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Diffstat (limited to 'src/sp/protocol/pair1/pair.c')
| -rw-r--r-- | src/sp/protocol/pair1/pair.c | 540 |
1 files changed, 540 insertions, 0 deletions
diff --git a/src/sp/protocol/pair1/pair.c b/src/sp/protocol/pair1/pair.c new file mode 100644 index 00000000..ba497c42 --- /dev/null +++ b/src/sp/protocol/pair1/pair.c @@ -0,0 +1,540 @@ +// +// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech> +// Copyright 2018 Capitar IT Group BV <info@capitar.com> +// +// This software is supplied under the terms of the MIT License, a +// copy of which should be located in the distribution where this +// file was obtained (LICENSE.txt). A copy of the license may also be +// found online at https://opensource.org/licenses/MIT. +// + +#include <stdlib.h> + +#include "core/nng_impl.h" +#include "nng/protocol/pair1/pair.h" + +// Pair protocol. The PAIRv1 protocol is a simple 1:1 messaging pattern. + +#ifdef NNG_ENABLE_STATS +#define BUMP_STAT(x) nni_stat_inc(x, 1) +#else +#define BUMP_STAT(x) +#endif + +typedef struct pair1_pipe pair1_pipe; +typedef struct pair1_sock pair1_sock; + +static void pair1_pipe_send_cb(void *); +static void pair1_pipe_recv_cb(void *); +static void pair1_pipe_get_cb(void *); +static void pair1_pipe_put_cb(void *); +static void pair1_pipe_fini(void *); + +// pair1_sock is our per-socket protocol private structure. +struct pair1_sock { + nni_msgq * uwq; + nni_msgq * urq; + nni_sock * sock; + bool raw; + pair1_pipe * p; + nni_atomic_int ttl; + nni_mtx mtx; +#ifdef NNG_ENABLE_STATS + nni_stat_item stat_poly; + nni_stat_item stat_raw; + nni_stat_item stat_reject_mismatch; + nni_stat_item stat_reject_already; + nni_stat_item stat_ttl_drop; + nni_stat_item stat_rx_malformed; + nni_stat_item stat_tx_malformed; + nni_stat_item stat_tx_drop; +#endif +#ifdef NNG_TEST_LIB + bool inject_header; +#endif +}; + +// pair1_pipe is our per-pipe protocol private structure. +struct pair1_pipe { + nni_pipe * pipe; + pair1_sock *pair; + nni_aio aio_send; + nni_aio aio_recv; + nni_aio aio_get; + nni_aio aio_put; +}; + +static void +pair1_sock_fini(void *arg) +{ + pair1_sock *s = arg; + + nni_mtx_fini(&s->mtx); +} + +#ifdef NNG_ENABLE_STATS +static void +pair1_add_sock_stat( + pair1_sock *s, nni_stat_item *item, const nni_stat_info *info) +{ + nni_stat_init(item, info); + nni_sock_add_stat(s->sock, item); +} +#endif + +static int +pair1_sock_init_impl(void *arg, nni_sock *sock, bool raw) +{ + pair1_sock *s = arg; + + // Raw mode uses this. + nni_mtx_init(&s->mtx); + s->sock = sock; + +#ifdef NNG_ENABLE_STATS + static const nni_stat_info poly_info = { + .si_name = "poly", + .si_desc = "polyamorous mode?", + .si_type = NNG_STAT_BOOLEAN, + }; + static const nni_stat_info raw_info = { + .si_name = "raw", + .si_desc = "raw mode?", + .si_type = NNG_STAT_BOOLEAN, + }; + static const nni_stat_info mismatch_info = { + .si_name = "mismatch", + .si_desc = "pipes rejected (protocol mismatch)", + .si_type = NNG_STAT_COUNTER, + .si_atomic = true, + }; + static const nni_stat_info already_info = { + .si_name = "already", + .si_desc = "pipes rejected (already connected)", + .si_type = NNG_STAT_COUNTER, + .si_atomic = true, + }; + static const nni_stat_info ttl_drop_info = { + .si_name = "ttl_drop", + .si_desc = "messages dropped due to too many hops", + .si_type = NNG_STAT_COUNTER, + .si_unit = NNG_UNIT_MESSAGES, + .si_atomic = true, + }; + static const nni_stat_info tx_drop_info = { + .si_name = "tx_drop", + .si_desc = "messages dropped undeliverable", + .si_type = NNG_STAT_COUNTER, + .si_unit = NNG_UNIT_MESSAGES, + .si_atomic = true, + }; + static const nni_stat_info rx_malformed_info = { + .si_name = "rx_malformed", + .si_desc = "malformed messages received", + .si_type = NNG_STAT_COUNTER, + .si_unit = NNG_UNIT_MESSAGES, + .si_atomic = true, + }; + static const nni_stat_info tx_malformed_info = { + .si_name = "tx_malformed", + .si_desc = "malformed messages not sent", + .si_type = NNG_STAT_COUNTER, + .si_unit = NNG_UNIT_MESSAGES, + .si_atomic = true, + }; + + pair1_add_sock_stat(s, &s->stat_poly, &poly_info); + pair1_add_sock_stat(s, &s->stat_raw, &raw_info); + pair1_add_sock_stat(s, &s->stat_reject_mismatch, &mismatch_info); + pair1_add_sock_stat(s, &s->stat_reject_already, &already_info); + pair1_add_sock_stat(s, &s->stat_ttl_drop, &ttl_drop_info); + pair1_add_sock_stat(s, &s->stat_tx_drop, &tx_drop_info); + pair1_add_sock_stat(s, &s->stat_rx_malformed, &rx_malformed_info); + + if (raw) { + // This stat only makes sense in raw mode. + pair1_add_sock_stat( + s, &s->stat_tx_malformed, &tx_malformed_info); + } + + nni_stat_set_bool(&s->stat_raw, raw); + nni_stat_set_bool(&s->stat_poly, false); +#endif + + s->raw = raw; + s->uwq = nni_sock_sendq(sock); + s->urq = nni_sock_recvq(sock); + nni_atomic_init(&s->ttl); + nni_atomic_set(&s->ttl, 8); + + return (0); +} + +static int +pair1_sock_init(void *arg, nni_sock *sock) +{ + return (pair1_sock_init_impl(arg, sock, false)); +} + +static int +pair1_sock_init_raw(void *arg, nni_sock *sock) +{ + return (pair1_sock_init_impl(arg, sock, true)); +} + +static void +pair1_pipe_stop(void *arg) +{ + pair1_pipe *p = arg; + pair1_sock *s = p->pair; + + nni_mtx_lock(&s->mtx); + if (s->p == p) { + s->p = NULL; + } + nni_mtx_unlock(&s->mtx); + nni_aio_stop(&p->aio_send); + nni_aio_stop(&p->aio_recv); + nni_aio_stop(&p->aio_put); + nni_aio_stop(&p->aio_get); +} + +static void +pair1_pipe_fini(void *arg) +{ + pair1_pipe *p = arg; + + nni_aio_fini(&p->aio_send); + nni_aio_fini(&p->aio_recv); + nni_aio_fini(&p->aio_put); + nni_aio_fini(&p->aio_get); +} + +static int +pair1_pipe_init(void *arg, nni_pipe *pipe, void *pair) +{ + pair1_pipe *p = arg; + + nni_aio_init(&p->aio_send, pair1_pipe_send_cb, p); + nni_aio_init(&p->aio_recv, pair1_pipe_recv_cb, p); + nni_aio_init(&p->aio_get, pair1_pipe_get_cb, p); + nni_aio_init(&p->aio_put, pair1_pipe_put_cb, p); + + p->pipe = pipe; + p->pair = pair; + + return (0); +} + +static int +pair1_pipe_start(void *arg) +{ + pair1_pipe *p = arg; + pair1_sock *s = p->pair; + + if (nni_pipe_peer(p->pipe) != NNG_PAIR1_PEER) { + BUMP_STAT(&s->stat_reject_mismatch); + // Peer protocol mismatch. + return (NNG_EPROTO); + } + + nni_mtx_lock(&s->mtx); + if (s->p != NULL) { + nni_mtx_unlock(&s->mtx); + BUMP_STAT(&s->stat_reject_already); + return (NNG_EBUSY); + } + s->p = p; + nni_mtx_unlock(&s->mtx); + + // Schedule a get. + nni_msgq_aio_get(s->uwq, &p->aio_get); + + // And the pipe read of