mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-23 02:01:55 +00:00
299 lines
6.9 KiB
C
299 lines
6.9 KiB
C
#include "lib/birdlib.h"
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#include "lib/cbor.h"
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#include "lib/string.h"
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#include "lib/io-loop.h"
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#include "flock/flock.h"
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#include <stdlib.h>
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/*
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* Hand-written parser for a very simple CBOR protocol:
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*
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* - on toplevel always mapping of one element
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* - key of the element may be:
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* - 0 with NULL (7-22) = shutdown the hypervisor
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* - 1 with NULL = open a telnet listener
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* - 2 with NULL = close the telnet listener (if not used)
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* - 3 with one string = create a machine of this name
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* - 4 with array of strings = run the given command inside the hypervisor
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*/
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struct hcs_parser_context {
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struct cbor_parser_context *ctx;
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sock *sock;
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u64 bytes_consumed;
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u64 major_state;
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/* Specific */
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union flock_machine_config cfg;
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};
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struct hcs_parser_context *
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hcs_parser_init(sock *s)
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{
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struct cbor_parser_context *ctx = cbor_parser_new(s->pool, 4);
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struct hcs_parser_context *htx = lp_allocz(ctx->lp, sizeof *htx);
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htx->ctx = ctx;
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htx->sock = s;
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return htx;
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}
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#define CBOR_PARSER_ERROR(...) do { \
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ctx->error = lp_sprintf(ctx->lp, __VA_ARGS__);\
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return -(htx->bytes_consumed + pos + 1); \
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} while (0)
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s64
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hcs_parse(struct hcs_parser_context *htx, const byte *buf, s64 size)
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{
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ASSERT_DIE(size > 0);
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struct cbor_parser_context *ctx = htx->ctx;
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for (int pos = 0; pos < size; pos++)
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{
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switch (cbor_parse_byte(ctx, buf[pos]))
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{
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case CPR_ERROR:
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/* Parser failure */
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return -(htx->bytes_consumed + pos + 1);
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case CPR_MORE:
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/* Need more bytes */
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continue;
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case CPR_MAJOR:
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/* Check type acceptance */
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switch (htx->major_state)
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{
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case 0: /* toplevel */
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if (ctx->type != 5)
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CBOR_PARSER_ERROR("Expected mapping, got %u", ctx->type);
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if (ctx->value != 1)
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CBOR_PARSER_ERROR("Expected mapping of length 1, got %u", ctx->value);
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htx->major_state = 1;
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break;
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case 1: /* inside toplevel mapping */
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CBOR_PARSE_ONLY(ctx, POSINT, htx->major_state);
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if (htx->major_state >= 5)
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CBOR_PARSER_ERROR("Command key too high, got %lu", htx->major_state);
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htx->major_state += 2;
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break;
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case 2: /* shutdown command: expected null */
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if ((ctx->type != 7) || (ctx->value != 22))
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CBOR_PARSER_ERROR("Expected null, got %u-%u", ctx->type, ctx->value);
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log(L_INFO "Requested shutdown via CLI");
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ev_send_loop(&main_birdloop, &poweroff_event);
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{
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struct cbor_writer *cw = cbor_init(htx->sock->tbuf, htx->sock->tbsize, ctx->lp);
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cbor_open_block_with_length(cw, 1);
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cbor_add_int(cw, -1);
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cbor_add_string(cw, "OK");
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sk_send(htx->sock, cw->pt);
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}
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htx->major_state = 1;
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break;
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case 3: /* telnet listener open */
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if ((ctx->type == 7) && (ctx->value == 22))
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{
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hexp_get_telnet(htx->sock, NULL);
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htx->major_state = 1;
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break;
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}
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else CBOR_PARSE_IF(ctx, TEXT, htx->cfg.cf.name)
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;
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else
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CBOR_PARSER_ERROR("Expected null or string, got %s", cbor_type_str(ctx->type));
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break;
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case 4: /* telnet listener close */
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if ((ctx->type != 7) || (ctx->value != 22))
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CBOR_PARSER_ERROR("Expected null, got %u-%u", ctx->type, ctx->value);
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log(L_INFO "Requested telnet close");
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htx->major_state = 1;
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break;
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case 5: /* machine creation request */
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if (ctx->type != 5)
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CBOR_PARSER_ERROR("Expected mapping, got %u", ctx->type);
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htx->major_state = 501;
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break;
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case 6: /* machine shutdown request */
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if (ctx->type != 5)
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CBOR_PARSER_ERROR("Expecting mapping, got %u", ctx->type);
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htx->major_state = 601;
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break;
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case 7: /* process spawner */
