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GNU GENERAL PUBLIC LICENSE
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#
# This file is part of udpxd.
#
# Copyright (C) 2015 T.v.Dein.
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 program. If not, see <http://www.gnu.org/licenses/>.
#
# You can contact me by mail: <tom AT vondein DOT org>.
CFLAGS = -Wall -Wextra -Werror -O2 -g
LDFLAGS=
OBJS = client.o net.o udpxd.o
DST = udpxd
PREFIX = /usr/local
UID = root
GID = 0
MAN = udpxd.1
all: $(DST)
$(DST): $(OBJS)
gcc $(OBJS) -o $(DST)
%.o: %.c
gcc -c $(CFLAGS) $*.c -o $*.o
clean:
rm -f *.o $(DST)
man:
pod2man udpxd.pod > udpxd.1
install: $(DST)
install -d -o $(UID) -g $(GID) $(PREFIX)/sbin
install -d -o $(UID) -g $(GID) $(PREFIX)/man/man1
install -o $(UID) -g $(GID) -m 555 $(DST) $(PREFIX)/sbin/
install -o $(UID) -g $(GID) -m 444 $(MAN) $(PREFIX)/man/man1/

68
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# udpxd # UDPXD - A general purpose UDP relay/port forwarder/proxy
A general purpose UDP relay/port forwarder/proxy
This is the README file for the network program udpxd.
udpxd can be used to forward or proxy UDP client traffic
to another port on another system. It also supports binding
to a specific ip address which will be used as the source
for outgoing packets.
# Documentation
You can read the documentation without installing the
software:
perldoc udpxd.pod
If it is already installed, you can read the manual page:
man udpxd
# Installation
This software doesn't have eny external dependencies, but
you need either BSD make or GNU make installed.
First you need to check out the source code. Skip this, if
you have already done so:
git clone git@github.com:TLINDEN/udpxd.git
Next, change into the newly created directory 'udpxd' and
compile the source code:
cd udpxd
make
To install, type this command:
sudo make install
This will install the binary to `$PREFIX/sbin/udpxd` and
the manual page to `$PREFIX/man/man1/udpxd.1`. You can
modify `$PREFIX` during installation time like this:
make install PREFIX=/opt
# Getting help
Although I'm happy to hear from module users in private email,
that's the best way for me to forget to do something.
In order to report a bug, unexpected behavior, feature requests
or to submit a patch, please open an issue on github:
https://github.com/TLINDEN/udpxd/issues.
# Copyright and license
This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.
# Authors
T.v.Dein <tom AT vondein DOT org>
# Project homepage
https://github.com/TLINDEN/udpxd

9
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MUST:
- support ipv6
- daemonize
- syslog
MAYBE:
- ctrl client to view current "sessions", refresh etc
- config file
- support multiple different setups with one process

85
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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#include "client.h"
void client_del(client_t *client) {
HASH_DEL(clients, client);
}
void client_add(client_t *client) {
HASH_ADD_INT(clients, socket, client);
}
client_t *client_find_fd(int fd) {
client_t *client = NULL;
HASH_FIND_INT(clients, &fd, client);
return client; /* maybe NULL! */
}
client_t *client_find_src(struct sockaddr_in *src) {
client_t *current = NULL;
client_iter(clients, current) {
if (current->src == src)
return current;
}
return NULL;
}
void client_seen(client_t *client) {
client->lastseen = (long)time(0);
}
client_t *client_new(int fd, struct sockaddr_in *src, struct sockaddr_in *dst) {
client_t *client = malloc(sizeof(client_t));
client->socket = fd;
client->src = src;
client->dst = dst;
client_seen(client);
return client;
}
void client_close(client_t *client) {
if(VERBOSE) {
char *srcip = inet_ntoa(client->src->sin_addr);
char *bindip = inet_ntoa(client->dst->sin_addr);
fprintf(stderr, "closing socket %s:%d for client %s:%d (aged out)\n",
srcip, ntohs(client->src->sin_port), bindip, ntohs(client->dst->sin_port));
}
client_del(client);
close(client->socket);
free(client->src);
free(client->dst);
free(client);
}
void client_clean() {
uint32_t now = (long)time(0);
uint32_t diff;
client_t *current;
client_iter(clients, current) {
diff = now - current->lastseen;
if(diff >= MAXAGE) {
client_close(current);
}
}
}

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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#ifndef _HAVE_CLIENT_H
#define _HAVE_CLIENT_H
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifndef byte
typedef uint8_t byte;
#endif
#include "uthash.h"
#define MAXAGE 3600 /* seconds after which to close outgoing sockets and forget client src */
struct _client_t {
int socket; /* bind socket for outgoing traffic */
struct sockaddr_in *src; /* client src (ip+port) from incoming socket */
struct sockaddr_in *dst; /* client dst (ip+port) to outgoing socket */
uint64_t lastseen; /* when did we recv last time from it */
UT_hash_handle hh;
};
typedef struct _client_t client_t;
extern client_t *clients;
extern int VERBOSE;
/* wrapper for HASH_ITER */
/** Iterate over the list of clients.
Sample use:
@code
client_t *current = NULL;
client_iter(clientlist, current) {
dosomething(current)
}
@endcode
*/
#define client_iter(clients, client) \
client_t *__c = NULL; \
HASH_ITER(hh, clients, client, __c)
void client_del(client_t *client);
void client_add(client_t *client);
void client_seen(client_t *client);
void client_close(client_t *client);
void client_clean();
client_t *client_find_fd(int fd);
client_t *client_find_src(struct sockaddr_in *src);
client_t *client_new(int fd, struct sockaddr_in *src, struct sockaddr_in *dst);
#endif

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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#include "net.h"
#include "client.h"
char *ntoa(struct sockaddr_in *src) {
char *ip;
ip = inet_ntoa(src->sin_addr);
return ip;
}
/* called each time when the loop restarts to feed select() correctly */
int fill_set(fd_set *fds) {
int max = 0;
client_t *current = NULL;
client_iter(clients, current) {
if (current->socket < (int)FD_SETSIZE) {
if (current->socket > max)
max = current->socket;
FD_SET(current->socket, fds);
}
else {
fprintf(stderr, "skipped client, socket too large!\n");
}
}
return max;
}
/* return file handle ready to read */
int get_sender(fd_set *fds) {
int i = 0;
while(!FD_ISSET(i, fds))
i++;
return i;
}
/* bind to a socket, either for listen() or for outgoing src ip binding */
int bindsocket( char* ip, int port ) {
int fd;
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr( ip );
addr.sin_port = htons( port );
fd = socket( PF_INET, SOCK_DGRAM, IPPROTO_IP );
if( -1 == bind( fd, (struct sockaddr*)&addr, sizeof( addr ) ) ) {
fprintf( stderr, "Cannot bind address (%s:%d)\n", ip, port );
exit( 1 );
}
return fd;
}
/* handle new or known incoming requests */
void handle_inside(int inside, char *bindip, struct sockaddr_in *dst) {
int len;
unsigned char buffer[MAX_BUFFER_SIZE];
struct sockaddr_in *src;
client_t *client;
int output;
char *srcip;
char *dstip = ntoa(dst);
socklen_t size;
src = malloc(sizeof(struct sockaddr_in));
