Add tcp-mss support.
--- a/main.c
+++ b/main.c
@@ -44,7 +44,8 @@
signlen,
lsr_length = 0,
ssr_length = 0,
- tcp_ack;
+ tcp_ack,
+ tcp_mss;
unsigned short int
@@ -95,6 +96,7 @@
opt_tcpexitcode = FALSE,
opt_badcksum = FALSE,
opt_tr_keep_ttl = FALSE,
+ opt_tcp_mss = FALSE,
opt_tcp_timestamp = FALSE,
opt_tr_stop = FALSE,
opt_tr_no_rtt = FALSE,
--- a/globals.h
+++ b/globals.h
@@ -32,7 +32,8 @@
tcp_seqnum,
set_ack,
ip_header_length,
- tcp_ack;
+ tcp_ack,
+ tcp_mss;
extern unsigned short int
data_size;
@@ -77,6 +78,7 @@
opt_tcpexitcode,
opt_badcksum,
opt_tr_keep_ttl,
+ opt_tcp_mss,
opt_tcp_timestamp,
opt_tr_stop,
opt_tr_no_rtt,
--- a/parseoptions.c
+++ b/parseoptions.c
@@ -31,7 +31,7 @@
OPT_RROUTE, OPT_IPPROTO, OPT_ICMP_IPVER, OPT_ICMP_IPHLEN,
OPT_ICMP_IPLEN, OPT_ICMP_IPID, OPT_ICMP_IPPROTO, OPT_ICMP_CKSUM,
OPT_ICMP_TS, OPT_ICMP_ADDR, OPT_TCPEXITCODE, OPT_FAST, OPT_TR_KEEP_TTL,
- OPT_TCP_TIMESTAMP, OPT_TR_STOP, OPT_TR_NO_RTT, OPT_ICMP_HELP,
+ OPT_TCP_TIMESTAMP, OPT_TCP_MSS, OPT_TR_STOP, OPT_TR_NO_RTT, OPT_ICMP_HELP,
OPT_RAND_DEST, OPT_RAND_SOURCE, OPT_LSRR, OPT_SSRR, OPT_ROUTE_HELP,
OPT_ICMP_IPSRC, OPT_ICMP_IPDST, OPT_ICMP_SRCPORT, OPT_ICMP_DSTPORT,
OPT_ICMP_GW, OPT_FORCE_ICMP, OPT_APD_SEND, OPT_SCAN, OPT_FASTER,
@@ -124,6 +124,7 @@
{ '\0', "force-icmp", OPT_FORCE_ICMP, AGO_NOARG },
{ '\0', "beep", OPT_BEEP, AGO_NOARG },
{ '\0', "flood", OPT_FLOOD, AGO_NOARG },
+ { '\0', "tcp-mss", OPT_TCP_MSS, AGO_NEEDARG|AGO_EXCEPT0 },
AGO_LIST_TERM
};
@@ -556,6 +557,10 @@
case OPT_FLOOD:
opt_flood = TRUE;
break;
+ case OPT_TCP_MSS:
+ opt_tcp_mss = TRUE;
+ tcp_mss = strtoul(ago_optarg, NULL, 0);
+ break;
}
}
--- a/usage.c
+++ b/usage.c
@@ -87,6 +87,7 @@
" -X --xmas set X unused flag (0x40)\n"
" -Y --ymas set Y unused flag (0x80)\n"
" --tcpexitcode use last tcp->th_flags as exit code\n"
+" --tcp-mss enable the TCP MSS option with the given value\n"
" --tcp-timestamp enable the TCP timestamp option to guess the HZ/uptime\n"
"Common\n"
" -d --data data size (default is 0)\n"
--- a/sendtcp.c
+++ b/sendtcp.c
@@ -28,10 +28,12 @@
char *packet, *data;
struct mytcphdr *tcp;
struct pseudohdr *pseudoheader;
- unsigned char *tstamp;
+ unsigned char *opts;
+ if (opt_tcp_mss)
+ tcp_opt_size += 4;
if (opt_tcp_timestamp)
- tcp_opt_size = 12;
+ tcp_opt_size += 12;
packet_size = TCPHDR_SIZE + tcp_opt_size + data_size;
packet = malloc(PSEUDOHDR_SIZE + packet_size);
@@ -41,7 +43,7 @@
}
pseudoheader = (struct pseudohdr*) packet;
tcp = (struct mytcphdr*) (packet+PSEUDOHDR_SIZE);
- tstamp = (unsigned char*) (packet+PSEUDOHDR_SIZE+TCPHDR_SIZE);
+ opts = (unsigned char*) (packet+PSEUDOHDR_SIZE+TCPHDR_SIZE);
data = (char*) (packet+PSEUDOHDR_SIZE+TCPHDR_SIZE+tcp_opt_size);
memset(packet, 0, PSEUDOHDR_SIZE+packet_size);
@@ -64,14 +66,24 @@
tcp->th_win = htons(src_winsize);
tcp->th_flags = tcp_th_flags;
+ /* tcp MSS option */
+ if (opt_tcp_mss) {
+ opts[0] = 2;
+ opts[1] = 4; /* 4 bytes, kind+len+MSS */
+ opts[2] = tcp_mss >> 8;
+ opts[3] = tcp_mss & 0xff;
+ opts += 4;
+ }
+
/* tcp timestamp option */
if (opt_tcp_timestamp) {
__u32 randts = rand() ^ (rand() << 16);
- tstamp[0] = tstamp[1] = 1; /* NOOP */
- tstamp[2] = 8;
- tstamp[3] = 10; /* 10 bytes, kind+len+T1+T2 */
- memcpy(tstamp+4, &randts, 4); /* random */
- memset(tstamp+8, 0, 4); /* zero */
+ opts[0] = opts[1] = 1; /* NOOP */
+ opts[2] = 8;
+ opts[3] = 10; /* 10 bytes, kind+len+T1+T2 */
+ memcpy(opts+4, &randts, 4); /* random */
+ memset(opts+8, 0, 4); /* zero */
+ opts += 12;
}
/* data */
--- a/docs/hping3.8
+++ b/docs/hping3.8
@@ -98,6 +98,8 @@
] [
.B \-\-tcpexitcode
] [
+.B \-\-tcp-mss
+] [
.B \-\-tcp-timestamp
] [
.B \-\-tr-stop
@@ -510,6 +512,9 @@
.I -b --badcksum
Send packets with a bad UDP/TCP checksum.
.TP
+.I --tcp-mss
+Enable the TCP MSS option and set it to the given value.
+.TP
.I --tcp-timestamp
Enable the TCP timestamp option, and try to guess the timestamp update
frequency and the remote system uptime.
--- a/docs/french/hping2-fr.8
+++ b/docs/french/hping2-fr.8
@@ -99,6 +99,8 @@
] [
.B \-\-tcpexitcode
] [
+.B \-\-tcp-mss
+] [
.B \-\-tcp-timestamp
] [
.B \-\-tr-stop
@@ -549,6 +551,9 @@
.I -b --badcksum
Envoie des paquets avec une mauvaise somme de contrôle UDP/TCP
.TP
+.I --tcp-mss
+Active l'option TCP MSS et la fixe avec la valeur donnée.
+.TP
.I --tcp-timestamp
Active l'option TCP timestamp, et essaye de deviner la fréquence de mise à
jour du timestamp et l'uptime du système distant.
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