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diff --git a/src/transport.c b/src/transport.c
index a5db336..37ccb50 100644
--- a/src/transport.c
+++ b/src/transport.c
@@ -1,627 +1,633 @@
/*
* Copyright (C) 2011 Jiaju Zhang <jjzhang@suse.de>
* Copyright (C) 2013 Philipp Marek <philipp.marek@linbit.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdlib.h>
#include <net/if.h>
#include <asm/types.h>
#include <linux/rtnetlink.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <poll.h>
#include "list.h"
#include "booth.h"
#include "log.h"
#include "config.h"
#include "paxos_lease.h"
#include "transport.h"
#define BOOTH_IPADDR_LEN (sizeof(struct in6_addr))
#define NETLINK_BUFSIZE 16384
#define SOCKET_BUFFER_SIZE 160000
#define FRAME_SIZE_MAX 10000
extern struct client *client;
extern struct pollfd *pollfd;
struct booth_node *local = NULL;
struct tcp_conn {
int s;
struct sockaddr to;
struct list_head list;
};
static LIST_HEAD(tcp);
struct udp_context {
int s;
struct iovec iov_recv;
char iov_buffer[FRAME_SIZE_MAX];
} udp;
static int (*deliver_fn) (void *msg, int msglen);
static void parse_rtattr(struct rtattr *tb[],
int max, struct rtattr *rta, int len)
{
while (RTA_OK(rta, len)) {
if (rta->rta_type <= max)
tb[rta->rta_type] = rta;
rta = RTA_NEXT(rta,len);
}
}
static int find_address(unsigned char ipaddr[BOOTH_IPADDR_LEN],
int family, int prefixlen,
int fuzzy_allowed,
struct booth_node **me)
{
int i;
struct booth_node *node;
int bytes, bits_left, mask;
unsigned char node_bits, ip_bits;
uint8_t *n_a;
bytes = prefixlen / 8;
bits_left = prefixlen % 8;
/* One bit left to check means ignore 7 lowest bits. */
mask = ~( (1 << (8 - bits_left)) -1);
for (i = 0; i < booth_conf->node_count; i++) {
node = booth_conf->node + i;
if (family != node->family)
continue;
n_a = node_to_addr_pointer(node);
if (memcmp(ipaddr, n_a, node->addrlen) == 0) {
found:
*me = node;
return 1;
}
if (!fuzzy_allowed)
continue;
// assert(bytes <= node->addrlen);
//#include <stdio.h>
// printf("node->addr %s, fam %d, prefix %d; %llx vs %llx, bytes %d\n", node->addr, node->family, prefixlen, *((long long*)&node->in6), *((long long*)ipaddr), bytes);
/* Check prefix, whole bytes */
if (memcmp(ipaddr, n_a, bytes) != 0)
continue;
//printf("bits %d\n", bits_left);
if (!bits_left)
goto found;
node_bits = n_a[bytes];
ip_bits = ipaddr[bytes];
//printf("nodebits %x ip %x mask %x\n", node_bits, ip_bits, mask);
if (((node_bits ^ ip_bits) & mask) == 0)
goto found;
}
return 0;
}
int find_myself(struct booth_node **mep, int fuzzy_allowed)
{
int fd;
struct sockaddr_nl nladdr;
struct booth_node *me;
unsigned char ipaddr[BOOTH_IPADDR_LEN];
static char rcvbuf[NETLINK_BUFSIZE];
struct {
struct nlmsghdr nlh;
struct rtgenmsg g;
} req;
if (local)
goto found;
me = NULL;
if (mep)
*mep = NULL;
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (fd < 0) {
log_error("failed to create netlink socket");
return 0;
}
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf));
memset(&nladdr, 0, sizeof(nladdr));
nladdr.nl_family = AF_NETLINK;
memset(&req, 0, sizeof(req));
req.nlh.nlmsg_len = sizeof(req);
req.nlh.nlmsg_type = RTM_GETADDR;
req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = 1;
req.g.rtgen_family = AF_INET;
if (sendto(fd, (void *)&req, sizeof(req), 0,
(struct sockaddr*)&nladdr, sizeof(nladdr)) < 0) {
close(fd);
