/**
* \brief Specifies an interface to use for sending.
*
* You may call this up to two (2) times with different interfaces
* when using a tcpprep cache file or dualfile mode. Note, both interfaces
* must use the same DLT type
*/
int
tcpreplay_set_interface(tcpreplay_t *ctx, tcpreplay_intf intf, char *value)
{
static int int1dlt = -1, int2dlt = -1;
char *intname;
char ebuf[SENDPACKET_ERRBUF_SIZE];
assert(ctx);
assert(value);
if (intf == intf1) {
if ((intname = get_interface(ctx->intlist, value)) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", value);
return -1;
}
ctx->options->intf1_name = safe_strdup(intname);
/* open interfaces for writing */
if ((ctx->intf1 = sendpacket_open(ctx->options->intf1_name, ebuf, TCPR_DIR_C2S)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", ctx->options->intf1_name, ebuf);
return -1;
}
int1dlt = sendpacket_get_dlt(ctx->intf1);
} else if (intf == intf2) {
if ((intname = get_interface(ctx->intlist, value)) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", ctx->options->intf2_name);
return -1;
}
ctx->options->intf2_name = safe_strdup(intname);
/* open interface for writing */
if ((ctx->intf2 = sendpacket_open(ctx->options->intf2_name, ebuf, TCPR_DIR_S2C)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", ctx->options->intf2_name, ebuf);
return -1;
}
int2dlt = sendpacket_get_dlt(ctx->intf2);
}
/*
* If both interfaces are selected, then make sure both interfaces use
* the same DLT type
*/
if (int1dlt != -1 && int2dlt != -1) {
if (int1dlt != int2dlt) {
tcpreplay_seterr(ctx, "DLT type missmatch for %s (%s) and %s (%s)",
ctx->options->intf1_name, pcap_datalink_val_to_name(int1dlt),
ctx->options->intf2_name, pcap_datalink_val_to_name(int2dlt));
return -1;
}
}
return 0;
}
/**
* \brief Does all the prep work before calling tcpreplay_replay()
*
* Technically this validates our config options, preloads the tcpprep
* cache file, loads the packet cache and anything else which might
* cause a delay for starting to send packets with tcpreplay_replay()
*/
int
tcpreplay_prepare(tcpreplay_t *ctx)
{
char *intname, ebuf[SENDPACKET_ERRBUF_SIZE];
int int1dlt, int2dlt, i;
assert(ctx);
/*
* First, process the validations, basically the same we do in
* tcpreplay_post_args() and AutoOpts
*/
if (ctx->options->intf1_name == NULL) {
tcpreplay_seterr(ctx, "%s", "You must specify at least one network interface");
return -1;
}
if (ctx->options->source_cnt == 0) {
tcpreplay_seterr(ctx, "%s", "You must specify at least one source pcap");
return -1;
}
if (ctx->options->dualfile) {
if (! ctx->options->source_cnt >= 2) {
tcpreplay_seterr(ctx, "%s", "Dual file mode requires 2 or more pcap files");
return -1;
}
if (ctx->options->source_cnt % 2 != 0) {
tcpreplay_seterr(ctx, "%s", "Dual file mode requires an even number of pcap files");
return -1;
}
}
if (ctx->options->dualfile && ctx->options->cachedata != NULL) {
tcpreplay_seterr(ctx, "%s", "Can't use dual file mode and tcpprep cache file together");
