1 /**-*-C-*-**********************************************************************
5 * Utility to convert an ASCII hexdump into a libpcap-format capture file
7 * (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
11 * Wireshark - Network traffic analyzer
12 * By Gerald Combs <gerald@wireshark.org>
13 * Copyright 1998 Gerald Combs
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 *******************************************************************************/
31 /*******************************************************************************
33 * This utility reads in an ASCII hexdump of this common format:
35 * 00000000 00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
36 * 00000010 03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3...
\7f..
37 * 00000020 03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
38 * 00000030 01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
40 * Each bytestring line consists of an offset, one or more bytes, and
41 * text at the end. An offset is defined as a hex string of more than
42 * two characters. A byte is defined as a hex string of exactly two
43 * characters. The text at the end is ignored, as is any text before
44 * the offset. Bytes read from a bytestring line are added to the
45 * current packet only if all the following conditions are satisfied:
47 * - No text appears between the offset and the bytes (any bytes appearing after
48 * such text would be ignored)
50 * - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
51 * exactly 32 bytes must have been read into this packet before this. If the offset
52 * is wrong, the packet is immediately terminated
54 * A packet start is signaled by a zero offset.
56 * Lines starting with #TEXT2PCAP are directives. These allow the user
57 * to embed instructions into the capture file which allows text2pcap
58 * to take some actions (e.g. specifying the encapsulation
59 * etc.). Currently no directives are implemented.
61 * Lines beginning with # which are not directives are ignored as
62 * comments. Currently all non-hexdump text is ignored by text2pcap;
63 * in the future, text processing may be added, but lines prefixed
64 * with '#' will still be ignored.
66 * The output is a libpcap packet containing Ethernet frames by
67 * default. This program takes options which allow the user to add
68 * dummy Ethernet, IP and UDP or TCP headers to the packets in order
69 * to allow dumps of L3 or higher protocols to be decoded.
71 * Considerable flexibility is built into this code to read hexdumps
72 * of slightly different formats. For example, any text prefixing the
73 * hexdump line is dropped (including mail forwarding '>'). The offset
74 * can be any hex number of four digits or greater.
76 * This converter cannot read a single packet greater than 64K. Packet
77 * snaplength is automatically set to 64K.
85 * Just make sure we include the prototype for strptime as well
86 * (needed for glibc 2.2) but make sure we do this only if not
93 # define _XOPEN_SOURCE
97 * Defining _XOPEN_SOURCE is needed on some platforms, e.g. platforms
98 * using glibc, to expand the set of things system header files define.
100 * Unfortunately, on other platforms, such as some versions of Solaris
101 * (including Solaris 10), it *reduces* that set as well, causing
102 * strptime() not to be declared, presumably because the version of the
103 * X/Open spec that _XOPEN_SOURCE implies doesn't include strptime() and
104 * blah blah blah namespace pollution blah blah blah.
106 * So we define __EXTENSIONS__ so that "strptime()" is declared.
108 #ifndef __EXTENSIONS__
109 # define __EXTENSIONS__
116 #include <wsutil/file_util.h>
129 #include "wsutil/wsgetopt.h"
132 #ifdef NEED_STRPTIME_H
133 # include "wsutil/strptime.h"
136 #include "text2pcap.h"
137 #include "svnversion.h"
140 #include <wsutil/unicode-utils.h>
143 /*--- Options --------------------------------------------------------------------*/
146 static int debug = 0;
148 static int quiet = FALSE;
150 /* Dummy Ethernet header */
151 static int hdr_ethernet = FALSE;
152 static unsigned long hdr_ethernet_proto = 0;
154 /* Dummy IP header */
155 static int hdr_ip = FALSE;
156 static long hdr_ip_proto = 0;
158 /* Dummy UDP header */
159 static int hdr_udp = FALSE;
160 static unsigned long hdr_dest_port = 0;
161 static unsigned long hdr_src_port = 0;
163 /* Dummy TCP header */
164 static int hdr_tcp = FALSE;
166 /* Dummy SCTP header */
167 static int hdr_sctp = FALSE;
168 static unsigned long hdr_sctp_src = 0;
169 static unsigned long hdr_sctp_dest = 0;
170 static unsigned long hdr_sctp_tag = 0;
172 /* Dummy DATA chunk header */
173 static int hdr_data_chunk = FALSE;
174 static unsigned char hdr_data_chunk_type = 0;
175 static unsigned char hdr_data_chunk_bits = 3;
176 static unsigned long hdr_data_chunk_tsn = 0;
177 static unsigned short hdr_data_chunk_sid = 0;
