hash.c hash.h \
heap.h \
hex.c hex.h \
+ ifreq.c ifreq.h \
inputline.c inputline.h \
kvp.c kvp.h \
log.c log.h log-impl.h \
--- /dev/null
+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2007 Richard Kettlewell
+ *
+ * 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
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+/** @file lib/ffreq.c
+ * @brief Network interface support
+ */
+
+#include <config.h>
+#include "types.h"
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <string.h>
+
+#include "ifreq.h"
+#include "mem.h"
+#include "log.h"
+
+/** @brief Get the list of network interfaces
+ * @param fd File descriptor to use
+ * @param interfaces Where to put pointer to array of interfaces
+ * @param ninterfaces Where to put count of interfaces
+ */
+void ifreq_list(int fd, struct ifreq **interfaces, int *ninterfaces) {
+ struct ifconf ifc;
+ int l;
+
+ ifc.ifc_len = 0;
+ ifc.ifc_req = 0;
+ do {
+ l = ifc.ifc_len = ifc.ifc_len ? 2 * ifc.ifc_len
+ : 16 * (int)sizeof (struct ifreq);
+ if(!l) fatal(0, "out of memory");
+ ifc.ifc_req = xrealloc(ifc.ifc_req, l);
+ if(ioctl(fd, SIOCGIFCONF, &ifc) < 0)
+ fatal(errno, "error calling ioctl SIOCGIFCONF");
+ } while(l == ifc.ifc_len);
+ *ninterfaces = ifc.ifc_len / sizeof (struct ifreq);
+ *interfaces = ifc.ifc_req;
+}
+
+/** @brief Return true if two socket addresses match */
+int sockaddr_equal(const struct sockaddr *a, const struct sockaddr *b) {
+ if(a->sa_family != b->sa_family)
+ return 0;
+ switch(a->sa_family) {
+ case AF_INET:
+ return ((const struct sockaddr_in *)a)->sin_addr.s_addr
+ == ((const struct sockaddr_in *)b)->sin_addr.s_addr;
+ case AF_INET6:
+ return !memcmp(&((const struct sockaddr_in6 *)a)->sin6_addr,
+ &((const struct sockaddr_in6 *)b)->sin6_addr,
+ sizeof (struct in6_addr));
+ default:
+ fatal(0, "unknown address family %d", a->sa_family);
+ }
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
--- /dev/null
+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2007 Richard Kettlewell
+ *
+ * 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
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+/** @file lib/ifreq.h
+ * @brief Network interface support
+ */
+#ifndef IFREQ_H
+#define IFREQ_H
+
+struct ifreq;
+
+/** @brief Get the list of network interfaces
+ * @param fd File descriptor to use
+ * @param interfaces Where to put pointer to array of interfaces
+ * @param ninterfaces Where to put count of interfaces
+ */
+void ifreq_list(int fd, struct ifreq **interfaces, int *ninterfaces);
+
+/** @brief Return true if two socket addresses match */
+int sockaddr_equal(const struct sockaddr *a, const struct sockaddr *b);
+
+#endif /* IFREQ_H */
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
#include <sys/socket.h>
#include <sys/uio.h>
#include <assert.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
#include "configuration.h"
#include "syscalls.h"
#include "addr.h"
#include "timeval.h"
#include "rtp.h"
+#include "ifreq.h"
#include "speaker-protocol.h"
#include "speaker.h"
0
};
static const int one = 1;
- int sndbuf, target_sndbuf = 131072;
+ int sndbuf, target_sndbuf = 131072, n;
socklen_t len;
char *sockname, *ssockname;
default:
fatal(0, "unsupported address family %d", res->ai_family);
}
+ info("multicasting on %s", sockname);
} else {
- /* Presumably just broadcasting */
- if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
- fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+ struct ifreq *ifs;
+ int nifs;
+
+ /* See if the address matches the broadcast address of some interface */
+ ifreq_list(bfd, &ifs, &nifs);
+ for(n = 0; n < nifs; ++n) {
+ if(ioctl(bfd, SIOCGIFBRDADDR, &ifs[n]) < 0)
+ fatal(errno, "error calling ioctl SIOCGIFBRDADDR");
+ if(sockaddr_equal(&ifs[n].ifr_broadaddr, res->ai_addr))
+ break;
+ }
+ if(n < nifs) {
+ if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
+ fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+ info("broadcasting on %s (%s)", sockname, ifs[n].ifr_name);
+ } else
+ info("unicasting on %s", sockname);
}
len = sizeof sndbuf;
if(getsockopt(bfd, SOL_SOCKET, SO_SNDBUF,