7eb431536b
This is a standalone version of W. Richard Stevens' "sock" program, based on the code available for the UNIX Network Programming book. Adapted and reworked code for W. Richard Stevens' "sock" utility by Christian Kreibich. From the author: In TCP/IP Illustrated Vol. 1, Richard Stevens used a program called "sock" to demonstrate the many properties of TCP/IP. Unfortunately, the book only speaks about how to use the program but does not point to a site for downloading its sources. While sock is contained in the code package accompanying UNIX Network Programming, this code is also getting dated. The program can be used to generate TCP or UDP packets for testing various network features. It runs as either client or server. WWW: http://www.icir.org/christian/sock.html PR: 206345 Submitted by: Steve Jacobson <sjac998@yahoo.com> (with slight modification)
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
--- src/multicast.c.orig 2010-05-28 00:03:25 UTC
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+++ src/multicast.c
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@@ -10,24 +10,96 @@
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#include "sock.h"
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+/*
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+ * Works for IPv4 and IPv6.
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+ * For IPv4, the server is able to join a multicast group such as 224.0.0.1.
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+ * The client is able to connect to the same multicast address and port
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+ * assigned to the server. The client can then send data, which the server
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+ * receives.
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+ * For IPv6, the server is able to join a multicast group of the form ff02::n.
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+ * The client is never able to connect to that address/port, however.
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+ */
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void
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-join_mcast(int fd, struct sockaddr_in *sin)
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+join_mcast_server(int fd, struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
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{
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#ifdef IP_ADD_MEMBERSHIP /* only include if host supports mcasting */
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- u_long inaddr;
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- struct ip_mreq mreq;
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+ u_long inaddr;
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+ struct ip_mreq mreq;
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+ struct ipv6_mreq mreq6;
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- inaddr = sin->sin_addr.s_addr;
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- if (IN_MULTICAST(inaddr) == 0)
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- return; /* not a multicast address */
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+ if (af_46 == AF_INET) {
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+ inaddr = sin->sin_addr.s_addr;
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+ /*
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+ * FreeBSD 8.4: IN_MULTICAST() test fails in the original code
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+ * because it was testing inaddr with the wrong endianness.
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+ * Fixed in this version of the code, at least for FreeBSD.
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+ */
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+ inaddr = ntohl(inaddr);
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- mreq.imr_multiaddr.s_addr = inaddr;
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- mreq.imr_interface.s_addr = htonl(INADDR_ANY); /* need way to change */
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- if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
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- sizeof(mreq)) == -1 )
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- err_sys("IP_ADD_MEMBERSHIP error");
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+ if (IN_MULTICAST(inaddr) == 0) {
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+ return; /* not a multicast address */
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+ }
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+ } else {
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+ if (IN6_IS_ADDR_MULTICAST(&(sin6->sin6_addr)) == 0) {
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+ return; /* not a multicast address */
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+ }
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+ }
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+
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+ if (af_46 == AF_INET) {
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+ mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
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+ /* need way to change */
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+ mreq.imr_interface.s_addr = htonl(INADDR_ANY);
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+ if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
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+ sizeof(mreq)) == -1 ) {
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+ err_sys("IP_ADD_MEMBERSHIP error");
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+ }
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+ } else {
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+ memset((char *)&mreq6, 0, sizeof(mreq6));
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+ mreq6.ipv6mr_multiaddr = sin6->sin6_addr;
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+ mreq6.ipv6mr_interface = sin6->sin6_scope_id;
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+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
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+ sizeof(mreq6)) == -1 ) {
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+ err_sys("IP_ADD_MEMBERSHIP error");
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+ }
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+ }
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if (verbose)
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- fprintf(stderr, "multicast group joined\n");
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+ fprintf(stderr, "multicast group joined\n");
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+#endif /* IP_ADD_MEMBERSHIP */
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+}
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+
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+/*
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+ * Added for IPv6. Fixme: Does not work at present.
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+ * The client is currently unable to connect to the multicast address/port
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+ * which was joined by the server. A function similar to this may be needed
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+ * to permit that connection to be made.
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+ */
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+void
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+join_mcast_client(int fd,
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+ struct sockaddr_in *cli_sin, struct sockaddr_in6 *cli_sin6,
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+ struct sockaddr_in *serv_sin, struct sockaddr_in6 *serv_sin6)
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+{
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+#ifdef IP_ADD_MEMBERSHIP /* only include if host supports mcasting */
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+ struct ipv6_mreq mreq6;
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+
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+ if (af_46 == AF_INET6) {
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+ if (IN6_IS_ADDR_MULTICAST(&(serv_sin6->sin6_addr)) == 0) {
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+ return; /* not a multicast address */
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+ }
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+ }
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+
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+ if (af_46 == AF_INET6) {
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+ memset((char *)&mreq6, 0, sizeof(mreq6));
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+ mreq6.ipv6mr_multiaddr = serv_sin6->sin6_addr;
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+ mreq6.ipv6mr_interface = serv_sin6->sin6_scope_id;
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+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
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+ sizeof(mreq6)) == -1 ) {
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+ err_sys("IP_ADD_MEMBERSHIP error");
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+ }
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+ }
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+
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+ if (verbose) {
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+ fprintf(stderr, "multicast group joined\n");
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+ }
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#endif /* IP_ADD_MEMBERSHIP */
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}
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