178 static unsigned short hdr_data_chunk_ssn = 0;
179 static unsigned long hdr_data_chunk_ppid = 0;
182 /*--- Local date -----------------------------------------------------------------*/
184 /* This is where we store the packet currently being built */
185 #define MAX_PACKET 64000
186 static unsigned char packet_buf[MAX_PACKET];
187 static unsigned long curr_offset = 0;
188 static unsigned long max_offset = MAX_PACKET;
189 static unsigned long packet_start = 0;
190 static void start_new_packet (void);
192 /* This buffer contains strings present before the packet offset 0 */
193 #define PACKET_PREAMBLE_MAX_LEN 2048
194 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
195 static int packet_preamble_len = 0;
197 /* Number of packets read and written */
198 static unsigned long num_packets_read = 0;
199 static unsigned long num_packets_written = 0;
201 /* Time code of packet, derived from packet_preamble */
202 static time_t ts_sec = 0;
203 static guint32 ts_usec = 0;
204 static char *ts_fmt = NULL;
205 static struct tm timecode_default;
208 static const char *input_filename;
209 static FILE *input_file = NULL;
211 static const char *output_filename;
212 static FILE *output_file = NULL;
214 /* Offset base to parse */
215 static unsigned long offset_base = 16;
219 /* ----- State machine -----------------------------------------------------------*/
221 /* Current state of parser */
223 INIT, /* Waiting for start of new packet */
224 START_OF_LINE, /* Starting from beginning of line */
225 READ_OFFSET, /* Just read the offset */
226 READ_BYTE, /* Just read a byte */
227 READ_TEXT /* Just read text - ignore until EOL */
229 static parser_state_t state = INIT;
231 static const char *state_str[] = {"Init",
238 static const char *token_str[] = {"",
246 /* ----- Skeleton Packet Headers --------------------------------------------------*/
254 static hdr_ethernet_t HDR_ETHERNET = {
255 {0x0a, 0x02, 0x02, 0x02, 0x02, 0x02},
256 {0x0a, 0x01, 0x01, 0x01, 0x01, 0x01},
262 guint16 packet_length;
263 guint16 identification;
268 guint16 hdr_checksum;
273 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x0101010a, 0x0202020a};
275 static struct { /* pseudo header for checksum calculation */
290 static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
304 static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};
313 static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
325 static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
327 static char tempbuf[64];
329 /*----------------------------------------------------------------------
330 * Stuff for writing a PCap file
332 #define PCAP_MAGIC 0xa1b2c3d4
334 /* "libpcap" file header (minus magic number). */
336 guint32 magic; /* magic */
337 guint16 version_major; /* major version number */
338 guint16 version_minor; /* minor version number */
339 guint32 thiszone; /* GMT to local correction */
340 guint32 sigfigs; /* accuracy of timestamps */
341 guint32 snaplen; /* max length of captured packets, in octets */
342 guint32 network; /* data link type */
345 /* "libpcap" record header. */
347 guint32 ts_sec; /* timestamp seconds */
348 guint32 ts_usec; /* timestamp microseconds */
349 guint32 incl_len; /* number of octets of packet saved in file */
350 guint32 orig_len; /* actual length of packet */
353 /* Link-layer type; see net/bpf.h for details */
354 static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
356 /*----------------------------------------------------------------------
357 * Parse a single hex number
358 * Will abort the program if it can't parse the number
359 * Pass in TRUE if this is an offset, FALSE if not
362 parse_num (const char *str, int offset)
367 num = strtoul(str, &c, offset ? offset_base : 16);
369 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
375 /*----------------------------------------------------------------------
376 * Write this byte into current packet
379 write_byte (const char *str)
383 num = parse_num(str, FALSE);
384 packet_buf[curr_offset] = (unsigned char) num;
386 if (curr_offset >= max_offset) /* packet full */
390 /*----------------------------------------------------------------------
391 * Remove bytes from the current packet
394 unwrite_bytes (unsigned long nbytes)
396 curr_offset -= nbytes;
399 /*----------------------------------------------------------------------
400 * Compute one's complement checksum (from RFC1071)
403 in_checksum (void *buf, unsigned long count)
405 unsigned long sum = 0;
409 /* This is the inner loop */
410 sum += g_ntohs(* (guint16 *) addr);
415 /* Add left-over byte, if any */
417 sum += g_ntohs(* (guint8 *) addr);
419 /* Fold 32-bit sum to 16 bits */
421 sum = (sum & 0xffff) + (sum >> 16);
427 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
428 * That code is copyrighted by D. Otis and has been modified.
