diff options
| author | Daniel Borkmann <dborkman@redhat.com> | 2013-04-09 09:51:26 +0200 |
|---|---|---|
| committer | Daniel Borkmann <dborkman@redhat.com> | 2013-04-09 09:51:26 +0200 |
| commit | a4703f2a060a81397da497b85bc135187f0f89e9 (patch) | |
| tree | dbae97c2ec9e0b74fa85e06ccdc18e3f6197b515 /pcap_sg.c | |
| parent | 5be3139e456d85b18e166643ce1636b0ecdbccc3 (diff) | |
pcap_io: introduce init_once helper that is called with priviledges
When using netsniff-ng with dropping priviledges, we have to introduce
another pcap helper function that is called once before we drop the
priviledges. In this function we have to invoke the disc I/O scheduler
policy, because it needs priviledges. Otherwise netsniff-ng will fail
with "Failed to set io prio for pid" on startup, since we're not root
anymore.
Reported-by: Doug Burks <doug.burks@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Diffstat (limited to 'pcap_sg.c')
| -rw-r--r-- | pcap_sg.c | 8 |
1 files changed, 6 insertions, 2 deletions
@@ -146,6 +146,11 @@ static void pcap_sg_fsync(int fd) fdatasync(fd); } +static void pcap_sg_init_once(void) +{ + set_ioprio_rt(); +} + static int pcap_sg_prepare_access(int fd, enum pcap_mode mode, bool jumbo) { int i, ret; @@ -160,8 +165,6 @@ static int pcap_sg_prepare_access(int fd, enum pcap_mode mode, bool jumbo) iov[i].iov_len = len; } - set_ioprio_rt(); - if (mode == PCAP_MODE_RD) { ret = readv(fd, iov, array_size(iov)); if (ret <= 0) @@ -183,6 +186,7 @@ static void pcap_sg_prepare_close(int fd, enum pcap_mode mode) } const struct pcap_file_ops pcap_sg_ops = { + .init_once_pcap = pcap_sg_init_once, .pull_fhdr_pcap = pcap_generic_pull_fhdr, .push_fhdr_pcap = pcap_generic_push_fhdr, .prepare_access_pcap = pcap_sg_prepare_access, |