From 2f077aec530acecd7876a562ac787f38c0f47116 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Sat, 2 Oct 1999 11:50:01 +0000
Subject: Multihome handling.

svn path=/trunk/; revision=2629
---
 socket.c | 51 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 23 deletions(-)

(limited to 'socket.c')

diff --git a/socket.c b/socket.c
index c852e641..c0925723 100644
--- a/socket.c
+++ b/socket.c
@@ -152,7 +152,7 @@ int SockOpen(const char *host, int clientPort, const char *options,
 #ifndef HAVE_INET_ATON
     unsigned long inaddr;
 #endif /* HAVE_INET_ATON */
-    struct sockaddr_in ad;
+    struct sockaddr_in ad, **pptr;
     struct hostent *hp;
 
 #ifdef HAVE_SOCKETPAIR
@@ -195,30 +195,35 @@ int SockOpen(const char *host, int clientPort, const char *options,
 	    return -1;
 	}
 	/*
-	 * FIXME: make this work for multihomed hosts.
-	 * We're toast if we get back multiple addresses and h_addrs[0]
-	 * (aka h_addr) is not one we can actually connect to; this happens
-	 * with multi-homed boxen.
+	 * Try all addresses of a possibly multihomed host until we get
+	 * a successful connect or until we run out of addresses.
 	 */
-        memcpy(&ad.sin_addr, hp->h_addr, hp->h_length);
-    }
-    ad.sin_port = htons(clientPort);
-    
-    sock = socket(AF_INET, SOCK_STREAM, 0);
-    if (sock < 0)
-    {
-	h_errno = 0;
-        return -1;
-    }
-    if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
-    {
-	int olderr = errno;
-	close(sock);
-	h_errno = 0;
-	errno = olderr;
-        return -1;
+	pptr = (struct sockaddr_in **)hp->h_addr_list;
+	for(; *pptr != NULL; pptr++)
+	{
+	    sock = socket(AF_INET, SOCK_STREAM, 0);
+	    if (sock < 0)
+	    {
+		h_errno = 0;
+		return -1;
+	    }
+	    ad.sin_port = htons(clientPort);
+	    memcpy(&ad.sin_addr, *pptr, sizeof(struct in_addr));
+	    if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) == 0)
+		break; /* success */
+	    close(sock);
+	    memset(&ad, 0, sizeof(ad));
+	    ad.sin_family = AF_INET;
+	}
+	if(*pptr == NULL)
+	{
+	    int olderr = errno;
+	    close(sock);
+	    h_errno = 0;
+	    errno = olderr;
+	    return -1;
+	}
     }
-
     return(sock);
 }
 #endif /* INET6 */
-- 
cgit v1.2.3