return -1;
}
if ((ctx->options->dualfile || ctx->options->cachedata != NULL) &&
ctx->options->intf2_name == NULL) {
tcpreplay_seterr(ctx, "%s", "dual file mode and tcpprep cache files require two interfaces");
}
#ifndef HAVE_SELECT
if (ctx->options->accurate == accurate_select) {
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with select support");
return -1;
}
#endif
#ifndef HAVE_RDTSC
if (ctx->options->accurate == accurate_rdtsc) {
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with rdtsc support");
return -1;
}
#else
if (ctx->options->rdtsc_clicks > 0)
rdtsc_calibrate(ctx->options->rdtsc_clicks);
#endif
#ifndef HAVE_IOPERM
if (ctx->options->accurate == accurate_ioport) {
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with IO Port 0x80 support");
return -1;
}
#else
if (ctx->options->accurate == accurate_ioport) {
ioport_sleep_init();
}
#endif
#ifndef HAVE_ABSOLUTE_TIME
if (ctx->options->accurate == accurate_abs_time) {
tcpreplay_seterr(ctx, "%s", "tcpreplay_api only supports absolute time on Apple OS X");
return -1;
}
#endif
if ((intname = get_interface(ctx->intlist, ctx->options->intf1_name)) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", OPT_ARG(INTF1));
return -1;
}
/* open interfaces for writing */
if ((ctx->intf1 = sendpacket_open(ctx->options->intf1_name, ebuf, TCPR_DIR_C2S)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", ctx->options->intf1_name, ebuf);
return -1;
}
int1dlt = sendpacket_get_dlt(ctx->intf1);
if (ctx->options->intf2_name != NULL) {
if ((intname = get_interface(ctx->intlist, ctx->options->intf2_name)) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", OPT_ARG(INTF2));
return -1;
}
/* open interfaces for writing */
if ((ctx->intf2 = sendpacket_open(ctx->options->intf2_name, ebuf, TCPR_DIR_C2S)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", ctx->options->intf2_name, ebuf);
return -1;
}
int2dlt = sendpacket_get_dlt(ctx->intf2);
if (int2dlt != int1dlt) {
tcpreplay_seterr(ctx, "DLT type missmatch for %s (%s) and %s (%s)",
ctx->options->intf1_name, pcap_datalink_val_to_name(int1dlt),
ctx->options->intf2_name, pcap_datalink_val_to_name(int2dlt));
return -1;
}
}
/*
* Setup up the file cache, if required
*/
if (ctx->options->enable_file_cache && ctx->options->file_cache == NULL) {
/* Initialise each of the file cache structures */
for (i = 0; i < ctx->options->source_cnt; i++) {
ctx->options->file_cache[i].index = i;
ctx->options->file_cache[i].cached = FALSE;
ctx->options->file_cache[i].packet_cache = NULL;
}
}
return 0;
}
void
post_args(_U_ int argc, _U_ char *argv[])
{
char ebuf[SENDPACKET_ERRBUF_SIZE];
struct tcpr_ether_addr *eth_buff;
char *intname;
sendpacket_t *sp;
#ifdef ENABLE_PCAP_FINDALLDEVS
interface_list_t *intlist = get_interface_list();
#else
interface_list_t *intlist = NULL;
#endif
#ifdef DEBUG
if (HAVE_OPT(DBUG))
debug = OPT_VALUE_DBUG;
#else
if (HAVE_OPT(DBUG))
warn("not configured with --enable-debug. Debugging disabled.");