len = recvfrom( inside, buffer, sizeof( buffer ), 0,
(struct sockaddr*)src, &size );
srcip = ntoa(src);
if(VERBOSE) {
char *srcip = ntoa(src);
fprintf(stderr, "New incomming request from %s:%d with %d bytes\n",
srcip, ntohs(src->sin_port), len);
}
if(len > 0) {
/* do we know it ? */
client = client_find_src(src);
if(client != NULL) {
/* yes, we know it, send req out via existing bind socket */
if(VERBOSE) {
fprintf(stderr, "Client %s:%d is known, forwarding data to %s:%d\n",
srcip, ntohs(src->sin_port), dstip, ntohs(dst->sin_port));
}
if(sendto(client->socket, buffer, len, 0, (struct sockaddr*)dst, size) < 0) {
fprintf(stderr, "unable to forward to %s%d", dstip, ntohs(dst->sin_port));
perror(NULL);
}
else {
client_seen(client);
}
}
else {
/* unknown client, open new out socket */
if(VERBOSE) {
fprintf(stderr, "Client %s:%d is unknown, forwarding data to %s:%d ",
srcip, ntohs(src->sin_port), dstip, ntohs(dst->sin_port));
}
if(bindip == NULL)
output = bindsocket("0.0.0.0", 0);
else
output = bindsocket(bindip, 0);
/* send req out */
if(sendto(output, buffer, len, 0, (struct sockaddr*)dst, size) < 0) {
fprintf(stderr, "unable to forward to %s%d", dstip, ntohs(dst->sin_port));
perror(NULL);
}
else {
struct sockaddr_in *ret = malloc(size);
getsockname(output, (struct sockaddr*)ret, (socklen_t *)&size);
client = client_new(output, src, ret);
client_add(client);
if(VERBOSE) {
if(bindip != NULL) {
char *bindip = ntoa(ret);
fprintf(stderr, "from %s:%d\n", bindip, ntohs(ret->sin_port));
}
else {
fprintf(stderr, "\n");
}
}
}
}
}
}
/* handle answer from the outside */
void handle_outside(int inside, int outside) {
int len;
unsigned char buffer[MAX_BUFFER_SIZE];
struct sockaddr_in *src;
client_t *client;
socklen_t size;
src = malloc(sizeof(struct sockaddr_in));
len = recvfrom( outside, buffer, sizeof( buffer ), 0,
(struct sockaddr*)src, &size );
if(len > 0) {
/* do we know it? */
client = client_find_fd(outside);
if(client != NULL) {
/* yes, we know it */
if(sendto(inside, buffer, len, 0, (struct sockaddr*)client->src, size) < 0) {
perror("unable to send back to client"); /* FIXME: add src+port */
client_close(client);
}
}
}
}

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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#ifndef _HAVE_NET_H
#define _HAVE_NET_H
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <arpa/inet.h>
#include "client.h"
#define MAX_BUFFER_SIZE 65535
extern client_t *clients;
extern int VERBOSE;
int fill_set(fd_set *fds);
int get_sender(fd_set *fds);
int bindsocket( char* ip, int port );
void handle_inside(int inside, char *bindip, struct sockaddr_in *dst);
void handle_outside(int inside, int outside);
#endif

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.\" Automatically generated by Pod::Man 2.23 (Pod::Simple 3.14)
.\"
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.\" ========================================================================
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.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.ie \n(.g .ds Aq \(aq
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.ie \nF \{\
. de IX
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. \" fudge factors for nroff and troff
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.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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.if \n(.H>23 .if \n(.V>19 \
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.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "UDPXD 1"
.TH UDPXD 1 "2015-04-21" "perl v5.12.4" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
udpxd \- A general purpose UDP relay/port forwarder/proxy
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& Usage: udpxd [\-lbdvhV]
\&
\& Options:
\& \-\-listen \-l <ip:port> listen for incoming requests
\& \-\-bind \-b <ip> bind ip used for outgoing requests
\& \-\-dest \-d <ip:port> destination to forward requests to
\& \-\-help \-h \-? print help message
\& \-\-version \-v print program version
\& \-\-verbose \-V enable verbose logging
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
udpxd can be used to forward or proxy \s-1UDP\s0 client traffic
to another port on another system. It also supports binding
to a specific ip address which will be used as the source
for outgoing packets.
.PP
It listens on the ip address and port specified with \fB\-l\fR
and waits for incoming udp packets. If one arrives, it sends
it to the destination specified with \fB\-d\fR. Responses will
be sent back accordingly.
.PP
If \fB\-b\fR has not been specified, udpxd uses the operating
systems default (e.g. routing) as the source where it sends
requests packets out. If \fB\-b\fR has been specified, then it
binds to the given ip address and uses this as the source
address.
.PP
In any case, udpxd behaves like a proxy. The receiving end
(\fB\-d\fR) only sees the source ip address of the outgoing
interface of the system running udpxd or the address specified
with \fB\-b\fR.
.PP
The options \fB\-l\fR and \fB\-d\fR are mandatory.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Let's say you operate a multihomed unix system named 'foo'
with two interfaces: eth0 on the inside, eth1 on the outside:
.PP
.Vb 3
\& foo:
\& eth0: 192.168.1.1
\& eth0: 10.0.0.1
.Ve
.PP
And let's say, you have a client in network 10.0.0.0/24 who whiches to reach
an ntp server in network 192.168.1.1; and you dont operate a
firewall, nat or routing on 'foo'. Run udpxd like this:
.PP
.Vb 1
\& udpxd \-l 10.0.0.1:123 \-d 192.168.1.199:123
.Ve
.PP
Now, if a client with the source ip address 10.0.0.110 sends
an ntp request to 10.0.0.1:123, udpxd will forward that
request to 192.168.1.199:123 with the source ip address
192.168.1.1 (because this is where the route points to: eth0).
Responses from the ntp server will reach udpxd, which in turn
sends them back to the client, where they arrive with the source
address (and port) where udpxd is listening.
.PP
As you can see, udpxd canbe used to implement hiding nat for
udp services in user space.
.PP
Another example would be, if 'foo' has multiple ip addresses
on eth0 (aliases) and you don't want to use the primary address
of the interface for outgoing packets.
.PP
.Vb 3
\& foo, again:
\& eth0: 192.168.1.1,192.168.1.45
\& eth0: 10.0.0.1
.Ve
.PP
In order to use 192.168.1.45 as the source ip address, use the
\&\fB\-b\fR parameter:
.PP
.Vb 1
\& udpxd \-l 10.0.0.1:123 \-d 192.168.1.199:123 \-b 192.168.1.45
.Ve
.PP
In this case for the client everything looks as before, but the
ntp server on the other end will see ntp requests coming from
192.168.1.45.
.SH "FILES"
.IX Header "FILES"
udpxd currently does not write or open any files.
.SH "BUGS"
.IX Header "BUGS"
In order to report a bug, unexpected behavior, feature requests
or to submit a patch, please open an issue on github:
<https://github.com/TLINDEN/udpxd/issues>.
.SH "LICENSE"
.IX Header "LICENSE"
This software is licensed under the \s-1GNU\s0 \s-1GENERAL\s0 \s-1PUBLIC\s0 \s-1LICENSE\s0 version 3.
