From a4703f2a060a81397da497b85bc135187f0f89e9 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Tue, 9 Apr 2013 09:51:26 +0200 Subject: 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 Signed-off-by: Daniel Borkmann --- pcap_rw.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'pcap_rw.c') diff --git a/pcap_rw.c b/pcap_rw.c index 22d613f..4d95c47 100644 --- a/pcap_rw.c +++ b/pcap_rw.c @@ -57,11 +57,9 @@ static ssize_t pcap_rw_read(int fd, pcap_pkthdr_t *phdr, enum pcap_type type, return hdrsize + hdrlen; } -static int pcap_rw_prepare_access(int fd, enum pcap_mode mode, bool jumbo) +static void pcap_rw_init_once(void) { set_ioprio_rt(); - - return 0; } static void pcap_rw_fsync(int fd) @@ -70,9 +68,9 @@ static void pcap_rw_fsync(int fd) } const struct pcap_file_ops pcap_rw_ops = { + .init_once_pcap = pcap_rw_init_once, .pull_fhdr_pcap = pcap_generic_pull_fhdr, .push_fhdr_pcap = pcap_generic_push_fhdr, - .prepare_access_pcap = pcap_rw_prepare_access, .read_pcap = pcap_rw_read, .write_pcap = pcap_rw_write, .fsync_pcap = pcap_rw_fsync, -- cgit v1.2.3-54-g00ecf