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 signalled 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>
131 #include "wsgetopt.h"
134 #ifdef NEED_STRPTIME_H
135 # include "strptime.h"
138 #include "text2pcap.h"
140 /*--- Options --------------------------------------------------------------------*/
143 static int debug = 0;
145 static int quiet = FALSE;
147 /* Dummy Ethernet header */
148 static int hdr_ethernet = FALSE;
149 static unsigned long hdr_ethernet_proto = 0;
151 /* Dummy IP header */
152 static int hdr_ip = FALSE;
153 static long hdr_ip_proto = 0;
155 /* Dummy UDP header */
156 static int hdr_udp = FALSE;
157 static unsigned long hdr_dest_port = 0;
158 static unsigned long hdr_src_port = 0;
160 /* Dummy TCP header */
161 static int hdr_tcp = FALSE;
163 /* Dummy SCTP header */
164 static int hdr_sctp = FALSE;
165 static unsigned long hdr_sctp_src = 0;
166 static unsigned long hdr_sctp_dest = 0;
167 static unsigned long hdr_sctp_tag = 0;
169 /* Dummy DATA chunk header */
170 static int hdr_data_chunk = FALSE;
171 static unsigned char hdr_data_chunk_type = 0;
172 static unsigned char hdr_data_chunk_bits = 3;
173 static unsigned long hdr_data_chunk_tsn = 0;
174 static unsigned short hdr_data_chunk_sid = 0;
175 static unsigned short hdr_data_chunk_ssn = 0;
176 static unsigned long hdr_data_chunk_ppid = 0;
179 /*--- Local date -----------------------------------------------------------------*/
181 /* This is where we store the packet currently being built */
182 #define MAX_PACKET 64000
183 static unsigned char packet_buf[MAX_PACKET];
184 static unsigned long curr_offset = 0;
185 static unsigned long max_offset = MAX_PACKET;
186 static unsigned long packet_start = 0;
187 static void start_new_packet (void);
189 /* This buffer contains strings present before the packet offset 0 */
190 #define PACKET_PREAMBLE_MAX_LEN 2048
191 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
192 static int packet_preamble_len = 0;
194 /* Number of packets read and written */
195 static unsigned long num_packets_read = 0;
196 static unsigned long num_packets_written = 0;
198 /* Time code of packet, derived from packet_preamble */
199 static time_t ts_sec = 0;
200 static guint32 ts_usec = 0;
201 static char *ts_fmt = NULL;
202 static struct tm timecode_default;
205 static const char *input_filename;
206 static FILE *input_file = NULL;
208 static const char *output_filename;
209 static FILE *output_file = NULL;
211 /* Offset base to parse */
212 static unsigned long offset_base = 16;
216 /* ----- State machine -----------------------------------------------------------*/
218 /* Current state of parser */
220 INIT, /* Waiting for start of new packet */
221 START_OF_LINE, /* Starting from beginning of line */
222 READ_OFFSET, /* Just read the offset */
223 READ_BYTE, /* Just read a byte */
224 READ_TEXT /* Just read text - ignore until EOL */
226 static parser_state_t state = INIT;
228 static const char *state_str[] = {"Init",
235 static const char *token_str[] = {"",
243 /* ----- Skeleton Packet Headers --------------------------------------------------*/
251 static hdr_ethernet_t HDR_ETHERNET = {
252 {0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
253 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
259 guint16 packet_length;
260 guint16 identification;
265 guint16 hdr_checksum;
270 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
272 static struct { /* pseudo header for checksum calculation */
287 static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
301 static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};
310 static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
322 static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
324 static char tempbuf[64];
326 /*----------------------------------------------------------------------
327 * Stuff for writing a PCap file
329 #define PCAP_MAGIC 0xa1b2c3d4
331 /* "libpcap" file header (minus magic number). */
333 guint32 magic; /* magic */
334 guint16 version_major; /* major version number */
335 guint16 version_minor; /* minor version number */
336 guint32 thiszone; /* GMT to local correction */
337 guint32 sigfigs; /* accuracy of timestamps */
338 guint32 snaplen; /* max length of captured packets, in octets */
339 guint32 network; /* data link type */
342 /* "libpcap" record header. */
344 guint32 ts_sec; /* timestamp seconds */
345 guint32 ts_usec; /* timestamp microseconds */
346 guint32 incl_len; /* number of octets of packet saved in file */
347 guint32 orig_len; /* actual length of packet */
350 /* Link-layer type; see net/bpf.h for details */
351 static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
353 /*----------------------------------------------------------------------
354 * Parse a single hex number
355 * Will abort the program if it can't parse the number
356 * Pass in TRUE if this is an offset, FALSE if not
359 parse_num (const char *str, int offset)
364 num = strtoul(str, &c, offset ? offset_base : 16);
366 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
372 /*----------------------------------------------------------------------
373 * Write this byte into current packet
376 write_byte (const char *str)
380 num = parse_num(str, FALSE);
381 packet_buf[curr_offset] = (unsigned char) num;
383 if (curr_offset >= max_offset) /* packet full */
387 /*----------------------------------------------------------------------
