Socat hangs when piping stdin to tcp server - tcp
I have an embedded linux system running a tcp server.
Telnet can connect to and use the tcp server interactively just fine.
I am trying to use socat to make the same connection, by linking stdin to the tcp server, like so:
socat - tcp:localhost:8088
I get the initial response from the server, and I can type, but as soon as I press enter, the terminal hangs (I can get out of this with Ctrl + C as long as I am not using the raw socat option.)
If I do the same thing but with readline, everything mostly works as expected:
socat readline tcp:localhost:8088
However, with readline, the terminal echoes my input, and then the response from the server also echoes it. This is more than just an annoyance, since things like passwords (which should not even be echoed once) are now visible.
Ideally, I would just use stdin instead of readline, so that I could send each character as soon as I type it, and turn off stdin echo. That way, when I type a character, the tcp server receives it and echoes it immediately, but only if it is supposed to.
But socat is hanging with the stdin option for reasons I don't understand.
I'm looking for an explanation as to why stdin is locking up the thread, or a workaround possibly using readline or similar.
EDIT: Here is the dddd debug output from the socat command when I use stdin:
sh-5.0# socat -d -d -d -d -lu - tcp:localhost:8088
2022/02/04 01:34:58.805536 socat[1074] D getpid()
2022/02/04 01:34:58.807631 socat[1074] D getpid() -> 1074
2022/02/04 01:34:58.807667 socat[1074] D setenv("SOCAT_PID", "1074",
1)
2022/02/04 01:34:58.807687 socat[1074] D setenv() -> 0
2022/02/04 01:34:58.807704 socat[1074] D setenv("SOCAT_PPID", "1074",
1)
2022/02/04 01:34:58.807724 socat[1074] D setenv() -> 0
2022/02/04 01:34:58.807737 socat[1074] I socat by Gerhard Rieger and
contributors - see www.dest-unreach.org
2022/02/04 01:34:58.807752 socat[1074] I This product includes
software developed by the OpenSSL Project for use in the OpenSSL
Toolkit. (http://www.openssl.org/)
2022/02/04 01:34:58.807767 socat[1074] I This product includes
software written by Tim Hudson (tjh#cryptsoft.com)
2022/02/04 01:34:58.807781 socat[1074] D socat version 1.7.3.3 on May
25 2021 13:47:29
2022/02/04 01:34:58.807795 socat[1074] D setenv("SOCAT_VERSION",
"1.7.3.3", 1)
2022/02/04 01:34:58.807811 socat[1074] D setenv() -> 0
2022/02/04 01:34:58.807827 socat[1074] D running on Linux version #1
SMP Mon Jan 31 20:48:32 UTC 2022, release 5.4.0, machine aarch64
2022/02/04 01:34:58.807845 socat[1074] D argv[0]: "socat"
2022/02/04 01:34:58.807857 socat[1074] D argv[1]: "-d"
2022/02/04 01:34:58.807870 socat[1074] D argv[2]: "-d"
2022/02/04 01:34:58.807883 socat[1074] D argv[3]: "-d"
2022/02/04 01:34:58.807895 socat[1074] D argv[4]: "-d"
2022/02/04 01:34:58.807907 socat[1074] D argv[5]: "-lu"
2022/02/04 01:34:58.807920 socat[1074] D argv[6]: "-"
2022/02/04 01:34:58.807932 socat[1074] D argv[7]: "tcp:localhost:8088"
