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rude
rude
Commits
b4670094
Commit
b4670094
authored
Jan 15, 2015
by
yorn
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Rewrite receive code to support TTL
parent
61a479e5
Changes
1
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1 changed file
with
40 additions
and
9 deletions
+40
-9
crude/main.c
crude/main.c
+40
-9
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crude/main.c
View file @
b4670094
...
...
@@ -937,31 +937,62 @@ static void get_str_addr(struct sockaddr_storage src_addr,char buffer[]){
*/
static
int
rec_n_print
(
unsigned
short
port
,
unsigned
long
limit
)
{
long
rec_bytes
=
0
;
/* Bytes read */
ssize_t
rec_bytes
=
0
;
/* Bytes read */
int
src_len
=
sizeof
(
struct
sockaddr_storage
);
int
ttl
=
64
;
int
received_ttl
;
struct
sockaddr_storage
src_addr
;
struct
msghdr
msgh
;
struct
iovec
iov
;
struct
timeval
time1
;
struct
udp_data
*
udp_ptr
;
struct
sockaddr_storage
d_add
;
struct
cmsghdr
*
cmptr
=
NULL
;
#define CONTROLLEN (sizeof(struct cmsghdr) + sizeof(int))
char
buffer
[
PMAXSIZE
],
str1
[
INET6_ADDRSTRLEN
],
str2
[
INET6_ADDRSTRLEN
];
/* Initialize some variables */
memset
(
buffer
,
0
,
PMAXSIZE
);
memset
(
str1
,
0
,
INET6_ADDRSTRLEN
);
memset
(
str2
,
0
,
INET6_ADDRSTRLEN
);
char
srcport
[
10
];
while
(
1
)
cmptr
=
malloc
(
CONTROLLEN
);
iov
.
iov_base
=
&
buffer
;
iov
.
iov_len
=
sizeof
(
buffer
);
memset
(
&
msgh
,
0
,
sizeof
(
msgh
));
msgh
.
msg_name
=
&
src_addr
;
msgh
.
msg_namelen
=
sizeof
(
src_addr
);
msgh
.
msg_iov
=
&
iov
;
msgh
.
msg_iovlen
=
1
;
msgh
.
msg_control
=
(
caddr_t
)
cmptr
;
msgh
.
msg_controllen
=
CONTROLLEN
;
if
(
setsockopt
(
main_socket
,
IPPROTO_IP
,
IP_RECVTTL
,
&
ttl
,
sizeof
(
ttl
))
>
0
)
{
rec_bytes
=
recvfrom
(
main_socket
,
buffer
,
PMAXSIZE
,
0
,
(
struct
sockaddr
*
)
&
src_addr
,
(
socklen_t
*
)
&
src_len
);
RUDEBUG1
(
"crude: unable to receive TTL values: %s
\n
"
,
strerror
(
errno
));
}
for
(
;
;
)
{
rec_bytes
=
recvmsg
(
main_socket
,
&
msgh
,
MSG_WAITALL
);
if
(
rec_bytes
<=
0
)
{
RUDEBUG1
(
"crude: error when receiving packet: %s
\n
"
,
strerror
(
errno
));
}
else
{
gettimeofday
(
&
time1
,
NULL
);
struct
cmsghdr
*
cmsg
;
int
*
ttlptr
;
received_ttl
=
-
1
;
for
(
cmsg
=
CMSG_FIRSTHDR
(
&
msgh
);
cmsg
!=
NULL
;
cmsg
=
CMSG_NXTHDR
(
&
msgh
,
cmsg
))
{
if
((
cmsg
->
cmsg_level
==
IPPROTO_IP
)
&&
(
cmsg
->
cmsg_type
==
IP_TTL
)
&&
(
cmsg
->
cmsg_len
)
){
ttlptr
=
(
int
*
)
CMSG_DATA
(
cmsg
);
received_ttl
=
*
ttlptr
;
break
;
}
}
gettimeofday
(
&
time1
,
NULL
);
pkt_count
++
;
udp_ptr
=
(
struct
udp_data
*
)
buffer
;
d_add
=
udp_ptr
->
dest_addr
;
...
...
@@ -970,13 +1001,13 @@ static int rec_n_print(unsigned short port, unsigned long limit)
get_str_addr
(
d_add
,
str2
);
printf
(
"ID=%lu SEQ=%lu SRC=%s:%hu DST=%s:%hu "
"Tx=%lu.%06lu Rx=%ld.%06ld SIZE=%ld
\n
"
,
"Tx=%lu.%06lu Rx=%ld.%06ld
TTL=%d
SIZE=%ld
\n
"
,
(
unsigned
long
)
ntohl
(
udp_ptr
->
flow_id
),
(
unsigned
long
)
ntohl
(
udp_ptr
->
sequence_number
),
str1
,
ntohs
(((
struct
sockaddr_in
*
)
&
src_addr
)
->
sin_port
),
str2
,
port
,
(
unsigned
long
)
ntohl
(
udp_ptr
->
tx_time_seconds
),
(
unsigned
long
)
ntohl
(
udp_ptr
->
tx_time_useconds
),
time1
.
tv_sec
,
time1
.
tv_usec
,
rec_bytes
);
time1
.
tv_sec
,
time1
.
tv_usec
,
rec
eived_ttl
,
rec
_bytes
);
fflush
(
stdout
);
}
...
...
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