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/*
* work.c
* Where all the hard work is done
* (c) 2005 NLnet Labs
*
* See the file LICENSE for the license
*
*/
#include "drill.h"
#include <ldns/ldns.h>
/**
* Converts a hex string to binary data
* len is the length of the string
* buf is the buffer to store the result in
* offset is the starting position in the result buffer
*
* This function returns the length of the result
*/
size_t
hexstr2bin(char *hexstr, int len, uint8_t *buf, size_t offset, size_t buf_len)
{
char c;
int i;
uint8_t int8 = 0;
int sec = 0;
size_t bufpos = 0;
if (len % 2 != 0) {
return 0;
}
for (i=0; i<len; i++) {
c = hexstr[i];
/* case insensitive, skip spaces */
if (c != ' ') {
if (c >= '0' && c <= '9') {
int8 += c & 0x0f;
} else if (c >= 'a' && c <= 'z') {
int8 += (c & 0x0f) + 9;
} else if (c >= 'A' && c <= 'Z') {
int8 += (c & 0x0f) + 9;
} else {
return 0;
}
if (sec == 0) {
int8 = int8 << 4;
sec = 1;
} else {
if (bufpos + offset + 1 <= buf_len) {
buf[bufpos+offset] = int8;
int8 = 0;
sec = 0;
bufpos++;
} else {
error("Buffer too small in hexstr2bin");
}
}
}
}
return bufpos;
}
size_t
packetbuffromfile(char *filename, uint8_t *wire)
{
FILE *fp = NULL;
int c;
/* stat hack
* 0 = normal
* 1 = comment (skip to end of line)
* 2 = unprintable character found, read binary data directly
*/
int state = 0;
uint8_t *hexbuf = xmalloc(LDNS_MAX_PACKETLEN);
int hexbufpos = 0;
size_t wirelen;
if (strncmp(filename, "-", 2) == 0) {
fp = stdin;
} else {
fp = fopen(filename, "r");
}
if (fp == NULL) {
perror("Unable to open file for reading");
xfree(hexbuf);
return 0;
}
/*verbose("Opened %s\n", filename);*/
c = fgetc(fp);
while (c != EOF && hexbufpos < LDNS_MAX_PACKETLEN) {
if (state < 2 && !isascii(c)) {
/*verbose("non ascii character found in file: (%d) switching to raw mode\n", c);*/
state = 2;
}
switch (state) {
case 0:
if ( (c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F') )
{
hexbuf[hexbufpos] = (uint8_t) c;
hexbufpos++;
} else if (c == ';') {
state = 1;
} else if (c == ' ' || c == '\t' || c == '\n') {
/* skip whitespace */
}
break;
case 1:
if (c == '\n' || c == EOF) {
state = 0;
}
break;
case 2:
hexbuf[hexbufpos] = (uint8_t) c;
hexbufpos++;
break;
}
c = fgetc(fp);
}
if (c == EOF) {
/*
if (have_drill_opt && drill_opt->verbose) {
verbose("END OF FILE REACHED\n");
if (state < 2) {
verbose("read:\n");
verbose("%s\n", hexbuf);
} else {
verbose("Not printing wire because it contains non ascii data\n");
}
}
*/
}
if (hexbufpos >= LDNS_MAX_PACKETLEN) {
/*verbose("packet size reached\n");*/
}
/* lenient mode: length must be multiple of 2 */
if (hexbufpos % 2 != 0) {
hexbuf[hexbufpos] = (uint8_t) '0';
hexbufpos++;
}
if (state < 2) {
wirelen = hexstr2bin((char *) hexbuf,
hexbufpos,
wire,
0,
LDNS_MAX_PACKETLEN);
} else {
memcpy(wire, hexbuf, (size_t) hexbufpos);
wirelen = (size_t) hexbufpos;
}
if (fp != stdin) {
fclose(fp);
}
xfree(hexbuf);
return wirelen;
}
ldns_buffer *
read_hex_buffer(char *filename)
{
uint8_t *wire;
size_t wiresize;
ldns_buffer *result_buffer = NULL;
wire = xmalloc(LDNS_MAX_PACKETLEN);
wiresize = packetbuffromfile(filename, wire);
result_buffer = LDNS_MALLOC(ldns_buffer);
ldns_buffer_new_frm_data(result_buffer, wire, wiresize);
ldns_buffer_set_position(result_buffer, ldns_buffer_capacity(result_buffer));
xfree(wire);
return result_buffer;
}
ldns_pkt *
read_hex_pkt(char *filename)
{
uint8_t *wire;
size_t wiresize;
ldns_pkt *pkt = NULL;
ldns_status status = LDNS_STATUS_ERR;
wire = xmalloc(LDNS_MAX_PACKETLEN);
wiresize = packetbuffromfile(filename, wire);
if (wiresize > 0) {
status = ldns_wire2pkt(&pkt, wire, wiresize);
}
xfree(wire);
if (status == LDNS_STATUS_OK) {
return pkt;
} else {
fprintf(stderr, "Error parsing hex file: %s\n",
ldns_get_errorstr_by_id(status));
return NULL;
}
}
void
dump_hex(const ldns_pkt *pkt, const char *filename)
{
uint8_t *wire = NULL;
size_t size, i;
FILE *fp;
ldns_status status;
fp = fopen(filename, "w");
if (fp == NULL) {
error("Unable to open %s for writing", filename);
return;
}
status = ldns_pkt2wire(&wire, pkt, &size);
if (status != LDNS_STATUS_OK) {
error("Unable to convert packet: error code %u", status);
LDNS_FREE(wire);
fclose(fp);
return;
}
fprintf(fp, "; 0");
for (i = 1; i < 20; i++) {
fprintf(fp, " %2u", (unsigned int) i);
}
fprintf(fp, "\n");
fprintf(fp, ";--");
for (i = 1; i < 20; i++) {
fprintf(fp, " --");
}
fprintf(fp, "\n");
for (i = 0; i < size; i++) {
if (i % 20 == 0 && i > 0) {
fprintf(fp, "\t;\t%4u-%4u\n", (unsigned int) i-19, (unsigned int) i);
}
fprintf(fp, " %02x", (unsigned int)wire[i]);
}
fprintf(fp, "\n");
fclose(fp);
LDNS_FREE(wire);
}
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