2022/02/04 01:34:58.807945 socat[1074] D sigaction(1, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.807960 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.807973 socat[1074] D sigaction(2, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.807987 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808000 socat[1074] D sigaction(3, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808014 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808026 socat[1074] D sigaction(4, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808040 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808053 socat[1074] D sigaction(6, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808067 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808079 socat[1074] D sigaction(7, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808092 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808105 socat[1074] D sigaction(8, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808119 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808132 socat[1074] D sigaction(11, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808146 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808158 socat[1074] D sigaction(15, 0xffffc8d63a18,
0x0)
2022/02/04 01:34:58.808172 socat[1074] D sigaction() -> 0
2022/02/04 01:34:58.808185 socat[1074] D signal(13, 0x1)
2022/02/04 01:34:58.808200 socat[1074] D signal() -> 0x0
2022/02/04 01:34:58.808213 socat[1074] D atexit(0xaaaaba73c4a0)
2022/02/04 01:34:58.808226 socat[1074] D atexit() -> 0
2022/02/04 01:34:58.808267 socat[1074] D calloc(1, 848)
2022/02/04 01:34:58.808284 socat[1074] D calloc() -> 0xaaaadd2cc680
2022/02/04 01:34:58.808304 socat[1074] D malloc(1024)
2022/02/04 01:34:58.808318 socat[1074] D malloc() -> 0xaaaadd2cca00
2022/02/04 01:34:58.808333 socat[1074] D calloc(1, 848)
2022/02/04 01:34:58.808350 socat[1074] D calloc() -> 0xaaaadd2cce10
2022/02/04 01:34:58.808364 socat[1074] D calloc(1, 848)
2022/02/04 01:34:58.808377 socat[1074] D calloc() -> 0xaaaadd2cd170
2022/02/04 01:34:58.808391 socat[1074] D isatty(0)
2022/02/04 01:34:58.808411 socat[1074] D isatty() -> 1
2022/02/04 01:34:58.808424 socat[1074] D tcgetattr(0, 0xaaaadd2ccf6c)
2022/02/04 01:34:58.808461 socat[1074] D tcgetattr(,
{00005400,00000005,00001cb2,0000083b, 4098,4098,
03,1c,7f,15,04,00,01,00,11,13,1a,00,12,0f,17,16,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00})
-> 0
2022/02/04 01:34:58.808480 socat[1074] D isatty(1)
2022/02/04 01:34:58.808494 socat[1074] D isatty() -> 1
2022/02/04 01:34:58.808507 socat[1074] D tcgetattr(1, 0xaaaadd2cd2cc)
2022/02/04 01:34:58.808542 socat[1074] D tcgetattr(,
{00005400,00000005,00001cb2,0000083b, 4098,4098,
03,1c,7f,15,04,00,01,00,11,13,1a,00,12,0f,17,16,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00})
-> 0
2022/02/04 01:34:59.141868 socat[1074] D malloc(128)
2022/02/04 01:34:59.141888 socat[1074] D malloc() -> 0xaaaadd2cd4d0
2022/02/04 01:34:59.141903 socat[1074] D malloc(128)
2022/02/04 01:34:59.141916 socat[1074] D malloc() -> 0xaaaadd2cd560
2022/02/04 01:34:59.141931 socat[1074] N reading from and writing to
stdio
2022/02/04 01:34:59.141946 socat[1074] D calloc(1, 848)
2022/02/04 01:34:59.141959 socat[1074] D calloc() -> 0xaaaadd2cd5f0
2022/02/04 01:34:59.141983 socat[1074] D malloc(1024)
2022/02/04 01:34:59.141997 socat[1074] D malloc() -> 0xaaaadd2cd9b0
2022/02/04 01:34:59.142015 socat[1074] D getaddrinfo("localhost",
NULL, {1,0,1,6,0,0x0,0x0,0x0}, 0xffffc8d63538)
2022/02/04 01:34:59.142789 socat[1074] D getaddrinfo(,,,{{AF=10
[0000:0000:0000:0000:0000:0000:0000:0001]:0, }) -> 0
2022/02/04 01:34:59.142815 socat[1074] D malloc(128)
2022/02/04 01:34:59.142830 socat[1074] D malloc() -> 0xaaaadd2ce610
2022/02/04 01:34:59.142847 socat[1074] N opening connection to AF=2
127.0.0.1:8088