#endif
#ifdef ENABLE_VERBOSE
if (HAVE_OPT(VERBOSE))
options.verbose = 1;
if (HAVE_OPT(DECODE))
options.tcpdump->args = safe_strdup(OPT_ARG(DECODE));
#endif
if (HAVE_OPT(UNIDIR))
options.unidir = 1;
if (HAVE_OPT(LIMIT))
options.limit_send = OPT_VALUE_LIMIT; /* default is -1 */
if ((intname = get_interface(intlist, OPT_ARG(INTF1))) == NULL)
errx(-1, "Invalid interface name/alias: %s", OPT_ARG(INTF1));
options.intf1 = safe_strdup(intname);
if (HAVE_OPT(INTF2)) {
if ((intname = get_interface(intlist, OPT_ARG(INTF2))) == NULL)
errx(-1, "Invalid interface name/alias: %s", OPT_ARG(INTF2));
options.intf2 = safe_strdup(intname);
}
if (HAVE_OPT(MAC)) {
int ct = STACKCT_OPT(MAC);
char **list = STACKLST_OPT(MAC);
int first = 1;
do {
char *p = *list++;
if (first)
mac2hex(p, (u_char *)options.intf1_mac, ETHER_ADDR_LEN);
else
mac2hex(p, (u_char *)options.intf2_mac, ETHER_ADDR_LEN);
first = 0;
} while (--ct > 0);
}
/*
* Figure out MAC addresses of sending interface(s)
* if user doesn't specify MAC address on CLI, query for it
*/
if (memcmp(options.intf1_mac, "\00\00\00\00\00\00", ETHER_ADDR_LEN) == 0) {
if ((sp = sendpacket_open(NULL, options.intf1, ebuf, TCPR_DIR_C2S)) == NULL)
errx(-1, "Unable to open interface %s: %s", options.intf1, ebuf);
if ((eth_buff = sendpacket_get_hwaddr(sp)) == NULL) {
warnx("Unable to get MAC address: %s", sendpacket_geterr(sp));
err(-1, "Please consult the man page for using the -M option.");
}
sendpacket_close(sp);
memcpy(options.intf1_mac, eth_buff, ETHER_ADDR_LEN);
}
if (memcmp(options.intf2_mac, "\00\00\00\00\00\00", ETHER_ADDR_LEN) == 0) {
if ((sp = sendpacket_open(NULL, options.intf2, ebuf, TCPR_DIR_S2C)) == NULL)
errx(-1, "Unable to open interface %s: %s", options.intf2, ebuf);
if ((eth_buff = sendpacket_get_hwaddr(sp)) == NULL) {
warnx("Unable to get MAC address: %s", sendpacket_geterr(sp));
err(-1, "Please consult the man page for using the -M option.");
}
sendpacket_close(sp);
memcpy(options.intf2_mac, eth_buff, ETHER_ADDR_LEN);
}
/*
* Open interfaces for sending & receiving
*/
if ((options.pcap1 = pcap_open_live(options.intf1, options.snaplen,
options.promisc, options.to_ms, ebuf)) == NULL)
errx(-1, "Unable to open interface %s: %s", options.intf1, ebuf);
if (strcmp(options.intf1, options.intf2) == 0)
errx(-1, "Whoa tiger! You don't want to use %s twice!", options.intf1);
/* we always have to open the other pcap handle to send, but we may not listen */
if ((options.pcap2 = pcap_open_live(options.intf2, options.snaplen,
options.promisc, options.to_ms, ebuf)) == NULL)
errx(-1, "Unable to open interface %s: %s", options.intf2, ebuf);
/* poll should be -1 to wait indefinitely */
options.poll_timeout = -1;
}
/**
* \brief Parses the GNU AutoOpts options for tcpreplay
*
* If you're using AutoOpts with tcpreplay_api, then just call this after
* optionProcess() and it will parse all the options for you. As always,
* returns 0 on success, and -1 on error & -2 on warning.
