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>
131 #include "wsutil/wsgetopt.h"
134 #ifdef NEED_STRPTIME_H
135 # include "wsutil/strptime.h"
138 #include "text2pcap.h"
139 #include "svnversion.h"
142 #include <wsutil/unicode-utils.h>
145 /*--- Options --------------------------------------------------------------------*/
148 static int debug = 0;
150 static int quiet = FALSE;
152 /* Dummy Ethernet header */
153 static int hdr_ethernet = FALSE;
154 static unsigned long hdr_ethernet_proto = 0;
156 /* Dummy IP header */
157 static int hdr_ip = FALSE;
158 static long hdr_ip_proto = 0;
160 /* Dummy UDP header */
161 static int hdr_udp = FALSE;
162 static unsigned long hdr_dest_port = 0;
163 static unsigned long hdr_src_port = 0;
165 /* Dummy TCP header */
166 static int hdr_tcp = FALSE;
168 /* Dummy SCTP header */
169 static int hdr_sctp = FALSE;
170 static unsigned long hdr_sctp_src = 0;
171 static unsigned long hdr_sctp_dest = 0;
172 static unsigned long hdr_sctp_tag = 0;
174 /* Dummy DATA chunk header */
175 static int hdr_data_chunk = FALSE;
176 static unsigned char hdr_data_chunk_type = 0;
177 static unsigned char hdr_data_chunk_bits = 3;
178 static unsigned long hdr_data_chunk_tsn = 0;
179 static unsigned short hdr_data_chunk_sid = 0;
180 static unsigned short hdr_data_chunk_ssn = 0;
181 static unsigned long hdr_data_chunk_ppid = 0;
184 /*--- Local date -----------------------------------------------------------------*/
186 /* This is where we store the packet currently being built */
187 #define MAX_PACKET 64000
188 static unsigned char packet_buf[MAX_PACKET];
189 static unsigned long curr_offset = 0;
190 static unsigned long max_offset = MAX_PACKET;
191 static unsigned long packet_start = 0;
192 static void start_new_packet (void);
194 /* This buffer contains strings present before the packet offset 0 */
195 #define PACKET_PREAMBLE_MAX_LEN 2048
196 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
197 static int packet_preamble_len = 0;
199 /* Number of packets read and written */
200 static unsigned long num_packets_read = 0;
201 static unsigned long num_packets_written = 0;
203 /* Time code of packet, derived from packet_preamble */
204 static time_t ts_sec = 0;
205 static guint32 ts_usec = 0;
206 static char *ts_fmt = NULL;
207 static struct tm timecode_default;
210 static const char *input_filename;
211 static FILE *input_file = NULL;
213 static const char *output_filename;
214 static FILE *output_file = NULL;
216 /* Offset base to parse */
217 static unsigned long offset_base = 16;
221 /* ----- State machine -----------------------------------------------------------*/
223 /* Current state of parser */
225 INIT, /* Waiting for start of new packet */
226 START_OF_LINE, /* Starting from beginning of line */
227 READ_OFFSET, /* Just read the offset */
228 READ_BYTE, /* Just read a byte */
229 READ_TEXT /* Just read text - ignore until EOL */
231 static parser_state_t state = INIT;
233 static const char *state_str[] = {"Init",
240 static const char *token_str[] = {"",
248 /* ----- Skeleton Packet Headers --------------------------------------------------*/
256 static hdr_ethernet_t HDR_ETHERNET = {
257 {0x0a, 0x02, 0x02, 0x02, 0x02, 0x02},
258 {0x0a, 0x01, 0x01, 0x01, 0x01, 0x01},
264 guint16 packet_length;
265 guint16 identification;
270 guint16 hdr_checksum;
275 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x0101010a, 0x0202020a};
277 static struct { /* pseudo header for checksum calculation */
292 static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
306 static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};
315 static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
327 static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
329 static char tempbuf[64];
331 /*----------------------------------------------------------------------
332 * Stuff for writing a PCap file
334 #define PCAP_MAGIC 0xa1b2c3d4
336 /* "libpcap" file header (minus magic number). */
338 guint32 magic; /* magic */
339 guint16 version_major; /* major version number */
340 guint16 version_minor; /* minor version number */
341 guint32 thiszone; /* GMT to local correction */
342 guint32 sigfigs; /* accuracy of timestamps */
343 guint32 snaplen; /* max length of captured packets, in octets */
344 guint32 network; /* data link type */
347 /* "libpcap" record header. */
349 guint32 ts_sec; /* timestamp seconds */
350 guint32 ts_usec; /* timestamp microseconds */
351 guint32 incl_len; /* number of octets of packet saved in file */
352 guint32 orig_len; /* actual length of packet */
355 /* Link-layer type; see net/bpf.h for details */
356 static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
358 /*----------------------------------------------------------------------
359 * Parse a single hex number
