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opnsense-src/sbin/ggate/ggatec/ggatec.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <libgen.h>
#include <pthread.h>
#include <signal.h>
#include <err.h>
#include <errno.h>
#include <assert.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/bio.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <geom/gate/g_gate.h>
#include "ggate.h"
static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
static const char *path = NULL;
static const char *host = NULL;
static int unit = G_GATE_UNIT_AUTO;
static unsigned flags = 0;
static int force = 0;
static unsigned queue_size = G_GATE_QUEUE_SIZE;
static unsigned port = G_GATE_PORT;
static off_t mediasize;
static unsigned sectorsize = 0;
static unsigned timeout = G_GATE_TIMEOUT;
static int sendfd, recvfd;
static uint32_t token;
static pthread_t sendtd, recvtd;
static int reconnect;
static void
usage(void)
{
fprintf(stderr, "usage: %s create [-nv] [-o <ro|wo|rw>] [-p port] "
"[-q queue_size] [-R rcvbuf] [-S sndbuf] [-s sectorsize] "
"[-t timeout] [-u unit] <host> <path>\n", getprogname());
fprintf(stderr, " %s rescue [-nv] [-o <ro|wo|rw>] [-p port] "
"[-R rcvbuf] [-S sndbuf] <-u unit> <host> <path>\n", getprogname());
fprintf(stderr, " %s destroy [-f] <-u unit>\n", getprogname());
fprintf(stderr, " %s list [-v] [-u unit]\n", getprogname());
exit(EXIT_FAILURE);
}
static void *
send_thread(void *arg __unused)
{
struct g_gate_ctl_io ggio;
struct g_gate_hdr hdr;
char buf[MAXPHYS];
ssize_t data;
int error;
g_gate_log(LOG_NOTICE, "%s: started!", __func__);
ggio.gctl_version = G_GATE_VERSION;
ggio.gctl_unit = unit;
ggio.gctl_data = buf;
for (;;) {
ggio.gctl_length = sizeof(buf);
ggio.gctl_error = 0;
g_gate_ioctl(G_GATE_CMD_START, &ggio);
error = ggio.gctl_error;
switch (error) {
case 0:
break;
case ECANCELED:
if (reconnect)
break;
/* Exit gracefully. */
g_gate_close_device();
exit(EXIT_SUCCESS);
#if 0
case ENOMEM:
/* Buffer too small. */
ggio.gctl_data = realloc(ggio.gctl_data,
ggio.gctl_length);
if (ggio.gctl_data != NULL) {
bsize = ggio.gctl_length;
goto once_again;
}
/* FALLTHROUGH */
#endif
case ENXIO:
default:
g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME,
strerror(error));
}
if (reconnect)
break;
switch (ggio.gctl_cmd) {
case BIO_READ:
hdr.gh_cmd = GGATE_CMD_READ;
break;
case BIO_WRITE:
hdr.gh_cmd = GGATE_CMD_WRITE;
break;
default:
g_gate_log(LOG_NOTICE, "Unknown gctl_cmd: %i", ggio.gctl_cmd);
ggio.gctl_error = EOPNOTSUPP;
g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
continue;
}
/* Don't send requests for more data than we can handle the response for! */
if (ggio.gctl_length > MAXPHYS) {
g_gate_log(LOG_ERR, "Request too big: %zd", ggio.gctl_length);
ggio.gctl_error = EOPNOTSUPP;
g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
continue;
}
hdr.gh_seq = ggio.gctl_seq;
hdr.gh_offset = ggio.gctl_offset;
hdr.gh_length = ggio.gctl_length;
hdr.gh_error = 0;
g_gate_swap2n_hdr(&hdr);
data = g_gate_send(sendfd, &hdr, sizeof(hdr), MSG_NOSIGNAL);
g_gate_log(LOG_DEBUG, "Sent hdr packet.");
g_gate_swap2h_hdr(&hdr);
if (reconnect)
break;
if (data != sizeof(hdr)) {
g_gate_log(LOG_ERR, "Lost connection 1.");
reconnect = 1;
pthread_kill(recvtd, SIGUSR1);
break;
}
if (hdr.gh_cmd == GGATE_CMD_WRITE) {
data = g_gate_send(sendfd, ggio.gctl_data,
ggio.gctl_length, MSG_NOSIGNAL);
if (reconnect)
break;
if (data != ggio.gctl_length) {
g_gate_log(LOG_ERR, "Lost connection 2 (%zd != %zd).", data, (ssize_t)ggio.gctl_length);
