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Flock: hcs parser partial reworks (not building now)

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This commit is contained in:
Maria Matejka 2024-10-07 15:05:51 +02:00
parent df43110102
commit 7533cd6383
1 changed files with 72 additions and 43 deletions
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115
flock/ctl.c
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@ -10,34 +10,66 @@
/*
* Hand-written parser for a very simple CBOR protocol:
*
* - on toplevel always mapping of one element
* - key of the element may be:
* - 0 with NULL (7-22) = shutdown the hypervisor
* - 1 with NULL = open a telnet listener
* - 2 with NULL = close the telnet listener (if not used)
* - 3 with one string = create a machine of this name
* - 4 with array of strings = run the given command inside the hypervisor
* - on toplevel always array of three elements:
* - the ID (u64)
* - the command saying what to expect in the third element
* - 0 with NULL (7-22) = shutdown the hypervisor
* - 1 with NULL = open a telnet listener
* - 2 with one string = create a machine of this name
* - 3 with array of strings = run the given command inside the hypervisor
*/
struct hcs_parser_context {
struct cbor_parser_context *ctx;
struct cbor_stream *stream;
sock *sock;
u64 bytes_consumed;
u64 major_state;
};
struct hcs_parser_channel {
struct cbor_channel cch;
struct hcs_parser_context *htx;
enum {
HCS_CMD_SHUTDOWN = 1,
HCS_CMD_TELNET,
HCS_CMD_MACHINE_START,
HCS_CMD_MACHINE_STOP,
HCS_CMD__MAX,
} cmd;
/* Specific */
union flock_machine_config cfg;
};
static void
hcs_request_poweroff(struct hcs_parser_channel *hpc)
{
log(L_INFO "Requested shutdown via CLI");
ev_send_loop(&main_birdloop, &poweroff_event);
struct cbor_writer *cw = cbor_init(htx->sock->tbuf, htx->sock->tbsize, ctx->lp);
cbor_open_block_with_length(cw, 1);
cbor_add_int(cw, -1);
cbor_add_string(cw, "OK");
sk_send(htx->sock, cw->pt);
}
static void
hcs_get_telnet(struct hcs_parser_context *htx)
{
}
struct hcs_parser_context *
hcs_parser_init(sock *s)
{
struct cbor_parser_context *ctx = cbor_parser_new(s->pool, 4);
struct hcs_parser_context *htx = lp_allocz(ctx->lp, sizeof *htx);
struct hcs_parser_context *htx = mb_allocz(s->pool, sizeof *htx);
htx->ctx = ctx;
htx->sock = s;
htx->stream = cbor_stream_new(s->pool, 4);
return htx;
}
@ -55,6 +87,14 @@ hcs_parse(struct hcs_parser_context *htx, const byte *buf, s64 size)
for (int pos = 0; pos < size; pos++)
{
if (!htx->channel)
{
htx->channel = cbor_parse_channel(ctx, htx->stream, buf[pos]);
if (htx->channel == &cbor_channel_parse_error)
return -(htx->bytes_consumed + pos + 1);
continue;
}
switch (cbor_parse_byte(ctx, buf[pos]))
{
case CPR_ERROR:
@ -70,45 +110,42 @@ hcs_parse(struct hcs_parser_context *htx, const byte *buf, s64 size)
switch (htx->major_state)
{
case 0: /* toplevel */
if (ctx->type != 5)
CBOR_PARSER_ERROR("Expected mapping, got %u", ctx->type);
if (ctx->type != 4)
CBOR_PARSER_ERROR("Expected array, got %u", ctx->type);
if (ctx->value != 1)
CBOR_PARSER_ERROR("Expected mapping of length 1, got %u", ctx->value);
if (ctx->value != 3)
CBOR_PARSER_ERROR("Expected array of length 1, got %u", ctx->value);
htx->major_state = 1;
break;
case 1: /* inside toplevel mapping */
CBOR_PARSE_ONLY(ctx, POSINT, htx->major_state);
if (htx->major_state >= 5)
CBOR_PARSER_ERROR("Command key too high, got %lu", htx->major_state);
htx->major_state += 2;
case 1: /* ID */
CBOR_PARSE_ONLY(ctx, POSINT, htx->id);
htx->major_state = 2;
break;
case 2: /* shutdown command: expected null */
case 2: /* Command */
CBOR_PARSE_ONLY(ctx, POSINT, htx->cmd);
if (htx->cmd > HCS_CMD__MAX)
CBOR_PARSER_ERROR("Command key too high, got %lu", htx->cmd);
htx->major_state = htx->cmd + 10;
break;
case HCS_CMD_SHUTDOWN + 10: /* shutdown command: expected null */
if ((ctx->type != 7) || (ctx->value != 22))
CBOR_PARSER_ERROR("Expected null, got %u-%u", ctx->type, ctx->value);
log(L_INFO "Requested shutdown via CLI");
ev_send_loop(&main_birdloop, &poweroff_event);
{
struct cbor_writer *cw = cbor_init(htx->sock->tbuf, htx->sock->tbsize, ctx->lp);
cbor_open_block_with_length(cw, 1);
cbor_add_int(cw, -1);
cbor_add_string(cw, "OK");
sk_send(htx->sock, cw->pt);
}
hcs_request_poweroff(htx);
htx->major_state = 1;
htx->major_state = 3;
break;
case 3: /* telnet listener open */
case HCS_CMD_TELNET + 10: /* telnet listener open */
if ((ctx->type == 7) && (ctx->value == 22))
{
hexp_get_telnet(htx->sock, NULL);
htx->major_state = 1;
hcs_get_telnet(htx);
htx->major_state = 3;
break;
}
@ -118,22 +155,14 @@ hcs_parse(struct hcs_parser_context *htx, const byte *buf, s64 size)
CBOR_PARSER_ERROR("Expected null or string, got %s", cbor_type_str(ctx->type));
break;
case 4: /* telnet listener close */
if ((ctx->type != 7) || (ctx->value != 22))
CBOR_PARSER_ERROR("Expected null, got %u-%u", ctx->type, ctx->value);
log(L_INFO "Requested telnet close");
htx->major_state = 1;
break;
case 5: /* machine creation request */
case HCS_CMD_MACHINE_START + 10: /* machine creation request */
if (ctx->type != 5)
CBOR_PARSER_ERROR("Expected mapping, got %u", ctx->type);
htx->major_state = 501;
break;
case 6: /* machine shutdown request */
case HCS_CMD_MACHINE_STOP + 1: /* machine shutdown request */
if (ctx->type != 5)
CBOR_PARSER_ERROR("Expecting mapping, got %u", ctx->type);