360 * Will abort the program if it can't parse the number
361 * Pass in TRUE if this is an offset, FALSE if not
364 parse_num (const char *str, int offset)
369 num = strtoul(str, &c, offset ? offset_base : 16);
371 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
377 /*----------------------------------------------------------------------
378 * Write this byte into current packet
381 write_byte (const char *str)
385 num = parse_num(str, FALSE);
386 packet_buf[curr_offset] = (unsigned char) num;
388 if (curr_offset >= max_offset) /* packet full */
392 /*----------------------------------------------------------------------
393 * Remove bytes from the current packet
396 unwrite_bytes (unsigned long nbytes)
398 curr_offset -= nbytes;
401 /*----------------------------------------------------------------------
402 * Compute one's complement checksum (from RFC1071)
405 in_checksum (void *buf, unsigned long count)
407 unsigned long sum = 0;
411 /* This is the inner loop */
412 sum += g_ntohs(* (guint16 *) addr);
417 /* Add left-over byte, if any */
419 sum += g_ntohs(* (guint8 *) addr);
421 /* Fold 32-bit sum to 16 bits */
423 sum = (sum & 0xffff) + (sum >> 16);
429 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
430 * That code is copyrighted by D. Otis and has been modified.
433 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
434 static guint32 crc_c[256] =
436 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
437 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
438 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
439 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
440 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
441 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
442 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
443 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
444 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
445 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
446 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
447 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
448 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
449 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
450 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
451 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
452 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
453 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
454 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
455 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
456 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
457 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
458 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
459 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
460 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
461 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
462 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
463 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
464 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
465 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
466 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
467 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
468 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
469 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
470 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
471 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
472 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
473 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
474 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
475 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
476 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
477 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
478 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
479 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
480 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
481 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
482 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
483 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
484 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
485 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
486 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
487 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
488 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
489 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
490 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
491 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
492 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
493 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
494 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
