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[Qemu-devel] [PATCH] qemu-ga: Add guest-getip command
From: |
Michal Privoznik |
Subject: |
[Qemu-devel] [PATCH] qemu-ga: Add guest-getip command |
Date: |
Thu, 16 Feb 2012 18:25:03 +0100 |
This command returns an array of:
[ifname, ipaddr, ipaddr_family, prefix, hwaddr]
for each interface in the system that has an IP address.
Currently, only IPv4 and IPv6 are supported.
Signed-off-by: Michal Privoznik <address@hidden>
---
qapi-schema-guest.json | 16 +++++
qga/guest-agent-commands.c | 156 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 172 insertions(+), 0 deletions(-)
diff --git a/qapi-schema-guest.json b/qapi-schema-guest.json
index 5f8a18d..14de133 100644
--- a/qapi-schema-guest.json
+++ b/qapi-schema-guest.json
@@ -219,3 +219,19 @@
##
{ 'command': 'guest-fsfreeze-thaw',
'returns': 'int' }
+
+##
+# @guest-getip:
+#
+# Get list of guest IP addresses, MAC address
+# and netmasks
+#
+# Returns: List of GuestIFAddress
+#
+# Since: 1.1
+##
+{ 'type': 'GuestIFAddress',
+ 'data': {'iface': {'name': 'str', 'ipaddr': 'str', 'ipaddrtype': 'int',
+ 'prefix': 'int', 'hwaddr': 'str'} } }
+{ 'command': 'guest-getip',
+ 'returns': ['GuestIFAddress'] }
diff --git a/qga/guest-agent-commands.c b/qga/guest-agent-commands.c
index a09c8ca..4caffa7 100644
--- a/qga/guest-agent-commands.c
+++ b/qga/guest-agent-commands.c
@@ -5,6 +5,7 @@
*
* Authors:
* Michael Roth <address@hidden>
+ * Michal Privoznik <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
@@ -23,6 +24,10 @@
#include <sys/types.h>
#include <sys/ioctl.h>
+#include <ifaddrs.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <net/if.h>
#include "qga/guest-agent-core.h"
#include "qga-qmp-commands.h"
#include "qerror.h"
@@ -583,3 +588,154 @@ void ga_command_state_init(GAState *s, GACommandState *cs)
#endif
ga_command_state_add(cs, guest_file_init, NULL);
}
+
+/* Count the number of '1' bits in @x */
+static int32_t
+count_one_bits(uint32_t x)
+{
+ x = ((x & 0xaaaaaaaaU) >> 1) + (x & 0x55555555U);
+ x = ((x & 0xccccccccU) >> 2) + (x & 0x33333333U);
+ x = (x >> 16) + (x & 0xffff);
+ x = ((x & 0xf0f0) >> 4) + (x & 0x0f0f);
+ return (x >> 8) + (x & 0x00ff);
+}
+
+/*
+ * Get the list of interfaces among with their
+ * IP/MAC addresses, prefixes and IP versions
+ */
+GuestIFAddressList * qmp_guest_getip(Error **err)
+{
+ GuestIFAddressList *head = NULL, *cur_item = NULL;
+ struct ifaddrs *ifap = NULL, *ifa = NULL;
+ char err_msg[512];
+
+ slog("guest-getip called");
+
+ if (getifaddrs(&ifap) < 0) {
+ snprintf(err_msg, sizeof(err_msg),
+ "getifaddrs failed : %s", strerror(errno));
+ error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
+ goto cleanup;
+ }
+
+ ifa = ifap;
+ while (ifa) {
+ GuestIFAddressList *info = NULL;
+ char addr4[INET_ADDRSTRLEN];
+ char addr6[INET6_ADDRSTRLEN];
+ unsigned char *mac_addr;
+ void *tmpAddrPtr = NULL;
+ int sock, family;
+ int mac_supported;
+ struct ifreq ifr;
+
+ /* Step over interfaces without an address */
+ if (!ifa->ifa_addr)
+ continue;
+
+ g_debug("Processing %s interface", ifa->ifa_name);
+
+ family = ifa->ifa_addr->sa_family;
+
