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Flock: converted HCS to the parser framework

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This commit is contained in:
Maria Matejka 2024-10-03 23:02:58 +02:00
parent 20c3706efc
commit dc29cefb44
2 changed files with 90 additions and 215 deletions
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295
flock/ctl.c
View File

@ -19,134 +19,55 @@
* - 4 with array of strings = run the given command inside the hypervisor
*/
struct cbor_parser_context {
linpool *lp;
struct hcs_parser_context {
struct cbor_parser_context *ctx;
sock *sock;
PACKED enum {
CPE_TYPE = 0,
CPE_READ_INT,
CPE_COMPLETE_INT,
CPE_READ_BYTE,
} partial_state, partial_next;
byte type;
u64 value;
u64 partial_countdown;
u64 bytes_consumed;
byte *target_buf;
uint target_len;
u64 major_state;
const char *error;
#define LOCAL_STACK_MAX_DEPTH 3
u64 stack_countdown[LOCAL_STACK_MAX_DEPTH];
uint stack_pos;
/* Specific */
union flock_machine_config cfg;
};
#define CBOR_PARSER_ERROR(...) do { \
ctx->error = lp_sprintf(ctx->lp, __VA_ARGS__);\
return -(ctx->bytes_consumed + pos + 1); \
} while (0)
#define CBOR_PARSER_READ_INT(next) do { \
ctx->partial_state = CPE_READ_INT; \
ctx->partial_countdown = (1 << (ctx->value - 24)); \
ctx->value = 0; \
ctx->partial_next = next; \
} while (0)
struct cbor_parser_context *
struct hcs_parser_context *
hcs_parser_init(sock *s)
{
linpool *lp = lp_new(s->pool);
struct cbor_parser_context *ctx = lp_allocz(lp, sizeof *ctx);
struct cbor_parser_context *ctx = cbor_parser_new(s->pool, 4);
struct hcs_parser_context *htx = lp_allocz(ctx->lp, sizeof *htx);
ctx->lp = lp;
ctx->sock = s;
htx->ctx = ctx;
htx->sock = s;
ctx->type = 0xff;
ctx->stack_countdown[0] = 1;
return ctx;
return htx;
}
#define CBOR_PARSER_ERROR(...) do { \
ctx->error = lp_sprintf(ctx->lp, __VA_ARGS__);\
return -(htx->bytes_consumed + pos + 1); \
} while (0)
s64
hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
hcs_parse(struct hcs_parser_context *htx, const byte *buf, s64 size)
{
ASSERT_DIE(size > 0);
struct cbor_parser_context *ctx = htx->ctx;
for (int pos = 0; pos < size; pos++)
{
const byte bp = buf[pos];
bool value_is_special = 0;
bool exit_stack = false;
switch (ctx->partial_state)
switch (cbor_parse_byte(ctx, buf[pos]))
{
case CPE_TYPE:
/* Split the byte to type and value */
ctx->type = bp >> 5;
ctx->value = bp & 0x1f;
case CPR_ERROR:
/* Parser failure */
return -(htx->bytes_consumed + pos + 1);
if (ctx->type == 7)
{
if (ctx->value < 20)
CBOR_PARSER_ERROR("Unknown simple value %u", ctx->value);
else if (ctx->value < 24)
; /* false, true, null, undefined */
else if (ctx->value < 28)
{
/* Need more data */
CBOR_PARSER_READ_INT(CPE_COMPLETE_INT);
break;
}
else if (ctx->value == 31)
; /* break-stop */
else
CBOR_PARSER_ERROR("Unknown simple value %u", ctx->value);
}
else
{
if (ctx->value < 24)
; /* Immediate value, fall through */
else if (ctx->value < 28)
{
/* Need more data */
CBOR_PARSER_READ_INT(CPE_COMPLETE_INT);
break;
}
else if ((ctx->value == 31) && (ctx->type >= 2) && (ctx->type <= 5))
/* Indefinite length, fall through */
value_is_special = 1;
else
CBOR_PARSER_ERROR("Garbled additional value %u for type %u", ctx->value, ctx->type);
}
/* fall through */
case CPE_READ_INT:
if (ctx->partial_state == CPE_READ_INT)
{
/* Reading a network order integer */
ctx->value <<= 8;
ctx->value |= bp;
if (--ctx->partial_countdown)
