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-rw-r--r--wiretap/eyesdn.c514
1 files changed, 514 insertions, 0 deletions
diff --git a/wiretap/eyesdn.c b/wiretap/eyesdn.c
new file mode 100644
index 0000000..4d22d6b
--- /dev/null
+++ b/wiretap/eyesdn.c
@@ -0,0 +1,514 @@
+/* eyesdn.c
+ *
+ * Wiretap Library
+ * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+#include "wtap-int.h"
+#include "eyesdn.h"
+#include "file_wrappers.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+static int eyesdn_file_type_subtype = -1;
+
+void register_eyesdn(void);
+
+/* This module reads the output of the EyeSDN USB S0/E1 ISDN probes
+ * They store HDLC frames of D and B channels in a binary format
+ * The fileformat is
+ *
+ * 1-6 Byte: EyeSDN - Magic
+ * 7-n Byte: Frames
+ *
+ * Each Frame starts with the 0xff Flag byte
+ * - Bytes 0-2: timestamp (usec in network byte order)
+ * - Bytes 3-7: timestamp (40bits sec since 1970 in network byte order)
+ * - Byte 8: channel (0 for D channel, 1-30 for B1-B30)
+ * - Byte 9: Sender Bit 0(0 NT, 1 TE), Protocol in Bits 7:1, see enum
+ * - Byte 10-11: frame size in bytes
+ * - Byte 12-n: Frame Payload
+ *
+ * All multibyte values are represented in network byte order
+ * The frame is terminated with a flag character (0xff)
+ * bytes 0xff within a frame are escaped using the 0xfe escape character
+ * the byte following the escape character is decremented by two:
+ * so 0xfe 0xfd is actually a 0xff
+ * Characters that need to be escaped are 0xff and 0xfe
+ */
+
+
+static gboolean esc_read(FILE_T fh, guint8 *buf, int len, int *err, gchar **err_info)
+{
+ int i;
+ int value;
+
+ for(i=0; i<len; i++) {
+ value=file_getc(fh);
+ if(value==-1) {
+ /* EOF or error */
+ *err=file_error(fh, err_info);
+ if(*err==0)
+ *err=WTAP_ERR_SHORT_READ;
+ return FALSE;
+ }
+ if(value==0xff) {
+ /* error !!, read into next frame */
+ *err=WTAP_ERR_BAD_FILE;
+ *err_info=g_strdup("eyesdn: No flag character seen in frame");
+ return FALSE;
+ }
+ if(value==0xfe) {
+ /* we need to escape */
+ value=file_getc(fh);
+ if(value==-1) {
+ /* EOF or error */
+ *err=file_error(fh, err_info);
+ if(*err==0)
+ *err=WTAP_ERR_SHORT_READ;
+ return FALSE;
+ }
+ value+=2;
+ }
+ buf[i]=value;
+ }
+
+ return TRUE;
+}
+
+/* Magic text to check for eyesdn-ness of file */
+static const unsigned char eyesdn_hdr_magic[] =
+{ 'E', 'y', 'e', 'S', 'D', 'N'};
+#define EYESDN_HDR_MAGIC_SIZE sizeof(eyesdn_hdr_magic)
+
+/* Size of a record header */
+#define EYESDN_HDR_LENGTH 12
+
+static gboolean eyesdn_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info, gint64 *data_offset);
+static gboolean eyesdn_seek_read(wtap *wth, gint64 seek_off,
+ wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
+static int read_eyesdn_rec(FILE_T fh, wtap_rec *rec, Buffer* buf,
+ int *err, gchar **err_info);
+
+/* Seeks to the beginning of the next packet, and returns the
+ byte offset. Returns -1 on failure, and sets "*err" to the error
+ and "*err_info" to null or an additional error string. */
+static gint64 eyesdn_seek_next_packet(wtap *wth, int *err, gchar **err_info)
+{
+ int byte;
+ gint64 cur_off;
+
+ while ((byte = file_getc(wth->fh)) != EOF) {
+ if (byte == 0xff) {
+ cur_off = file_tell(wth->fh);
+ if (cur_off == -1) {
+ /* Error. */
+ *err = file_error(wth->fh, err_info);
+ return -1;
+ }
+ return cur_off;
+ }
+ }
+ /* EOF or error. */
+ *err = file_error(wth->fh, err_info);
+ return -1;
+}
+
+wtap_open_return_val eyesdn_open(wtap *wth, int *err, gchar **err_info)
+{
