/*
* 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
* it under the terms of the GNU General Public License as published by
* 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"
+#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
+ * @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;
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;
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;
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
~mdw / disorder / blobdiff