Date: Thu, 17 Jan 2002 22:58:22 -0500 From: Florent Parent <Florent.Parent@viagenie.qc.ca> To: Archie Cobbs <archie@dellroad.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: netgraph: how to setsockopt on ksocket node ? Message-ID: <214190000.1011326302@blues.viagenie.qc.ca> In-Reply-To: <200201180216.g0I2G8k23055@arch20m.dellroad.org> References: <200201180216.g0I2G8k23055@arch20m.dellroad.org>
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[-- Attachment #1 --]
--On 2002-01-17 18:16:08 -0800 archie@dellroad.org wrote:
> Florent Parent writes:
>> Anyone has an example on how to setsockopt on a ksocket node in netgraph?
>>
>> struct opts {
>> int level;
>> int name;
>> int value;
>> } myopts = { SOL_SOCKET, SO_REUSEADDR, 1
>> };
>>
>> ret = NgSendMsg(cs, epath, NGM_KSOCKET_COOKIE, NGM_KSOCKET_SETOPT,
>> (struct ng_ksocket_sockopt *)&myopts,
>> sizeof(myopts)));
>>
>> return error 14 "Bad address".
>>
>> Did some tracing in ng_ksocket.c and the struct sockopt sent as argument
>> to sosetopt() seems to contains sane values:
>>
>> sopt.sopt_val = 0xc182452c (pointer dereferences to 1)
>> sopt.sopt_valsize = 4
>
> What kind of socket?
UDP
>
> What version of FreeBSD?
4.5-PRERELEASE (~ 2 weeks old)
> That should work.. if the error is coming from the sosetopt()
> call then it's a socket problem rather than a netgraph problem.
>
> What if you create the socket normally and call setsockopt()?
Well that works just fine. I've attached normal.c which is a dummy example
using standard socket calls, and I've attached netgraph.c which wants to do
the same thing using a ksocket node. The latter fails with the following
debug:
netgraph: SENDING MESSAGE:
netgraph: SOCKADDR: { fam=32 len=9 addr=".dummy" }
netgraph: NG_MESG :
netgraph: vers 2
netgraph: arglen 12
netgraph: flags 0
netgraph: token 3
netgraph: cookie KSOCKET (942710669)
netgraph: cmd 7
netgraph: args (12 bytes)
netgraph: 0000: ff ff 00 00 00 02 00 00 01 00 00 00
............
netgraph: sendto(.dummy): Bad address
.dummy Cannot setopt the ksocket node: Bad address
It has to be the way I'm presenting the socket options arguments through
the netgraph interface. This is why I originally asked for any example on
doing a setsockopt through netgraph.
Thanks for the help
Florent.
[-- Attachment #2 --]
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include <netgraph.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_ksocket.h>
#define DEBUG
#define SERVADDR "192.168.31.2"
#define SERV_PORT 2002
int main(int argc, char **argv)
{
int cs, ds;
int ret;
struct ngm_mkpeer ksock;
struct sockaddr_in sin;
char epath[128];
struct opts {
int level;
int name;
int value;
} myopts;
myopts.level = SOL_SOCKET;
myopts.name = SO_REUSEPORT;
myopts.value = 1;
/* Create a socket node */
if (NgMkSockNode(NULL, &cs, &ds) == -1) {
perror("Cannot create netgraph socket node");
return -1;
}
sprintf(epath, ".");
snprintf(ksock.type, sizeof (ksock.type), "%s", NG_KSOCKET_NODE_TYPE);
snprintf(ksock.ourhook, sizeof (ksock.ourhook), "%s", "dummy");
snprintf(ksock.peerhook, sizeof (ksock.peerhook), "%s", "inet/dgram/udp");
if ( (ret = NgSendMsg(cs, epath, NGM_GENERIC_COOKIE, NGM_MKPEER, &ksock, sizeof ksock)) < 0) {
fprintf(stderr, "%s Cannot create an ksocket node: %s\n",
epath, strerror(errno));
exit(-1);
}
#ifdef DEBUG
NgSetDebug(2);
#endif
sprintf(epath, ".%s", ksock.ourhook);
if ( (ret = NgSendMsg(cs, epath, NGM_KSOCKET_COOKIE, NGM_KSOCKET_SETOPT,
(struct ng_ksocket_sockopt *)&myopts, sizeof(myopts))) < 0) {
fprintf(stderr, "%s Cannot setopt the ksocket node: %s\n",
epath, strerror(errno));
// exit (-1);
}
/* Bind the ksocket to our IPv4 address and our UDP source port */
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_port = htons(SERV_PORT);
inet_pton(AF_INET, SERVADDR, &sin.sin_addr);
if ( (ret = NgSendMsg(cs, epath, NGM_KSOCKET_COOKIE, NGM_KSOCKET_BIND,
(struct sockaddr *)&sin, sizeof(sin))) < 0) {
fprintf(stderr, "%s Cannot bind the ksocket node: %s\n",
epath, strerror(errno));
exit (-1);
}
getchar();
exit (0);
}
[-- Attachment #3 --]
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#define SERVADDR "192.168.31.2"
#define SERV_PORT 2002
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
const int on = 1;
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
inet_pton(AF_INET, SERVADDR, &servaddr.sin_addr);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd == -1) {
perror("socket");
exit(1);
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) == -1) {
perror("sockopt");
exit(1);
}
if (bind(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) == -1) {
perror("bind");
exit(1);
}
getchar();
exit(0);
}
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