkts, &excpkts_cnt, sizeof (excpkt_t), comp_excpkt);
}
static void db_essid_add (essid_t *essid, const u8 addr3[6], const int essid_source)
{
if (essids_cnt == DB_ESSID_MAX)
{
fprintf (stderr, "Too many essid in dumpfile, aborting...\n");
exit (-1);
}
if (essid->essid_len == 0) return;
if (essid->essid[0] == 0) return;
memcpy (essid->bssid, addr3, 6);
void *ptr = lfind (essid, essids, &essids_cnt, sizeof (essid_t), comp_bssid);
if (ptr == NULL)
{
essid->essid_source = essid_source;
lsearch (essid, essids, &essids_cnt, sizeof (essid_t), comp_bssid);
}
else
{
essid_t *essid_old = (essid_t *) ptr;
if (essid_source > essid_old->essid_source)
{
memcpy (essid_old, essid, sizeof (essid_t));
essid_old->essid_source = essid_source;
}
}
}
static int handle_llc (const ieee80211_llc_snap_header_t *ieee80211_llc_snap_header)
{
if (ieee80211_llc_snap_header->dsap != IEEE80211_LLC_DSAP) return -1;
if (ieee80211_llc_snap_header->ssap != IEEE80211_LLC_SSAP) return -1;
if (ieee80211_llc_snap_header->ctrl != IEEE80211_LLC_CTRL) return -1;
if (ieee80211_llc_snap_header->ethertype != IEEE80211_DOT1X_AUTHENTICATION) return -1;
return 0;
}
static int handle_auth (const auth_packet_t *auth_packet, const int pkt_offset, const int pkt_size, excpkt_t *excpkt)
{
const u16 ap_length = byte_swap_16 (auth_packet->length);
const u16 ap_key_information = byte_swap_16 (auth_packet->key_information);
const u64 ap_replay_counter = byte_swap_64 (auth_packet->replay_counter);
const u16 ap_wpa_key_data_length = byte_swap_16 (auth_packet->wpa_key_data_length);
if (ap_length == 0) return -1;
// determine handshake exchange number
int excpkt_num = 0;
if (ap_key_information & WPA_KEY_INFO_ACK)
{
if (ap_key_information & WPA_KEY_INFO_INSTALL)
{
excpkt_num = EXC_PKT_NUM_3;
}
else
{
excpkt_num = EXC_PKT_NUM_1;
}
}
else
{
if (ap_key_information & WPA_KEY_INFO_SECURE)
{
excpkt_num = EXC_PKT_NUM_4;
}
else
{
excpkt_num = EXC_PKT_NUM_2;
}
}
// we're only interested in packets carrying a nonce
char zero[32] = { 0 };
if (memcmp (auth_packet->wpa_key_nonce, zero, 32) == 0) return -1;
// copy data
memcpy (excpkt->nonce, auth_packet->wpa_key_nonce, 32);
excpkt->replay_counter = ap_replay_counter;
excpkt->excpkt_num = excpkt_num;
excpkt->eapol_len = sizeof (auth_packet_t) + ap_wpa_key_data_length;
if ((pkt_offset + excpkt->eapol_len) > pkt_size) return -1;
if ((sizeof (auth_packet_t) + ap_wpa_key_data_length) > sizeof (excpkt->eapol)) return -1;
// we need to copy the auth_packet_t but have to clear the keymic
auth_packet_t auth_packet_orig;
memcpy (&auth_packet_orig, auth_packet, sizeof (auth_packet_t));
#ifdef BIG_ENDIAN_HOST
auth_packet_orig.length = byte_swap_16 (auth_packet_orig.length);
auth_packet_orig.key_information = byte_swap_16 (auth_packet_orig.key_information);
auth_packet_orig.key_length = byte_swap_16 (auth_packet_orig.key_length);
auth_packet_orig.replay_counter = byte_swap_64 (auth_packet_orig.replay_counter);
auth_packet_orig.wpa_key_data_length = byte_swap_16 (auth_packet_orig.wpa_key_data_length);
#endif
memset (auth_packet_orig.wpa_key_mic, 0, 16);
memcpy (excpkt->eapol, &auth_packet_orig, sizeof (auth_packet_t));