431 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
432 static guint32 crc_c[256] =
434 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
435 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
436 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
437 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
438 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
439 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
440 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
441 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
442 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
443 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
444 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
445 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
446 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
447 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
448 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
449 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
450 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
451 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
452 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
453 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
454 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
455 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
456 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
457 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
458 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
459 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
460 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
461 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
462 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
463 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
464 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
465 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
466 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
467 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
468 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
469 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
470 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
471 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
472 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
473 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
474 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
475 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
476 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
477 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
478 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
479 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
480 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
481 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
482 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
483 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
484 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
485 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
486 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
487 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
488 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
489 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
490 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
491 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
492 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
493 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
494 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
495 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
496 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
497 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
501 crc32c(const guint8* buf, unsigned int len, guint32 crc32_init)
507 for (i = 0; i < len; i++)
508 CRC32C(crc32, buf[i]);
514 finalize_crc32c(guint32 crc32)
517 guint8 byte0,byte1,byte2,byte3;
520 byte0 = result & 0xff;
521 byte1 = (result>>8) & 0xff;
522 byte2 = (result>>16) & 0xff;
523 byte3 = (result>>24) & 0xff;
524 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
529 number_of_padding_bytes (unsigned long length)
531 unsigned long remainder;
533 remainder = length % 4;
538 return 4 - remainder;
541 /*----------------------------------------------------------------------
542 * Write current packet out
545 write_current_packet (void)
548 int proto_length = 0;
550 int eth_trailer_length = 0;
551 int i, padding_length;
553 struct pcaprec_hdr ph;
555 if (curr_offset > 0) {
556 /* Write the packet */
558 /* Compute packet length */
559 length = curr_offset;
560 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
561 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
562 if (hdr_udp) { length += sizeof(HDR_UDP); proto_length = length; }
563 if (hdr_tcp) { length += sizeof(HDR_TCP); proto_length = length; }
564 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
566 length += sizeof(HDR_ETHERNET);
569 eth_trailer_length = 60 - length;
574 /* Write PCAP header */
575 ph.ts_sec = (guint32)ts_sec;
576 ph.ts_usec = ts_usec;
577 if (ts_fmt == NULL) { ts_usec++; } /* fake packet counter */
578 ph.incl_len = length;
579 ph.orig_len = length;
580 fwrite(&ph, sizeof(ph), 1, output_file);
582 /* Write Ethernet header */
584 HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
