1 /**-*-C-*-**********************************************************************
5 * Utility to convert an ASCII hexdump into a libpcap-format capture file
7 * (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
9 * $Id: text2pcap.c,v 1.22 2002/08/28 21:00:41 jmayer Exp $
11 * Ethereal - Network traffic analyzer
12 * By Gerald Combs <gerald@ethereal.com>
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 headers to the packets in order to allow
69 * 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.
90 * Just make sure we include the prototype for strptime as well
91 * (needed for glibc 2.2)
109 #ifdef NEED_STRPTIME_H
110 # include "strptime.h"
113 #include "text2pcap.h"
115 /*--- Options --------------------------------------------------------------------*/
118 static int debug = 0;
120 static int quiet = FALSE;
122 /* Dummy Ethernet header */
123 static int hdr_ethernet = FALSE;
124 static unsigned long hdr_ethernet_proto = 0;
126 /* Dummy IP header */
127 static int hdr_ip = FALSE;
128 static unsigned long hdr_ip_proto = 0;
130 /* Dummy UDP header */
131 static int hdr_udp = FALSE;
132 static unsigned long hdr_udp_dest = 0;
133 static unsigned long hdr_udp_src = 0;
135 /* Dummy SCTP header */
136 static int hdr_sctp = FALSE;
137 static unsigned long hdr_sctp_src = 0;
138 static unsigned long hdr_sctp_dest = 0;
139 static unsigned long hdr_sctp_tag = 0;
141 /* Dummy DATA chunk header */
142 static int hdr_data_chunk = FALSE;
143 static unsigned char hdr_data_chunk_type = 0;
144 static unsigned char hdr_data_chunk_bits = 3;
145 static unsigned long hdr_data_chunk_tsn = 0;
146 static unsigned short hdr_data_chunk_sid = 0;
147 static unsigned short hdr_data_chunk_ssn = 0;
148 static unsigned long hdr_data_chunk_ppid = 0;
151 /*--- Local date -----------------------------------------------------------------*/
153 /* This is where we store the packet currently being built */
154 #define MAX_PACKET 64000
155 static unsigned char packet_buf[MAX_PACKET];
156 static unsigned long curr_offset = 0;
158 /* This buffer contains strings present before the packet offset 0 */
159 #define PACKET_PREAMBLE_MAX_LEN 2048
160 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
161 static int packet_preamble_len = 0;
163 /* Number of packets read and written */
164 static unsigned long num_packets_read = 0;
165 static unsigned long num_packets_written = 0;
167 /* Time code of packet, derived from packet_preamble */
168 static unsigned long ts_sec = 0;
169 static unsigned long ts_usec = 0;
170 static char *ts_fmt = NULL;
173 static char *input_filename;
174 static FILE *input_file = NULL;
176 static char *output_filename;
177 static FILE *output_file = NULL;
179 /* Offset base to parse */
180 static unsigned long offset_base = 16;
184 /* ----- State machine -----------------------------------------------------------*/
186 /* Current state of parser */
188 INIT, /* Waiting for start of new packet */
189 START_OF_LINE, /* Starting from beginning of line */
190 READ_OFFSET, /* Just read the offset */
191 READ_BYTE, /* Just read a byte */
192 READ_TEXT, /* Just read text - ignore until EOL */
194 static parser_state_t state = INIT;
196 static const char *state_str[] = {"Init",
203 static const char *token_str[] = {"",
211 /* ----- Skeleton Packet Headers --------------------------------------------------*/
214 unsigned char src_addr[6];
215 unsigned char dest_addr[6];
216 unsigned short l3pid;
219 static hdr_ethernet_t HDR_ETHERNET = {
220 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
221 {0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
225 unsigned char ver_hdrlen;
227 unsigned short packet_length;
228 unsigned short identification;
230 unsigned char fragment;
232 unsigned char protocol;
233 unsigned short hdr_checksum;
234 unsigned long src_addr;
235 unsigned long dest_addr;
238 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
241 unsigned short source_port;
242 unsigned short dest_port;
243 unsigned short length;
244 unsigned short checksum;
247 static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
250 unsigned short src_port;
251 unsigned short dest_port;
253 unsigned long checksum;
256 static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
261 unsigned short length;
268 static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
270 static char tempbuf[64];
272 /*----------------------------------------------------------------------
273 * Stuff for writing a PCap file
275 #define PCAP_MAGIC 0xa1b2c3d4
277 /* "libpcap" file header (minus magic number). */
279 unsigned long magic; /* magic */
280 unsigned short version_major; /* major version number */
281 unsigned short version_minor; /* minor version number */
282 unsigned long thiszone; /* GMT to local correction */
283 unsigned long sigfigs; /* accuracy of timestamps */
284 unsigned long snaplen; /* max length of captured packets, in octets */
285 unsigned long network; /* data link type */
288 /* "libpcap" record header. */
290 unsigned long ts_sec; /* timestamp seconds */
291 unsigned long ts_usec; /* timestamp microseconds */
292 unsigned long incl_len; /* number of octets of packet saved in file */
293 unsigned long orig_len; /* actual length of packet */
296 /* Link-layer type; see net/bpf.h for details */
297 static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
299 /*----------------------------------------------------------------------
300 * Parse a single hex number
301 * Will abort the program if it can't parse the number
302 * Pass in TRUE if this is an offset, FALSE if not
305 parse_num (char *str, int offset)
310 num = strtoul(str, &c, offset ? offset_base : 16);
312 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
318 /*----------------------------------------------------------------------