.SH "AUTHORS"
.IX Header "AUTHORS"
T.v.Dein \fBtom \s-1AT\s0 vondein \s-1DOT\s0 org\fR

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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#include "udpxd.h"
#include "net.h"
#include "client.h"
/* global client list */
client_t *clients = NULL;
int VERBOSE = 0;
/* runs forever, handles incoming requests on the inside and answers on the outside */
int main_loop(int listensocket, char *bindip, struct sockaddr_in *dst) {
int max, sender;
fd_set fds;
for(;;) {
FD_ZERO(&fds);
max = fill_set(&fds);
FD_SET(listensocket, &fds);
if (listensocket > max)
max = listensocket;
select(max + 1, &fds, NULL, NULL, NULL);
if (FD_ISSET(listensocket, &fds)) {
/* incoming client on the inside, get src, bind output fd, add to list
if known, otherwise just handle it */
handle_inside(listensocket, bindip, dst);
}
else {
/* remote answer came in on an output fd, proxy back to the inside */
sender = get_sender(&fds);
handle_outside(listensocket, sender);
}
/* close old outputs, if any */
client_clean();
}
}
int main ( int argc, char* argv[] ) {
int listen, opt;
char *inip, *inpt, *srcip, *dstip, *dstpt;
struct sockaddr_in *dst;
char colon[] = ":";
static struct option longopts[] = {
{ "listen", required_argument, NULL, 'l' },
{ "bind", required_argument, NULL, 'b' },
{ "dest", required_argument, NULL, 'd' },
{ "version", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ "verbose", no_argument, NULL, 'V' }
};
if( argc < 2 ) {
usage();
return 1;
}
srcip = dstip = inip = dstpt = inpt = NULL;
while ((opt = getopt_long(argc, argv, "l:b:d:vVh?", longopts, NULL)) != -1) {
switch (opt) {
case 'v':
fprintf(stderr, "This is %s version %s\n", argv[0], UDPXD_VERSION);
return 1;
break;
case 'h':
case '?':
usage();
return 1;
break;
case 'V':
VERBOSE = 1;
break;
case 'l':
if(strchr(optarg, ':')) {
char *ptr = NULL;
ptr = strtok(optarg, colon);
inip = malloc( strlen(ptr)+1);
strncpy(inip, ptr, strlen(ptr)+1);
ptr = strtok(NULL, colon);
if(ptr != NULL) {
inpt = malloc( strlen(ptr)+1);
strncpy(inpt, ptr, strlen(ptr)+1);
}
else {
fprintf(stderr, "Listen port for parameter -l is missing!\n");
return 0;
}
}
else {
fprintf(stderr, "Parameter -l has the format <ip-address:port>!\n");
return 0;
}
break;
case 'd':
if(strchr(optarg, ':')) {
char *ptr = NULL;
ptr = strtok(optarg, colon);
dstip = malloc( strlen(ptr)+1);
strncpy(dstip, ptr, strlen(ptr)+1);
ptr = strtok(NULL, colon);
if(ptr != NULL) {
dstpt = malloc( strlen(ptr)+1);
strncpy(dstpt, ptr, strlen(ptr)+1);
}
else {
fprintf(stderr, "Destination port for parameter -d is missing!\n");
return 0;
}
}
else {
fprintf(stderr, "Parameter -d has the format <ip-address:port>!\n");
return 0;
}
break;
case 'b':
srcip = malloc(strlen(optarg));
strncpy(srcip, optarg, strlen(optarg));
break;
default:
usage();
return 1;
break;
}
}
if(inip == NULL) {
fprintf(stderr, "-l parameter is required!\n");
usage();
return 1;
}
if(dstip == NULL) {
fprintf(stderr, "-d parameter is required!\n");
usage();
return 1;
}
listen = bindsocket(inip, atoi(inpt));
dst = malloc(sizeof(struct sockaddr_in));
dst->sin_family = AF_INET;
dst->sin_addr.s_addr = inet_addr( dstip );
dst->sin_port = htons( atoi( dstpt ) );
if(VERBOSE) {
fprintf(stderr, "Listening on %s:%s, forwarding to %s:%s",
inip, inpt, dstip, dstpt);
if(srcip != NULL)
fprintf(stderr, ", binding to %s\n", srcip);
else
fprintf(stderr, "\n");
}
main_loop(listen, srcip, dst);
/* FIXME: add sighandler, clean up mem */
return 0;
}
void usage() {
fprintf(stderr,
"Usage: udpxd [-lbdvhV]\n\n"
"Options:\n"
"--listen -l <ip:port> listen for incoming requests\n"
"--bind -b <ip> bind ip used for outgoing requests\n"
"--dest -d <ip:port> destination to forward requests to\n"
"--help -h -? print help message\n"
"--version -v print program version\n"
"--verbose -V enable verbose logging\n\n"
"Options -l and -d are mandatory.\n\n"
"This is udpxd version %s.\n", UDPXD_VERSION
);
}

45
udpxd.h Normal file
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/*
This file is part of udpxd.
Copyright (C) 2015 T.v.Dein.
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 3 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tom AT vondein DOT org>.
*/
#ifndef _HAVE_UDPXD_H
#define _HAVE_UDPXD_H
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <time.h>
#include <getopt.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <arpa/inet.h>
#define UDPXD_VERSION "0.0.1"
int main_loop(int listensocket, char *bindip, struct sockaddr_in *dst);
void usage();
#endif

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=head1 NAME
udpxd - A general purpose UDP relay/port forwarder/proxy
=head1 SYNOPSIS
Usage: udpxd [-lbdvhV]
Options:
--listen -l <ip:port> listen for incoming requests
--bind -b <ip> bind ip used for outgoing requests
--dest -d <ip:port> destination to forward requests to
--help -h -? print help message
--version -v print program version
--verbose -V enable verbose logging
=head1 DESCRIPTION
udpxd can be used to forward or proxy UDP client traffic
to another port on another system. It also supports binding
to a specific ip address which will be used as the source
for outgoing packets.
It listens on the ip address and port specified with B<-l>
and waits for incoming udp packets. If one arrives, it sends
it to the destination specified with B<-d>. Responses will
be sent back accordingly.
If B<-b> has not been specified, udpxd uses the operating
systems default (e.g. routing) as the source where it sends
requests packets out. If B<-b> has been specified, then it
binds to the given ip address and uses this as the source
address.
In any case, udpxd behaves like a proxy. The receiving end
(B<-d>) only sees the source ip address of the outgoing
interface of the system running udpxd or the address specified
with B<-b>.
The options B<-l> and B<-d> are mandatory.
=head1 EXAMPLES
Let's say you operate a multihomed unix system named 'foo'
with two interfaces: eth0 on the inside, eth1 on the outside:
foo:
eth0: 192.168.1.1
eth0: 10.0.0.1
And let's say, you have a client in network 10.0.0.0/24 who whiches to reach
an ntp server in network 192.168.1.1; and you dont operate a
firewall, nat or routing on 'foo'. Run udpxd like this:
udpxd -l 10.0.0.1:123 -d 192.168.1.199:123
Now, if a client with the source ip address 10.0.0.110 sends
an ntp request to 10.0.0.1:123, udpxd will forward that
request to 192.168.1.199:123 with the source ip address
192.168.1.1 (because this is where the route points to: eth0).
Responses from the ntp server will reach udpxd, which in turn
sends them back to the client, where they arrive with the source
address (and port) where udpxd is listening.
As you can see, udpxd canbe used to implement hiding nat for
udp services in user space.
Another example would be, if 'foo' has multiple ip addresses
on eth0 (aliases) and you don't want to use the primary address
of the interface for outgoing packets.
foo, again:
eth0: 192.168.1.1,192.168.1.45
eth0: 10.0.0.1
In order to use 192.168.1.45 as the source ip address, use the
B<-b> parameter:
udpxd -l 10.0.0.1:123 -d 192.168.1.199:123 -b 192.168.1.45
In this case for the client everything looks as before, but the
ntp server on the other end will see ntp requests coming from
192.168.1.45.
=head1 FILES
udpxd currently does not write or open any files.
=head1 BUGS
In order to report a bug, unexpected behavior, feature requests
or to submit a patch, please open an issue on github:
L<https://github.com/TLINDEN/udpxd/issues>.
=head1 LICENSE
This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.
Copyright (c) 2015 by T. v. Dein.
This software uses B<uthash> (bundled), which is
Copyright (c) 2003-2013 by Troy D. Hanson.
=head1 AUTHORS
T.v.Dein B<tom AT vondein DOT org>
=cut

948
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@@ -0,0 +1,948 @@
/*
Copyright (c) 2003-2013, Troy D. Hanson http://troydhanson.github.com/uthash/
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
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.
*/
#ifndef UTHASH_H
#define UTHASH_H
#include <string.h> /* memcmp,strlen */
#include <stddef.h> /* ptrdiff_t */
#include <stdlib.h> /* exit() */
/* These macros use decltype or the earlier __typeof GNU extension.
