X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibudev%2Flibudev-monitor.c;h=4cfb2f617cfe908a17519e0fc832e4bd0575ee1d;hb=1fa2f38f0f011010bf57522b42fcc168856a7003;hp=186e5e1e87360e46ce458331138fa9686c7a5db7;hpb=e6c474723dc66cd4765fd09453d6b48bd5905ba4;p=elogind.git diff --git a/src/libudev/libudev-monitor.c b/src/libudev/libudev-monitor.c index 186e5e1e8..4cfb2f617 100644 --- a/src/libudev/libudev-monitor.c +++ b/src/libudev/libudev-monitor.c @@ -109,10 +109,7 @@ static struct udev_monitor *udev_monitor_new(struct udev *udev) /* we consider udev running when /dev is on devtmpfs */ static bool udev_has_devtmpfs(struct udev *udev) { - union file_handle_union h = { - .handle.handle_bytes = MAX_HANDLE_SZ - }; - + union file_handle_union h = FILE_HANDLE_INIT; _cleanup_fclose_ FILE *f = NULL; char line[LINE_MAX], *e; int mount_id; @@ -121,7 +118,7 @@ static bool udev_has_devtmpfs(struct udev *udev) { r = name_to_handle_at(AT_FDCWD, "/dev", &h.handle, &mount_id, 0); if (r < 0) { if (errno != EOPNOTSUPP) - udev_err(udev, "name_to_handle_at on /dev: %m\n"); + log_debug_errno(errno, "name_to_handle_at on /dev: %m"); return false; } @@ -174,7 +171,7 @@ struct udev_monitor *udev_monitor_new_from_netlink_fd(struct udev *udev, const c * will not receive any messages. */ if (access("/run/udev/control", F_OK) < 0 && !udev_has_devtmpfs(udev)) { - udev_dbg(udev, "the udev service seems not to be active, disable the monitor\n"); + log_debug("the udev service seems not to be active, disable the monitor"); group = UDEV_MONITOR_NONE; } else group = UDEV_MONITOR_UDEV; @@ -190,7 +187,7 @@ struct udev_monitor *udev_monitor_new_from_netlink_fd(struct udev *udev, const c if (fd < 0) { udev_monitor->sock = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_KOBJECT_UEVENT); if (udev_monitor->sock == -1) { - udev_err(udev, "error getting socket: %m\n"); + log_debug_errno(errno, "error getting socket: %m"); free(udev_monitor); return NULL; } @@ -407,12 +404,15 @@ _public_ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor) if (err == 0) udev_monitor->snl.nl.nl_pid = snl.nl.nl_pid; } else { - udev_err(udev_monitor->udev, "bind failed: %m\n"); + log_debug_errno(errno, "bind failed: %m"); return -errno; } /* enable receiving of sender credentials */ - setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); + err = setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); + if (err < 0) + log_debug_errno(errno, "setting SO_PASSCRED failed: %m"); + return 0; } @@ -579,7 +579,10 @@ _public_ struct udev_device *udev_monitor_receive_device(struct udev_monitor *ud struct cmsghdr *cmsg; union sockaddr_union snl; struct ucred *cred; - char buf[8192]; + union { + struct udev_monitor_netlink_header nlh; + char raw[8192]; + } buf; ssize_t buflen; ssize_t bufpos; @@ -599,12 +602,12 @@ retry: buflen = recvmsg(udev_monitor->sock, &smsg, 0); if (buflen < 0) { if (errno != EINTR) - udev_dbg(udev_monitor->udev, "unable to receive message\n"); + log_debug("unable to receive message"); return NULL; } - if (buflen < 32 || (size_t)buflen >= sizeof(buf)) { - udev_dbg(udev_monitor->udev, "invalid message length\n"); + if (buflen < 32 || (smsg.msg_flags & MSG_TRUNC)) { + log_debug("invalid message length"); return NULL; } @@ -612,26 +615,26 @@ retry: /* unicast message, check if we trust the sender */ if (udev_monitor->snl_trusted_sender.nl.nl_pid == 0 || snl.nl.nl_pid != udev_monitor->snl_trusted_sender.nl.nl_pid) { - udev_dbg(udev_monitor->udev, "unicast netlink message ignored\n"); + log_debug("unicast netlink message ignored"); return NULL; } } else if (snl.nl.nl_groups == UDEV_MONITOR_KERNEL) { if (snl.nl.nl_pid > 0) { - udev_dbg(udev_monitor->udev, "multicast kernel netlink message from pid %d ignored\n", - snl.nl.nl_pid); + log_debug("multicast kernel netlink message from PID %"PRIu32" ignored", + snl.nl.nl_pid); return NULL; } } cmsg = CMSG_FIRSTHDR(&smsg); if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { - udev_dbg(udev_monitor->udev, "no sender credentials received, message ignored\n"); + log_debug("no sender credentials received, message ignored"); return NULL; } cred = (struct ucred *)CMSG_DATA(cmsg); if (cred->uid != 0) { - udev_dbg(udev_monitor->udev, "sender uid=%d, message ignored\n", cred->uid); + log_debug("sender uid="UID_FMT", message ignored", cred->uid); return NULL; } @@ -639,38 +642,35 @@ retry: if (udev_device == NULL) return NULL; - if (memcmp(buf, "libudev", 8) == 0) { - struct udev_monitor_netlink_header *nlh; - + if (memcmp(buf.raw, "libudev", 8) == 0) { /* udev message needs proper version magic */ - nlh = (struct udev_monitor_netlink_header *) buf; - if (nlh->magic != htonl(UDEV_MONITOR_MAGIC)) { - udev_err(udev_monitor->udev, "unrecognized message signature (%x != %x)\n", - nlh->magic, htonl(UDEV_MONITOR_MAGIC)); + if (buf.nlh.magic != htonl(UDEV_MONITOR_MAGIC)) { + log_debug("unrecognized message signature (%x != %x)", + buf.nlh.magic, htonl(UDEV_MONITOR_MAGIC)); udev_device_unref(udev_device); return NULL; } - if (nlh->properties_off+32 > (size_t)buflen) { + if (buf.nlh.properties_off+32 > (size_t)buflen) { udev_device_unref(udev_device); return NULL; } - bufpos = nlh->properties_off; + bufpos = buf.nlh.properties_off; /* devices received from udev are always initialized */ udev_device_set_is_initialized(udev_device); } else { /* kernel message with header */ - bufpos = strlen(buf) + 1; + bufpos = strlen(buf.raw) + 1; if ((size_t)bufpos < sizeof("a@/d") || bufpos >= buflen) { - udev_dbg(udev_monitor->udev, "invalid message length\n"); + log_debug("invalid message length"); udev_device_unref(udev_device); return NULL; } /* check message header */ - if (strstr(buf, "@/") == NULL) { - udev_dbg(udev_monitor->udev, "unrecognized message header\n"); + if (strstr(buf.raw, "@/") == NULL) { + log_debug("unrecognized message header"); udev_device_unref(udev_device); return NULL; } @@ -682,7 +682,7 @@ retry: char *key; size_t keylen; - key = &buf[bufpos]; + key = &buf.raw[bufpos]; keylen = strlen(key); if (keylen == 0) break; @@ -691,7 +691,7 @@ retry: } if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) { - udev_dbg(udev_monitor->udev, "missing values, invalid device\n"); + log_debug("missing values, invalid device"); udev_device_unref(udev_device); return NULL; } @@ -775,7 +775,7 @@ int udev_monitor_send_device(struct udev_monitor *udev_monitor, smsg.msg_name = &udev_monitor->snl_destination; smsg.msg_namelen = sizeof(struct sockaddr_nl); count = sendmsg(udev_monitor->sock, &smsg, 0); - udev_dbg(udev_monitor->udev, "passed %zi bytes to netlink monitor %p\n", count, udev_monitor); + log_debug("passed %zi bytes to netlink monitor %p", count, udev_monitor); return count; }