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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <skalibs/bytestr.h>
#include <skalibs/buffer.h>
#include <skalibs/error.h>
#include <skalibs/avltreen.h>
#include <skalibs/unix-timed.h>
#include <tipidee/headers.h>
/*
Reads header lines, separates into \0-terminated keys+values.
key is at hdr->buf + hdr->list[i].left
value is at hdr->buf + hdr->list[i].right
Compresses linear whitespace.
Does not unquote strings/comments in values.
st\ev 0 1 2 3 4 5 6 7
CTL CR LF LWS : special normal 8bit
00 kp
START X END? END X X X K X
01
END? X X END X X X X X
02 zv p
K X X X X V1 X K X
03 p p p p
V1 X V1?? V1? V1 V V V V
04
V1?? X X V1? X X X X X
05 zn zn znkp
V1? X END? END V1 X X K X
06 s s s p p p p
V X V2?? V2? V2 V V V V
07 p p p p
V2 X V2?? V2? V2 V V V V
08
V2?? X X V2? X X X X X
09 mzn mzn mznkp
V2? X END? END V2 X X K X
END = 0a, X = 0b
0x4000 s: write space
0x2000 m: go back one char
0x1000 z: write \0
0x0800 n: cut key/value pair, prepare next
0x0400 k: start of key
0x0200 v: start of value
0x0100 p: write current char
states: 4 bits, actions: 7 bits
*/
struct tainp_s
{
tain const *deadline ;
tain *stamp ;
} ;
typedef int get1_func (buffer *, char *, struct tainp_s *) ;
typedef get1_func *get1_func_ref ;
static int get1_timed (buffer *b, char *c, struct tainp_s *d)
{
return buffer_timed_get(b, c, 1, d->deadline, d->stamp) ;
}
static int get1_notimed (buffer *b, char *c, struct tainp_s *data)
{
(void)data ;
return buffer_get(b, c, 1) == 1 ;
}
static uint8_t cclass (char c)
{
static uint8_t const ctable[128] = "00000000032001000000000000000000365666665566566566666666664565655666666666666666666666666665556666666666666666666666666666656560" ;
return c & 0x80 ? 7 : ctable[(uint8_t)c] - '0' ;
}
static int needs_processing (char const *s)
{
if (!strcasecmp(s, "Set-Cookie")) return 0 ;
if (str_start(s, "X-")) return 0 ;
return 1 ;
}
static int tipidee_headers_parse_with (buffer *b, tipidee_headers *hdr, get1_func_ref next, struct tainp_s *data, disize *header, uint32_t *state)
{
static uint16_t const table[10][8] =
{
{ 0x000b, 0x0001, 0x000a, 0x000b, 0x000b, 0x000b, 0x0502, 0x000b },
{ 0x000b, 0x000b, 0x000a, 0x000b, 0x000b, 0x000b, 0x000b, 0x000b },
{ 0x000b, 0x000b, 0x000b, 0x000b, 0x1203, 0x000b, 0x0102, 0x000b },
{ 0x000b, 0x0004, 0x0005, 0x0003, 0x0106, 0x0106, 0x0106, 0x0106 },
{ 0x000b, 0x000b, 0x0005, 0x000b, 0x000b, 0x000b, 0x000b, 0x000b },
{ 0x000b, 0x1801, 0x180a, 0x0003, 0x000b, 0x000b, 0x1d02, 0x000b },
{ 0x000b, 0x4008, 0x4009, 0x4007, 0x0106, 0x0106, 0x0106, 0x0106 },
{ 0x000b, 0x0008, 0x0009, 0x0007, 0x0106, 0x0106, 0x0106, 0x0106 },
{ 0x000b, 0x000b, 0x0009, 0x000b, 0x000b, 0x000b, 0x000b, 0x000b },
{ 0x000b, 0x3801, 0x380a, 0x0007, 0x000b, 0x000b, 0x3d02, 0x000b },
} ;
while (*state < 0x0a)
{
uint16_t c ;
char cur ;
