pam_motd FIFO patch

--- modules/pam_motd/pam_motd.c	2011-06-21 11:04:56.000000000 +0200
+++ modules/pam_motd/pam_motd.c-patched	2012-06-02 22:09:34.000000000 +0200
@@ -82,16 +82,43 @@

     while ((fd = open(motd_path, O_RDONLY, 0)) >= 0) {
 	struct stat st;
+	if(fstat(fd, &st) == -1) break;

-	/* fill in message buffer with contents of motd */
-	if ((fstat(fd, &st) < 0) || !st.st_size || st.st_size > 0x10000)
-	    break;
+	/* Fira Hack patch to make him read FIFOs aswell
+	 * This is not safe and could use a bunch of additional checks */
+	if (S_ISFIFO(st.st_mode)) {
+
+		int fifo_imotd = 0;
+		int fifo_motdcap = 100;
+		int fifo_readres = 0;

-	if (!(mtmp = malloc(st.st_size+1)))
-	    break;
+
+		mtmp = malloc(fifo_motdcap);

-	if (pam_modutil_read(fd, mtmp, st.st_size) != st.st_size)
-	    break;
+		/* While there is data left in the pipe, read
+		 * by increments of 100 characters - realloc'ing when neccessary */
+		do {
+			mtmp = realloc(mtmp, (fifo_motdcap += 100));
+			fifo_readres = read(fd, &mtmp[fifo_imotd], 100);
+			fifo_imotd += fifo_readres;
+		} while (fifo_readres);
+
+		st.st_size = fifo_imotd + 1;
+
+	} else {
+		/* fill in message buffer with contents of motd */
+		if (!st.st_size || st.st_size > 0x10000)
+		    break;
+
+		if (!(mtmp = malloc(st.st_size+1)))
+		    break;
+
+		if (pam_modutil_read(fd, mtmp, st.st_size) != st.st_size)
+		    break;
+	}

 	if (mtmp[st.st_size-1] == '\n')
 	    mtmp[st.st_size-1] = '\0';