lsquic_version.c revision 4051ae3a
17d09751dSDmitri Tikhonov/* Copyright (c) 2017 - 2020 LiteSpeed Technologies Inc.  See LICENSE. */
250aadb33SDmitri Tikhonov#include <string.h>
350aadb33SDmitri Tikhonov
450aadb33SDmitri Tikhonov#include "lsquic.h"
550aadb33SDmitri Tikhonov#include "lsquic_int_types.h"
650aadb33SDmitri Tikhonov#include "lsquic_version.h"
750aadb33SDmitri Tikhonov
8fb3e20e0SDmitri Tikhonov#if _MSC_VER
9fb3e20e0SDmitri Tikhonov#include "vc_compat.h"
10fb3e20e0SDmitri Tikhonov#endif
11fb3e20e0SDmitri Tikhonov
1250aadb33SDmitri Tikhonov
1350aadb33SDmitri Tikhonovstatic const unsigned char version_tags[N_LSQVER][4] =
1450aadb33SDmitri Tikhonov{
15c95974e9SDmitri Tikhonov    [LSQVER_043] = { 'Q', '0', '4', '3', },
16c7d81ce1SDmitri Tikhonov    [LSQVER_046] = { 'Q', '0', '4', '6', },
177a8b2eceSDmitri Tikhonov    [LSQVER_050] = { 'Q', '0', '5', '0', },
189626cfc2SDmitri Tikhonov#if LSQUIC_USE_Q098
199626cfc2SDmitri Tikhonov    [LSQVER_098] = { 'Q', '0', '9', '8', },
209626cfc2SDmitri Tikhonov#endif
21bc520ef7SDmitri Tikhonov    [LSQVER_ID27] = { 0xFF, 0, 0, 27, },
22fb73393fSDmitri Tikhonov    [LSQVER_ID28] = { 0xFF, 0, 0, 28, },
234051ae3aSDmitri Tikhonov    [LSQVER_ID29] = { 0xFF, 0, 0, 29, },
245392f7a3SLiteSpeed Tech    [LSQVER_VERNEG] = { 0xFA, 0xFA, 0xFA, 0xFA, },
2550aadb33SDmitri Tikhonov};
2650aadb33SDmitri Tikhonov
2750aadb33SDmitri Tikhonov
2850aadb33SDmitri Tikhonovuint32_t
2950aadb33SDmitri Tikhonovlsquic_ver2tag (unsigned version)
3050aadb33SDmitri Tikhonov{
3150aadb33SDmitri Tikhonov    lsquic_ver_tag_t tag;
3250aadb33SDmitri Tikhonov    if (version < N_LSQVER)
3350aadb33SDmitri Tikhonov    {
3450aadb33SDmitri Tikhonov        memcpy(&tag, version_tags[version], 4);
3550aadb33SDmitri Tikhonov        return tag;
3650aadb33SDmitri Tikhonov    }
3750aadb33SDmitri Tikhonov    else
3850aadb33SDmitri Tikhonov        return 0;
3950aadb33SDmitri Tikhonov}
4050aadb33SDmitri Tikhonov
4150aadb33SDmitri Tikhonov
4250aadb33SDmitri Tikhonovenum lsquic_version
4350aadb33SDmitri Tikhonovlsquic_tag2ver (uint32_t ver_tag)
4450aadb33SDmitri Tikhonov{
4550aadb33SDmitri Tikhonov    unsigned n;
4650aadb33SDmitri Tikhonov    for (n = 0; n < sizeof(version_tags) / sizeof(version_tags[0]); ++n)
4750aadb33SDmitri Tikhonov        if (0 == memcmp(version_tags[n], &ver_tag, sizeof(ver_tag)))
4850aadb33SDmitri Tikhonov            return n;
4950aadb33SDmitri Tikhonov    return -1;
5050aadb33SDmitri Tikhonov}
5150aadb33SDmitri Tikhonov
5250aadb33SDmitri Tikhonov
535392f7a3SLiteSpeed Techconst char *const lsquic_ver2str[N_LSQVER] = {
545392f7a3SLiteSpeed Tech    [LSQVER_043] = "Q043",
555392f7a3SLiteSpeed Tech    [LSQVER_046] = "Q046",
567a8b2eceSDmitri Tikhonov    [LSQVER_050] = "Q050",
