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/*
* QPACK stream decoder. Decode a series of hex codes on stdin using one line
* per H3 HEADERS frame. Silently skip spaces, tabs, CR, '-' and ','.
*
* Compilation via Makefile
*
* Example run:
* echo 0000d1d7508b089d5c0b8170dc101a699fc15f5085ed6989397f | ./dev/qpack/decode
*/
#include <ctype.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#define MAX_RQ_SIZE 65536
#define MAX_HDR_NUM 1000
#define QPACK_STANDALONE
#define USE_OPENSSL
#define USE_QUIC
#include <haproxy/buf-t.h>
#include <haproxy/http-hdr-t.h>
#include <haproxy/qpack-dec.h>
#include <haproxy/qpack-tbl.h>
char line[MAX_RQ_SIZE * 3 + 3];
uint8_t bin[MAX_RQ_SIZE];
char tmp_buf[MAX_RQ_SIZE];
struct buffer buf = { .area = tmp_buf, .data = 0, .size = sizeof(tmp_buf) };
#define DEBUG_QPACK
#include "../src/hpack-huff.c"
#include "../src/qpack-dec.c"
#include "../src/qpack-tbl.c"
/* define to compile with BUG_ON/ABORT_NOW statements */
void ha_backtrace_to_stderr(void)
{
}
/* taken from dev/hpack/decode.c */
int hex2bin(const char *hex, uint8_t *bin, int size)
{
int a, b, c;
uint8_t code;
int len = 0;
a = b = -1;
for (; *hex; hex++) {
c = *hex;
if (c == ' ' || c == '\t' || c == '\r' ||
c == '-' || c == ',')
continue;
if (c == '\n' || c == '#')
break;
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'a' && c <= 'f')
c -= 'a' - 10;
else if (c >= 'A' && c <= 'F')
c -= 'A' - 10;
else
return -1;
if (a == -1)
a = c;
else
b = c;
if (b == -1)
continue;
code = (a << 4) | b;
a = b = -1;
if (len >= size)
return -2;
bin[len] = code;
len++;
}
if (a >= 0 || b >= 0)
return -3;
return len;
}
/* taken from src/tools.c */
void debug_hexdump(FILE *out, const char *pfx, const char *buf,
unsigned int baseaddr, int len)
{
unsigned int i;
int b, j;
for (i = 0; i < (len + (baseaddr & 15)); i += 16) {
b = i - (baseaddr & 15);
fprintf(out, "%s%08x: ", pfx ? pfx : "", i + (baseaddr & ~15));
for (j = 0; j < 8; j++) {
if (b + j >= 0 && b + j < len)
fprintf(out, "%02x ", (unsigned char)buf[b + j]);
else
fprintf(out, " ");
}
if (b + j >= 0 && b + j < len)
fputc('-', out);
else
fputc(' ', out);
for (j = 8; j < 16; j++) {
if (b + j >= 0 && b + j < len)
fprintf(out, " %02x", (unsigned char)buf[b + j]);
else
fprintf(out, " ");
}
fprintf(out, " ");
for (j = 0; j < 16; j++) {
if (b + j >= 0 && b + j < len) {
if (isprint((unsigned char)buf[b + j]))
fputc((unsigned char)buf[b + j], out);
else
fputc('.', out);
}
else
fputc(' ', out);
}
fputc('\n', out);
}
}
int main(int argc, char **argv)
{
struct http_hdr hdrs[MAX_HDR_NUM];
int len, outlen, hdr_idx;
do {
if (!fgets(line, sizeof(line), stdin))
break;
if ((len = hex2bin(line, bin, MAX_RQ_SIZE)) < 0)
break;
outlen = qpack_decode_fs(bin, len, &buf, hdrs,
sizeof(hdrs) / sizeof(hdrs[0]));
if (outlen < 0) {
fprintf(stderr, "QPACK decoding failed: %d\n", outlen);
continue;
}
hdr_idx = 0;
fprintf(stderr, "<<< Found %d headers:\n", outlen);
while (1) {
if (isteq(hdrs[hdr_idx].n, ist("")))
break;
fprintf(stderr, "%.*s: %.*s\n",
(int)hdrs[hdr_idx].n.len, hdrs[hdr_idx].n.ptr,
(int)hdrs[hdr_idx].v.len, hdrs[hdr_idx].v.ptr);
++hdr_idx;
}
} while (1);
return EXIT_SUCCESS;
}
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