diff options
| author | Vadim Kochan <vadim4j@gmail.com> | 2015-05-07 08:48:19 +0300 |
|---|---|---|
| committer | Tobias Klauser <tklauser@distanz.ch> | 2015-05-07 12:00:07 +0200 |
| commit | f6d211974eff4ba67461262031af54fdb4f54210 (patch) | |
| tree | 74dbca2eedda4ac963c3ee5b312654aca9ff7571 /netsniff-ng.c | |
| parent | 096b043a8581ad43f030323a69b4e6c6e78530fa (diff) | |
netsniff-ng: Open pcap w/o O_NOATIME on 2nd try
If the file open fails with O_NOATIME option then try to open it w/o
this option in case if the user does not have enough prvileges to use
O_NOATIME.
It fixes the case when user made pcap file in sudo mode but after it
should still use sudo to read it because of setting O_NOATIME option
requires higher privileges.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'netsniff-ng.c')
| -rw-r--r-- | netsniff-ng.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/netsniff-ng.c b/netsniff-ng.c index dfab81a..d6782ac 100644 --- a/netsniff-ng.c +++ b/netsniff-ng.c @@ -570,7 +570,12 @@ static void read_pcap(struct ctx *ctx) if (ctx->pcap == PCAP_OPS_MM) ctx->pcap = PCAP_OPS_SG; } else { - fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME); + fd = open(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME); + if (fd < 0 && errno == EPERM) + fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE); + if (fd < 0) + panic("Cannot open file %s! %s.\n", ctx->device_in, + strerror(errno)); } if (__pcap_io->init_once_pcap) |