From: Vadim Kochan <vadi...@gmail.com>
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 <vadi...@gmail.com>
---
netsniff-ng.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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)
--
2.3.1
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