reconnect = 1;
pthread_kill(recvtd, SIGUSR1);
break;
}
g_gate_log(LOG_DEBUG, "Sent %zd bytes (offset=%llu, "
"size=%u).", data, hdr.gh_offset, hdr.gh_length);
}
}
g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
return (NULL);
}
static void *
recv_thread(void *arg __unused)
{
struct g_gate_ctl_io ggio;
struct g_gate_hdr hdr;
char buf[MAXPHYS];
ssize_t data;
g_gate_log(LOG_NOTICE, "%s: started!", __func__);
ggio.gctl_version = G_GATE_VERSION;
ggio.gctl_unit = unit;
ggio.gctl_data = buf;
for (;;) {
data = g_gate_recv(recvfd, &hdr, sizeof(hdr), MSG_WAITALL);
if (reconnect)
break;
g_gate_swap2h_hdr(&hdr);
if (data != sizeof(hdr)) {
if (data == -1 && errno == EAGAIN)
continue;
g_gate_log(LOG_ERR, "Lost connection 3.");
reconnect = 1;
pthread_kill(sendtd, SIGUSR1);
break;
}
g_gate_log(LOG_DEBUG, "Received hdr packet.");
ggio.gctl_seq = hdr.gh_seq;
ggio.gctl_cmd = hdr.gh_cmd;
ggio.gctl_offset = hdr.gh_offset;
ggio.gctl_length = hdr.gh_length;
ggio.gctl_error = hdr.gh_error;
/* Do not overflow our buffer if there is a bogus response. */
if (ggio.gctl_length > (off_t) sizeof(buf)) {
g_gate_log(LOG_ERR, "Received too big response: %zd", ggio.gctl_length);
break;
}
if (ggio.gctl_error == 0 && ggio.gctl_cmd == GGATE_CMD_READ) {
data = g_gate_recv(recvfd, ggio.gctl_data,
ggio.gctl_length, MSG_WAITALL);
if (reconnect)
break;
g_gate_log(LOG_DEBUG, "Received data packet.");
if (data != ggio.gctl_length) {
g_gate_log(LOG_ERR, "Lost connection 4.");
reconnect = 1;
pthread_kill(sendtd, SIGUSR1);
break;
}
g_gate_log(LOG_DEBUG, "Received %d bytes (offset=%ju, "
"size=%zu).", data, (uintmax_t)hdr.gh_offset,
(size_t)hdr.gh_length);
}
g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
}
g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
pthread_exit(NULL);
}
static int
handshake(int dir)
{
struct g_gate_version ver;
struct g_gate_cinit cinit;
struct g_gate_sinit sinit;
struct sockaddr_in serv;
int sfd;
/*
* Do the network stuff.
*/
bzero(&serv, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = g_gate_str2ip(host);
if (serv.sin_addr.s_addr == INADDR_NONE) {
g_gate_log(LOG_DEBUG, "Invalid IP/host name: %s.", host);
return (-1);
}
serv.sin_port = htons(port);
sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd == -1) {
g_gate_log(LOG_DEBUG, "Cannot open socket: %s.",
strerror(errno));
return (-1);
}
g_gate_socket_settings(sfd);
if (connect(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1) {
g_gate_log(LOG_DEBUG, "Cannot connect to server: %s.",
strerror(errno));
close(sfd);
return (-1);
}
g_gate_log(LOG_INFO, "Connected to the server: %s:%d.", host, port);
/*
* Create and send version packet.
*/
g_gate_log(LOG_DEBUG, "Sending version packet.");
assert(strlen(GGATE_MAGIC) == sizeof(ver.gv_magic));
bcopy(GGATE_MAGIC, ver.gv_magic, sizeof(ver.gv_magic));
ver.gv_version = GGATE_VERSION;
ver.gv_error = 0;
g_gate_swap2n_version(&ver);
if (g_gate_send(sfd, &ver, sizeof(ver), MSG_NOSIGNAL) == -1) {
g_gate_log(LOG_DEBUG, "Error while sending version packet: %s.",
strerror(errno));
close(sfd);
return (-1);
}
bzero(&ver, sizeof(ver));
if (g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL) == -1) {
g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
strerror(errno));
close(sfd);
return (-1);
}
if (ver.gv_error != 0) {
g_gate_log(LOG_DEBUG, "Version verification problem: %s.",
strerror(errno));
close(sfd);
return (-1);
}
/*
* Create and send initial packet.