*/
int
tcpreplay_post_args(tcpreplay_t *ctx, int argc)
{
char *temp, *intname;
char ebuf[SENDPACKET_ERRBUF_SIZE];
int int1dlt, int2dlt;
tcpreplay_opt_t *options;
int warn = 0;
#ifdef USE_AUTOOPTS
options = ctx->options;
#ifdef DEBUG
if (HAVE_OPT(DBUG))
debug = OPT_VALUE_DBUG;
#else
if (HAVE_OPT(DBUG)) {
warn ++;
tcpreplay_setwarn(ctx, "%s", "not configured with --enable-debug. Debugging disabled.");
}
#endif
options->loop = OPT_VALUE_LOOP;
options->sleep_accel = OPT_VALUE_SLEEP_ACCEL;
if (HAVE_OPT(LIMIT))
options->limit_send = OPT_VALUE_LIMIT;
if (HAVE_OPT(TOPSPEED)) {
options->speed.mode = speed_topspeed;
options->speed.speed = 0.0;
} else if (HAVE_OPT(PPS)) {
options->speed.mode = speed_packetrate;
options->speed.speed = (float)OPT_VALUE_PPS;
options->speed.pps_multi = OPT_VALUE_PPS_MULTI;
} else if (HAVE_OPT(ONEATATIME)) {
options->speed.mode = speed_oneatatime;
options->speed.speed = 0.0;
} else if (HAVE_OPT(MBPS)) {
options->speed.mode = speed_mbpsrate;
options->speed.speed = atof(OPT_ARG(MBPS));
} else if (HAVE_OPT(MULTIPLIER)) {
options->speed.mode = speed_multiplier;
options->speed.speed = atof(OPT_ARG(MULTIPLIER));
}
#ifdef ENABLE_VERBOSE
if (HAVE_OPT(VERBOSE))
options->verbose = 1;
if (HAVE_OPT(DECODE))
options->tcpdump->args = safe_strdup(OPT_ARG(DECODE));
#endif
if (HAVE_OPT(STATS))
options->stats = OPT_VALUE_STATS;
/*
* Check if the file cache should be enabled - if we're looping more than
* once and the command line option has been spec'd
*/
if (HAVE_OPT(ENABLE_FILE_CACHE) && (options->loop != 1)) {
options->enable_file_cache = true;
}
/*
* If we're preloading the pcap before the first run, then
* we're forcing the file cache to be true
*/
if (HAVE_OPT(PRELOAD_PCAP)) {
options->preload_pcap = true;
options->enable_file_cache = true;
}
/* Dual file mode */
if (HAVE_OPT(DUALFILE)) {
options->dualfile = true;
if (argc < 2) {
tcpreplay_seterr(ctx, "%s", "--dualfile mode requires at least two pcap files");
return -1;
}
if (argc % 2 != 0) {
tcpreplay_seterr(ctx, "%s", "--dualfile mode requires an even number of pcap files");
return -1;
}
}
if (HAVE_OPT(TIMER)) {
if (strcmp(OPT_ARG(TIMER), "select") == 0) {
#ifdef HAVE_SELECT
options->accurate = accurate_select;
#else
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with select support");
return -1;
#endif
} else if (strcmp(OPT_ARG(TIMER), "rdtsc") == 0) {
#ifdef HAVE_RDTSC
options->accurate = accurate_rdtsc;
#else
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with rdtsc support");
return -1;
#endif
} else if (strcmp(OPT_ARG(TIMER), "ioport") == 0) {
#if defined HAVE_IOPERM && defined(__i386__)
options->accurate = accurate_ioport;
ioport_sleep_init();
#else
tcpreplay_seterr(ctx, "%s", "tcpreplay_api not compiled with IO Port 0x80 support");
return -1;
#endif
} else if (strcmp(OPT_ARG(TIMER), "gtod") == 0) {
options->accurate = accurate_gtod;
} else if (strcmp(OPT_ARG(TIMER), "nano") == 0) {
options->accurate = accurate_nanosleep;
} else if (strcmp(OPT_ARG(TIMER), "abstime") == 0) {
#ifdef HAVE_ABSOLUTE_TIME
options->accurate = accurate_abs_time;
if (!MPLibraryIsLoaded()) {
tcpreplay_seterr(ctx, "%s", "The MP library did not load.\n");
return -1;
}
#else
tcpreplay_seterr(ctx, "%s", "tcpreplay_api only supports absolute time on Apple OS X");
return -1;
#endif
} else {
tcpreplay_seterr(ctx, "Unsupported timer mode: %s", OPT_ARG(TIMER));
return -1;
}
}
#ifdef HAVE_RDTSC
if (HAVE_OPT(RDTSC_CLICKS)) {
rdtsc_calibrate(OPT_VALUE_RDTSC_CLICKS);
}
#endif
if (HAVE_OPT(PKTLEN)) {
options->use_pkthdr_len = true;
warn ++;
tcpreplay_setwarn(ctx, "%s", "--pktlen may cause problems. Use with caution.");
}
