| Current Path : /usr/src/sbin/ggate/ggated/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sbin/ggate/ggated/ggated.c |
/*-
* 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: release/9.1.0/sbin/ggate/ggated/ggated.c 204075 2010-02-18 23:04:01Z pjd $
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/disk.h>
#include <sys/bio.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <signal.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <libgen.h>
#include <syslog.h>
#include <stdarg.h>
#include "ggate.h"
#define GGATED_EXPORT_FILE "/etc/gg.exports"
struct ggd_connection {
off_t c_mediasize;
unsigned c_sectorsize;
unsigned c_flags; /* flags (RO/RW) */
int c_diskfd;
int c_sendfd;
int c_recvfd;
time_t c_birthtime;
char *c_path;
uint64_t c_token;
in_addr_t c_srcip;
LIST_ENTRY(ggd_connection) c_next;
};
struct ggd_request {
struct g_gate_hdr r_hdr;
char *r_data;
TAILQ_ENTRY(ggd_request) r_next;
};
#define r_cmd r_hdr.gh_cmd
#define r_offset r_hdr.gh_offset
#define r_length r_hdr.gh_length
#define r_error r_hdr.gh_error
struct ggd_export {
char *e_path; /* path to device/file */
in_addr_t e_ip; /* remote IP address */
in_addr_t e_mask; /* IP mask */
unsigned e_flags; /* flags (RO/RW) */
SLIST_ENTRY(ggd_export) e_next;
};
static const char *exports_file = GGATED_EXPORT_FILE;
static int got_sighup = 0;
in_addr_t bindaddr;
static TAILQ_HEAD(, ggd_request) inqueue = TAILQ_HEAD_INITIALIZER(inqueue);
static TAILQ_HEAD(, ggd_request) outqueue = TAILQ_HEAD_INITIALIZER(outqueue);
pthread_mutex_t inqueue_mtx, outqueue_mtx;
pthread_cond_t inqueue_cond, outqueue_cond;
static SLIST_HEAD(, ggd_export) exports = SLIST_HEAD_INITIALIZER(exports);
static LIST_HEAD(, ggd_connection) connections = LIST_HEAD_INITIALIZER(connections);
static void *recv_thread(void *arg);
static void *disk_thread(void *arg);
static void *send_thread(void *arg);
static void
usage(void)
{
fprintf(stderr, "usage: %s [-nv] [-a address] [-p port] [-R rcvbuf] "
"[-S sndbuf] [exports file]\n", getprogname());
exit(EXIT_FAILURE);
}
static char *
ip2str(in_addr_t ip)
{
static char sip[16];
snprintf(sip, sizeof(sip), "%u.%u.%u.%u",
((ip >> 24) & 0xff),
((ip >> 16) & 0xff),
((ip >> 8) & 0xff),
(ip & 0xff));
return (sip);
}
static in_addr_t
countmask(unsigned m)
{
in_addr_t mask;
if (m == 0) {
mask = 0x0;
} else {
mask = 1 << (32 - m);
mask--;
mask = ~mask;
}
return (mask);
}
static void
line_parse(char *line, unsigned lineno)
{
struct ggd_export *ex;
char *word, *path, *sflags;
unsigned flags, i, vmask;
in_addr_t ip, mask;
ip = mask = flags = vmask = 0;
path = NULL;
sflags = NULL;
for (i = 0, word = strtok(line, " \t"); word != NULL;
i++, word = strtok(NULL, " \t")) {
switch (i) {
case 0: /* IP address or host name */
ip = g_gate_str2ip(strsep(&word, "/"));
if (ip == INADDR_NONE) {
g_gate_xlog("Invalid IP/host name at line %u.",
lineno);
}
ip = ntohl(ip);
if (word == NULL)
vmask = 32;
else {
