freebsd-dev/contrib/ldns/drill/work.c
Dag-Erling Smørgrav 986ba33c7a Upgrade LDNS to 1.7.0.
I've been holding back on this because 1.7.0 requires OpenSSL 1.1.0 or
newer for full DANE support.  But we can't wait forever, and nothing in
base uses DANE anyway, so here we go.
2018-05-12 12:00:18 +00:00

262 lines
5.0 KiB
C

/*
* 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
*/
static 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;
}
static 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);
}