[Ovirt-devel] [PATCH-node 1/2] Add ovirt-listen-awake daemon. This is a very small daemon that oVirt

Chris Lalancette clalance at redhat.com
Wed Sep 10 06:42:12 UTC 2008


Signed-off-by: Chris Lalancette <clalance at redhat.com>
---
:100644 100644 0ae494d... fad3fb5... M	Makefile.am
:100644 100644 453d015... e6ba7e3... M	configure.ac
:000000 100644 0000000... d511905... A	ovirt-listen-awake/COPYING
:000000 100644 0000000... b7f299c... A	ovirt-listen-awake/Makefile.am
:000000 100644 0000000... 7ecd0a7... A	ovirt-listen-awake/ovirt-listen-awake.c
:100644 100644 5c092b4... 736338d... M	ovirt-node.spec
 Makefile.am                             |    2 +-
 configure.ac                            |    2 +-
 ovirt-listen-awake/COPYING              |  339 +++++++++++++++++++++++++++++++
 ovirt-listen-awake/Makefile.am          |   22 ++
 ovirt-listen-awake/ovirt-listen-awake.c |  225 ++++++++++++++++++++
 ovirt-node.spec                         |    7 +-
 6 files changed, 594 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 0ae494d..fad3fb5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,7 +15,7 @@
 # MA  02110-1301, USA.  A copy of the GNU General Public License is
 # also available at http://www.gnu.org/copyleft/gpl.html.
 
-SUBDIRS = ovirt-identify-node
+SUBDIRS = ovirt-identify-node ovirt-listen-awake
 
 EXTRA_DIST =			\
   .gitignore			\
diff --git a/configure.ac b/configure.ac
index 453d015..e6ba7e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,5 +13,5 @@ PKG_CHECK_MODULES([VIRT], [libvirt >= 0.4.4])
 test x"$ac_ct_CC:$CFLAGS" = 'xgcc:-g -O2' \
   && CFLAGS="$CFLAGS -Wshadow -Wall -Werror"
 