585 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
588 /* Write IP header */
590 HDR_IP.packet_length = g_htons(ip_length);
591 HDR_IP.protocol = (guint8) hdr_ip_proto;
592 HDR_IP.hdr_checksum = 0;
593 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
594 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
597 /* initialize pseudo header for checksum calculation */
598 pseudoh.src_addr = HDR_IP.src_addr;
599 pseudoh.dest_addr = HDR_IP.dest_addr;
601 pseudoh.protocol = (guint8) hdr_ip_proto;
602 pseudoh.length = g_htons(proto_length);
604 /* Write UDP header */
607 HDR_UDP.source_port = g_htons(hdr_src_port);
608 HDR_UDP.dest_port = g_htons(hdr_dest_port);
609 HDR_UDP.length = g_htons(proto_length);
611 /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
612 HDR_UDP.checksum = 0;
613 x16 = in_checksum(&pseudoh, sizeof(pseudoh));
615 x16 = in_checksum(&HDR_UDP, sizeof(HDR_UDP));
617 x16 = in_checksum(packet_buf, curr_offset);
619 x16 = (u & 0xffff) + (u>>16);
620 HDR_UDP.checksum = g_htons(x16);
621 if (HDR_UDP.checksum == 0) /* differentiate between 'none' and 0 */
622 HDR_UDP.checksum = g_htons(1);
624 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
627 /* Write TCP header */
630 HDR_TCP.source_port = g_htons(hdr_src_port);
631 HDR_TCP.dest_port = g_htons(hdr_dest_port);
632 /* HDR_TCP.seq_num already correct */
633 HDR_TCP.window = g_htons(0x2000);
635 /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
636 HDR_TCP.checksum = 0;
637 x16 = in_checksum(&pseudoh, sizeof(pseudoh));
639 x16 = in_checksum(&HDR_TCP, sizeof(HDR_TCP));
641 x16 = in_checksum(packet_buf, curr_offset);
643 x16 = (u & 0xffff) + (u>>16);
644 HDR_TCP.checksum = g_htons(x16);
645 if (HDR_TCP.checksum == 0) /* differentiate between 'none' and 0 */
646 HDR_TCP.checksum = g_htons(1);
648 fwrite(&HDR_TCP, sizeof(HDR_TCP), 1, output_file);
651 /* Compute DATA chunk header and append padding */
652 if (hdr_data_chunk) {
653 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
654 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
655 HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
656 HDR_DATA_CHUNK.tsn = g_htonl(hdr_data_chunk_tsn);
657 HDR_DATA_CHUNK.sid = g_htons(hdr_data_chunk_sid);
658 HDR_DATA_CHUNK.ssn = g_htons(hdr_data_chunk_ssn);
659 HDR_DATA_CHUNK.ppid = g_htonl(hdr_data_chunk_ppid);
661 padding_length = number_of_padding_bytes(curr_offset);
662 for (i=0; i<padding_length; i++)
666 /* Write SCTP header */
669 HDR_SCTP.src_port = g_htons(hdr_sctp_src);
670 HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
671 HDR_SCTP.tag = g_htonl(hdr_sctp_tag);
672 HDR_SCTP.checksum = g_htonl(0);
673 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
675 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
676 /* Note: g_ntohl() macro arg may be eval'd twice so calc value before invoking macro */
677 x32 = finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum));
678 HDR_SCTP.checksum = g_htonl(x32);
680 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
683 /* Write DATA chunk header */
684 if (hdr_data_chunk) {
685 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
688 fwrite(packet_buf, curr_offset, 1, output_file);
690 /* Write Ethernet trailer */
691 if (hdr_ethernet && eth_trailer_length > 0) {
692 memset(tempbuf, 0, eth_trailer_length);
693 fwrite(tempbuf, eth_trailer_length, 1, output_file);
697 fprintf(stderr, "Wrote packet of %lu bytes at %u\n", curr_offset, g_ntohl(HDR_TCP.seq_num));
698 num_packets_written ++;
700 HDR_TCP.seq_num = g_ntohl(HDR_TCP.seq_num) + curr_offset;
701 HDR_TCP.seq_num = g_htonl(HDR_TCP.seq_num);
703 packet_start += curr_offset;
707 /*----------------------------------------------------------------------
708 * Write the PCap file header
711 write_file_header (void)
715 fh.magic = PCAP_MAGIC;
716 fh.version_major = 2;
717 fh.version_minor = 4;
721 fh.network = pcap_link_type;
723 fwrite(&fh, sizeof(fh), 1, output_file);
726 /*----------------------------------------------------------------------
727 * Append a token to the packet preamble.
730 append_to_preamble(char *str)
734 if (packet_preamble_len != 0) {
735 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
736 return; /* no room to add more preamble */
737 /* Add a blank separator between the previous token and this token. */
738 packet_preamble[packet_preamble_len++] = ' ';
740 toklen = strlen(str);
742 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
743 return; /* no room to add the token to the preamble */
744 g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
745 packet_preamble_len += (int) toklen;
748 char xs[PACKET_PREAMBLE_MAX_LEN];
749 g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
750 while ((c = strchr(xs, '\r')) != NULL) *c=' ';
751 fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
756 /*----------------------------------------------------------------------
757 * Parse the preamble to get the timecode.
761 parse_preamble (void)
770 * If no "-t" flag was specified, don't attempt to parse a packet
771 * preamble to extract a time stamp.
777 * Initialize to today localtime, just in case not all fields
778 * of the date and time are specified.
781 timecode = timecode_default;
785 * Null-terminate the preamble.
787 packet_preamble[packet_preamble_len] = '\0';
789 /* Ensure preamble has more than two chars before attempting to parse.
790 * This should cover line breaks etc that get counted.
