Initial revisionXORG-STABLE

1 files changed, 195 insertions, 0 deletions

diff --git a/prngc.c b/prngc.c
new file mode 100644
index 0000000..268f983
--- /dev/null
+++ b/prngc.c
@@ -0,0 +1,195 @@
+/* $XFree86: xc/programs/xdm/prngc.c,v 1.4 2003/11/04 20:17:04 dawes Exp $ */
+/*
+ * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
+ * Copyright (c) 2001-2002 Damien Miller.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <X11/Xos.h>
+#ifndef X_NO_SYS_UN
+#ifndef Lynx
+#include	<sys/un.h>
+#else
+#include	<un.h>
+#endif
+#endif
+#include <netinet/in.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "dm_auth.h"
+#include "dm_error.h"
+
+#ifndef INADDR_LOOPBACK
+#define INADDR_LOOPBACK 0x7F000001U
+#endif
+
+static ssize_t atomicio(ssize_t (*)(), int, void *, size_t);
+
+#ifndef offsetof
+#  define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+/*
+ * Collect 'len' bytes of entropy into 'buf' from PRNGD/EGD daemon
+ * listening either on 'tcp_port', or via Unix domain socket at *
+ * 'socket_path'.
+ * Either a non-zero tcp_port or a non-null socket_path must be 
+ * supplied.
+ * Returns 0 on success, -1 on error
+ */
+int
+get_prngd_bytes(char *buf, int len, 
+    unsigned short tcp_port, char *socket_path)
+{
+	int fd, addr_len, rval, errors;
+	char msg[2];
+	struct sockaddr *addr;
+	struct sockaddr_in addr_in;
+	struct sockaddr_un addr_un;
+	int af;
+	void (*old_sigpipe)(int);
+
+	/* Sanity checks */
+	if (socket_path == NULL && tcp_port == 0) {
+		LogError("get_random_prngd: "
+		    "You must specify a port or a socket\n");
+		return -1;
+	}
+	if (socket_path != NULL &&
+	    strlen(socket_path) >= sizeof(addr_un.sun_path)) {
+		LogError("get_random_prngd: Random pool path is too long\n");
+		return -1;
+	}
+	if (len > 255) {
+		LogError("get_random_prngd: "
+		    "Too many bytes to read from PRNGD\n");
+		return -1;
+	}
+
+	memset(&addr_in, '\0', sizeof(addr));
+
+	if (tcp_port != 0) {
+		af = addr_in.sin_family = AF_INET;
+		addr_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+		addr_in.sin_port = htons(tcp_port);
+		addr_len = sizeof(addr_in);
+		addr = (struct sockaddr *)&addr_in;
+	} else {
+		af = addr_un.sun_family = AF_UNIX;
+		strncpy(addr_un.sun_path, socket_path,
+		    sizeof(addr_un.sun_path));
+		addr_len = offsetof(struct sockaddr_un, sun_path) +
+		    strlen(socket_path) + 1;
+		addr = (struct sockaddr *)&addr_un;
+	}
+
+	old_sigpipe = signal(SIGPIPE, SIG_IGN);
+
+	errors = 0;
+	rval = -1;
+reopen:
+	fd = socket(af, SOCK_STREAM, 0);
+	if (fd == -1) {
+		LogInfo("Couldn't create socket: %s\n", strerror(errno));
+		goto done;
+	}
+
+	if (connect(fd, (struct sockaddr*)addr, addr_len) == -1) {
+		if (af == AF_INET) {
+			LogInfo("Couldn't connect to PRNGD port %d: %s\n",
+			    tcp_port, strerror(errno));
+		} else {
+			LogInfo("Couldn't connect to PRNGD socket"
+			    " \"%s\": %s\n",
+			    addr_un.sun_path, strerror(errno));
+		}
+		goto done;
+	}
+
+	/* Send blocking read request to PRNGD */
+	msg[0] = 0x02;
+	msg[1] = len;
+
+	if (atomicio(write, fd, msg, sizeof(msg)) != sizeof(msg)) {
+		if (errno == EPIPE && errors < 10) {
+			close(fd);
+			errors++;
+			goto reopen;
+		}
+		LogInfo("Couldn't write to PRNGD socket: %s\n",
+		    strerror(errno));
+		goto done;
+	}
+
+	if (atomicio(read, fd, buf, len) != len) {
+		if (errno == EPIPE && errors < 10) {
+			close(fd);
+			errors++;
+			goto reopen;
+		}
+		LogInfo("Couldn't read from PRNGD socket: %s\n",
+		    strerror(errno));
+		goto done;
+	}
+
+	rval = 0;
+done:
+	signal(SIGPIPE, old_sigpipe);
+	if (fd != -1)
+		close(fd);
+	return rval;
+}
+
+/*
+ * ensure all of data on socket comes through. f==read || f==write
+ */
+static ssize_t
+atomicio(ssize_t (*f)(), int fd, void *_s, size_t n)
+{
+	char *s = _s;
+	ssize_t res, pos = 0;
+
+	while (n > pos) {
+		res = (f) (fd, s + pos, n - pos);
+		switch (res) {
+		case -1:
+#ifdef EWOULDBLOCK
+			if (errno == EINTR || errno == EAGAIN 
+			    || errno == EWOULDBLOCK)
+#else
+			if (errno == EINTR || errno == EAGAIN)
+#endif
+				continue;
+		case 0:
+			return (res);
+		default:
+			pos += res;
+		}
+	}
+	return (pos);
+}