-AC_CONFIG_FILES([Makefile ovirt-identify-node/Makefile])
+AC_CONFIG_FILES([Makefile ovirt-identify-node/Makefile ovirt-listen-awake/Makefile])
 AC_OUTPUT
diff --git a/ovirt-listen-awake/COPYING b/ovirt-listen-awake/COPYING
new file mode 100644
index 0000000..d511905
--- /dev/null
+++ b/ovirt-listen-awake/COPYING
@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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diff --git a/ovirt-listen-awake/Makefile.am b/ovirt-listen-awake/Makefile.am
new file mode 100644
index 0000000..b7f299c
--- /dev/null
+++ b/ovirt-listen-awake/Makefile.am
@@ -0,0 +1,22 @@
+# Copyright (C) 2008 Red Hat, Inc.
+#
+# 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
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA  02110-1301, USA.  A copy of the GNU General Public License is
+# also available at http://www.gnu.org/copyleft/gpl.html.
+
+bin_PROGRAMS = ovirt-listen-awake
+
+EXTRA_DIST = ovirt-listen-awake.init ovirt-convert-host ovirt-unconvert-host
+
+ovirt_listen_awake_SOURCES = ovirt-listen-awake.c
diff --git a/ovirt-listen-awake/ovirt-listen-awake.c b/ovirt-listen-awake/ovirt-listen-awake.c
new file mode 100644
index 0000000..7ecd0a7
--- /dev/null
+++ b/ovirt-listen-awake/ovirt-listen-awake.c
@@ -0,0 +1,225 @@
+/* ovirt-listen-awake: daemon to listen for and respond to AWAKE requests
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ * Written by Chris Lalancette <clalance at redhat.com>
+ *
+ * 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
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301, USA.  A copy of the GNU General Public License is
+ * also available at http://www.gnu.org/copyleft/gpl.html.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <ctype.h>
+
+// We only ever expect to receive the strings "AWAKE" or "IDENTIFY", so
+// 20 bytes is more than enough
+#define BUFLEN 20
+#define LOGFILE "/var/log/ovirt-host.log"
+
+static int streq(char *first, char *second)
+{
+  int first_len, second_len;
+
+  first_len = strlen(first);
+  second_len = strlen(second);
+
+  if (first_len == second_len && strncmp(first, second, first_len) == 0)
+    return 1;
+  return 0;
+}
+
+// Given a buffer, find the first whitespace character, replace it with \0,
+// and return
+static void find_first_whitespace(char *buffer)
+{
+  int i;
+
+  i = 0;
+  while (buffer[i] != '\0') {
+    if (isspace(buffer[i])) {
+      // once we see the first whitespace character, we are done
+      buffer[i] ='\0';
+      break;
+    }
+    i++;
+  }
+}
+
+static int listenSocket(int listen_port)
+{
+  struct sockaddr_in a;
+  int s,yes;
+
+  if (listen_port < 0) {
+    error(0, 0, "Invalid listen_port %d", listen_port);
+    return -1;
+  }
+
+  s = socket(AF_INET, SOCK_STREAM, 0);
+  if (s < 0) {
+    error(0, errno, "Failed creating socket");
+    return -1;
+  }
+
+  yes = 1;
+  if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,(char *)&yes, sizeof (yes)) < 0) {
+    error(0, errno, "Failed setsockopt");
+    close(s);
+    return -1;
+  }
+
+  memset (&a, 0, sizeof (a));
+  a.sin_port = htons (listen_port);
+  a.sin_family = AF_INET;
+  if (bind(s, (struct sockaddr *) &a, sizeof (a)) < 0) {
+    error(0, errno, "Error binding to port %d", listen_port);
+    close(s);
+    return -1;
+  }
+
+  if (listen(s, 10) < 0) {
+    error(0, errno, "Error listening on port %d", listen_port);
+    close(s);
+    return -1;
+  }
+  return s;
+}
+
+static void usage(int exitcode)
+{
+  printf("Usage: ovirt-listen-awake [OPTIONS]\n");
+  printf("OPTIONS:\n");
+  printf(" -h\t\tShow this help message\n");
+  printf(" -n\t\tDo not daemonize (useful for debugging)\n");
+  exit(exitcode);
+}
+
+int main(int argc, char *argv[])
+{
+  int listen_socket, conn;
+  struct sockaddr_in client_address;
+  unsigned int addrlen;
+  FILE *conn_stream;
+  FILE *logfile;
+  char buffer[BUFLEN];
+  int c;
+  int do_daemon;
+  int i;
+
+  do_daemon = 1;
+
+  while ((c=getopt(argc, argv, ":hn")) != -1) {
+    switch(c) {
+    case 'h':
+      usage(0);
+      break;
+    case 'n':
+      do_daemon = 0;
+      break;
+    default:
+      usage(1);
+    }
+  }
+
+  if ((argc-optind) != 0) {
+    for (i = optind; i < argc ; i ++) {
+      fprintf(stderr, "Extra operand %s\n", argv[i]);
+    }
+    error(1, 0, "Try --help for more information");
+  }
+
+  listen_socket = listenSocket(7777);
+  if (listen_socket < 0)
+    return 2;
+
+  if (do_daemon) {
+    logfile = fopen(LOGFILE,"a+");
+    if (logfile == NULL)
+      error(3, errno, "Error opening logfile %s", LOGFILE);
+
+    // NOTE: this closes stdout and stderr
+    if (daemon(0, 0) < 0)
+      error(4, errno, "Error daemonizing");
+
+    // so re-open them to the logfile here
+    dup2(fileno(logfile), STDOUT_FILENO);
+    dup2(fileno(logfile), STDERR_FILENO);
+  }
+
+  while (1) {
+    addrlen = sizeof(client_address);
+    memset(&client_address, 0, addrlen);
+    memset(buffer, 0, BUFLEN);
+    conn = accept(listen_socket, (struct sockaddr *)&client_address, &addrlen);
+    if (conn < 0) {
+      error(0, errno, "Error accepting socket");
+      continue;
+    }
+
+    conn_stream = fdopen(conn, "r");
+    if (conn_stream == NULL) {
+      error(0, errno, "Error converting fd to stream");
+      close(conn);
+      continue;
+    }
+
+    if (fgets(buffer, BUFLEN, conn_stream) == NULL) {
+      error(0, errno, "Error receiving data");
+      fclose(conn_stream);
+      continue;
+    }
+
+    find_first_whitespace(buffer);
+
+    if (streq(buffer, "IDENTIFY")) {
+      // run ovirt-identify-node against 192.168.50.2 (the WUI node)
+      fprintf(stderr, "Doing identify\n");
+      // FIXME: it would be best to call the "find_srv" shell script here to
+      // find out where we should contact.  However, we would still have to
+      // hardcode which DNS server to use (192.168.50.2), and which domain
+      // name to use "priv.ovirt.org" to get this to work.  I don't have
+      // a good idea how to solve this at the moment.
+      system("ovirt-identify-node -s 192.168.50.2 -p 12120");
+    }
+    else if (streq(buffer, "AWAKE")) {
+      // run ovirt-awake against 192.168.50.2
+      fprintf(stderr, "Doing awake\n");
+      // FIXME: I hate to duplicate this stuff here, but I can't use the
+      // ovirt init scripts as-is; they depend too much on the environment
+      // (in particular, which DNS server to use to resolve, and which
+      // domainname).  Until I come up with a good solution for that, I'll
+      // have to leave this as-is.
+      system("wget -q http://192.168.50.2:80/ipa/config/krb5.ini -O /etc/krb5.conf");
+      system("ovirt-awake start 192.168.50.2 12120 /etc/libvirt/krb5.tab");
+    }
+    else {
+      error(0, 0, "Unknown command %s", buffer);
+    }
+
+    fclose(conn_stream);
+  }
+
+  close(listen_socket);
+  fclose(logfile);
+
+  return 0;
+}
diff --git a/ovirt-node.spec b/ovirt-node.spec
index 5c092b4..736338d 100644
--- a/ovirt-node.spec
+++ b/ovirt-node.spec
@@ -43,6 +43,7 @@ make
 
