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add multicaster, verify token junk

This commit is contained in:
Neale Pickett 2011-10-13 21:15:11 -06:00
parent bbb18cdb62
commit fcc3f90dba
6 changed files with 186 additions and 180 deletions
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16
packages/mcp/service/pointsd/run
View File

@ -9,11 +9,25 @@ touch /etc/group /etc/passwd
addgroup -g 56634 nogroup || true
adduser -D -S -h /var/lib/ctf -H ctf || true
# Set up base directories
NEWDIR=/var/lib/ctf/points.new
install -d /var/www
install -d /var/lib/ctf
install -o ctf -m 0755 -d $NEWDIR
install -o ctf -m 0755 -d /var/lib/ctf/points.tmp
# Make tokens database now, this is as good a time as any
TOKENS=/var/lib/ctf/tokens.db
for fn in $TOKENS /opt/*/tokens.txt; do
[ -f "$fn" ] || continue
cat $fn
done | sort | uniq > $TOKENS.new
mv $TOKENS.new $TOKENS
# Create some files
CLAIM=/var/lib/ctf/claim.db
touch $CLAIM
chown ctf $CLAIM
touch /var/lib/ctf/points.log
# Generate preliminary scoreboard

1
packages/mcp/www/index.html
View File

@ -46,6 +46,7 @@
No DoS attacks.
</li>
<li>
Contest servers lie within <samp>fd84:b410:3441::/112</samp>.
Do not attack machines outside <samp>fd84:b410:3441::/48</samp>.
Low ports (under 1024) do not run contest categories, don't
waste your time.

3
packages/multicaster/multicaster.mk
View File

@ -2,6 +2,9 @@ MULTICASTER_PKGDIR = $(TARGET)/multicaster
multicaster-install: multicaster-build
mkdir -p $(MULTICASTER_PKGDIR)
cp packages/multicaster/tokens.txt $(MULTICASTER_PKGDIR)
$(call COPYTREE, packages/multicaster/service, $(MULTICASTER_PKGDIR)/service)
mkdir -p $(MULTICASTER_PKGDIR)/bin/
$(MAKE) -C packages/multicaster/src install DESTDIR=$(CURDIR)/$(MULTICASTER_PKGDIR)

2
packages/multicaster/src/Makefile
View File

@ -1,5 +1,5 @@
CFLAGS = -Wall -Werror
TARGETS = multicaster-server multicaster-client
TARGETS = multicaster
all: build
build: $(TARGETS)

