X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/763d5e6ad88ef3ba1cd1d7742d060e4f1e54c6b8..d6ea854ab50aedf15bda9ad18f46ca80b50582a8:/lib/addr.c

diff --git a/lib/addr.c b/lib/addr.c
index f994ac6..8288e4e 100644
--- a/lib/addr.c
+++ b/lib/addr.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of DisOrder.
- * Copyright (C) 2004 Richard Kettlewell
+ * Copyright (C) 2004, 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
@@ -17,6 +17,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  * USA
  */
+/** @file lib/addr.c
+ * @brief Socket address support */
 
 #include <config.h>
 #include "types.h"
@@ -27,34 +29,61 @@
 #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
+ * @param pref Hints structure for getaddrinfo, or NULL
+ * @param namep Where to store address description, or NULL
+ * @return Address info structure or NULL on error
+ *
+ * This converts one or two strings into an address specification suitable
+ * for passing to socket(), bind() etc.
+ *
+ * If there is only one string then it is assumed to be the service
+ * name (port number).  If there are two then the first is the host
+ * name and the second the service name.
+ *
+ * @p namep is used to return a description of the address suitable
+ * for use in log messages.
+ *
+ * If an error occurs a message is logged and a null pointer returned.
+ */
 struct addrinfo *get_address(const struct stringlist *a,
 			     const struct addrinfo *pref,
 			     char **namep) {
   struct addrinfo *res;
   char *name;
   int rc;
-  
-  if(a->n == 1) {
+
+  switch(a->n) {  
+  case 1:
     byte_xasprintf(&name, "host * service %s", a->s[0]);
     if((rc = getaddrinfo(0, a->s[0], pref, &res))) {
       error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc));
       return 0;
     }
-  } else {
+    break;
+  case 2:
     byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]);
     if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) {
       error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc));
       return 0;
     }
+    break;
+  default:
+    error(0, "invalid network address specification (n=%d)", a->n);
+    return 0;
   }
-  if(!res || res->ai_socktype != SOCK_STREAM) {
-    error(0, "getaddrinfo didn't give us a stream socket");
+  if(!res || (pref && res->ai_socktype != pref->ai_socktype)) {
+    error(0, "getaddrinfo didn't give us a suitable socket address");
     if(res)
       freeaddrinfo(res);
     return 0;
@@ -64,6 +93,10 @@ 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;
@@ -91,7 +124,75 @@ int addrinfocmp(const struct addrinfo *a,
     return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */
   }
 }
-  
+
+static inline int multicast4(const struct sockaddr_in *sin) {
+  return IN_MULTICAST(ntohl(sin->sin_addr.s_addr));
+}
+
+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;
+  }
+}
+
+static inline char *format_sockaddr4(const struct sockaddr_in *sin) {
+  char buffer[1024], *r;
+
+  if(sin->sin_port)
+    byte_xasprintf(&r, "%s port %u",
+		   inet_ntop(sin->sin_family, &sin->sin_addr,
+			     buffer, sizeof buffer),
+		   ntohs(sin->sin_port));
+  else
+    byte_xasprintf(&r, "%s",
+		   inet_ntop(sin->sin_family, &sin->sin_addr,
+			     buffer, sizeof buffer));
+  return r;
+}
+
+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;
+}
+
+static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
+  return xstrdup(sun->sun_path);
+}
+    
+/** @brief Construct a text description a sockaddr */
+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