Create a common libui using CMake similar to what we do with Autotools.

Move the GTK+ text import code to the common UI directory. Create
wtap_encap_requires_phdr() from code in file_import_dlg.c.

svn path=/trunk/; revision=44904

1 files changed, 976 insertions, 0 deletions

diff --git a/ui/text_import.c b/ui/text_import.c
new file mode 100644
index 0000000000..6c8d9321b1
--- /dev/null
+++ b/ui/text_import.c
@@ -0,0 +1,976 @@
+/* text_import.c
+ * State machine for text import
+ * November 2010, Jaap Keuter <jaap.keuter@xs4all.nl>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Based on text2pcap.c by Ashok Narayanan <ashokn@cisco.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ */
+
+/*******************************************************************************
+ *
+ * This utility reads in an ASCII hexdump of this common format:
+ *
+ * 00000000  00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
+ * 00000010  03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3......
+ * 00000020  03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
+ * 00000030  01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
+ *
+ * Each bytestring line consists of an offset, one or more bytes, and
+ * text at the end. An offset is defined as a hex string of more than
+ * two characters. A byte is defined as a hex string of exactly two
+ * characters. The text at the end is ignored, as is any text before
+ * the offset. Bytes read from a bytestring line are added to the
+ * current packet only if all the following conditions are satisfied:
+ *
+ * - No text appears between the offset and the bytes (any bytes appearing after
+ *   such text would be ignored)
+ *
+ * - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
+ *   exactly 32 bytes must have been read into this packet before this. If the offset
+ *   is wrong, the packet is immediately terminated
+ *
+ * A packet start is signalled by a zero offset.
+ *
+ * Lines starting with #TEXT2PCAP are directives. These allow the user
+ * to embed instructions into the capture file which allows text2pcap
+ * to take some actions (e.g. specifying the encapsulation
+ * etc.). Currently no directives are implemented.
+ *
+ * Lines beginning with # which are not directives are ignored as
+ * comments. Currently all non-hexdump text is ignored by text2pcap;
+ * in the future, text processing may be added, but lines prefixed
+ * with '#' will still be ignored.
+ *
+ * The output is a libpcap packet containing Ethernet frames by
+ * default. This program takes options which allow the user to add
+ * dummy Ethernet, IP and UDP or TCP headers to the packets in order
+ * to allow dumps of L3 or higher protocols to be decoded.
+ *
+ * Considerable flexibility is built into this code to read hexdumps
+ * of slightly different formats. For example, any text prefixing the
+ * hexdump line is dropped (including mail forwarding '>'). The offset
+ * can be any hex number of four digits or greater.
+ *
+ * This converter cannot read a single packet greater than 64K. Packet
+ * snaplength is automatically set to 64K.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+/*
+ * Just make sure we include the prototype for strptime as well
+ * (needed for glibc 2.2) but make sure we do this only if not
+ * yet defined.
+ */
+#ifndef __USE_XOPEN
+#  define __USE_XOPEN
+#endif
+#ifndef _XOPEN_SOURCE
+#  ifndef __sun
+#    define _XOPEN_SOURCE 600
+#  endif
+#endif
+
+/*
+ * Defining _XOPEN_SOURCE is needed on some platforms, e.g. platforms
+ * using glibc, to expand the set of things system header files define.
+ *
+ * Unfortunately, on other platforms, such as some versions of Solaris
+ * (including Solaris 10), it *reduces* that set as well, causing
+ * strptime() not to be declared, presumably because the version of the
+ * X/Open spec that _XOPEN_SOURCE implies doesn't include strptime() and
+ * blah blah blah namespace pollution blah blah blah.
+ *
+ * So we define __EXTENSIONS__ so that "strptime()" is declared.