course. + nni_pipe_recv(p->pipe, &p->aio_recv); + + return (0); +} + +static void +pair1_pipe_close(void *arg) +{ + pair1_pipe *p = arg; + + nni_aio_close(&p->aio_send); + nni_aio_close(&p->aio_recv); + nni_aio_close(&p->aio_put); + nni_aio_close(&p->aio_get); +} + +static void +pair1_pipe_recv_cb(void *arg) +{ + pair1_pipe *p = arg; + pair1_sock *s = p->pair; + nni_msg * msg; + uint32_t hdr; + nni_pipe * pipe = p->pipe; + size_t len; + + if (nni_aio_result(&p->aio_recv) != 0) { + nni_pipe_close(p->pipe); + return; + } + + msg = nni_aio_get_msg(&p->aio_recv); + nni_aio_set_msg(&p->aio_recv, NULL); + + // Store the pipe ID. + nni_msg_set_pipe(msg, nni_pipe_id(p->pipe)); + + // If the message is missing the hop count header, scrap it. + if ((nni_msg_len(msg) < sizeof(uint32_t)) || + ((hdr = nni_msg_trim_u32(msg)) > 0xff)) { + BUMP_STAT(&s->stat_rx_malformed); + nni_msg_free(msg); + nni_pipe_close(pipe); + return; + } + + len = nni_msg_len(msg); + + // If we bounced too many times, discard the message, but + // keep getting more. + if ((int) hdr > nni_atomic_get(&s->ttl)) { + BUMP_STAT(&s->stat_ttl_drop); + nni_msg_free(msg); + nni_pipe_recv(pipe, &p->aio_recv); + return; + } + + // Store the hop count in the header. + nni_msg_header_append_u32(msg, hdr); + + // Send the message up. + nni_aio_set_msg(&p->aio_put, msg); + nni_sock_bump_rx(s->sock, len); + nni_msgq_aio_put(s->urq, &p->aio_put); +} + +static void +pair1_pipe_put_cb(void *arg) +{ + pair1_pipe *p = arg; + + if (nni_aio_result(&p->aio_put) != 0) { + nni_msg_free(nni_aio_get_msg(&p->aio_put)); + nni_aio_set_msg(&p->aio_put, NULL); + nni_pipe_close(p->pipe); + return; + } + nni_pipe_recv(p->pipe, &p->aio_recv); +} + +static void +pair1_pipe_get_cb(void *arg) +{ + pair1_pipe *p = arg; + pair1_sock *s = p->pair; + nni_msg * msg; + uint32_t hops; + + if (nni_aio_result(&p->aio_get) != 0) { + nni_pipe_close(p->pipe); + return; + } + + msg = nni_aio_get_msg(&p->aio_get); + nni_aio_set_msg(&p->aio_get, NULL); + + // Raw mode messages have the header already formed, with a hop count. + // Cooked mode messages have no header so we have to add one. + if (s->raw) { + if ((nni_msg_header_len(msg) != sizeof(uint32_t)) || + ((hops = nni_msg_header_trim_u32(msg)) > 254)) { + BUMP_STAT(&s->stat_tx_malformed); + nni_msg_free(msg); + nni_msgq_aio_get(s->uwq, &p->aio_get); + return; + } +#if NNG_TEST_LIB + } else if (s->inject_header) { + nni_aio_set_msg(&p->aio_send, msg); + nni_pipe_send(p->pipe, &p->aio_send); + return; +#endif + } else { + // Strip off any previously existing header, such as when + // replying to messages. + nni_msg_header_clear(msg); + hops = 0; + } + + hops++; + + // Insert the hops header. + nni_msg_header_append_u32(msg, hops); + + nni_aio_set_msg(&p->aio_send, msg); + nni_pipe_send(p->pipe, &p->aio_send); +} + +static void +pair1_pipe_send_cb(void *arg) +{ + pair1_pipe *p = arg; + pair1_sock *s = p->pair; + + if (nni_aio_result(&p->aio_send) != 0) { + nni_msg_free(nni_aio_get_msg(&p->aio_send)); + nni_aio_set_msg(&p->aio_send, NULL); + nni_pipe_close(p->pipe); + return; + } + + nni_msgq_aio_get(s->uwq, &p->aio_get); +} + +static void +pair1_sock_open(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +pair1_sock_close(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static