792 if ( strlen(packet_preamble) > 2 ) {
793 /* Get Time leaving subseconds */
794 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
795 if (subsecs != NULL) {
796 /* Get the long time from the tm structure */
797 /* (will return -1 if failure) */
798 ts_sec = mktime( &timecode );
800 ts_sec = -1; /* we failed to parse it */
802 /* This will ensure incorrectly parsed dates get set to zero */
805 /* Sanitize - remove all '\r' */
807 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
808 fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n (defaulting to Jan 1,1970 00:00:00 GMT)\n",
809 packet_preamble, ts_fmt);
811 fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
812 timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
813 timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
815 ts_sec = 0; /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
820 /* Parse subseconds */
821 ts_usec = strtol(subsecs, &p, 10);
827 * Convert that number to a number
828 * of microseconds; if it's N digits
829 * long, it's in units of 10^(-N) seconds,
830 * so, to convert it to units of
831 * 10^-6 seconds, we multiply by
834 subseclen = (int) (p - subsecs);
837 * *More* than 6 digits; 6-N is
838 * negative, so we divide by
841 for (i = subseclen - 6; i != 0; i--)
843 } else if (subseclen < 6) {
844 for (i = 6 - subseclen; i != 0; i--)
852 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
853 fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
854 fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)ts_sec, ts_usec);
859 packet_preamble_len = 0;
862 /*----------------------------------------------------------------------
866 start_new_packet (void)
869 fprintf(stderr, "Start new packet\n");
871 /* Write out the current packet, if required */
872 write_current_packet();
875 /* Ensure we parse the packet preamble as it may contain the time */
879 /*----------------------------------------------------------------------
880 * Process a directive
883 process_directive (char *str)
885 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
889 /*----------------------------------------------------------------------
890 * Parse a single token (called from the scanner)
893 parse_token (token_t token, char *str)
898 * This is implemented as a simple state machine of five states.
899 * State transitions are caused by tokens being received from the
900 * scanner. The code should be self_documenting.
904 /* Sanitize - remove all '\r' */
906 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
908 fprintf(stderr, "(%s, %s \"%s\") -> (",
909 state_str[state], token_str[token], str ? str : "");
914 /* ----- Waiting for new packet -------------------------------------------*/
918 append_to_preamble(str);
921 process_directive(str);
924 num = parse_num(str, TRUE);
926 /* New packet starts here */
936 /* ----- Processing packet, start of new line -----------------------------*/
940 append_to_preamble(str);
943 process_directive(str);
946 num = parse_num(str, TRUE);
948 /* New packet starts here */
952 } else if ((num - packet_start) != curr_offset) {
954 * The offset we read isn't the one we expected.
955 * This may only mean that we mistakenly interpreted
956 * some text as byte values (e.g., if the text dump
957 * of packet data included a number with spaces around
958 * it). If the offset is less than what we expected,
959 * assume that's the problem, and throw away the putative
962 if (num < curr_offset) {
963 unwrite_bytes(curr_offset - num);
966 /* Bad offset; switch to INIT state */
968 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
970 write_current_packet();
981 /* ----- Processing packet, read offset -----------------------------------*/
985 /* Record the byte */
995 state = START_OF_LINE;
1002 /* ----- Processing packet, read byte -------------------------------------*/
1006 /* Record the byte */
1015 state = START_OF_LINE;
1022 /* ----- Processing packet, read text -------------------------------------*/
1026 state = START_OF_LINE;
1034 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
1039 fprintf(stderr, ", %s)\n", state_str[state]);
1043 /*----------------------------------------------------------------------
1044 * Print usage string and exit
1052 " (" SVNVERSION " from " SVNPATH ")"