As decltype is only available in newer compilers (VS2010 or gcc 4.3+
when compiling c++ source) this code uses whatever method is needed
or, for VS2008 where neither is available, uses casting workarounds. */
#ifdef _MSC_VER /* MS compiler */
#if _MSC_VER >= 1600 && defined(__cplusplus) /* VS2010 or newer in C++ mode */
#define DECLTYPE(x) (decltype(x))
#else /* VS2008 or older (or VS2010 in C mode) */
#define NO_DECLTYPE
#define DECLTYPE(x)
#endif
#else /* GNU, Sun and other compilers */
#define DECLTYPE(x) (__typeof(x))
#endif
#ifdef NO_DECLTYPE
#define DECLTYPE_ASSIGN(dst,src) \
do { \
char **_da_dst = (char**)(&(dst)); \
*_da_dst = (char*)(src); \
} while(0)
#else
#define DECLTYPE_ASSIGN(dst,src) \
do { \
(dst) = DECLTYPE(dst)(src); \
} while(0)
#endif
/* a number of the hash function use uint32_t which isn't defined on win32 */
#ifdef _MSC_VER
typedef unsigned int uint32_t;
typedef byte uint8_t;
#else
#include <inttypes.h> /* uint32_t */
#endif
#define UTHASH_VERSION 1.9.8
#ifndef uthash_fatal
#define uthash_fatal(msg) exit(-1) /* fatal error (out of memory,etc) */
#endif
#ifndef uthash_malloc
#define uthash_malloc(sz) malloc(sz) /* malloc fcn */
#endif
#ifndef uthash_free
#define uthash_free(ptr,sz) free(ptr) /* free fcn */
#endif
#ifndef uthash_noexpand_fyi
#define uthash_noexpand_fyi(tbl) /* can be defined to log noexpand */
#endif
#ifndef uthash_expand_fyi
#define uthash_expand_fyi(tbl) /* can be defined to log expands */
#endif
/* initial number of buckets */
#define HASH_INITIAL_NUM_BUCKETS 32 /* initial number of buckets */
#define HASH_INITIAL_NUM_BUCKETS_LOG2 5 /* lg2 of initial number of buckets */
#define HASH_BKT_CAPACITY_THRESH 10 /* expand when bucket count reaches */
/* calculate the element whose hash handle address is hhe */
#define ELMT_FROM_HH(tbl,hhp) ((void*)(((char*)(hhp)) - ((tbl)->hho)))
#define HASH_FIND(hh,head,keyptr,keylen,out) \
do { \
unsigned _hf_bkt,_hf_hashv; \
out=NULL; \
if (head) { \
HASH_FCN(keyptr,keylen, (head)->hh.tbl->num_buckets, _hf_hashv, _hf_bkt); \
if (HASH_BLOOM_TEST((head)->hh.tbl, _hf_hashv)) { \
HASH_FIND_IN_BKT((head)->hh.tbl, hh, (head)->hh.tbl->buckets[ _hf_bkt ], \
keyptr,keylen,out); \
} \
} \
} while (0)
#ifdef HASH_BLOOM
#define HASH_BLOOM_BITLEN (1ULL << HASH_BLOOM)
#define HASH_BLOOM_BYTELEN (HASH_BLOOM_BITLEN/8) + ((HASH_BLOOM_BITLEN%8) ? 1:0)
#define HASH_BLOOM_MAKE(tbl) \
do { \
(tbl)->bloom_nbits = HASH_BLOOM; \
(tbl)->bloom_bv = (uint8_t*)uthash_malloc(HASH_BLOOM_BYTELEN); \
if (!((tbl)->bloom_bv)) { uthash_fatal( "out of memory"); } \
memset((tbl)->bloom_bv, 0, HASH_BLOOM_BYTELEN); \
(tbl)->bloom_sig = HASH_BLOOM_SIGNATURE; \
} while (0)
#define HASH_BLOOM_FREE(tbl) \
do { \
uthash_free((tbl)->bloom_bv, HASH_BLOOM_BYTELEN); \
} while (0)
#define HASH_BLOOM_BITSET(bv,idx) (bv[(idx)/8] |= (1U << ((idx)%8)))
#define HASH_BLOOM_BITTEST(bv,idx) (bv[(idx)/8] & (1U << ((idx)%8)))
#define HASH_BLOOM_ADD(tbl,hashv) \
HASH_BLOOM_BITSET((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
#define HASH_BLOOM_TEST(tbl,hashv) \
HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
#else
#define HASH_BLOOM_MAKE(tbl)
#define HASH_BLOOM_FREE(tbl)
#define HASH_BLOOM_ADD(tbl,hashv)
#define HASH_BLOOM_TEST(tbl,hashv) (1)
#define HASH_BLOOM_BYTELEN 0
#endif
#define HASH_MAKE_TABLE(hh,head) \
do { \
(head)->hh.tbl = (UT_hash_table*)uthash_malloc( \
sizeof(UT_hash_table)); \
if (!((head)->hh.tbl)) { uthash_fatal( "out of memory"); } \
memset((head)->hh.tbl, 0, sizeof(UT_hash_table)); \
(head)->hh.tbl->tail = &((head)->hh); \
(head)->hh.tbl->num_buckets = HASH_INITIAL_NUM_BUCKETS; \
(head)->hh.tbl->log2_num_buckets = HASH_INITIAL_NUM_BUCKETS_LOG2; \
(head)->hh.tbl->hho = (char*)(&(head)->hh) - (char*)(head); \
(head)->hh.tbl->buckets = (UT_hash_bucket*)uthash_malloc( \
HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \
if (! (head)->hh.tbl->buckets) { uthash_fatal( "out of memory"); } \
memset((head)->hh.tbl->buckets, 0, \
HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \
HASH_BLOOM_MAKE((head)->hh.tbl); \
(head)->hh.tbl->signature = HASH_SIGNATURE; \
} while(0)
#define HASH_ADD(hh,head,fieldname,keylen_in,add) \
HASH_ADD_KEYPTR(hh,head,&((add)->fieldname),keylen_in,add)
#define HASH_REPLACE(hh,head,fieldname,keylen_in,add,replaced) \
do { \
replaced=NULL; \
HASH_FIND(hh,head,&((add)->fieldname),keylen_in,replaced); \
if (replaced!=NULL) { \
HASH_DELETE(hh,head,replaced); \
}; \
HASH_ADD(hh,head,fieldname,keylen_in,add); \
} while(0)
#define HASH_ADD_KEYPTR(hh,head,keyptr,keylen_in,add) \
do { \
unsigned _ha_bkt; \
(add)->hh.next = NULL; \
(add)->hh.key = (char*)(keyptr); \
(add)->hh.keylen = (unsigned)(keylen_in); \
if (!(head)) { \
head = (add); \
(head)->hh.prev = NULL; \
HASH_MAKE_TABLE(hh,head); \
} else { \
(head)->hh.tbl->tail->next = (add); \
(add)->hh.prev = ELMT_FROM_HH((head)->hh.tbl, (head)->hh.tbl->tail); \
(head)->hh.tbl->tail = &((add)->hh); \
} \
(head)->hh.tbl->num_items++; \
(add)->hh.tbl = (head)->hh.tbl; \
HASH_FCN(keyptr,keylen_in, (head)->hh.tbl->num_buckets, \
(add)->hh.hashv, _ha_bkt); \
HASH_ADD_TO_BKT((head)->hh.tbl->buckets[_ha_bkt],&(add)->hh); \
HASH_BLOOM_ADD((head)->hh.tbl,(add)->hh.hashv); \
HASH_EMIT_KEY(hh,head,keyptr,keylen_in); \
HASH_FSCK(hh,head); \
} while(0)
#define HASH_TO_BKT( hashv, num_bkts, bkt ) \
do { \
bkt = ((hashv) & ((num_bkts) - 1)); \
} while(0)
/* delete "delptr" from the hash table.
* "the usual" patch-up process for the app-order doubly-linked-list.
* The use of _hd_hh_del below deserves special explanation.
* These used to be expressed using (delptr) but that led to a bug
* if someone used the same symbol for the head and deletee, like
* HASH_DELETE(hh,users,users);
* We want that to work, but by changing the head (users) below
* we were forfeiting our ability to further refer to the deletee (users)
* in the patch-up process. Solution: use scratch space to
* copy the deletee pointer, then the latter references are via that
* scratch pointer rather than through the repointed (users) symbol.
