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create nhtona macros

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This commit is contained in:
ruti 2024-08-05 22:46:39 +03:00
parent 0f2db6c247
commit 0130b7deb5
1 changed files with 10 additions and 14 deletions
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24
packets.c
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@ -17,6 +17,10 @@
#define ANTOHS(data, i) \
(uint16_t)((data[i] << 8) + (uint8_t)data[i + 1])
#define SHTONA(data, i, x) \
data[i] = (uint8_t)(x >> 8); \
data[i + 1] = x & 0xff;
char tls_data[517] = {
"\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03\x03\x5f"
@ -137,14 +141,10 @@ int change_tls_sni(const char *host, char *buffer, size_t bsize)
|| free_sz < diff) {
return -1;
}
uint16_t htons_sni2 = htons(old_sz + diff + 5);
uint16_t htons_sni4 = htons(old_sz + diff + 3);
uint16_t htons_sni7 = htons(old_sz + diff);
uint16_t htons_pad2 = htons(free_sz - diff);
memcpy(sni + 2, &htons_sni2, sizeof(htons_sni2));
memcpy(sni + 4, &htons_sni4, sizeof(htons_sni4));
memcpy(sni + 7, &htons_sni7, sizeof(htons_sni7));
memcpy(pad + 2, &htons_pad2, sizeof(htons_pad2));
SHTONA(sni, 2, old_sz + diff + 5);
SHTONA(sni, 4, old_sz + diff + 3);
SHTONA(sni, 7, old_sz + diff);
SHTONA(pad, 2, free_sz - diff);
char *host_end = sni + 9 + old_sz;
int oth_sz = bsize - (sni_offs + 9 + old_sz);
@ -414,11 +414,7 @@ int part_tls(char *buffer, size_t bsize, ssize_t n, long pos)
memmove(buffer + 5 + pos + 5, buffer + 5 + pos, n - (5 + pos));
memcpy(buffer + 5 + pos, buffer, 3);
uint16_t htons_pos = htons(pos);
memcpy(buffer + 3, &htons_pos, sizeof(htons_pos));
uint16_t htons_rsz_pos = htons(r_sz - pos);
memcpy(buffer + 5 + pos + 3, &htons_rsz_pos, sizeof(htons_rsz_pos));
SHTONA(buffer, 3, pos);
SHTONA(buffer, 5 + pos + 3, r_sz - pos);
return 5;
}