1055 "Generate a capture file from an ASCII hexdump of packets.\n"
1056 "See http://www.wireshark.org for more information.\n"
1058 "Usage: text2pcap [options] <infile> <outfile>\n"
1060 "where <infile> specifies input filename (use - for standard input)\n"
1061 " <outfile> specifies output filename (use - for standard output)\n"
1064 " -o hex|oct|dec parse offsets as (h)ex, (o)ctal or (d)ecimal;\n"
1065 " default is hex.\n"
1066 " -t <timefmt> treat the text before the packet as a date/time code;\n"
1067 " the specified argument is a format string of the sort\n"
1068 " supported by strptime.\n"
1069 " Example: The time \"10:15:14.5476\" has the format code\n"
1070 " \"%%H:%%M:%%S.\"\n"
1071 " NOTE: The subsecond component delimiter, '.', must be\n"
1072 " given, but no pattern is required; the remaining\n"
1073 " number is assumed to be fractions of a second.\n"
1074 " NOTE: Date/time fields from the current date/time are\n"
1075 " used as the default for unspecified fields.\n"
1078 " -l <typenum> link-layer type number; default is 1 (Ethernet).\n"
1079 " See the file net/bpf.h for list of numbers.\n"
1080 " Use this option if your dump is a complete hex dump\n"
1081 " of an encapsulated packet and you wish to specify\n"
1082 " the exact type of encapsulation.\n"
1083 " Example: -l 7 for ARCNet packets.\n"
1084 " -m <max-packet> max packet length in output; default is %d\n"
1086 "Prepend dummy header:\n"
1087 " -e <l3pid> prepend dummy Ethernet II header with specified L3PID\n"
1089 " Example: -e 0x806 to specify an ARP packet.\n"
1090 " -i <proto> prepend dummy IP header with specified IP protocol\n"
1092 " Automatically prepends Ethernet header as well.\n"
1094 " -u <srcp>,<destp> prepend dummy UDP header with specified\n"
1095 " dest and source ports (in DECIMAL).\n"
1096 " Automatically prepends Ethernet & IP headers as well.\n"
1097 " Example: -u 1000,69 to make the packets look like\n"
1098 " TFTP/UDP packets.\n"
1099 " -T <srcp>,<destp> prepend dummy TCP header with specified\n"
1100 " dest and source ports (in DECIMAL).\n"
1101 " Automatically prepends Ethernet & IP headers as well.\n"
1102 " Example: -T 50,60\n"
1103 " -s <srcp>,<dstp>,<tag> prepend dummy SCTP header with specified\n"
1104 " dest/source ports and verification tag (in DECIMAL).\n"
1105 " Automatically prepends Ethernet & IP headers as well.\n"
1106 " Example: -s 30,40,34\n"
1107 " -S <srcp>,<dstp>,<ppi> prepend dummy SCTP header with specified\n"
1108 " dest/source ports and verification tag 0.\n"
1109 " Automatically prepends a dummy SCTP DATA\n"
1110 " chunk header with payload protocol identifier ppi.\n"
1111 " Example: -S 30,40,34\n"
1114 " -h display this help and exit.\n"
1115 " -d show detailed debug of parser states.\n"
1116 " -q generate no output at all (automatically turns off -d).\n"
1118 VERSION, MAX_PACKET);
1123 /*----------------------------------------------------------------------
1127 parse_options (int argc, char *argv[])
1133 arg_list_utf_16to8(argc, argv);
1136 /* Scan CLI parameters */
1137 while ((c = getopt(argc, argv, "dhqe:i:l:m:o:u:s:S:t:T:")) != -1) {
1139 case '?': usage(); break;
1140 case 'h': usage(); break;
1141 case 'd': if (!quiet) debug++; break;
1142 case 'q': quiet = TRUE; debug = FALSE; break;
1143 case 'l': pcap_link_type = strtol(optarg, NULL, 0); break;
1144 case 'm': max_offset = strtol(optarg, NULL, 0); break;
1146 if (optarg[0]!='h' && optarg[0] != 'o' && optarg[0] != 'd') {
1147 fprintf(stderr, "Bad argument for '-o': %s\n", optarg);
1151 case 'o': offset_base = 8; break;
1152 case 'h': offset_base = 16; break;
1153 case 'd': offset_base = 10; break;
1157 hdr_ethernet = TRUE;
1158 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
1159 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1166 hdr_ip_proto = strtol(optarg, &p, 10);
1167 if (p == optarg || *p != '\0' || hdr_ip_proto < 0 ||
1168 hdr_ip_proto > 255) {
1169 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1172 hdr_ethernet = TRUE;
1173 hdr_ethernet_proto = 0x800;
1178 hdr_sctp_src = strtol(optarg, &p, 10);
1179 if (p == optarg || (*p != ',' && *p != '\0')) {
1180 fprintf(stderr, "Bad src port for '-%c'\n", c);
1184 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1189 hdr_sctp_dest = strtol(optarg, &p, 10);
