node/publish.c

   1 #include <avahi-client/publish.h>
   2 #include <avahi-client/lookup.h>
   3
   4 #include <avahi-common/alternative.h>
   5 #include <avahi-common/simple-watch.h>
   6 #include <avahi-common/malloc.h>
   7 #include <avahi-common/error.h>
   8 #include <avahi-common/timeval.h>
   9 #include <avahi-common/strlst.h>
  10
  11 #include <libvirt/libvirt.h>
  12
  13 #include "node.h"
  14
  15 struct list_el {
  16     unsigned int domainid;
  17     AvahiEntryGroup *group;
  18     unsigned short keep;
  19 };
  20
  21 typedef struct list_el domu;
  22
  23 domu * domus = NULL; /* list of domains */
  24 unsigned int domu_count = 0;
  25
  26
  27 static AvahiStringList * domainProperties(virDomainPtr thisDomain) {
  28     AvahiStringList *new = NULL;
  29     // avahi_string_list_new_from_array (NULL, 0);
  30     virDomainInfo info;
  31     virDomainInterfaceStatsStruct stats;
  32     virDomainGetInfo(thisDomain, &info);
  33     new = avahi_string_list_add_printf(new, "maxMem=%lu", info.maxMem);
  34     new = avahi_string_list_add_printf(new, "memory=%lu", info.memory);
  35     new = avahi_string_list_add_printf(new, "cpuTime=%llu", info.cpuTime);
  36
  37     /* TODO: multiple network interfaces :( */
  38     char vifname[16];
  39     snprintf(vifname, 14, "vif%d.0", virDomainGetID(thisDomain));
  40     vifname[15] = '\0';
  41     unsigned int no = 0;
  42
  43     virDomainInterfaceStats(thisDomain, vifname, &stats, sizeof(stats));
  44
  45     new = avahi_string_list_add_printf(new, "interfaces=eth%d", no);
  46     new = avahi_string_list_add_printf(new, "interface_eth%d_rxbytes=%lld",   no, stats.rx_bytes);
  47     new = avahi_string_list_add_printf(new, "interface_eth%d_rxpackets=%lld", no, stats.rx_packets);
  48 //    new = avahi_string_list_add_printf(new, "interface_eth%d_rxerrs=%lld",    no, stats.rx_errs);
  49 //    new = avahi_string_list_add_printf(new, "interface_eth%d_rxdrop=%lld",    no, stats.rx_drop);
  50     new = avahi_string_list_add_printf(new, "interface_eth%d_txbytes=%lld",   no, stats.tx_bytes);
  51     new = avahi_string_list_add_printf(new, "interface_eth%d_txpackets=%lld", no, stats.tx_packets);
  52 //    new = avahi_string_list_add_printf(new, "interface_eth%d_txerrs=%lld",    no, stats.tx_errs);
  53 //    new = avahi_string_list_add_printf(new, "interface_eth%d_txdrop=%lld",    no, stats.tx_drop);
  54
  55     return new;
  56 }
  57
  58 void remove_everything() {
  59     if (domus) {
  60         int i;
  61         for (i = 0; i < domu_count; i++) {
  62             avahi_entry_group_free(domus[i].group);
  63             domus[i].group = NULL;
  64         }
  65         free(domus);
  66         domus = NULL;
  67         domu_count = 0;
  68     }
  69 }
  70
  71
  72 void create_services(AvahiClient *c) {
  73     virConnectPtr conn = virConnectOpenReadOnly(NULL);
  74     if (conn == NULL)
  75         return;
  76     int maxid = virConnectNumOfDomains(conn);
  77     if (maxid > 1) { /* ignore dom0 */
  78         int *ids = (int *) malloc(sizeof(int) * maxid);
  79         if ((maxid = virConnectListDomains(conn, &ids[0], maxid)) < 0) {
  80             // error
  81         } else {
  82             int i;
  83             unsigned int domu_count_new = (maxid - 1);
  84             domu * domus_old = domus;
  85             domus = (domu *) malloc(sizeof(domu) * domu_count_new);
  86             const char *type = "_domu._tcp";
  87
  88             for (i = 0; i < domu_count_new; i++) {
  89                 int j;
  90                 domus[i].group = NULL;
  91                 domus[i].domainid = ids[i+1];
  92                 domus[i].keep = 0;
  93
  94 //                fprintf(stderr, "Looking for %d\n", domus[i].domainid);
  95
  96                 for (j = 0; j < domu_count; j++) {
  97 //                    fprintf(stderr, "--> %d\n", domus_old[j].domainid);
  98                     if (ids[i+1] == domus_old[j].domainid) {
  99 //                        fprintf(stderr, "got it\n");
 100                         virDomainPtr thisDomain = virDomainLookupByID(conn, domus[i].domainid);
 101                         if (thisDomain) {
 102                             const char *name;
 103                             name = virDomainGetName(thisDomain);
 104                             if (name) {
 105                                 domus[i].group = domus_old[j].group;
 106                                 AvahiStringList *domainProps;
 107                                 domainProps = domainProperties(thisDomain);
 108                                 domus_old[j].keep = 1;
 109                                 avahi_entry_group_update_service_txt_strlst(domus[i].group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, domainProps);
 110                                 avahi_string_list_free(domainProps);
 111                             }
 112                             virDomainFree(thisDomain);
 113                         }
 114                     }
 115                 }
 116                 if (i > domu_count || domus[i].group == NULL) {
 117                     const char *name;
 118                     AvahiStringList *domainProps;
 119                     virDomainPtr thisDomain = virDomainLookupByID(conn, ids[i+1]);
 120                     if (thisDomain) {
 121                         domus[i].group = avahi_entry_group_new(c, entry_group_callback, NULL);
 122                         domainProps = domainProperties(thisDomain);
 123                         name = virDomainGetName(thisDomain);
 124
 125                         if (name) {
 126                             avahi_entry_group_add_service_strlst(domus[i].group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, NULL, 651, domainProps);
 127                             avahi_entry_group_commit(domus[i].group);
 128                         } else {
 129                             domus[i].keep = 0;
 130                         }
 131
 132                         avahi_string_list_free(domainProps);
 133                         virDomainFree(thisDomain);
 134                     }
 135                 }
 136             }
 137
 138             for (i = 0; i < domu_count; i++) {
 139                 // fprintf(stderr, "id: %d, keep: %d\n", domus_old[i].domainid, domus_old[i].keep);
 140                 if (domus_old[i].keep == 0 && domus_old[i].group != NULL) {
 141                     avahi_entry_group_free(domus_old[i].group);
 142                     domus_old[i].group = NULL;
 143                 }
 144             }
 145
 146             free(domus_old);
 147             domu_count = domu_count_new;
 148         }
 149         free(ids);
 150     } else {
 151         remove_everything();
 152     }
 153     virConnectClose(conn);
 154     //fprintf(stderr, "exit: %s\n", __func__);
 155 }
 156