+ */
+#ifndef __EXTENSIONS__
+#  define __EXTENSIONS__
+#endif
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wsutil/file_util.h>
+
+#include <time.h>
+#include <glib.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+#include <assert.h>
+
+#include <epan/tvbuff.h>
+#include <wsutil/crc32.h>
+#include <epan/in_cksum.h>
+
+#ifdef NEED_STRPTIME_H
+# include "wsutil/strptime.h"
+#endif
+
+#include "text_import.h"
+#include "text_import_scanner.h"
+
+/*--- Options --------------------------------------------------------------------*/
+
+/* Debug level */
+static int debug = 0;
+
+/* Dummy Ethernet header */
+static int hdr_ethernet = FALSE;
+static unsigned long hdr_ethernet_proto = 0;
+
+/* Dummy IP header */
+static int hdr_ip = FALSE;
+static long hdr_ip_proto = 0;
+
+/* Dummy UDP header */
+static int hdr_udp = FALSE;
+static unsigned long hdr_dest_port = 0;
+static unsigned long hdr_src_port = 0;
+
+/* Dummy TCP header */
+static int hdr_tcp = FALSE;
+
+/* Dummy SCTP header */
+static int hdr_sctp = FALSE;
+static unsigned long hdr_sctp_src  = 0;
+static unsigned long hdr_sctp_dest = 0;
+static unsigned long hdr_sctp_tag  = 0;
+
+/* Dummy DATA chunk header */
+static int hdr_data_chunk = FALSE;
+static unsigned char  hdr_data_chunk_type = 0;
+static unsigned char  hdr_data_chunk_bits = 3;
+static unsigned long  hdr_data_chunk_tsn  = 0;
+static unsigned short hdr_data_chunk_sid  = 0;
+static unsigned short hdr_data_chunk_ssn  = 0;
+static unsigned long  hdr_data_chunk_ppid = 0;
+
+
+/*--- Local data -----------------------------------------------------------------*/
+
+/* This is where we store the packet currently being built */
+static unsigned char *packet_buf;
+static unsigned long curr_offset = 0;
+static unsigned long max_offset = IMPORT_MAX_PACKET;
+static unsigned long packet_start = 0;
+static void start_new_packet (void);
+
+/* This buffer contains strings present before the packet offset 0 */
+#define PACKET_PREAMBLE_MAX_LEN	2048
+static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
+static int packet_preamble_len = 0;
+
+/* Time code of packet, derived from packet_preamble */
+static time_t ts_sec = 0;
+static guint32 ts_usec = 0;
+static char *ts_fmt = NULL;
+static struct tm timecode_default;
+
+static wtap_dumper* wdh;
+
+/* HDR_ETH Offset base to parse */
+static unsigned long offset_base = 16;
+
+/* ----- State machine -----------------------------------------------------------*/
+
+/* Current state of parser */
+typedef enum {
+    INIT,             /* Waiting for start of new packet */
+    START_OF_LINE,    /* Starting from beginning of line */
+    READ_OFFSET,      /* Just read the offset */
+    READ_BYTE,        /* Just read a byte */
+    READ_TEXT         /* Just read text - ignore until EOL */
+} parser_state_t;
+static parser_state_t state = INIT;
+
+static const char *state_str[] = {"Init",
+                           "Start-of-line",
+                           "Offset",
+                           "Byte",
+                           "Text"
+};
+
+static const char *token_str[] = {"",
+                           "Byte",
+                           "Offset",
+                           "Directive",
+                           "Text",
+                           "End-of-line"
+};
+
+/* ----- Skeleton Packet Headers --------------------------------------------------*/
+
