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Michael Brown
2005-05-17 16:44:57 +00:00
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
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These restrictions translate to certain responsibilities for you if you
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you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
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NO WARRANTY
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OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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END OF TERMS AND CONDITIONS
Appendix: How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
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to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
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 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
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
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Gnomovision version 69, Copyright (C) 19yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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contrib/mini-slamd/Makefile Normal file
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CC=gcc
CFLAGS=-Wall -O2
mini-slamd: mini-slamd.c
$(CC) $(CFLAGS) -o $@ $<
clean:
rm -f mini-slamd

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contrib/mini-slamd/mini-slamd.c Normal file
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/*
* mini-slamd
* (c) 2002 Eric Biederman
*/
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
/*
* To specify the default interface for multicast packets use:
* route add -net 224.0.0.0 netmask 240.0.0.0 dev eth1
* This server is stupid and does not override the default.
*/
/* Sever states.
*
* Waiting for clients.
* Sending data to clients.
* Pinging clients for data.
*
*/
#define SLAM_PORT 10000
#define SLAM_MULTICAST_IP ((239<<24)|(255<<16)|(1<<8)|(1<<0))
#define SLAM_MULTICAST_PORT 10000
#define SLAM_MULTICAST_TTL 1
#define SLAM_MULTICAST_LOOPBACK 1
#define SLAM_MAX_CLIENTS 10
#define SLAM_PING_TIMEOUT 100 /* ms */
/*** Packets Formats ***
* Data Packet:
* transaction
* total bytes
* block size
* packet #
* data
*
* Status Request Packet
* transaction
* total bytes
* block packets
*
* Status Packet
* received packets
* requested packets
* received packets
* requested packets
* ...
* received packets
* requested packtes
* 0
*/
#define MAX_HDR (7 + 7 + 7) /* transaction, total size, block size */
#define MIN_HDR (1 + 1 + 1) /* transaction, total size, block size */
#define MAX_DATA_HDR (MAX_HDR + 7) /* header, packet # */
#define MIN_DATA_HDR (MAX_HDR + 1) /* header, packet # */
/* ETH_MAX_MTU 1500 - sizeof(iphdr) 20 - sizeof(udphdr) 8 = 1472 */
#define SLAM_MAX_NACK (1500 - (20 + 8))
/* ETH_MAX_MTU 1500 - sizeof(iphdr) 20 - sizeof(udphdr) 8 - MAX_HDR = 1451 */
#define SLAM_BLOCK_SIZE (1500 - (20 + 8 + MAX_HDR))
/* Define how many debug messages you want
* 1 - sparse but useful
* 2 - everything
*/
#ifndef DEBUG
#define DEBUG 0
#endif
static int slam_encode(
unsigned char **ptr, unsigned char *end, unsigned long value)
{
unsigned char *data = *ptr;
int bytes;
bytes = sizeof(value);
while ((bytes > 0) && ((0xff & (value >> ((bytes -1)<<3))) == 0)) {
bytes--;
}
if (bytes <= 0) {
bytes = 1;
}
if (data + bytes >= end) {
return -1;
}
if ((0xe0 & (value >> ((bytes -1)<<3))) == 0) {
/* packed together */
*data = (bytes << 5) | (value >> ((bytes -1)<<3));
} else {
bytes++;
*data = (bytes << 5);
}
bytes--;
data++;
while(bytes) {
*(data++) = 0xff & (value >> ((bytes -1)<<3));
bytes--;
}
*ptr = data;
return 0;
}
static unsigned long slam_decode(unsigned char **ptr, unsigned char *end, int *err)
{
unsigned long value;
unsigned bytes;
if (*ptr >= end) {
*err = -1;
}
bytes = ((**ptr) >> 5) & 7;
if ((bytes == 0) || (bytes > sizeof(unsigned long))) {
*err = -1;
return 0;
}
if ((*ptr) + bytes >= end) {
*err = -1;
}
value = (**ptr) & 0x1f;
bytes--;
(*ptr)++;
while(bytes) {