 %{__install} -p -m0755 scripts/ovirt-awake %{buildroot}%{_sbindir}
 %{__install} -p -m0755 ovirt-identify-node/ovirt-identify-node %{buildroot}%{_sbindir}
+%{__install} -p -m0755 ovirt-listen-awake/ovirt-listen-awake %{buildroot}%{_sbindir}
 
 %{__install} -p -m0644 scripts/ovirt-functions %{buildroot}%{_initrddir}
 %{__install} -p -m0755 scripts/ovirt-early %{buildroot}%{_initrddir}
@@ -130,6 +131,7 @@ fi
 %defattr(-,root,root,0755)
 %{_sbindir}/ovirt-awake
 %{_sbindir}/ovirt-identify-node
+%{_sbindir}/ovirt-listen-awake
 %{_initrddir}/ovirt-early
 %{_initrddir}/ovirt
 %{_initrddir}/ovirt-post
@@ -147,9 +149,12 @@ fi
 %doc ovirt-identify-node/COPYING
 
 %changelog
-* Mon Sep  8 2008 Jim Meyering <meyering at redhat.com> - 0.92 0.4
+* Mon Sep  8 2008 Jim Meyering <meyering at redhat.com> - 0.92 0.6
 - Update ovirt-identify-node's build rule.
 
+* Fri Aug 22 2008 Chris Lalancette <clalance at redhat.com> - 0.92 0.5
+- Add the ovirt-listen-awake daemon to the RPM
+
 * Fri Aug 22 2008 Chris Lalancette <clalance at redhat.com> - 0.92 0.4
 - Re-arrange the directory layout, in preparation for ovirt-listen-awake
 
-- 
1.5.4.1




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