log_error("failed to send data to netlink socket");
return 0;
}
while (1) {
int status;
struct nlmsghdr *h;
struct iovec iov = { rcvbuf, sizeof(rcvbuf) };
struct msghdr msg = {
(void *)&nladdr, sizeof(nladdr),
&iov, 1,
NULL, 0,
0
};
status = recvmsg(fd, &msg, 0);
if (!status) {
close(fd);
log_error("failed to recvmsg from netlink socket");
return 0;
}
h = (struct nlmsghdr *)rcvbuf;
if (h->nlmsg_type == NLMSG_DONE)
break;
if (h->nlmsg_type == NLMSG_ERROR) {
close(fd);
log_error("netlink socket recvmsg error");
return 0;
}
while (NLMSG_OK(h, status)) {
if (h->nlmsg_type == RTM_NEWADDR) {
struct ifaddrmsg *ifa = NLMSG_DATA(h);
struct rtattr *tb[IFA_MAX+1];
int len = h->nlmsg_len
- NLMSG_LENGTH(sizeof(*ifa));
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), len);
memset(ipaddr, 0, BOOTH_IPADDR_LEN);
memcpy(ipaddr, RTA_DATA(tb[IFA_ADDRESS]),
BOOTH_IPADDR_LEN);
if (find_address(ipaddr,
ifa->ifa_family, ifa->ifa_prefixlen,
fuzzy_allowed, &me))
goto out;
}
h = NLMSG_NEXT(h, status);
}
}
out:
close(fd);
if (!me)
return 0;
me->local = 1;
local = me;
found:
if (mep)
*mep = local;
return 1;
}
static int booth_get_myid(void)
{
return local ? local->nodeid : -1;
}
static void process_dead(int ci)
{
struct tcp_conn *conn, *safe;
list_for_each_entry_safe(conn, safe, &tcp, list) {
if (conn->s == client[ci].fd) {
list_del(&conn->list);
free(conn);
break;
}
}
close(client[ci].fd);
client[ci].workfn = NULL;
client[ci].fd = -1;
pollfd[ci].fd = -1;
}
static void process_tcp_listener(int ci)
{
int fd, i, one = 1;
socklen_t addrlen = sizeof(struct sockaddr);
struct sockaddr addr;
struct tcp_conn *conn;
fd = accept(client[ci].fd, &addr, &addrlen);
if (fd < 0) {
log_error("process_tcp_listener: accept error %d %d",
fd, errno);
return;
}
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof(one));
conn = malloc(sizeof(struct tcp_conn));
if (!conn) {
log_error("failed to alloc mem");
return;
}
memset(conn, 0, sizeof(struct tcp_conn));
conn->s = fd;
memcpy(&conn->to, &addr, sizeof(struct sockaddr));
list_add_tail(&conn->list, &tcp);
i = client_add(fd, process_connection, process_dead);
log_debug("client connection %d fd %d", i, fd);
}
static int setup_tcp_listener(void)
{
int s, rv;
s = socket(local->family, SOCK_STREAM, 0);
if (s == -1) {
log_error("failed to create tcp socket %s", strerror(errno));
return s;
}
rv = bind(s, &local->sa6, local->saddrlen);
if (rv == -1) {
log_error("failed to bind socket %s", strerror(errno));
return rv;
}
rv = listen(s, 5);
if (rv == -1) {
log_error("failed to listen on socket %s", strerror(errno));
return rv;
}
return s;
}
static int booth_tcp_init(void * unused __attribute__((unused)))
{
int rv;
if (booth_get_myid() < 0)
return -1;
rv = setup_tcp_listener();
if (rv < 0)
return rv;
client_add(rv, process_tcp_listener, NULL);
return 0;
}
static int connect_nonb(int sockfd, const struct sockaddr *saptr,
socklen_t salen, int sec)
{
int flags, n, error;
socklen_t len;
fd_set rset, wset;
struct timeval tval;
flags = fcntl(sockfd, F_GETFL, 0);
fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
error = 0;
if ( (n = connect(sockfd, saptr, salen)) < 0)
if (errno != EINPROGRESS)
return -1;
if (n == 0)
goto done; /* connect completed immediately */
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
wset = rset;
tval.tv_sec = sec;
tval.tv_usec = 0;
if ((n = select(sockfd + 1, &rset, &wset, NULL,