memcpy (excpkt->eapol + sizeof (auth_packet_t), auth_packet + 1, ap_wpa_key_data_length);
memcpy (excpkt->keymic, auth_packet->wpa_key_mic, 16);
excpkt->keyver = ap_key_information & WPA_KEY_INFO_TYPE_MASK;
if ((excpkt_num == EXC_PKT_NUM_3) || (excpkt_num == EXC_PKT_NUM_4))
{
excpkt->replay_counter--;
}
return 0;
}
static int get_essid_from_user (char *s, essid_t *essid)
{
char *man_essid = s;
char *man_bssid = strchr (man_essid, ':');
if (man_bssid == NULL)
{
fprintf (stderr, "Invalid format (%s), should be: MyESSID:d110391a58ac\n", s);
return -1;
}
*man_bssid = 0;
man_bssid++;
if (strlen (man_essid) >= 32)
{
fprintf (stderr, "Invalid format (%s), essid is too long\n", s);
return -1;
}
if (strlen (man_bssid) != 12)
{
fprintf (stderr, "Invalid format (%s), bssid must have length 12\n", s);
return -1;
}
strncpy (essid->essid, man_essid, 32);
essid->essid_len = strlen (essid->essid);
u8 bssid[6];
bssid[0] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
bssid[1] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
bssid[2] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
bssid[3] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
bssid[4] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
bssid[5] = hex_to_u8 ((u8 *) man_bssid); man_bssid += 2;
db_essid_add (essid, bssid, ESSID_SOURCE_USER);
return 0;
}
static int get_essid_from_tag (const u8 *packet, const pcap_pkthdr_t *header, u32 length_skip, essid_t *essid)
{
if (length_skip > header->caplen) return -1;
u32 length = header->caplen - length_skip;
const u8 *beacon = packet + length_skip;
const u8 *cur = beacon;
const u8 *end = beacon + length;
while (cur < end)
{
if ((cur + 2) >= end) break;
u8 tagtype = *cur++;
u8 taglen = *cur++;
if ((cur + taglen) >= end) break;
if (tagtype == MFIE_TYPE_SSID)
{
if (taglen < MAX_ESSID_LEN)
{
memcpy (essid->essid, cur, taglen);
essid->essid_len = taglen;
return 0;
}
}
cur += taglen;
}
return -1;
}
static void process_packet (const u8 *packet, const pcap_pkthdr_t *header)
{
if (header->caplen < sizeof (ieee80211_hdr_3addr_t)) return;
// our first header: ieee80211
ieee80211_hdr_3addr_t *ieee80211_hdr_3addr = (ieee80211_hdr_3addr_t *) packet;
#ifdef BIG_ENDIAN_HOST
ieee80211_hdr_3addr->frame_control = byte_swap_16 (ieee80211_hdr_3addr->frame_control);
ieee80211_hdr_3addr->duration_id = byte_swap_16 (ieee80211_hdr_3addr->duration_id);
ieee80211_hdr_3addr->seq_ctrl = byte_swap_16 (ieee80211_hdr_3addr->seq_ctrl);
#endif
const u16 frame_control = ieee80211_hdr_3addr->frame_control;
if ((frame_control & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)
{
if (memcmp (ieee80211_hdr_3addr->addr3, BROADCAST_MAC, 6) == 0) return;
essid_t essid;
memset (&essid, 0, sizeof (essid_t));
const int stype = frame_control & IEEE80211_FCTL_STYPE;
if (stype == IEEE80211_STYPE_BEACON)
{
const u32 length_skip = sizeof (ieee80211_hdr_3addr_t) + sizeof (beacon_t);
const int rc_beacon = get_essid_from_tag (packet, header, length_skip, &essid);
if (rc_beacon == -1) return;
db_essid_add (&essid, ieee80211_hdr_3addr->addr3, ESSID_SOURCE_BEACON);
}
else if (stype == IEEE80211_STYPE_PROBE_REQ)
{
