X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/ec6f84883b0a6d69bf01ae972f1adbe74a36f361..401d3485a7923ae9b83b23399bee0ef8d19d0444:/lib/addr.c?ds=sidebyside

diff --git a/lib/addr.c b/lib/addr.c
index 153130b..fecc28c 100644
--- a/lib/addr.c
+++ b/lib/addr.c
@@ -1,37 +1,35 @@
 /*
  * This file is part of DisOrder.
- * Copyright (C) 2004 Richard Kettlewell
+ * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * 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
+ * the Free Software Foundation, either version 3 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.
- *
+ * 
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+/** @file lib/addr.c
+ * @brief Socket address support */
 
-#include <config.h>
-#include "types.h"
+#include "common.h"
 
-#include <stdio.h>
-#include <string.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
-#include <netdb.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
 
 #include "log.h"
 #include "printf.h"
-#include "configuration.h"
 #include "addr.h"
+#include "mem.h"
 
 /** @brief Convert a pair of strings to an address
  * @param a Pointer to string list
@@ -88,6 +86,10 @@ struct addrinfo *get_address(const struct stringlist *a,
   return res;
 }
 
+/** @brief Comparison function for address information
+ *
+ * Suitable for qsort().
+ */
 int addrinfocmp(const struct addrinfo *a,
 		const struct addrinfo *b) {
   const struct sockaddr_in *ina, *inb;
@@ -96,7 +98,7 @@ int addrinfocmp(const struct addrinfo *a,
   if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
   if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
   if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;
-  switch(a->ai_protocol) {
+  switch(a->ai_family) {
   case PF_INET:
     ina = (const struct sockaddr_in *)a->ai_addr;
     inb = (const struct sockaddr_in *)b->ai_addr;
@@ -115,7 +117,83 @@ int addrinfocmp(const struct addrinfo *a,
     return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */
   }
 }
-  
+
+/** @brief Return nonzero if @p sin4 is an IPv4 multicast address */
+static inline int multicast4(const struct sockaddr_in *sin4) {
+  return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr));
+}
+
+/** @brief Return nonzero if @p sin6 is an IPv6 multicast address */
+static inline int multicast6(const struct sockaddr_in6 *sin6) {
+  return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
+}
+
+/** @brief Return true if @p sa represents a multicast address */
+int multicast(const struct sockaddr *sa) {
+  switch(sa->sa_family) {
+  case AF_INET:
+    return multicast4((const struct sockaddr_in *)sa);
+  case AF_INET6:
+    return multicast6((const struct sockaddr_in6 *)sa);
+  default:
+    return 0;
+  }
+}
+
+/** @brief Format an IPv4 address */
+static inline char *format_sockaddr4(const struct sockaddr_in *sin4) {
+  char buffer[1024], *r;
+
+  if(sin4->sin_port)
+    byte_xasprintf(&r, "%s port %u",
+		   inet_ntop(sin4->sin_family, &sin4->sin_addr,
+			     buffer, sizeof buffer),
+		   ntohs(sin4->sin_port));
+  else
+    byte_xasprintf(&r, "%s",
+		   inet_ntop(sin4->sin_family, &sin4->sin_addr,
+			     buffer, sizeof buffer));
+  return r;
+}
+
+/** @brief Format an IPv6 address */
+static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) {
+  char buffer[1024], *r;
+
+  if(sin6->sin6_port)
+    byte_xasprintf(&r, "%s port %u",
+		   inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
+			     buffer, sizeof buffer),
+		   ntohs(sin6->sin6_port));
+  else
+    byte_xasprintf(&r, "%s",
+		   inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
+			     buffer, sizeof buffer));
+  return r;
+}
+
+/** @brief Format a UNIX socket address */
+static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
+  return xstrdup(sun->sun_path);
+}
+    
+/** @brief Construct a text description a sockaddr
+ * @param sa Socket address
+ * @return Human-readable form of address
+ */
+char *format_sockaddr(const struct sockaddr *sa) {
+  switch(sa->sa_family) {
+  case AF_INET:
+    return format_sockaddr4((const struct sockaddr_in *)sa);
+  case AF_INET6:
+    return format_sockaddr6((const struct sockaddr_in6 *)sa);
+  case AF_UNIX:
+    return format_sockaddrun((const struct sockaddr_un *)sa);
+  default:
+    return 0;
+  }
+}
+
 /*
 Local Variables:
 c-basic-offset:2