319 * Write this byte into current packet
322 write_byte (char *str)
326 num = parse_num(str, FALSE);
327 packet_buf[curr_offset] = num;
331 /*----------------------------------------------------------------------
332 * Remove bytes from the current packet
335 unwrite_bytes (unsigned long nbytes)
337 curr_offset -= nbytes;
340 /*----------------------------------------------------------------------
341 * Compute one's complement checksum (from RFC1071)
343 static unsigned short
344 in_checksum (void *buf, unsigned long count)
346 unsigned long sum = 0;
347 unsigned short *addr = buf;
350 /* This is the inner loop */
351 sum += g_ntohs(* (unsigned short *) addr++);
355 /* Add left-over byte, if any */
357 sum += * (unsigned char *) addr;
359 /* Fold 32-bit sum to 16 bits */
361 sum = (sum & 0xffff) + (sum >> 16);
363 return g_htons(~sum);
366 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
367 * That code is copyrighted by D. Otis and has been modified.
370 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
371 static unsigned long crc_c[256] =
373 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
374 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
375 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
376 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
377 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
378 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
379 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
380 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
381 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
382 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
383 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
384 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
385 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
386 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
387 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
388 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
389 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
390 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
391 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
392 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
393 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
394 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
395 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
396 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
397 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
398 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
399 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
400 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
401 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
402 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
403 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
404 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
405 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
406 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
407 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
408 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
409 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
410 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
411 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
412 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
413 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
414 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
415 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
416 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
417 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
418 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
419 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
420 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
421 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
422 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
423 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
424 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
425 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
426 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
427 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
428 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
429 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
430 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
431 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
432 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
433 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
434 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
435 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
436 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
440 crc32c(const unsigned char* buf, unsigned int len, unsigned long crc32_init)
446 for (i = 0; i < len; i++)
447 CRC32C(crc32, buf[i]);
453 finalize_crc32c(unsigned long crc32)
455 unsigned long result;
456 unsigned char byte0,byte1,byte2,byte3;
459 byte0 = result & 0xff;
460 byte1 = (result>>8) & 0xff;
461 byte2 = (result>>16) & 0xff;
462 byte3 = (result>>24) & 0xff;
463 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
468 number_of_padding_bytes (unsigned long length)
470 unsigned long remainder;
472 remainder = length % 4;
477 return 4 - remainder;
480 /*----------------------------------------------------------------------
481 * Write current packet out
484 write_current_packet (void)
489 int eth_trailer_length = 0;
490 int i, padding_length;
491 struct pcaprec_hdr ph;
493 if (curr_offset > 0) {
494 /* Write the packet */
496 /* Compute packet length */
497 length = curr_offset;
498 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
499 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
500 if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
