SIOCGICONG doesn't work excatly the same on *BSD. You should use getifaddrs() whenever possible, it is said to be cleaner and easier to use. getifaddrs is available on Darwin, *BSD and recent Linux.

/ David

Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum wrote:

How portable is SIOCGIFCONF? Solaris 9 seems to consider it obsolete, and provides SIOCGLIFCONF as a replacement. And for W*ndows something else completely is probably needed.

Otherwise it seems ok, but it should of course return IPV6 addresses as well. Which makes the proposed API a bit awkward, since each interface may have two addresses, one V4 and one V6.

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-11 05:22: Subject: gethostip

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Parsing ifconfig output is boring, so something like this could perhaps be added? I'm not adding it myself, since network/socket/ioctl-stuff isn't my best area.

static void f_gethostip(INT32 args) { int fd, i, j, up; struct ifconf ifc; struct sockaddr_in addr; char buffer[ INTERFACES * sizeof( struct ifreq ) ];

pop_n_elems(args);

fd = fd_socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP ); if( fd < 0 ) Pike_error("gethostip: Failed to open socket.\n");

ifc.ifc_len = sizeof( buffer ); ifc.ifc_ifcu.ifcu_buf = (caddr_t)buffer; if( ioctl( fd, SIOCGIFCONF, &ifc ) < 0 ) Pike_error("gethostip: Query failed.\n");

up = 0; for( i=0; i<ifc.ifc_len; ) { struct ifreq *ifr = (struct ifreq *)( (caddr_t)ifc.ifc_req+i ); struct ifreq ifr2; i += sizeof(struct ifreq);

strcpy( ifr2.ifr_name, ifr->ifr_name ); if( ioctl( fd, SIOCGIFFLAGS, &ifr2 )<0 ) Pike_error("gethostip: Query failed.\n");

if( (ifr2.ifr_flags & IFF_LOOPBACK) || !(ifr2.ifr_flags & IFF_UP) || (ifr->ifr_addr.sa_family != AF_INET ) ) continue;

push_text( ifr->ifr_name ); memcpy( &addr, &ifr->ifr_addr, sizeof(ifr->ifr_addr) ); push_text( inet_ntoa( addr.sin_addr ) );

up++; } fd_close(fd); f_aggregate_mapping(up*2); }

/ Martin Nilsson (DivX Networks)

Well, the downside of that approach is that you need to always use x->ipv4 || x->ipv6 to be sure to get a valid address. Besides, Linux can assign several IPV6 addresses to the same interface (while Solaris instead creates a pseudo-interface for each additional address). Normally you have three V6 addresses for each interface, one link-local, one site-local and one global.

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-11 13:29: Subject: gethostip

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returning mapping(string:mapping(string:mixed)) is probaby better. Then every interface could have ipv4, ipv6, mac and whatever else is interesting. I'll wait and see if someone with more configure-skillz implements this first before I check anything in...

/ Martin Nilsson (DivX Networks)

Still, it seems a bit awkward to always have to do ({x->ipv4})+x->ipv6, why not just put all of them in an array?

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-11 23:39: Subject: gethostip

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Well, x->ip could always be one address and x->ipv6 could always be an array.

/ Martin Nilsson (DivX Networks)

Yes. Then for netmasks I suppose another array which matches positionally can be used (to loop over both, use Array.sum_arrays). I'm not sure what wold be the best way to represent a v6 netmask though. A string on the format "/64" perhaps?

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-11 23:57: Subject: gethostip

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..and name it x->ips

/ Martin Nilsson (DivX Networks)

one that is guaranteed to always give you just one ip,

x->ips[0]

one ip4 ip,

filter(x->ips, lambda(string x) { return has_value(x, "."); })[0]

all ip4 ips.

filter(x->ips, lambda(string x) { return has_value(x, "."); })

one ip6

filter(x->ips, lambda(string x) { return has_value(x, ":"); })[0]

all ip6

filter(x->ips, lambda(string x) { return has_value(x, ":"); })

all ips.

x->ips

Since you normally don't need to differentiate between v4 and v6, it's acceptable that you need to do slightly more work in the cases where you do.

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-12 00:06: Subject: Re: gethostip

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i guess you want all of that: one that is guaranteed to always give you just one ip, one ip4 ip, all ip4 ips. one ip6 all ip6 all ips.

greetings, martin.

/ Brevbäraren

Indeed.

/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)

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2004-09-12 00:14: Subject: Re: gethostip

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You can even skip the lambdas; filter(x->ips, has_value, ".")[0] et c.

/ Johan Sundström (Achtung Liebe!)