How to get Mac address via DLPI API

[hgjsj]

I developed my project on HPUX ia64 11.v3, how can I get NIC's count and MAC address of each using DLPI API or other method? Thanks!!!!

[Laurent Menase]

system("lanscan");

or putmsg a DL_ATTACH_REQ
then a
DL_INFO_REQ message after attaching to a ppa.
then get the DL_INFO_ACK.

[Laurent Menase · Accepted solution]

I took 10min to make an example:
#include
#include
#include
#include

main(c,v)
int c;
char **v;
{
int f;
dl_attach_req_t dar;
dl_info_req_t dir;
struct strbuf ctl;
struct strbuf data;
unsigned char buf[4096];
dl_ok_ack_t *doa=(dl_ok_ack_t*)buf;
dl_info_ack_t *dia=(dl_info_ack_t*)buf;
dl_error_ack_t *dea=(dl_info_ack_t*)buf;
int r;
int fl=0;
int prim;

f=open("/dev/dlpi",O_RDWR);
dar.dl_primitive=DL_ATTACH_REQ;
dar.dl_ppa=atoi(v[1]);;
ctl.buf=(char*)&dar;
ctl.maxlen=ctl.len=sizeof(dar);
putmsg(f,&ctl,0,0);

ctl.buf=(char*)&buf;
ctl.maxlen=ctl.len=sizeof(buf);
data.len=0;
data.maxlen=sizeof(buf);
data.buf=&buf;
fl=RS_HIPRI;
r=getmsg(f,&ctl,&data,&fl);
if(r<0) perror("getmsg");
if((prim=doa->dl_primitive)!=DL_OK_ACK)
{
if (dea->dl_primitive==DL_ERROR_ACK)
printf("erreur: ppa=%d dl_error=%d dl_unix_errno=%d\n",atoi(v[1]),dea->dl_errno,dea->dl_unix_errno);
else
printf("erreur: ppa=%d primitive=%x\n",atoi(v[1]),dea->dl_primitive);
exit(1);
}
dir.dl_primitive=DL_INFO_REQ;
ctl.buf=(char*)&dir;
ctl.maxlen=ctl.len=sizeof(dir);
putmsg(f,&ctl,0,0);
ctl.buf=(char*)&buf;
ctl.maxlen=ctl.len=sizeof(buf);
data.len=data.maxlen=0;
data.buf=0;
fl=0;
r=getmsg(f,&ctl,&data,&fl);
if(r<0) perror("getmsg");
dia=buf;
if(dia->dl_primitive==DL_INFO_ACK)
{
int i;
int l;
int o;
char sep='=';
unsigned char*c;
l=dia->dl_addr_length;
o=dia->dl_addr_offset;
printf("interface %d mac addr",atoi(v[1]));
c=buf+o;
for(i=0;i {
printf("%c%02x",sep,c[i]);
sep=':';
}
printf("\n");
}
else
printf("error! primitive=%d\n",dia->dl_primitive);
}




# cc m.c
# ./a.out 1
interface 1 mac addr=00:17:a4:51:4b:d1
# lanscan |grep lan1
0/1/2/1 0x0017A4514BD1 1 UP lan1 snap1 2 ETHER Yes 119

[hgjsj]

Thanks for your reply! according to the code above, it only get MAC address of lan1, could you tell me how many ethernet interface system installed, I need get all the MAC address of them.

[VK2COT]

Hello,

Laurent already provided you with
almost everything.

HP documentation on DLPI programming
discusses various primitives including:

DL_HP_PPA_REQ
This primitive is used to obtain a list of
all the valid PPAs currently installed in
the system.

This message consists of one M_PCPROTO
message block which contains the following
structure.

Format

typedef struct {
u_long dl_primitive;
} dl_hp_ppa_req_t;

...

If your C programming is not efficient,
as a simple workaround you could use
Laurent's program and write a Shell
wrapper for it by using nwmgr(1M) or
lanscan(1m).

An example for lanscan(1m) (I cannot remember the layout for command nwmgr as
I am not at work and do not have HP-UX
11.31 server in front of me:

for PPA in `lanscan -i | awk '{print $1}' | sed -e 's/^lan//g'`
do
./a.out $PPA
done

Cheers,

VK2COT

[hgjsj]

Thanks both of you, I know Laurent code is right, it is also a good workaroud way using shell scrip to wrapper, but i must use C programming to get PPAs list and get all of the MAC address. Could you give me a sample? many thanks.

[hgjsj]

Thanks, I had fixed this issue.

u_long ctrl_area[LONG_AREA_SIZE];
u_long data_area[LONG_AREA_SIZE];
u_long i ;
int fd;
int ppa;
dl_hp_ppa_req_t *ppa_req = (dl_hp_ppa_req_t *)ctrl_area;
dl_hp_ppa_ack_t *ppa_ack = (dl_hp_ppa_ack_t *)ctrl_area;
dl_hp_ppa_info_t *ppa_info;
dl_error_ack_t *err_ack;
int flags = 0;


struct strbuf ctrl_buf;
struct strbuf data_buf;

ctrl_buf.maxlen = AREA_SIZE;
ctrl_buf.len = 0;
ctrl_buf.buf = (char*)ctrl_area;

data_buf.maxlen = AREA_SIZE;
data_buf.len = 0;
data_buf.buf = (char*)data_area;

/* open the device file */
if((fd = open("/dev/dlpi", O_RDWR)) == -1)
{
bRet = AL_false;
goto _exit;
}

ppa_req->dl_primitive = DL_HP_PPA_REQ;

ctrl_buf.len = sizeof(dl_hp_ppa_req_t);

if(putmsg(fd, &ctrl_buf, 0, 0) < 0)
{
bRet = AL_false;
goto _exit;
}

ctrl_area[0] = 0;

if(getmsg(fd, &ctrl_buf, &data_buf, &flags) < 0)
{
bRet = AL_false;
goto _exit;
}

err_ack = (dl_error_ack_t *)ctrl_area;

if(err_ack->dl_primitive != DL_HP_PPA_ACK)
{
bRet = AL_false;
goto _exit;
}

if(ppa_ack->dl_length == 0)
{
bRet = AL_false;
goto _exit;
}

nicinfoex->count = 0;
for ( i = 0; i < ppa_ack->dl_count; ++i )
{
if ( i == 0 )
{
ppa_info = (dl_hp_ppa_info_t *)((u_char *)ctrl_area + ppa_ack->dl_offset);
}
else
{
ppa_info = (dl_hp_ppa_info_t *)((u_char *)ctrl_area + ppa_ack->dl_offset + ppa_info->dl_next_offset);
}

ppa = ppa_info->dl_ppa;

if (ppa_info->dl_mac_type == DL_ETHER)
{
// Todo:
}
}

[Laurent Menase]

Just 1 remark,

You can get the DL_HP_PPA_ACK
with 2 getmsg()
the you call the first one to only get the dl_hppa_ack_t setting max_len to sizeof(dl_hppa_ack_t) on the first call
getmsg will return 1 which means MORECTL
then you can read infos/infos or all the info_acks. mallocing ppa_ack->dl_length bytes before the 2nd getmsg()setting max_len to ppa_ack->dl_length.
it will contains all the rest of the DL_HP_PPA_ACK which contains the ppa infos.

[jgobbur]

Is there other way to get by using the ioctl call with proper request?

[Laurent Menase]

with ioctl you can only get plumb interfaces - the same as netstat -ni output with a ioctl over a AF_INET/SOCK_RAW

[jgobbur]

do you know have any sample code. pls share with me.