495 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
496 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
497 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
498 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
499 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
503 crc32c(const guint8* buf, unsigned int len, guint32 crc32_init)
509 for (i = 0; i < len; i++)
510 CRC32C(crc32, buf[i]);
516 finalize_crc32c(guint32 crc32)
519 guint8 byte0,byte1,byte2,byte3;
522 byte0 = result & 0xff;
523 byte1 = (result>>8) & 0xff;
524 byte2 = (result>>16) & 0xff;
525 byte3 = (result>>24) & 0xff;
526 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
531 number_of_padding_bytes (unsigned long length)
533 unsigned long remainder;
535 remainder = length % 4;
540 return 4 - remainder;
543 /*----------------------------------------------------------------------
544 * Write current packet out
547 write_current_packet (void)
550 int proto_length = 0;
552 int eth_trailer_length = 0;
553 int i, padding_length;
555 struct pcaprec_hdr ph;
557 if (curr_offset > 0) {
558 /* Write the packet */
560 /* Compute packet length */
561 length = curr_offset;
562 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
563 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
564 if (hdr_udp) { length += sizeof(HDR_UDP); proto_length = length; }
565 if (hdr_tcp) { length += sizeof(HDR_TCP); proto_length = length; }
566 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
568 length += sizeof(HDR_ETHERNET);
571 eth_trailer_length = 60 - length;
576 /* Write PCAP header */
577 ph.ts_sec = (guint32)ts_sec;
578 ph.ts_usec = ts_usec;
579 if (ts_fmt == NULL) { ts_usec++; } /* fake packet counter */
580 ph.incl_len = length;
581 ph.orig_len = length;
582 fwrite(&ph, sizeof(ph), 1, output_file);
584 /* Write Ethernet header */
586 HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
587 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
590 /* Write IP header */
592 HDR_IP.packet_length = g_htons(ip_length);
593 HDR_IP.protocol = (guint8) hdr_ip_proto;
594 HDR_IP.hdr_checksum = 0;
595 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
596 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
599 /* initialize pseudo header for checksum calculation */
600 pseudoh.src_addr = HDR_IP.src_addr;
601 pseudoh.dest_addr = HDR_IP.dest_addr;
603 pseudoh.protocol = (guint8) hdr_ip_proto;
604 pseudoh.length = g_htons(proto_length);
606 /* Write UDP header */
609 HDR_UDP.source_port = g_htons(hdr_src_port);
610 HDR_UDP.dest_port = g_htons(hdr_dest_port);
611 HDR_UDP.length = g_htons(proto_length);
613 /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
614 HDR_UDP.checksum = 0;
615 x16 = in_checksum(&pseudoh, sizeof(pseudoh));
617 x16 = in_checksum(&HDR_UDP, sizeof(HDR_UDP));
619 x16 = in_checksum(packet_buf, curr_offset);
621 x16 = (u & 0xffff) + (u>>16);
622 HDR_UDP.checksum = g_htons(x16);
623 if (HDR_UDP.checksum == 0) /* differentiate between 'none' and 0 */
624 HDR_UDP.checksum = g_htons(1);
626 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
629 /* Write TCP header */
632 HDR_TCP.source_port = g_htons(hdr_src_port);
633 HDR_TCP.dest_port = g_htons(hdr_dest_port);
634 /* HDR_TCP.seq_num already correct */
635 HDR_TCP.window = g_htons(0x2000);
637 /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
638 HDR_TCP.checksum = 0;
639 x16 = in_checksum(&pseudoh, sizeof(pseudoh));
641 x16 = in_checksum(&HDR_TCP, sizeof(HDR_TCP));
643 x16 = in_checksum(packet_buf, curr_offset);
645 x16 = (u & 0xffff) + (u>>16);
646 HDR_TCP.checksum = g_htons(x16);
647 if (HDR_TCP.checksum == 0) /* differentiate between 'none' and 0 */
648 HDR_TCP.checksum = g_htons(1);
650 fwrite(&HDR_TCP, sizeof(HDR_TCP), 1, output_file);
653 /* Compute DATA chunk header and append padding */
654 if (hdr_data_chunk) {
655 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
656 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
657 HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
658 HDR_DATA_CHUNK.tsn = g_htonl(hdr_data_chunk_tsn);
659 HDR_DATA_CHUNK.sid = g_htons(hdr_data_chunk_sid);
660 HDR_DATA_CHUNK.ssn = g_htons(hdr_data_chunk_ssn);
661 HDR_DATA_CHUNK.ppid = g_htonl(hdr_data_chunk_ppid);
663 padding_length = number_of_padding_bytes(curr_offset);
664 for (i=0; i<padding_length; i++)
668 /* Write SCTP header */
671 HDR_SCTP.src_port = g_htons(hdr_sctp_src);
672 HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
673 HDR_SCTP.tag = g_htonl(hdr_sctp_tag);
674 HDR_SCTP.checksum = g_htonl(0);
675 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
677 HDR_SCTP.checksum = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
678 /* Note: g_ntohl() macro arg may be eval'd twice so calc value before invoking macro */
679 x32 = finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum));