+typedef struct {
+    guint8  dest_addr[6];
+    guint8  src_addr[6];
+    guint16 l3pid;
+} hdr_ethernet_t;
+
+static hdr_ethernet_t HDR_ETHERNET = {
+    {0x20, 0x52, 0x45, 0x43, 0x56, 0x00},
+    {0x20, 0x53, 0x45, 0x4E, 0x44, 0x00},
+    0};
+
+typedef struct {
+    guint8  ver_hdrlen;
+    guint8  dscp;
+    guint16 packet_length;
+    guint16 identification;
+    guint8  flags;
+    guint8  fragment;
+    guint8  ttl;
+    guint8  protocol;
+    guint16 hdr_checksum;
+    guint32 src_addr;
+    guint32 dest_addr;
+} hdr_ip_t;
+
+static hdr_ip_t HDR_IP =
+  {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
+
+static struct {         /* pseudo header for checksum calculation */
+    guint32 src_addr;
+    guint32 dest_addr;
+    guint8  zero;
+    guint8  protocol;
+    guint16 length;
+} pseudoh;
+
+typedef struct {
+    guint16 source_port;
+    guint16 dest_port;
+    guint16 length;
+    guint16 checksum;
+} hdr_udp_t;
+
+static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
+
+typedef struct {
+    guint16 source_port;
+    guint16 dest_port;
+    guint32 seq_num;
+    guint32 ack_num;
+    guint8  hdr_length;
+    guint8  flags;
+    guint16 window;
+    guint16 checksum;
+    guint16 urg;
+} hdr_tcp_t;
+
+static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};
+
+typedef struct {
+    guint16 src_port;
+    guint16 dest_port;
+    guint32 tag;
+    guint32 checksum;
+} hdr_sctp_t;
+
+static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
+
+typedef struct {
+    guint8  type;
+    guint8  bits;
+    guint16 length;
+    guint32 tsn;
+    guint16 sid;
+    guint16 ssn;
+    guint32 ppid;
+} hdr_data_chunk_t;
+
+static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
+
+/* Link-layer type; see net/bpf.h for details */
+static unsigned long pcap_link_type = 1;   /* Default is DLT-EN10MB */
+
+/*----------------------------------------------------------------------
+ * Parse a single hex number
+ * Will abort the program if it can't parse the number
+ * Pass in TRUE if this is an offset, FALSE if not
+ */
+static unsigned long
+parse_num (const char *str, int offset)
+{
+    unsigned long num;
+    char *c;
+
+    num = strtoul(str, &c, offset ? offset_base : 16);
+    if (c==str) {
+        fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
+    }
+    return num;
+}
+
+/*----------------------------------------------------------------------
+ * Write this byte into current packet
+ */
+static void
+write_byte (const char *str)
+{
+    unsigned long num;
+
+    num = parse_num(str, FALSE);
+    packet_buf[curr_offset] = (unsigned char) num;
+    curr_offset ++;
+    if (curr_offset >= max_offset) /* packet full */
+        start_new_packet();
+}
+
+/*----------------------------------------------------------------------
+ * Remove bytes from the current packet
+ */
+static void
+unwrite_bytes (unsigned long nbytes)
+{
+    curr_offset -= nbytes;
+}
+
+/*----------------------------------------------------------------------
+ * Determin SCTP chunk padding length
+ */
+static unsigned long
+number_of_padding_bytes (unsigned long length)
+{
+  unsigned long remainder;
+
+  remainder = length % 4;
+
+  if (remainder == 0)
+    return 0;
+  else
+    return 4 - remainder;
+}
+
+/*----------------------------------------------------------------------
+ * Write current packet out
+ */
