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Working on that server again, Now it does more stuff, er, more address getting. ~Cherish

This commit is contained in:
Cherish A. Franco 2011-10-11 15:54:52 -06:00
parent 8567bd04ee
commit 9e8968bbdd
1 changed files with 147 additions and 49 deletions
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138
packages/multicaster/src/multicaster-server.c
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@ -3,13 +3,15 @@
* found at http://cboard.cprogramming.com/showthread.php?t=67469
*/
#include <stdio.h> /* for fprintf() */
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h> /* for atoi() and exit() */
#include <unistd.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)
{
@ -19,15 +21,15 @@ static void DieWithError(const char* errorMessage)
int main(int argc, char *argv[])
{
int sock; /* Socket */
int sender, listener; /* Sockets */
char* multicastIP; /* Arg: IP Multicast address */
char* multicastPort; /* Arg: Server port */
char* sendString; /* Arg: String to multicast */
size_t sendStringLen; /* Length of string to multicast */
char* token;
size_t tokenlen;
struct addrinfo * multicastAddr; /* Multicast address */
struct addrinfo hints = { 0 }; /* Hints for name lookup */
if ( argc != 4 )
if (argc != 4)
{
fprintf(stderr, "Usage: %s <Multicast Address> <Port> <Send String>\n", argv[0]);
exit(10);
@ -35,37 +37,133 @@ int main(int argc, char *argv[])
multicastIP = argv[1]; /* First arg: multicast IP address */
multicastPort = argv[2]; /* Second arg: multicast port */
sendString = argv[3]; /* Third arg: String to multicast */
sendStringLen = strlen(sendString); /* Find length of sendString */
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");
if (getaddrinfo(multicastIP, multicastPort, &hints, &multicastAddr) != 0)
{
DieWithError("getaddrinfo() failed");
}
/* Create socket for sending multicast datagrams */
if ((sock = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1) DieWithError("socket() failed");
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(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0) DieWithError("setsockopt(MULTICAST_HOPS) failed");
if (setsockopt(sender, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0)
{
DieWithError("setsockopt(MULTICAST_HOPS) 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 sendLen = sendto(sock, sendString, sendStringLen, 0, multicastAddr->ai_addr, multicastAddr->ai_addrlen);
if (sendLen == sendStringLen )
int n;
int max_fd;
struct timeval timeout;
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;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
n = select(max_fd, &input, NULL, NULL, &timeout);
/* See if there was an error */
if (n < 0)
{
printf("Sent [%s] (%i bytes) to %s, port %s\n", sendString, sendLen, multicastIP, multicastPort);
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");
}
else
recvString[recvStringLen] = '\0';
if (strcmp(recvString, "hello")==0)
{
printf("Correct!!\n");
sendto(listener, token, sizeof(sendString), 0, (struct sockaddr *)&from, fromlen);
} else {
sendto(listener, errorString, sizeof(errorString), 0, (struct sockaddr *)&from, fromlen);
}
/* Print the received string */
printf("Received string [%s]\n", recvString);
}
}
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");
}
sleep(1); /* Multicast sendString in datagram to clients every second */
}
/* NOT REACHED */
freeaddrinfo(multicastAddr);
close(sock);
close(sender);
close(listener);
return 0;
}