+ char magic[EYESDN_HDR_MAGIC_SIZE];
+
+ /* Look for eyesdn header */
+ if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+ if (memcmp(magic, eyesdn_hdr_magic, EYESDN_HDR_MAGIC_SIZE) != 0)
+ return WTAP_OPEN_NOT_MINE;
+
+ wth->file_encap = WTAP_ENCAP_PER_PACKET;
+ wth->file_type_subtype = eyesdn_file_type_subtype;
+ wth->snapshot_length = 0; /* not known */
+ wth->subtype_read = eyesdn_read;
+ wth->subtype_seek_read = eyesdn_seek_read;
+ wth->file_tsprec = WTAP_TSPREC_USEC;
+
+ return WTAP_OPEN_MINE;
+}
+
+/* Find the next record and parse it; called from wtap_read(). */
+static gboolean eyesdn_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info, gint64 *data_offset)
+{
+ gint64 offset;
+
+ /* Find the next record */
+ offset = eyesdn_seek_next_packet(wth, err, err_info);
+ if (offset < 1)
+ return FALSE;
+ *data_offset = offset;
+
+ /* Parse the record */
+ return read_eyesdn_rec(wth->fh, rec, buf, err, err_info);
+}
+
+/* Used to read packets in random-access fashion */
+static gboolean
+eyesdn_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec,
+ Buffer *buf, int *err, gchar **err_info)
+{
+ if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
+ return FALSE;
+
+ return read_eyesdn_rec(wth->random_fh, rec, buf, err, err_info);
+}
+
+/* Parses a record. */
+static gboolean
+read_eyesdn_rec(FILE_T fh, wtap_rec *rec, Buffer *buf, int *err,
+ gchar **err_info)
+{
+ union wtap_pseudo_header *pseudo_header = &rec->rec_header.packet_header.pseudo_header;
+ guint8 hdr[EYESDN_HDR_LENGTH];
+ time_t secs;
+ int usecs;
+ guint pkt_len;
+ guint8 channel, direction;
+ guint8 *pd;
+
+ /* Our file pointer should be at the summary information header
+ * for a packet. Read in that header and extract the useful
+ * information.
+ */
+ if (!esc_read(fh, hdr, EYESDN_HDR_LENGTH, err, err_info))
+ return FALSE;
+
+ /* extract information from header */
+ usecs = pntoh24(&hdr[0]);
+#ifdef TV64BITS
+ secs = hdr[3];
+#else
+ secs = 0;
+#endif
+ secs = (secs << 8) | hdr[4];
+ secs = (secs << 8) | hdr[5];
+ secs = (secs << 8) | hdr[6];
+ secs = (secs << 8) | hdr[7];
+
+ channel = hdr[8];
+ direction = hdr[9];
+ pkt_len = pntoh16(&hdr[10]);
+
+ switch(direction >> 1) {
+
+ default:
+ case EYESDN_ENCAP_ISDN: /* ISDN */
+ pseudo_header->isdn.uton = direction & 1;
+ pseudo_header->isdn.channel = channel;
+ if(channel) { /* bearer channels */
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ISDN; /* recognises PPP */
+ pseudo_header->isdn.uton=!pseudo_header->isdn.uton; /* bug */
+ } else { /* D channel */
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ISDN;
+ }
+ break;
+
+ case EYESDN_ENCAP_MSG: /* Layer 1 message */
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_LAYER1_EVENT;
+ pseudo_header->l1event.uton = (direction & 1);
+ break;
+
+ case EYESDN_ENCAP_LAPB: /* X.25 via LAPB */
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_LAPB;
+ pseudo_header->dte_dce.flags = (direction & 1) ? 0 : 0x80;
+ break;
+
+ case EYESDN_ENCAP_ATM: { /* ATM cells */
+#define CELL_LEN 53
+ unsigned char cell[CELL_LEN];
+ gint64 cur_off;
+
+ if(pkt_len != CELL_LEN) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = ws_strdup_printf(
+ "eyesdn: ATM cell has a length != 53 (%u)",
+ pkt_len);
+ return FALSE;
+ }
+
+ cur_off = file_tell(fh);
+ if (!esc_read(fh, cell, CELL_LEN, err, err_info))
+ return FALSE;
+ if (file_seek(fh, cur_off, SEEK_SET, err) == -1)
+ return FALSE;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ATM_PDUS_UNTRUNCATED;