+void
+write_current_packet (void)
+{
+    int prefix_length = 0;
+    int proto_length = 0;
+    int ip_length = 0;
+    int eth_trailer_length = 0;
+    int prefix_index = 0;
+    int i, padding_length;
+
+    if (curr_offset > 0) {
+        /* Write the packet */
+
+        /* Compute packet length */
+        prefix_length = 0;
+        if (hdr_data_chunk) { prefix_length += sizeof(HDR_DATA_CHUNK); }
+        if (hdr_sctp) { prefix_length += sizeof(HDR_SCTP); }
+        if (hdr_udp) { prefix_length += sizeof(HDR_UDP); proto_length = prefix_length + curr_offset; }
+        if (hdr_tcp) { prefix_length += sizeof(HDR_TCP); proto_length = prefix_length + curr_offset; }
+        if (hdr_ip) {
+            prefix_length += sizeof(HDR_IP);
+            ip_length = prefix_length + curr_offset + ((hdr_data_chunk) ? number_of_padding_bytes(curr_offset) : 0);
+        }
+        if (hdr_ethernet) { prefix_length += sizeof(HDR_ETHERNET); }
+
+        /* Make room for dummy header */
+        memmove(&packet_buf[prefix_length], packet_buf, curr_offset);
+
+        if (hdr_ethernet) {
+            /* Pad trailer */
+            if (prefix_length + curr_offset < 60) {
+                eth_trailer_length = 60 - (prefix_length + curr_offset);
+            }
+        }
+
+        /* Write Ethernet header */
+        if (hdr_ethernet) {
+            HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
+            memcpy(&packet_buf[prefix_index], &HDR_ETHERNET, sizeof(HDR_ETHERNET));
+            prefix_index += sizeof(HDR_ETHERNET);
+        }
+
+        /* Write IP header */
+        if (hdr_ip) {
+            vec_t cksum_vector[1];
+
+            HDR_IP.packet_length = g_htons(ip_length);
+            HDR_IP.protocol = (guint8) hdr_ip_proto;
+            HDR_IP.hdr_checksum = 0;
+            cksum_vector[0].ptr = (guint8 *)&HDR_IP; cksum_vector[0].len = sizeof(HDR_IP);
+            HDR_IP.hdr_checksum = in_cksum(cksum_vector, 1);
+
+            memcpy(&packet_buf[prefix_index], &HDR_IP, sizeof(HDR_IP));
+            prefix_index += sizeof(HDR_IP);
+        }
+
+        /* initialize pseudo header for checksum calculation */
+        pseudoh.src_addr    = HDR_IP.src_addr;
+        pseudoh.dest_addr   = HDR_IP.dest_addr;
+        pseudoh.zero        = 0;
+        pseudoh.protocol    = (guint8) hdr_ip_proto;
+        pseudoh.length      = g_htons(proto_length);
+
+        /* Write UDP header */
+        if (hdr_udp) {
+            vec_t cksum_vector[3];
+
+            HDR_UDP.source_port = g_htons(hdr_src_port);
+            HDR_UDP.dest_port = g_htons(hdr_dest_port);
+            HDR_UDP.length = g_htons(proto_length);
+
+            HDR_UDP.checksum = 0;
+            cksum_vector[0].ptr = (guint8 *)&pseudoh; cksum_vector[0].len = sizeof(pseudoh);
+            cksum_vector[1].ptr = (guint8 *)&HDR_UDP; cksum_vector[1].len = sizeof(HDR_UDP);
+            cksum_vector[2].ptr = &packet_buf[prefix_length]; cksum_vector[2].len = curr_offset;
+            HDR_UDP.checksum = in_cksum(cksum_vector, 3);
+
+            memcpy(&packet_buf[prefix_index], &HDR_UDP, sizeof(HDR_UDP));
+            prefix_index += sizeof(HDR_UDP);
+        }
+
+        /* Write TCP header */
+        if (hdr_tcp) {
+            vec_t cksum_vector[3];
+
+            HDR_TCP.source_port = g_htons(hdr_src_port);
+            HDR_TCP.dest_port = g_htons(hdr_dest_port);