2022/02/04 01:34:59.142861 socat[1074] I starting connect loop
2022/02/04 01:34:59.142876 socat[1074] D socket(2, 1, 6)
2022/02/04 01:34:59.142900 socat[1074] I socket(2, 1, 6) -> 5
2022/02/04 01:34:59.142919 socat[1074] D fcntl(5, 2, 1)
2022/02/04 01:34:59.142935 socat[1074] D fcntl() -> 0
2022/02/04 01:34:59.142954 socat[1074] D connect(5, {2,AF=2
127.0.0.1:8088}, 16)
2022/02/04 01:34:59.145199 socat[1074] D connect() -> 0
2022/02/04 01:34:59.145246 socat[1074] D getsockname(5,
0xffffc8d635b8, 0xffffc8d6359c{112})
2022/02/04 01:34:59.145269 socat[1074] D getsockname(, {AF=2
127.0.0.1:46294}, {16}) -> 0
2022/02/04 01:34:59.145286 socat[1074] N successfully connected from
local address AF=2 127.0.0.1:46294
2022/02/04 01:34:59.145306 socat[1074] I resolved and opened all sock
addresses
2022/02/04 01:34:59.145321 socat[1074] D malloc(16385)
2022/02/04 01:34:59.145344 socat[1074] D malloc() -> 0xaaaadd2cf400
2022/02/04 01:34:59.145360 socat[1074] N starting data transfer loop
with FDs [0,1] and [5,5]
2022/02/04 01:34:59.145375 socat[1074] D data loop: sock1->eof=0,
sock2->eof=0, closing=0, wasaction=1, total_to={0.000000}
2022/02/04 01:34:59.145395 socat[1074] D select(6, &0x21, &0x22, &0x0,
NULL/0.000000)
2022/02/04 01:34:59.145426 socat[1074] D select -> (, 0x0, 0x20, 0x0,
NULL/0.000000), 1
2022/02/04 01:34:59.145443 socat[1074] D data loop: sock1->eof=0,
sock2->eof=0, closing=0, wasaction=1, total_to={0.000000}
2022/02/04 01:34:59.145461 socat[1074] D select(6, &0x21, &0x2, &0x0,
NULL/0.000000)
2022/02/04 01:34:59.157132 socat[1074] D select -> (, 0x20, 0x0, 0x0,
NULL/0.000000), 1
2022/02/04 01:34:59.157178 socat[1074] D data loop: sock1->eof=0,
sock2->eof=0, closing=0, wasaction=1, total_to={0.000000}
2022/02/04 01:34:59.157198 socat[1074] D select(2, &0x1, &0x2, &0x0,
NULL/0.000000)
2022/02/04 01:34:59.401692 socat[1074] D select -> (, 0x0, 0x2, 0x0,
NULL/0.000000), 1
2022/02/04 01:34:59.401732 socat[1074] D read(5, 0xaaaadd2cf400, 8192)
2022/02/04 01:34:59.401765 socat[1074] D read -> 48
2022/02/04 01:34:59.401782 socat[1074] D write(1, 0xaaaadd2cf400, 48)
ÿûÿû
Connect to IP address 169.254.12.16
2022/02/04 01:34:59.401809 socat[1074] D write -> 48
2022/02/04 01:34:59.401823 socat[1074] I transferred 48 bytes from 5
to 1
2022/02/04 01:34:59.401838 socat[1074] D data loop: sock1->eof=0,
sock2->eof=0, closing=0, wasaction=1, total_to={0.000000}
2022/02/04 01:34:59.401856 socat[1074] D select(6, &0x21, &0x2, &0x0,
NULL/0.000000)
2022/02/04 01:34:59.462969 socat[1074] D select -> (, 0x0, 0x2, 0x0,
NULL/0.000000), 1
2022/02/04 01:34:59.463017 socat[1074] D data loop: sock1->eof=0,
sock2->eof=0, closing=0, wasaction=1, total_to={0.000000}
2022/02/04 01:34:59.463036 socat[1074] D select(6, &0x21, &0x0, &0x0,
NULL/0.000000)
At this point, I can still type, but no matter what I do, I get nothing in response.
Probably it is not Socat that hangs but the server. Use options -v -x to see what data Socat transfers in both situations and compare; maybe there are different line termination characters involved.
Turns out it was a combination of things.
The version of socat I was using (1.7.3.3) has a bug when using certain options. See https://bugs.launchpad.net/ubuntu/+source/socat/+bug/1883957 for more info.
The tty options in my terminal were atypical somehow. By using "stty sane", and then adding -brkint, I got the entire thing working with stdin.