+ pseudo_header->atm.flags=ATM_RAW_CELL;
+ pseudo_header->atm.aal=AAL_UNKNOWN;
+ pseudo_header->atm.type=TRAF_UMTS_FP;
+ pseudo_header->atm.subtype=TRAF_ST_UNKNOWN;
+ pseudo_header->atm.vpi=((cell[0]&0xf)<<4) + (cell[0]&0xf);
+ pseudo_header->atm.vci=((cell[0]&0xf)<<4) + cell[0]; /* from cell */
+ pseudo_header->atm.channel=direction & 1;
+ }
+ break;
+
+ case EYESDN_ENCAP_MTP2: /* SS7 frames */
+ pseudo_header->mtp2.sent = direction & 1;
+ pseudo_header->mtp2.annex_a_used = MTP2_ANNEX_A_USED_UNKNOWN;
+ pseudo_header->mtp2.link_number = channel;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_MTP2_WITH_PHDR;
+ break;
+
+ case EYESDN_ENCAP_DPNSS: /* DPNSS */
+ pseudo_header->isdn.uton = direction & 1;
+ pseudo_header->isdn.channel = channel;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_DPNSS;
+ break;
+
+ case EYESDN_ENCAP_DASS2: /* DASS2 frames */
+ pseudo_header->isdn.uton = direction & 1;
+ pseudo_header->isdn.channel = channel;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_DPNSS;
+ break;
+
+ case EYESDN_ENCAP_BACNET: /* BACNET async over HDLC frames */
+ pseudo_header->isdn.uton = direction & 1;
+ pseudo_header->isdn.channel = channel;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR;
+ break;
+
+ case EYESDN_ENCAP_V5_EF: /* V5EF */
+ pseudo_header->isdn.uton = direction & 1;
+ pseudo_header->isdn.channel = channel;
+ rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_V5_EF;
+ break;
+ }
+
+ if(pkt_len > WTAP_MAX_PACKET_SIZE_STANDARD) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = ws_strdup_printf("eyesdn: File has %u-byte packet, bigger than maximum of %u",
+ pkt_len, WTAP_MAX_PACKET_SIZE_STANDARD);
+ return FALSE;
+ }
+
+ rec->rec_type = REC_TYPE_PACKET;
+ rec->block = wtap_block_create(WTAP_BLOCK_PACKET);
+ rec->presence_flags = WTAP_HAS_TS;
+ rec->ts.secs = secs;
+ rec->ts.nsecs = usecs * 1000;
+ rec->rec_header.packet_header.caplen = pkt_len;
+ rec->rec_header.packet_header.len = pkt_len;
+
+ /* Make sure we have enough room for the packet */
+ ws_buffer_assure_space(buf, pkt_len);
+
+ pd = ws_buffer_start_ptr(buf);
+ if (!esc_read(fh, pd, pkt_len, err, err_info))
+ return FALSE;
+ return TRUE;
+}
+
+
+static gboolean
+esc_write(wtap_dumper *wdh, const guint8 *buf, int len, int *err)
+{
+ int i;
+ guint8 byte;
+ static const guint8 esc = 0xfe;
+
+ for(i=0; i<len; i++) {
+ byte=buf[i];
+ if(byte == 0xff || byte == 0xfe) {
+ /*
+ * Escape the frame delimiter and escape byte.
+ */
+ if (!wtap_dump_file_write(wdh, &esc, sizeof esc, err))
+ return FALSE;
+ byte-=2;
+ }
+ if (!wtap_dump_file_write(wdh, &byte, sizeof byte, err))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static gboolean eyesdn_dump(wtap_dumper *wdh,
+ const wtap_rec *rec,
+ const guint8 *pd, int *err, gchar **err_info);
+
+static gboolean eyesdn_dump_open(wtap_dumper *wdh, int *err, gchar **err_info _U_)
+{
+ wdh->subtype_write=eyesdn_dump;
+
+ if (!wtap_dump_file_write(wdh, eyesdn_hdr_magic,
+ EYESDN_HDR_MAGIC_SIZE, err))
+ return FALSE;
+ *err=0;
+ return TRUE;
+}
+
+static int eyesdn_dump_can_write_encap(int encap)
+{
+ switch (encap) {
+ case WTAP_ENCAP_ISDN:
+ case WTAP_ENCAP_LAYER1_EVENT:
+ case WTAP_ENCAP_DPNSS:
+ case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
+ case WTAP_ENCAP_LAPB:
+ case WTAP_ENCAP_MTP2_WITH_PHDR:
+ case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
+ case WTAP_ENCAP_PER_PACKET:
+ return 0;
+
+ default:
+ return WTAP_ERR_UNWRITABLE_ENCAP;
+ }
+}
+
+/* Write a record for a packet to a dump file.