+            /* HDR_TCP.seq_num already correct */
+            HDR_TCP.window = g_htons(0x2000);
+
+            HDR_TCP.checksum = 0;
+            cksum_vector[0].ptr = (guint8 *)&pseudoh; cksum_vector[0].len = sizeof(pseudoh);
+            cksum_vector[1].ptr = (guint8 *)&HDR_TCP; cksum_vector[1].len = sizeof(HDR_TCP);
+            cksum_vector[2].ptr = &packet_buf[prefix_length]; cksum_vector[2].len = curr_offset;
+            HDR_TCP.checksum = in_cksum(cksum_vector, 3);
+
+            memcpy(&packet_buf[prefix_index], &HDR_TCP, sizeof(HDR_TCP));
+            prefix_index += sizeof(HDR_TCP);
+        }
+
+        /* Compute DATA chunk header and append padding */
+        if (hdr_data_chunk) {
+            HDR_DATA_CHUNK.type   = hdr_data_chunk_type;
+            HDR_DATA_CHUNK.bits   = hdr_data_chunk_bits;
+            HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
+            HDR_DATA_CHUNK.tsn    = g_htonl(hdr_data_chunk_tsn);
+            HDR_DATA_CHUNK.sid    = g_htons(hdr_data_chunk_sid);
+            HDR_DATA_CHUNK.ssn    = g_htons(hdr_data_chunk_ssn);
+            HDR_DATA_CHUNK.ppid   = g_htonl(hdr_data_chunk_ppid);
+
+            padding_length = number_of_padding_bytes(curr_offset);
+            for (i=0; i<padding_length; i++)
+                packet_buf[prefix_length+curr_offset+i] = 0;
+            curr_offset += padding_length;
+        }
+
+        /* Write SCTP header */
+        if (hdr_sctp) {
+            HDR_SCTP.src_port  = g_htons(hdr_sctp_src);
+            HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
+            HDR_SCTP.tag       = g_htonl(hdr_sctp_tag);
+            HDR_SCTP.checksum  = g_htonl(0);
+
+            HDR_SCTP.checksum  = crc32c_calculate(&HDR_SCTP, sizeof(HDR_SCTP), CRC32C_PRELOAD);
+            if (hdr_data_chunk)
+                HDR_SCTP.checksum  = crc32c_calculate(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
+            HDR_SCTP.checksum  = g_htonl(~crc32c_calculate(&packet_buf[prefix_length], curr_offset, HDR_SCTP.checksum));
+
+            memcpy(&packet_buf[prefix_index], &HDR_SCTP, sizeof(HDR_SCTP));
+            prefix_index += sizeof(HDR_SCTP);
+        }
+
+        /* Write DATA chunk header */
+        if (hdr_data_chunk) {
+            memcpy(&packet_buf[prefix_index], &HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK));
+            prefix_index += sizeof(HDR_DATA_CHUNK);
+        }
+
+        /* Write Ethernet trailer */
+        if (hdr_ethernet && eth_trailer_length > 0) {
+            memset(&packet_buf[prefix_length+curr_offset], 0, eth_trailer_length);
+        }
+
+        HDR_TCP.seq_num = g_htonl(g_ntohl(HDR_TCP.seq_num) + curr_offset);
+
+        {
+            /* Write the packet */
+            struct wtap_pkthdr pkthdr;
+            int err;
+
+            pkthdr.ts.secs = (guint32)ts_sec;
+            pkthdr.ts.nsecs = ts_usec * 1000;
+            if (ts_fmt == NULL) { ts_usec++; }  /* fake packet counter */
+            pkthdr.caplen = pkthdr.len = prefix_length + curr_offset + eth_trailer_length;
+            pkthdr.pkt_encap = pcap_link_type;
+
+            wtap_dump(wdh, &pkthdr, NULL, packet_buf, &err);
+        }
+    }
+
+    packet_start += curr_offset;
+    curr_offset = 0;
+}
+
+
+/*----------------------------------------------------------------------
+ * Append a token to the packet preamble.