178
packages/multicaster/src/multicaster-serverAWESOME.c
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@ -1,178 +0,0 @@
/* multicast_server.c
* Adapted from tmouse's IPv6 client/server example code
* found at http://cboard.cprogramming.com/showthread.php?t=67469
*/
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
static void DieWithError(const char* errorMessage)
{
fprintf(stderr, "%s\n", errorMessage);
exit(1);
}
int main(int argc, char *argv[])
{
int sender, listener; /* Sockets */
char* multicastIP; /* Arg: IP Multicast address */
char* multicastPort; /* Arg: Server port */
char* token;
size_t tokenlen;
struct addrinfo * multicastAddr; /* Multicast address */
struct addrinfo hints = { 0 }; /* Hints for name lookup */
struct timeval timeout = { 0 };
if (argc != 4)
{
fprintf(stderr, "Usage: %s <Multicast Address> <Port> <Send String>\n", argv[0]);
exit(1);
}
multicastIP = argv[1]; /* First arg: multicast IP address */
multicastPort = argv[2]; /* Second arg: multicast port */
token = argv[3];
tokenlen = strlen(token);
/* Resolve destination address for multicast datagrams */
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(multicastIP, multicastPort, &hints, &multicastAddr) != 0)
{
DieWithError("getaddrinfo() failed");
}
/* Create socket for sending multicast datagrams */
if ((sender = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1)
{
DieWithError("socket() failed");
}
/* Create socket for recieving multicast datagrams */
if ((listener = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1)
{
DieWithError("socket() failed");
}
{
int hops = 5;
if (setsockopt(sender, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0)
{
DieWithError("setsockopt(MULTICAST_HOPS) failed");
}
}
/* Bind to the multicast port */
if (bind(listener, multicastAddr->ai_addr, multicastAddr->ai_addrlen) != 0)
{
DieWithError("bind() failed");
}
/* Join the multicast group. */
if ((multicastAddr->ai_family == PF_INET6)&&(multicastAddr->ai_addrlen == sizeof(struct sockaddr_in6)))
{
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(multicastAddr->ai_addr);
struct ipv6_mreq multicastRequest; /* Multicast address join structure */
/* Specify the multicast group */
memcpy(&multicastRequest.ipv6mr_multiaddr, &(addr)->sin6_addr, sizeof(multicastRequest.ipv6mr_multiaddr));
/* Accept multicast from any interface */
multicastRequest.ipv6mr_interface = addr->sin6_scope_id;
/* Join the multicast address */
if (setsockopt(listener, IPPROTO_IPV6, IPV6_JOIN_GROUP, (char*) &multicastRequest, sizeof(multicastRequest)) != 0)
{
DieWithError("setsockopt(IPV6_JOIN_GROUP) failed");
}
} else {
DieWithError("Not IPv6");
}
for (;;) /* Run forever */
{
int n;
int max_fd;
fd_set input;
char recvString[500]; /* Buffer for received string */
int recvStringLen; /* Length of received string */
char sendString[] = "Say Hello\n";
size_t sendStringLen = sizeof(sendString)-1;
char errorString[] = "That is not correct! Try again!\n";
struct sockaddr_in6 from;
socklen_t fromlen = sizeof(from);
FD_ZERO(&input);
FD_SET(listener, &input);
max_fd = listener + 1;
if (timeout.tv_usec < 100)
{
timeout.tv_sec = 1;
timeout.tv_usec = 0;
int sendLen = sendto(sender, sendString, sendStringLen, 0, multicastAddr->ai_addr,
multicastAddr->ai_addrlen);
if (sendLen == sendStringLen)
{
printf("Sent [%s] (%i bytes) to %s, port %s\n", sendString, sendLen,
multicastIP, multicastPort);
} else {
DieWithError("sendto() sent a different number of bytes than expected");
}
}
n = select(max_fd, &input, NULL, NULL, &timeout);
/* See if there was an error */
if (n < 0)
{
perror("select failed");
} else if (n == 0) {
puts("TIMEOUT");
} else {
if (FD_ISSET(listener, &input))
{
recvStringLen = recvfrom(listener, recvString, sizeof(recvString) - 1, 0,
(struct sockaddr *)&from, &fromlen);
/* Receive a single datagram from the server */
if (recvStringLen < 0)
{
DieWithError("recvfrom() failed");
}
recvString[recvStringLen] = '\0';
if (strcmp(recvString, "hello")==0)
{
printf("Correct!!\n");
sendto(listener, token, sizeof(sendString), 0, (struct sockaddr *)&from, fromlen);
} else if (strcmp(recvString, sendString)!=0) {
sendto(listener, errorString, sizeof(errorString), 0, (struct sockaddr *)&from, fromlen);
}
/* Print the received string */
printf("Received string [%s]\n", recvString);
}
}
}
/* NOT REACHED */
freeaddrinfo(multicastAddr);
close(sender);
close(listener);
return 0;
}