int +pair1_sock_set_max_ttl(void *arg, const void *buf, size_t sz, nni_opt_type t) +{ + pair1_sock *s = arg; + int rv; + int ttl; + + if ((rv = nni_copyin_int(&ttl, buf, sz, 1, NNI_MAX_MAX_TTL, t)) == 0) { + nni_atomic_set(&s->ttl, ttl); + } + + return (rv); +} + +static int +pair1_sock_get_max_ttl(void *arg, void *buf, size_t *szp, nni_opt_type t) +{ + pair1_sock *s = arg; + return (nni_copyout_int(nni_atomic_get(&s->ttl), buf, szp, t)); +} + +#ifdef NNG_TEST_LIB +static int +pair1_set_test_inject_header(void *arg, const void *buf, size_t sz, nni_type t) +{ + pair1_sock *s = arg; + int rv; + nni_mtx_lock(&s->mtx); + rv = nni_copyin_bool(&s->inject_header, buf, sz, t); + nni_mtx_unlock(&s->mtx); + return (rv); +} +#endif + +static void +pair1_sock_send(void *arg, nni_aio *aio) +{ + pair1_sock *s = arg; + + nni_sock_bump_tx(s->sock, nni_msg_len(nni_aio_get_msg(aio))); + nni_msgq_aio_put(s->uwq, aio); +} + +static void +pair1_sock_recv(void *arg, nni_aio *aio) +{ + pair1_sock *s = arg; + + nni_msgq_aio_get(s->urq, aio); +} + +static nni_proto_pipe_ops pair1_pipe_ops = { + .pipe_size = sizeof(pair1_pipe), + .pipe_init = pair1_pipe_init, + .pipe_fini = pair1_pipe_fini, + .pipe_start = pair1_pipe_start, + .pipe_close = pair1_pipe_close, + .pipe_stop = pair1_pipe_stop, +}; + +static nni_option pair1_sock_options[] = { + { + .o_name = NNG_OPT_MAXTTL, + .o_get = pair1_sock_get_max_ttl, + .o_set = pair1_sock_set_max_ttl, + }, +#ifdef NNG_TEST_LIB + { + // Test only option to pass header unmolested. This allows + // us to inject bad header contents. + .o_name = "pair1_test_inject_header", + .o_set = pair1_set_test_inject_header, + }, +#endif + // terminate list + { + .o_name = NULL, + }, +}; + +static nni_proto_sock_ops pair1_sock_ops = { + .sock_size = sizeof(pair1_sock), + .sock_init = pair1_sock_init, + .sock_fini = pair1_sock_fini, + .sock_open = pair1_sock_open, + .sock_close = pair1_sock_close, + .sock_recv = pair1_sock_recv, + .sock_send = pair1_sock_send, + .sock_options = pair1_sock_options, +}; + +static nni_proto pair1_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNG_PAIR1_SELF, NNG_PAIR1_SELF_NAME }, + .proto_peer = { NNG_PAIR1_PEER, NNG_PAIR1_PEER_NAME }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV, + .proto_sock_ops = &pair1_sock_ops, + .proto_pipe_ops = &pair1_pipe_ops, +}; + +int +nng_pair1_open(nng_socket *sock) +{ + return (nni_proto_open(sock, &pair1_proto)); +} + +static nni_proto_sock_ops pair1_sock_ops_raw = { + .sock_size = sizeof(pair1_sock), + .sock_init = pair1_sock_init_raw, + .sock_fini = pair1_sock_fini, + .sock_open = pair1_sock_open, + .sock_close = pair1_sock_close, + .sock_recv = pair1_sock_recv, + .sock_send = pair1_sock_send, + .sock_options = pair1_sock_options, +}; + +static nni_proto pair1_proto_raw = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNG_PAIR1_SELF, NNG_PAIR1_SELF_NAME }, + .proto_peer = { NNG_PAIR1_PEER, NNG_PAIR1_PEER_NAME }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV | NNI_PROTO_FLAG_RAW, + .proto_sock_ops = &pair1_sock_ops_raw, + .proto_pipe_ops = &pair1_pipe_ops, +}; + +int +nng_pair1_open_raw(nng_socket *sock) +{ + return (nni_proto_open(sock, &pair1_proto_raw)); +} |