sec ? &tval : NULL)) == 0) {
/* leave outside function to close */
/* timeout */
/* close(sockfd); */
errno = ETIMEDOUT;
return -1;
}
if (FD_ISSET(sockfd, &rset) || FD_ISSET(sockfd, &wset)) {
len = sizeof(error);
if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
return -1; /* Solaris pending error */
} else {
log_error("select error: sockfd not set");
return -1;
}
done:
fcntl(sockfd, F_SETFL, flags); /* restore file status flags */
if (error) {
/* leave outside function to close */
/* close(sockfd); */
errno = error;
return -1;
}
return 0;
}
int booth_tcp_open(struct booth_node *to)
{
int s, rv;
if (to->tcp_fd >= 0)
goto found;
s = socket(to->family, SOCK_STREAM, 0);
if (s == -1) {
log_error("cannot create socket of family %d", to->family);
return -1;
}
rv = connect_nonb(s, (struct sockaddr *)&to->sa6, to->saddrlen, 10);
if (rv == -1) {
if( errno == ETIMEDOUT)
log_error("connection to %s timeout", to->addr_string);
else
log_error("connection to %s error %s", to->addr_string,
strerror(errno));
goto error;
}
to->tcp_fd = s;
found:
return 1;
error:
if (s >= 0)
close(s);
return -1;
}
int booth_tcp_send(struct booth_node *to, void *buf, int len)
{
return do_write(to->tcp_fd, buf, len);
}
static int booth_tcp_recv(struct booth_node *from, void *buf, int len)
{
return do_read(from->tcp_fd, buf, len);
}
static int booth_tcp_close(struct booth_node *to)
{
if (to && to->tcp_fd >= 0) {
close(to->tcp_fd);
to->tcp_fd = -1;
}
return 0;
}
static int booth_tcp_exit(void)
{
return 0;
}
-static int setup_udp_server(void)
+int setup_udp_server(int try_only)
{
int rv;
unsigned int recvbuf_size;
udp.s = socket(local->family, SOCK_DGRAM, 0);
if (udp.s == -1) {
log_error("failed to create udp socket %s", strerror(errno));
return -1;
}
rv = fcntl(udp.s, F_SETFL, O_NONBLOCK);
if (rv == -1) {
log_error("failed to set non-blocking operation "
"on udp socket: %s", strerror(errno));
close(udp.s);
return -1;
}
rv = bind(udp.s, (struct sockaddr *)&local->sa6, local->saddrlen);
+ if (try_only) {
+ rv = (rv == -1) ? errno : 0;
+ close(udp.s);
+ return rv;
+ }
+
if (rv == -1) {
log_error("failed to bind socket %s", strerror(errno));
close(udp.s);
return -1;
}
recvbuf_size = SOCKET_BUFFER_SIZE;
rv = setsockopt(udp.s, SOL_SOCKET, SO_RCVBUF,
&recvbuf_size, sizeof(recvbuf_size));
if (rv == -1) {
log_error("failed to set recvbuf size");
close(udp.s);
return -1;
}
return udp.s;
}
static void process_recv(int ci)
{
struct msghdr msg_recv;
struct sockaddr_storage system_from;
int received;
unsigned char *msg_offset;
msg_recv.msg_name = &system_from;
msg_recv.msg_namelen = sizeof (struct sockaddr_storage);
msg_recv.msg_iov = &udp.iov_recv;
msg_recv.msg_iovlen = 1;
msg_recv.msg_control = 0;
msg_recv.msg_controllen = 0;
msg_recv.msg_flags = 0;
received = recvmsg(client[ci].fd, &msg_recv,
MSG_NOSIGNAL | MSG_DONTWAIT);
if (received == -1)
return;
msg_offset = udp.iov_recv.iov_base;
deliver_fn(msg_offset, received);
}
static int booth_udp_init(void *f)
{
memset(&udp, 0, sizeof(struct udp_context));
udp.iov_recv.iov_base = udp.iov_buffer;
udp.iov_recv.iov_len = FRAME_SIZE_MAX;
- udp.s = setup_udp_server();
+ udp.s = setup_udp_server(0);
if (udp.s == -1)
return -1;
deliver_fn = f;
client_add(udp.s, process_recv, NULL);
return 0;
}
static int booth_udp_send(struct booth_node *to, void *buf, int len)
{
struct msghdr msg;
struct iovec iovec;