const u32 length_skip = sizeof (ieee80211_hdr_3addr_t);
const int rc_beacon = get_essid_from_tag (packet, header, length_skip, &essid);
if (rc_beacon == -1) return;
db_essid_add (&essid, ieee80211_hdr_3addr->addr3, ESSID_SOURCE_PROBE);
}
else if (stype == IEEE80211_STYPE_PROBE_RESP)
{
const u32 length_skip = sizeof (ieee80211_hdr_3addr_t) + sizeof (beacon_t);
const int rc_beacon = get_essid_from_tag (packet, header, length_skip, &essid);
if (rc_beacon == -1) return;
db_essid_add (&essid, ieee80211_hdr_3addr->addr3, ESSID_SOURCE_PROBE);
}
else if (stype == IEEE80211_STYPE_ASSOC_REQ)
{
const u32 length_skip = sizeof (ieee80211_hdr_3addr_t) + sizeof (assocreq_t);
const int rc_beacon = get_essid_from_tag (packet, header, length_skip, &essid);
if (rc_beacon == -1) return;
db_essid_add (&essid, ieee80211_hdr_3addr->addr3, ESSID_SOURCE_ASSOC);
}
else if (stype == IEEE80211_STYPE_REASSOC_REQ)
{
const u32 length_skip = sizeof (ieee80211_hdr_3addr_t) + sizeof (reassocreq_t);
const int rc_beacon = get_essid_from_tag (packet, header, length_skip, &essid);
if (rc_beacon == -1) return;
db_essid_add (&essid, ieee80211_hdr_3addr->addr3, ESSID_SOURCE_REASSOC);
}
}
else if ((frame_control & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
{
// process header: ieee80211
int addr4_exist = ((frame_control & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS));
// find offset to llc/snap header
int llc_offset;
if ((frame_control & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_QOS_DATA)
{
llc_offset = sizeof (ieee80211_qos_hdr_t);
}
else
{
llc_offset = sizeof (ieee80211_hdr_3addr_t);
}
// process header: the llc/snap header
if (header->caplen < (llc_offset + sizeof (ieee80211_llc_snap_header_t))) return;
if (addr4_exist) llc_offset += 6;
ieee80211_llc_snap_header_t *ieee80211_llc_snap_header = (ieee80211_llc_snap_header_t *) &packet[llc_offset];
#ifdef BIG_ENDIAN_HOST
ieee80211_llc_snap_header->ethertype = byte_swap_16 (ieee80211_llc_snap_header->ethertype);
#endif
const int rc_llc = handle_llc (ieee80211_llc_snap_header);
if (rc_llc == -1) return;
// process header: the auth header
const int auth_offset = llc_offset + sizeof (ieee80211_llc_snap_header_t);
if (header->caplen < (auth_offset + sizeof (auth_packet_t))) return;
auth_packet_t *auth_packet = (auth_packet_t *) &packet[auth_offset];
#ifdef BIG_ENDIAN_HOST
auth_packet->length = byte_swap_16 (auth_packet->length);
auth_packet->key_information = byte_swap_16 (auth_packet->key_information);
auth_packet->key_length = byte_swap_16 (auth_packet->key_length);
auth_packet->replay_counter = byte_swap_64 (auth_packet->replay_counter);
auth_packet->wpa_key_data_length = byte_swap_16 (auth_packet->wpa_key_data_length);
#endif
excpkt_t excpkt;
memset (&excpkt, 0, sizeof (excpkt_t));
const int rc_auth = handle_auth (auth_packet, auth_offset, header->caplen, &excpkt);
if (rc_auth == -1) return;
if ((excpkt.excpkt_num == EXC_PKT_NUM_1) || (excpkt.excpkt_num == EXC_PKT_NUM_3))
{
db_excpkt_add (&excpkt, header->tv_sec, header->tv_usec, ieee80211_hdr_3addr->addr2, ieee80211_hdr_3addr->addr1);
}
else if ((excpkt.excpkt_num == EXC_PKT_NUM_2) || (excpkt.excpkt_num == EXC_PKT_NUM_4))