388 * Remove bytes from the current packet
391 unwrite_bytes (unsigned long nbytes)
393 curr_offset -= nbytes;
396 /*----------------------------------------------------------------------
397 * Compute one's complement checksum (from RFC1071)
400 in_checksum (void *buf, unsigned long count)
402 unsigned long sum = 0;
406 /* This is the inner loop */
407 sum += g_ntohs(* (guint16 *) addr);
412 /* Add left-over byte, if any */
414 sum += g_ntohs(* (guint8 *) addr);
416 /* Fold 32-bit sum to 16 bits */
418 sum = (sum & 0xffff) + (sum >> 16);
420 return g_htons(~sum);
423 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
424 * That code is copyrighted by D. Otis and has been modified.
427 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
428 static guint32 crc_c[256] =
430 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
431 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
432 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
433 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
434 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
435 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
436 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
437 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
438 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
439 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
440 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
441 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
442 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
443 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
444 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
445 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
446 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
447 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
448 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
449 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
450 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
451 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
452 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
453 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
454 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
455 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
456 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
457 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
458 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
459 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
460 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
461 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
462 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
463 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
464 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
465 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
466 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
467 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
468 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
469 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
470 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
471 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
472 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
473 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
474 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
475 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
476 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
477 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
478 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
479 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
480 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
481 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
482 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
483 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
484 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
485 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
486 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
487 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
488 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
489 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
490 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
491 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
492 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
493 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
497 crc32c(const guint8* buf, unsigned int len, guint32 crc32_init)
503 for (i = 0; i < len; i++)
504 CRC32C(crc32, buf[i]);
510 finalize_crc32c(guint32 crc32)
513 guint8 byte0,byte1,byte2,byte3;
516 byte0 = result & 0xff;
517 byte1 = (result>>8) & 0xff;
518 byte2 = (result>>16) & 0xff;
519 byte3 = (result>>24) & 0xff;
520 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
525 number_of_padding_bytes (unsigned long length)
527 unsigned long remainder;
529 remainder = length % 4;
534 return 4 - remainder;
537 /*----------------------------------------------------------------------
538 * Write current packet out
541 write_current_packet (void)
544 int proto_length = 0;
546 int eth_trailer_length = 0;
547 int i, padding_length;
549 struct pcaprec_hdr ph;
551 if (curr_offset > 0) {
552 /* Write the packet */
554 /* Compute packet length */
555 length = curr_offset;