if ((intname = get_interface(ctx->intlist, OPT_ARG(INTF1))) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", OPT_ARG(INTF1));
return -1;
}
options->intf1_name = safe_strdup(intname);
/* open interfaces for writing */
if ((ctx->intf1 = sendpacket_open(options->intf1_name, ebuf, TCPR_DIR_C2S)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", options->intf1_name, ebuf);
return -1;
}
int1dlt = sendpacket_get_dlt(ctx->intf1);
if (HAVE_OPT(INTF2)) {
if ((intname = get_interface(ctx->intlist, OPT_ARG(INTF2))) == NULL) {
tcpreplay_seterr(ctx, "Invalid interface name/alias: %s", OPT_ARG(INTF2));
return -1;
}
options->intf2_name = safe_strdup(intname);
/* open interface for writing */
if ((ctx->intf2 = sendpacket_open(options->intf2_name, ebuf, TCPR_DIR_S2C)) == NULL) {
tcpreplay_seterr(ctx, "Can't open %s: %s", options->intf2_name, ebuf);
}
int2dlt = sendpacket_get_dlt(ctx->intf2);
if (int2dlt != int1dlt) {
tcpreplay_seterr(ctx, "DLT type missmatch for %s (%s) and %s (%s)",
options->intf1_name, pcap_datalink_val_to_name(int1dlt),
options->intf2_name, pcap_datalink_val_to_name(int2dlt));
return -1;
}
}
if (HAVE_OPT(CACHEFILE)) {
temp = safe_strdup(OPT_ARG(CACHEFILE));
options->cache_packets = read_cache(&options->cachedata, temp,
&options->comment);
safe_free(temp);
}
/* return -2 on warnings */
if (warn > 0)
return -2;
return 0;
#else
tcpreplay_seterr(ctx, "autopts support not compiled in. tcpreplay_post_args() not supported");
return -1;
#endif /* USE_AUTOOPTS */
}
/**
* This is the main function of the program that handles calling other
* functions to implemented the needed operations of the replay functionaily.
*/
int
main(int argc, char **argv)
{
unsigned int k;
unsigned int num_packets=0;
char port_mode[10]; /* does user specify random port generation?*/
char random_strg[7] = "random";
char* iface = argv[1];
char* new_rmac_ptr;
char* new_rip_ptr;
in_addr new_remoteip;
struct mac_addr new_remotemac;
in_addr myip;
struct mac_addr mymac;
/*temporary packet buffers*/
unsigned int new_src_port = 0;
unsigned int retransmissions = 0;
pcap_t *local_handle;
char errbuf[PCAP_ERRBUF_SIZE];
char ebuf[SENDPACKET_ERRBUF_SIZE];
optionProcess(&tcpliveplayOptions, argc, argv); /*Process AutoOpts for manpage options*/
if((argc < 5) || (argv[1]==NULL) || (argv[2]==NULL) || (argv[3]==NULL) || (argv[4]==NULL) || (argv[5]==NULL)) {
printf("ERROR: Incorrect Usage!\n");
printf("Usage: tcpliveplay <eth0/eth1> <file.pcap> <Destinatin IP [1.2.3.4]> <Destination mac [0a:1b:2c:3d:4e:5f]> <specify 'random' or specific port#>\n");
printf("Example:\n yhsiam@yhsiam-VirtualBox:~$ sudo tcpliveplay eth0 test1.pcap 192.168.1.4 52:57:01:11:31:92 random\n\n");
exit(0);
}
iface_addrs(iface, &myip, &mymac); /* Extract MAC of interface replay is being request on */
/* open send function socket*/
if ((sp = sendpacket_open(iface, ebuf, TCPR_DIR_C2S, SP_TYPE_NONE)) == NULL)
errx(-1, "Can't open %s: %s", argv[1], ebuf);
/* random dport vs. specified dport operation*/
strcpy(port_mode, argv[5]);
/*for(int i = 0; i<10; i++) tolower(port_mode[i]);*/
if(strcmp(port_mode, random_strg)==0) {
new_src_port = random_port();
} else new_src_port = atoi(argv[5]);
/*else {
printf("Port specification error. Please specify 'random' for random source port generation between 49152 and 65535 OR specifiy a specific source port number.\n");
return;
}*/
printf("new source port:: %d\n", new_src_port);
/* Establish a handler for SIGALRM signals. */
/* This is used as timeout for unresponsive remote hosts */
signal (SIGALRM, catch_alarm);
/* Extract new Remote MAC & IP inputted at command line */
new_rmac_ptr= argv[4];
new_rip_ptr = argv[3];