*/
#define HASH_DELETE(hh,head,delptr) \
do { \
unsigned _hd_bkt; \
struct UT_hash_handle *_hd_hh_del; \
if ( ((delptr)->hh.prev == NULL) && ((delptr)->hh.next == NULL) ) { \
uthash_free((head)->hh.tbl->buckets, \
(head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
HASH_BLOOM_FREE((head)->hh.tbl); \
uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \
head = NULL; \
} else { \
_hd_hh_del = &((delptr)->hh); \
if ((delptr) == ELMT_FROM_HH((head)->hh.tbl,(head)->hh.tbl->tail)) { \
(head)->hh.tbl->tail = \
(UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) + \
(head)->hh.tbl->hho); \
} \
if ((delptr)->hh.prev) { \
((UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) + \
(head)->hh.tbl->hho))->next = (delptr)->hh.next; \
} else { \
DECLTYPE_ASSIGN(head,(delptr)->hh.next); \
} \
if (_hd_hh_del->next) { \
((UT_hash_handle*)((ptrdiff_t)_hd_hh_del->next + \
(head)->hh.tbl->hho))->prev = \
_hd_hh_del->prev; \
} \
HASH_TO_BKT( _hd_hh_del->hashv, (head)->hh.tbl->num_buckets, _hd_bkt); \
HASH_DEL_IN_BKT(hh,(head)->hh.tbl->buckets[_hd_bkt], _hd_hh_del); \
(head)->hh.tbl->num_items--; \
} \
HASH_FSCK(hh,head); \
} while (0)
/* convenience forms of HASH_FIND/HASH_ADD/HASH_DEL */
#define HASH_FIND_STR(head,findstr,out) \
HASH_FIND(hh,head,findstr,strlen(findstr),out)
#define HASH_ADD_STR(head,strfield,add) \
HASH_ADD(hh,head,strfield,strlen(add->strfield),add)
#define HASH_REPLACE_STR(head,strfield,add,replaced) \
HASH_REPLACE(hh,head,strfield,strlen(add->strfield),add,replaced)
#define HASH_FIND_INT(head,findint,out) \
HASH_FIND(hh,head,findint,sizeof(int),out)
#define HASH_ADD_INT(head,intfield,add) \
HASH_ADD(hh,head,intfield,sizeof(int),add)
#define HASH_REPLACE_INT(head,intfield,add,replaced) \
HASH_REPLACE(hh,head,intfield,sizeof(int),add,replaced)
#define HASH_FIND_PTR(head,findptr,out) \
HASH_FIND(hh,head,findptr,sizeof(void *),out)
#define HASH_ADD_PTR(head,ptrfield,add) \
HASH_ADD(hh,head,ptrfield,sizeof(void *),add)
#define HASH_REPLACE_PTR(head,ptrfield,add) \
HASH_REPLACE(hh,head,ptrfield,sizeof(void *),add,replaced)
#define HASH_DEL(head,delptr) \
HASH_DELETE(hh,head,delptr)
/* HASH_FSCK checks hash integrity on every add/delete when HASH_DEBUG is defined.
* This is for uthash developer only; it compiles away if HASH_DEBUG isn't defined.
*/
#ifdef HASH_DEBUG
#define HASH_OOPS(...) do { fprintf(stderr,__VA_ARGS__); exit(-1); } while (0)
#define HASH_FSCK(hh,head) \
do { \
unsigned _bkt_i; \
unsigned _count, _bkt_count; \
char *_prev; \
struct UT_hash_handle *_thh; \
if (head) { \
_count = 0; \
for( _bkt_i = 0; _bkt_i < (head)->hh.tbl->num_buckets; _bkt_i++) { \
_bkt_count = 0; \
_thh = (head)->hh.tbl->buckets[_bkt_i].hh_head; \
_prev = NULL; \
while (_thh) { \
if (_prev != (char*)(_thh->hh_prev)) { \
HASH_OOPS("invalid hh_prev %p, actual %p\n", \
_thh->hh_prev, _prev ); \
} \
_bkt_count++; \
_prev = (char*)(_thh); \
_thh = _thh->hh_next; \
} \
_count += _bkt_count; \
if ((head)->hh.tbl->buckets[_bkt_i].count != _bkt_count) { \
HASH_OOPS("invalid bucket count %d, actual %d\n", \
(head)->hh.tbl->buckets[_bkt_i].count, _bkt_count); \
} \
} \
if (_count != (head)->hh.tbl->num_items) { \
HASH_OOPS("invalid hh item count %d, actual %d\n", \
(head)->hh.tbl->num_items, _count ); \
} \
/* traverse hh in app order; check next/prev integrity, count */ \
_count = 0; \
_prev = NULL; \
_thh = &(head)->hh; \
while (_thh) { \
_count++; \
if (_prev !=(char*)(_thh->prev)) { \
HASH_OOPS("invalid prev %p, actual %p\n", \
_thh->prev, _prev ); \
} \
_prev = (char*)ELMT_FROM_HH((head)->hh.tbl, _thh); \
_thh = ( _thh->next ? (UT_hash_handle*)((char*)(_thh->next) + \
(head)->hh.tbl->hho) : NULL ); \
} \
if (_count != (head)->hh.tbl->num_items) { \
HASH_OOPS("invalid app item count %d, actual %d\n", \
(head)->hh.tbl->num_items, _count ); \
} \
} \
} while (0)
#else
#define HASH_FSCK(hh,head)
#endif
/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to
* the descriptor to which this macro is defined for tuning the hash function.
* The app can #include <unistd.h> to get the prototype for write(2). */
#ifdef HASH_EMIT_KEYS
#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen) \
do { \
unsigned _klen = fieldlen; \
write(HASH_EMIT_KEYS, &_klen, sizeof(_klen)); \
write(HASH_EMIT_KEYS, keyptr, fieldlen); \
} while (0)
#else
#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)
#endif
/* default to Jenkin's hash unless overridden e.g. DHASH_FUNCTION=HASH_SAX */
#ifdef HASH_FUNCTION
#define HASH_FCN HASH_FUNCTION
#else
#define HASH_FCN HASH_JEN
#endif
/* The Bernstein hash function, used in Perl prior to v5.6 */
#define HASH_BER(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _hb_keylen=keylen; \
char *_hb_key=(char*)(key); \
(hashv) = 0; \
while (_hb_keylen--) { (hashv) = ((hashv) * 33) + *_hb_key++; } \
bkt = (hashv) & (num_bkts-1); \
} while (0)
/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at
* http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */
#define HASH_SAX(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _sx_i; \
char *_hs_key=(char*)(key); \
hashv = 0; \
for(_sx_i=0; _sx_i < keylen; _sx_i++) \
hashv ^= (hashv << 5) + (hashv >> 2) + _hs_key[_sx_i]; \
bkt = hashv & (num_bkts-1); \
} while (0)
#define HASH_FNV(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _fn_i; \
char *_hf_key=(char*)(key); \
hashv = 2166136261UL; \
for(_fn_i=0; _fn_i < keylen; _fn_i++) \
hashv = (hashv * 16777619) ^ _hf_key[_fn_i]; \
bkt = hashv & (num_bkts-1); \
} while(0)
#define HASH_OAT(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _ho_i; \
char *_ho_key=(char*)(key); \
hashv = 0; \
for(_ho_i=0; _ho_i < keylen; _ho_i++) { \
hashv += _ho_key[_ho_i]; \
hashv += (hashv << 10); \
hashv ^= (hashv >> 6); \
} \
hashv += (hashv << 3); \
hashv ^= (hashv >> 11); \
hashv += (hashv << 15); \
bkt = hashv & (num_bkts-1); \
} while(0)
#define HASH_JEN_MIX(a,b,c) \
do { \
a -= b; a -= c; a ^= ( c >> 13 ); \
b -= c; b -= a; b ^= ( a << 8 ); \
c -= a; c -= b; c ^= ( b >> 13 ); \
a -= b; a -= c; a ^= ( c >> 12 ); \
b -= c; b -= a; b ^= ( a << 16 ); \
c -= a; c -= b; c ^= ( b >> 5 ); \
a -= b; a -= c; a ^= ( c >> 3 ); \
b -= c; b -= a; b ^= ( a << 10 ); \
c -= a; c -= b; c ^= ( b >> 15 ); \
} while (0)
#define HASH_JEN(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _hj_i,_hj_j,_hj_k; \