if (!(*next)(b, &cur, data))
return errno == ETIMEDOUT ? 408 : error_isagain(errno) ? -2 : -1 ;
c = table[*state][cclass(cur)] ;
/*
{
char s[2] = { cur, 0 } ;
LOLDEBUG("tipidee_headers_parse_with: state %hhu, event %s, newstate %hhu, actions %s%s%s%s%s%s%s",
*state,
cur == '\r' ? "\\r" : cur == '\n' ? "\\n" : s,
c & 0x0f,
c & 0x4000 ? "s" : "",
c & 0x2000 ? "m" : "",
c & 0x1000 ? "z" : "",
c & 0x0800 ? "n" : "",
c & 0x0400 ? "k" : "",
c & 0x0200 ? "v" : "",
c & 0x0100 ? "p" : ""
) ;
}
*/
*state = c & 0x0f ;
if (c & 0x4000) { if (hdr->len >= hdr->max) return 413 ; hdr->buf[hdr->len++] = ' ' ; }
if (c & 0x2000) hdr->len-- ;
if (c & 0x1000) { if (hdr->len >= hdr->max) return 413 ; hdr->buf[hdr->len++] = 0 ; }
if (c & 0x0800)
{
uint32_t prev ;
if (hdr->n >= TIPIDEE_HEADERS_MAX) return 413 ;
hdr->list[hdr->n] = *header ;
if (needs_processing(hdr->buf + header->left))
{
// LOLDEBUG("tipidee_headers_parse_with: n: adding header %u - key %zu (%s), value %zu (%s)", hdr->n, header->left, hdr->buf + header->left, header->right, hdr->buf + header->right) ;
if (avltreen_search(&hdr->map, hdr->buf + header->left, &prev))
{
size_t start = hdr->list[prev+1].left ;
// LOLDEBUG(" found at %u (next start is %zu), needs to collate", prev, start) ;
if (prev+1 == hdr->n)
{
// LOLDEBUG(" consecutive headers -> concatenating") ;
hdr->buf[start - 1] = ',' ;
hdr->buf[start] = ' ' ;
memmove(hdr->buf + start + 1, hdr->buf + header->right, hdr->len - header->right) ;
}
else
{
size_t len = header->left - start ;
size_t offset = hdr->len - header->right + 1 ;
char tmp[len] ;
// LOLDEBUG(" not consecutive: len is %zu, offset is %zu", len, offset) ;
memcpy(tmp, hdr->buf + start, len) ;
hdr->buf[start - 1] = ',' ;
hdr->buf[start] = ' ' ;
memmove(hdr->buf + start + 1, hdr->buf + header->right, hdr->len - header->right) ;
memcpy(hdr->buf + start + offset, tmp, len) ;
for (uint32_t i = prev + 1 ; i < hdr->n ; i++)
{
hdr->list[i].left += offset ;
hdr->list[i].right += offset ;
}
}
hdr->len -= header->right - header->left - 1 ;
hdr->n-- ;
}
else if (!avltreen_insert(&hdr->map, hdr->n)) return 500 ;
}
hdr->n++ ;
}
if (c & 0x0400) header->left = hdr->len ;
if (c & 0x0200) header->right = hdr->len ;
if (c & 0x0100) { if (hdr->len >= hdr->max) return 413 ; hdr->buf[hdr->len++] = cur ; }
}
if (*state > 0x0a) return 400 ;
return 0 ;
}
int tipidee_headers_timed_parse (buffer *b, tipidee_headers *hdr, tain const *deadline, tain *stamp)
{
struct tainp_s d = { .deadline = deadline, .stamp = stamp } ;
disize header = DISIZE_ZERO ;
uint32_t state = 0 ;
return tipidee_headers_parse_with(b, hdr, &get1_timed, &d, &header, &state) ;
}
int tipidee_headers_parse_nb (buffer *b, tipidee_headers *hdr, disize *header, uint32_t *state)
{
return tipidee_headers_parse_with(b, hdr, &get1_notimed, 0, header, state) ;
}
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