166
packages/multicaster/src/multicaster.c Normal file
View File

@ -0,0 +1,166 @@
/* multicast_server.c
* Adapted from tmouse's IPv6 client/server example code
* found at http://cboard.cprogramming.com/showthread.php?t=67469
*/
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
static void
DieWithError(const char* errorMessage)
{
fprintf(stderr, "%s\n", errorMessage);
exit(1);
}
int
main(int argc, char *argv[])
{
int sender, listener; /* Sockets */
char* multicastIP; /* Arg: IP Multicast address */
char* multicastPort; /* Arg: Server port */
char token[100];
size_t tokenlen;
struct addrinfo * multicastAddr; /* Multicast address */
struct addrinfo hints = { 0 }; /* Hints for name lookup */
struct timeval timeout = { 0 };
if (argc != 3)
{
fprintf(stderr, "Usage: %s ADDRESS PORT <TOKENFILE\n", argv[0]);
exit(1);
}
multicastIP = argv[1]; /* First arg: multicast IP address */
multicastPort = argv[2]; /* Second arg: multicast port */
if (NULL == fgets(token, sizeof(token), stdin)) {
DieWithError("Unable to read token");
}
tokenlen = strlen(token);
/* Resolve destination address for multicast datagrams */
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(multicastIP, multicastPort, &hints, &multicastAddr) != 0) {
DieWithError("getaddrinfo() failed");
}
if (! ((multicastAddr->ai_family == PF_INET6) &&
(multicastAddr->ai_addrlen == sizeof(struct sockaddr_in6)))) {
DieWithError("Not IPv6");
}
/* Create socket for sending multicast datagrams */
if ((sender = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1) {
DieWithError("socket() failed");
}
/* Create socket for recieving multicast datagrams */
if ((listener = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1) {
DieWithError("socket() failed");
}
/* We need to go through a router, set hops to 5 */
{
int hops = 5;
if (setsockopt(sender, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0) {
DieWithError("setsockopt(MULTICAST_HOPS) failed");
}
}
/* Bind to the multicast port */
if (bind(listener, multicastAddr->ai_addr, multicastAddr->ai_addrlen) != 0) {
DieWithError("bind() failed");
}
/* Join the multicast group. */
{
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(multicastAddr->ai_addr);
struct ipv6_mreq multicastRequest;
multicastRequest.ipv6mr_interface = addr->sin6_scope_id;
memcpy(&multicastRequest.ipv6mr_multiaddr, &(addr->sin6_addr),
sizeof(multicastRequest.ipv6mr_multiaddr));
if (setsockopt(listener, IPPROTO_IPV6, IPV6_JOIN_GROUP,
(char*)&multicastRequest, sizeof(multicastRequest)) != 0) {
DieWithError("setsockopt(IPV6_JOIN_GROUP) failed");
}
}
for (;;) { /* Run forever */
int n;
int max_fd;
fd_set input;
char recvString[500]; /* Buffer for received string */
int recvStringLen; /* Length of received string */
char sendString[] = "If anyone is out there, please say hello\n";
size_t sendStringLen = sizeof(sendString)-1;
char errorString[] = "Say what?\n";
struct sockaddr_in6 from;
socklen_t fromlen = sizeof(from);
FD_ZERO(&input);
FD_SET(listener, &input);
max_fd = listener + 1;
if (timeout.tv_usec < 100) {
ssize_t sendLen;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
sendLen = sendto(sender, sendString, sendStringLen, 0, multicastAddr->ai_addr,
multicastAddr->ai_addrlen);
if (sendLen != sendStringLen) {
DieWithError("sendto() sent a different number of bytes than expected");
}
}
n = select(max_fd, &input, NULL, NULL, &timeout);
/* See if there was an error */
if (n < 0) {
perror("select failed");
} else if (FD_ISSET(listener, &input)) {
recvStringLen = recvfrom(listener, recvString, sizeof(recvString) - 1, 0,
(struct sockaddr *)&from, &fromlen);
/* Receive a single datagram from the server */
if (recvStringLen < 0) {
DieWithError("recvfrom() failed");
}
recvString[recvStringLen] = '\0';
if (strcmp(recvString, "hello")==0) {
sendto(listener, token, sizeof(sendString), 0, (struct sockaddr *)&from,
fromlen);
} else if (strcmp(recvString, sendString)!=0) {
sendto(listener, errorString, sizeof(errorString), 0,
(struct sockaddr *)&from, fromlen);
}
}
}
/* NOT REACHED */
freeaddrinfo(multicastAddr);
close(sender);
close(listener);
return 0;
}