556 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
557 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
558 if (hdr_udp) { length += sizeof(HDR_UDP); proto_length = length; }
559 if (hdr_tcp) { length += sizeof(HDR_TCP); proto_length = length; }
560 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
562 length += sizeof(HDR_ETHERNET);
565 eth_trailer_length = 60 - length;
570 /* Write PCAP header */
571 ph.ts_sec = (guint32)ts_sec;
572 ph.ts_usec = ts_usec;
573 if (ts_fmt == NULL) { ts_usec++; } /* fake packet counter */
574 ph.incl_len = length;
575 ph.orig_len = length;
576 fwrite(&ph, sizeof(ph), 1, output_file);
578 /* Write Ethernet header */
580 HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
581 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
584 /* Write IP header */
586 HDR_IP.packet_length = g_htons(ip_length);
587 HDR_IP.protocol = (guint8) hdr_ip_proto;
588 HDR_IP.hdr_checksum = 0;
589 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
590 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
593 /* initialize pseudo header for checksum calculation */
594 pseudoh.src_addr = HDR_IP.src_addr;
595 pseudoh.dest_addr = HDR_IP.dest_addr;
597 pseudoh.protocol = (guint8) hdr_ip_proto;
598 pseudoh.length = g_htons(proto_length);
600 /* Write UDP header */
602 HDR_UDP.source_port = g_htons(hdr_src_port);
603 HDR_UDP.dest_port = g_htons(hdr_dest_port);
604 HDR_UDP.length = g_htons(proto_length);
606 HDR_UDP.checksum = 0;
607 u = g_ntohs(in_checksum(&pseudoh, sizeof(pseudoh))) +
608 g_ntohs(in_checksum(&HDR_UDP, sizeof(HDR_UDP))) +
609 g_ntohs(in_checksum(packet_buf, curr_offset));
610 HDR_UDP.checksum = g_htons((u & 0xffff) + (u>>16));
611 if (HDR_UDP.checksum == 0) /* differenciate between 'none' and 0 */
612 HDR_UDP.checksum = g_htons(1);
614 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
617 /* Write TCP header */
619 HDR_TCP.source_port = g_htons(hdr_src_port);
620 HDR_TCP.dest_port = g_htons(hdr_dest_port);
621 /* HDR_TCP.seq_num already correct */
622 HDR_TCP.window = g_htons(0x2000);
624 HDR_TCP.checksum = 0;
625 u = g_ntohs(in_checksum(&pseudoh, sizeof(pseudoh))) +
626 g_ntohs(in_checksum(&HDR_TCP, sizeof(HDR_TCP))) +
627 g_ntohs(in_checksum(packet_buf, curr_offset));
628 HDR_TCP.checksum = g_htons((u & 0xffff) + (u>>16));
629 if (HDR_TCP.checksum == 0) /* differenciate between 'none' and 0 */
630 HDR_TCP.checksum = g_htons(1);
632 fwrite(&HDR_TCP, sizeof(HDR_TCP), 1, output_file);
635 /* Compute DATA chunk header and append padding */
636 if (hdr_data_chunk) {
637 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
638 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
639 HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
640 HDR_DATA_CHUNK.tsn = g_htonl(hdr_data_chunk_tsn);
641 HDR_DATA_CHUNK.sid = g_htons(hdr_data_chunk_sid);
642 HDR_DATA_CHUNK.ssn = g_htons(hdr_data_chunk_ssn);
643 HDR_DATA_CHUNK.ppid = g_htonl(hdr_data_chunk_ppid);
645 padding_length = number_of_padding_bytes(curr_offset);
646 for (i=0; i<padding_length; i++)
650 /* Write SCTP header */
652 HDR_SCTP.src_port = g_htons(hdr_sctp_src);
653 HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
654 HDR_SCTP.tag = g_htonl(hdr_sctp_tag);
655 HDR_SCTP.checksum = g_htonl(0);
656 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
658 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
659 HDR_SCTP.checksum = g_htonl(finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum)));
661 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
664 /* Write DATA chunk header */
665 if (hdr_data_chunk) {
666 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
669 fwrite(packet_buf, curr_offset, 1, output_file);
671 /* Write Ethernet trailer */
672 if (hdr_ethernet && eth_trailer_length > 0) {
673 memset(tempbuf, 0, eth_trailer_length);
674 fwrite(tempbuf, eth_trailer_length, 1, output_file);
678 fprintf(stderr, "Wrote packet of %lu bytes at %u\n", curr_offset, g_ntohl(HDR_TCP.seq_num));
679 num_packets_written ++;
682 HDR_TCP.seq_num = g_htonl(g_ntohl(HDR_TCP.seq_num) + curr_offset);
684 packet_start += curr_offset;
688 /*----------------------------------------------------------------------
689 * Write the PCap file header
692 write_file_header (void)
696 fh.magic = PCAP_MAGIC;
697 fh.version_major = 2;
698 fh.version_minor = 4;
702 fh.network = pcap_link_type;
704 fwrite(&fh, sizeof(fh), 1, output_file);
707 /*----------------------------------------------------------------------
708 * Append a token to the packet preamble.
711 append_to_preamble(char *str)
715 if (packet_preamble_len != 0) {
716 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
717 return; /* no room to add more preamble */
718 /* Add a blank separator between the previous token and this token. */
719 packet_preamble[packet_preamble_len++] = ' ';
721 toklen = strlen(str);
723 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
724 return; /* no room to add the token to the preamble */
725 g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
726 packet_preamble_len += (int) toklen;
729 char xs[PACKET_PREAMBLE_MAX_LEN];
730 g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
731 while ((c = strchr(xs, '\r')) != NULL) *c=' ';
732 fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
737 /*----------------------------------------------------------------------
738 * Parse the preamble to get the timecode.
