By querying the driver for the path of the leases file for the given virtual network and parsing it to retrieve info. src/network/bridge_driver.c: * Implement networkGetDHCPLeases * Implement networkGetDHCPLeasesForMAC * Implement networkGetDHCPLeasesHelper --- src/network/bridge_driver.c | 177 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c index 3a8be90..f5adb97 100644 --- a/src/network/bridge_driver.c +++ b/src/network/bridge_driver.c @@ -109,6 +109,21 @@ static int networkPlugBandwidth(virNetworkObjPtr net, virDomainNetDefPtr iface); static int networkUnplugBandwidth(virNetworkObjPtr net, virDomainNetDefPtr iface); +/** + * VIR_NETWORK_DHCP_LEASE_LENGTH_MAX: + * + * Macro providing the maximum length of an entry in the leases file + * Refer: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2013q3/007402.html + */ +#define VIR_NETWORK_DHCP_LEASE_LENGTH_MAX 2048 + +/** + * VIR_NETWORK_DHCPLEASE_PARAMS: + * + * Macro providing the maximum number of parameters in an entry in + * the leases file + */ +#define VIR_NETWORK_DHCP_LEASE_FIELDS 5 static virNetworkDriverStatePtr driverState = NULL; @@ -2980,6 +2995,166 @@ cleanup: return ret; } +/* This function parese the leases file of dnsmasq. + * + * An example of leases file content: + * + * 1379024255 52:54:00:20:70:3d 192.168.105.240 * * + * 1379023351 52:54:00:b1:70:19 192.168.105.201 * * + */ +static int +networkGetDHCPLeasesHelper(virNetworkPtr network, + virNetworkObjPtr obj, + const char *mac, + virNetworkDHCPLeasesPtr **leases) +{ + int rv = -1; + size_t i = 0; + size_t nleases = 0; + char *leasefile; + char **lease_fields; + char dhcpentry[VIR_NETWORK_DHCP_LEASE_LENGTH_MAX]; + virNetworkDHCPLeasesPtr *leases_ret = NULL; + FILE *fp = NULL; + + if (!network) { + virReportError(VIR_ERR_NO_NETWORK, "%s", + _("no network with matching name")); + return -1; + } + + /* Retrieve leases file location */ + leasefile = networkDnsmasqLeaseFileNameDefault(network->name); + if (!(fp = fopen(leasefile, "r"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Unable to open leases file: %s"), leasefile); + goto cleanup; + } + + while (fgets(dhcpentry, sizeof(dhcpentry), fp) != NULL) { + virNetworkDHCPLeasesPtr lease = NULL; + + /* Remove newline */ + dhcpentry[strlen(dhcpentry) - 1] = '\0'; + + /* Split the lease line */ + lease_fields = virStringSplit(dhcpentry, " ", VIR_NETWORK_DHCP_LEASE_FIELDS); + + if (virStringListLength(lease_fields) != VIR_NETWORK_DHCP_LEASE_FIELDS) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Number of lease params aren't equal to: %d"), + VIR_NETWORK_DHCP_LEASE_FIELDS); + goto error; + } + + if (mac && STRNEQ(mac, lease_fields[1])) + continue; + + if (VIR_EXPAND_N(leases_ret, nleases, 1) < 0) + goto error; + + if (VIR_ALLOC(leases_ret[nleases - 1]) < 0) + goto error; + + lease = leases_ret[nleases - 1]; + + /* Convert expirytime here */ + if (virStrToLong_ll(lease_fields[0], NULL, 10, &(lease->expirytime)) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Unable to convert lease expiry time to integer: %s"), + lease_fields[0]); + goto error; + } + + /* Hardcoded, as dnsmasq uses ipv4 */ + lease->type = VIR_IP_ADDR_TYPE_IPV4; + lease->prefix = virSocketAddrGetIpPrefix(&obj->def->ips->address, + &obj->def->ips->netmask, + obj->def->ips->prefix); + + if ((VIR_STRDUP(lease->mac, lease_fields[1]) < 0) || + (VIR_STRDUP(lease->ipaddr, lease_fields[2]) < 0) || + (VIR_STRDUP(lease->hostname, lease_fields[3]) < 0) || + (VIR_STRDUP(lease->clientid, lease_fields[4]) < 0)) + goto error; + } + + if (mac && !leases_ret) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("no lease with matching MAC address: %s"), mac); + goto error; + } + + if (leases_ret) { + /* NULL terminated array */ + ignore_value(VIR_REALLOC_N(leases_ret, nleases + 1)); + *leases = leases_ret; + leases_ret = NULL; + rv = nleases; + } + +cleanup: + VIR_FORCE_FCLOSE(fp); + VIR_FREE(leasefile); + return rv; + +error: + if (leases_ret) { + for (i = 0; i < nleases; i++) + virNetworkDHCPLeaseFree(leases_ret[i]); + } + VIR_FREE(leases_ret); + goto cleanup; +} + +static int +networkGetDHCPLeases(virNetworkPtr network, + virNetworkDHCPLeasesPtr **leases, + unsigned int flags) +{ + int rv = -1; + virNetworkObjPtr obj; + + virCheckFlags(0, -1); + + if (!(obj = networkObjFromNetwork(network))) + return rv; + + if (virNetworkGetDHCPLeasesEnsureACL(network->conn, obj->def) < 0) + goto cleanup; + + rv = networkGetDHCPLeasesHelper(network, obj, NULL, leases); + +cleanup: + if (obj) + virNetworkObjUnlock(obj); + return rv; +} + +static int +networkGetDHCPLeasesForMAC(virNetworkPtr network, + const char *mac, + virNetworkDHCPLeasesPtr **leases, + unsigned int flags) +{ + int rv = -1; + virNetworkObjPtr obj; + + virCheckFlags(0, -1); + + if (!(obj = networkObjFromNetwork(network))) + return rv; + + if (virNetworkGetDHCPLeasesForMACEnsureACL(network->conn, obj->def) < 0) + goto cleanup; + + rv = networkGetDHCPLeasesHelper(network, obj, mac, leases); + +cleanup: + if (obj) + virNetworkObjUnlock(obj); + return rv; +} static virNetworkDriver networkDriver = { "Network", @@ -3004,6 +3179,8 @@ static virNetworkDriver networkDriver = { .networkSetAutostart = networkSetAutostart, /* 0.2.1 */ .networkIsActive = networkIsActive, /* 0.7.3 */ .networkIsPersistent = networkIsPersistent, /* 0.7.3 */ + .networkGetDHCPLeases = networkGetDHCPLeases, /* 1.1.3 */ + .networkGetDHCPLeasesForMAC = networkGetDHCPLeasesForMAC, /* 1.1.3 */ }; static virStateDriver networkStateDriver = { -- 1.7.11.7 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list