+ if (family == AF_INET) {
+ /* interface with IPv4 address */
+ tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
+ inet_ntop(AF_INET, tmpAddrPtr, addr4, sizeof(addr4));
+
+ info = g_malloc0(sizeof(*info));
+ info->value = g_malloc0(sizeof(*info->value));
+ info->value->iface.name = g_strdup(ifa->ifa_name);
+ info->value->iface.ipaddr = g_strdup(addr4);
+
+ /* This is safe as '1' and '0' cannot be shuffled in netmask. */
+ tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
+ info->value->iface.prefix = count_one_bits(((uint32_t *)
tmpAddrPtr)[0]);
+ } else if (family == AF_INET6) {
+ /* interface with IPv6 address */
+ tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
+ inet_ntop(AF_INET6, tmpAddrPtr, addr6, sizeof(addr6));
+
+ info = g_malloc0(sizeof(*info));
+ info->value = g_malloc0(sizeof(*info->value));
+ info->value->iface.name = g_strdup(ifa->ifa_name);
+ info->value->iface.ipaddr = g_strdup(addr6);
+
+ /* This is safe as '1' and '0' cannot be shuffled in netmask. */
+ tmpAddrPtr=&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
+ info->value->iface.prefix = count_one_bits(((uint32_t *)
tmpAddrPtr)[0]) +
+ count_one_bits(((uint32_t *) tmpAddrPtr)[1]) +
+ count_one_bits(((uint32_t *) tmpAddrPtr)[2]) +
+ count_one_bits(((uint32_t *) tmpAddrPtr)[3]);
+ }
+
+ /* Add new family here */
+
+ mac_supported = ifa->ifa_flags & SIOCGIFHWADDR;
+
+ ifa = ifa->ifa_next;
+
+ if (!info)
+ continue;
+
+ if (!cur_item) {
+ head = cur_item = info;
+ } else {
+ cur_item->next = info;
+ cur_item = info;
+ }
+
+ info->value->iface.ipaddrtype = family;
+
+ g_debug("Appending to return: iface=%s, ip=%s, type=%llu,
prefix=%llu",
+ info->value->iface.name,
+ info->value->iface.ipaddr,
+ (unsigned long long) info->value->iface.ipaddrtype,
+ (unsigned long long) info->value->iface.prefix);
+
+ /* If we can't get get MAC address on this interface,
+ * don't even try but continue to another interface */
+ if (!mac_supported)
+ continue;
+
+ sock = socket(PF_INET, SOCK_STREAM, 0);
+
+ if (sock == -1) {
+ snprintf(err_msg, sizeof(err_msg),
+ "failed to create socket: %s", strerror(errno));
+ error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
+ goto cleanup;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, info->value->iface.name, IF_NAMESIZE);
+ if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
+ snprintf(err_msg, sizeof(err_msg),
+ "failed to get MAC addres of %s: %s",
+ info->value->iface.name,
+ strerror(errno));
+ error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
+ goto cleanup;
+ }
+
+ mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
+
+ if (asprintf(&info->value->iface.hwaddr,
+ "%02x:%02x:%02x:%02x:%02x:%02x",
+ (int) mac_addr[0], (int) mac_addr[1],
+ (int) mac_addr[2], (int) mac_addr[3],
+ (int) mac_addr[4], (int) mac_addr[5]) == -1) {
+ snprintf(err_msg, sizeof(err_msg),
+ "failed to format MAC: %s", strerror(errno));
+ error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
+ goto cleanup;
+ }
+
+ close(sock);
+ }
+
+cleanup:
+ freeifaddrs(ifap);
+
+ return head;
+}
--
1.7.3.4
- [Qemu-devel] [PATCH] qemu-ga: Add guest-getip command,
Michal Privoznik <=