Cal Poly Central UNIX man pages : udp (7)::
is normally used with the sendto(), sendmsg(), recvfrom(), and recvmsg() calls EACCES A bind() operation was attempted with a reserved port number and the
http://www.calpoly.edu/cgi-bin/man-cgi?udp+7HOME |
Hi,
in some program i wrote, im getting a EACCES (permission denied) whenever i run it.
[EACCES]
Search permission is denied for a component of the path prefix; or write access to the named socket is denied.
Now, i know what could cause this error, but i cant find a problem in my code....
I mean, any function in some program should be able to write to a socket arent they?
So, what is the solution for this error?
im not posting the code since its pretty big... but if you really need the code, just ask it ;)
thanks,
encrypted
D'oh! I see now you mentioned that right in the main thread
subject... ;-) I wasn't paying attention, I guess... ;-)
Hmmmm... The only thing I can think of is that maybe you're
trying to send messages to a broadcast address without having
SO_BROADCAST set...
sendto() is failing with EACCES
encrypted
What function exactly is failing with EACCES??
saddr.s_addr = inet_addr(argv[1]);
daddr.s_addr = inet_addr(argv[2]);
Um, based on the above command-line, argv[1] and [2] are
The GNU C Library - Sockets::
A Linux Help site providing categorized and searchable Linux Help files, Linux Howtos, EACCES. You do not have permission to access the requested address.
http://www.linuxselfhelp.com/gnu/glibc/html_chapter/libc_16.htmlHOME |
OpenSS7: Documentation: Man Pages: Manpage of LISTEN::
Manual Page and the socket file descriptor does have O_NONBLOCK set, sendto() will fail. [EACCES]
http://www.openss7.org/man2html?sendto(3)HOME |
"-P" and "T", respectively... So, both inet_addr() calls will be
failing; and, the documented failure return is -1, which is equivalent
to the limited broadcast address 255.255.255.255... So, yes, you
ARE attempting to send to a broadcast address without
SO_BROADCAST sent... ;-)
What you really want there is:
saddr.s_addr = inet_addr(argv[optind]);
daddr.s_addr = inet_addr(argv[optind+1]);
Of course, you'd want to perform checks first to make sure that
optind was sufficiently less than argc, too... (And, of course, the
same thing applies for reading the port numbers, too...)
And, in your getopt() loop, it looks like you've got the nested
switch()'s commented out, so "protocol" and "tcp_bit" are never
getting set... Also, those nested switches are missing "break"s
after ever case... And, you want to switch() on "*optarg", I think...
Well, im pretty sure im not sending to a broadcast address
here is the source after all ;)
http://home.planet.nl/~west3142/n.c
bash-2.05b# ./n -P T -c S 192.168.168.252 62.131.125.3 9182 80
Done protocol
T
Done TCP BITZ
2.5.42: accessfs 1/3: new networking hooks [LWN.net]::
Debians election season: old firmware and new contributors return -EACCES; + + return 0; +#else + return -EACCES; +#endif +} + +static
http://lwn.net/Articles/12588HOME |
SGI TPL View (3 mq_open)::
SGI Technical Publications Library following conditions are true: [EACCES] The message queue does not exist and [ EACCES] The message queue exists, but
http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?cmd=getdoc50&db=man&fname=3+mq_openHOME |
S
Ok, done getopts
Done atoi-ing port numberz
Done Sin family
Done sin port
Done sin addr
Done memsetting sin zero
Done getuid
Done setting packety_size
Packet size iz: 40 en 40
Done setting setsockopt in TCP
Just charred packet
Malloced packet
INitialised headers
Done zerooing packet
Done fillin in pseudo hdr
sendto_in_tcp: Permission denied
bash-2.05b#
192.168.168.252 is the intern ip address of my computer.
62.131.125.3 is the router that connects me to the internet.
All the text that it prints is for me to see if it goes well ;)
Thanks,
encrypted
Um, based on the above command-line, argv[1] and [2] are
"-P" and "T", respectively... So, both inet_addr() calls will be
failing; and, the documented failure return is -1, which is equivalent
to the limited broadcast address 255.255.255.255... So, yes, you
ARE attempting to send to a broadcast address without
SO_BROADCAST sent... ;-)
hehe lol 8)
thanks for that
it works now, so im quite happy :D
allthough theres still something that doesnt work the way i want it.....
its about this part:
case 'c': switch(optarg)
{
case 'S': tcp_bit = TH_SYN; break;
case 'A': tcp_bit = TH_ACK; break;
case 'R': tcp_bit = TH_RST; break;
case 'P': tcp_bit = TH_PUSH; break;
case 'F': tcp_bit = TH_FIN; break;
case 'U': tcp_bit = TH_URG; break;
default: usage(NAME);
}
check = 1; break;
case 'P': switch(optarg)
{
case 'T': protocol = 1; if( check != 1 ) usage(NAME); break;
case 'U': protocol = 2; break;
case 'I': protocol = 3; break;
default: usage(NAME); break;
}
break;
When i compile it, it says:
Switch quantity not an integer
i know optarg is a char variable but i thought you could switch any kind of variable....
do you know how i can make it compile?
Because now im using instead of S,A,R,P,F and U, 1 2 3 4 5 and 6 to refer to the control bits, but the letters is more understandable..
thanks,
encrypted
No, "optarg" is not a char; it's a "char*", ie: a string... You want
to switch on "*optarg" or "optarg[0]"... (Which I also mentioned
in the last sentence of my last post... ;-))
ahhh i see,
now it becomes clear to me ;)
anyway thanks (again)
encrypted
 How much does getting a small tattoo on your hip/stomach hurt?
 Do anyone else have an itchy anus? ?
|
sendto() and EACCES