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Hi,
Meanwhile i was trying to send icmp packets; got to know that byte ordering of address is wrong. I tried the above program by changing the address byte order, but with no luck. Could any one please let me know how routing header can be sent as a ancilliary data in v6 and what might be wrong with this code.
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <errno.h>
#include <string.h>
void main()
{
int sock_fd;
int on = 1;
int offset = 4;
int ret = 0;
struct sockaddr_in6 *daddr;
struct in6_pktinfo pinfo;
struct msghdr msg;
struct cmsghdr *cmsg;
struct iovec *iovector;
socklen_t rthlen = 0;
int cmsglen;
sock_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_IPV6);
if(sock_fd < 0)
{
printf("\nClient: Socket Creation Failed: Error %d\n", errno);
return;
}
iovector = (struct iovec*)calloc(1, sizeof(struct iovec));
/* Since for Mobility Header the checksum is located in offset 4, we need to
* set the offset to 4
*/
if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_RECVRTHDR, &on, sizeof(on)) < 0)
{
printf("\nClient: RTHDR option set failed\n");
return;
}
/* Our Destination Address is fe80::21d:9ff:fe17:5d0e eth0 interface
* i.e. fe80 :021d:09ff:fe17:5d0e
*/
daddr = (struct sockaddr_in6*)calloc(1, sizeof(struct sockaddr_in6));
daddr->sin6_family = AF_INET6;
daddr->sin6_addr.s6_addr16[0] = 0x80fe;
daddr->sin6_addr.s6_addr16[1] = 0x0;
daddr->sin6_addr.s6_addr16[2] = 0x0;
daddr->sin6_addr.s6_addr16[3] = 0x0;
daddr->sin6_addr.s6_addr16[4] = 0x1d02;
daddr->sin6_addr.s6_addr16[5] = 0xff09;
daddr->sin6_addr.s6_addr16[6] = 0x17fe;
daddr->sin6_addr.s6_addr16[7] = 0x0e5d;
daddr->sin6_port = htons(IPPROTO_IPV6);
/* Our Source Address is fe80::21d:9ff:fe17:58c7 eth0 interface
* i.e. fe80 :021d:09ff:fe17:58c7
*/
memset(&pinfo, 0, sizeof(struct in6_pktinfo));
pinfo.ipi6_addr.s6_addr16[0] = 0x80fe;
pinfo.ipi6_addr.s6_addr16[1] = 0x0;
pinfo.ipi6_addr.s6_addr16[2] = 0x0;
pinfo.ipi6_addr.s6_addr16[3] = 0x0;
pinfo.ipi6_addr.s6_addr16[4] = 0x1d02;
pinfo.ipi6_addr.s6_addr16[5] = 0xff09;
pinfo.ipi6_addr.s6_addr16[6] = 0x17fe;
pinfo.ipi6_addr.s6_addr16[7] = 0xc758;
pinfo.ipi6_ifindex = 2; /* Interface Id */
/* Fill the Routing Header in ancillary data */
rthlen = inet6_rth_space(IPV6_RTHDR_TYPE_0, 1);
cmsglen = CMSG_SPACE(rthlen);
printf("\nClient: rthlen is %d\n", rthlen);
cmsg = malloc(cmsglen);
if (cmsg == NULL)
{
printf("\nClient:Ancillary Data memory allocation failed\n");
return;
}
memset(cmsg, 0, cmsglen);
memset(&msg, 0, sizeof(msg));
iovector->iov_base = malloc(10);
iovector->iov_len = 10;
strcpy(iovector->iov_base, "TEST-4-RH");
msg.msg_control = (void *)cmsg;
msg.msg_controllen = cmsglen;
msg.msg_iov = iovector;
msg.msg_iovlen = 1;
msg.msg_name = (void *)daddr;
msg.msg_namelen = sizeof(struct sockaddr_in6);
void *rthp;
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(rthlen);
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_RTHDR;
rthp = CMSG_DATA(cmsg);
rthp = inet6_rth_init(rthp, rthlen, IPV6_RTHDR_TYPE_0, 1);
if(rthp == NULL)
{
printf("\nClient: Routing Header Init failed\n");
return;
}
inet6_rth_add(rthp, &daddr->sin6_addr);
rthp = NULL;
ret = sendmsg(sock_fd, &msg, 0);
if (ret < 0)
{
printf("\nClient:Send Message Failed: Error %d Ret %d\n", errno, ret);
free(iovector->iov_base);
free(iovector);
return;
}
}
Regards,
Shekharban
banshekhar
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Hi all,
I m working with C under linux and i have a little prob :
while(1)
{
if(scanf("%s", msg)>0)
printf("Yr message is %s\n", msg);
else
}
but when i run the prog it still frozen waiting for the message but i wanna it do the other Job bloc. So is there any function that helps me detecting if there is a key pressed or no ???
