diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/monitor/monitor_netlink.c | 158 |
1 files changed, 155 insertions, 3 deletions
diff --git a/src/monitor/monitor_netlink.c b/src/monitor/monitor_netlink.c index cbf717fc..737266bf 100644 --- a/src/monitor/monitor_netlink.c +++ b/src/monitor/monitor_netlink.c @@ -24,6 +24,7 @@ #include <talloc.h> #include <tevent.h> #include <sys/types.h> +#include <sys/ioctl.h> #define __USE_GNU /* needed for struct ucred */ #include <sys/socket.h> #include <unistd.h> @@ -36,6 +37,7 @@ #include <linux/if.h> #include <linux/socket.h> #include <linux/rtnetlink.h> +#include <linux/wireless.h> #include <netlink/netlink.h> #include <netlink/utils.h> #include <netlink/route/addr.h> @@ -55,6 +57,14 @@ #define nlw_object_match nl_object_match_filter #define NLW_OK NL_OK +#define SYSFS_IFACE_TEMPLATE "/sys/class/net/%s/type" +#define SYSFS_IFACE_PATH_MAX (21+IFNAMSIZ) + +#define PHY_80211_SUBDIR "phy80211" +#define SYSFS_SUBDIR_PATH_MAX (SYSFS_IFACE_PATH_MAX+9) + +#define BUFSIZE 8 + struct netlink_ctx { #ifdef HAVE_LIBNL struct nl_handle *nlh; @@ -76,6 +86,141 @@ static int netlink_ctx_destructor(void *ptr) } /******************************************************************* + * Utility functions + *******************************************************************/ + +static bool has_wireless_extension(const char *ifname) +{ + int s; + errno_t ret; + struct iwreq iwr; + + s = socket(PF_INET, SOCK_DGRAM, 0); + if (s == -1) { + ret = errno; + DEBUG(2, ("Could not open socket: [%d] %s\n", ret, strerror(ret))); + return false; + } + + strncpy(iwr.ifr_ifrn.ifrn_name, ifname, IFNAMSIZ); + /* Does the interface support a wireless extension? */ + ret = ioctl(s, SIOCGIWNAME, &iwr); + close(s); + + return ret == 0; +} + +static bool has_ethernet_encapsulation(const char *sysfs_path) +{ + errno_t ret; + int fd = -1; + char buf[BUFSIZE]; + + fd = open(sysfs_path, O_RDONLY); + if (fd == -1) { + ret = errno; + DEBUG(SSSDBG_OP_FAILURE, ("Could not open sysfs file %s: [%d] %s\n", + sysfs_path, ret, strerror(ret))); + return false; + } + + memset(buf, 0, BUFSIZE); + while ((ret = read(fd, buf, BUFSIZE)) != 0) { + if (ret == -1) { + ret = errno; + if (ret == EINTR || ret == EAGAIN) { + continue; + } + DEBUG(SSSDBG_OP_FAILURE, + ("read failed [%d][%s].\n", ret, strerror(ret))); + close(fd); + return false; + } + } + close(fd); + + return strncmp(buf, "1\n", BUFSIZE) == 0; +} + +static bool has_phy_80211_subdir(const char *sysfs_path) +{ + char phy80211_path[SYSFS_IFACE_PATH_MAX]; + struct stat statbuf; + errno_t ret; + + ret = snprintf(phy80211_path, SYSFS_SUBDIR_PATH_MAX, + "%s/%s", sysfs_path, PHY_80211_SUBDIR); + if (ret < 0) { + DEBUG(SSSDBG_OP_FAILURE, ("snprintf failed")); + return false; + } else if (ret >= SYSFS_SUBDIR_PATH_MAX) { + DEBUG(SSSDBG_OP_FAILURE, ("path too long?!?!\n")); + return false; + } + + errno = 0; + ret = stat(phy80211_path, &statbuf); + if (ret == -1) { + ret = errno; + if (ret == ENOENT || ret == ENOTDIR) { + DEBUG(SSSDBG_TRACE_LIBS, ("No %s directory in sysfs, probably " + "not a wireless interface\n", PHY_80211_SUBDIR)); + } else { + DEBUG(SSSDBG_OP_FAILURE, ("stat failed: [%d] %s\n", + ret, strerror(ret))); + } + return false; + } + + if (statbuf.st_mode & S_IFDIR) { + DEBUG(SSSDBG_TRACE_LIBS, ("Directory %s found in sysfs, looks like " + "a wireless iface\n", PHY_80211_SUBDIR)); + return true; + } + + return false; +} + +static bool discard_iff_up(const char *ifname) +{ + char path[SYSFS_IFACE_PATH_MAX]; + errno_t ret; + + /* This catches most of the new 80211 drivers */ + if (has_wireless_extension(ifname)) { + DEBUG(SSSDBG_TRACE_FUNC, ("%s has a wireless extension\n", ifname)); + return true; + } + + ret = snprintf(path, SYSFS_IFACE_PATH_MAX, SYSFS_IFACE_TEMPLATE, ifname); + if (ret < 0) { + DEBUG(SSSDBG_OP_FAILURE, ("snprintf failed")); + return false; + } else if (ret >= SYSFS_IFACE_PATH_MAX) { + DEBUG(SSSDBG_OP_FAILURE, ("path too long?!?!\n")); + return false; + } + + /* This will filter PPP and such. Both wired and wireless + * interfaces have the encapsulation. */ + if (!has_ethernet_encapsulation(path)) { + DEBUG(SSSDBG_TRACE_FUNC, ("%s does not have ethernet encapsulation, " + "filtering out\n", ifname)); + return true; + } + + /* This captures old WEXT drivers, the new mac8011 would + * be caught by the ioctl check */ + if (has_phy_80211_subdir(path)) { + DEBUG(SSSDBG_TRACE_FUNC, ("%s has a 802_11 subdir, filtering out\n", + ifname)); + return true; + } + + return false; +} + +/******************************************************************* * Wrappers for different capabilities of different libnl versions *******************************************************************/ @@ -237,8 +382,10 @@ static void link_msg_handler(struct nl_object *obj, void *arg) { struct netlink_ctx *ctx = (struct netlink_ctx *) arg; struct rtnl_link *link_obj; - int flags; + unsigned int flags; + char str_flags[512]; int ifidx; + const char *ifname; if (!nlw_is_link_object(obj)) return; @@ -246,10 +393,15 @@ static void link_msg_handler(struct nl_object *obj, void *arg) flags = rtnl_link_get_flags(link_obj); ifidx = rtnl_link_get_ifindex(link_obj); - DEBUG(8, ("netlink link message: iface idx %d flags 0x%X\n", ifidx, flags)); + rtnl_link_flags2str(flags, str_flags, 512); + + ifname = rtnl_link_get_name(link_obj); + DEBUG(SSSDBG_TRACE_LIBS, ("netlink link message: iface idx %u (%s) " + "flags 0x%X (%s)\n", ifidx, ifname, flags, str_flags)); /* IFF_LOWER_UP is the indicator of carrier status */ - if (flags & IFF_LOWER_UP) { + if ((flags & IFF_RUNNING) && (flags & IFF_LOWER_UP) && + !discard_iff_up(ifname)) { ctx->change_cb(ctx->cb_data); } } |