742 parse_preamble (void)
751 * If no "-t" flag was specified, don't attempt to parse a packet
752 * preamble to extract a time stamp.
758 * Initialize to today localtime, just in case not all fields
759 * of the date and time are specified.
762 timecode = timecode_default;
766 * Null-terminate the preamble.
768 packet_preamble[packet_preamble_len] = '\0';
770 /* Ensure preamble has more than two chars before atempting to parse.
771 * This should cover line breaks etc that get counted.
773 if ( strlen(packet_preamble) > 2 ) {
774 /* Get Time leaving subseconds */
775 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
776 if (subsecs != NULL) {
777 /* Get the long time from the tm structure */
778 /* (will return -1 if failure) */
779 ts_sec = mktime( &timecode );
781 ts_sec = -1; /* we failed to parse it */
783 /* This will ensure incorrectly parsed dates get set to zero */
786 /* Sanitize - remove all '\r' */
788 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
789 fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n (defaulting to Jan 1,1970 00:00:00 GMT)\n",
790 packet_preamble, ts_fmt);
792 fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
793 timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
794 timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
796 ts_sec = 0; /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
801 /* Parse subseconds */
802 ts_usec = strtol(subsecs, &p, 10);
808 * Convert that number to a number
809 * of microseconds; if it's N digits
810 * long, it's in units of 10^(-N) seconds,
811 * so, to convert it to units of
812 * 10^-6 seconds, we multiply by
815 subseclen = (int) (p - subsecs);
818 * *More* than 6 digits; 6-N is
819 * negative, so we divide by
822 for (i = subseclen - 6; i != 0; i--)
824 } else if (subseclen < 6) {
825 for (i = 6 - subseclen; i != 0; i--)
833 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
834 fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
835 fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)ts_sec, ts_usec);
840 packet_preamble_len = 0;
843 /*----------------------------------------------------------------------
847 start_new_packet (void)
850 fprintf(stderr, "Start new packet\n");
852 /* Write out the current packet, if required */
853 write_current_packet();
856 /* Ensure we parse the packet preamble as it may contain the time */
860 /*----------------------------------------------------------------------
861 * Process a directive
864 process_directive (char *str)
866 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
870 /*----------------------------------------------------------------------
871 * Parse a single token (called from the scanner)
874 parse_token (token_t token, char *str)
879 * This is implemented as a simple state machine of five states.
880 * State transitions are caused by tokens being received from the
881 * scanner. The code should be self_documenting.
885 /* Sanitize - remove all '\r' */
887 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
889 fprintf(stderr, "(%s, %s \"%s\") -> (",
890 state_str[state], token_str[token], str ? str : "");
895 /* ----- Waiting for new packet -------------------------------------------*/
899 append_to_preamble(str);
902 process_directive(str);
905 num = parse_num(str, TRUE);
907 /* New packet starts here */
917 /* ----- Processing packet, start of new line -----------------------------*/
921 append_to_preamble(str);
924 process_directive(str);
927 num = parse_num(str, TRUE);
929 /* New packet starts here */
933 } else if ((num - packet_start) != curr_offset) {
935 * The offset we read isn't the one we expected.
