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Pau Espin Pedrol gerrit-no-reply at lists.osmocom.orgPau Espin Pedrol has uploaded this change for review. ( https://gerrit.osmocom.org/11264 Change subject: client: Set snaplen to MAXIMUM_SNAPLEN ...................................................................... client: Set snaplen to MAXIMUM_SNAPLEN Despite this value not being exported publicly, the truth is that tcpdump and wireshark nowadays avoid processing any file with snaplen bigger than this value: "tcpdump: pcap_loop: invalid packet capture length 861244, bigger than snaplen of 262144" It also fails to set snaplen to values bigger than that: "tcpdump -s 262145" --> "tcpdump: invalid snaplen 262145" pcapfix also warns about wrong packet length if bigger than same value (defined as PCAP_MAX_SNAPLEN there). MAXIMUM_SPANPLEN is defined in tcpdump's netdissect.h and libpcap's pcap-int.h. It is also defined as WTAP_MAX_PACKET_SIZE in wireshark/wiretap/wtap.h (this one being the only publicly available). Change-Id: Ib7449d5aba9da342c150704ebd0e1f09e7f7276c --- M src/osmo_client_network.c 1 file changed, 6 insertions(+), 1 deletion(-) git pull ssh://gerrit.osmocom.org:29418/osmo-pcap refs/changes/64/11264/1 diff --git a/src/osmo_client_network.c b/src/osmo_client_network.c index ec03b09..6b84337 100644 --- a/src/osmo_client_network.c +++ b/src/osmo_client_network.c @@ -42,6 +42,11 @@ #include <string.h> #include <unistd.h> +/* defined in libpcap's pcap-int.h, which is not public */ +#ifndef MAXIMUM_SNAPLEN +#define MAXIMUM_SNAPLEN 262144 +#endif + static void _osmo_client_connect(void *_data) { @@ -257,7 +262,7 @@ hdr->version_minor = 4; hdr->thiszone = 0; hdr->sigfigs = 0; - hdr->snaplen = UINT_MAX; + hdr->snaplen = MAXIMUM_SNAPLEN; hdr->linktype = pcap_datalink(conn->client->handle); write_data(conn, msg); -- To view, visit https://gerrit.osmocom.org/11264 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-pcap Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: Ib7449d5aba9da342c150704ebd0e1f09e7f7276c Gerrit-Change-Number: 11264 Gerrit-PatchSet: 1 Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20181008/0366b90f/attachment.htm>