{
db_excpkt_add (&excpkt, header->tv_sec, header->tv_usec, ieee80211_hdr_3addr->addr1, ieee80211_hdr_3addr->addr2);
}
}
}
int main (int argc, char *argv[])
{
if ((argc != 3) && (argc != 4) && (argc != 5))
{
fprintf (stderr, "usage: %s input.pcap output.hccapx [filter by essid] [additional network essid:bssid]\n", argv[0]);
return -1;
}
char *in = argv[1];
char *out = argv[2];
char *essid_filter = NULL;
if (argc >= 4) essid_filter = argv[3];
// database initializations
essids = (essid_t *) calloc (DB_ESSID_MAX, sizeof (essid_t));
essids_cnt = 0;
excpkts = (excpkt_t *) calloc (DB_EXCPKT_MAX, sizeof (excpkt_t));
excpkts_cnt = 0;
// manual beacon
if (argc >= 5)
{
essid_t essid;
memset (&essid, 0, sizeof (essid_t));
const int rc = get_essid_from_user (argv[4], &essid);
if (rc == -1) return -1;
}
// start with pcap handling
FILE *pcap = fopen (in, "rb");
if (pcap == NULL)
{
fprintf (stderr, "%s: %s\n", in, strerror (errno));
return -1;
}
// check pcap header
pcap_file_header_t pcap_file_header;
const int nread = fread (&pcap_file_header, sizeof (pcap_file_header_t), 1, pcap);
if (nread != 1)
{
fprintf (stderr, "%s: Could not read pcap header\n", in);
return -1;
}
#ifdef BIG_ENDIAN_HOST
pcap_file_header.magic = byte_swap_32 (pcap_file_header.magic);
pcap_file_header.version_major = byte_swap_16 (pcap_file_header.version_major);
pcap_file_header.version_minor = byte_swap_16 (pcap_file_header.version_minor);
pcap_file_header.thiszone = byte_swap_32 (pcap_file_header.thiszone);
pcap_file_header.sigfigs = byte_swap_32 (pcap_file_header.sigfigs);
pcap_file_header.snaplen = byte_swap_32 (pcap_file_header.snaplen);
pcap_file_header.linktype = byte_swap_32 (pcap_file_header.linktype);
#endif
int bitness = 0;
if (pcap_file_header.magic == TCPDUMP_MAGIC)
{
bitness = 0;
}
else if (pcap_file_header.magic == TCPDUMP_CIGAM)
{
bitness = 1;
}
else
{
fprintf (stderr, "%s: Invalid pcap header\n", in);
return 1;
}
if (bitness == 1)
{
pcap_file_header.magic = byte_swap_32 (pcap_file_header.magic);
pcap_file_header.version_major = byte_swap_16 (pcap_file_header.version_major);
pcap_file_header.version_minor = byte_swap_16 (pcap_file_header.version_minor);
pcap_file_header.thiszone = byte_swap_32 (pcap_file_header.thiszone);
pcap_file_header.sigfigs = byte_swap_32 (pcap_file_header.sigfigs);
pcap_file_header.snaplen = byte_swap_32 (pcap_file_header.snaplen);
pcap_file_header.linktype = byte_swap_32 (pcap_file_header.linktype);
}
if ((pcap_file_header.linktype != DLT_IEEE802_11)
&& (pcap_file_header.linktype != DLT_IEEE802_11_PRISM)
&& (pcap_file_header.linktype != DLT_IEEE802_11_RADIO)
&& (pcap_file_header.linktype != DLT_IEEE802_11_PPI_HDR))
{
fprintf (stderr, "%s: Unsupported linktype detected\n", in);
return -1;
}
// walk the packets
while (!feof (pcap))
{
pcap_pkthdr_t header;
const int nread1 = fread (&header, sizeof (pcap_pkthdr_t), 1, pcap);
if (nread1 != 1) continue;
#ifdef BIG_ENDIAN_HOST
header.tv_sec = byte_swap_32 (header.tv_sec);
header.tv_usec = byte_swap_32 (header.tv_usec);
header.caplen = byte_swap_32 (header.caplen);
header.len = byte_swap_32 (header.len);
#endif
if (bitness == 1)