blob: fc5d58348bbcb49daa2481252a7d39fe8e6ff146 [file] [log] [blame]
/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
#define _GNU_SOURCE
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "libmctp.h"
#include "libmctp-serial.h"
#include "libmctp-astlpc.h"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#define __unused __attribute__((unused))
static const mctp_eid_t local_eid_default = 8;
static char sockname[] = "\0mctp-mux";
struct binding {
const char *name;
int (*init)(struct mctp *mctp, struct binding *binding,
mctp_eid_t eid, int n_params,
char * const * params);
int (*get_fd)(struct binding *binding);
int (*process)(struct binding *binding);
void *data;
};
struct client {
bool active;
int sock;
uint8_t type;
};
struct ctx {
struct mctp *mctp;
struct binding *binding;
bool verbose;
int local_eid;
void *buf;
size_t buf_size;
int sock;
struct pollfd *pollfds;
struct client *clients;
int n_clients;
};
static void tx_message(struct ctx *ctx, mctp_eid_t eid, void *msg, size_t len)
{
mctp_message_tx(ctx->mctp, eid, msg, len);
}
static void client_remove_inactive(struct ctx *ctx)
{
int i;
for (i = 0; i < ctx->n_clients; i++) {
struct client *client = &ctx->clients[i];
if (client->active)
continue;
close(client->sock);
ctx->n_clients--;
memmove(&ctx->clients[i], &ctx->clients[i+1],
(ctx->n_clients - i) * sizeof(*ctx->clients));
ctx->clients = realloc(ctx->clients,
ctx->n_clients * sizeof(*ctx->clients));
}
}
static void rx_message(uint8_t eid, void *data, void *msg, size_t len)
{
struct ctx *ctx = data;
struct iovec iov[2];
struct msghdr msghdr;
bool removed;
uint8_t type;
int i, rc;
if (len < 2)
return;
type = *(uint8_t *)msg;
if (ctx->verbose)
fprintf(stderr, "MCTP message received: len %zd, type %d\n",
len, type);
memset(&msghdr, 0, sizeof(msghdr));
msghdr.msg_iov = iov;
msghdr.msg_iovlen = 2;
iov[0].iov_base = &eid;
iov[0].iov_len = 1;
iov[1].iov_base = msg;
iov[1].iov_len = len;
for (i = 0; i < ctx->n_clients; i++) {
struct client *client = &ctx->clients[i];
if (client->type != type)
continue;
if (ctx->verbose)
fprintf(stderr, " forwarding to client %d\n", i);
rc = sendmsg(client->sock, &msghdr, 0);
if (rc != (ssize_t)(len + 1)) {
client->active = false;
removed = true;
}
}
if (removed)
client_remove_inactive(ctx);
}
static int binding_null_init(struct mctp *mctp __unused,
struct binding *binding __unused,
mctp_eid_t eid __unused,
int n_params, char * const *params __unused)
{
if (n_params != 0) {
warnx("null binding doesn't accept parameters");
return -1;
}
return 0;
}
static int binding_serial_init(struct mctp *mctp, struct binding *binding,
mctp_eid_t eid, int n_params, char * const *params)
{
struct mctp_binding_serial *serial;
const char *path;
int rc;
if (n_params != 1) {
warnx("serial binding requires device param");
return -1;
}
path = params[0];
serial = mctp_serial_init();
assert(serial);
rc = mctp_serial_open_path(serial, path);
if (rc)
return -1;
mctp_register_bus(mctp, mctp_binding_serial_core(serial), eid);
binding->data = serial;
return 0;
}
static int binding_serial_get_fd(struct binding *binding)
{
return mctp_serial_get_fd(binding->data);
}
static int binding_serial_process(struct binding *binding)
{
return mctp_serial_read(binding->data);
}