+ */
+static void
+append_to_preamble(char *str)
+{
+    size_t toklen;
+
+    if (packet_preamble_len != 0) {
+        if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
+            return;	/* no room to add more preamble */
+        /* Add a blank separator between the previous token and this token. */
+        packet_preamble[packet_preamble_len++] = ' ';
+    }
+    toklen = strlen(str);
+    if (toklen != 0) {
+        if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
+            return;	/* no room to add the token to the preamble */
+        g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
+        packet_preamble_len += (int) toklen;
+        if (debug >= 2) {
+            char *c;
+            char xs[PACKET_PREAMBLE_MAX_LEN];
+            g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
+            while ((c = strchr(xs, '\r')) != NULL) *c=' ';
+            fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
+        }
+    }
+}
+
+/*----------------------------------------------------------------------
+ * Parse the preamble to get the timecode.
+ */
+
+static void
+parse_preamble (void)
+{
+	struct tm timecode;
+	char *subsecs;
+	char *p;
+	int  subseclen;
+	int  i;
+
+	/*
+	 * If no "-t" flag was specified, don't attempt to parse a packet
+	 * preamble to extract a time stamp.
+	 */
+	if (ts_fmt == NULL)
+	    return;
+
+	/*
+	 * Initialize to today localtime, just in case not all fields
+	 * of the date and time are specified.
+	 */
+
+	timecode = timecode_default;
+	ts_usec = 0;
+
+	/*
+	 * Null-terminate the preamble.
+	 */
+	packet_preamble[packet_preamble_len] = '\0';
+
+	/* Ensure preamble has more than two chars before atempting to parse.
+	 * This should cover line breaks etc that get counted.
+	 */
+	if ( strlen(packet_preamble) > 2 ) {
+		/* Get Time leaving subseconds */
+		subsecs = strptime( packet_preamble, ts_fmt, &timecode );
+		if (subsecs != NULL) {
+			/* Get the long time from the tm structure */
+                        /*  (will return -1 if failure)            */
+			ts_sec  = mktime( &timecode );
+		} else
+			ts_sec = -1;	/* we failed to parse it */
+
+		/* This will ensure incorrectly parsed dates get set to zero */
+		if ( -1 == ts_sec )
+		{
+			/* Sanitize - remove all '\r' */
+			char *c;
+			while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
+			fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n   (defaulting to Jan 1,1970 00:00:00 GMT)\n",
+				 packet_preamble, ts_fmt);
+			if (debug >= 2) {
+				fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
+					timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
+					timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
+			}
+			ts_sec  = 0;  /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
+			ts_usec = 0;
+		}
+		else
+		{
+			/* Parse subseconds */
+			ts_usec = strtol(subsecs, &p, 10);
+			if (subsecs == p) {
+				/* Error */
+				ts_usec = 0;
+			} else {
+				/*
+				 * Convert that number to a number
+				 * of microseconds; if it's N digits
+				 * long, it's in units of 10^(-N) seconds,
+				 * so, to convert it to units of
+				 * 10^-6 seconds, we multiply by
+				 * 10^(6-N).
+				 */
+				subseclen = (int) (p - subsecs);
+				if (subseclen > 6) {
+					/*
+					 * *More* than 6 digits; 6-N is
+					 * negative, so we divide by
+					 * 10^(N-6).
+					 */
+					for (i = subseclen - 6; i != 0; i--)
+						ts_usec /= 10;
+				} else if (subseclen < 6) {
+					for (i = 6 - subseclen; i != 0; i--)
+						ts_usec *= 10;
+				}
+			}
+		}
+	}
+	if (debug >= 2) {
+		char *c;
+		while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
+		fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
+		fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)ts_sec, ts_usec);
+	}
+
+
+	/* Clear Preamble */
+	packet_preamble_len = 0;
+}
+
+/*----------------------------------------------------------------------
+ * Start a new packet
+ */
+static void
+start_new_packet (void)
+{
+    if (debug>=1)
+        fprintf(stderr, "Start new packet\n");
+
+    /* Write out the current packet, if required */
+    write_current_packet();
+
+    /* Ensure we parse the packet preamble as it may contain the time */
+    parse_preamble();
+}
+
+/*----------------------------------------------------------------------
+ * Process a directive
+ */
+static void
+process_directive (char *str)
+{
+    fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
+
+}
+
+/*----------------------------------------------------------------------
+ * Parse a single token (called from the scanner)
+ */
+void
+parse_token (token_t token, char *str)
+{
+    unsigned long num;
+
+    /*
+     * This is implemented as a simple state machine of five states.