break;
}
/* fall through */
case CPE_COMPLETE_INT:
/* TODO: exception for 7-31 end of long thing */
case CPR_MORE:
/* Need more bytes */
continue;
case CPR_MAJOR:
/* Check type acceptance */
switch (ctx->major_state)
switch (htx->major_state)
{
case 0: /* toplevel */
if (ctx->type != 5)
@ -155,7 +76,7 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->value != 1)
CBOR_PARSER_ERROR("Expected mapping of length 1, got %u", ctx->value);
ctx->major_state = 1;
htx->major_state = 1;
break;
case 1: /* inside toplevel mapping */
@ -165,7 +86,7 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->value >= 5)
CBOR_PARSER_ERROR("Command key too high, got %lu", ctx->value);
ctx->major_state = ctx->value + 2;
htx->major_state = ctx->value + 2;
break;
case 2: /* shutdown command: expected null */
@ -175,21 +96,21 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
log(L_INFO "Requested shutdown via CLI");
ev_send_loop(&main_birdloop, &poweroff_event);
{
struct cbor_writer *cw = cbor_init(ctx->sock->tbuf, ctx->sock->tbsize, ctx->lp);
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(ctx->sock, cw->pt);
sk_send(htx->sock, cw->pt);
}
ctx->major_state = 1;
htx->major_state = 1;
break;
case 3: /* telnet listener open */
if ((ctx->type == 7) && (ctx->value == 22))
{
hexp_get_telnet(ctx->sock, NULL);
ctx->major_state = 1;
hexp_get_telnet(htx->sock, NULL);
htx->major_state = 1;
break;
}
@ -197,7 +118,7 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
CBOR_PARSER_ERROR("Expected null or string, got %u-%u", ctx->type, ctx->value);
ASSERT_DIE(!ctx->target_buf);
ctx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
htx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
ctx->target_len = ctx->value;
break;
@ -207,21 +128,21 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
CBOR_PARSER_ERROR("Expected null, got %u-%u", ctx->type, ctx->value);
log(L_INFO "Requested telnet close");
ctx->major_state = 1;
htx->major_state = 1;
break;
case 5: /* machine creation request */
if (ctx->type != 5)
CBOR_PARSER_ERROR("Expected mapping, got %u", ctx->type);
ctx->major_state = 501;
htx->major_state = 501;
break;
case 6: /* machine shutdown request */
if (ctx->type != 5)
CBOR_PARSER_ERROR("Expecting mapping, got %u", ctx->type);
ctx->major_state = 601;
htx->major_state = 601;
break;
case 7: /* process spawner */
@ -235,21 +156,21 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->value >= 5)
CBOR_PARSER_ERROR("Command key too high, got %lu", ctx->value);
ctx->major_state = ctx->value + 502;
htx->major_state = ctx->value + 502;
break;
case 502: /* machine creation argument 0: name */
if (ctx->type != 3)
CBOR_PARSER_ERROR("Expected string, got %u", ctx->type);
if (value_is_special)
if (ctx->tflags & CPT_VARLEN)
CBOR_PARSER_ERROR("Variable length string not supported yet");
if (ctx->cfg.cf.name)
if (htx->cfg.cf.name)
CBOR_PARSER_ERROR("Duplicate argument 0 / name");
ASSERT_DIE(!ctx->target_buf);
ctx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
htx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
ctx->target_len = ctx->value;
break;
@ -257,28 +178,28 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->type != 0)
CBOR_PARSER_ERROR("Expected integer, got %u", ctx->type);
if (ctx->cfg.cf.type)
CBOR_PARSER_ERROR("Duplicate argument 1 / type, already have %d", ctx->cfg.cf.type);
if (htx->cfg.cf.type)