byte *_hj_key=(byte*)(key); \
hashv = 0xfeedbeef; \
_hj_i = _hj_j = 0x9e3779b9; \
_hj_k = (unsigned)(keylen); \
while (_hj_k >= 12) { \
_hj_i += (_hj_key[0] + ( (unsigned)_hj_key[1] << 8 ) \
+ ( (unsigned)_hj_key[2] << 16 ) \
+ ( (unsigned)_hj_key[3] << 24 ) ); \
_hj_j += (_hj_key[4] + ( (unsigned)_hj_key[5] << 8 ) \
+ ( (unsigned)_hj_key[6] << 16 ) \
+ ( (unsigned)_hj_key[7] << 24 ) ); \
hashv += (_hj_key[8] + ( (unsigned)_hj_key[9] << 8 ) \
+ ( (unsigned)_hj_key[10] << 16 ) \
+ ( (unsigned)_hj_key[11] << 24 ) ); \
\
HASH_JEN_MIX(_hj_i, _hj_j, hashv); \
\
_hj_key += 12; \
_hj_k -= 12; \
} \
hashv += keylen; \
switch ( _hj_k ) { \
case 11: hashv += ( (unsigned)_hj_key[10] << 24 ); \
case 10: hashv += ( (unsigned)_hj_key[9] << 16 ); \
case 9: hashv += ( (unsigned)_hj_key[8] << 8 ); \
case 8: _hj_j += ( (unsigned)_hj_key[7] << 24 ); \
case 7: _hj_j += ( (unsigned)_hj_key[6] << 16 ); \
case 6: _hj_j += ( (unsigned)_hj_key[5] << 8 ); \
case 5: _hj_j += _hj_key[4]; \
case 4: _hj_i += ( (unsigned)_hj_key[3] << 24 ); \
case 3: _hj_i += ( (unsigned)_hj_key[2] << 16 ); \
case 2: _hj_i += ( (unsigned)_hj_key[1] << 8 ); \
case 1: _hj_i += _hj_key[0]; \
} \
HASH_JEN_MIX(_hj_i, _hj_j, hashv); \
bkt = hashv & (num_bkts-1); \
} while(0)
/* The Paul Hsieh hash function */
#undef get16bits
#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
|| defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
#define get16bits(d) (*((const uint16_t *) (d)))
#endif
#if !defined (get16bits)
#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8) \
+(uint32_t)(((const uint8_t *)(d))[0]) )
#endif
#define HASH_SFH(key,keylen,num_bkts,hashv,bkt) \
do { \
byte *_sfh_key=(byte*)(key); \
uint32_t _sfh_tmp, _sfh_len = keylen; \
\
int _sfh_rem = _sfh_len & 3; \
_sfh_len >>= 2; \
hashv = 0xcafebabe; \
\
/* Main loop */ \
for (;_sfh_len > 0; _sfh_len--) { \
hashv += get16bits (_sfh_key); \
_sfh_tmp = (uint32_t)(get16bits (_sfh_key+2)) << 11 ^ hashv; \
hashv = (hashv << 16) ^ _sfh_tmp; \
_sfh_key += 2*sizeof (uint16_t); \
hashv += hashv >> 11; \
} \
\
/* Handle end cases */ \
switch (_sfh_rem) { \
case 3: hashv += get16bits (_sfh_key); \
hashv ^= hashv << 16; \
hashv ^= (uint32_t)(_sfh_key[sizeof (uint16_t)] << 18); \
hashv += hashv >> 11; \
break; \
case 2: hashv += get16bits (_sfh_key); \
hashv ^= hashv << 11; \
hashv += hashv >> 17; \
break; \
case 1: hashv += *_sfh_key; \
hashv ^= hashv << 10; \
hashv += hashv >> 1; \
} \
\
/* Force "avalanching" of final 127 bits */ \
hashv ^= hashv << 3; \
hashv += hashv >> 5; \
hashv ^= hashv << 4; \
hashv += hashv >> 17; \
hashv ^= hashv << 25; \
hashv += hashv >> 6; \
bkt = hashv & (num_bkts-1); \
} while(0)
#ifdef HASH_USING_NO_STRICT_ALIASING
/* The MurmurHash exploits some CPU's (x86,x86_64) tolerance for unaligned reads.
* For other types of CPU's (e.g. Sparc) an unaligned read causes a bus error.
* MurmurHash uses the faster approach only on CPU's where we know it's safe.
*
* Note the preprocessor built-in defines can be emitted using:
*
* gcc -m64 -dM -E - < /dev/null (on gcc)
* cc -## a.c (where a.c is a simple test file) (Sun Studio)
*/
#if (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86))
#define MUR_GETBLOCK(p,i) p[i]
#else /* non intel */
#define MUR_PLUS0_ALIGNED(p) (((unsigned long)p & 0x3) == 0)
#define MUR_PLUS1_ALIGNED(p) (((unsigned long)p & 0x3) == 1)
#define MUR_PLUS2_ALIGNED(p) (((unsigned long)p & 0x3) == 2)
#define MUR_PLUS3_ALIGNED(p) (((unsigned long)p & 0x3) == 3)
#define WP(p) ((uint32_t*)((unsigned long)(p) & ~3UL))
#if (defined(__BIG_ENDIAN__) || defined(SPARC) || defined(__ppc__) || defined(__ppc64__))
#define MUR_THREE_ONE(p) ((((*WP(p))&0x00ffffff) << 8) | (((*(WP(p)+1))&0xff000000) >> 24))
#define MUR_TWO_TWO(p) ((((*WP(p))&0x0000ffff) <<16) | (((*(WP(p)+1))&0xffff0000) >> 16))
#define MUR_ONE_THREE(p) ((((*WP(p))&0x000000ff) <<24) | (((*(WP(p)+1))&0xffffff00) >> 8))
#else /* assume little endian non-intel */
#define MUR_THREE_ONE(p) ((((*WP(p))&0xffffff00) >> 8) | (((*(WP(p)+1))&0x000000ff) << 24))
#define MUR_TWO_TWO(p) ((((*WP(p))&0xffff0000) >>16) | (((*(WP(p)+1))&0x0000ffff) << 16))
#define MUR_ONE_THREE(p) ((((*WP(p))&0xff000000) >>24) | (((*(WP(p)+1))&0x00ffffff) << 8))
#endif
#define MUR_GETBLOCK(p,i) (MUR_PLUS0_ALIGNED(p) ? ((p)[i]) : \
(MUR_PLUS1_ALIGNED(p) ? MUR_THREE_ONE(p) : \
(MUR_PLUS2_ALIGNED(p) ? MUR_TWO_TWO(p) : \
MUR_ONE_THREE(p))))
#endif
#define MUR_ROTL32(x,r) (((x) << (r)) | ((x) >> (32 - (r))))
#define MUR_FMIX(_h) \
do { \
_h ^= _h >> 16; \
_h *= 0x85ebca6b; \
_h ^= _h >> 13; \
_h *= 0xc2b2ae35l; \
_h ^= _h >> 16; \
} while(0)
#define HASH_MUR(key,keylen,num_bkts,hashv,bkt) \
do { \
const uint8_t *_mur_data = (const uint8_t*)(key); \
const int _mur_nblocks = (keylen) / 4; \
uint32_t _mur_h1 = 0xf88D5353; \
uint32_t _mur_c1 = 0xcc9e2d51; \
uint32_t _mur_c2 = 0x1b873593; \
uint32_t _mur_k1 = 0; \
const uint8_t *_mur_tail; \
const uint32_t *_mur_blocks = (const uint32_t*)(_mur_data+_mur_nblocks*4); \
int _mur_i; \
for(_mur_i = -_mur_nblocks; _mur_i; _mur_i++) { \
_mur_k1 = MUR_GETBLOCK(_mur_blocks,_mur_i); \
_mur_k1 *= _mur_c1; \
_mur_k1 = MUR_ROTL32(_mur_k1,15); \
_mur_k1 *= _mur_c2; \
\
_mur_h1 ^= _mur_k1; \
_mur_h1 = MUR_ROTL32(_mur_h1,13); \
_mur_h1 = _mur_h1*5+0xe6546b64; \
} \
_mur_tail = (const uint8_t*)(_mur_data + _mur_nblocks*4); \
_mur_k1=0; \
switch((keylen) & 3) { \
case 3: _mur_k1 ^= _mur_tail[2] << 16; \
case 2: _mur_k1 ^= _mur_tail[1] << 8; \
case 1: _mur_k1 ^= _mur_tail[0]; \
_mur_k1 *= _mur_c1; \
_mur_k1 = MUR_ROTL32(_mur_k1,15); \
_mur_k1 *= _mur_c2; \
_mur_h1 ^= _mur_k1; \
} \
_mur_h1 ^= (keylen); \
MUR_FMIX(_mur_h1); \
hashv = _mur_h1; \
bkt = hashv & (num_bkts-1); \
} while(0)
#endif /* HASH_USING_NO_STRICT_ALIASING */
/* key comparison function; return 0 if keys equal */
#define HASH_KEYCMP(a,b,len) memcmp(a,b,len)
/* iterate over items in a known bucket to find desired item */
#define HASH_FIND_IN_BKT(tbl,hh,head,keyptr,keylen_in,out) \
do { \
if (head.hh_head) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,head.hh_head)); \
else out=NULL; \
while (out) { \
if ((out)->hh.keylen == keylen_in) { \
if ((HASH_KEYCMP((out)->hh.key,keyptr,keylen_in)) == 0) break; \
} \