errno = 0;
vmask = strtoul(word, NULL, 10);
if (vmask == 0 && errno != 0) {
g_gate_xlog("Invalid IP mask value at "
"line %u.", lineno);
}
if ((unsigned)vmask > 32) {
g_gate_xlog("Invalid IP mask value at line %u.",
lineno);
}
}
mask = countmask(vmask);
break;
case 1: /* flags */
if (strcasecmp("rd", word) == 0 ||
strcasecmp("ro", word) == 0) {
flags = O_RDONLY;
} else if (strcasecmp("wo", word) == 0) {
flags = O_WRONLY;
} else if (strcasecmp("rw", word) == 0) {
flags = O_RDWR;
} else {
g_gate_xlog("Invalid value in flags field at "
"line %u.", lineno);
}
sflags = word;
break;
case 2: /* path */
if (strlen(word) >= MAXPATHLEN) {
g_gate_xlog("Path too long at line %u. ",
lineno);
}
path = word;
break;
default:
g_gate_xlog("Too many arguments at line %u. ", lineno);
}
}
if (i != 3)
g_gate_xlog("Too few arguments at line %u.", lineno);
ex = malloc(sizeof(*ex));
if (ex == NULL)
g_gate_xlog("Not enough memory.");
ex->e_path = strdup(path);
if (ex->e_path == NULL)
g_gate_xlog("Not enough memory.");
/* Made 'and' here. */
ex->e_ip = (ip & mask);
ex->e_mask = mask;
ex->e_flags = flags;
SLIST_INSERT_HEAD(&exports, ex, e_next);
g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.",
ip2str(ex->e_ip), vmask, path, sflags);
}
static void
exports_clear(void)
{
struct ggd_export *ex;
while (!SLIST_EMPTY(&exports)) {
ex = SLIST_FIRST(&exports);
SLIST_REMOVE_HEAD(&exports, e_next);
free(ex);
}
}
#define EXPORTS_LINE_SIZE 2048
static void
exports_get(void)
{
char buf[EXPORTS_LINE_SIZE], *line;
unsigned lineno = 0, objs = 0, len;
FILE *fd;
exports_clear();
fd = fopen(exports_file, "r");
if (fd == NULL) {
g_gate_xlog("Cannot open exports file (%s): %s.", exports_file,
strerror(errno));
}
g_gate_log(LOG_INFO, "Reading exports file (%s).", exports_file);
for (;;) {
if (fgets(buf, sizeof(buf), fd) == NULL) {
if (feof(fd))
break;
g_gate_xlog("Error while reading exports file: %s.",
strerror(errno));
}
/* Increase line count. */
lineno++;
/* Skip spaces and tabs. */
for (line = buf; *line == ' ' || *line == '\t'; ++line)
;
/* Empty line, comment or empty line at the end of file. */
if (*line == '\n' || *line == '#' || *line == '\0')
continue;
len = strlen(line);
if (line[len - 1] == '\n') {
/* Remove new line char. */
line[len - 1] = '\0';
} else {
if (!feof(fd))
g_gate_xlog("Line %u too long.", lineno);
}
line_parse(line, lineno);
objs++;
}
fclose(fd);
if (objs == 0)
g_gate_xlog("There are no objects to export.");
g_gate_log(LOG_INFO, "Exporting %u object(s).", objs);
}
static int
exports_check(struct ggd_export *ex, struct g_gate_cinit *cinit,
struct ggd_connection *conn)
{
char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */
int error = 0, flags;
strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask));
strlcat(ipmask, "/", sizeof(ipmask));
strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask));
if ((cinit->gc_flags & GGATE_FLAG_RDONLY) != 0) {