CBOR_PARSER_ERROR("Duplicate argument 1 / type, already have %d", htx->cfg.cf.type);
if ((ctx->value < 1) && (ctx->value > 1) )
CBOR_PARSER_ERROR("Unexpected type, got %lu", ctx->value);
ctx->cfg.cf.type = ctx->value;
ctx->major_state = 501;
htx->cfg.cf.type = ctx->value;
htx->major_state = 501;
break;
case 504: /* machine creation argument 2: workdir */
if (ctx->type != 2)
CBOR_PARSER_ERROR("Expected bytestring, got %u", ctx->type);
if (value_is_special)
if (ctx->tflags & CPT_VARLEN)
CBOR_PARSER_ERROR("Variable length string not supported yet");
if (ctx->cfg.container.workdir)
if (htx->cfg.container.workdir)
CBOR_PARSER_ERROR("Duplicate argument 2 / workdir");
ASSERT_DIE(!ctx->target_buf);
ctx->cfg.container.workdir = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
htx->cfg.container.workdir = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
ctx->target_len = ctx->value;
break;
@ -286,14 +207,14 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->type != 2)
CBOR_PARSER_ERROR("Expected bytestring, got %u", ctx->type);
if (value_is_special)
if (ctx->tflags & CPT_VARLEN)
CBOR_PARSER_ERROR("Variable length string not supported yet");
if (ctx->cfg.container.basedir)
if (htx->cfg.container.basedir)
CBOR_PARSER_ERROR("Duplicate argument 3 / basedir");
ASSERT_DIE(!ctx->target_buf);
ctx->cfg.container.basedir = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
htx->cfg.container.basedir = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
ctx->target_len = ctx->value;
break;
@ -304,74 +225,36 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
if (ctx->value >= 1)
CBOR_PARSER_ERROR("Command key too high, got %lu", ctx->value);
ctx->major_state = ctx->value + 602;
htx->major_state = ctx->value + 602;
break;
case 602: /* machine creation argument 0: name */
if (ctx->type != 3)
CBOR_PARSER_ERROR("Expected string, got %u", ctx->type);
if (value_is_special)
if (ctx->tflags & CPT_VARLEN)
CBOR_PARSER_ERROR("Variable length string not supported yet");
if (ctx->cfg.cf.name)
if (htx->cfg.cf.name)
CBOR_PARSER_ERROR("Duplicate argument 0 / name");
ASSERT_DIE(!ctx->target_buf);
ctx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
htx->cfg.cf.name = ctx->target_buf = lp_alloc(ctx->lp, ctx->value + 1);
ctx->target_len = ctx->value;
break;
default:
bug("invalid parser state");
}
/* Some types are completely parsed, some not yet */
switch (ctx->type)
{
case 0:
case 1:
case 7:
exit_stack = !--ctx->stack_countdown[ctx->stack_pos];
ctx->partial_state = CPE_TYPE;
break;
case 2:
case 3:
ctx->partial_state = CPE_READ_BYTE;
ctx->partial_countdown = ctx->value;
ctx->target_buf = ctx->target_buf ?: lp_allocu(
ctx->lp, ctx->target_len = (ctx->target_len ?: ctx->value));
break;
case 4:
case 5:
if (++ctx->stack_pos >= LOCAL_STACK_MAX_DEPTH)
CBOR_PARSER_ERROR("Stack too deep");
/* set array/map size;
* once for arrays, twice for maps;
* ~0 for indefinite */
ctx->stack_countdown[ctx->stack_pos] = value_is_special ? ~0ULL :
(ctx->value * (ctx->type - 3));
ctx->partial_state = CPE_TYPE;
break;
}
break;
case CPE_READ_BYTE:
*ctx->target_buf = bp;
ctx->target_buf++;
if (--ctx->target_len)
break;
/* Read completely! */
switch (ctx->major_state)
case CPR_STR_END:
/* Bytes read completely! */
switch (htx->major_state)
{
case 3:
hexp_get_telnet(ctx->sock, ctx->cfg.cf.name);
ctx->major_state = 1;
hexp_get_telnet(htx->sock, htx->cfg.cf.name);
htx->major_state = 1;
break;