936 * This may only mean that we mistakenly interpreted
937 * some text as byte values (e.g., if the text dump
938 * of packet data included a number with spaces around
939 * it). If the offset is less than what we expected,
940 * assume that's the problem, and throw away the putative
943 if (num < curr_offset) {
944 unwrite_bytes(curr_offset - num);
947 /* Bad offset; switch to INIT state */
949 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
951 write_current_packet();
962 /* ----- Processing packet, read offset -----------------------------------*/
966 /* Record the byte */
976 state = START_OF_LINE;
983 /* ----- Processing packet, read byte -------------------------------------*/
987 /* Record the byte */
996 state = START_OF_LINE;
1003 /* ----- Processing packet, read text -------------------------------------*/
1007 state = START_OF_LINE;
1015 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
1020 fprintf(stderr, ", %s)\n", state_str[state]);
1024 /*----------------------------------------------------------------------
1025 * Print usage string and exit
1033 " (" SVNVERSION " from " SVNPATH ")"
1036 "Generate a capture file from an ASCII hexdump of packets.\n"
1037 "See http://www.wireshark.org for more information.\n"
1039 "Usage: text2pcap [options] <infile> <outfile>\n"
1041 "where <infile> specifies input filename (use - for standard input)\n"
1042 " <outfile> specifies output filename (use - for standard output)\n"
1045 " -o hex|oct|dec parse offsets as (h)ex, (o)ctal or (d)ecimal; default is hex.\n"
1046 " -t <timefmt> treat the text before the packet as a date/time code;\n"
1047 " the specified argument is a format string of the sort\n"
1048 " supported by strptime.\n"
1049 " Example: The time \"10:15:14.5476\" has the format code\n"
1050 " \"%%H:%%M:%%S.\"\n"
1051 " NOTE: The subsecond component delimiter must be given\n"
1052 " (.) but no pattern is required; the remaining number\n"
1053 " is assumed to be fractions of a second.\n"
1054 " NOTE: Date/time fields from the current date/time are\n"
1055 " used as the default for unspecified fields.\n"
1058 " -l <typenum> link-layer type number; default is 1 (Ethernet).\n"
1059 " See the file net/bpf.h for list of numbers.\n"
1060 " Use this option if your dump is a complete hex dump\n"
1061 " of an encapsulated packet and you wish to specify\n"
1062 " the exact type of encapsulation.\n"
1063 " Example: -l 7 for ARCNet packets.\n"
1064 " -m <max-packet> max packet length in output; default is %d\n"
1066 "Prepend dummy header:\n"
1067 " -e <l3pid> prepend dummy Ethernet II header with specified L3PID\n"
1069 " Example: -e 0x806 to specify an ARP packet.\n"
1070 " -i <proto> prepend dummy IP header with specified IP protocol\n"
1072 " Automatically prepends Ethernet header as well.\n"
1074 " -u <srcp>,<destp> prepend dummy UDP header with specified\n"
1075 " dest and source ports (in DECIMAL).\n"
1076 " Automatically prepends Ethernet & IP headers as well.\n"
1077 " Example: -u 1000 69 to make the packets look like TFTP/UDP packets.\n"
1078 " -T <srcp>,<destp> prepend dummy TCP header with specified\n"
1079 " dest and source ports (in DECIMAL).\n"
1080 " Automatically prepends Ethernet & IP headers as well.\n"
1081 " Example: -T 50,60\n"
1082 " -s <srcp>,<dstp>,<tag> prepend dummy SCTP header with specified\n"
1083 " dest/source ports and verification tag (in DECIMAL).\n"
1084 " Automatically prepends Ethernet & IP headers as well.\n"
1085 " Example: -s 30,40,34\n"
1086 " -S <srcp>,<dstp>,<ppi> prepend dummy SCTP header with specified\n"
1087 " dest/source ports and verification tag 0.\n"
1088 " Automatically prepends a dummy SCTP DATA\n"
1089 " chunk header with payload protocol identifier ppi.\n"
1090 " Example: -S 30,40,34\n"
1093 " -h display this help and exit.\n"
1094 " -d show detailed debug of parser states.\n"
1095 " -q generate no output at all (automatically turns off -d).\n"
1097 VERSION, MAX_PACKET);
1102 /*----------------------------------------------------------------------
1106 parse_options (int argc, char *argv[])
1111 /* Scan CLI parameters */
1112 while ((c = getopt(argc, argv, "dhqe:i:l:m:o:u:s:S:t:T:")) != -1) {
1114 case '?': usage(); break;
1115 case 'h': usage(); break;
1116 case 'd': if (!quiet) debug++; break;
1117 case 'q': quiet = TRUE; debug = FALSE; break;
1118 case 'l': pcap_link_type = strtol(optarg, NULL, 0); break;
1119 case 'm': max_offset = strtol(optarg, NULL, 0); break;
1121 if (optarg[0]!='h' && optarg[0] != 'o' && optarg[0] != 'd') {
1122 fprintf(stderr, "Bad argument for '-o': %s\n", optarg);
1126 case 'o': offset_base = 8; break;
1127 case 'h': offset_base = 16; break;