680 HDR_SCTP.checksum = g_htonl(x32);
682 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
685 /* Write DATA chunk header */
686 if (hdr_data_chunk) {
687 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
690 fwrite(packet_buf, curr_offset, 1, output_file);
692 /* Write Ethernet trailer */
693 if (hdr_ethernet && eth_trailer_length > 0) {
694 memset(tempbuf, 0, eth_trailer_length);
695 fwrite(tempbuf, eth_trailer_length, 1, output_file);
699 fprintf(stderr, "Wrote packet of %lu bytes at %u\n", curr_offset, g_ntohl(HDR_TCP.seq_num));
700 num_packets_written ++;
702 HDR_TCP.seq_num = g_ntohl(HDR_TCP.seq_num) + curr_offset;
703 HDR_TCP.seq_num = g_htonl(HDR_TCP.seq_num);
705 packet_start += curr_offset;
709 /*----------------------------------------------------------------------
710 * Write the PCap file header
713 write_file_header (void)
717 fh.magic = PCAP_MAGIC;
718 fh.version_major = 2;
719 fh.version_minor = 4;
723 fh.network = pcap_link_type;
725 fwrite(&fh, sizeof(fh), 1, output_file);
728 /*----------------------------------------------------------------------
729 * Append a token to the packet preamble.
732 append_to_preamble(char *str)
736 if (packet_preamble_len != 0) {
737 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
738 return; /* no room to add more preamble */
739 /* Add a blank separator between the previous token and this token. */
740 packet_preamble[packet_preamble_len++] = ' ';
742 toklen = strlen(str);
744 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
745 return; /* no room to add the token to the preamble */
746 g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
747 packet_preamble_len += (int) toklen;
750 char xs[PACKET_PREAMBLE_MAX_LEN];
751 g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
752 while ((c = strchr(xs, '\r')) != NULL) *c=' ';
753 fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
758 /*----------------------------------------------------------------------
759 * Parse the preamble to get the timecode.
763 parse_preamble (void)
772 * If no "-t" flag was specified, don't attempt to parse a packet
773 * preamble to extract a time stamp.
779 * Initialize to today localtime, just in case not all fields
780 * of the date and time are specified.
783 timecode = timecode_default;
787 * Null-terminate the preamble.
789 packet_preamble[packet_preamble_len] = '\0';
791 /* Ensure preamble has more than two chars before attempting to parse.
792 * This should cover line breaks etc that get counted.
794 if ( strlen(packet_preamble) > 2 ) {
795 /* Get Time leaving subseconds */
796 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
797 if (subsecs != NULL) {
798 /* Get the long time from the tm structure */
799 /* (will return -1 if failure) */
800 ts_sec = mktime( &timecode );
802 ts_sec = -1; /* we failed to parse it */
804 /* This will ensure incorrectly parsed dates get set to zero */
807 /* Sanitize - remove all '\r' */
809 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
810 fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n (defaulting to Jan 1,1970 00:00:00 GMT)\n",
811 packet_preamble, ts_fmt);
813 fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
814 timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
815 timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
817 ts_sec = 0; /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
822 /* Parse subseconds */
823 ts_usec = strtol(subsecs, &p, 10);
829 * Convert that number to a number
830 * of microseconds; if it's N digits
831 * long, it's in units of 10^(-N) seconds,
832 * so, to convert it to units of
833 * 10^-6 seconds, we multiply by
836 subseclen = (int) (p - subsecs);
839 * *More* than 6 digits; 6-N is
840 * negative, so we divide by
843 for (i = subseclen - 6; i != 0; i--)
845 } else if (subseclen < 6) {
846 for (i = 6 - subseclen; i != 0; i--)
854 while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
855 fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
856 fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)ts_sec, ts_usec);
861 packet_preamble_len = 0;
864 /*----------------------------------------------------------------------
868 start_new_packet (void)
871 fprintf(stderr, "Start new packet\n");
873 /* Write out the current packet, if required */
874 write_current_packet();
877 /* Ensure we parse the packet preamble as it may contain the time */
881 /*----------------------------------------------------------------------
882 * Process a directive
885 process_directive (char *str)
887 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
891 /*----------------------------------------------------------------------
892 * Parse a single token (called from the scanner)
895 parse_token (token_t token, char *str)
900 * This is implemented as a simple state machine of five states.
