mirror of https://github.com/dirtbags/moth.git
Working on that server again, Now it does more stuff, er, more address getting. ~Cherish
This commit is contained in:
Cherish A. Franco
parent
d76aad9e9e
commit
22bd672960
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@ -3,69 +3,167 @@
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* found at http://cboard.cprogramming.com/showthread.php?t=67469
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* found at http://cboard.cprogramming.com/showthread.php?t=67469
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*/
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*/
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#include <stdio.h> /* for fprintf() */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netdb.h>
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#include <stdlib.h> /* for atoi() and exit() */
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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static void DieWithError(const char* errorMessage)
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static void DieWithError(const char* errorMessage)
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{
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{
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fprintf(stderr, "%s\n", errorMessage);
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fprintf(stderr, "%s\n", errorMessage);
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exit(10);
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exit(10);
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}
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}
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int main(int argc, char *argv[])
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int main(int argc, char *argv[])
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{
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{
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int sock; /* Socket */
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int sender, listener; /* Sockets */
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char* multicastIP; /* Arg: IP Multicast address */
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char* multicastIP; /* Arg: IP Multicast address */
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char* multicastPort; /* Arg: Server port */
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char* multicastPort; /* Arg: Server port */
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char* sendString; /* Arg: String to multicast */
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char* token;
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size_t sendStringLen; /* Length of string to multicast */
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size_t tokenlen;
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struct addrinfo * multicastAddr; /* Multicast address */
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struct addrinfo * multicastAddr; /* Multicast address */
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struct addrinfo hints = { 0 }; /* Hints for name lookup */
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struct addrinfo hints = { 0 }; /* Hints for name lookup */
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if ( argc != 4 )
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if (argc != 4)
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{
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{
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fprintf(stderr, "Usage: %s <Multicast Address> <Port> <Send String>\n", argv[0]);
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fprintf(stderr, "Usage: %s <Multicast Address> <Port> <Send String>\n", argv[0]);
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exit(10);
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exit(10);
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}
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}
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multicastIP = argv[1]; /* First arg: multicast IP address */
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multicastIP = argv[1]; /* First arg: multicast IP address */
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multicastPort = argv[2]; /* Second arg: multicast port */
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multicastPort = argv[2]; /* Second arg: multicast port */
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sendString = argv[3]; /* Third arg: String to multicast */
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token = argv[3];
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sendStringLen = strlen(sendString); /* Find length of sendString */
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tokenlen = strlen(token);
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/* Resolve destination address for multicast datagrams */
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/* Resolve destination address for multicast datagrams */
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hints.ai_family = PF_INET6;
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hints.ai_family = PF_INET6;
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_flags = AI_NUMERICHOST;
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hints.ai_flags = AI_NUMERICHOST;
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if (getaddrinfo(multicastIP, multicastPort, &hints, &multicastAddr) != 0) DieWithError("getaddrinfo() failed");
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/* Create socket for sending multicast datagrams */
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if (getaddrinfo(multicastIP, multicastPort, &hints, &multicastAddr) != 0)
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if ((sock = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1) DieWithError("socket() failed");
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{
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DieWithError("getaddrinfo() failed");
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}
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int hops = 5;
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/* Create socket for sending multicast datagrams */
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0) DieWithError("setsockopt(MULTICAST_HOPS) failed");
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if ((sender = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1)
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{
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DieWithError("socket() failed");
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}
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for (;;) /* Run forever */
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/* Create socket for recieving multicast datagrams */
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{
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if ((listener = socket(multicastAddr->ai_family, multicastAddr->ai_socktype, 0)) == -1)
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int sendLen = sendto(sock, sendString, sendStringLen, 0, multicastAddr->ai_addr, multicastAddr->ai_addrlen);
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{
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if (sendLen == sendStringLen )
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DieWithError("socket() failed");
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{
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}
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printf("Sent [%s] (%i bytes) to %s, port %s\n", sendString, sendLen, multicastIP, multicastPort);
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}
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else
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{
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DieWithError("sendto() sent a different number of bytes than expected");
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}
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sleep(1); /* Multicast sendString in datagram to clients every second */
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}
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/* NOT REACHED */
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{
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freeaddrinfo(multicastAddr);
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int hops = 5;
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close(sock);
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if (setsockopt(sender, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) != 0)
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return 0;
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{
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DieWithError("setsockopt(MULTICAST_HOPS) failed");
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}
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}
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/* Join the multicast group. */
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if ((multicastAddr->ai_family == PF_INET6)&&(multicastAddr->ai_addrlen == sizeof(struct sockaddr_in6)))
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{
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(multicastAddr->ai_addr);
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struct ipv6_mreq multicastRequest; /* Multicast address join structure */
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/* Specify the multicast group */
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memcpy(&multicastRequest.ipv6mr_multiaddr, &(addr)->sin6_addr, sizeof(multicastRequest.ipv6mr_multiaddr));
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/* Accept multicast from any interface */
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multicastRequest.ipv6mr_interface = addr->sin6_scope_id;
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/* Join the multicast address */
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if (setsockopt(listener, IPPROTO_IPV6, IPV6_JOIN_GROUP, (char*) &multicastRequest, sizeof(multicastRequest)) != 0)
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{
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DieWithError("setsockopt(IPV6_JOIN_GROUP) failed");
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}
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} else {
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DieWithError("Not IPv6");
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}
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for (;;) /* Run forever */
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{
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int n;
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int max_fd;
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struct timeval timeout;
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fd_set input;
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char recvString[500]; /* Buffer for received string */
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int recvStringLen; /* Length of received string */
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char sendString[] = "Say Hello\n";
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size_t sendStringLen = sizeof(sendString)-1;
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char errorString[] = "That is not correct! Try again!\n";
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struct sockaddr_in6 from;
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socklen_t fromlen = sizeof(from);
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FD_ZERO(&input);
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FD_SET(listener, &input);
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max_fd = listener + 1;
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timeout.tv_sec = 1;
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timeout.tv_usec = 0;
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n = select(max_fd, &input, NULL, NULL, &timeout);
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/* See if there was an error */
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if (n < 0)
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{
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perror("select failed");
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} else if (n == 0) {
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puts("TIMEOUT");
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} else {
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if (FD_ISSET(listener, &input))
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{
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recvStringLen = recvfrom(listener, recvString, sizeof(recvString) - 1, 0,
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(struct sockaddr *)&from, &fromlen);
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/* Receive a single datagram from the server */
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if (recvStringLen < 0)
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{
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DieWithError("recvfrom() failed");
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}
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recvString[recvStringLen] = '\0';
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if (strcmp(recvString, "hello")==0)
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{
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printf("Correct!!\n");
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sendto(listener, token, sizeof(sendString), 0, (struct sockaddr *)&from, fromlen);
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} else {
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sendto(listener, errorString, sizeof(errorString), 0, (struct sockaddr *)&from, fromlen);
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}
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/* Print the received string */
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printf("Received string [%s]\n", recvString);
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}
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}
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int sendLen = sendto(sender, sendString, sendStringLen, 0, multicastAddr->ai_addr,
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multicastAddr->ai_addrlen);
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if (sendLen == sendStringLen)
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{
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printf("Sent [%s] (%i bytes) to %s, port %s\n", sendString, sendLen,
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multicastIP, multicastPort);
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} else {
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DieWithError("sendto() sent a different number of bytes than expected");
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}
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}
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/* NOT REACHED */
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freeaddrinfo(multicastAddr);
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close(sender);
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close(listener);
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return 0;
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}
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}
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