static int binding_astlpc_init(struct mctp *mctp, struct binding *binding,
mctp_eid_t eid, int n_params,
char * const *params __attribute__((unused)))
{
struct mctp_binding_astlpc *astlpc;
if (n_params) {
warnx("astlpc binding does not accept parameters");
return -1;
}
astlpc = mctp_astlpc_init_fileio();
if (!astlpc) {
warnx("could not initialise astlpc binding");
return -1;
}
mctp_register_bus(mctp, mctp_binding_astlpc_core(astlpc), eid);
binding->data = astlpc;
return 0;
}
static int binding_astlpc_get_fd(struct binding *binding)
{
return mctp_astlpc_get_fd(binding->data);
}
static int binding_astlpc_process(struct binding *binding)
{
return mctp_astlpc_poll(binding->data);
}
struct binding bindings[] = {
{
.name = "null",
.init = binding_null_init,
},
{
.name = "serial",
.init = binding_serial_init,
.get_fd = binding_serial_get_fd,
.process = binding_serial_process,
},
{
.name = "astlpc",
.init = binding_astlpc_init,
.get_fd = binding_astlpc_get_fd,
.process = binding_astlpc_process,
}
};
struct binding *binding_lookup(const char *name)
{
struct binding *binding;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(bindings); i++) {
binding = &bindings[i];
if (!strcmp(binding->name, name))
return binding;
}
return NULL;
}
static int socket_init(struct ctx *ctx)
{
struct sockaddr_un addr;
int namelen, rc;
namelen = sizeof(sockname) - 1;
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, sockname, namelen);
ctx->sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (ctx->sock < 0) {
warn("can't create socket");
return -1;
}
rc = bind(ctx->sock, (struct sockaddr *)&addr,
sizeof(addr.sun_family) + namelen);
if (rc) {
warn("can't bind socket");
goto err_close;
}
rc = listen(ctx->sock, 1);
if (rc) {
warn("can't listen on socket");
goto err_close;
}
return 0;
err_close:
close(ctx->sock);
return -1;
}
static int socket_process(struct ctx *ctx)
{
struct client *client;
int fd;
fd = accept4(ctx->sock, NULL, 0, SOCK_NONBLOCK);
if (fd < 0)
return -1;
ctx->n_clients++;
ctx->clients = realloc(ctx->clients,
ctx->n_clients * sizeof(struct client));
client = &ctx->clients[ctx->n_clients-1];
memset(client, 0, sizeof(*client));
client->active = true;
client->sock = fd;
return 0;
}
static int client_process_recv(struct ctx *ctx, int idx)
{
struct client *client = &ctx->clients[idx];
uint8_t eid;
ssize_t len;
int rc;
/* are we waiting for a type message? */
if (!client->type) {
uint8_t type;
rc = read(client->sock, &type, 1);
if (rc <= 0)
goto out_close;
if (type == 0) {
rc = -1;
goto out_close;
}
if (ctx->verbose)
fprintf(stderr, "client[%d] registered for type %u\n",
idx, type);
client->type = type;
return 0;
}
len = recv(client->sock, NULL, 0, MSG_PEEK | MSG_TRUNC);
if (len < 0) {
if (errno != ECONNRESET)
warn("can't receive (peek) from client");
rc = -1;
goto out_close;
}
if ((size_t)len > ctx->buf_size) {
void *tmp;
tmp = realloc(ctx->buf, len);
if (!tmp) {
warn("can't allocate for incoming message");
rc = -1;
goto out_close;
}
ctx->buf = tmp;
ctx->buf_size = len;
}
rc = recv(client->sock, ctx->buf, ctx->buf_size, 0);
if (rc < 0) {
if (errno != ECONNRESET)
warn("can't receive from client");
rc = -1;
goto out_close;
}
if (rc <= 0) {
rc = -1;
goto out_close;
}
eid = *(uint8_t *)ctx->buf;
if (ctx->verbose)
fprintf(stderr,
"client[%d] sent message: dest 0x%02x len %d\n",