/* These function setup the MAC & IP addresses in the mac_addr & in_addr structs */
extmac(new_rmac_ptr, &new_remotemac);
extip(new_rip_ptr, &new_remoteip);
/* Rewrites the given "*.pcap" file with all the new parameters and returns the number of packets */
/* that need to be replayed */
num_packets = rewrite(&new_remoteip, &new_remotemac, &myip, &mymac, argv[2], new_src_port);
/* create schedule & set it up */
sched = (struct tcp_sched*) malloc(num_packets*sizeof(struct tcp_sched));
pkts_scheduled = setup_sched(sched); /* Returns number of packets in schedule*/
/* Set up the schedule struct to be relative numbers rather than absolute*/
relative_sched(sched, sched[1].exp_rseq, num_packets);
printf("Packets Scheduled %d\n", pkts_scheduled);
/* Open socket for savedfile traffic to be sent*/
local_handle = pcap_open_offline("newfile.pcap", errbuf); /*call pcap library function*/
if (local_handle == NULL) {
fprintf(stderr,"Couldn't open pcap file %s: %s\n", "newfile.pcap", errbuf);
return(2);
}
/* Open socket for live traffic to be listed to*/
live_handle = set_live_filter(iface, &myip, new_src_port); /* returns a pcap_t that filters out traffic other than TCP*/
if (live_handle == NULL) {
fprintf(stderr,"Error occured while listing on traffic: %s\n", errbuf);
return(2);
}
/* Printout when no packets are scheduled */
if(pkts_scheduled==0) {
printf("\n+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
printf("+ ERROR:: There are no TCP packets to sent +\n");
printf("+ Closing replay... +\n");
printf("+ Thank you for Playing, Play again! +\n");
printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
return ERROR;
}
/* Start replay by sending the first packet, the SYN, from the schedule */
else if(sched[0].local) { /* Send first packet*/
sendpacket(sp, sched[sched_index].packet_ptr, sched[sched_index].pkthdr.len, &sched[sched_index].pkthdr);
printf("Sending Local Packet............... [%d]\n",sched_index+1);
sched_index++; /* Proceed in the schedule */
}
/* Main while loop that handles the decision making and the replay oprations */
while(sched_index<pkts_scheduled) {
if(!keep_going) { /*Check the timeout variable */
printf("\n======================================================================\n");
printf("= TIMEOUT:: Remote host is not responding. You may have crashed =\n");
printf("= the host you replayed these packets against OR the packet sequence =\n");
printf("= changed since the capture was taken resulting in differing =\n");
printf("= expectations. Closing replay... =\n");
printf("======================================================================\n\n");
break;
}
/* tcphdr_rprev carries the last remote tcp header */
if(tcphdr_rprev == NULL) {
//printf("FIRST PASS!\n");
}
/* Check if received RST or RST-ACK flagged packets*/
else if((tcphdr_rprev->th_flags==TH_RST) || (tcphdr_rprev->th_flags==(TH_RST|TH_ACK))) {
printf("\n++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
printf("+ ERROR:: Remote host has requested to RESET the connection. +\n");
printf("+ Closing replay... +\n");
printf("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
break;
}
/*Check if received earlier FIN-ACK than expected
else if((sched_index-1 < finack_rindex) && (tcphdr_rprev->th_flags==(TH_FIN|TH_ACK))){
printf("\n++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
printf("+ ERROR:: Remote host sent an earlier FIN-ACK than expected. +\n");
printf("+ Closing replay... +\n");
printf("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
return;
} */
/* Do the following if we receive a packet that ACKs for the same ACKing of next packet */
