lib/common/ipc_pacemakerd.c

/* */
This source file includes following definitions.
pcmk_pacemakerd_api_daemon_state_text2enum
pcmk_pacemakerd_api_daemon_state_enum2text
new_data
free_data
post_connect
post_disconnect
reply_expected
dispatch
pcmk__pacemakerd_api_methods
pcmk_pacemakerd_api_ping
   1 /*
   2  * Copyright 2020 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU Lesser General Public License
   7  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 
  12 #include <stdlib.h>
  13 #include <time.h>
  14 
  15 #include <crm/crm.h>
  16 #include <crm/msg_xml.h>
  17 #include <crm/common/xml.h>
  18 #include <crm/common/ipc.h>
  19 #include <crm/common/ipc_internal.h>
  20 #include <crm/common/ipc_pacemakerd.h>
  21 #include "crmcommon_private.h"
  22 
  23 typedef struct pacemakerd_api_private_s {
  24     enum pcmk_pacemakerd_state state;
  25     char *client_uuid;
  26 } pacemakerd_api_private_t;
  27 
  28 static const char *pacemakerd_state_str[] = {
  29     XML_PING_ATTR_PACEMAKERDSTATE_INIT,
  30     XML_PING_ATTR_PACEMAKERDSTATE_STARTINGDAEMONS,
  31     XML_PING_ATTR_PACEMAKERDSTATE_WAITPING,
  32     XML_PING_ATTR_PACEMAKERDSTATE_RUNNING,
  33     XML_PING_ATTR_PACEMAKERDSTATE_SHUTTINGDOWN,
  34     XML_PING_ATTR_PACEMAKERDSTATE_SHUTDOWNCOMPLETE
  35 };
  36 
  37 enum pcmk_pacemakerd_state
  38 pcmk_pacemakerd_api_daemon_state_text2enum(const char *state)
     /*  */
  39 {
  40     int i;
  41 
  42     if (state == NULL) {
  43         return pcmk_pacemakerd_state_invalid;
  44     }
  45     for (i=pcmk_pacemakerd_state_init; i <= pcmk_pacemakerd_state_max;
  46          i++) {
  47         if (pcmk__str_eq(state, pacemakerd_state_str[i], pcmk__str_none)) {
  48             return i;
  49         }
  50     }
  51     return pcmk_pacemakerd_state_invalid;
  52 }
  53 
  54 const char *
  55 pcmk_pacemakerd_api_daemon_state_enum2text(
     /*  */
  56     enum pcmk_pacemakerd_state state)
  57 {
  58     if ((state >= pcmk_pacemakerd_state_init) &&
  59         (state <= pcmk_pacemakerd_state_max)) {
  60         return pacemakerd_state_str[state];
  61     }
  62     return "invalid";
  63 }
  64 
  65 // \return Standard Pacemaker return code
  66 static int
  67 new_data(pcmk_ipc_api_t *api)
     /*  */
  68 {
  69     struct pacemakerd_api_private_s *private = NULL;
  70 
  71     api->api_data = calloc(1, sizeof(struct pacemakerd_api_private_s));
  72 
  73     if (api->api_data == NULL) {
  74         return errno;
  75     }
  76 
  77     private = api->api_data;
  78     private->state = pcmk_pacemakerd_state_invalid;
  79     /* other as with cib, controld, ... we are addressing pacemakerd just
  80        from the local node -> pid is unique and thus sufficient as an ID
  81      */
  82     private->client_uuid = pcmk__getpid_s();
  83 
  84     return pcmk_rc_ok;
  85 }
  86 
  87 static void
  88 free_data(void *data)
     /*  */
  89 {
  90     free(((struct pacemakerd_api_private_s *) data)->client_uuid);
  91     free(data);
  92 }
  93 
  94 // \return Standard Pacemaker return code
  95 static int
  96 post_connect(pcmk_ipc_api_t *api)
     /*  */
  97 {
  98     struct pacemakerd_api_private_s *private = NULL;
  99 
 100     if (api->api_data == NULL) {
 101         return EINVAL;
 102     }
 103     private = api->api_data;
 104     private->state = pcmk_pacemakerd_state_invalid;
 105 
 106     return pcmk_rc_ok;
 107 }
 108 
 109 static void
 110 post_disconnect(pcmk_ipc_api_t *api)
     /*  */
 111 {
 112     struct pacemakerd_api_private_s *private = NULL;
 113 
 114     if (api->api_data == NULL) {
 115         return;
 116     }
 117     private = api->api_data;
 118     private->state = pcmk_pacemakerd_state_invalid;
 119 
 120     return;
 121 }
 122 
 123 static bool
 124 reply_expected(pcmk_ipc_api_t *api, xmlNode *request)
     /*  */