My final solution uses socat version 1.7.4.3, and looks like this:
stty sane
stty -brkint -icanon && socat -,echo=0 tcp:localhost:8088
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digraph search {
// ordering=out;
// color=blue;
// rank=same;
// overlap=scale;
rankdir=LR;
root=root;
ranksep=1.25;
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"root";
a [color=none,fontsize=12];
b [color=none,fontsize=12];
c [color=none,fontsize=12];
d [color=none,fontsize=12];
e [color=none,fontsize=12];
f [color=none,fontsize=12];
#g [color=none,fontsize=12];
h [color=none,fontsize=12];
i [color=none,fontsize=12];
j [color=none,fontsize=12];
k [color=none,fontsize=12];
l [color=none,fontsize=12];
m [color=none,fontsize=12];
n [color=none,fontsize=12];
o [color=none,fontsize=12];
p [color=none,fontsize=12];
q [color=none,fontsize=12];
r [color=none,fontsize=12];
s [color=none,fontsize=12];
t [color=none,fontsize=12];
u [color=none,fontsize=12];
v [color=none,fontsize=12];
w [color=none,fontsize=12];
x [color=none,fontsize=12];
y [color=none,fontsize=12];
#ga [color=none,fontsize=12];
gb [color=none,fontsize=12];
gc [color=none,fontsize=12];
gd [color=none,fontsize=12];
ge [color=none,fontsize=12];
gf [color=none,fontsize=12];
gg [color=none,fontsize=12];
gh [color=none,fontsize=12];
gi [color=none,fontsize=12];
gj [color=none,fontsize=12];
gk [color=none,fontsize=12];
gl [color=none,fontsize=12];
gm [color=none,fontsize=12];
gn [color=none,fontsize=12];
go [color=none,fontsize=12];
gp [color=none,fontsize=12];
gq [color=none,fontsize=12];
gr [color=none,fontsize=12];
gs [color=none,fontsize=12];
gt [color=none,fontsize=12];
gu [color=none,fontsize=12];
gv [color=none,fontsize=12];
gw [color=none,fontsize=12];
gx [color=none,fontsize=12];
gy [color=none,fontsize=12];
gaa [color=none,fontsize=12];
gab [color=none,fontsize=12];
gac [color=none,fontsize=12];
gad [color=none,fontsize=12];
gae [color=none,fontsize=12];
gaf [color=none,fontsize=12];
gag [color=none,fontsize=12];
gah [color=none,fontsize=12];
gai [color=none,fontsize=12];
gaj [color=none,fontsize=12];
gak [color=none,fontsize=12];
gal [color=none,fontsize=12];
gam [color=none,fontsize=12];
gan [color=none,fontsize=12];
gao [color=none,fontsize=12];
gap [color=none,fontsize=12];
gaq [color=none,fontsize=12];
#gaz [color=none,fontsize=12];
gas [color=none,fontsize=12];
gat [color=none,fontsize=12];
gau [color=none,fontsize=12];
gav [color=none,fontsize=12];
gaw [color=none,fontsize=12];
gax [color=none,fontsize=12];
gay [color=none,fontsize=12];
gaza [color=none,fontsize=12];
gazb [color=none,fontsize=12];
gazc [color=none,fontsize=12];
gazd [color=none,fontsize=12];
gaze [color=none,fontsize=12];
#gazf [color=none,fontsize=12];
gazg [color=none,fontsize=12];
gazh [color=none,fontsize=12];
gazi [color=none,fontsize=12];
gazj [color=none,fontsize=12];
gazk [color=none,fontsize=12];
gazl [color=none,fontsize=12];
gazm [color=none,fontsize=12];
gazn [color=none,fontsize=12];
gazo [color=none,fontsize=12];
gazp [color=none,fontsize=12];
gazq [color=none,fontsize=12];
gazr [color=none,fontsize=12];
gazs [color=none,fontsize=12];
gazt [color=none,fontsize=12];
gazu [color=none,fontsize=12];
gazv [color=none,fontsize=12];
gazw [color=none,fontsize=12];
gazx [color=none,fontsize=12];
gazy [color=none,fontsize=12];
root -> a [minlen=2];
root -> b [minlen=2];
root -> c [minlen=2];
root -> d [minlen=2];
root -> e [minlen=2];
root -> f [minlen=2];
root -> g [minlen=2];
root -> h [minlen=2];
root -> i [minlen=2];
root -> j [minlen=2];
root -> k [minlen=2];
root -> l [minlen=2];
root -> m [minlen=2];
root -> n [minlen=2];
root -> o [minlen=2];
root -> p [minlen=2];
root -> q [minlen=2];
root -> r [minlen=2];
root -> s [minlen=20];
root -> t [minlen=2];
root -> u [minlen=2];
root -> v [minlen=2];
root -> w [minlen=2];
root -> x [minlen=2];
root -> y [minlen=2];
root -> 0 [minlen=2];
root -> 1 [minlen=2];
root -> 2 [minlen=2];
root -> 3 [minlen=2];
root -> 4 [minlen=2];
root -> 5 [minlen=2];
root -> 6 [minlen=2];
root -> 7 [minlen=2];
root -> 8 [minlen=2];
root -> 9 [minlen=2];
