lsquic_version.c revision bc520ef7
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 850aadb33SDmitri Tikhonov 950aadb33SDmitri Tikhonovstatic const unsigned char version_tags[N_LSQVER][4] = 1050aadb33SDmitri Tikhonov{ 11c95974e9SDmitri Tikhonov [LSQVER_043] = { 'Q', '0', '4', '3', }, 12c7d81ce1SDmitri Tikhonov [LSQVER_046] = { 'Q', '0', '4', '6', }, 137a8b2eceSDmitri Tikhonov [LSQVER_050] = { 'Q', '0', '5', '0', }, 149626cfc2SDmitri Tikhonov#if LSQUIC_USE_Q098 159626cfc2SDmitri Tikhonov [LSQVER_098] = { 'Q', '0', '9', '8', }, 169626cfc2SDmitri Tikhonov#endif 179fc12041SDmitri Tikhonov [LSQVER_ID25] = { 0xFF, 0, 0, 25, }, 18bc520ef7SDmitri Tikhonov [LSQVER_ID27] = { 0xFF, 0, 0, 27, }, 195392f7a3SLiteSpeed Tech [LSQVER_VERNEG] = { 0xFA, 0xFA, 0xFA, 0xFA, }, 2050aadb33SDmitri Tikhonov}; 2150aadb33SDmitri Tikhonov 2250aadb33SDmitri Tikhonov 2350aadb33SDmitri Tikhonovuint32_t 2450aadb33SDmitri Tikhonovlsquic_ver2tag (unsigned version) 2550aadb33SDmitri Tikhonov{ 2650aadb33SDmitri Tikhonov lsquic_ver_tag_t tag; 2750aadb33SDmitri Tikhonov if (version < N_LSQVER) 2850aadb33SDmitri Tikhonov { 2950aadb33SDmitri Tikhonov memcpy(&tag, version_tags[version], 4); 3050aadb33SDmitri Tikhonov return tag; 3150aadb33SDmitri Tikhonov } 3250aadb33SDmitri Tikhonov else 3350aadb33SDmitri Tikhonov return 0; 3450aadb33SDmitri Tikhonov} 3550aadb33SDmitri Tikhonov 3650aadb33SDmitri Tikhonov 3750aadb33SDmitri Tikhonovenum lsquic_version 3850aadb33SDmitri Tikhonovlsquic_tag2ver (uint32_t ver_tag) 3950aadb33SDmitri Tikhonov{ 4050aadb33SDmitri Tikhonov unsigned n; 4150aadb33SDmitri Tikhonov for (n = 0; n < sizeof(version_tags) / sizeof(version_tags[0]); ++n) 4250aadb33SDmitri Tikhonov if (0 == memcmp(version_tags[n], &ver_tag, sizeof(ver_tag))) 4350aadb33SDmitri Tikhonov return n; 4450aadb33SDmitri Tikhonov return -1; 4550aadb33SDmitri Tikhonov} 4650aadb33SDmitri Tikhonov 4750aadb33SDmitri Tikhonov 485392f7a3SLiteSpeed Techconst char *const lsquic_ver2str[N_LSQVER] = { 495392f7a3SLiteSpeed Tech [LSQVER_043] = "Q043", 505392f7a3SLiteSpeed Tech [LSQVER_046] = "Q046", 517a8b2eceSDmitri Tikhonov [LSQVER_050] = "Q050", 525392f7a3SLiteSpeed Tech#if LSQUIC_USE_Q098 535392f7a3SLiteSpeed Tech [LSQVER_098] = "Q098", 545392f7a3SLiteSpeed Tech#endif 559fc12041SDmitri Tikhonov [LSQVER_ID25] = "FF000019", 56bc520ef7SDmitri Tikhonov [LSQVER_ID27] = "FF00001B", 575392f7a3SLiteSpeed Tech [LSQVER_VERNEG] = "FAFAFAFA", 585392f7a3SLiteSpeed Tech}; 595392f7a3SLiteSpeed Tech 605392f7a3SLiteSpeed Tech 6150aadb33SDmitri Tikhonovenum lsquic_version 6250aadb33SDmitri Tikhonovlsquic_str2ver (const char *str, size_t len) 6350aadb33SDmitri Tikhonov{ 645392f7a3SLiteSpeed Tech enum lsquic_version ver; 6550aadb33SDmitri Tikhonov uint32_t tag; 6650aadb33SDmitri Tikhonov 6750aadb33SDmitri Tikhonov if (len == sizeof(tag) && 'Q' == str[0]) 6850aadb33SDmitri Tikhonov { 6950aadb33SDmitri Tikhonov memcpy(&tag, str, sizeof(tag)); 7050aadb33SDmitri Tikhonov return lsquic_tag2ver(tag); 7150aadb33SDmitri Tikhonov } 7250aadb33SDmitri Tikhonov 735392f7a3SLiteSpeed Tech for (ver = 0; ver < N_LSQVER; ++ver) 745392f7a3SLiteSpeed Tech if (strlen(lsquic_ver2str[ver]) == len 755392f7a3SLiteSpeed Tech && strncasecmp(lsquic_ver2str[ver], str, len) == 0) 765392f7a3SLiteSpeed Tech { 775392f7a3SLiteSpeed Tech return ver; 785392f7a3SLiteSpeed Tech } 7950aadb33SDmitri Tikhonov 805392f7a3SLiteSpeed Tech return -1; 815392f7a3SLiteSpeed Tech} 8250aadb33SDmitri Tikhonov 8350aadb33SDmitri Tikhonov 845392f7a3SLiteSpeed Techint 855392f7a3SLiteSpeed Techlsquic_gen_ver_tags (unsigned char *buf, size_t bufsz, unsigned version_bitmask) 865392f7a3SLiteSpeed Tech{ 875392f7a3SLiteSpeed Tech unsigned n; 885392f7a3SLiteSpeed Tech lsquic_ver_tag_t tag; 895392f7a3SLiteSpeed Tech unsigned char *p = buf; 905392f7a3SLiteSpeed Tech unsigned char *const pend = p + bufsz; 915392f7a3SLiteSpeed Tech for (n = 0; version_bitmask; ++n) 925392f7a3SLiteSpeed Tech { 935392f7a3SLiteSpeed Tech if (version_bitmask & (1 << n)) 945392f7a3SLiteSpeed Tech { 955392f7a3SLiteSpeed Tech if (p + 4 > pend) 965392f7a3SLiteSpeed Tech return -1; 975392f7a3SLiteSpeed Tech version_bitmask &= ~(1 << n); 985392f7a3SLiteSpeed Tech tag = lsquic_ver2tag(n); 995392f7a3SLiteSpeed Tech if (0 == tag) 1005392f7a3SLiteSpeed Tech return -1; 1015392f7a3SLiteSpeed Tech memcpy(p, &tag, 4); 1025392f7a3SLiteSpeed Tech p += 4; 1035392f7a3SLiteSpeed Tech } 1045392f7a3SLiteSpeed Tech } 1055392f7a3SLiteSpeed Tech return p - buf; 1065392f7a3SLiteSpeed Tech} 107