From 5c6d46329b2c83ec0bbb8e6344d63517c8d8eec6 Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayned@samba.org>
Date: Wed, 22 Mar 2006 17:48:59 +0000
Subject: [PATCH] If open_socket_in() fails, we now log the reasons why.

---
 socket.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/socket.c b/socket.c
index 8a960613..9079093c 100644
--- a/socket.c
+++ b/socket.c
@@ -333,9 +333,9 @@ static int *open_socket_in(int type, int port, const char *bind_addr,
 			   int af_hint)
 {
 	int one = 1;
-	int s, *socks, maxs, i;
+	int s, *socks, maxs, i, ecnt;
 	struct addrinfo hints, *all_ai, *resp;
-	char portbuf[10];
+	char portbuf[10], **errmsgs;
 	int error;
 
 	memset(&hints, 0, sizeof hints);
@@ -353,17 +353,25 @@ static int *open_socket_in(int type, int port, const char *bind_addr,
 	/* Count max number of sockets we might open. */
 	for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {}
 
-	if (!(socks = new_array(int, maxs + 1)))
+	socks = new_array(int, maxs + 1);
+	errmsgs = new_array(char *, maxs);
+	if (!socks || !errmsgs)
 		out_of_memory("open_socket_in");
 
 	/* We may not be able to create the socket, if for example the
 	 * machine knows about IPv6 in the C library, but not in the
 	 * kernel. */
-	for (resp = all_ai, i = 0; resp; resp = resp->ai_next) {
+	for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) {
 		s = socket(resp->ai_family, resp->ai_socktype,
 			   resp->ai_protocol);
 
 		if (s == -1) {
+			int r = asprintf(&errmsgs[ecnt++],
+				"socket(%d,%d,%d) failed: %s\n",
+				(int)resp->ai_family, (int)resp->ai_socktype,
+				(int)resp->ai_protocol, strerror(errno));
+			if (r < 0)
+				out_of_memory("open_socket_in");
 			/* See if there's another address that will work... */
 			continue;
 		}
@@ -385,6 +393,10 @@ static int *open_socket_in(int type, int port, const char *bind_addr,
 		/* Now we've got a socket - we need to bind it. */
 		if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) {
 			/* Nope, try another */
+			int r = asprintf(&errmsgs[ecnt++],
+				"bind() failed: %s\n", strerror(errno));
+			if (r < 0)
+				out_of_memory("open_socket_in");
 			close(s);
 			continue;
 		}
@@ -396,6 +408,15 @@ static int *open_socket_in(int type, int port, const char *bind_addr,
 	if (all_ai)
 		freeaddrinfo(all_ai);
 
+	/* Only output the socket()/bind() messages if we were totally
+	 * unsuccessful, or if the daemon is being run with -vv. */
+	for (s = 0; s < ecnt; s++) {
+		if (!i || verbose > 1)
+			rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]));
+		free(errmsgs[s]);
+	}
+	free(errmsgs);
+
 	if (!i) {
 		rprintf(FERROR,
 			"unable to bind any inbound sockets on port %d\n",
-- 
2.34.1