value <<= 8;
value |= **ptr;
(*ptr)++;
bytes--;
}
return value;
}
static struct sockaddr_in client[SLAM_MAX_CLIENTS];
static int clients;
void del_client(struct sockaddr_in *old)
{
int i;
for(i = 0; i < clients; i++) {
if ((client[i].sin_family == old->sin_family) &&
(client[i].sin_addr.s_addr == old->sin_addr.s_addr) &&
(client[i].sin_port == old->sin_port)) {
memmove(&client[i], &client[i+1],
(clients - (i+1))*sizeof(client[0]));
clients--;
}
}
}
void add_client(struct sockaddr_in *new)
{
del_client(new);
if (clients >= SLAM_MAX_CLIENTS)
return;
memcpy(&client[clients], new, sizeof(*new));
clients++;
}
void push_client(struct sockaddr_in *new)
{
del_client(new);
if (clients >= SLAM_MAX_CLIENTS) {
clients--;
}
memmove(&client[1], &client[0], clients*sizeof(*new));
memcpy(&client[0], new, sizeof(*new));
clients++;
}
void next_client(struct sockaddr_in *next)
{
/* Find the next client we want to ping next */
if (!clients) {
next->sin_family = AF_UNSPEC;
return;
}
/* Return the first client */
memcpy(next, &client[0], sizeof(*next));
}
int main(int argc, char **argv)
{
char *filename;
uint8_t nack_packet[SLAM_MAX_NACK];
int nack_len;
uint8_t request_packet[MAX_HDR];
int request_len;
uint8_t data_packet[MAX_DATA_HDR + SLAM_BLOCK_SIZE];
int data_len;
uint8_t *ptr, *end;
struct sockaddr_in master_client;
struct sockaddr_in sa_src;
struct sockaddr_in sa_mcast;
uint8_t mcast_ttl;
uint8_t mcast_loop;
int sockfd, filefd;
int result;
struct pollfd fds[1];
int state;
#define STATE_PINGING 1
#define STATE_WAITING 2
#define STATE_RECEIVING 3
#define STATE_TRANSMITTING 4
off_t size;
struct stat st;
uint64_t transaction;
unsigned long packet;
unsigned long packet_count;
unsigned slam_port, slam_multicast_port;
struct in_addr slam_multicast_ip;
slam_port = SLAM_PORT;
slam_multicast_port = SLAM_MULTICAST_PORT;
slam_multicast_ip.s_addr = htonl(SLAM_MULTICAST_IP);
if (argc != 2) {
fprintf(stderr, "Bad argument count\n");
fprintf(stderr, "Usage: mini-slamd filename\n");
exit(EXIT_FAILURE);
}
filename = argv[1];
filefd = -1;
size = 0;
transaction = 0;
/* Setup the udp socket */
sockfd = socket(PF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
fprintf(stderr, "Cannot create socket\n");
exit(EXIT_FAILURE);
}
memset(&sa_src, 0, sizeof(sa_src));
sa_src.sin_family = AF_INET;
sa_src.sin_port = htons(slam_port);
sa_src.sin_addr.s_addr = INADDR_ANY;
result = bind(sockfd, &sa_src, sizeof(sa_src));
if (result < 0) {
fprintf(stderr, "Cannot bind socket to port %d\n",
ntohs(sa_src.sin_port));
exit(EXIT_FAILURE);
}
/* Setup the multicast transmission address */
memset(&sa_mcast, 0, sizeof(sa_mcast));
sa_mcast.sin_family = AF_INET;
sa_mcast.sin_port = htons(slam_multicast_port);
sa_mcast.sin_addr.s_addr = slam_multicast_ip.s_addr;
if (!IN_MULTICAST(ntohl(sa_mcast.sin_addr.s_addr))) {
fprintf(stderr, "Not a multicast ip\n");
exit(EXIT_FAILURE);
}
/* Set the multicast ttl */
mcast_ttl = SLAM_MULTICAST_TTL;
setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL,
&mcast_ttl, sizeof(mcast_ttl));
/* Set the multicast loopback status */
mcast_loop = SLAM_MULTICAST_LOOPBACK;
setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &mcast_loop, sizeof(mcast_loop));
state = STATE_WAITING;
packet = 0;
packet_count = 0;
fds[0].fd = sockfd;
fds[0].events = POLLIN;
fds[0].revents = 0;
for(;;) {
switch(state) {
case STATE_PINGING:
state = STATE_WAITING;
next_client(&master_client);
if (master_client.sin_family == AF_UNSPEC) {
break;
}
#if DEBUG
printf("Pinging %s:%d\n",
inet_ntoa(master_client.sin_addr),
ntohs(master_client.sin_port));
fflush(stdout);
#endif
/* Prepare the request packet, it is all header */
ptr = request_packet;
end = &request_packet[sizeof(request_packet) -1];
slam_encode(&ptr, end, transaction);
slam_encode(&ptr, end, size);
slam_encode(&ptr, end, SLAM_BLOCK_SIZE);
request_len = ptr - request_packet;
result = sendto(sockfd, request_packet, request_len, 0,
&master_client, sizeof(master_client));
/* Forget the client I just asked, when the reply
* comes in we will remember it again.