else if((tcphdr_rprev->th_seq==htonl(sched[sched_index].exp_rseq)) && (tcphdr_rprev->th_ack==htonl(sched[sched_index].exp_rack)) && (size_payload_prev>0)) {
printf("Received Remote Packet............... [%d]\n",sched_index+1);
printf("Skipping Packet...................... [%d] to Packet [%d]\n",sched_index+1, sched_index+2);
printf("Next Remote Packet Expectation met.\nProceeding in replay...\n");
sched_index++;
}
/* Do the following if payload does not meet expectation and re-attempt with the remote host for 3 tries*/
else if(different_payload) {
printf("\n+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
printf("+ WARNING: Remote host is not meeting packet size expectations. +\n");
printf("+ for packet %-d. Application layer data differs from capture being replayed. +\n", diff_payload_index+1);
printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
printf("Requesting retransmission.\n Proceeding...\n");
different_payload = false;
}
/* Local Packets */
if(sched[sched_index].local) {
/*Reset alarm timeout*/
alarm (ALARM_TIMEOUT);
printf("Sending Local Packet............... [%d]\n",sched_index+1);
/* edit each packet tcphdr before sending based on the schedule*/
if(sched_index>0) {
sched[sched_index].tcphdr->th_ack = htonl(sched[sched_index].curr_lack);
fix_all_checksum_liveplay(sched[sched_index].iphdr);
}
/* If 3 attempts of resending was made, then error out to the user */
if(sched[sched_index].sent_counter==3) {
printf("\n++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
printf("+ ERROR: Re-sent packet [%-d] 3 times, but remote host is not +\n", sched_index+1);
printf("+ responding as expected. 3 resend attempts are a maximum. +\n");
printf("+ Closing replay... +\n");
printf("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
break;
}
/* If nothing goes wrong, then send the packet scheduled to be sent, then proceed in the schedule */
sendpacket(sp, sched[sched_index].packet_ptr, sched[sched_index].pkthdr.len, &sched[sched_index].pkthdr);
sched[sched_index].sent_counter++; /* Keep track of how many times this specific packet was attempted */
sched_index++; /* proceed */
}
/* Remote Packets */
else if(sched[sched_index].remote) {
alarm (ALARM_TIMEOUT);
printf("Receiving Packets from remote host...\n");
pcap_dispatch(live_handle, 1, got_packet, NULL); /* Listen in on NIC for tcp packets */
//printf("pcap_loop returned\n");
}
} /* end of main while loop*/
pcap_breakloop(live_handle);
pcap_close(live_handle);
sendpacket_close(sp); /* Close Send socket*/
remove("newfile.pcap"); /* Remote the rewritten file that was created*/
for(k=0; k<pkts_scheduled; k++) {
retransmissions+=sched[k].sent_counter;
}
/* User Debug Result Printouts*/
if(sched_index==pkts_scheduled) {
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
printf("~ CONGRATS!!! You have successfully Replayed your pcap file '%s' \n", argv[2]);
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n");
}
else {
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
printf("~ Unfortunately an error has occurred halting the replay of \n");
printf("~ the pcap file '%s'. Please see error above for details... \n", argv[2]);
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n");
}
printf("----------------TCP Live Play Summary----------------\n");
printf("- Packets Scheduled to be Sent & Received: %-d \n", pkts_scheduled);
printf("- Actual Packets Sent & Received: %-d \n", sched_index);
printf("- Total Local Packet Re-Transmissions due to packet \n");
printf("- loss and/or differing payload size than expected: %-d \n", retransmissions);
printf("- Thank you for Playing, Play again! \n");
printf("----------------------------------------------------------\n\n");
return 0;
}