501 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
503 length += sizeof(HDR_ETHERNET);
506 eth_trailer_length = 60 - length;
511 /* Write PCap header */
513 ph.ts_usec = ts_usec;
514 ph.incl_len = length;
515 ph.orig_len = length;
516 fwrite(&ph, sizeof(ph), 1, output_file);
518 /* Write Ethernet header */
520 HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
521 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
524 /* Write IP header */
526 HDR_IP.packet_length = g_htons(ip_length);
527 HDR_IP.protocol = hdr_ip_proto;
528 HDR_IP.hdr_checksum = 0;
529 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
530 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
533 /* Write UDP header */
535 HDR_UDP.source_port = g_htons(hdr_udp_src);
536 HDR_UDP.dest_port = g_htons(hdr_udp_dest);
537 HDR_UDP.length = g_htons(udp_length);
539 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
542 /* Compute DATA chunk header and append padding */
543 if (hdr_data_chunk) {
544 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
545 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
546 HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
547 HDR_DATA_CHUNK.tsn = g_htonl(hdr_data_chunk_tsn);
548 HDR_DATA_CHUNK.sid = g_htons(hdr_data_chunk_sid);
549 HDR_DATA_CHUNK.ssn = g_htons(hdr_data_chunk_ssn);
550 HDR_DATA_CHUNK.ppid = g_htonl(hdr_data_chunk_ppid);
552 padding_length = number_of_padding_bytes(curr_offset);
553 for (i=0; i<padding_length; i++)
557 /* Write SCTP header */
559 HDR_SCTP.src_port = g_htons(hdr_sctp_src);
560 HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
561 HDR_SCTP.tag = g_htonl(hdr_sctp_tag);
562 HDR_SCTP.checksum = g_htonl(0);
563 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
565 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
566 HDR_SCTP.checksum = g_htonl(finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum)));
568 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
571 /* Write DATA chunk header */
572 if (hdr_data_chunk) {
573 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
576 fwrite(packet_buf, curr_offset, 1, output_file);
578 /* Write Ethernet trailer */
579 if (hdr_ethernet && eth_trailer_length > 0) {
580 memset(tempbuf, 0, eth_trailer_length);
581 fwrite(tempbuf, eth_trailer_length, 1, output_file);
585 fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
586 num_packets_written ++;
591 /*----------------------------------------------------------------------
592 * Write the PCap file header
595 write_file_header (void)
599 fh.magic = PCAP_MAGIC;
600 fh.version_major = 2;
601 fh.version_minor = 4;
605 fh.network = pcap_link_type;
607 fwrite(&fh, sizeof(fh), 1, output_file);
610 /*----------------------------------------------------------------------
611 * Append a token to the packet preamble.
614 append_to_preamble(char *str)
618 if (packet_preamble_len != 0) {
619 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
620 return; /* no room to add more preamble */
621 /* Add a blank separator between the previous token and this token. */
622 packet_preamble[packet_preamble_len++] = ' ';
624 toklen = strlen(str);
626 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
627 return; /* no room to add the token to the preamble */
628 strcpy(&packet_preamble[packet_preamble_len], str);
629 packet_preamble_len += toklen;
633 /*----------------------------------------------------------------------
634 * Parse the preamble to get the timecode.
637 parse_preamble (void)
646 * If no "-t" flag was specified, don't attempt to parse a packet
647 * preamble to extract a time stamp.
656 * Null-terminate the preamble.
658 packet_preamble[packet_preamble_len] = '\0';
660 /* Ensure preamble has more than two chars before atempting to parse.
661 * This should cover line breaks etc that get counted.
663 if ( strlen(packet_preamble) > 2 ) {
665 * Initialize to the Epoch, just in case not all fields
666 * of the date and time are specified.
670 timecode.tm_hour = 0;
671 timecode.tm_mday = 1;
673 timecode.tm_year = 70;
674 timecode.tm_wday = 0;
675 timecode.tm_yday = 0;
676 timecode.tm_isdst = -1;
678 /* Get Time leaving subseconds */
679 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
680 if (subsecs != NULL) {
681 /* Get the long time from the tm structure */
682 ts_sec = (unsigned long)mktime( &timecode );
684 ts_sec = -1; /* we failed to parse it */
686 /* This will ensure incorrectly parsed dates get set to zero */
687 if ( -1L == (long)ts_sec )
694 /* Parse subseconds */
695 ts_usec = strtol(subsecs, &p, 10);
701 * Convert that number to a number
702 * of microseconds; if it's N digits
703 * long, it's in units of 10^(-N) seconds,
704 * so, to convert it to units of
705 * 10^-6 seconds, we multiply by
708 subseclen = p - subsecs;
711 * *More* than 6 digits; 6-N is
712 * negative, so we divide by
715 for (i = subseclen - 6; i != 0; i--)
717 } else if (subseclen < 6) {
718 for (i = 6 - subseclen; i != 0; i--)
726 /*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
729 packet_preamble_len = 0;
732 /*----------------------------------------------------------------------
736 start_new_packet (void)
739 fprintf(stderr, "Start new packet\n");
741 /* Write out the current packet, if required */
742 write_current_packet();
746 /* Ensure we parse the packet preamble as it may contain the time */
750 /*----------------------------------------------------------------------
751 * Process a directive
754 process_directive (char *str)
756 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
760 /*----------------------------------------------------------------------
761 * Parse a single token (called from the scanner)
764 parse_token (token_t token, char *str)
769 * This is implemented as a simple state machine of five states.