+ * Returns TRUE on success, FALSE on failure. */
+static gboolean eyesdn_dump(wtap_dumper *wdh,
+ const wtap_rec *rec,
+ const guint8 *pd, int *err, gchar **err_info _U_)
+{
+ static const guint8 start_flag = 0xff;
+ const union wtap_pseudo_header *pseudo_header = &rec->rec_header.packet_header.pseudo_header;
+ guint8 buf[EYESDN_HDR_LENGTH];
+ int usecs;
+ time_t secs;
+ int channel;
+ int origin;
+ int protocol;
+ int size;
+
+ /* We can only write packet records. */
+ if (rec->rec_type != REC_TYPE_PACKET) {
+ *err = WTAP_ERR_UNWRITABLE_REC_TYPE;
+ return FALSE;
+ }
+
+ /* Don't write out anything bigger than we can read.
+ * (The length field in packet headers is 16 bits, which
+ * imposes a hard limit.) */
+ if (rec->rec_header.packet_header.caplen > 65535) {
+ *err = WTAP_ERR_PACKET_TOO_LARGE;
+ return FALSE;
+ }
+
+ usecs=rec->ts.nsecs/1000;
+ secs=rec->ts.secs;
+ size=rec->rec_header.packet_header.caplen;
+ origin = pseudo_header->isdn.uton;
+ channel = pseudo_header->isdn.channel;
+
+ switch(rec->rec_header.packet_header.pkt_encap) {
+
+ case WTAP_ENCAP_ISDN:
+ protocol=EYESDN_ENCAP_ISDN; /* set depending on decoder format and mode */
+ break;
+
+ case WTAP_ENCAP_LAYER1_EVENT:
+ protocol=EYESDN_ENCAP_MSG;
+ break;
+
+ case WTAP_ENCAP_DPNSS:
+ protocol=EYESDN_ENCAP_DPNSS;
+ break;
+
+#if 0
+ case WTAP_ENCAP_DASS2:
+ protocol=EYESDN_ENCAP_DASS2;
+ break;
+#endif
+
+ case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
+ protocol=EYESDN_ENCAP_ATM;
+ channel=0x80;
+ break;
+
+ case WTAP_ENCAP_LAPB:
+ protocol=EYESDN_ENCAP_LAPB;
+ break;
+
+ case WTAP_ENCAP_MTP2_WITH_PHDR:
+ protocol=EYESDN_ENCAP_MTP2;
+ break;
+
+ case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
+ protocol=EYESDN_ENCAP_BACNET;
+ break;
+
+ case WTAP_ENCAP_V5_EF:
+ protocol=EYESDN_ENCAP_V5_EF;
+ break;
+
+ default:
+ *err=WTAP_ERR_UNWRITABLE_ENCAP;
+ return FALSE;
+ }
+
+ phton24(&buf[0], usecs);
+
+ buf[3] = (guint8)0;
+ buf[4] = (guint8)(0xff & (secs >> 24));
+ buf[5] = (guint8)(0xff & (secs >> 16));
+ buf[6] = (guint8)(0xff & (secs >> 8));
+ buf[7] = (guint8)(0xff & (secs >> 0));
+
+ buf[8] = (guint8) channel;
+ buf[9] = (guint8) (origin?1:0) + (protocol << 1);
+ phtons(&buf[10], size);
+
+ /* start flag */
+ if (!wtap_dump_file_write(wdh, &start_flag, sizeof start_flag, err))
+ return FALSE;
+ if (!esc_write(wdh, buf, 12, err))
+ return FALSE;
+ if (!esc_write(wdh, pd, size, err))
+ return FALSE;
+ return TRUE;
+}
+
+static const struct supported_block_type eyesdn_blocks_supported[] = {
+ /*
+ * We support packet blocks, with no comments or other options.
+ */
+ { WTAP_BLOCK_PACKET, MULTIPLE_BLOCKS_SUPPORTED, NO_OPTIONS_SUPPORTED }
+};
+
+static const struct file_type_subtype_info eyesdn_info = {
+ "EyeSDN USB S0/E1 ISDN trace format", "eyesdn", "trc", NULL,
+ FALSE, BLOCKS_SUPPORTED(eyesdn_blocks_supported),
+ eyesdn_dump_can_write_encap, eyesdn_dump_open, NULL
+};
+
+void register_eyesdn(void)
+{
+ eyesdn_file_type_subtype = wtap_register_file_type_subtype(&eyesdn_info);
+
+ /*
+ * Register name for backwards compatibility with the
+ * wtap_filetypes table in Lua.
+ */
+ wtap_register_backwards_compatibility_lua_name("EYESDN",
+ eyesdn_file_type_subtype);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */
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