901 * State transitions are caused by tokens being received from the
902 * scanner. The code should be self_documenting.
906 /* Sanitize - remove all '\r' */
908 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
910 fprintf(stderr, "(%s, %s \"%s\") -> (",
911 state_str[state], token_str[token], str ? str : "");
916 /* ----- Waiting for new packet -------------------------------------------*/
920 append_to_preamble(str);
923 process_directive(str);
926 num = parse_num(str, TRUE);
928 /* New packet starts here */
938 /* ----- Processing packet, start of new line -----------------------------*/
942 append_to_preamble(str);
945 process_directive(str);
948 num = parse_num(str, TRUE);
950 /* New packet starts here */
954 } else if ((num - packet_start) != curr_offset) {
956 * The offset we read isn't the one we expected.
957 * This may only mean that we mistakenly interpreted
958 * some text as byte values (e.g., if the text dump
959 * of packet data included a number with spaces around
960 * it). If the offset is less than what we expected,
961 * assume that's the problem, and throw away the putative
964 if (num < curr_offset) {
965 unwrite_bytes(curr_offset - num);
968 /* Bad offset; switch to INIT state */
970 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
972 write_current_packet();
983 /* ----- Processing packet, read offset -----------------------------------*/
987 /* Record the byte */
997 state = START_OF_LINE;
1004 /* ----- Processing packet, read byte -------------------------------------*/
1008 /* Record the byte */
1017 state = START_OF_LINE;
1024 /* ----- Processing packet, read text -------------------------------------*/
1028 state = START_OF_LINE;
1036 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
1041 fprintf(stderr, ", %s)\n", state_str[state]);
1045 /*----------------------------------------------------------------------
1046 * Print usage string and exit
1054 " (" SVNVERSION " from " SVNPATH ")"
1057 "Generate a capture file from an ASCII hexdump of packets.\n"
1058 "See http://www.wireshark.org for more information.\n"
1060 "Usage: text2pcap [options] <infile> <outfile>\n"
1062 "where <infile> specifies input filename (use - for standard input)\n"
1063 " <outfile> specifies output filename (use - for standard output)\n"
1066 " -o hex|oct|dec parse offsets as (h)ex, (o)ctal or (d)ecimal;\n"
1067 " default is hex.\n"
1068 " -t <timefmt> treat the text before the packet as a date/time code;\n"
1069 " the specified argument is a format string of the sort\n"
1070 " supported by strptime.\n"
1071 " Example: The time \"10:15:14.5476\" has the format code\n"
1072 " \"%%H:%%M:%%S.\"\n"
1073 " NOTE: The subsecond component delimiter, '.', must be\n"
1074 " given, but no pattern is required; the remaining\n"
1075 " number is assumed to be fractions of a second.\n"
1076 " NOTE: Date/time fields from the current date/time are\n"
1077 " used as the default for unspecified fields.\n"
1080 " -l <typenum> link-layer type number; default is 1 (Ethernet).\n"
1081 " See the file net/bpf.h for list of numbers.\n"
1082 " Use this option if your dump is a complete hex dump\n"
1083 " of an encapsulated packet and you wish to specify\n"
1084 " the exact type of encapsulation.\n"
1085 " Example: -l 7 for ARCNet packets.\n"
1086 " -m <max-packet> max packet length in output; default is %d\n"
1088 "Prepend dummy header:\n"
1089 " -e <l3pid> prepend dummy Ethernet II header with specified L3PID\n"