if (ex->e_flags == O_WRONLY) {
g_gate_log(LOG_WARNING, "Read-only access requested, "
"but %s (%s) is exported write-only.", ex->e_path,
ipmask);
return (EPERM);
} else {
conn->c_flags |= GGATE_FLAG_RDONLY;
}
} else if ((cinit->gc_flags & GGATE_FLAG_WRONLY) != 0) {
if (ex->e_flags == O_RDONLY) {
g_gate_log(LOG_WARNING, "Write-only access requested, "
"but %s (%s) is exported read-only.", ex->e_path,
ipmask);
return (EPERM);
} else {
conn->c_flags |= GGATE_FLAG_WRONLY;
}
} else {
if (ex->e_flags == O_RDONLY) {
g_gate_log(LOG_WARNING, "Read-write access requested, "
"but %s (%s) is exported read-only.", ex->e_path,
ipmask);
return (EPERM);
} else if (ex->e_flags == O_WRONLY) {
g_gate_log(LOG_WARNING, "Read-write access requested, "
"but %s (%s) is exported write-only.", ex->e_path,
ipmask);
return (EPERM);
}
}
if ((conn->c_flags & GGATE_FLAG_RDONLY) != 0)
flags = O_RDONLY;
else if ((conn->c_flags & GGATE_FLAG_WRONLY) != 0)
flags = O_WRONLY;
else
flags = O_RDWR;
conn->c_diskfd = open(ex->e_path, flags);
if (conn->c_diskfd == -1) {
error = errno;
g_gate_log(LOG_ERR, "Cannot open %s: %s.", ex->e_path,
strerror(error));
return (error);
}
return (0);
}
static struct ggd_export *
exports_find(struct sockaddr *s, struct g_gate_cinit *cinit,
struct ggd_connection *conn)
{
struct ggd_export *ex;
in_addr_t ip;
int error;
ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
SLIST_FOREACH(ex, &exports, e_next) {
if ((ip & ex->e_mask) != ex->e_ip) {
g_gate_log(LOG_DEBUG, "exports[%s]: IP mismatch.",
ex->e_path);
continue;
}
if (strcmp(cinit->gc_path, ex->e_path) != 0) {
g_gate_log(LOG_DEBUG, "exports[%s]: Path mismatch.",
ex->e_path);
continue;
}
error = exports_check(ex, cinit, conn);
if (error == 0)
return (ex);
else {
errno = error;
return (NULL);
}
}
g_gate_log(LOG_WARNING, "Unauthorized connection from: %s.",
ip2str(ip));
errno = EPERM;
return (NULL);
}
/*
* Remove timed out connections.
*/
static void
connection_cleanups(void)
{
struct ggd_connection *conn, *tconn;
time_t now;
time(&now);
LIST_FOREACH_SAFE(conn, &connections, c_next, tconn) {
if (now - conn->c_birthtime > 10) {
LIST_REMOVE(conn, c_next);
g_gate_log(LOG_NOTICE,
"Connection from %s [%s] removed.",
ip2str(conn->c_srcip), conn->c_path);
close(conn->c_diskfd);
close(conn->c_sendfd);
close(conn->c_recvfd);
free(conn->c_path);
free(conn);
}
}
}
static struct ggd_connection *
connection_find(struct g_gate_cinit *cinit)
{
struct ggd_connection *conn;
LIST_FOREACH(conn, &connections, c_next) {
if (conn->c_token == cinit->gc_token)
break;
}
return (conn);
}
static struct ggd_connection *
connection_new(struct g_gate_cinit *cinit, struct sockaddr *s, int sfd)
{
struct ggd_connection *conn;
in_addr_t ip;
/*
* First, look for old connections.
* We probably should do it every X seconds, but what for?
* It is only dangerous if an attacker wants to overload connections
* queue, so here is a good place to do the cleanups.