1128 case 'd': offset_base = 10; break;
1132 hdr_ethernet = TRUE;
1133 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
1134 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1141 hdr_ip_proto = strtol(optarg, &p, 10);
1142 if (p == optarg || *p != '\0' || hdr_ip_proto < 0 ||
1143 hdr_ip_proto > 255) {
1144 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1147 hdr_ethernet = TRUE;
1148 hdr_ethernet_proto = 0x800;
1153 hdr_sctp_src = strtol(optarg, &p, 10);
1154 if (p == optarg || (*p != ',' && *p != '\0')) {
1155 fprintf(stderr, "Bad src port for '-%c'\n", c);
1159 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1164 hdr_sctp_dest = strtol(optarg, &p, 10);
1165 if (p == optarg || (*p != ',' && *p != '\0')) {
1166 fprintf(stderr, "Bad dest port for '-s'\n");
1170 fprintf(stderr, "No tag specified for '-%c'\n", c);
1175 hdr_sctp_tag = strtol(optarg, &p, 10);
1176 if (p == optarg || *p != '\0') {
1177 fprintf(stderr, "Bad tag for '-%c'\n", c);
1183 hdr_ethernet = TRUE;
1184 hdr_ethernet_proto = 0x800;
1188 hdr_data_chunk = TRUE;
1189 hdr_sctp_src = strtol(optarg, &p, 10);
1190 if (p == optarg || (*p != ',' && *p != '\0')) {
1191 fprintf(stderr, "Bad src port for '-%c'\n", c);
1195 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1200 hdr_sctp_dest = strtol(optarg, &p, 10);
1201 if (p == optarg || (*p != ',' && *p != '\0')) {
1202 fprintf(stderr, "Bad dest port for '-s'\n");
1206 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1211 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1212 if (p == optarg || *p != '\0') {
1213 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1219 hdr_ethernet = TRUE;
1220 hdr_ethernet_proto = 0x800;
1230 hdr_src_port = strtol(optarg, &p, 10);
1231 if (p == optarg || (*p != ',' && *p != '\0')) {
1232 fprintf(stderr, "Bad src port for '-u'\n");
1236 fprintf(stderr, "No dest port specified for '-u'\n");
1241 hdr_dest_port = strtol(optarg, &p, 10);
1242 if (p == optarg || *p != '\0') {
1243 fprintf(stderr, "Bad dest port for '-u'\n");
1248 hdr_ethernet = TRUE;
1249 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 '-T'\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 '-T'\n");
1273 hdr_ethernet = TRUE;
1274 hdr_ethernet_proto = 0x800;
1282 if (optind >= argc || argc-optind < 2) {
1283 fprintf(stderr, "Must specify input and output filename\n");
1287 if (strcmp(argv[optind], "-")) {
1288 input_filename = g_strdup(argv[optind]);
1289 input_file = ws_fopen(input_filename, "rb");
1291 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1292 input_filename, strerror(errno));
1296 input_filename = "Standard input";
1300 if (strcmp(argv[optind+1], "-")) {
1301 output_filename = g_strdup(argv[optind+1]);
1302 output_file = ws_fopen(output_filename, "wb");
1304 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1305 output_filename, strerror(errno));
1309 output_filename = "Standard output";
1310 output_file = stdout;
1313 /* Some validation */
1314 if (pcap_link_type != 1 && hdr_ethernet) {
1315 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S -T) cannot be specified with link type override (-l)\n");
1319 /* Set up our variables */
1322 input_filename = "Standard input";
1325 output_file = stdout;
1326 output_filename = "Standard output";
1329 ts_sec = time(0); /* initialize to current time */
1330 timecode_default = *localtime(&ts_sec);
1331 timecode_default.tm_isdst = -1; /* Unknown for now, depends on time given to the strptime() function */
1333 /* Display summary of our state */
1335 fprintf(stderr, "Input from: %s\n", input_filename);
1336 fprintf(stderr, "Output to: %s\n", output_filename);
1338 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1339 hdr_ethernet_proto);
1340 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1342 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1343 hdr_src_port, hdr_dest_port);
1344 if (hdr_tcp) fprintf(stderr, "Generate dummy TCP header: Source port: %ld. Dest port: %ld\n",
1345 hdr_src_port, hdr_dest_port);
1346 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1347 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1348 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1349 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1353 int main(int argc, char *argv[])
1355 parse_options(argc, argv);
1357 assert(input_file != NULL);
1358 assert(output_file != NULL);
1360 write_file_header();
1365 write_current_packet();
1367 fprintf(stderr, "\n-------------------------\n");
1369 fprintf(stderr, "Read %ld potential packet%s, wrote %ld packet%s\n",
1370 num_packets_read, (num_packets_read==1) ?"":"s",
1371 num_packets_written, (num_packets_written==1)?"":"s");