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wire: restore BE endian to wire headers for internal messages.

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We don't anticipate daemons across machines, but you never know.

Suggested-by: Christian Decker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-09-29 10:26:32 +09:30 committed by Christian Decker
parent 3d316518fd
commit 29b83aed2a
3 changed files with 12 additions and 9 deletions
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4
wire/wire_io.c
View File

@ -34,7 +34,7 @@ static int do_read_wire_header(int fd, struct io_plan_arg *arg)
/* Length bytes read? Set up for normal read of data. */
if (arg->u2.s == INSIDE_HEADER_BIT + HEADER_LEN) {
arg->u2.s = *(wire_len_t *)p;
arg->u2.s = wirelen_to_cpu(*(wire_len_t *)p);
if (arg->u2.s >= INSIDE_HEADER_BIT) {
errno = E2BIG;
return -1;
@ -88,7 +88,7 @@ static int do_write_wire_header(int fd, struct io_plan_arg *arg)
{
ssize_t ret;
size_t len = arg->u2.s & ~INSIDE_HEADER_BIT;
wire_len_t hdr = tal_count(arg->u1.const_vp);
wire_len_t hdr = cpu_to_wirelen(tal_count(arg->u1.const_vp));
ret = write(fd, (char *)&hdr + len, HEADER_LEN - len);
if (ret <= 0)

5
wire/wire_io.h
View File

@ -2,12 +2,15 @@
#define LIGHTNING_WIRE_WIRE_IO_H
#include "config.h"
#include <ccan/io/io.h>
#include <ccan/endian/endian.h>
#include <ccan/short_types/short_types.h>
/* We don't allow > 64M msgs: enough for 483 64k failure msgs. */
#define WIRE_LEN_LIMIT (1 << 26)
typedef u32 wire_len_t;
typedef be32 wire_len_t;
#define wirelen_to_cpu be32_to_cpu
#define cpu_to_wirelen cpu_to_be32
/* Read message into *data, allocating off ctx. */
struct io_plan *io_read_wire_(struct io_conn *conn,

12
wire/wire_sync.c
View File

@ -7,12 +7,12 @@
bool wire_sync_write(int fd, const void *msg TAKES)
{
wire_len_t len = tal_len(msg);
wire_len_t hdr = cpu_to_wirelen(tal_len(msg));
bool ret;
assert(tal_len(msg) < WIRE_LEN_LIMIT);
ret = write_all(fd, &len, sizeof(len))
&& write_all(fd, msg, len);
ret = write_all(fd, &hdr, sizeof(hdr))
&& write_all(fd, msg, tal_count(msg));
if (taken(msg))
tal_free(msg);
@ -26,12 +26,12 @@ u8 *wire_sync_read(const tal_t *ctx, int fd)
if (!read_all(fd, &len, sizeof(len)))
return NULL;
if (len >= WIRE_LEN_LIMIT) {
if (wirelen_to_cpu(len) >= WIRE_LEN_LIMIT) {
errno = E2BIG;
return NULL;
}
msg = tal_arr(ctx, u8, len);
if (!read_all(fd, msg, len))
msg = tal_arr(ctx, u8, wirelen_to_cpu(len));
if (!read_all(fd, msg, wirelen_to_cpu(len)))
return tal_free(msg);
return msg;
}