*/
connection_cleanups();
conn = malloc(sizeof(*conn));
if (conn == NULL)
return (NULL);
conn->c_path = strdup(cinit->gc_path);
if (conn->c_path == NULL) {
free(conn);
return (NULL);
}
conn->c_token = cinit->gc_token;
ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
conn->c_srcip = ip;
conn->c_sendfd = conn->c_recvfd = -1;
if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0)
conn->c_sendfd = sfd;
else
conn->c_recvfd = sfd;
conn->c_mediasize = 0;
conn->c_sectorsize = 0;
time(&conn->c_birthtime);
conn->c_flags = cinit->gc_flags;
LIST_INSERT_HEAD(&connections, conn, c_next);
g_gate_log(LOG_DEBUG, "Connection created [%s, %s].", ip2str(ip),
conn->c_path);
return (conn);
}
static int
connection_add(struct ggd_connection *conn, struct g_gate_cinit *cinit,
struct sockaddr *s, int sfd)
{
in_addr_t ip;
ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) {
if (conn->c_sendfd != -1) {
g_gate_log(LOG_WARNING,
"Send socket already exists [%s, %s].", ip2str(ip),
conn->c_path);
return (EEXIST);
}
conn->c_sendfd = sfd;
} else {
if (conn->c_recvfd != -1) {
g_gate_log(LOG_WARNING,
"Receive socket already exists [%s, %s].",
ip2str(ip), conn->c_path);
return (EEXIST);
}
conn->c_recvfd = sfd;
}
g_gate_log(LOG_DEBUG, "Connection added [%s, %s].", ip2str(ip),
conn->c_path);
return (0);
}
/*
* Remove one socket from the given connection or the whole
* connection if sfd == -1.
*/
static void
connection_remove(struct ggd_connection *conn)
{
LIST_REMOVE(conn, c_next);
g_gate_log(LOG_DEBUG, "Connection removed [%s %s].",
ip2str(conn->c_srcip), conn->c_path);
if (conn->c_sendfd != -1)
close(conn->c_sendfd);
if (conn->c_recvfd != -1)
close(conn->c_recvfd);
free(conn->c_path);
free(conn);
}
static int
connection_ready(struct ggd_connection *conn)
{
return (conn->c_sendfd != -1 && conn->c_recvfd != -1);
}
static void
connection_launch(struct ggd_connection *conn)
{
pthread_t td;
int error, pid;
pid = fork();
if (pid > 0)
return;
else if (pid == -1) {
g_gate_log(LOG_ERR, "Cannot fork: %s.", strerror(errno));
return;
}
g_gate_log(LOG_DEBUG, "Process created [%s].", conn->c_path);
/*
* Create condition variables and mutexes for in-queue and out-queue
* synchronization.
*/
error = pthread_mutex_init(&inqueue_mtx, NULL);
if (error != 0) {
g_gate_xlog("pthread_mutex_init(inqueue_mtx): %s.",
strerror(error));
}
error = pthread_cond_init(&inqueue_cond, NULL);
if (error != 0) {
g_gate_xlog("pthread_cond_init(inqueue_cond): %s.",
strerror(error));
}
error = pthread_mutex_init(&outqueue_mtx, NULL);
if (error != 0) {
g_gate_xlog("pthread_mutex_init(outqueue_mtx): %s.",
strerror(error));
}
error = pthread_cond_init(&outqueue_cond, NULL);
if (error != 0) {
g_gate_xlog("pthread_cond_init(outqueue_cond): %s.",
strerror(error));
}
/*
* Create threads:
* recvtd - thread for receiving I/O request
* diskio - thread for doing I/O request
* sendtd - thread for sending I/O requests back
*/
error = pthread_create(&td, NULL, send_thread, conn);
if (error != 0) {
g_gate_xlog("pthread_create(send_thread): %s.",
strerror(error));
}
error = pthread_create(&td, NULL, recv_thread, conn);
if (error != 0) {
g_gate_xlog("pthread_create(recv_thread): %s.",
strerror(error));
}
disk_thread(conn);
}
static void
sendfail(int sfd, int error, const char *fmt, ...)
{
struct g_gate_sinit sinit;
va_list ap;
ssize_t data;
sinit.gs_error = error;
g_gate_swap2n_sinit(&sinit);
data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
g_gate_swap2h_sinit(&sinit);
if (data != sizeof(sinit)) {
g_gate_log(LOG_WARNING, "Cannot send initial packet: %s.",
strerror(errno));
return;
}
if (fmt != NULL) {
va_start(ap, fmt);
g_gate_vlog(LOG_WARNING, fmt, ap);
va_end(ap);
}
}
static void *
malloc_waitok(size_t size)
{
void *p;
while ((p = malloc(size)) == NULL) {
g_gate_log(LOG_DEBUG, "Cannot allocate %zu bytes.", size);
sleep(1);
}
return (p);
}
static void *
recv_thread(void *arg)
{
struct ggd_connection *conn;
struct ggd_request *req;
ssize_t data;
int error, fd;
conn = arg;
g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
fd = conn->c_recvfd;
for (;;) {
/*
* Get header packet.