1091 " Example: -e 0x806 to specify an ARP packet.\n"
1092 " -i <proto> prepend dummy IP header with specified IP protocol\n"
1094 " Automatically prepends Ethernet header as well.\n"
1096 " -u <srcp>,<destp> prepend dummy UDP header with specified\n"
1097 " dest and source ports (in DECIMAL).\n"
1098 " Automatically prepends Ethernet & IP headers as well.\n"
1099 " Example: -u 1000,69 to make the packets look like\n"
1100 " TFTP/UDP packets.\n"
1101 " -T <srcp>,<destp> prepend dummy TCP header with specified\n"
1102 " dest and source ports (in DECIMAL).\n"
1103 " Automatically prepends Ethernet & IP headers as well.\n"
1104 " Example: -T 50,60\n"
1105 " -s <srcp>,<dstp>,<tag> prepend dummy SCTP header with specified\n"
1106 " dest/source ports and verification tag (in DECIMAL).\n"
1107 " Automatically prepends Ethernet & IP headers as well.\n"
1108 " Example: -s 30,40,34\n"
1109 " -S <srcp>,<dstp>,<ppi> prepend dummy SCTP header with specified\n"
1110 " dest/source ports and verification tag 0.\n"
1111 " Automatically prepends a dummy SCTP DATA\n"
1112 " chunk header with payload protocol identifier ppi.\n"
1113 " Example: -S 30,40,34\n"
1116 " -h display this help and exit.\n"
1117 " -d show detailed debug of parser states.\n"
1118 " -q generate no output at all (automatically turns off -d).\n"
1120 VERSION, MAX_PACKET);
1125 /*----------------------------------------------------------------------
1129 parse_options (int argc, char *argv[])
1135 arg_list_utf_16to8(argc, argv);
1138 /* Scan CLI parameters */
1139 while ((c = getopt(argc, argv, "dhqe:i:l:m:o:u:s:S:t:T:")) != -1) {
1141 case '?': usage(); break;
1142 case 'h': usage(); break;
1143 case 'd': if (!quiet) debug++; break;
1144 case 'q': quiet = TRUE; debug = FALSE; break;
1145 case 'l': pcap_link_type = strtol(optarg, NULL, 0); break;
1146 case 'm': max_offset = strtol(optarg, NULL, 0); break;
1148 if (optarg[0]!='h' && optarg[0] != 'o' && optarg[0] != 'd') {
1149 fprintf(stderr, "Bad argument for '-o': %s\n", optarg);
1153 case 'o': offset_base = 8; break;
1154 case 'h': offset_base = 16; break;
1155 case 'd': offset_base = 10; break;
1159 hdr_ethernet = TRUE;
1160 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
1161 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1168 hdr_ip_proto = strtol(optarg, &p, 10);
1169 if (p == optarg || *p != '\0' || hdr_ip_proto < 0 ||
1170 hdr_ip_proto > 255) {
1171 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1174 hdr_ethernet = TRUE;
1175 hdr_ethernet_proto = 0x800;
1180 hdr_sctp_src = strtol(optarg, &p, 10);
1181 if (p == optarg || (*p != ',' && *p != '\0')) {
1182 fprintf(stderr, "Bad src port for '-%c'\n", c);
1186 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1191 hdr_sctp_dest = strtol(optarg, &p, 10);
1192 if (p == optarg || (*p != ',' && *p != '\0')) {
1193 fprintf(stderr, "Bad dest port for '-s'\n");
1197 fprintf(stderr, "No tag specified for '-%c'\n", c);
1202 hdr_sctp_tag = strtol(optarg, &p, 10);
1203 if (p == optarg || *p != '\0') {
1204 fprintf(stderr, "Bad tag for '-%c'\n", c);
1210 hdr_ethernet = TRUE;
1211 hdr_ethernet_proto = 0x800;
1215 hdr_data_chunk = TRUE;
1216 hdr_sctp_src = strtol(optarg, &p, 10);
1217 if (p == optarg || (*p != ',' && *p != '\0')) {
1218 fprintf(stderr, "Bad src port for '-%c'\n", c);
1222 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1227 hdr_sctp_dest = strtol(optarg, &p, 10);
1228 if (p == optarg || (*p != ',' && *p != '\0')) {
1229 fprintf(stderr, "Bad dest port for '-s'\n");