root -> "." [minlen=2];
g -> ga ;
g -> gb ;
g -> gc ;
g -> gd ;
g -> ge ;
g -> gf ;
g -> gg ;
g -> gh ;
g -> gi ;
g -> gj ;
g -> gk ;
g -> gl ;
g -> gm ;
g -> gn ;
g -> go ;
g -> gp ;
g -> gq ;
g -> gr ;
g -> gs ;
g -> gt ;
g -> gu ;
g -> gv ;
g -> gw ;
g -> gx ;
g -> gy ;
ga -> gaa ;
ga -> gab ;
ga -> gac ;
ga -> gad ;
ga -> gae ;
ga -> gaf ;
ga -> gag ;
ga -> gah ;
ga -> gai ;
ga -> gaj ;
ga -> gak ;
ga -> gal ;
ga -> gam ;
ga -> gan ;
ga -> gao ;
ga -> gap ;
ga -> gaq ;
ga -> gaz ;
ga -> gas ;
ga -> gat ;
ga -> gau ;
ga -> gav ;
ga -> gaw ;
ga -> gax ;
ga -> gay ;
gaz -> gaza ;
gaz -> gazb ;
gaz -> gazc ;
gaz -> gazd ;
gaz -> gaze ;
gaz -> gazf ;
gaz -> gazg ;
gaz -> gazh ;
gaz -> gazi ;
gaz -> gazj ;
gaz -> gazk ;
gaz -> gazl ;
gaz -> gazm ;
gaz -> gazn ;
gaz -> gazo ;
gaz -> gazp ;
gaz -> gazq ;
gaz -> gazr ;
gaz -> gazs ;
gaz -> gazt ;
gaz -> gazu ;
gaz -> gazv ;
gaz -> gazw ;
gaz -> gazx ;
gaz -> gazy ;
gazo -> "Blue Tuesday" ;
"Blue Tuesday" [ fontsize=10];
// Layout engines: circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
}
This output is generated with:
twopi -os1.png -Tpng s1.dot
I'm posting here because the printout is pretty dreadful. All of the nodes hung of "gaz" are overlapping; I've tried specifying nodesep and it is simply ignored. I would like to see the lines from root to the single letters further apart, but again, I can't control that.
This seems to be a bug in twopi. The documentation says it should clearly follow these directives, but it doesn't seem to.
My questions:
Is there any way to make twopi behave?
Failing that, is there a better layout engine to use?
Thanks.
I have found twopi to be the most difficult to work with of all the graphviz layout engines. I made a few small changes to your original dot file. The rendered graph is shown below. Here are the diffs: graph attributes: size="7.75,10.25"; // ensures that entire graph fits on a single 8.5 x 11 page; orientation="landscape"; ranksep=3.0; nodesep=2.0; deleted: "root=root"; and "overlap=true" edge attributes: i set the edge weight equal to 0.1 for all edges: [weight=0.1] Reducing the edge weight by 90% for all edges has the net effect of increasing the edge length (or more precisely relaxing the constraint on edge length); obviously, this helps the nodes to "fan out". Doing this also increases the distance between "g" and "root", giving the child nodes of "root" more room. I also tweaked a few purely aesthetic attributes--not having any effect on the layout, but that to me, seem to matter when you need to draw even a moderately dense graph on a single page: graph attributes: fontname="Helvetica"; fontsize=13 node attributes: "root" [color="goldenrod4", shape="diamond", style="filled"] "g" [color="lightsteelblue2", shape="diamond", style="filled"] "ga" [color="darkorange", shape="diamond", style="filled"] "gaz" [color="bisque4", shape="diamond", style="filled"] edge attributes: [arrowsize=0.4, penwidth=1.2]
How to force position of edges in graphviz?
I'm having problems with edges overlapping each other. In my previous question of how to force the nodes to be in the same column, found out how to force the nodes in to one column, but this causes some other problems to appear.
digraph exmp {
A -> B -> C -> D -> E
C -> F [constraint=false]
A -> C [style="dotted", constraint=false]
A -> D [style="dotted", constraint=false]
B -> D [constraint=false]
D -> A [style="dashed", constraint=false]
C -> A [style="dashed", constraint=false]
E -> F [style="invis"]
F -> G
E -> C [constraint="false"]
}
Renders to:
alt text http://img98.imageshack.us/img98/8324/wrong2.gif
My problem is that the edges from E -> C and C -> F are starting/ending at the same point in the node C and the dashed and dotted edges are all on the right side of the nodes.
How could I tell specific edges to go to the right side of the node?
After a message in the graphviz mail list I've found that's at least possible to remove the E -> C and C -> F overlapping problem. The simplest solution is to use a compass point port: C:e -> F [constraint=false] -- Emden