if ((out)->hh.hh_next) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,(out)->hh.hh_next)); \
else out = NULL; \
} \
} while(0)
/* add an item to a bucket */
#define HASH_ADD_TO_BKT(head,addhh) \
do { \
head.count++; \
(addhh)->hh_next = head.hh_head; \
(addhh)->hh_prev = NULL; \
if (head.hh_head) { (head).hh_head->hh_prev = (addhh); } \
(head).hh_head=addhh; \
if (head.count >= ((head.expand_mult+1) * HASH_BKT_CAPACITY_THRESH) \
&& (addhh)->tbl->noexpand != 1) { \
HASH_EXPAND_BUCKETS((addhh)->tbl); \
} \
} while(0)
/* remove an item from a given bucket */
#define HASH_DEL_IN_BKT(hh,head,hh_del) \
(head).count--; \
if ((head).hh_head == hh_del) { \
(head).hh_head = hh_del->hh_next; \
} \
if (hh_del->hh_prev) { \
hh_del->hh_prev->hh_next = hh_del->hh_next; \
} \
if (hh_del->hh_next) { \
hh_del->hh_next->hh_prev = hh_del->hh_prev; \
}
/* Bucket expansion has the effect of doubling the number of buckets
* and redistributing the items into the new buckets. Ideally the
* items will distribute more or less evenly into the new buckets
* (the extent to which this is true is a measure of the quality of
* the hash function as it applies to the key domain).
*
* With the items distributed into more buckets, the chain length
* (item count) in each bucket is reduced. Thus by expanding buckets
* the hash keeps a bound on the chain length. This bounded chain
* length is the essence of how a hash provides constant time lookup.
*
* The calculation of tbl->ideal_chain_maxlen below deserves some
* explanation. First, keep in mind that we're calculating the ideal
* maximum chain length based on the *new* (doubled) bucket count.
* In fractions this is just n/b (n=number of items,b=new num buckets).
* Since the ideal chain length is an integer, we want to calculate
* ceil(n/b). We don't depend on floating point arithmetic in this
* hash, so to calculate ceil(n/b) with integers we could write
*
* ceil(n/b) = (n/b) + ((n%b)?1:0)
*
* and in fact a previous version of this hash did just that.
* But now we have improved things a bit by recognizing that b is
* always a power of two. We keep its base 2 log handy (call it lb),
* so now we can write this with a bit shift and logical AND:
*
* ceil(n/b) = (n>>lb) + ( (n & (b-1)) ? 1:0)
*
*/
#define HASH_EXPAND_BUCKETS(tbl) \
do { \
unsigned _he_bkt; \
unsigned _he_bkt_i; \
struct UT_hash_handle *_he_thh, *_he_hh_nxt; \
UT_hash_bucket *_he_new_buckets, *_he_newbkt; \
_he_new_buckets = (UT_hash_bucket*)uthash_malloc( \
2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
if (!_he_new_buckets) { uthash_fatal( "out of memory"); } \
memset(_he_new_buckets, 0, \
2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
tbl->ideal_chain_maxlen = \
(tbl->num_items >> (tbl->log2_num_buckets+1)) + \
((tbl->num_items & ((tbl->num_buckets*2)-1)) ? 1 : 0); \
tbl->nonideal_items = 0; \
for(_he_bkt_i = 0; _he_bkt_i < tbl->num_buckets; _he_bkt_i++) \
{ \
_he_thh = tbl->buckets[ _he_bkt_i ].hh_head; \
while (_he_thh) { \
_he_hh_nxt = _he_thh->hh_next; \
HASH_TO_BKT( _he_thh->hashv, tbl->num_buckets*2, _he_bkt); \
_he_newbkt = &(_he_new_buckets[ _he_bkt ]); \
if (++(_he_newbkt->count) > tbl->ideal_chain_maxlen) { \
tbl->nonideal_items++; \
_he_newbkt->expand_mult = _he_newbkt->count / \
tbl->ideal_chain_maxlen; \
} \
_he_thh->hh_prev = NULL; \
_he_thh->hh_next = _he_newbkt->hh_head; \
if (_he_newbkt->hh_head) _he_newbkt->hh_head->hh_prev = \
_he_thh; \
_he_newbkt->hh_head = _he_thh; \
_he_thh = _he_hh_nxt; \
} \
} \
uthash_free( tbl->buckets, tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
tbl->num_buckets *= 2; \
tbl->log2_num_buckets++; \
tbl->buckets = _he_new_buckets; \
tbl->ineff_expands = (tbl->nonideal_items > (tbl->num_items >> 1)) ? \
(tbl->ineff_expands+1) : 0; \
if (tbl->ineff_expands > 1) { \
tbl->noexpand=1; \
uthash_noexpand_fyi(tbl); \
} \
uthash_expand_fyi(tbl); \
} while(0)
/* This is an adaptation of Simon Tatham's O(n log(n)) mergesort */
/* Note that HASH_SORT assumes the hash handle name to be hh.
* HASH_SRT was added to allow the hash handle name to be passed in. */
#define HASH_SORT(head,cmpfcn) HASH_SRT(hh,head,cmpfcn)
#define HASH_SRT(hh,head,cmpfcn) \
do { \
unsigned _hs_i; \
unsigned _hs_looping,_hs_nmerges,_hs_insize,_hs_psize,_hs_qsize; \
struct UT_hash_handle *_hs_p, *_hs_q, *_hs_e, *_hs_list, *_hs_tail; \
if (head) { \
_hs_insize = 1; \
_hs_looping = 1; \
_hs_list = &((head)->hh); \
while (_hs_looping) { \
_hs_p = _hs_list; \
_hs_list = NULL; \
_hs_tail = NULL; \
_hs_nmerges = 0; \
while (_hs_p) { \
_hs_nmerges++; \
_hs_q = _hs_p; \
_hs_psize = 0; \
for ( _hs_i = 0; _hs_i < _hs_insize; _hs_i++ ) { \
_hs_psize++; \
_hs_q = (UT_hash_handle*)((_hs_q->next) ? \
((void*)((char*)(_hs_q->next) + \
(head)->hh.tbl->hho)) : NULL); \
if (! (_hs_q) ) break; \
} \
_hs_qsize = _hs_insize; \
while ((_hs_psize > 0) || ((_hs_qsize > 0) && _hs_q )) { \
if (_hs_psize == 0) { \
_hs_e = _hs_q; \
_hs_q = (UT_hash_handle*)((_hs_q->next) ? \
((void*)((char*)(_hs_q->next) + \
(head)->hh.tbl->hho)) : NULL); \
_hs_qsize--; \
} else if ( (_hs_qsize == 0) || !(_hs_q) ) { \
_hs_e = _hs_p; \
if (_hs_p){ \
_hs_p = (UT_hash_handle*)((_hs_p->next) ? \
((void*)((char*)(_hs_p->next) + \
(head)->hh.tbl->hho)) : NULL); \
} \
_hs_psize--; \
} else if (( \
cmpfcn(DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_p)), \
DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_q))) \
) <= 0) { \
_hs_e = _hs_p; \
if (_hs_p){ \
_hs_p = (UT_hash_handle*)((_hs_p->next) ? \
((void*)((char*)(_hs_p->next) + \
(head)->hh.tbl->hho)) : NULL); \
} \
_hs_psize--; \
} else { \
_hs_e = _hs_q; \
_hs_q = (UT_hash_handle*)((_hs_q->next) ? \
((void*)((char*)(_hs_q->next) + \
(head)->hh.tbl->hho)) : NULL); \
_hs_qsize--; \
} \
if ( _hs_tail ) { \
_hs_tail->next = ((_hs_e) ? \
ELMT_FROM_HH((head)->hh.tbl,_hs_e) : NULL); \
} else { \
_hs_list = _hs_e; \
} \
if (_hs_e) { \
_hs_e->prev = ((_hs_tail) ? \
ELMT_FROM_HH((head)->hh.tbl,_hs_tail) : NULL); \
} \
_hs_tail = _hs_e; \
} \
_hs_p = _hs_q; \
} \
if (_hs_tail){ \
_hs_tail->next = NULL; \
} \
if ( _hs_nmerges <= 1 ) { \
_hs_looping=0; \
(head)->hh.tbl->tail = _hs_tail; \
DECLTYPE_ASSIGN(head,ELMT_FROM_HH((head)->hh.tbl, _hs_list)); \
} \
_hs_insize *= 2; \
} \
HASH_FSCK(hh,head); \
} \
} while (0)
/* This function selects items from one hash into another hash.