*/
g_gate_log(LOG_DEBUG, "Sending initial packet.");
if (strlcpy(cinit.gc_path, path, sizeof(cinit.gc_path)) >=
sizeof(cinit.gc_path)) {
g_gate_log(LOG_DEBUG, "Path name too long.");
close(sfd);
return (-1);
}
cinit.gc_flags = flags | dir;
cinit.gc_token = token;
cinit.gc_nconn = 2;
g_gate_swap2n_cinit(&cinit);
if (g_gate_send(sfd, &cinit, sizeof(cinit), MSG_NOSIGNAL) == -1) {
g_gate_log(LOG_DEBUG, "Error while sending initial packet: %s.",
strerror(errno));
close(sfd);
return (-1);
}
g_gate_swap2h_cinit(&cinit);
/*
* Receiving initial packet from server.
*/
g_gate_log(LOG_DEBUG, "Receiving initial packet.");
if (g_gate_recv(sfd, &sinit, sizeof(sinit), MSG_WAITALL) == -1) {
g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
strerror(errno));
close(sfd);
return (-1);
}
g_gate_swap2h_sinit(&sinit);
if (sinit.gs_error != 0) {
g_gate_log(LOG_DEBUG, "Error from server: %s.",
strerror(sinit.gs_error));
close(sfd);
return (-1);
}
g_gate_log(LOG_DEBUG, "Received initial packet.");
mediasize = sinit.gs_mediasize;
if (sectorsize == 0)
sectorsize = sinit.gs_sectorsize;
return (sfd);
}
static void
mydaemon(void)
{
if (g_gate_verbose > 0)
return;
if (daemon(0, 0) == 0)
return;
if (action == CREATE)
g_gate_destroy(unit, 1);
err(EXIT_FAILURE, "Cannot daemonize");
}
static int
g_gatec_connect(void)
{
token = arc4random();
/*
* Our receive descriptor is connected to the send descriptor on the
* server side.
*/
recvfd = handshake(GGATE_FLAG_SEND);
if (recvfd == -1)
return (0);
/*
* Our send descriptor is connected to the receive descriptor on the
* server side.
*/
sendfd = handshake(GGATE_FLAG_RECV);
if (sendfd == -1)
return (0);
return (1);
}
static void
g_gatec_start(void)
{
int error;
reconnect = 0;
error = pthread_create(&recvtd, NULL, recv_thread, NULL);
if (error != 0) {
g_gate_destroy(unit, 1);
g_gate_xlog("pthread_create(recv_thread): %s.",
strerror(error));
}
sendtd = pthread_self();
send_thread(NULL);
/* Disconnected. */
close(sendfd);
close(recvfd);
}
static void
signop(int sig __unused)
{
/* Do nothing. */
}
static void
g_gatec_loop(void)
{
struct g_gate_ctl_cancel ggioc;
signal(SIGUSR1, signop);
for (;;) {
g_gatec_start();
g_gate_log(LOG_NOTICE, "Disconnected [%s %s]. Connecting...",
host, path);
while (!g_gatec_connect()) {
sleep(2);
g_gate_log(LOG_NOTICE, "Connecting [%s %s]...", host,
path);
}
ggioc.gctl_version = G_GATE_VERSION;
ggioc.gctl_unit = unit;
ggioc.gctl_seq = 0;
g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
}
}
static void
g_gatec_create(void)
{
struct g_gate_ctl_create ggioc;
if (!g_gatec_connect())
g_gate_xlog("Cannot connect: %s.", strerror(errno));
/*
* Ok, got both sockets, time to create provider.