+     * State transitions are caused by tokens being received from the
+     * scanner. The code should be self_documenting.
+     */
+
+    if (debug>=2) {
+        /* Sanitize - remove all '\r' */
+        char *c;
+        if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
+
+        fprintf(stderr, "(%s, %s \"%s\") -> (",
+                state_str[state], token_str[token], str ? str : "");
+    }
+
+    switch(state) {
+
+    /* ----- Waiting for new packet -------------------------------------------*/
+    case INIT:
+        switch(token) {
+        case T_TEXT:
+            append_to_preamble(str);
+            break;
+        case T_DIRECTIVE:
+            process_directive(str);
+            break;
+        case T_OFFSET:
+            num = parse_num(str, TRUE);
+            if (num==0) {
+                /* New packet starts here */
+                start_new_packet();
+                state = READ_OFFSET;
+            }
+            break;
+        default:
+            break;
+        }
+        break;
+
+    /* ----- Processing packet, start of new line -----------------------------*/
+    case START_OF_LINE:
+        switch(token) {
+        case T_TEXT:
+            append_to_preamble(str);
+            break;
+        case T_DIRECTIVE:
+            process_directive(str);
+            break;
+        case T_OFFSET:
+            num = parse_num(str, TRUE);
+            if (num==0) {
+                /* New packet starts here */
+                start_new_packet();
+                packet_start = 0;
+                state = READ_OFFSET;
+            } else if ((num - packet_start) != curr_offset) {
+                /*
+                 * The offset we read isn't the one we expected.
+                 * This may only mean that we mistakenly interpreted
+                 * some text as byte values (e.g., if the text dump
+                 * of packet data included a number with spaces around
+                 * it).  If the offset is less than what we expected,
+                 * assume that's the problem, and throw away the putative
+                 * extra byte values.
+                 */
+                if (num < curr_offset) {
+                    unwrite_bytes(curr_offset - num);
+                    state = READ_OFFSET;
+                } else {
+                    /* Bad offset; switch to INIT state */
+                    if (debug>=1)
+                        fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
+                                curr_offset, num);
+                    write_current_packet();
+                    state = INIT;
+                }
+            } else
+                state = READ_OFFSET;
+            break;
+        default:
+            break;
+        }
+        break;
+
+    /* ----- Processing packet, read offset -----------------------------------*/
+    case READ_OFFSET:
+        switch(token) {
+        case T_BYTE:
+            /* Record the byte */
+            state = READ_BYTE;
+            write_byte(str);
+            break;
+        case T_TEXT:
+        case T_DIRECTIVE:
+        case T_OFFSET:
+            state = READ_TEXT;
+            break;
+        case T_EOL:
+            state = START_OF_LINE;
+            break;
+        default:
+            break;
+        }
+        break;
+
+    /* ----- Processing packet, read byte -------------------------------------*/
+    case READ_BYTE:
+        switch(token) {
+        case T_BYTE:
+            /* Record the byte */
+            write_byte(str);
+            break;
+        case T_TEXT:
+        case T_DIRECTIVE:
+        case T_OFFSET:
+            state = READ_TEXT;
+            break;
+        case T_EOL:
+            state = START_OF_LINE;
+            break;
+        default:
+            break;
+        }
+        break;
+