770 * State transitions are caused by tokens being received from the
771 * scanner. The code should be self_documenting.
775 /* Sanitize - remove all '\r' */
777 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
779 fprintf(stderr, "(%s, %s \"%s\") -> (",
780 state_str[state], token_str[token], str ? str : "");
785 /* ----- Waiting for new packet -------------------------------------------*/
789 append_to_preamble(str);
792 process_directive(str);
795 num = parse_num(str, TRUE);
797 /* New packet starts here */
807 /* ----- Processing packet, start of new line -----------------------------*/
811 append_to_preamble(str);
814 process_directive(str);
817 num = parse_num(str, TRUE);
819 /* New packet starts here */
822 } else if (num != curr_offset) {
824 * The offset we read isn't the one we expected.
825 * This may only mean that we mistakenly interpreted
826 * some text as byte values (e.g., if the text dump
827 * of packet data included a number with spaces around
828 * it). If the offset is less than what we expected,
829 * assume that's the problem, and throw away the putative
832 if (num < curr_offset) {
833 unwrite_bytes(curr_offset - num);
836 /* Bad offset; switch to INIT state */
838 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
840 write_current_packet();
851 /* ----- Processing packet, read offset -----------------------------------*/
855 /* Record the byte */
865 state = START_OF_LINE;
872 /* ----- Processing packet, read byte -------------------------------------*/
876 /* Record the byte */
885 state = START_OF_LINE;
892 /* ----- Processing packet, read text -------------------------------------*/
896 state = START_OF_LINE;
904 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
909 fprintf(stderr, ", %s)\n", state_str[state]);
913 /*----------------------------------------------------------------------
914 * Print helpstring and exit
917 help (char *progname)
921 "Usage: %s [-h] [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
922 " [-u srcp,destp] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt]\n"
923 " <input-filename> <output-filename>\n"
925 "where <input-filename> specifies input filename (use - for standard input)\n"
926 " <output-filename> specifies output filename (use - for standard output)\n"
928 "[options] are one or more of the following \n"
930 " -h : Display this help message \n"
931 " -d : Generate detailed debug of parser states \n"
932 " -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
933 " -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
934 " See net/bpf.h for list of numbers.\n"
935 " -q : Generate no output at all (automatically turns off -d)\n"
936 " -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in\n"
938 " Example: -e 0x800\n"
939 " -i proto : Prepend dummy IP header with specified IP protocol (in\n"
941 " Automatically prepends Ethernet header as well.\n"
943 " -u srcp,destp : Prepend dummy UDP header with specified dest and source ports\n"
945 " Automatically prepends Ethernet and IP headers as well\n"
946 " Example: -u 30,40\n"
947 " -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports\n"
948 " and verification tag (in DECIMAL).\n"
949 " Automatically prepends Ethernet and IP headers as well\n"
950 " Example: -s 30,40,34\n"
951 " -S srcp,dstp,ppi: Prepend dummy SCTP header with specified dest/source ports\n"
952 " and verification tag 0. It also prepends a dummy SCTP DATA\n"
953 " chunk header with payload protocol identifier ppi.\n"
954 " Example: -S 30,40,34\n"
955 " -t timefmt : Treats the text before the packet as a date/time code; the\n"
956 " specified argument is a format string of the sort supported\n"
958 " Example: The time \"10:15:14.5476\" has the format code\n"
959 " \"%%H:%%M:%%S.\"\n"
960 " NOTE: The subsecond component delimiter must be specified\n"
961 " (.) but no pattern is required; the remaining number\n"
962 " is assumed to be fractions of a second.\n"
969 /*----------------------------------------------------------------------
973 parse_options (int argc, char *argv[])
978 /* Scan CLI parameters */
979 while ((c = getopt(argc, argv, "dhqe:i:l:o:u:s:S:t:")) != -1) {
981 case '?': help(argv[0]); break;
982 case 'h': help(argv[0]); break;