*/
memset(&ggioc, 0, sizeof(ggioc));
ggioc.gctl_version = G_GATE_VERSION;
ggioc.gctl_mediasize = mediasize;
ggioc.gctl_sectorsize = sectorsize;
ggioc.gctl_flags = flags;
ggioc.gctl_maxcount = queue_size;
ggioc.gctl_timeout = timeout;
ggioc.gctl_unit = unit;
snprintf(ggioc.gctl_info, sizeof(ggioc.gctl_info), "%s:%u %s", host,
port, path);
g_gate_ioctl(G_GATE_CMD_CREATE, &ggioc);
if (unit == -1) {
printf("%s%u\n", G_GATE_PROVIDER_NAME, ggioc.gctl_unit);
fflush(stdout);
}
unit = ggioc.gctl_unit;
mydaemon();
g_gatec_loop();
}
static void
g_gatec_rescue(void)
{
struct g_gate_ctl_cancel ggioc;
if (!g_gatec_connect())
g_gate_xlog("Cannot connect: %s.", strerror(errno));
ggioc.gctl_version = G_GATE_VERSION;
ggioc.gctl_unit = unit;
ggioc.gctl_seq = 0;
g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
mydaemon();
g_gatec_loop();
}
int
main(int argc, char *argv[])
{
if (argc < 2)
usage();
if (strcasecmp(argv[1], "create") == 0)
action = CREATE;
else if (strcasecmp(argv[1], "destroy") == 0)
action = DESTROY;
else if (strcasecmp(argv[1], "list") == 0)
action = LIST;
else if (strcasecmp(argv[1], "rescue") == 0)
action = RESCUE;
else
usage();
argc -= 1;
argv += 1;
for (;;) {
int ch;
ch = getopt(argc, argv, "fno:p:q:R:S:s:t:u:v");
if (ch == -1)
break;
switch (ch) {
case 'f':
if (action != DESTROY)
usage();
force = 1;
break;
case 'n':
if (action != CREATE && action != RESCUE)
usage();
nagle = 0;
break;
case 'o':
if (action != CREATE && action != RESCUE)
usage();
if (strcasecmp("ro", optarg) == 0)
flags = G_GATE_FLAG_READONLY;
else if (strcasecmp("wo", optarg) == 0)
flags = G_GATE_FLAG_WRITEONLY;
else if (strcasecmp("rw", optarg) == 0)
flags = 0;
else {
errx(EXIT_FAILURE,
"Invalid argument for '-o' option.");
}
break;
case 'p':
if (action != CREATE && action != RESCUE)
usage();
errno = 0;
port = strtoul(optarg, NULL, 10);
if (port == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid port.");
break;
case 'q':
if (action != CREATE)
usage();
errno = 0;
queue_size = strtoul(optarg, NULL, 10);
if (queue_size == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid queue_size.");
break;
case 'R':
if (action != CREATE && action != RESCUE)
usage();
errno = 0;
rcvbuf = strtoul(optarg, NULL, 10);
if (rcvbuf == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid rcvbuf.");
break;
case 'S':
if (action != CREATE && action != RESCUE)
usage();
errno = 0;
sndbuf = strtoul(optarg, NULL, 10);
if (sndbuf == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid sndbuf.");
break;
case 's':
if (action != CREATE)
usage();
errno = 0;
sectorsize = strtoul(optarg, NULL, 10);
if (sectorsize == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid sectorsize.");
break;
case 't':
if (action != CREATE)
usage();
errno = 0;
timeout = strtoul(optarg, NULL, 10);
if (timeout == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid timeout.");
break;
case 'u':
errno = 0;
unit = strtol(optarg, NULL, 10);
if (unit == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid unit number.");
break;
case 'v':
if (action == DESTROY)
usage();
g_gate_verbose++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
switch (action) {
case CREATE:
if (argc != 2)
usage();
g_gate_load_module();
g_gate_open_device();
host = argv[0];
path = argv[1];
g_gatec_create();
break;
case DESTROY:
if (unit == -1) {
fprintf(stderr, "Required unit number.\n");
usage();
}
g_gate_verbose = 1;
g_gate_open_device();
g_gate_destroy(unit, force);
break;
case LIST:
g_gate_list(unit, g_gate_verbose);
break;
case RESCUE:
if (argc != 2)
usage();
if (unit == -1) {
fprintf(stderr, "Required unit number.\n");
usage();
}
g_gate_open_device();
host = argv[0];
path = argv[1];
g_gatec_rescue();
break;
case UNSET:
default:
usage();
}
g_gate_close_device();
exit(EXIT_SUCCESS);
}
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