+    /* ----- Processing packet, read text -------------------------------------*/
+    case READ_TEXT:
+        switch(token) {
+        case T_EOL:
+            state = START_OF_LINE;
+            break;
+        default:
+            break;
+        }
+        break;
+
+    default:
+        fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
+        exit(-1);
+    }
+
+    if (debug>=2)
+        fprintf(stderr, ", %s)\n", state_str[state]);
+
+}
+
+/*----------------------------------------------------------------------
+ * take in the import config information
+ */
+void
+text_import_setup(text_import_info_t *info)
+{
+    packet_buf = (unsigned char *)g_malloc(sizeof(HDR_ETHERNET) + sizeof(HDR_IP) +
+                                           sizeof(HDR_SCTP) + sizeof(HDR_DATA_CHUNK) +
+                                           IMPORT_MAX_PACKET);
+
+    if (!packet_buf)
+    {
+        fprintf(stderr, "FATAL ERROR: no memory for packet buffer");
+        exit(-1);
+    }
+
+    /* Lets start from the beginning */
+    state = INIT;
+    curr_offset = 0;
+    packet_start = 0;
+    packet_preamble_len = 0;
+    ts_sec = time(0);            /* initialize to current time */
+    timecode_default = *localtime(&ts_sec);
+    timecode_default.tm_isdst = -1;     /* Unknown for now, depends on time given to the strptime() function */
+    ts_usec = 0;
+
+    /* Dummy headers */
+    hdr_ethernet = FALSE;
+    hdr_ip = FALSE;
+    hdr_udp = FALSE;
+    hdr_tcp = FALSE;
+    hdr_sctp = FALSE;
+    hdr_data_chunk = FALSE;
+
+    offset_base = (info->offset_type == OFFSET_HEX) ? 16 :
+                  (info->offset_type == OFFSET_OCT) ? 8 :
+                  (info->offset_type == OFFSET_DEC) ? 10 :
+                  16;
+
+    if (info->date_timestamp)
+    {
+        ts_fmt = info->date_timestamp_format;
+    }
+
+    pcap_link_type = info->encapsulation;
+
+    wdh = info->wdh;
+
+    switch (info->dummy_header_type)
+    {
+        case HEADER_ETH:
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = info->pid;
+            break;
+
+        case HEADER_IPV4:
+            hdr_ip = TRUE;
+            hdr_ip_proto = info->protocol;
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = 0x800;
+            break;
+
+        case HEADER_UDP:
+            hdr_udp = TRUE;
+            hdr_tcp = FALSE;
+            hdr_src_port = info->src_port;
+            hdr_dest_port = info->dst_port;
+            hdr_ip = TRUE;
+            hdr_ip_proto = 17;
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = 0x800;
+            break;
+
+        case HEADER_TCP:
+            hdr_tcp = TRUE;
+            hdr_udp = FALSE;
+            hdr_src_port = info->src_port;
+            hdr_dest_port = info->dst_port;
+            hdr_ip = TRUE;
+            hdr_ip_proto = 6;
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = 0x800;
+            break;
+
+        case HEADER_SCTP:
+            hdr_sctp = TRUE;
+            hdr_sctp_src = info->src_port;
+            hdr_sctp_dest = info->dst_port;
+            hdr_sctp_tag = info->tag;
+            hdr_ip = TRUE;
+            hdr_ip_proto = 132;
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = 0x800;
+            break;
+
+        case HEADER_SCTP_DATA:
+            hdr_sctp = TRUE;
+            hdr_data_chunk = TRUE;
+            hdr_sctp_src = info->src_port;
+            hdr_sctp_dest = info->dst_port;
+            hdr_data_chunk_ppid = info->ppi;
+            hdr_ip = TRUE;
+            hdr_ip_proto = 132;
+            hdr_ethernet = TRUE;
+            hdr_ethernet_proto = 0x800;
+            break;
+
+        default:
+            break;
+    }
+
+    max_offset = info->max_frame_length;
+}
+
+/*----------------------------------------------------------------------
+ * Clean up after text import
+ */
+void
+text_import_cleanup(void)
+{
+    g_free(packet_buf);
+}