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e1_input: Allow to change the pcap fd and/or unset it 

This will update the pcap fd in all open lines and close
the previous one (if applicable).

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: I5c7dd740ba0a90b40c69a53b3dcc9d6d6a98f660
This commit is contained in:
Sylvain Munaut 2020-05-08 09:40:44 +02:00
parent 73a73c0381
commit 4b45e9d1a6
1 changed files with 27 additions and 2 deletions
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29
src/e1_input.c
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@ -142,7 +142,7 @@ static int pcap_fd = -1;
int e1_set_pcap_fd(int fd)
{
struct pcap_hdr header = {
const struct pcap_hdr header = {
.magic_number = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
@ -151,9 +151,34 @@ int e1_set_pcap_fd(int fd)
.snaplen = 65535,
.network = DLT_LINUX_LAPD,
};
struct e1inp_line *line;
int i;
/* write header */
if (fd >= 0) {
int rc = write(fd, &header, sizeof(header));
if (rc < 0)
return rc;
}
/* update fd in all lines in our global list of e1 lines */
llist_for_each_entry(line, &e1inp_line_list, list) {
/* Set the PCAP file descriptor for all timeslots that have
* software LAPD instances, to ensure the osmo_lapd_pcap code is
* used to write PCAP files (if requested) */
for (i = 0; i < ARRAY_SIZE(line->ts); i++) {
struct e1inp_ts *e1i_ts = &line->ts[i];
if (e1i_ts->lapd)
e1i_ts->lapd->pcap_fd = fd;
}
}
/* close previous and update global */
if (pcap_fd >= 0)
close(pcap_fd);
pcap_fd = fd;
return write(pcap_fd, &header, sizeof(header));
return 0;
}
/* This currently only works for the D-Channel */