1190 if (p == optarg || (*p != ',' && *p != '\0')) {
1191 fprintf(stderr, "Bad dest port for '-s'\n");
1195 fprintf(stderr, "No tag specified for '-%c'\n", c);
1200 hdr_sctp_tag = strtol(optarg, &p, 10);
1201 if (p == optarg || *p != '\0') {
1202 fprintf(stderr, "Bad tag for '-%c'\n", c);
1208 hdr_ethernet = TRUE;
1209 hdr_ethernet_proto = 0x800;
1213 hdr_data_chunk = TRUE;
1214 hdr_sctp_src = strtol(optarg, &p, 10);
1215 if (p == optarg || (*p != ',' && *p != '\0')) {
1216 fprintf(stderr, "Bad src port for '-%c'\n", c);
1220 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1225 hdr_sctp_dest = strtol(optarg, &p, 10);
1226 if (p == optarg || (*p != ',' && *p != '\0')) {
1227 fprintf(stderr, "Bad dest port for '-s'\n");
1231 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1236 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1237 if (p == optarg || *p != '\0') {
1238 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1244 hdr_ethernet = TRUE;
1245 hdr_ethernet_proto = 0x800;
1255 hdr_src_port = strtol(optarg, &p, 10);
1256 if (p == optarg || (*p != ',' && *p != '\0')) {
1257 fprintf(stderr, "Bad src port for '-u'\n");
1261 fprintf(stderr, "No dest port specified for '-u'\n");
1266 hdr_dest_port = strtol(optarg, &p, 10);
1267 if (p == optarg || *p != '\0') {
1268 fprintf(stderr, "Bad dest port for '-u'\n");
1273 hdr_ethernet = TRUE;
1274 hdr_ethernet_proto = 0x800;
1280 hdr_src_port = strtol(optarg, &p, 10);
1281 if (p == optarg || (*p != ',' && *p != '\0')) {
1282 fprintf(stderr, "Bad src port for '-T'\n");
1286 fprintf(stderr, "No dest port specified for '-u'\n");
1291 hdr_dest_port = strtol(optarg, &p, 10);
1292 if (p == optarg || *p != '\0') {
1293 fprintf(stderr, "Bad dest port for '-T'\n");
1298 hdr_ethernet = TRUE;
1299 hdr_ethernet_proto = 0x800;
1307 if (optind >= argc || argc-optind < 2) {
1308 fprintf(stderr, "Must specify input and output filename\n");
1312 if (strcmp(argv[optind], "-")) {
1313 input_filename = g_strdup(argv[optind]);
1314 input_file = ws_fopen(input_filename, "rb");
1316 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1317 input_filename, g_strerror(errno));
1321 input_filename = "Standard input";
1325 if (strcmp(argv[optind+1], "-")) {
1326 output_filename = g_strdup(argv[optind+1]);
1327 output_file = ws_fopen(output_filename, "wb");
1329 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1330 output_filename, g_strerror(errno));
1334 output_filename = "Standard output";
1335 output_file = stdout;
1338 /* Some validation */
1339 if (pcap_link_type != 1 && hdr_ethernet) {
1340 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S -T) cannot be specified with link type override (-l)\n");
1344 /* Set up our variables */
1347 input_filename = "Standard input";
1350 output_file = stdout;
1351 output_filename = "Standard output";
1354 ts_sec = time(0); /* initialize to current time */
1355 timecode_default = *localtime(&ts_sec);
1356 timecode_default.tm_isdst = -1; /* Unknown for now, depends on time given to the strptime() function */
1358 /* Display summary of our state */
1360 fprintf(stderr, "Input from: %s\n", input_filename);
1361 fprintf(stderr, "Output to: %s\n", output_filename);
1363 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1364 hdr_ethernet_proto);
1365 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1367 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1368 hdr_src_port, hdr_dest_port);
1369 if (hdr_tcp) fprintf(stderr, "Generate dummy TCP header: Source port: %ld. Dest port: %ld\n",
1370 hdr_src_port, hdr_dest_port);
1371 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1372 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1373 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1374 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1379 main(int argc, char *argv[])
1381 parse_options(argc, argv);
1383 assert(input_file != NULL);
1384 assert(output_file != NULL);
1386 write_file_header();
1391 write_current_packet();
1393 fprintf(stderr, "\n-------------------------\n");
1395 fprintf(stderr, "Read %ld potential packet%s, wrote %ld packet%s\n",
1396 num_packets_read, (num_packets_read==1) ?"":"s",
1397 num_packets_written, (num_packets_written==1)?"":"s");