trafgen: Dump proto headers in *.cfg format

Added trafgen_dump.c module which dumps headers from packet
in .cfg format. Packet is dumped if -o <file>.cfg was specified,
it might be useful to specify *.pcap file as input and convert it
into .cfg file to edit proto fields in human readable format.

To make it possible several main changes were added:

    1) packet id is embedded into struct packet.id, and
       it is updated on each realloc_packet()

    2) Added new struct proto_hdr.get_next_proto callback
       to make possible apply fields of next header.

    3) Added new dev_io ops for writting packets into .cfg file,
       to re-use common dev_io mechsnism for packets dumping.

Before dump the default ETH_PROTO fields are applied as first header and
then next proto_hdr is identified via .get_next_proto(...) callback.

Meanwhile only eth, arp, vlan, ip4, udp, & tcp protos can be dissected
into *.cfg format.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 27 insertions, 27 deletions

diff --git a/trafgen.c b/trafgen.c
index 97ac046..9b54399 100644
--- a/trafgen.c
+++ b/trafgen.c
@@ -185,31 +185,31 @@ static void __noreturn help(void)
 	puts("http://www.netsniff-ng.org\n\n"
 	     "Usage: trafgen [options] [packet]\n"
 	     "Options:\n"
-	     "  -i|-c|--in|--conf <cfg/->      Packet configuration file/stdin\n"
-	     "  -o|-d|--out|--dev <netdev>     Networking device i.e., eth0\n"
-	     "  -p|--cpp                       Run packet config through C preprocessor\n"
-	     "  -D|--define                    Add macro/define for C preprocessor\n"
-	     "  -J|--jumbo-support             Support 64KB super jumbo frames (def: 2048B)\n"
-	     "  -R|--rfraw                     Inject raw 802.11 frames\n"
-	     "  -s|--smoke-test <ipv4>         Probe if machine survived fuzz-tested packet\n"
-	     "  -n|--num <uint>                Number of packets until exit (def: 0)\n"
-	     "  -r|--rand                      Randomize packet selection (def: round robin)\n"
-	     "  -P|--cpus <uint>               Specify number of forks(<= CPUs) (def: #CPUs)\n"
-	     "  -t|--gap <time>                Set approx. interpacket gap (s/ms/us/ns, def: us)\n"
-	     "  -b|--rate <rate>               Send traffic at specified rate (pps/B/kB/MB/GB/kbit/Mbit/Gbit/KiB/MiB/GiB)\n"
-	     "  -S|--ring-size <size>          Manually set mmap size (KiB/MiB/GiB)\n"
-	     "  -E|--seed <uint>               Manually set srand(3) seed\n"
-	     "  -u|--user <userid>             Drop privileges and change to userid\n"
-	     "  -g|--group <groupid>           Drop privileges and change to groupid\n"
-	     "  -H|--prio-high                 Make this high priority process\n"
-	     "  -A|--no-sock-mem               Don't tune core socket memory\n"
-	     "  -Q|--notouch-irq               Do not touch IRQ CPU affinity of NIC\n"
-	     "  -q|--qdisc-path                Enable qdisc kernel path (default off since 3.14)\n"
-	     "  -V|--verbose                   Be more verbose\n"
-	     "  -C|--no-cpu-stats              Do not print CPU time statistics on exit\n"
-	     "  -v|--version                   Show version and exit\n"
-	     "  -e|--example                   Show built-in packet config example\n"
-	     "  -h|--help                      Guess what?!\n\n"
+	     "  -i|-c|--in|--conf <cfg/->             Packet configuration file/stdin\n"
+	     "  -o|-d|--out|--dev <netdev|.cfg|.pcap> Networking device or configuration file i.e., eth0\n"
+	     "  -p|--cpp                              Run packet config through C preprocessor\n"
+	     "  -D|--define                           Add macro/define for C preprocessor\n"
+	     "  -J|--jumbo-support                    Support 64KB super jumbo frames (def: 2048B)\n"
+	     "  -R|--rfraw                            Inject raw 802.11 frames\n"
+	     "  -s|--smoke-test <ipv4>                Probe if machine survived fuzz-tested packet\n"
+	     "  -n|--num <uint>                       Number of packets until exit (def: 0)\n"
+	     "  -r|--rand                             Randomize packet selection (def: round robin)\n"
+	     "  -P|--cpus <uint>                      Specify number of forks(<= CPUs) (def: #CPUs)\n"
+	     "  -t|--gap <time>                       Set approx. interpacket gap (s/ms/us/ns, def: us)\n"
+	     "  -b|--rate <rate>                      Send traffic at specified rate (pps/B/kB/MB/GB/kbit/Mbit/Gbit/KiB/MiB/GiB)\n"
+	     "  -S|--ring-size <size>                 Manually set mmap size (KiB/MiB/GiB)\n"
+	     "  -E|--seed <uint>                      Manually set srand(3) seed\n"
+	     "  -u|--user <userid>                    Drop privileges and change to userid\n"
+	     "  -g|--group <groupid>                  Drop privileges and change to groupid\n"
+	     "  -H|--prio-high                        Make this high priority process\n"
+	     "  -A|--no-sock-mem                      Don't tune core socket memory\n"
+	     "  -Q|--notouch-irq                      Do not touch IRQ CPU affinity of NIC\n"
+	     "  -q|--qdisc-path                       Enable qdisc kernel path (default off since 3.14)\n"
+	     "  -V|--verbose                          Be more verbose\n"
+	     "  -C|--no-cpu-stats                     Do not print CPU time statistics on exit\n"
+	     "  -v|--version                          Show version and exit\n"
+	     "  -e|--example                          Show built-in packet config example\n"
+	     "  -h|--help                             Guess what?!\n\n"
 	     "Examples:\n"
 	     "  trafgen --dev eth0 --conf trafgen.cfg\n"
 	     "  trafgen -e | trafgen -i - -o eth0 --cpp -n 1\n"
@@ -1284,8 +1284,8 @@ int main(int argc, char **argv)
 
 	protos_init(ctx.dev_out);
 
-	if (shaper_is_set(&ctx.sh) || (ctx.dev_in && dev_io_is_pcap(ctx.dev_in))
-	    || dev_io_is_pcap(ctx.dev_out)) {
+	if (shaper_is_set(&ctx.sh) || (ctx.dev_in && !dev_io_is_netdev(ctx.dev_in))
+	    || !dev_io_is_netdev(ctx.dev_out)) {
 
 		prctl(PR_SET_TIMERSLACK, 1UL);
 		/* Fall back to single core to not mess up correct timing.