idx, eid, rc - 1);
if (eid == ctx->local_eid)
rx_message(eid, ctx, ctx->buf + 1, rc - 1);
else
tx_message(ctx, eid, ctx->buf + 1, rc - 1);
return 0;
out_close:
client->active = false;
return rc;
}
static int binding_init(struct ctx *ctx, const char *name,
int argc, char * const *argv)
{
int rc;
ctx->binding = binding_lookup(name);
if (!ctx->binding) {
warnx("no such binding '%s'", name);
return -1;
}
rc = ctx->binding->init(ctx->mctp, ctx->binding, ctx->local_eid,
argc, argv);
return rc;
}
enum {
FD_BINDING = 0,
FD_SOCKET,
FD_NR,
};
static int run_daemon(struct ctx *ctx)
{
bool clients_changed = false;
int rc, i;
ctx->pollfds = malloc(FD_NR * sizeof(struct pollfd));
if (ctx->binding->get_fd) {
ctx->pollfds[FD_BINDING].fd =
ctx->binding->get_fd(ctx->binding);
ctx->pollfds[FD_BINDING].events = POLLIN;
} else {
ctx->pollfds[FD_BINDING].fd = -1;
ctx->pollfds[FD_BINDING].events = 0;
}
ctx->pollfds[FD_SOCKET].fd = ctx->sock;
ctx->pollfds[FD_SOCKET].events = POLLIN;
mctp_set_rx_all(ctx->mctp, rx_message, ctx);
for (;;) {
if (clients_changed) {
int i;
ctx->pollfds = realloc(ctx->pollfds,
(ctx->n_clients + FD_NR) *
sizeof(struct pollfd));
for (i = 0; i < ctx->n_clients; i++) {
ctx->pollfds[FD_NR+i].fd =
ctx->clients[i].sock;
ctx->pollfds[FD_NR+i].events = POLLIN;
}
clients_changed = false;
}
rc = poll(ctx->pollfds, ctx->n_clients + FD_NR, -1);
if (rc < 0) {
warn("poll failed");
break;
}
if (!rc)
continue;
if (ctx->pollfds[FD_BINDING].revents) {
rc = 0;
if (ctx->binding->process)
rc = ctx->binding->process(ctx->binding);
if (rc)
break;
}
for (i = 0; i < ctx->n_clients; i++) {
if (!ctx->pollfds[FD_NR+i].revents)
continue;
rc = client_process_recv(ctx, i);
if (rc)
clients_changed = true;
}
if (ctx->pollfds[FD_SOCKET].revents) {
rc = socket_process(ctx);
if (rc)
break;
clients_changed = true;
}
if (clients_changed)
client_remove_inactive(ctx);
}
free(ctx->pollfds);
return rc;
}
static const struct option options[] = {
{ "verbose", no_argument, 0, 'v' },
{ "eid", required_argument, 0, 'e' },
{ 0 },
};
static void usage(const char *progname)
{
unsigned int i;
fprintf(stderr, "usage: %s <binding> [params]\n", progname);
fprintf(stderr, "Available bindings:\n");
for (i = 0; i < ARRAY_SIZE(bindings); i++)
fprintf(stderr, " %s\n", bindings[i].name);
}
int main(int argc, char * const *argv)
{
struct ctx *ctx, _ctx;
int rc;
ctx = &_ctx;
ctx->clients = NULL;
ctx->n_clients = 0;
ctx->local_eid = local_eid_default;
ctx->verbose = false;
for (;;) {
rc = getopt_long(argc, argv, "e:v", options, NULL);
if (rc == -1)
break;
switch (rc) {
case 'v':
ctx->verbose = true;
break;
case 'e':
ctx->local_eid = atoi(optarg);
break;
default:
fprintf(stderr, "Invalid argument\n");
return EXIT_FAILURE;
}
}
if (optind >= argc) {
fprintf(stderr, "missing binding argument\n");
usage(argv[0]);
return EXIT_FAILURE;
}
/* setup initial buffer */
ctx->buf_size = 4096;
ctx->buf = malloc(ctx->buf_size);
mctp_set_log_stdio(ctx->verbose ? MCTP_LOG_DEBUG : MCTP_LOG_WARNING);
ctx->mctp = mctp_init();
assert(ctx->mctp);
rc = binding_init(ctx, argv[optind], argc - optind - 1, argv + optind + 1);
if (rc)
return EXIT_FAILURE;
rc = socket_init(ctx);
if (rc)
return EXIT_FAILURE;
rc = run_daemon(ctx);
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}