* The end result is that the selected items have dual presence
* in both hashes. There is no copy of the items made; rather
* they are added into the new hash through a secondary hash
* hash handle that must be present in the structure. */
#define HASH_SELECT(hh_dst, dst, hh_src, src, cond) \
do { \
unsigned _src_bkt, _dst_bkt; \
void *_last_elt=NULL, *_elt; \
UT_hash_handle *_src_hh, *_dst_hh, *_last_elt_hh=NULL; \
ptrdiff_t _dst_hho = ((char*)(&(dst)->hh_dst) - (char*)(dst)); \
if (src) { \
for(_src_bkt=0; _src_bkt < (src)->hh_src.tbl->num_buckets; _src_bkt++) { \
for(_src_hh = (src)->hh_src.tbl->buckets[_src_bkt].hh_head; \
_src_hh; \
_src_hh = _src_hh->hh_next) { \
_elt = ELMT_FROM_HH((src)->hh_src.tbl, _src_hh); \
if (cond(_elt)) { \
_dst_hh = (UT_hash_handle*)(((char*)_elt) + _dst_hho); \
_dst_hh->key = _src_hh->key; \
_dst_hh->keylen = _src_hh->keylen; \
_dst_hh->hashv = _src_hh->hashv; \
_dst_hh->prev = _last_elt; \
_dst_hh->next = NULL; \
if (_last_elt_hh) { _last_elt_hh->next = _elt; } \
if (!dst) { \
DECLTYPE_ASSIGN(dst,_elt); \
HASH_MAKE_TABLE(hh_dst,dst); \
} else { \
_dst_hh->tbl = (dst)->hh_dst.tbl; \
} \
HASH_TO_BKT(_dst_hh->hashv, _dst_hh->tbl->num_buckets, _dst_bkt); \
HASH_ADD_TO_BKT(_dst_hh->tbl->buckets[_dst_bkt],_dst_hh); \
(dst)->hh_dst.tbl->num_items++; \
_last_elt = _elt; \
_last_elt_hh = _dst_hh; \
} \
} \
} \
} \
HASH_FSCK(hh_dst,dst); \
} while (0)
#define HASH_CLEAR(hh,head) \
do { \
if (head) { \
uthash_free((head)->hh.tbl->buckets, \
(head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket)); \
HASH_BLOOM_FREE((head)->hh.tbl); \
uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \
(head)=NULL; \
} \
} while(0)
#define HASH_OVERHEAD(hh,head) \
(size_t)((((head)->hh.tbl->num_items * sizeof(UT_hash_handle)) + \
((head)->hh.tbl->num_buckets * sizeof(UT_hash_bucket)) + \
(sizeof(UT_hash_table)) + \
(HASH_BLOOM_BYTELEN)))
#ifdef NO_DECLTYPE
#define HASH_ITER(hh,head,el,tmp) \
for((el)=(head), (*(char**)(&(tmp)))=(char*)((head)?(head)->hh.next:NULL); \
el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL))
#else
#define HASH_ITER(hh,head,el,tmp) \
for((el)=(head),(tmp)=DECLTYPE(el)((head)?(head)->hh.next:NULL); \
el; (el)=(tmp),(tmp)=DECLTYPE(el)((tmp)?(tmp)->hh.next:NULL))
#endif
/* obtain a count of items in the hash */
#define HASH_COUNT(head) HASH_CNT(hh,head)
#define HASH_CNT(hh,head) ((head)?((head)->hh.tbl->num_items):0)
typedef struct UT_hash_bucket {
struct UT_hash_handle *hh_head;
unsigned count;
/* expand_mult is normally set to 0. In this situation, the max chain length
* threshold is enforced at its default value, HASH_BKT_CAPACITY_THRESH. (If
* the bucket's chain exceeds this length, bucket expansion is triggered).
* However, setting expand_mult to a non-zero value delays bucket expansion
* (that would be triggered by additions to this particular bucket)
* until its chain length reaches a *multiple* of HASH_BKT_CAPACITY_THRESH.
* (The multiplier is simply expand_mult+1). The whole idea of this
* multiplier is to reduce bucket expansions, since they are expensive, in
* situations where we know that a particular bucket tends to be overused.
* It is better to let its chain length grow to a longer yet-still-bounded
* value, than to do an O(n) bucket expansion too often.
*/
unsigned expand_mult;
} UT_hash_bucket;
/* random signature used only to find hash tables in external analysis */
#define HASH_SIGNATURE 0xa0111fe1
#define HASH_BLOOM_SIGNATURE 0xb12220f2
typedef struct UT_hash_table {
UT_hash_bucket *buckets;
unsigned num_buckets, log2_num_buckets;
unsigned num_items;
struct UT_hash_handle *tail; /* tail hh in app order, for fast append */
ptrdiff_t hho; /* hash handle offset (byte pos of hash handle in element */
/* in an ideal situation (all buckets used equally), no bucket would have
* more than ceil(#items/#buckets) items. that's the ideal chain length. */
unsigned ideal_chain_maxlen;
/* nonideal_items is the number of items in the hash whose chain position
* exceeds the ideal chain maxlen. these items pay the penalty for an uneven
* hash distribution; reaching them in a chain traversal takes >ideal steps */
unsigned nonideal_items;
/* ineffective expands occur when a bucket doubling was performed, but
* afterward, more than half the items in the hash had nonideal chain
* positions. If this happens on two consecutive expansions we inhibit any
* further expansion, as it's not helping; this happens when the hash
* function isn't a good fit for the key domain. When expansion is inhibited
* the hash will still work, albeit no longer in constant time. */
unsigned ineff_expands, noexpand;
uint32_t signature; /* used only to find hash tables in external analysis */
#ifdef HASH_BLOOM
uint32_t bloom_sig; /* used only to test bloom exists in external analysis */
uint8_t *bloom_bv;
char bloom_nbits;
#endif
} UT_hash_table;
typedef struct UT_hash_handle {
struct UT_hash_table *tbl;
void *prev; /* prev element in app order */
void *next; /* next element in app order */
struct UT_hash_handle *hh_prev; /* previous hh in bucket order */
struct UT_hash_handle *hh_next; /* next hh in bucket order */
void *key; /* ptr to enclosing struct's key */
unsigned keylen; /* enclosing struct's key len */
unsigned hashv; /* result of hash-fcn(key) */
} UT_hash_handle;
#endif /* UTHASH_H */