575392f7a3SLiteSpeed Tech#if LSQUIC_USE_Q098
585392f7a3SLiteSpeed Tech    [LSQVER_098] = "Q098",
595392f7a3SLiteSpeed Tech#endif
60bc520ef7SDmitri Tikhonov    [LSQVER_ID27] = "FF00001B",
61fb73393fSDmitri Tikhonov    [LSQVER_ID28] = "FF00001C",
624051ae3aSDmitri Tikhonov    [LSQVER_ID29] = "FF00001D",
635392f7a3SLiteSpeed Tech    [LSQVER_VERNEG] = "FAFAFAFA",
645392f7a3SLiteSpeed Tech};
655392f7a3SLiteSpeed Tech
665392f7a3SLiteSpeed Tech
6750aadb33SDmitri Tikhonovenum lsquic_version
6850aadb33SDmitri Tikhonovlsquic_str2ver (const char *str, size_t len)
6950aadb33SDmitri Tikhonov{
705392f7a3SLiteSpeed Tech    enum lsquic_version ver;
7150aadb33SDmitri Tikhonov    uint32_t tag;
7250aadb33SDmitri Tikhonov
7350aadb33SDmitri Tikhonov    if (len == sizeof(tag) && 'Q' == str[0])
7450aadb33SDmitri Tikhonov    {
7550aadb33SDmitri Tikhonov        memcpy(&tag, str, sizeof(tag));
7650aadb33SDmitri Tikhonov        return lsquic_tag2ver(tag);
7750aadb33SDmitri Tikhonov    }
7850aadb33SDmitri Tikhonov
795392f7a3SLiteSpeed Tech    for (ver = 0; ver < N_LSQVER; ++ver)
805392f7a3SLiteSpeed Tech        if (strlen(lsquic_ver2str[ver]) == len
815392f7a3SLiteSpeed Tech            && strncasecmp(lsquic_ver2str[ver], str, len) == 0)
825392f7a3SLiteSpeed Tech        {
835392f7a3SLiteSpeed Tech            return ver;
845392f7a3SLiteSpeed Tech        }
8550aadb33SDmitri Tikhonov
865392f7a3SLiteSpeed Tech    return -1;
875392f7a3SLiteSpeed Tech}
8850aadb33SDmitri Tikhonov
8950aadb33SDmitri Tikhonov
905392f7a3SLiteSpeed Techint
915392f7a3SLiteSpeed Techlsquic_gen_ver_tags (unsigned char *buf, size_t bufsz, unsigned version_bitmask)
925392f7a3SLiteSpeed Tech{
935392f7a3SLiteSpeed Tech    unsigned n;
945392f7a3SLiteSpeed Tech    lsquic_ver_tag_t tag;
955392f7a3SLiteSpeed Tech    unsigned char *p = buf;
965392f7a3SLiteSpeed Tech    unsigned char *const pend = p + bufsz;
975392f7a3SLiteSpeed Tech    for (n = 0; version_bitmask; ++n)
985392f7a3SLiteSpeed Tech    {
995392f7a3SLiteSpeed Tech        if (version_bitmask & (1 << n))
1005392f7a3SLiteSpeed Tech        {
1015392f7a3SLiteSpeed Tech            if (p + 4 > pend)
1025392f7a3SLiteSpeed Tech                return -1;
1035392f7a3SLiteSpeed Tech            version_bitmask &= ~(1 << n);
1045392f7a3SLiteSpeed Tech            tag = lsquic_ver2tag(n);
1055392f7a3SLiteSpeed Tech            if (0 == tag)
1065392f7a3SLiteSpeed Tech                return -1;
1075392f7a3SLiteSpeed Tech            memcpy(p, &tag, 4);
1085392f7a3SLiteSpeed Tech            p += 4;
1095392f7a3SLiteSpeed Tech        }
1105392f7a3SLiteSpeed Tech    }
1115392f7a3SLiteSpeed Tech    return p - buf;
1125392f7a3SLiteSpeed Tech}
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