100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#ifndef SIOCGIFCONF /* whatever works */
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#include <sys/sockio.h>
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#endif
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#include "hassalen.h"
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#include "byte.h"
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#include "ip.h"
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#include "ipalloc.h"
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#include "stralloc.h"
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#include "ipme.h"
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static int ipmeok = 0;
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ipalloc ipme = {0};
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int ipme_is(ip)
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struct ip_address *ip;
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{
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int i;
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if (ipme_init() != 1) return -1;
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for (i = 0;i < ipme.len;++i)
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if (byte_equal(&ipme.ix[i].ip,4,ip))
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return 1;
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return 0;
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}
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static stralloc buf = {0};
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int ipme_init()
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{
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struct ifconf ifc;
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char *x;
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struct ifreq *ifr;
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struct sockaddr_in *sin;
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int len;
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int s;
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struct ip_mx ix;
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if (ipmeok) return 1;
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if (!ipalloc_readyplus(&ipme,0)) return 0;
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ipme.len = 0;
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ix.pref = 0;
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/* 0.0.0.0 is a special address which always refers to
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* "this host, this network", according to RFC 1122, Sec. 3.2.1.3a.
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*/
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byte_copy(&ix.ip,4,"\0\0\0\0");
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if (!ipalloc_append(&ipme,&ix)) { return 0; }
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if ((s = socket(AF_INET,SOCK_STREAM,0)) == -1) return -1;
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len = 256;
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for (;;) {
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if (!stralloc_ready(&buf,len)) { close(s); return 0; }
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buf.len = 0;
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ifc.ifc_buf = buf.s;
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ifc.ifc_len = len;
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if (ioctl(s,SIOCGIFCONF,&ifc) >= 0) /* > is for System V */
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if (ifc.ifc_len + sizeof(*ifr) + 64 < len) { /* what a stupid interface */
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buf.len = ifc.ifc_len;
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break;
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}
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if (len > 200000) { close(s); return -1; }
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len += 100 + (len >> 2);
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}
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x = buf.s;
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while (x < buf.s + buf.len) {
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ifr = (struct ifreq *) x;
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#ifdef HASSALEN
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len = sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
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if (len < sizeof(*ifr))
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len = sizeof(*ifr);
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if (ifr->ifr_addr.sa_family == AF_INET) {
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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byte_copy(&ix.ip,4,&sin->sin_addr);
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if (ioctl(s,SIOCGIFFLAGS,x) == 0)
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if (ifr->ifr_flags & IFF_UP)
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if (!ipalloc_append(&ipme,&ix)) { close(s); return 0; }
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}
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#else
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len = sizeof(*ifr);
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if (ioctl(s,SIOCGIFFLAGS,x) == 0)
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if (ifr->ifr_flags & IFF_UP)
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if (ioctl(s,SIOCGIFADDR,x) == 0)
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if (ifr->ifr_addr.sa_family == AF_INET) {
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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byte_copy(&ix.ip,4,&sin->sin_addr);
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if (!ipalloc_append(&ipme,&ix)) { close(s); return 0; }
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}
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#endif
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x += len;
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}
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close(s);
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ipmeok = 1;
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return 1;
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}
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