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authorTom Gundersen <teg@jklm.no>2015-06-11 11:34:54 +0200
committerTom Gundersen <teg@jklm.no>2015-06-11 16:14:59 +0200
commit2ce8483538887f7d64d3ae5afe03b72c34210b20 (patch)
tree6214c85e23ed71d4c08926bc472b530e219c1d6f /src/libsystemd
parent4aa2764cade3e6d5233f2e390d64931d5cff1410 (diff)
sd-rtnl: use netlink header rather than ucred in socket_recv_message()
Lets us simplify the function and drop SO_PASSCRED. Thanks to Alexander Larsson and David Herrmann.
Diffstat (limited to 'src/libsystemd')
-rw-r--r--src/libsystemd/sd-rtnl/rtnl-message.c48
-rw-r--r--src/libsystemd/sd-rtnl/sd-rtnl.c4
2 files changed, 21 insertions, 31 deletions
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index 9dcf7df559..79e67f6953 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -24,6 +24,7 @@
#include <unistd.h>
#include "util.h"
+#include "socket-util.h"
#include "formats-util.h"
#include "refcnt.h"
#include "missing.h"
@@ -1415,17 +1416,18 @@ int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
}
static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) {
- uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) +
- CMSG_SPACE(sizeof(struct nl_pktinfo))];
+ union sockaddr_union sender;
+ uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))];
struct msghdr msg = {
.msg_iov = iov,
.msg_iovlen = 1,
- .msg_control = cred_buffer,
- .msg_controllen = sizeof(cred_buffer),
+ .msg_name = &sender,
+ .msg_namelen = sizeof(sender),
+ .msg_control = cmsg_buffer,
+ .msg_controllen = sizeof(cmsg_buffer),
};
struct cmsghdr *cmsg;
uint32_t group = 0;
- bool auth = false;
int r;
assert(fd >= 0);
@@ -1442,29 +1444,10 @@ static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool
return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
}
- CMSG_FOREACH(cmsg, &msg) {
- if (cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SCM_CREDENTIALS &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
- struct ucred *ucred = (void *)CMSG_DATA(cmsg);
-
- /* from the kernel */
- if (ucred->pid == 0)
- auth = true;
- else
- log_debug("rtnl: ignoring message from PID "PID_FMT, ucred->pid);
- } else if (cmsg->cmsg_level == SOL_NETLINK &&
- cmsg->cmsg_type == NETLINK_PKTINFO &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) {
- struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg);
-
- /* multi-cast group */
- group = pktinfo->group;
- }
- }
-
- if (!auth) {
+ if (sender.nl.nl_pid != 0) {
/* not from the kernel, ignore */
+ log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid);
+
if (peek) {
/* drop the message */
r = recvmsg(fd, &msg, 0);
@@ -1475,6 +1458,17 @@ static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool
return 0;
}
+ CMSG_FOREACH(cmsg, &msg) {
+ if (cmsg->cmsg_level == SOL_NETLINK &&
+ cmsg->cmsg_type == NETLINK_PKTINFO &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) {
+ struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg);
+
+ /* multi-cast group */
+ group = pktinfo->group;
+ }
+ }
+
if (_group)
*_group = group;
diff --git a/src/libsystemd/sd-rtnl/sd-rtnl.c b/src/libsystemd/sd-rtnl/sd-rtnl.c
index 40dea1252f..ae9a40c0fe 100644
--- a/src/libsystemd/sd-rtnl/sd-rtnl.c
+++ b/src/libsystemd/sd-rtnl/sd-rtnl.c
@@ -136,10 +136,6 @@ static int rtnl_open_fd_ap(sd_rtnl **ret, int fd, unsigned n_groups, va_list ap)
if (r < 0)
return r;
- r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
- if (r < 0)
- return -errno;
-
r = setsockopt(fd, SOL_NETLINK, NETLINK_PKTINFO, &one, sizeof(one));
if (r < 0)
return -errno;