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Fix ntohs() that should have been htons()

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Fixes bug 23106; bugfix on 0.2.4.8-alpha.

Fortunately, we only support big-endian and little-endian platforms,
and on both of those, hton*() and ntoh*() behave the same.  And if
we did start to support middle endian systems (haha, no), most of
_those_ have hton*(x) == ntoh*(x) too.
This commit is contained in:
Nick Mathewson 2017-08-04 12:17:53 -04:00
parent 32b4fd5be9
commit 3b646bf887
2 changed files with 6 additions and 1 deletions
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5
changes/bug23106 Normal file
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@ -0,0 +1,5 @@
o Minor bugfixes (code correctness):
- Call htons() in extend_cell_format() for encoding a 16-bit
value. Previously we used ntohs(), which happens to behave the
same on all the platforms we support, but which isn't really
correct. Fixes bug 23106; bugfix on 0.2.4.8-alpha.

2
src/or/onion.c
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@ -1219,7 +1219,7 @@ extend_cell_format(uint8_t *command_out, uint16_t *len_out,
*command_out = RELAY_COMMAND_EXTEND; *command_out = RELAY_COMMAND_EXTEND;
*len_out = 6 + TAP_ONIONSKIN_CHALLENGE_LEN + DIGEST_LEN; *len_out = 6 + TAP_ONIONSKIN_CHALLENGE_LEN + DIGEST_LEN;
set_uint32(p, tor_addr_to_ipv4n(&cell_in->orport_ipv4.addr)); set_uint32(p, tor_addr_to_ipv4n(&cell_in->orport_ipv4.addr));
set_uint16(p+4, ntohs(cell_in->orport_ipv4.port)); set_uint16(p+4, htons(cell_in->orport_ipv4.port));
if (cell_in->create_cell.handshake_type == ONION_HANDSHAKE_TYPE_NTOR) { if (cell_in->create_cell.handshake_type == ONION_HANDSHAKE_TYPE_NTOR) {
memcpy(p+6, NTOR_CREATE_MAGIC, 16); memcpy(p+6, NTOR_CREATE_MAGIC, 16);
memcpy(p+22, cell_in->create_cell.onionskin, NTOR_ONIONSKIN_LEN); memcpy(p+22, cell_in->create_cell.onionskin, NTOR_ONIONSKIN_LEN);