*/
del_client(&master_client);
break;
case STATE_WAITING:
{
int timeout;
int from_len;
timeout = -1;
if (master_client.sin_family != AF_UNSPEC) {
timeout = SLAM_PING_TIMEOUT;
}
result = poll(fds, sizeof(fds)/sizeof(fds[0]), timeout);
if (result == 0) {
/* On a timeout try the next client */
state = STATE_PINGING;
break;
}
if (result > 0) {
from_len = sizeof(master_client);
result = recvfrom(sockfd,
nack_packet, sizeof(nack_packet), 0,
&master_client, &from_len);
if (result < 0)
break;
nack_len = result;
#if DEBUG
printf("Received Nack from %s:%d\n",
inet_ntoa(master_client.sin_addr),
ntohs(master_client.sin_port));
fflush(stdout);
#endif
#if DEBUG
{
ptr = nack_packet;
end = ptr + result;
packet = 0;
result = 0;
while(ptr < end) {
packet += slam_decode(&ptr, end, &result);
if (result < 0) break;
packet_count = slam_decode(&ptr, end, &result);
if (result < 0) break;
printf("%d-%d ",
packet, packet + packet_count -1);
}
printf("\n");
fflush(stdout);
}
#endif
/* Forget this client temporarily.
* If the packet appears good they will be
* readded.
*/
del_client(&master_client);
ptr = nack_packet;
end = ptr + nack_len;
result = 0;
packet = slam_decode(&ptr, end, &result);
if (result < 0)
break;
packet_count = slam_decode(&ptr, end, &result);
if (result < 0)
break;
/* We appear to have a good packet, keep
* this client.
*/
push_client(&master_client);
/* Reopen the file to transmit */
if (filefd != -1) {
close(filefd);
}
filefd = open(filename, O_RDONLY);
if (filefd < 0) {
fprintf(stderr, "Cannot open %s: %s\n",
filename, strerror(errno));
break;
}
size = lseek(filefd, 0, SEEK_END);
if (size < 0) {
fprintf(stderr, "Seek failed on %s: %s\n",
filename, strerror(errno));
break;
}
result = fstat(filefd, &st);
if (result < 0) {
fprintf(stderr, "Stat failed on %s: %s\n",
filename, strerror(errno));
break;
}
transaction = st.st_mtime;
state = STATE_TRANSMITTING;
break;
}
break;
}
case STATE_RECEIVING:
/* Now clear the queue of received packets */
{
struct sockaddr_in from;
int from_len;
uint8_t dummy_packet[SLAM_MAX_NACK];
state = STATE_TRANSMITTING;
result = poll(fds, sizeof(fds)/sizeof(fds[0]), 0);
if (result < 1)
break;
from_len = sizeof(from);
result = recvfrom(sockfd,
dummy_packet, sizeof(dummy_packet), 0,
&from, &from_len);
if (result <= 0)
break;
#if DEBUG
printf("Received Nack from %s:%d\n",
inet_ntoa(from.sin_addr),
ntohs(from.sin_port));
fflush(stdout);
#endif
/* Receive packets until I don't get any more */
state = STATE_RECEIVING;
/* Process a packet */
if (dummy_packet[0] == '\0') {
/* If the first byte is null it is a disconnect
* packet.
*/
del_client(&from);
}
else {
/* Otherwise attempt to add the client. */
add_client(&from);
}
break;
}
case STATE_TRANSMITTING:
{
off_t off;
off_t offset;
ssize_t bytes;
uint8_t *ptr2, *end2;
/* After I transmit a packet check for packets to receive. */
state = STATE_RECEIVING;
/* Find the packet to transmit */
offset = packet * SLAM_BLOCK_SIZE;
/* Seek to the desired packet */
off = lseek(filefd, offset, SEEK_SET);
if ((off < 0) || (off != offset)) {
fprintf(stderr, "Seek failed on %s:%s\n",
filename, strerror(errno));
break;
}
/* Encode the packet header */
ptr2 = data_packet;
end2 = data_packet + sizeof(data_packet);
slam_encode(&ptr2, end2, transaction);
slam_encode(&ptr2, end2, size);
slam_encode(&ptr2, end2, SLAM_BLOCK_SIZE);
slam_encode(&ptr2, end2, packet);
data_len = ptr2 - data_packet;
/* Read in the data */
bytes = read(filefd, &data_packet[data_len],
SLAM_BLOCK_SIZE);
if (bytes <= 0) {
fprintf(stderr, "Read failed on %s:%s\n",
filename, strerror(errno));
break;
}
data_len += bytes;
/* Write out the data */
result = sendto(sockfd, data_packet, data_len, 0,
&sa_mcast, sizeof(sa_mcast));
if (result != data_len) {
fprintf(stderr, "Send failed %s\n",
strerror(errno));
break;
}
#if DEBUG > 1
printf("Transmitted: %d\n", packet);
fflush(stdout);
#endif
/* Compute the next packet */
packet++;
packet_count--;
if (packet_count == 0) {
packet += slam_decode(&ptr, end, &result);
if (result >= 0)
packet_count = slam_decode(&ptr, end, &result);
if (result < 0) {
/* When a transmission is done close the file,
* so it may be updated. And then ping then start
* pinging clients to get the transmission started
* again.
*/
state = STATE_PINGING;
close(filefd);
filefd = -1;
break;
}
}
break;
}
}
}
return EXIT_SUCCESS;
}