1233 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1238 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1239 if (p == optarg || *p != '\0') {
1240 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1246 hdr_ethernet = TRUE;
1247 hdr_ethernet_proto = 0x800;
1257 hdr_src_port = strtol(optarg, &p, 10);
1258 if (p == optarg || (*p != ',' && *p != '\0')) {
1259 fprintf(stderr, "Bad src port for '-u'\n");
1263 fprintf(stderr, "No dest port specified for '-u'\n");
1268 hdr_dest_port = strtol(optarg, &p, 10);
1269 if (p == optarg || *p != '\0') {
1270 fprintf(stderr, "Bad dest port for '-u'\n");
1275 hdr_ethernet = TRUE;
1276 hdr_ethernet_proto = 0x800;
1282 hdr_src_port = strtol(optarg, &p, 10);
1283 if (p == optarg || (*p != ',' && *p != '\0')) {
1284 fprintf(stderr, "Bad src port for '-T'\n");
1288 fprintf(stderr, "No dest port specified for '-u'\n");
1293 hdr_dest_port = strtol(optarg, &p, 10);
1294 if (p == optarg || *p != '\0') {
1295 fprintf(stderr, "Bad dest port for '-T'\n");
1300 hdr_ethernet = TRUE;
1301 hdr_ethernet_proto = 0x800;
1309 if (optind >= argc || argc-optind < 2) {
1310 fprintf(stderr, "Must specify input and output filename\n");
1314 if (strcmp(argv[optind], "-")) {
1315 input_filename = g_strdup(argv[optind]);
1316 input_file = ws_fopen(input_filename, "rb");
1318 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1319 input_filename, g_strerror(errno));
1323 input_filename = "Standard input";
1327 if (strcmp(argv[optind+1], "-")) {
1328 output_filename = g_strdup(argv[optind+1]);
1329 output_file = ws_fopen(output_filename, "wb");
1331 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1332 output_filename, g_strerror(errno));
1336 output_filename = "Standard output";
1337 output_file = stdout;
1340 /* Some validation */
1341 if (pcap_link_type != 1 && hdr_ethernet) {
1342 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S -T) cannot be specified with link type override (-l)\n");
1346 /* Set up our variables */
1349 input_filename = "Standard input";
1352 output_file = stdout;
1353 output_filename = "Standard output";
1356 ts_sec = time(0); /* initialize to current time */
1357 timecode_default = *localtime(&ts_sec);
1358 timecode_default.tm_isdst = -1; /* Unknown for now, depends on time given to the strptime() function */
1360 /* Display summary of our state */
1362 fprintf(stderr, "Input from: %s\n", input_filename);
1363 fprintf(stderr, "Output to: %s\n", output_filename);
1365 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1366 hdr_ethernet_proto);
1367 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1369 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1370 hdr_src_port, hdr_dest_port);
1371 if (hdr_tcp) fprintf(stderr, "Generate dummy TCP header: Source port: %ld. Dest port: %ld\n",
1372 hdr_src_port, hdr_dest_port);
1373 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1374 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1375 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1376 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1381 main(int argc, char *argv[])
1383 parse_options(argc, argv);
1385 assert(input_file != NULL);
1386 assert(output_file != NULL);
1388 write_file_header();
1393 write_current_packet();
1395 fprintf(stderr, "\n-------------------------\n");
1397 fprintf(stderr, "Read %ld potential packet%s, wrote %ld packet%s\n",
1398 num_packets_read, (num_packets_read==1) ?"":"s",
1399 num_packets_written, (num_packets_written==1)?"":"s");