Thx.
"The Ultimate Limit Is Only Your Imagination."
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How can i download DSL(Damn Small Linux) from the web 'coz i am new to
Linux ?,Plz help
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Go to http://damnsmalllinux.org/download.html[^], select any of the mirrors, then go to the current folder and download current.iso. Burn the image onto a CD, then reboot your system and the DSL live CD should load.
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I have written this code
The call to CreateSharedMem creates and returns the id of shared memory segment but when i call GetSharedMem it returns 0?
Any idea what i am doing wrong ?
Thank You
int CreateSharedMem(char* key_file, char id, int seg_size)
{
int shm_id;
key_t keyval;
if ((keyval = ftok(key_file,id))==-1)
{
perror("ftok");
return -1;
}
// Can use IPC_EXCL which will fail and returns -1 if a segment with the same key exists
if((shm_id = shmget( keyval, seg_size, IPC_CREAT | 0666 | IPC_EXCL )) == -1)
{
perror("shmget");
return(-1);
}
return(shm_id);
}
int GetSharedMem(char* key_file,char id, int seg_size)
{
int shm_id;
key_t key_val;
if ((key_val = ftok(key_file,id))==-1)
{
perror("ftok");
return -1;
}
printf("Key is %d",key_val);
// Can use IPC_EXCL which will fail and returns -1 if a segment with the same key exists
if((shm_id = shmget( key_val , seg_size, IPC_CREAT | 0666 ) == -1))
{
perror("shmget");
return(-1);
}
return(shm_id);
}
main()
{
.
.
/* Create a shared memory */
int my_shm_id = CreateSharedMem("MySharedMem.c",'A',1000);
printf("%d : Shared mem is created\n",my_shm_id);
/* Get the same shared memory */
int my_shm_id = GetSharedMem("MySharedMem.c",'A',1000);
printf("%d is Shared mem that is created\n",my_shm_id);
.
.
}
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Why are you using IPC_CREAT again in GetSharedMem function when you are only trying to get a shared memory?
shouldn't it be something like....
<br />
if((shm_id = shmget( key_val , seg_size, 0666 ) == -1))<br />
-------------------------------------------
It's code that drives you - Shyam
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Let me ask you a straight question to all the Linux.com users. Is linux good enuff?
First i hear that it is free software. We kno that enything free sucks. My office has free coffee which sucks. So Linux does suck. The software / installation / maintainance all sucks.
But windows xp / vista is very stable and secure. They have frequent releases of service packs and vital security updates. All because u pay for it. So i advice all Linux users to stop believing in free and buy Windows / MAC OS X. Let me know ur views on it
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I think it's not about free or not ,it's about the open source ,a open soft spirit!
however , it does depend on your own choice .no one can deny your choice except yourself... 
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I've taken a course in the past that covered unix/linux and I have one coming up my final semester. The course I took covered the command line using mainly the bash shell and a few programs like vim and emacs. Anyways I wanted to practice a little at home since alot of programming jobs want unix or linux experience.
I was wondering what is the unix/linux defacto programming environment or do people actually use vim and emacs for that? Also do people still use the command line alot and if so why? I really don't see the advantage of using the command line as compared to using a GUI. Also what distro would you recommend I try?
thanks for you help.
Mike
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Mike command line and GUI are two different worlds. Most jobs that require UNIX / LINUX experience involve you writing shell scripts, scripts that automate processes etc. They don't really require you to develop a GUI.
The defacto programming enviornment for GUI based apps differ because of variety of choices Linux offers  . KDevelop, Eclipse, Glade Designer, MonoDevelop are some of the great GUI development tools available. Some distributions have this in-built into them.