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bug("process spawner not implemented");
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break;
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case 501: /* machine creation argument */
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CBOR_PARSE_ONLY(ctx, POSINT, htx->major_state);
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if (ctx->value >= 5)
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CBOR_PARSER_ERROR("Command key too high, got %lu", ctx->value);
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htx->major_state += 502;
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break;
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case 502: /* machine creation argument 0: name */
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CBOR_PARSE_ONLY(ctx, TEXT, htx->cfg.cf.name);
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break;
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case 503: /* machine creation argument 1: type */
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CBOR_PARSE_ONLY(ctx, POSINT, htx->cfg.cf.type);
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if ((ctx->value < 1) && (ctx->value > 1) )
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CBOR_PARSER_ERROR("Unexpected type, got %lu", ctx->value);
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htx->major_state = 501;
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break;
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case 504: /* machine creation argument 2: basedir */
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CBOR_PARSE_ONLY(ctx, BYTES, htx->cfg.container.basedir);
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break;
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case 505: /* machine creation argument 3: workdir */
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CBOR_PARSE_ONLY(ctx, BYTES, htx->cfg.container.workdir);
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break;
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case 601: /* machine shutdown argument */
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CBOR_PARSE_ONLY(ctx, POSINT, htx->major_state);
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if (ctx->value >= 5)
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CBOR_PARSER_ERROR("Command key too high, got %lu", ctx->value);
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htx->major_state += 602;
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break;
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case 602: /* machine creation argument 0: name */
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CBOR_PARSE_ONLY(ctx, TEXT, htx->cfg.cf.name);
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break;
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default:
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bug("invalid parser state");
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}
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break;
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case CPR_STR_END:
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/* Bytes read completely! */
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switch (htx->major_state)
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{
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case 3:
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hexp_get_telnet(htx->sock, htx->cfg.cf.name);
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htx->major_state = 1;
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break;
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case 502:
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case 504:
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case 505:
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htx->major_state = 501;
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break;
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case 602:
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htx->major_state = 601;
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break;
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default:
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bug("Unexpected state to end a (byte)string in");
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/* Code to run at the end of a (byte)string */
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}
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break;
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}
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/* End of array or map */
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while (cbor_parse_block_end(ctx))
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{
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switch (htx->major_state)
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{
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/* Code to run at the end of the mapping */
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case 0: /* toplevel item ended */
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htx->major_state = ~0ULL;
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return pos + 1;
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case 1:
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htx->major_state = 0;
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break;
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case 5:
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/* Finalize the command to exec in hypervisor */
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CBOR_PARSER_ERROR("NOT IMPLEMENTED YET");
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htx->major_state = 1;
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break;
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case 501:
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if (!htx->cfg.cf.type)
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CBOR_PARSER_ERROR("Machine type not specified");
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if (!htx->cfg.cf.name)
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CBOR_PARSER_ERROR("Machine name not specified");
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if (!htx->cfg.container.workdir)
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CBOR_PARSER_ERROR("Machine workdir not specified");
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if (!htx->cfg.container.basedir)
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CBOR_PARSER_ERROR("Machine basedir not specified");
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hypervisor_container_request(
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htx->sock,
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htx->cfg.cf.name,
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htx->cfg.container.basedir,
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htx->cfg.container.workdir);
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htx->major_state = 1;
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break;
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case 601:
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if (!htx->cfg.cf.name)
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CBOR_PARSER_ERROR("Machine name not specified");
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hypervisor_container_shutdown(htx->sock, htx->cfg.cf.name);
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htx->major_state = 1;
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break;
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default:
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bug("Unexpected state to end a mapping in");
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}
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}
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}
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htx->bytes_consumed += size;
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return size;
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}
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bool
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hcs_complete(struct hcs_parser_context *htx)
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{
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return htx->major_state == ~0ULL;
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}
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const char *
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hcs_error(struct hcs_parser_context *htx)
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{
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return htx->ctx->error;
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}
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void
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hcs_parser_cleanup(struct hcs_parser_context *htx)
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{
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cbor_parser_free(htx->ctx);
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}
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