unsigned int iov_len;
int rv;
iovec.iov_base = (void *)buf;
iovec.iov_len = len;
iov_len = 1;
msg.msg_name = &to->sa6;
msg.msg_namelen = to->addrlen;
msg.msg_iov = (void *)&iovec;
msg.msg_iovlen = iov_len;
msg.msg_control = 0;
msg.msg_controllen = 0;
msg.msg_flags = 0;
rv = sendmsg(udp.s, &msg, MSG_NOSIGNAL);
if (rv < 0)
return rv;
return 0;
}
static int booth_udp_broadcast(void *buf, int len)
{
int i;
if (!booth_conf || !booth_conf->node_count)
return -1;
for (i = 0; i < booth_conf->node_count; i++)
booth_udp_send(booth_conf->node+i, buf, len);
return 0;
}
static int booth_udp_exit(void)
{
return 0;
}
/* SCTP transport layer has not been developed yet */
static int booth_sctp_init(void *f __attribute__((unused)))
{
return 0;
}
static int booth_sctp_send(struct booth_node * to __attribute__((unused)),
void *buf __attribute__((unused)),
int len __attribute__((unused)))
{
return 0;
}
static int booth_sctp_broadcast(void *buf __attribute__((unused)),
int len __attribute__((unused)))
{
return 0;
}
static int booth_sctp_exit(void)
{
return 0;
}
const struct booth_transport booth_transport[TRANSPORT_ENTRIES] = {
[TCP] = {
.name = "TCP",
.init = booth_tcp_init,
.get_myid = booth_get_myid,
.open = booth_tcp_open,
.send = booth_tcp_send,
.recv = booth_tcp_recv,
.close = booth_tcp_close,
.exit = booth_tcp_exit
},
[UDP] = {
.name = "UDP",
.init = booth_udp_init,
.get_myid = booth_get_myid,
.send = booth_udp_send,
.broadcast = booth_udp_broadcast,
.exit = booth_udp_exit
},
[SCTP] = {
.name = "SCTP",
.init = booth_sctp_init,
.get_myid = booth_get_myid,
.send = booth_sctp_send,
.broadcast = booth_sctp_broadcast,
.exit = booth_sctp_exit
}
};
const struct booth_transport *local_transport = booth_transport+TCP;
diff --git a/src/transport.h b/src/transport.h
index 44cc1d4..a398d28 100644
--- a/src/transport.h
+++ b/src/transport.h
@@ -1,84 +1,86 @@
/*
* Copyright (C) 2011 Jiaju Zhang <jjzhang@suse.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _TRANSPORT_H
#define _TRANSPORT_H
#include "booth.h"
struct booth_node {
int nodeid;
int type;
int local;
char addr_string[BOOTH_NAME_LEN];
int tcp_fd;
unsigned short family;
union {
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
};
int saddrlen;
int addrlen;
} __attribute__((packed));
typedef enum {
TCP = 0,
UDP = 1,
SCTP = 2,
TRANSPORT_ENTRIES = 3,
} transport_layer_t;
typedef enum {
ARBITRATOR = 1,
SITE,
CLIENT,
} node_type_t;
struct booth_transport {
const char *name;
int (*init) (void *);
int (*get_myid) (void);
int (*open) (struct booth_node *);
int (*send) (struct booth_node *, void *, int);
int (*recv) (struct booth_node *, void *, int);
int (*broadcast) (void *, int);
int (*close) (struct booth_node *);
int (*exit) (void);
};
const struct booth_transport booth_transport[TRANSPORT_ENTRIES];
int find_myself(struct booth_node **me, int fuzzy_allowed);
+int setup_udp_server(int try_only);
+
int booth_tcp_open(struct booth_node *to);
int booth_tcp_send(struct booth_node *to, void *buf, int len);
inline static void * node_to_addr_pointer(struct booth_node *node) {
switch (node->family) {
case AF_INET: return &node->sa4.sin_addr;
case AF_INET6: return &node->sa6.sin6_addr;
}
return NULL;
}
extern const struct booth_transport *local_transport;
extern struct booth_node *local;
#endif /* _TRANSPORT_H */

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