*/
req = malloc_waitok(sizeof(*req));
data = g_gate_recv(fd, &req->r_hdr, sizeof(req->r_hdr),
MSG_WAITALL);
if (data == 0) {
g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid());
exit(EXIT_SUCCESS);
} else if (data == -1) {
g_gate_xlog("Error while receiving hdr packet: %s.",
strerror(errno));
} else if (data != sizeof(req->r_hdr)) {
g_gate_xlog("Malformed hdr packet received.");
}
g_gate_log(LOG_DEBUG, "Received hdr packet.");
g_gate_swap2h_hdr(&req->r_hdr);
g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
(intmax_t)req->r_offset, (unsigned)req->r_length);
/*
* Allocate memory for data.
*/
req->r_data = malloc_waitok(req->r_length);
/*
* Receive data to write for WRITE request.
*/
if (req->r_cmd == GGATE_CMD_WRITE) {
g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...",
req->r_length);
data = g_gate_recv(fd, req->r_data, req->r_length,
MSG_WAITALL);
if (data == -1) {
g_gate_xlog("Error while receiving data: %s.",
strerror(errno));
}
}
/*
* Put the request onto the incoming queue.
*/
error = pthread_mutex_lock(&inqueue_mtx);
assert(error == 0);
TAILQ_INSERT_TAIL(&inqueue, req, r_next);
error = pthread_cond_signal(&inqueue_cond);
assert(error == 0);
error = pthread_mutex_unlock(&inqueue_mtx);
assert(error == 0);
}
}
static void *
disk_thread(void *arg)
{
struct ggd_connection *conn;
struct ggd_request *req;
ssize_t data;
int error, fd;
conn = arg;
g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
fd = conn->c_diskfd;
for (;;) {
/*
* Get a request from the incoming queue.
*/
error = pthread_mutex_lock(&inqueue_mtx);
assert(error == 0);
while ((req = TAILQ_FIRST(&inqueue)) == NULL) {
error = pthread_cond_wait(&inqueue_cond, &inqueue_mtx);
assert(error == 0);
}
TAILQ_REMOVE(&inqueue, req, r_next);
error = pthread_mutex_unlock(&inqueue_mtx);
assert(error == 0);
/*
* Check the request.
*/
assert(req->r_cmd == GGATE_CMD_READ || req->r_cmd == GGATE_CMD_WRITE);
assert(req->r_offset + req->r_length <= (uintmax_t)conn->c_mediasize);
assert((req->r_offset % conn->c_sectorsize) == 0);
assert((req->r_length % conn->c_sectorsize) == 0);
g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
(intmax_t)req->r_offset, (unsigned)req->r_length);
/*
* Do the request.
*/
data = 0;
switch (req->r_cmd) {
case GGATE_CMD_READ:
data = pread(fd, req->r_data, req->r_length,
req->r_offset);
break;
case GGATE_CMD_WRITE:
data = pwrite(fd, req->r_data, req->r_length,
req->r_offset);
/* Free data memory here - better sooner. */
free(req->r_data);
req->r_data = NULL;
break;
}
if (data != (ssize_t)req->r_length) {
/* Report short reads/writes as I/O errors. */
if (errno == 0)
errno = EIO;
g_gate_log(LOG_ERR, "Disk error: %s", strerror(errno));
req->r_error = errno;
if (req->r_data != NULL) {
free(req->r_data);
req->r_data = NULL;
}
}
/*
* Put the request onto the outgoing queue.