983 case 'd': if (!quiet) debug++; break;
984 case 'q': quiet = TRUE; debug = FALSE; break;
985 case 'l': pcap_link_type = atoi(optarg); break;
987 if (optarg[0]!='h' && optarg[0] != 'o') {
988 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
991 offset_base = (optarg[0]=='o') ? 8 : 16;
995 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
996 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1003 if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
1004 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1007 hdr_ethernet = TRUE;
1008 hdr_ethernet_proto = 0x800;
1013 hdr_sctp_src = strtol(optarg, &p, 10);
1014 if (p == optarg || (*p != ',' && *p != '\0')) {
1015 fprintf(stderr, "Bad src port for '-%c'\n", c);
1019 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1024 hdr_sctp_dest = strtol(optarg, &p, 10);
1025 if (p == optarg || (*p != ',' && *p != '\0')) {
1026 fprintf(stderr, "Bad dest port for '-s'\n");
1030 fprintf(stderr, "No tag specified for '-%c'\n", c);
1035 hdr_sctp_tag = strtol(optarg, &p, 10);
1036 if (p == optarg || *p != '\0') {
1037 fprintf(stderr, "Bad tag for '-%c'\n", c);
1043 hdr_ethernet = TRUE;
1044 hdr_ethernet_proto = 0x800;
1048 hdr_data_chunk = TRUE;
1049 hdr_sctp_src = strtol(optarg, &p, 10);
1050 if (p == optarg || (*p != ',' && *p != '\0')) {
1051 fprintf(stderr, "Bad src port for '-%c'\n", c);
1055 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1060 hdr_sctp_dest = strtol(optarg, &p, 10);
1061 if (p == optarg || (*p != ',' && *p != '\0')) {
1062 fprintf(stderr, "Bad dest port for '-s'\n");
1065 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1070 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1071 if (p == optarg || *p != '\0') {
1072 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1078 hdr_ethernet = TRUE;
1079 hdr_ethernet_proto = 0x800;
1088 hdr_udp_src = strtol(optarg, &p, 10);
1089 if (p == optarg || (*p != ',' && *p != '\0')) {
1090 fprintf(stderr, "Bad src port for '-u'\n");
1094 fprintf(stderr, "No dest port specified for '-u'\n");
1099 hdr_udp_dest = strtol(optarg, &p, 10);
1100 if (p == optarg || *p != '\0') {
1101 fprintf(stderr, "Bad dest port for '-u'\n");
1106 hdr_ethernet = TRUE;
1107 hdr_ethernet_proto = 0x800;
1115 if (optind >= argc || argc-optind < 2) {
1116 fprintf(stderr, "Must specify input and output filename\n");
1120 if (strcmp(argv[optind], "-")) {
1121 input_filename = strdup(argv[optind]);
1122 input_file = fopen(input_filename, "rb");
1124 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1125 input_filename, strerror(errno));
1129 input_filename = "Standard input";
1133 if (strcmp(argv[optind+1], "-")) {
1134 output_filename = strdup(argv[optind+1]);
1135 output_file = fopen(output_filename, "wb");
1137 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1138 output_filename, strerror(errno));
1142 output_filename = "Standard output";
1143 output_file = stdout;
1146 /* Some validation */
1147 if (pcap_link_type != 1 && hdr_ethernet) {
1148 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S) cannot be specified with link type override (-l)\n");
1152 /* Set up our variables */
1155 input_filename = "Standard input";
1158 output_file = stdout;
1159 output_filename = "Standard output";
1162 /* Display summary of our state */
1164 fprintf(stderr, "Input from: %s\n", input_filename);
1165 fprintf(stderr, "Output to: %s\n", output_filename);
1167 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1168 hdr_ethernet_proto);
1169 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1171 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1172 hdr_udp_src, hdr_udp_dest);
1173 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1174 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1175 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1176 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1180 int main(int argc, char *argv[])
1182 parse_options(argc, argv);
1184 assert(input_file != NULL);
1185 assert(output_file != NULL);
1187 write_file_header();
1192 write_current_packet();
1194 fprintf(stderr, "\n-------------------------\n");
1196 fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
1197 num_packets_read, num_packets_written);