Merge pull request #54 from kwoodson/ossh

Adding ssh dynamic hosts capabilities

1 files changed, 210 insertions, 0 deletions

diff --git a/bin/ossh b/bin/ossh
new file mode 100755
index 000000000..0b48ca46c
--- /dev/null
+++ b/bin/ossh
@@ -0,0 +1,210 @@
+#!/usr/bin/env python
+# vim: expandtab:tabstop=4:shiftwidth=4
+
+import argparse
+import ansibleutil
+import traceback
+import sys
+import os
+import re
+
+class Ossh(object):
+    def __init__(self):
+        self.file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)))
+        self.parse_cli_args()
+
+        self.ansible = ansibleutil.AnsibleUtil()
+
+        # get a dict of host inventory
+        if self.args.list:
+            self.get_hosts()
+        else:
+            self.get_hosts(True)
+
+        # parse host and user
+        self.process_host()
+
+        if not self.args.list and not self.env:
+            print "Please specify an environment."
+            return
+
+        if self.args.host == '' and not self.args.list:
+            self.parser.print_help()
+            return
+
+
+        if self.args.debug:
+            print self.args
+
+        # perform the SSH
+        if self.args.list:
+            self.list_hosts()
+        else:
+            self.ssh()
+
+    def parse_cli_args(self):
+        parser = argparse.ArgumentParser(description='Openshift Online SSH Tool.')
+        parser.add_argument('-e', '--env', action="store",
+                          help="Which environment to search for the host ")
+        parser.add_argument('-d', '--debug', default=False,
+                          action="store_true", help="debug mode")
+        parser.add_argument('-v', '--verbose', default=False,
+                          action="store_true", help="Verbose?")
+        parser.add_argument('--list', default=False,
+                          action="store_true", help="list out hosts")
+        parser.add_argument('-c', '--command', action='store',
+                            help='Command to run on remote host')
+        parser.add_argument('-l', '--login_name', action='store',
+                            help='User in which to ssh as')
+
+        parser.add_argument('-o', '--ssh_opts', action='store',
+                            help='options to pass to SSH.\n \
+                                  "-oForwardX11=yes,TCPKeepAlive=yes"')
+        parser.add_argument('host', nargs='?', default='')
+
+        self.args = parser.parse_args()
+        self.parser = parser
+
+
+    def process_host(self):
+        '''Determine host name and user name for SSH.
+        '''
+        self.env = None
+        self.user = None
+
+        re_env = re.compile("\.(" + "|".join(self.host_inventory.keys()) + ")")
+        search = re_env.search(self.args.host)
+        if self.args.env:
+            self.env = self.args.env
+        elif search:
+            # take the first?
+            self.env = search.groups()[0]
+
+        # remove env from hostname command line arg if found
+        if search:
+            self.args.host = re_env.split(self.args.host)[0]
+
+        # parse username if passed
+        if '@' in self.args.host:
+            self.user, self.host = self.args.host.split('@')
+        else:
+            self.host = self.args.host
+            if self.args.login_name:
+                self.user = self.args.login_name
+
+    def get_hosts(self, cache_only=False):
+        '''Query our host inventory and return a dict where the format
+           equals:
+
+           dict['servername'] = dns_name
+        '''
+        if cache_only:
+            self.host_inventory = self.ansible.build_host_dict(['--cache-only'])
+        else:
+            self.host_inventory = self.ansible.build_host_dict()
+
+    def select_host(self, regex=False):
+        '''select host attempts to match the host specified
+           on the command line with a list of hosts.
+
+           if regex is specified then we will attempt to match
+           all *{host_string}* equivalents.
+        '''
+        re_host = re.compile(self.host)
+
+        results = []
+        for hostname, server_info in self.host_inventory[self.env].items():
+            if hostname.split(':')[0] == self.host:
+                # an exact match, return it!
+                return [(hostname, server_info)]
+            elif re_host.search(hostname):
+                results.append((hostname, server_info))
+
+        if results:
+            return results
+        else:
+            print "Could not find specified host: %s in %s" % (self.host, self.env)
+
+        # default - no results found.
+        return None
+
+    def list_hosts(self, limit=None):
+        '''Function to print out the host inventory.
+
+           Takes a single parameter to limit the number of hosts printed.
+        '''
+
+        if self.env:
+            results = self.select_host(True)
+            if len(results) == 1:
+                hostname, server_info = results[0]
+                sorted_keys = server_info.keys()
+                sorted_keys.sort()
+                for key in sorted_keys:
+                    print '{0:<35} {1}'.format(key, server_info[key])
+            else:
+                for host_id, server_info in results[:limit]:
+                    name = server_info['ec2_tag_Name']
+                    ec2_id = server_info['ec2_id']
+                    ip = server_info['ec2_ip_address']
+                    print '{ec2_tag_Name:<35} {ec2_tag_environment:<8} {ec2_id:<15} {ec2_ip_address}'.format(**server_info)
+
+                if limit:
+                    print
+                    print 'Showing only the first %d results...' % limit
+                    print
+
+        else:
+            for env, host_ids in self.host_inventory.items():
+                for host_id, server_info in host_ids.items():
+                    name = server_info['ec2_tag_Name']
+                    ec2_id = server_info['ec2_id']
+                    ip = server_info['ec2_ip_address']
+                    print '{ec2_tag_Name:<35} {ec2_tag_environment:<5} {ec2_id:<15} {ec2_ip_address}'.format(**server_info)
+
+    def ssh(self):
+        '''SSH to a specified host
+        '''
+        try:
+            # shell args start with the program name in position 1
+            ssh_args = ['/usr/bin/ssh']
+
+            if self.user:
+                ssh_args.append('-l%s' % self.user)
+
+            if self.args.verbose:
+                ssh_args.append('-vvv')
+
+            if self.args.ssh_opts:
+                for arg in self.args.ssh_opts.split(","):
+                    ssh_args.append("-o%s" % arg)
+
+            result = self.select_host()
+            if not result:
+                return # early exit, no results
+
+            if len(result) > 1:
+                self.list_hosts(10)
+                return # early exit, too many results
+
+            # Assume we have one and only one.
+            hostname, server_info = result[0]
+            dns = server_info['ec2_public_dns_name']
+
+            ssh_args.append(dns)
+
+            #last argument
+            if self.args.command:
+                ssh_args.append("%s" % self.args.command)
+
+            print "Running: %s\n" % ' '.join(ssh_args)
+
+            os.execve('/usr/bin/ssh', ssh_args, os.environ)
+        except:
+            print traceback.print_exc()
+            print sys.exc_info()
+
+
+if __name__ == '__main__':
+    ossh = Ossh()
+