*/
error = pthread_mutex_lock(&outqueue_mtx);
assert(error == 0);
TAILQ_INSERT_TAIL(&outqueue, req, r_next);
error = pthread_cond_signal(&outqueue_cond);
assert(error == 0);
error = pthread_mutex_unlock(&outqueue_mtx);
assert(error == 0);
}
/* NOTREACHED */
return (NULL);
}
static void *
send_thread(void *arg)
{
struct ggd_connection *conn;
struct ggd_request *req;
ssize_t data;
int error, fd;
conn = arg;
g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
fd = conn->c_sendfd;
for (;;) {
/*
* Get a request from the outgoing queue.
*/
error = pthread_mutex_lock(&outqueue_mtx);
assert(error == 0);
while ((req = TAILQ_FIRST(&outqueue)) == NULL) {
error = pthread_cond_wait(&outqueue_cond,
&outqueue_mtx);
assert(error == 0);
}
TAILQ_REMOVE(&outqueue, req, r_next);
error = pthread_mutex_unlock(&outqueue_mtx);
assert(error == 0);
g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
(intmax_t)req->r_offset, (unsigned)req->r_length);
/*
* Send the request.
*/
g_gate_swap2n_hdr(&req->r_hdr);
if (g_gate_send(fd, &req->r_hdr, sizeof(req->r_hdr), 0) == -1) {
g_gate_xlog("Error while sending hdr packet: %s.",
strerror(errno));
}
g_gate_log(LOG_DEBUG, "Sent hdr packet.");
g_gate_swap2h_hdr(&req->r_hdr);
if (req->r_data != NULL) {
data = g_gate_send(fd, req->r_data, req->r_length, 0);
if (data != (ssize_t)req->r_length) {
g_gate_xlog("Error while sending data: %s.",
strerror(errno));
}
g_gate_log(LOG_DEBUG,
"Sent %zd bytes (offset=%ju, size=%zu).", data,
(uintmax_t)req->r_offset, (size_t)req->r_length);
free(req->r_data);
}
free(req);
}
/* NOTREACHED */
return (NULL);
}
static void
log_connection(struct sockaddr *from)
{
in_addr_t ip;
ip = htonl(((struct sockaddr_in *)(void *)from)->sin_addr.s_addr);
g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip));
}
static int
handshake(struct sockaddr *from, int sfd)
{
struct g_gate_version ver;
struct g_gate_cinit cinit;
struct g_gate_sinit sinit;
struct ggd_connection *conn;
struct ggd_export *ex;
ssize_t data;
log_connection(from);
/*
* Phase 1: Version verification.
*/
g_gate_log(LOG_DEBUG, "Receiving version packet.");
data = g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL);
g_gate_swap2h_version(&ver);
if (data != sizeof(ver)) {
g_gate_log(LOG_WARNING, "Malformed version packet.");
return (0);
}
g_gate_log(LOG_DEBUG, "Version packet received.");
if (memcmp(ver.gv_magic, GGATE_MAGIC, strlen(GGATE_MAGIC)) != 0) {
g_gate_log(LOG_WARNING, "Invalid magic field.");
return (0);
}
if (ver.gv_version != GGATE_VERSION) {
g_gate_log(LOG_WARNING, "Version %u is not supported.",
ver.gv_version);
return (0);
}
ver.gv_error = 0;
g_gate_swap2n_version(&ver);
data = g_gate_send(sfd, &ver, sizeof(ver), 0);
g_gate_swap2h_version(&ver);
if (data == -1) {
sendfail(sfd, errno, "Error while sending version packet: %s.",
strerror(errno));
return (0);
}
/*
* Phase 2: Request verification.
*/
g_gate_log(LOG_DEBUG, "Receiving initial packet.");
data = g_gate_recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL);
g_gate_swap2h_cinit(&cinit);
if (data != sizeof(cinit)) {
g_gate_log(LOG_WARNING, "Malformed initial packet.");
return (0);
}
g_gate_log(LOG_DEBUG, "Initial packet received.");
conn = connection_find(&cinit);
if (conn != NULL) {
/*
* Connection should already exists.