 125 {
 126     const char *command = crm_element_value(request, F_CRM_TASK);
 127 
 128     if (command == NULL) {
 129         return false;
 130     }
 131 
 132     // We only need to handle commands that functions in this file can send
 133     return !strcmp(command, CRM_OP_PING);
 134 }
 135 
 136 static void
 137 dispatch(pcmk_ipc_api_t *api, xmlNode *reply)
     /*  */
 138 {
 139     crm_exit_t status = CRM_EX_OK;
 140     xmlNode *msg_data = NULL;
 141     pcmk_pacemakerd_api_reply_t reply_data = {
 142         pcmk_pacemakerd_reply_unknown
 143     };
 144     const char *value = NULL;
 145     long long value_ll = 0;
 146 
 147     value = crm_element_value(reply, F_CRM_MSG_TYPE);
 148     if ((value == NULL) || (strcmp(value, XML_ATTR_RESPONSE))) {
 149         crm_debug("Unrecognizable pacemakerd message: invalid message type '%s'",
 150                   crm_str(value));
 151         status = CRM_EX_PROTOCOL;
 152         goto done;
 153     }
 154 
 155     if (crm_element_value(reply, XML_ATTR_REFERENCE) == NULL) {
 156         crm_debug("Unrecognizable pacemakerd message: no reference");
 157         status = CRM_EX_PROTOCOL;
 158         goto done;
 159     }
 160 
 161     value = crm_element_value(reply, F_CRM_TASK);
 162     if ((value == NULL) || strcmp(value, CRM_OP_PING)) {
 163         crm_debug("Unrecognizable pacemakerd message: '%s'", crm_str(value));
 164         status = CRM_EX_PROTOCOL;
 165         goto done;
 166     }
 167 
 168     // Parse useful info from reply
 169 
 170     msg_data = get_message_xml(reply, F_CRM_DATA);
 171     crm_element_value_ll(msg_data, XML_ATTR_TSTAMP, &value_ll);
 172 
 173     reply_data.reply_type = pcmk_pacemakerd_reply_ping;
 174     reply_data.data.ping.state =
 175         pcmk_pacemakerd_api_daemon_state_text2enum(
 176             crm_element_value(msg_data, XML_PING_ATTR_PACEMAKERDSTATE));
 177     reply_data.data.ping.status =
 178         pcmk__str_eq(crm_element_value(msg_data, XML_PING_ATTR_STATUS), "ok",
 179                      pcmk__str_casei)?pcmk_rc_ok:pcmk_rc_error;
 180     reply_data.data.ping.last_good = (time_t) value_ll;
 181     reply_data.data.ping.sys_from = crm_element_value(msg_data,
 182                                         XML_PING_ATTR_SYSFROM);
 183 
 184 done:
 185     pcmk__call_ipc_callback(api, pcmk_ipc_event_reply, status, &reply_data);
 186 }
 187 
 188 pcmk__ipc_methods_t *
 189 pcmk__pacemakerd_api_methods()
     /*  */
 190 {
 191     pcmk__ipc_methods_t *cmds = calloc(1, sizeof(pcmk__ipc_methods_t));
 192 
 193     if (cmds != NULL) {
 194         cmds->new_data = new_data;
 195         cmds->free_data = free_data;
 196         cmds->post_connect = post_connect;
 197         cmds->reply_expected = reply_expected;
 198         cmds->dispatch = dispatch;
 199         cmds->post_disconnect = post_disconnect;
 200     }
 201     return cmds;
 202 }
 203 
 204 int
 205 pcmk_pacemakerd_api_ping(pcmk_ipc_api_t *api, const char *ipc_name)
     /*  */
 206 {
 207     pacemakerd_api_private_t *private;
 208     xmlNode *cmd;
 209     int rc;
 210 
 211     CRM_CHECK(api != NULL, return -EINVAL);
 212     private = api->api_data;
 213     CRM_ASSERT(private != NULL);
 214 
 215     cmd = create_request(CRM_OP_PING, NULL, NULL, CRM_SYSTEM_MCP,
 216         ipc_name?ipc_name:((crm_system_name? crm_system_name : "client")),
 217         private->client_uuid);
 218 
 219     if (cmd) {
 220         rc = pcmk__send_ipc_request(api, cmd);
 221         if (rc != pcmk_rc_ok) {
 222             crm_debug("Couldn't ping pacemakerd: %s rc=%d",
 223                 pcmk_rc_str(rc), rc);
 224             rc = ECOMM;
 225         }
 226         free_xml(cmd);
 227     } else {
 228         rc = ENOMSG;
 229     }
 230 
 231     return rc;
 232 }
/* */
root/lib/common/ipc_pacemakerd.c

DEFINITIONS