case 5:
@ -381,103 +264,95 @@ hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size)
case 502:
case 504:
case 505:
ctx->major_state = 501;
htx->major_state = 501;
break;
case 602:
ctx->major_state = 601;
htx->major_state = 601;
break;
default:
bug("Unexpected state to end a (byte)string in");
/* Code to run at the end of a (byte)string */
}
ctx->target_buf = NULL;
ctx->partial_state = CPE_TYPE;
exit_stack = !--ctx->stack_countdown[ctx->stack_pos];
break;
}
/* End of array or map */
while (exit_stack)
while (cbor_parse_block_end(ctx))
{
switch (ctx->major_state)
switch (htx->major_state)
{
/* Code to run at the end of the mapping */
case 0: /* toplevel item ended */
ctx->major_state = ~0ULL;
htx->major_state = ~0ULL;
return pos + 1;
case 1:
ctx->major_state = 0;
htx->major_state = 0;
break;
case 5:
/* Finalize the command to exec in hypervisor */
CBOR_PARSER_ERROR("NOT IMPLEMENTED YET");
ctx->major_state = 1;
htx->major_state = 1;
break;
case 501:
if (!ctx->cfg.cf.type)
if (!htx->cfg.cf.type)
CBOR_PARSER_ERROR("Machine type not specified");
if (!ctx->cfg.cf.name)
if (!htx->cfg.cf.name)
CBOR_PARSER_ERROR("Machine name not specified");
if (!ctx->cfg.container.workdir)
if (!htx->cfg.container.workdir)
CBOR_PARSER_ERROR("Machine workdir not specified");
if (!ctx->cfg.container.basedir)
if (!htx->cfg.container.basedir)
CBOR_PARSER_ERROR("Machine basedir not specified");
hypervisor_container_request(
ctx->sock,
ctx->cfg.cf.name,
ctx->cfg.container.basedir,
ctx->cfg.container.workdir);
htx->sock,
htx->cfg.cf.name,
htx->cfg.container.basedir,
htx->cfg.container.workdir);
ctx->major_state = 1;
htx->major_state = 1;
break;
case 601:
if (!ctx->cfg.cf.name)
if (!htx->cfg.cf.name)
CBOR_PARSER_ERROR("Machine name not specified");
hypervisor_container_shutdown(ctx->sock, ctx->cfg.cf.name);
hypervisor_container_shutdown(htx->sock, htx->cfg.cf.name);
ctx->major_state = 1;
htx->major_state = 1;
break;
default:
bug("Unexpected state to end a mapping in");
}
/* Check exit from the next item */
ASSERT_DIE(ctx->stack_pos);
exit_stack = !--ctx->stack_countdown[--ctx->stack_pos];
}
}
ctx->bytes_consumed += size;
htx->bytes_consumed += size;
return size;
}
bool
hcs_complete(struct cbor_parser_context *ctx)
hcs_complete(struct hcs_parser_context *htx)
{
return ctx->major_state == ~0ULL;
return htx->major_state == ~0ULL;
}
const char *
hcs_error(struct cbor_parser_context *ctx)
hcs_error(struct hcs_parser_context *htx)
{
return ctx->error;
return htx->ctx->error;
}
void
hcs_parser_cleanup(struct cbor_parser_context *ctx)
hcs_parser_cleanup(struct hcs_parser_context *htx)
{
rfree(ctx->lp);
cbor_parser_free(htx->ctx);
}

10
flock/flock.h
View File

@ -22,11 +22,11 @@ struct flock_config {
extern struct flock_config flock_config;
struct cbor_parser_context *hcs_parser_init(sock *s);
s64 hcs_parse(struct cbor_parser_context *ctx, const byte *buf, s64 size);
void hcs_parser_cleanup(struct cbor_parser_context *ctx);
const char *hcs_error(struct cbor_parser_context *ctx);
bool hcs_complete(struct cbor_parser_context *ctx);
struct hcs_parser_context *hcs_parser_init(sock *s);
s64 hcs_parse(struct hcs_parser_context *ctx, const byte *buf, s64 size);
void hcs_parser_cleanup(struct hcs_parser_context *ctx);
const char *hcs_error(struct hcs_parser_context *ctx);
bool hcs_complete(struct hcs_parser_context *ctx);
void hexp_get_telnet(sock *, const char *name);