*/
g_gate_log(LOG_DEBUG, "Found existing connection (token=%lu).",
(unsigned long)conn->c_token);
if (connection_add(conn, &cinit, from, sfd) == -1) {
connection_remove(conn);
return (0);
}
} else {
/*
* New connection, allocate space.
*/
conn = connection_new(&cinit, from, sfd);
if (conn == NULL) {
sendfail(sfd, ENOMEM,
"Cannot allocate new connection.");
return (0);
}
g_gate_log(LOG_DEBUG, "New connection created (token=%lu).",
(unsigned long)conn->c_token);
}
ex = exports_find(from, &cinit, conn);
if (ex == NULL) {
connection_remove(conn);
sendfail(sfd, errno, NULL);
return (0);
}
if (conn->c_mediasize == 0) {
conn->c_mediasize = g_gate_mediasize(conn->c_diskfd);
conn->c_sectorsize = g_gate_sectorsize(conn->c_diskfd);
}
sinit.gs_mediasize = conn->c_mediasize;
sinit.gs_sectorsize = conn->c_sectorsize;
sinit.gs_error = 0;
g_gate_log(LOG_DEBUG, "Sending initial packet.");
g_gate_swap2n_sinit(&sinit);
data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
g_gate_swap2h_sinit(&sinit);
if (data == -1) {
sendfail(sfd, errno, "Error while sending initial packet: %s.",
strerror(errno));
return (0);
}
if (connection_ready(conn)) {
connection_launch(conn);
connection_remove(conn);
}
return (1);
}
static void
huphandler(int sig __unused)
{
got_sighup = 1;
}
int
main(int argc, char *argv[])
{
struct sockaddr_in serv;
struct sockaddr from;
socklen_t fromlen;
int sfd, tmpsfd;
unsigned port;
bindaddr = htonl(INADDR_ANY);
port = G_GATE_PORT;
for (;;) {
int ch;
ch = getopt(argc, argv, "a:hnp:R:S:v");
if (ch == -1)
break;
switch (ch) {
case 'a':
bindaddr = g_gate_str2ip(optarg);
if (bindaddr == INADDR_NONE) {
errx(EXIT_FAILURE,
"Invalid IP/host name to bind to.");
}
break;
case 'n':
nagle = 0;
break;
case 'p':
errno = 0;
port = strtoul(optarg, NULL, 10);
if (port == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid port.");
break;
case 'R':
errno = 0;
rcvbuf = strtoul(optarg, NULL, 10);
if (rcvbuf == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid rcvbuf.");
break;
case 'S':
errno = 0;
sndbuf = strtoul(optarg, NULL, 10);
if (sndbuf == 0 && errno != 0)
errx(EXIT_FAILURE, "Invalid sndbuf.");
break;
case 'v':
g_gate_verbose++;
break;
case 'h':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argv[0] != NULL)
exports_file = argv[0];
exports_get();
if (!g_gate_verbose) {
/* Run in daemon mode. */
if (daemon(0, 0) == -1)
g_gate_xlog("Cannot daemonize: %s", strerror(errno));
}
signal(SIGCHLD, SIG_IGN);
sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd == -1)
g_gate_xlog("Cannot open stream socket: %s.", strerror(errno));
bzero(&serv, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = bindaddr;
serv.sin_port = htons(port);
g_gate_socket_settings(sfd);
if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1)
g_gate_xlog("bind(): %s.", strerror(errno));
if (listen(sfd, 5) == -1)
g_gate_xlog("listen(): %s.", strerror(errno));
g_gate_log(LOG_INFO, "Listen on port: %d.", port);
signal(SIGHUP, huphandler);
for (;;) {
fromlen = sizeof(from);
tmpsfd = accept(sfd, &from, &fromlen);
if (tmpsfd == -1)
g_gate_xlog("accept(): %s.", strerror(errno));
if (got_sighup) {
got_sighup = 0;
exports_get();
}
if (!handshake(&from, tmpsfd))
close(tmpsfd);
}
close(sfd);
exit(EXIT_SUCCESS);
}