MikeMarq wrote: Also what distro would you recommend I try?
Each distro has its own plus and minus. However OpenSUSE 11 was my fav because i came inbuilt with so many dev tools that i rarely needed to connect to internet to download them.
I found the articles written by pseudonym67 at codeproject are a great place to start if you are looking for learning gui development in Linux, though i never spent time in reading them  . Hope I do that this diwali.
http://lamp.codeproject.com/script/Articles/MemberArticles.aspx?amid=441940[^]
I have written a simple article on MonoDevelop to consume web services.
http://lamp.codeproject.com/KB/webservices/MonoStockInformation.aspx[^]
As you can see, development in Linux seriously lacked proper articles and was the birth-right of a few people. I personally remember during my college days browsing through page 10 of google search results to learn APIs in Linux. But I feel with the LAMP section of CodeProject this would change and there would be wonderful articles that can teach development in Linux
-------------------------------------------
It's code that drives you - Shyam
modified on Monday, October 27, 2008 2:35 AM
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Thank you for your excellent reply.
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Hi All,
I m fighting against a problem that drove me crazy for long hours, I wanna create a simple prog like Client/Server under linux using C code. I wrote a Server.c and Client.c Files but when i type
$gcc -c Server.c Client.c
$gcc -o Blood *.o
it told me that there is a double declarion of the function main
So could some one tell me how could i test my prog on the same mchine ??? (local) Thank you !!!!
i Need Help so plz !!!
"The Ultimate Limit Is Only Your Imagination."
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Blood_HaZaRd wrote: $gcc -c Server.c Client.c
$gcc -o Blood *.o
it told me that there is a double declarion of the function main
Did you try this?
$gcc -c Server.c Client.c
$gcc -o blood_server Server.o
$gcc -o blood_client Client.o
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Ok i asked my professor and here what he told me to do:
after compiling the 2 files:
$gcc - client client.c
$gcc - server server.c
i ha to add a & when calling ther server:
$./server &
then i run the clien
$./client
that's all. i didn't try it yet but i hope that it'll works.
Thank you All for your Help. I appreciate it Well.
![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
"The Ultimate Limit Is Only Your Imagination."
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you will need to compile each file separately. each file creates a different exe, one will create a client exe and the other a server exe.
each file has a main method, when you compile files together it to create a single exe, so what you are doing is incorrect. in short you can't have multiple definitions of a function, in your case that would be 'main'
try:
gcc -o server server.c
gcc -o client client.c
hope this helps
---
Yours Truly, The One and Only!
web: devmentor.org
Design, Code, Test, Deploy
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Dear friends,
I'll appreciate if anyone could help me this problem.
I'm now trying to program with multi-core. For instant, with C/C++, how can I assign a task for the first core and another task for the second core? Is there any instructions support this? Or could you show me where can I find any documents relate to this field.
Thank you very much.
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I think pthreads handle this automatically, but I don't know how much manual control you can get. Maybe this Linux magazine article (google cache) helps.
/M
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Thanks. I'm checking.
Can otherone help me this? I'd like to receive more information.
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You can use the sched_setaffinity() system call to lock a thread to a specific set of CPUs/cores. In most cases doing that is a bad idea and it will only slow down your system.
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Thank you very much. This instruction was created so it must have some useful functions beside causing system slow down. But first of all, I need to try it. Once again, thanks.
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hi i would like to know how to sort my dynamic generated table in php when i click on any header row on first click sort acending and on another click sort on decending order.
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If you wanna sort Mysql Data, you should use two difference Mysql Query.
For example :
SELECT * FROM table1 ORDER BY filed ASC
SELECT * FROM table1 ORDER BY filed DESC
Else if you wanna sort a table in client you should use JavaScript.
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ya i know these are two commands to show asc and desc but i would like to know that i have a grid table in php and on every field i want to do this and show a image full process to do this this grid is filled by while loop as used in php all dataare there but i want to show sorting on header of the fields click.
thanks for reply
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I think you want to load a table and then be able to sort the data by a column after the data is loaded by clicking on the col header, correct? Uh oh, i think i may like jQuery too much as i just posted a different response pointing the user to the jQuery library.
Take a look at ajaxrain.com for table plugins to jQuery. I know there's a couple of them out there, if this is what you're looking for
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