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a1bd1faeeb
I found on an (old) AIX 5.1 machine that stdint.h didn't exist while inttypes.h which is expected to include it does exist and provides the desired functionalities. As explained here, stdint being just a subset of inttypes for use in freestanding environments, it's probably always OK to switch to inttypes instead: https://pubs.opengroup.org/onlinepubs/009696799/basedefs/stdint.h.html Also it's even clearer here in the autoconf doc : https://www.gnu.org/software/autoconf/manual/autoconf-2.61/html_node/Header-Portability.html "The C99 standard says that inttypes.h includes stdint.h, so there's no need to include stdint.h separately in a standard environment. Some implementations have inttypes.h but not stdint.h (e.g., Solaris 7), but we don't know of any implementation that has stdint.h but not inttypes.h"
211 lines
5.0 KiB
C
211 lines
5.0 KiB
C
/*
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* HPACK stream decoder. Takes a series of hex codes on stdin using one line
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* per HEADERS frame. Spaces, tabs, CR, '-' and ',' are silently skipped.
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* e.g. :
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* echo 82864188f439ce75c875fa5784 | contrib/hpack/decode
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*
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* The DHT size may optionally be changed in argv[1].
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*
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* Build like this :
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* gcc -I../../include -I../../ebtree -O0 -g -fno-strict-aliasing -fwrapv \
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* -o decode decode.c
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*/
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <common/chunk.h>
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#include <common/hpack-dec.h>
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#include <common/mini-clist.h>
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#define MAX_RQ_SIZE 65536
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#define MAX_HDR_NUM 1000
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char hex[MAX_RQ_SIZE*3+3]; // enough for "[ XX]* <CR> <LF> \0"
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uint8_t buf[MAX_RQ_SIZE];
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char trash_buf[MAX_RQ_SIZE];
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char tmp_buf[MAX_RQ_SIZE];
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struct buffer trash = { .area = trash_buf, .data = 0, .size = sizeof(trash_buf) };
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struct buffer tmp = { .area = tmp_buf, .data = 0, .size = sizeof(tmp_buf) };
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/* displays a <len> long memory block at <buf>, assuming first byte of <buf>
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* has address <baseaddr>. String <pfx> may be placed as a prefix in front of
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* each line. It may be NULL if unused. The output is emitted to file <out>.
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*/
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void debug_hexdump(FILE *out, const char *pfx, const char *buf,
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unsigned int baseaddr, int len)
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{
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unsigned int i;
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int b, j;
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for (i = 0; i < (len + (baseaddr & 15)); i += 16) {
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b = i - (baseaddr & 15);
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fprintf(out, "%s%08x: ", pfx ? pfx : "", i + (baseaddr & ~15));
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for (j = 0; j < 8; j++) {
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if (b + j >= 0 && b + j < len)
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fprintf(out, "%02x ", (unsigned char)buf[b + j]);
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else
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fprintf(out, " ");
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}
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if (b + j >= 0 && b + j < len)
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fputc('-', out);
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else
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fputc(' ', out);
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for (j = 8; j < 16; j++) {
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if (b + j >= 0 && b + j < len)
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fprintf(out, " %02x", (unsigned char)buf[b + j]);
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else
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fprintf(out, " ");
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}
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fprintf(out, " ");
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for (j = 0; j < 16; j++) {
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if (b + j >= 0 && b + j < len) {
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if (isprint((unsigned char)buf[b + j]))
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fputc((unsigned char)buf[b + j], out);
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else
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fputc('.', out);
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}
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else
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fputc(' ', out);
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}
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fputc('\n', out);
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}
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}
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/* enable DEBUG_HPACK to show each individual hpack code */
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#define DEBUG_HPACK
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#include "../src/hpack-huff.c"
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#include "../src/hpack-tbl.c"
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#include "../src/hpack-dec.c"
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/* display the message and exit with the code */
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__attribute__((noreturn)) void die(int code, const char *format, ...)
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{
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va_list args;
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if (format) {
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va_start(args, format);
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vfprintf(stderr, format, args);
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va_end(args);
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}
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exit(code);
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}
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/* reads <hex> and stops at the first LF, '#' or \0. Converts from hex to
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* binary, ignoring spaces, tabs, CR, "-" and ','. The output is sent into
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* <bin> for no more than <size> bytes. The number of bytes placed there is
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* returned, or a negative value in case of parsing error.
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*/
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int hex2bin(const char *hex, uint8_t *bin, int size)
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{
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int a, b, c;
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uint8_t code;
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int len = 0;
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a = b = -1;
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for (; *hex; hex++) {
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c = *hex;
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if (c == ' ' || c == '\t' || c == '\r' ||
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c == '-' || c == ',')
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continue;
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if (c == '\n' || c == '#')
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break;
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if (c >= '0' && c <= '9')
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c -= '0';
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else if (c >= 'a' && c <= 'f')
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c -= 'a' - 10;
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else if (c >= 'A' && c <= 'F')
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c -= 'A' - 10;
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else
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return -1;
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if (a == -1)
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a = c;
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else
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b = c;
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if (b == -1)
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continue;
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code = (a << 4) | b;
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a = b = -1;
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if (len >= size)
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return -2;
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bin[len] = code;
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len++;
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}
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if (a >= 0 || b >= 0)
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return -3;
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return len;
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}
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int main(int argc, char **argv)
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{
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struct hpack_dht *dht;
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struct http_hdr list[MAX_HDR_NUM];
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int outlen;
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int dht_size = 4096;
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int len, idx;
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int line;
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/* first arg: dht size */
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if (argc > 1) {
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dht_size = atoi(argv[1]);
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argv++; argc--;
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}
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dht = hpack_dht_alloc(dht_size);
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if (!dht) {
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die(1, "cannot initialize dht\n");
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return 1;
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}
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for (line = 1; fgets(hex, sizeof(hex), stdin); line++) {
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len = hex2bin(hex, buf, sizeof(buf));
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if (len <= 0)
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continue;
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printf("###### line %d : frame len=%d #######\n", line, len);
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debug_hexdump(stdout, " ", (const char *)buf, 0, len);
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outlen = hpack_decode_frame(dht, buf, len, list,
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sizeof(list)/sizeof(list[0]), &tmp);
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if (outlen <= 0) {
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printf(" HPACK decoding failed: %d\n", outlen);
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continue;
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}
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printf("<<< Found %d headers :\n", outlen);
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for (idx = 0; idx < outlen - 1; idx++) {
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//printf(" \e[1;34m%s\e[0m: ",
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// list[idx].n.ptr ? istpad(trash.str, list[idx].n).ptr : h2_phdr_to_str(list[idx].n.len));
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//printf("\e[1;35m%s\e[0m\n", istpad(trash.str, list[idx].v).ptr);
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printf(" %s: ", list[idx].n.ptr ?
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istpad(trash.area, list[idx].n).ptr :
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h2_phdr_to_str(list[idx].n.len));
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printf("%s [n=(%p,%d) v=(%p,%d)]\n",
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istpad(trash.area, list[idx].v).ptr,
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list[idx].n.ptr, (int)list[idx].n.len, list[idx].v.ptr, (int)list[idx].v.len);
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}
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puts(">>>");
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#ifdef DEBUG_HPACK
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printf("<<=== DHT dump [ptr=%p]:\n", dht);
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hpack_dht_dump(stdout, dht);
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puts("===>>");
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#endif
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}
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return 0;
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}
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